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 static 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 * @extack: extack point to fill failure reason 423 **/ 424 static int bond_ipsec_add_sa(struct xfrm_state *xs, 425 struct netlink_ext_ack *extack) 426 { 427 struct net_device *bond_dev = xs->xso.dev; 428 struct bond_ipsec *ipsec; 429 struct bonding *bond; 430 struct slave *slave; 431 int err; 432 433 if (!bond_dev) 434 return -EINVAL; 435 436 rcu_read_lock(); 437 bond = netdev_priv(bond_dev); 438 slave = rcu_dereference(bond->curr_active_slave); 439 if (!slave) { 440 rcu_read_unlock(); 441 return -ENODEV; 442 } 443 444 if (!slave->dev->xfrmdev_ops || 445 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 446 netif_is_bond_master(slave->dev)) { 447 NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload"); 448 rcu_read_unlock(); 449 return -EINVAL; 450 } 451 452 ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); 453 if (!ipsec) { 454 rcu_read_unlock(); 455 return -ENOMEM; 456 } 457 xs->xso.real_dev = slave->dev; 458 459 err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs, extack); 460 if (!err) { 461 ipsec->xs = xs; 462 INIT_LIST_HEAD(&ipsec->list); 463 spin_lock_bh(&bond->ipsec_lock); 464 list_add(&ipsec->list, &bond->ipsec_list); 465 spin_unlock_bh(&bond->ipsec_lock); 466 } else { 467 kfree(ipsec); 468 } 469 rcu_read_unlock(); 470 return err; 471 } 472 473 static void bond_ipsec_add_sa_all(struct bonding *bond) 474 { 475 struct net_device *bond_dev = bond->dev; 476 struct bond_ipsec *ipsec; 477 struct slave *slave; 478 479 rcu_read_lock(); 480 slave = rcu_dereference(bond->curr_active_slave); 481 if (!slave) 482 goto out; 483 484 if (!slave->dev->xfrmdev_ops || 485 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 486 netif_is_bond_master(slave->dev)) { 487 spin_lock_bh(&bond->ipsec_lock); 488 if (!list_empty(&bond->ipsec_list)) 489 slave_warn(bond_dev, slave->dev, 490 "%s: no slave xdo_dev_state_add\n", 491 __func__); 492 spin_unlock_bh(&bond->ipsec_lock); 493 goto out; 494 } 495 496 spin_lock_bh(&bond->ipsec_lock); 497 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 498 ipsec->xs->xso.real_dev = slave->dev; 499 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) { 500 slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); 501 ipsec->xs->xso.real_dev = NULL; 502 } 503 } 504 spin_unlock_bh(&bond->ipsec_lock); 505 out: 506 rcu_read_unlock(); 507 } 508 509 /** 510 * bond_ipsec_del_sa - clear out this specific SA 511 * @xs: pointer to transformer state struct 512 **/ 513 static void bond_ipsec_del_sa(struct xfrm_state *xs) 514 { 515 struct net_device *bond_dev = xs->xso.dev; 516 struct bond_ipsec *ipsec; 517 struct bonding *bond; 518 struct slave *slave; 519 520 if (!bond_dev) 521 return; 522 523 rcu_read_lock(); 524 bond = netdev_priv(bond_dev); 525 slave = rcu_dereference(bond->curr_active_slave); 526 527 if (!slave) 528 goto out; 529 530 if (!xs->xso.real_dev) 531 goto out; 532 533 WARN_ON(xs->xso.real_dev != slave->dev); 534 535 if (!slave->dev->xfrmdev_ops || 536 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 537 netif_is_bond_master(slave->dev)) { 538 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); 539 goto out; 540 } 541 542 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); 543 out: 544 spin_lock_bh(&bond->ipsec_lock); 545 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 546 if (ipsec->xs == xs) { 547 list_del(&ipsec->list); 548 kfree(ipsec); 549 break; 550 } 551 } 552 spin_unlock_bh(&bond->ipsec_lock); 553 rcu_read_unlock(); 554 } 555 556 static void bond_ipsec_del_sa_all(struct bonding *bond) 557 { 558 struct net_device *bond_dev = bond->dev; 559 struct bond_ipsec *ipsec; 560 struct slave *slave; 561 562 rcu_read_lock(); 563 slave = rcu_dereference(bond->curr_active_slave); 564 if (!slave) { 565 rcu_read_unlock(); 566 return; 567 } 568 569 spin_lock_bh(&bond->ipsec_lock); 570 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 571 if (!ipsec->xs->xso.real_dev) 572 continue; 573 574 if (!slave->dev->xfrmdev_ops || 575 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 576 netif_is_bond_master(slave->dev)) { 577 slave_warn(bond_dev, slave->dev, 578 "%s: no slave xdo_dev_state_delete\n", 579 __func__); 580 } else { 581 slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 582 } 583 ipsec->xs->xso.real_dev = NULL; 584 } 585 spin_unlock_bh(&bond->ipsec_lock); 586 rcu_read_unlock(); 587 } 588 589 /** 590 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 591 * @skb: current data packet 592 * @xs: pointer to transformer state struct 593 **/ 594 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 595 { 596 struct net_device *bond_dev = xs->xso.dev; 597 struct net_device *real_dev; 598 struct slave *curr_active; 599 struct bonding *bond; 600 int err; 601 602 bond = netdev_priv(bond_dev); 603 rcu_read_lock(); 604 curr_active = rcu_dereference(bond->curr_active_slave); 605 real_dev = curr_active->dev; 606 607 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 608 err = false; 609 goto out; 610 } 611 612 if (!xs->xso.real_dev) { 613 err = false; 614 goto out; 615 } 616 617 if (!real_dev->xfrmdev_ops || 618 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 619 netif_is_bond_master(real_dev)) { 620 err = false; 621 goto out; 622 } 623 624 err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 625 out: 626 rcu_read_unlock(); 627 return err; 628 } 629 630 static const struct xfrmdev_ops bond_xfrmdev_ops = { 631 .xdo_dev_state_add = bond_ipsec_add_sa, 632 .xdo_dev_state_delete = bond_ipsec_del_sa, 633 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 634 }; 635 #endif /* CONFIG_XFRM_OFFLOAD */ 636 637 /*------------------------------- Link status -------------------------------*/ 638 639 /* Set the carrier state for the master according to the state of its 640 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 641 * do special 802.3ad magic. 642 * 643 * Returns zero if carrier state does not change, nonzero if it does. 644 */ 645 int bond_set_carrier(struct bonding *bond) 646 { 647 struct list_head *iter; 648 struct slave *slave; 649 650 if (!bond_has_slaves(bond)) 651 goto down; 652 653 if (BOND_MODE(bond) == BOND_MODE_8023AD) 654 return bond_3ad_set_carrier(bond); 655 656 bond_for_each_slave(bond, slave, iter) { 657 if (slave->link == BOND_LINK_UP) { 658 if (!netif_carrier_ok(bond->dev)) { 659 netif_carrier_on(bond->dev); 660 return 1; 661 } 662 return 0; 663 } 664 } 665 666 down: 667 if (netif_carrier_ok(bond->dev)) { 668 netif_carrier_off(bond->dev); 669 return 1; 670 } 671 return 0; 672 } 673 674 /* Get link speed and duplex from the slave's base driver 675 * using ethtool. If for some reason the call fails or the 676 * values are invalid, set speed and duplex to -1, 677 * and return. Return 1 if speed or duplex settings are 678 * UNKNOWN; 0 otherwise. 679 */ 680 static int bond_update_speed_duplex(struct slave *slave) 681 { 682 struct net_device *slave_dev = slave->dev; 683 struct ethtool_link_ksettings ecmd; 684 int res; 685 686 slave->speed = SPEED_UNKNOWN; 687 slave->duplex = DUPLEX_UNKNOWN; 688 689 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 690 if (res < 0) 691 return 1; 692 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 693 return 1; 694 switch (ecmd.base.duplex) { 695 case DUPLEX_FULL: 696 case DUPLEX_HALF: 697 break; 698 default: 699 return 1; 700 } 701 702 slave->speed = ecmd.base.speed; 703 slave->duplex = ecmd.base.duplex; 704 705 return 0; 706 } 707 708 const char *bond_slave_link_status(s8 link) 709 { 710 switch (link) { 711 case BOND_LINK_UP: 712 return "up"; 713 case BOND_LINK_FAIL: 714 return "going down"; 715 case BOND_LINK_DOWN: 716 return "down"; 717 case BOND_LINK_BACK: 718 return "going back"; 719 default: 720 return "unknown"; 721 } 722 } 723 724 /* if <dev> supports MII link status reporting, check its link status. 725 * 726 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 727 * depending upon the setting of the use_carrier parameter. 728 * 729 * Return either BMSR_LSTATUS, meaning that the link is up (or we 730 * can't tell and just pretend it is), or 0, meaning that the link is 731 * down. 732 * 733 * If reporting is non-zero, instead of faking link up, return -1 if 734 * both ETHTOOL and MII ioctls fail (meaning the device does not 735 * support them). If use_carrier is set, return whatever it says. 736 * It'd be nice if there was a good way to tell if a driver supports 737 * netif_carrier, but there really isn't. 738 */ 739 static int bond_check_dev_link(struct bonding *bond, 740 struct net_device *slave_dev, int reporting) 741 { 742 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 743 int (*ioctl)(struct net_device *, struct ifreq *, int); 744 struct ifreq ifr; 745 struct mii_ioctl_data *mii; 746 747 if (!reporting && !netif_running(slave_dev)) 748 return 0; 749 750 if (bond->params.use_carrier) 751 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 752 753 /* Try to get link status using Ethtool first. */ 754 if (slave_dev->ethtool_ops->get_link) 755 return slave_dev->ethtool_ops->get_link(slave_dev) ? 756 BMSR_LSTATUS : 0; 757 758 /* Ethtool can't be used, fallback to MII ioctls. */ 759 ioctl = slave_ops->ndo_eth_ioctl; 760 if (ioctl) { 761 /* TODO: set pointer to correct ioctl on a per team member 762 * bases to make this more efficient. that is, once 763 * we determine the correct ioctl, we will always 764 * call it and not the others for that team 765 * member. 766 */ 767 768 /* We cannot assume that SIOCGMIIPHY will also read a 769 * register; not all network drivers (e.g., e100) 770 * support that. 771 */ 772 773 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 774 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 775 mii = if_mii(&ifr); 776 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 777 mii->reg_num = MII_BMSR; 778 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 779 return mii->val_out & BMSR_LSTATUS; 780 } 781 } 782 783 /* If reporting, report that either there's no ndo_eth_ioctl, 784 * or both SIOCGMIIREG and get_link failed (meaning that we 785 * cannot report link status). If not reporting, pretend 786 * we're ok. 787 */ 788 return reporting ? -1 : BMSR_LSTATUS; 789 } 790 791 /*----------------------------- Multicast list ------------------------------*/ 792 793 /* Push the promiscuity flag down to appropriate slaves */ 794 static int bond_set_promiscuity(struct bonding *bond, int inc) 795 { 796 struct list_head *iter; 797 int err = 0; 798 799 if (bond_uses_primary(bond)) { 800 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 801 802 if (curr_active) 803 err = dev_set_promiscuity(curr_active->dev, inc); 804 } else { 805 struct slave *slave; 806 807 bond_for_each_slave(bond, slave, iter) { 808 err = dev_set_promiscuity(slave->dev, inc); 809 if (err) 810 return err; 811 } 812 } 813 return err; 814 } 815 816 /* Push the allmulti flag down to all slaves */ 817 static int bond_set_allmulti(struct bonding *bond, int inc) 818 { 819 struct list_head *iter; 820 int err = 0; 821 822 if (bond_uses_primary(bond)) { 823 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 824 825 if (curr_active) 826 err = dev_set_allmulti(curr_active->dev, inc); 827 } else { 828 struct slave *slave; 829 830 bond_for_each_slave(bond, slave, iter) { 831 err = dev_set_allmulti(slave->dev, inc); 832 if (err) 833 return err; 834 } 835 } 836 return err; 837 } 838 839 /* Retrieve the list of registered multicast addresses for the bonding 840 * device and retransmit an IGMP JOIN request to the current active 841 * slave. 842 */ 843 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 844 { 845 struct bonding *bond = container_of(work, struct bonding, 846 mcast_work.work); 847 848 if (!rtnl_trylock()) { 849 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 850 return; 851 } 852 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 853 854 if (bond->igmp_retrans > 1) { 855 bond->igmp_retrans--; 856 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 857 } 858 rtnl_unlock(); 859 } 860 861 /* Flush bond's hardware addresses from slave */ 862 static void bond_hw_addr_flush(struct net_device *bond_dev, 863 struct net_device *slave_dev) 864 { 865 struct bonding *bond = netdev_priv(bond_dev); 866 867 dev_uc_unsync(slave_dev, bond_dev); 868 dev_mc_unsync(slave_dev, bond_dev); 869 870 if (BOND_MODE(bond) == BOND_MODE_8023AD) 871 dev_mc_del(slave_dev, lacpdu_mcast_addr); 872 } 873 874 /*--------------------------- Active slave change ---------------------------*/ 875 876 /* Update the hardware address list and promisc/allmulti for the new and 877 * old active slaves (if any). Modes that are not using primary keep all 878 * slaves up date at all times; only the modes that use primary need to call 879 * this function to swap these settings during a failover. 880 */ 881 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 882 struct slave *old_active) 883 { 884 if (old_active) { 885 if (bond->dev->flags & IFF_PROMISC) 886 dev_set_promiscuity(old_active->dev, -1); 887 888 if (bond->dev->flags & IFF_ALLMULTI) 889 dev_set_allmulti(old_active->dev, -1); 890 891 if (bond->dev->flags & IFF_UP) 892 bond_hw_addr_flush(bond->dev, old_active->dev); 893 } 894 895 if (new_active) { 896 /* FIXME: Signal errors upstream. */ 897 if (bond->dev->flags & IFF_PROMISC) 898 dev_set_promiscuity(new_active->dev, 1); 899 900 if (bond->dev->flags & IFF_ALLMULTI) 901 dev_set_allmulti(new_active->dev, 1); 902 903 if (bond->dev->flags & IFF_UP) { 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 /** 913 * bond_set_dev_addr - clone slave's address to bond 914 * @bond_dev: bond net device 915 * @slave_dev: slave net device 916 * 917 * Should be called with RTNL held. 918 */ 919 static int bond_set_dev_addr(struct net_device *bond_dev, 920 struct net_device *slave_dev) 921 { 922 int err; 923 924 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 925 bond_dev, slave_dev, slave_dev->addr_len); 926 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 927 if (err) 928 return err; 929 930 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 931 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 932 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 933 return 0; 934 } 935 936 static struct slave *bond_get_old_active(struct bonding *bond, 937 struct slave *new_active) 938 { 939 struct slave *slave; 940 struct list_head *iter; 941 942 bond_for_each_slave(bond, slave, iter) { 943 if (slave == new_active) 944 continue; 945 946 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 947 return slave; 948 } 949 950 return NULL; 951 } 952 953 /* bond_do_fail_over_mac 954 * 955 * Perform special MAC address swapping for fail_over_mac settings 956 * 957 * Called with RTNL 958 */ 959 static void bond_do_fail_over_mac(struct bonding *bond, 960 struct slave *new_active, 961 struct slave *old_active) 962 { 963 u8 tmp_mac[MAX_ADDR_LEN]; 964 struct sockaddr_storage ss; 965 int rv; 966 967 switch (bond->params.fail_over_mac) { 968 case BOND_FOM_ACTIVE: 969 if (new_active) { 970 rv = bond_set_dev_addr(bond->dev, new_active->dev); 971 if (rv) 972 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 973 -rv); 974 } 975 break; 976 case BOND_FOM_FOLLOW: 977 /* if new_active && old_active, swap them 978 * if just old_active, do nothing (going to no active slave) 979 * if just new_active, set new_active to bond's MAC 980 */ 981 if (!new_active) 982 return; 983 984 if (!old_active) 985 old_active = bond_get_old_active(bond, new_active); 986 987 if (old_active) { 988 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 989 new_active->dev->addr_len); 990 bond_hw_addr_copy(ss.__data, 991 old_active->dev->dev_addr, 992 old_active->dev->addr_len); 993 ss.ss_family = new_active->dev->type; 994 } else { 995 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 996 bond->dev->addr_len); 997 ss.ss_family = bond->dev->type; 998 } 999 1000 rv = dev_set_mac_address(new_active->dev, 1001 (struct sockaddr *)&ss, NULL); 1002 if (rv) { 1003 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1004 -rv); 1005 goto out; 1006 } 1007 1008 if (!old_active) 1009 goto out; 1010 1011 bond_hw_addr_copy(ss.__data, tmp_mac, 1012 new_active->dev->addr_len); 1013 ss.ss_family = old_active->dev->type; 1014 1015 rv = dev_set_mac_address(old_active->dev, 1016 (struct sockaddr *)&ss, NULL); 1017 if (rv) 1018 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1019 -rv); 1020 out: 1021 break; 1022 default: 1023 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1024 bond->params.fail_over_mac); 1025 break; 1026 } 1027 1028 } 1029 1030 /** 1031 * bond_choose_primary_or_current - select the primary or high priority slave 1032 * @bond: our bonding struct 1033 * 1034 * - Check if there is a primary link. If the primary link was set and is up, 1035 * go on and do link reselection. 1036 * 1037 * - If primary link is not set or down, find the highest priority link. 1038 * If the highest priority link is not current slave, set it as primary 1039 * link and do link reselection. 1040 */ 1041 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1042 { 1043 struct slave *prim = rtnl_dereference(bond->primary_slave); 1044 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1045 struct slave *slave, *hprio = NULL; 1046 struct list_head *iter; 1047 1048 if (!prim || prim->link != BOND_LINK_UP) { 1049 bond_for_each_slave(bond, slave, iter) { 1050 if (slave->link == BOND_LINK_UP) { 1051 hprio = hprio ?: slave; 1052 if (slave->prio > hprio->prio) 1053 hprio = slave; 1054 } 1055 } 1056 1057 if (hprio && hprio != curr) { 1058 prim = hprio; 1059 goto link_reselect; 1060 } 1061 1062 if (!curr || curr->link != BOND_LINK_UP) 1063 return NULL; 1064 return curr; 1065 } 1066 1067 if (bond->force_primary) { 1068 bond->force_primary = false; 1069 return prim; 1070 } 1071 1072 link_reselect: 1073 if (!curr || curr->link != BOND_LINK_UP) 1074 return prim; 1075 1076 /* At this point, prim and curr are both up */ 1077 switch (bond->params.primary_reselect) { 1078 case BOND_PRI_RESELECT_ALWAYS: 1079 return prim; 1080 case BOND_PRI_RESELECT_BETTER: 1081 if (prim->speed < curr->speed) 1082 return curr; 1083 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1084 return curr; 1085 return prim; 1086 case BOND_PRI_RESELECT_FAILURE: 1087 return curr; 1088 default: 1089 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1090 bond->params.primary_reselect); 1091 return curr; 1092 } 1093 } 1094 1095 /** 1096 * bond_find_best_slave - select the best available slave to be the active one 1097 * @bond: our bonding struct 1098 */ 1099 static struct slave *bond_find_best_slave(struct bonding *bond) 1100 { 1101 struct slave *slave, *bestslave = NULL; 1102 struct list_head *iter; 1103 int mintime = bond->params.updelay; 1104 1105 slave = bond_choose_primary_or_current(bond); 1106 if (slave) 1107 return slave; 1108 1109 bond_for_each_slave(bond, slave, iter) { 1110 if (slave->link == BOND_LINK_UP) 1111 return slave; 1112 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1113 slave->delay < mintime) { 1114 mintime = slave->delay; 1115 bestslave = slave; 1116 } 1117 } 1118 1119 return bestslave; 1120 } 1121 1122 static bool bond_should_notify_peers(struct bonding *bond) 1123 { 1124 struct slave *slave; 1125 1126 rcu_read_lock(); 1127 slave = rcu_dereference(bond->curr_active_slave); 1128 rcu_read_unlock(); 1129 1130 if (!slave || !bond->send_peer_notif || 1131 bond->send_peer_notif % 1132 max(1, bond->params.peer_notif_delay) != 0 || 1133 !netif_carrier_ok(bond->dev) || 1134 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1135 return false; 1136 1137 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1138 slave ? slave->dev->name : "NULL"); 1139 1140 return true; 1141 } 1142 1143 /** 1144 * bond_change_active_slave - change the active slave into the specified one 1145 * @bond: our bonding struct 1146 * @new_active: the new slave to make the active one 1147 * 1148 * Set the new slave to the bond's settings and unset them on the old 1149 * curr_active_slave. 1150 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1151 * 1152 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1153 * because it is apparently the best available slave we have, even though its 1154 * updelay hasn't timed out yet. 1155 * 1156 * Caller must hold RTNL. 1157 */ 1158 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1159 { 1160 struct slave *old_active; 1161 1162 ASSERT_RTNL(); 1163 1164 old_active = rtnl_dereference(bond->curr_active_slave); 1165 1166 if (old_active == new_active) 1167 return; 1168 1169 #ifdef CONFIG_XFRM_OFFLOAD 1170 bond_ipsec_del_sa_all(bond); 1171 #endif /* CONFIG_XFRM_OFFLOAD */ 1172 1173 if (new_active) { 1174 new_active->last_link_up = jiffies; 1175 1176 if (new_active->link == BOND_LINK_BACK) { 1177 if (bond_uses_primary(bond)) { 1178 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1179 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1180 } 1181 1182 new_active->delay = 0; 1183 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1184 BOND_SLAVE_NOTIFY_NOW); 1185 1186 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1187 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1188 1189 if (bond_is_lb(bond)) 1190 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1191 } else { 1192 if (bond_uses_primary(bond)) 1193 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1194 } 1195 } 1196 1197 if (bond_uses_primary(bond)) 1198 bond_hw_addr_swap(bond, new_active, old_active); 1199 1200 if (bond_is_lb(bond)) { 1201 bond_alb_handle_active_change(bond, new_active); 1202 if (old_active) 1203 bond_set_slave_inactive_flags(old_active, 1204 BOND_SLAVE_NOTIFY_NOW); 1205 if (new_active) 1206 bond_set_slave_active_flags(new_active, 1207 BOND_SLAVE_NOTIFY_NOW); 1208 } else { 1209 rcu_assign_pointer(bond->curr_active_slave, new_active); 1210 } 1211 1212 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1213 if (old_active) 1214 bond_set_slave_inactive_flags(old_active, 1215 BOND_SLAVE_NOTIFY_NOW); 1216 1217 if (new_active) { 1218 bool should_notify_peers = false; 1219 1220 bond_set_slave_active_flags(new_active, 1221 BOND_SLAVE_NOTIFY_NOW); 1222 1223 if (bond->params.fail_over_mac) 1224 bond_do_fail_over_mac(bond, new_active, 1225 old_active); 1226 1227 if (netif_running(bond->dev)) { 1228 bond->send_peer_notif = 1229 bond->params.num_peer_notif * 1230 max(1, bond->params.peer_notif_delay); 1231 should_notify_peers = 1232 bond_should_notify_peers(bond); 1233 } 1234 1235 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1236 if (should_notify_peers) { 1237 bond->send_peer_notif--; 1238 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1239 bond->dev); 1240 } 1241 } 1242 } 1243 1244 #ifdef CONFIG_XFRM_OFFLOAD 1245 bond_ipsec_add_sa_all(bond); 1246 #endif /* CONFIG_XFRM_OFFLOAD */ 1247 1248 /* resend IGMP joins since active slave has changed or 1249 * all were sent on curr_active_slave. 