1 // SPDX-License-Identifier: GPL-1.0+ 2 /* 3 * originally based on the dummy device. 4 * 5 * Copyright 1999, Thomas Davis, tadavis@lbl.gov. 6 * Based on dummy.c, and eql.c devices. 7 * 8 * bonding.c: an Ethernet Bonding driver 9 * 10 * This is useful to talk to a Cisco EtherChannel compatible equipment: 11 * Cisco 5500 12 * Sun Trunking (Solaris) 13 * Alteon AceDirector Trunks 14 * Linux Bonding 15 * and probably many L2 switches ... 16 * 17 * How it works: 18 * ifconfig bond0 ipaddress netmask up 19 * will setup a network device, with an ip address. No mac address 20 * will be assigned at this time. The hw mac address will come from 21 * the first slave bonded to the channel. All slaves will then use 22 * this hw mac address. 23 * 24 * ifconfig bond0 down 25 * will release all slaves, marking them as down. 26 * 27 * ifenslave bond0 eth0 28 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either 29 * a: be used as initial mac address 30 * b: if a hw mac address already is there, eth0's hw mac address 31 * will then be set from bond0. 32 * 33 */ 34 35 #include <linux/kernel.h> 36 #include <linux/module.h> 37 #include <linux/types.h> 38 #include <linux/fcntl.h> 39 #include <linux/filter.h> 40 #include <linux/interrupt.h> 41 #include <linux/ptrace.h> 42 #include <linux/ioport.h> 43 #include <linux/in.h> 44 #include <net/ip.h> 45 #include <linux/ip.h> 46 #include <linux/icmp.h> 47 #include <linux/icmpv6.h> 48 #include <linux/tcp.h> 49 #include <linux/udp.h> 50 #include <linux/slab.h> 51 #include <linux/string.h> 52 #include <linux/init.h> 53 #include <linux/timer.h> 54 #include <linux/socket.h> 55 #include <linux/ctype.h> 56 #include <linux/inet.h> 57 #include <linux/bitops.h> 58 #include <linux/io.h> 59 #include <asm/dma.h> 60 #include <linux/uaccess.h> 61 #include <linux/errno.h> 62 #include <linux/netdevice.h> 63 #include <linux/inetdevice.h> 64 #include <linux/igmp.h> 65 #include <linux/etherdevice.h> 66 #include <linux/skbuff.h> 67 #include <net/sock.h> 68 #include <linux/rtnetlink.h> 69 #include <linux/smp.h> 70 #include <linux/if_ether.h> 71 #include <net/arp.h> 72 #include <linux/mii.h> 73 #include <linux/ethtool.h> 74 #include <linux/if_vlan.h> 75 #include <linux/if_bonding.h> 76 #include <linux/phy.h> 77 #include <linux/jiffies.h> 78 #include <linux/preempt.h> 79 #include <net/route.h> 80 #include <net/net_namespace.h> 81 #include <net/netns/generic.h> 82 #include <net/pkt_sched.h> 83 #include <linux/rculist.h> 84 #include <net/flow_dissector.h> 85 #include <net/xfrm.h> 86 #include <net/bonding.h> 87 #include <net/bond_3ad.h> 88 #include <net/bond_alb.h> 89 #if IS_ENABLED(CONFIG_TLS_DEVICE) 90 #include <net/tls.h> 91 #endif 92 #include <net/ip6_route.h> 93 94 #include "bonding_priv.h" 95 96 /*---------------------------- Module parameters ----------------------------*/ 97 98 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 99 100 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 101 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 102 static int num_peer_notif = 1; 103 static int miimon; 104 static int updelay; 105 static int downdelay; 106 static int use_carrier = 1; 107 static char *mode; 108 static char *primary; 109 static char *primary_reselect; 110 static char *lacp_rate; 111 static int min_links; 112 static char *ad_select; 113 static char *xmit_hash_policy; 114 static int arp_interval; 115 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 116 static char *arp_validate; 117 static char *arp_all_targets; 118 static char *fail_over_mac; 119 static int all_slaves_active; 120 static struct bond_params bonding_defaults; 121 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 122 static int packets_per_slave = 1; 123 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 124 125 module_param(max_bonds, int, 0); 126 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 127 module_param(tx_queues, int, 0); 128 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 129 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 130 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 131 "failover event (alias of num_unsol_na)"); 132 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 133 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 134 "failover event (alias of num_grat_arp)"); 135 module_param(miimon, int, 0); 136 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 137 module_param(updelay, int, 0); 138 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 139 module_param(downdelay, int, 0); 140 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 141 "in milliseconds"); 142 module_param(use_carrier, int, 0); 143 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 144 "0 for off, 1 for on (default)"); 145 module_param(mode, charp, 0); 146 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 147 "1 for active-backup, 2 for balance-xor, " 148 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 149 "6 for balance-alb"); 150 module_param(primary, charp, 0); 151 MODULE_PARM_DESC(primary, "Primary network device to use"); 152 module_param(primary_reselect, charp, 0); 153 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 154 "once it comes up; " 155 "0 for always (default), " 156 "1 for only if speed of primary is " 157 "better, " 158 "2 for only on active slave " 159 "failure"); 160 module_param(lacp_rate, charp, 0); 161 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 162 "0 for slow, 1 for fast"); 163 module_param(ad_select, charp, 0); 164 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 165 "0 for stable (default), 1 for bandwidth, " 166 "2 for count"); 167 module_param(min_links, int, 0); 168 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 169 170 module_param(xmit_hash_policy, charp, 0); 171 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " 172 "0 for layer 2 (default), 1 for layer 3+4, " 173 "2 for layer 2+3, 3 for encap layer 2+3, " 174 "4 for encap layer 3+4, 5 for vlan+srcmac"); 175 module_param(arp_interval, int, 0); 176 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 177 module_param_array(arp_ip_target, charp, NULL, 0); 178 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 179 module_param(arp_validate, charp, 0); 180 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 181 "0 for none (default), 1 for active, " 182 "2 for backup, 3 for all"); 183 module_param(arp_all_targets, charp, 0); 184 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 185 module_param(fail_over_mac, charp, 0); 186 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 187 "the same MAC; 0 for none (default), " 188 "1 for active, 2 for follow"); 189 module_param(all_slaves_active, int, 0); 190 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 191 "by setting active flag for all slaves; " 192 "0 for never (default), 1 for always."); 193 module_param(resend_igmp, int, 0); 194 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 195 "link failure"); 196 module_param(packets_per_slave, int, 0); 197 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 198 "mode; 0 for a random slave, 1 packet per " 199 "slave (default), >1 packets per slave."); 200 module_param(lp_interval, uint, 0); 201 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 202 "the bonding driver sends learning packets to " 203 "each slaves peer switch. The default is 1."); 204 205 /*----------------------------- Global variables ----------------------------*/ 206 207 #ifdef CONFIG_NET_POLL_CONTROLLER 208 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 209 #endif 210 211 unsigned int bond_net_id __read_mostly; 212 213 static const struct flow_dissector_key flow_keys_bonding_keys[] = { 214 { 215 .key_id = FLOW_DISSECTOR_KEY_CONTROL, 216 .offset = offsetof(struct flow_keys, control), 217 }, 218 { 219 .key_id = FLOW_DISSECTOR_KEY_BASIC, 220 .offset = offsetof(struct flow_keys, basic), 221 }, 222 { 223 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, 224 .offset = offsetof(struct flow_keys, addrs.v4addrs), 225 }, 226 { 227 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, 228 .offset = offsetof(struct flow_keys, addrs.v6addrs), 229 }, 230 { 231 .key_id = FLOW_DISSECTOR_KEY_TIPC, 232 .offset = offsetof(struct flow_keys, addrs.tipckey), 233 }, 234 { 235 .key_id = FLOW_DISSECTOR_KEY_PORTS, 236 .offset = offsetof(struct flow_keys, ports), 237 }, 238 { 239 .key_id = FLOW_DISSECTOR_KEY_ICMP, 240 .offset = offsetof(struct flow_keys, icmp), 241 }, 242 { 243 .key_id = FLOW_DISSECTOR_KEY_VLAN, 244 .offset = offsetof(struct flow_keys, vlan), 245 }, 246 { 247 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, 248 .offset = offsetof(struct flow_keys, tags), 249 }, 250 { 251 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, 252 .offset = offsetof(struct flow_keys, keyid), 253 }, 254 }; 255 256 static struct flow_dissector flow_keys_bonding __read_mostly; 257 258 /*-------------------------- Forward declarations ---------------------------*/ 259 260 static int bond_init(struct net_device *bond_dev); 261 static void bond_uninit(struct net_device *bond_dev); 262 static void bond_get_stats(struct net_device *bond_dev, 263 struct rtnl_link_stats64 *stats); 264 static void bond_slave_arr_handler(struct work_struct *work); 265 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 266 int mod); 267 static void bond_netdev_notify_work(struct work_struct *work); 268 269 /*---------------------------- General routines -----------------------------*/ 270 271 const char *bond_mode_name(int mode) 272 { 273 static const char *names[] = { 274 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 275 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 276 [BOND_MODE_XOR] = "load balancing (xor)", 277 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 278 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 279 [BOND_MODE_TLB] = "transmit load balancing", 280 [BOND_MODE_ALB] = "adaptive load balancing", 281 }; 282 283 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 284 return "unknown"; 285 286 return names[mode]; 287 } 288 289 /** 290 * bond_dev_queue_xmit - Prepare skb for xmit. 291 * 292 * @bond: bond device that got this skb for tx. 293 * @skb: hw accel VLAN tagged skb to transmit 294 * @slave_dev: slave that is supposed to xmit this skbuff 295 */ 296 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 297 struct net_device *slave_dev) 298 { 299 skb->dev = slave_dev; 300 301 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 302 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 303 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); 304 305 if (unlikely(netpoll_tx_running(bond->dev))) 306 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 307 308 return dev_queue_xmit(skb); 309 } 310 311 static bool bond_sk_check(struct bonding *bond) 312 { 313 switch (BOND_MODE(bond)) { 314 case BOND_MODE_8023AD: 315 case BOND_MODE_XOR: 316 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) 317 return true; 318 fallthrough; 319 default: 320 return false; 321 } 322 } 323 324 static bool bond_xdp_check(struct bonding *bond) 325 { 326 switch (BOND_MODE(bond)) { 327 case BOND_MODE_ROUNDROBIN: 328 case BOND_MODE_ACTIVEBACKUP: 329 return true; 330 case BOND_MODE_8023AD: 331 case BOND_MODE_XOR: 332 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q 333 * payload is not in the packet due to hardware offload. 334 */ 335 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) 336 return true; 337 fallthrough; 338 default: 339 return false; 340 } 341 } 342 343 /*---------------------------------- VLAN -----------------------------------*/ 344 345 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 346 * We don't protect the slave list iteration with a lock because: 347 * a. This operation is performed in IOCTL context, 348 * b. The operation is protected by the RTNL semaphore in the 8021q code, 349 * c. Holding a lock with BH disabled while directly calling a base driver 350 * entry point is generally a BAD idea. 351 * 352 * The design of synchronization/protection for this operation in the 8021q 353 * module is good for one or more VLAN devices over a single physical device 354 * and cannot be extended for a teaming solution like bonding, so there is a 355 * potential race condition here where a net device from the vlan group might 356 * be referenced (either by a base driver or the 8021q code) while it is being 357 * removed from the system. However, it turns out we're not making matters 358 * worse, and if it works for regular VLAN usage it will work here too. 359 */ 360 361 /** 362 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 363 * @bond_dev: bonding net device that got called 364 * @proto: network protocol ID 365 * @vid: vlan id being added 366 */ 367 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 368 __be16 proto, u16 vid) 369 { 370 struct bonding *bond = netdev_priv(bond_dev); 371 struct slave *slave, *rollback_slave; 372 struct list_head *iter; 373 int res; 374 375 bond_for_each_slave(bond, slave, iter) { 376 res = vlan_vid_add(slave->dev, proto, vid); 377 if (res) 378 goto unwind; 379 } 380 381 return 0; 382 383 unwind: 384 /* unwind to the slave that failed */ 385 bond_for_each_slave(bond, rollback_slave, iter) { 386 if (rollback_slave == slave) 387 break; 388 389 vlan_vid_del(rollback_slave->dev, proto, vid); 390 } 391 392 return res; 393 } 394 395 /** 396 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 397 * @bond_dev: bonding net device that got called 398 * @proto: network protocol ID 399 * @vid: vlan id being removed 400 */ 401 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 402 __be16 proto, u16 vid) 403 { 404 struct bonding *bond = netdev_priv(bond_dev); 405 struct list_head *iter; 406 struct slave *slave; 407 408 bond_for_each_slave(bond, slave, iter) 409 vlan_vid_del(slave->dev, proto, vid); 410 411 if (bond_is_lb(bond)) 412 bond_alb_clear_vlan(bond, vid); 413 414 return 0; 415 } 416 417 /*---------------------------------- XFRM -----------------------------------*/ 418 419 #ifdef CONFIG_XFRM_OFFLOAD 420 /** 421 * bond_ipsec_add_sa - program device with a security association 422 * @xs: pointer to transformer state struct 423 * @extack: extack point to fill failure reason 424 **/ 425 static int bond_ipsec_add_sa(struct xfrm_state *xs, 426 struct netlink_ext_ack *extack) 427 { 428 struct net_device *bond_dev = xs->xso.dev; 429 struct bond_ipsec *ipsec; 430 struct bonding *bond; 431 struct slave *slave; 432 int err; 433 434 if (!bond_dev) 435 return -EINVAL; 436 437 rcu_read_lock(); 438 bond = netdev_priv(bond_dev); 439 slave = rcu_dereference(bond->curr_active_slave); 440 if (!slave) { 441 rcu_read_unlock(); 442 return -ENODEV; 443 } 444 445 if (!slave->dev->xfrmdev_ops || 446 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 447 netif_is_bond_master(slave->dev)) { 448 NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload"); 449 rcu_read_unlock(); 450 return -EINVAL; 451 } 452 453 ipsec = kmalloc(sizeof(*ipsec), GFP_ATOMIC); 454 if (!ipsec) { 455 rcu_read_unlock(); 456 return -ENOMEM; 457 } 458 xs->xso.real_dev = slave->dev; 459 460 err = slave->dev->xfrmdev_ops->xdo_dev_state_add(xs, extack); 461 if (!err) { 462 ipsec->xs = xs; 463 INIT_LIST_HEAD(&ipsec->list); 464 spin_lock_bh(&bond->ipsec_lock); 465 list_add(&ipsec->list, &bond->ipsec_list); 466 spin_unlock_bh(&bond->ipsec_lock); 467 } else { 468 kfree(ipsec); 469 } 470 rcu_read_unlock(); 471 return err; 472 } 473 474 static void bond_ipsec_add_sa_all(struct bonding *bond) 475 { 476 struct net_device *bond_dev = bond->dev; 477 struct bond_ipsec *ipsec; 478 struct slave *slave; 479 480 rcu_read_lock(); 481 slave = rcu_dereference(bond->curr_active_slave); 482 if (!slave) 483 goto out; 484 485 if (!slave->dev->xfrmdev_ops || 486 !slave->dev->xfrmdev_ops->xdo_dev_state_add || 487 netif_is_bond_master(slave->dev)) { 488 spin_lock_bh(&bond->ipsec_lock); 489 if (!list_empty(&bond->ipsec_list)) 490 slave_warn(bond_dev, slave->dev, 491 "%s: no slave xdo_dev_state_add\n", 492 __func__); 493 spin_unlock_bh(&bond->ipsec_lock); 494 goto out; 495 } 496 497 spin_lock_bh(&bond->ipsec_lock); 498 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 499 ipsec->xs->xso.real_dev = slave->dev; 500 if (slave->dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) { 501 slave_warn(bond_dev, slave->dev, "%s: failed to add SA\n", __func__); 502 ipsec->xs->xso.real_dev = NULL; 503 } 504 } 505 spin_unlock_bh(&bond->ipsec_lock); 506 out: 507 rcu_read_unlock(); 508 } 509 510 /** 511 * bond_ipsec_del_sa - clear out this specific SA 512 * @xs: pointer to transformer state struct 513 **/ 514 static void bond_ipsec_del_sa(struct xfrm_state *xs) 515 { 516 struct net_device *bond_dev = xs->xso.dev; 517 struct bond_ipsec *ipsec; 518 struct bonding *bond; 519 struct slave *slave; 520 521 if (!bond_dev) 522 return; 523 524 rcu_read_lock(); 525 bond = netdev_priv(bond_dev); 526 slave = rcu_dereference(bond->curr_active_slave); 527 528 if (!slave) 529 goto out; 530 531 if (!xs->xso.real_dev) 532 goto out; 533 534 WARN_ON(xs->xso.real_dev != slave->dev); 535 536 if (!slave->dev->xfrmdev_ops || 537 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 538 netif_is_bond_master(slave->dev)) { 539 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__); 540 goto out; 541 } 542 543 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs); 544 out: 545 spin_lock_bh(&bond->ipsec_lock); 546 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 547 if (ipsec->xs == xs) { 548 list_del(&ipsec->list); 549 kfree(ipsec); 550 break; 551 } 552 } 553 spin_unlock_bh(&bond->ipsec_lock); 554 rcu_read_unlock(); 555 } 556 557 static void bond_ipsec_del_sa_all(struct bonding *bond) 558 { 559 struct net_device *bond_dev = bond->dev; 560 struct bond_ipsec *ipsec; 561 struct slave *slave; 562 563 rcu_read_lock(); 564 slave = rcu_dereference(bond->curr_active_slave); 565 if (!slave) { 566 rcu_read_unlock(); 567 return; 568 } 569 570 spin_lock_bh(&bond->ipsec_lock); 571 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 572 if (!ipsec->xs->xso.real_dev) 573 continue; 574 575 if (!slave->dev->xfrmdev_ops || 576 !slave->dev->xfrmdev_ops->xdo_dev_state_delete || 577 netif_is_bond_master(slave->dev)) { 578 slave_warn(bond_dev, slave->dev, 579 "%s: no slave xdo_dev_state_delete\n", 580 __func__); 581 } else { 582 slave->dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 583 } 584 ipsec->xs->xso.real_dev = NULL; 585 } 586 spin_unlock_bh(&bond->ipsec_lock); 587 rcu_read_unlock(); 588 } 589 590 /** 591 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 592 * @skb: current data packet 593 * @xs: pointer to transformer state struct 594 **/ 595 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 596 { 597 struct net_device *bond_dev = xs->xso.dev; 598 struct net_device *real_dev; 599 struct slave *curr_active; 600 struct bonding *bond; 601 int err; 602 603 bond = netdev_priv(bond_dev); 604 rcu_read_lock(); 605 curr_active = rcu_dereference(bond->curr_active_slave); 606 real_dev = curr_active->dev; 607 608 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 609 err = false; 610 goto out; 611 } 612 613 if (!xs->xso.real_dev) { 614 err = false; 615 goto out; 616 } 617 618 if (!real_dev->xfrmdev_ops || 619 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 620 netif_is_bond_master(real_dev)) { 621 err = false; 622 goto out; 623 } 624 625 err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 626 out: 627 rcu_read_unlock(); 628 return err; 629 } 630 631 static const struct xfrmdev_ops bond_xfrmdev_ops = { 632 .xdo_dev_state_add = bond_ipsec_add_sa, 633 .xdo_dev_state_delete = bond_ipsec_del_sa, 634 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 635 }; 636 #endif /* CONFIG_XFRM_OFFLOAD */ 637 638 /*------------------------------- Link status -------------------------------*/ 639 640 /* Set the carrier state for the master according to the state of its 641 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 642 * do special 802.3ad magic. 643 * 644 * Returns zero if carrier state does not change, nonzero if it does. 645 */ 646 int bond_set_carrier(struct bonding *bond) 647 { 648 struct list_head *iter; 649 struct slave *slave; 650 651 if (!bond_has_slaves(bond)) 652 goto down; 653 654 if (BOND_MODE(bond) == BOND_MODE_8023AD) 655 return bond_3ad_set_carrier(bond); 656 657 bond_for_each_slave(bond, slave, iter) { 658 if (slave->link == BOND_LINK_UP) { 659 if (!netif_carrier_ok(bond->dev)) { 660 netif_carrier_on(bond->dev); 661 return 1; 662 } 663 return 0; 664 } 665 } 666 667 down: 668 if (netif_carrier_ok(bond->dev)) { 669 netif_carrier_off(bond->dev); 670 return 1; 671 } 672 return 0; 673 } 674 675 /* Get link speed and duplex from the slave's base driver 676 * using ethtool. If for some reason the call fails or the 677 * values are invalid, set speed and duplex to -1, 678 * and return. Return 1 if speed or duplex settings are 679 * UNKNOWN; 0 otherwise. 680 */ 681 static int bond_update_speed_duplex(struct slave *slave) 682 { 683 struct net_device *slave_dev = slave->dev; 684 struct ethtool_link_ksettings ecmd; 685 int res; 686 687 slave->speed = SPEED_UNKNOWN; 688 slave->duplex = DUPLEX_UNKNOWN; 689 690 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 691 if (res < 0) 692 return 1; 693 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 694 return 1; 695 switch (ecmd.base.duplex) { 696 case DUPLEX_FULL: 697 case DUPLEX_HALF: 698 break; 699 default: 700 return 1; 701 } 702 703 slave->speed = ecmd.base.speed; 704 slave->duplex = ecmd.base.duplex; 705 706 return 0; 707 } 708 709 const char *bond_slave_link_status(s8 link) 710 { 711 switch (link) { 712 case BOND_LINK_UP: 713 return "up"; 714 case BOND_LINK_FAIL: 715 return "going down"; 716 case BOND_LINK_DOWN: 717 return "down"; 718 case BOND_LINK_BACK: 719 return "going back"; 720 default: 721 return "unknown"; 722 } 723 } 724 725 /* if <dev> supports MII link status reporting, check its link status. 726 * 727 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 728 * depending upon the setting of the use_carrier parameter. 729 * 730 * Return either BMSR_LSTATUS, meaning that the link is up (or we 731 * can't tell and just pretend it is), or 0, meaning that the link is 732 * down. 733 * 734 * If reporting is non-zero, instead of faking link up, return -1 if 735 * both ETHTOOL and MII ioctls fail (meaning the device does not 736 * support them). If use_carrier is set, return whatever it says. 737 * It'd be nice if there was a good way to tell if a driver supports 738 * netif_carrier, but there really isn't. 739 */ 740 static int bond_check_dev_link(struct bonding *bond, 741 struct net_device *slave_dev, int reporting) 742 { 743 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 744 int (*ioctl)(struct net_device *, struct ifreq *, int); 745 struct ifreq ifr; 746 struct mii_ioctl_data *mii; 747 748 if (!reporting && !netif_running(slave_dev)) 749 return 0; 750 751 if (bond->params.use_carrier) 752 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 753 754 /* Try to get link status using Ethtool first. */ 755 if (slave_dev->ethtool_ops->get_link) 756 return slave_dev->ethtool_ops->get_link(slave_dev) ? 757 BMSR_LSTATUS : 0; 758 759 /* Ethtool can't be used, fallback to MII ioctls. */ 760 ioctl = slave_ops->ndo_eth_ioctl; 761 if (ioctl) { 762 /* TODO: set pointer to correct ioctl on a per team member 763 * bases to make this more efficient. that is, once 764 * we determine the correct ioctl, we will always 765 * call it and not the others for that team 766 * member. 