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_dev - Get active device for IPsec offload 423 * @xs: pointer to transformer state struct 424 * 425 * Context: caller must hold rcu_read_lock. 426 * 427 * Return: the device for ipsec offload, or NULL if not exist. 428 **/ 429 static struct net_device *bond_ipsec_dev(struct xfrm_state *xs) 430 { 431 struct net_device *bond_dev = xs->xso.dev; 432 struct bonding *bond; 433 struct slave *slave; 434 435 if (!bond_dev) 436 return NULL; 437 438 bond = netdev_priv(bond_dev); 439 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) 440 return NULL; 441 442 slave = rcu_dereference(bond->curr_active_slave); 443 if (!slave) 444 return NULL; 445 446 if (!xs->xso.real_dev) 447 return NULL; 448 449 if (xs->xso.real_dev != slave->dev) 450 pr_warn_ratelimited("%s: (slave %s): not same with IPsec offload real dev %s\n", 451 bond_dev->name, slave->dev->name, xs->xso.real_dev->name); 452 453 return slave->dev; 454 } 455 456 /** 457 * bond_ipsec_add_sa - program device with a security association 458 * @xs: pointer to transformer state struct 459 * @extack: extack point to fill failure reason 460 **/ 461 static int bond_ipsec_add_sa(struct xfrm_state *xs, 462 struct netlink_ext_ack *extack) 463 { 464 struct net_device *bond_dev = xs->xso.dev; 465 struct net_device *real_dev; 466 netdevice_tracker tracker; 467 struct bond_ipsec *ipsec; 468 struct bonding *bond; 469 struct slave *slave; 470 int err; 471 472 if (!bond_dev) 473 return -EINVAL; 474 475 rcu_read_lock(); 476 bond = netdev_priv(bond_dev); 477 slave = rcu_dereference(bond->curr_active_slave); 478 real_dev = slave ? slave->dev : NULL; 479 netdev_hold(real_dev, &tracker, GFP_ATOMIC); 480 rcu_read_unlock(); 481 if (!real_dev) { 482 err = -ENODEV; 483 goto out; 484 } 485 486 if (!real_dev->xfrmdev_ops || 487 !real_dev->xfrmdev_ops->xdo_dev_state_add || 488 netif_is_bond_master(real_dev)) { 489 NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload"); 490 err = -EINVAL; 491 goto out; 492 } 493 494 ipsec = kmalloc(sizeof(*ipsec), GFP_KERNEL); 495 if (!ipsec) { 496 err = -ENOMEM; 497 goto out; 498 } 499 500 xs->xso.real_dev = real_dev; 501 err = real_dev->xfrmdev_ops->xdo_dev_state_add(xs, extack); 502 if (!err) { 503 ipsec->xs = xs; 504 INIT_LIST_HEAD(&ipsec->list); 505 mutex_lock(&bond->ipsec_lock); 506 list_add(&ipsec->list, &bond->ipsec_list); 507 mutex_unlock(&bond->ipsec_lock); 508 } else { 509 kfree(ipsec); 510 } 511 out: 512 netdev_put(real_dev, &tracker); 513 return err; 514 } 515 516 static void bond_ipsec_add_sa_all(struct bonding *bond) 517 { 518 struct net_device *bond_dev = bond->dev; 519 struct net_device *real_dev; 520 struct bond_ipsec *ipsec; 521 struct slave *slave; 522 523 slave = rtnl_dereference(bond->curr_active_slave); 524 real_dev = slave ? slave->dev : NULL; 525 if (!real_dev) 526 return; 527 528 mutex_lock(&bond->ipsec_lock); 529 if (!real_dev->xfrmdev_ops || 530 !real_dev->xfrmdev_ops->xdo_dev_state_add || 531 netif_is_bond_master(real_dev)) { 532 if (!list_empty(&bond->ipsec_list)) 533 slave_warn(bond_dev, real_dev, 534 "%s: no slave xdo_dev_state_add\n", 535 __func__); 536 goto out; 537 } 538 539 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 540 /* If new state is added before ipsec_lock acquired */ 541 if (ipsec->xs->xso.real_dev == real_dev) 542 continue; 543 544 ipsec->xs->xso.real_dev = real_dev; 545 if (real_dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) { 546 slave_warn(bond_dev, real_dev, "%s: failed to add SA\n", __func__); 547 ipsec->xs->xso.real_dev = NULL; 548 } 549 } 550 out: 551 mutex_unlock(&bond->ipsec_lock); 552 } 553 554 /** 555 * bond_ipsec_del_sa - clear out this specific SA 556 * @xs: pointer to transformer state struct 557 **/ 558 static void bond_ipsec_del_sa(struct xfrm_state *xs) 559 { 560 struct net_device *bond_dev = xs->xso.dev; 561 struct net_device *real_dev; 562 netdevice_tracker tracker; 563 struct bond_ipsec *ipsec; 564 struct bonding *bond; 565 struct slave *slave; 566 567 if (!bond_dev) 568 return; 569 570 rcu_read_lock(); 571 bond = netdev_priv(bond_dev); 572 slave = rcu_dereference(bond->curr_active_slave); 573 real_dev = slave ? slave->dev : NULL; 574 netdev_hold(real_dev, &tracker, GFP_ATOMIC); 575 rcu_read_unlock(); 576 577 if (!slave) 578 goto out; 579 580 if (!xs->xso.real_dev) 581 goto out; 582 583 WARN_ON(xs->xso.real_dev != real_dev); 584 585 if (!real_dev->xfrmdev_ops || 586 !real_dev->xfrmdev_ops->xdo_dev_state_delete || 587 netif_is_bond_master(real_dev)) { 588 slave_warn(bond_dev, real_dev, "%s: no slave xdo_dev_state_delete\n", __func__); 589 goto out; 590 } 591 592 real_dev->xfrmdev_ops->xdo_dev_state_delete(xs); 593 out: 594 netdev_put(real_dev, &tracker); 595 mutex_lock(&bond->ipsec_lock); 596 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 597 if (ipsec->xs == xs) { 598 list_del(&ipsec->list); 599 kfree(ipsec); 600 break; 601 } 602 } 603 mutex_unlock(&bond->ipsec_lock); 604 } 605 606 static void bond_ipsec_del_sa_all(struct bonding *bond) 607 { 608 struct net_device *bond_dev = bond->dev; 609 struct net_device *real_dev; 610 struct bond_ipsec *ipsec; 611 struct slave *slave; 612 613 slave = rtnl_dereference(bond->curr_active_slave); 614 real_dev = slave ? slave->dev : NULL; 615 if (!real_dev) 616 return; 617 618 mutex_lock(&bond->ipsec_lock); 619 list_for_each_entry(ipsec, &bond->ipsec_list, list) { 620 if (!ipsec->xs->xso.real_dev) 621 continue; 622 623 if (!real_dev->xfrmdev_ops || 624 !real_dev->xfrmdev_ops->xdo_dev_state_delete || 625 netif_is_bond_master(real_dev)) { 626 slave_warn(bond_dev, real_dev, 627 "%s: no slave xdo_dev_state_delete\n", 628 __func__); 629 } else { 630 real_dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs); 631 if (real_dev->xfrmdev_ops->xdo_dev_state_free) 632 real_dev->xfrmdev_ops->xdo_dev_state_free(ipsec->xs); 633 } 634 } 635 mutex_unlock(&bond->ipsec_lock); 636 } 637 638 static void bond_ipsec_free_sa(struct xfrm_state *xs) 639 { 640 struct net_device *bond_dev = xs->xso.dev; 641 struct net_device *real_dev; 642 netdevice_tracker tracker; 643 struct bonding *bond; 644 struct slave *slave; 645 646 if (!bond_dev) 647 return; 648 649 rcu_read_lock(); 650 bond = netdev_priv(bond_dev); 651 slave = rcu_dereference(bond->curr_active_slave); 652 real_dev = slave ? slave->dev : NULL; 653 netdev_hold(real_dev, &tracker, GFP_ATOMIC); 654 rcu_read_unlock(); 655 656 if (!slave) 657 goto out; 658 659 if (!xs->xso.real_dev) 660 goto out; 661 662 WARN_ON(xs->xso.real_dev != real_dev); 663 664 if (real_dev && real_dev->xfrmdev_ops && 665 real_dev->xfrmdev_ops->xdo_dev_state_free) 666 real_dev->xfrmdev_ops->xdo_dev_state_free(xs); 667 out: 668 netdev_put(real_dev, &tracker); 669 } 670 671 /** 672 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload 673 * @skb: current data packet 674 * @xs: pointer to transformer state struct 675 **/ 676 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) 677 { 678 struct net_device *real_dev; 679 bool ok = false; 680 681 rcu_read_lock(); 682 real_dev = bond_ipsec_dev(xs); 683 if (!real_dev) 684 goto out; 685 686 if (!real_dev->xfrmdev_ops || 687 !real_dev->xfrmdev_ops->xdo_dev_offload_ok || 688 netif_is_bond_master(real_dev)) 689 goto out; 690 691 ok = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs); 692 out: 693 rcu_read_unlock(); 694 return ok; 695 } 696 697 /** 698 * bond_advance_esn_state - ESN support for IPSec HW offload 699 * @xs: pointer to transformer state struct 700 **/ 701 static void bond_advance_esn_state(struct xfrm_state *xs) 702 { 703 struct net_device *real_dev; 704 705 rcu_read_lock(); 706 real_dev = bond_ipsec_dev(xs); 707 if (!real_dev) 708 goto out; 709 710 if (!real_dev->xfrmdev_ops || 711 !real_dev->xfrmdev_ops->xdo_dev_state_advance_esn) { 712 pr_warn_ratelimited("%s: %s doesn't support xdo_dev_state_advance_esn\n", __func__, real_dev->name); 713 goto out; 714 } 715 716 real_dev->xfrmdev_ops->xdo_dev_state_advance_esn(xs); 717 out: 718 rcu_read_unlock(); 719 } 720 721 /** 722 * bond_xfrm_update_stats - Update xfrm state 723 * @xs: pointer to transformer state struct 724 **/ 725 static void bond_xfrm_update_stats(struct xfrm_state *xs) 726 { 727 struct net_device *real_dev; 728 729 rcu_read_lock(); 730 real_dev = bond_ipsec_dev(xs); 731 if (!real_dev) 732 goto out; 733 734 if (!real_dev->xfrmdev_ops || 735 !real_dev->xfrmdev_ops->xdo_dev_state_update_stats) { 736 pr_warn_ratelimited("%s: %s doesn't support xdo_dev_state_update_stats\n", __func__, real_dev->name); 737 goto out; 738 } 739 740 real_dev->xfrmdev_ops->xdo_dev_state_update_stats(xs); 741 out: 742 rcu_read_unlock(); 743 } 744 745 static const struct xfrmdev_ops bond_xfrmdev_ops = { 746 .xdo_dev_state_add = bond_ipsec_add_sa, 747 .xdo_dev_state_delete = bond_ipsec_del_sa, 748 .xdo_dev_state_free = bond_ipsec_free_sa, 749 .xdo_dev_offload_ok = bond_ipsec_offload_ok, 750 .xdo_dev_state_advance_esn = bond_advance_esn_state, 751 .xdo_dev_state_update_stats = bond_xfrm_update_stats, 752 }; 753 #endif /* CONFIG_XFRM_OFFLOAD */ 754 755 /*------------------------------- Link status -------------------------------*/ 756 757 /* Set the carrier state for the master according to the state of its 758 * slaves. If any slaves are up, the master is up. In 802.3ad mode, 759 * do special 802.3ad magic. 760 * 761 * Returns zero if carrier state does not change, nonzero if it does. 762 */ 763 int bond_set_carrier(struct bonding *bond) 764 { 765 struct list_head *iter; 766 struct slave *slave; 767 768 if (!bond_has_slaves(bond)) 769 goto down; 770 771 if (BOND_MODE(bond) == BOND_MODE_8023AD) 772 return bond_3ad_set_carrier(bond); 773 774 bond_for_each_slave(bond, slave, iter) { 775 if (slave->link == BOND_LINK_UP) { 776 if (!netif_carrier_ok(bond->dev)) { 777 netif_carrier_on(bond->dev); 778 return 1; 779 } 780 return 0; 781 } 782 } 783 784 down: 785 if (netif_carrier_ok(bond->dev)) { 786 netif_carrier_off(bond->dev); 787 return 1; 788 } 789 return 0; 790 } 791 792 /* Get link speed and duplex from the slave's base driver 793 * using ethtool. If for some reason the call fails or the 794 * values are invalid, set speed and duplex to -1, 795 * and return. Return 1 if speed or duplex settings are 796 * UNKNOWN; 0 otherwise. 797 */ 798 static int bond_update_speed_duplex(struct slave *slave) 799 { 800 struct net_device *slave_dev = slave->dev; 801 struct ethtool_link_ksettings ecmd; 802 int res; 803 804 slave->speed = SPEED_UNKNOWN; 805 slave->duplex = DUPLEX_UNKNOWN; 806 807 res = __ethtool_get_link_ksettings(slave_dev, &ecmd); 808 if (res < 0) 809 return 1; 810 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1)) 811 return 1; 812 switch (ecmd.base.duplex) { 813 case DUPLEX_FULL: 814 case DUPLEX_HALF: 815 break; 816 default: 817 return 1; 818 } 819 820 slave->speed = ecmd.base.speed; 821 slave->duplex = ecmd.base.duplex; 822 823 return 0; 824 } 825 826 const char *bond_slave_link_status(s8 link) 827 { 828 switch (link) { 829 case BOND_LINK_UP: 830 return "up"; 831 case BOND_LINK_FAIL: 832 return "going down"; 833 case BOND_LINK_DOWN: 834 return "down"; 835 case BOND_LINK_BACK: 836 return "going back"; 837 default: 838 return "unknown"; 839 } 840 } 841 842 /* if <dev> supports MII link status reporting, check its link status. 843 * 844 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(), 845 * depending upon the setting of the use_carrier parameter. 846 * 847 * Return either BMSR_LSTATUS, meaning that the link is up (or we 848 * can't tell and just pretend it is), or 0, meaning that the link is 849 * down. 850 * 851 * If reporting is non-zero, instead of faking link up, return -1 if 852 * both ETHTOOL and MII ioctls fail (meaning the device does not 853 * support them). If use_carrier is set, return whatever it says. 854 * It'd be nice if there was a good way to tell if a driver supports 855 * netif_carrier, but there really isn't. 856 */ 857 static int bond_check_dev_link(struct bonding *bond, 858 struct net_device *slave_dev, int reporting) 859 { 860 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 861 int (*ioctl)(struct net_device *, struct ifreq *, int); 862 struct ifreq ifr; 863 struct mii_ioctl_data *mii; 864 865 if (!reporting && !netif_running(slave_dev)) 866 return 0; 867 868 if (bond->params.use_carrier) 869 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0; 870 871 /* Try to get link status using Ethtool first. */ 872 if (slave_dev->ethtool_ops->get_link) 873 return slave_dev->ethtool_ops->get_link(slave_dev) ? 874 BMSR_LSTATUS : 0; 875 876 /* Ethtool can't be used, fallback to MII ioctls. */ 877 ioctl = slave_ops->ndo_eth_ioctl; 878 if (ioctl) { 879 /* TODO: set pointer to correct ioctl on a per team member 880 * bases to make this more efficient. that is, once 881 * we determine the correct ioctl, we will always 882 * call it and not the others for that team 883 * member. 