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 #include <net/xdp.h> 94 95 #include "bonding_priv.h" 96 97 /*---------------------------- Module parameters ----------------------------*/ 98 99 /* monitor all links that often (in milliseconds). <=0 disables monitoring */ 100 101 static int max_bonds = BOND_DEFAULT_MAX_BONDS; 102 static int tx_queues = BOND_DEFAULT_TX_QUEUES; 103 static int num_peer_notif = 1; 104 static int miimon; 105 static int updelay; 106 static int downdelay; 107 static int use_carrier = 1; 108 static char *mode; 109 static char *primary; 110 static char *primary_reselect; 111 static char *lacp_rate; 112 static int min_links; 113 static char *ad_select; 114 static char *xmit_hash_policy; 115 static int arp_interval; 116 static char *arp_ip_target[BOND_MAX_ARP_TARGETS]; 117 static char *arp_validate; 118 static char *arp_all_targets; 119 static char *fail_over_mac; 120 static int all_slaves_active; 121 static struct bond_params bonding_defaults; 122 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP; 123 static int packets_per_slave = 1; 124 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 125 126 module_param(max_bonds, int, 0); 127 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices"); 128 module_param(tx_queues, int, 0); 129 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)"); 130 module_param_named(num_grat_arp, num_peer_notif, int, 0644); 131 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on " 132 "failover event (alias of num_unsol_na)"); 133 module_param_named(num_unsol_na, num_peer_notif, int, 0644); 134 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on " 135 "failover event (alias of num_grat_arp)"); 136 module_param(miimon, int, 0); 137 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds"); 138 module_param(updelay, int, 0); 139 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds"); 140 module_param(downdelay, int, 0); 141 MODULE_PARM_DESC(downdelay, "Delay before considering link down, " 142 "in milliseconds"); 143 module_param(use_carrier, int, 0); 144 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; " 145 "0 for off, 1 for on (default)"); 146 module_param(mode, charp, 0); 147 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, " 148 "1 for active-backup, 2 for balance-xor, " 149 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, " 150 "6 for balance-alb"); 151 module_param(primary, charp, 0); 152 MODULE_PARM_DESC(primary, "Primary network device to use"); 153 module_param(primary_reselect, charp, 0); 154 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave " 155 "once it comes up; " 156 "0 for always (default), " 157 "1 for only if speed of primary is " 158 "better, " 159 "2 for only on active slave " 160 "failure"); 161 module_param(lacp_rate, charp, 0); 162 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; " 163 "0 for slow, 1 for fast"); 164 module_param(ad_select, charp, 0); 165 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; " 166 "0 for stable (default), 1 for bandwidth, " 167 "2 for count"); 168 module_param(min_links, int, 0); 169 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier"); 170 171 module_param(xmit_hash_policy, charp, 0); 172 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; " 173 "0 for layer 2 (default), 1 for layer 3+4, " 174 "2 for layer 2+3, 3 for encap layer 2+3, " 175 "4 for encap layer 3+4, 5 for vlan+srcmac"); 176 module_param(arp_interval, int, 0); 177 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds"); 178 module_param_array(arp_ip_target, charp, NULL, 0); 179 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form"); 180 module_param(arp_validate, charp, 0); 181 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; " 182 "0 for none (default), 1 for active, " 183 "2 for backup, 3 for all"); 184 module_param(arp_all_targets, charp, 0); 185 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all"); 186 module_param(fail_over_mac, charp, 0); 187 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to " 188 "the same MAC; 0 for none (default), " 189 "1 for active, 2 for follow"); 190 module_param(all_slaves_active, int, 0); 191 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface " 192 "by setting active flag for all slaves; " 193 "0 for never (default), 1 for always."); 194 module_param(resend_igmp, int, 0); 195 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on " 196 "link failure"); 197 module_param(packets_per_slave, int, 0); 198 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr " 199 "mode; 0 for a random slave, 1 packet per " 200 "slave (default), >1 packets per slave."); 201 module_param(lp_interval, uint, 0); 202 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where " 203 "the bonding driver sends learning packets to " 204 "each slaves peer switch. The default is 1."); 205 206 /*----------------------------- Global variables ----------------------------*/ 207 208 #ifdef CONFIG_NET_POLL_CONTROLLER 209 atomic_t netpoll_block_tx = ATOMIC_INIT(0); 210 #endif 211 212 unsigned int bond_net_id __read_mostly; 213 214 static const struct flow_dissector_key flow_keys_bonding_keys[] = { 215 { 216 .key_id = FLOW_DISSECTOR_KEY_CONTROL, 217 .offset = offsetof(struct flow_keys, control), 218 }, 219 { 220 .key_id = FLOW_DISSECTOR_KEY_BASIC, 221 .offset = offsetof(struct flow_keys, basic), 222 }, 223 { 224 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, 225 .offset = offsetof(struct flow_keys, addrs.v4addrs), 226 }, 227 { 228 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, 229 .offset = offsetof(struct flow_keys, addrs.v6addrs), 230 }, 231 { 232 .key_id = FLOW_DISSECTOR_KEY_TIPC, 233 .offset = offsetof(struct flow_keys, addrs.tipckey), 234 }, 235 { 236 .key_id = FLOW_DISSECTOR_KEY_PORTS, 237 .offset = offsetof(struct flow_keys, ports), 238 }, 239 { 240 .key_id = FLOW_DISSECTOR_KEY_ICMP, 241 .offset = offsetof(struct flow_keys, icmp), 242 }, 243 { 244 .key_id = FLOW_DISSECTOR_KEY_VLAN, 245 .offset = offsetof(struct flow_keys, vlan), 246 }, 247 { 248 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, 249 .offset = offsetof(struct flow_keys, tags), 250 }, 251 { 252 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, 253 .offset = offsetof(struct flow_keys, keyid), 254 }, 255 }; 256 257 static struct flow_dissector flow_keys_bonding __read_mostly; 258 259 /*-------------------------- Forward declarations ---------------------------*/ 260 261 static int bond_init(struct net_device *bond_dev); 262 static void bond_uninit(struct net_device *bond_dev); 263 static void bond_get_stats(struct net_device *bond_dev, 264 struct rtnl_link_stats64 *stats); 265 static void bond_slave_arr_handler(struct work_struct *work); 266 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 267 int mod); 268 static void bond_netdev_notify_work(struct work_struct *work); 269 270 /*---------------------------- General routines -----------------------------*/ 271 272 const char *bond_mode_name(int mode) 273 { 274 static const char *names[] = { 275 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)", 276 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)", 277 [BOND_MODE_XOR] = "load balancing (xor)", 278 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)", 279 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation", 280 [BOND_MODE_TLB] = "transmit load balancing", 281 [BOND_MODE_ALB] = "adaptive load balancing", 282 }; 283 284 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB) 285 return "unknown"; 286 287 return names[mode]; 288 } 289 290 /** 291 * bond_dev_queue_xmit - Prepare skb for xmit. 292 * 293 * @bond: bond device that got this skb for tx. 294 * @skb: hw accel VLAN tagged skb to transmit 295 * @slave_dev: slave that is supposed to xmit this skbuff 296 */ 297 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, 298 struct net_device *slave_dev) 299 { 300 skb->dev = slave_dev; 301 302 BUILD_BUG_ON(sizeof(skb->queue_mapping) != 303 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping)); 304 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping); 305 306 if (unlikely(netpoll_tx_running(bond->dev))) 307 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb); 308 309 return dev_queue_xmit(skb); 310 } 311 312 static bool bond_sk_check(struct bonding *bond) 313 { 314 switch (BOND_MODE(bond)) { 315 case BOND_MODE_8023AD: 316 case BOND_MODE_XOR: 317 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34) 318 return true; 319 fallthrough; 320 default: 321 return false; 322 } 323 } 324 325 static bool bond_xdp_check(struct bonding *bond) 326 { 327 switch (BOND_MODE(bond)) { 328 case BOND_MODE_ROUNDROBIN: 329 case BOND_MODE_ACTIVEBACKUP: 330 return true; 331 case BOND_MODE_8023AD: 332 case BOND_MODE_XOR: 333 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q 334 * payload is not in the packet due to hardware offload. 335 */ 336 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC) 337 return true; 338 fallthrough; 339 default: 340 return false; 341 } 342 } 343 344 /*---------------------------------- VLAN -----------------------------------*/ 345 346 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid, 347 * We don't protect the slave list iteration with a lock because: 348 * a. This operation is performed in IOCTL context, 349 * b. The operation is protected by the RTNL semaphore in the 8021q code, 350 * c. Holding a lock with BH disabled while directly calling a base driver 351 * entry point is generally a BAD idea. 352 * 353 * The design of synchronization/protection for this operation in the 8021q 354 * module is good for one or more VLAN devices over a single physical device 355 * and cannot be extended for a teaming solution like bonding, so there is a 356 * potential race condition here where a net device from the vlan group might 357 * be referenced (either by a base driver or the 8021q code) while it is being 358 * removed from the system. However, it turns out we're not making matters 359 * worse, and if it works for regular VLAN usage it will work here too. 360 */ 361 362 /** 363 * bond_vlan_rx_add_vid - Propagates adding an id to slaves 364 * @bond_dev: bonding net device that got called 365 * @proto: network protocol ID 366 * @vid: vlan id being added 367 */ 368 static int bond_vlan_rx_add_vid(struct net_device *bond_dev, 369 __be16 proto, u16 vid) 370 { 371 struct bonding *bond = netdev_priv(bond_dev); 372 struct slave *slave, *rollback_slave; 373 struct list_head *iter; 374 int res; 375 376 bond_for_each_slave(bond, slave, iter) { 377 res = vlan_vid_add(slave->dev, proto, vid); 378 if (res) 379 goto unwind; 380 } 381 382 return 0; 383 384 unwind: 385 /* unwind to the slave that failed */ 386 bond_for_each_slave(bond, rollback_slave, iter) { 387 if (rollback_slave == slave) 388 break; 389 390 vlan_vid_del(rollback_slave->dev, proto, vid); 391 } 392 393 return res; 394 } 395 396 /** 397 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves 398 * @bond_dev: bonding net device that got called 399 * @proto: network protocol ID 400 * @vid: vlan id being removed 401 */ 402 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, 403 __be16 proto, u16 vid) 404 { 405 struct bonding *bond = netdev_priv(bond_dev); 406 struct list_head *iter; 407 struct slave *slave; 408 409 bond_for_each_slave(bond, slave, iter) 410 vlan_vid_del(slave->dev, proto, vid); 411 412 if (bond_is_lb(bond)) 413 bond_alb_clear_vlan(bond, vid); 414 415 return 0; 416 } 417 418 /*---------------------------------- XFRM -----------------------------------*/ 419 420 #ifdef CONFIG_XFRM_OFFLOAD 421 /** 422 * bond_ipsec_add_sa - program device with a security association 423 * @xs: pointer to transformer state struct 424 * @extack: extack point to fill failure reason 425 **/ 426 static int bond_ipsec_add_sa(struct xfrm_state *xs, 427 struct netlink_ext_ack *extack) 428 { 429 struct net_device *bond_dev = xs->xso.dev; 430 struct net_device *real_dev; 431 netdevice_tracker tracker; 432 struct bond_ipsec *ipsec; 433 struct bonding *bond; 434 struct slave *slave; 435 int err; 436 437 if (!bond_dev) 438 return -EINVAL; 439 440 rcu_read_lock(); 441 bond = netdev_priv(bond_dev); 442 slave = rcu_dereference(bond->curr_active_slave); 443 real_dev = slave ? slave->dev : NULL; 444 netdev_hold(real_dev, &tracker, GFP_ATOMIC); 445 rcu_read_unlock(); 446 if (!real_dev) { 447 err = -ENODEV; 448 goto out; 449 } 450 451 if (!real_dev->xfrmdev_ops || 452 !real_dev->xfrmdev_ops->xdo_dev_state_add || 453 netif_is_bond_master(real_dev)) { 454 NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload"); 455 err = -EINVAL; 456 goto out; 457 } 458 459 ipsec = kmalloc(sizeof(*ipsec), GFP_KERNEL); 460 if (!ipsec) { 461 err = -ENOMEM; 462 goto out; 463 } 464 465 xs->xso.real_dev = real_dev; 466 err = real_dev->xfrmdev_ops->xdo_dev_state_add(xs, extack); 467 if (!err) { 468 ipsec->xs = xs; 469 INIT_LIST_HEAD(&ipsec->list); 470 mutex_lock(&bond->ipsec_lock); 471 list_add(&ipsec->list, &bond->ipsec_list); 472 mutex_unlock(&bond->ipsec_lock); 473 } else { 474 kfree(ipsec); 475 } 476 out: 477 netdev_put(real_dev, &tracker); 478 return err; 479 } 480 481 static void bond_ipsec_add_sa_all(struct bonding *bond) 482 { 483 struct net_device *bond_dev = bond->dev; 484 struct net_device *real_dev; 485 struct bond_ipsec *ipsec; 486 struct slave *slave; 487 488 slave = rtnl_dereference(bond->curr_active_slave); 489 real_dev = slave ? slave->dev : NULL; 490 if (!real_dev) 491 return; 492 493 mutex_lock(&bond->ipsec_lock); 494 if (!real_dev->xfrmdev_ops || 495 !real_dev->xfrmdev_ops->xdo_dev_state_add || 496 netif_is_bond_master(real_dev)) { 497 if (!list_empty(&bond->ipsec_list)) 498 slave_warn(bond_dev, real_dev, 499 "%s: no slave xdo_dev_state_add\n", 500 __func__); 501 goto out; 502 } 503 504 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 505 /* If new state is added before ipsec_lock acquired */ 506 if (ipsec->xs->xso.real_dev == real_dev) 507 continue; 508 509 ipsec->xs->xso.real_dev = real_dev; 510 if (real_dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) { 511 slave_warn(bond_dev, real_dev, "%s: failed to add SA\n", __func__); 512 ipsec->xs->xso.real_dev = NULL; 513 } 514 } 515 out: 516 mutex_unlock(&bond->ipsec_lock); 517 } 518 519 /** 520 * bond_ipsec_del_sa - clear out this specific SA 521 * @xs: pointer to transformer state struct 522 **/ 523 static void bond_ipsec_del_sa(struct xfrm_state *xs) 524 { 525 struct net_device *bond_dev = xs->xso.dev; 526 struct net_device *real_dev; 527 netdevice_tracker tracker; 528 struct bond_ipsec *ipsec; 529 struct bonding *bond; 530 struct slave *slave; 531 532 if (!bond_dev) 533 return; 534 535 rcu_read_lock(); 536 bond = netdev_priv(bond_dev); 537 slave = rcu_dereference(bond->curr_active_slave); 538 real_dev = slave ? slave->dev : NULL; 539 netdev_hold(real_dev, &tracker, GFP_ATOMIC); 540 rcu_read_unlock(); 541 542 if (!slave) 543 goto out; 544 545 if (!xs->xso.real_dev) 546 goto out; 547 548 WARN_ON(xs->xso.real_dev != real_dev); 549 550 if (!real_dev->xfrmdev_ops || 551 !real_dev->xfrmdev_ops->xdo_dev_state_delete || 552 netif_is_bond_master(real_dev)) { 553 slave_warn(bond_dev, real_dev, "%s: no slave xdo_dev_state_delete\n", __func__); 554 goto out; 555 } 556 557 real_dev->xfrmdev_ops->xdo_dev_state_delete(xs); 558 out: 559 netdev_put(real_dev, &tracker); 560 mutex_lock(&bond->ipsec_lock); 561 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 562 if (ipsec->xs == xs) { 563 list_del(&ipsec->list); 564 kfree(ipsec); 565 break; 566 } 567 } 568 mutex_unlock(&bond->ipsec_lock); 569 } 570 571 static void bond_ipsec_del_sa_all(struct bonding *bond) 572 { 573 struct net_device *bond_dev = bond->dev; 574 struct net_device *real_dev; 575 struct bond_ipsec *ipsec; 576 struct slave *slave; 577 578 slave = rtnl_dereference(bond->curr_active_slave); 579 real_dev = slave ? slave->dev : NULL; 580 if (!real_dev) 581 return; 582 583 mutex_lock(&bond->ipsec_lock); 584 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 585 if (!ipsec->xs->xso.real_dev) 586 continue; 587 588 if (!real_dev->xfrmdev_ops || 589 !real_dev->xfrmdev_ops->xdo_dev_state_delete || 590 netif_is_bond_master(real_dev)) { 591 slave_warn(bond_dev, real_dev, 592 "%s: no slave xdo_dev_state_delete\n", 593 __func__); 594 } else { 595 real_dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 596 if (real_dev->xfrmdev_ops->xdo_dev_state_free) 597 real_dev->xfrmdev_ops->xdo_dev_state_free(ipsec->xs); 598 } 599 } 600 mutex_unlock(&bond->ipsec_lock); 601 } 602 603 static void bond_ipsec_free_sa(struct xfrm_state *xs) 604 { 605 struct net_device *bond_dev = xs->xso.dev; 606 struct net_device *real_dev; 607 netdevice_tracker tracker; 608 struct bonding *bond; 609 struct slave *slave; 610 611 if (!bond_dev) 612 return; 613 614 rcu_read_lock(); 615 bond = netdev_priv(bond_dev); 616 slave = rcu_dereference(bond->curr_active_slave); 617 real_dev = slave ? slave->dev : NULL; 618 netdev_hold(real_dev, &tracker, GFP_ATOMIC); 619 rcu_read_unlock(); 620 621 if (!slave) 622 goto out; 623 624 if (!xs->xso.real_dev) 625 goto out; 626 627 WARN_ON(xs->xso.real_dev != real_dev); 628 629 if (real_dev && real_dev->xfrmdev_ops && 630 real_dev->xfrmdev_ops->xdo_dev_state_free) 631 real_dev->xfrmdev_ops->xdo_dev_state_free(xs); 632 out: 633 netdev_put(real_dev, &tracker); 634 } 635 636 /** 637 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 638 * @skb: current data packet 639 * @xs: pointer to transformer state struct 640 **/ 641 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 642 { 643 struct net_device *bond_dev = xs->xso.dev; 644 struct net_device *real_dev; 645 struct slave *curr_active; 646 struct bonding *bond; 647 bool ok = false; 648 649 bond = netdev_priv(bond_dev); 650 rcu_read_lock(); 651 curr_active = rcu_dereference(bond->curr_active_slave); 652 if (!curr_active) 653 goto out; 654 real_dev = curr_active->dev; 655 656 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) 657 goto out; 658 659 if (!xs->xso.real_dev) 660 goto out; 661 662 if (!real_dev->xfrmdev_ops || 663 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 664 netif_is_bond_master(real_dev)) 665 goto out; 666 667 ok = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 668 out: 669 rcu_read_unlock(); 670 return ok; 671 } 672 673 static const struct xfrmdev_ops bond_xfrmdev_ops = { 674 .xdo_dev_state_add = bond_ipsec_add_sa, 675 .xdo_dev_state_delete = bond_ipsec_del_sa, 676 .xdo_dev_state_free = bond_ipsec_free_sa, 677 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 678 }; 679 #endif /* CONFIG_XFRM_OFFLOAD */ 680 681 /*------------------------------- Link status -------------------------------*/ 682 683 /* Set the carrier state for the master according to the state of its 684 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 685 * do special 802.3ad magic. 686 * 687 * Returns zero if carrier state does not change, nonzero if it does. 688 */ 689 int bond_set_carrier(struct bonding *bond) 690 { 691 struct list_head *iter; 692 struct slave *slave; 693 694 if (!bond_has_slaves(bond)) 695 goto down; 696 697 if (BOND_MODE(bond) == BOND_MODE_8023AD) 698 return bond_3ad_set_carrier(bond); 699 700 bond_for_each_slave(bond, slave, iter) { 701 if (slave->link == BOND_LINK_UP) { 702 if (!netif_carrier_ok(bond->dev)) { 703 netif_carrier_on(bond->dev); 704 return 1; 705 } 706 return 0; 707 } 708 } 709 710 down: 711 if (netif_carrier_ok(bond->dev)) { 712 netif_carrier_off(bond->dev); 713 return 1; 714 } 715 return 0; 716 } 717 718 /* Get link speed and duplex from the slave's base driver 719 * using ethtool. If for some reason the call fails or the 720 * values are invalid, set speed and duplex to -1, 721 * and return. Return 1 if speed or duplex settings are 722 * UNKNOWN; 0 otherwise. 723 */ 724 static int bond_update_speed_duplex(struct slave *slave) 725 { 726 struct net_device *slave_dev = slave->dev; 727 struct ethtool_link_ksettings ecmd; 728 int res; 729 730 slave->speed = SPEED_UNKNOWN; 731 slave->duplex = DUPLEX_UNKNOWN; 732 733 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 734 if (res < 0) 735 return 1; 736 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 737 return 1; 738 switch (ecmd.base.duplex) { 739 case DUPLEX_FULL: 740 case DUPLEX_HALF: 741 break; 742 default: 743 return 1; 744 } 745 746 slave->speed = ecmd.base.speed; 747 slave->duplex = ecmd.base.duplex; 748 749 return 0; 750 } 751 752 const char *bond_slave_link_status(s8 link) 753 { 754 switch (link) { 755 case BOND_LINK_UP: 756 return "up"; 757 case BOND_LINK_FAIL: 758 return "going down"; 759 case BOND_LINK_DOWN: 760 return "down"; 761 case BOND_LINK_BACK: 762 return "going back"; 763 default: 764 return "unknown"; 765 } 766 } 767 768 /* if <dev> supports MII link status reporting, check its link status. 769 * 770 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 771 * depending upon the setting of the use_carrier parameter. 772 * 773 * Return either BMSR_LSTATUS, meaning that the link is up (or we 774 * can't tell and just pretend it is), or 0, meaning that the link is 775 * down. 776 * 777 * If reporting is non-zero, instead of faking link up, return -1 if 778 * both ETHTOOL and MII ioctls fail (meaning the device does not 779 * support them). If use_carrier is set, return whatever it says. 780 * It'd be nice if there was a good way to tell if a driver supports 781 * netif_carrier, but there really isn't. 782 */ 783 static int bond_check_dev_link(struct bonding *bond, 784 struct net_device *slave_dev, int reporting) 785 { 786 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 787 int (*ioctl)(struct net_device *, struct ifreq *, int); 788 struct ifreq ifr; 789 struct mii_ioctl_data *mii; 790 791 if (!reporting && !netif_running(slave_dev)) 792 return 0; 793 794 if (bond->params.use_carrier) 795 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 796 797 /* Try to get link status using Ethtool first. */ 798 if (slave_dev->ethtool_ops->get_link) 799 return slave_dev->ethtool_ops->get_link(slave_dev) ? 800 BMSR_LSTATUS : 0; 801 802 /* Ethtool can't be used, fallback to MII ioctls. */ 803 ioctl = slave_ops->ndo_eth_ioctl; 804 if (ioctl) { 805 /* TODO: set pointer to correct ioctl on a per team member 806 * bases to make this more efficient. that is, once 807 * we determine the correct ioctl, we will always 808 * call it and not the others for that team 809 * member. 810 */ 811 812 /* We cannot assume that SIOCGMIIPHY will also read a 813 * register; not all network drivers (e.g., e100) 814 * support that. 815 */ 816 817 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 818 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 819 mii = if_mii(&ifr); 820 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 821 mii->reg_num = MII_BMSR; 822 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 823 return mii->val_out & BMSR_LSTATUS; 824 } 825 } 826 827 /* If reporting, report that either there's no ndo_eth_ioctl, 828 * or both SIOCGMIIREG and get_link failed (meaning that we 829 * cannot report link status). If not reporting, pretend 830 * we're ok. 831 */ 832 return reporting ? -1 : BMSR_LSTATUS; 833 } 834 835 /*----------------------------- Multicast list ------------------------------*/ 836 837 /* Push the promiscuity flag down to appropriate slaves */ 838 static int bond_set_promiscuity(struct bonding *bond, int inc) 839 { 840 struct list_head *iter; 841 int err = 0; 842 843 if (bond_uses_primary(bond)) { 844 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 845 846 if (curr_active) 847 err = dev_set_promiscuity(curr_active->dev, inc); 848 } else { 849 struct slave *slave; 850 851 bond_for_each_slave(bond, slave, iter) { 852 err = dev_set_promiscuity(slave->dev, inc); 853 if (err) 854 return err; 855 } 856 } 857 return err; 858 } 859 860 /* Push the allmulti flag down to all slaves */ 861 static int bond_set_allmulti(struct bonding *bond, int inc) 862 { 863 struct list_head *iter; 864 int err = 0; 865 866 if (bond_uses_primary(bond)) { 867 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 868 869 if (curr_active) 870 err = dev_set_allmulti(curr_active->dev, inc); 871 } else { 872 struct slave *slave; 873 874 bond_for_each_slave(bond, slave, iter) { 875 err = dev_set_allmulti(slave->dev, inc); 876 if (err) 877 return err; 878 } 879 } 880 return err; 881 } 882 883 /* Retrieve the list of registered multicast addresses for the bonding 884 * device and retransmit an IGMP JOIN request to the current active 885 * slave. 