767 */ 768 769 /* We cannot assume that SIOCGMIIPHY will also read a 770 * register; not all network drivers (e.g., e100) 771 * support that. 772 */ 773 774 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 775 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 776 mii = if_mii(&ifr); 777 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 778 mii->reg_num = MII_BMSR; 779 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 780 return mii->val_out & BMSR_LSTATUS; 781 } 782 } 783 784 /* If reporting, report that either there's no ndo_eth_ioctl, 785 * or both SIOCGMIIREG and get_link failed (meaning that we 786 * cannot report link status). If not reporting, pretend 787 * we're ok. 788 */ 789 return reporting ? -1 : BMSR_LSTATUS; 790 } 791 792 /*----------------------------- Multicast list ------------------------------*/ 793 794 /* Push the promiscuity flag down to appropriate slaves */ 795 static int bond_set_promiscuity(struct bonding *bond, int inc) 796 { 797 struct list_head *iter; 798 int err = 0; 799 800 if (bond_uses_primary(bond)) { 801 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 802 803 if (curr_active) 804 err = dev_set_promiscuity(curr_active->dev, inc); 805 } else { 806 struct slave *slave; 807 808 bond_for_each_slave(bond, slave, iter) { 809 err = dev_set_promiscuity(slave->dev, inc); 810 if (err) 811 return err; 812 } 813 } 814 return err; 815 } 816 817 /* Push the allmulti flag down to all slaves */ 818 static int bond_set_allmulti(struct bonding *bond, int inc) 819 { 820 struct list_head *iter; 821 int err = 0; 822 823 if (bond_uses_primary(bond)) { 824 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 825 826 if (curr_active) 827 err = dev_set_allmulti(curr_active->dev, inc); 828 } else { 829 struct slave *slave; 830 831 bond_for_each_slave(bond, slave, iter) { 832 err = dev_set_allmulti(slave->dev, inc); 833 if (err) 834 return err; 835 } 836 } 837 return err; 838 } 839 840 /* Retrieve the list of registered multicast addresses for the bonding 841 * device and retransmit an IGMP JOIN request to the current active 842 * slave. 843 */ 844 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 845 { 846 struct bonding *bond = container_of(work, struct bonding, 847 mcast_work.work); 848 849 if (!rtnl_trylock()) { 850 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 851 return; 852 } 853 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 854 855 if (bond->igmp_retrans > 1) { 856 bond->igmp_retrans--; 857 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 858 } 859 rtnl_unlock(); 860 } 861 862 /* Flush bond's hardware addresses from slave */ 863 static void bond_hw_addr_flush(struct net_device *bond_dev, 864 struct net_device *slave_dev) 865 { 866 struct bonding *bond = netdev_priv(bond_dev); 867 868 dev_uc_unsync(slave_dev, bond_dev); 869 dev_mc_unsync(slave_dev, bond_dev); 870 871 if (BOND_MODE(bond) == BOND_MODE_8023AD) 872 dev_mc_del(slave_dev, lacpdu_mcast_addr); 873 } 874 875 /*--------------------------- Active slave change ---------------------------*/ 876 877 /* Update the hardware address list and promisc/allmulti for the new and 878 * old active slaves (if any). Modes that are not using primary keep all 879 * slaves up date at all times; only the modes that use primary need to call 880 * this function to swap these settings during a failover. 881 */ 882 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 883 struct slave *old_active) 884 { 885 if (old_active) { 886 if (bond->dev->flags & IFF_PROMISC) 887 dev_set_promiscuity(old_active->dev, -1); 888 889 if (bond->dev->flags & IFF_ALLMULTI) 890 dev_set_allmulti(old_active->dev, -1); 891 892 if (bond->dev->flags & IFF_UP) 893 bond_hw_addr_flush(bond->dev, old_active->dev); 894 } 895 896 if (new_active) { 897 /* FIXME: Signal errors upstream. */ 898 if (bond->dev->flags & IFF_PROMISC) 899 dev_set_promiscuity(new_active->dev, 1); 900 901 if (bond->dev->flags & IFF_ALLMULTI) 902 dev_set_allmulti(new_active->dev, 1); 903 904 if (bond->dev->flags & IFF_UP) { 905 netif_addr_lock_bh(bond->dev); 906 dev_uc_sync(new_active->dev, bond->dev); 907 dev_mc_sync(new_active->dev, bond->dev); 908 netif_addr_unlock_bh(bond->dev); 909 } 910 } 911 } 912 913 /** 914 * bond_set_dev_addr - clone slave's address to bond 915 * @bond_dev: bond net device 916 * @slave_dev: slave net device 917 * 918 * Should be called with RTNL held. 919 */ 920 static int bond_set_dev_addr(struct net_device *bond_dev, 921 struct net_device *slave_dev) 922 { 923 int err; 924 925 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 926 bond_dev, slave_dev, slave_dev->addr_len); 927 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 928 if (err) 929 return err; 930 931 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 932 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 933 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 934 return 0; 935 } 936 937 static struct slave *bond_get_old_active(struct bonding *bond, 938 struct slave *new_active) 939 { 940 struct slave *slave; 941 struct list_head *iter; 942 943 bond_for_each_slave(bond, slave, iter) { 944 if (slave == new_active) 945 continue; 946 947 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 948 return slave; 949 } 950 951 return NULL; 952 } 953 954 /* bond_do_fail_over_mac 955 * 956 * Perform special MAC address swapping for fail_over_mac settings 957 * 958 * Called with RTNL 959 */ 960 static void bond_do_fail_over_mac(struct bonding *bond, 961 struct slave *new_active, 962 struct slave *old_active) 963 { 964 u8 tmp_mac[MAX_ADDR_LEN]; 965 struct sockaddr_storage ss; 966 int rv; 967 968 switch (bond->params.fail_over_mac) { 969 case BOND_FOM_ACTIVE: 970 if (new_active) { 971 rv = bond_set_dev_addr(bond->dev, new_active->dev); 972 if (rv) 973 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 974 -rv); 975 } 976 break; 977 case BOND_FOM_FOLLOW: 978 /* if new_active && old_active, swap them 979 * if just old_active, do nothing (going to no active slave) 980 * if just new_active, set new_active to bond's MAC 981 */ 982 if (!new_active) 983 return; 984 985 if (!old_active) 986 old_active = bond_get_old_active(bond, new_active); 987 988 if (old_active) { 989 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 990 new_active->dev->addr_len); 991 bond_hw_addr_copy(ss.__data, 992 old_active->dev->dev_addr, 993 old_active->dev->addr_len); 994 ss.ss_family = new_active->dev->type; 995 } else { 996 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 997 bond->dev->addr_len); 998 ss.ss_family = bond->dev->type; 999 } 1000 1001 rv = dev_set_mac_address(new_active->dev, 1002 (struct sockaddr *)&ss, NULL); 1003 if (rv) { 1004 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1005 -rv); 1006 goto out; 1007 } 1008 1009 if (!old_active) 1010 goto out; 1011 1012 bond_hw_addr_copy(ss.__data, tmp_mac, 1013 new_active->dev->addr_len); 1014 ss.ss_family = old_active->dev->type; 1015 1016 rv = dev_set_mac_address(old_active->dev, 1017 (struct sockaddr *)&ss, NULL); 1018 if (rv) 1019 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1020 -rv); 1021 out: 1022 break; 1023 default: 1024 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1025 bond->params.fail_over_mac); 1026 break; 1027 } 1028 1029 } 1030 1031 /** 1032 * bond_choose_primary_or_current - select the primary or high priority slave 1033 * @bond: our bonding struct 1034 * 1035 * - Check if there is a primary link. If the primary link was set and is up, 1036 * go on and do link reselection. 1037 * 1038 * - If primary link is not set or down, find the highest priority link. 1039 * If the highest priority link is not current slave, set it as primary 1040 * link and do link reselection. 1041 */ 1042 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1043 { 1044 struct slave *prim = rtnl_dereference(bond->primary_slave); 1045 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1046 struct slave *slave, *hprio = NULL; 1047 struct list_head *iter; 1048 1049 if (!prim || prim->link != BOND_LINK_UP) { 1050 bond_for_each_slave(bond, slave, iter) { 1051 if (slave->link == BOND_LINK_UP) { 1052 hprio = hprio ?: slave; 1053 if (slave->prio > hprio->prio) 1054 hprio = slave; 1055 } 1056 } 1057 1058 if (hprio && hprio != curr) { 1059 prim = hprio; 1060 goto link_reselect; 1061 } 1062 1063 if (!curr || curr->link != BOND_LINK_UP) 1064 return NULL; 1065 return curr; 1066 } 1067 1068 if (bond->force_primary) { 1069 bond->force_primary = false; 1070 return prim; 1071 } 1072 1073 link_reselect: 1074 if (!curr || curr->link != BOND_LINK_UP) 1075 return prim; 1076 1077 /* At this point, prim and curr are both up */ 1078 switch (bond->params.primary_reselect) { 1079 case BOND_PRI_RESELECT_ALWAYS: 1080 return prim; 1081 case BOND_PRI_RESELECT_BETTER: 1082 if (prim->speed < curr->speed) 1083 return curr; 1084 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1085 return curr; 1086 return prim; 1087 case BOND_PRI_RESELECT_FAILURE: 1088 return curr; 1089 default: 1090 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1091 bond->params.primary_reselect); 1092 return curr; 1093 } 1094 } 1095 1096 /** 1097 * bond_find_best_slave - select the best available slave to be the active one 1098 * @bond: our bonding struct 1099 */ 1100 static struct slave *bond_find_best_slave(struct bonding *bond) 1101 { 1102 struct slave *slave, *bestslave = NULL; 1103 struct list_head *iter; 1104 int mintime = bond->params.updelay; 1105 1106 slave = bond_choose_primary_or_current(bond); 1107 if (slave) 1108 return slave; 1109 1110 bond_for_each_slave(bond, slave, iter) { 1111 if (slave->link == BOND_LINK_UP) 1112 return slave; 1113 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1114 slave->delay < mintime) { 1115 mintime = slave->delay; 1116 bestslave = slave; 1117 } 1118 } 1119 1120 return bestslave; 1121 } 1122 1123 static bool bond_should_notify_peers(struct bonding *bond) 1124 { 1125 struct slave *slave; 1126 1127 rcu_read_lock(); 1128 slave = rcu_dereference(bond->curr_active_slave); 1129 rcu_read_unlock(); 1130 1131 if (!slave || !bond->send_peer_notif || 1132 bond->send_peer_notif % 1133 max(1, bond->params.peer_notif_delay) != 0 || 1134 !netif_carrier_ok(bond->dev) || 1135 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1136 return false; 1137 1138 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1139 slave ? slave->dev->name : "NULL"); 1140 1141 return true; 1142 } 1143 1144 /** 1145 * bond_change_active_slave - change the active slave into the specified one 1146 * @bond: our bonding struct 1147 * @new_active: the new slave to make the active one 1148 * 1149 * Set the new slave to the bond's settings and unset them on the old 1150 * curr_active_slave. 1151 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1152 * 1153 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1154 * because it is apparently the best available slave we have, even though its 1155 * updelay hasn't timed out yet. 1156 * 1157 * Caller must hold RTNL. 1158 */ 1159 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1160 { 1161 struct slave *old_active; 1162 1163 ASSERT_RTNL(); 1164 1165 old_active = rtnl_dereference(bond->curr_active_slave); 1166 1167 if (old_active == new_active) 1168 return; 1169 1170 #ifdef CONFIG_XFRM_OFFLOAD 1171 bond_ipsec_del_sa_all(bond); 1172 #endif /* CONFIG_XFRM_OFFLOAD */ 1173 1174 if (new_active) { 1175 new_active->last_link_up = jiffies; 1176 1177 if (new_active->link == BOND_LINK_BACK) { 1178 if (bond_uses_primary(bond)) { 1179 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1180 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1181 } 1182 1183 new_active->delay = 0; 1184 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1185 BOND_SLAVE_NOTIFY_NOW); 1186 1187 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1188 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1189 1190 if (bond_is_lb(bond)) 1191 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1192 } else { 1193 if (bond_uses_primary(bond)) 1194 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1195 } 1196 } 1197 1198 if (bond_uses_primary(bond)) 1199 bond_hw_addr_swap(bond, new_active, old_active); 1200 1201 if (bond_is_lb(bond)) { 1202 bond_alb_handle_active_change(bond, new_active); 1203 if (old_active) 1204 bond_set_slave_inactive_flags(old_active, 1205 BOND_SLAVE_NOTIFY_NOW); 1206 if (new_active) 1207 bond_set_slave_active_flags(new_active, 1208 BOND_SLAVE_NOTIFY_NOW); 1209 } else { 1210 rcu_assign_pointer(bond->curr_active_slave, new_active); 1211 } 1212 1213 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1214 if (old_active) 1215 bond_set_slave_inactive_flags(old_active, 1216 BOND_SLAVE_NOTIFY_NOW); 1217 1218 if (new_active) { 1219 bool should_notify_peers = false; 1220 1221 bond_set_slave_active_flags(new_active, 1222 BOND_SLAVE_NOTIFY_NOW); 1223 1224 if (bond->params.fail_over_mac) 1225 bond_do_fail_over_mac(bond, new_active, 1226 old_active); 1227 1228 if (netif_running(bond->dev)) { 1229 bond->send_peer_notif = 1230 bond->params.num_peer_notif * 1231 max(1, bond->params.peer_notif_delay); 1232 should_notify_peers = 1233 bond_should_notify_peers(bond); 1234 } 1235 1236 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1237 if (should_notify_peers) { 1238 bond->send_peer_notif--; 1239 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1240 bond->dev); 1241 } 1242 } 1243 } 1244 1245 #ifdef CONFIG_XFRM_OFFLOAD 1246 bond_ipsec_add_sa_all(bond); 1247 #endif /* CONFIG_XFRM_OFFLOAD */ 1248 1249 /* resend IGMP joins since active slave has changed or 1250 * all were sent on curr_active_slave. 1251 * resend only if bond is brought up with the affected 1252 * bonding modes and the retransmission is enabled 1253 */ 1254 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1255 ((bond_uses_primary(bond) && new_active) || 1256 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1257 bond->igmp_retrans = bond->params.resend_igmp; 1258 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1259 } 1260 } 1261 1262 /** 1263 * bond_select_active_slave - select a new active slave, if needed 1264 * @bond: our bonding struct 1265 * 1266 * This functions should be called when one of the following occurs: 1267 * - The old curr_active_slave has been released or lost its link. 1268 * - The primary_slave has got its link back. 1269 * - A slave has got its link back and there's no old curr_active_slave. 1270 * 1271 * Caller must hold RTNL. 1272 */ 1273 void bond_select_active_slave(struct bonding *bond) 1274 { 1275 struct slave *best_slave; 1276 int rv; 1277 1278 ASSERT_RTNL(); 1279 1280 best_slave = bond_find_best_slave(bond); 1281 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1282 bond_change_active_slave(bond, best_slave); 1283 rv = bond_set_carrier(bond); 1284 if (!rv) 1285 return; 1286 1287 if (netif_carrier_ok(bond->dev)) 1288 netdev_info(bond->dev, "active interface up!\n"); 1289 else 1290 netdev_info(bond->dev, "now running without any active interface!\n"); 1291 } 1292 } 1293 1294 #ifdef CONFIG_NET_POLL_CONTROLLER 1295 static inline int slave_enable_netpoll(struct slave *slave) 1296 { 1297 struct netpoll *np; 1298 int err = 0; 1299 1300 np = kzalloc(sizeof(*np), GFP_KERNEL); 1301 err = -ENOMEM; 1302 if (!np) 1303 goto out; 1304 1305 err = __netpoll_setup(np, slave->dev); 1306 if (err) { 1307 kfree(np); 1308 goto out; 1309 } 1310 slave->np = np; 1311 out: 1312 return err; 1313 } 1314 static inline void slave_disable_netpoll(struct slave *slave) 1315 { 1316 struct netpoll *np = slave->np; 1317 1318 if (!np) 1319 return; 1320 1321 slave->np = NULL; 1322 1323 __netpoll_free(np); 1324 } 1325 1326 static void bond_poll_controller(struct net_device *bond_dev) 1327 { 1328 struct bonding *bond = netdev_priv(bond_dev); 1329 struct slave *slave = NULL; 1330 struct list_head *iter; 1331 struct ad_info ad_info; 1332 1333 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1334 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1335 return; 1336 1337 bond_for_each_slave_rcu(bond, slave, iter) { 1338 if (!bond_slave_is_up(slave)) 1339 continue; 1340 1341 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1342 struct aggregator *agg = 1343 SLAVE_AD_INFO(slave)->port.aggregator; 1344 1345 if (agg && 1346 agg->aggregator_identifier != ad_info.aggregator_id) 1347 continue; 1348 } 1349 1350 netpoll_poll_dev(slave->dev); 1351 } 1352 } 1353 1354 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1355 { 1356 struct bonding *bond = netdev_priv(bond_dev); 1357 struct list_head *iter; 1358 struct slave *slave; 1359 1360 bond_for_each_slave(bond, slave, iter) 1361 if (bond_slave_is_up(slave)) 1362 slave_disable_netpoll(slave); 1363 } 1364 1365 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1366 { 1367 struct bonding *bond = netdev_priv(dev); 1368 struct list_head *iter; 1369 struct slave *slave; 1370 int err = 0; 1371 1372 bond_for_each_slave(bond, slave, iter) { 1373 err = slave_enable_netpoll(slave); 1374 if (err) { 1375 bond_netpoll_cleanup(dev); 1376 break; 1377 } 1378 } 1379 return err; 1380 } 1381 #else 1382 static inline int slave_enable_netpoll(struct slave *slave) 1383 { 1384 return 0; 1385 } 1386 static inline void slave_disable_netpoll(struct slave *slave) 1387 { 1388 } 1389 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1390 { 1391 } 1392 #endif 1393 1394 /*---------------------------------- IOCTL ----------------------------------*/ 1395 1396 static netdev_features_t bond_fix_features(struct net_device *dev, 1397 netdev_features_t features) 1398 { 1399 struct bonding *bond = netdev_priv(dev); 1400 struct list_head *iter; 1401 netdev_features_t mask; 1402 struct slave *slave; 1403 1404 mask = features; 1405 1406 features &= ~NETIF_F_ONE_FOR_ALL; 1407 features |= NETIF_F_ALL_FOR_ALL; 1408 1409 bond_for_each_slave(bond, slave, iter) { 1410 features = netdev_increment_features(features, 1411 slave->dev->features, 1412 mask); 1413 } 1414 features = netdev_add_tso_features(features, mask); 1415 1416 return features; 1417 } 1418 1419 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1420 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1421 NETIF_F_HIGHDMA | NETIF_F_LRO) 1422 1423 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1424 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1425 1426 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1427 NETIF_F_GSO_SOFTWARE) 1428 1429 1430 static void bond_compute_features(struct bonding *bond) 1431 { 1432 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1433 IFF_XMIT_DST_RELEASE_PERM; 1434 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1435 netdev_features_t enc_features = BOND_ENC_FEATURES; 1436 #ifdef CONFIG_XFRM_OFFLOAD 1437 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1438 #endif /* CONFIG_XFRM_OFFLOAD */ 1439 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1440 struct net_device *bond_dev = bond->dev; 1441 struct list_head *iter; 1442 struct slave *slave; 1443 unsigned short max_hard_header_len = ETH_HLEN; 1444 unsigned int tso_max_size = TSO_MAX_SIZE; 1445 u16 tso_max_segs = TSO_MAX_SEGS; 1446 1447 if (!bond_has_slaves(bond)) 1448 goto done; 1449 vlan_features &= NETIF_F_ALL_FOR_ALL; 1450 mpls_features &= NETIF_F_ALL_FOR_ALL; 1451 1452 bond_for_each_slave(bond, slave, iter) { 1453 vlan_features = netdev_increment_features(vlan_features, 1454 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1455 1456 enc_features = netdev_increment_features(enc_features, 1457 slave->dev->hw_enc_features, 1458 BOND_ENC_FEATURES); 1459 1460 #ifdef CONFIG_XFRM_OFFLOAD 1461 xfrm_features = netdev_increment_features(xfrm_features, 1462 slave->dev->hw_enc_features, 1463 BOND_XFRM_FEATURES); 1464 #endif /* CONFIG_XFRM_OFFLOAD */ 1465 1466 mpls_features = netdev_increment_features(mpls_features, 1467 slave->dev->mpls_features, 1468 BOND_MPLS_FEATURES); 1469 1470 dst_release_flag &= slave->dev->priv_flags; 1471 if (slave->dev->hard_header_len > max_hard_header_len) 1472 max_hard_header_len = slave->dev->hard_header_len; 1473 1474 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1475 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1476 } 1477 bond_dev->hard_header_len = max_hard_header_len; 1478 1479 done: 1480 bond_dev->vlan_features = vlan_features; 1481 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1482 NETIF_F_HW_VLAN_CTAG_TX | 1483 NETIF_F_HW_VLAN_STAG_TX; 1484 #ifdef CONFIG_XFRM_OFFLOAD 1485 bond_dev->hw_enc_features |= xfrm_features; 1486 #endif /* CONFIG_XFRM_OFFLOAD */ 1487 bond_dev->mpls_features = mpls_features; 1488 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1489 netif_set_tso_max_size(bond_dev, tso_max_size); 1490 1491 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1492 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1493 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1494 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1495 1496 netdev_change_features(bond_dev); 1497 } 1498 1499 static void bond_setup_by_slave(struct net_device *bond_dev, 1500 struct net_device *slave_dev) 1501 { 1502 bond_dev->header_ops = slave_dev->header_ops; 1503 1504 bond_dev->type = slave_dev->type; 1505 bond_dev->hard_header_len = slave_dev->hard_header_len; 1506 bond_dev->needed_headroom = slave_dev->needed_headroom; 1507 bond_dev->addr_len = slave_dev->addr_len; 1508 1509 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1510 slave_dev->addr_len); 1511 } 1512 1513 /* On bonding slaves other than the currently active slave, suppress 1514 * duplicates except for alb non-mcast/bcast. 1515 */ 1516 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1517 struct slave *slave, 1518 struct bonding *bond) 1519 { 1520 if (bond_is_slave_inactive(slave)) { 1521 if (BOND_MODE(bond) == BOND_MODE_ALB && 1522 skb->pkt_type != PACKET_BROADCAST && 1523 skb->pkt_type != PACKET_MULTICAST) 1524 return false; 1525 return true; 1526 } 1527 return false; 1528 } 1529 1530 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1531 { 1532 struct sk_buff *skb = *pskb; 1533 struct slave *slave; 1534 struct bonding *bond; 1535 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1536 struct slave *); 1537 int ret = RX_HANDLER_ANOTHER; 1538 1539 skb = skb_share_check(skb, GFP_ATOMIC); 1540 if (unlikely(!skb)) 1541 return RX_HANDLER_CONSUMED; 1542 1543 *pskb = skb; 1544 1545 slave = bond_slave_get_rcu(skb->dev); 1546 bond = slave->bond; 1547 1548 recv_probe = READ_ONCE(bond->recv_probe); 1549 if (recv_probe) { 1550 ret = recv_probe(skb, bond, slave); 1551 if (ret == RX_HANDLER_CONSUMED) { 1552 consume_skb(skb); 1553 return ret; 1554 } 1555 } 1556 1557 /* 1558 * For packets determined by bond_should_deliver_exact_match() call to 1559 * be suppressed we want to make an exception for link-local packets. 1560 * This is necessary for e.g. LLDP daemons to be able to monitor 1561 * inactive slave links without being forced to bind to them 1562 * explicitly. 1563 * 1564 * At the same time, packets that are passed to the bonding master 1565 * (including link-local ones) can have their originating interface 1566 * determined via PACKET_ORIGDEV socket option. 