884 */ 885 886 /* We cannot assume that SIOCGMIIPHY will also read a 887 * register; not all network drivers (e.g., e100) 888 * support that. 889 */ 890 891 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */ 892 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ); 893 mii = if_mii(&ifr); 894 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) { 895 mii->reg_num = MII_BMSR; 896 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0) 897 return mii->val_out & BMSR_LSTATUS; 898 } 899 } 900 901 /* If reporting, report that either there's no ndo_eth_ioctl, 902 * or both SIOCGMIIREG and get_link failed (meaning that we 903 * cannot report link status). If not reporting, pretend 904 * we're ok. 905 */ 906 return reporting ? -1 : BMSR_LSTATUS; 907 } 908 909 /*----------------------------- Multicast list ------------------------------*/ 910 911 /* Push the promiscuity flag down to appropriate slaves */ 912 static int bond_set_promiscuity(struct bonding *bond, int inc) 913 { 914 struct list_head *iter; 915 int err = 0; 916 917 if (bond_uses_primary(bond)) { 918 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 919 920 if (curr_active) 921 err = dev_set_promiscuity(curr_active->dev, inc); 922 } else { 923 struct slave *slave; 924 925 bond_for_each_slave(bond, slave, iter) { 926 err = dev_set_promiscuity(slave->dev, inc); 927 if (err) 928 return err; 929 } 930 } 931 return err; 932 } 933 934 /* Push the allmulti flag down to all slaves */ 935 static int bond_set_allmulti(struct bonding *bond, int inc) 936 { 937 struct list_head *iter; 938 int err = 0; 939 940 if (bond_uses_primary(bond)) { 941 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); 942 943 if (curr_active) 944 err = dev_set_allmulti(curr_active->dev, inc); 945 } else { 946 struct slave *slave; 947 948 bond_for_each_slave(bond, slave, iter) { 949 err = dev_set_allmulti(slave->dev, inc); 950 if (err) 951 return err; 952 } 953 } 954 return err; 955 } 956 957 /* Retrieve the list of registered multicast addresses for the bonding 958 * device and retransmit an IGMP JOIN request to the current active 959 * slave. 960 */ 961 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work) 962 { 963 struct bonding *bond = container_of(work, struct bonding, 964 mcast_work.work); 965 966 if (!rtnl_trylock()) { 967 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 968 return; 969 } 970 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev); 971 972 if (bond->igmp_retrans > 1) { 973 bond->igmp_retrans--; 974 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5); 975 } 976 rtnl_unlock(); 977 } 978 979 /* Flush bond's hardware addresses from slave */ 980 static void bond_hw_addr_flush(struct net_device *bond_dev, 981 struct net_device *slave_dev) 982 { 983 struct bonding *bond = netdev_priv(bond_dev); 984 985 dev_uc_unsync(slave_dev, bond_dev); 986 dev_mc_unsync(slave_dev, bond_dev); 987 988 if (BOND_MODE(bond) == BOND_MODE_8023AD) 989 dev_mc_del(slave_dev, lacpdu_mcast_addr); 990 } 991 992 /*--------------------------- Active slave change ---------------------------*/ 993 994 /* Update the hardware address list and promisc/allmulti for the new and 995 * old active slaves (if any). Modes that are not using primary keep all 996 * slaves up date at all times; only the modes that use primary need to call 997 * this function to swap these settings during a failover. 998 */ 999 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active, 1000 struct slave *old_active) 1001 { 1002 if (old_active) { 1003 if (bond->dev->flags & IFF_PROMISC) 1004 dev_set_promiscuity(old_active->dev, -1); 1005 1006 if (bond->dev->flags & IFF_ALLMULTI) 1007 dev_set_allmulti(old_active->dev, -1); 1008 1009 if (bond->dev->flags & IFF_UP) 1010 bond_hw_addr_flush(bond->dev, old_active->dev); 1011 1012 bond_slave_ns_maddrs_add(bond, old_active); 1013 } 1014 1015 if (new_active) { 1016 /* FIXME: Signal errors upstream. */ 1017 if (bond->dev->flags & IFF_PROMISC) 1018 dev_set_promiscuity(new_active->dev, 1); 1019 1020 if (bond->dev->flags & IFF_ALLMULTI) 1021 dev_set_allmulti(new_active->dev, 1); 1022 1023 if (bond->dev->flags & IFF_UP) { 1024 netif_addr_lock_bh(bond->dev); 1025 dev_uc_sync(new_active->dev, bond->dev); 1026 dev_mc_sync(new_active->dev, bond->dev); 1027 netif_addr_unlock_bh(bond->dev); 1028 } 1029 1030 bond_slave_ns_maddrs_del(bond, new_active); 1031 } 1032 } 1033 1034 /** 1035 * bond_set_dev_addr - clone slave's address to bond 1036 * @bond_dev: bond net device 1037 * @slave_dev: slave net device 1038 * 1039 * Should be called with RTNL held. 1040 */ 1041 static int bond_set_dev_addr(struct net_device *bond_dev, 1042 struct net_device *slave_dev) 1043 { 1044 int err; 1045 1046 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n", 1047 bond_dev, slave_dev, slave_dev->addr_len); 1048 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL); 1049 if (err) 1050 return err; 1051 1052 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len); 1053 bond_dev->addr_assign_type = NET_ADDR_STOLEN; 1054 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev); 1055 return 0; 1056 } 1057 1058 static struct slave *bond_get_old_active(struct bonding *bond, 1059 struct slave *new_active) 1060 { 1061 struct slave *slave; 1062 struct list_head *iter; 1063 1064 bond_for_each_slave(bond, slave, iter) { 1065 if (slave == new_active) 1066 continue; 1067 1068 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr)) 1069 return slave; 1070 } 1071 1072 return NULL; 1073 } 1074 1075 /* bond_do_fail_over_mac 1076 * 1077 * Perform special MAC address swapping for fail_over_mac settings 1078 * 1079 * Called with RTNL 1080 */ 1081 static void bond_do_fail_over_mac(struct bonding *bond, 1082 struct slave *new_active, 1083 struct slave *old_active) 1084 { 1085 u8 tmp_mac[MAX_ADDR_LEN]; 1086 struct sockaddr_storage ss; 1087 int rv; 1088 1089 switch (bond->params.fail_over_mac) { 1090 case BOND_FOM_ACTIVE: 1091 if (new_active) { 1092 rv = bond_set_dev_addr(bond->dev, new_active->dev); 1093 if (rv) 1094 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n", 1095 -rv); 1096 } 1097 break; 1098 case BOND_FOM_FOLLOW: 1099 /* if new_active && old_active, swap them 1100 * if just old_active, do nothing (going to no active slave) 1101 * if just new_active, set new_active to bond's MAC 1102 */ 1103 if (!new_active) 1104 return; 1105 1106 if (!old_active) 1107 old_active = bond_get_old_active(bond, new_active); 1108 1109 if (old_active) { 1110 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr, 1111 new_active->dev->addr_len); 1112 bond_hw_addr_copy(ss.__data, 1113 old_active->dev->dev_addr, 1114 old_active->dev->addr_len); 1115 ss.ss_family = new_active->dev->type; 1116 } else { 1117 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr, 1118 bond->dev->addr_len); 1119 ss.ss_family = bond->dev->type; 1120 } 1121 1122 rv = dev_set_mac_address(new_active->dev, 1123 (struct sockaddr *)&ss, NULL); 1124 if (rv) { 1125 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n", 1126 -rv); 1127 goto out; 1128 } 1129 1130 if (!old_active) 1131 goto out; 1132 1133 bond_hw_addr_copy(ss.__data, tmp_mac, 1134 new_active->dev->addr_len); 1135 ss.ss_family = old_active->dev->type; 1136 1137 rv = dev_set_mac_address(old_active->dev, 1138 (struct sockaddr *)&ss, NULL); 1139 if (rv) 1140 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n", 1141 -rv); 1142 out: 1143 break; 1144 default: 1145 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n", 1146 bond->params.fail_over_mac); 1147 break; 1148 } 1149 1150 } 1151 1152 /** 1153 * bond_choose_primary_or_current - select the primary or high priority slave 1154 * @bond: our bonding struct 1155 * 1156 * - Check if there is a primary link. If the primary link was set and is up, 1157 * go on and do link reselection. 1158 * 1159 * - If primary link is not set or down, find the highest priority link. 1160 * If the highest priority link is not current slave, set it as primary 1161 * link and do link reselection. 1162 */ 1163 static struct slave *bond_choose_primary_or_current(struct bonding *bond) 1164 { 1165 struct slave *prim = rtnl_dereference(bond->primary_slave); 1166 struct slave *curr = rtnl_dereference(bond->curr_active_slave); 1167 struct slave *slave, *hprio = NULL; 1168 struct list_head *iter; 1169 1170 if (!prim || prim->link != BOND_LINK_UP) { 1171 bond_for_each_slave(bond, slave, iter) { 1172 if (slave->link == BOND_LINK_UP) { 1173 hprio = hprio ?: slave; 1174 if (slave->prio > hprio->prio) 1175 hprio = slave; 1176 } 1177 } 1178 1179 if (hprio && hprio != curr) { 1180 prim = hprio; 1181 goto link_reselect; 1182 } 1183 1184 if (!curr || curr->link != BOND_LINK_UP) 1185 return NULL; 1186 return curr; 1187 } 1188 1189 if (bond->force_primary) { 1190 bond->force_primary = false; 1191 return prim; 1192 } 1193 1194 link_reselect: 1195 if (!curr || curr->link != BOND_LINK_UP) 1196 return prim; 1197 1198 /* At this point, prim and curr are both up */ 1199 switch (bond->params.primary_reselect) { 1200 case BOND_PRI_RESELECT_ALWAYS: 1201 return prim; 1202 case BOND_PRI_RESELECT_BETTER: 1203 if (prim->speed < curr->speed) 1204 return curr; 1205 if (prim->speed == curr->speed && prim->duplex <= curr->duplex) 1206 return curr; 1207 return prim; 1208 case BOND_PRI_RESELECT_FAILURE: 1209 return curr; 1210 default: 1211 netdev_err(bond->dev, "impossible primary_reselect %d\n", 1212 bond->params.primary_reselect); 1213 return curr; 1214 } 1215 } 1216 1217 /** 1218 * bond_find_best_slave - select the best available slave to be the active one 1219 * @bond: our bonding struct 1220 */ 1221 static struct slave *bond_find_best_slave(struct bonding *bond) 1222 { 1223 struct slave *slave, *bestslave = NULL; 1224 struct list_head *iter; 1225 int mintime = bond->params.updelay; 1226 1227 slave = bond_choose_primary_or_current(bond); 1228 if (slave) 1229 return slave; 1230 1231 bond_for_each_slave(bond, slave, iter) { 1232 if (slave->link == BOND_LINK_UP) 1233 return slave; 1234 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) && 1235 slave->delay < mintime) { 1236 mintime = slave->delay; 1237 bestslave = slave; 1238 } 1239 } 1240 1241 return bestslave; 1242 } 1243 1244 /* must be called in RCU critical section or with RTNL held */ 1245 static bool bond_should_notify_peers(struct bonding *bond) 1246 { 1247 struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave); 1248 1249 if (!slave || !bond->send_peer_notif || 1250 bond->send_peer_notif % 1251 max(1, bond->params.peer_notif_delay) != 0 || 1252 !netif_carrier_ok(bond->dev) || 1253 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state)) 1254 return false; 1255 1256 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n", 1257 slave ? slave->dev->name : "NULL"); 1258 1259 return true; 1260 } 1261 1262 /** 1263 * bond_change_active_slave - change the active slave into the specified one 1264 * @bond: our bonding struct 1265 * @new_active: the new slave to make the active one 1266 * 1267 * Set the new slave to the bond's settings and unset them on the old 1268 * curr_active_slave. 1269 * Setting include flags, mc-list, promiscuity, allmulti, etc. 1270 * 1271 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP, 1272 * because it is apparently the best available slave we have, even though its 1273 * updelay hasn't timed out yet. 1274 * 1275 * Caller must hold RTNL. 1276 */ 1277 void bond_change_active_slave(struct bonding *bond, struct slave *new_active) 1278 { 1279 struct slave *old_active; 1280 1281 ASSERT_RTNL(); 1282 1283 old_active = rtnl_dereference(bond->curr_active_slave); 1284 1285 if (old_active == new_active) 1286 return; 1287 1288 #ifdef CONFIG_XFRM_OFFLOAD 1289 bond_ipsec_del_sa_all(bond); 1290 #endif /* CONFIG_XFRM_OFFLOAD */ 1291 1292 if (new_active) { 1293 new_active->last_link_up = jiffies; 1294 1295 if (new_active->link == BOND_LINK_BACK) { 1296 if (bond_uses_primary(bond)) { 1297 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n", 1298 (bond->params.updelay - new_active->delay) * bond->params.miimon); 1299 } 1300 1301 new_active->delay = 0; 1302 bond_set_slave_link_state(new_active, BOND_LINK_UP, 1303 BOND_SLAVE_NOTIFY_NOW); 1304 1305 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1306 bond_3ad_handle_link_change(new_active, BOND_LINK_UP); 1307 1308 if (bond_is_lb(bond)) 1309 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP); 1310 } else { 1311 if (bond_uses_primary(bond)) 1312 slave_info(bond->dev, new_active->dev, "making interface the new active one\n"); 1313 } 1314 } 1315 1316 if (bond_uses_primary(bond)) 1317 bond_hw_addr_swap(bond, new_active, old_active); 1318 1319 if (bond_is_lb(bond)) { 1320 bond_alb_handle_active_change(bond, new_active); 1321 if (old_active) 1322 bond_set_slave_inactive_flags(old_active, 1323 BOND_SLAVE_NOTIFY_NOW); 1324 if (new_active) 1325 bond_set_slave_active_flags(new_active, 1326 BOND_SLAVE_NOTIFY_NOW); 1327 } else { 1328 rcu_assign_pointer(bond->curr_active_slave, new_active); 1329 } 1330 1331 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 1332 if (old_active) 1333 bond_set_slave_inactive_flags(old_active, 1334 BOND_SLAVE_NOTIFY_NOW); 1335 1336 if (new_active) { 1337 bool should_notify_peers = false; 1338 1339 bond_set_slave_active_flags(new_active, 1340 BOND_SLAVE_NOTIFY_NOW); 1341 1342 if (bond->params.fail_over_mac) 1343 bond_do_fail_over_mac(bond, new_active, 1344 old_active); 1345 1346 if (netif_running(bond->dev)) { 1347 bond->send_peer_notif = 1348 bond->params.num_peer_notif * 1349 max(1, bond->params.peer_notif_delay); 1350 should_notify_peers = 1351 bond_should_notify_peers(bond); 1352 } 1353 1354 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev); 1355 if (should_notify_peers) { 1356 bond->send_peer_notif--; 1357 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 1358 bond->dev); 1359 } 1360 } 1361 } 1362 1363 #ifdef CONFIG_XFRM_OFFLOAD 1364 bond_ipsec_add_sa_all(bond); 1365 #endif /* CONFIG_XFRM_OFFLOAD */ 1366 1367 /* resend IGMP joins since active slave has changed or 1368 * all were sent on curr_active_slave. 1369 * resend only if bond is brought up with the affected 1370 * bonding modes and the retransmission is enabled 1371 */ 1372 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) && 1373 ((bond_uses_primary(bond) && new_active) || 1374 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) { 1375 bond->igmp_retrans = bond->params.resend_igmp; 1376 queue_delayed_work(bond->wq, &bond->mcast_work, 1); 1377 } 1378 } 1379 1380 /** 1381 * bond_select_active_slave - select a new active slave, if needed 1382 * @bond: our bonding struct 1383 * 1384 * This functions should be called when one of the following occurs: 1385 * - The old curr_active_slave has been released or lost its link. 1386 * - The primary_slave has got its link back. 1387 * - A slave has got its link back and there's no old curr_active_slave. 