886 */ 887 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 888 { 889 struct bonding *bond = container_of(work, struct bonding, 890 mcast_work.work); 891 892 if (!rtnl_trylock()) { 893 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 894 return; 895 } 896 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 897 898 if (bond->igmp_retrans > 1) { 899 bond->igmp_retrans--; 900 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 901 } 902 rtnl_unlock(); 903 } 904 905 /* Flush bond's hardware addresses from slave */ 906 static void bond_hw_addr_flush(struct net_device *bond_dev, 907 struct net_device *slave_dev) 908 { 909 struct bonding *bond = netdev_priv(bond_dev); 910 911 dev_uc_unsync(slave_dev, bond_dev); 912 dev_mc_unsync(slave_dev, bond_dev); 913 914 if (BOND_MODE(bond) == BOND_MODE_8023AD) 915 dev_mc_del(slave_dev, lacpdu_mcast_addr); 916 } 917 918 /*--------------------------- Active slave change ---------------------------*/ 919 920 /* Update the hardware address list and promisc/allmulti for the new and 921 * old active slaves (if any). Modes that are not using primary keep all 922 * slaves up date at all times; only the modes that use primary need to call 923 * this function to swap these settings during a failover. 924 */ 925 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 926 struct slave *old_active) 927 { 928 if (old_active) { 929 if (bond->dev->flags & IFF_PROMISC) 930 dev_set_promiscuity(old_active->dev, -1); 931 932 if (bond->dev->flags & IFF_ALLMULTI) 933 dev_set_allmulti(old_active->dev, -1); 934 935 if (bond->dev->flags & IFF_UP) 936 bond_hw_addr_flush(bond->dev, old_active->dev); 937 } 938 939 if (new_active) { 940 /* FIXME: Signal errors upstream. */ 941 if (bond->dev->flags & IFF_PROMISC) 942 dev_set_promiscuity(new_active->dev, 1); 943 944 if (bond->dev->flags & IFF_ALLMULTI) 945 dev_set_allmulti(new_active->dev, 1); 946 947 if (bond->dev->flags & IFF_UP) { 948 netif_addr_lock_bh(bond->dev); 949 dev_uc_sync(new_active->dev, bond->dev); 950 dev_mc_sync(new_active->dev, bond->dev); 951 netif_addr_unlock_bh(bond->dev); 952 } 953 } 954 } 955 956 /** 957 * bond_set_dev_addr - clone slave's address to bond 958 * @bond_dev: bond net device 959 * @slave_dev: slave net device 960 * 961 * Should be called with RTNL held. 962 */ 963 static int bond_set_dev_addr(struct net_device *bond_dev, 964 struct net_device *slave_dev) 965 { 966 int err; 967 968 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 969 bond_dev, slave_dev, slave_dev->addr_len); 970 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 971 if (err) 972 return err; 973 974 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 975 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 976 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 977 return 0; 978 } 979 980 static struct slave *bond_get_old_active(struct bonding *bond, 981 struct slave *new_active) 982 { 983 struct slave *slave; 984 struct list_head *iter; 985 986 bond_for_each_slave(bond, slave, iter) { 987 if (slave == new_active) 988 continue; 989 990 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 991 return slave; 992 } 993 994 return NULL; 995 } 996 997 /* bond_do_fail_over_mac 998 * 999 * Perform special MAC address swapping for fail_over_mac settings 1000 * 1001 * Called with RTNL 1002 */ 1003 static void bond_do_fail_over_mac(struct bonding *bond, 1004 struct slave *new_active, 1005 struct slave *old_active) 1006 { 1007 u8 tmp_mac[MAX_ADDR_LEN]; 1008 struct sockaddr_storage ss; 1009 int rv; 1010 1011 switch (bond->params.fail_over_mac) { 1012 case BOND_FOM_ACTIVE: 1013 if (new_active) { 1014 rv = bond_set_dev_addr(bond->dev, new_active->dev); 1015 if (rv) 1016 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 1017 -rv); 1018 } 1019 break; 1020 case BOND_FOM_FOLLOW: 1021 /* if new_active && old_active, swap them 1022 * if just old_active, do nothing (going to no active slave) 1023 * if just new_active, set new_active to bond's MAC 1024 */ 1025 if (!new_active) 1026 return; 1027 1028 if (!old_active) 1029 old_active = bond_get_old_active(bond, new_active); 1030 1031 if (old_active) { 1032 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 1033 new_active->dev->addr_len); 1034 bond_hw_addr_copy(ss.__data, 1035 old_active->dev->dev_addr, 1036 old_active->dev->addr_len); 1037 ss.ss_family = new_active->dev->type; 1038 } else { 1039 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 1040 bond->dev->addr_len); 1041 ss.ss_family = bond->dev->type; 1042 } 1043 1044 rv = dev_set_mac_address(new_active->dev, 1045 (struct sockaddr *)&ss, NULL); 1046 if (rv) { 1047 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1048 -rv); 1049 goto out; 1050 } 1051 1052 if (!old_active) 1053 goto out; 1054 1055 bond_hw_addr_copy(ss.__data, tmp_mac, 1056 new_active->dev->addr_len); 1057 ss.ss_family = old_active->dev->type; 1058 1059 rv = dev_set_mac_address(old_active->dev, 1060 (struct sockaddr *)&ss, NULL); 1061 if (rv) 1062 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1063 -rv); 1064 out: 1065 break; 1066 default: 1067 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1068 bond->params.fail_over_mac); 1069 break; 1070 } 1071 1072 } 1073 1074 /** 1075 * bond_choose_primary_or_current - select the primary or high priority slave 1076 * @bond: our bonding struct 1077 * 1078 * - Check if there is a primary link. If the primary link was set and is up, 1079 * go on and do link reselection. 1080 * 1081 * - If primary link is not set or down, find the highest priority link. 1082 * If the highest priority link is not current slave, set it as primary 1083 * link and do link reselection. 1084 */ 1085 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1086 { 1087 struct slave *prim = rtnl_dereference(bond->primary_slave); 1088 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1089 struct slave *slave, *hprio = NULL; 1090 struct list_head *iter; 1091 1092 if (!prim || prim->link != BOND_LINK_UP) { 1093 bond_for_each_slave(bond, slave, iter) { 1094 if (slave->link == BOND_LINK_UP) { 1095 hprio = hprio ?: slave; 1096 if (slave->prio > hprio->prio) 1097 hprio = slave; 1098 } 1099 } 1100 1101 if (hprio && hprio != curr) { 1102 prim = hprio; 1103 goto link_reselect; 1104 } 1105 1106 if (!curr || curr->link != BOND_LINK_UP) 1107 return NULL; 1108 return curr; 1109 } 1110 1111 if (bond->force_primary) { 1112 bond->force_primary = false; 1113 return prim; 1114 } 1115 1116 link_reselect: 1117 if (!curr || curr->link != BOND_LINK_UP) 1118 return prim; 1119 1120 /* At this point, prim and curr are both up */ 1121 switch (bond->params.primary_reselect) { 1122 case BOND_PRI_RESELECT_ALWAYS: 1123 return prim; 1124 case BOND_PRI_RESELECT_BETTER: 1125 if (prim->speed < curr->speed) 1126 return curr; 1127 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1128 return curr; 1129 return prim; 1130 case BOND_PRI_RESELECT_FAILURE: 1131 return curr; 1132 default: 1133 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1134 bond->params.primary_reselect); 1135 return curr; 1136 } 1137 } 1138 1139 /** 1140 * bond_find_best_slave - select the best available slave to be the active one 1141 * @bond: our bonding struct 1142 */ 1143 static struct slave *bond_find_best_slave(struct bonding *bond) 1144 { 1145 struct slave *slave, *bestslave = NULL; 1146 struct list_head *iter; 1147 int mintime = bond->params.updelay; 1148 1149 slave = bond_choose_primary_or_current(bond); 1150 if (slave) 1151 return slave; 1152 1153 bond_for_each_slave(bond, slave, iter) { 1154 if (slave->link == BOND_LINK_UP) 1155 return slave; 1156 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1157 slave->delay < mintime) { 1158 mintime = slave->delay; 1159 bestslave = slave; 1160 } 1161 } 1162 1163 return bestslave; 1164 } 1165 1166 /* must be called in RCU critical section or with RTNL held */ 1167 static bool bond_should_notify_peers(struct bonding *bond) 1168 { 1169 struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave); 1170 1171 if (!slave || !bond->send_peer_notif || 1172 bond->send_peer_notif % 1173 max(1, bond->params.peer_notif_delay) != 0 || 1174 !netif_carrier_ok(bond->dev) || 1175 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1176 return false; 1177 1178 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1179 slave ? slave->dev->name : "NULL"); 1180 1181 return true; 1182 } 1183 1184 /** 1185 * bond_change_active_slave - change the active slave into the specified one 1186 * @bond: our bonding struct 1187 * @new_active: the new slave to make the active one 1188 * 1189 * Set the new slave to the bond's settings and unset them on the old 1190 * curr_active_slave. 1191 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1192 * 1193 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1194 * because it is apparently the best available slave we have, even though its 1195 * updelay hasn't timed out yet. 1196 * 1197 * Caller must hold RTNL. 1198 */ 1199 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1200 { 1201 struct slave *old_active; 1202 1203 ASSERT_RTNL(); 1204 1205 old_active = rtnl_dereference(bond->curr_active_slave); 1206 1207 if (old_active == new_active) 1208 return; 1209 1210 #ifdef CONFIG_XFRM_OFFLOAD 1211 bond_ipsec_del_sa_all(bond); 1212 #endif /* CONFIG_XFRM_OFFLOAD */ 1213 1214 if (new_active) { 1215 new_active->last_link_up = jiffies; 1216 1217 if (new_active->link == BOND_LINK_BACK) { 1218 if (bond_uses_primary(bond)) { 1219 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1220 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1221 } 1222 1223 new_active->delay = 0; 1224 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1225 BOND_SLAVE_NOTIFY_NOW); 1226 1227 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1228 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1229 1230 if (bond_is_lb(bond)) 1231 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1232 } else { 1233 if (bond_uses_primary(bond)) 1234 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1235 } 1236 } 1237 1238 if (bond_uses_primary(bond)) 1239 bond_hw_addr_swap(bond, new_active, old_active); 1240 1241 if (bond_is_lb(bond)) { 1242 bond_alb_handle_active_change(bond, new_active); 1243 if (old_active) 1244 bond_set_slave_inactive_flags(old_active, 1245 BOND_SLAVE_NOTIFY_NOW); 1246 if (new_active) 1247 bond_set_slave_active_flags(new_active, 1248 BOND_SLAVE_NOTIFY_NOW); 1249 } else { 1250 rcu_assign_pointer(bond->curr_active_slave, new_active); 1251 } 1252 1253 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1254 if (old_active) 1255 bond_set_slave_inactive_flags(old_active, 1256 BOND_SLAVE_NOTIFY_NOW); 1257 1258 if (new_active) { 1259 bool should_notify_peers = false; 1260 1261 bond_set_slave_active_flags(new_active, 1262 BOND_SLAVE_NOTIFY_NOW); 1263 1264 if (bond->params.fail_over_mac) 1265 bond_do_fail_over_mac(bond, new_active, 1266 old_active); 1267 1268 if (netif_running(bond->dev)) { 1269 bond->send_peer_notif = 1270 bond->params.num_peer_notif * 1271 max(1, bond->params.peer_notif_delay); 1272 should_notify_peers = 1273 bond_should_notify_peers(bond); 1274 } 1275 1276 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1277 if (should_notify_peers) { 1278 bond->send_peer_notif--; 1279 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1280 bond->dev); 1281 } 1282 } 1283 } 1284 1285 #ifdef CONFIG_XFRM_OFFLOAD 1286 bond_ipsec_add_sa_all(bond); 1287 #endif /* CONFIG_XFRM_OFFLOAD */ 1288 1289 /* resend IGMP joins since active slave has changed or 1290 * all were sent on curr_active_slave. 1291 * resend only if bond is brought up with the affected 1292 * bonding modes and the retransmission is enabled 1293 */ 1294 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1295 ((bond_uses_primary(bond) && new_active) || 1296 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1297 bond->igmp_retrans = bond->params.resend_igmp; 1298 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1299 } 1300 } 1301 1302 /** 1303 * bond_select_active_slave - select a new active slave, if needed 1304 * @bond: our bonding struct 1305 * 1306 * This functions should be called when one of the following occurs: 1307 * - The old curr_active_slave has been released or lost its link. 1308 * - The primary_slave has got its link back. 1309 * - A slave has got its link back and there's no old curr_active_slave. 1310 * 1311 * Caller must hold RTNL. 1312 */ 1313 void bond_select_active_slave(struct bonding *bond) 1314 { 1315 struct slave *best_slave; 1316 int rv; 1317 1318 ASSERT_RTNL(); 1319 1320 best_slave = bond_find_best_slave(bond); 1321 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1322 bond_change_active_slave(bond, best_slave); 1323 rv = bond_set_carrier(bond); 1324 if (!rv) 1325 return; 1326 1327 if (netif_carrier_ok(bond->dev)) 1328 netdev_info(bond->dev, "active interface up!\n"); 1329 else 1330 netdev_info(bond->dev, "now running without any active interface!\n"); 1331 } 1332 } 1333 1334 #ifdef CONFIG_NET_POLL_CONTROLLER 1335 static inline int slave_enable_netpoll(struct slave *slave) 1336 { 1337 struct netpoll *np; 1338 int err = 0; 1339 1340 np = kzalloc(sizeof(*np), GFP_KERNEL); 1341 err = -ENOMEM; 1342 if (!np) 1343 goto out; 1344 1345 err = __netpoll_setup(np, slave->dev); 1346 if (err) { 1347 kfree(np); 1348 goto out; 1349 } 1350 slave->np = np; 1351 out: 1352 return err; 1353 } 1354 static inline void slave_disable_netpoll(struct slave *slave) 1355 { 1356 struct netpoll *np = slave->np; 1357 1358 if (!np) 1359 return; 1360 1361 slave->np = NULL; 1362 1363 __netpoll_free(np); 1364 } 1365 1366 static void bond_poll_controller(struct net_device *bond_dev) 1367 { 1368 struct bonding *bond = netdev_priv(bond_dev); 1369 struct slave *slave = NULL; 1370 struct list_head *iter; 1371 struct ad_info ad_info; 1372 1373 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1374 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1375 return; 1376 1377 bond_for_each_slave_rcu(bond, slave, iter) { 1378 if (!bond_slave_is_up(slave)) 1379 continue; 1380 1381 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1382 struct aggregator *agg = 1383 SLAVE_AD_INFO(slave)->port.aggregator; 1384 1385 if (agg && 1386 agg->aggregator_identifier != ad_info.aggregator_id) 1387 continue; 1388 } 1389 1390 netpoll_poll_dev(slave->dev); 1391 } 1392 } 1393 1394 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1395 { 1396 struct bonding *bond = netdev_priv(bond_dev); 1397 struct list_head *iter; 1398 struct slave *slave; 1399 1400 bond_for_each_slave(bond, slave, iter) 1401 if (bond_slave_is_up(slave)) 1402 slave_disable_netpoll(slave); 1403 } 1404 1405 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni) 1406 { 1407 struct bonding *bond = netdev_priv(dev); 1408 struct list_head *iter; 1409 struct slave *slave; 1410 int err = 0; 1411 1412 bond_for_each_slave(bond, slave, iter) { 1413 err = slave_enable_netpoll(slave); 1414 if (err) { 1415 bond_netpoll_cleanup(dev); 1416 break; 1417 } 1418 } 1419 return err; 1420 } 1421 #else 1422 static inline int slave_enable_netpoll(struct slave *slave) 1423 { 1424 return 0; 1425 } 1426 static inline void slave_disable_netpoll(struct slave *slave) 1427 { 1428 } 1429 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1430 { 1431 } 1432 #endif 1433 1434 /*---------------------------------- IOCTL ----------------------------------*/ 1435 1436 static netdev_features_t bond_fix_features(struct net_device *dev, 1437 netdev_features_t features) 1438 { 1439 struct bonding *bond = netdev_priv(dev); 1440 struct list_head *iter; 1441 netdev_features_t mask; 1442 struct slave *slave; 1443 1444 mask = features; 1445 1446 features &= ~NETIF_F_ONE_FOR_ALL; 1447 features |= NETIF_F_ALL_FOR_ALL; 1448 1449 bond_for_each_slave(bond, slave, iter) { 1450 features = netdev_increment_features(features, 1451 slave->dev->features, 1452 mask); 1453 } 1454 features = netdev_add_tso_features(features, mask); 1455 1456 return features; 1457 } 1458 1459 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1460 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1461 NETIF_F_HIGHDMA | NETIF_F_LRO) 1462 1463 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1464 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1465 1466 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1467 NETIF_F_GSO_SOFTWARE) 1468 1469 1470 static void bond_compute_features(struct bonding *bond) 1471 { 1472 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1473 IFF_XMIT_DST_RELEASE_PERM; 1474 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1475 netdev_features_t enc_features = BOND_ENC_FEATURES; 1476 #ifdef CONFIG_XFRM_OFFLOAD 1477 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1478 #endif /* CONFIG_XFRM_OFFLOAD */ 1479 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1480 struct net_device *bond_dev = bond->dev; 1481 struct list_head *iter; 1482 struct slave *slave; 1483 unsigned short max_hard_header_len = ETH_HLEN; 1484 unsigned int tso_max_size = TSO_MAX_SIZE; 1485 u16 tso_max_segs = TSO_MAX_SEGS; 1486 1487 if (!bond_has_slaves(bond)) 1488 goto done; 1489 vlan_features &= NETIF_F_ALL_FOR_ALL; 1490 mpls_features &= NETIF_F_ALL_FOR_ALL; 1491 1492 bond_for_each_slave(bond, slave, iter) { 1493 vlan_features = netdev_increment_features(vlan_features, 1494 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1495 1496 enc_features = netdev_increment_features(enc_features, 1497 slave->dev->hw_enc_features, 1498 BOND_ENC_FEATURES); 1499 1500 #ifdef CONFIG_XFRM_OFFLOAD 1501 xfrm_features = netdev_increment_features(xfrm_features, 1502 slave->dev->hw_enc_features, 1503 BOND_XFRM_FEATURES); 1504 #endif /* CONFIG_XFRM_OFFLOAD */ 1505 1506 mpls_features = netdev_increment_features(mpls_features, 1507 slave->dev->mpls_features, 1508 BOND_MPLS_FEATURES); 1509 1510 dst_release_flag &= slave->dev->priv_flags; 1511 if (slave->dev->hard_header_len > max_hard_header_len) 1512 max_hard_header_len = slave->dev->hard_header_len; 1513 1514 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1515 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1516 } 1517 bond_dev->hard_header_len = max_hard_header_len; 1518 1519 done: 1520 bond_dev->vlan_features = vlan_features; 1521 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1522 NETIF_F_HW_VLAN_CTAG_TX | 1523 NETIF_F_HW_VLAN_STAG_TX; 1524 #ifdef CONFIG_XFRM_OFFLOAD 1525 bond_dev->hw_enc_features |= xfrm_features; 1526 #endif /* CONFIG_XFRM_OFFLOAD */ 1527 bond_dev->mpls_features = mpls_features; 1528 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1529 netif_set_tso_max_size(bond_dev, tso_max_size); 1530 1531 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1532 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1533 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1534 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1535 1536 netdev_change_features(bond_dev); 1537 } 1538 1539 static void bond_setup_by_slave(struct net_device *bond_dev, 1540 struct net_device *slave_dev) 1541 { 1542 bool was_up = !!(bond_dev->flags & IFF_UP); 1543 1544 dev_close(bond_dev); 1545 1546 bond_dev->header_ops = slave_dev->header_ops; 1547 1548 bond_dev->type = slave_dev->type; 1549 bond_dev->hard_header_len = slave_dev->hard_header_len; 1550 bond_dev->needed_headroom = slave_dev->needed_headroom; 1551 bond_dev->addr_len = slave_dev->addr_len; 1552 1553 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1554 slave_dev->addr_len); 1555 1556 if (slave_dev->flags & IFF_POINTOPOINT) { 1557 bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST); 1558 bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP); 1559 } 1560 if (was_up) 1561 dev_open(bond_dev, NULL); 1562 } 1563 1564 /* On bonding slaves other than the currently active slave, suppress 1565 * duplicates except for alb non-mcast/bcast. 1566 */ 1567 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1568 struct slave *slave, 1569 struct bonding *bond) 1570 { 1571 if (bond_is_slave_inactive(slave)) { 1572 if (BOND_MODE(bond) == BOND_MODE_ALB && 1573 skb->pkt_type != PACKET_BROADCAST && 1574 skb->pkt_type != PACKET_MULTICAST) 1575 return false; 1576 return true; 1577 } 1578 return false; 1579 } 1580 1581 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1582 { 1583 struct sk_buff *skb = *pskb; 1584 struct slave *slave; 1585 struct bonding *bond; 1586 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1587 struct slave *); 1588 int ret = RX_HANDLER_ANOTHER; 1589 1590 skb = skb_share_check(skb, GFP_ATOMIC); 1591 if (unlikely(!skb)) 1592 return RX_HANDLER_CONSUMED; 1593 1594 *pskb = skb; 1595 1596 slave = bond_slave_get_rcu(skb->dev); 1597 bond = slave->bond; 1598 1599 recv_probe = READ_ONCE(bond->recv_probe); 1600 if (recv_probe) { 1601 ret = recv_probe(skb, bond, slave); 1602 if (ret == RX_HANDLER_CONSUMED) { 1603 consume_skb(skb); 1604 return ret; 1605 } 1606 } 1607 1608 /* 1609 * For packets determined by bond_should_deliver_exact_match() call to 1610 * be suppressed we want to make an exception for link-local packets. 1611 * This is necessary for e.g. LLDP daemons to be able to monitor 1612 * inactive slave links without being forced to bind to them 1613 * explicitly. 1614 * 1615 * At the same time, packets that are passed to the bonding master 1616 * (including link-local ones) can have their originating interface 1617 * determined via PACKET_ORIGDEV socket option. 