1567 */ 1568 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1569 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1570 return RX_HANDLER_PASS; 1571 return RX_HANDLER_EXACT; 1572 } 1573 1574 skb->dev = bond->dev; 1575 1576 if (BOND_MODE(bond) == BOND_MODE_ALB && 1577 netif_is_bridge_port(bond->dev) && 1578 skb->pkt_type == PACKET_HOST) { 1579 1580 if (unlikely(skb_cow_head(skb, 1581 skb->data - skb_mac_header(skb)))) { 1582 kfree_skb(skb); 1583 return RX_HANDLER_CONSUMED; 1584 } 1585 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1586 bond->dev->addr_len); 1587 } 1588 1589 return ret; 1590 } 1591 1592 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1593 { 1594 switch (BOND_MODE(bond)) { 1595 case BOND_MODE_ROUNDROBIN: 1596 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1597 case BOND_MODE_ACTIVEBACKUP: 1598 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1599 case BOND_MODE_BROADCAST: 1600 return NETDEV_LAG_TX_TYPE_BROADCAST; 1601 case BOND_MODE_XOR: 1602 case BOND_MODE_8023AD: 1603 return NETDEV_LAG_TX_TYPE_HASH; 1604 default: 1605 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1606 } 1607 } 1608 1609 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1610 enum netdev_lag_tx_type type) 1611 { 1612 if (type != NETDEV_LAG_TX_TYPE_HASH) 1613 return NETDEV_LAG_HASH_NONE; 1614 1615 switch (bond->params.xmit_policy) { 1616 case BOND_XMIT_POLICY_LAYER2: 1617 return NETDEV_LAG_HASH_L2; 1618 case BOND_XMIT_POLICY_LAYER34: 1619 return NETDEV_LAG_HASH_L34; 1620 case BOND_XMIT_POLICY_LAYER23: 1621 return NETDEV_LAG_HASH_L23; 1622 case BOND_XMIT_POLICY_ENCAP23: 1623 return NETDEV_LAG_HASH_E23; 1624 case BOND_XMIT_POLICY_ENCAP34: 1625 return NETDEV_LAG_HASH_E34; 1626 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1627 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1628 default: 1629 return NETDEV_LAG_HASH_UNKNOWN; 1630 } 1631 } 1632 1633 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1634 struct netlink_ext_ack *extack) 1635 { 1636 struct netdev_lag_upper_info lag_upper_info; 1637 enum netdev_lag_tx_type type; 1638 int err; 1639 1640 type = bond_lag_tx_type(bond); 1641 lag_upper_info.tx_type = type; 1642 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1643 1644 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1645 &lag_upper_info, extack); 1646 if (err) 1647 return err; 1648 1649 slave->dev->flags |= IFF_SLAVE; 1650 return 0; 1651 } 1652 1653 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1654 { 1655 netdev_upper_dev_unlink(slave->dev, bond->dev); 1656 slave->dev->flags &= ~IFF_SLAVE; 1657 } 1658 1659 static void slave_kobj_release(struct kobject *kobj) 1660 { 1661 struct slave *slave = to_slave(kobj); 1662 struct bonding *bond = bond_get_bond_by_slave(slave); 1663 1664 cancel_delayed_work_sync(&slave->notify_work); 1665 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1666 kfree(SLAVE_AD_INFO(slave)); 1667 1668 kfree(slave); 1669 } 1670 1671 static struct kobj_type slave_ktype = { 1672 .release = slave_kobj_release, 1673 #ifdef CONFIG_SYSFS 1674 .sysfs_ops = &slave_sysfs_ops, 1675 #endif 1676 }; 1677 1678 static int bond_kobj_init(struct slave *slave) 1679 { 1680 int err; 1681 1682 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1683 &(slave->dev->dev.kobj), "bonding_slave"); 1684 if (err) 1685 kobject_put(&slave->kobj); 1686 1687 return err; 1688 } 1689 1690 static struct slave *bond_alloc_slave(struct bonding *bond, 1691 struct net_device *slave_dev) 1692 { 1693 struct slave *slave = NULL; 1694 1695 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1696 if (!slave) 1697 return NULL; 1698 1699 slave->bond = bond; 1700 slave->dev = slave_dev; 1701 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1702 1703 if (bond_kobj_init(slave)) 1704 return NULL; 1705 1706 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1707 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1708 GFP_KERNEL); 1709 if (!SLAVE_AD_INFO(slave)) { 1710 kobject_put(&slave->kobj); 1711 return NULL; 1712 } 1713 } 1714 1715 return slave; 1716 } 1717 1718 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1719 { 1720 info->bond_mode = BOND_MODE(bond); 1721 info->miimon = bond->params.miimon; 1722 info->num_slaves = bond->slave_cnt; 1723 } 1724 1725 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1726 { 1727 strcpy(info->slave_name, slave->dev->name); 1728 info->link = slave->link; 1729 info->state = bond_slave_state(slave); 1730 info->link_failure_count = slave->link_failure_count; 1731 } 1732 1733 static void bond_netdev_notify_work(struct work_struct *_work) 1734 { 1735 struct slave *slave = container_of(_work, struct slave, 1736 notify_work.work); 1737 1738 if (rtnl_trylock()) { 1739 struct netdev_bonding_info binfo; 1740 1741 bond_fill_ifslave(slave, &binfo.slave); 1742 bond_fill_ifbond(slave->bond, &binfo.master); 1743 netdev_bonding_info_change(slave->dev, &binfo); 1744 rtnl_unlock(); 1745 } else { 1746 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1747 } 1748 } 1749 1750 void bond_queue_slave_event(struct slave *slave) 1751 { 1752 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1753 } 1754 1755 void bond_lower_state_changed(struct slave *slave) 1756 { 1757 struct netdev_lag_lower_state_info info; 1758 1759 info.link_up = slave->link == BOND_LINK_UP || 1760 slave->link == BOND_LINK_FAIL; 1761 info.tx_enabled = bond_is_active_slave(slave); 1762 netdev_lower_state_changed(slave->dev, &info); 1763 } 1764 1765 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1766 if (extack) \ 1767 NL_SET_ERR_MSG(extack, errmsg); \ 1768 else \ 1769 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1770 } while (0) 1771 1772 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1773 if (extack) \ 1774 NL_SET_ERR_MSG(extack, errmsg); \ 1775 else \ 1776 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1777 } while (0) 1778 1779 /* The bonding driver uses ether_setup() to convert a master bond device 1780 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always 1781 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP 1782 * if they were set 1783 */ 1784 static void bond_ether_setup(struct net_device *bond_dev) 1785 { 1786 unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP); 1787 1788 ether_setup(bond_dev); 1789 bond_dev->flags |= IFF_MASTER | flags; 1790 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1791 } 1792 1793 void bond_xdp_set_features(struct net_device *bond_dev) 1794 { 1795 struct bonding *bond = netdev_priv(bond_dev); 1796 xdp_features_t val = NETDEV_XDP_ACT_MASK; 1797 struct list_head *iter; 1798 struct slave *slave; 1799 1800 ASSERT_RTNL(); 1801 1802 if (!bond_xdp_check(bond)) { 1803 xdp_clear_features_flag(bond_dev); 1804 return; 1805 } 1806 1807 bond_for_each_slave(bond, slave, iter) 1808 val &= slave->dev->xdp_features; 1809 1810 xdp_set_features_flag(bond_dev, val); 1811 } 1812 1813 /* enslave device <slave> to bond device <master> */ 1814 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1815 struct netlink_ext_ack *extack) 1816 { 1817 struct bonding *bond = netdev_priv(bond_dev); 1818 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1819 struct slave *new_slave = NULL, *prev_slave; 1820 struct sockaddr_storage ss; 1821 int link_reporting; 1822 int res = 0, i; 1823 1824 if (slave_dev->flags & IFF_MASTER && 1825 !netif_is_bond_master(slave_dev)) { 1826 BOND_NL_ERR(bond_dev, extack, 1827 "Device type (master device) cannot be enslaved"); 1828 return -EPERM; 1829 } 1830 1831 if (!bond->params.use_carrier && 1832 slave_dev->ethtool_ops->get_link == NULL && 1833 slave_ops->ndo_eth_ioctl == NULL) { 1834 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1835 } 1836 1837 /* already in-use? */ 1838 if (netdev_is_rx_handler_busy(slave_dev)) { 1839 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1840 "Device is in use and cannot be enslaved"); 1841 return -EBUSY; 1842 } 1843 1844 if (bond_dev == slave_dev) { 1845 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1846 return -EPERM; 1847 } 1848 1849 /* vlan challenged mutual exclusion */ 1850 /* no need to lock since we're protected by rtnl_lock */ 1851 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1852 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1853 if (vlan_uses_dev(bond_dev)) { 1854 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1855 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1856 return -EPERM; 1857 } else { 1858 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1859 } 1860 } else { 1861 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1862 } 1863 1864 if (slave_dev->features & NETIF_F_HW_ESP) 1865 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1866 1867 /* Old ifenslave binaries are no longer supported. These can 1868 * be identified with moderate accuracy by the state of the slave: 1869 * the current ifenslave will set the interface down prior to 1870 * enslaving it; the old ifenslave will not. 1871 */ 1872 if (slave_dev->flags & IFF_UP) { 1873 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1874 "Device can not be enslaved while up"); 1875 return -EPERM; 1876 } 1877 1878 /* set bonding device ether type by slave - bonding netdevices are 1879 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1880 * there is a need to override some of the type dependent attribs/funcs. 1881 * 1882 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1883 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1884 */ 1885 if (!bond_has_slaves(bond)) { 1886 if (bond_dev->type != slave_dev->type) { 1887 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1888 bond_dev->type, slave_dev->type); 1889 1890 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1891 bond_dev); 1892 res = notifier_to_errno(res); 1893 if (res) { 1894 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1895 return -EBUSY; 1896 } 1897 1898 /* Flush unicast and multicast addresses */ 1899 dev_uc_flush(bond_dev); 1900 dev_mc_flush(bond_dev); 1901 1902 if (slave_dev->type != ARPHRD_ETHER) 1903 bond_setup_by_slave(bond_dev, slave_dev); 1904 else 1905 bond_ether_setup(bond_dev); 1906 1907 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1908 bond_dev); 1909 } 1910 } else if (bond_dev->type != slave_dev->type) { 1911 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1912 "Device type is different from other slaves"); 1913 return -EINVAL; 1914 } 1915 1916 if (slave_dev->type == ARPHRD_INFINIBAND && 1917 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1918 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1919 "Only active-backup mode is supported for infiniband slaves"); 1920 res = -EOPNOTSUPP; 1921 goto err_undo_flags; 1922 } 1923 1924 if (!slave_ops->ndo_set_mac_address || 1925 slave_dev->type == ARPHRD_INFINIBAND) { 1926 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1927 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1928 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1929 if (!bond_has_slaves(bond)) { 1930 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1931 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1932 } else { 1933 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1934 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1935 res = -EOPNOTSUPP; 1936 goto err_undo_flags; 1937 } 1938 } 1939 } 1940 1941 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1942 1943 /* If this is the first slave, then we need to set the master's hardware 1944 * address to be the same as the slave's. 1945 */ 1946 if (!bond_has_slaves(bond) && 1947 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 1948 res = bond_set_dev_addr(bond->dev, slave_dev); 1949 if (res) 1950 goto err_undo_flags; 1951 } 1952 1953 new_slave = bond_alloc_slave(bond, slave_dev); 1954 if (!new_slave) { 1955 res = -ENOMEM; 1956 goto err_undo_flags; 1957 } 1958 1959 /* Set the new_slave's queue_id to be zero. Queue ID mapping 1960 * is set via sysfs or module option if desired. 1961 */ 1962 new_slave->queue_id = 0; 1963 1964 /* Save slave's original mtu and then set it to match the bond */ 1965 new_slave->original_mtu = slave_dev->mtu; 1966 res = dev_set_mtu(slave_dev, bond->dev->mtu); 1967 if (res) { 1968 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 1969 goto err_free; 1970 } 1971 1972 /* Save slave's original ("permanent") mac address for modes 1973 * that need it, and for restoring it upon release, and then 1974 * set it to the master's address 1975 */ 1976 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 1977 slave_dev->addr_len); 1978 1979 if (!bond->params.fail_over_mac || 1980 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1981 /* Set slave to master's mac address. The application already 1982 * set the master's mac address to that of the first slave 1983 */ 1984 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 1985 ss.ss_family = slave_dev->type; 1986 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 1987 extack); 1988 if (res) { 1989 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 1990 goto err_restore_mtu; 1991 } 1992 } 1993 1994 /* set no_addrconf flag before open to prevent IPv6 addrconf */ 1995 slave_dev->priv_flags |= IFF_NO_ADDRCONF; 1996 1997 /* open the slave since the application closed it */ 1998 res = dev_open(slave_dev, extack); 1999 if (res) { 2000 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 2001 goto err_restore_mac; 2002 } 2003 2004 slave_dev->priv_flags |= IFF_BONDING; 2005 /* initialize slave stats */ 2006 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 2007 2008 if (bond_is_lb(bond)) { 2009 /* bond_alb_init_slave() must be called before all other stages since 2010 * it might fail and we do not want to have to undo everything 2011 */ 2012 res = bond_alb_init_slave(bond, new_slave); 2013 if (res) 2014 goto err_close; 2015 } 2016 2017 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 2018 if (res) { 2019 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 2020 goto err_close; 2021 } 2022 2023 prev_slave = bond_last_slave(bond); 2024 2025 new_slave->delay = 0; 2026 new_slave->link_failure_count = 0; 2027 2028 if (bond_update_speed_duplex(new_slave) && 2029 bond_needs_speed_duplex(bond)) 2030 new_slave->link = BOND_LINK_DOWN; 2031 2032 new_slave->last_rx = jiffies - 2033 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2034 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2035 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2036 2037 new_slave->last_tx = new_slave->last_rx; 2038 2039 if (bond->params.miimon && !bond->params.use_carrier) { 2040 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2041 2042 if ((link_reporting == -1) && !bond->params.arp_interval) { 2043 /* miimon is set but a bonded network driver 2044 * does not support ETHTOOL/MII and 2045 * arp_interval is not set. Note: if 2046 * use_carrier is enabled, we will never go 2047 * here (because netif_carrier is always 2048 * supported); thus, we don't need to change 2049 * the messages for netif_carrier. 2050 */ 2051 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"); 2052 } else if (link_reporting == -1) { 2053 /* unable get link status using mii/ethtool */ 2054 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"); 2055 } 2056 } 2057 2058 /* check for initial state */ 2059 new_slave->link = BOND_LINK_NOCHANGE; 2060 if (bond->params.miimon) { 2061 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2062 if (bond->params.updelay) { 2063 bond_set_slave_link_state(new_slave, 2064 BOND_LINK_BACK, 2065 BOND_SLAVE_NOTIFY_NOW); 2066 new_slave->delay = bond->params.updelay; 2067 } else { 2068 bond_set_slave_link_state(new_slave, 2069 BOND_LINK_UP, 2070 BOND_SLAVE_NOTIFY_NOW); 2071 } 2072 } else { 2073 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2074 BOND_SLAVE_NOTIFY_NOW); 2075 } 2076 } else if (bond->params.arp_interval) { 2077 bond_set_slave_link_state(new_slave, 2078 (netif_carrier_ok(slave_dev) ? 2079 BOND_LINK_UP : BOND_LINK_DOWN), 2080 BOND_SLAVE_NOTIFY_NOW); 2081 } else { 2082 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2083 BOND_SLAVE_NOTIFY_NOW); 2084 } 2085 2086 if (new_slave->link != BOND_LINK_DOWN) 2087 new_slave->last_link_up = jiffies; 2088 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2089 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2090 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2091 2092 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2093 /* if there is a primary slave, remember it */ 2094 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2095 rcu_assign_pointer(bond->primary_slave, new_slave); 2096 bond->force_primary = true; 2097 } 2098 } 2099 2100 switch (BOND_MODE(bond)) { 2101 case BOND_MODE_ACTIVEBACKUP: 2102 bond_set_slave_inactive_flags(new_slave, 2103 BOND_SLAVE_NOTIFY_NOW); 2104 break; 2105 case BOND_MODE_8023AD: 2106 /* in 802.3ad mode, the internal mechanism 2107 * will activate the slaves in the selected 2108 * aggregator 2109 */ 2110 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2111 /* if this is the first slave */ 2112 if (!prev_slave) { 2113 SLAVE_AD_INFO(new_slave)->id = 1; 2114 /* Initialize AD with the number of times that the AD timer is called in 1 second 2115 * can be called only after the mac address of the bond is set 2116 */ 2117 bond_3ad_initialize(bond); 2118 } else { 2119 SLAVE_AD_INFO(new_slave)->id = 2120 SLAVE_AD_INFO(prev_slave)->id + 1; 2121 } 2122 2123 bond_3ad_bind_slave(new_slave); 2124 break; 2125 case BOND_MODE_TLB: 2126 case BOND_MODE_ALB: 2127 bond_set_active_slave(new_slave); 2128 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2129 break; 2130 default: 2131 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2132 2133 /* always active in trunk mode */ 2134 bond_set_active_slave(new_slave); 2135 2136 /* In trunking mode there is little meaning to curr_active_slave 2137 * anyway (it holds no special properties of the bond device), 2138 * so we can change it without calling change_active_interface() 2139 */ 2140 if (!rcu_access_pointer(bond->curr_active_slave) && 2141 new_slave->link == BOND_LINK_UP) 2142 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2143 2144 break; 2145 } /* switch(bond_mode) */ 2146 2147 #ifdef CONFIG_NET_POLL_CONTROLLER 2148 if (bond->dev->npinfo) { 2149 if (slave_enable_netpoll(new_slave)) { 2150 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2151 res = -EBUSY; 2152 goto err_detach; 2153 } 2154 } 2155 #endif 2156 2157 if (!(bond_dev->features & NETIF_F_LRO)) 2158 dev_disable_lro(slave_dev); 2159 2160 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2161 new_slave); 2162 if (res) { 2163 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2164 goto err_detach; 2165 } 2166 2167 res = bond_master_upper_dev_link(bond, new_slave, extack); 2168 if (res) { 2169 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2170 goto err_unregister; 2171 } 2172 2173 bond_lower_state_changed(new_slave); 2174 2175 res = bond_sysfs_slave_add(new_slave); 2176 if (res) { 2177 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2178 goto err_upper_unlink; 2179 } 2180 2181 /* If the mode uses primary, then the following is handled by 2182 * bond_change_active_slave(). 2183 */ 2184 if (!bond_uses_primary(bond)) { 2185 /* set promiscuity level to new slave */ 2186 if (bond_dev->flags & IFF_PROMISC) { 2187 res = dev_set_promiscuity(slave_dev, 1); 2188 if (res) 2189 goto err_sysfs_del; 2190 } 2191 2192 /* set allmulti level to new slave */ 2193 if (bond_dev->flags & IFF_ALLMULTI) { 2194 res = dev_set_allmulti(slave_dev, 1); 2195 if (res) { 2196 if (bond_dev->flags & IFF_PROMISC) 2197 dev_set_promiscuity(slave_dev, -1); 2198 goto err_sysfs_del; 2199 } 2200 } 2201 2202 if (bond_dev->flags & IFF_UP) { 2203 netif_addr_lock_bh(bond_dev); 2204 dev_mc_sync_multiple(slave_dev, bond_dev); 2205 dev_uc_sync_multiple(slave_dev, bond_dev); 2206 netif_addr_unlock_bh(bond_dev); 2207 2208 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2209 dev_mc_add(slave_dev, lacpdu_mcast_addr); 2210 } 2211 } 2212 2213 bond->slave_cnt++; 2214 bond_compute_features(bond); 2215 bond_set_carrier(bond); 2216 2217 if (bond_uses_primary(bond)) { 2218 block_netpoll_tx(); 2219 bond_select_active_slave(bond); 2220 unblock_netpoll_tx(); 2221 } 2222 2223 if (bond_mode_can_use_xmit_hash(bond)) 2224 bond_update_slave_arr(bond, NULL); 2225 2226 2227 if (!slave_dev->netdev_ops->ndo_bpf || 2228 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2229 if (bond->xdp_prog) { 2230 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2231 "Slave does not support XDP"); 2232 res = -EOPNOTSUPP; 2233 goto err_sysfs_del; 2234 } 2235 } else if (bond->xdp_prog) { 2236 struct netdev_bpf xdp = { 2237 .command = XDP_SETUP_PROG, 2238 .flags = 0, 2239 .prog = bond->xdp_prog, 2240 .extack = extack, 2241 }; 2242 2243 if (dev_xdp_prog_count(slave_dev) > 0) { 2244 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2245 "Slave has XDP program loaded, please unload before enslaving"); 2246 res = -EOPNOTSUPP; 2247 goto err_sysfs_del; 2248 } 2249 2250 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2251 if (res < 0) { 2252 /* ndo_bpf() sets extack error message */ 2253 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2254 goto err_sysfs_del; 2255 } 2256 if (bond->xdp_prog) 2257 bpf_prog_inc(bond->xdp_prog); 2258 } 2259 2260 bond_xdp_set_features(bond_dev); 2261 2262 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2263 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2264 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2265 2266 /* enslave is successful */ 2267 bond_queue_slave_event(new_slave); 2268 return 0; 2269 2270 /* Undo stages on error */ 2271 err_sysfs_del: 2272 bond_sysfs_slave_del(new_slave); 2273 2274 err_upper_unlink: 2275 bond_upper_dev_unlink(bond, new_slave); 2276 2277 err_unregister: 2278 netdev_rx_handler_unregister(slave_dev); 2279 2280 err_detach: 2281 vlan_vids_del_by_dev(slave_dev, bond_dev); 2282 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2283 RCU_INIT_POINTER(bond->primary_slave, NULL); 2284 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2285 block_netpoll_tx(); 2286 bond_change_active_slave(bond, NULL); 2287 bond_select_active_slave(bond); 2288 unblock_netpoll_tx(); 2289 } 2290 /* either primary_slave or curr_active_slave might've changed */ 2291 synchronize_rcu(); 2292 slave_disable_netpoll(new_slave); 2293 2294 err_close: 2295 if (!netif_is_bond_master(slave_dev)) 2296 slave_dev->priv_flags &= ~IFF_BONDING; 2297 dev_close(slave_dev); 2298 2299 err_restore_mac: 2300 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2301 if (!bond->params.fail_over_mac || 2302 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2303 /* XXX TODO - fom follow mode needs to change master's 2304 * MAC if this slave's MAC is in use by the bond, or at 2305 * least print a warning. 2306 */ 2307 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2308 new_slave->dev->addr_len); 2309 ss.ss_family = slave_dev->type; 2310 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2311 } 2312 2313 err_restore_mtu: 2314 dev_set_mtu(slave_dev, new_slave->original_mtu); 2315 2316 err_free: 2317 kobject_put(&new_slave->kobj); 2318 2319 err_undo_flags: 2320 /* Enslave of first slave has failed and we need to fix master's mac */ 2321 if (!bond_has_slaves(bond)) { 2322 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2323 slave_dev->dev_addr)) 2324 eth_hw_addr_random(bond_dev); 2325 if (bond_dev->type != ARPHRD_ETHER) { 2326 dev_close(bond_dev); 2327 bond_ether_setup(bond_dev); 2328 } 2329 } 2330 2331 return res; 2332 } 2333 2334 /* Try to release the slave device <slave> from the bond device <master> 2335 * It is legal to access curr_active_slave without a lock because all the function 2336 * is RTNL-locked. If "all" is true it means that the function is being called 2337 * while destroying a bond interface and all slaves are being released. 2338 * 2339 * The rules for slave state should be: 2340 * for Active/Backup: 2341 * Active stays on all backups go down 2342 * for Bonded connections: 2343 * The first up interface should be left on and all others downed. 2344 */ 2345 static int __bond_release_one(struct net_device *bond_dev, 2346 struct net_device *slave_dev, 2347 bool all, bool unregister) 2348 { 2349 struct bonding *bond = netdev_priv(bond_dev); 2350 struct slave *slave, *oldcurrent; 2351 struct sockaddr_storage ss; 2352 int old_flags = bond_dev->flags; 2353 netdev_features_t old_features = bond_dev->features; 2354 2355 /* slave is not a slave or master is not master of this slave */ 2356 if (!(slave_dev->flags & IFF_SLAVE) || 2357 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2358 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2359 return -EINVAL; 2360 } 2361 2362 block_netpoll_tx(); 2363 2364 slave = bond_get_slave_by_dev(bond, slave_dev); 2365 if (!slave) { 2366 /* not a slave of this bond */ 2367 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2368 unblock_netpoll_tx(); 2369 return -EINVAL; 2370 } 2371 2372 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2373 2374 bond_sysfs_slave_del(slave); 2375 2376 /* recompute stats just before removing the slave */ 2377 bond_get_stats(bond->dev, &bond->bond_stats); 2378 2379 if (bond->xdp_prog) { 2380 struct netdev_bpf xdp = { 2381 .command = XDP_SETUP_PROG, 2382 .flags = 0, 2383 .prog = NULL, 2384 .extack = NULL, 2385 }; 2386 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2387 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2388 } 2389 2390 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2391 * for this slave anymore. 