1388 * 1389 * Caller must hold RTNL. 1390 */ 1391 void bond_select_active_slave(struct bonding *bond) 1392 { 1393 struct slave *best_slave; 1394 int rv; 1395 1396 ASSERT_RTNL(); 1397 1398 best_slave = bond_find_best_slave(bond); 1399 if (best_slave != rtnl_dereference(bond->curr_active_slave)) { 1400 bond_change_active_slave(bond, best_slave); 1401 rv = bond_set_carrier(bond); 1402 if (!rv) 1403 return; 1404 1405 if (netif_carrier_ok(bond->dev)) 1406 netdev_info(bond->dev, "active interface up!\n"); 1407 else 1408 netdev_info(bond->dev, "now running without any active interface!\n"); 1409 } 1410 } 1411 1412 #ifdef CONFIG_NET_POLL_CONTROLLER 1413 static inline int slave_enable_netpoll(struct slave *slave) 1414 { 1415 struct netpoll *np; 1416 int err = 0; 1417 1418 np = kzalloc(sizeof(*np), GFP_KERNEL); 1419 err = -ENOMEM; 1420 if (!np) 1421 goto out; 1422 1423 err = __netpoll_setup(np, slave->dev); 1424 if (err) { 1425 kfree(np); 1426 goto out; 1427 } 1428 slave->np = np; 1429 out: 1430 return err; 1431 } 1432 static inline void slave_disable_netpoll(struct slave *slave) 1433 { 1434 struct netpoll *np = slave->np; 1435 1436 if (!np) 1437 return; 1438 1439 slave->np = NULL; 1440 1441 __netpoll_free(np); 1442 } 1443 1444 static void bond_poll_controller(struct net_device *bond_dev) 1445 { 1446 struct bonding *bond = netdev_priv(bond_dev); 1447 struct slave *slave = NULL; 1448 struct list_head *iter; 1449 struct ad_info ad_info; 1450 1451 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1452 if (bond_3ad_get_active_agg_info(bond, &ad_info)) 1453 return; 1454 1455 bond_for_each_slave_rcu(bond, slave, iter) { 1456 if (!bond_slave_is_up(slave)) 1457 continue; 1458 1459 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1460 struct aggregator *agg = 1461 SLAVE_AD_INFO(slave)->port.aggregator; 1462 1463 if (agg && 1464 agg->aggregator_identifier != ad_info.aggregator_id) 1465 continue; 1466 } 1467 1468 netpoll_poll_dev(slave->dev); 1469 } 1470 } 1471 1472 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1473 { 1474 struct bonding *bond = netdev_priv(bond_dev); 1475 struct list_head *iter; 1476 struct slave *slave; 1477 1478 bond_for_each_slave(bond, slave, iter) 1479 if (bond_slave_is_up(slave)) 1480 slave_disable_netpoll(slave); 1481 } 1482 1483 static int bond_netpoll_setup(struct net_device *dev) 1484 { 1485 struct bonding *bond = netdev_priv(dev); 1486 struct list_head *iter; 1487 struct slave *slave; 1488 int err = 0; 1489 1490 bond_for_each_slave(bond, slave, iter) { 1491 err = slave_enable_netpoll(slave); 1492 if (err) { 1493 bond_netpoll_cleanup(dev); 1494 break; 1495 } 1496 } 1497 return err; 1498 } 1499 #else 1500 static inline int slave_enable_netpoll(struct slave *slave) 1501 { 1502 return 0; 1503 } 1504 static inline void slave_disable_netpoll(struct slave *slave) 1505 { 1506 } 1507 static void bond_netpoll_cleanup(struct net_device *bond_dev) 1508 { 1509 } 1510 #endif 1511 1512 /*---------------------------------- IOCTL ----------------------------------*/ 1513 1514 static netdev_features_t bond_fix_features(struct net_device *dev, 1515 netdev_features_t features) 1516 { 1517 struct bonding *bond = netdev_priv(dev); 1518 struct list_head *iter; 1519 netdev_features_t mask; 1520 struct slave *slave; 1521 1522 mask = features; 1523 1524 features &= ~NETIF_F_ONE_FOR_ALL; 1525 features |= NETIF_F_ALL_FOR_ALL; 1526 1527 bond_for_each_slave(bond, slave, iter) { 1528 features = netdev_increment_features(features, 1529 slave->dev->features, 1530 mask); 1531 } 1532 features = netdev_add_tso_features(features, mask); 1533 1534 return features; 1535 } 1536 1537 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1538 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \ 1539 NETIF_F_HIGHDMA | NETIF_F_LRO) 1540 1541 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1542 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE) 1543 1544 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \ 1545 NETIF_F_GSO_SOFTWARE) 1546 1547 1548 static void bond_compute_features(struct bonding *bond) 1549 { 1550 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE | 1551 IFF_XMIT_DST_RELEASE_PERM; 1552 netdev_features_t gso_partial_features = NETIF_F_GSO_ESP; 1553 netdev_features_t vlan_features = BOND_VLAN_FEATURES; 1554 netdev_features_t enc_features = BOND_ENC_FEATURES; 1555 #ifdef CONFIG_XFRM_OFFLOAD 1556 netdev_features_t xfrm_features = BOND_XFRM_FEATURES; 1557 #endif /* CONFIG_XFRM_OFFLOAD */ 1558 netdev_features_t mpls_features = BOND_MPLS_FEATURES; 1559 struct net_device *bond_dev = bond->dev; 1560 struct list_head *iter; 1561 struct slave *slave; 1562 unsigned short max_hard_header_len = ETH_HLEN; 1563 unsigned int tso_max_size = TSO_MAX_SIZE; 1564 u16 tso_max_segs = TSO_MAX_SEGS; 1565 1566 if (!bond_has_slaves(bond)) 1567 goto done; 1568 vlan_features &= NETIF_F_ALL_FOR_ALL; 1569 mpls_features &= NETIF_F_ALL_FOR_ALL; 1570 1571 bond_for_each_slave(bond, slave, iter) { 1572 vlan_features = netdev_increment_features(vlan_features, 1573 slave->dev->vlan_features, BOND_VLAN_FEATURES); 1574 1575 enc_features = netdev_increment_features(enc_features, 1576 slave->dev->hw_enc_features, 1577 BOND_ENC_FEATURES); 1578 1579 #ifdef CONFIG_XFRM_OFFLOAD 1580 xfrm_features = netdev_increment_features(xfrm_features, 1581 slave->dev->hw_enc_features, 1582 BOND_XFRM_FEATURES); 1583 #endif /* CONFIG_XFRM_OFFLOAD */ 1584 1585 if (slave->dev->hw_enc_features & NETIF_F_GSO_PARTIAL) 1586 gso_partial_features &= slave->dev->gso_partial_features; 1587 1588 mpls_features = netdev_increment_features(mpls_features, 1589 slave->dev->mpls_features, 1590 BOND_MPLS_FEATURES); 1591 1592 dst_release_flag &= slave->dev->priv_flags; 1593 if (slave->dev->hard_header_len > max_hard_header_len) 1594 max_hard_header_len = slave->dev->hard_header_len; 1595 1596 tso_max_size = min(tso_max_size, slave->dev->tso_max_size); 1597 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs); 1598 } 1599 bond_dev->hard_header_len = max_hard_header_len; 1600 1601 if (gso_partial_features & NETIF_F_GSO_ESP) 1602 bond_dev->gso_partial_features |= NETIF_F_GSO_ESP; 1603 else 1604 bond_dev->gso_partial_features &= ~NETIF_F_GSO_ESP; 1605 1606 done: 1607 bond_dev->vlan_features = vlan_features; 1608 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL | 1609 NETIF_F_HW_VLAN_CTAG_TX | 1610 NETIF_F_HW_VLAN_STAG_TX; 1611 #ifdef CONFIG_XFRM_OFFLOAD 1612 bond_dev->hw_enc_features |= xfrm_features; 1613 #endif /* CONFIG_XFRM_OFFLOAD */ 1614 bond_dev->mpls_features = mpls_features; 1615 netif_set_tso_max_segs(bond_dev, tso_max_segs); 1616 netif_set_tso_max_size(bond_dev, tso_max_size); 1617 1618 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1619 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) && 1620 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM)) 1621 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE; 1622 1623 netdev_change_features(bond_dev); 1624 } 1625 1626 static void bond_setup_by_slave(struct net_device *bond_dev, 1627 struct net_device *slave_dev) 1628 { 1629 bool was_up = !!(bond_dev->flags & IFF_UP); 1630 1631 dev_close(bond_dev); 1632 1633 bond_dev->header_ops = slave_dev->header_ops; 1634 1635 bond_dev->type = slave_dev->type; 1636 bond_dev->hard_header_len = slave_dev->hard_header_len; 1637 bond_dev->needed_headroom = slave_dev->needed_headroom; 1638 bond_dev->addr_len = slave_dev->addr_len; 1639 1640 memcpy(bond_dev->broadcast, slave_dev->broadcast, 1641 slave_dev->addr_len); 1642 1643 if (slave_dev->flags & IFF_POINTOPOINT) { 1644 bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST); 1645 bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP); 1646 } 1647 if (was_up) 1648 dev_open(bond_dev, NULL); 1649 } 1650 1651 /* On bonding slaves other than the currently active slave, suppress 1652 * duplicates except for alb non-mcast/bcast. 1653 */ 1654 static bool bond_should_deliver_exact_match(struct sk_buff *skb, 1655 struct slave *slave, 1656 struct bonding *bond) 1657 { 1658 if (bond_is_slave_inactive(slave)) { 1659 if (BOND_MODE(bond) == BOND_MODE_ALB && 1660 skb->pkt_type != PACKET_BROADCAST && 1661 skb->pkt_type != PACKET_MULTICAST) 1662 return false; 1663 return true; 1664 } 1665 return false; 1666 } 1667 1668 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb) 1669 { 1670 struct sk_buff *skb = *pskb; 1671 struct slave *slave; 1672 struct bonding *bond; 1673 int (*recv_probe)(const struct sk_buff *, struct bonding *, 1674 struct slave *); 1675 int ret = RX_HANDLER_ANOTHER; 1676 1677 skb = skb_share_check(skb, GFP_ATOMIC); 1678 if (unlikely(!skb)) 1679 return RX_HANDLER_CONSUMED; 1680 1681 *pskb = skb; 1682 1683 slave = bond_slave_get_rcu(skb->dev); 1684 bond = slave->bond; 1685 1686 recv_probe = READ_ONCE(bond->recv_probe); 1687 if (recv_probe) { 1688 ret = recv_probe(skb, bond, slave); 1689 if (ret == RX_HANDLER_CONSUMED) { 1690 consume_skb(skb); 1691 return ret; 1692 } 1693 } 1694 1695 /* 1696 * For packets determined by bond_should_deliver_exact_match() call to 1697 * be suppressed we want to make an exception for link-local packets. 1698 * This is necessary for e.g. LLDP daemons to be able to monitor 1699 * inactive slave links without being forced to bind to them 1700 * explicitly. 1701 * 1702 * At the same time, packets that are passed to the bonding master 1703 * (including link-local ones) can have their originating interface 1704 * determined via PACKET_ORIGDEV socket option. 1705 */ 1706 if (bond_should_deliver_exact_match(skb, slave, bond)) { 1707 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest)) 1708 return RX_HANDLER_PASS; 1709 return RX_HANDLER_EXACT; 1710 } 1711 1712 skb->dev = bond->dev; 1713 1714 if (BOND_MODE(bond) == BOND_MODE_ALB && 1715 netif_is_bridge_port(bond->dev) && 1716 skb->pkt_type == PACKET_HOST) { 1717 1718 if (unlikely(skb_cow_head(skb, 1719 skb->data - skb_mac_header(skb)))) { 1720 kfree_skb(skb); 1721 return RX_HANDLER_CONSUMED; 1722 } 1723 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, 1724 bond->dev->addr_len); 1725 } 1726 1727 return ret; 1728 } 1729 1730 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond) 1731 { 1732 switch (BOND_MODE(bond)) { 1733 case BOND_MODE_ROUNDROBIN: 1734 return NETDEV_LAG_TX_TYPE_ROUNDROBIN; 1735 case BOND_MODE_ACTIVEBACKUP: 1736 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP; 1737 case BOND_MODE_BROADCAST: 1738 return NETDEV_LAG_TX_TYPE_BROADCAST; 1739 case BOND_MODE_XOR: 1740 case BOND_MODE_8023AD: 1741 return NETDEV_LAG_TX_TYPE_HASH; 1742 default: 1743 return NETDEV_LAG_TX_TYPE_UNKNOWN; 1744 } 1745 } 1746 1747 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond, 1748 enum netdev_lag_tx_type type) 1749 { 1750 if (type != NETDEV_LAG_TX_TYPE_HASH) 1751 return NETDEV_LAG_HASH_NONE; 1752 1753 switch (bond->params.xmit_policy) { 1754 case BOND_XMIT_POLICY_LAYER2: 1755 return NETDEV_LAG_HASH_L2; 1756 case BOND_XMIT_POLICY_LAYER34: 1757 return NETDEV_LAG_HASH_L34; 1758 case BOND_XMIT_POLICY_LAYER23: 1759 return NETDEV_LAG_HASH_L23; 1760 case BOND_XMIT_POLICY_ENCAP23: 1761 return NETDEV_LAG_HASH_E23; 1762 case BOND_XMIT_POLICY_ENCAP34: 1763 return NETDEV_LAG_HASH_E34; 1764 case BOND_XMIT_POLICY_VLAN_SRCMAC: 1765 return NETDEV_LAG_HASH_VLAN_SRCMAC; 1766 default: 1767 return NETDEV_LAG_HASH_UNKNOWN; 1768 } 1769 } 1770 1771 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave, 1772 struct netlink_ext_ack *extack) 1773 { 1774 struct netdev_lag_upper_info lag_upper_info; 1775 enum netdev_lag_tx_type type; 1776 int err; 1777 1778 type = bond_lag_tx_type(bond); 1779 lag_upper_info.tx_type = type; 1780 lag_upper_info.hash_type = bond_lag_hash_type(bond, type); 1781 1782 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave, 1783 &lag_upper_info, extack); 1784 if (err) 1785 return err; 1786 1787 slave->dev->flags |= IFF_SLAVE; 1788 return 0; 1789 } 1790 1791 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave) 1792 { 1793 netdev_upper_dev_unlink(slave->dev, bond->dev); 1794 slave->dev->flags &= ~IFF_SLAVE; 1795 } 1796 1797 static void slave_kobj_release(struct kobject *kobj) 1798 { 1799 struct slave *slave = to_slave(kobj); 1800 struct bonding *bond = bond_get_bond_by_slave(slave); 1801 1802 cancel_delayed_work_sync(&slave->notify_work); 1803 if (BOND_MODE(bond) == BOND_MODE_8023AD) 1804 kfree(SLAVE_AD_INFO(slave)); 1805 1806 kfree(slave); 1807 } 1808 1809 static struct kobj_type slave_ktype = { 1810 .release = slave_kobj_release, 1811 #ifdef CONFIG_SYSFS 1812 .sysfs_ops = &slave_sysfs_ops, 1813 #endif 1814 }; 1815 1816 static int bond_kobj_init(struct slave *slave) 1817 { 1818 int err; 1819 1820 err = kobject_init_and_add(&slave->kobj, &slave_ktype, 1821 &(slave->dev->dev.kobj), "bonding_slave"); 1822 if (err) 1823 kobject_put(&slave->kobj); 1824 1825 return err; 1826 } 1827 1828 static struct slave *bond_alloc_slave(struct bonding *bond, 1829 struct net_device *slave_dev) 1830 { 1831 struct slave *slave = NULL; 1832 1833 slave = kzalloc(sizeof(*slave), GFP_KERNEL); 1834 if (!slave) 1835 return NULL; 1836 1837 slave->bond = bond; 1838 slave->dev = slave_dev; 1839 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work); 1840 1841 if (bond_kobj_init(slave)) 1842 return NULL; 1843 1844 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 1845 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info), 1846 GFP_KERNEL); 1847 if (!SLAVE_AD_INFO(slave)) { 1848 kobject_put(&slave->kobj); 1849 return NULL; 1850 } 1851 } 1852 1853 return slave; 1854 } 1855 1856 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info) 1857 { 1858 info->bond_mode = BOND_MODE(bond); 1859 info->miimon = bond->params.miimon; 1860 info->num_slaves = bond->slave_cnt; 1861 } 1862 1863 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info) 1864 { 1865 