1618 */ 1619 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1620 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1621 return RX_HANDLER_PASS; 1622 return RX_HANDLER_EXACT; 1623 } 1624 1625 skb->dev = bond->dev; 1626 1627 if (BOND_MODE(bond) == BOND_MODE_ALB && 1628 netif_is_bridge_port(bond->dev) && 1629 skb->pkt_type == PACKET_HOST) { 1630 1631 if (unlikely(skb_cow_head(skb, 1632 skb->data - skb_mac_header(skb)))) { 1633 kfree_skb(skb); 1634 return RX_HANDLER_CONSUMED; 1635 } 1636 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1637 bond->dev->addr_len); 1638 } 1639 1640 return ret; 1641 } 1642 1643 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1644 { 1645 switch (BOND_MODE(bond)) { 1646 case BOND_MODE_ROUNDROBIN: 1647 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1648 case BOND_MODE_ACTIVEBACKUP: 1649 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1650 case BOND_MODE_BROADCAST: 1651 return NETDEV_LAG_TX_TYPE_BROADCAST; 1652 case BOND_MODE_XOR: 1653 case BOND_MODE_8023AD: 1654 return NETDEV_LAG_TX_TYPE_HASH; 1655 default: 1656 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1657 } 1658 } 1659 1660 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1661 enum netdev_lag_tx_type type) 1662 { 1663 if (type != NETDEV_LAG_TX_TYPE_HASH) 1664 return NETDEV_LAG_HASH_NONE; 1665 1666 switch (bond->params.xmit_policy) { 1667 case BOND_XMIT_POLICY_LAYER2: 1668 return NETDEV_LAG_HASH_L2; 1669 case BOND_XMIT_POLICY_LAYER34: 1670 return NETDEV_LAG_HASH_L34; 1671 case BOND_XMIT_POLICY_LAYER23: 1672 return NETDEV_LAG_HASH_L23; 1673 case BOND_XMIT_POLICY_ENCAP23: 1674 return NETDEV_LAG_HASH_E23; 1675 case BOND_XMIT_POLICY_ENCAP34: 1676 return NETDEV_LAG_HASH_E34; 1677 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1678 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1679 default: 1680 return NETDEV_LAG_HASH_UNKNOWN; 1681 } 1682 } 1683 1684 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1685 struct netlink_ext_ack *extack) 1686 { 1687 struct netdev_lag_upper_info lag_upper_info; 1688 enum netdev_lag_tx_type type; 1689 int err; 1690 1691 type = bond_lag_tx_type(bond); 1692 lag_upper_info.tx_type = type; 1693 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1694 1695 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1696 &lag_upper_info, extack); 1697 if (err) 1698 return err; 1699 1700 slave->dev->flags |= IFF_SLAVE; 1701 return 0; 1702 } 1703 1704 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1705 { 1706 netdev_upper_dev_unlink(slave->dev, bond->dev); 1707 slave->dev->flags &= ~IFF_SLAVE; 1708 } 1709 1710 static void slave_kobj_release(struct kobject *kobj) 1711 { 1712 struct slave *slave = to_slave(kobj); 1713 struct bonding *bond = bond_get_bond_by_slave(slave); 1714 1715 cancel_delayed_work_sync(&slave->notify_work); 1716 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1717 kfree(SLAVE_AD_INFO(slave)); 1718 1719 kfree(slave); 1720 } 1721 1722 static struct kobj_type slave_ktype = { 1723 .release = slave_kobj_release, 1724 #ifdef CONFIG_SYSFS 1725 .sysfs_ops = &slave_sysfs_ops, 1726 #endif 1727 }; 1728 1729 static int bond_kobj_init(struct slave *slave) 1730 { 1731 int err; 1732 1733 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1734 &(slave->dev->dev.kobj), "bonding_slave"); 1735 if (err) 1736 kobject_put(&slave->kobj); 1737 1738 return err; 1739 } 1740 1741 static struct slave *bond_alloc_slave(struct bonding *bond, 1742 struct net_device *slave_dev) 1743 { 1744 struct slave *slave = NULL; 1745 1746 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1747 if (!slave) 1748 return NULL; 1749 1750 slave->bond = bond; 1751 slave->dev = slave_dev; 1752 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1753 1754 if (bond_kobj_init(slave)) 1755 return NULL; 1756 1757 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1758 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1759 GFP_KERNEL); 1760 if (!SLAVE_AD_INFO(slave)) { 1761 kobject_put(&slave->kobj); 1762 return NULL; 1763 } 1764 } 1765 1766 return slave; 1767 } 1768 1769 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1770 { 1771 info->bond_mode = BOND_MODE(bond); 1772 info->miimon = bond->params.miimon; 1773 info->num_slaves = bond->slave_cnt; 1774 } 1775 1776 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1777 { 1778 strcpy(info->slave_name, slave->dev->name); 1779 info->link = slave->link; 1780 info->state = bond_slave_state(slave); 1781 info->link_failure_count = slave->link_failure_count; 1782 } 1783 1784 static void bond_netdev_notify_work(struct work_struct *_work) 1785 { 1786 struct slave *slave = container_of(_work, struct slave, 1787 notify_work.work); 1788 1789 if (rtnl_trylock()) { 1790 struct netdev_bonding_info binfo; 1791 1792 bond_fill_ifslave(slave, &binfo.slave); 1793 bond_fill_ifbond(slave->bond, &binfo.master); 1794 netdev_bonding_info_change(slave->dev, &binfo); 1795 rtnl_unlock(); 1796 } else { 1797 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1798 } 1799 } 1800 1801 void bond_queue_slave_event(struct slave *slave) 1802 { 1803 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1804 } 1805 1806 void bond_lower_state_changed(struct slave *slave) 1807 { 1808 struct netdev_lag_lower_state_info info; 1809 1810 info.link_up = slave->link == BOND_LINK_UP || 1811 slave->link == BOND_LINK_FAIL; 1812 info.tx_enabled = bond_is_active_slave(slave); 1813 netdev_lower_state_changed(slave->dev, &info); 1814 } 1815 1816 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1817 if (extack) \ 1818 NL_SET_ERR_MSG(extack, errmsg); \ 1819 else \ 1820 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1821 } while (0) 1822 1823 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1824 if (extack) \ 1825 NL_SET_ERR_MSG(extack, errmsg); \ 1826 else \ 1827 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1828 } while (0) 1829 1830 /* The bonding driver uses ether_setup() to convert a master bond device 1831 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always 1832 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP 1833 * if they were set 1834 */ 1835 static void bond_ether_setup(struct net_device *bond_dev) 1836 { 1837 unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP); 1838 1839 ether_setup(bond_dev); 1840 bond_dev->flags |= IFF_MASTER | flags; 1841 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1842 } 1843 1844 void bond_xdp_set_features(struct net_device *bond_dev) 1845 { 1846 struct bonding *bond = netdev_priv(bond_dev); 1847 xdp_features_t val = NETDEV_XDP_ACT_MASK; 1848 struct list_head *iter; 1849 struct slave *slave; 1850 1851 ASSERT_RTNL(); 1852 1853 if (!bond_xdp_check(bond) || !bond_has_slaves(bond)) { 1854 xdp_clear_features_flag(bond_dev); 1855 return; 1856 } 1857 1858 bond_for_each_slave(bond, slave, iter) 1859 val &= slave->dev->xdp_features; 1860 1861 val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY; 1862 1863 xdp_set_features_flag(bond_dev, val); 1864 } 1865 1866 /* enslave device <slave> to bond device <master> */ 1867 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1868 struct netlink_ext_ack *extack) 1869 { 1870 struct bonding *bond = netdev_priv(bond_dev); 1871 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1872 struct slave *new_slave = NULL, *prev_slave; 1873 struct sockaddr_storage ss; 1874 int link_reporting; 1875 int res = 0, i; 1876 1877 if (slave_dev->flags & IFF_MASTER && 1878 !netif_is_bond_master(slave_dev)) { 1879 BOND_NL_ERR(bond_dev, extack, 1880 "Device type (master device) cannot be enslaved"); 1881 return -EPERM; 1882 } 1883 1884 if (!bond->params.use_carrier && 1885 slave_dev->ethtool_ops->get_link == NULL && 1886 slave_ops->ndo_eth_ioctl == NULL) { 1887 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1888 } 1889 1890 /* already in-use? */ 1891 if (netdev_is_rx_handler_busy(slave_dev)) { 1892 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1893 "Device is in use and cannot be enslaved"); 1894 return -EBUSY; 1895 } 1896 1897 if (bond_dev == slave_dev) { 1898 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1899 return -EPERM; 1900 } 1901 1902 /* vlan challenged mutual exclusion */ 1903 /* no need to lock since we're protected by rtnl_lock */ 1904 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1905 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1906 if (vlan_uses_dev(bond_dev)) { 1907 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1908 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1909 return -EPERM; 1910 } else { 1911 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1912 } 1913 } else { 1914 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 1915 } 1916 1917 if (slave_dev->features & NETIF_F_HW_ESP) 1918 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 1919 1920 /* Old ifenslave binaries are no longer supported. These can 1921 * be identified with moderate accuracy by the state of the slave: 1922 * the current ifenslave will set the interface down prior to 1923 * enslaving it; the old ifenslave will not. 1924 */ 1925 if (slave_dev->flags & IFF_UP) { 1926 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1927 "Device can not be enslaved while up"); 1928 return -EPERM; 1929 } 1930 1931 /* set bonding device ether type by slave - bonding netdevices are 1932 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 1933 * there is a need to override some of the type dependent attribs/funcs. 1934 * 1935 * bond ether type mutual exclusion - don't allow slaves of dissimilar 1936 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 1937 */ 1938 if (!bond_has_slaves(bond)) { 1939 if (bond_dev->type != slave_dev->type) { 1940 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 1941 bond_dev->type, slave_dev->type); 1942 1943 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 1944 bond_dev); 1945 res = notifier_to_errno(res); 1946 if (res) { 1947 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 1948 return -EBUSY; 1949 } 1950 1951 /* Flush unicast and multicast addresses */ 1952 dev_uc_flush(bond_dev); 1953 dev_mc_flush(bond_dev); 1954 1955 if (slave_dev->type != ARPHRD_ETHER) 1956 bond_setup_by_slave(bond_dev, slave_dev); 1957 else 1958 bond_ether_setup(bond_dev); 1959 1960 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 1961 bond_dev); 1962 } 1963 } else if (bond_dev->type != slave_dev->type) { 1964 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1965 "Device type is different from other slaves"); 1966 return -EINVAL; 1967 } 1968 1969 if (slave_dev->type == ARPHRD_INFINIBAND && 1970 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 1971 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1972 "Only active-backup mode is supported for infiniband slaves"); 1973 res = -EOPNOTSUPP; 1974 goto err_undo_flags; 1975 } 1976 1977 if (!slave_ops->ndo_set_mac_address || 1978 slave_dev->type == ARPHRD_INFINIBAND) { 1979 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 1980 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 1981 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 1982 if (!bond_has_slaves(bond)) { 1983 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 1984 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 1985 } else { 1986 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1987 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 1988 res = -EOPNOTSUPP; 1989 goto err_undo_flags; 1990 } 1991 } 1992 } 1993 1994 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 1995 1996 /* If this is the first slave, then we need to set the master's hardware 1997 * address to be the same as the slave's. 1998 */ 1999 if (!bond_has_slaves(bond) && 2000 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 2001 res = bond_set_dev_addr(bond->dev, slave_dev); 2002 if (res) 2003 goto err_undo_flags; 2004 } 2005 2006 new_slave = bond_alloc_slave(bond, slave_dev); 2007 if (!new_slave) { 2008 res = -ENOMEM; 2009 goto err_undo_flags; 2010 } 2011 2012 /* Set the new_slave's queue_id to be zero. Queue ID mapping 2013 * is set via sysfs or module option if desired. 2014 */ 2015 new_slave->queue_id = 0; 2016 2017 /* Save slave's original mtu and then set it to match the bond */ 2018 new_slave->original_mtu = slave_dev->mtu; 2019 res = dev_set_mtu(slave_dev, bond->dev->mtu); 2020 if (res) { 2021 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 2022 goto err_free; 2023 } 2024 2025 /* Save slave's original ("permanent") mac address for modes 2026 * that need it, and for restoring it upon release, and then 2027 * set it to the master's address 2028 */ 2029 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 2030 slave_dev->addr_len); 2031 2032 if (!bond->params.fail_over_mac || 2033 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2034 /* Set slave to master's mac address. The application already 2035 * set the master's mac address to that of the first slave 2036 */ 2037 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 2038 ss.ss_family = slave_dev->type; 2039 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 2040 extack); 2041 if (res) { 2042 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 2043 goto err_restore_mtu; 2044 } 2045 } 2046 2047 /* set no_addrconf flag before open to prevent IPv6 addrconf */ 2048 slave_dev->priv_flags |= IFF_NO_ADDRCONF; 2049 2050 /* open the slave since the application closed it */ 2051 res = dev_open(slave_dev, extack); 2052 if (res) { 2053 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 2054 goto err_restore_mac; 2055 } 2056 2057 slave_dev->priv_flags |= IFF_BONDING; 2058 /* initialize slave stats */ 2059 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 2060 2061 if (bond_is_lb(bond)) { 2062 /* bond_alb_init_slave() must be called before all other stages since 2063 * it might fail and we do not want to have to undo everything 2064 */ 2065 res = bond_alb_init_slave(bond, new_slave); 2066 if (res) 2067 goto err_close; 2068 } 2069 2070 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 2071 if (res) { 2072 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 2073 goto err_close; 2074 } 2075 2076 prev_slave = bond_last_slave(bond); 2077 2078 new_slave->delay = 0; 2079 new_slave->link_failure_count = 0; 2080 2081 if (bond_update_speed_duplex(new_slave) && 2082 bond_needs_speed_duplex(bond)) 2083 new_slave->link = BOND_LINK_DOWN; 2084 2085 new_slave->last_rx = jiffies - 2086 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2087 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2088 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2089 2090 new_slave->last_tx = new_slave->last_rx; 2091 2092 if (bond->params.miimon && !bond->params.use_carrier) { 2093 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2094 2095 if ((link_reporting == -1) && !bond->params.arp_interval) { 2096 /* miimon is set but a bonded network driver 2097 * does not support ETHTOOL/MII and 2098 * arp_interval is not set. Note: if 2099 * use_carrier is enabled, we will never go 2100 * here (because netif_carrier is always 2101 * supported); thus, we don't need to change 2102 * the messages for netif_carrier. 2103 */ 2104 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"); 2105 } else if (link_reporting == -1) { 2106 /* unable get link status using mii/ethtool */ 2107 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"); 2108 } 2109 } 2110 2111 /* check for initial state */ 2112 new_slave->link = BOND_LINK_NOCHANGE; 2113 if (bond->params.miimon) { 2114 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2115 if (bond->params.updelay) { 2116 bond_set_slave_link_state(new_slave, 2117 BOND_LINK_BACK, 2118 BOND_SLAVE_NOTIFY_NOW); 2119 new_slave->delay = bond->params.updelay; 2120 } else { 2121 bond_set_slave_link_state(new_slave, 2122 BOND_LINK_UP, 2123 BOND_SLAVE_NOTIFY_NOW); 2124 } 2125 } else { 2126 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2127 BOND_SLAVE_NOTIFY_NOW); 2128 } 2129 } else if (bond->params.arp_interval) { 2130 bond_set_slave_link_state(new_slave, 2131 (netif_carrier_ok(slave_dev) ? 2132 BOND_LINK_UP : BOND_LINK_DOWN), 2133 BOND_SLAVE_NOTIFY_NOW); 2134 } else { 2135 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2136 BOND_SLAVE_NOTIFY_NOW); 2137 } 2138 2139 if (new_slave->link != BOND_LINK_DOWN) 2140 new_slave->last_link_up = jiffies; 2141 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2142 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2143 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2144 2145 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2146 /* if there is a primary slave, remember it */ 2147 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2148 rcu_assign_pointer(bond->primary_slave, new_slave); 2149 bond->force_primary = true; 2150 } 2151 } 2152 2153 switch (BOND_MODE(bond)) { 2154 case BOND_MODE_ACTIVEBACKUP: 2155 bond_set_slave_inactive_flags(new_slave, 2156 BOND_SLAVE_NOTIFY_NOW); 2157 break; 2158 case BOND_MODE_8023AD: 2159 /* in 802.3ad mode, the internal mechanism 2160 * will activate the slaves in the selected 2161 * aggregator 2162 */ 2163 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2164 /* if this is the first slave */ 2165 if (!prev_slave) { 2166 SLAVE_AD_INFO(new_slave)->id = 1; 2167 /* Initialize AD with the number of times that the AD timer is called in 1 second 2168 * can be called only after the mac address of the bond is set 2169 */ 2170 bond_3ad_initialize(bond); 2171 } else { 2172 SLAVE_AD_INFO(new_slave)->id = 2173 SLAVE_AD_INFO(prev_slave)->id + 1; 2174 } 2175 2176 bond_3ad_bind_slave(new_slave); 2177 break; 2178 case BOND_MODE_TLB: 2179 case BOND_MODE_ALB: 2180 bond_set_active_slave(new_slave); 2181 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2182 break; 2183 default: 2184 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2185 2186 /* always active in trunk mode */ 2187 bond_set_active_slave(new_slave); 2188 2189 /* In trunking mode there is little meaning to curr_active_slave 2190 * anyway (it holds no special properties of the bond device), 2191 * so we can change it without calling change_active_interface() 2192 */ 2193 if (!rcu_access_pointer(bond->curr_active_slave) && 2194 new_slave->link == BOND_LINK_UP) 2195 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2196 2197 break; 2198 } /* switch(bond_mode) */ 2199 2200 #ifdef CONFIG_NET_POLL_CONTROLLER 2201 if (bond->dev->npinfo) { 2202 if (slave_enable_netpoll(new_slave)) { 2203 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2204 res = -EBUSY; 2205 goto err_detach; 2206 } 2207 } 2208 #endif 2209 2210 if (!(bond_dev->features & NETIF_F_LRO)) 2211 dev_disable_lro(slave_dev); 2212 2213 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2214 new_slave); 2215 if (res) { 2216 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2217 goto err_detach; 2218 } 2219 2220 res = bond_master_upper_dev_link(bond, new_slave, extack); 2221 if (res) { 2222 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2223 goto err_unregister; 2224 } 2225 2226 bond_lower_state_changed(new_slave); 2227 2228 res = bond_sysfs_slave_add(new_slave); 2229 if (res) { 2230 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2231 goto err_upper_unlink; 2232 } 2233 2234 /* If the mode uses primary, then the following is handled by 2235 * bond_change_active_slave(). 2236 */ 2237 if (!bond_uses_primary(bond)) { 2238 /* set promiscuity level to new slave */ 2239 if (bond_dev->flags & IFF_PROMISC) { 2240 res = dev_set_promiscuity(slave_dev, 1); 2241 if (res) 2242 goto err_sysfs_del; 2243 } 2244 2245 /* set allmulti level to new slave */ 2246 if (bond_dev->flags & IFF_ALLMULTI) { 2247 res = dev_set_allmulti(slave_dev, 1); 2248 if (res) { 2249 if (bond_dev->flags & IFF_PROMISC) 2250 dev_set_promiscuity(slave_dev, -1); 2251 goto err_sysfs_del; 2252 } 2253 } 2254 2255 if (bond_dev->flags & IFF_UP) { 2256 netif_addr_lock_bh(bond_dev); 2257 dev_mc_sync_multiple(slave_dev, bond_dev); 2258 dev_uc_sync_multiple(slave_dev, bond_dev); 2259 netif_addr_unlock_bh(bond_dev); 2260 2261 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2262 dev_mc_add(slave_dev, lacpdu_mcast_addr); 2263 } 2264 } 2265 2266 bond->slave_cnt++; 2267 bond_compute_features(bond); 2268 bond_set_carrier(bond); 2269 2270 if (bond_uses_primary(bond)) { 2271 block_netpoll_tx(); 2272 bond_select_active_slave(bond); 2273 unblock_netpoll_tx(); 2274 } 2275 2276 if (bond_mode_can_use_xmit_hash(bond)) 2277 bond_update_slave_arr(bond, NULL); 2278 2279 2280 if (!slave_dev->netdev_ops->ndo_bpf || 2281 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2282 if (bond->xdp_prog) { 2283 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2284 "Slave does not support XDP"); 2285 res = -EOPNOTSUPP; 2286 goto err_sysfs_del; 2287 } 2288 } else if (bond->xdp_prog) { 2289 struct netdev_bpf xdp = { 2290 .command = XDP_SETUP_PROG, 2291 .flags = 0, 2292 .prog = bond->xdp_prog, 2293 .extack = extack, 2294 }; 2295 2296 if (dev_xdp_prog_count(slave_dev) > 0) { 2297 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2298 "Slave has XDP program loaded, please unload before enslaving"); 2299 res = -EOPNOTSUPP; 2300 goto err_sysfs_del; 2301 } 2302 2303 res = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 2304 if (res < 0) { 2305 /* ndo_bpf() sets extack error message */ 2306 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2307 goto err_sysfs_del; 2308 } 2309 if (bond->xdp_prog) 2310 bpf_prog_inc(bond->xdp_prog); 2311 } 2312 2313 bond_xdp_set_features(bond_dev); 2314 2315 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2316 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2317 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2318 2319 /* enslave is successful */ 2320 bond_queue_slave_event(new_slave); 2321 return 0; 2322 2323 /* Undo stages on error */ 2324 err_sysfs_del: 2325 bond_sysfs_slave_del(new_slave); 2326 2327 err_upper_unlink: 2328 bond_upper_dev_unlink(bond, new_slave); 2329 2330 err_unregister: 2331 netdev_rx_handler_unregister(slave_dev); 2332 2333 err_detach: 2334 vlan_vids_del_by_dev(slave_dev, bond_dev); 2335 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2336 RCU_INIT_POINTER(bond->primary_slave, NULL); 2337 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2338 block_netpoll_tx(); 2339 bond_change_active_slave(bond, NULL); 2340 bond_select_active_slave(bond); 2341 unblock_netpoll_tx(); 2342 } 2343 /* either primary_slave or curr_active_slave might've changed */ 2344 synchronize_rcu(); 2345 slave_disable_netpoll(new_slave); 2346 2347 err_close: 2348 if (!netif_is_bond_master(slave_dev)) 2349 slave_dev->priv_flags &= ~IFF_BONDING; 2350 dev_close(slave_dev); 2351 2352 err_restore_mac: 2353 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2354 if (!bond->params.fail_over_mac || 2355 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2356 /* XXX TODO - fom follow mode needs to change master's 2357 * MAC if this slave's MAC is in use by the bond, or at 2358 * least print a warning. 2359 */ 2360 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2361 new_slave->dev->addr_len); 2362 ss.ss_family = slave_dev->type; 2363 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2364 } 2365 2366 err_restore_mtu: 2367 dev_set_mtu(slave_dev, new_slave->original_mtu); 2368 2369 err_free: 2370 kobject_put(&new_slave->kobj); 2371 2372 err_undo_flags: 2373 /* Enslave of first slave has failed and we need to fix master's mac */ 2374 if (!bond_has_slaves(bond)) { 2375 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2376 slave_dev->dev_addr)) 2377 eth_hw_addr_random(bond_dev); 2378 if (bond_dev->type != ARPHRD_ETHER) { 2379 dev_close(bond_dev); 2380 bond_ether_setup(bond_dev); 2381 } 2382 } 2383 2384 return res; 2385 } 2386 2387 /* Try to release the slave device <slave> from the bond device <master> 2388 * It is legal to access curr_active_slave without a lock because all the function 2389 * is RTNL-locked. If "all" is true it means that the function is being called 2390 * while destroying a bond interface and all slaves are being released. 2391 * 2392 * The rules for slave state should be: 2393 * for Active/Backup: 2394 * Active stays on all backups go down 2395 * for Bonded connections: 2396 * The first up interface should be left on and all others downed. 2397 */ 2398 static int __bond_release_one(struct net_device *bond_dev, 2399 struct net_device *slave_dev, 2400 bool all, bool unregister) 2401 { 2402 struct bonding *bond = netdev_priv(bond_dev); 2403 struct slave *slave, *oldcurrent; 2404 struct sockaddr_storage ss; 2405 int old_flags = bond_dev->flags; 2406 netdev_features_t old_features = bond_dev->features; 2407 2408 /* slave is not a slave or master is not master of this slave */ 2409 if (!(slave_dev->flags & IFF_SLAVE) || 2410 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2411 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2412 return -EINVAL; 2413 } 2414 2415 block_netpoll_tx(); 2416 2417 slave = bond_get_slave_by_dev(bond, slave_dev); 2418 if (!slave) { 2419 /* not a slave of this bond */ 2420 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2421 unblock_netpoll_tx(); 2422 return -EINVAL; 2423 } 2424 2425 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2426 2427 bond_sysfs_slave_del(slave); 2428 2429 /* recompute stats just before removing the slave */ 2430 bond_get_stats(bond->dev, &bond->bond_stats); 2431 2432 if (bond->xdp_prog) { 2433 struct netdev_bpf xdp = { 2434 .command = XDP_SETUP_PROG, 2435 .flags = 0, 2436 .prog = NULL, 2437 .extack = NULL, 2438 }; 2439 if (slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp)) 2440 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2441 } 2442 2443 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2444 * for this slave anymore. 2445 */ 2446 netdev_rx_handler_unregister(slave_dev); 2447 2448 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2449 bond_3ad_unbind_slave(slave); 2450 2451 bond_upper_dev_unlink(bond, slave); 2452 2453 if (bond_mode_can_use_xmit_hash(bond)) 2454 bond_update_slave_arr(bond, slave); 2455 2456 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2457 bond_is_active_slave(slave) ? "active" : "backup"); 2458 2459 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2460 2461 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2462 2463 if (!all && (!bond->params.fail_over_mac || 2464 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2465 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2466 bond_has_slaves(bond)) 2467 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", 2468 slave->perm_hwaddr); 2469 } 2470 2471 if (rtnl_dereference(bond->primary_slave) == slave) 2472 RCU_INIT_POINTER(bond->primary_slave, NULL); 2473 2474 if (oldcurrent == slave) 2475 bond_change_active_slave(bond, NULL); 2476 2477 if (bond_is_lb(bond)) { 2478 /* Must be called only after the slave has been 2479 * detached from the list and the curr_active_slave 2480 * has been cleared (if our_slave == old_current), 2481 * but before a new active slave is selected. 