1250 * resend only if bond is brought up with the affected 1251 * bonding modes and the retransmission is enabled 1252 */ 1253 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1254 ((bond_uses_primary(bond) && new_active) || 1255 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1256 bond->igmp_retrans = bond->params.resend_igmp; 1257 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1258 } 1259 } 1260 1261 /** 1262 * bond_select_active_slave - select a new active slave, if needed 1263 * @bond: our bonding struct 1264 * 1265 * This functions should be called when one of the following occurs: 1266 * - The old curr_active_slave has been released or lost its link. 1267 * - The primary_slave has got its link back. 1268 * - A slave has got its link back and there's no old curr_active_slave. 1269 * 1270 * Caller must hold RTNL. 1271 */ 1272 void bond_select_active_slave(struct bonding *bond) 1273 { 1274 struct slave *best_slave; 1275 int rv; 1276 1277 ASSERT_RTNL(); 1278 1279 best_slave = bond_find_best_slave(bond); 1280 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1281 bond_change_active_slave(bond, best_slave); 1282 rv = bond_set_carrier(bond); 1283 if (!rv) 1284 return; 1285 1286 if (netif_carrier_ok(bond->dev)) 1287 netdev_info(bond->dev, "active interface up!\n"); 1288 else 1289 netdev_info(bond->dev, "now running without any active interface!\n"); 1290 } 1291 } 1292 1293 #ifdef CONFIG_NET_POLL_CONTROLLER 1294 static inline int slave_enable_netpoll(struct slave *slave) 1295 { 1296 struct netpoll *np; 1297 int err = 0; 1298 1299 np = kzalloc(sizeof(*np), GFP_KERNEL); 1300 err = -ENOMEM; 1301 if (!np) 1302 goto out; 1303 1304 err = __netpoll_setup(np, slave->dev); 1305 if (err) { 1306 kfree(np); 1307 goto out; 1308 } 1309 slave->np = np; 1310 out: 1311 return err; 1312 } 1313 static inline void slave_disable_netpoll(struct slave *slave) 1314 { 1315 struct netpoll *np = slave->np; 1316 1317 if (!np) 1318 return; 1319 1320 slave->np = NULL; 1321 1322 __netpoll_free(np); 1323 } 1324 1325 static void bond_poll_controller(struct net_device *bond_dev) 1326 { 1327 struct bonding *bond = netdev_priv(bond_dev); 1328 struct slave *slave = NULL; 1329 struct list_head *iter; 1330 struct ad_info ad_info; 1331 1332 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1333 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1334 return; 1335 1336 bond_for_each_slave_rcu(bond, slave, iter) { 1337 if (!bond_slave_is_up(slave)) 1338 continue; 1339 1340 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1341 struct aggregator *agg = 1342 SLAVE_AD_INFO(slave)->port.aggregator; 1343 1344 if (agg && 1345 agg->aggregator_identifier != ad_info.aggregator_id) 1346 continue; 1347 } 1348 1349 netpoll_poll_dev(slave->dev); 1350 } 1351 } 1352 1353 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1354 { 1355 struct bonding *bond = netdev_priv(bond_dev); 1356 struct list_head *iter; 1357 struct slave *slave; 1358 1359 bond_for_each_slave(bond, slave, iter) 1360 if (bond_slave_is_up(slave)) 1361 slave_disable_netpoll(slave); 1362 } 1363 1364 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1365 { 1366 struct bonding *bond = netdev_priv(dev); 1367 struct list_head *iter; 1368 struct slave *slave; 1369 int err = 0; 1370 1371 bond_for_each_slave(bond, slave, iter) { 1372 err = slave_enable_netpoll(slave); 1373 if (err) { 1374 bond_netpoll_cleanup(dev); 1375 break; 1376 } 1377 } 1378 return err; 1379 } 1380 #else 1381 static inline int slave_enable_netpoll(struct slave *slave) 1382 { 1383 return 0; 1384 } 1385 static inline void slave_disable_netpoll(struct slave *slave) 1386 { 1387 } 1388 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1389 { 1390 } 1391 #endif 1392 1393 /*---------------------------------- IOCTL ----------------------------------*/ 1394 1395 static netdev_features_t bond_fix_features(struct net_device *dev, 1396 netdev_features_t features) 1397 { 1398 struct bonding *bond = netdev_priv(dev); 1399 struct list_head *iter; 1400 netdev_features_t mask; 1401 struct slave *slave; 1402 1403 mask = features; 1404 1405 features &= ~NETIF_F_ONE_FOR_ALL; 1406 features |= NETIF_F_ALL_FOR_ALL; 1407 1408 bond_for_each_slave(bond, slave, iter) { 1409 features = netdev_increment_features(features, 1410 slave->dev->features, 1411 mask); 1412 } 1413 features = netdev_add_tso_features(features, mask); 1414 1415 return features; 1416 } 1417 1418 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1419 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1420 NETIF_F_HIGHDMA | NETIF_F_LRO) 1421 1422 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1423 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1424 1425 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1426 NETIF_F_GSO_SOFTWARE) 1427 1428 1429 static void bond_compute_features(struct bonding *bond) 1430 { 1431 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1432 IFF_XMIT_DST_RELEASE_PERM; 1433 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1434 netdev_features_t enc_features = BOND_ENC_FEATURES; 1435 #ifdef CONFIG_XFRM_OFFLOAD 1436 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1437 #endif /* CONFIG_XFRM_OFFLOAD */ 1438 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1439 struct net_device *bond_dev = bond->dev; 1440 struct list_head *iter; 1441 struct slave *slave; 1442 unsigned short max_hard_header_len = ETH_HLEN; 1443 unsigned int tso_max_size = TSO_MAX_SIZE; 1444 u16 tso_max_segs = TSO_MAX_SEGS; 1445 1446 if (!bond_has_slaves(bond)) 1447 goto done; 1448 vlan_features &= NETIF_F_ALL_FOR_ALL; 1449 mpls_features &= NETIF_F_ALL_FOR_ALL; 1450 1451 bond_for_each_slave(bond, slave, iter) { 1452 vlan_features = netdev_increment_features(vlan_features, 1453 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1454 1455 enc_features = netdev_increment_features(enc_features, 1456 slave->dev->hw_enc_features, 1457 BOND_ENC_FEATURES); 1458 1459 #ifdef CONFIG_XFRM_OFFLOAD 1460 xfrm_features = netdev_increment_features(xfrm_features, 1461 slave->dev->hw_enc_features, 1462 BOND_XFRM_FEATURES); 1463 #endif /* CONFIG_XFRM_OFFLOAD */ 1464 1465 mpls_features = netdev_increment_features(mpls_features, 1466 slave->dev->mpls_features, 1467 BOND_MPLS_FEATURES); 1468 1469 dst_release_flag &= slave->dev->priv_flags; 1470 if (slave->dev->hard_header_len > max_hard_header_len) 1471 max_hard_header_len = slave->dev->hard_header_len; 1472 1473 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1474 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1475 } 1476 bond_dev->hard_header_len = max_hard_header_len; 1477 1478 done: 1479 bond_dev->vlan_features = vlan_features; 1480 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1481 NETIF_F_HW_VLAN_CTAG_TX | 1482 NETIF_F_HW_VLAN_STAG_TX; 1483 #ifdef CONFIG_XFRM_OFFLOAD 1484 bond_dev->hw_enc_features |= xfrm_features; 1485 #endif /* CONFIG_XFRM_OFFLOAD */ 1486 bond_dev->mpls_features = mpls_features; 1487 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1488 netif_set_tso_max_size(bond_dev, tso_max_size); 1489 1490 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1491 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1492 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1493 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1494 1495 netdev_change_features(bond_dev); 1496 } 1497 1498 static void bond_setup_by_slave(struct net_device *bond_dev, 1499 struct net_device *slave_dev) 1500 { 1501 bond_dev->header_ops = slave_dev->header_ops; 1502 1503 bond_dev->type = slave_dev->type; 1504 bond_dev->hard_header_len = slave_dev->hard_header_len; 1505 bond_dev->needed_headroom = slave_dev->needed_headroom; 1506 bond_dev->addr_len = slave_dev->addr_len; 1507 1508 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1509 slave_dev->addr_len); 1510 } 1511 1512 /* On bonding slaves other than the currently active slave, suppress 1513 * duplicates except for alb non-mcast/bcast. 1514 */ 1515 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1516 struct slave *slave, 1517 struct bonding *bond) 1518 { 1519 if (bond_is_slave_inactive(slave)) { 1520 if (BOND_MODE(bond) == BOND_MODE_ALB && 1521 skb->pkt_type != PACKET_BROADCAST && 1522 skb->pkt_type != PACKET_MULTICAST) 1523 return false; 1524 return true; 1525 } 1526 return false; 1527 } 1528 1529 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1530 { 1531 struct sk_buff *skb = *pskb; 1532 struct slave *slave; 1533 struct bonding *bond; 1534 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1535 struct slave *); 1536 int ret = RX_HANDLER_ANOTHER; 1537 1538 skb = skb_share_check(skb, GFP_ATOMIC); 1539 if (unlikely(!skb)) 1540 return RX_HANDLER_CONSUMED; 1541 1542 *pskb = skb; 1543 1544 slave = bond_slave_get_rcu(skb->dev); 1545 bond = slave->bond; 1546 1547 recv_probe = READ_ONCE(bond->recv_probe); 1548 if (recv_probe) { 1549 ret = recv_probe(skb, bond, slave); 1550 if (ret == RX_HANDLER_CONSUMED) { 1551 consume_skb(skb); 1552 return ret; 1553 } 1554 } 1555 1556 /* 1557 * For packets determined by bond_should_deliver_exact_match() call to 1558 * be suppressed we want to make an exception for link-local packets. 1559 * This is necessary for e.g. LLDP daemons to be able to monitor 1560 * inactive slave links without being forced to bind to them 1561 * explicitly. 1562 * 1563 * At the same time, packets that are passed to the bonding master 1564 * (including link-local ones) can have their originating interface 1565 * determined via PACKET_ORIGDEV socket option. 1566 */ 1567 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1568 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1569 return RX_HANDLER_PASS; 1570 return RX_HANDLER_EXACT; 1571 } 1572 1573 skb->dev = bond->dev; 1574 1575 if (BOND_MODE(bond) == BOND_MODE_ALB && 1576 netif_is_bridge_port(bond->dev) && 1577 skb->pkt_type == PACKET_HOST) { 1578 1579 if (unlikely(skb_cow_head(skb, 1580 skb->data - skb_mac_header(skb)))) { 1581 kfree_skb(skb); 1582 return RX_HANDLER_CONSUMED; 1583 } 1584 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1585 bond->dev->addr_len); 1586 } 1587 1588 return ret; 1589 } 1590 1591 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1592 { 1593 switch (BOND_MODE(bond)) { 1594 case BOND_MODE_ROUNDROBIN: 1595 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1596 case BOND_MODE_ACTIVEBACKUP: 1597 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1598 case BOND_MODE_BROADCAST: 1599 return NETDEV_LAG_TX_TYPE_BROADCAST; 1600 case BOND_MODE_XOR: 1601 case BOND_MODE_8023AD: 1602 return NETDEV_LAG_TX_TYPE_HASH; 1603 default: 1604 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1605 } 1606 } 1607 1608 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1609 enum netdev_lag_tx_type type) 1610 { 1611 if (type != NETDEV_LAG_TX_TYPE_HASH) 1612 return NETDEV_LAG_HASH_NONE; 1613 1614 switch (bond->params.xmit_policy) { 1615 case BOND_XMIT_POLICY_LAYER2: 1616 return NETDEV_LAG_HASH_L2; 1617 case BOND_XMIT_POLICY_LAYER34: 1618 return NETDEV_LAG_HASH_L34; 1619 case BOND_XMIT_POLICY_LAYER23: 1620 return NETDEV_LAG_HASH_L23; 1621 case BOND_XMIT_POLICY_ENCAP23: 1622 return NETDEV_LAG_HASH_E23; 1623 case BOND_XMIT_POLICY_ENCAP34: 1624 return NETDEV_LAG_HASH_E34; 1625 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1626 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1627 default: 1628 return NETDEV_LAG_HASH_UNKNOWN; 1629 } 1630 } 1631 1632 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1633 struct netlink_ext_ack *extack) 1634 { 1635 struct netdev_lag_upper_info lag_upper_info; 1636 enum netdev_lag_tx_type type; 1637 int err; 1638 1639 type = bond_lag_tx_type(bond); 1640 lag_upper_info.tx_type = type; 1641 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1642 1643 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1644 &lag_upper_info, extack); 1645 if (err) 1646 return err; 1647 1648 slave->dev->flags |= IFF_SLAVE; 1649 return 0; 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 /* The bonding driver uses ether_setup() to convert a master bond device 1779 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always 1780 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP 1781 * if they were set 1782 */ 1783 static void bond_ether_setup(struct net_device *bond_dev) 1784 { 1785 unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP); 1786 1787 ether_setup(bond_dev); 1788 bond_dev->flags |= IFF_MASTER | flags; 1789 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1790 } 1791 1792 void bond_xdp_set_features(struct net_device *bond_dev) 1793 { 1794 struct bonding *bond = netdev_priv(bond_dev); 1795 xdp_features_t val = NETDEV_XDP_ACT_MASK; 1796 struct list_head *iter; 1797 struct slave *slave; 1798 1799 ASSERT_RTNL(); 1800 1801 if (!bond_xdp_check(bond)) { 1802 xdp_clear_features_flag(bond_dev); 1803 return; 1804 } 1805 1806 bond_for_each_slave(bond, slave, iter) 1807 val &= slave->dev->xdp_features; 1808 1809 xdp_set_features_flag(bond_dev, val); 1810 } 1811 1812 /* enslave device <slave> to bond device <master> */ 1813 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1814 struct netlink_ext_ack *extack) 1815 { 1816 struct bonding *bond = netdev_priv(bond_dev); 1817 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1818 struct slave *new_slave = NULL, *prev_slave; 1819 struct sockaddr_storage ss; 1820 int link_reporting; 1821 int res = 0, i; 1822 1823 if (slave_dev->flags & IFF_MASTER && 1824 !netif_is_bond_master(slave_dev)) { 1825 BOND_NL_ERR(bond_dev, extack, 1826 "Device type (master device) cannot be enslaved"); 1827 return -EPERM; 1828 } 1829 1830 if (!bond->params.use_carrier && 1831 slave_dev->ethtool_ops->get_link == NULL && 1832 slave_ops->ndo_eth_ioctl == NULL) { 1833 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1834 } 1835 1836 /* already in-use? */ 1837 if (netdev_is_rx_handler_busy(slave_dev)) { 1838 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1839 "Device is in use and cannot be enslaved"); 1840 return -EBUSY; 1841 } 1842 1843 if (bond_dev == slave_dev) { 1844 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1845 return -EPERM; 1846 } 1847 1848 /* vlan challenged mutual exclusion */ 1849 /* no need to lock since we're protected by rtnl_lock */ 1850 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1851 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1852 if (vlan_uses_dev(bond_dev)) { 1853 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1854 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1855 return -EPERM; 1856 } else { 1857 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1858 } 1859 } else { 1860 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1861 } 1862 1863 if (slave_dev->features & NETIF_F_HW_ESP) 1864 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1865 1866 /* Old ifenslave binaries are no longer supported. These can 1867 * be identified with moderate accuracy by the state of the slave: 1868 * the current ifenslave will set the interface down prior to 1869 * enslaving it; the old ifenslave will not. 1870 */ 1871 if (slave_dev->flags & IFF_UP) { 1872 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1873 "Device can not be enslaved while up"); 1874 return -EPERM; 1875 } 1876 1877 /* set bonding device ether type by slave - bonding netdevices are 1878 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1879 * there is a need to override some of the type dependent attribs/funcs. 1880 * 1881 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1882 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1883 */ 1884 if (!bond_has_slaves(bond)) { 1885 if (bond_dev->type != slave_dev->type) { 1886 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1887 bond_dev->type, slave_dev->type); 1888 1889 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1890 bond_dev); 1891 res = notifier_to_errno(res); 1892 if (res) { 1893 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1894 return -EBUSY; 1895 } 1896 1897 /* Flush unicast and multicast addresses */ 1898 dev_uc_flush(bond_dev); 1899 dev_mc_flush(bond_dev); 1900 1901 if (slave_dev->type != ARPHRD_ETHER) 1902 bond_setup_by_slave(bond_dev, slave_dev); 1903 else 1904 bond_ether_setup(bond_dev); 1905 1906 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1907 bond_dev); 1908 } 1909 } else if (bond_dev->type != slave_dev->type) { 1910 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1911 "Device type is different from other slaves"); 1912 return -EINVAL; 1913 } 1914 1915 if (slave_dev->type == ARPHRD_INFINIBAND && 1916 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1917 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1918 "Only active-backup mode is supported for infiniband slaves"); 1919 res = -EOPNOTSUPP; 1920 goto err_undo_flags; 1921 } 1922 1923 if (!slave_ops->ndo_set_mac_address || 1924 slave_dev->type == ARPHRD_INFINIBAND) { 1925 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1926 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1927 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1928 if (!bond_has_slaves(bond)) { 1929 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1930 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1931 } else { 1932 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1933 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1934 res = -EOPNOTSUPP; 1935 goto err_undo_flags; 1936 } 1937 } 1938 } 1939 1940 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1941 1942 /* If this is the first slave, then we need to set the master's hardware 1943 * address to be the same as the slave's. 1944 */ 1945 if (!bond_has_slaves(bond) && 1946 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1947 res = bond_set_dev_addr(bond->dev, slave_dev); 1948 if (res) 1949 goto err_undo_flags; 1950 } 1951 1952 new_slave = bond_alloc_slave(bond, slave_dev); 1953 if (!new_slave) { 1954 res = -ENOMEM; 1955 goto err_undo_flags; 1956 } 1957 1958 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1959 * is set via sysfs or module option if desired. 1960 */ 1961 new_slave->queue_id = 0; 1962 1963 /* Save slave's original mtu and then set it to match the bond */ 1964 new_slave->original_mtu = slave_dev->mtu; 1965 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1966 if (res) { 1967 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1968 goto err_free; 1969 } 1970 1971 /* Save slave's original ("permanent") mac address for modes 1972 * that need it, and for restoring it upon release, and then 1973 * set it to the master's address 1974 */ 1975 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1976 slave_dev->addr_len); 1977 1978 if (!bond->params.fail_over_mac || 1979 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1980 /* Set slave to master's mac address. The application already 1981 * set the master's mac address to that of the first slave 1982 */ 1983 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1984 ss.ss_family = slave_dev->type; 1985 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1986 extack); 1987 if (res) { 1988 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1989 goto err_restore_mtu; 1990 } 1991 } 1992 1993 /* set no_addrconf flag before open to prevent IPv6 addrconf */ 1994 slave_dev->priv_flags |= IFF_NO_ADDRCONF; 1995 1996 /* open the slave since the application closed it */ 1997 res = dev_open(slave_dev, extack); 1998 if (res) { 1999 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 2000 goto err_restore_mac; 2001 } 2002 2003 slave_dev->priv_flags |= IFF_BONDING; 2004 /* initialize slave stats */ 2005 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 2006 2007 if (bond_is_lb(bond)) { 2008 /* bond_alb_init_slave() must be called before all other stages since 2009 * it might fail and we do not want to have to undo everything 2010 */ 2011 res = bond_alb_init_slave(bond, new_slave); 2012 if (res) 2013 goto err_close; 2014 } 2015 2016 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 2017 if (res) { 2018 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 2019 goto err_close; 2020 } 2021 2022 prev_slave = bond_last_slave(bond); 2023 2024 new_slave->delay = 0; 2025 new_slave->link_failure_count = 0; 2026 2027 if (bond_update_speed_duplex(new_slave) && 2028 bond_needs_speed_duplex(bond)) 2029 new_slave->link = BOND_LINK_DOWN; 2030 2031 new_slave->last_rx = jiffies - 2032 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2033 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2034 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2035 2036 new_slave->last_tx = new_slave->last_rx; 2037 2038 if (bond->params.miimon && !bond->params.use_carrier) { 2039 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2040 2041 if ((link_reporting == -1) && !bond->params.arp_interval) { 2042 /* miimon is set but a bonded network driver 2043 * does not support ETHTOOL/MII and 2044 * arp_interval is not set. Note: if 2045 * use_carrier is enabled, we will never go 2046 * here (because netif_carrier is always 2047 * supported); thus, we don't need to change 2048 * the messages for netif_carrier. 