2392 */ 2393 netdev_rx_handler_unregister(slave_dev); 2394 2395 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2396 bond_3ad_unbind_slave(slave); 2397 2398 bond_upper_dev_unlink(bond, slave); 2399 2400 if (bond_mode_can_use_xmit_hash(bond)) 2401 bond_update_slave_arr(bond, slave); 2402 2403 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2404 bond_is_active_slave(slave) ? "active" : "backup"); 2405 2406 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2407 2408 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2409 2410 if (!all && (!bond->params.fail_over_mac || 2411 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2412 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2413 bond_has_slaves(bond)) 2414 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", 2415 slave->perm_hwaddr); 2416 } 2417 2418 if (rtnl_dereference(bond->primary_slave) == slave) 2419 RCU_INIT_POINTER(bond->primary_slave, NULL); 2420 2421 if (oldcurrent == slave) 2422 bond_change_active_slave(bond, NULL); 2423 2424 if (bond_is_lb(bond)) { 2425 /* Must be called only after the slave has been 2426 * detached from the list and the curr_active_slave 2427 * has been cleared (if our_slave == old_current), 2428 * but before a new active slave is selected. 2429 */ 2430 bond_alb_deinit_slave(bond, slave); 2431 } 2432 2433 if (all) { 2434 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2435 } else if (oldcurrent == slave) { 2436 /* Note that we hold RTNL over this sequence, so there 2437 * is no concern that another slave add/remove event 2438 * will interfere. 2439 */ 2440 bond_select_active_slave(bond); 2441 } 2442 2443 bond_set_carrier(bond); 2444 if (!bond_has_slaves(bond)) 2445 eth_hw_addr_random(bond_dev); 2446 2447 unblock_netpoll_tx(); 2448 synchronize_rcu(); 2449 bond->slave_cnt--; 2450 2451 if (!bond_has_slaves(bond)) { 2452 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2453 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2454 } 2455 2456 bond_compute_features(bond); 2457 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2458 (old_features & NETIF_F_VLAN_CHALLENGED)) 2459 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2460 2461 vlan_vids_del_by_dev(slave_dev, bond_dev); 2462 2463 /* If the mode uses primary, then this case was handled above by 2464 * bond_change_active_slave(..., NULL) 2465 */ 2466 if (!bond_uses_primary(bond)) { 2467 /* unset promiscuity level from slave 2468 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2469 * of the IFF_PROMISC flag in the bond_dev, but we need the 2470 * value of that flag before that change, as that was the value 2471 * when this slave was attached, so we cache at the start of the 2472 * function and use it here. Same goes for ALLMULTI below 2473 */ 2474 if (old_flags & IFF_PROMISC) 2475 dev_set_promiscuity(slave_dev, -1); 2476 2477 /* unset allmulti level from slave */ 2478 if (old_flags & IFF_ALLMULTI) 2479 dev_set_allmulti(slave_dev, -1); 2480 2481 if (old_flags & IFF_UP) 2482 bond_hw_addr_flush(bond_dev, slave_dev); 2483 } 2484 2485 slave_disable_netpoll(slave); 2486 2487 /* close slave before restoring its mac address */ 2488 dev_close(slave_dev); 2489 2490 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2491 2492 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2493 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2494 /* restore original ("permanent") mac address */ 2495 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2496 slave->dev->addr_len); 2497 ss.ss_family = slave_dev->type; 2498 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2499 } 2500 2501 if (unregister) 2502 __dev_set_mtu(slave_dev, slave->original_mtu); 2503 else 2504 dev_set_mtu(slave_dev, slave->original_mtu); 2505 2506 if (!netif_is_bond_master(slave_dev)) 2507 slave_dev->priv_flags &= ~IFF_BONDING; 2508 2509 bond_xdp_set_features(bond_dev); 2510 kobject_put(&slave->kobj); 2511 2512 return 0; 2513 } 2514 2515 /* A wrapper used because of ndo_del_link */ 2516 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2517 { 2518 return __bond_release_one(bond_dev, slave_dev, false, false); 2519 } 2520 2521 /* First release a slave and then destroy the bond if no more slaves are left. 2522 * Must be under rtnl_lock when this function is called. 2523 */ 2524 static int bond_release_and_destroy(struct net_device *bond_dev, 2525 struct net_device *slave_dev) 2526 { 2527 struct bonding *bond = netdev_priv(bond_dev); 2528 int ret; 2529 2530 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2531 if (ret == 0 && !bond_has_slaves(bond) && 2532 bond_dev->reg_state != NETREG_UNREGISTERING) { 2533 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2534 netdev_info(bond_dev, "Destroying bond\n"); 2535 bond_remove_proc_entry(bond); 2536 unregister_netdevice(bond_dev); 2537 } 2538 return ret; 2539 } 2540 2541 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2542 { 2543 struct bonding *bond = netdev_priv(bond_dev); 2544 2545 bond_fill_ifbond(bond, info); 2546 } 2547 2548 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2549 { 2550 struct bonding *bond = netdev_priv(bond_dev); 2551 struct list_head *iter; 2552 int i = 0, res = -ENODEV; 2553 struct slave *slave; 2554 2555 bond_for_each_slave(bond, slave, iter) { 2556 if (i++ == (int)info->slave_id) { 2557 res = 0; 2558 bond_fill_ifslave(slave, info); 2559 break; 2560 } 2561 } 2562 2563 return res; 2564 } 2565 2566 /*-------------------------------- Monitoring -------------------------------*/ 2567 2568 /* called with rcu_read_lock() */ 2569 static int bond_miimon_inspect(struct bonding *bond) 2570 { 2571 bool ignore_updelay = false; 2572 int link_state, commit = 0; 2573 struct list_head *iter; 2574 struct slave *slave; 2575 2576 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 2577 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2578 } else { 2579 struct bond_up_slave *usable_slaves; 2580 2581 usable_slaves = rcu_dereference(bond->usable_slaves); 2582 2583 if (usable_slaves && usable_slaves->count == 0) 2584 ignore_updelay = true; 2585 } 2586 2587 bond_for_each_slave_rcu(bond, slave, iter) { 2588 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2589 2590 link_state = bond_check_dev_link(bond, slave->dev, 0); 2591 2592 switch (slave->link) { 2593 case BOND_LINK_UP: 2594 if (link_state) 2595 continue; 2596 2597 bond_propose_link_state(slave, BOND_LINK_FAIL); 2598 commit++; 2599 slave->delay = bond->params.downdelay; 2600 if (slave->delay) { 2601 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2602 (BOND_MODE(bond) == 2603 BOND_MODE_ACTIVEBACKUP) ? 2604 (bond_is_active_slave(slave) ? 2605 "active " : "backup ") : "", 2606 bond->params.downdelay * bond->params.miimon); 2607 } 2608 fallthrough; 2609 case BOND_LINK_FAIL: 2610 if (link_state) { 2611 /* recovered before downdelay expired */ 2612 bond_propose_link_state(slave, BOND_LINK_UP); 2613 slave->last_link_up = jiffies; 2614 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2615 (bond->params.downdelay - slave->delay) * 2616 bond->params.miimon); 2617 commit++; 2618 continue; 2619 } 2620 2621 if (slave->delay <= 0) { 2622 bond_propose_link_state(slave, BOND_LINK_DOWN); 2623 commit++; 2624 continue; 2625 } 2626 2627 slave->delay--; 2628 break; 2629 2630 case BOND_LINK_DOWN: 2631 if (!link_state) 2632 continue; 2633 2634 bond_propose_link_state(slave, BOND_LINK_BACK); 2635 commit++; 2636 slave->delay = bond->params.updelay; 2637 2638 if (slave->delay) { 2639 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2640 ignore_updelay ? 0 : 2641 bond->params.updelay * 2642 bond->params.miimon); 2643 } 2644 fallthrough; 2645 case BOND_LINK_BACK: 2646 if (!link_state) { 2647 bond_propose_link_state(slave, BOND_LINK_DOWN); 2648 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2649 (bond->params.updelay - slave->delay) * 2650 bond->params.miimon); 2651 commit++; 2652 continue; 2653 } 2654 2655 if (ignore_updelay) 2656 slave->delay = 0; 2657 2658 if (slave->delay <= 0) { 2659 bond_propose_link_state(slave, BOND_LINK_UP); 2660 commit++; 2661 ignore_updelay = false; 2662 continue; 2663 } 2664 2665 slave->delay--; 2666 break; 2667 } 2668 } 2669 2670 return commit; 2671 } 2672 2673 static void bond_miimon_link_change(struct bonding *bond, 2674 struct slave *slave, 2675 char link) 2676 { 2677 switch (BOND_MODE(bond)) { 2678 case BOND_MODE_8023AD: 2679 bond_3ad_handle_link_change(slave, link); 2680 break; 2681 case BOND_MODE_TLB: 2682 case BOND_MODE_ALB: 2683 bond_alb_handle_link_change(bond, slave, link); 2684 break; 2685 case BOND_MODE_XOR: 2686 bond_update_slave_arr(bond, NULL); 2687 break; 2688 } 2689 } 2690 2691 static void bond_miimon_commit(struct bonding *bond) 2692 { 2693 struct slave *slave, *primary, *active; 2694 bool do_failover = false; 2695 struct list_head *iter; 2696 2697 ASSERT_RTNL(); 2698 2699 bond_for_each_slave(bond, slave, iter) { 2700 switch (slave->link_new_state) { 2701 case BOND_LINK_NOCHANGE: 2702 /* For 802.3ad mode, check current slave speed and 2703 * duplex again in case its port was disabled after 2704 * invalid speed/duplex reporting but recovered before 2705 * link monitoring could make a decision on the actual 2706 * link status 2707 */ 2708 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2709 slave->link == BOND_LINK_UP) 2710 bond_3ad_adapter_speed_duplex_changed(slave); 2711 continue; 2712 2713 case BOND_LINK_UP: 2714 if (bond_update_speed_duplex(slave) && 2715 bond_needs_speed_duplex(bond)) { 2716 slave->link = BOND_LINK_DOWN; 2717 if (net_ratelimit()) 2718 slave_warn(bond->dev, slave->dev, 2719 "failed to get link speed/duplex\n"); 2720 continue; 2721 } 2722 bond_set_slave_link_state(slave, BOND_LINK_UP, 2723 BOND_SLAVE_NOTIFY_NOW); 2724 slave->last_link_up = jiffies; 2725 2726 primary = rtnl_dereference(bond->primary_slave); 2727 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2728 /* prevent it from being the active one */ 2729 bond_set_backup_slave(slave); 2730 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2731 /* make it immediately active */ 2732 bond_set_active_slave(slave); 2733 } 2734 2735 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2736 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2737 slave->duplex ? "full" : "half"); 2738 2739 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2740 2741 active = rtnl_dereference(bond->curr_active_slave); 2742 if (!active || slave == primary || slave->prio > active->prio) 2743 do_failover = true; 2744 2745 continue; 2746 2747 case BOND_LINK_DOWN: 2748 if (slave->link_failure_count < UINT_MAX) 2749 slave->link_failure_count++; 2750 2751 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2752 BOND_SLAVE_NOTIFY_NOW); 2753 2754 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2755 BOND_MODE(bond) == BOND_MODE_8023AD) 2756 bond_set_slave_inactive_flags(slave, 2757 BOND_SLAVE_NOTIFY_NOW); 2758 2759 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2760 2761 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2762 2763 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2764 do_failover = true; 2765 2766 continue; 2767 2768 default: 2769 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2770 slave->link_new_state); 2771 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2772 2773 continue; 2774 } 2775 } 2776 2777 if (do_failover) { 2778 block_netpoll_tx(); 2779 bond_select_active_slave(bond); 2780 unblock_netpoll_tx(); 2781 } 2782 2783 bond_set_carrier(bond); 2784 } 2785 2786 /* bond_mii_monitor 2787 * 2788 * Really a wrapper that splits the mii monitor into two phases: an 2789 * inspection, then (if inspection indicates something needs to be done) 2790 * an acquisition of appropriate locks followed by a commit phase to 2791 * implement whatever link state changes are indicated. 2792 */ 2793 static void bond_mii_monitor(struct work_struct *work) 2794 { 2795 struct bonding *bond = container_of(work, struct bonding, 2796 mii_work.work); 2797 bool should_notify_peers = false; 2798 bool commit; 2799 unsigned long delay; 2800 struct slave *slave; 2801 struct list_head *iter; 2802 2803 delay = msecs_to_jiffies(bond->params.miimon); 2804 2805 if (!bond_has_slaves(bond)) 2806 goto re_arm; 2807 2808 rcu_read_lock(); 2809 should_notify_peers = bond_should_notify_peers(bond); 2810 commit = !!bond_miimon_inspect(bond); 2811 if (bond->send_peer_notif) { 2812 rcu_read_unlock(); 2813 if (rtnl_trylock()) { 2814 bond->send_peer_notif--; 2815 rtnl_unlock(); 2816 } 2817 } else { 2818 rcu_read_unlock(); 2819 } 2820 2821 if (commit) { 2822 /* Race avoidance with bond_close cancel of workqueue */ 2823 if (!rtnl_trylock()) { 2824 delay = 1; 2825 should_notify_peers = false; 2826 goto re_arm; 2827 } 2828 2829 bond_for_each_slave(bond, slave, iter) { 2830 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2831 } 2832 bond_miimon_commit(bond); 2833 2834 rtnl_unlock(); /* might sleep, hold no other locks */ 2835 } 2836 2837 re_arm: 2838 if (bond->params.miimon) 2839 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2840 2841 if (should_notify_peers) { 2842 if (!rtnl_trylock()) 2843 return; 2844 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2845 rtnl_unlock(); 2846 } 2847 } 2848 2849 static int bond_upper_dev_walk(struct net_device *upper, 2850 struct netdev_nested_priv *priv) 2851 { 2852 __be32 ip = *(__be32 *)priv->data; 2853 2854 return ip == bond_confirm_addr(upper, 0, ip); 2855 } 2856 2857 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2858 { 2859 struct netdev_nested_priv priv = { 2860 .data = (void *)&ip, 2861 }; 2862 bool ret = false; 2863 2864 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2865 return true; 2866 2867 rcu_read_lock(); 2868 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2869 ret = true; 2870 rcu_read_unlock(); 2871 2872 return ret; 2873 } 2874 2875 #define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff) 2876 2877 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2878 struct sk_buff *skb) 2879 { 2880 struct net_device *bond_dev = slave->bond->dev; 2881 struct net_device *slave_dev = slave->dev; 2882 struct bond_vlan_tag *outer_tag = tags; 2883 2884 if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE) 2885 return true; 2886 2887 tags++; 2888 2889 /* Go through all the tags backwards and add them to the packet */ 2890 while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) { 2891 if (!tags->vlan_id) { 2892 tags++; 2893 continue; 2894 } 2895 2896 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2897 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2898 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2899 tags->vlan_id); 2900 if (!skb) { 2901 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2902 return false; 2903 } 2904 2905 tags++; 2906 } 2907 /* Set the outer tag */ 2908 if (outer_tag->vlan_id) { 2909 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2910 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2911 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2912 outer_tag->vlan_id); 2913 } 2914 2915 return true; 2916 } 2917 2918 /* We go to the (large) trouble of VLAN tagging ARP frames because 2919 * switches in VLAN mode (especially if ports are configured as 2920 * "native" to a VLAN) might not pass non-tagged frames. 2921 */ 2922 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2923 __be32 src_ip, struct bond_vlan_tag *tags) 2924 { 2925 struct net_device *bond_dev = slave->bond->dev; 2926 struct net_device *slave_dev = slave->dev; 2927 struct sk_buff *skb; 2928 2929 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2930 arp_op, &dest_ip, &src_ip); 2931 2932 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2933 NULL, slave_dev->dev_addr, NULL); 2934 2935 if (!skb) { 2936 net_err_ratelimited("ARP packet allocation failed\n"); 2937 return; 2938 } 2939 2940 if (bond_handle_vlan(slave, tags, skb)) { 2941 slave_update_last_tx(slave); 2942 arp_xmit(skb); 2943 } 2944 2945 return; 2946 } 2947 2948 /* Validate the device path between the @start_dev and the @end_dev. 2949 * The path is valid if the @end_dev is reachable through device 2950 * stacking. 2951 * When the path is validated, collect any vlan information in the 2952 * path. 2953 */ 2954 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 2955 struct net_device *end_dev, 2956 int level) 2957 { 2958 struct bond_vlan_tag *tags; 2959 struct net_device *upper; 2960 struct list_head *iter; 2961 2962 if (start_dev == end_dev) { 2963 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 2964 if (!tags) 2965 return ERR_PTR(-ENOMEM); 2966 tags[level].vlan_proto = BOND_VLAN_PROTO_NONE; 2967 return tags; 2968 } 2969 2970 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 2971 tags = bond_verify_device_path(upper, end_dev, level + 1); 2972 if (IS_ERR_OR_NULL(tags)) { 2973 if (IS_ERR(tags)) 2974 return tags; 2975 continue; 2976 } 2977 if (is_vlan_dev(upper)) { 2978 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 2979 tags[level].vlan_id = vlan_dev_vlan_id(upper); 2980 } 2981 2982 return tags; 2983 } 2984 2985 return NULL; 2986 } 2987 2988 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 2989 { 2990 struct rtable *rt; 2991 struct bond_vlan_tag *tags; 2992 __be32 *targets = bond->params.arp_targets, addr; 2993 int i; 2994 2995 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 2996 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 2997 __func__, &targets[i]); 2998 tags = NULL; 2999 3000 /* Find out through which dev should the packet go */ 3001 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 3002 RTO_ONLINK, 0); 3003 if (IS_ERR(rt)) { 3004 /* there's no route to target - try to send arp 3005 * probe to generate any traffic (arp_validate=0) 3006 */ 3007 if (bond->params.arp_validate) 3008 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 3009 bond->dev->name, 3010 &targets[i]); 3011 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 3012 0, tags); 3013 continue; 3014 } 3015 3016 /* bond device itself */ 3017 if (rt->dst.dev == bond->dev) 3018 goto found; 3019 3020 rcu_read_lock(); 3021 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 3022 rcu_read_unlock(); 3023 3024 if (!IS_ERR_OR_NULL(tags)) 3025 goto found; 3026 3027 /* Not our device - skip */ 3028 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 3029 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 3030 3031 ip_rt_put(rt); 3032 continue; 3033 3034 found: 3035 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 3036 ip_rt_put(rt); 3037 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 3038 kfree(tags); 3039 } 3040 } 3041 3042 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 3043 { 3044 int i; 3045 3046 if (!sip || !bond_has_this_ip(bond, tip)) { 3047 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 3048 __func__, &sip, &tip); 3049 return; 3050 } 3051 3052 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3053 if (i == -1) { 3054 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3055 __func__, &sip); 3056 return; 3057 } 3058 slave->last_rx = jiffies; 3059 slave->target_last_arp_rx[i] = jiffies; 3060 } 3061 3062 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3063 struct slave *slave) 3064 { 3065 struct arphdr *arp = (struct arphdr *)skb->data; 3066 struct slave *curr_active_slave, *curr_arp_slave; 3067 unsigned char *arp_ptr; 3068 __be32 sip, tip; 3069 unsigned int alen; 3070 3071 alen = arp_hdr_len(bond->dev); 3072 3073 if (alen > skb_headlen(skb)) { 3074 arp = kmalloc(alen, GFP_ATOMIC); 3075 if (!arp) 3076 goto out_unlock; 3077 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3078 goto out_unlock; 3079 } 3080 3081 if (arp->ar_hln != bond->dev->addr_len || 3082 skb->pkt_type == PACKET_OTHERHOST || 3083 skb->pkt_type == PACKET_LOOPBACK || 3084 arp->ar_hrd != htons(ARPHRD_ETHER) || 3085 arp->ar_pro != htons(ETH_P_IP) || 3086 arp->ar_pln != 4) 3087 goto out_unlock; 3088 3089 arp_ptr = (unsigned char *)(arp + 1); 3090 arp_ptr += bond->dev->addr_len; 3091 memcpy(&sip, arp_ptr, 4); 3092 arp_ptr += 4 + bond->dev->addr_len; 3093 memcpy(&tip, arp_ptr, 4); 3094 3095 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3096 __func__, slave->dev->name, bond_slave_state(slave), 3097 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3098 &sip, &tip); 3099 3100 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3101 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3102 3103 /* We 'trust' the received ARP enough to validate it if: 3104 * 3105 * (a) the slave receiving the ARP is active (which includes the 3106 * current ARP slave, if any), or 3107 * 3108 * (b) the receiving slave isn't active, but there is a currently 3109 * active slave and it received valid arp reply(s) after it became 3110 * the currently active slave, or 3111 * 3112 * (c) there is an ARP slave that sent an ARP during the prior ARP 3113 * interval, and we receive an ARP reply on any slave. We accept 3114 * these because switch FDB update delays may deliver the ARP 3115 * reply to a slave other than the sender of the ARP request. 3116 * 3117 * Note: for (b), backup slaves are receiving the broadcast ARP 3118 * request, not a reply. This request passes from the sending 3119 * slave through the L2 switch(es) to the receiving slave. Since 3120 * this is checking the request, sip/tip are swapped for 3121 * validation. 3122 * 3123 * This is done to avoid endless looping when we can't reach the 3124 * arp_ip_target and fool ourselves with our own arp requests. 3125 */ 3126 if (bond_is_active_slave(slave)) 3127 bond_validate_arp(bond, slave, sip, tip); 3128 else if (curr_active_slave && 3129 time_after(slave_last_rx(bond, curr_active_slave), 3130 curr_active_slave->last_link_up)) 3131 bond_validate_arp(bond, slave, tip, sip); 3132 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3133 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3134 bond_validate_arp(bond, slave, sip, tip); 3135 3136 out_unlock: 3137 if (arp != (struct arphdr *)skb->data) 3138 kfree(arp); 3139 return RX_HANDLER_ANOTHER; 3140 } 3141 3142 #if IS_ENABLED(CONFIG_IPV6) 3143 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3144 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3145 { 3146 struct net_device *bond_dev = slave->bond->dev; 3147 struct net_device *slave_dev = slave->dev; 3148 struct in6_addr mcaddr; 3149 struct sk_buff *skb; 3150 3151 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3152 daddr, saddr); 3153 3154 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3155 if (!skb) { 3156 net_err_ratelimited("NS packet allocation failed\n"); 3157 return; 3158 } 3159 3160 addrconf_addr_solict_mult(daddr, &mcaddr); 3161 if (bond_handle_vlan(slave, tags, skb)) { 3162 slave_update_last_tx(slave); 3163 ndisc_send_skb(skb, &mcaddr, saddr); 3164 } 3165 } 3166 3167 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3168 { 3169 struct in6_addr *targets = bond->params.ns_targets; 3170 struct bond_vlan_tag *tags; 3171 struct dst_entry *dst; 3172 struct in6_addr saddr; 3173 struct flowi6 fl6; 3174 int i; 3175 3176 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3177 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3178 __func__, &targets[i]); 3179 tags = NULL; 3180 3181 /* Find out through which dev should the packet go */ 3182 memset(&fl6, 0, sizeof(struct flowi6)); 3183 fl6.daddr = targets[i]; 3184 fl6.flowi6_oif = bond->dev->ifindex; 3185 3186 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3187 if (dst->error) { 3188 dst_release(dst); 3189 /* there's no route to target - try to send arp 3190 * probe to generate any traffic (arp_validate=0) 3191 */ 3192 if (bond->params.arp_validate) 3193 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3194 bond->dev->name, 3195 &targets[i]); 3196 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3197 continue; 3198 } 3199 3200 /* bond device itself */ 3201 if (dst->dev == bond->dev) 3202 goto found; 3203 3204 rcu_read_lock(); 3205 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3206 rcu_read_unlock(); 3207 3208 if (!IS_ERR_OR_NULL(tags)) 3209 goto found; 3210 3211 /* Not our device - skip */ 3212 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3213 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3214 3215 dst_release(dst); 3216 continue; 3217 3218 found: 3219 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3220 bond_ns_send(slave, &targets[i], &saddr, tags); 3221 else 3222 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3223 3224 dst_release(dst); 3225 kfree(tags); 3226 } 3227 } 3228 3229 static int bond_confirm_addr6(struct net_device *dev, 3230 struct netdev_nested_priv *priv) 3231 { 3232 struct in6_addr *addr = (struct in6_addr *)priv->data; 3233 3234 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3235 } 3236 3237 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3238 { 3239 struct netdev_nested_priv priv = { 3240 .data = addr, 3241 }; 3242 int ret = false; 3243 3244 if (bond_confirm_addr6(bond->dev, &priv)) 3245 return true; 3246 3247 rcu_read_lock(); 3248 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3249 ret = true; 3250 rcu_read_unlock(); 3251 3252 return ret; 3253 } 3254 3255 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3256 struct in6_addr *saddr, struct in6_addr *daddr) 3257 { 3258 int i; 3259 3260 /* Ignore NAs that: 3261 * 1. Source address is unspecified address. 