2482 */ 2483 bond_alb_deinit_slave(bond, slave); 2484 } 2485 2486 if (all) { 2487 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2488 } else if (oldcurrent == slave) { 2489 /* Note that we hold RTNL over this sequence, so there 2490 * is no concern that another slave add/remove event 2491 * will interfere. 2492 */ 2493 bond_select_active_slave(bond); 2494 } 2495 2496 bond_set_carrier(bond); 2497 if (!bond_has_slaves(bond)) 2498 eth_hw_addr_random(bond_dev); 2499 2500 unblock_netpoll_tx(); 2501 synchronize_rcu(); 2502 bond->slave_cnt--; 2503 2504 if (!bond_has_slaves(bond)) { 2505 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2506 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2507 } 2508 2509 bond_compute_features(bond); 2510 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2511 (old_features & NETIF_F_VLAN_CHALLENGED)) 2512 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2513 2514 vlan_vids_del_by_dev(slave_dev, bond_dev); 2515 2516 /* If the mode uses primary, then this case was handled above by 2517 * bond_change_active_slave(..., NULL) 2518 */ 2519 if (!bond_uses_primary(bond)) { 2520 /* unset promiscuity level from slave 2521 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2522 * of the IFF_PROMISC flag in the bond_dev, but we need the 2523 * value of that flag before that change, as that was the value 2524 * when this slave was attached, so we cache at the start of the 2525 * function and use it here. Same goes for ALLMULTI below 2526 */ 2527 if (old_flags & IFF_PROMISC) 2528 dev_set_promiscuity(slave_dev, -1); 2529 2530 /* unset allmulti level from slave */ 2531 if (old_flags & IFF_ALLMULTI) 2532 dev_set_allmulti(slave_dev, -1); 2533 2534 if (old_flags & IFF_UP) 2535 bond_hw_addr_flush(bond_dev, slave_dev); 2536 } 2537 2538 slave_disable_netpoll(slave); 2539 2540 /* close slave before restoring its mac address */ 2541 dev_close(slave_dev); 2542 2543 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2544 2545 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2546 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2547 /* restore original ("permanent") mac address */ 2548 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2549 slave->dev->addr_len); 2550 ss.ss_family = slave_dev->type; 2551 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2552 } 2553 2554 if (unregister) 2555 __dev_set_mtu(slave_dev, slave->original_mtu); 2556 else 2557 dev_set_mtu(slave_dev, slave->original_mtu); 2558 2559 if (!netif_is_bond_master(slave_dev)) 2560 slave_dev->priv_flags &= ~IFF_BONDING; 2561 2562 bond_xdp_set_features(bond_dev); 2563 kobject_put(&slave->kobj); 2564 2565 return 0; 2566 } 2567 2568 /* A wrapper used because of ndo_del_link */ 2569 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2570 { 2571 return __bond_release_one(bond_dev, slave_dev, false, false); 2572 } 2573 2574 /* First release a slave and then destroy the bond if no more slaves are left. 2575 * Must be under rtnl_lock when this function is called. 2576 */ 2577 static int bond_release_and_destroy(struct net_device *bond_dev, 2578 struct net_device *slave_dev) 2579 { 2580 struct bonding *bond = netdev_priv(bond_dev); 2581 int ret; 2582 2583 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2584 if (ret == 0 && !bond_has_slaves(bond) && 2585 bond_dev->reg_state != NETREG_UNREGISTERING) { 2586 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2587 netdev_info(bond_dev, "Destroying bond\n"); 2588 bond_remove_proc_entry(bond); 2589 unregister_netdevice(bond_dev); 2590 } 2591 return ret; 2592 } 2593 2594 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2595 { 2596 struct bonding *bond = netdev_priv(bond_dev); 2597 2598 bond_fill_ifbond(bond, info); 2599 } 2600 2601 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2602 { 2603 struct bonding *bond = netdev_priv(bond_dev); 2604 struct list_head *iter; 2605 int i = 0, res = -ENODEV; 2606 struct slave *slave; 2607 2608 bond_for_each_slave(bond, slave, iter) { 2609 if (i++ == (int)info->slave_id) { 2610 res = 0; 2611 bond_fill_ifslave(slave, info); 2612 break; 2613 } 2614 } 2615 2616 return res; 2617 } 2618 2619 /*-------------------------------- Monitoring -------------------------------*/ 2620 2621 /* called with rcu_read_lock() */ 2622 static int bond_miimon_inspect(struct bonding *bond) 2623 { 2624 bool ignore_updelay = false; 2625 int link_state, commit = 0; 2626 struct list_head *iter; 2627 struct slave *slave; 2628 2629 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 2630 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2631 } else { 2632 struct bond_up_slave *usable_slaves; 2633 2634 usable_slaves = rcu_dereference(bond->usable_slaves); 2635 2636 if (usable_slaves && usable_slaves->count == 0) 2637 ignore_updelay = true; 2638 } 2639 2640 bond_for_each_slave_rcu(bond, slave, iter) { 2641 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2642 2643 link_state = bond_check_dev_link(bond, slave->dev, 0); 2644 2645 switch (slave->link) { 2646 case BOND_LINK_UP: 2647 if (link_state) 2648 continue; 2649 2650 bond_propose_link_state(slave, BOND_LINK_FAIL); 2651 commit++; 2652 slave->delay = bond->params.downdelay; 2653 if (slave->delay && net_ratelimit()) { 2654 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2655 (BOND_MODE(bond) == 2656 BOND_MODE_ACTIVEBACKUP) ? 2657 (bond_is_active_slave(slave) ? 2658 "active " : "backup ") : "", 2659 bond->params.downdelay * bond->params.miimon); 2660 } 2661 fallthrough; 2662 case BOND_LINK_FAIL: 2663 if (link_state) { 2664 /* recovered before downdelay expired */ 2665 bond_propose_link_state(slave, BOND_LINK_UP); 2666 slave->last_link_up = jiffies; 2667 if (net_ratelimit()) 2668 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2669 (bond->params.downdelay - slave->delay) * 2670 bond->params.miimon); 2671 commit++; 2672 continue; 2673 } 2674 2675 if (slave->delay <= 0) { 2676 bond_propose_link_state(slave, BOND_LINK_DOWN); 2677 commit++; 2678 continue; 2679 } 2680 2681 slave->delay--; 2682 break; 2683 2684 case BOND_LINK_DOWN: 2685 if (!link_state) 2686 continue; 2687 2688 bond_propose_link_state(slave, BOND_LINK_BACK); 2689 commit++; 2690 slave->delay = bond->params.updelay; 2691 2692 if (slave->delay && net_ratelimit()) { 2693 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2694 ignore_updelay ? 0 : 2695 bond->params.updelay * 2696 bond->params.miimon); 2697 } 2698 fallthrough; 2699 case BOND_LINK_BACK: 2700 if (!link_state) { 2701 bond_propose_link_state(slave, BOND_LINK_DOWN); 2702 if (net_ratelimit()) 2703 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2704 (bond->params.updelay - slave->delay) * 2705 bond->params.miimon); 2706 commit++; 2707 continue; 2708 } 2709 2710 if (ignore_updelay) 2711 slave->delay = 0; 2712 2713 if (slave->delay <= 0) { 2714 bond_propose_link_state(slave, BOND_LINK_UP); 2715 commit++; 2716 ignore_updelay = false; 2717 continue; 2718 } 2719 2720 slave->delay--; 2721 break; 2722 } 2723 } 2724 2725 return commit; 2726 } 2727 2728 static void bond_miimon_link_change(struct bonding *bond, 2729 struct slave *slave, 2730 char link) 2731 { 2732 switch (BOND_MODE(bond)) { 2733 case BOND_MODE_8023AD: 2734 bond_3ad_handle_link_change(slave, link); 2735 break; 2736 case BOND_MODE_TLB: 2737 case BOND_MODE_ALB: 2738 bond_alb_handle_link_change(bond, slave, link); 2739 break; 2740 case BOND_MODE_XOR: 2741 bond_update_slave_arr(bond, NULL); 2742 break; 2743 } 2744 } 2745 2746 static void bond_miimon_commit(struct bonding *bond) 2747 { 2748 struct slave *slave, *primary, *active; 2749 bool do_failover = false; 2750 struct list_head *iter; 2751 2752 ASSERT_RTNL(); 2753 2754 bond_for_each_slave(bond, slave, iter) { 2755 switch (slave->link_new_state) { 2756 case BOND_LINK_NOCHANGE: 2757 /* For 802.3ad mode, check current slave speed and 2758 * duplex again in case its port was disabled after 2759 * invalid speed/duplex reporting but recovered before 2760 * link monitoring could make a decision on the actual 2761 * link status 2762 */ 2763 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2764 slave->link == BOND_LINK_UP) 2765 bond_3ad_adapter_speed_duplex_changed(slave); 2766 continue; 2767 2768 case BOND_LINK_UP: 2769 if (bond_update_speed_duplex(slave) && 2770 bond_needs_speed_duplex(bond)) { 2771 slave->link = BOND_LINK_DOWN; 2772 if (net_ratelimit()) 2773 slave_warn(bond->dev, slave->dev, 2774 "failed to get link speed/duplex\n"); 2775 continue; 2776 } 2777 bond_set_slave_link_state(slave, BOND_LINK_UP, 2778 BOND_SLAVE_NOTIFY_NOW); 2779 slave->last_link_up = jiffies; 2780 2781 primary = rtnl_dereference(bond->primary_slave); 2782 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2783 /* prevent it from being the active one */ 2784 bond_set_backup_slave(slave); 2785 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2786 /* make it immediately active */ 2787 bond_set_active_slave(slave); 2788 } 2789 2790 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2791 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2792 slave->duplex ? "full" : "half"); 2793 2794 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2795 2796 active = rtnl_dereference(bond->curr_active_slave); 2797 if (!active || slave == primary || slave->prio > active->prio) 2798 do_failover = true; 2799 2800 continue; 2801 2802 case BOND_LINK_DOWN: 2803 if (slave->link_failure_count < UINT_MAX) 2804 slave->link_failure_count++; 2805 2806 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2807 BOND_SLAVE_NOTIFY_NOW); 2808 2809 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2810 BOND_MODE(bond) == BOND_MODE_8023AD) 2811 bond_set_slave_inactive_flags(slave, 2812 BOND_SLAVE_NOTIFY_NOW); 2813 2814 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2815 2816 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2817 2818 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2819 do_failover = true; 2820 2821 continue; 2822 2823 default: 2824 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2825 slave->link_new_state); 2826 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2827 2828 continue; 2829 } 2830 } 2831 2832 if (do_failover) { 2833 block_netpoll_tx(); 2834 bond_select_active_slave(bond); 2835 unblock_netpoll_tx(); 2836 } 2837 2838 bond_set_carrier(bond); 2839 } 2840 2841 /* bond_mii_monitor 2842 * 2843 * Really a wrapper that splits the mii monitor into two phases: an 2844 * inspection, then (if inspection indicates something needs to be done) 2845 * an acquisition of appropriate locks followed by a commit phase to 2846 * implement whatever link state changes are indicated. 2847 */ 2848 static void bond_mii_monitor(struct work_struct *work) 2849 { 2850 struct bonding *bond = container_of(work, struct bonding, 2851 mii_work.work); 2852 bool should_notify_peers = false; 2853 bool commit; 2854 unsigned long delay; 2855 struct slave *slave; 2856 struct list_head *iter; 2857 2858 delay = msecs_to_jiffies(bond->params.miimon); 2859 2860 if (!bond_has_slaves(bond)) 2861 goto re_arm; 2862 2863 rcu_read_lock(); 2864 should_notify_peers = bond_should_notify_peers(bond); 2865 commit = !!bond_miimon_inspect(bond); 2866 if (bond->send_peer_notif) { 2867 rcu_read_unlock(); 2868 if (rtnl_trylock()) { 2869 bond->send_peer_notif--; 2870 rtnl_unlock(); 2871 } 2872 } else { 2873 rcu_read_unlock(); 2874 } 2875 2876 if (commit) { 2877 /* Race avoidance with bond_close cancel of workqueue */ 2878 if (!rtnl_trylock()) { 2879 delay = 1; 2880 should_notify_peers = false; 2881 goto re_arm; 2882 } 2883 2884 bond_for_each_slave(bond, slave, iter) { 2885 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2886 } 2887 bond_miimon_commit(bond); 2888 2889 rtnl_unlock(); /* might sleep, hold no other locks */ 2890 } 2891 2892 re_arm: 2893 if (bond->params.miimon) 2894 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2895 2896 if (should_notify_peers) { 2897 if (!rtnl_trylock()) 2898 return; 2899 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2900 rtnl_unlock(); 2901 } 2902 } 2903 2904 static int bond_upper_dev_walk(struct net_device *upper, 2905 struct netdev_nested_priv *priv) 2906 { 2907 __be32 ip = *(__be32 *)priv->data; 2908 2909 return ip == bond_confirm_addr(upper, 0, ip); 2910 } 2911 2912 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 2913 { 2914 struct netdev_nested_priv priv = { 2915 .data = (void *)&ip, 2916 }; 2917 bool ret = false; 2918 2919 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 2920 return true; 2921 2922 rcu_read_lock(); 2923 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 2924 ret = true; 2925 rcu_read_unlock(); 2926 2927 return ret; 2928 } 2929 2930 #define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff) 2931 2932 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 2933 struct sk_buff *skb) 2934 { 2935 struct net_device *bond_dev = slave->bond->dev; 2936 struct net_device *slave_dev = slave->dev; 2937 struct bond_vlan_tag *outer_tag = tags; 2938 2939 if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE) 2940 return true; 2941 2942 tags++; 2943 2944 /* Go through all the tags backwards and add them to the packet */ 2945 while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) { 2946 if (!tags->vlan_id) { 2947 tags++; 2948 continue; 2949 } 2950 2951 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 2952 ntohs(outer_tag->vlan_proto), tags->vlan_id); 2953 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 2954 tags->vlan_id); 2955 if (!skb) { 2956 net_err_ratelimited("failed to insert inner VLAN tag\n"); 2957 return false; 2958 } 2959 2960 tags++; 2961 } 2962 /* Set the outer tag */ 2963 if (outer_tag->vlan_id) { 2964 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 2965 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 2966 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 2967 outer_tag->vlan_id); 2968 } 2969 2970 return true; 2971 } 2972 2973 /* We go to the (large) trouble of VLAN tagging ARP frames because 2974 * switches in VLAN mode (especially if ports are configured as 2975 * "native" to a VLAN) might not pass non-tagged frames. 2976 */ 2977 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 2978 __be32 src_ip, struct bond_vlan_tag *tags) 2979 { 2980 struct net_device *bond_dev = slave->bond->dev; 2981 struct net_device *slave_dev = slave->dev; 2982 struct sk_buff *skb; 2983 2984 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 2985 arp_op, &dest_ip, &src_ip); 2986 2987 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 2988 NULL, slave_dev->dev_addr, NULL); 2989 2990 if (!skb) { 2991 net_err_ratelimited("ARP packet allocation failed\n"); 2992 return; 2993 } 2994 2995 if (bond_handle_vlan(slave, tags, skb)) { 2996 slave_update_last_tx(slave); 2997 arp_xmit(skb); 2998 } 2999 3000 return; 3001 } 3002 3003 /* Validate the device path between the @start_dev and the @end_dev. 3004 * The path is valid if the @end_dev is reachable through device 3005 * stacking. 3006 * When the path is validated, collect any vlan information in the 3007 * path. 3008 */ 3009 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 3010 struct net_device *end_dev, 3011 int level) 3012 { 3013 struct bond_vlan_tag *tags; 3014 struct net_device *upper; 3015 struct list_head *iter; 3016 3017 if (start_dev == end_dev) { 3018 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 3019 if (!tags) 3020 return ERR_PTR(-ENOMEM); 3021 tags[level].vlan_proto = BOND_VLAN_PROTO_NONE; 3022 return tags; 3023 } 3024 3025 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 3026 tags = bond_verify_device_path(upper, end_dev, level + 1); 3027 if (IS_ERR_OR_NULL(tags)) { 3028 if (IS_ERR(tags)) 3029 return tags; 3030 continue; 3031 } 3032 if (is_vlan_dev(upper)) { 3033 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 3034 tags[level].vlan_id = vlan_dev_vlan_id(upper); 3035 } 3036 3037 return tags; 3038 } 3039 3040 return NULL; 3041 } 3042 3043 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 3044 { 3045 struct rtable *rt; 3046 struct bond_vlan_tag *tags; 3047 __be32 *targets = bond->params.arp_targets, addr; 3048 int i; 3049 3050 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 3051 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 3052 __func__, &targets[i]); 3053 tags = NULL; 3054 3055 /* Find out through which dev should the packet go */ 3056 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 0, 0, 3057 RT_SCOPE_LINK); 3058 if (IS_ERR(rt)) { 3059 /* there's no route to target - try to send arp 3060 * probe to generate any traffic (arp_validate=0) 3061 */ 3062 if (bond->params.arp_validate) 3063 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 3064 bond->dev->name, 3065 &targets[i]); 3066 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 3067 0, tags); 3068 continue; 3069 } 3070 3071 /* bond device itself */ 3072 if (rt->dst.dev == bond->dev) 3073 goto found; 3074 3075 rcu_read_lock(); 3076 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 3077 rcu_read_unlock(); 3078 3079 if (!IS_ERR_OR_NULL(tags)) 3080 goto found; 3081 3082 /* Not our device - skip */ 3083 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 3084 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 3085 3086 ip_rt_put(rt); 3087 continue; 3088 3089 found: 3090 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 3091 ip_rt_put(rt); 3092 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 3093 kfree(tags); 3094 } 3095 } 3096 3097 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 3098 { 3099 int i; 3100 3101 if (!sip || !bond_has_this_ip(bond, tip)) { 3102 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 3103 __func__, &sip, &tip); 3104 return; 3105 } 3106 3107 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3108 if (i == -1) { 3109 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3110 __func__, &sip); 3111 return; 3112 } 3113 slave->last_rx = jiffies; 3114 slave->target_last_arp_rx[i] = jiffies; 3115 } 3116 3117 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3118 struct slave *slave) 3119 { 3120 struct arphdr *arp = (struct arphdr *)skb->data; 3121 struct slave *curr_active_slave, *curr_arp_slave; 3122 unsigned char *arp_ptr; 3123 __be32 sip, tip; 3124 unsigned int alen; 3125 3126 alen = arp_hdr_len(bond->dev); 3127 3128 if (alen > skb_headlen(skb)) { 3129 arp = kmalloc(alen, GFP_ATOMIC); 3130 if (!arp) 3131 goto out_unlock; 3132 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3133 goto out_unlock; 3134 } 3135 3136 if (arp->ar_hln != bond->dev->addr_len || 3137 skb->pkt_type == PACKET_OTHERHOST || 3138 skb->pkt_type == PACKET_LOOPBACK || 3139 arp->ar_hrd != htons(ARPHRD_ETHER) || 3140 arp->ar_pro != htons(ETH_P_IP) || 3141 arp->ar_pln != 4) 3142 goto out_unlock; 3143 3144 arp_ptr = (unsigned char *)(arp + 1); 3145 arp_ptr += bond->dev->addr_len; 3146 memcpy(&sip, arp_ptr, 4); 3147 arp_ptr += 4 + bond->dev->addr_len; 3148 memcpy(&tip, arp_ptr, 4); 3149 3150 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3151 __func__, slave->dev->name, bond_slave_state(slave), 3152 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3153 &sip, &tip); 3154 3155 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3156 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3157 3158 /* We 'trust' the received ARP enough to validate it if: 3159 * 3160 * (a) the slave receiving the ARP is active (which includes the 3161 * current ARP slave, if any), or 3162 * 3163 * (b) the receiving slave isn't active, but there is a currently 3164 * active slave and it received valid arp reply(s) after it became 3165 * the currently active slave, or 3166 * 3167 * (c) there is an ARP slave that sent an ARP during the prior ARP 3168 * interval, and we receive an ARP reply on any slave. We accept 3169 * these because switch FDB update delays may deliver the ARP 3170 * reply to a slave other than the sender of the ARP request. 3171 * 3172 * Note: for (b), backup slaves are receiving the broadcast ARP 3173 * request, not a reply. This request passes from the sending 3174 * slave through the L2 switch(es) to the receiving slave. Since 3175 * this is checking the request, sip/tip are swapped for 3176 * validation. 3177 * 3178 * This is done to avoid endless looping when we can't reach the 3179 * arp_ip_target and fool ourselves with our own arp requests. 3180 */ 3181 if (bond_is_active_slave(slave)) 3182 bond_validate_arp(bond, slave, sip, tip); 3183 else if (curr_active_slave && 3184 time_after(slave_last_rx(bond, curr_active_slave), 3185 curr_active_slave->last_link_up)) 3186 bond_validate_arp(bond, slave, tip, sip); 3187 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3188 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3189 bond_validate_arp(bond, slave, sip, tip); 3190 3191 out_unlock: 3192 if (arp != (struct arphdr *)skb->data) 3193 kfree(arp); 3194 return RX_HANDLER_ANOTHER; 3195 } 3196 3197 #if IS_ENABLED(CONFIG_IPV6) 3198 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3199 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3200 { 3201 struct net_device *bond_dev = slave->bond->dev; 3202 struct net_device *slave_dev = slave->dev; 3203 struct in6_addr mcaddr; 3204 struct sk_buff *skb; 3205 3206 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3207 daddr, saddr); 3208 3209 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3210 if (!skb) { 3211 net_err_ratelimited("NS packet allocation failed\n"); 3212 return; 3213 } 3214 3215 addrconf_addr_solict_mult(daddr, &mcaddr); 3216 if (bond_handle_vlan(slave, tags, skb)) { 3217 slave_update_last_tx(slave); 3218 ndisc_send_skb(skb, &mcaddr, saddr); 3219 } 3220 } 3221 3222 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3223 { 3224 struct in6_addr *targets = bond->params.ns_targets; 3225 struct bond_vlan_tag *tags; 3226 struct dst_entry *dst; 3227 struct in6_addr saddr; 3228 struct flowi6 fl6; 3229 int i; 3230 3231 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3232 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3233 __func__, &targets[i]); 3234 tags = NULL; 3235 3236 /* Find out through which dev should the packet go */ 3237 memset(&fl6, 0, sizeof(struct flowi6)); 3238 fl6.daddr = targets[i]; 3239 fl6.flowi6_oif = bond->dev->ifindex; 3240 3241 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3242 if (dst->error) { 3243 dst_release(dst); 3244 /* there's no route to target - try to send arp 3245 * probe to generate any traffic (arp_validate=0) 3246 */ 3247 if (bond->params.arp_validate) 3248 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3249 bond->dev->name, 3250 &targets[i]); 3251 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3252 continue; 3253 } 3254 3255 /* bond device itself */ 3256 if (dst->dev == bond->dev) 3257 goto found; 3258 3259 rcu_read_lock(); 3260 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3261 rcu_read_unlock(); 3262 3263 if (!IS_ERR_OR_NULL(tags)) 3264 goto found; 3265 3266 /* Not our device - skip */ 3267 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3268 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3269 3270 dst_release(dst); 3271 continue; 3272 3273 found: 3274 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3275 bond_ns_send(slave, &targets[i], &saddr, tags); 3276 else 3277 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3278 3279 dst_release(dst); 3280 kfree(tags); 3281 } 3282 } 3283 3284 static int bond_confirm_addr6(struct net_device *dev, 3285 struct netdev_nested_priv *priv) 3286 { 3287 struct in6_addr *addr = (struct in6_addr *)priv->data; 3288 3289 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3290 } 3291 3292 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3293 { 3294 struct netdev_nested_priv priv = { 3295 .data = addr, 3296 }; 3297 int ret = false; 3298 3299 if (bond_confirm_addr6(bond->dev, &priv)) 3300 return true; 3301 3302 rcu_read_lock(); 3303 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3304 ret = true; 3305 rcu_read_unlock(); 3306 3307 return ret; 3308 } 3309 3310 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3311 struct in6_addr *saddr, struct in6_addr *daddr) 3312 { 3313 int i; 3314 3315 /* Ignore NAs that: 3316 * 1. Source address is unspecified address. 