2049 */ 2050 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"); 2051 } else if (link_reporting == -1) { 2052 /* unable get link status using mii/ethtool */ 2053 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"); 2054 } 2055 } 2056 2057 /* check for initial state */ 2058 new_slave->link = BOND_LINK_NOCHANGE; 2059 if (bond->params.miimon) { 2060 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2061 if (bond->params.updelay) { 2062 bond_set_slave_link_state(new_slave, 2063 BOND_LINK_BACK, 2064 BOND_SLAVE_NOTIFY_NOW); 2065 new_slave->delay = bond->params.updelay; 2066 } else { 2067 bond_set_slave_link_state(new_slave, 2068 BOND_LINK_UP, 2069 BOND_SLAVE_NOTIFY_NOW); 2070 } 2071 } else { 2072 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2073 BOND_SLAVE_NOTIFY_NOW); 2074 } 2075 } else if (bond->params.arp_interval) { 2076 bond_set_slave_link_state(new_slave, 2077 (netif_carrier_ok(slave_dev) ? 2078 BOND_LINK_UP : BOND_LINK_DOWN), 2079 BOND_SLAVE_NOTIFY_NOW); 2080 } else { 2081 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2082 BOND_SLAVE_NOTIFY_NOW); 2083 } 2084 2085 if (new_slave->link != BOND_LINK_DOWN) 2086 new_slave->last_link_up = jiffies; 2087 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2088 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2089 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2090 2091 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2092 /* if there is a primary slave, remember it */ 2093 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2094 rcu_assign_pointer(bond->primary_slave, new_slave); 2095 bond->force_primary = true; 2096 } 2097 } 2098 2099 switch (BOND_MODE(bond)) { 2100 case BOND_MODE_ACTIVEBACKUP: 2101 bond_set_slave_inactive_flags(new_slave, 2102 BOND_SLAVE_NOTIFY_NOW); 2103 break; 2104 case BOND_MODE_8023AD: 2105 /* in 802.3ad mode, the internal mechanism 2106 * will activate the slaves in the selected 2107 * aggregator 2108 */ 2109 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2110 /* if this is the first slave */ 2111 if (!prev_slave) { 2112 SLAVE_AD_INFO(new_slave)->id = 1; 2113 /* Initialize AD with the number of times that the AD timer is called in 1 second 2114 * can be called only after the mac address of the bond is set 2115 */ 2116 bond_3ad_initialize(bond); 2117 } else { 2118 SLAVE_AD_INFO(new_slave)->id = 2119 SLAVE_AD_INFO(prev_slave)->id + 1; 2120 } 2121 2122 bond_3ad_bind_slave(new_slave); 2123 break; 2124 case BOND_MODE_TLB: 2125 case BOND_MODE_ALB: 2126 bond_set_active_slave(new_slave); 2127 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2128 break; 2129 default: 2130 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2131 2132 /* always active in trunk mode */ 2133 bond_set_active_slave(new_slave); 2134 2135 /* In trunking mode there is little meaning to curr_active_slave 2136 * anyway (it holds no special properties of the bond device), 2137 * so we can change it without calling change_active_interface() 2138 */ 2139 if (!rcu_access_pointer(bond->curr_active_slave) && 2140 new_slave->link == BOND_LINK_UP) 2141 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2142 2143 break; 2144 } /* switch(bond_mode) */ 2145 2146 #ifdef CONFIG_NET_POLL_CONTROLLER 2147 if (bond->dev->npinfo) { 2148 if (slave_enable_netpoll(new_slave)) { 2149 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2150 res = -EBUSY; 2151 goto err_detach; 2152 } 2153 } 2154 #endif 2155 2156 if (!(bond_dev->features & NETIF_F_LRO)) 2157 dev_disable_lro(slave_dev); 2158 2159 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2160 new_slave); 2161 if (res) { 2162 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2163 goto err_detach; 2164 } 2165 2166 res = bond_master_upper_dev_link(bond, new_slave, extack); 2167 if (res) { 2168 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2169 goto err_unregister; 2170 } 2171 2172 bond_lower_state_changed(new_slave); 2173 2174 res = bond_sysfs_slave_add(new_slave); 2175 if (res) { 2176 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2177 goto err_upper_unlink; 2178 } 2179 2180 /* If the mode uses primary, then the following is handled by 2181 * bond_change_active_slave(). 2182 */ 2183 if (!bond_uses_primary(bond)) { 2184 /* set promiscuity level to new slave */ 2185 if (bond_dev->flags & IFF_PROMISC) { 2186 res = dev_set_promiscuity(slave_dev, 1); 2187 if (res) 2188 goto err_sysfs_del; 2189 } 2190 2191 /* set allmulti level to new slave */ 2192 if (bond_dev->flags & IFF_ALLMULTI) { 2193 res = dev_set_allmulti(slave_dev, 1); 2194 if (res) { 2195 if (bond_dev->flags & IFF_PROMISC) 2196 dev_set_promiscuity(slave_dev, -1); 2197 goto err_sysfs_del; 2198 } 2199 } 2200 2201 if (bond_dev->flags & IFF_UP) { 2202 netif_addr_lock_bh(bond_dev); 2203 dev_mc_sync_multiple(slave_dev, bond_dev); 2204 dev_uc_sync_multiple(slave_dev, bond_dev); 2205 netif_addr_unlock_bh(bond_dev); 2206 2207 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2208 dev_mc_add(slave_dev, lacpdu_mcast_addr); 2209 } 2210 } 2211 2212 bond->slave_cnt++; 2213 bond_compute_features(bond); 2214 bond_set_carrier(bond); 2215 2216 if (bond_uses_primary(bond)) { 2217 block_netpoll_tx(); 2218 bond_select_active_slave(bond); 2219 unblock_netpoll_tx(); 2220 } 2221 2222 if (bond_mode_can_use_xmit_hash(bond)) 2223 bond_update_slave_arr(bond, NULL); 2224 2225 2226 if (!slave_dev->netdev_ops->ndo_bpf || 2227 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2228 if (bond->xdp_prog) { 2229 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2230 "Slave does not support XDP"); 2231 res = -EOPNOTSUPP; 2232 goto err_sysfs_del; 2233 } 2234 } else if (bond->xdp_prog) { 2235 struct netdev_bpf xdp = { 2236 .command = XDP_SETUP_PROG, 2237 .flags = 0, 2238 .prog = bond->xdp_prog, 2239 .extack = extack, 2240 }; 2241 2242 if (dev_xdp_prog_count(slave_dev) > 0) { 2243 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2244 "Slave has XDP program loaded, please unload before enslaving"); 2245 res = -EOPNOTSUPP; 2246 goto err_sysfs_del; 2247 } 2248 2249 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2250 if (res < 0) { 2251 /* ndo_bpf() sets extack error message */ 2252 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2253 goto err_sysfs_del; 2254 } 2255 if (bond->xdp_prog) 2256 bpf_prog_inc(bond->xdp_prog); 2257 } 2258 2259 bond_xdp_set_features(bond_dev); 2260 2261 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2262 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2263 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2264 2265 /* enslave is successful */ 2266 bond_queue_slave_event(new_slave); 2267 return 0; 2268 2269 /* Undo stages on error */ 2270 err_sysfs_del: 2271 bond_sysfs_slave_del(new_slave); 2272 2273 err_upper_unlink: 2274 bond_upper_dev_unlink(bond, new_slave); 2275 2276 err_unregister: 2277 netdev_rx_handler_unregister(slave_dev); 2278 2279 err_detach: 2280 vlan_vids_del_by_dev(slave_dev, bond_dev); 2281 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2282 RCU_INIT_POINTER(bond->primary_slave, NULL); 2283 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2284 block_netpoll_tx(); 2285 bond_change_active_slave(bond, NULL); 2286 bond_select_active_slave(bond); 2287 unblock_netpoll_tx(); 2288 } 2289 /* either primary_slave or curr_active_slave might've changed */ 2290 synchronize_rcu(); 2291 slave_disable_netpoll(new_slave); 2292 2293 err_close: 2294 if (!netif_is_bond_master(slave_dev)) 2295 slave_dev->priv_flags &= ~IFF_BONDING; 2296 dev_close(slave_dev); 2297 2298 err_restore_mac: 2299 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2300 if (!bond->params.fail_over_mac || 2301 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2302 /* XXX TODO - fom follow mode needs to change master's 2303 * MAC if this slave's MAC is in use by the bond, or at 2304 * least print a warning. 2305 */ 2306 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2307 new_slave->dev->addr_len); 2308 ss.ss_family = slave_dev->type; 2309 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2310 } 2311 2312 err_restore_mtu: 2313 dev_set_mtu(slave_dev, new_slave->original_mtu); 2314 2315 err_free: 2316 kobject_put(&new_slave->kobj); 2317 2318 err_undo_flags: 2319 /* Enslave of first slave has failed and we need to fix master's mac */ 2320 if (!bond_has_slaves(bond)) { 2321 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2322 slave_dev->dev_addr)) 2323 eth_hw_addr_random(bond_dev); 2324 if (bond_dev->type != ARPHRD_ETHER) { 2325 dev_close(bond_dev); 2326 bond_ether_setup(bond_dev); 2327 } 2328 } 2329 2330 return res; 2331 } 2332 2333 /* Try to release the slave device <slave> from the bond device <master> 2334 * It is legal to access curr_active_slave without a lock because all the function 2335 * is RTNL-locked. If "all" is true it means that the function is being called 2336 * while destroying a bond interface and all slaves are being released. 2337 * 2338 * The rules for slave state should be: 2339 * for Active/Backup: 2340 * Active stays on all backups go down 2341 * for Bonded connections: 2342 * The first up interface should be left on and all others downed. 2343 */ 2344 static int __bond_release_one(struct net_device *bond_dev, 2345 struct net_device *slave_dev, 2346 bool all, bool unregister) 2347 { 2348 struct bonding *bond = netdev_priv(bond_dev); 2349 struct slave *slave, *oldcurrent; 2350 struct sockaddr_storage ss; 2351 int old_flags = bond_dev->flags; 2352 netdev_features_t old_features = bond_dev->features; 2353 2354 /* slave is not a slave or master is not master of this slave */ 2355 if (!(slave_dev->flags & IFF_SLAVE) || 2356 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2357 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2358 return -EINVAL; 2359 } 2360 2361 block_netpoll_tx(); 2362 2363 slave = bond_get_slave_by_dev(bond, slave_dev); 2364 if (!slave) { 2365 /* not a slave of this bond */ 2366 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2367 unblock_netpoll_tx(); 2368 return -EINVAL; 2369 } 2370 2371 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2372 2373 bond_sysfs_slave_del(slave); 2374 2375 /* recompute stats just before removing the slave */ 2376 bond_get_stats(bond->dev, &bond->bond_stats); 2377 2378 if (bond->xdp_prog) { 2379 struct netdev_bpf xdp = { 2380 .command = XDP_SETUP_PROG, 2381 .flags = 0, 2382 .prog = NULL, 2383 .extack = NULL, 2384 }; 2385 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2386 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2387 } 2388 2389 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2390 * for this slave anymore. 2391 */ 2392 netdev_rx_handler_unregister(slave_dev); 2393 2394 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2395 bond_3ad_unbind_slave(slave); 2396 2397 bond_upper_dev_unlink(bond, slave); 2398 2399 if (bond_mode_can_use_xmit_hash(bond)) 2400 bond_update_slave_arr(bond, slave); 2401 2402 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2403 bond_is_active_slave(slave) ? "active" : "backup"); 2404 2405 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2406 2407 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2408 2409 if (!all && (!bond->params.fail_over_mac || 2410 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2411 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2412 bond_has_slaves(bond)) 2413 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", 2414 slave->perm_hwaddr); 2415 } 2416 2417 if (rtnl_dereference(bond->primary_slave) == slave) 2418 RCU_INIT_POINTER(bond->primary_slave, NULL); 2419 2420 if (oldcurrent == slave) 2421 bond_change_active_slave(bond, NULL); 2422 2423 if (bond_is_lb(bond)) { 2424 /* Must be called only after the slave has been 2425 * detached from the list and the curr_active_slave 2426 * has been cleared (if our_slave == old_current), 2427 * but before a new active slave is selected. 2428 */ 2429 bond_alb_deinit_slave(bond, slave); 2430 } 2431 2432 if (all) { 2433 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2434 } else if (oldcurrent == slave) { 2435 /* Note that we hold RTNL over this sequence, so there 2436 * is no concern that another slave add/remove event 2437 * will interfere. 2438 */ 2439 bond_select_active_slave(bond); 2440 } 2441 2442 bond_set_carrier(bond); 2443 if (!bond_has_slaves(bond)) 2444 eth_hw_addr_random(bond_dev); 2445 2446 unblock_netpoll_tx(); 2447 synchronize_rcu(); 2448 bond->slave_cnt--; 2449 2450 if (!bond_has_slaves(bond)) { 2451 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2452 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2453 } 2454 2455 bond_compute_features(bond); 2456 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2457 (old_features & NETIF_F_VLAN_CHALLENGED)) 2458 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2459 2460 vlan_vids_del_by_dev(slave_dev, bond_dev); 2461 2462 /* If the mode uses primary, then this case was handled above by 2463 * bond_change_active_slave(..., NULL) 2464 */ 2465 if (!bond_uses_primary(bond)) { 2466 /* unset promiscuity level from slave 2467 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2468 * of the IFF_PROMISC flag in the bond_dev, but we need the 2469 * value of that flag before that change, as that was the value 2470 * when this slave was attached, so we cache at the start of the 2471 * function and use it here. Same goes for ALLMULTI below 2472 */ 2473 if (old_flags & IFF_PROMISC) 2474 dev_set_promiscuity(slave_dev, -1); 2475 2476 /* unset allmulti level from slave */ 2477 if (old_flags & IFF_ALLMULTI) 2478 dev_set_allmulti(slave_dev, -1); 2479 2480 if (old_flags & IFF_UP) 2481 bond_hw_addr_flush(bond_dev, slave_dev); 2482 } 2483 2484 slave_disable_netpoll(slave); 2485 2486 /* close slave before restoring its mac address */ 2487 dev_close(slave_dev); 2488 2489 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2490 2491 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2492 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2493 /* restore original ("permanent") mac address */ 2494 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2495 slave->dev->addr_len); 2496 ss.ss_family = slave_dev->type; 2497 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2498 } 2499 2500 if (unregister) 2501 __dev_set_mtu(slave_dev, slave->original_mtu); 2502 else 2503 dev_set_mtu(slave_dev, slave->original_mtu); 2504 2505 if (!netif_is_bond_master(slave_dev)) 2506 slave_dev->priv_flags &= ~IFF_BONDING; 2507 2508 bond_xdp_set_features(bond_dev); 2509 kobject_put(&slave->kobj); 2510 2511 return 0; 2512 } 2513 2514 /* A wrapper used because of ndo_del_link */ 2515 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2516 { 2517 return __bond_release_one(bond_dev, slave_dev, false, false); 2518 } 2519 2520 /* First release a slave and then destroy the bond if no more slaves are left. 2521 * Must be under rtnl_lock when this function is called. 2522 */ 2523 static int bond_release_and_destroy(struct net_device *bond_dev, 2524 struct net_device *slave_dev) 2525 { 2526 struct bonding *bond = netdev_priv(bond_dev); 2527 int ret; 2528 2529 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2530 if (ret == 0 && !bond_has_slaves(bond) && 2531 bond_dev->reg_state != NETREG_UNREGISTERING) { 2532 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2533 netdev_info(bond_dev, "Destroying bond\n"); 2534 bond_remove_proc_entry(bond); 2535 unregister_netdevice(bond_dev); 2536 } 2537 return ret; 2538 } 2539 2540 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2541 { 2542 struct bonding *bond = netdev_priv(bond_dev); 2543 2544 bond_fill_ifbond(bond, info); 2545 } 2546 2547 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2548 { 2549 struct bonding *bond = netdev_priv(bond_dev); 2550 struct list_head *iter; 2551 int i = 0, res = -ENODEV; 2552 struct slave *slave; 2553 2554 bond_for_each_slave(bond, slave, iter) { 2555 if (i++ == (int)info->slave_id) { 2556 res = 0; 2557 bond_fill_ifslave(slave, info); 2558 break; 2559 } 2560 } 2561 2562 return res; 2563 } 2564 2565 /*-------------------------------- Monitoring -------------------------------*/ 2566 2567 /* called with rcu_read_lock() */ 2568 static int bond_miimon_inspect(struct bonding *bond) 2569 { 2570 bool ignore_updelay = false; 2571 int link_state, commit = 0; 2572 struct list_head *iter; 2573 struct slave *slave; 2574 2575 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 2576 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2577 } else { 2578 struct bond_up_slave *usable_slaves; 2579 2580 usable_slaves = rcu_dereference(bond->usable_slaves); 2581 2582 if (usable_slaves && usable_slaves->count == 0) 2583 ignore_updelay = true; 2584 } 2585 2586 bond_for_each_slave_rcu(bond, slave, iter) { 2587 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2588 2589 link_state = bond_check_dev_link(bond, slave->dev, 0); 2590 2591 switch (slave->link) { 2592 case BOND_LINK_UP: 2593 if (link_state) 2594 continue; 2595 2596 bond_propose_link_state(slave, BOND_LINK_FAIL); 2597 commit++; 2598 slave->delay = bond->params.downdelay; 2599 if (slave->delay) { 2600 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2601 (BOND_MODE(bond) == 2602 BOND_MODE_ACTIVEBACKUP) ? 2603 (bond_is_active_slave(slave) ? 2604 "active " : "backup ") : "", 2605 bond->params.downdelay * bond->params.miimon); 2606 } 2607 fallthrough; 2608 case BOND_LINK_FAIL: 2609 if (link_state) { 2610 /* recovered before downdelay expired */ 2611 bond_propose_link_state(slave, BOND_LINK_UP); 2612 slave->last_link_up = jiffies; 2613 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2614 (bond->params.downdelay - slave->delay) * 2615 bond->params.miimon); 2616 commit++; 2617 continue; 2618 } 2619 2620 if (slave->delay <= 0) { 2621 bond_propose_link_state(slave, BOND_LINK_DOWN); 2622 commit++; 2623 continue; 2624 } 2625 2626 slave->delay--; 2627 break; 2628 2629 case BOND_LINK_DOWN: 2630 if (!link_state) 2631 continue; 2632 2633 bond_propose_link_state(slave, BOND_LINK_BACK); 2634 commit++; 2635 slave->delay = bond->params.updelay; 2636 2637 if (slave->delay) { 2638 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2639 ignore_updelay ? 0 : 2640 bond->params.updelay * 2641 bond->params.miimon); 2642 } 2643 fallthrough; 2644 case BOND_LINK_BACK: 2645 if (!link_state) { 2646 bond_propose_link_state(slave, BOND_LINK_DOWN); 2647 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2648 (bond->params.updelay - slave->delay) * 2649 bond->params.miimon); 2650 commit++; 2651 continue; 2652 } 2653 2654 if (ignore_updelay) 2655 slave->delay = 0; 2656 2657 if (slave->delay <= 0) { 2658 bond_propose_link_state(slave, BOND_LINK_UP); 2659 commit++; 2660 ignore_updelay = false; 2661 continue; 2662 } 2663 2664 slave->delay--; 2665 break; 2666 } 2667 } 2668 2669 return commit; 2670 } 2671 2672 static void bond_miimon_link_change(struct bonding *bond, 2673 struct slave *slave, 2674 char link) 2675 { 2676 switch (BOND_MODE(bond)) { 2677 case BOND_MODE_8023AD: 2678 bond_3ad_handle_link_change(slave, link); 2679 break; 2680 case BOND_MODE_TLB: 2681 case BOND_MODE_ALB: 2682 bond_alb_handle_link_change(bond, slave, link); 2683 break; 2684 case BOND_MODE_XOR: 2685 bond_update_slave_arr(bond, NULL); 2686 break; 2687 } 2688 } 2689 2690 static void bond_miimon_commit(struct bonding *bond) 2691 { 2692 struct slave *slave, *primary, *active; 2693 bool do_failover = false; 2694 struct list_head *iter; 2695 2696 ASSERT_RTNL(); 2697 2698 bond_for_each_slave(bond, slave, iter) { 2699 switch (slave->link_new_state) { 2700 case BOND_LINK_NOCHANGE: 2701 /* For 802.3ad mode, check current slave speed and 2702 * duplex again in case its port was disabled after 2703 * invalid speed/duplex reporting but recovered before 2704 * link monitoring could make a decision on the actual 2705 * link status 2706 */ 2707 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2708 slave->link == BOND_LINK_UP) 2709 bond_3ad_adapter_speed_duplex_changed(slave); 2710 continue; 2711 2712 case BOND_LINK_UP: 2713 if (bond_update_speed_duplex(slave) && 2714 bond_needs_speed_duplex(bond)) { 2715 slave->link = BOND_LINK_DOWN; 2716 if (net_ratelimit()) 2717 slave_warn(bond->dev, slave->dev, 2718 "failed to get link speed/duplex\n"); 2719 continue; 2720 } 2721 bond_set_slave_link_state(slave, BOND_LINK_UP, 2722 BOND_SLAVE_NOTIFY_NOW); 2723 slave->last_link_up = jiffies; 2724 2725 primary = rtnl_dereference(bond->primary_slave); 2726 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2727 /* prevent it from being the active one */ 2728 bond_set_backup_slave(slave); 2729 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2730 /* make it immediately active */ 2731 bond_set_active_slave(slave); 2732 } 2733 2734 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2735 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2736 slave->duplex ? "full" : "half"); 2737 2738 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2739 2740 active = rtnl_dereference(bond->curr_active_slave); 2741 if (!active || slave == primary || slave->prio > active->prio) 2742 do_failover = true; 2743 2744 continue; 2745 2746 case BOND_LINK_DOWN: 2747 if (slave->link_failure_count < UINT_MAX) 2748 slave->link_failure_count++; 2749 2750 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2751 BOND_SLAVE_NOTIFY_NOW); 2752 2753 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2754 BOND_MODE(bond) == BOND_MODE_8023AD) 2755 bond_set_slave_inactive_flags(slave, 2756 BOND_SLAVE_NOTIFY_NOW); 2757 2758 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2759 2760 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2761 2762 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2763 do_failover = true; 2764 2765 continue; 2766 2767 default: 2768 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2769 slave->link_new_state); 2770 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2771 2772 continue; 2773 } 2774 } 2775 2776 if (do_failover) { 2777 block_netpoll_tx(); 2778 bond_select_active_slave(bond); 2779 unblock_netpoll_tx(); 2780 } 2781 2782 bond_set_carrier(bond); 2783 } 2784 2785 /* bond_mii_monitor 2786 * 2787 * Really a wrapper that splits the mii monitor into two phases: an 2788 * inspection, then (if inspection indicates something needs to be done) 2789 * an acquisition of appropriate locks followed by a commit phase to 2790 * implement whatever link state changes are indicated. 