3262 * 2. Dest address is neither all-nodes multicast address nor 3263 * exist on bond interface. 3264 */ 3265 if (ipv6_addr_any(saddr) || 3266 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3267 !bond_has_this_ip6(bond, daddr))) { 3268 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3269 __func__, saddr, daddr); 3270 return; 3271 } 3272 3273 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3274 if (i == -1) { 3275 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3276 __func__, saddr); 3277 return; 3278 } 3279 slave->last_rx = jiffies; 3280 slave->target_last_arp_rx[i] = jiffies; 3281 } 3282 3283 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3284 struct slave *slave) 3285 { 3286 struct slave *curr_active_slave, *curr_arp_slave; 3287 struct in6_addr *saddr, *daddr; 3288 struct { 3289 struct ipv6hdr ip6; 3290 struct icmp6hdr icmp6; 3291 } *combined, _combined; 3292 3293 if (skb->pkt_type == PACKET_OTHERHOST || 3294 skb->pkt_type == PACKET_LOOPBACK) 3295 goto out; 3296 3297 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined); 3298 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP || 3299 (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION && 3300 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)) 3301 goto out; 3302 3303 saddr = &combined->ip6.saddr; 3304 daddr = &combined->ip6.daddr; 3305 3306 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3307 __func__, slave->dev->name, bond_slave_state(slave), 3308 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3309 saddr, daddr); 3310 3311 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3312 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3313 3314 /* We 'trust' the received ARP enough to validate it if: 3315 * see bond_arp_rcv(). 3316 */ 3317 if (bond_is_active_slave(slave)) 3318 bond_validate_na(bond, slave, saddr, daddr); 3319 else if (curr_active_slave && 3320 time_after(slave_last_rx(bond, curr_active_slave), 3321 curr_active_slave->last_link_up)) 3322 bond_validate_na(bond, slave, daddr, saddr); 3323 else if (curr_arp_slave && 3324 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3325 bond_validate_na(bond, slave, saddr, daddr); 3326 3327 out: 3328 return RX_HANDLER_ANOTHER; 3329 } 3330 #endif 3331 3332 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3333 struct slave *slave) 3334 { 3335 #if IS_ENABLED(CONFIG_IPV6) 3336 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3337 #endif 3338 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3339 3340 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3341 __func__, skb->dev->name); 3342 3343 /* Use arp validate logic for both ARP and NS */ 3344 if (!slave_do_arp_validate(bond, slave)) { 3345 if ((slave_do_arp_validate_only(bond) && is_arp) || 3346 #if IS_ENABLED(CONFIG_IPV6) 3347 (slave_do_arp_validate_only(bond) && is_ipv6) || 3348 #endif 3349 !slave_do_arp_validate_only(bond)) 3350 slave->last_rx = jiffies; 3351 return RX_HANDLER_ANOTHER; 3352 } else if (is_arp) { 3353 return bond_arp_rcv(skb, bond, slave); 3354 #if IS_ENABLED(CONFIG_IPV6) 3355 } else if (is_ipv6) { 3356 return bond_na_rcv(skb, bond, slave); 3357 #endif 3358 } else { 3359 return RX_HANDLER_ANOTHER; 3360 } 3361 } 3362 3363 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3364 { 3365 bond_arp_send_all(bond, slave); 3366 #if IS_ENABLED(CONFIG_IPV6) 3367 bond_ns_send_all(bond, slave); 3368 #endif 3369 } 3370 3371 /* function to verify if we're in the arp_interval timeslice, returns true if 3372 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3373 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3374 */ 3375 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3376 int mod) 3377 { 3378 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3379 3380 return time_in_range(jiffies, 3381 last_act - delta_in_ticks, 3382 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3383 } 3384 3385 /* This function is called regularly to monitor each slave's link 3386 * ensuring that traffic is being sent and received when arp monitoring 3387 * is used in load-balancing mode. if the adapter has been dormant, then an 3388 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3389 * arp monitoring in active backup mode. 3390 */ 3391 static void bond_loadbalance_arp_mon(struct bonding *bond) 3392 { 3393 struct slave *slave, *oldcurrent; 3394 struct list_head *iter; 3395 int do_failover = 0, slave_state_changed = 0; 3396 3397 if (!bond_has_slaves(bond)) 3398 goto re_arm; 3399 3400 rcu_read_lock(); 3401 3402 oldcurrent = rcu_dereference(bond->curr_active_slave); 3403 /* see if any of the previous devices are up now (i.e. they have 3404 * xmt and rcv traffic). the curr_active_slave does not come into 3405 * the picture unless it is null. also, slave->last_link_up is not 3406 * needed here because we send an arp on each slave and give a slave 3407 * as long as it needs to get the tx/rx within the delta. 3408 * TODO: what about up/down delay in arp mode? it wasn't here before 3409 * so it can wait 3410 */ 3411 bond_for_each_slave_rcu(bond, slave, iter) { 3412 unsigned long last_tx = slave_last_tx(slave); 3413 3414 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3415 3416 if (slave->link != BOND_LINK_UP) { 3417 if (bond_time_in_interval(bond, last_tx, 1) && 3418 bond_time_in_interval(bond, slave->last_rx, 1)) { 3419 3420 bond_propose_link_state(slave, BOND_LINK_UP); 3421 slave_state_changed = 1; 3422 3423 /* primary_slave has no meaning in round-robin 3424 * mode. the window of a slave being up and 3425 * curr_active_slave being null after enslaving 3426 * is closed. 3427 */ 3428 if (!oldcurrent) { 3429 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3430 do_failover = 1; 3431 } else { 3432 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3433 } 3434 } 3435 } else { 3436 /* slave->link == BOND_LINK_UP */ 3437 3438 /* not all switches will respond to an arp request 3439 * when the source ip is 0, so don't take the link down 3440 * if we don't know our ip yet 3441 */ 3442 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3443 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3444 3445 bond_propose_link_state(slave, BOND_LINK_DOWN); 3446 slave_state_changed = 1; 3447 3448 if (slave->link_failure_count < UINT_MAX) 3449 slave->link_failure_count++; 3450 3451 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3452 3453 if (slave == oldcurrent) 3454 do_failover = 1; 3455 } 3456 } 3457 3458 /* note: if switch is in round-robin mode, all links 3459 * must tx arp to ensure all links rx an arp - otherwise 3460 * links may oscillate or not come up at all; if switch is 3461 * in something like xor mode, there is nothing we can 3462 * do - all replies will be rx'ed on same link causing slaves 3463 * to be unstable during low/no traffic periods 3464 */ 3465 if (bond_slave_is_up(slave)) 3466 bond_send_validate(bond, slave); 3467 } 3468 3469 rcu_read_unlock(); 3470 3471 if (do_failover || slave_state_changed) { 3472 if (!rtnl_trylock()) 3473 goto re_arm; 3474 3475 bond_for_each_slave(bond, slave, iter) { 3476 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3477 slave->link = slave->link_new_state; 3478 } 3479 3480 if (slave_state_changed) { 3481 bond_slave_state_change(bond); 3482 if (BOND_MODE(bond) == BOND_MODE_XOR) 3483 bond_update_slave_arr(bond, NULL); 3484 } 3485 if (do_failover) { 3486 block_netpoll_tx(); 3487 bond_select_active_slave(bond); 3488 unblock_netpoll_tx(); 3489 } 3490 rtnl_unlock(); 3491 } 3492 3493 re_arm: 3494 if (bond->params.arp_interval) 3495 queue_delayed_work(bond->wq, &bond->arp_work, 3496 msecs_to_jiffies(bond->params.arp_interval)); 3497 } 3498 3499 /* Called to inspect slaves for active-backup mode ARP monitor link state 3500 * changes. Sets proposed link state in slaves to specify what action 3501 * should take place for the slave. Returns 0 if no changes are found, >0 3502 * if changes to link states must be committed. 3503 * 3504 * Called with rcu_read_lock held. 3505 */ 3506 static int bond_ab_arp_inspect(struct bonding *bond) 3507 { 3508 unsigned long last_tx, last_rx; 3509 struct list_head *iter; 3510 struct slave *slave; 3511 int commit = 0; 3512 3513 bond_for_each_slave_rcu(bond, slave, iter) { 3514 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3515 last_rx = slave_last_rx(bond, slave); 3516 3517 if (slave->link != BOND_LINK_UP) { 3518 if (bond_time_in_interval(bond, last_rx, 1)) { 3519 bond_propose_link_state(slave, BOND_LINK_UP); 3520 commit++; 3521 } else if (slave->link == BOND_LINK_BACK) { 3522 bond_propose_link_state(slave, BOND_LINK_FAIL); 3523 commit++; 3524 } 3525 continue; 3526 } 3527 3528 /* Give slaves 2*delta after being enslaved or made 3529 * active. This avoids bouncing, as the last receive 3530 * times need a full ARP monitor cycle to be updated. 3531 */ 3532 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3533 continue; 3534 3535 /* Backup slave is down if: 3536 * - No current_arp_slave AND 3537 * - more than (missed_max+1)*delta since last receive AND 3538 * - the bond has an IP address 3539 * 3540 * Note: a non-null current_arp_slave indicates 3541 * the curr_active_slave went down and we are 3542 * searching for a new one; under this condition 3543 * we only take the curr_active_slave down - this 3544 * gives each slave a chance to tx/rx traffic 3545 * before being taken out 3546 */ 3547 if (!bond_is_active_slave(slave) && 3548 !rcu_access_pointer(bond->current_arp_slave) && 3549 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3550 bond_propose_link_state(slave, BOND_LINK_DOWN); 3551 commit++; 3552 } 3553 3554 /* Active slave is down if: 3555 * - more than missed_max*delta since transmitting OR 3556 * - (more than missed_max*delta since receive AND 3557 * the bond has an IP address) 3558 */ 3559 last_tx = slave_last_tx(slave); 3560 if (bond_is_active_slave(slave) && 3561 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3562 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3563 bond_propose_link_state(slave, BOND_LINK_DOWN); 3564 commit++; 3565 } 3566 } 3567 3568 return commit; 3569 } 3570 3571 /* Called to commit link state changes noted by inspection step of 3572 * active-backup mode ARP monitor. 3573 * 3574 * Called with RTNL hold. 3575 */ 3576 static void bond_ab_arp_commit(struct bonding *bond) 3577 { 3578 bool do_failover = false; 3579 struct list_head *iter; 3580 unsigned long last_tx; 3581 struct slave *slave; 3582 3583 bond_for_each_slave(bond, slave, iter) { 3584 switch (slave->link_new_state) { 3585 case BOND_LINK_NOCHANGE: 3586 continue; 3587 3588 case BOND_LINK_UP: 3589 last_tx = slave_last_tx(slave); 3590 if (rtnl_dereference(bond->curr_active_slave) != slave || 3591 (!rtnl_dereference(bond->curr_active_slave) && 3592 bond_time_in_interval(bond, last_tx, 1))) { 3593 struct slave *current_arp_slave; 3594 3595 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3596 bond_set_slave_link_state(slave, BOND_LINK_UP, 3597 BOND_SLAVE_NOTIFY_NOW); 3598 if (current_arp_slave) { 3599 bond_set_slave_inactive_flags( 3600 current_arp_slave, 3601 BOND_SLAVE_NOTIFY_NOW); 3602 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3603 } 3604 3605 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3606 3607 if (!rtnl_dereference(bond->curr_active_slave) || 3608 slave == rtnl_dereference(bond->primary_slave) || 3609 slave->prio > rtnl_dereference(bond->curr_active_slave)->prio) 3610 do_failover = true; 3611 3612 } 3613 3614 continue; 3615 3616 case BOND_LINK_DOWN: 3617 if (slave->link_failure_count < UINT_MAX) 3618 slave->link_failure_count++; 3619 3620 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3621 BOND_SLAVE_NOTIFY_NOW); 3622 bond_set_slave_inactive_flags(slave, 3623 BOND_SLAVE_NOTIFY_NOW); 3624 3625 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3626 3627 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3628 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3629 do_failover = true; 3630 } 3631 3632 continue; 3633 3634 case BOND_LINK_FAIL: 3635 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3636 BOND_SLAVE_NOTIFY_NOW); 3637 bond_set_slave_inactive_flags(slave, 3638 BOND_SLAVE_NOTIFY_NOW); 3639 3640 /* A slave has just been enslaved and has become 3641 * the current active slave. 3642 */ 3643 if (rtnl_dereference(bond->curr_active_slave)) 3644 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3645 continue; 3646 3647 default: 3648 slave_err(bond->dev, slave->dev, 3649 "impossible: link_new_state %d on slave\n", 3650 slave->link_new_state); 3651 continue; 3652 } 3653 } 3654 3655 if (do_failover) { 3656 block_netpoll_tx(); 3657 bond_select_active_slave(bond); 3658 unblock_netpoll_tx(); 3659 } 3660 3661 bond_set_carrier(bond); 3662 } 3663 3664 /* Send ARP probes for active-backup mode ARP monitor. 3665 * 3666 * Called with rcu_read_lock held. 3667 */ 3668 static bool bond_ab_arp_probe(struct bonding *bond) 3669 { 3670 struct slave *slave, *before = NULL, *new_slave = NULL, 3671 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3672 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3673 struct list_head *iter; 3674 bool found = false; 3675 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3676 3677 if (curr_arp_slave && curr_active_slave) 3678 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3679 curr_arp_slave->dev->name, 3680 curr_active_slave->dev->name); 3681 3682 if (curr_active_slave) { 3683 bond_send_validate(bond, curr_active_slave); 3684 return should_notify_rtnl; 3685 } 3686 3687 /* if we don't have a curr_active_slave, search for the next available 3688 * backup slave from the current_arp_slave and make it the candidate 3689 * for becoming the curr_active_slave 3690 */ 3691 3692 if (!curr_arp_slave) { 3693 curr_arp_slave = bond_first_slave_rcu(bond); 3694 if (!curr_arp_slave) 3695 return should_notify_rtnl; 3696 } 3697 3698 bond_for_each_slave_rcu(bond, slave, iter) { 3699 if (!found && !before && bond_slave_is_up(slave)) 3700 before = slave; 3701 3702 if (found && !new_slave && bond_slave_is_up(slave)) 3703 new_slave = slave; 3704 /* if the link state is up at this point, we 3705 * mark it down - this can happen if we have 3706 * simultaneous link failures and 3707 * reselect_active_interface doesn't make this 3708 * one the current slave so it is still marked 3709 * up when it is actually down 3710 */ 3711 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3712 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3713 BOND_SLAVE_NOTIFY_LATER); 3714 if (slave->link_failure_count < UINT_MAX) 3715 slave->link_failure_count++; 3716 3717 bond_set_slave_inactive_flags(slave, 3718 BOND_SLAVE_NOTIFY_LATER); 3719 3720 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3721 } 3722 if (slave == curr_arp_slave) 3723 found = true; 3724 } 3725 3726 if (!new_slave && before) 3727 new_slave = before; 3728 3729 if (!new_slave) 3730 goto check_state; 3731 3732 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3733 BOND_SLAVE_NOTIFY_LATER); 3734 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3735 bond_send_validate(bond, new_slave); 3736 new_slave->last_link_up = jiffies; 3737 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3738 3739 check_state: 3740 bond_for_each_slave_rcu(bond, slave, iter) { 3741 if (slave->should_notify || slave->should_notify_link) { 3742 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3743 break; 3744 } 3745 } 3746 return should_notify_rtnl; 3747 } 3748 3749 static void bond_activebackup_arp_mon(struct bonding *bond) 3750 { 3751 bool should_notify_peers = false; 3752 bool should_notify_rtnl = false; 3753 int delta_in_ticks; 3754 3755 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3756 3757 if (!bond_has_slaves(bond)) 3758 goto re_arm; 3759 3760 rcu_read_lock(); 3761 3762 should_notify_peers = bond_should_notify_peers(bond); 3763 3764 if (bond_ab_arp_inspect(bond)) { 3765 rcu_read_unlock(); 3766 3767 /* Race avoidance with bond_close flush of workqueue */ 3768 if (!rtnl_trylock()) { 3769 delta_in_ticks = 1; 3770 should_notify_peers = false; 3771 goto re_arm; 3772 } 3773 3774 bond_ab_arp_commit(bond); 3775 3776 rtnl_unlock(); 3777 rcu_read_lock(); 3778 } 3779 3780 should_notify_rtnl = bond_ab_arp_probe(bond); 3781 rcu_read_unlock(); 3782 3783 re_arm: 3784 if (bond->params.arp_interval) 3785 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3786 3787 if (should_notify_peers || should_notify_rtnl) { 3788 if (!rtnl_trylock()) 3789 return; 3790 3791 if (should_notify_peers) { 3792 bond->send_peer_notif--; 3793 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3794 bond->dev); 3795 } 3796 if (should_notify_rtnl) { 3797 bond_slave_state_notify(bond); 3798 bond_slave_link_notify(bond); 3799 } 3800 3801 rtnl_unlock(); 3802 } 3803 } 3804 3805 static void bond_arp_monitor(struct work_struct *work) 3806 { 3807 struct bonding *bond = container_of(work, struct bonding, 3808 arp_work.work); 3809 3810 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3811 bond_activebackup_arp_mon(bond); 3812 else 3813 bond_loadbalance_arp_mon(bond); 3814 } 3815 3816 /*-------------------------- netdev event handling --------------------------*/ 3817 3818 /* Change device name */ 3819 static int bond_event_changename(struct bonding *bond) 3820 { 3821 bond_remove_proc_entry(bond); 3822 bond_create_proc_entry(bond); 3823 3824 bond_debug_reregister(bond); 3825 3826 return NOTIFY_DONE; 3827 } 3828 3829 static int bond_master_netdev_event(unsigned long event, 3830 struct net_device *bond_dev) 3831 { 3832 struct bonding *event_bond = netdev_priv(bond_dev); 3833 3834 netdev_dbg(bond_dev, "%s called\n", __func__); 3835 3836 switch (event) { 3837 case NETDEV_CHANGENAME: 3838 return bond_event_changename(event_bond); 3839 case NETDEV_UNREGISTER: 3840 bond_remove_proc_entry(event_bond); 3841 #ifdef CONFIG_XFRM_OFFLOAD 3842 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3843 #endif /* CONFIG_XFRM_OFFLOAD */ 3844 break; 3845 case NETDEV_REGISTER: 3846 bond_create_proc_entry(event_bond); 3847 break; 3848 default: 3849 break; 3850 } 3851 3852 return NOTIFY_DONE; 3853 } 3854 3855 static int bond_slave_netdev_event(unsigned long event, 3856 struct net_device *slave_dev) 3857 { 3858 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3859 struct bonding *bond; 3860 struct net_device *bond_dev; 3861 3862 /* A netdev event can be generated while enslaving a device 3863 * before netdev_rx_handler_register is called in which case 3864 * slave will be NULL 3865 */ 3866 if (!slave) { 3867 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3868 return NOTIFY_DONE; 3869 } 3870 3871 bond_dev = slave->bond->dev; 3872 bond = slave->bond; 3873 primary = rtnl_dereference(bond->primary_slave); 3874 3875 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3876 3877 switch (event) { 3878 case NETDEV_UNREGISTER: 3879 if (bond_dev->type != ARPHRD_ETHER) 3880 bond_release_and_destroy(bond_dev, slave_dev); 3881 else 3882 __bond_release_one(bond_dev, slave_dev, false, true); 3883 break; 3884 case NETDEV_UP: 3885 case NETDEV_CHANGE: 3886 /* For 802.3ad mode only: 3887 * Getting invalid Speed/Duplex values here will put slave 3888 * in weird state. Mark it as link-fail if the link was 3889 * previously up or link-down if it hasn't yet come up, and 3890 * let link-monitoring (miimon) set it right when correct 3891 * speeds/duplex are available. 3892 */ 3893 if (bond_update_speed_duplex(slave) && 3894 BOND_MODE(bond) == BOND_MODE_8023AD) { 3895 if (slave->last_link_up) 3896 slave->link = BOND_LINK_FAIL; 3897 else 3898 slave->link = BOND_LINK_DOWN; 3899 } 3900 3901 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3902 bond_3ad_adapter_speed_duplex_changed(slave); 3903 fallthrough; 3904 case NETDEV_DOWN: 3905 /* Refresh slave-array if applicable! 3906 * If the setup does not use miimon or arpmon (mode-specific!), 3907 * then these events will not cause the slave-array to be 3908 * refreshed. This will cause xmit to use a slave that is not 3909 * usable. Avoid such situation by refeshing the array at these 3910 * events. If these (miimon/arpmon) parameters are configured 3911 * then array gets refreshed twice and that should be fine! 3912 */ 3913 if (bond_mode_can_use_xmit_hash(bond)) 3914 bond_update_slave_arr(bond, NULL); 3915 break; 3916 case NETDEV_CHANGEMTU: 3917 /* TODO: Should slaves be allowed to 3918 * independently alter their MTU? For 3919 * an active-backup bond, slaves need 3920 * not be the same type of device, so 3921 * MTUs may vary. For other modes, 3922 * slaves arguably should have the 3923 * same MTUs. To do this, we'd need to 3924 * take over the slave's change_mtu 3925 * function for the duration of their 3926 * servitude. 3927 */ 3928 break; 3929 case NETDEV_CHANGENAME: 3930 /* we don't care if we don't have primary set */ 3931 if (!bond_uses_primary(bond) || 3932 !bond->params.primary[0]) 3933 break; 3934 3935 if (slave == primary) { 3936 /* slave's name changed - he's no longer primary */ 3937 RCU_INIT_POINTER(bond->primary_slave, NULL); 3938 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3939 /* we have a new primary slave */ 3940 rcu_assign_pointer(bond->primary_slave, slave); 3941 } else { /* we didn't change primary - exit */ 3942 break; 3943 } 3944 3945 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 3946 primary ? slave_dev->name : "none"); 3947 3948 block_netpoll_tx(); 3949 bond_select_active_slave(bond); 3950 unblock_netpoll_tx(); 3951 break; 3952 case NETDEV_FEAT_CHANGE: 3953 if (!bond->notifier_ctx) { 3954 bond->notifier_ctx = true; 3955 bond_compute_features(bond); 3956 bond->notifier_ctx = false; 3957 } 3958 break; 3959 case NETDEV_RESEND_IGMP: 3960 /* Propagate to master device */ 3961 call_netdevice_notifiers(event, slave->bond->dev); 3962 break; 3963 case NETDEV_XDP_FEAT_CHANGE: 3964 bond_xdp_set_features(bond_dev); 3965 break; 3966 default: 3967 break; 3968 } 3969 3970 return NOTIFY_DONE; 3971 } 3972 3973 /* bond_netdev_event: handle netdev notifier chain events. 3974 * 3975 * This function receives events for the netdev chain. The caller (an 3976 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 3977 * locks for us to safely manipulate the slave devices (RTNL lock, 3978 * dev_probe_lock). 3979 */ 3980 static int bond_netdev_event(struct notifier_block *this, 3981 unsigned long event, void *ptr) 3982 { 3983 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 3984 3985 netdev_dbg(event_dev, "%s received %s\n", 3986 __func__, netdev_cmd_to_name(event)); 3987 3988 if (!