strcpy(info->slave_name, slave->dev->name); 1866 info->link = slave->link; 1867 info->state = bond_slave_state(slave); 1868 info->link_failure_count = slave->link_failure_count; 1869 } 1870 1871 static void bond_netdev_notify_work(struct work_struct *_work) 1872 { 1873 struct slave *slave = container_of(_work, struct slave, 1874 notify_work.work); 1875 1876 if (rtnl_trylock()) { 1877 struct netdev_bonding_info binfo; 1878 1879 bond_fill_ifslave(slave, &binfo.slave); 1880 bond_fill_ifbond(slave->bond, &binfo.master); 1881 netdev_bonding_info_change(slave->dev, &binfo); 1882 rtnl_unlock(); 1883 } else { 1884 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1); 1885 } 1886 } 1887 1888 void bond_queue_slave_event(struct slave *slave) 1889 { 1890 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0); 1891 } 1892 1893 void bond_lower_state_changed(struct slave *slave) 1894 { 1895 struct netdev_lag_lower_state_info info; 1896 1897 info.link_up = slave->link == BOND_LINK_UP || 1898 slave->link == BOND_LINK_FAIL; 1899 info.tx_enabled = bond_is_active_slave(slave); 1900 netdev_lower_state_changed(slave->dev, &info); 1901 } 1902 1903 #define BOND_NL_ERR(bond_dev, extack, errmsg) do { \ 1904 if (extack) \ 1905 NL_SET_ERR_MSG(extack, errmsg); \ 1906 else \ 1907 netdev_err(bond_dev, "Error: %s\n", errmsg); \ 1908 } while (0) 1909 1910 #define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \ 1911 if (extack) \ 1912 NL_SET_ERR_MSG(extack, errmsg); \ 1913 else \ 1914 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \ 1915 } while (0) 1916 1917 /* The bonding driver uses ether_setup() to convert a master bond device 1918 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always 1919 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP 1920 * if they were set 1921 */ 1922 static void bond_ether_setup(struct net_device *bond_dev) 1923 { 1924 unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP); 1925 1926 ether_setup(bond_dev); 1927 bond_dev->flags |= IFF_MASTER | flags; 1928 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1929 } 1930 1931 void bond_xdp_set_features(struct net_device *bond_dev) 1932 { 1933 struct bonding *bond = netdev_priv(bond_dev); 1934 xdp_features_t val = NETDEV_XDP_ACT_MASK; 1935 struct list_head *iter; 1936 struct slave *slave; 1937 1938 ASSERT_RTNL(); 1939 1940 if (!bond_xdp_check(bond) || !bond_has_slaves(bond)) { 1941 xdp_clear_features_flag(bond_dev); 1942 return; 1943 } 1944 1945 bond_for_each_slave(bond, slave, iter) 1946 val &= slave->dev->xdp_features; 1947 1948 val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY; 1949 1950 xdp_set_features_flag(bond_dev, val); 1951 } 1952 1953 /* enslave device <slave> to bond device <master> */ 1954 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, 1955 struct netlink_ext_ack *extack) 1956 { 1957 struct bonding *bond = netdev_priv(bond_dev); 1958 const struct net_device_ops *slave_ops = slave_dev->netdev_ops; 1959 struct slave *new_slave = NULL, *prev_slave; 1960 struct sockaddr_storage ss; 1961 int link_reporting; 1962 int res = 0, i; 1963 1964 if (slave_dev->flags & IFF_MASTER && 1965 !netif_is_bond_master(slave_dev)) { 1966 BOND_NL_ERR(bond_dev, extack, 1967 "Device type (master device) cannot be enslaved"); 1968 return -EPERM; 1969 } 1970 1971 if (!bond->params.use_carrier && 1972 slave_dev->ethtool_ops->get_link == NULL && 1973 slave_ops->ndo_eth_ioctl == NULL) { 1974 slave_warn(bond_dev, slave_dev, "no link monitoring support\n"); 1975 } 1976 1977 /* already in-use? */ 1978 if (netdev_is_rx_handler_busy(slave_dev)) { 1979 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1980 "Device is in use and cannot be enslaved"); 1981 return -EBUSY; 1982 } 1983 1984 if (bond_dev == slave_dev) { 1985 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself."); 1986 return -EPERM; 1987 } 1988 1989 /* vlan challenged mutual exclusion */ 1990 /* no need to lock since we're protected by rtnl_lock */ 1991 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) { 1992 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n"); 1993 if (vlan_uses_dev(bond_dev)) { 1994 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 1995 "Can not enslave VLAN challenged device to VLAN enabled bond"); 1996 return -EPERM; 1997 } else { 1998 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n"); 1999 } 2000 } else { 2001 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n"); 2002 } 2003 2004 if (slave_dev->features & NETIF_F_HW_ESP) 2005 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n"); 2006 2007 /* Old ifenslave binaries are no longer supported. These can 2008 * be identified with moderate accuracy by the state of the slave: 2009 * the current ifenslave will set the interface down prior to 2010 * enslaving it; the old ifenslave will not. 2011 */ 2012 if (slave_dev->flags & IFF_UP) { 2013 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2014 "Device can not be enslaved while up"); 2015 return -EPERM; 2016 } 2017 2018 /* set bonding device ether type by slave - bonding netdevices are 2019 * created with ether_setup, so when the slave type is not ARPHRD_ETHER 2020 * there is a need to override some of the type dependent attribs/funcs. 2021 * 2022 * bond ether type mutual exclusion - don't allow slaves of dissimilar 2023 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond 2024 */ 2025 if (!bond_has_slaves(bond)) { 2026 if (bond_dev->type != slave_dev->type) { 2027 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n", 2028 bond_dev->type, slave_dev->type); 2029 2030 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, 2031 bond_dev); 2032 res = notifier_to_errno(res); 2033 if (res) { 2034 slave_err(bond_dev, slave_dev, "refused to change device type\n"); 2035 return -EBUSY; 2036 } 2037 2038 /* Flush unicast and multicast addresses */ 2039 dev_uc_flush(bond_dev); 2040 dev_mc_flush(bond_dev); 2041 2042 if (slave_dev->type != ARPHRD_ETHER) 2043 bond_setup_by_slave(bond_dev, slave_dev); 2044 else 2045 bond_ether_setup(bond_dev); 2046 2047 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, 2048 bond_dev); 2049 } 2050 } else if (bond_dev->type != slave_dev->type) { 2051 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2052 "Device type is different from other slaves"); 2053 return -EINVAL; 2054 } 2055 2056 if (slave_dev->type == ARPHRD_INFINIBAND && 2057 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2058 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2059 "Only active-backup mode is supported for infiniband slaves"); 2060 res = -EOPNOTSUPP; 2061 goto err_undo_flags; 2062 } 2063 2064 if (!slave_ops->ndo_set_mac_address || 2065 slave_dev->type == ARPHRD_INFINIBAND) { 2066 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n"); 2067 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && 2068 bond->params.fail_over_mac != BOND_FOM_ACTIVE) { 2069 if (!bond_has_slaves(bond)) { 2070 bond->params.fail_over_mac = BOND_FOM_ACTIVE; 2071 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n"); 2072 } else { 2073 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2074 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active"); 2075 res = -EOPNOTSUPP; 2076 goto err_undo_flags; 2077 } 2078 } 2079 } 2080 2081 call_netdevice_notifiers(NETDEV_JOIN, slave_dev); 2082 2083 /* If this is the first slave, then we need to set the master's hardware 2084 * address to be the same as the slave's. 2085 */ 2086 if (!bond_has_slaves(bond) && 2087 bond->dev->addr_assign_type == NET_ADDR_RANDOM) { 2088 res = bond_set_dev_addr(bond->dev, slave_dev); 2089 if (res) 2090 goto err_undo_flags; 2091 } 2092 2093 new_slave = bond_alloc_slave(bond, slave_dev); 2094 if (!new_slave) { 2095 res = -ENOMEM; 2096 goto err_undo_flags; 2097 } 2098 2099 /* Set the new_slave's queue_id to be zero. Queue ID mapping 2100 * is set via sysfs or module option if desired. 2101 */ 2102 new_slave->queue_id = 0; 2103 2104 /* Save slave's original mtu and then set it to match the bond */ 2105 new_slave->original_mtu = slave_dev->mtu; 2106 res = dev_set_mtu(slave_dev, bond->dev->mtu); 2107 if (res) { 2108 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res); 2109 goto err_free; 2110 } 2111 2112 /* Save slave's original ("permanent") mac address for modes 2113 * that need it, and for restoring it upon release, and then 2114 * set it to the master's address 2115 */ 2116 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr, 2117 slave_dev->addr_len); 2118 2119 if (!bond->params.fail_over_mac || 2120 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2121 /* Set slave to master's mac address. The application already 2122 * set the master's mac address to that of the first slave 2123 */ 2124 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 2125 ss.ss_family = slave_dev->type; 2126 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, 2127 extack); 2128 if (res) { 2129 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res); 2130 goto err_restore_mtu; 2131 } 2132 } 2133 2134 /* set no_addrconf flag before open to prevent IPv6 addrconf */ 2135 slave_dev->priv_flags |= IFF_NO_ADDRCONF; 2136 2137 /* open the slave since the application closed it */ 2138 res = dev_open(slave_dev, extack); 2139 if (res) { 2140 slave_err(bond_dev, slave_dev, "Opening slave failed\n"); 2141 goto err_restore_mac; 2142 } 2143 2144 slave_dev->priv_flags |= IFF_BONDING; 2145 /* initialize slave stats */ 2146 dev_get_stats(new_slave->dev, &new_slave->slave_stats); 2147 2148 if (bond_is_lb(bond)) { 2149 /* bond_alb_init_slave() must be called before all other stages since 2150 * it might fail and we do not want to have to undo everything 2151 */ 2152 res = bond_alb_init_slave(bond, new_slave); 2153 if (res) 2154 goto err_close; 2155 } 2156 2157 res = vlan_vids_add_by_dev(slave_dev, bond_dev); 2158 if (res) { 2159 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n"); 2160 goto err_close; 2161 } 2162 2163 prev_slave = bond_last_slave(bond); 2164 2165 new_slave->delay = 0; 2166 new_slave->link_failure_count = 0; 2167 2168 if (bond_update_speed_duplex(new_slave) && 2169 bond_needs_speed_duplex(bond)) 2170 new_slave->link = BOND_LINK_DOWN; 2171 2172 new_slave->last_rx = jiffies - 2173 (msecs_to_jiffies(bond->params.arp_interval) + 1); 2174 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) 2175 new_slave->target_last_arp_rx[i] = new_slave->last_rx; 2176 2177 new_slave->last_tx = new_slave->last_rx; 2178 2179 if (bond->params.miimon && !bond->params.use_carrier) { 2180 link_reporting = bond_check_dev_link(bond, slave_dev, 1); 2181 2182 if ((link_reporting == -1) && !bond->params.arp_interval) { 2183 /* miimon is set but a bonded network driver 2184 * does not support ETHTOOL/MII and 2185 * arp_interval is not set. Note: if 2186 * use_carrier is enabled, we will never go 2187 * here (because netif_carrier is always 2188 * supported); thus, we don't need to change 2189 * the messages for netif_carrier. 2190 */ 2191 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"); 2192 } else if (link_reporting == -1) { 2193 /* unable get link status using mii/ethtool */ 2194 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"); 2195 } 2196 } 2197 2198 /* check for initial state */ 2199 new_slave->link = BOND_LINK_NOCHANGE; 2200 if (bond->params.miimon) { 2201 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) { 2202 if (bond->params.updelay) { 2203 bond_set_slave_link_state(new_slave, 2204 BOND_LINK_BACK, 2205 BOND_SLAVE_NOTIFY_NOW); 2206 new_slave->delay = bond->params.updelay; 2207 } else { 2208 bond_set_slave_link_state(new_slave, 2209 BOND_LINK_UP, 2210 BOND_SLAVE_NOTIFY_NOW); 2211 } 2212 } else { 2213 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN, 2214 BOND_SLAVE_NOTIFY_NOW); 2215 } 2216 } else if (bond->params.arp_interval) { 2217 bond_set_slave_link_state(new_slave, 2218 (netif_carrier_ok(slave_dev) ? 2219 BOND_LINK_UP : BOND_LINK_DOWN), 2220 BOND_SLAVE_NOTIFY_NOW); 2221 } else { 2222 bond_set_slave_link_state(new_slave, BOND_LINK_UP, 2223 BOND_SLAVE_NOTIFY_NOW); 2224 } 2225 2226 if (new_slave->link != BOND_LINK_DOWN) 2227 new_slave->last_link_up = jiffies; 2228 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n", 2229 new_slave->link == BOND_LINK_DOWN ? "DOWN" : 2230 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK")); 2231 2232 if (bond_uses_primary(bond) && bond->params.primary[0]) { 2233 /* if there is a primary slave, remember it */ 2234 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) { 2235 rcu_assign_pointer(bond->primary_slave, new_slave); 2236 bond->force_primary = true; 2237 } 2238 } 2239 2240 switch (BOND_MODE(bond)) { 2241 case BOND_MODE_ACTIVEBACKUP: 2242 bond_set_slave_inactive_flags(new_slave, 2243 BOND_SLAVE_NOTIFY_NOW); 2244 break; 2245 case BOND_MODE_8023AD: 2246 /* in 802.3ad mode, the internal mechanism 2247 * will activate the slaves in the selected 2248 * aggregator 2249 */ 2250 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2251 /* if this is the first slave */ 2252 if (!prev_slave) { 2253 SLAVE_AD_INFO(new_slave)->id = 1; 2254 /* Initialize AD with the number of times that the AD timer is called in 1 second 2255 * can be called only after the mac address of the bond is set 2256 */ 2257 bond_3ad_initialize(bond); 2258 } else { 2259 SLAVE_AD_INFO(new_slave)->id = 2260 SLAVE_AD_INFO(prev_slave)->id + 1; 2261 } 2262 2263 bond_3ad_bind_slave(new_slave); 2264 break; 2265 case BOND_MODE_TLB: 2266 case BOND_MODE_ALB: 2267 bond_set_active_slave(new_slave); 2268 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW); 2269 break; 2270 default: 2271 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n"); 2272 2273 /* always active in trunk mode */ 2274 bond_set_active_slave(new_slave); 2275 2276 /* In trunking mode there is little meaning to curr_active_slave 2277 * anyway (it holds no special properties of the bond device), 2278 * so we can change it without calling change_active_interface() 2279 */ 2280 if (!rcu_access_pointer(bond->curr_active_slave) && 2281 new_slave->link == BOND_LINK_UP) 2282 rcu_assign_pointer(bond->curr_active_slave, new_slave); 2283 2284 break; 2285 } /* switch(bond_mode) */ 2286 2287 #ifdef CONFIG_NET_POLL_CONTROLLER 2288 if (bond->dev->npinfo) { 2289 if (slave_enable_netpoll(new_slave)) { 2290 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n"); 2291 res = -EBUSY; 2292 goto err_detach; 2293 } 2294 } 2295 #endif 2296 2297 if (!