2791 */ 2792 static void bond_mii_monitor(struct work_struct *work) 2793 { 2794 struct bonding *bond = container_of(work, struct bonding, 2795 mii_work.work); 2796 bool should_notify_peers = false; 2797 bool commit; 2798 unsigned long delay; 2799 struct slave *slave; 2800 struct list_head *iter; 2801 2802 delay = msecs_to_jiffies(bond->params.miimon); 2803 2804 if (!bond_has_slaves(bond)) 2805 goto re_arm; 2806 2807 rcu_read_lock(); 2808 should_notify_peers = bond_should_notify_peers(bond); 2809 commit = !!bond_miimon_inspect(bond); 2810 if (bond->send_peer_notif) { 2811 rcu_read_unlock(); 2812 if (rtnl_trylock()) { 2813 bond->send_peer_notif--; 2814 rtnl_unlock(); 2815 } 2816 } else { 2817 rcu_read_unlock(); 2818 } 2819 2820 if (commit) { 2821 /* Race avoidance with bond_close cancel of workqueue */ 2822 if (!rtnl_trylock()) { 2823 delay = 1; 2824 should_notify_peers = false; 2825 goto re_arm; 2826 } 2827 2828 bond_for_each_slave(bond, slave, iter) { 2829 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2830 } 2831 bond_miimon_commit(bond); 2832 2833 rtnl_unlock(); /* might sleep, hold no other locks */ 2834 } 2835 2836 re_arm: 2837 if (bond->params.miimon) 2838 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2839 2840 if (should_notify_peers) { 2841 if (!rtnl_trylock()) 2842 return; 2843 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2844 rtnl_unlock(); 2845 } 2846 } 2847 2848 static int bond_upper_dev_walk(struct net_device *upper, 2849 struct netdev_nested_priv *priv) 2850 { 2851 __be32 ip = *(__be32 *)priv->data; 2852 2853 return ip == bond_confirm_addr(upper, 0, ip); 2854 } 2855 2856 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2857 { 2858 struct netdev_nested_priv priv = { 2859 .data = (void *)&ip, 2860 }; 2861 bool ret = false; 2862 2863 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2864 return true; 2865 2866 rcu_read_lock(); 2867 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2868 ret = true; 2869 rcu_read_unlock(); 2870 2871 return ret; 2872 } 2873 2874 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2875 struct sk_buff *skb) 2876 { 2877 struct net_device *bond_dev = slave->bond->dev; 2878 struct net_device *slave_dev = slave->dev; 2879 struct bond_vlan_tag *outer_tag = tags; 2880 2881 if (!tags || tags->vlan_proto == VLAN_N_VID) 2882 return true; 2883 2884 tags++; 2885 2886 /* Go through all the tags backwards and add them to the packet */ 2887 while (tags->vlan_proto != VLAN_N_VID) { 2888 if (!tags->vlan_id) { 2889 tags++; 2890 continue; 2891 } 2892 2893 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2894 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2895 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2896 tags->vlan_id); 2897 if (!skb) { 2898 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2899 return false; 2900 } 2901 2902 tags++; 2903 } 2904 /* Set the outer tag */ 2905 if (outer_tag->vlan_id) { 2906 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2907 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2908 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2909 outer_tag->vlan_id); 2910 } 2911 2912 return true; 2913 } 2914 2915 /* We go to the (large) trouble of VLAN tagging ARP frames because 2916 * switches in VLAN mode (especially if ports are configured as 2917 * "native" to a VLAN) might not pass non-tagged frames. 2918 */ 2919 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2920 __be32 src_ip, struct bond_vlan_tag *tags) 2921 { 2922 struct net_device *bond_dev = slave->bond->dev; 2923 struct net_device *slave_dev = slave->dev; 2924 struct sk_buff *skb; 2925 2926 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2927 arp_op, &dest_ip, &src_ip); 2928 2929 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2930 NULL, slave_dev->dev_addr, NULL); 2931 2932 if (!skb) { 2933 net_err_ratelimited("ARP packet allocation failed\n"); 2934 return; 2935 } 2936 2937 if (bond_handle_vlan(slave, tags, skb)) { 2938 slave_update_last_tx(slave); 2939 arp_xmit(skb); 2940 } 2941 2942 return; 2943 } 2944 2945 /* Validate the device path between the @start_dev and the @end_dev. 2946 * The path is valid if the @end_dev is reachable through device 2947 * stacking. 2948 * When the path is validated, collect any vlan information in the 2949 * path. 2950 */ 2951 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2952 struct net_device *end_dev, 2953 int level) 2954 { 2955 struct bond_vlan_tag *tags; 2956 struct net_device *upper; 2957 struct list_head *iter; 2958 2959 if (start_dev == end_dev) { 2960 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2961 if (!tags) 2962 return ERR_PTR(-ENOMEM); 2963 tags[level].vlan_proto = VLAN_N_VID; 2964 return tags; 2965 } 2966 2967 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2968 tags = bond_verify_device_path(upper, end_dev, level + 1); 2969 if (IS_ERR_OR_NULL(tags)) { 2970 if (IS_ERR(tags)) 2971 return tags; 2972 continue; 2973 } 2974 if (is_vlan_dev(upper)) { 2975 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2976 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2977 } 2978 2979 return tags; 2980 } 2981 2982 return NULL; 2983 } 2984 2985 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2986 { 2987 struct rtable *rt; 2988 struct bond_vlan_tag *tags; 2989 __be32 *targets = bond->params.arp_targets, addr; 2990 int i; 2991 2992 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2993 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2994 __func__, &targets[i]); 2995 tags = NULL; 2996 2997 /* Find out through which dev should the packet go */ 2998 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 2999 RTO_ONLINK, 0); 3000 if (IS_ERR(rt)) { 3001 /* there's no route to target - try to send arp 3002 * probe to generate any traffic (arp_validate=0) 3003 */ 3004 if (bond->params.arp_validate) 3005 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 3006 bond->dev->name, 3007 &targets[i]); 3008 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 3009 0, tags); 3010 continue; 3011 } 3012 3013 /* bond device itself */ 3014 if (rt->dst.dev == bond->dev) 3015 goto found; 3016 3017 rcu_read_lock(); 3018 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 3019 rcu_read_unlock(); 3020 3021 if (!IS_ERR_OR_NULL(tags)) 3022 goto found; 3023 3024 /* Not our device - skip */ 3025 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 3026 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 3027 3028 ip_rt_put(rt); 3029 continue; 3030 3031 found: 3032 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 3033 ip_rt_put(rt); 3034 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 3035 kfree(tags); 3036 } 3037 } 3038 3039 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 3040 { 3041 int i; 3042 3043 if (!sip || !bond_has_this_ip(bond, tip)) { 3044 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 3045 __func__, &sip, &tip); 3046 return; 3047 } 3048 3049 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3050 if (i == -1) { 3051 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3052 __func__, &sip); 3053 return; 3054 } 3055 slave->last_rx = jiffies; 3056 slave->target_last_arp_rx[i] = jiffies; 3057 } 3058 3059 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3060 struct slave *slave) 3061 { 3062 struct arphdr *arp = (struct arphdr *)skb->data; 3063 struct slave *curr_active_slave, *curr_arp_slave; 3064 unsigned char *arp_ptr; 3065 __be32 sip, tip; 3066 unsigned int alen; 3067 3068 alen = arp_hdr_len(bond->dev); 3069 3070 if (alen > skb_headlen(skb)) { 3071 arp = kmalloc(alen, GFP_ATOMIC); 3072 if (!arp) 3073 goto out_unlock; 3074 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3075 goto out_unlock; 3076 } 3077 3078 if (arp->ar_hln != bond->dev->addr_len || 3079 skb->pkt_type == PACKET_OTHERHOST || 3080 skb->pkt_type == PACKET_LOOPBACK || 3081 arp->ar_hrd != htons(ARPHRD_ETHER) || 3082 arp->ar_pro != htons(ETH_P_IP) || 3083 arp->ar_pln != 4) 3084 goto out_unlock; 3085 3086 arp_ptr = (unsigned char *)(arp + 1); 3087 arp_ptr += bond->dev->addr_len; 3088 memcpy(&sip, arp_ptr, 4); 3089 arp_ptr += 4 + bond->dev->addr_len; 3090 memcpy(&tip, arp_ptr, 4); 3091 3092 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3093 __func__, slave->dev->name, bond_slave_state(slave), 3094 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3095 &sip, &tip); 3096 3097 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3098 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3099 3100 /* We 'trust' the received ARP enough to validate it if: 3101 * 3102 * (a) the slave receiving the ARP is active (which includes the 3103 * current ARP slave, if any), or 3104 * 3105 * (b) the receiving slave isn't active, but there is a currently 3106 * active slave and it received valid arp reply(s) after it became 3107 * the currently active slave, or 3108 * 3109 * (c) there is an ARP slave that sent an ARP during the prior ARP 3110 * interval, and we receive an ARP reply on any slave. We accept 3111 * these because switch FDB update delays may deliver the ARP 3112 * reply to a slave other than the sender of the ARP request. 3113 * 3114 * Note: for (b), backup slaves are receiving the broadcast ARP 3115 * request, not a reply. This request passes from the sending 3116 * slave through the L2 switch(es) to the receiving slave. Since 3117 * this is checking the request, sip/tip are swapped for 3118 * validation. 3119 * 3120 * This is done to avoid endless looping when we can't reach the 3121 * arp_ip_target and fool ourselves with our own arp requests. 3122 */ 3123 if (bond_is_active_slave(slave)) 3124 bond_validate_arp(bond, slave, sip, tip); 3125 else if (curr_active_slave && 3126 time_after(slave_last_rx(bond, curr_active_slave), 3127 curr_active_slave->last_link_up)) 3128 bond_validate_arp(bond, slave, tip, sip); 3129 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3130 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3131 bond_validate_arp(bond, slave, sip, tip); 3132 3133 out_unlock: 3134 if (arp != (struct arphdr *)skb->data) 3135 kfree(arp); 3136 return RX_HANDLER_ANOTHER; 3137 } 3138 3139 #if IS_ENABLED(CONFIG_IPV6) 3140 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3141 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3142 { 3143 struct net_device *bond_dev = slave->bond->dev; 3144 struct net_device *slave_dev = slave->dev; 3145 struct in6_addr mcaddr; 3146 struct sk_buff *skb; 3147 3148 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3149 daddr, saddr); 3150 3151 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3152 if (!skb) { 3153 net_err_ratelimited("NS packet allocation failed\n"); 3154 return; 3155 } 3156 3157 addrconf_addr_solict_mult(daddr, &mcaddr); 3158 if (bond_handle_vlan(slave, tags, skb)) { 3159 slave_update_last_tx(slave); 3160 ndisc_send_skb(skb, &mcaddr, saddr); 3161 } 3162 } 3163 3164 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3165 { 3166 struct in6_addr *targets = bond->params.ns_targets; 3167 struct bond_vlan_tag *tags; 3168 struct dst_entry *dst; 3169 struct in6_addr saddr; 3170 struct flowi6 fl6; 3171 int i; 3172 3173 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3174 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3175 __func__, &targets[i]); 3176 tags = NULL; 3177 3178 /* Find out through which dev should the packet go */ 3179 memset(&fl6, 0, sizeof(struct flowi6)); 3180 fl6.daddr = targets[i]; 3181 fl6.flowi6_oif = bond->dev->ifindex; 3182 3183 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3184 if (dst->error) { 3185 dst_release(dst); 3186 /* there's no route to target - try to send arp 3187 * probe to generate any traffic (arp_validate=0) 3188 */ 3189 if (bond->params.arp_validate) 3190 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3191 bond->dev->name, 3192 &targets[i]); 3193 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3194 continue; 3195 } 3196 3197 /* bond device itself */ 3198 if (dst->dev == bond->dev) 3199 goto found; 3200 3201 rcu_read_lock(); 3202 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3203 rcu_read_unlock(); 3204 3205 if (!IS_ERR_OR_NULL(tags)) 3206 goto found; 3207 3208 /* Not our device - skip */ 3209 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3210 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3211 3212 dst_release(dst); 3213 continue; 3214 3215 found: 3216 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3217 bond_ns_send(slave, &targets[i], &saddr, tags); 3218 else 3219 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3220 3221 dst_release(dst); 3222 kfree(tags); 3223 } 3224 } 3225 3226 static int bond_confirm_addr6(struct net_device *dev, 3227 struct netdev_nested_priv *priv) 3228 { 3229 struct in6_addr *addr = (struct in6_addr *)priv->data; 3230 3231 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3232 } 3233 3234 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3235 { 3236 struct netdev_nested_priv priv = { 3237 .data = addr, 3238 }; 3239 int ret = false; 3240 3241 if (bond_confirm_addr6(bond->dev, &priv)) 3242 return true; 3243 3244 rcu_read_lock(); 3245 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3246 ret = true; 3247 rcu_read_unlock(); 3248 3249 return ret; 3250 } 3251 3252 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3253 struct in6_addr *saddr, struct in6_addr *daddr) 3254 { 3255 int i; 3256 3257 /* Ignore NAs that: 3258 * 1. Source address is unspecified address. 3259 * 2. Dest address is neither all-nodes multicast address nor 3260 * exist on bond interface. 3261 */ 3262 if (ipv6_addr_any(saddr) || 3263 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3264 !bond_has_this_ip6(bond, daddr))) { 3265 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3266 __func__, saddr, daddr); 3267 return; 3268 } 3269 3270 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3271 if (i == -1) { 3272 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3273 __func__, saddr); 3274 return; 3275 } 3276 slave->last_rx = jiffies; 3277 slave->target_last_arp_rx[i] = jiffies; 3278 } 3279 3280 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3281 struct slave *slave) 3282 { 3283 struct slave *curr_active_slave, *curr_arp_slave; 3284 struct in6_addr *saddr, *daddr; 3285 struct { 3286 struct ipv6hdr ip6; 3287 struct icmp6hdr icmp6; 3288 } *combined, _combined; 3289 3290 if (skb->pkt_type == PACKET_OTHERHOST || 3291 skb->pkt_type == PACKET_LOOPBACK) 3292 goto out; 3293 3294 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined); 3295 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP || 3296 (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION && 3297 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)) 3298 goto out; 3299 3300 saddr = &combined->ip6.saddr; 3301 daddr = &combined->ip6.daddr; 3302 3303 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3304 __func__, slave->dev->name, bond_slave_state(slave), 3305 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3306 saddr, daddr); 3307 3308 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3309 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3310 3311 /* We 'trust' the received ARP enough to validate it if: 3312 * see bond_arp_rcv(). 3313 */ 3314 if (bond_is_active_slave(slave)) 3315 bond_validate_na(bond, slave, saddr, daddr); 3316 else if (curr_active_slave && 3317 time_after(slave_last_rx(bond, curr_active_slave), 3318 curr_active_slave->last_link_up)) 3319 bond_validate_na(bond, slave, daddr, saddr); 3320 else if (curr_arp_slave && 3321 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3322 bond_validate_na(bond, slave, saddr, daddr); 3323 3324 out: 3325 return RX_HANDLER_ANOTHER; 3326 } 3327 #endif 3328 3329 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3330 struct slave *slave) 3331 { 3332 #if IS_ENABLED(CONFIG_IPV6) 3333 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3334 #endif 3335 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3336 3337 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3338 __func__, skb->dev->name); 3339 3340 /* Use arp validate logic for both ARP and NS */ 3341 if (!slave_do_arp_validate(bond, slave)) { 3342 if ((slave_do_arp_validate_only(bond) && is_arp) || 3343 #if IS_ENABLED(CONFIG_IPV6) 3344 (slave_do_arp_validate_only(bond) && is_ipv6) || 3345 #endif 3346 !slave_do_arp_validate_only(bond)) 3347 slave->last_rx = jiffies; 3348 return RX_HANDLER_ANOTHER; 3349 } else if (is_arp) { 3350 return bond_arp_rcv(skb, bond, slave); 3351 #if IS_ENABLED(CONFIG_IPV6) 3352 } else if (is_ipv6) { 3353 return bond_na_rcv(skb, bond, slave); 3354 #endif 3355 } else { 3356 return RX_HANDLER_ANOTHER; 3357 } 3358 } 3359 3360 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3361 { 3362 bond_arp_send_all(bond, slave); 3363 #if IS_ENABLED(CONFIG_IPV6) 3364 bond_ns_send_all(bond, slave); 3365 #endif 3366 } 3367 3368 /* function to verify if we're in the arp_interval timeslice, returns true if 3369 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3370 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3371 */ 3372 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3373 int mod) 3374 { 3375 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3376 3377 return time_in_range(jiffies, 3378 last_act - delta_in_ticks, 3379 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3380 } 3381 3382 /* This function is called regularly to monitor each slave's link 3383 * ensuring that traffic is being sent and received when arp monitoring 3384 * is used in load-balancing mode. if the adapter has been dormant, then an 3385 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3386 * arp monitoring in active backup mode. 3387 */ 3388 static void bond_loadbalance_arp_mon(struct bonding *bond) 3389 { 3390 struct slave *slave, *oldcurrent; 3391 struct list_head *iter; 3392 int do_failover = 0, slave_state_changed = 0; 3393 3394 if (!bond_has_slaves(bond)) 3395 goto re_arm; 3396 3397 rcu_read_lock(); 3398 3399 oldcurrent = rcu_dereference(bond->curr_active_slave); 3400 /* see if any of the previous devices are up now (i.e. they have 3401 * xmt and rcv traffic). the curr_active_slave does not come into 3402 * the picture unless it is null. also, slave->last_link_up is not 3403 * needed here because we send an arp on each slave and give a slave 3404 * as long as it needs to get the tx/rx within the delta. 3405 * TODO: what about up/down delay in arp mode? it wasn't here before 3406 * so it can wait 3407 */ 3408 bond_for_each_slave_rcu(bond, slave, iter) { 3409 unsigned long last_tx = slave_last_tx(slave); 3410 3411 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3412 3413 if (slave->link != BOND_LINK_UP) { 3414 if (bond_time_in_interval(bond, last_tx, 1) && 3415 bond_time_in_interval(bond, slave->last_rx, 1)) { 3416 3417 bond_propose_link_state(slave, BOND_LINK_UP); 3418 slave_state_changed = 1; 3419 3420 /* primary_slave has no meaning in round-robin 3421 * mode. the window of a slave being up and 3422 * curr_active_slave being null after enslaving 3423 * is closed. 3424 */ 3425 if (!oldcurrent) { 3426 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3427 do_failover = 1; 3428 } else { 3429 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3430 } 3431 } 3432 } else { 3433 /* slave->link == BOND_LINK_UP */ 3434 3435 /* not all switches will respond to an arp request 3436 * when the source ip is 0, so don't take the link down 3437 * if we don't know our ip yet 3438 */ 3439 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3440 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3441 3442 bond_propose_link_state(slave, BOND_LINK_DOWN); 3443 slave_state_changed = 1; 3444 3445 if (slave->link_failure_count < UINT_MAX) 3446 slave->link_failure_count++; 3447 3448 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3449 3450 if (slave == oldcurrent) 3451 do_failover = 1; 3452 } 3453 } 3454 3455 /* note: if switch is in round-robin mode, all links 3456 * must tx arp to ensure all links rx an arp - otherwise 3457 * links may oscillate or not come up at all; if switch is 3458 * in something like xor mode, there is nothing we can 3459 * do - all replies will be rx'ed on same link causing slaves 3460 * to be unstable during low/no traffic periods 3461 */ 3462 if (bond_slave_is_up(slave)) 3463 bond_send_validate(bond, slave); 3464 } 3465 3466 rcu_read_unlock(); 3467 3468 if (do_failover || slave_state_changed) { 3469 if (!rtnl_trylock()) 3470 goto re_arm; 3471 3472 bond_for_each_slave(bond, slave, iter) { 3473 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3474 slave->link = slave->link_new_state; 3475 } 3476 3477 if (slave_state_changed) { 3478 bond_slave_state_change(bond); 3479 if (BOND_MODE(bond) == BOND_MODE_XOR) 3480 bond_update_slave_arr(bond, NULL); 3481 } 3482 if (do_failover) { 3483 block_netpoll_tx(); 3484 bond_select_active_slave(bond); 3485 unblock_netpoll_tx(); 3486 } 3487 rtnl_unlock(); 3488 } 3489 3490 re_arm: 3491 if (bond->params.arp_interval) 3492 queue_delayed_work(bond->wq, &bond->arp_work, 3493 msecs_to_jiffies(bond->params.arp_interval)); 3494 } 3495 3496 /* Called to inspect slaves for active-backup mode ARP monitor link state 3497 * changes. Sets proposed link state in slaves to specify what action 3498 * should take place for the slave. Returns 0 if no changes are found, >0 3499 * if changes to link states must be committed. 