3317 * 2. Dest address is neither all-nodes multicast address nor 3318 * exist on bond interface. 3319 */ 3320 if (ipv6_addr_any(saddr) || 3321 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3322 !bond_has_this_ip6(bond, daddr))) { 3323 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3324 __func__, saddr, daddr); 3325 return; 3326 } 3327 3328 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3329 if (i == -1) { 3330 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3331 __func__, saddr); 3332 return; 3333 } 3334 slave->last_rx = jiffies; 3335 slave->target_last_arp_rx[i] = jiffies; 3336 } 3337 3338 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3339 struct slave *slave) 3340 { 3341 struct slave *curr_active_slave, *curr_arp_slave; 3342 struct in6_addr *saddr, *daddr; 3343 struct { 3344 struct ipv6hdr ip6; 3345 struct icmp6hdr icmp6; 3346 } *combined, _combined; 3347 3348 if (skb->pkt_type == PACKET_OTHERHOST || 3349 skb->pkt_type == PACKET_LOOPBACK) 3350 goto out; 3351 3352 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined); 3353 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP || 3354 (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION && 3355 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)) 3356 goto out; 3357 3358 saddr = &combined->ip6.saddr; 3359 daddr = &combined->ip6.daddr; 3360 3361 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3362 __func__, slave->dev->name, bond_slave_state(slave), 3363 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3364 saddr, daddr); 3365 3366 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3367 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3368 3369 /* We 'trust' the received ARP enough to validate it if: 3370 * see bond_arp_rcv(). 3371 */ 3372 if (bond_is_active_slave(slave)) 3373 bond_validate_na(bond, slave, saddr, daddr); 3374 else if (curr_active_slave && 3375 time_after(slave_last_rx(bond, curr_active_slave), 3376 curr_active_slave->last_link_up)) 3377 bond_validate_na(bond, slave, daddr, saddr); 3378 else if (curr_arp_slave && 3379 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3380 bond_validate_na(bond, slave, saddr, daddr); 3381 3382 out: 3383 return RX_HANDLER_ANOTHER; 3384 } 3385 #endif 3386 3387 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3388 struct slave *slave) 3389 { 3390 #if IS_ENABLED(CONFIG_IPV6) 3391 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3392 #endif 3393 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3394 3395 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3396 __func__, skb->dev->name); 3397 3398 /* Use arp validate logic for both ARP and NS */ 3399 if (!slave_do_arp_validate(bond, slave)) { 3400 if ((slave_do_arp_validate_only(bond) && is_arp) || 3401 #if IS_ENABLED(CONFIG_IPV6) 3402 (slave_do_arp_validate_only(bond) && is_ipv6) || 3403 #endif 3404 !slave_do_arp_validate_only(bond)) 3405 slave->last_rx = jiffies; 3406 return RX_HANDLER_ANOTHER; 3407 } else if (is_arp) { 3408 return bond_arp_rcv(skb, bond, slave); 3409 #if IS_ENABLED(CONFIG_IPV6) 3410 } else if (is_ipv6) { 3411 return bond_na_rcv(skb, bond, slave); 3412 #endif 3413 } else { 3414 return RX_HANDLER_ANOTHER; 3415 } 3416 } 3417 3418 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3419 { 3420 bond_arp_send_all(bond, slave); 3421 #if IS_ENABLED(CONFIG_IPV6) 3422 bond_ns_send_all(bond, slave); 3423 #endif 3424 } 3425 3426 /* function to verify if we're in the arp_interval timeslice, returns true if 3427 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3428 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3429 */ 3430 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3431 int mod) 3432 { 3433 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3434 3435 return time_in_range(jiffies, 3436 last_act - delta_in_ticks, 3437 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3438 } 3439 3440 /* This function is called regularly to monitor each slave's link 3441 * ensuring that traffic is being sent and received when arp monitoring 3442 * is used in load-balancing mode. if the adapter has been dormant, then an 3443 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3444 * arp monitoring in active backup mode. 3445 */ 3446 static void bond_loadbalance_arp_mon(struct bonding *bond) 3447 { 3448 struct slave *slave, *oldcurrent; 3449 struct list_head *iter; 3450 int do_failover = 0, slave_state_changed = 0; 3451 3452 if (!bond_has_slaves(bond)) 3453 goto re_arm; 3454 3455 rcu_read_lock(); 3456 3457 oldcurrent = rcu_dereference(bond->curr_active_slave); 3458 /* see if any of the previous devices are up now (i.e. they have 3459 * xmt and rcv traffic). the curr_active_slave does not come into 3460 * the picture unless it is null. also, slave->last_link_up is not 3461 * needed here because we send an arp on each slave and give a slave 3462 * as long as it needs to get the tx/rx within the delta. 3463 * TODO: what about up/down delay in arp mode? it wasn't here before 3464 * so it can wait 3465 */ 3466 bond_for_each_slave_rcu(bond, slave, iter) { 3467 unsigned long last_tx = slave_last_tx(slave); 3468 3469 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3470 3471 if (slave->link != BOND_LINK_UP) { 3472 if (bond_time_in_interval(bond, last_tx, 1) && 3473 bond_time_in_interval(bond, slave->last_rx, 1)) { 3474 3475 bond_propose_link_state(slave, BOND_LINK_UP); 3476 slave_state_changed = 1; 3477 3478 /* primary_slave has no meaning in round-robin 3479 * mode. the window of a slave being up and 3480 * curr_active_slave being null after enslaving 3481 * is closed. 3482 */ 3483 if (!oldcurrent) { 3484 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3485 do_failover = 1; 3486 } else { 3487 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3488 } 3489 } 3490 } else { 3491 /* slave->link == BOND_LINK_UP */ 3492 3493 /* not all switches will respond to an arp request 3494 * when the source ip is 0, so don't take the link down 3495 * if we don't know our ip yet 3496 */ 3497 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3498 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3499 3500 bond_propose_link_state(slave, BOND_LINK_DOWN); 3501 slave_state_changed = 1; 3502 3503 if (slave->link_failure_count < UINT_MAX) 3504 slave->link_failure_count++; 3505 3506 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3507 3508 if (slave == oldcurrent) 3509 do_failover = 1; 3510 } 3511 } 3512 3513 /* note: if switch is in round-robin mode, all links 3514 * must tx arp to ensure all links rx an arp - otherwise 3515 * links may oscillate or not come up at all; if switch is 3516 * in something like xor mode, there is nothing we can 3517 * do - all replies will be rx'ed on same link causing slaves 3518 * to be unstable during low/no traffic periods 3519 */ 3520 if (bond_slave_is_up(slave)) 3521 bond_send_validate(bond, slave); 3522 } 3523 3524 rcu_read_unlock(); 3525 3526 if (do_failover || slave_state_changed) { 3527 if (!rtnl_trylock()) 3528 goto re_arm; 3529 3530 bond_for_each_slave(bond, slave, iter) { 3531 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3532 slave->link = slave->link_new_state; 3533 } 3534 3535 if (slave_state_changed) { 3536 bond_slave_state_change(bond); 3537 if (BOND_MODE(bond) == BOND_MODE_XOR) 3538 bond_update_slave_arr(bond, NULL); 3539 } 3540 if (do_failover) { 3541 block_netpoll_tx(); 3542 bond_select_active_slave(bond); 3543 unblock_netpoll_tx(); 3544 } 3545 rtnl_unlock(); 3546 } 3547 3548 re_arm: 3549 if (bond->params.arp_interval) 3550 queue_delayed_work(bond->wq, &bond->arp_work, 3551 msecs_to_jiffies(bond->params.arp_interval)); 3552 } 3553 3554 /* Called to inspect slaves for active-backup mode ARP monitor link state 3555 * changes. Sets proposed link state in slaves to specify what action 3556 * should take place for the slave. Returns 0 if no changes are found, >0 3557 * if changes to link states must be committed. 3558 * 3559 * Called with rcu_read_lock held. 3560 */ 3561 static int bond_ab_arp_inspect(struct bonding *bond) 3562 { 3563 unsigned long last_tx, last_rx; 3564 struct list_head *iter; 3565 struct slave *slave; 3566 int commit = 0; 3567 3568 bond_for_each_slave_rcu(bond, slave, iter) { 3569 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3570 last_rx = slave_last_rx(bond, slave); 3571 3572 if (slave->link != BOND_LINK_UP) { 3573 if (bond_time_in_interval(bond, last_rx, 1)) { 3574 bond_propose_link_state(slave, BOND_LINK_UP); 3575 commit++; 3576 } else if (slave->link == BOND_LINK_BACK) { 3577 bond_propose_link_state(slave, BOND_LINK_FAIL); 3578 commit++; 3579 } 3580 continue; 3581 } 3582 3583 /* Give slaves 2*delta after being enslaved or made 3584 * active. This avoids bouncing, as the last receive 3585 * times need a full ARP monitor cycle to be updated. 3586 */ 3587 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3588 continue; 3589 3590 /* Backup slave is down if: 3591 * - No current_arp_slave AND 3592 * - more than (missed_max+1)*delta since last receive AND 3593 * - the bond has an IP address 3594 * 3595 * Note: a non-null current_arp_slave indicates 3596 * the curr_active_slave went down and we are 3597 * searching for a new one; under this condition 3598 * we only take the curr_active_slave down - this 3599 * gives each slave a chance to tx/rx traffic 3600 * before being taken out 3601 */ 3602 if (!bond_is_active_slave(slave) && 3603 !rcu_access_pointer(bond->current_arp_slave) && 3604 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3605 bond_propose_link_state(slave, BOND_LINK_DOWN); 3606 commit++; 3607 } 3608 3609 /* Active slave is down if: 3610 * - more than missed_max*delta since transmitting OR 3611 * - (more than missed_max*delta since receive AND 3612 * the bond has an IP address) 3613 */ 3614 last_tx = slave_last_tx(slave); 3615 if (bond_is_active_slave(slave) && 3616 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3617 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3618 bond_propose_link_state(slave, BOND_LINK_DOWN); 3619 commit++; 3620 } 3621 } 3622 3623 return commit; 3624 } 3625 3626 /* Called to commit link state changes noted by inspection step of 3627 * active-backup mode ARP monitor. 3628 * 3629 * Called with RTNL hold. 3630 */ 3631 static void bond_ab_arp_commit(struct bonding *bond) 3632 { 3633 bool do_failover = false; 3634 struct list_head *iter; 3635 unsigned long last_tx; 3636 struct slave *slave; 3637 3638 bond_for_each_slave(bond, slave, iter) { 3639 switch (slave->link_new_state) { 3640 case BOND_LINK_NOCHANGE: 3641 continue; 3642 3643 case BOND_LINK_UP: 3644 last_tx = slave_last_tx(slave); 3645 if (rtnl_dereference(bond->curr_active_slave) != slave || 3646 (!rtnl_dereference(bond->curr_active_slave) && 3647 bond_time_in_interval(bond, last_tx, 1))) { 3648 struct slave *current_arp_slave; 3649 3650 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3651 bond_set_slave_link_state(slave, BOND_LINK_UP, 3652 BOND_SLAVE_NOTIFY_NOW); 3653 if (current_arp_slave) { 3654 bond_set_slave_inactive_flags( 3655 current_arp_slave, 3656 BOND_SLAVE_NOTIFY_NOW); 3657 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3658 } 3659 3660 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3661 3662 if (!rtnl_dereference(bond->curr_active_slave) || 3663 slave == rtnl_dereference(bond->primary_slave) || 3664 slave->prio > rtnl_dereference(bond->curr_active_slave)->prio) 3665 do_failover = true; 3666 3667 } 3668 3669 continue; 3670 3671 case BOND_LINK_DOWN: 3672 if (slave->link_failure_count < UINT_MAX) 3673 slave->link_failure_count++; 3674 3675 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3676 BOND_SLAVE_NOTIFY_NOW); 3677 bond_set_slave_inactive_flags(slave, 3678 BOND_SLAVE_NOTIFY_NOW); 3679 3680 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3681 3682 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3683 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3684 do_failover = true; 3685 } 3686 3687 continue; 3688 3689 case BOND_LINK_FAIL: 3690 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3691 BOND_SLAVE_NOTIFY_NOW); 3692 bond_set_slave_inactive_flags(slave, 3693 BOND_SLAVE_NOTIFY_NOW); 3694 3695 /* A slave has just been enslaved and has become 3696 * the current active slave. 3697 */ 3698 if (rtnl_dereference(bond->curr_active_slave)) 3699 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3700 continue; 3701 3702 default: 3703 slave_err(bond->dev, slave->dev, 3704 "impossible: link_new_state %d on slave\n", 3705 slave->link_new_state); 3706 continue; 3707 } 3708 } 3709 3710 if (do_failover) { 3711 block_netpoll_tx(); 3712 bond_select_active_slave(bond); 3713 unblock_netpoll_tx(); 3714 } 3715 3716 bond_set_carrier(bond); 3717 } 3718 3719 /* Send ARP probes for active-backup mode ARP monitor. 3720 * 3721 * Called with rcu_read_lock held. 3722 */ 3723 static bool bond_ab_arp_probe(struct bonding *bond) 3724 { 3725 struct slave *slave, *before = NULL, *new_slave = NULL, 3726 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3727 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3728 struct list_head *iter; 3729 bool found = false; 3730 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3731 3732 if (curr_arp_slave && curr_active_slave) 3733 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3734 curr_arp_slave->dev->name, 3735 curr_active_slave->dev->name); 3736 3737 if (curr_active_slave) { 3738 bond_send_validate(bond, curr_active_slave); 3739 return should_notify_rtnl; 3740 } 3741 3742 /* if we don't have a curr_active_slave, search for the next available 3743 * backup slave from the current_arp_slave and make it the candidate 3744 * for becoming the curr_active_slave 3745 */ 3746 3747 if (!curr_arp_slave) { 3748 curr_arp_slave = bond_first_slave_rcu(bond); 3749 if (!curr_arp_slave) 3750 return should_notify_rtnl; 3751 } 3752 3753 bond_for_each_slave_rcu(bond, slave, iter) { 3754 if (!found && !before && bond_slave_is_up(slave)) 3755 before = slave; 3756 3757 if (found && !new_slave && bond_slave_is_up(slave)) 3758 new_slave = slave; 3759 /* if the link state is up at this point, we 3760 * mark it down - this can happen if we have 3761 * simultaneous link failures and 3762 * reselect_active_interface doesn't make this 3763 * one the current slave so it is still marked 3764 * up when it is actually down 3765 */ 3766 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3767 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3768 BOND_SLAVE_NOTIFY_LATER); 3769 if (slave->link_failure_count < UINT_MAX) 3770 slave->link_failure_count++; 3771 3772 bond_set_slave_inactive_flags(slave, 3773 BOND_SLAVE_NOTIFY_LATER); 3774 3775 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3776 } 3777 if (slave == curr_arp_slave) 3778 found = true; 3779 } 3780 3781 if (!new_slave && before) 3782 new_slave = before; 3783 3784 if (!new_slave) 3785 goto check_state; 3786 3787 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3788 BOND_SLAVE_NOTIFY_LATER); 3789 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3790 bond_send_validate(bond, new_slave); 3791 new_slave->last_link_up = jiffies; 3792 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3793 3794 check_state: 3795 bond_for_each_slave_rcu(bond, slave, iter) { 3796 if (slave->should_notify || slave->should_notify_link) { 3797 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3798 break; 3799 } 3800 } 3801 return should_notify_rtnl; 3802 } 3803 3804 static void bond_activebackup_arp_mon(struct bonding *bond) 3805 { 3806 bool should_notify_peers = false; 3807 bool should_notify_rtnl = false; 3808 int delta_in_ticks; 3809 3810 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3811 3812 if (!bond_has_slaves(bond)) 3813 goto re_arm; 3814 3815 rcu_read_lock(); 3816 3817 should_notify_peers = bond_should_notify_peers(bond); 3818 3819 if (bond_ab_arp_inspect(bond)) { 3820 rcu_read_unlock(); 3821 3822 /* Race avoidance with bond_close flush of workqueue */ 3823 if (!rtnl_trylock()) { 3824 delta_in_ticks = 1; 3825 should_notify_peers = false; 3826 goto re_arm; 3827 } 3828 3829 bond_ab_arp_commit(bond); 3830 3831 rtnl_unlock(); 3832 rcu_read_lock(); 3833 } 3834 3835 should_notify_rtnl = bond_ab_arp_probe(bond); 3836 rcu_read_unlock(); 3837 3838 re_arm: 3839 if (bond->params.arp_interval) 3840 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3841 3842 if (should_notify_peers || should_notify_rtnl) { 3843 if (!rtnl_trylock()) 3844 return; 3845 3846 if (should_notify_peers) { 3847 bond->send_peer_notif--; 3848 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3849 bond->dev); 3850 } 3851 if (should_notify_rtnl) { 3852 bond_slave_state_notify(bond); 3853 bond_slave_link_notify(bond); 3854 } 3855 3856 rtnl_unlock(); 3857 } 3858 } 3859 3860 static void bond_arp_monitor(struct work_struct *work) 3861 { 3862 struct bonding *bond = container_of(work, struct bonding, 3863 arp_work.work); 3864 3865 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3866 bond_activebackup_arp_mon(bond); 3867 else 3868 bond_loadbalance_arp_mon(bond); 3869 } 3870 3871 /*-------------------------- netdev event handling --------------------------*/ 3872 3873 /* Change device name */ 3874 static int bond_event_changename(struct bonding *bond) 3875 { 3876 bond_remove_proc_entry(bond); 3877 bond_create_proc_entry(bond); 3878 3879 bond_debug_reregister(bond); 3880 3881 return NOTIFY_DONE; 3882 } 3883 3884 static int bond_master_netdev_event(unsigned long event, 3885 struct net_device *bond_dev) 3886 { 3887 struct bonding *event_bond = netdev_priv(bond_dev); 3888 3889 netdev_dbg(bond_dev, "%s called\n", __func__); 3890 3891 switch (event) { 3892 case NETDEV_CHANGENAME: 3893 return bond_event_changename(event_bond); 3894 case NETDEV_UNREGISTER: 3895 bond_remove_proc_entry(event_bond); 3896 #ifdef CONFIG_XFRM_OFFLOAD 3897 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3898 #endif /* CONFIG_XFRM_OFFLOAD */ 3899 break; 3900 case NETDEV_REGISTER: 3901 bond_create_proc_entry(event_bond); 3902 break; 3903 default: 3904 break; 3905 } 3906 3907 return NOTIFY_DONE; 3908 } 3909 3910 static int bond_slave_netdev_event(unsigned long event, 3911 struct net_device *slave_dev) 3912 { 3913 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 3914 struct bonding *bond; 3915 struct net_device *bond_dev; 3916 3917 /* A netdev event can be generated while enslaving a device 3918 * before netdev_rx_handler_register is called in which case 3919 * slave will be NULL 3920 */ 3921 if (!slave) { 3922 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 3923 return NOTIFY_DONE; 3924 } 3925 3926 bond_dev = slave->bond->dev; 3927 bond = slave->bond; 3928 primary = rtnl_dereference(bond->primary_slave); 3929 3930 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 3931 3932 switch (event) { 3933 case NETDEV_UNREGISTER: 3934 if (bond_dev->type != ARPHRD_ETHER) 3935 bond_release_and_destroy(bond_dev, slave_dev); 3936 else 3937 __bond_release_one(bond_dev, slave_dev, false, true); 3938 break; 3939 case NETDEV_UP: 3940 case NETDEV_CHANGE: 3941 /* For 802.3ad mode only: 3942 * Getting invalid Speed/Duplex values here will put slave 3943 * in weird state. Mark it as link-fail if the link was 3944 * previously up or link-down if it hasn't yet come up, and 3945 * let link-monitoring (miimon) set it right when correct 3946 * speeds/duplex are available. 3947 */ 3948 if (bond_update_speed_duplex(slave) && 3949 BOND_MODE(bond) == BOND_MODE_8023AD) { 3950 if (slave->last_link_up) 3951 slave->link = BOND_LINK_FAIL; 3952 else 3953 slave->link = BOND_LINK_DOWN; 3954 } 3955 3956 if (BOND_MODE(bond) == BOND_MODE_8023AD) 3957 bond_3ad_adapter_speed_duplex_changed(slave); 3958 fallthrough; 3959 case NETDEV_DOWN: 3960 /* Refresh slave-array if applicable! 3961 * If the setup does not use miimon or arpmon (mode-specific!), 3962 * then these events will not cause the slave-array to be 3963 * refreshed. This will cause xmit to use a slave that is not 3964 * usable. Avoid such situation by refeshing the array at these 3965 * events. If these (miimon/arpmon) parameters are configured 3966 * then array gets refreshed twice and that should be fine! 3967 */ 3968 if (bond_mode_can_use_xmit_hash(bond)) 3969 bond_update_slave_arr(bond, NULL); 3970 break; 3971 case NETDEV_CHANGEMTU: 3972 /* TODO: Should slaves be allowed to 3973 * independently alter their MTU? For 3974 * an active-backup bond, slaves need 3975 * not be the same type of device, so 3976 * MTUs may vary. For other modes, 3977 * slaves arguably should have the 3978 * same MTUs. To do this, we'd need to 3979 * take over the slave's change_mtu 3980 * function for the duration of their 3981 * servitude. 3982 */ 3983 break; 3984 case NETDEV_CHANGENAME: 3985 /* we don't care if we don't have primary set */ 3986 if (!bond_uses_primary(bond) || 3987 !bond->params.primary[0]) 3988 break; 3989 3990 if (slave == primary) { 3991 /* slave's name changed - he's no longer primary */ 3992 RCU_INIT_POINTER(bond->primary_slave, NULL); 3993 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 3994 /* we have a new primary slave */ 3995 rcu_assign_pointer(bond->primary_slave, slave); 3996 } else { /* we didn't change primary - exit */ 3997 break; 3998 } 3999 4000 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 4001 primary ? slave_dev->name : "none"); 4002 4003 block_netpoll_tx(); 4004 bond_select_active_slave(bond); 4005 unblock_netpoll_tx(); 4006 break; 4007 case NETDEV_FEAT_CHANGE: 4008 if (!bond->notifier_ctx) { 4009 bond->notifier_ctx = true; 4010 bond_compute_features(bond); 4011 bond->notifier_ctx = false; 4012 } 4013 break; 4014 case NETDEV_RESEND_IGMP: 4015 /* Propagate to master device */ 4016 call_netdevice_notifiers(event, slave->bond->dev); 4017 break; 4018 case NETDEV_XDP_FEAT_CHANGE: 4019 bond_xdp_set_features(bond_dev); 4020 break; 4021 default: 4022 break; 4023 } 4024 4025 return NOTIFY_DONE; 4026 } 4027 4028 /* bond_netdev_event: handle netdev notifier chain events. 4029 * 4030 * This function receives events for the netdev chain. The caller (an 4031 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 4032 * locks for us to safely manipulate the slave devices (RTNL lock, 4033 * dev_probe_lock). 4034 */ 4035 static int bond_netdev_event(struct notifier_block *this, 4036 unsigned long event, void *ptr) 4037 { 4038 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 4039 4040 netdev_dbg(event_dev, "%s received %s\n", 4041 __func__, netdev_cmd_to_name(event)); 4042 4043 if (!