(bond_dev->features & NETIF_F_LRO)) 2298 dev_disable_lro(slave_dev); 2299 2300 res = netdev_rx_handler_register(slave_dev, bond_handle_frame, 2301 new_slave); 2302 if (res) { 2303 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res); 2304 goto err_detach; 2305 } 2306 2307 res = bond_master_upper_dev_link(bond, new_slave, extack); 2308 if (res) { 2309 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res); 2310 goto err_unregister; 2311 } 2312 2313 bond_lower_state_changed(new_slave); 2314 2315 res = bond_sysfs_slave_add(new_slave); 2316 if (res) { 2317 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res); 2318 goto err_upper_unlink; 2319 } 2320 2321 /* If the mode uses primary, then the following is handled by 2322 * bond_change_active_slave(). 2323 */ 2324 if (!bond_uses_primary(bond)) { 2325 /* set promiscuity level to new slave */ 2326 if (bond_dev->flags & IFF_PROMISC) { 2327 res = dev_set_promiscuity(slave_dev, 1); 2328 if (res) 2329 goto err_sysfs_del; 2330 } 2331 2332 /* set allmulti level to new slave */ 2333 if (bond_dev->flags & IFF_ALLMULTI) { 2334 res = dev_set_allmulti(slave_dev, 1); 2335 if (res) { 2336 if (bond_dev->flags & IFF_PROMISC) 2337 dev_set_promiscuity(slave_dev, -1); 2338 goto err_sysfs_del; 2339 } 2340 } 2341 2342 if (bond_dev->flags & IFF_UP) { 2343 netif_addr_lock_bh(bond_dev); 2344 dev_mc_sync_multiple(slave_dev, bond_dev); 2345 dev_uc_sync_multiple(slave_dev, bond_dev); 2346 netif_addr_unlock_bh(bond_dev); 2347 2348 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2349 dev_mc_add(slave_dev, lacpdu_mcast_addr); 2350 } 2351 } 2352 2353 bond->slave_cnt++; 2354 bond_compute_features(bond); 2355 bond_set_carrier(bond); 2356 2357 /* Needs to be called before bond_select_active_slave(), which will 2358 * remove the maddrs if the slave is selected as active slave. 2359 */ 2360 bond_slave_ns_maddrs_add(bond, new_slave); 2361 2362 if (bond_uses_primary(bond)) { 2363 block_netpoll_tx(); 2364 bond_select_active_slave(bond); 2365 unblock_netpoll_tx(); 2366 } 2367 2368 if (bond_mode_can_use_xmit_hash(bond)) 2369 bond_update_slave_arr(bond, NULL); 2370 2371 if (!slave_dev->netdev_ops->ndo_bpf || 2372 !slave_dev->netdev_ops->ndo_xdp_xmit) { 2373 if (bond->xdp_prog) { 2374 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2375 "Slave does not support XDP"); 2376 res = -EOPNOTSUPP; 2377 goto err_sysfs_del; 2378 } 2379 } else if (bond->xdp_prog) { 2380 struct netdev_bpf xdp = { 2381 .command = XDP_SETUP_PROG, 2382 .flags = 0, 2383 .prog = bond->xdp_prog, 2384 .extack = extack, 2385 }; 2386 2387 if (dev_xdp_prog_count(slave_dev) > 0) { 2388 SLAVE_NL_ERR(bond_dev, slave_dev, extack, 2389 "Slave has XDP program loaded, please unload before enslaving"); 2390 res = -EOPNOTSUPP; 2391 goto err_sysfs_del; 2392 } 2393 2394 res = dev_xdp_propagate(slave_dev, &xdp); 2395 if (res < 0) { 2396 /* ndo_bpf() sets extack error message */ 2397 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res); 2398 goto err_sysfs_del; 2399 } 2400 if (bond->xdp_prog) 2401 bpf_prog_inc(bond->xdp_prog); 2402 } 2403 2404 bond_xdp_set_features(bond_dev); 2405 2406 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n", 2407 bond_is_active_slave(new_slave) ? "an active" : "a backup", 2408 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down"); 2409 2410 /* enslave is successful */ 2411 bond_queue_slave_event(new_slave); 2412 return 0; 2413 2414 /* Undo stages on error */ 2415 err_sysfs_del: 2416 bond_sysfs_slave_del(new_slave); 2417 2418 err_upper_unlink: 2419 bond_upper_dev_unlink(bond, new_slave); 2420 2421 err_unregister: 2422 netdev_rx_handler_unregister(slave_dev); 2423 2424 err_detach: 2425 vlan_vids_del_by_dev(slave_dev, bond_dev); 2426 if (rcu_access_pointer(bond->primary_slave) == new_slave) 2427 RCU_INIT_POINTER(bond->primary_slave, NULL); 2428 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) { 2429 block_netpoll_tx(); 2430 bond_change_active_slave(bond, NULL); 2431 bond_select_active_slave(bond); 2432 unblock_netpoll_tx(); 2433 } 2434 /* either primary_slave or curr_active_slave might've changed */ 2435 synchronize_rcu(); 2436 slave_disable_netpoll(new_slave); 2437 2438 err_close: 2439 if (!netif_is_bond_master(slave_dev)) 2440 slave_dev->priv_flags &= ~IFF_BONDING; 2441 dev_close(slave_dev); 2442 2443 err_restore_mac: 2444 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2445 if (!bond->params.fail_over_mac || 2446 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2447 /* XXX TODO - fom follow mode needs to change master's 2448 * MAC if this slave's MAC is in use by the bond, or at 2449 * least print a warning. 2450 */ 2451 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr, 2452 new_slave->dev->addr_len); 2453 ss.ss_family = slave_dev->type; 2454 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2455 } 2456 2457 err_restore_mtu: 2458 dev_set_mtu(slave_dev, new_slave->original_mtu); 2459 2460 err_free: 2461 kobject_put(&new_slave->kobj); 2462 2463 err_undo_flags: 2464 /* Enslave of first slave has failed and we need to fix master's mac */ 2465 if (!bond_has_slaves(bond)) { 2466 if (ether_addr_equal_64bits(bond_dev->dev_addr, 2467 slave_dev->dev_addr)) 2468 eth_hw_addr_random(bond_dev); 2469 if (bond_dev->type != ARPHRD_ETHER) { 2470 dev_close(bond_dev); 2471 bond_ether_setup(bond_dev); 2472 } 2473 } 2474 2475 return res; 2476 } 2477 2478 /* Try to release the slave device <slave> from the bond device <master> 2479 * It is legal to access curr_active_slave without a lock because all the function 2480 * is RTNL-locked. If "all" is true it means that the function is being called 2481 * while destroying a bond interface and all slaves are being released. 2482 * 2483 * The rules for slave state should be: 2484 * for Active/Backup: 2485 * Active stays on all backups go down 2486 * for Bonded connections: 2487 * The first up interface should be left on and all others downed. 2488 */ 2489 static int __bond_release_one(struct net_device *bond_dev, 2490 struct net_device *slave_dev, 2491 bool all, bool unregister) 2492 { 2493 struct bonding *bond = netdev_priv(bond_dev); 2494 struct slave *slave, *oldcurrent; 2495 struct sockaddr_storage ss; 2496 int old_flags = bond_dev->flags; 2497 netdev_features_t old_features = bond_dev->features; 2498 2499 /* slave is not a slave or master is not master of this slave */ 2500 if (!(slave_dev->flags & IFF_SLAVE) || 2501 !netdev_has_upper_dev(slave_dev, bond_dev)) { 2502 slave_dbg(bond_dev, slave_dev, "cannot release slave\n"); 2503 return -EINVAL; 2504 } 2505 2506 block_netpoll_tx(); 2507 2508 slave = bond_get_slave_by_dev(bond, slave_dev); 2509 if (!slave) { 2510 /* not a slave of this bond */ 2511 slave_info(bond_dev, slave_dev, "interface not enslaved\n"); 2512 unblock_netpoll_tx(); 2513 return -EINVAL; 2514 } 2515 2516 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW); 2517 2518 bond_sysfs_slave_del(slave); 2519 2520 /* recompute stats just before removing the slave */ 2521 bond_get_stats(bond->dev, &bond->bond_stats); 2522 2523 if (bond->xdp_prog) { 2524 struct netdev_bpf xdp = { 2525 .command = XDP_SETUP_PROG, 2526 .flags = 0, 2527 .prog = NULL, 2528 .extack = NULL, 2529 }; 2530 if (dev_xdp_propagate(slave_dev, &xdp)) 2531 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n"); 2532 } 2533 2534 /* unregister rx_handler early so bond_handle_frame wouldn't be called 2535 * for this slave anymore. 2536 */ 2537 netdev_rx_handler_unregister(slave_dev); 2538 2539 if (BOND_MODE(bond) == BOND_MODE_8023AD) 2540 bond_3ad_unbind_slave(slave); 2541 2542 bond_upper_dev_unlink(bond, slave); 2543 2544 if (bond_mode_can_use_xmit_hash(bond)) 2545 bond_update_slave_arr(bond, slave); 2546 2547 slave_info(bond_dev, slave_dev, "Releasing %s interface\n", 2548 bond_is_active_slave(slave) ? "active" : "backup"); 2549 2550 oldcurrent = rcu_access_pointer(bond->curr_active_slave); 2551 2552 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 2553 2554 if (!all && (!bond->params.fail_over_mac || 2555 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) { 2556 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) && 2557 bond_has_slaves(bond)) 2558 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", 2559 slave->perm_hwaddr); 2560 } 2561 2562 if (rtnl_dereference(bond->primary_slave) == slave) 2563 RCU_INIT_POINTER(bond->primary_slave, NULL); 2564 2565 if (oldcurrent == slave) 2566 bond_change_active_slave(bond, NULL); 2567 2568 /* Must be called after bond_change_active_slave () as the slave 2569 * might change from an active slave to a backup slave. Then it is 2570 * necessary to clear the maddrs on the backup slave. 2571 */ 2572 bond_slave_ns_maddrs_del(bond, slave); 2573 2574 if (bond_is_lb(bond)) { 2575 /* Must be called only after the slave has been 2576 * detached from the list and the curr_active_slave 2577 * has been cleared (if our_slave == old_current), 2578 * but before a new active slave is selected. 2579 */ 2580 bond_alb_deinit_slave(bond, slave); 2581 } 2582 2583 if (all) { 2584 RCU_INIT_POINTER(bond->curr_active_slave, NULL); 2585 } else if (oldcurrent == slave) { 2586 /* Note that we hold RTNL over this sequence, so there 2587 * is no concern that another slave add/remove event 2588 * will interfere. 2589 */ 2590 bond_select_active_slave(bond); 2591 } 2592 2593 bond_set_carrier(bond); 2594 if (!bond_has_slaves(bond)) 2595 eth_hw_addr_random(bond_dev); 2596 2597 unblock_netpoll_tx(); 2598 synchronize_rcu(); 2599 bond->slave_cnt--; 2600 2601 if (!bond_has_slaves(bond)) { 2602 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev); 2603 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev); 2604 } 2605 2606 bond_compute_features(bond); 2607 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) && 2608 (old_features & NETIF_F_VLAN_CHALLENGED)) 2609 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n"); 2610 2611 vlan_vids_del_by_dev(slave_dev, bond_dev); 2612 2613 /* If the mode uses primary, then this case was handled above by 2614 * bond_change_active_slave(..., NULL) 2615 */ 2616 if (!bond_uses_primary(bond)) { 2617 /* unset promiscuity level from slave 2618 * NOTE: The NETDEV_CHANGEADDR call above may change the value 2619 * of the IFF_PROMISC flag in the bond_dev, but we need the 2620 * value of that flag before that change, as that was the value 2621 * when this slave was attached, so we cache at the start of the 2622 * function and use it here. Same goes for ALLMULTI below 2623 */ 2624 if (old_flags & IFF_PROMISC) 2625 dev_set_promiscuity(slave_dev, -1); 2626 2627 /* unset allmulti level from slave */ 2628 if (old_flags & IFF_ALLMULTI) 2629 dev_set_allmulti(slave_dev, -1); 2630 2631 if (old_flags & IFF_UP) 2632 bond_hw_addr_flush(bond_dev, slave_dev); 2633 } 2634 2635 slave_disable_netpoll(slave); 2636 2637 /* close slave before restoring its mac address */ 2638 dev_close(slave_dev); 2639 2640 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF; 2641 2642 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE || 2643 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2644 /* restore original ("permanent") mac address */ 2645 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr, 2646 slave->dev->addr_len); 2647 ss.ss_family = slave_dev->type; 2648 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL); 2649 } 2650 2651 if (unregister) 2652 __dev_set_mtu(slave_dev, slave->original_mtu); 2653 else 2654 dev_set_mtu(slave_dev, slave->original_mtu); 2655 2656 if (!netif_is_bond_master(slave_dev)) 2657 slave_dev->priv_flags &= ~IFF_BONDING; 2658 2659 bond_xdp_set_features(bond_dev); 2660 kobject_put(&slave->kobj); 2661 2662 return 0; 2663 } 2664 2665 /* A wrapper used because of ndo_del_link */ 2666 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev) 2667 { 2668 return __bond_release_one(bond_dev, slave_dev, false, false); 2669 } 2670 2671 /* First release a slave and then destroy the bond if no more slaves are left. 2672 * Must be under rtnl_lock when this function is called. 2673 */ 2674 static int bond_release_and_destroy(struct net_device *bond_dev, 2675 struct net_device *slave_dev) 2676 { 2677 struct bonding *bond = netdev_priv(bond_dev); 2678 int ret; 2679 2680 ret = __bond_release_one(bond_dev, slave_dev, false, true); 2681 if (ret == 0 && !bond_has_slaves(bond) && 2682 bond_dev->reg_state != NETREG_UNREGISTERING) { 2683 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; 2684 netdev_info(bond_dev, "Destroying bond\n"); 2685 bond_remove_proc_entry(bond); 2686 unregister_netdevice(bond_dev); 2687 } 2688 return ret; 2689 } 2690 2691 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info) 2692 { 2693 struct bonding *bond = netdev_priv(bond_dev); 2694 2695 bond_fill_ifbond(bond, info); 2696 } 2697 2698 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info) 2699 { 2700 struct bonding *bond = netdev_priv(bond_dev); 2701 struct list_head *iter; 2702 int i = 0, res = -ENODEV; 2703 struct slave *slave; 2704 2705 bond_for_each_slave(bond, slave, iter) { 2706 if (i++ == (int)info->slave_id) { 2707 res = 0; 2708 bond_fill_ifslave(slave, info); 2709 break; 2710 } 2711 } 2712 2713 return res; 2714 } 2715 2716 /*-------------------------------- Monitoring -------------------------------*/ 2717 2718 /* called with rcu_read_lock() */ 2719 static int bond_miimon_inspect(struct bonding *bond) 2720 { 2721 bool ignore_updelay = false; 2722 int link_state, commit = 0; 2723 struct list_head *iter; 2724 struct slave *slave; 2725 2726 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) { 2727 ignore_updelay = !rcu_dereference(bond->curr_active_slave); 2728 } else { 2729 struct bond_up_slave *usable_slaves; 2730 2731 usable_slaves = rcu_dereference(bond->usable_slaves); 2732 2733 if (usable_slaves && usable_slaves->count == 0) 2734 ignore_updelay = true; 2735 } 2736 2737 bond_for_each_slave_rcu(bond, slave, iter) { 2738 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2739 2740 link_state = bond_check_dev_link(bond, slave->dev, 0); 2741 2742 switch (slave->link) { 2743 case BOND_LINK_UP: 2744 if (link_state) 2745 continue; 2746 2747 bond_propose_link_state(slave, BOND_LINK_FAIL); 2748 commit++; 2749 slave->delay = bond->params.downdelay; 2750 if (slave->delay && net_ratelimit()) { 2751 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n", 2752 (BOND_MODE(bond) == 2753 BOND_MODE_ACTIVEBACKUP) ? 