3500 * 3501 * Called with rcu_read_lock held. 3502 */ 3503 static int bond_ab_arp_inspect(struct bonding *bond) 3504 { 3505 unsigned long last_tx, last_rx; 3506 struct list_head *iter; 3507 struct slave *slave; 3508 int commit = 0; 3509 3510 bond_for_each_slave_rcu(bond, slave, iter) { 3511 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3512 last_rx = slave_last_rx(bond, slave); 3513 3514 if (slave->link != BOND_LINK_UP) { 3515 if (bond_time_in_interval(bond, last_rx, 1)) { 3516 bond_propose_link_state(slave, BOND_LINK_UP); 3517 commit++; 3518 } else if (slave->link == BOND_LINK_BACK) { 3519 bond_propose_link_state(slave, BOND_LINK_FAIL); 3520 commit++; 3521 } 3522 continue; 3523 } 3524 3525 /* Give slaves 2*delta after being enslaved or made 3526 * active. This avoids bouncing, as the last receive 3527 * times need a full ARP monitor cycle to be updated. 3528 */ 3529 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3530 continue; 3531 3532 /* Backup slave is down if: 3533 * - No current_arp_slave AND 3534 * - more than (missed_max+1)*delta since last receive AND 3535 * - the bond has an IP address 3536 * 3537 * Note: a non-null current_arp_slave indicates 3538 * the curr_active_slave went down and we are 3539 * searching for a new one; under this condition 3540 * we only take the curr_active_slave down - this 3541 * gives each slave a chance to tx/rx traffic 3542 * before being taken out 3543 */ 3544 if (!bond_is_active_slave(slave) && 3545 !rcu_access_pointer(bond->current_arp_slave) && 3546 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3547 bond_propose_link_state(slave, BOND_LINK_DOWN); 3548 commit++; 3549 } 3550 3551 /* Active slave is down if: 3552 * - more than missed_max*delta since transmitting OR 3553 * - (more than missed_max*delta since receive AND 3554 * the bond has an IP address) 3555 */ 3556 last_tx = slave_last_tx(slave); 3557 if (bond_is_active_slave(slave) && 3558 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3559 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3560 bond_propose_link_state(slave, BOND_LINK_DOWN); 3561 commit++; 3562 } 3563 } 3564 3565 return commit; 3566 } 3567 3568 /* Called to commit link state changes noted by inspection step of 3569 * active-backup mode ARP monitor. 3570 * 3571 * Called with RTNL hold. 3572 */ 3573 static void bond_ab_arp_commit(struct bonding *bond) 3574 { 3575 bool do_failover = false; 3576 struct list_head *iter; 3577 unsigned long last_tx; 3578 struct slave *slave; 3579 3580 bond_for_each_slave(bond, slave, iter) { 3581 switch (slave->link_new_state) { 3582 case BOND_LINK_NOCHANGE: 3583 continue; 3584 3585 case BOND_LINK_UP: 3586 last_tx = slave_last_tx(slave); 3587 if (rtnl_dereference(bond->curr_active_slave) != slave || 3588 (!rtnl_dereference(bond->curr_active_slave) && 3589 bond_time_in_interval(bond, last_tx, 1))) { 3590 struct slave *current_arp_slave; 3591 3592 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3593 bond_set_slave_link_state(slave, BOND_LINK_UP, 3594 BOND_SLAVE_NOTIFY_NOW); 3595 if (current_arp_slave) { 3596 bond_set_slave_inactive_flags( 3597 current_arp_slave, 3598 BOND_SLAVE_NOTIFY_NOW); 3599 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3600 } 3601 3602 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3603 3604 if (!rtnl_dereference(bond->curr_active_slave) || 3605 slave == rtnl_dereference(bond->primary_slave) || 3606 slave->prio > rtnl_dereference(bond->curr_active_slave)->prio) 3607 do_failover = true; 3608 3609 } 3610 3611 continue; 3612 3613 case BOND_LINK_DOWN: 3614 if (slave->link_failure_count < UINT_MAX) 3615 slave->link_failure_count++; 3616 3617 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3618 BOND_SLAVE_NOTIFY_NOW); 3619 bond_set_slave_inactive_flags(slave, 3620 BOND_SLAVE_NOTIFY_NOW); 3621 3622 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3623 3624 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3625 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3626 do_failover = true; 3627 } 3628 3629 continue; 3630 3631 case BOND_LINK_FAIL: 3632 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3633 BOND_SLAVE_NOTIFY_NOW); 3634 bond_set_slave_inactive_flags(slave, 3635 BOND_SLAVE_NOTIFY_NOW); 3636 3637 /* A slave has just been enslaved and has become 3638 * the current active slave. 3639 */ 3640 if (rtnl_dereference(bond->curr_active_slave)) 3641 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3642 continue; 3643 3644 default: 3645 slave_err(bond->dev, slave->dev, 3646 "impossible: link_new_state %d on slave\n", 3647 slave->link_new_state); 3648 continue; 3649 } 3650 } 3651 3652 if (do_failover) { 3653 block_netpoll_tx(); 3654 bond_select_active_slave(bond); 3655 unblock_netpoll_tx(); 3656 } 3657 3658 bond_set_carrier(bond); 3659 } 3660 3661 /* Send ARP probes for active-backup mode ARP monitor. 3662 * 3663 * Called with rcu_read_lock held. 3664 */ 3665 static bool bond_ab_arp_probe(struct bonding *bond) 3666 { 3667 struct slave *slave, *before = NULL, *new_slave = NULL, 3668 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3669 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3670 struct list_head *iter; 3671 bool found = false; 3672 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3673 3674 if (curr_arp_slave && curr_active_slave) 3675 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3676 curr_arp_slave->dev->name, 3677 curr_active_slave->dev->name); 3678 3679 if (curr_active_slave) { 3680 bond_send_validate(bond, curr_active_slave); 3681 return should_notify_rtnl; 3682 } 3683 3684 /* if we don't have a curr_active_slave, search for the next available 3685 * backup slave from the current_arp_slave and make it the candidate 3686 * for becoming the curr_active_slave 3687 */ 3688 3689 if (!curr_arp_slave) { 3690 curr_arp_slave = bond_first_slave_rcu(bond); 3691 if (!curr_arp_slave) 3692 return should_notify_rtnl; 3693 } 3694 3695 bond_for_each_slave_rcu(bond, slave, iter) { 3696 if (!found && !before && bond_slave_is_up(slave)) 3697 before = slave; 3698 3699 if (found && !new_slave && bond_slave_is_up(slave)) 3700 new_slave = slave; 3701 /* if the link state is up at this point, we 3702 * mark it down - this can happen if we have 3703 * simultaneous link failures and 3704 * reselect_active_interface doesn't make this 3705 * one the current slave so it is still marked 3706 * up when it is actually down 3707 */ 3708 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3709 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3710 BOND_SLAVE_NOTIFY_LATER); 3711 if (slave->link_failure_count < UINT_MAX) 3712 slave->link_failure_count++; 3713 3714 bond_set_slave_inactive_flags(slave, 3715 BOND_SLAVE_NOTIFY_LATER); 3716 3717 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3718 } 3719 if (slave == curr_arp_slave) 3720 found = true; 3721 } 3722 3723 if (!new_slave && before) 3724 new_slave = before; 3725 3726 if (!new_slave) 3727 goto check_state; 3728 3729 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3730 BOND_SLAVE_NOTIFY_LATER); 3731 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3732 bond_send_validate(bond, new_slave); 3733 new_slave->last_link_up = jiffies; 3734 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3735 3736 check_state: 3737 bond_for_each_slave_rcu(bond, slave, iter) { 3738 if (slave->should_notify || slave->should_notify_link) { 3739 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3740 break; 3741 } 3742 } 3743 return should_notify_rtnl; 3744 } 3745 3746 static void bond_activebackup_arp_mon(struct bonding *bond) 3747 { 3748 bool should_notify_peers = false; 3749 bool should_notify_rtnl = false; 3750 int delta_in_ticks; 3751 3752 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3753 3754 if (!bond_has_slaves(bond)) 3755 goto re_arm; 3756 3757 rcu_read_lock(); 3758 3759 should_notify_peers = bond_should_notify_peers(bond); 3760 3761 if (bond_ab_arp_inspect(bond)) { 3762 rcu_read_unlock(); 3763 3764 /* Race avoidance with bond_close flush of workqueue */ 3765 if (!rtnl_trylock()) { 3766 delta_in_ticks = 1; 3767 should_notify_peers = false; 3768 goto re_arm; 3769 } 3770 3771 bond_ab_arp_commit(bond); 3772 3773 rtnl_unlock(); 3774 rcu_read_lock(); 3775 } 3776 3777 should_notify_rtnl = bond_ab_arp_probe(bond); 3778 rcu_read_unlock(); 3779 3780 re_arm: 3781 if (bond->params.arp_interval) 3782 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3783 3784 if (should_notify_peers || should_notify_rtnl) { 3785 if (!rtnl_trylock()) 3786 return; 3787 3788 if (should_notify_peers) { 3789 bond->send_peer_notif--; 3790 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3791 bond->dev); 3792 } 3793 if (should_notify_rtnl) { 3794 bond_slave_state_notify(bond); 3795 bond_slave_link_notify(bond); 3796 } 3797 3798 rtnl_unlock(); 3799 } 3800 } 3801 3802 static void bond_arp_monitor(struct work_struct *work) 3803 { 3804 struct bonding *bond = container_of(work, struct bonding, 3805 arp_work.work); 3806 3807 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3808 bond_activebackup_arp_mon(bond); 3809 else 3810 bond_loadbalance_arp_mon(bond); 3811 } 3812 3813 /*-------------------------- netdev event handling --------------------------*/ 3814 3815 /* Change device name */ 3816 static int bond_event_changename(struct bonding *bond) 3817 { 3818 bond_remove_proc_entry(bond); 3819 bond_create_proc_entry(bond); 3820 3821 bond_debug_reregister(bond); 3822 3823 return NOTIFY_DONE; 3824 } 3825 3826 static int bond_master_netdev_event(unsigned long event, 3827 struct net_device *bond_dev) 3828 { 3829 struct bonding *event_bond = netdev_priv(bond_dev); 3830 3831 netdev_dbg(bond_dev, "%s called\n", __func__); 3832 3833 switch (event) { 3834 case NETDEV_CHANGENAME: 3835 return bond_event_changename(event_bond); 3836 case NETDEV_UNREGISTER: 3837 bond_remove_proc_entry(event_bond); 3838 #ifdef CONFIG_XFRM_OFFLOAD 3839 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3840 #endif /* CONFIG_XFRM_OFFLOAD */ 3841 break; 3842 case NETDEV_REGISTER: 3843 bond_create_proc_entry(event_bond); 3844 break; 3845 default: 3846 break; 3847 } 3848 3849 return NOTIFY_DONE; 3850 } 3851 3852 static int bond_slave_netdev_event(unsigned long event, 3853 struct net_device *slave_dev) 3854 { 3855 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3856 struct bonding *bond; 3857 struct net_device *bond_dev; 3858 3859 /* A netdev event can be generated while enslaving a device 3860 * before netdev_rx_handler_register is called in which case 3861 * slave will be NULL 3862 */ 3863 if (!slave) { 3864 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3865 return NOTIFY_DONE; 3866 } 3867 3868 bond_dev = slave->bond->dev; 3869 bond = slave->bond; 3870 primary = rtnl_dereference(bond->primary_slave); 3871 3872 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3873 3874 switch (event) { 3875 case NETDEV_UNREGISTER: 3876 if (bond_dev->type != ARPHRD_ETHER) 3877 bond_release_and_destroy(bond_dev, slave_dev); 3878 else 3879 __bond_release_one(bond_dev, slave_dev, false, true); 3880 break; 3881 case NETDEV_UP: 3882 case NETDEV_CHANGE: 3883 /* For 802.3ad mode only: 3884 * Getting invalid Speed/Duplex values here will put slave 3885 * in weird state. Mark it as link-fail if the link was 3886 * previously up or link-down if it hasn't yet come up, and 3887 * let link-monitoring (miimon) set it right when correct 3888 * speeds/duplex are available. 3889 */ 3890 if (bond_update_speed_duplex(slave) && 3891 BOND_MODE(bond) == BOND_MODE_8023AD) { 3892 if (slave->last_link_up) 3893 slave->link = BOND_LINK_FAIL; 3894 else 3895 slave->link = BOND_LINK_DOWN; 3896 } 3897 3898 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3899 bond_3ad_adapter_speed_duplex_changed(slave); 3900 fallthrough; 3901 case NETDEV_DOWN: 3902 /* Refresh slave-array if applicable! 3903 * If the setup does not use miimon or arpmon (mode-specific!), 3904 * then these events will not cause the slave-array to be 3905 * refreshed. This will cause xmit to use a slave that is not 3906 * usable. Avoid such situation by refeshing the array at these 3907 * events. If these (miimon/arpmon) parameters are configured 3908 * then array gets refreshed twice and that should be fine! 3909 */ 3910 if (bond_mode_can_use_xmit_hash(bond)) 3911 bond_update_slave_arr(bond, NULL); 3912 break; 3913 case NETDEV_CHANGEMTU: 3914 /* TODO: Should slaves be allowed to 3915 * independently alter their MTU? For 3916 * an active-backup bond, slaves need 3917 * not be the same type of device, so 3918 * MTUs may vary. For other modes, 3919 * slaves arguably should have the 3920 * same MTUs. To do this, we'd need to 3921 * take over the slave's change_mtu 3922 * function for the duration of their 3923 * servitude. 3924 */ 3925 break; 3926 case NETDEV_CHANGENAME: 3927 /* we don't care if we don't have primary set */ 3928 if (!bond_uses_primary(bond) || 3929 !bond->params.primary[0]) 3930 break; 3931 3932 if (slave == primary) { 3933 /* slave's name changed - he's no longer primary */ 3934 RCU_INIT_POINTER(bond->primary_slave, NULL); 3935 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3936 /* we have a new primary slave */ 3937 rcu_assign_pointer(bond->primary_slave, slave); 3938 } else { /* we didn't change primary - exit */ 3939 break; 3940 } 3941 3942 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3943 primary ? slave_dev->name : "none"); 3944 3945 block_netpoll_tx(); 3946 bond_select_active_slave(bond); 3947 unblock_netpoll_tx(); 3948 break; 3949 case NETDEV_FEAT_CHANGE: 3950 bond_compute_features(bond); 3951 break; 3952 case NETDEV_RESEND_IGMP: 3953 /* Propagate to master device */ 3954 call_netdevice_notifiers(event, slave->bond->dev); 3955 break; 3956 case NETDEV_XDP_FEAT_CHANGE: 3957 bond_xdp_set_features(bond_dev); 3958 break; 3959 default: 3960 break; 3961 } 3962 3963 return NOTIFY_DONE; 3964 } 3965 3966 /* bond_netdev_event: handle netdev notifier chain events. 3967 * 3968 * This function receives events for the netdev chain. The caller (an 3969 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3970 * locks for us to safely manipulate the slave devices (RTNL lock, 3971 * dev_probe_lock). 3972 */ 3973 static int bond_netdev_event(struct notifier_block *this, 3974 unsigned long event, void *ptr) 3975 { 3976 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3977 3978 netdev_dbg(event_dev, "%s received %s\n", 3979 __func__, netdev_cmd_to_name(event)); 3980 3981 if (!(event_dev->priv_flags & IFF_BONDING)) 3982 return NOTIFY_DONE; 3983 3984 if (event_dev->flags & IFF_MASTER) { 3985 int ret; 3986 3987 ret = bond_master_netdev_event(event, event_dev); 3988 if (ret != NOTIFY_DONE) 3989 return ret; 3990 } 3991 3992 if (event_dev->flags & IFF_SLAVE) 3993 return bond_slave_netdev_event(event, event_dev); 3994 3995 return NOTIFY_DONE; 3996 } 3997 3998 static struct notifier_block bond_netdev_notifier = { 3999 .notifier_call = bond_netdev_event, 4000 }; 4001 4002 /*---------------------------- Hashing Policies -----------------------------*/ 4003 4004 /* Helper to access data in a packet, with or without a backing skb. 4005 * If skb is given the data is linearized if necessary via pskb_may_pull. 4006 */ 4007 static inline const void *bond_pull_data(struct sk_buff *skb, 4008 const void *data, int hlen, int n) 4009 { 4010 if (likely(n <= hlen)) 4011 return data; 4012 else if (skb && likely(pskb_may_pull(skb, n))) 4013 return skb->head; 4014 4015 return NULL; 4016 } 4017 4018 /* L2 hash helper */ 4019 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4020 { 4021 struct ethhdr *ep; 4022 4023 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4024 if (!data) 4025 return 0; 4026 4027 ep = (struct ethhdr *)(data + mhoff); 4028 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 4029 } 4030 4031 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 4032 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 4033 { 4034 const struct ipv6hdr *iph6; 4035 const struct iphdr *iph; 4036 4037 if (l2_proto == htons(ETH_P_IP)) { 4038 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 4039 if (!data) 4040 return false; 4041 4042 iph = (const struct iphdr *)(data + *nhoff); 4043 iph_to_flow_copy_v4addrs(fk, iph); 4044 *nhoff += iph->ihl << 2; 4045 if (!ip_is_fragment(iph)) 4046 *ip_proto = iph->protocol; 4047 } else if (l2_proto == htons(ETH_P_IPV6)) { 4048 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 4049 if (!data) 4050 return false; 4051 4052 iph6 = (const struct ipv6hdr *)(data + *nhoff); 4053 iph_to_flow_copy_v6addrs(fk, iph6); 4054 *nhoff += sizeof(*iph6); 4055 *ip_proto = iph6->nexthdr; 4056 } else { 4057 return false; 4058 } 4059 4060 if (l34 && *ip_proto >= 0) 4061 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 4062 4063 return true; 4064 } 4065 4066 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4067 { 4068 u32 srcmac_vendor = 0, srcmac_dev = 0; 4069 struct ethhdr *mac_hdr; 4070 u16 vlan = 0; 4071 int i; 4072 4073 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4074 if (!data) 4075 return 0; 4076 mac_hdr = (struct ethhdr *)(data + mhoff); 4077 4078 for (i = 0; i < 3; i++) 4079 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4080 4081 for (i = 3; i < ETH_ALEN; i++) 4082 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4083 4084 if (skb && skb_vlan_tag_present(skb)) 4085 vlan = skb_vlan_tag_get(skb); 4086 4087 return vlan ^ srcmac_vendor ^ srcmac_dev; 4088 } 4089 4090 /* Extract the appropriate headers based on bond's xmit policy */ 4091 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4092 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4093 { 4094 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4095 int ip_proto = -1; 4096 4097 switch (bond->params.xmit_policy) { 4098 case BOND_XMIT_POLICY_ENCAP23: 4099 case BOND_XMIT_POLICY_ENCAP34: 4100 memset(fk, 0, sizeof(*fk)); 4101 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4102 fk, data, l2_proto, nhoff, hlen, 0); 4103 default: 4104 break; 4105 } 4106 4107 fk->ports.ports = 0; 4108 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4109 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4110 return false; 4111 4112 /* ICMP error packets contains at least 8 bytes of the header 4113 * of the packet which generated the error. Use this information 4114 * to correlate ICMP error packets within the same flow which 4115 * generated the error. 4116 */ 4117 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4118 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4119 if (ip_proto == IPPROTO_ICMP) { 4120 if (!icmp_is_err(fk->icmp.type)) 4121 return true; 4122 4123 nhoff += sizeof(struct icmphdr); 4124 } else if (ip_proto == IPPROTO_ICMPV6) { 4125 if (!icmpv6_is_err(fk->icmp.type)) 4126 return true; 4127 4128 nhoff += sizeof(struct icmp6hdr); 4129 } 4130 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4131 } 4132 4133 return true; 4134 } 4135 4136 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4137 { 4138 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4139 (__force u32)flow_get_u32_src(flow); 4140 hash ^= (hash >> 16); 4141 hash ^= (hash >> 8); 4142 4143 /* discard lowest hash bit to deal with the common even ports pattern */ 4144 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4145 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4146 return hash >> 1; 4147 4148 return hash; 4149 } 4150 4151 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4152 * the data as required, but this function can be used without it if the data is 4153 * known to be linear (e.g. with xdp_buff). 4154 */ 4155 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4156 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4157 { 4158 struct flow_keys flow; 4159 u32 hash; 4160 4161 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4162 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4163 4164 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4165 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4166 return bond_eth_hash(skb, data, mhoff, hlen); 4167 4168 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4169 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4170 hash = bond_eth_hash(skb, data, mhoff, hlen); 4171 } else { 4172 if (flow.icmp.id) 4173 memcpy(&hash, &flow.icmp, sizeof(hash)); 4174 else 4175 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4176 } 4177 4178 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4179 } 4180 4181 /** 4182 * bond_xmit_hash - generate a hash value based on the xmit policy 4183 * @bond: bonding device 4184 * @skb: buffer to use for headers 4185 * 4186 * This function will extract the necessary headers from the skb buffer and use 4187 * them to generate a hash based on the xmit_policy set in the bonding device 4188 */ 4189 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4190 { 4191 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4192 skb->l4_hash) 4193 return skb->hash; 4194 4195 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4196 skb_mac_offset(skb), skb_network_offset(skb), 4197 skb_headlen(skb)); 4198 } 4199 4200 /** 4201 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4202 * @bond: bonding device 4203 * @xdp: buffer to use for headers 4204 * 4205 * The XDP variant of bond_xmit_hash. 4206 */ 4207 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4208 { 4209 struct ethhdr *eth; 4210 4211 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4212 return 0; 4213 4214 eth = (struct ethhdr *)xdp->data; 4215 4216 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4217 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4218 } 4219 4220 /*-------------------------- Device entry points ----------------------------*/ 4221 4222 void bond_work_init_all(struct bonding *bond) 4223 { 4224 INIT_DELAYED_WORK(&bond->mcast_work, 4225 bond_resend_igmp_join_requests_delayed); 4226 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4227 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4228 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4229 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4230 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4231 } 4232 4233 static void bond_work_cancel_all(struct bonding *bond) 4234 { 4235 cancel_delayed_work_sync(&bond->mii_work); 4236 cancel_delayed_work_sync(&bond->arp_work); 4237 cancel_delayed_work_sync(&bond->alb_work); 4238 cancel_delayed_work_sync(&bond->ad_work); 4239 cancel_delayed_work_sync(&bond->mcast_work); 4240 cancel_delayed_work_sync(&bond->slave_arr_work); 4241 } 4242 4243 static int bond_open(struct net_device *bond_dev) 4244 { 4245 struct bonding *bond = netdev_priv(bond_dev); 4246 struct list_head *iter; 4247 struct slave *slave; 4248 4249 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { 4250 bond->rr_tx_counter = alloc_percpu(u32); 4251 if (!bond->rr_tx_counter) 4252 return -ENOMEM; 4253 } 4254 4255 /* reset slave->backup and slave->inactive */ 4256 if (bond_has_slaves(bond)) { 4257 bond_for_each_slave(bond, slave, iter) { 4258 if (bond_uses_primary(bond) && 4259 slave != rcu_access_pointer(bond->curr_active_slave)) { 4260 bond_set_slave_inactive_flags(slave, 4261 BOND_SLAVE_NOTIFY_NOW); 4262 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4263 bond_set_slave_active_flags(slave, 4264 BOND_SLAVE_NOTIFY_NOW); 4265 } 4266 } 4267 } 4268 4269 if (bond_is_lb(bond)) { 4270 /* bond_alb_initialize must be called before the timer 4271 * is started. 