(event_dev->priv_flags & IFF_BONDING)) 4044 return NOTIFY_DONE; 4045 4046 if (event_dev->flags & IFF_MASTER) { 4047 int ret; 4048 4049 ret = bond_master_netdev_event(event, event_dev); 4050 if (ret != NOTIFY_DONE) 4051 return ret; 4052 } 4053 4054 if (event_dev->flags & IFF_SLAVE) 4055 return bond_slave_netdev_event(event, event_dev); 4056 4057 return NOTIFY_DONE; 4058 } 4059 4060 static struct notifier_block bond_netdev_notifier = { 4061 .notifier_call = bond_netdev_event, 4062 }; 4063 4064 /*---------------------------- Hashing Policies -----------------------------*/ 4065 4066 /* Helper to access data in a packet, with or without a backing skb. 4067 * If skb is given the data is linearized if necessary via pskb_may_pull. 4068 */ 4069 static inline const void *bond_pull_data(struct sk_buff *skb, 4070 const void *data, int hlen, int n) 4071 { 4072 if (likely(n <= hlen)) 4073 return data; 4074 else if (skb && likely(pskb_may_pull(skb, n))) 4075 return skb->data; 4076 4077 return NULL; 4078 } 4079 4080 /* L2 hash helper */ 4081 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4082 { 4083 struct ethhdr *ep; 4084 4085 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4086 if (!data) 4087 return 0; 4088 4089 ep = (struct ethhdr *)(data + mhoff); 4090 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 4091 } 4092 4093 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 4094 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 4095 { 4096 const struct ipv6hdr *iph6; 4097 const struct iphdr *iph; 4098 4099 if (l2_proto == htons(ETH_P_IP)) { 4100 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 4101 if (!data) 4102 return false; 4103 4104 iph = (const struct iphdr *)(data + *nhoff); 4105 iph_to_flow_copy_v4addrs(fk, iph); 4106 *nhoff += iph->ihl << 2; 4107 if (!ip_is_fragment(iph)) 4108 *ip_proto = iph->protocol; 4109 } else if (l2_proto == htons(ETH_P_IPV6)) { 4110 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 4111 if (!data) 4112 return false; 4113 4114 iph6 = (const struct ipv6hdr *)(data + *nhoff); 4115 iph_to_flow_copy_v6addrs(fk, iph6); 4116 *nhoff += sizeof(*iph6); 4117 *ip_proto = iph6->nexthdr; 4118 } else { 4119 return false; 4120 } 4121 4122 if (l34 && *ip_proto >= 0) 4123 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 4124 4125 return true; 4126 } 4127 4128 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4129 { 4130 u32 srcmac_vendor = 0, srcmac_dev = 0; 4131 struct ethhdr *mac_hdr; 4132 u16 vlan = 0; 4133 int i; 4134 4135 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4136 if (!data) 4137 return 0; 4138 mac_hdr = (struct ethhdr *)(data + mhoff); 4139 4140 for (i = 0; i < 3; i++) 4141 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4142 4143 for (i = 3; i < ETH_ALEN; i++) 4144 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4145 4146 if (skb && skb_vlan_tag_present(skb)) 4147 vlan = skb_vlan_tag_get(skb); 4148 4149 return vlan ^ srcmac_vendor ^ srcmac_dev; 4150 } 4151 4152 /* Extract the appropriate headers based on bond's xmit policy */ 4153 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4154 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4155 { 4156 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4157 int ip_proto = -1; 4158 4159 switch (bond->params.xmit_policy) { 4160 case BOND_XMIT_POLICY_ENCAP23: 4161 case BOND_XMIT_POLICY_ENCAP34: 4162 memset(fk, 0, sizeof(*fk)); 4163 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4164 fk, data, l2_proto, nhoff, hlen, 0); 4165 default: 4166 break; 4167 } 4168 4169 fk->ports.ports = 0; 4170 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4171 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4172 return false; 4173 4174 /* ICMP error packets contains at least 8 bytes of the header 4175 * of the packet which generated the error. Use this information 4176 * to correlate ICMP error packets within the same flow which 4177 * generated the error. 4178 */ 4179 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4180 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4181 if (ip_proto == IPPROTO_ICMP) { 4182 if (!icmp_is_err(fk->icmp.type)) 4183 return true; 4184 4185 nhoff += sizeof(struct icmphdr); 4186 } else if (ip_proto == IPPROTO_ICMPV6) { 4187 if (!icmpv6_is_err(fk->icmp.type)) 4188 return true; 4189 4190 nhoff += sizeof(struct icmp6hdr); 4191 } 4192 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4193 } 4194 4195 return true; 4196 } 4197 4198 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4199 { 4200 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4201 (__force u32)flow_get_u32_src(flow); 4202 hash ^= (hash >> 16); 4203 hash ^= (hash >> 8); 4204 4205 /* discard lowest hash bit to deal with the common even ports pattern */ 4206 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4207 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4208 return hash >> 1; 4209 4210 return hash; 4211 } 4212 4213 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4214 * the data as required, but this function can be used without it if the data is 4215 * known to be linear (e.g. with xdp_buff). 4216 */ 4217 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4218 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4219 { 4220 struct flow_keys flow; 4221 u32 hash; 4222 4223 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4224 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4225 4226 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4227 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4228 return bond_eth_hash(skb, data, mhoff, hlen); 4229 4230 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4231 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4232 hash = bond_eth_hash(skb, data, mhoff, hlen); 4233 } else { 4234 if (flow.icmp.id) 4235 memcpy(&hash, &flow.icmp, sizeof(hash)); 4236 else 4237 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4238 } 4239 4240 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4241 } 4242 4243 /** 4244 * bond_xmit_hash - generate a hash value based on the xmit policy 4245 * @bond: bonding device 4246 * @skb: buffer to use for headers 4247 * 4248 * This function will extract the necessary headers from the skb buffer and use 4249 * them to generate a hash based on the xmit_policy set in the bonding device 4250 */ 4251 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4252 { 4253 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4254 skb->l4_hash) 4255 return skb->hash; 4256 4257 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4258 0, skb_network_offset(skb), 4259 skb_headlen(skb)); 4260 } 4261 4262 /** 4263 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4264 * @bond: bonding device 4265 * @xdp: buffer to use for headers 4266 * 4267 * The XDP variant of bond_xmit_hash. 4268 */ 4269 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4270 { 4271 struct ethhdr *eth; 4272 4273 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4274 return 0; 4275 4276 eth = (struct ethhdr *)xdp->data; 4277 4278 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4279 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4280 } 4281 4282 /*-------------------------- Device entry points ----------------------------*/ 4283 4284 void bond_work_init_all(struct bonding *bond) 4285 { 4286 INIT_DELAYED_WORK(&bond->mcast_work, 4287 bond_resend_igmp_join_requests_delayed); 4288 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4289 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4290 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4291 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4292 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4293 } 4294 4295 static void bond_work_cancel_all(struct bonding *bond) 4296 { 4297 cancel_delayed_work_sync(&bond->mii_work); 4298 cancel_delayed_work_sync(&bond->arp_work); 4299 cancel_delayed_work_sync(&bond->alb_work); 4300 cancel_delayed_work_sync(&bond->ad_work); 4301 cancel_delayed_work_sync(&bond->mcast_work); 4302 cancel_delayed_work_sync(&bond->slave_arr_work); 4303 } 4304 4305 static int bond_open(struct net_device *bond_dev) 4306 { 4307 struct bonding *bond = netdev_priv(bond_dev); 4308 struct list_head *iter; 4309 struct slave *slave; 4310 4311 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { 4312 bond->rr_tx_counter = alloc_percpu(u32); 4313 if (!bond->rr_tx_counter) 4314 return -ENOMEM; 4315 } 4316 4317 /* reset slave->backup and slave->inactive */ 4318 if (bond_has_slaves(bond)) { 4319 bond_for_each_slave(bond, slave, iter) { 4320 if (bond_uses_primary(bond) && 4321 slave != rcu_access_pointer(bond->curr_active_slave)) { 4322 bond_set_slave_inactive_flags(slave, 4323 BOND_SLAVE_NOTIFY_NOW); 4324 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4325 bond_set_slave_active_flags(slave, 4326 BOND_SLAVE_NOTIFY_NOW); 4327 } 4328 } 4329 } 4330 4331 if (bond_is_lb(bond)) { 4332 /* bond_alb_initialize must be called before the timer 4333 * is started. 4334 */ 4335 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4336 return -ENOMEM; 4337 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4338 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4339 } 4340 4341 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4342 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4343 4344 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4345 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4346 bond->recv_probe = bond_rcv_validate; 4347 } 4348 4349 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4350 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4351 /* register to receive LACPDUs */ 4352 bond->recv_probe = bond_3ad_lacpdu_recv; 4353 bond_3ad_initiate_agg_selection(bond, 1); 4354 4355 bond_for_each_slave(bond, slave, iter) 4356 dev_mc_add(slave->dev, lacpdu_mcast_addr); 4357 } 4358 4359 if (bond_mode_can_use_xmit_hash(bond)) 4360 bond_update_slave_arr(bond, NULL); 4361 4362 return 0; 4363 } 4364 4365 static int bond_close(struct net_device *bond_dev) 4366 { 4367 struct bonding *bond = netdev_priv(bond_dev); 4368 struct slave *slave; 4369 4370 bond_work_cancel_all(bond); 4371 bond->send_peer_notif = 0; 4372 if (bond_is_lb(bond)) 4373 bond_alb_deinitialize(bond); 4374 bond->recv_probe = NULL; 4375 4376 if (bond_uses_primary(bond)) { 4377 rcu_read_lock(); 4378 slave = rcu_dereference(bond->curr_active_slave); 4379 if (slave) 4380 bond_hw_addr_flush(bond_dev, slave->dev); 4381 rcu_read_unlock(); 4382 } else { 4383 struct list_head *iter; 4384 4385 bond_for_each_slave(bond, slave, iter) 4386 bond_hw_addr_flush(bond_dev, slave->dev); 4387 } 4388 4389 return 0; 4390 } 4391 4392 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4393 * that some drivers can provide 32bit values only. 4394 */ 4395 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4396 const struct rtnl_link_stats64 *_new, 4397 const struct rtnl_link_stats64 *_old) 4398 { 4399 const u64 *new = (const u64 *)_new; 4400 const u64 *old = (const u64 *)_old; 4401 u64 *res = (u64 *)_res; 4402 int i; 4403 4404 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4405 u64 nv = new[i]; 4406 u64 ov = old[i]; 4407 s64 delta = nv - ov; 4408 4409 /* detects if this particular field is 32bit only */ 4410 if (((nv | ov) >> 32) == 0) 4411 delta = (s64)(s32)((u32)nv - (u32)ov); 4412 4413 /* filter anomalies, some drivers reset their stats 4414 * at down/up events. 4415 */ 4416 if (delta > 0) 4417 res[i] += delta; 4418 } 4419 } 4420 4421 #ifdef CONFIG_LOCKDEP 4422 static int bond_get_lowest_level_rcu(struct net_device *dev) 4423 { 4424 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4425 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4426 int cur = 0, max = 0; 4427 4428 now = dev; 4429 iter = &dev->adj_list.lower; 4430 4431 while (1) { 4432 next = NULL; 4433 while (1) { 4434 ldev = netdev_next_lower_dev_rcu(now, &iter); 4435 if (!ldev) 4436 break; 4437 4438 next = ldev; 4439 niter = &ldev->adj_list.lower; 4440 dev_stack[cur] = now; 4441 iter_stack[cur++] = iter; 4442 if (max <= cur) 4443 max = cur; 4444 break; 4445 } 4446 4447 if (!next) { 4448 if (!cur) 4449 return max; 4450 next = dev_stack[--cur]; 4451 niter = iter_stack[cur]; 4452 } 4453 4454 now = next; 4455 iter = niter; 4456 } 4457 4458 return max; 4459 } 4460 #endif 4461 4462 static void bond_get_stats(struct net_device *bond_dev, 4463 struct rtnl_link_stats64 *stats) 4464 { 4465 struct bonding *bond = netdev_priv(bond_dev); 4466 struct rtnl_link_stats64 temp; 4467 struct list_head *iter; 4468 struct slave *slave; 4469 int nest_level = 0; 4470 4471 4472 rcu_read_lock(); 4473 #ifdef CONFIG_LOCKDEP 4474 nest_level = bond_get_lowest_level_rcu(bond_dev); 4475 #endif 4476 4477 spin_lock_nested(&bond->stats_lock, nest_level); 4478 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4479 4480 bond_for_each_slave_rcu(bond, slave, iter) { 4481 const struct rtnl_link_stats64 *new = 4482 dev_get_stats(slave->dev, &temp); 4483 4484 bond_fold_stats(stats, new, &slave->slave_stats); 4485 4486 /* save off the slave stats for the next run */ 4487 memcpy(&slave->slave_stats, new, sizeof(*new)); 4488 } 4489 4490 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4491 spin_unlock(&bond->stats_lock); 4492 rcu_read_unlock(); 4493 } 4494 4495 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4496 { 4497 struct bonding *bond = netdev_priv(bond_dev); 4498 struct mii_ioctl_data *mii = NULL; 4499 4500 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4501 4502 switch (cmd) { 4503 case SIOCGMIIPHY: 4504 mii = if_mii(ifr); 4505 if (!mii) 4506 return -EINVAL; 4507 4508 mii->phy_id = 0; 4509 fallthrough; 4510 case SIOCGMIIREG: 4511 /* We do this again just in case we were called by SIOCGMIIREG 4512 * instead of SIOCGMIIPHY. 4513 */ 4514 mii = if_mii(ifr); 4515 if (!mii) 4516 return -EINVAL; 4517 4518 if (mii->reg_num == 1) { 4519 mii->val_out = 0; 4520 if (netif_carrier_ok(bond->dev)) 4521 mii->val_out = BMSR_LSTATUS; 4522 } 4523 4524 break; 4525 default: 4526 return -EOPNOTSUPP; 4527 } 4528 4529 return 0; 4530 } 4531 4532 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4533 { 4534 struct bonding *bond = netdev_priv(bond_dev); 4535 struct net_device *slave_dev = NULL; 4536 struct ifbond k_binfo; 4537 struct ifbond __user *u_binfo = NULL; 4538 struct ifslave k_sinfo; 4539 struct ifslave __user *u_sinfo = NULL; 4540 struct bond_opt_value newval; 4541 struct net *net; 4542 int res = 0; 4543 4544 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4545 4546 switch (cmd) { 4547 case SIOCBONDINFOQUERY: 4548 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4549 4550 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4551 return -EFAULT; 4552 4553 bond_info_query(bond_dev, &k_binfo); 4554 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4555 return -EFAULT; 4556 4557 return 0; 4558 case SIOCBONDSLAVEINFOQUERY: 4559 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4560 4561 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4562 return -EFAULT; 4563 4564 res = bond_slave_info_query(bond_dev, &k_sinfo); 4565 if (res == 0 && 4566 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4567 return -EFAULT; 4568 4569 return res; 4570 default: 4571 break; 4572 } 4573 4574 net = dev_net(bond_dev); 4575 4576 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4577 return -EPERM; 4578 4579 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4580 4581 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4582 4583 if (!slave_dev) 4584 return -ENODEV; 4585 4586 switch (cmd) { 4587 case SIOCBONDENSLAVE: 4588 res = bond_enslave(bond_dev, slave_dev, NULL); 4589 break; 4590 case SIOCBONDRELEASE: 4591 res = bond_release(bond_dev, slave_dev); 4592 break; 4593 case SIOCBONDSETHWADDR: 4594 res = bond_set_dev_addr(bond_dev, slave_dev); 4595 break; 4596 case SIOCBONDCHANGEACTIVE: 4597 bond_opt_initstr(&newval, slave_dev->name); 4598 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4599 &newval); 4600 break; 4601 default: 4602 res = -EOPNOTSUPP; 4603 } 4604 4605 return res; 4606 } 4607 4608 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4609 void __user *data, int cmd) 4610 { 4611 struct ifreq ifrdata = { .ifr_data = data }; 4612 4613 switch (cmd) { 4614 case BOND_INFO_QUERY_OLD: 4615 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4616 case BOND_SLAVE_INFO_QUERY_OLD: 4617 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4618 case BOND_ENSLAVE_OLD: 4619 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4620 case BOND_RELEASE_OLD: 4621 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4622 case BOND_SETHWADDR_OLD: 4623 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4624 case BOND_CHANGE_ACTIVE_OLD: 4625 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4626 } 4627 4628 return -EOPNOTSUPP; 4629 } 4630 4631 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4632 { 4633 struct bonding *bond = netdev_priv(bond_dev); 4634 4635 if (change & IFF_PROMISC) 4636 bond_set_promiscuity(bond, 4637 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4638 4639 if (change & IFF_ALLMULTI) 4640 bond_set_allmulti(bond, 4641 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4642 } 4643 4644 static void bond_set_rx_mode(struct net_device *bond_dev) 4645 { 4646 struct bonding *bond = netdev_priv(bond_dev); 4647 struct list_head *iter; 4648 struct slave *slave; 4649 4650 rcu_read_lock(); 4651 if (bond_uses_primary(bond)) { 4652 slave = rcu_dereference(bond->curr_active_slave); 4653 if (slave) { 4654 dev_uc_sync(slave->dev, bond_dev); 4655 dev_mc_sync(slave->dev, bond_dev); 4656 } 4657 } else { 4658 bond_for_each_slave_rcu(bond, slave, iter) { 4659 dev_uc_sync_multiple(slave->dev, bond_dev); 4660 dev_mc_sync_multiple(slave->dev, bond_dev); 4661 } 4662 } 4663 rcu_read_unlock(); 4664 } 4665 4666 static int bond_neigh_init(struct neighbour *n) 4667 { 4668 struct bonding *bond = netdev_priv(n->dev); 4669 const struct net_device_ops *slave_ops; 4670 struct neigh_parms parms; 4671 struct slave *slave; 4672 int ret = 0; 4673 4674 rcu_read_lock(); 4675 slave = bond_first_slave_rcu(bond); 4676 if (!slave) 4677 goto out; 4678 slave_ops = slave->dev->netdev_ops; 4679 if (!slave_ops->ndo_neigh_setup) 4680 goto out; 4681 4682 /* TODO: find another way [1] to implement this. 4683 * Passing a zeroed structure is fragile, 4684 * but at least we do not pass garbage. 4685 * 4686 * [1] One way would be that ndo_neigh_setup() never touch 4687 * struct neigh_parms, but propagate the new neigh_setup() 4688 * back to ___neigh_create() / neigh_parms_alloc() 4689 */ 4690 memset(&parms, 0, sizeof(parms)); 4691 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4692 4693 if (ret) 4694 goto out; 4695 4696 if (parms.neigh_setup) 4697 ret = parms.neigh_setup(n); 4698 out: 4699 rcu_read_unlock(); 4700 return ret; 4701 } 4702 4703 /* The bonding ndo_neigh_setup is called at init time beofre any 4704 * slave exists. So we must declare proxy setup function which will 4705 * be used at run time to resolve the actual slave neigh param setup. 4706 * 4707 * It's also called by master devices (such as vlans) to setup their 4708 * underlying devices. In that case - do nothing, we're already set up from 4709 * our init. 4710 */ 4711 static int bond_neigh_setup(struct net_device *dev, 4712 struct neigh_parms *parms) 4713 { 4714 /* modify only our neigh_parms */ 4715 if (parms->dev == dev) 4716 parms->neigh_setup = bond_neigh_init; 4717 4718 return 0; 4719 } 4720 4721 /* Change the MTU of all of a master's slaves to match the master */ 4722 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4723 { 4724 struct bonding *bond = netdev_priv(bond_dev); 4725 struct slave *slave, *rollback_slave; 4726 struct list_head *iter; 4727 int res = 0; 4728 4729 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4730 4731 bond_for_each_slave(bond, slave, iter) { 4732 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4733 slave, slave->dev->netdev_ops->ndo_change_mtu); 4734 4735 res = dev_set_mtu(slave->dev, new_mtu); 4736 4737 if (res) { 4738 /* If we failed to set the slave's mtu to the new value 4739 * we must abort the operation even in ACTIVE_BACKUP 4740 * mode, because if we allow the backup slaves to have 4741 * different mtu values than the active slave we'll 4742 * need to change their mtu when doing a failover. That 4743 * means changing their mtu from timer context, which 4744 * is probably not a good idea. 4745 */ 4746 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4747 res, new_mtu); 4748 goto unwind; 4749 } 4750 } 4751 4752 WRITE_ONCE(bond_dev->mtu, new_mtu); 4753 4754 return 0; 4755 4756 unwind: 4757 /* unwind from head to the slave that failed */ 4758 bond_for_each_slave(bond, rollback_slave, iter) { 4759 int tmp_res; 4760 4761 if (rollback_slave == slave) 4762 break; 4763 4764 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4765 if (tmp_res) 4766 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4767 tmp_res); 4768 } 4769 4770 return res; 4771 } 4772 4773 /* Change HW address 4774 * 4775 * Note that many devices must be down to change the HW address, and 4776 * downing the master releases all slaves. We can make bonds full of 4777 * bonding devices to test this, however. 4778 */ 4779 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4780 { 4781 struct bonding *bond = netdev_priv(bond_dev); 4782 struct slave *slave, *rollback_slave; 4783 struct sockaddr_storage *ss = addr, tmp_ss; 4784 struct list_head *iter; 4785 int res = 0; 4786 4787 if (BOND_MODE(bond) == BOND_MODE_ALB) 4788 return bond_alb_set_mac_address(bond_dev, addr); 4789 4790 4791 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4792 4793 /* If fail_over_mac is enabled, do nothing and return success. 4794 * Returning an error causes ifenslave to fail. 4795 */ 4796 if (bond->params.fail_over_mac && 4797 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4798 return 0; 4799 4800 if (!is_valid_ether_addr(ss->__data)) 4801 return -EADDRNOTAVAIL; 4802 4803 bond_for_each_slave(bond, slave, iter) { 4804 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4805 __func__, slave); 4806 res = dev_set_mac_address(slave->dev, addr, NULL); 4807 if (res) { 4808 /* TODO: consider downing the slave 4809 * and retry ? 4810 * User should expect communications 4811 * breakage anyway until ARP finish 4812 * updating, so... 4813 */ 4814 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4815 __func__, res); 4816 goto unwind; 4817 } 4818 } 4819 4820 /* success */ 4821 dev_addr_set(bond_dev, ss->__data); 4822 return 0; 4823 4824 unwind: 4825 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4826 tmp_ss.ss_family = bond_dev->type; 4827 4828 /* unwind from head to the slave that failed */ 4829 bond_for_each_slave(bond, rollback_slave, iter) { 4830 int tmp_res; 4831 4832 if (rollback_slave == slave) 4833 break; 4834 4835 tmp_res = dev_set_mac_address(rollback_slave->dev, 4836 (struct sockaddr *)&tmp_ss, NULL); 4837 if (tmp_res) { 4838 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4839 __func__, tmp_res); 4840 } 4841 } 4842 4843 return res; 4844 } 4845 4846 /** 4847 * bond_get_slave_by_id - get xmit slave with slave_id 4848 * @bond: bonding device that is transmitting 4849 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4850 * 4851 * This function tries to get slave with slave_id but in case 4852 * it fails, it tries to find the first available slave for transmission. 4853 */ 4854 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4855 int slave_id) 4856 { 4857 struct list_head *iter; 4858 struct slave *slave; 4859 int i = slave_id; 4860 4861 /* Here we start from the slave with slave_id */ 4862 bond_for_each_slave_rcu(bond, slave, iter) { 4863 if (--i < 0) { 4864 if (bond_slave_can_tx(slave)) 4865 return slave; 4866 } 4867 } 4868 4869 /* Here we start from the first slave up to slave_id */ 4870 i = slave_id; 4871 bond_for_each_slave_rcu(bond, slave, iter) { 4872 if (--i < 0) 4873 break; 4874 if (bond_slave_can_tx(slave)) 4875 return slave; 4876 } 4877 /* no slave that can tx has been found */ 4878 return NULL; 4879 } 4880 4881 /** 4882 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4883 * @bond: bonding device to use 4884 * 4885 * Based on the value of the bonding device's packets_per_slave parameter 4886 * this function generates a slave id, which is usually used as the next 4887 * slave to transmit through. 4888 */ 4889 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4890 { 4891 u32 slave_id; 4892 struct reciprocal_value reciprocal_packets_per_slave; 4893 int packets_per_slave = bond->params.packets_per_slave; 4894 4895 switch (packets_per_slave) { 4896 case 0: 4897 slave_id = get_random_u32(); 4898 break; 4899 case 1: 4900 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4901 break; 4902 default: 4903 reciprocal_packets_per_slave = 4904 bond->params.reciprocal_packets_per_slave; 4905 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4906 slave_id = reciprocal_divide(slave_id, 4907 reciprocal_packets_per_slave); 4908 break; 4909 } 4910 4911 return slave_id; 4912 } 4913 4914 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 4915 struct sk_buff *skb) 4916 { 4917 struct slave *slave; 4918 int slave_cnt; 4919 u32 slave_id; 4920 4921 /* Start with the curr_active_slave that joined the bond as the 4922 * default for sending IGMP traffic. For failover purposes one 4923 * needs to maintain some consistency for the interface that will 4924 * send the join/membership reports. The curr_active_slave found 4925 * will send all of this type of traffic. 