2754 (bond_is_active_slave(slave) ? 2755 "active " : "backup ") : "", 2756 bond->params.downdelay * bond->params.miimon); 2757 } 2758 fallthrough; 2759 case BOND_LINK_FAIL: 2760 if (link_state) { 2761 /* recovered before downdelay expired */ 2762 bond_propose_link_state(slave, BOND_LINK_UP); 2763 slave->last_link_up = jiffies; 2764 if (net_ratelimit()) 2765 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n", 2766 (bond->params.downdelay - slave->delay) * 2767 bond->params.miimon); 2768 commit++; 2769 continue; 2770 } 2771 2772 if (slave->delay <= 0) { 2773 bond_propose_link_state(slave, BOND_LINK_DOWN); 2774 commit++; 2775 continue; 2776 } 2777 2778 slave->delay--; 2779 break; 2780 2781 case BOND_LINK_DOWN: 2782 if (!link_state) 2783 continue; 2784 2785 bond_propose_link_state(slave, BOND_LINK_BACK); 2786 commit++; 2787 slave->delay = bond->params.updelay; 2788 2789 if (slave->delay && net_ratelimit()) { 2790 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n", 2791 ignore_updelay ? 0 : 2792 bond->params.updelay * 2793 bond->params.miimon); 2794 } 2795 fallthrough; 2796 case BOND_LINK_BACK: 2797 if (!link_state) { 2798 bond_propose_link_state(slave, BOND_LINK_DOWN); 2799 if (net_ratelimit()) 2800 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n", 2801 (bond->params.updelay - slave->delay) * 2802 bond->params.miimon); 2803 commit++; 2804 continue; 2805 } 2806 2807 if (ignore_updelay) 2808 slave->delay = 0; 2809 2810 if (slave->delay <= 0) { 2811 bond_propose_link_state(slave, BOND_LINK_UP); 2812 commit++; 2813 ignore_updelay = false; 2814 continue; 2815 } 2816 2817 slave->delay--; 2818 break; 2819 } 2820 } 2821 2822 return commit; 2823 } 2824 2825 static void bond_miimon_link_change(struct bonding *bond, 2826 struct slave *slave, 2827 char link) 2828 { 2829 switch (BOND_MODE(bond)) { 2830 case BOND_MODE_8023AD: 2831 bond_3ad_handle_link_change(slave, link); 2832 break; 2833 case BOND_MODE_TLB: 2834 case BOND_MODE_ALB: 2835 bond_alb_handle_link_change(bond, slave, link); 2836 break; 2837 case BOND_MODE_XOR: 2838 bond_update_slave_arr(bond, NULL); 2839 break; 2840 } 2841 } 2842 2843 static void bond_miimon_commit(struct bonding *bond) 2844 { 2845 struct slave *slave, *primary, *active; 2846 bool do_failover = false; 2847 struct list_head *iter; 2848 2849 ASSERT_RTNL(); 2850 2851 bond_for_each_slave(bond, slave, iter) { 2852 switch (slave->link_new_state) { 2853 case BOND_LINK_NOCHANGE: 2854 /* For 802.3ad mode, check current slave speed and 2855 * duplex again in case its port was disabled after 2856 * invalid speed/duplex reporting but recovered before 2857 * link monitoring could make a decision on the actual 2858 * link status 2859 */ 2860 if (BOND_MODE(bond) == BOND_MODE_8023AD && 2861 slave->link == BOND_LINK_UP) 2862 bond_3ad_adapter_speed_duplex_changed(slave); 2863 continue; 2864 2865 case BOND_LINK_UP: 2866 if (bond_update_speed_duplex(slave) && 2867 bond_needs_speed_duplex(bond)) { 2868 slave->link = BOND_LINK_DOWN; 2869 if (net_ratelimit()) 2870 slave_warn(bond->dev, slave->dev, 2871 "failed to get link speed/duplex\n"); 2872 continue; 2873 } 2874 bond_set_slave_link_state(slave, BOND_LINK_UP, 2875 BOND_SLAVE_NOTIFY_NOW); 2876 slave->last_link_up = jiffies; 2877 2878 primary = rtnl_dereference(bond->primary_slave); 2879 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 2880 /* prevent it from being the active one */ 2881 bond_set_backup_slave(slave); 2882 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) { 2883 /* make it immediately active */ 2884 bond_set_active_slave(slave); 2885 } 2886 2887 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n", 2888 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed, 2889 slave->duplex ? "full" : "half"); 2890 2891 bond_miimon_link_change(bond, slave, BOND_LINK_UP); 2892 2893 active = rtnl_dereference(bond->curr_active_slave); 2894 if (!active || slave == primary || slave->prio > active->prio) 2895 do_failover = true; 2896 2897 continue; 2898 2899 case BOND_LINK_DOWN: 2900 if (slave->link_failure_count < UINT_MAX) 2901 slave->link_failure_count++; 2902 2903 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 2904 BOND_SLAVE_NOTIFY_NOW); 2905 2906 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP || 2907 BOND_MODE(bond) == BOND_MODE_8023AD) 2908 bond_set_slave_inactive_flags(slave, 2909 BOND_SLAVE_NOTIFY_NOW); 2910 2911 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 2912 2913 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN); 2914 2915 if (slave == rcu_access_pointer(bond->curr_active_slave)) 2916 do_failover = true; 2917 2918 continue; 2919 2920 default: 2921 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n", 2922 slave->link_new_state); 2923 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 2924 2925 continue; 2926 } 2927 } 2928 2929 if (do_failover) { 2930 block_netpoll_tx(); 2931 bond_select_active_slave(bond); 2932 unblock_netpoll_tx(); 2933 } 2934 2935 bond_set_carrier(bond); 2936 } 2937 2938 /* bond_mii_monitor 2939 * 2940 * Really a wrapper that splits the mii monitor into two phases: an 2941 * inspection, then (if inspection indicates something needs to be done) 2942 * an acquisition of appropriate locks followed by a commit phase to 2943 * implement whatever link state changes are indicated. 2944 */ 2945 static void bond_mii_monitor(struct work_struct *work) 2946 { 2947 struct bonding *bond = container_of(work, struct bonding, 2948 mii_work.work); 2949 bool should_notify_peers = false; 2950 bool commit; 2951 unsigned long delay; 2952 struct slave *slave; 2953 struct list_head *iter; 2954 2955 delay = msecs_to_jiffies(bond->params.miimon); 2956 2957 if (!bond_has_slaves(bond)) 2958 goto re_arm; 2959 2960 rcu_read_lock(); 2961 should_notify_peers = bond_should_notify_peers(bond); 2962 commit = !!bond_miimon_inspect(bond); 2963 if (bond->send_peer_notif) { 2964 rcu_read_unlock(); 2965 if (rtnl_trylock()) { 2966 bond->send_peer_notif--; 2967 rtnl_unlock(); 2968 } 2969 } else { 2970 rcu_read_unlock(); 2971 } 2972 2973 if (commit) { 2974 /* Race avoidance with bond_close cancel of workqueue */ 2975 if (!rtnl_trylock()) { 2976 delay = 1; 2977 should_notify_peers = false; 2978 goto re_arm; 2979 } 2980 2981 bond_for_each_slave(bond, slave, iter) { 2982 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER); 2983 } 2984 bond_miimon_commit(bond); 2985 2986 rtnl_unlock(); /* might sleep, hold no other locks */ 2987 } 2988 2989 re_arm: 2990 if (bond->params.miimon) 2991 queue_delayed_work(bond->wq, &bond->mii_work, delay); 2992 2993 if (should_notify_peers) { 2994 if (!rtnl_trylock()) 2995 return; 2996 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev); 2997 rtnl_unlock(); 2998 } 2999 } 3000 3001 static int bond_upper_dev_walk(struct net_device *upper, 3002 struct netdev_nested_priv *priv) 3003 { 3004 __be32 ip = *(__be32 *)priv->data; 3005 3006 return ip == bond_confirm_addr(upper, 0, ip); 3007 } 3008 3009 static bool bond_has_this_ip(struct bonding *bond, __be32 ip) 3010 { 3011 struct netdev_nested_priv priv = { 3012 .data = (void *)&ip, 3013 }; 3014 bool ret = false; 3015 3016 if (ip == bond_confirm_addr(bond->dev, 0, ip)) 3017 return true; 3018 3019 rcu_read_lock(); 3020 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv)) 3021 ret = true; 3022 rcu_read_unlock(); 3023 3024 return ret; 3025 } 3026 3027 #define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff) 3028 3029 static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags, 3030 struct sk_buff *skb) 3031 { 3032 struct net_device *bond_dev = slave->bond->dev; 3033 struct net_device *slave_dev = slave->dev; 3034 struct bond_vlan_tag *outer_tag = tags; 3035 3036 if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE) 3037 return true; 3038 3039 tags++; 3040 3041 /* Go through all the tags backwards and add them to the packet */ 3042 while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) { 3043 if (!tags->vlan_id) { 3044 tags++; 3045 continue; 3046 } 3047 3048 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n", 3049 ntohs(outer_tag->vlan_proto), tags->vlan_id); 3050 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto, 3051 tags->vlan_id); 3052 if (!skb) { 3053 net_err_ratelimited("failed to insert inner VLAN tag\n"); 3054 return false; 3055 } 3056 3057 tags++; 3058 } 3059 /* Set the outer tag */ 3060 if (outer_tag->vlan_id) { 3061 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n", 3062 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id); 3063 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto, 3064 outer_tag->vlan_id); 3065 } 3066 3067 return true; 3068 } 3069 3070 /* We go to the (large) trouble of VLAN tagging ARP frames because 3071 * switches in VLAN mode (especially if ports are configured as 3072 * "native" to a VLAN) might not pass non-tagged frames. 3073 */ 3074 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip, 3075 __be32 src_ip, struct bond_vlan_tag *tags) 3076 { 3077 struct net_device *bond_dev = slave->bond->dev; 3078 struct net_device *slave_dev = slave->dev; 3079 struct sk_buff *skb; 3080 3081 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n", 3082 arp_op, &dest_ip, &src_ip); 3083 3084 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip, 3085 NULL, slave_dev->dev_addr, NULL); 3086 3087 if (!skb) { 3088 net_err_ratelimited("ARP packet allocation failed\n"); 3089 return; 3090 } 3091 3092 if (bond_handle_vlan(slave, tags, skb)) { 3093 slave_update_last_tx(slave); 3094 arp_xmit(skb); 3095 } 3096 3097 return; 3098 } 3099 3100 /* Validate the device path between the @start_dev and the @end_dev. 3101 * The path is valid if the @end_dev is reachable through device 3102 * stacking. 3103 * When the path is validated, collect any vlan information in the 3104 * path. 3105 */ 3106 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev, 3107 struct net_device *end_dev, 3108 int level) 3109 { 3110 struct bond_vlan_tag *tags; 3111 struct net_device *upper; 3112 struct list_head *iter; 3113 3114 if (start_dev == end_dev) { 3115 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC); 3116 if (!tags) 3117 return ERR_PTR(-ENOMEM); 3118 tags[level].vlan_proto = BOND_VLAN_PROTO_NONE; 3119 return tags; 3120 } 3121 3122 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) { 3123 tags = bond_verify_device_path(upper, end_dev, level + 1); 3124 if (IS_ERR_OR_NULL(tags)) { 3125 if (IS_ERR(tags)) 3126 return tags; 3127 continue; 3128 } 3129 if (is_vlan_dev(upper)) { 3130 tags[level].vlan_proto = vlan_dev_vlan_proto(upper); 3131 tags[level].vlan_id = vlan_dev_vlan_id(upper); 3132 } 3133 3134 return tags; 3135 } 3136 3137 return NULL; 3138 } 3139 3140 static void bond_arp_send_all(struct bonding *bond, struct slave *slave) 3141 { 3142 struct rtable *rt; 3143 struct bond_vlan_tag *tags; 3144 __be32 *targets = bond->params.arp_targets, addr; 3145 int i; 3146 3147 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) { 3148 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n", 3149 __func__, &targets[i]); 3150 tags = NULL; 3151 3152 /* Find out through which dev should the packet go */ 3153 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 0, 0, 3154 RT_SCOPE_LINK); 3155 if (IS_ERR(rt)) { 3156 /* there's no route to target - try to send arp 3157 * probe to generate any traffic (arp_validate=0) 3158 */ 3159 if (bond->params.arp_validate) 3160 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n", 3161 bond->dev->name, 3162 &targets[i]); 3163 bond_arp_send(slave, ARPOP_REQUEST, targets[i], 3164 0, tags); 3165 continue; 3166 } 3167 3168 /* bond device itself */ 3169 if (rt->dst.dev == bond->dev) 3170 goto found; 3171 3172 rcu_read_lock(); 3173 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0); 3174 rcu_read_unlock(); 3175 3176 if (!IS_ERR_OR_NULL(tags)) 3177 goto found; 3178 3179 /* Not our device - skip */ 3180 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n", 3181 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL"); 3182 3183 ip_rt_put(rt); 3184 continue; 3185 3186 found: 3187 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0); 3188 ip_rt_put(rt); 3189 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags); 3190 kfree(tags); 3191 } 3192 } 3193 3194 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip) 3195 { 3196 int i; 3197 3198 if (!sip || !bond_has_this_ip(bond, tip)) { 3199 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n", 3200 __func__, &sip, &tip); 3201 return; 3202 } 3203 3204 i = bond_get_targets_ip(bond->params.arp_targets, sip); 3205 if (i == -1) { 3206 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n", 3207 __func__, &sip); 3208 return; 3209 } 3210 slave->last_rx = jiffies; 3211 slave->target_last_arp_rx[i] = jiffies; 3212 } 3213 3214 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, 3215 struct slave *slave) 3216 { 3217 struct arphdr *arp = (struct arphdr *)skb->data; 3218 struct slave *curr_active_slave, *curr_arp_slave; 3219 unsigned char *arp_ptr; 3220 __be32 sip, tip; 3221 unsigned int alen; 3222 3223 alen = arp_hdr_len(bond->dev); 3224 3225 if (alen > skb_headlen(skb)) { 3226 arp = kmalloc(alen, GFP_ATOMIC); 3227 if (!arp) 3228 goto out_unlock; 3229 if (skb_copy_bits(skb, 0, arp, alen) < 0) 3230 goto out_unlock; 3231 } 3232 3233 if (arp->ar_hln != bond->dev->addr_len || 3234 skb->pkt_type == PACKET_OTHERHOST || 3235 skb->pkt_type == PACKET_LOOPBACK || 3236 arp->ar_hrd != htons(ARPHRD_ETHER) || 3237 arp->ar_pro != htons(ETH_P_IP) || 3238 arp->ar_pln != 4) 3239 goto out_unlock; 3240 3241 arp_ptr = (unsigned char *)(arp + 1); 3242 arp_ptr += bond->dev->addr_len; 3243 memcpy(&sip, arp_ptr, 4); 3244 arp_ptr += 4 + bond->dev->addr_len; 3245 memcpy(&tip, arp_ptr, 4); 3246 3247 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n", 3248 __func__, slave->dev->name, bond_slave_state(slave), 3249 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3250 &sip, &tip); 3251 3252 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3253 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3254 3255 /* We 'trust' the received ARP enough to validate it if: 3256 * 3257 * (a) the slave receiving the ARP is active (which includes the 3258 * current ARP slave, if any), or 3259 * 3260 * (b) the receiving slave isn't active, but there is a currently 3261 * active slave and it received valid arp reply(s) after it became 3262 * the currently active slave, or 3263 * 3264 * (c) there is an ARP slave that sent an ARP during the prior ARP 3265 * interval, and we receive an ARP reply on any slave. We accept 3266 * these because switch FDB update delays may deliver the ARP 3267 * reply to a slave other than the sender of the ARP request. 