4272 */ 4273 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4274 return -ENOMEM; 4275 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4276 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4277 } 4278 4279 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4280 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4281 4282 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4283 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4284 bond->recv_probe = bond_rcv_validate; 4285 } 4286 4287 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4288 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4289 /* register to receive LACPDUs */ 4290 bond->recv_probe = bond_3ad_lacpdu_recv; 4291 bond_3ad_initiate_agg_selection(bond, 1); 4292 4293 bond_for_each_slave(bond, slave, iter) 4294 dev_mc_add(slave->dev, lacpdu_mcast_addr); 4295 } 4296 4297 if (bond_mode_can_use_xmit_hash(bond)) 4298 bond_update_slave_arr(bond, NULL); 4299 4300 return 0; 4301 } 4302 4303 static int bond_close(struct net_device *bond_dev) 4304 { 4305 struct bonding *bond = netdev_priv(bond_dev); 4306 struct slave *slave; 4307 4308 bond_work_cancel_all(bond); 4309 bond->send_peer_notif = 0; 4310 if (bond_is_lb(bond)) 4311 bond_alb_deinitialize(bond); 4312 bond->recv_probe = NULL; 4313 4314 if (bond_uses_primary(bond)) { 4315 rcu_read_lock(); 4316 slave = rcu_dereference(bond->curr_active_slave); 4317 if (slave) 4318 bond_hw_addr_flush(bond_dev, slave->dev); 4319 rcu_read_unlock(); 4320 } else { 4321 struct list_head *iter; 4322 4323 bond_for_each_slave(bond, slave, iter) 4324 bond_hw_addr_flush(bond_dev, slave->dev); 4325 } 4326 4327 return 0; 4328 } 4329 4330 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4331 * that some drivers can provide 32bit values only. 4332 */ 4333 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4334 const struct rtnl_link_stats64 *_new, 4335 const struct rtnl_link_stats64 *_old) 4336 { 4337 const u64 *new = (const u64 *)_new; 4338 const u64 *old = (const u64 *)_old; 4339 u64 *res = (u64 *)_res; 4340 int i; 4341 4342 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4343 u64 nv = new[i]; 4344 u64 ov = old[i]; 4345 s64 delta = nv - ov; 4346 4347 /* detects if this particular field is 32bit only */ 4348 if (((nv | ov) >> 32) == 0) 4349 delta = (s64)(s32)((u32)nv - (u32)ov); 4350 4351 /* filter anomalies, some drivers reset their stats 4352 * at down/up events. 4353 */ 4354 if (delta > 0) 4355 res[i] += delta; 4356 } 4357 } 4358 4359 #ifdef CONFIG_LOCKDEP 4360 static int bond_get_lowest_level_rcu(struct net_device *dev) 4361 { 4362 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4363 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4364 int cur = 0, max = 0; 4365 4366 now = dev; 4367 iter = &dev->adj_list.lower; 4368 4369 while (1) { 4370 next = NULL; 4371 while (1) { 4372 ldev = netdev_next_lower_dev_rcu(now, &iter); 4373 if (!ldev) 4374 break; 4375 4376 next = ldev; 4377 niter = &ldev->adj_list.lower; 4378 dev_stack[cur] = now; 4379 iter_stack[cur++] = iter; 4380 if (max <= cur) 4381 max = cur; 4382 break; 4383 } 4384 4385 if (!next) { 4386 if (!cur) 4387 return max; 4388 next = dev_stack[--cur]; 4389 niter = iter_stack[cur]; 4390 } 4391 4392 now = next; 4393 iter = niter; 4394 } 4395 4396 return max; 4397 } 4398 #endif 4399 4400 static void bond_get_stats(struct net_device *bond_dev, 4401 struct rtnl_link_stats64 *stats) 4402 { 4403 struct bonding *bond = netdev_priv(bond_dev); 4404 struct rtnl_link_stats64 temp; 4405 struct list_head *iter; 4406 struct slave *slave; 4407 int nest_level = 0; 4408 4409 4410 rcu_read_lock(); 4411 #ifdef CONFIG_LOCKDEP 4412 nest_level = bond_get_lowest_level_rcu(bond_dev); 4413 #endif 4414 4415 spin_lock_nested(&bond->stats_lock, nest_level); 4416 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4417 4418 bond_for_each_slave_rcu(bond, slave, iter) { 4419 const struct rtnl_link_stats64 *new = 4420 dev_get_stats(slave->dev, &temp); 4421 4422 bond_fold_stats(stats, new, &slave->slave_stats); 4423 4424 /* save off the slave stats for the next run */ 4425 memcpy(&slave->slave_stats, new, sizeof(*new)); 4426 } 4427 4428 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4429 spin_unlock(&bond->stats_lock); 4430 rcu_read_unlock(); 4431 } 4432 4433 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4434 { 4435 struct bonding *bond = netdev_priv(bond_dev); 4436 struct mii_ioctl_data *mii = NULL; 4437 const struct net_device_ops *ops; 4438 struct net_device *real_dev; 4439 struct hwtstamp_config cfg; 4440 struct ifreq ifrr; 4441 int res = 0; 4442 4443 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4444 4445 switch (cmd) { 4446 case SIOCGMIIPHY: 4447 mii = if_mii(ifr); 4448 if (!mii) 4449 return -EINVAL; 4450 4451 mii->phy_id = 0; 4452 fallthrough; 4453 case SIOCGMIIREG: 4454 /* We do this again just in case we were called by SIOCGMIIREG 4455 * instead of SIOCGMIIPHY. 4456 */ 4457 mii = if_mii(ifr); 4458 if (!mii) 4459 return -EINVAL; 4460 4461 if (mii->reg_num == 1) { 4462 mii->val_out = 0; 4463 if (netif_carrier_ok(bond->dev)) 4464 mii->val_out = BMSR_LSTATUS; 4465 } 4466 4467 break; 4468 case SIOCSHWTSTAMP: 4469 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4470 return -EFAULT; 4471 4472 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4473 return -EOPNOTSUPP; 4474 4475 fallthrough; 4476 case SIOCGHWTSTAMP: 4477 real_dev = bond_option_active_slave_get_rcu(bond); 4478 if (!real_dev) 4479 return -EOPNOTSUPP; 4480 4481 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4482 ifrr.ifr_ifru = ifr->ifr_ifru; 4483 4484 ops = real_dev->netdev_ops; 4485 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4486 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4487 if (res) 4488 return res; 4489 4490 ifr->ifr_ifru = ifrr.ifr_ifru; 4491 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4492 return -EFAULT; 4493 4494 /* Set the BOND_PHC_INDEX flag to notify user space */ 4495 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4496 4497 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4498 -EFAULT : 0; 4499 } 4500 fallthrough; 4501 default: 4502 res = -EOPNOTSUPP; 4503 } 4504 4505 return res; 4506 } 4507 4508 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4509 { 4510 struct bonding *bond = netdev_priv(bond_dev); 4511 struct net_device *slave_dev = NULL; 4512 struct ifbond k_binfo; 4513 struct ifbond __user *u_binfo = NULL; 4514 struct ifslave k_sinfo; 4515 struct ifslave __user *u_sinfo = NULL; 4516 struct bond_opt_value newval; 4517 struct net *net; 4518 int res = 0; 4519 4520 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4521 4522 switch (cmd) { 4523 case SIOCBONDINFOQUERY: 4524 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4525 4526 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4527 return -EFAULT; 4528 4529 bond_info_query(bond_dev, &k_binfo); 4530 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4531 return -EFAULT; 4532 4533 return 0; 4534 case SIOCBONDSLAVEINFOQUERY: 4535 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4536 4537 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4538 return -EFAULT; 4539 4540 res = bond_slave_info_query(bond_dev, &k_sinfo); 4541 if (res == 0 && 4542 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4543 return -EFAULT; 4544 4545 return res; 4546 default: 4547 break; 4548 } 4549 4550 net = dev_net(bond_dev); 4551 4552 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4553 return -EPERM; 4554 4555 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4556 4557 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4558 4559 if (!slave_dev) 4560 return -ENODEV; 4561 4562 switch (cmd) { 4563 case SIOCBONDENSLAVE: 4564 res = bond_enslave(bond_dev, slave_dev, NULL); 4565 break; 4566 case SIOCBONDRELEASE: 4567 res = bond_release(bond_dev, slave_dev); 4568 break; 4569 case SIOCBONDSETHWADDR: 4570 res = bond_set_dev_addr(bond_dev, slave_dev); 4571 break; 4572 case SIOCBONDCHANGEACTIVE: 4573 bond_opt_initstr(&newval, slave_dev->name); 4574 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4575 &newval); 4576 break; 4577 default: 4578 res = -EOPNOTSUPP; 4579 } 4580 4581 return res; 4582 } 4583 4584 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4585 void __user *data, int cmd) 4586 { 4587 struct ifreq ifrdata = { .ifr_data = data }; 4588 4589 switch (cmd) { 4590 case BOND_INFO_QUERY_OLD: 4591 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4592 case BOND_SLAVE_INFO_QUERY_OLD: 4593 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4594 case BOND_ENSLAVE_OLD: 4595 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4596 case BOND_RELEASE_OLD: 4597 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4598 case BOND_SETHWADDR_OLD: 4599 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4600 case BOND_CHANGE_ACTIVE_OLD: 4601 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4602 } 4603 4604 return -EOPNOTSUPP; 4605 } 4606 4607 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4608 { 4609 struct bonding *bond = netdev_priv(bond_dev); 4610 4611 if (change & IFF_PROMISC) 4612 bond_set_promiscuity(bond, 4613 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4614 4615 if (change & IFF_ALLMULTI) 4616 bond_set_allmulti(bond, 4617 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4618 } 4619 4620 static void bond_set_rx_mode(struct net_device *bond_dev) 4621 { 4622 struct bonding *bond = netdev_priv(bond_dev); 4623 struct list_head *iter; 4624 struct slave *slave; 4625 4626 rcu_read_lock(); 4627 if (bond_uses_primary(bond)) { 4628 slave = rcu_dereference(bond->curr_active_slave); 4629 if (slave) { 4630 dev_uc_sync(slave->dev, bond_dev); 4631 dev_mc_sync(slave->dev, bond_dev); 4632 } 4633 } else { 4634 bond_for_each_slave_rcu(bond, slave, iter) { 4635 dev_uc_sync_multiple(slave->dev, bond_dev); 4636 dev_mc_sync_multiple(slave->dev, bond_dev); 4637 } 4638 } 4639 rcu_read_unlock(); 4640 } 4641 4642 static int bond_neigh_init(struct neighbour *n) 4643 { 4644 struct bonding *bond = netdev_priv(n->dev); 4645 const struct net_device_ops *slave_ops; 4646 struct neigh_parms parms; 4647 struct slave *slave; 4648 int ret = 0; 4649 4650 rcu_read_lock(); 4651 slave = bond_first_slave_rcu(bond); 4652 if (!slave) 4653 goto out; 4654 slave_ops = slave->dev->netdev_ops; 4655 if (!slave_ops->ndo_neigh_setup) 4656 goto out; 4657 4658 /* TODO: find another way [1] to implement this. 4659 * Passing a zeroed structure is fragile, 4660 * but at least we do not pass garbage. 4661 * 4662 * [1] One way would be that ndo_neigh_setup() never touch 4663 * struct neigh_parms, but propagate the new neigh_setup() 4664 * back to ___neigh_create() / neigh_parms_alloc() 4665 */ 4666 memset(&parms, 0, sizeof(parms)); 4667 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4668 4669 if (ret) 4670 goto out; 4671 4672 if (parms.neigh_setup) 4673 ret = parms.neigh_setup(n); 4674 out: 4675 rcu_read_unlock(); 4676 return ret; 4677 } 4678 4679 /* The bonding ndo_neigh_setup is called at init time beofre any 4680 * slave exists. So we must declare proxy setup function which will 4681 * be used at run time to resolve the actual slave neigh param setup. 4682 * 4683 * It's also called by master devices (such as vlans) to setup their 4684 * underlying devices. In that case - do nothing, we're already set up from 4685 * our init. 4686 */ 4687 static int bond_neigh_setup(struct net_device *dev, 4688 struct neigh_parms *parms) 4689 { 4690 /* modify only our neigh_parms */ 4691 if (parms->dev == dev) 4692 parms->neigh_setup = bond_neigh_init; 4693 4694 return 0; 4695 } 4696 4697 /* Change the MTU of all of a master's slaves to match the master */ 4698 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4699 { 4700 struct bonding *bond = netdev_priv(bond_dev); 4701 struct slave *slave, *rollback_slave; 4702 struct list_head *iter; 4703 int res = 0; 4704 4705 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4706 4707 bond_for_each_slave(bond, slave, iter) { 4708 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4709 slave, slave->dev->netdev_ops->ndo_change_mtu); 4710 4711 res = dev_set_mtu(slave->dev, new_mtu); 4712 4713 if (res) { 4714 /* If we failed to set the slave's mtu to the new value 4715 * we must abort the operation even in ACTIVE_BACKUP 4716 * mode, because if we allow the backup slaves to have 4717 * different mtu values than the active slave we'll 4718 * need to change their mtu when doing a failover. That 4719 * means changing their mtu from timer context, which 4720 * is probably not a good idea. 4721 */ 4722 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4723 res, new_mtu); 4724 goto unwind; 4725 } 4726 } 4727 4728 bond_dev->mtu = new_mtu; 4729 4730 return 0; 4731 4732 unwind: 4733 /* unwind from head to the slave that failed */ 4734 bond_for_each_slave(bond, rollback_slave, iter) { 4735 int tmp_res; 4736 4737 if (rollback_slave == slave) 4738 break; 4739 4740 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4741 if (tmp_res) 4742 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4743 tmp_res); 4744 } 4745 4746 return res; 4747 } 4748 4749 /* Change HW address 4750 * 4751 * Note that many devices must be down to change the HW address, and 4752 * downing the master releases all slaves. We can make bonds full of 4753 * bonding devices to test this, however. 4754 */ 4755 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4756 { 4757 struct bonding *bond = netdev_priv(bond_dev); 4758 struct slave *slave, *rollback_slave; 4759 struct sockaddr_storage *ss = addr, tmp_ss; 4760 struct list_head *iter; 4761 int res = 0; 4762 4763 if (BOND_MODE(bond) == BOND_MODE_ALB) 4764 return bond_alb_set_mac_address(bond_dev, addr); 4765 4766 4767 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4768 4769 /* If fail_over_mac is enabled, do nothing and return success. 4770 * Returning an error causes ifenslave to fail. 4771 */ 4772 if (bond->params.fail_over_mac && 4773 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4774 return 0; 4775 4776 if (!is_valid_ether_addr(ss->__data)) 4777 return -EADDRNOTAVAIL; 4778 4779 bond_for_each_slave(bond, slave, iter) { 4780 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4781 __func__, slave); 4782 res = dev_set_mac_address(slave->dev, addr, NULL); 4783 if (res) { 4784 /* TODO: consider downing the slave 4785 * and retry ? 4786 * User should expect communications 4787 * breakage anyway until ARP finish 4788 * updating, so... 4789 */ 4790 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4791 __func__, res); 4792 goto unwind; 4793 } 4794 } 4795 4796 /* success */ 4797 dev_addr_set(bond_dev, ss->__data); 4798 return 0; 4799 4800 unwind: 4801 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4802 tmp_ss.ss_family = bond_dev->type; 4803 4804 /* unwind from head to the slave that failed */ 4805 bond_for_each_slave(bond, rollback_slave, iter) { 4806 int tmp_res; 4807 4808 if (rollback_slave == slave) 4809 break; 4810 4811 tmp_res = dev_set_mac_address(rollback_slave->dev, 4812 (struct sockaddr *)&tmp_ss, NULL); 4813 if (tmp_res) { 4814 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4815 __func__, tmp_res); 4816 } 4817 } 4818 4819 return res; 4820 } 4821 4822 /** 4823 * bond_get_slave_by_id - get xmit slave with slave_id 4824 * @bond: bonding device that is transmitting 4825 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4826 * 4827 * This function tries to get slave with slave_id but in case 4828 * it fails, it tries to find the first available slave for transmission. 4829 */ 4830 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4831 int slave_id) 4832 { 4833 struct list_head *iter; 4834 struct slave *slave; 4835 int i = slave_id; 4836 4837 /* Here we start from the slave with slave_id */ 4838 bond_for_each_slave_rcu(bond, slave, iter) { 4839 if (--i < 0) { 4840 if (bond_slave_can_tx(slave)) 4841 return slave; 4842 } 4843 } 4844 4845 /* Here we start from the first slave up to slave_id */ 4846 i = slave_id; 4847 bond_for_each_slave_rcu(bond, slave, iter) { 4848 if (--i < 0) 4849 break; 4850 if (bond_slave_can_tx(slave)) 4851 return slave; 4852 } 4853 /* no slave that can tx has been found */ 4854 return NULL; 4855 } 4856 4857 /** 4858 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4859 * @bond: bonding device to use 4860 * 4861 * Based on the value of the bonding device's packets_per_slave parameter 4862 * this function generates a slave id, which is usually used as the next 4863 * slave to transmit through. 4864 */ 4865 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4866 { 4867 u32 slave_id; 4868 struct reciprocal_value reciprocal_packets_per_slave; 4869 int packets_per_slave = bond->params.packets_per_slave; 4870 4871 switch (packets_per_slave) { 4872 case 0: 4873 slave_id = get_random_u32(); 4874 break; 4875 case 1: 4876 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4877 break; 4878 default: 4879 reciprocal_packets_per_slave = 4880 bond->params.reciprocal_packets_per_slave; 4881 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4882 slave_id = reciprocal_divide(slave_id, 4883 reciprocal_packets_per_slave); 4884 break; 4885 } 4886 4887 return slave_id; 4888 } 4889 4890 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4891 struct sk_buff *skb) 4892 { 4893 struct slave *slave; 4894 int slave_cnt; 4895 u32 slave_id; 4896 4897 /* Start with the curr_active_slave that joined the bond as the 4898 * default for sending IGMP traffic. For failover purposes one 4899 * needs to maintain some consistency for the interface that will 4900 * send the join/membership reports. The curr_active_slave found 4901 * will send all of this type of traffic. 4902 */ 4903 if (skb->protocol == htons(ETH_P_IP)) { 4904 int noff = skb_network_offset(skb); 4905 struct iphdr *iph; 4906 4907 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4908 goto non_igmp; 4909 4910 iph = ip_hdr(skb); 4911 if (iph->protocol == IPPROTO_IGMP) { 4912 slave = rcu_dereference(bond->curr_active_slave); 4913 if (slave) 4914 return slave; 4915 return bond_get_slave_by_id(bond, 0); 4916 } 4917 } 4918 4919 non_igmp: 4920 slave_cnt = READ_ONCE(bond->slave_cnt); 4921 if (likely(slave_cnt)) { 4922 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4923 return bond_get_slave_by_id(bond, slave_id); 4924 } 4925 return NULL; 4926 } 4927 4928 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4929 struct xdp_buff *xdp) 4930 { 4931 struct slave *slave; 4932 int slave_cnt; 4933 u32 slave_id; 4934 const struct ethhdr *eth; 4935 void *data = xdp->data; 4936 4937 if (data + sizeof(struct ethhdr) > xdp->data_end) 4938 goto non_igmp; 4939 4940 eth = (struct ethhdr *)data; 4941 data += sizeof(struct ethhdr); 4942 4943 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4944 if (eth->h_proto == htons(ETH_P_IP)) { 4945 const struct iphdr *iph; 4946 4947 if (data + sizeof(struct iphdr) > xdp->data_end) 4948 goto non_igmp; 4949 4950 iph = (struct iphdr *)data; 4951 4952 if (iph->protocol == IPPROTO_IGMP) { 4953 slave = rcu_dereference(bond->curr_active_slave); 4954 if (slave) 4955 return slave; 4956 return bond_get_slave_by_id(bond, 0); 4957 } 4958 } 4959 4960 non_igmp: 4961 slave_cnt = READ_ONCE(bond->slave_cnt); 4962 if (likely(slave_cnt)) { 4963 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4964 return bond_get_slave_by_id(bond, slave_id); 4965 } 4966 return NULL; 4967 } 4968 4969 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4970 struct net_device *bond_dev) 4971 { 4972 struct bonding *bond = netdev_priv(bond_dev); 4973 struct slave *slave; 4974 4975 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4976 if (likely(slave)) 4977 return bond_dev_queue_xmit(bond, skb, slave->dev); 4978 4979 return bond_tx_drop(bond_dev, skb); 4980 } 4981 4982 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4983 { 4984 return rcu_dereference(bond->curr_active_slave); 4985 } 4986 4987 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4988 * the bond has a usable interface. 