(event_dev->priv_flags & IFF_BONDING)) 3989 return NOTIFY_DONE; 3990 3991 if (event_dev->flags & IFF_MASTER) { 3992 int ret; 3993 3994 ret = bond_master_netdev_event(event, event_dev); 3995 if (ret != NOTIFY_DONE) 3996 return ret; 3997 } 3998 3999 if (event_dev->flags & IFF_SLAVE) 4000 return bond_slave_netdev_event(event, event_dev); 4001 4002 return NOTIFY_DONE; 4003 } 4004 4005 static struct notifier_block bond_netdev_notifier = { 4006 .notifier_call = bond_netdev_event, 4007 }; 4008 4009 /*---------------------------- Hashing Policies -----------------------------*/ 4010 4011 /* Helper to access data in a packet, with or without a backing skb. 4012 * If skb is given the data is linearized if necessary via pskb_may_pull. 4013 */ 4014 static inline const void *bond_pull_data(struct sk_buff *skb, 4015 const void *data, int hlen, int n) 4016 { 4017 if (likely(n <= hlen)) 4018 return data; 4019 else if (skb && likely(pskb_may_pull(skb, n))) 4020 return skb->head; 4021 4022 return NULL; 4023 } 4024 4025 /* L2 hash helper */ 4026 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4027 { 4028 struct ethhdr *ep; 4029 4030 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4031 if (!data) 4032 return 0; 4033 4034 ep = (struct ethhdr *)(data + mhoff); 4035 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 4036 } 4037 4038 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 4039 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 4040 { 4041 const struct ipv6hdr *iph6; 4042 const struct iphdr *iph; 4043 4044 if (l2_proto == htons(ETH_P_IP)) { 4045 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 4046 if (!data) 4047 return false; 4048 4049 iph = (const struct iphdr *)(data + *nhoff); 4050 iph_to_flow_copy_v4addrs(fk, iph); 4051 *nhoff += iph->ihl << 2; 4052 if (!ip_is_fragment(iph)) 4053 *ip_proto = iph->protocol; 4054 } else if (l2_proto == htons(ETH_P_IPV6)) { 4055 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 4056 if (!data) 4057 return false; 4058 4059 iph6 = (const struct ipv6hdr *)(data + *nhoff); 4060 iph_to_flow_copy_v6addrs(fk, iph6); 4061 *nhoff += sizeof(*iph6); 4062 *ip_proto = iph6->nexthdr; 4063 } else { 4064 return false; 4065 } 4066 4067 if (l34 && *ip_proto >= 0) 4068 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 4069 4070 return true; 4071 } 4072 4073 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4074 { 4075 u32 srcmac_vendor = 0, srcmac_dev = 0; 4076 struct ethhdr *mac_hdr; 4077 u16 vlan = 0; 4078 int i; 4079 4080 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4081 if (!data) 4082 return 0; 4083 mac_hdr = (struct ethhdr *)(data + mhoff); 4084 4085 for (i = 0; i < 3; i++) 4086 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4087 4088 for (i = 3; i < ETH_ALEN; i++) 4089 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4090 4091 if (skb && skb_vlan_tag_present(skb)) 4092 vlan = skb_vlan_tag_get(skb); 4093 4094 return vlan ^ srcmac_vendor ^ srcmac_dev; 4095 } 4096 4097 /* Extract the appropriate headers based on bond's xmit policy */ 4098 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4099 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4100 { 4101 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4102 int ip_proto = -1; 4103 4104 switch (bond->params.xmit_policy) { 4105 case BOND_XMIT_POLICY_ENCAP23: 4106 case BOND_XMIT_POLICY_ENCAP34: 4107 memset(fk, 0, sizeof(*fk)); 4108 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4109 fk, data, l2_proto, nhoff, hlen, 0); 4110 default: 4111 break; 4112 } 4113 4114 fk->ports.ports = 0; 4115 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4116 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4117 return false; 4118 4119 /* ICMP error packets contains at least 8 bytes of the header 4120 * of the packet which generated the error. Use this information 4121 * to correlate ICMP error packets within the same flow which 4122 * generated the error. 4123 */ 4124 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4125 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4126 if (ip_proto == IPPROTO_ICMP) { 4127 if (!icmp_is_err(fk->icmp.type)) 4128 return true; 4129 4130 nhoff += sizeof(struct icmphdr); 4131 } else if (ip_proto == IPPROTO_ICMPV6) { 4132 if (!icmpv6_is_err(fk->icmp.type)) 4133 return true; 4134 4135 nhoff += sizeof(struct icmp6hdr); 4136 } 4137 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4138 } 4139 4140 return true; 4141 } 4142 4143 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4144 { 4145 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4146 (__force u32)flow_get_u32_src(flow); 4147 hash ^= (hash >> 16); 4148 hash ^= (hash >> 8); 4149 4150 /* discard lowest hash bit to deal with the common even ports pattern */ 4151 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4152 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4153 return hash >> 1; 4154 4155 return hash; 4156 } 4157 4158 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4159 * the data as required, but this function can be used without it if the data is 4160 * known to be linear (e.g. with xdp_buff). 4161 */ 4162 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4163 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4164 { 4165 struct flow_keys flow; 4166 u32 hash; 4167 4168 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4169 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4170 4171 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4172 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4173 return bond_eth_hash(skb, data, mhoff, hlen); 4174 4175 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4176 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4177 hash = bond_eth_hash(skb, data, mhoff, hlen); 4178 } else { 4179 if (flow.icmp.id) 4180 memcpy(&hash, &flow.icmp, sizeof(hash)); 4181 else 4182 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4183 } 4184 4185 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4186 } 4187 4188 /** 4189 * bond_xmit_hash - generate a hash value based on the xmit policy 4190 * @bond: bonding device 4191 * @skb: buffer to use for headers 4192 * 4193 * This function will extract the necessary headers from the skb buffer and use 4194 * them to generate a hash based on the xmit_policy set in the bonding device 4195 */ 4196 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4197 { 4198 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4199 skb->l4_hash) 4200 return skb->hash; 4201 4202 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4203 skb_mac_offset(skb), skb_network_offset(skb), 4204 skb_headlen(skb)); 4205 } 4206 4207 /** 4208 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4209 * @bond: bonding device 4210 * @xdp: buffer to use for headers 4211 * 4212 * The XDP variant of bond_xmit_hash. 4213 */ 4214 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4215 { 4216 struct ethhdr *eth; 4217 4218 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4219 return 0; 4220 4221 eth = (struct ethhdr *)xdp->data; 4222 4223 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4224 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4225 } 4226 4227 /*-------------------------- Device entry points ----------------------------*/ 4228 4229 void bond_work_init_all(struct bonding *bond) 4230 { 4231 INIT_DELAYED_WORK(&bond->mcast_work, 4232 bond_resend_igmp_join_requests_delayed); 4233 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4234 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4235 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4236 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4237 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4238 } 4239 4240 static void bond_work_cancel_all(struct bonding *bond) 4241 { 4242 cancel_delayed_work_sync(&bond->mii_work); 4243 cancel_delayed_work_sync(&bond->arp_work); 4244 cancel_delayed_work_sync(&bond->alb_work); 4245 cancel_delayed_work_sync(&bond->ad_work); 4246 cancel_delayed_work_sync(&bond->mcast_work); 4247 cancel_delayed_work_sync(&bond->slave_arr_work); 4248 } 4249 4250 static int bond_open(struct net_device *bond_dev) 4251 { 4252 struct bonding *bond = netdev_priv(bond_dev); 4253 struct list_head *iter; 4254 struct slave *slave; 4255 4256 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { 4257 bond->rr_tx_counter = alloc_percpu(u32); 4258 if (!bond->rr_tx_counter) 4259 return -ENOMEM; 4260 } 4261 4262 /* reset slave->backup and slave->inactive */ 4263 if (bond_has_slaves(bond)) { 4264 bond_for_each_slave(bond, slave, iter) { 4265 if (bond_uses_primary(bond) && 4266 slave != rcu_access_pointer(bond->curr_active_slave)) { 4267 bond_set_slave_inactive_flags(slave, 4268 BOND_SLAVE_NOTIFY_NOW); 4269 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4270 bond_set_slave_active_flags(slave, 4271 BOND_SLAVE_NOTIFY_NOW); 4272 } 4273 } 4274 } 4275 4276 if (bond_is_lb(bond)) { 4277 /* bond_alb_initialize must be called before the timer 4278 * is started. 4279 */ 4280 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4281 return -ENOMEM; 4282 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4283 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4284 } 4285 4286 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4287 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4288 4289 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4290 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4291 bond->recv_probe = bond_rcv_validate; 4292 } 4293 4294 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4295 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4296 /* register to receive LACPDUs */ 4297 bond->recv_probe = bond_3ad_lacpdu_recv; 4298 bond_3ad_initiate_agg_selection(bond, 1); 4299 4300 bond_for_each_slave(bond, slave, iter) 4301 dev_mc_add(slave->dev, lacpdu_mcast_addr); 4302 } 4303 4304 if (bond_mode_can_use_xmit_hash(bond)) 4305 bond_update_slave_arr(bond, NULL); 4306 4307 return 0; 4308 } 4309 4310 static int bond_close(struct net_device *bond_dev) 4311 { 4312 struct bonding *bond = netdev_priv(bond_dev); 4313 struct slave *slave; 4314 4315 bond_work_cancel_all(bond); 4316 bond->send_peer_notif = 0; 4317 if (bond_is_lb(bond)) 4318 bond_alb_deinitialize(bond); 4319 bond->recv_probe = NULL; 4320 4321 if (bond_uses_primary(bond)) { 4322 rcu_read_lock(); 4323 slave = rcu_dereference(bond->curr_active_slave); 4324 if (slave) 4325 bond_hw_addr_flush(bond_dev, slave->dev); 4326 rcu_read_unlock(); 4327 } else { 4328 struct list_head *iter; 4329 4330 bond_for_each_slave(bond, slave, iter) 4331 bond_hw_addr_flush(bond_dev, slave->dev); 4332 } 4333 4334 return 0; 4335 } 4336 4337 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4338 * that some drivers can provide 32bit values only. 4339 */ 4340 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4341 const struct rtnl_link_stats64 *_new, 4342 const struct rtnl_link_stats64 *_old) 4343 { 4344 const u64 *new = (const u64 *)_new; 4345 const u64 *old = (const u64 *)_old; 4346 u64 *res = (u64 *)_res; 4347 int i; 4348 4349 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4350 u64 nv = new[i]; 4351 u64 ov = old[i]; 4352 s64 delta = nv - ov; 4353 4354 /* detects if this particular field is 32bit only */ 4355 if (((nv | ov) >> 32) == 0) 4356 delta = (s64)(s32)((u32)nv - (u32)ov); 4357 4358 /* filter anomalies, some drivers reset their stats 4359 * at down/up events. 4360 */ 4361 if (delta > 0) 4362 res[i] += delta; 4363 } 4364 } 4365 4366 #ifdef CONFIG_LOCKDEP 4367 static int bond_get_lowest_level_rcu(struct net_device *dev) 4368 { 4369 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4370 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4371 int cur = 0, max = 0; 4372 4373 now = dev; 4374 iter = &dev->adj_list.lower; 4375 4376 while (1) { 4377 next = NULL; 4378 while (1) { 4379 ldev = netdev_next_lower_dev_rcu(now, &iter); 4380 if (!ldev) 4381 break; 4382 4383 next = ldev; 4384 niter = &ldev->adj_list.lower; 4385 dev_stack[cur] = now; 4386 iter_stack[cur++] = iter; 4387 if (max <= cur) 4388 max = cur; 4389 break; 4390 } 4391 4392 if (!next) { 4393 if (!cur) 4394 return max; 4395 next = dev_stack[--cur]; 4396 niter = iter_stack[cur]; 4397 } 4398 4399 now = next; 4400 iter = niter; 4401 } 4402 4403 return max; 4404 } 4405 #endif 4406 4407 static void bond_get_stats(struct net_device *bond_dev, 4408 struct rtnl_link_stats64 *stats) 4409 { 4410 struct bonding *bond = netdev_priv(bond_dev); 4411 struct rtnl_link_stats64 temp; 4412 struct list_head *iter; 4413 struct slave *slave; 4414 int nest_level = 0; 4415 4416 4417 rcu_read_lock(); 4418 #ifdef CONFIG_LOCKDEP 4419 nest_level = bond_get_lowest_level_rcu(bond_dev); 4420 #endif 4421 4422 spin_lock_nested(&bond->stats_lock, nest_level); 4423 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4424 4425 bond_for_each_slave_rcu(bond, slave, iter) { 4426 const struct rtnl_link_stats64 *new = 4427 dev_get_stats(slave->dev, &temp); 4428 4429 bond_fold_stats(stats, new, &slave->slave_stats); 4430 4431 /* save off the slave stats for the next run */ 4432 memcpy(&slave->slave_stats, new, sizeof(*new)); 4433 } 4434 4435 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4436 spin_unlock(&bond->stats_lock); 4437 rcu_read_unlock(); 4438 } 4439 4440 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4441 { 4442 struct bonding *bond = netdev_priv(bond_dev); 4443 struct mii_ioctl_data *mii = NULL; 4444 const struct net_device_ops *ops; 4445 struct net_device *real_dev; 4446 struct hwtstamp_config cfg; 4447 struct ifreq ifrr; 4448 int res = 0; 4449 4450 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4451 4452 switch (cmd) { 4453 case SIOCGMIIPHY: 4454 mii = if_mii(ifr); 4455 if (!mii) 4456 return -EINVAL; 4457 4458 mii->phy_id = 0; 4459 fallthrough; 4460 case SIOCGMIIREG: 4461 /* We do this again just in case we were called by SIOCGMIIREG 4462 * instead of SIOCGMIIPHY. 4463 */ 4464 mii = if_mii(ifr); 4465 if (!mii) 4466 return -EINVAL; 4467 4468 if (mii->reg_num == 1) { 4469 mii->val_out = 0; 4470 if (netif_carrier_ok(bond->dev)) 4471 mii->val_out = BMSR_LSTATUS; 4472 } 4473 4474 break; 4475 case SIOCSHWTSTAMP: 4476 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4477 return -EFAULT; 4478 4479 if (!(cfg.flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 4480 return -EOPNOTSUPP; 4481 4482 fallthrough; 4483 case SIOCGHWTSTAMP: 4484 real_dev = bond_option_active_slave_get_rcu(bond); 4485 if (!real_dev) 4486 return -EOPNOTSUPP; 4487 4488 strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); 4489 ifrr.ifr_ifru = ifr->ifr_ifru; 4490 4491 ops = real_dev->netdev_ops; 4492 if (netif_device_present(real_dev) && ops->ndo_eth_ioctl) { 4493 res = ops->ndo_eth_ioctl(real_dev, &ifrr, cmd); 4494 if (res) 4495 return res; 4496 4497 ifr->ifr_ifru = ifrr.ifr_ifru; 4498 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 4499 return -EFAULT; 4500 4501 /* Set the BOND_PHC_INDEX flag to notify user space */ 4502 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 4503 4504 return copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)) ? 4505 -EFAULT : 0; 4506 } 4507 fallthrough; 4508 default: 4509 res = -EOPNOTSUPP; 4510 } 4511 4512 return res; 4513 } 4514 4515 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4516 { 4517 struct bonding *bond = netdev_priv(bond_dev); 4518 struct net_device *slave_dev = NULL; 4519 struct ifbond k_binfo; 4520 struct ifbond __user *u_binfo = NULL; 4521 struct ifslave k_sinfo; 4522 struct ifslave __user *u_sinfo = NULL; 4523 struct bond_opt_value newval; 4524 struct net *net; 4525 int res = 0; 4526 4527 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4528 4529 switch (cmd) { 4530 case SIOCBONDINFOQUERY: 4531 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4532 4533 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4534 return -EFAULT; 4535 4536 bond_info_query(bond_dev, &k_binfo); 4537 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4538 return -EFAULT; 4539 4540 return 0; 4541 case SIOCBONDSLAVEINFOQUERY: 4542 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4543 4544 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4545 return -EFAULT; 4546 4547 res = bond_slave_info_query(bond_dev, &k_sinfo); 4548 if (res == 0 && 4549 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4550 return -EFAULT; 4551 4552 return res; 4553 default: 4554 break; 4555 } 4556 4557 net = dev_net(bond_dev); 4558 4559 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4560 return -EPERM; 4561 4562 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4563 4564 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4565 4566 if (!slave_dev) 4567 return -ENODEV; 4568 4569 switch (cmd) { 4570 case SIOCBONDENSLAVE: 4571 res = bond_enslave(bond_dev, slave_dev, NULL); 4572 break; 4573 case SIOCBONDRELEASE: 4574 res = bond_release(bond_dev, slave_dev); 4575 break; 4576 case SIOCBONDSETHWADDR: 4577 res = bond_set_dev_addr(bond_dev, slave_dev); 4578 break; 4579 case SIOCBONDCHANGEACTIVE: 4580 bond_opt_initstr(&newval, slave_dev->name); 4581 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4582 &newval); 4583 break; 4584 default: 4585 res = -EOPNOTSUPP; 4586 } 4587 4588 return res; 4589 } 4590 4591 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4592 void __user *data, int cmd) 4593 { 4594 struct ifreq ifrdata = { .ifr_data = data }; 4595 4596 switch (cmd) { 4597 case BOND_INFO_QUERY_OLD: 4598 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4599 case BOND_SLAVE_INFO_QUERY_OLD: 4600 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4601 case BOND_ENSLAVE_OLD: 4602 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4603 case BOND_RELEASE_OLD: 4604 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4605 case BOND_SETHWADDR_OLD: 4606 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4607 case BOND_CHANGE_ACTIVE_OLD: 4608 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4609 } 4610 4611 return -EOPNOTSUPP; 4612 } 4613 4614 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4615 { 4616 struct bonding *bond = netdev_priv(bond_dev); 4617 4618 if (change & IFF_PROMISC) 4619 bond_set_promiscuity(bond, 4620 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4621 4622 if (change & IFF_ALLMULTI) 4623 bond_set_allmulti(bond, 4624 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4625 } 4626 4627 static void bond_set_rx_mode(struct net_device *bond_dev) 4628 { 4629 struct bonding *bond = netdev_priv(bond_dev); 4630 struct list_head *iter; 4631 struct slave *slave; 4632 4633 rcu_read_lock(); 4634 if (bond_uses_primary(bond)) { 4635 slave = rcu_dereference(bond->curr_active_slave); 4636 if (slave) { 4637 dev_uc_sync(slave->dev, bond_dev); 4638 dev_mc_sync(slave->dev, bond_dev); 4639 } 4640 } else { 4641 bond_for_each_slave_rcu(bond, slave, iter) { 4642 dev_uc_sync_multiple(slave->dev, bond_dev); 4643 dev_mc_sync_multiple(slave->dev, bond_dev); 4644 } 4645 } 4646 rcu_read_unlock(); 4647 } 4648 4649 static int bond_neigh_init(struct neighbour *n) 4650 { 4651 struct bonding *bond = netdev_priv(n->dev); 4652 const struct net_device_ops *slave_ops; 4653 struct neigh_parms parms; 4654 struct slave *slave; 4655 int ret = 0; 4656 4657 rcu_read_lock(); 4658 slave = bond_first_slave_rcu(bond); 4659 if (!slave) 4660 goto out; 4661 slave_ops = slave->dev->netdev_ops; 4662 if (!slave_ops->ndo_neigh_setup) 4663 goto out; 4664 4665 /* TODO: find another way [1] to implement this. 4666 * Passing a zeroed structure is fragile, 4667 * but at least we do not pass garbage. 4668 * 4669 * [1] One way would be that ndo_neigh_setup() never touch 4670 * struct neigh_parms, but propagate the new neigh_setup() 4671 * back to ___neigh_create() / neigh_parms_alloc() 4672 */ 4673 memset(&parms, 0, sizeof(parms)); 4674 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4675 4676 if (ret) 4677 goto out; 4678 4679 if (parms.neigh_setup) 4680 ret = parms.neigh_setup(n); 4681 out: 4682 rcu_read_unlock(); 4683 return ret; 4684 } 4685 4686 /* The bonding ndo_neigh_setup is called at init time beofre any 4687 * slave exists. So we must declare proxy setup function which will 4688 * be used at run time to resolve the actual slave neigh param setup. 4689 * 4690 * It's also called by master devices (such as vlans) to setup their 4691 * underlying devices. In that case - do nothing, we're already set up from 4692 * our init. 4693 */ 4694 static int bond_neigh_setup(struct net_device *dev, 4695 struct neigh_parms *parms) 4696 { 4697 /* modify only our neigh_parms */ 4698 if (parms->dev == dev) 4699 parms->neigh_setup = bond_neigh_init; 4700 4701 return 0; 4702 } 4703 4704 /* Change the MTU of all of a master's slaves to match the master */ 4705 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4706 { 4707 struct bonding *bond = netdev_priv(bond_dev); 4708 struct slave *slave, *rollback_slave; 4709 struct list_head *iter; 4710 int res = 0; 4711 4712 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4713 4714 bond_for_each_slave(bond, slave, iter) { 4715 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4716 slave, slave->dev->netdev_ops->ndo_change_mtu); 4717 4718 res = dev_set_mtu(slave->dev, new_mtu); 4719 4720 if (res) { 4721 /* If we failed to set the slave's mtu to the new value 4722 * we must abort the operation even in ACTIVE_BACKUP 4723 * mode, because if we allow the backup slaves to have 4724 * different mtu values than the active slave we'll 4725 * need to change their mtu when doing a failover. That 4726 * means changing their mtu from timer context, which 4727 * is probably not a good idea. 4728 */ 4729 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4730 res, new_mtu); 4731 goto unwind; 4732 } 4733 } 4734 4735 bond_dev->mtu = new_mtu; 4736 4737 return 0; 4738 4739 unwind: 4740 /* unwind from head to the slave that failed */ 4741 bond_for_each_slave(bond, rollback_slave, iter) { 4742 int tmp_res; 4743 4744 if (rollback_slave == slave) 4745 break; 4746 4747 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4748 if (tmp_res) 4749 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4750 tmp_res); 4751 } 4752 4753 return res; 4754 } 4755 4756 /* Change HW address 4757 * 4758 * Note that many devices must be down to change the HW address, and 4759 * downing the master releases all slaves. We can make bonds full of 4760 * bonding devices to test this, however. 4761 */ 4762 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4763 { 4764 struct bonding *bond = netdev_priv(bond_dev); 4765 struct slave *slave, *rollback_slave; 4766 struct sockaddr_storage *ss = addr, tmp_ss; 4767 struct list_head *iter; 4768 int res = 0; 4769 4770 if (BOND_MODE(bond) == BOND_MODE_ALB) 4771 return bond_alb_set_mac_address(bond_dev, addr); 4772 4773 4774 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4775 4776 /* If fail_over_mac is enabled, do nothing and return success. 4777 * Returning an error causes ifenslave to fail. 4778 */ 4779 if (bond->params.fail_over_mac && 4780 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4781 return 0; 4782 4783 if (!is_valid_ether_addr(ss->__data)) 4784 return -EADDRNOTAVAIL; 4785 4786 bond_for_each_slave(bond, slave, iter) { 4787 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4788 __func__, slave); 4789 res = dev_set_mac_address(slave->dev, addr, NULL); 4790 if (res) { 4791 /* TODO: consider downing the slave 4792 * and retry ? 4793 * User should expect communications 4794 * breakage anyway until ARP finish 4795 * updating, so... 4796 */ 4797 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4798 __func__, res); 4799 goto unwind; 4800 } 4801 } 4802 4803 /* success */ 4804 dev_addr_set(bond_dev, ss->__data); 4805 return 0; 4806 4807 unwind: 4808 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4809 tmp_ss.ss_family = bond_dev->type; 4810 4811 /* unwind from head to the slave that failed */ 4812 bond_for_each_slave(bond, rollback_slave, iter) { 4813 int tmp_res; 4814 4815 if (rollback_slave == slave) 4816 break; 4817 4818 tmp_res = dev_set_mac_address(rollback_slave->dev, 4819 (struct sockaddr *)&tmp_ss, NULL); 4820 if (tmp_res) { 4821 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4822 __func__, tmp_res); 4823 } 4824 } 4825 4826 return res; 4827 } 4828 4829 /** 4830 * bond_get_slave_by_id - get xmit slave with slave_id 4831 * @bond: bonding device that is transmitting 4832 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4833 * 4834 * This function tries to get slave with slave_id but in case 4835 * it fails, it tries to find the first available slave for transmission. 