3268 * 3269 * Note: for (b), backup slaves are receiving the broadcast ARP 3270 * request, not a reply. This request passes from the sending 3271 * slave through the L2 switch(es) to the receiving slave. Since 3272 * this is checking the request, sip/tip are swapped for 3273 * validation. 3274 * 3275 * This is done to avoid endless looping when we can't reach the 3276 * arp_ip_target and fool ourselves with our own arp requests. 3277 */ 3278 if (bond_is_active_slave(slave)) 3279 bond_validate_arp(bond, slave, sip, tip); 3280 else if (curr_active_slave && 3281 time_after(slave_last_rx(bond, curr_active_slave), 3282 curr_active_slave->last_link_up)) 3283 bond_validate_arp(bond, slave, tip, sip); 3284 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) && 3285 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3286 bond_validate_arp(bond, slave, sip, tip); 3287 3288 out_unlock: 3289 if (arp != (struct arphdr *)skb->data) 3290 kfree(arp); 3291 return RX_HANDLER_ANOTHER; 3292 } 3293 3294 #if IS_ENABLED(CONFIG_IPV6) 3295 static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr, 3296 const struct in6_addr *saddr, struct bond_vlan_tag *tags) 3297 { 3298 struct net_device *bond_dev = slave->bond->dev; 3299 struct net_device *slave_dev = slave->dev; 3300 struct in6_addr mcaddr; 3301 struct sk_buff *skb; 3302 3303 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n", 3304 daddr, saddr); 3305 3306 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0); 3307 if (!skb) { 3308 net_err_ratelimited("NS packet allocation failed\n"); 3309 return; 3310 } 3311 3312 addrconf_addr_solict_mult(daddr, &mcaddr); 3313 if (bond_handle_vlan(slave, tags, skb)) { 3314 slave_update_last_tx(slave); 3315 ndisc_send_skb(skb, &mcaddr, saddr); 3316 } 3317 } 3318 3319 static void bond_ns_send_all(struct bonding *bond, struct slave *slave) 3320 { 3321 struct in6_addr *targets = bond->params.ns_targets; 3322 struct bond_vlan_tag *tags; 3323 struct dst_entry *dst; 3324 struct in6_addr saddr; 3325 struct flowi6 fl6; 3326 int i; 3327 3328 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) { 3329 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n", 3330 __func__, &targets[i]); 3331 tags = NULL; 3332 3333 /* Find out through which dev should the packet go */ 3334 memset(&fl6, 0, sizeof(struct flowi6)); 3335 fl6.daddr = targets[i]; 3336 fl6.flowi6_oif = bond->dev->ifindex; 3337 3338 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6); 3339 if (dst->error) { 3340 dst_release(dst); 3341 /* there's no route to target - try to send arp 3342 * probe to generate any traffic (arp_validate=0) 3343 */ 3344 if (bond->params.arp_validate) 3345 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n", 3346 bond->dev->name, 3347 &targets[i]); 3348 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3349 continue; 3350 } 3351 3352 /* bond device itself */ 3353 if (dst->dev == bond->dev) 3354 goto found; 3355 3356 rcu_read_lock(); 3357 tags = bond_verify_device_path(bond->dev, dst->dev, 0); 3358 rcu_read_unlock(); 3359 3360 if (!IS_ERR_OR_NULL(tags)) 3361 goto found; 3362 3363 /* Not our device - skip */ 3364 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n", 3365 &targets[i], dst->dev ? dst->dev->name : "NULL"); 3366 3367 dst_release(dst); 3368 continue; 3369 3370 found: 3371 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr)) 3372 bond_ns_send(slave, &targets[i], &saddr, tags); 3373 else 3374 bond_ns_send(slave, &targets[i], &in6addr_any, tags); 3375 3376 dst_release(dst); 3377 kfree(tags); 3378 } 3379 } 3380 3381 static int bond_confirm_addr6(struct net_device *dev, 3382 struct netdev_nested_priv *priv) 3383 { 3384 struct in6_addr *addr = (struct in6_addr *)priv->data; 3385 3386 return ipv6_chk_addr(dev_net(dev), addr, dev, 0); 3387 } 3388 3389 static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr) 3390 { 3391 struct netdev_nested_priv priv = { 3392 .data = addr, 3393 }; 3394 int ret = false; 3395 3396 if (bond_confirm_addr6(bond->dev, &priv)) 3397 return true; 3398 3399 rcu_read_lock(); 3400 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv)) 3401 ret = true; 3402 rcu_read_unlock(); 3403 3404 return ret; 3405 } 3406 3407 static void bond_validate_na(struct bonding *bond, struct slave *slave, 3408 struct in6_addr *saddr, struct in6_addr *daddr) 3409 { 3410 int i; 3411 3412 /* Ignore NAs that: 3413 * 1. Source address is unspecified address. 3414 * 2. Dest address is neither all-nodes multicast address nor 3415 * exist on bond interface. 3416 */ 3417 if (ipv6_addr_any(saddr) || 3418 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) && 3419 !bond_has_this_ip6(bond, daddr))) { 3420 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n", 3421 __func__, saddr, daddr); 3422 return; 3423 } 3424 3425 i = bond_get_targets_ip6(bond->params.ns_targets, saddr); 3426 if (i == -1) { 3427 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n", 3428 __func__, saddr); 3429 return; 3430 } 3431 slave->last_rx = jiffies; 3432 slave->target_last_arp_rx[i] = jiffies; 3433 } 3434 3435 static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond, 3436 struct slave *slave) 3437 { 3438 struct slave *curr_active_slave, *curr_arp_slave; 3439 struct in6_addr *saddr, *daddr; 3440 struct { 3441 struct ipv6hdr ip6; 3442 struct icmp6hdr icmp6; 3443 } *combined, _combined; 3444 3445 if (skb->pkt_type == PACKET_OTHERHOST || 3446 skb->pkt_type == PACKET_LOOPBACK) 3447 goto out; 3448 3449 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined); 3450 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP || 3451 (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION && 3452 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT)) 3453 goto out; 3454 3455 saddr = &combined->ip6.saddr; 3456 daddr = &combined->ip6.daddr; 3457 3458 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n", 3459 __func__, slave->dev->name, bond_slave_state(slave), 3460 bond->params.arp_validate, slave_do_arp_validate(bond, slave), 3461 saddr, daddr); 3462 3463 curr_active_slave = rcu_dereference(bond->curr_active_slave); 3464 curr_arp_slave = rcu_dereference(bond->current_arp_slave); 3465 3466 /* We 'trust' the received ARP enough to validate it if: 3467 * see bond_arp_rcv(). 3468 */ 3469 if (bond_is_active_slave(slave)) 3470 bond_validate_na(bond, slave, saddr, daddr); 3471 else if (curr_active_slave && 3472 time_after(slave_last_rx(bond, curr_active_slave), 3473 curr_active_slave->last_link_up)) 3474 bond_validate_na(bond, slave, daddr, saddr); 3475 else if (curr_arp_slave && 3476 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1)) 3477 bond_validate_na(bond, slave, saddr, daddr); 3478 3479 out: 3480 return RX_HANDLER_ANOTHER; 3481 } 3482 #endif 3483 3484 int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond, 3485 struct slave *slave) 3486 { 3487 #if IS_ENABLED(CONFIG_IPV6) 3488 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6); 3489 #endif 3490 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP); 3491 3492 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n", 3493 __func__, skb->dev->name); 3494 3495 /* Use arp validate logic for both ARP and NS */ 3496 if (!slave_do_arp_validate(bond, slave)) { 3497 if ((slave_do_arp_validate_only(bond) && is_arp) || 3498 #if IS_ENABLED(CONFIG_IPV6) 3499 (slave_do_arp_validate_only(bond) && is_ipv6) || 3500 #endif 3501 !slave_do_arp_validate_only(bond)) 3502 slave->last_rx = jiffies; 3503 return RX_HANDLER_ANOTHER; 3504 } else if (is_arp) { 3505 return bond_arp_rcv(skb, bond, slave); 3506 #if IS_ENABLED(CONFIG_IPV6) 3507 } else if (is_ipv6) { 3508 return bond_na_rcv(skb, bond, slave); 3509 #endif 3510 } else { 3511 return RX_HANDLER_ANOTHER; 3512 } 3513 } 3514 3515 static void bond_send_validate(struct bonding *bond, struct slave *slave) 3516 { 3517 bond_arp_send_all(bond, slave); 3518 #if IS_ENABLED(CONFIG_IPV6) 3519 bond_ns_send_all(bond, slave); 3520 #endif 3521 } 3522 3523 /* function to verify if we're in the arp_interval timeslice, returns true if 3524 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval + 3525 * arp_interval/2) . the arp_interval/2 is needed for really fast networks. 3526 */ 3527 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act, 3528 int mod) 3529 { 3530 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3531 3532 return time_in_range(jiffies, 3533 last_act - delta_in_ticks, 3534 last_act + mod * delta_in_ticks + delta_in_ticks/2); 3535 } 3536 3537 /* This function is called regularly to monitor each slave's link 3538 * ensuring that traffic is being sent and received when arp monitoring 3539 * is used in load-balancing mode. if the adapter has been dormant, then an 3540 * arp is transmitted to generate traffic. see activebackup_arp_monitor for 3541 * arp monitoring in active backup mode. 3542 */ 3543 static void bond_loadbalance_arp_mon(struct bonding *bond) 3544 { 3545 struct slave *slave, *oldcurrent; 3546 struct list_head *iter; 3547 int do_failover = 0, slave_state_changed = 0; 3548 3549 if (!bond_has_slaves(bond)) 3550 goto re_arm; 3551 3552 rcu_read_lock(); 3553 3554 oldcurrent = rcu_dereference(bond->curr_active_slave); 3555 /* see if any of the previous devices are up now (i.e. they have 3556 * xmt and rcv traffic). the curr_active_slave does not come into 3557 * the picture unless it is null. also, slave->last_link_up is not 3558 * needed here because we send an arp on each slave and give a slave 3559 * as long as it needs to get the tx/rx within the delta. 3560 * TODO: what about up/down delay in arp mode? it wasn't here before 3561 * so it can wait 3562 */ 3563 bond_for_each_slave_rcu(bond, slave, iter) { 3564 unsigned long last_tx = slave_last_tx(slave); 3565 3566 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3567 3568 if (slave->link != BOND_LINK_UP) { 3569 if (bond_time_in_interval(bond, last_tx, 1) && 3570 bond_time_in_interval(bond, slave->last_rx, 1)) { 3571 3572 bond_propose_link_state(slave, BOND_LINK_UP); 3573 slave_state_changed = 1; 3574 3575 /* primary_slave has no meaning in round-robin 3576 * mode. the window of a slave being up and 3577 * curr_active_slave being null after enslaving 3578 * is closed. 3579 */ 3580 if (!oldcurrent) { 3581 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3582 do_failover = 1; 3583 } else { 3584 slave_info(bond->dev, slave->dev, "interface is now up\n"); 3585 } 3586 } 3587 } else { 3588 /* slave->link == BOND_LINK_UP */ 3589 3590 /* not all switches will respond to an arp request 3591 * when the source ip is 0, so don't take the link down 3592 * if we don't know our ip yet 3593 */ 3594 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3595 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) { 3596 3597 bond_propose_link_state(slave, BOND_LINK_DOWN); 3598 slave_state_changed = 1; 3599 3600 if (slave->link_failure_count < UINT_MAX) 3601 slave->link_failure_count++; 3602 3603 slave_info(bond->dev, slave->dev, "interface is now down\n"); 3604 3605 if (slave == oldcurrent) 3606 do_failover = 1; 3607 } 3608 } 3609 3610 /* note: if switch is in round-robin mode, all links 3611 * must tx arp to ensure all links rx an arp - otherwise 3612 * links may oscillate or not come up at all; if switch is 3613 * in something like xor mode, there is nothing we can 3614 * do - all replies will be rx'ed on same link causing slaves 3615 * to be unstable during low/no traffic periods 3616 */ 3617 if (bond_slave_is_up(slave)) 3618 bond_send_validate(bond, slave); 3619 } 3620 3621 rcu_read_unlock(); 3622 3623 if (do_failover || slave_state_changed) { 3624 if (!rtnl_trylock()) 3625 goto re_arm; 3626 3627 bond_for_each_slave(bond, slave, iter) { 3628 if (slave->link_new_state != BOND_LINK_NOCHANGE) 3629 slave->link = slave->link_new_state; 3630 } 3631 3632 if (slave_state_changed) { 3633 bond_slave_state_change(bond); 3634 if (BOND_MODE(bond) == BOND_MODE_XOR) 3635 bond_update_slave_arr(bond, NULL); 3636 } 3637 if (do_failover) { 3638 block_netpoll_tx(); 3639 bond_select_active_slave(bond); 3640 unblock_netpoll_tx(); 3641 } 3642 rtnl_unlock(); 3643 } 3644 3645 re_arm: 3646 if (bond->params.arp_interval) 3647 queue_delayed_work(bond->wq, &bond->arp_work, 3648 msecs_to_jiffies(bond->params.arp_interval)); 3649 } 3650 3651 /* Called to inspect slaves for active-backup mode ARP monitor link state 3652 * changes. Sets proposed link state in slaves to specify what action 3653 * should take place for the slave. Returns 0 if no changes are found, >0 3654 * if changes to link states must be committed. 