4926 */ 4927 if (skb->protocol == htons(ETH_P_IP)) { 4928 int noff = skb_network_offset(skb); 4929 struct iphdr *iph; 4930 4931 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 4932 goto non_igmp; 4933 4934 iph = ip_hdr(skb); 4935 if (iph->protocol == IPPROTO_IGMP) { 4936 slave = rcu_dereference(bond->curr_active_slave); 4937 if (slave) 4938 return slave; 4939 return bond_get_slave_by_id(bond, 0); 4940 } 4941 } 4942 4943 non_igmp: 4944 slave_cnt = READ_ONCE(bond->slave_cnt); 4945 if (likely(slave_cnt)) { 4946 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4947 return bond_get_slave_by_id(bond, slave_id); 4948 } 4949 return NULL; 4950 } 4951 4952 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 4953 struct xdp_buff *xdp) 4954 { 4955 struct slave *slave; 4956 int slave_cnt; 4957 u32 slave_id; 4958 const struct ethhdr *eth; 4959 void *data = xdp->data; 4960 4961 if (data + sizeof(struct ethhdr) > xdp->data_end) 4962 goto non_igmp; 4963 4964 eth = (struct ethhdr *)data; 4965 data += sizeof(struct ethhdr); 4966 4967 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 4968 if (eth->h_proto == htons(ETH_P_IP)) { 4969 const struct iphdr *iph; 4970 4971 if (data + sizeof(struct iphdr) > xdp->data_end) 4972 goto non_igmp; 4973 4974 iph = (struct iphdr *)data; 4975 4976 if (iph->protocol == IPPROTO_IGMP) { 4977 slave = rcu_dereference(bond->curr_active_slave); 4978 if (slave) 4979 return slave; 4980 return bond_get_slave_by_id(bond, 0); 4981 } 4982 } 4983 4984 non_igmp: 4985 slave_cnt = READ_ONCE(bond->slave_cnt); 4986 if (likely(slave_cnt)) { 4987 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 4988 return bond_get_slave_by_id(bond, slave_id); 4989 } 4990 return NULL; 4991 } 4992 4993 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 4994 struct net_device *bond_dev) 4995 { 4996 struct bonding *bond = netdev_priv(bond_dev); 4997 struct slave *slave; 4998 4999 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5000 if (likely(slave)) 5001 return bond_dev_queue_xmit(bond, skb, slave->dev); 5002 5003 return bond_tx_drop(bond_dev, skb); 5004 } 5005 5006 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 5007 { 5008 return rcu_dereference(bond->curr_active_slave); 5009 } 5010 5011 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 5012 * the bond has a usable interface. 5013 */ 5014 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 5015 struct net_device *bond_dev) 5016 { 5017 struct bonding *bond = netdev_priv(bond_dev); 5018 struct slave *slave; 5019 5020 slave = bond_xmit_activebackup_slave_get(bond); 5021 if (slave) 5022 return bond_dev_queue_xmit(bond, skb, slave->dev); 5023 5024 return bond_tx_drop(bond_dev, skb); 5025 } 5026 5027 /* Use this to update slave_array when (a) it's not appropriate to update 5028 * slave_array right away (note that update_slave_array() may sleep) 5029 * and / or (b) RTNL is not held. 5030 */ 5031 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 5032 { 5033 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 5034 } 5035 5036 /* Slave array work handler. Holds only RTNL */ 5037 static void bond_slave_arr_handler(struct work_struct *work) 5038 { 5039 struct bonding *bond = container_of(work, struct bonding, 5040 slave_arr_work.work); 5041 int ret; 5042 5043 if (!rtnl_trylock()) 5044 goto err; 5045 5046 ret = bond_update_slave_arr(bond, NULL); 5047 rtnl_unlock(); 5048 if (ret) { 5049 pr_warn_ratelimited("Failed to update slave array from WT\n"); 5050 goto err; 5051 } 5052 return; 5053 5054 err: 5055 bond_slave_arr_work_rearm(bond, 1); 5056 } 5057 5058 static void bond_skip_slave(struct bond_up_slave *slaves, 5059 struct slave *skipslave) 5060 { 5061 int idx; 5062 5063 /* Rare situation where caller has asked to skip a specific 5064 * slave but allocation failed (most likely!). BTW this is 5065 * only possible when the call is initiated from 5066 * __bond_release_one(). In this situation; overwrite the 5067 * skipslave entry in the array with the last entry from the 5068 * array to avoid a situation where the xmit path may choose 5069 * this to-be-skipped slave to send a packet out. 5070 */ 5071 for (idx = 0; slaves && idx < slaves->count; idx++) { 5072 if (skipslave == slaves->arr[idx]) { 5073 slaves->arr[idx] = 5074 slaves->arr[slaves->count - 1]; 5075 slaves->count--; 5076 break; 5077 } 5078 } 5079 } 5080 5081 static void bond_set_slave_arr(struct bonding *bond, 5082 struct bond_up_slave *usable_slaves, 5083 struct bond_up_slave *all_slaves) 5084 { 5085 struct bond_up_slave *usable, *all; 5086 5087 usable = rtnl_dereference(bond->usable_slaves); 5088 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 5089 kfree_rcu(usable, rcu); 5090 5091 all = rtnl_dereference(bond->all_slaves); 5092 rcu_assign_pointer(bond->all_slaves, all_slaves); 5093 kfree_rcu(all, rcu); 5094 } 5095 5096 static void bond_reset_slave_arr(struct bonding *bond) 5097 { 5098 bond_set_slave_arr(bond, NULL, NULL); 5099 } 5100 5101 /* Build the usable slaves array in control path for modes that use xmit-hash 5102 * to determine the slave interface - 5103 * (a) BOND_MODE_8023AD 5104 * (b) BOND_MODE_XOR 5105 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5106 * 5107 * The caller is expected to hold RTNL only and NO other lock! 5108 */ 5109 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5110 { 5111 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5112 struct slave *slave; 5113 struct list_head *iter; 5114 int agg_id = 0; 5115 int ret = 0; 5116 5117 might_sleep(); 5118 5119 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5120 bond->slave_cnt), GFP_KERNEL); 5121 all_slaves = kzalloc(struct_size(all_slaves, arr, 5122 bond->slave_cnt), GFP_KERNEL); 5123 if (!usable_slaves || !all_slaves) { 5124 ret = -ENOMEM; 5125 goto out; 5126 } 5127 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5128 struct ad_info ad_info; 5129 5130 spin_lock_bh(&bond->mode_lock); 5131 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5132 spin_unlock_bh(&bond->mode_lock); 5133 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5134 /* No active aggragator means it's not safe to use 5135 * the previous array. 5136 */ 5137 bond_reset_slave_arr(bond); 5138 goto out; 5139 } 5140 spin_unlock_bh(&bond->mode_lock); 5141 agg_id = ad_info.aggregator_id; 5142 } 5143 bond_for_each_slave(bond, slave, iter) { 5144 if (skipslave == slave) 5145 continue; 5146 5147 all_slaves->arr[all_slaves->count++] = slave; 5148 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5149 struct aggregator *agg; 5150 5151 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5152 if (!agg || agg->aggregator_identifier != agg_id) 5153 continue; 5154 } 5155 if (!bond_slave_can_tx(slave)) 5156 continue; 5157 5158 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5159 usable_slaves->count); 5160 5161 usable_slaves->arr[usable_slaves->count++] = slave; 5162 } 5163 5164 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5165 return ret; 5166 out: 5167 if (ret != 0 && skipslave) { 5168 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5169 skipslave); 5170 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5171 skipslave); 5172 } 5173 kfree_rcu(all_slaves, rcu); 5174 kfree_rcu(usable_slaves, rcu); 5175 5176 return ret; 5177 } 5178 5179 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5180 struct sk_buff *skb, 5181 struct bond_up_slave *slaves) 5182 { 5183 struct slave *slave; 5184 unsigned int count; 5185 u32 hash; 5186 5187 hash = bond_xmit_hash(bond, skb); 5188 count = slaves ? READ_ONCE(slaves->count) : 0; 5189 if (unlikely(!count)) 5190 return NULL; 5191 5192 slave = slaves->arr[hash % count]; 5193 return slave; 5194 } 5195 5196 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5197 struct xdp_buff *xdp) 5198 { 5199 struct bond_up_slave *slaves; 5200 unsigned int count; 5201 u32 hash; 5202 5203 hash = bond_xmit_hash_xdp(bond, xdp); 5204 slaves = rcu_dereference(bond->usable_slaves); 5205 count = slaves ? READ_ONCE(slaves->count) : 0; 5206 if (unlikely(!count)) 5207 return NULL; 5208 5209 return slaves->arr[hash % count]; 5210 } 5211 5212 /* Use this Xmit function for 3AD as well as XOR modes. The current 5213 * usable slave array is formed in the control path. The xmit function 5214 * just calculates hash and sends the packet out. 5215 */ 5216 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5217 struct net_device *dev) 5218 { 5219 struct bonding *bond = netdev_priv(dev); 5220 struct bond_up_slave *slaves; 5221 struct slave *slave; 5222 5223 slaves = rcu_dereference(bond->usable_slaves); 5224 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5225 if (likely(slave)) 5226 return bond_dev_queue_xmit(bond, skb, slave->dev); 5227 5228 return bond_tx_drop(dev, skb); 5229 } 5230 5231 /* in broadcast mode, we send everything to all usable interfaces. */ 5232 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5233 struct net_device *bond_dev) 5234 { 5235 struct bonding *bond = netdev_priv(bond_dev); 5236 struct slave *slave = NULL; 5237 struct list_head *iter; 5238 bool xmit_suc = false; 5239 bool skb_used = false; 5240 5241 bond_for_each_slave_rcu(bond, slave, iter) { 5242 struct sk_buff *skb2; 5243 5244 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5245 continue; 5246 5247 if (bond_is_last_slave(bond, slave)) { 5248 skb2 = skb; 5249 skb_used = true; 5250 } else { 5251 skb2 = skb_clone(skb, GFP_ATOMIC); 5252 if (!skb2) { 5253 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5254 bond_dev->name, __func__); 5255 continue; 5256 } 5257 } 5258 5259 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5260 xmit_suc = true; 5261 } 5262 5263 if (!skb_used) 5264 dev_kfree_skb_any(skb); 5265 5266 if (xmit_suc) 5267 return NETDEV_TX_OK; 5268 5269 dev_core_stats_tx_dropped_inc(bond_dev); 5270 return NET_XMIT_DROP; 5271 } 5272 5273 /*------------------------- Device initialization ---------------------------*/ 5274 5275 /* Lookup the slave that corresponds to a qid */ 5276 static inline int bond_slave_override(struct bonding *bond, 5277 struct sk_buff *skb) 5278 { 5279 struct slave *slave = NULL; 5280 struct list_head *iter; 5281 5282 if (!skb_rx_queue_recorded(skb)) 5283 return 1; 5284 5285 /* Find out if any slaves have the same mapping as this skb. */ 5286 bond_for_each_slave_rcu(bond, slave, iter) { 5287 if (READ_ONCE(slave->queue_id) == skb_get_queue_mapping(skb)) { 5288 if (bond_slave_is_up(slave) && 5289 slave->link == BOND_LINK_UP) { 5290 bond_dev_queue_xmit(bond, skb, slave->dev); 5291 return 0; 5292 } 5293 /* If the slave isn't UP, use default transmit policy. */ 5294 break; 5295 } 5296 } 5297 5298 return 1; 5299 } 5300 5301 5302 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5303 struct net_device *sb_dev) 5304 { 5305 /* This helper function exists to help dev_pick_tx get the correct 5306 * destination queue. Using a helper function skips a call to 5307 * skb_tx_hash and will put the skbs in the queue we expect on their 5308 * way down to the bonding driver. 5309 */ 5310 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5311 5312 /* Save the original txq to restore before passing to the driver */ 5313 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5314 5315 if (unlikely(txq >= dev->real_num_tx_queues)) { 5316 do { 5317 txq -= dev->real_num_tx_queues; 5318 } while (txq >= dev->real_num_tx_queues); 5319 } 5320 return txq; 5321 } 5322 5323 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5324 struct sk_buff *skb, 5325 bool all_slaves) 5326 { 5327 struct bonding *bond = netdev_priv(master_dev); 5328 struct bond_up_slave *slaves; 5329 struct slave *slave = NULL; 5330 5331 switch (BOND_MODE(bond)) { 5332 case BOND_MODE_ROUNDROBIN: 5333 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5334 break; 5335 case BOND_MODE_ACTIVEBACKUP: 5336 slave = bond_xmit_activebackup_slave_get(bond); 5337 break; 5338 case BOND_MODE_8023AD: 5339 case BOND_MODE_XOR: 5340 if (all_slaves) 5341 slaves = rcu_dereference(bond->all_slaves); 5342 else 5343 slaves = rcu_dereference(bond->usable_slaves); 5344 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5345 break; 5346 case BOND_MODE_BROADCAST: 5347 break; 5348 case BOND_MODE_ALB: 5349 slave = bond_xmit_alb_slave_get(bond, skb); 5350 break; 5351 case BOND_MODE_TLB: 5352 slave = bond_xmit_tlb_slave_get(bond, skb); 5353 break; 5354 default: 5355 /* Should never happen, mode already checked */ 5356 WARN_ONCE(true, "Unknown bonding mode"); 5357 break; 5358 } 5359 5360 if (slave) 5361 return slave->dev; 5362 return NULL; 5363 } 5364 5365 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5366 { 5367 switch (sk->sk_family) { 5368 #if IS_ENABLED(CONFIG_IPV6) 5369 case AF_INET6: 5370 if (ipv6_only_sock(sk) || 5371 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5372 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5373 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5374 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5375 break; 5376 } 5377 fallthrough; 5378 #endif 5379 default: /* AF_INET */ 5380 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5381 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5382 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5383 break; 5384 } 5385 5386 flow->ports.src = inet_sk(sk)->inet_sport; 5387 flow->ports.dst = inet_sk(sk)->inet_dport; 5388 } 5389 5390 /** 5391 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5392 * @sk: socket to use for headers 5393 * 5394 * This function will extract the necessary field from the socket and use 5395 * them to generate a hash based on the LAYER34 xmit_policy. 5396 * Assumes that sk is a TCP or UDP socket. 5397 */ 5398 static u32 bond_sk_hash_l34(struct sock *sk) 5399 { 5400 struct flow_keys flow; 5401 u32 hash; 5402 5403 bond_sk_to_flow(sk, &flow); 5404 5405 /* L4 */ 5406 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5407 /* L3 */ 5408 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5409 } 5410 5411 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5412 struct sock *sk) 5413 { 5414 struct bond_up_slave *slaves; 5415 struct slave *slave; 5416 unsigned int count; 5417 u32 hash; 5418 5419 slaves = rcu_dereference(bond->usable_slaves); 5420 count = slaves ? READ_ONCE(slaves->count) : 0; 5421 if (unlikely(!count)) 5422 return NULL; 5423 5424 hash = bond_sk_hash_l34(sk); 5425 slave = slaves->arr[hash % count]; 5426 5427 return slave->dev; 5428 } 5429 5430 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5431 struct sock *sk) 5432 { 5433 struct bonding *bond = netdev_priv(dev); 5434 struct net_device *lower = NULL; 5435 5436 rcu_read_lock(); 5437 if (bond_sk_check(bond)) 5438 lower = __bond_sk_get_lower_dev(bond, sk); 5439 rcu_read_unlock(); 5440 5441 return lower; 5442 } 5443 5444 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5445 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5446 struct net_device *dev) 5447 { 5448 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5449 5450 /* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded 5451 * was true, if tls_device_down is running in parallel, but it's OK, 5452 * because bond_get_slave_by_dev has a NULL check. 5453 */ 5454 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5455 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5456 return bond_tx_drop(dev, skb); 5457 } 5458 #endif 5459 5460 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5461 { 5462 struct bonding *bond = netdev_priv(dev); 5463 5464 if (bond_should_override_tx_queue(bond) && 5465 !bond_slave_override(bond, skb)) 5466 return NETDEV_TX_OK; 5467 5468 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5469 if (tls_is_skb_tx_device_offloaded(skb)) 5470 return bond_tls_device_xmit(bond, skb, dev); 5471 #endif 5472 5473 switch (BOND_MODE(bond)) { 5474 case BOND_MODE_ROUNDROBIN: 5475 return bond_xmit_roundrobin(skb, dev); 5476 case BOND_MODE_ACTIVEBACKUP: 5477 return bond_xmit_activebackup(skb, dev); 5478 case BOND_MODE_8023AD: 5479 case BOND_MODE_XOR: 5480 return bond_3ad_xor_xmit(skb, dev); 5481 case BOND_MODE_BROADCAST: 5482 return bond_xmit_broadcast(skb, dev); 5483 case BOND_MODE_ALB: 5484 return bond_alb_xmit(skb, dev); 5485 case BOND_MODE_TLB: 5486 return bond_tlb_xmit(skb, dev); 5487 default: 5488 /* Should never happen, mode already checked */ 5489 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5490 WARN_ON_ONCE(1); 5491 return bond_tx_drop(dev, skb); 5492 } 5493 } 5494 5495 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5496 { 5497 struct bonding *bond = netdev_priv(dev); 5498 netdev_tx_t ret = NETDEV_TX_OK; 5499 5500 /* If we risk deadlock from transmitting this in the 5501 * netpoll path, tell netpoll to queue the frame for later tx 5502 */ 5503 if (unlikely(is_netpoll_tx_blocked(dev))) 5504 return NETDEV_TX_BUSY; 5505 5506 rcu_read_lock(); 5507 if (bond_has_slaves(bond)) 5508 ret = __bond_start_xmit(skb, dev); 5509 else 5510 ret = bond_tx_drop(dev, skb); 5511 rcu_read_unlock(); 5512 5513 return ret; 5514 } 5515 5516 static struct net_device * 5517 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5518 { 5519 struct bonding *bond = netdev_priv(bond_dev); 5520 struct slave *slave; 5521 5522 /* Caller needs to hold rcu_read_lock() */ 5523 5524 switch (BOND_MODE(bond)) { 5525 case BOND_MODE_ROUNDROBIN: 5526 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5527 break; 5528 5529 case BOND_MODE_ACTIVEBACKUP: 5530 slave = bond_xmit_activebackup_slave_get(bond); 5531 break; 5532 5533 case BOND_MODE_8023AD: 5534 case BOND_MODE_XOR: 5535 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5536 break; 5537 5538 default: 5539 /* Should never happen. Mode guarded by bond_xdp_check() */ 5540 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); 5541 WARN_ON_ONCE(1); 5542 return NULL; 5543 } 5544 5545 if (slave) 5546 return slave->dev; 5547 5548 return NULL; 5549 } 5550 5551 static int bond_xdp_xmit(struct net_device *bond_dev, 5552 int n, struct xdp_frame **frames, u32 flags) 5553 { 5554 int nxmit, err = -ENXIO; 5555 5556 rcu_read_lock(); 5557 5558 for (nxmit = 0; nxmit < n; nxmit++) { 5559 struct xdp_frame *frame = frames[nxmit]; 5560 struct xdp_frame *frames1[] = {frame}; 5561 struct net_device *slave_dev; 5562 struct xdp_buff xdp; 5563 5564 xdp_convert_frame_to_buff(frame, &xdp); 5565 5566 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5567 if (!slave_dev) { 5568 err = -ENXIO; 5569 break; 5570 } 5571 5572 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5573 if (err < 1) 5574 break; 5575 } 5576 5577 rcu_read_unlock(); 5578 5579 /* If error happened on the first frame then we can pass the error up, otherwise 5580 * report the number of frames that were xmitted. 5581 */ 5582 if (err < 0) 5583 return (nxmit == 0 ? err : nxmit); 5584 5585 return nxmit; 5586 } 5587 5588 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5589 struct netlink_ext_ack *extack) 5590 { 5591 struct bonding *bond = netdev_priv(dev); 5592 struct list_head *iter; 5593 struct slave *slave, *rollback_slave; 5594 struct bpf_prog *old_prog; 5595 struct netdev_bpf xdp = { 5596 .command = XDP_SETUP_PROG, 5597 .flags = 0, 5598 .prog = prog, 5599 .extack = extack, 5600 }; 5601 int err; 5602 5603 ASSERT_RTNL(); 5604 5605 if (!bond_xdp_check(bond)) 5606 return -EOPNOTSUPP; 5607 5608 old_prog = bond->xdp_prog; 5609 bond->xdp_prog = prog; 5610 5611 bond_for_each_slave(bond, slave, iter) { 5612 struct net_device *slave_dev = slave->dev; 5613 5614 if (!slave_dev->netdev_ops->ndo_bpf || 5615 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5616 SLAVE_NL_ERR(dev, slave_dev, extack, 5617 "Slave device does not support XDP"); 5618 err = -EOPNOTSUPP; 5619 goto err; 5620 } 5621 5622 if (dev_xdp_prog_count(slave_dev) > 0) { 5623 SLAVE_NL_ERR(dev, slave_dev, extack, 5624 "Slave has XDP program loaded, please unload before enslaving"); 5625 err = -EOPNOTSUPP; 5626 goto err; 5627 } 5628 5629 err = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5630 if (err < 0) { 5631 /* ndo_bpf() sets extack error message */ 5632 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5633 goto err; 5634 } 5635 if (prog) 5636 bpf_prog_inc(prog); 5637 } 5638 5639 if (prog) { 5640 static_branch_inc(&bpf_master_redirect_enabled_key); 5641 } else if (old_prog) { 5642 bpf_prog_put(old_prog); 5643 static_branch_dec(&bpf_master_redirect_enabled_key); 5644 } 5645 5646 return 0; 5647 5648 err: 5649 /* unwind the program changes */ 5650 bond->xdp_prog = old_prog; 5651 xdp.prog = old_prog; 5652 xdp.extack = NULL; /* do not overwrite original error */ 5653 5654 bond_for_each_slave(bond, rollback_slave, iter) { 5655 struct net_device *slave_dev = rollback_slave->dev; 5656 int err_unwind; 5657 5658 if (slave == rollback_slave) 5659 break; 5660 5661 err_unwind = slave_dev->netdev_ops->ndo_bpf(slave_dev, &xdp); 5662 if (err_unwind < 0) 5663 slave_err(dev, slave_dev, 5664 "Error %d when unwinding XDP program change\n", err_unwind); 5665 else if (xdp.prog) 5666 bpf_prog_inc(xdp.prog); 5667 } 5668 return err; 5669 } 5670 5671 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5672 { 5673 switch (xdp->command) { 5674 case XDP_SETUP_PROG: 5675 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5676 default: 5677 return -EINVAL; 5678 } 5679 } 5680 5681 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5682 { 5683 if (speed == 0 || speed == SPEED_UNKNOWN) 5684 speed = slave->speed; 5685 else 5686 speed = min(speed, slave->speed); 5687 5688 return speed; 5689 } 5690 5691 /* Set the BOND_PHC_INDEX flag to notify user space */ 5692 static int bond_set_phc_index_flag(struct kernel_hwtstamp_config *kernel_cfg) 5693 { 5694 struct ifreq *ifr = kernel_cfg->ifr; 5695 struct hwtstamp_config cfg; 5696 5697 if (kernel_cfg->copied_to_user) { 5698 /* Lower device has a legacy implementation */ 5699 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 5700 return -EFAULT; 5701 5702 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 5703 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg))) 5704 return -EFAULT; 5705 } else { 5706 kernel_cfg->flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 5707 } 5708 5709 return 0; 5710 } 5711 5712 static int bond_hwtstamp_get(struct net_device *dev, 5713 struct kernel_hwtstamp_config *cfg) 5714 { 5715 struct bonding *bond = netdev_priv(dev); 5716 struct net_device *real_dev; 5717 int err; 5718 5719 real_dev = bond_option_active_slave_get_rcu(bond); 5720 if (!real_dev) 5721 return -EOPNOTSUPP; 5722 5723 err = generic_hwtstamp_get_lower(real_dev, cfg); 5724 if (err) 5725 return err; 5726 5727 return bond_set_phc_index_flag(cfg); 5728 } 5729 5730 static int bond_hwtstamp_set(struct net_device *dev, 5731 struct kernel_hwtstamp_config *cfg, 5732 struct netlink_ext_ack *extack) 5733 { 5734 struct bonding *bond = netdev_priv(dev); 5735 struct net_device *real_dev; 5736 int err; 5737 5738 if (!(cfg->flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 5739 return -EOPNOTSUPP; 5740 5741 real_dev = bond_option_active_slave_get_rcu(bond); 5742 if (!real_dev) 5743 return -EOPNOTSUPP; 5744 5745 err = generic_hwtstamp_set_lower(real_dev, cfg, extack); 5746 if (err) 5747 return err; 5748 5749 return bond_set_phc_index_flag(cfg); 5750 } 5751 5752 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5753 struct ethtool_link_ksettings *cmd) 5754 { 5755 struct bonding *bond = netdev_priv(bond_dev); 5756 struct list_head *iter; 5757 struct slave *slave; 5758 u32 speed = 0; 5759 5760 cmd->base.duplex = DUPLEX_UNKNOWN; 5761 cmd->base.port = PORT_OTHER; 5762 5763 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5764 * do not need to check mode. Though link speed might not represent 5765 * the true receive or transmit bandwidth (not all modes are symmetric) 5766 * this is an accurate maximum. 