4836 */ 4837 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4838 int slave_id) 4839 { 4840 struct list_head *iter; 4841 struct slave *slave; 4842 int i = slave_id; 4843 4844 /* Here we start from the slave with slave_id */ 4845 bond_for_each_slave_rcu(bond, slave, iter) { 4846 if (--i < 0) { 4847 if (bond_slave_can_tx(slave)) 4848 return slave; 4849 } 4850 } 4851 4852 /* Here we start from the first slave up to slave_id */ 4853 i = slave_id; 4854 bond_for_each_slave_rcu(bond, slave, iter) { 4855 if (--i < 0) 4856 break; 4857 if (bond_slave_can_tx(slave)) 4858 return slave; 4859 } 4860 /* no slave that can tx has been found */ 4861 return NULL; 4862 } 4863 4864 /** 4865 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4866 * @bond: bonding device to use 4867 * 4868 * Based on the value of the bonding device's packets_per_slave parameter 4869 * this function generates a slave id, which is usually used as the next 4870 * slave to transmit through. 4871 */ 4872 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4873 { 4874 u32 slave_id; 4875 struct reciprocal_value reciprocal_packets_per_slave; 4876 int packets_per_slave = bond->params.packets_per_slave; 4877 4878 switch (packets_per_slave) { 4879 case 0: 4880 slave_id = get_random_u32(); 4881 break; 4882 case 1: 4883 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4884 break; 4885 default: 4886 reciprocal_packets_per_slave = 4887 bond->params.reciprocal_packets_per_slave; 4888 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4889 slave_id = reciprocal_divide(slave_id, 4890 reciprocal_packets_per_slave); 4891 break; 4892 } 4893 4894 return slave_id; 4895 } 4896 4897 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4898 struct sk_buff *skb) 4899 { 4900 struct slave *slave; 4901 int slave_cnt; 4902 u32 slave_id; 4903 4904 /* Start with the curr_active_slave that joined the bond as the 4905 * default for sending IGMP traffic. For failover purposes one 4906 * needs to maintain some consistency for the interface that will 4907 * send the join/membership reports. The curr_active_slave found 4908 * will send all of this type of traffic. 4909 */ 4910 if (skb->protocol == htons(ETH_P_IP)) { 4911 int noff = skb_network_offset(skb); 4912 struct iphdr *iph; 4913 4914 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4915 goto non_igmp; 4916 4917 iph = ip_hdr(skb); 4918 if (iph->protocol == IPPROTO_IGMP) { 4919 slave = rcu_dereference(bond->curr_active_slave); 4920 if (slave) 4921 return slave; 4922 return bond_get_slave_by_id(bond, 0); 4923 } 4924 } 4925 4926 non_igmp: 4927 slave_cnt = READ_ONCE(bond->slave_cnt); 4928 if (likely(slave_cnt)) { 4929 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4930 return bond_get_slave_by_id(bond, slave_id); 4931 } 4932 return NULL; 4933 } 4934 4935 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4936 struct xdp_buff *xdp) 4937 { 4938 struct slave *slave; 4939 int slave_cnt; 4940 u32 slave_id; 4941 const struct ethhdr *eth; 4942 void *data = xdp->data; 4943 4944 if (data + sizeof(struct ethhdr) > xdp->data_end) 4945 goto non_igmp; 4946 4947 eth = (struct ethhdr *)data; 4948 data += sizeof(struct ethhdr); 4949 4950 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4951 if (eth->h_proto == htons(ETH_P_IP)) { 4952 const struct iphdr *iph; 4953 4954 if (data + sizeof(struct iphdr) > xdp->data_end) 4955 goto non_igmp; 4956 4957 iph = (struct iphdr *)data; 4958 4959 if (iph->protocol == IPPROTO_IGMP) { 4960 slave = rcu_dereference(bond->curr_active_slave); 4961 if (slave) 4962 return slave; 4963 return bond_get_slave_by_id(bond, 0); 4964 } 4965 } 4966 4967 non_igmp: 4968 slave_cnt = READ_ONCE(bond->slave_cnt); 4969 if (likely(slave_cnt)) { 4970 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4971 return bond_get_slave_by_id(bond, slave_id); 4972 } 4973 return NULL; 4974 } 4975 4976 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4977 struct net_device *bond_dev) 4978 { 4979 struct bonding *bond = netdev_priv(bond_dev); 4980 struct slave *slave; 4981 4982 slave = bond_xmit_roundrobin_slave_get(bond, skb); 4983 if (likely(slave)) 4984 return bond_dev_queue_xmit(bond, skb, slave->dev); 4985 4986 return bond_tx_drop(bond_dev, skb); 4987 } 4988 4989 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 4990 { 4991 return rcu_dereference(bond->curr_active_slave); 4992 } 4993 4994 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 4995 * the bond has a usable interface. 4996 */ 4997 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 4998 struct net_device *bond_dev) 4999 { 5000 struct bonding *bond = netdev_priv(bond_dev); 5001 struct slave *slave; 5002 5003 slave = bond_xmit_activebackup_slave_get(bond); 5004 if (slave) 5005 return bond_dev_queue_xmit(bond, skb, slave->dev); 5006 5007 return bond_tx_drop(bond_dev, skb); 5008 } 5009 5010 /* Use this to update slave_array when (a) it's not appropriate to update 5011 * slave_array right away (note that update_slave_array() may sleep) 5012 * and / or (b) RTNL is not held. 5013 */ 5014 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 5015 { 5016 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 5017 } 5018 5019 /* Slave array work handler. Holds only RTNL */ 5020 static void bond_slave_arr_handler(struct work_struct *work) 5021 { 5022 struct bonding *bond = container_of(work, struct bonding, 5023 slave_arr_work.work); 5024 int ret; 5025 5026 if (!rtnl_trylock()) 5027 goto err; 5028 5029 ret = bond_update_slave_arr(bond, NULL); 5030 rtnl_unlock(); 5031 if (ret) { 5032 pr_warn_ratelimited("Failed to update slave array from WT\n"); 5033 goto err; 5034 } 5035 return; 5036 5037 err: 5038 bond_slave_arr_work_rearm(bond, 1); 5039 } 5040 5041 static void bond_skip_slave(struct bond_up_slave *slaves, 5042 struct slave *skipslave) 5043 { 5044 int idx; 5045 5046 /* Rare situation where caller has asked to skip a specific 5047 * slave but allocation failed (most likely!). BTW this is 5048 * only possible when the call is initiated from 5049 * __bond_release_one(). In this situation; overwrite the 5050 * skipslave entry in the array with the last entry from the 5051 * array to avoid a situation where the xmit path may choose 5052 * this to-be-skipped slave to send a packet out. 5053 */ 5054 for (idx = 0; slaves && idx < slaves->count; idx++) { 5055 if (skipslave == slaves->arr[idx]) { 5056 slaves->arr[idx] = 5057 slaves->arr[slaves->count - 1]; 5058 slaves->count--; 5059 break; 5060 } 5061 } 5062 } 5063 5064 static void bond_set_slave_arr(struct bonding *bond, 5065 struct bond_up_slave *usable_slaves, 5066 struct bond_up_slave *all_slaves) 5067 { 5068 struct bond_up_slave *usable, *all; 5069 5070 usable = rtnl_dereference(bond->usable_slaves); 5071 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 5072 kfree_rcu(usable, rcu); 5073 5074 all = rtnl_dereference(bond->all_slaves); 5075 rcu_assign_pointer(bond->all_slaves, all_slaves); 5076 kfree_rcu(all, rcu); 5077 } 5078 5079 static void bond_reset_slave_arr(struct bonding *bond) 5080 { 5081 struct bond_up_slave *usable, *all; 5082 5083 usable = rtnl_dereference(bond->usable_slaves); 5084 if (usable) { 5085 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5086 kfree_rcu(usable, rcu); 5087 } 5088 5089 all = rtnl_dereference(bond->all_slaves); 5090 if (all) { 5091 RCU_INIT_POINTER(bond->all_slaves, NULL); 5092 kfree_rcu(all, rcu); 5093 } 5094 } 5095 5096 /* Build the usable slaves array in control path for modes that use xmit-hash 5097 * to determine the slave interface - 5098 * (a) BOND_MODE_8023AD 5099 * (b) BOND_MODE_XOR 5100 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5101 * 5102 * The caller is expected to hold RTNL only and NO other lock! 5103 */ 5104 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5105 { 5106 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5107 struct slave *slave; 5108 struct list_head *iter; 5109 int agg_id = 0; 5110 int ret = 0; 5111 5112 might_sleep(); 5113 5114 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5115 bond->slave_cnt), GFP_KERNEL); 5116 all_slaves = kzalloc(struct_size(all_slaves, arr, 5117 bond->slave_cnt), GFP_KERNEL); 5118 if (!usable_slaves || !all_slaves) { 5119 ret = -ENOMEM; 5120 goto out; 5121 } 5122 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5123 struct ad_info ad_info; 5124 5125 spin_lock_bh(&bond->mode_lock); 5126 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5127 spin_unlock_bh(&bond->mode_lock); 5128 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5129 /* No active aggragator means it's not safe to use 5130 * the previous array. 5131 */ 5132 bond_reset_slave_arr(bond); 5133 goto out; 5134 } 5135 spin_unlock_bh(&bond->mode_lock); 5136 agg_id = ad_info.aggregator_id; 5137 } 5138 bond_for_each_slave(bond, slave, iter) { 5139 if (skipslave == slave) 5140 continue; 5141 5142 all_slaves->arr[all_slaves->count++] = slave; 5143 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5144 struct aggregator *agg; 5145 5146 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5147 if (!agg || agg->aggregator_identifier != agg_id) 5148 continue; 5149 } 5150 if (!bond_slave_can_tx(slave)) 5151 continue; 5152 5153 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5154 usable_slaves->count); 5155 5156 usable_slaves->arr[usable_slaves->count++] = slave; 5157 } 5158 5159 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5160 return ret; 5161 out: 5162 if (ret != 0 && skipslave) { 5163 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5164 skipslave); 5165 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5166 skipslave); 5167 } 5168 kfree_rcu(all_slaves, rcu); 5169 kfree_rcu(usable_slaves, rcu); 5170 5171 return ret; 5172 } 5173 5174 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5175 struct sk_buff *skb, 5176 struct bond_up_slave *slaves) 5177 { 5178 struct slave *slave; 5179 unsigned int count; 5180 u32 hash; 5181 5182 hash = bond_xmit_hash(bond, skb); 5183 count = slaves ? READ_ONCE(slaves->count) : 0; 5184 if (unlikely(!count)) 5185 return NULL; 5186 5187 slave = slaves->arr[hash % count]; 5188 return slave; 5189 } 5190 5191 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5192 struct xdp_buff *xdp) 5193 { 5194 struct bond_up_slave *slaves; 5195 unsigned int count; 5196 u32 hash; 5197 5198 hash = bond_xmit_hash_xdp(bond, xdp); 5199 slaves = rcu_dereference(bond->usable_slaves); 5200 count = slaves ? READ_ONCE(slaves->count) : 0; 5201 if (unlikely(!count)) 5202 return NULL; 5203 5204 return slaves->arr[hash % count]; 5205 } 5206 5207 /* Use this Xmit function for 3AD as well as XOR modes. The current 5208 * usable slave array is formed in the control path. The xmit function 5209 * just calculates hash and sends the packet out. 5210 */ 5211 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5212 struct net_device *dev) 5213 { 5214 struct bonding *bond = netdev_priv(dev); 5215 struct bond_up_slave *slaves; 5216 struct slave *slave; 5217 5218 slaves = rcu_dereference(bond->usable_slaves); 5219 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5220 if (likely(slave)) 5221 return bond_dev_queue_xmit(bond, skb, slave->dev); 5222 5223 return bond_tx_drop(dev, skb); 5224 } 5225 5226 /* in broadcast mode, we send everything to all usable interfaces. */ 5227 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5228 struct net_device *bond_dev) 5229 { 5230 struct bonding *bond = netdev_priv(bond_dev); 5231 struct slave *slave = NULL; 5232 struct list_head *iter; 5233 bool xmit_suc = false; 5234 bool skb_used = false; 5235 5236 bond_for_each_slave_rcu(bond, slave, iter) { 5237 struct sk_buff *skb2; 5238 5239 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5240 continue; 5241 5242 if (bond_is_last_slave(bond, slave)) { 5243 skb2 = skb; 5244 skb_used = true; 5245 } else { 5246 skb2 = skb_clone(skb, GFP_ATOMIC); 5247 if (!skb2) { 5248 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5249 bond_dev->name, __func__); 5250 continue; 5251 } 5252 } 5253 5254 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5255 xmit_suc = true; 5256 } 5257 5258 if (!skb_used) 5259 dev_kfree_skb_any(skb); 5260 5261 if (xmit_suc) 5262 return NETDEV_TX_OK; 5263 5264 dev_core_stats_tx_dropped_inc(bond_dev); 5265 return NET_XMIT_DROP; 5266 } 5267 5268 /*------------------------- Device initialization ---------------------------*/ 5269 5270 /* Lookup the slave that corresponds to a qid */ 5271 static inline int bond_slave_override(struct bonding *bond, 5272 struct sk_buff *skb) 5273 { 5274 struct slave *slave = NULL; 5275 struct list_head *iter; 5276 5277 if (!skb_rx_queue_recorded(skb)) 5278 return 1; 5279 5280 /* Find out if any slaves have the same mapping as this skb. */ 5281 bond_for_each_slave_rcu(bond, slave, iter) { 5282 if (slave->queue_id == skb_get_queue_mapping(skb)) { 5283 if (bond_slave_is_up(slave) && 5284 slave->link == BOND_LINK_UP) { 5285 bond_dev_queue_xmit(bond, skb, slave->dev); 5286 return 0; 5287 } 5288 /* If the slave isn't UP, use default transmit policy. */ 5289 break; 5290 } 5291 } 5292 5293 return 1; 5294 } 5295 5296 5297 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5298 struct net_device *sb_dev) 5299 { 5300 /* This helper function exists to help dev_pick_tx get the correct 5301 * destination queue. Using a helper function skips a call to 5302 * skb_tx_hash and will put the skbs in the queue we expect on their 5303 * way down to the bonding driver. 5304 */ 5305 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5306 5307 /* Save the original txq to restore before passing to the driver */ 5308 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5309 5310 if (unlikely(txq >= dev->real_num_tx_queues)) { 5311 do { 5312 txq -= dev->real_num_tx_queues; 5313 } while (txq >= dev->real_num_tx_queues); 5314 } 5315 return txq; 5316 } 5317 5318 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5319 struct sk_buff *skb, 5320 bool all_slaves) 5321 { 5322 struct bonding *bond = netdev_priv(master_dev); 5323 struct bond_up_slave *slaves; 5324 struct slave *slave = NULL; 5325 5326 switch (BOND_MODE(bond)) { 5327 case BOND_MODE_ROUNDROBIN: 5328 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5329 break; 5330 case BOND_MODE_ACTIVEBACKUP: 5331 slave = bond_xmit_activebackup_slave_get(bond); 5332 break; 5333 case BOND_MODE_8023AD: 5334 case BOND_MODE_XOR: 5335 if (all_slaves) 5336 slaves = rcu_dereference(bond->all_slaves); 5337 else 5338 slaves = rcu_dereference(bond->usable_slaves); 5339 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5340 break; 5341 case BOND_MODE_BROADCAST: 5342 break; 5343 case BOND_MODE_ALB: 5344 slave = bond_xmit_alb_slave_get(bond, skb); 5345 break; 5346 case BOND_MODE_TLB: 5347 slave = bond_xmit_tlb_slave_get(bond, skb); 5348 break; 5349 default: 5350 /* Should never happen, mode already checked */ 5351 WARN_ONCE(true, "Unknown bonding mode"); 5352 break; 5353 } 5354 5355 if (slave) 5356 return slave->dev; 5357 return NULL; 5358 } 5359 5360 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5361 { 5362 switch (sk->sk_family) { 5363 #if IS_ENABLED(CONFIG_IPV6) 5364 case AF_INET6: 5365 if (ipv6_only_sock(sk) || 5366 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5367 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5368 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5369 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5370 break; 5371 } 5372 fallthrough; 5373 #endif 5374 default: /* AF_INET */ 5375 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5376 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5377 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5378 break; 5379 } 5380 5381 flow->ports.src = inet_sk(sk)->inet_sport; 5382 flow->ports.dst = inet_sk(sk)->inet_dport; 5383 } 5384 5385 /** 5386 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5387 * @sk: socket to use for headers 5388 * 5389 * This function will extract the necessary field from the socket and use 5390 * them to generate a hash based on the LAYER34 xmit_policy. 5391 * Assumes that sk is a TCP or UDP socket. 5392 */ 5393 static u32 bond_sk_hash_l34(struct sock *sk) 5394 { 5395 struct flow_keys flow; 5396 u32 hash; 5397 5398 bond_sk_to_flow(sk, &flow); 5399 5400 /* L4 */ 5401 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5402 /* L3 */ 5403 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5404 } 5405 5406 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5407 struct sock *sk) 5408 { 5409 struct bond_up_slave *slaves; 5410 struct slave *slave; 5411 unsigned int count; 5412 u32 hash; 5413 5414 slaves = rcu_dereference(bond->usable_slaves); 5415 count = slaves ? READ_ONCE(slaves->count) : 0; 5416 if (unlikely(!count)) 5417 return NULL; 5418 5419 hash = bond_sk_hash_l34(sk); 5420 slave = slaves->arr[hash % count]; 5421 5422 return slave->dev; 5423 } 5424 5425 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5426 struct sock *sk) 5427 { 5428 struct bonding *bond = netdev_priv(dev); 5429 struct net_device *lower = NULL; 5430 5431 rcu_read_lock(); 5432 if (bond_sk_check(bond)) 5433 lower = __bond_sk_get_lower_dev(bond, sk); 5434 rcu_read_unlock(); 5435 5436 return lower; 5437 } 5438 5439 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5440 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5441 struct net_device *dev) 5442 { 5443 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5444 5445 /* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded 5446 * was true, if tls_device_down is running in parallel, but it's OK, 5447 * because bond_get_slave_by_dev has a NULL check. 5448 */ 5449 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5450 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5451 return bond_tx_drop(dev, skb); 5452 } 5453 #endif 5454 5455 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5456 { 5457 struct bonding *bond = netdev_priv(dev); 5458 5459 if (bond_should_override_tx_queue(bond) && 5460 !bond_slave_override(bond, skb)) 5461 return NETDEV_TX_OK; 5462 5463 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5464 if (tls_is_skb_tx_device_offloaded(skb)) 5465 return bond_tls_device_xmit(bond, skb, dev); 5466 #endif 5467 5468 switch (BOND_MODE(bond)) { 5469 case BOND_MODE_ROUNDROBIN: 5470 return bond_xmit_roundrobin(skb, dev); 5471 case BOND_MODE_ACTIVEBACKUP: 5472 return bond_xmit_activebackup(skb, dev); 5473 case BOND_MODE_8023AD: 5474 case BOND_MODE_XOR: 5475 return bond_3ad_xor_xmit(skb, dev); 5476 case BOND_MODE_BROADCAST: 5477 return bond_xmit_broadcast(skb, dev); 5478 case BOND_MODE_ALB: 5479 return bond_alb_xmit(skb, dev); 5480 case BOND_MODE_TLB: 5481 return bond_tlb_xmit(skb, dev); 5482 default: 5483 /* Should never happen, mode already checked */ 5484 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5485 WARN_ON_ONCE(1); 5486 return bond_tx_drop(dev, skb); 5487 } 5488 } 5489 5490 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5491 { 5492 struct bonding *bond = netdev_priv(dev); 5493 netdev_tx_t ret = NETDEV_TX_OK; 5494 5495 /* If we risk deadlock from transmitting this in the 5496 * netpoll path, tell netpoll to queue the frame for later tx 5497 */ 5498 if (unlikely(is_netpoll_tx_blocked(dev))) 5499 return NETDEV_TX_BUSY; 5500 5501 rcu_read_lock(); 5502 if (bond_has_slaves(bond)) 5503 ret = __bond_start_xmit(skb, dev); 5504 else 5505 ret = bond_tx_drop(dev, skb); 5506 rcu_read_unlock(); 5507 5508 return ret; 5509 } 5510 5511 static struct net_device * 5512 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5513 { 5514 struct bonding *bond = netdev_priv(bond_dev); 5515 struct slave *slave; 5516 5517 /* Caller needs to hold rcu_read_lock() */ 5518 5519 switch (BOND_MODE(bond)) { 5520 case BOND_MODE_ROUNDROBIN: 5521 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5522 break; 5523 5524 case BOND_MODE_ACTIVEBACKUP: 5525 slave = bond_xmit_activebackup_slave_get(bond); 5526 break; 5527 5528 case BOND_MODE_8023AD: 5529 case BOND_MODE_XOR: 5530 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5531 break; 5532 5533 default: 5534 /* Should never happen. Mode guarded by bond_xdp_check() */ 5535 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5536 WARN_ON_ONCE(1); 5537 return NULL; 5538 } 5539 5540 if (slave) 5541 return slave->dev; 5542 5543 return NULL; 5544 } 5545 5546 static int bond_xdp_xmit(struct net_device *bond_dev, 5547 int n, struct xdp_frame **frames, u32 flags) 5548 { 5549 int nxmit, err = -ENXIO; 5550 5551 rcu_read_lock(); 5552 5553 for (nxmit = 0; nxmit < n; nxmit++) { 5554 struct xdp_frame *frame = frames[nxmit]; 5555 struct xdp_frame *frames1[] = {frame}; 5556 struct net_device *slave_dev; 5557 struct xdp_buff xdp; 5558 5559 xdp_convert_frame_to_buff(frame, &xdp); 5560 5561 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5562 if (!slave_dev) { 5563 err = -ENXIO; 5564 break; 5565 } 5566 5567 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5568 if (err < 1) 5569 break; 5570 } 5571 5572 rcu_read_unlock(); 5573 5574 /* If error happened on the first frame then we can pass the error up, otherwise 5575 * report the number of frames that were xmitted. 5576 */ 5577 if (err < 0) 5578 return (nxmit == 0 ? err : nxmit); 5579 5580 return nxmit; 5581 } 5582 5583 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5584 struct netlink_ext_ack *extack) 5585 { 5586 struct bonding *bond = netdev_priv(dev); 5587 struct list_head *iter; 5588 struct slave *slave, *rollback_slave; 5589 struct bpf_prog *old_prog; 5590 struct netdev_bpf xdp = { 5591 .command = XDP_SETUP_PROG, 5592 .flags = 0, 5593 .prog = prog, 5594 .extack = extack, 5595 }; 5596 int err; 5597 5598 ASSERT_RTNL(); 5599 5600 if (!bond_xdp_check(bond)) 5601 return -EOPNOTSUPP; 5602 5603 old_prog = bond->xdp_prog; 5604 bond->xdp_prog = prog; 5605 5606 bond_for_each_slave(bond, slave, iter) { 5607 struct net_device *slave_dev = slave->dev; 5608 5609 if (!slave_dev->netdev_ops->ndo_bpf || 5610 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5611 SLAVE_NL_ERR(dev, slave_dev, extack, 5612 "Slave device does not support XDP"); 5613 err = -EOPNOTSUPP; 5614 goto err; 5615 } 5616 5617 if (dev_xdp_prog_count(slave_dev) > 0) { 5618 SLAVE_NL_ERR(dev, slave_dev, extack, 5619 "Slave has XDP program loaded, please unload before enslaving"); 5620 err = -EOPNOTSUPP; 5621 goto err; 5622 } 5623 5624 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5625 if (err < 0) { 5626 /* ndo_bpf() sets extack error message */ 5627 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5628 goto err; 5629 } 5630 if (prog) 5631 bpf_prog_inc(prog); 5632 } 5633 5634 if (prog) { 5635 static_branch_inc(&bpf_master_redirect_enabled_key); 5636 } else if (old_prog) { 5637 bpf_prog_put(old_prog); 5638 static_branch_dec(&bpf_master_redirect_enabled_key); 5639 } 5640 5641 return 0; 5642 5643 err: 5644 /* unwind the program changes */ 5645 bond->xdp_prog = old_prog; 5646 xdp.prog = old_prog; 5647 xdp.extack = NULL; /* do not overwrite original error */ 5648 5649 bond_for_each_slave(bond, rollback_slave, iter) { 5650 struct net_device *slave_dev = rollback_slave->dev; 5651 int err_unwind; 5652 5653 if (slave == rollback_slave) 5654 break; 5655 5656 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5657 if (err_unwind < 0) 5658 slave_err(dev, slave_dev, 5659 "Error %d when unwinding XDP program change\n", err_unwind); 5660 else if (xdp.prog) 5661 bpf_prog_inc(xdp.prog); 5662 } 5663 return err; 5664 } 5665 5666 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5667 { 5668 switch (xdp->command) { 5669 case XDP_SETUP_PROG: 5670 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5671 default: 5672 return -EINVAL; 5673 } 5674 } 5675 5676 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5677 { 5678 if (speed == 0 || speed == SPEED_UNKNOWN) 5679 speed = slave->speed; 5680 else 5681 speed = min(speed, slave->speed); 5682 5683 return speed; 5684 } 5685 5686 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5687 struct ethtool_link_ksettings *cmd) 5688 { 5689 struct bonding *bond = netdev_priv(bond_dev); 5690 struct list_head *iter; 5691 struct slave *slave; 5692 u32 speed = 0; 5693 5694 cmd->base.duplex = DUPLEX_UNKNOWN; 5695 cmd->base.port = PORT_OTHER; 5696 5697 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5698 * do not need to check mode. Though link speed might not represent 5699 * the true receive or transmit bandwidth (not all modes are symmetric) 5700 * this is an accurate maximum. 