4989 */ 4990 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4991 struct net_device *bond_dev) 4992 { 4993 struct bonding *bond = netdev_priv(bond_dev); 4994 struct slave *slave; 4995 4996 slave = bond_xmit_activebackup_slave_get(bond); 4997 if (slave) 4998 return bond_dev_queue_xmit(bond, skb, slave->dev); 4999 5000 return bond_tx_drop(bond_dev, skb); 5001 } 5002 5003 /* Use this to update slave_array when (a) it's not appropriate to update 5004 * slave_array right away (note that update_slave_array() may sleep) 5005 * and / or (b) RTNL is not held. 5006 */ 5007 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 5008 { 5009 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 5010 } 5011 5012 /* Slave array work handler. Holds only RTNL */ 5013 static void bond_slave_arr_handler(struct work_struct *work) 5014 { 5015 struct bonding *bond = container_of(work, struct bonding, 5016 slave_arr_work.work); 5017 int ret; 5018 5019 if (!rtnl_trylock()) 5020 goto err; 5021 5022 ret = bond_update_slave_arr(bond, NULL); 5023 rtnl_unlock(); 5024 if (ret) { 5025 pr_warn_ratelimited("Failed to update slave array from WT\n"); 5026 goto err; 5027 } 5028 return; 5029 5030 err: 5031 bond_slave_arr_work_rearm(bond, 1); 5032 } 5033 5034 static void bond_skip_slave(struct bond_up_slave *slaves, 5035 struct slave *skipslave) 5036 { 5037 int idx; 5038 5039 /* Rare situation where caller has asked to skip a specific 5040 * slave but allocation failed (most likely!). BTW this is 5041 * only possible when the call is initiated from 5042 * __bond_release_one(). In this situation; overwrite the 5043 * skipslave entry in the array with the last entry from the 5044 * array to avoid a situation where the xmit path may choose 5045 * this to-be-skipped slave to send a packet out. 5046 */ 5047 for (idx = 0; slaves && idx < slaves->count; idx++) { 5048 if (skipslave == slaves->arr[idx]) { 5049 slaves->arr[idx] = 5050 slaves->arr[slaves->count - 1]; 5051 slaves->count--; 5052 break; 5053 } 5054 } 5055 } 5056 5057 static void bond_set_slave_arr(struct bonding *bond, 5058 struct bond_up_slave *usable_slaves, 5059 struct bond_up_slave *all_slaves) 5060 { 5061 struct bond_up_slave *usable, *all; 5062 5063 usable = rtnl_dereference(bond->usable_slaves); 5064 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 5065 kfree_rcu(usable, rcu); 5066 5067 all = rtnl_dereference(bond->all_slaves); 5068 rcu_assign_pointer(bond->all_slaves, all_slaves); 5069 kfree_rcu(all, rcu); 5070 } 5071 5072 static void bond_reset_slave_arr(struct bonding *bond) 5073 { 5074 struct bond_up_slave *usable, *all; 5075 5076 usable = rtnl_dereference(bond->usable_slaves); 5077 if (usable) { 5078 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5079 kfree_rcu(usable, rcu); 5080 } 5081 5082 all = rtnl_dereference(bond->all_slaves); 5083 if (all) { 5084 RCU_INIT_POINTER(bond->all_slaves, NULL); 5085 kfree_rcu(all, rcu); 5086 } 5087 } 5088 5089 /* Build the usable slaves array in control path for modes that use xmit-hash 5090 * to determine the slave interface - 5091 * (a) BOND_MODE_8023AD 5092 * (b) BOND_MODE_XOR 5093 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5094 * 5095 * The caller is expected to hold RTNL only and NO other lock! 5096 */ 5097 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5098 { 5099 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5100 struct slave *slave; 5101 struct list_head *iter; 5102 int agg_id = 0; 5103 int ret = 0; 5104 5105 might_sleep(); 5106 5107 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5108 bond->slave_cnt), GFP_KERNEL); 5109 all_slaves = kzalloc(struct_size(all_slaves, arr, 5110 bond->slave_cnt), GFP_KERNEL); 5111 if (!usable_slaves || !all_slaves) { 5112 ret = -ENOMEM; 5113 goto out; 5114 } 5115 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5116 struct ad_info ad_info; 5117 5118 spin_lock_bh(&bond->mode_lock); 5119 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5120 spin_unlock_bh(&bond->mode_lock); 5121 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5122 /* No active aggragator means it's not safe to use 5123 * the previous array. 5124 */ 5125 bond_reset_slave_arr(bond); 5126 goto out; 5127 } 5128 spin_unlock_bh(&bond->mode_lock); 5129 agg_id = ad_info.aggregator_id; 5130 } 5131 bond_for_each_slave(bond, slave, iter) { 5132 if (skipslave == slave) 5133 continue; 5134 5135 all_slaves->arr[all_slaves->count++] = slave; 5136 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5137 struct aggregator *agg; 5138 5139 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5140 if (!agg || agg->aggregator_identifier != agg_id) 5141 continue; 5142 } 5143 if (!bond_slave_can_tx(slave)) 5144 continue; 5145 5146 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5147 usable_slaves->count); 5148 5149 usable_slaves->arr[usable_slaves->count++] = slave; 5150 } 5151 5152 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5153 return ret; 5154 out: 5155 if (ret != 0 && skipslave) { 5156 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5157 skipslave); 5158 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5159 skipslave); 5160 } 5161 kfree_rcu(all_slaves, rcu); 5162 kfree_rcu(usable_slaves, rcu); 5163 5164 return ret; 5165 } 5166 5167 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5168 struct sk_buff *skb, 5169 struct bond_up_slave *slaves) 5170 { 5171 struct slave *slave; 5172 unsigned int count; 5173 u32 hash; 5174 5175 hash = bond_xmit_hash(bond, skb); 5176 count = slaves ? READ_ONCE(slaves->count) : 0; 5177 if (unlikely(!count)) 5178 return NULL; 5179 5180 slave = slaves->arr[hash % count]; 5181 return slave; 5182 } 5183 5184 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5185 struct xdp_buff *xdp) 5186 { 5187 struct bond_up_slave *slaves; 5188 unsigned int count; 5189 u32 hash; 5190 5191 hash = bond_xmit_hash_xdp(bond, xdp); 5192 slaves = rcu_dereference(bond->usable_slaves); 5193 count = slaves ? READ_ONCE(slaves->count) : 0; 5194 if (unlikely(!count)) 5195 return NULL; 5196 5197 return slaves->arr[hash % count]; 5198 } 5199 5200 /* Use this Xmit function for 3AD as well as XOR modes. The current 5201 * usable slave array is formed in the control path. The xmit function 5202 * just calculates hash and sends the packet out. 5203 */ 5204 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5205 struct net_device *dev) 5206 { 5207 struct bonding *bond = netdev_priv(dev); 5208 struct bond_up_slave *slaves; 5209 struct slave *slave; 5210 5211 slaves = rcu_dereference(bond->usable_slaves); 5212 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5213 if (likely(slave)) 5214 return bond_dev_queue_xmit(bond, skb, slave->dev); 5215 5216 return bond_tx_drop(dev, skb); 5217 } 5218 5219 /* in broadcast mode, we send everything to all usable interfaces. */ 5220 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5221 struct net_device *bond_dev) 5222 { 5223 struct bonding *bond = netdev_priv(bond_dev); 5224 struct slave *slave = NULL; 5225 struct list_head *iter; 5226 bool xmit_suc = false; 5227 bool skb_used = false; 5228 5229 bond_for_each_slave_rcu(bond, slave, iter) { 5230 struct sk_buff *skb2; 5231 5232 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5233 continue; 5234 5235 if (bond_is_last_slave(bond, slave)) { 5236 skb2 = skb; 5237 skb_used = true; 5238 } else { 5239 skb2 = skb_clone(skb, GFP_ATOMIC); 5240 if (!skb2) { 5241 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5242 bond_dev->name, __func__); 5243 continue; 5244 } 5245 } 5246 5247 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5248 xmit_suc = true; 5249 } 5250 5251 if (!skb_used) 5252 dev_kfree_skb_any(skb); 5253 5254 if (xmit_suc) 5255 return NETDEV_TX_OK; 5256 5257 dev_core_stats_tx_dropped_inc(bond_dev); 5258 return NET_XMIT_DROP; 5259 } 5260 5261 /*------------------------- Device initialization ---------------------------*/ 5262 5263 /* Lookup the slave that corresponds to a qid */ 5264 static inline int bond_slave_override(struct bonding *bond, 5265 struct sk_buff *skb) 5266 { 5267 struct slave *slave = NULL; 5268 struct list_head *iter; 5269 5270 if (!skb_rx_queue_recorded(skb)) 5271 return 1; 5272 5273 /* Find out if any slaves have the same mapping as this skb. */ 5274 bond_for_each_slave_rcu(bond, slave, iter) { 5275 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5276 if (bond_slave_is_up(slave) && 5277 slave->link == BOND_LINK_UP) { 5278 bond_dev_queue_xmit(bond, skb, slave->dev); 5279 return 0; 5280 } 5281 /* If the slave isn't UP, use default transmit policy. */ 5282 break; 5283 } 5284 } 5285 5286 return 1; 5287 } 5288 5289 5290 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5291 struct net_device *sb_dev) 5292 { 5293 /* This helper function exists to help dev_pick_tx get the correct 5294 * destination queue. Using a helper function skips a call to 5295 * skb_tx_hash and will put the skbs in the queue we expect on their 5296 * way down to the bonding driver. 5297 */ 5298 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5299 5300 /* Save the original txq to restore before passing to the driver */ 5301 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5302 5303 if (unlikely(txq >= dev->real_num_tx_queues)) { 5304 do { 5305 txq -= dev->real_num_tx_queues; 5306 } while (txq >= dev->real_num_tx_queues); 5307 } 5308 return txq; 5309 } 5310 5311 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5312 struct sk_buff *skb, 5313 bool all_slaves) 5314 { 5315 struct bonding *bond = netdev_priv(master_dev); 5316 struct bond_up_slave *slaves; 5317 struct slave *slave = NULL; 5318 5319 switch (BOND_MODE(bond)) { 5320 case BOND_MODE_ROUNDROBIN: 5321 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5322 break; 5323 case BOND_MODE_ACTIVEBACKUP: 5324 slave = bond_xmit_activebackup_slave_get(bond); 5325 break; 5326 case BOND_MODE_8023AD: 5327 case BOND_MODE_XOR: 5328 if (all_slaves) 5329 slaves = rcu_dereference(bond->all_slaves); 5330 else 5331 slaves = rcu_dereference(bond->usable_slaves); 5332 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5333 break; 5334 case BOND_MODE_BROADCAST: 5335 break; 5336 case BOND_MODE_ALB: 5337 slave = bond_xmit_alb_slave_get(bond, skb); 5338 break; 5339 case BOND_MODE_TLB: 5340 slave = bond_xmit_tlb_slave_get(bond, skb); 5341 break; 5342 default: 5343 /* Should never happen, mode already checked */ 5344 WARN_ONCE(true, "Unknown bonding mode"); 5345 break; 5346 } 5347 5348 if (slave) 5349 return slave->dev; 5350 return NULL; 5351 } 5352 5353 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5354 { 5355 switch (sk->sk_family) { 5356 #if IS_ENABLED(CONFIG_IPV6) 5357 case AF_INET6: 5358 if (ipv6_only_sock(sk) || 5359 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5360 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5361 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5362 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5363 break; 5364 } 5365 fallthrough; 5366 #endif 5367 default: /* AF_INET */ 5368 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5369 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5370 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5371 break; 5372 } 5373 5374 flow->ports.src = inet_sk(sk)->inet_sport; 5375 flow->ports.dst = inet_sk(sk)->inet_dport; 5376 } 5377 5378 /** 5379 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5380 * @sk: socket to use for headers 5381 * 5382 * This function will extract the necessary field from the socket and use 5383 * them to generate a hash based on the LAYER34 xmit_policy. 5384 * Assumes that sk is a TCP or UDP socket. 5385 */ 5386 static u32 bond_sk_hash_l34(struct sock *sk) 5387 { 5388 struct flow_keys flow; 5389 u32 hash; 5390 5391 bond_sk_to_flow(sk, &flow); 5392 5393 /* L4 */ 5394 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5395 /* L3 */ 5396 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5397 } 5398 5399 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5400 struct sock *sk) 5401 { 5402 struct bond_up_slave *slaves; 5403 struct slave *slave; 5404 unsigned int count; 5405 u32 hash; 5406 5407 slaves = rcu_dereference(bond->usable_slaves); 5408 count = slaves ? READ_ONCE(slaves->count) : 0; 5409 if (unlikely(!count)) 5410 return NULL; 5411 5412 hash = bond_sk_hash_l34(sk); 5413 slave = slaves->arr[hash % count]; 5414 5415 return slave->dev; 5416 } 5417 5418 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5419 struct sock *sk) 5420 { 5421 struct bonding *bond = netdev_priv(dev); 5422 struct net_device *lower = NULL; 5423 5424 rcu_read_lock(); 5425 if (bond_sk_check(bond)) 5426 lower = __bond_sk_get_lower_dev(bond, sk); 5427 rcu_read_unlock(); 5428 5429 return lower; 5430 } 5431 5432 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5433 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5434 struct net_device *dev) 5435 { 5436 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5437 5438 /* tls_netdev might become NULL, even if tls_is_sk_tx_device_offloaded 5439 * was true, if tls_device_down is running in parallel, but it's OK, 5440 * because bond_get_slave_by_dev has a NULL check. 5441 */ 5442 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5443 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5444 return bond_tx_drop(dev, skb); 5445 } 5446 #endif 5447 5448 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5449 { 5450 struct bonding *bond = netdev_priv(dev); 5451 5452 if (bond_should_override_tx_queue(bond) && 5453 !bond_slave_override(bond, skb)) 5454 return NETDEV_TX_OK; 5455 5456 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5457 if (skb->sk && tls_is_sk_tx_device_offloaded(skb->sk)) 5458 return bond_tls_device_xmit(bond, skb, dev); 5459 #endif 5460 5461 switch (BOND_MODE(bond)) { 5462 case BOND_MODE_ROUNDROBIN: 5463 return bond_xmit_roundrobin(skb, dev); 5464 case BOND_MODE_ACTIVEBACKUP: 5465 return bond_xmit_activebackup(skb, dev); 5466 case BOND_MODE_8023AD: 5467 case BOND_MODE_XOR: 5468 return bond_3ad_xor_xmit(skb, dev); 5469 case BOND_MODE_BROADCAST: 5470 return bond_xmit_broadcast(skb, dev); 5471 case BOND_MODE_ALB: 5472 return bond_alb_xmit(skb, dev); 5473 case BOND_MODE_TLB: 5474 return bond_tlb_xmit(skb, dev); 5475 default: 5476 /* Should never happen, mode already checked */ 5477 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5478 WARN_ON_ONCE(1); 5479 return bond_tx_drop(dev, skb); 5480 } 5481 } 5482 5483 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5484 { 5485 struct bonding *bond = netdev_priv(dev); 5486 netdev_tx_t ret = NETDEV_TX_OK; 5487 5488 /* If we risk deadlock from transmitting this in the 5489 * netpoll path, tell netpoll to queue the frame for later tx 5490 */ 5491 if (unlikely(is_netpoll_tx_blocked(dev))) 5492 return NETDEV_TX_BUSY; 5493 5494 rcu_read_lock(); 5495 if (bond_has_slaves(bond)) 5496 ret = __bond_start_xmit(skb, dev); 5497 else 5498 ret = bond_tx_drop(dev, skb); 5499 rcu_read_unlock(); 5500 5501 return ret; 5502 } 5503 5504 static struct net_device * 5505 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5506 { 5507 struct bonding *bond = netdev_priv(bond_dev); 5508 struct slave *slave; 5509 5510 /* Caller needs to hold rcu_read_lock() */ 5511 5512 switch (BOND_MODE(bond)) { 5513 case BOND_MODE_ROUNDROBIN: 5514 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5515 break; 5516 5517 case BOND_MODE_ACTIVEBACKUP: 5518 slave = bond_xmit_activebackup_slave_get(bond); 5519 break; 5520 5521 case BOND_MODE_8023AD: 5522 case BOND_MODE_XOR: 5523 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5524 break; 5525 5526 default: 5527 /* Should never happen. Mode guarded by bond_xdp_check() */ 5528 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5529 WARN_ON_ONCE(1); 5530 return NULL; 5531 } 5532 5533 if (slave) 5534 return slave->dev; 5535 5536 return NULL; 5537 } 5538 5539 static int bond_xdp_xmit(struct net_device *bond_dev, 5540 int n, struct xdp_frame **frames, u32 flags) 5541 { 5542 int nxmit, err = -ENXIO; 5543 5544 rcu_read_lock(); 5545 5546 for (nxmit = 0; nxmit < n; nxmit++) { 5547 struct xdp_frame *frame = frames[nxmit]; 5548 struct xdp_frame *frames1[] = {frame}; 5549 struct net_device *slave_dev; 5550 struct xdp_buff xdp; 5551 5552 xdp_convert_frame_to_buff(frame, &xdp); 5553 5554 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5555 if (!slave_dev) { 5556 err = -ENXIO; 5557 break; 5558 } 5559 5560 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5561 if (err < 1) 5562 break; 5563 } 5564 5565 rcu_read_unlock(); 5566 5567 /* If error happened on the first frame then we can pass the error up, otherwise 5568 * report the number of frames that were xmitted. 5569 */ 5570 if (err < 0) 5571 return (nxmit == 0 ? err : nxmit); 5572 5573 return nxmit; 5574 } 5575 5576 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5577 struct netlink_ext_ack *extack) 5578 { 5579 struct bonding *bond = netdev_priv(dev); 5580 struct list_head *iter; 5581 struct slave *slave, *rollback_slave; 5582 struct bpf_prog *old_prog; 5583 struct netdev_bpf xdp = { 5584 .command = XDP_SETUP_PROG, 5585 .flags = 0, 5586 .prog = prog, 5587 .extack = extack, 5588 }; 5589 int err; 5590 5591 ASSERT_RTNL(); 5592 5593 if (!bond_xdp_check(bond)) 5594 return -EOPNOTSUPP; 5595 5596 old_prog = bond->xdp_prog; 5597 bond->xdp_prog = prog; 5598 5599 bond_for_each_slave(bond, slave, iter) { 5600 struct net_device *slave_dev = slave->dev; 5601 5602 if (!slave_dev->netdev_ops->ndo_bpf || 5603 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5604 SLAVE_NL_ERR(dev, slave_dev, extack, 5605 "Slave device does not support XDP"); 5606 err = -EOPNOTSUPP; 5607 goto err; 5608 } 5609 5610 if (dev_xdp_prog_count(slave_dev) > 0) { 5611 SLAVE_NL_ERR(dev, slave_dev, extack, 5612 "Slave has XDP program loaded, please unload before enslaving"); 5613 err = -EOPNOTSUPP; 5614 goto err; 5615 } 5616 5617 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5618 if (err < 0) { 5619 /* ndo_bpf() sets extack error message */ 5620 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5621 goto err; 5622 } 5623 if (prog) 5624 bpf_prog_inc(prog); 5625 } 5626 5627 if (prog) { 5628 static_branch_inc(&bpf_master_redirect_enabled_key); 5629 } else if (old_prog) { 5630 bpf_prog_put(old_prog); 5631 static_branch_dec(&bpf_master_redirect_enabled_key); 5632 } 5633 5634 return 0; 5635 5636 err: 5637 /* unwind the program changes */ 5638 bond->xdp_prog = old_prog; 5639 xdp.prog = old_prog; 5640 xdp.extack = NULL; /* do not overwrite original error */ 5641 5642 bond_for_each_slave(bond, rollback_slave, iter) { 5643 struct net_device *slave_dev = rollback_slave->dev; 5644 int err_unwind; 5645 5646 if (slave == rollback_slave) 5647 break; 5648 5649 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5650 if (err_unwind < 0) 5651 slave_err(dev, slave_dev, 5652 "Error %d when unwinding XDP program change\n", err_unwind); 5653 else if (xdp.prog) 5654 bpf_prog_inc(xdp.prog); 5655 } 5656 return err; 5657 } 5658 5659 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5660 { 5661 switch (xdp->command) { 5662 case XDP_SETUP_PROG: 5663 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5664 default: 5665 return -EINVAL; 5666 } 5667 } 5668 5669 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5670 { 5671 if (speed == 0 || speed == SPEED_UNKNOWN) 5672 speed = slave->speed; 5673 else 5674 speed = min(speed, slave->speed); 5675 5676 return speed; 5677 } 5678 5679 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5680 struct ethtool_link_ksettings *cmd) 5681 { 5682 struct bonding *bond = netdev_priv(bond_dev); 5683 struct list_head *iter; 5684 struct slave *slave; 5685 u32 speed = 0; 5686 5687 cmd->base.duplex = DUPLEX_UNKNOWN; 5688 cmd->base.port = PORT_OTHER; 5689 5690 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5691 * do not need to check mode. Though link speed might not represent 5692 * the true receive or transmit bandwidth (not all modes are symmetric) 5693 * this is an accurate maximum. 