5767 */ 5768 bond_for_each_slave(bond, slave, iter) { 5769 if (bond_slave_can_tx(slave)) { 5770 bond_update_speed_duplex(slave); 5771 if (slave->speed != SPEED_UNKNOWN) { 5772 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5773 speed = bond_mode_bcast_speed(slave, 5774 speed); 5775 else 5776 speed += slave->speed; 5777 } 5778 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5779 slave->duplex != DUPLEX_UNKNOWN) 5780 cmd->base.duplex = slave->duplex; 5781 } 5782 } 5783 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5784 5785 return 0; 5786 } 5787 5788 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5789 struct ethtool_drvinfo *drvinfo) 5790 { 5791 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5792 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5793 BOND_ABI_VERSION); 5794 } 5795 5796 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5797 struct kernel_ethtool_ts_info *info) 5798 { 5799 struct bonding *bond = netdev_priv(bond_dev); 5800 struct kernel_ethtool_ts_info ts_info; 5801 struct net_device *real_dev; 5802 bool sw_tx_support = false; 5803 struct list_head *iter; 5804 struct slave *slave; 5805 int ret = 0; 5806 5807 rcu_read_lock(); 5808 real_dev = bond_option_active_slave_get_rcu(bond); 5809 dev_hold(real_dev); 5810 rcu_read_unlock(); 5811 5812 if (real_dev) { 5813 ret = ethtool_get_ts_info_by_layer(real_dev, info); 5814 } else { 5815 info->phc_index = -1; 5816 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE | 5817 SOF_TIMESTAMPING_SOFTWARE; 5818 /* Check if all slaves support software tx timestamping */ 5819 rcu_read_lock(); 5820 bond_for_each_slave_rcu(bond, slave, iter) { 5821 ret = ethtool_get_ts_info_by_layer(slave->dev, &ts_info); 5822 if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) { 5823 sw_tx_support = true; 5824 continue; 5825 } 5826 5827 sw_tx_support = false; 5828 break; 5829 } 5830 rcu_read_unlock(); 5831 } 5832 5833 if (sw_tx_support) 5834 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE; 5835 5836 dev_put(real_dev); 5837 return ret; 5838 } 5839 5840 static const struct ethtool_ops bond_ethtool_ops = { 5841 .get_drvinfo = bond_ethtool_get_drvinfo, 5842 .get_link = ethtool_op_get_link, 5843 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5844 .get_ts_info = bond_ethtool_get_ts_info, 5845 }; 5846 5847 static const struct net_device_ops bond_netdev_ops = { 5848 .ndo_init = bond_init, 5849 .ndo_uninit = bond_uninit, 5850 .ndo_open = bond_open, 5851 .ndo_stop = bond_close, 5852 .ndo_start_xmit = bond_start_xmit, 5853 .ndo_select_queue = bond_select_queue, 5854 .ndo_get_stats64 = bond_get_stats, 5855 .ndo_eth_ioctl = bond_eth_ioctl, 5856 .ndo_siocbond = bond_do_ioctl, 5857 .ndo_siocdevprivate = bond_siocdevprivate, 5858 .ndo_change_rx_flags = bond_change_rx_flags, 5859 .ndo_set_rx_mode = bond_set_rx_mode, 5860 .ndo_change_mtu = bond_change_mtu, 5861 .ndo_set_mac_address = bond_set_mac_address, 5862 .ndo_neigh_setup = bond_neigh_setup, 5863 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5864 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5865 #ifdef CONFIG_NET_POLL_CONTROLLER 5866 .ndo_netpoll_setup = bond_netpoll_setup, 5867 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5868 .ndo_poll_controller = bond_poll_controller, 5869 #endif 5870 .ndo_add_slave = bond_enslave, 5871 .ndo_del_slave = bond_release, 5872 .ndo_fix_features = bond_fix_features, 5873 .ndo_features_check = passthru_features_check, 5874 .ndo_get_xmit_slave = bond_xmit_get_slave, 5875 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5876 .ndo_bpf = bond_xdp, 5877 .ndo_xdp_xmit = bond_xdp_xmit, 5878 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5879 .ndo_hwtstamp_get = bond_hwtstamp_get, 5880 .ndo_hwtstamp_set = bond_hwtstamp_set, 5881 }; 5882 5883 static const struct device_type bond_type = { 5884 .name = "bond", 5885 }; 5886 5887 static void bond_destructor(struct net_device *bond_dev) 5888 { 5889 struct bonding *bond = netdev_priv(bond_dev); 5890 5891 if (bond->wq) 5892 destroy_workqueue(bond->wq); 5893 5894 free_percpu(bond->rr_tx_counter); 5895 } 5896 5897 void bond_setup(struct net_device *bond_dev) 5898 { 5899 struct bonding *bond = netdev_priv(bond_dev); 5900 5901 spin_lock_init(&bond->mode_lock); 5902 bond->params = bonding_defaults; 5903 5904 /* Initialize pointers */ 5905 bond->dev = bond_dev; 5906 5907 /* Initialize the device entry points */ 5908 ether_setup(bond_dev); 5909 bond_dev->max_mtu = ETH_MAX_MTU; 5910 bond_dev->netdev_ops = &bond_netdev_ops; 5911 bond_dev->ethtool_ops = &bond_ethtool_ops; 5912 5913 bond_dev->needs_free_netdev = true; 5914 bond_dev->priv_destructor = bond_destructor; 5915 5916 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 5917 5918 /* Initialize the device options */ 5919 bond_dev->flags |= IFF_MASTER; 5920 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 5921 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 5922 5923 #ifdef CONFIG_XFRM_OFFLOAD 5924 /* set up xfrm device ops (only supported in active-backup right now) */ 5925 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 5926 INIT_LIST_HEAD(&bond->ipsec_list); 5927 mutex_init(&bond->ipsec_lock); 5928 #endif /* CONFIG_XFRM_OFFLOAD */ 5929 5930 /* don't acquire bond device's netif_tx_lock when transmitting */ 5931 bond_dev->features |= NETIF_F_LLTX; 5932 5933 /* By default, we declare the bond to be fully 5934 * VLAN hardware accelerated capable. Special 5935 * care is taken in the various xmit functions 5936 * when there are slaves that are not hw accel 5937 * capable 5938 */ 5939 5940 /* Don't allow bond devices to change network namespaces. */ 5941 bond_dev->features |= NETIF_F_NETNS_LOCAL; 5942 5943 bond_dev->hw_features = BOND_VLAN_FEATURES | 5944 NETIF_F_HW_VLAN_CTAG_RX | 5945 NETIF_F_HW_VLAN_CTAG_FILTER | 5946 NETIF_F_HW_VLAN_STAG_RX | 5947 NETIF_F_HW_VLAN_STAG_FILTER; 5948 5949 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 5950 bond_dev->features |= bond_dev->hw_features; 5951 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 5952 #ifdef CONFIG_XFRM_OFFLOAD 5953 bond_dev->hw_features |= BOND_XFRM_FEATURES; 5954 /* Only enable XFRM features if this is an active-backup config */ 5955 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 5956 bond_dev->features |= BOND_XFRM_FEATURES; 5957 #endif /* CONFIG_XFRM_OFFLOAD */ 5958 } 5959 5960 /* Destroy a bonding device. 5961 * Must be under rtnl_lock when this function is called. 5962 */ 5963 static void bond_uninit(struct net_device *bond_dev) 5964 { 5965 struct bonding *bond = netdev_priv(bond_dev); 5966 struct list_head *iter; 5967 struct slave *slave; 5968 5969 bond_netpoll_cleanup(bond_dev); 5970 5971 /* Release the bonded slaves */ 5972 bond_for_each_slave(bond, slave, iter) 5973 __bond_release_one(bond_dev, slave->dev, true, true); 5974 netdev_info(bond_dev, "Released all slaves\n"); 5975 5976 #ifdef CONFIG_XFRM_OFFLOAD 5977 mutex_destroy(&bond->ipsec_lock); 5978 #endif /* CONFIG_XFRM_OFFLOAD */ 5979 5980 bond_set_slave_arr(bond, NULL, NULL); 5981 5982 list_del_rcu(&bond->bond_list); 5983 5984 bond_debug_unregister(bond); 5985 } 5986 5987 /*------------------------- Module initialization ---------------------------*/ 5988 5989 static int __init bond_check_params(struct bond_params *params) 5990 { 5991 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 5992 struct bond_opt_value newval; 5993 const struct bond_opt_value *valptr; 5994 int arp_all_targets_value = 0; 5995 u16 ad_actor_sys_prio = 0; 5996 u16 ad_user_port_key = 0; 5997 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 5998 int arp_ip_count; 5999 int bond_mode = BOND_MODE_ROUNDROBIN; 6000 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 6001 int lacp_fast = 0; 6002 int tlb_dynamic_lb; 6003 6004 /* Convert string parameters. */ 6005 if (mode) { 6006 bond_opt_initstr(&newval, mode); 6007 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 6008 if (!valptr) { 6009 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 6010 return -EINVAL; 6011 } 6012 bond_mode = valptr->value; 6013 } 6014 6015 if (xmit_hash_policy) { 6016 if (bond_mode == BOND_MODE_ROUNDROBIN || 6017 bond_mode == BOND_MODE_ACTIVEBACKUP || 6018 bond_mode == BOND_MODE_BROADCAST) { 6019 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 6020 bond_mode_name(bond_mode)); 6021 } else { 6022 bond_opt_initstr(&newval, xmit_hash_policy); 6023 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 6024 &newval); 6025 if (!valptr) { 6026 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 6027 xmit_hash_policy); 6028 return -EINVAL; 6029 } 6030 xmit_hashtype = valptr->value; 6031 } 6032 } 6033 6034 if (lacp_rate) { 6035 if (bond_mode != BOND_MODE_8023AD) { 6036 pr_info("lacp_rate param is irrelevant in mode %s\n", 6037 bond_mode_name(bond_mode)); 6038 } else { 6039 bond_opt_initstr(&newval, lacp_rate); 6040 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 6041 &newval); 6042 if (!valptr) { 6043 pr_err("Error: Invalid lacp rate \"%s\"\n", 6044 lacp_rate); 6045 return -EINVAL; 6046 } 6047 lacp_fast = valptr->value; 6048 } 6049 } 6050 6051 if (ad_select) { 6052 bond_opt_initstr(&newval, ad_select); 6053 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 6054 &newval); 6055 if (!valptr) { 6056 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 6057 return -EINVAL; 6058 } 6059 params->ad_select = valptr->value; 6060 if (bond_mode != BOND_MODE_8023AD) 6061 pr_warn("ad_select param only affects 802.3ad mode\n"); 6062 } else { 6063 params->ad_select = BOND_AD_STABLE; 6064 } 6065 6066 if (max_bonds < 0) { 6067 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 6068 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 6069 max_bonds = BOND_DEFAULT_MAX_BONDS; 6070 } 6071 6072 if (miimon < 0) { 6073 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6074 miimon, INT_MAX); 6075 miimon = 0; 6076 } 6077 6078 if (updelay < 0) { 6079 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6080 updelay, INT_MAX); 6081 updelay = 0; 6082 } 6083 6084 if (downdelay < 0) { 6085 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6086 downdelay, INT_MAX); 6087 downdelay = 0; 6088 } 6089 6090 if ((use_carrier != 0) && (use_carrier != 1)) { 6091 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 6092 use_carrier); 6093 use_carrier = 1; 6094 } 6095 6096 if (num_peer_notif < 0 || num_peer_notif > 255) { 6097 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 6098 num_peer_notif); 6099 num_peer_notif = 1; 6100 } 6101 6102 /* reset values for 802.3ad/TLB/ALB */ 6103 if (!bond_mode_uses_arp(bond_mode)) { 6104 if (!miimon) { 6105 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"); 6106 pr_warn("Forcing miimon to 100msec\n"); 6107 miimon = BOND_DEFAULT_MIIMON; 6108 } 6109 } 6110 6111 if (tx_queues < 1 || tx_queues > 255) { 6112 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 6113 tx_queues, BOND_DEFAULT_TX_QUEUES); 6114 tx_queues = BOND_DEFAULT_TX_QUEUES; 6115 } 6116 6117 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 6118 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 6119 all_slaves_active); 6120 all_slaves_active = 0; 6121 } 6122 6123 if (resend_igmp < 0 || resend_igmp > 255) { 6124 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 6125 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 6126 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 6127 } 6128 6129 bond_opt_initval(&newval, packets_per_slave); 6130 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 6131 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 6132 packets_per_slave, USHRT_MAX); 6133 packets_per_slave = 1; 6134 } 6135 6136 if (bond_mode == BOND_MODE_ALB) { 6137 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", 6138 updelay); 6139 } 6140 6141 if (!miimon) { 6142 if (updelay || downdelay) { 6143 /* just warn the user the up/down delay will have 6144 * no effect since miimon is zero... 6145 */ 6146 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", 6147 updelay, downdelay); 6148 } 6149 } else { 6150 /* don't allow arp monitoring */ 6151 if (arp_interval) { 6152 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 6153 miimon, arp_interval); 6154 arp_interval = 0; 6155 } 6156 6157 if ((updelay % miimon) != 0) { 6158 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6159 updelay, miimon, (updelay / miimon) * miimon); 6160 } 6161 6162 updelay /= miimon; 6163 6164 if ((downdelay % miimon) != 0) { 6165 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6166 downdelay, miimon, 6167 (downdelay / miimon) * miimon); 6168 } 6169 6170 downdelay /= miimon; 6171 } 6172 6173 if (arp_interval < 0) { 6174 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6175 arp_interval, INT_MAX); 6176 arp_interval = 0; 6177 } 6178 6179 for (arp_ip_count = 0, i = 0; 6180 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6181 __be32 ip; 6182 6183 /* not a complete check, but good enough to catch mistakes */ 6184 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6185 !bond_is_ip_target_ok(ip)) { 6186 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6187 arp_ip_target[i]); 6188 arp_interval = 0; 6189 } else { 6190 if (bond_get_targets_ip(arp_target, ip) == -1) 6191 arp_target[arp_ip_count++] = ip; 6192 else 6193 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6194 &ip); 6195 } 6196 } 6197 6198 if (arp_interval && !arp_ip_count) { 6199 /* don't allow arping if no arp_ip_target given... */ 6200 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6201 arp_interval); 6202 arp_interval = 0; 6203 } 6204 6205 if (arp_validate) { 6206 if (!arp_interval) { 6207 pr_err("arp_validate requires arp_interval\n"); 6208 return -EINVAL; 6209 } 6210 6211 bond_opt_initstr(&newval, arp_validate); 6212 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6213 &newval); 6214 if (!valptr) { 6215 pr_err("Error: invalid arp_validate \"%s\"\n", 6216 arp_validate); 6217 return -EINVAL; 6218 } 6219 arp_validate_value = valptr->value; 6220 } else { 6221 arp_validate_value = 0; 6222 } 6223 6224 if (arp_all_targets) { 6225 bond_opt_initstr(&newval, arp_all_targets); 6226 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6227 &newval); 6228 if (!valptr) { 6229 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6230 arp_all_targets); 6231 arp_all_targets_value = 0; 6232 } else { 6233 arp_all_targets_value = valptr->value; 6234 } 6235 } 6236 6237 if (miimon) { 6238 pr_info("MII link monitoring set to %d ms\n", miimon); 6239 } else if (arp_interval) { 6240 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6241 arp_validate_value); 6242 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6243 arp_interval, valptr->string, arp_ip_count); 6244 6245 for (i = 0; i < arp_ip_count; i++) 6246 pr_cont(" %s", arp_ip_target[i]); 6247 6248 pr_cont("\n"); 6249 6250 } else if (max_bonds) { 6251 /* miimon and arp_interval not set, we need one so things 6252 * work as expected, see bonding.txt for details 6253 */ 6254 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"); 6255 } 6256 6257 if (primary && !bond_mode_uses_primary(bond_mode)) { 6258 /* currently, using a primary only makes sense 6259 * in active backup, TLB or ALB modes 6260 */ 6261 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6262 primary, bond_mode_name(bond_mode)); 6263 primary = NULL; 6264 } 6265 6266 if (primary && primary_reselect) { 6267 bond_opt_initstr(&newval, primary_reselect); 6268 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6269 &newval); 6270 if (!valptr) { 6271 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6272 primary_reselect); 6273 return -EINVAL; 6274 } 6275 primary_reselect_value = valptr->value; 6276 } else { 6277 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6278 } 6279 6280 if (fail_over_mac) { 6281 bond_opt_initstr(&newval, fail_over_mac); 6282 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6283 &newval); 6284 if (!valptr) { 6285 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6286 fail_over_mac); 6287 return -EINVAL; 6288 } 6289 fail_over_mac_value = valptr->value; 6290 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6291 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6292 } else { 6293 fail_over_mac_value = BOND_FOM_NONE; 6294 } 6295 6296 bond_opt_initstr(&newval, "default"); 6297 valptr = bond_opt_parse( 6298 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6299 &newval); 6300 if (!valptr) { 6301 pr_err("Error: No ad_actor_sys_prio default value"); 6302 return -EINVAL; 6303 } 6304 ad_actor_sys_prio = valptr->value; 6305 6306 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6307 &newval); 6308 if (!valptr) { 6309 pr_err("Error: No ad_user_port_key default value"); 6310 return -EINVAL; 6311 } 6312 ad_user_port_key = valptr->value; 6313 6314 bond_opt_initstr(&newval, "default"); 6315 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6316 if (!valptr) { 6317 pr_err("Error: No tlb_dynamic_lb default value"); 6318 return -EINVAL; 6319 } 6320 tlb_dynamic_lb = valptr->value; 6321 6322 if (lp_interval == 0) { 6323 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6324 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6325 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6326 } 6327 6328 /* fill params struct with the proper values */ 6329 params->mode = bond_mode; 6330 params->xmit_policy = xmit_hashtype; 6331 params->miimon = miimon; 6332 params->num_peer_notif = num_peer_notif; 6333 params->arp_interval = arp_interval; 6334 params->arp_validate = arp_validate_value; 6335 params->arp_all_targets = arp_all_targets_value; 6336 params->missed_max = 2; 6337 params->updelay = updelay; 6338 params->downdelay = downdelay; 6339 params->peer_notif_delay = 0; 6340 params->use_carrier = use_carrier; 6341 params->lacp_active = 1; 6342 params->lacp_fast = lacp_fast; 6343 params->primary[0] = 0; 6344 params->primary_reselect = primary_reselect_value; 6345 params->fail_over_mac = fail_over_mac_value; 6346 params->tx_queues = tx_queues; 6347 params->all_slaves_active = all_slaves_active; 6348 params->resend_igmp = resend_igmp; 6349 params->min_links = min_links; 6350 params->lp_interval = lp_interval; 6351 params->packets_per_slave = packets_per_slave; 6352 params->tlb_dynamic_lb = tlb_dynamic_lb; 6353 params->ad_actor_sys_prio = ad_actor_sys_prio; 6354 eth_zero_addr(params->ad_actor_system); 6355 params->ad_user_port_key = ad_user_port_key; 6356 params->coupled_control = 1; 6357 if (packets_per_slave > 0) { 6358 params->reciprocal_packets_per_slave = 6359 reciprocal_value(packets_per_slave); 6360 } else { 6361 /* reciprocal_packets_per_slave is unused if 6362 * packets_per_slave is 0 or 1, just initialize it 6363 */ 6364 params->reciprocal_packets_per_slave = 6365 (struct reciprocal_value) { 0 }; 6366 } 6367 6368 if (primary) 6369 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6370 6371 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6372 #if IS_ENABLED(CONFIG_IPV6) 6373 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6374 #endif 6375 6376 return 0; 6377 } 6378 6379 /* Called from registration process */ 6380 static int bond_init(struct net_device *bond_dev) 6381 { 6382 struct bonding *bond = netdev_priv(bond_dev); 6383 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6384 6385 netdev_dbg(bond_dev, "Begin bond_init\n"); 6386 6387 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM); 6388 if (!bond->wq) 6389 return -ENOMEM; 6390 6391 bond->notifier_ctx = false; 6392 6393 spin_lock_init(&bond->stats_lock); 6394 netdev_lockdep_set_classes(bond_dev); 6395 6396 list_add_tail_rcu(&bond->bond_list, &bn->dev_list); 6397 6398 bond_prepare_sysfs_group(bond); 6399 6400 bond_debug_register(bond); 6401 6402 /* Ensure valid dev_addr */ 6403 if (is_zero_ether_addr(bond_dev->dev_addr) && 6404 bond_dev->addr_assign_type == NET_ADDR_PERM) 6405 eth_hw_addr_random(bond_dev); 6406 6407 return 0; 6408 } 6409 6410 unsigned int bond_get_num_tx_queues(void) 6411 { 6412 return tx_queues; 6413 } 6414 6415 /* Create a new bond based on the specified name and bonding parameters. 6416 * If name is NULL, obtain a suitable "bond%d" name for us. 6417 * Caller must NOT hold rtnl_lock; we need to release it here before we 6418 * set up our sysfs entries. 6419 */ 6420 int bond_create(struct net *net, const char *name) 6421 { 6422 struct net_device *bond_dev; 6423 struct bonding *bond; 6424 int res = -ENOMEM; 6425 6426 rtnl_lock(); 6427 6428 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6429 name ? name : "bond%d", NET_NAME_UNKNOWN, 6430 bond_setup, tx_queues); 6431 if (!bond_dev) 6432 goto out; 6433 6434 bond = netdev_priv(bond_dev); 6435 dev_net_set(bond_dev, net); 6436 bond_dev->rtnl_link_ops = &bond_link_ops; 6437 6438 res = register_netdevice(bond_dev); 6439 if (res < 0) { 6440 free_netdev(bond_dev); 6441 goto out; 6442 } 6443 6444 netif_carrier_off(bond_dev); 6445 6446 bond_work_init_all(bond); 6447 6448 out: 6449 rtnl_unlock(); 6450 return res; 6451 } 6452 6453 static int __net_init bond_net_init(struct net *net) 6454 { 6455 struct bond_net *bn = net_generic(net, bond_net_id); 6456 6457 bn->net = net; 6458 INIT_LIST_HEAD(&bn->dev_list); 6459 6460 bond_create_proc_dir(bn); 6461 bond_create_sysfs(bn); 6462 6463 return 0; 6464 } 6465 6466 /* According to commit 69b0216ac255 ("bonding: fix bonding_masters 6467 * race condition in bond unloading") we need to remove sysfs files 6468 * before we remove our devices (done later in bond_net_exit_batch_rtnl()) 6469 */ 6470 static void __net_exit bond_net_pre_exit(struct net *net) 6471 { 6472 struct bond_net *bn = net_generic(net, bond_net_id); 6473 6474 bond_destroy_sysfs(bn); 6475 } 6476 6477 static void __net_exit bond_net_exit_batch_rtnl(struct list_head *net_list, 6478 struct list_head *dev_kill_list) 6479 { 6480 struct bond_net *bn; 6481 struct net *net; 6482 6483 /* Kill off any bonds created after unregistering bond rtnl ops */ 6484 list_for_each_entry(net, net_list, exit_list) { 6485 struct bonding *bond, *tmp_bond; 6486 6487 bn = net_generic(net, bond_net_id); 6488 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6489 unregister_netdevice_queue(bond->dev, dev_kill_list); 6490 } 6491 } 6492 6493 /* According to commit 23fa5c2caae0 ("bonding: destroy proc directory 6494 * only after all bonds are gone") bond_destroy_proc_dir() is called 6495 * after bond_net_exit_batch_rtnl() has completed. 6496 */ 6497 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6498 { 6499 struct bond_net *bn; 6500 struct net *net; 6501 6502 list_for_each_entry(net, net_list, exit_list) { 6503 bn = net_generic(net, bond_net_id); 6504 bond_destroy_proc_dir(bn); 6505 } 6506 } 6507 6508 static struct pernet_operations bond_net_ops = { 6509 .init = bond_net_init, 6510 .pre_exit = bond_net_pre_exit, 6511 .exit_batch_rtnl = bond_net_exit_batch_rtnl, 6512 .exit_batch = bond_net_exit_batch, 6513 .id = &bond_net_id, 6514 .size = sizeof(struct bond_net), 6515 }; 6516 6517 static int __init bonding_init(void) 6518 { 6519 int i; 6520 int res; 6521 6522 res = bond_check_params(&bonding_defaults); 6523 if (res) 6524 goto out; 6525 6526 bond_create_debugfs(); 6527 6528 res = register_pernet_subsys(&bond_net_ops); 6529 if (res) 6530 goto err_net_ops; 6531 6532 res = bond_netlink_init(); 6533 if (res) 6534 goto err_link; 6535 6536 for (i = 0; i < max_bonds; i++) { 6537 res = bond_create(&init_net, NULL); 6538 if (res) 6539 goto err; 6540 } 6541 6542 skb_flow_dissector_init(&flow_keys_bonding, 6543 flow_keys_bonding_keys, 6544 ARRAY_SIZE(flow_keys_bonding_keys)); 6545 6546 register_netdevice_notifier(&bond_netdev_notifier); 6547 out: 6548 return res; 6549 err: 6550 bond_netlink_fini(); 6551 err_link: 6552 unregister_pernet_subsys(&bond_net_ops); 6553 err_net_ops: 6554 bond_destroy_debugfs(); 6555 goto out; 6556 6557 } 6558 6559 static void __exit bonding_exit(void) 6560 { 6561 unregister_netdevice_notifier(&bond_netdev_notifier); 6562 6563 bond_netlink_fini(); 6564 unregister_pernet_subsys(&bond_net_ops); 6565 6566 bond_destroy_debugfs(); 6567 6568 #ifdef CONFIG_NET_POLL_CONTROLLER 6569 /* Make sure we don't have an imbalance on our netpoll blocking */ 6570 WARN_ON(atomic_read(&netpoll_block_tx)); 6571 #endif 6572 } 6573 6574 module_init(bonding_init); 6575 module_exit(bonding_exit); 6576 MODULE_LICENSE("GPL"); 6577 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6578 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6579