5701 */ 5702 bond_for_each_slave(bond, slave, iter) { 5703 if (bond_slave_can_tx(slave)) { 5704 if (slave->speed != SPEED_UNKNOWN) { 5705 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5706 speed = bond_mode_bcast_speed(slave, 5707 speed); 5708 else 5709 speed += slave->speed; 5710 } 5711 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5712 slave->duplex != DUPLEX_UNKNOWN) 5713 cmd->base.duplex = slave->duplex; 5714 } 5715 } 5716 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5717 5718 return 0; 5719 } 5720 5721 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5722 struct ethtool_drvinfo *drvinfo) 5723 { 5724 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5725 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5726 BOND_ABI_VERSION); 5727 } 5728 5729 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5730 struct ethtool_ts_info *info) 5731 { 5732 struct bonding *bond = netdev_priv(bond_dev); 5733 struct ethtool_ts_info ts_info; 5734 const struct ethtool_ops *ops; 5735 struct net_device *real_dev; 5736 bool sw_tx_support = false; 5737 struct phy_device *phydev; 5738 struct list_head *iter; 5739 struct slave *slave; 5740 int ret = 0; 5741 5742 rcu_read_lock(); 5743 real_dev = bond_option_active_slave_get_rcu(bond); 5744 dev_hold(real_dev); 5745 rcu_read_unlock(); 5746 5747 if (real_dev) { 5748 ops = real_dev->ethtool_ops; 5749 phydev = real_dev->phydev; 5750 5751 if (phy_has_tsinfo(phydev)) { 5752 ret = phy_ts_info(phydev, info); 5753 goto out; 5754 } else if (ops->get_ts_info) { 5755 ret = ops->get_ts_info(real_dev, info); 5756 goto out; 5757 } 5758 } else { 5759 /* Check if all slaves support software tx timestamping */ 5760 rcu_read_lock(); 5761 bond_for_each_slave_rcu(bond, slave, iter) { 5762 ret = -1; 5763 ops = slave->dev->ethtool_ops; 5764 phydev = slave->dev->phydev; 5765 5766 if (phy_has_tsinfo(phydev)) 5767 ret = phy_ts_info(phydev, &ts_info); 5768 else if (ops->get_ts_info) 5769 ret = ops->get_ts_info(slave->dev, &ts_info); 5770 5771 if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) { 5772 sw_tx_support = true; 5773 continue; 5774 } 5775 5776 sw_tx_support = false; 5777 break; 5778 } 5779 rcu_read_unlock(); 5780 } 5781 5782 ret = 0; 5783 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5784 SOF_TIMESTAMPING_SOFTWARE; 5785 if (sw_tx_support) 5786 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE; 5787 5788 info->phc_index = -1; 5789 5790 out: 5791 dev_put(real_dev); 5792 return ret; 5793 } 5794 5795 static const struct ethtool_ops bond_ethtool_ops = { 5796 .get_drvinfo = bond_ethtool_get_drvinfo, 5797 .get_link = ethtool_op_get_link, 5798 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5799 .get_ts_info = bond_ethtool_get_ts_info, 5800 }; 5801 5802 static const struct net_device_ops bond_netdev_ops = { 5803 .ndo_init = bond_init, 5804 .ndo_uninit = bond_uninit, 5805 .ndo_open = bond_open, 5806 .ndo_stop = bond_close, 5807 .ndo_start_xmit = bond_start_xmit, 5808 .ndo_select_queue = bond_select_queue, 5809 .ndo_get_stats64 = bond_get_stats, 5810 .ndo_eth_ioctl = bond_eth_ioctl, 5811 .ndo_siocbond = bond_do_ioctl, 5812 .ndo_siocdevprivate = bond_siocdevprivate, 5813 .ndo_change_rx_flags = bond_change_rx_flags, 5814 .ndo_set_rx_mode = bond_set_rx_mode, 5815 .ndo_change_mtu = bond_change_mtu, 5816 .ndo_set_mac_address = bond_set_mac_address, 5817 .ndo_neigh_setup = bond_neigh_setup, 5818 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5819 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5820 #ifdef CONFIG_NET_POLL_CONTROLLER 5821 .ndo_netpoll_setup = bond_netpoll_setup, 5822 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5823 .ndo_poll_controller = bond_poll_controller, 5824 #endif 5825 .ndo_add_slave = bond_enslave, 5826 .ndo_del_slave = bond_release, 5827 .ndo_fix_features = bond_fix_features, 5828 .ndo_features_check = passthru_features_check, 5829 .ndo_get_xmit_slave = bond_xmit_get_slave, 5830 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5831 .ndo_bpf = bond_xdp, 5832 .ndo_xdp_xmit = bond_xdp_xmit, 5833 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5834 }; 5835 5836 static const struct device_type bond_type = { 5837 .name = "bond", 5838 }; 5839 5840 static void bond_destructor(struct net_device *bond_dev) 5841 { 5842 struct bonding *bond = netdev_priv(bond_dev); 5843 5844 if (bond->wq) 5845 destroy_workqueue(bond->wq); 5846 5847 if (bond->rr_tx_counter) 5848 free_percpu(bond->rr_tx_counter); 5849 } 5850 5851 void bond_setup(struct net_device *bond_dev) 5852 { 5853 struct bonding *bond = netdev_priv(bond_dev); 5854 5855 spin_lock_init(&bond->mode_lock); 5856 bond->params = bonding_defaults; 5857 5858 /* Initialize pointers */ 5859 bond->dev = bond_dev; 5860 5861 /* Initialize the device entry points */ 5862 ether_setup(bond_dev); 5863 bond_dev->max_mtu = ETH_MAX_MTU; 5864 bond_dev->netdev_ops = &bond_netdev_ops; 5865 bond_dev->ethtool_ops = &bond_ethtool_ops; 5866 5867 bond_dev->needs_free_netdev = true; 5868 bond_dev->priv_destructor = bond_destructor; 5869 5870 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5871 5872 /* Initialize the device options */ 5873 bond_dev->flags |= IFF_MASTER; 5874 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5875 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5876 5877 #ifdef CONFIG_XFRM_OFFLOAD 5878 /* set up xfrm device ops (only supported in active-backup right now) */ 5879 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5880 INIT_LIST_HEAD(&bond->ipsec_list); 5881 spin_lock_init(&bond->ipsec_lock); 5882 #endif /* CONFIG_XFRM_OFFLOAD */ 5883 5884 /* don't acquire bond device's netif_tx_lock when transmitting */ 5885 bond_dev->features |= NETIF_F_LLTX; 5886 5887 /* By default, we declare the bond to be fully 5888 * VLAN hardware accelerated capable. Special 5889 * care is taken in the various xmit functions 5890 * when there are slaves that are not hw accel 5891 * capable 5892 */ 5893 5894 /* Don't allow bond devices to change network namespaces. */ 5895 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5896 5897 bond_dev->hw_features = BOND_VLAN_FEATURES | 5898 NETIF_F_HW_VLAN_CTAG_RX | 5899 NETIF_F_HW_VLAN_CTAG_FILTER; 5900 5901 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5902 bond_dev->features |= bond_dev->hw_features; 5903 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5904 #ifdef CONFIG_XFRM_OFFLOAD 5905 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5906 /* Only enable XFRM features if this is an active-backup config */ 5907 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5908 bond_dev->features |= BOND_XFRM_FEATURES; 5909 #endif /* CONFIG_XFRM_OFFLOAD */ 5910 5911 if (bond_xdp_check(bond)) 5912 bond_dev->xdp_features = NETDEV_XDP_ACT_MASK; 5913 } 5914 5915 /* Destroy a bonding device. 5916 * Must be under rtnl_lock when this function is called. 5917 */ 5918 static void bond_uninit(struct net_device *bond_dev) 5919 { 5920 struct bonding *bond = netdev_priv(bond_dev); 5921 struct bond_up_slave *usable, *all; 5922 struct list_head *iter; 5923 struct slave *slave; 5924 5925 bond_netpoll_cleanup(bond_dev); 5926 5927 /* Release the bonded slaves */ 5928 bond_for_each_slave(bond, slave, iter) 5929 __bond_release_one(bond_dev, slave->dev, true, true); 5930 netdev_info(bond_dev, "Released all slaves\n"); 5931 5932 usable = rtnl_dereference(bond->usable_slaves); 5933 if (usable) { 5934 RCU_INIT_POINTER(bond->usable_slaves, NULL); 5935 kfree_rcu(usable, rcu); 5936 } 5937 5938 all = rtnl_dereference(bond->all_slaves); 5939 if (all) { 5940 RCU_INIT_POINTER(bond->all_slaves, NULL); 5941 kfree_rcu(all, rcu); 5942 } 5943 5944 list_del(&bond->bond_list); 5945 5946 bond_debug_unregister(bond); 5947 } 5948 5949 /*------------------------- Module initialization ---------------------------*/ 5950 5951 static int bond_check_params(struct bond_params *params) 5952 { 5953 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5954 struct bond_opt_value newval; 5955 const struct bond_opt_value *valptr; 5956 int arp_all_targets_value = 0; 5957 u16 ad_actor_sys_prio = 0; 5958 u16 ad_user_port_key = 0; 5959 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5960 int arp_ip_count; 5961 int bond_mode = BOND_MODE_ROUNDROBIN; 5962 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 5963 int lacp_fast = 0; 5964 int tlb_dynamic_lb; 5965 5966 /* Convert string parameters. */ 5967 if (mode) { 5968 bond_opt_initstr(&newval, mode); 5969 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 5970 if (!valptr) { 5971 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 5972 return -EINVAL; 5973 } 5974 bond_mode = valptr->value; 5975 } 5976 5977 if (xmit_hash_policy) { 5978 if (bond_mode == BOND_MODE_ROUNDROBIN || 5979 bond_mode == BOND_MODE_ACTIVEBACKUP || 5980 bond_mode == BOND_MODE_BROADCAST) { 5981 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 5982 bond_mode_name(bond_mode)); 5983 } else { 5984 bond_opt_initstr(&newval, xmit_hash_policy); 5985 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 5986 &newval); 5987 if (!valptr) { 5988 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 5989 xmit_hash_policy); 5990 return -EINVAL; 5991 } 5992 xmit_hashtype = valptr->value; 5993 } 5994 } 5995 5996 if (lacp_rate) { 5997 if (bond_mode != BOND_MODE_8023AD) { 5998 pr_info("lacp_rate param is irrelevant in mode %s\n", 5999 bond_mode_name(bond_mode)); 6000 } else { 6001 bond_opt_initstr(&newval, lacp_rate); 6002 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 6003 &newval); 6004 if (!valptr) { 6005 pr_err("Error: Invalid lacp rate \"%s\"\n", 6006 lacp_rate); 6007 return -EINVAL; 6008 } 6009 lacp_fast = valptr->value; 6010 } 6011 } 6012 6013 if (ad_select) { 6014 bond_opt_initstr(&newval, ad_select); 6015 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 6016 &newval); 6017 if (!valptr) { 6018 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 6019 return -EINVAL; 6020 } 6021 params->ad_select = valptr->value; 6022 if (bond_mode != BOND_MODE_8023AD) 6023 pr_warn("ad_select param only affects 802.3ad mode\n"); 6024 } else { 6025 params->ad_select = BOND_AD_STABLE; 6026 } 6027 6028 if (max_bonds < 0) { 6029 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 6030 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 6031 max_bonds = BOND_DEFAULT_MAX_BONDS; 6032 } 6033 6034 if (miimon < 0) { 6035 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6036 miimon, INT_MAX); 6037 miimon = 0; 6038 } 6039 6040 if (updelay < 0) { 6041 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6042 updelay, INT_MAX); 6043 updelay = 0; 6044 } 6045 6046 if (downdelay < 0) { 6047 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6048 downdelay, INT_MAX); 6049 downdelay = 0; 6050 } 6051 6052 if ((use_carrier != 0) && (use_carrier != 1)) { 6053 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 6054 use_carrier); 6055 use_carrier = 1; 6056 } 6057 6058 if (num_peer_notif < 0 || num_peer_notif > 255) { 6059 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 6060 num_peer_notif); 6061 num_peer_notif = 1; 6062 } 6063 6064 /* reset values for 802.3ad/TLB/ALB */ 6065 if (!bond_mode_uses_arp(bond_mode)) { 6066 if (!miimon) { 6067 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"); 6068 pr_warn("Forcing miimon to 100msec\n"); 6069 miimon = BOND_DEFAULT_MIIMON; 6070 } 6071 } 6072 6073 if (tx_queues < 1 || tx_queues > 255) { 6074 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 6075 tx_queues, BOND_DEFAULT_TX_QUEUES); 6076 tx_queues = BOND_DEFAULT_TX_QUEUES; 6077 } 6078 6079 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 6080 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 6081 all_slaves_active); 6082 all_slaves_active = 0; 6083 } 6084 6085 if (resend_igmp < 0 || resend_igmp > 255) { 6086 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 6087 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 6088 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 6089 } 6090 6091 bond_opt_initval(&newval, packets_per_slave); 6092 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 6093 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 6094 packets_per_slave, USHRT_MAX); 6095 packets_per_slave = 1; 6096 } 6097 6098 if (bond_mode == BOND_MODE_ALB) { 6099 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", 6100 updelay); 6101 } 6102 6103 if (!miimon) { 6104 if (updelay || downdelay) { 6105 /* just warn the user the up/down delay will have 6106 * no effect since miimon is zero... 6107 */ 6108 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", 6109 updelay, downdelay); 6110 } 6111 } else { 6112 /* don't allow arp monitoring */ 6113 if (arp_interval) { 6114 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 6115 miimon, arp_interval); 6116 arp_interval = 0; 6117 } 6118 6119 if ((updelay % miimon) != 0) { 6120 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6121 updelay, miimon, (updelay / miimon) * miimon); 6122 } 6123 6124 updelay /= miimon; 6125 6126 if ((downdelay % miimon) != 0) { 6127 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6128 downdelay, miimon, 6129 (downdelay / miimon) * miimon); 6130 } 6131 6132 downdelay /= miimon; 6133 } 6134 6135 if (arp_interval < 0) { 6136 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6137 arp_interval, INT_MAX); 6138 arp_interval = 0; 6139 } 6140 6141 for (arp_ip_count = 0, i = 0; 6142 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6143 __be32 ip; 6144 6145 /* not a complete check, but good enough to catch mistakes */ 6146 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6147 !bond_is_ip_target_ok(ip)) { 6148 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6149 arp_ip_target[i]); 6150 arp_interval = 0; 6151 } else { 6152 if (bond_get_targets_ip(arp_target, ip) == -1) 6153 arp_target[arp_ip_count++] = ip; 6154 else 6155 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6156 &ip); 6157 } 6158 } 6159 6160 if (arp_interval && !arp_ip_count) { 6161 /* don't allow arping if no arp_ip_target given... */ 6162 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6163 arp_interval); 6164 arp_interval = 0; 6165 } 6166 6167 if (arp_validate) { 6168 if (!arp_interval) { 6169 pr_err("arp_validate requires arp_interval\n"); 6170 return -EINVAL; 6171 } 6172 6173 bond_opt_initstr(&newval, arp_validate); 6174 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6175 &newval); 6176 if (!valptr) { 6177 pr_err("Error: invalid arp_validate \"%s\"\n", 6178 arp_validate); 6179 return -EINVAL; 6180 } 6181 arp_validate_value = valptr->value; 6182 } else { 6183 arp_validate_value = 0; 6184 } 6185 6186 if (arp_all_targets) { 6187 bond_opt_initstr(&newval, arp_all_targets); 6188 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6189 &newval); 6190 if (!valptr) { 6191 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6192 arp_all_targets); 6193 arp_all_targets_value = 0; 6194 } else { 6195 arp_all_targets_value = valptr->value; 6196 } 6197 } 6198 6199 if (miimon) { 6200 pr_info("MII link monitoring set to %d ms\n", miimon); 6201 } else if (arp_interval) { 6202 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6203 arp_validate_value); 6204 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6205 arp_interval, valptr->string, arp_ip_count); 6206 6207 for (i = 0; i < arp_ip_count; i++) 6208 pr_cont(" %s", arp_ip_target[i]); 6209 6210 pr_cont("\n"); 6211 6212 } else if (max_bonds) { 6213 /* miimon and arp_interval not set, we need one so things 6214 * work as expected, see bonding.txt for details 6215 */ 6216 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"); 6217 } 6218 6219 if (primary && !bond_mode_uses_primary(bond_mode)) { 6220 /* currently, using a primary only makes sense 6221 * in active backup, TLB or ALB modes 6222 */ 6223 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6224 primary, bond_mode_name(bond_mode)); 6225 primary = NULL; 6226 } 6227 6228 if (primary && primary_reselect) { 6229 bond_opt_initstr(&newval, primary_reselect); 6230 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6231 &newval); 6232 if (!valptr) { 6233 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6234 primary_reselect); 6235 return -EINVAL; 6236 } 6237 primary_reselect_value = valptr->value; 6238 } else { 6239 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6240 } 6241 6242 if (fail_over_mac) { 6243 bond_opt_initstr(&newval, fail_over_mac); 6244 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6245 &newval); 6246 if (!valptr) { 6247 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6248 fail_over_mac); 6249 return -EINVAL; 6250 } 6251 fail_over_mac_value = valptr->value; 6252 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6253 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6254 } else { 6255 fail_over_mac_value = BOND_FOM_NONE; 6256 } 6257 6258 bond_opt_initstr(&newval, "default"); 6259 valptr = bond_opt_parse( 6260 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6261 &newval); 6262 if (!valptr) { 6263 pr_err("Error: No ad_actor_sys_prio default value"); 6264 return -EINVAL; 6265 } 6266 ad_actor_sys_prio = valptr->value; 6267 6268 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6269 &newval); 6270 if (!valptr) { 6271 pr_err("Error: No ad_user_port_key default value"); 6272 return -EINVAL; 6273 } 6274 ad_user_port_key = valptr->value; 6275 6276 bond_opt_initstr(&newval, "default"); 6277 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6278 if (!valptr) { 6279 pr_err("Error: No tlb_dynamic_lb default value"); 6280 return -EINVAL; 6281 } 6282 tlb_dynamic_lb = valptr->value; 6283 6284 if (lp_interval == 0) { 6285 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6286 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6287 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6288 } 6289 6290 /* fill params struct with the proper values */ 6291 params->mode = bond_mode; 6292 params->xmit_policy = xmit_hashtype; 6293 params->miimon = miimon; 6294 params->num_peer_notif = num_peer_notif; 6295 params->arp_interval = arp_interval; 6296 params->arp_validate = arp_validate_value; 6297 params->arp_all_targets = arp_all_targets_value; 6298 params->missed_max = 2; 6299 params->updelay = updelay; 6300 params->downdelay = downdelay; 6301 params->peer_notif_delay = 0; 6302 params->use_carrier = use_carrier; 6303 params->lacp_active = 1; 6304 params->lacp_fast = lacp_fast; 6305 params->primary[0] = 0; 6306 params->primary_reselect = primary_reselect_value; 6307 params->fail_over_mac = fail_over_mac_value; 6308 params->tx_queues = tx_queues; 6309 params->all_slaves_active = all_slaves_active; 6310 params->resend_igmp = resend_igmp; 6311 params->min_links = min_links; 6312 params->lp_interval = lp_interval; 6313 params->packets_per_slave = packets_per_slave; 6314 params->tlb_dynamic_lb = tlb_dynamic_lb; 6315 params->ad_actor_sys_prio = ad_actor_sys_prio; 6316 eth_zero_addr(params->ad_actor_system); 6317 params->ad_user_port_key = ad_user_port_key; 6318 if (packets_per_slave > 0) { 6319 params->reciprocal_packets_per_slave = 6320 reciprocal_value(packets_per_slave); 6321 } else { 6322 /* reciprocal_packets_per_slave is unused if 6323 * packets_per_slave is 0 or 1, just initialize it 6324 */ 6325 params->reciprocal_packets_per_slave = 6326 (struct reciprocal_value) { 0 }; 6327 } 6328 6329 if (primary) 6330 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6331 6332 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6333 #if IS_ENABLED(CONFIG_IPV6) 6334 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6335 #endif 6336 6337 return 0; 6338 } 6339 6340 /* Called from registration process */ 6341 static int bond_init(struct net_device *bond_dev) 6342 { 6343 struct bonding *bond = netdev_priv(bond_dev); 6344 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6345 6346 netdev_dbg(bond_dev, "Begin bond_init\n"); 6347 6348 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6349 if (!bond->wq) 6350 return -ENOMEM; 6351 6352 bond->notifier_ctx = false; 6353 6354 spin_lock_init(&bond->stats_lock); 6355 netdev_lockdep_set_classes(bond_dev); 6356 6357 list_add_tail(&bond->bond_list, &bn->dev_list); 6358 6359 bond_prepare_sysfs_group(bond); 6360 6361 bond_debug_register(bond); 6362 6363 /* Ensure valid dev_addr */ 6364 if (is_zero_ether_addr(bond_dev->dev_addr) && 6365 bond_dev->addr_assign_type == NET_ADDR_PERM) 6366 eth_hw_addr_random(bond_dev); 6367 6368 return 0; 6369 } 6370 6371 unsigned int bond_get_num_tx_queues(void) 6372 { 6373 return tx_queues; 6374 } 6375 6376 /* Create a new bond based on the specified name and bonding parameters. 6377 * If name is NULL, obtain a suitable "bond%d" name for us. 6378 * Caller must NOT hold rtnl_lock; we need to release it here before we 6379 * set up our sysfs entries. 6380 */ 6381 int bond_create(struct net *net, const char *name) 6382 { 6383 struct net_device *bond_dev; 6384 struct bonding *bond; 6385 int res = -ENOMEM; 6386 6387 rtnl_lock(); 6388 6389 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6390 name ? name : "bond%d", NET_NAME_UNKNOWN, 6391 bond_setup, tx_queues); 6392 if (!bond_dev) 6393 goto out; 6394 6395 bond = netdev_priv(bond_dev); 6396 dev_net_set(bond_dev, net); 6397 bond_dev->rtnl_link_ops = &bond_link_ops; 6398 6399 res = register_netdevice(bond_dev); 6400 if (res < 0) { 6401 free_netdev(bond_dev); 6402 goto out; 6403 } 6404 6405 netif_carrier_off(bond_dev); 6406 6407 bond_work_init_all(bond); 6408 6409 out: 6410 rtnl_unlock(); 6411 return res; 6412 } 6413 6414 static int __net_init bond_net_init(struct net *net) 6415 { 6416 struct bond_net *bn = net_generic(net, bond_net_id); 6417 6418 bn->net = net; 6419 INIT_LIST_HEAD(&bn->dev_list); 6420 6421 bond_create_proc_dir(bn); 6422 bond_create_sysfs(bn); 6423 6424 return 0; 6425 } 6426 6427 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6428 { 6429 struct bond_net *bn; 6430 struct net *net; 6431 LIST_HEAD(list); 6432 6433 list_for_each_entry(net, net_list, exit_list) { 6434 bn = net_generic(net, bond_net_id); 6435 bond_destroy_sysfs(bn); 6436 } 6437 6438 /* Kill off any bonds created after unregistering bond rtnl ops */ 6439 rtnl_lock(); 6440 list_for_each_entry(net, net_list, exit_list) { 6441 struct bonding *bond, *tmp_bond; 6442 6443 bn = net_generic(net, bond_net_id); 6444 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6445 unregister_netdevice_queue(bond->dev, &list); 6446 } 6447 unregister_netdevice_many(&list); 6448 rtnl_unlock(); 6449 6450 list_for_each_entry(net, net_list, exit_list) { 6451 bn = net_generic(net, bond_net_id); 6452 bond_destroy_proc_dir(bn); 6453 } 6454 } 6455 6456 static struct pernet_operations bond_net_ops = { 6457 .init = bond_net_init, 6458 .exit_batch = bond_net_exit_batch, 6459 .id = &bond_net_id, 6460 .size = sizeof(struct bond_net), 6461 }; 6462 6463 static int __init bonding_init(void) 6464 { 6465 int i; 6466 int res; 6467 6468 res = bond_check_params(&bonding_defaults); 6469 if (res) 6470 goto out; 6471 6472 res = register_pernet_subsys(&bond_net_ops); 6473 if (res) 6474 goto out; 6475 6476 res = bond_netlink_init(); 6477 if (res) 6478 goto err_link; 6479 6480 bond_create_debugfs(); 6481 6482 for (i = 0; i < max_bonds; i++) { 6483 res = bond_create(&init_net, NULL); 6484 if (res) 6485 goto err; 6486 } 6487 6488 skb_flow_dissector_init(&flow_keys_bonding, 6489 flow_keys_bonding_keys, 6490 ARRAY_SIZE(flow_keys_bonding_keys)); 6491 6492 register_netdevice_notifier(&bond_netdev_notifier); 6493 out: 6494 return res; 6495 err: 6496 bond_destroy_debugfs(); 6497 bond_netlink_fini(); 6498 err_link: 6499 unregister_pernet_subsys(&bond_net_ops); 6500 goto out; 6501 6502 } 6503 6504 static void __exit bonding_exit(void) 6505 { 6506 unregister_netdevice_notifier(&bond_netdev_notifier); 6507 6508 bond_destroy_debugfs(); 6509 6510 bond_netlink_fini(); 6511 unregister_pernet_subsys(&bond_net_ops); 6512 6513 #ifdef CONFIG_NET_POLL_CONTROLLER 6514 /* Make sure we don't have an imbalance on our netpoll blocking */ 6515 WARN_ON(atomic_read(&netpoll_block_tx)); 6516 #endif 6517 } 6518 6519 module_init(bonding_init); 6520 module_exit(bonding_exit); 6521 MODULE_LICENSE("GPL"); 6522 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6523 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6524