5694 */ 5695 bond_for_each_slave(bond, slave, iter) { 5696 if (bond_slave_can_tx(slave)) { 5697 if (slave->speed != SPEED_UNKNOWN) { 5698 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5699 speed = bond_mode_bcast_speed(slave, 5700 speed); 5701 else 5702 speed += slave->speed; 5703 } 5704 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5705 slave->duplex != DUPLEX_UNKNOWN) 5706 cmd->base.duplex = slave->duplex; 5707 } 5708 } 5709 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5710 5711 return 0; 5712 } 5713 5714 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5715 struct ethtool_drvinfo *drvinfo) 5716 { 5717 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5718 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5719 BOND_ABI_VERSION); 5720 } 5721 5722 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5723 struct ethtool_ts_info *info) 5724 { 5725 struct bonding *bond = netdev_priv(bond_dev); 5726 struct ethtool_ts_info ts_info; 5727 const struct ethtool_ops *ops; 5728 struct net_device *real_dev; 5729 bool sw_tx_support = false; 5730 struct phy_device *phydev; 5731 struct list_head *iter; 5732 struct slave *slave; 5733 int ret = 0; 5734 5735 rcu_read_lock(); 5736 real_dev = bond_option_active_slave_get_rcu(bond); 5737 dev_hold(real_dev); 5738 rcu_read_unlock(); 5739 5740 if (real_dev) { 5741 ops = real_dev->ethtool_ops; 5742 phydev = real_dev->phydev; 5743 5744 if (phy_has_tsinfo(phydev)) { 5745 ret = phy_ts_info(phydev, info); 5746 goto out; 5747 } else if (ops->get_ts_info) { 5748 ret = ops->get_ts_info(real_dev, info); 5749 goto out; 5750 } 5751 } else { 5752 /* Check if all slaves support software tx timestamping */ 5753 rcu_read_lock(); 5754 bond_for_each_slave_rcu(bond, slave, iter) { 5755 ret = -1; 5756 ops = slave->dev->ethtool_ops; 5757 phydev = slave->dev->phydev; 5758 5759 if (phy_has_tsinfo(phydev)) 5760 ret = phy_ts_info(phydev, &ts_info); 5761 else if (ops->get_ts_info) 5762 ret = ops->get_ts_info(slave->dev, &ts_info); 5763 5764 if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) { 5765 sw_tx_support = true; 5766 continue; 5767 } 5768 5769 sw_tx_support = false; 5770 break; 5771 } 5772 rcu_read_unlock(); 5773 } 5774 5775 ret = 0; 5776 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5777 SOF_TIMESTAMPING_SOFTWARE; 5778 if (sw_tx_support) 5779 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE; 5780 5781 info->phc_index = -1; 5782 5783 out: 5784 dev_put(real_dev); 5785 return ret; 5786 } 5787 5788 static const struct ethtool_ops bond_ethtool_ops = { 5789 .get_drvinfo = bond_ethtool_get_drvinfo, 5790 .get_link = ethtool_op_get_link, 5791 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5792 .get_ts_info = bond_ethtool_get_ts_info, 5793 }; 5794 5795 static const struct net_device_ops bond_netdev_ops = { 5796 .ndo_init = bond_init, 5797 .ndo_uninit = bond_uninit, 5798 .ndo_open = bond_open, 5799 .ndo_stop = bond_close, 5800 .ndo_start_xmit = bond_start_xmit, 5801 .ndo_select_queue = bond_select_queue, 5802 .ndo_get_stats64 = bond_get_stats, 5803 .ndo_eth_ioctl = bond_eth_ioctl, 5804 .ndo_siocbond = bond_do_ioctl, 5805 .ndo_siocdevprivate = bond_siocdevprivate, 5806 .ndo_change_rx_flags = bond_change_rx_flags, 5807 .ndo_set_rx_mode = bond_set_rx_mode, 5808 .ndo_change_mtu = bond_change_mtu, 5809 .ndo_set_mac_address = bond_set_mac_address, 5810 .ndo_neigh_setup = bond_neigh_setup, 5811 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5812 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5813 #ifdef CONFIG_NET_POLL_CONTROLLER 5814 .ndo_netpoll_setup = bond_netpoll_setup, 5815 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5816 .ndo_poll_controller = bond_poll_controller, 5817 #endif 5818 .ndo_add_slave = bond_enslave, 5819 .ndo_del_slave = bond_release, 5820 .ndo_fix_features = bond_fix_features, 5821 .ndo_features_check = passthru_features_check, 5822 .ndo_get_xmit_slave = bond_xmit_get_slave, 5823 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5824 .ndo_bpf = bond_xdp, 5825 .ndo_xdp_xmit = bond_xdp_xmit, 5826 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5827 }; 5828 5829 static const struct device_type bond_type = { 5830 .name = "bond", 5831 }; 5832 5833 static void bond_destructor(struct net_device *bond_dev) 5834 { 5835 struct bonding *bond = netdev_priv(bond_dev); 5836 5837 if (bond->wq) 5838 destroy_workqueue(bond->wq); 5839 5840 if (bond->rr_tx_counter) 5841 free_percpu(bond->rr_tx_counter); 5842 } 5843 5844 void bond_setup(struct net_device *bond_dev) 5845 { 5846 struct bonding *bond = netdev_priv(bond_dev); 5847 5848 spin_lock_init(&bond->mode_lock); 5849 bond->params = bonding_defaults; 5850 5851 /* Initialize pointers */ 5852 bond->dev = bond_dev; 5853 5854 /* Initialize the device entry points */ 5855 ether_setup(bond_dev); 5856 bond_dev->max_mtu = ETH_MAX_MTU; 5857 bond_dev->netdev_ops = &bond_netdev_ops; 5858 bond_dev->ethtool_ops = &bond_ethtool_ops; 5859 5860 bond_dev->needs_free_netdev = true; 5861 bond_dev->priv_destructor = bond_destructor; 5862 5863 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5864 5865 /* Initialize the device options */ 5866 bond_dev->flags |= IFF_MASTER; 5867 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5868 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5869 5870 #ifdef CONFIG_XFRM_OFFLOAD 5871 /* set up xfrm device ops (only supported in active-backup right now) */ 5872 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5873 INIT_LIST_HEAD(&bond->ipsec_list); 5874 spin_lock_init(&bond->ipsec_lock); 5875 #endif /* CONFIG_XFRM_OFFLOAD */ 5876 5877 /* don't acquire bond device's netif_tx_lock when transmitting */ 5878 bond_dev->features |= NETIF_F_LLTX; 5879 5880 /* By default, we declare the bond to be fully 5881 * VLAN hardware accelerated capable. Special 5882 * care is taken in the various xmit functions 5883 * when there are slaves that are not hw accel 5884 * capable 5885 */ 5886 5887 /* Don't allow bond devices to change network namespaces. */ 5888 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5889 5890 bond_dev->hw_features = BOND_VLAN_FEATURES | 5891 NETIF_F_HW_VLAN_CTAG_RX | 5892 NETIF_F_HW_VLAN_CTAG_FILTER; 5893 5894 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5895 bond_dev->features |= bond_dev->hw_features; 5896 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5897 #ifdef CONFIG_XFRM_OFFLOAD 5898 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5899 /* Only enable XFRM features if this is an active-backup config */ 5900 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5901 bond_dev->features |= BOND_XFRM_FEATURES; 5902 #endif /* CONFIG_XFRM_OFFLOAD */ 5903 5904 if (bond_xdp_check(bond)) 5905 bond_dev->xdp_features = NETDEV_XDP_ACT_MASK; 5906 } 5907 5908 /* Destroy a bonding device. 5909 * Must be under rtnl_lock when this function is called. 5910 */ 5911 static void bond_uninit(struct net_device *bond_dev) 5912 { 5913 struct bonding *bond = netdev_priv(bond_dev); 5914 struct bond_up_slave *usable, *all; 5915 struct list_head *iter; 5916 struct slave *slave; 5917 5918 bond_netpoll_cleanup(bond_dev); 5919 5920 /* Release the bonded slaves */ 5921 bond_for_each_slave(bond, slave, iter) 5922 __bond_release_one(bond_dev, slave->dev, true, true); 5923 netdev_info(bond_dev, "Released all slaves\n"); 5924 5925 usable = rtnl_dereference(bond->usable_slaves); 5926 if (usable) { 5927 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5928 kfree_rcu(usable, rcu); 5929 } 5930 5931 all = rtnl_dereference(bond->all_slaves); 5932 if (all) { 5933 RCU_INIT_POINTER(bond->all_slaves, NULL); 5934 kfree_rcu(all, rcu); 5935 } 5936 5937 list_del(&bond->bond_list); 5938 5939 bond_debug_unregister(bond); 5940 } 5941 5942 /*------------------------- Module initialization ---------------------------*/ 5943 5944 static int bond_check_params(struct bond_params *params) 5945 { 5946 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5947 struct bond_opt_value newval; 5948 const struct bond_opt_value *valptr; 5949 int arp_all_targets_value = 0; 5950 u16 ad_actor_sys_prio = 0; 5951 u16 ad_user_port_key = 0; 5952 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5953 int arp_ip_count; 5954 int bond_mode = BOND_MODE_ROUNDROBIN; 5955 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5956 int lacp_fast = 0; 5957 int tlb_dynamic_lb; 5958 5959 /* Convert string parameters. */ 5960 if (mode) { 5961 bond_opt_initstr(&newval, mode); 5962 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5963 if (!valptr) { 5964 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5965 return -EINVAL; 5966 } 5967 bond_mode = valptr->value; 5968 } 5969 5970 if (xmit_hash_policy) { 5971 if (bond_mode == BOND_MODE_ROUNDROBIN || 5972 bond_mode == BOND_MODE_ACTIVEBACKUP || 5973 bond_mode == BOND_MODE_BROADCAST) { 5974 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5975 bond_mode_name(bond_mode)); 5976 } else { 5977 bond_opt_initstr(&newval, xmit_hash_policy); 5978 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5979 &newval); 5980 if (!valptr) { 5981 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5982 xmit_hash_policy); 5983 return -EINVAL; 5984 } 5985 xmit_hashtype = valptr->value; 5986 } 5987 } 5988 5989 if (lacp_rate) { 5990 if (bond_mode != BOND_MODE_8023AD) { 5991 pr_info("lacp_rate param is irrelevant in mode %s\n", 5992 bond_mode_name(bond_mode)); 5993 } else { 5994 bond_opt_initstr(&newval, lacp_rate); 5995 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 5996 &newval); 5997 if (!valptr) { 5998 pr_err("Error: Invalid lacp rate \"%s\"\n", 5999 lacp_rate); 6000 return -EINVAL; 6001 } 6002 lacp_fast = valptr->value; 6003 } 6004 } 6005 6006 if (ad_select) { 6007 bond_opt_initstr(&newval, ad_select); 6008 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 6009 &newval); 6010 if (!valptr) { 6011 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 6012 return -EINVAL; 6013 } 6014 params->ad_select = valptr->value; 6015 if (bond_mode != BOND_MODE_8023AD) 6016 pr_warn("ad_select param only affects 802.3ad mode\n"); 6017 } else { 6018 params->ad_select = BOND_AD_STABLE; 6019 } 6020 6021 if (max_bonds < 0) { 6022 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 6023 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 6024 max_bonds = BOND_DEFAULT_MAX_BONDS; 6025 } 6026 6027 if (miimon < 0) { 6028 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6029 miimon, INT_MAX); 6030 miimon = 0; 6031 } 6032 6033 if (updelay < 0) { 6034 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6035 updelay, INT_MAX); 6036 updelay = 0; 6037 } 6038 6039 if (downdelay < 0) { 6040 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6041 downdelay, INT_MAX); 6042 downdelay = 0; 6043 } 6044 6045 if ((use_carrier != 0) && (use_carrier != 1)) { 6046 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 6047 use_carrier); 6048 use_carrier = 1; 6049 } 6050 6051 if (num_peer_notif < 0 || num_peer_notif > 255) { 6052 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 6053 num_peer_notif); 6054 num_peer_notif = 1; 6055 } 6056 6057 /* reset values for 802.3ad/TLB/ALB */ 6058 if (!bond_mode_uses_arp(bond_mode)) { 6059 if (!miimon) { 6060 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"); 6061 pr_warn("Forcing miimon to 100msec\n"); 6062 miimon = BOND_DEFAULT_MIIMON; 6063 } 6064 } 6065 6066 if (tx_queues < 1 || tx_queues > 255) { 6067 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 6068 tx_queues, BOND_DEFAULT_TX_QUEUES); 6069 tx_queues = BOND_DEFAULT_TX_QUEUES; 6070 } 6071 6072 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 6073 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 6074 all_slaves_active); 6075 all_slaves_active = 0; 6076 } 6077 6078 if (resend_igmp < 0 || resend_igmp > 255) { 6079 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 6080 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 6081 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 6082 } 6083 6084 bond_opt_initval(&newval, packets_per_slave); 6085 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 6086 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 6087 packets_per_slave, USHRT_MAX); 6088 packets_per_slave = 1; 6089 } 6090 6091 if (bond_mode == BOND_MODE_ALB) { 6092 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", 6093 updelay); 6094 } 6095 6096 if (!miimon) { 6097 if (updelay || downdelay) { 6098 /* just warn the user the up/down delay will have 6099 * no effect since miimon is zero... 6100 */ 6101 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", 6102 updelay, downdelay); 6103 } 6104 } else { 6105 /* don't allow arp monitoring */ 6106 if (arp_interval) { 6107 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 6108 miimon, arp_interval); 6109 arp_interval = 0; 6110 } 6111 6112 if ((updelay % miimon) != 0) { 6113 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6114 updelay, miimon, (updelay / miimon) * miimon); 6115 } 6116 6117 updelay /= miimon; 6118 6119 if ((downdelay % miimon) != 0) { 6120 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6121 downdelay, miimon, 6122 (downdelay / miimon) * miimon); 6123 } 6124 6125 downdelay /= miimon; 6126 } 6127 6128 if (arp_interval < 0) { 6129 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6130 arp_interval, INT_MAX); 6131 arp_interval = 0; 6132 } 6133 6134 for (arp_ip_count = 0, i = 0; 6135 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6136 __be32 ip; 6137 6138 /* not a complete check, but good enough to catch mistakes */ 6139 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6140 !bond_is_ip_target_ok(ip)) { 6141 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6142 arp_ip_target[i]); 6143 arp_interval = 0; 6144 } else { 6145 if (bond_get_targets_ip(arp_target, ip) == -1) 6146 arp_target[arp_ip_count++] = ip; 6147 else 6148 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6149 &ip); 6150 } 6151 } 6152 6153 if (arp_interval && !arp_ip_count) { 6154 /* don't allow arping if no arp_ip_target given... */ 6155 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6156 arp_interval); 6157 arp_interval = 0; 6158 } 6159 6160 if (arp_validate) { 6161 if (!arp_interval) { 6162 pr_err("arp_validate requires arp_interval\n"); 6163 return -EINVAL; 6164 } 6165 6166 bond_opt_initstr(&newval, arp_validate); 6167 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6168 &newval); 6169 if (!valptr) { 6170 pr_err("Error: invalid arp_validate \"%s\"\n", 6171 arp_validate); 6172 return -EINVAL; 6173 } 6174 arp_validate_value = valptr->value; 6175 } else { 6176 arp_validate_value = 0; 6177 } 6178 6179 if (arp_all_targets) { 6180 bond_opt_initstr(&newval, arp_all_targets); 6181 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6182 &newval); 6183 if (!valptr) { 6184 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6185 arp_all_targets); 6186 arp_all_targets_value = 0; 6187 } else { 6188 arp_all_targets_value = valptr->value; 6189 } 6190 } 6191 6192 if (miimon) { 6193 pr_info("MII link monitoring set to %d ms\n", miimon); 6194 } else if (arp_interval) { 6195 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6196 arp_validate_value); 6197 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6198 arp_interval, valptr->string, arp_ip_count); 6199 6200 for (i = 0; i < arp_ip_count; i++) 6201 pr_cont(" %s", arp_ip_target[i]); 6202 6203 pr_cont("\n"); 6204 6205 } else if (max_bonds) { 6206 /* miimon and arp_interval not set, we need one so things 6207 * work as expected, see bonding.txt for details 6208 */ 6209 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"); 6210 } 6211 6212 if (primary && !bond_mode_uses_primary(bond_mode)) { 6213 /* currently, using a primary only makes sense 6214 * in active backup, TLB or ALB modes 6215 */ 6216 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6217 primary, bond_mode_name(bond_mode)); 6218 primary = NULL; 6219 } 6220 6221 if (primary && primary_reselect) { 6222 bond_opt_initstr(&newval, primary_reselect); 6223 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6224 &newval); 6225 if (!valptr) { 6226 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6227 primary_reselect); 6228 return -EINVAL; 6229 } 6230 primary_reselect_value = valptr->value; 6231 } else { 6232 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6233 } 6234 6235 if (fail_over_mac) { 6236 bond_opt_initstr(&newval, fail_over_mac); 6237 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6238 &newval); 6239 if (!valptr) { 6240 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6241 fail_over_mac); 6242 return -EINVAL; 6243 } 6244 fail_over_mac_value = valptr->value; 6245 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6246 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6247 } else { 6248 fail_over_mac_value = BOND_FOM_NONE; 6249 } 6250 6251 bond_opt_initstr(&newval, "default"); 6252 valptr = bond_opt_parse( 6253 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6254 &newval); 6255 if (!valptr) { 6256 pr_err("Error: No ad_actor_sys_prio default value"); 6257 return -EINVAL; 6258 } 6259 ad_actor_sys_prio = valptr->value; 6260 6261 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6262 &newval); 6263 if (!valptr) { 6264 pr_err("Error: No ad_user_port_key default value"); 6265 return -EINVAL; 6266 } 6267 ad_user_port_key = valptr->value; 6268 6269 bond_opt_initstr(&newval, "default"); 6270 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6271 if (!valptr) { 6272 pr_err("Error: No tlb_dynamic_lb default value"); 6273 return -EINVAL; 6274 } 6275 tlb_dynamic_lb = valptr->value; 6276 6277 if (lp_interval == 0) { 6278 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6279 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6280 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6281 } 6282 6283 /* fill params struct with the proper values */ 6284 params->mode = bond_mode; 6285 params->xmit_policy = xmit_hashtype; 6286 params->miimon = miimon; 6287 params->num_peer_notif = num_peer_notif; 6288 params->arp_interval = arp_interval; 6289 params->arp_validate = arp_validate_value; 6290 params->arp_all_targets = arp_all_targets_value; 6291 params->missed_max = 2; 6292 params->updelay = updelay; 6293 params->downdelay = downdelay; 6294 params->peer_notif_delay = 0; 6295 params->use_carrier = use_carrier; 6296 params->lacp_active = 1; 6297 params->lacp_fast = lacp_fast; 6298 params->primary[0] = 0; 6299 params->primary_reselect = primary_reselect_value; 6300 params->fail_over_mac = fail_over_mac_value; 6301 params->tx_queues = tx_queues; 6302 params->all_slaves_active = all_slaves_active; 6303 params->resend_igmp = resend_igmp; 6304 params->min_links = min_links; 6305 params->lp_interval = lp_interval; 6306 params->packets_per_slave = packets_per_slave; 6307 params->tlb_dynamic_lb = tlb_dynamic_lb; 6308 params->ad_actor_sys_prio = ad_actor_sys_prio; 6309 eth_zero_addr(params->ad_actor_system); 6310 params->ad_user_port_key = ad_user_port_key; 6311 if (packets_per_slave > 0) { 6312 params->reciprocal_packets_per_slave = 6313 reciprocal_value(packets_per_slave); 6314 } else { 6315 /* reciprocal_packets_per_slave is unused if 6316 * packets_per_slave is 0 or 1, just initialize it 6317 */ 6318 params->reciprocal_packets_per_slave = 6319 (struct reciprocal_value) { 0 }; 6320 } 6321 6322 if (primary) 6323 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6324 6325 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6326 #if IS_ENABLED(CONFIG_IPV6) 6327 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6328 #endif 6329 6330 return 0; 6331 } 6332 6333 /* Called from registration process */ 6334 static int bond_init(struct net_device *bond_dev) 6335 { 6336 struct bonding *bond = netdev_priv(bond_dev); 6337 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6338 6339 netdev_dbg(bond_dev, "Begin bond_init\n"); 6340 6341 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6342 if (!bond->wq) 6343 return -ENOMEM; 6344 6345 spin_lock_init(&bond->stats_lock); 6346 netdev_lockdep_set_classes(bond_dev); 6347 6348 list_add_tail(&bond->bond_list, &bn->dev_list); 6349 6350 bond_prepare_sysfs_group(bond); 6351 6352 bond_debug_register(bond); 6353 6354 /* Ensure valid dev_addr */ 6355 if (is_zero_ether_addr(bond_dev->dev_addr) && 6356 bond_dev->addr_assign_type == NET_ADDR_PERM) 6357 eth_hw_addr_random(bond_dev); 6358 6359 return 0; 6360 } 6361 6362 unsigned int bond_get_num_tx_queues(void) 6363 { 6364 return tx_queues; 6365 } 6366 6367 /* Create a new bond based on the specified name and bonding parameters. 6368 * If name is NULL, obtain a suitable "bond%d" name for us. 6369 * Caller must NOT hold rtnl_lock; we need to release it here before we 6370 * set up our sysfs entries. 6371 */ 6372 int bond_create(struct net *net, const char *name) 6373 { 6374 struct net_device *bond_dev; 6375 struct bonding *bond; 6376 int res = -ENOMEM; 6377 6378 rtnl_lock(); 6379 6380 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6381 name ? name : "bond%d", NET_NAME_UNKNOWN, 6382 bond_setup, tx_queues); 6383 if (!bond_dev) 6384 goto out; 6385 6386 bond = netdev_priv(bond_dev); 6387 dev_net_set(bond_dev, net); 6388 bond_dev->rtnl_link_ops = &bond_link_ops; 6389 6390 res = register_netdevice(bond_dev); 6391 if (res < 0) { 6392 free_netdev(bond_dev); 6393 goto out; 6394 } 6395 6396 netif_carrier_off(bond_dev); 6397 6398 bond_work_init_all(bond); 6399 6400 out: 6401 rtnl_unlock(); 6402 return res; 6403 } 6404 6405 static int __net_init bond_net_init(struct net *net) 6406 { 6407 struct bond_net *bn = net_generic(net, bond_net_id); 6408 6409 bn->net = net; 6410 INIT_LIST_HEAD(&bn->dev_list); 6411 6412 bond_create_proc_dir(bn); 6413 bond_create_sysfs(bn); 6414 6415 return 0; 6416 } 6417 6418 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6419 { 6420 struct bond_net *bn; 6421 struct net *net; 6422 LIST_HEAD(list); 6423 6424 list_for_each_entry(net, net_list, exit_list) { 6425 bn = net_generic(net, bond_net_id); 6426 bond_destroy_sysfs(bn); 6427 } 6428 6429 /* Kill off any bonds created after unregistering bond rtnl ops */ 6430 rtnl_lock(); 6431 list_for_each_entry(net, net_list, exit_list) { 6432 struct bonding *bond, *tmp_bond; 6433 6434 bn = net_generic(net, bond_net_id); 6435 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6436 unregister_netdevice_queue(bond->dev, &list); 6437 } 6438 unregister_netdevice_many(&list); 6439 rtnl_unlock(); 6440 6441 list_for_each_entry(net, net_list, exit_list) { 6442 bn = net_generic(net, bond_net_id); 6443 bond_destroy_proc_dir(bn); 6444 } 6445 } 6446 6447 static struct pernet_operations bond_net_ops = { 6448 .init = bond_net_init, 6449 .exit_batch = bond_net_exit_batch, 6450 .id = &bond_net_id, 6451 .size = sizeof(struct bond_net), 6452 }; 6453 6454 static int __init bonding_init(void) 6455 { 6456 int i; 6457 int res; 6458 6459 res = bond_check_params(&bonding_defaults); 6460 if (res) 6461 goto out; 6462 6463 res = register_pernet_subsys(&bond_net_ops); 6464 if (res) 6465 goto out; 6466 6467 res = bond_netlink_init(); 6468 if (res) 6469 goto err_link; 6470 6471 bond_create_debugfs(); 6472 6473 for (i = 0; i < max_bonds; i++) { 6474 res = bond_create(&init_net, NULL); 6475 if (res) 6476 goto err; 6477 } 6478 6479 skb_flow_dissector_init(&flow_keys_bonding, 6480 flow_keys_bonding_keys, 6481 ARRAY_SIZE(flow_keys_bonding_keys)); 6482 6483 register_netdevice_notifier(&bond_netdev_notifier); 6484 out: 6485 return res; 6486 err: 6487 bond_destroy_debugfs(); 6488 bond_netlink_fini(); 6489 err_link: 6490 unregister_pernet_subsys(&bond_net_ops); 6491 goto out; 6492 6493 } 6494 6495 static void __exit bonding_exit(void) 6496 { 6497 unregister_netdevice_notifier(&bond_netdev_notifier); 6498 6499 bond_destroy_debugfs(); 6500 6501 bond_netlink_fini(); 6502 unregister_pernet_subsys(&bond_net_ops); 6503 6504 #ifdef CONFIG_NET_POLL_CONTROLLER 6505 /* Make sure we don't have an imbalance on our netpoll blocking */ 6506 WARN_ON(atomic_read(&netpoll_block_tx)); 6507 #endif 6508 } 6509 6510 module_init(bonding_init); 6511 module_exit(bonding_exit); 6512 MODULE_LICENSE("GPL"); 6513 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6514 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6515