3655 * 3656 * Called with rcu_read_lock held. 3657 */ 3658 static int bond_ab_arp_inspect(struct bonding *bond) 3659 { 3660 unsigned long last_tx, last_rx; 3661 struct list_head *iter; 3662 struct slave *slave; 3663 int commit = 0; 3664 3665 bond_for_each_slave_rcu(bond, slave, iter) { 3666 bond_propose_link_state(slave, BOND_LINK_NOCHANGE); 3667 last_rx = slave_last_rx(bond, slave); 3668 3669 if (slave->link != BOND_LINK_UP) { 3670 if (bond_time_in_interval(bond, last_rx, 1)) { 3671 bond_propose_link_state(slave, BOND_LINK_UP); 3672 commit++; 3673 } else if (slave->link == BOND_LINK_BACK) { 3674 bond_propose_link_state(slave, BOND_LINK_FAIL); 3675 commit++; 3676 } 3677 continue; 3678 } 3679 3680 /* Give slaves 2*delta after being enslaved or made 3681 * active. This avoids bouncing, as the last receive 3682 * times need a full ARP monitor cycle to be updated. 3683 */ 3684 if (bond_time_in_interval(bond, slave->last_link_up, 2)) 3685 continue; 3686 3687 /* Backup slave is down if: 3688 * - No current_arp_slave AND 3689 * - more than (missed_max+1)*delta since last receive AND 3690 * - the bond has an IP address 3691 * 3692 * Note: a non-null current_arp_slave indicates 3693 * the curr_active_slave went down and we are 3694 * searching for a new one; under this condition 3695 * we only take the curr_active_slave down - this 3696 * gives each slave a chance to tx/rx traffic 3697 * before being taken out 3698 */ 3699 if (!bond_is_active_slave(slave) && 3700 !rcu_access_pointer(bond->current_arp_slave) && 3701 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) { 3702 bond_propose_link_state(slave, BOND_LINK_DOWN); 3703 commit++; 3704 } 3705 3706 /* Active slave is down if: 3707 * - more than missed_max*delta since transmitting OR 3708 * - (more than missed_max*delta since receive AND 3709 * the bond has an IP address) 3710 */ 3711 last_tx = slave_last_tx(slave); 3712 if (bond_is_active_slave(slave) && 3713 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) || 3714 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) { 3715 bond_propose_link_state(slave, BOND_LINK_DOWN); 3716 commit++; 3717 } 3718 } 3719 3720 return commit; 3721 } 3722 3723 /* Called to commit link state changes noted by inspection step of 3724 * active-backup mode ARP monitor. 3725 * 3726 * Called with RTNL hold. 3727 */ 3728 static void bond_ab_arp_commit(struct bonding *bond) 3729 { 3730 bool do_failover = false; 3731 struct list_head *iter; 3732 unsigned long last_tx; 3733 struct slave *slave; 3734 3735 bond_for_each_slave(bond, slave, iter) { 3736 switch (slave->link_new_state) { 3737 case BOND_LINK_NOCHANGE: 3738 continue; 3739 3740 case BOND_LINK_UP: 3741 last_tx = slave_last_tx(slave); 3742 if (rtnl_dereference(bond->curr_active_slave) != slave || 3743 (!rtnl_dereference(bond->curr_active_slave) && 3744 bond_time_in_interval(bond, last_tx, 1))) { 3745 struct slave *current_arp_slave; 3746 3747 current_arp_slave = rtnl_dereference(bond->current_arp_slave); 3748 bond_set_slave_link_state(slave, BOND_LINK_UP, 3749 BOND_SLAVE_NOTIFY_NOW); 3750 if (current_arp_slave) { 3751 bond_set_slave_inactive_flags( 3752 current_arp_slave, 3753 BOND_SLAVE_NOTIFY_NOW); 3754 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3755 } 3756 3757 slave_info(bond->dev, slave->dev, "link status definitely up\n"); 3758 3759 if (!rtnl_dereference(bond->curr_active_slave) || 3760 slave == rtnl_dereference(bond->primary_slave) || 3761 slave->prio > rtnl_dereference(bond->curr_active_slave)->prio) 3762 do_failover = true; 3763 3764 } 3765 3766 continue; 3767 3768 case BOND_LINK_DOWN: 3769 if (slave->link_failure_count < UINT_MAX) 3770 slave->link_failure_count++; 3771 3772 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3773 BOND_SLAVE_NOTIFY_NOW); 3774 bond_set_slave_inactive_flags(slave, 3775 BOND_SLAVE_NOTIFY_NOW); 3776 3777 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n"); 3778 3779 if (slave == rtnl_dereference(bond->curr_active_slave)) { 3780 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3781 do_failover = true; 3782 } 3783 3784 continue; 3785 3786 case BOND_LINK_FAIL: 3787 bond_set_slave_link_state(slave, BOND_LINK_FAIL, 3788 BOND_SLAVE_NOTIFY_NOW); 3789 bond_set_slave_inactive_flags(slave, 3790 BOND_SLAVE_NOTIFY_NOW); 3791 3792 /* A slave has just been enslaved and has become 3793 * the current active slave. 3794 */ 3795 if (rtnl_dereference(bond->curr_active_slave)) 3796 RCU_INIT_POINTER(bond->current_arp_slave, NULL); 3797 continue; 3798 3799 default: 3800 slave_err(bond->dev, slave->dev, 3801 "impossible: link_new_state %d on slave\n", 3802 slave->link_new_state); 3803 continue; 3804 } 3805 } 3806 3807 if (do_failover) { 3808 block_netpoll_tx(); 3809 bond_select_active_slave(bond); 3810 unblock_netpoll_tx(); 3811 } 3812 3813 bond_set_carrier(bond); 3814 } 3815 3816 /* Send ARP probes for active-backup mode ARP monitor. 3817 * 3818 * Called with rcu_read_lock held. 3819 */ 3820 static bool bond_ab_arp_probe(struct bonding *bond) 3821 { 3822 struct slave *slave, *before = NULL, *new_slave = NULL, 3823 *curr_arp_slave = rcu_dereference(bond->current_arp_slave), 3824 *curr_active_slave = rcu_dereference(bond->curr_active_slave); 3825 struct list_head *iter; 3826 bool found = false; 3827 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER; 3828 3829 if (curr_arp_slave && curr_active_slave) 3830 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n", 3831 curr_arp_slave->dev->name, 3832 curr_active_slave->dev->name); 3833 3834 if (curr_active_slave) { 3835 bond_send_validate(bond, curr_active_slave); 3836 return should_notify_rtnl; 3837 } 3838 3839 /* if we don't have a curr_active_slave, search for the next available 3840 * backup slave from the current_arp_slave and make it the candidate 3841 * for becoming the curr_active_slave 3842 */ 3843 3844 if (!curr_arp_slave) { 3845 curr_arp_slave = bond_first_slave_rcu(bond); 3846 if (!curr_arp_slave) 3847 return should_notify_rtnl; 3848 } 3849 3850 bond_for_each_slave_rcu(bond, slave, iter) { 3851 if (!found && !before && bond_slave_is_up(slave)) 3852 before = slave; 3853 3854 if (found && !new_slave && bond_slave_is_up(slave)) 3855 new_slave = slave; 3856 /* if the link state is up at this point, we 3857 * mark it down - this can happen if we have 3858 * simultaneous link failures and 3859 * reselect_active_interface doesn't make this 3860 * one the current slave so it is still marked 3861 * up when it is actually down 3862 */ 3863 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) { 3864 bond_set_slave_link_state(slave, BOND_LINK_DOWN, 3865 BOND_SLAVE_NOTIFY_LATER); 3866 if (slave->link_failure_count < UINT_MAX) 3867 slave->link_failure_count++; 3868 3869 bond_set_slave_inactive_flags(slave, 3870 BOND_SLAVE_NOTIFY_LATER); 3871 3872 slave_info(bond->dev, slave->dev, "backup interface is now down\n"); 3873 } 3874 if (slave == curr_arp_slave) 3875 found = true; 3876 } 3877 3878 if (!new_slave && before) 3879 new_slave = before; 3880 3881 if (!new_slave) 3882 goto check_state; 3883 3884 bond_set_slave_link_state(new_slave, BOND_LINK_BACK, 3885 BOND_SLAVE_NOTIFY_LATER); 3886 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER); 3887 bond_send_validate(bond, new_slave); 3888 new_slave->last_link_up = jiffies; 3889 rcu_assign_pointer(bond->current_arp_slave, new_slave); 3890 3891 check_state: 3892 bond_for_each_slave_rcu(bond, slave, iter) { 3893 if (slave->should_notify || slave->should_notify_link) { 3894 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW; 3895 break; 3896 } 3897 } 3898 return should_notify_rtnl; 3899 } 3900 3901 static void bond_activebackup_arp_mon(struct bonding *bond) 3902 { 3903 bool should_notify_peers = false; 3904 bool should_notify_rtnl = false; 3905 int delta_in_ticks; 3906 3907 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval); 3908 3909 if (!bond_has_slaves(bond)) 3910 goto re_arm; 3911 3912 rcu_read_lock(); 3913 3914 should_notify_peers = bond_should_notify_peers(bond); 3915 3916 if (bond_ab_arp_inspect(bond)) { 3917 rcu_read_unlock(); 3918 3919 /* Race avoidance with bond_close flush of workqueue */ 3920 if (!rtnl_trylock()) { 3921 delta_in_ticks = 1; 3922 should_notify_peers = false; 3923 goto re_arm; 3924 } 3925 3926 bond_ab_arp_commit(bond); 3927 3928 rtnl_unlock(); 3929 rcu_read_lock(); 3930 } 3931 3932 should_notify_rtnl = bond_ab_arp_probe(bond); 3933 rcu_read_unlock(); 3934 3935 re_arm: 3936 if (bond->params.arp_interval) 3937 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks); 3938 3939 if (should_notify_peers || should_notify_rtnl) { 3940 if (!rtnl_trylock()) 3941 return; 3942 3943 if (should_notify_peers) { 3944 bond->send_peer_notif--; 3945 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, 3946 bond->dev); 3947 } 3948 if (should_notify_rtnl) { 3949 bond_slave_state_notify(bond); 3950 bond_slave_link_notify(bond); 3951 } 3952 3953 rtnl_unlock(); 3954 } 3955 } 3956 3957 static void bond_arp_monitor(struct work_struct *work) 3958 { 3959 struct bonding *bond = container_of(work, struct bonding, 3960 arp_work.work); 3961 3962 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 3963 bond_activebackup_arp_mon(bond); 3964 else 3965 bond_loadbalance_arp_mon(bond); 3966 } 3967 3968 /*-------------------------- netdev event handling --------------------------*/ 3969 3970 /* Change device name */ 3971 static int bond_event_changename(struct bonding *bond) 3972 { 3973 bond_remove_proc_entry(bond); 3974 bond_create_proc_entry(bond); 3975 3976 bond_debug_reregister(bond); 3977 3978 return NOTIFY_DONE; 3979 } 3980 3981 static int bond_master_netdev_event(unsigned long event, 3982 struct net_device *bond_dev) 3983 { 3984 struct bonding *event_bond = netdev_priv(bond_dev); 3985 3986 netdev_dbg(bond_dev, "%s called\n", __func__); 3987 3988 switch (event) { 3989 case NETDEV_CHANGENAME: 3990 return bond_event_changename(event_bond); 3991 case NETDEV_UNREGISTER: 3992 bond_remove_proc_entry(event_bond); 3993 #ifdef CONFIG_XFRM_OFFLOAD 3994 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true); 3995 #endif /* CONFIG_XFRM_OFFLOAD */ 3996 break; 3997 case NETDEV_REGISTER: 3998 bond_create_proc_entry(event_bond); 3999 break; 4000 default: 4001 break; 4002 } 4003 4004 return NOTIFY_DONE; 4005 } 4006 4007 static int bond_slave_netdev_event(unsigned long event, 4008 struct net_device *slave_dev) 4009 { 4010 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary; 4011 struct bonding *bond; 4012 struct net_device *bond_dev; 4013 4014 /* A netdev event can be generated while enslaving a device 4015 * before netdev_rx_handler_register is called in which case 4016 * slave will be NULL 4017 */ 4018 if (!slave) { 4019 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__); 4020 return NOTIFY_DONE; 4021 } 4022 4023 bond_dev = slave->bond->dev; 4024 bond = slave->bond; 4025 primary = rtnl_dereference(bond->primary_slave); 4026 4027 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__); 4028 4029 switch (event) { 4030 case NETDEV_UNREGISTER: 4031 if (bond_dev->type != ARPHRD_ETHER) 4032 bond_release_and_destroy(bond_dev, slave_dev); 4033 else 4034 __bond_release_one(bond_dev, slave_dev, false, true); 4035 break; 4036 case NETDEV_UP: 4037 case NETDEV_CHANGE: 4038 /* For 802.3ad mode only: 4039 * Getting invalid Speed/Duplex values here will put slave 4040 * in weird state. Mark it as link-fail if the link was 4041 * previously up or link-down if it hasn't yet come up, and 4042 * let link-monitoring (miimon) set it right when correct 4043 * speeds/duplex are available. 4044 */ 4045 if (bond_update_speed_duplex(slave) && 4046 BOND_MODE(bond) == BOND_MODE_8023AD) { 4047 if (slave->last_link_up) 4048 slave->link = BOND_LINK_FAIL; 4049 else 4050 slave->link = BOND_LINK_DOWN; 4051 } 4052 4053 if (BOND_MODE(bond) == BOND_MODE_8023AD) 4054 bond_3ad_adapter_speed_duplex_changed(slave); 4055 fallthrough; 4056 case NETDEV_DOWN: 4057 /* Refresh slave-array if applicable! 4058 * If the setup does not use miimon or arpmon (mode-specific!), 4059 * then these events will not cause the slave-array to be 4060 * refreshed. This will cause xmit to use a slave that is not 4061 * usable. Avoid such situation by refeshing the array at these 4062 * events. If these (miimon/arpmon) parameters are configured 4063 * then array gets refreshed twice and that should be fine! 4064 */ 4065 if (bond_mode_can_use_xmit_hash(bond)) 4066 bond_update_slave_arr(bond, NULL); 4067 break; 4068 case NETDEV_CHANGEMTU: 4069 /* TODO: Should slaves be allowed to 4070 * independently alter their MTU? For 4071 * an active-backup bond, slaves need 4072 * not be the same type of device, so 4073 * MTUs may vary. For other modes, 4074 * slaves arguably should have the 4075 * same MTUs. To do this, we'd need to 4076 * take over the slave's change_mtu 4077 * function for the duration of their 4078 * servitude. 4079 */ 4080 break; 4081 case NETDEV_CHANGENAME: 4082 /* we don't care if we don't have primary set */ 4083 if (!bond_uses_primary(bond) || 4084 !bond->params.primary[0]) 4085 break; 4086 4087 if (slave == primary) { 4088 /* slave's name changed - he's no longer primary */ 4089 RCU_INIT_POINTER(bond->primary_slave, NULL); 4090 } else if (!strcmp(slave_dev->name, bond->params.primary)) { 4091 /* we have a new primary slave */ 4092 rcu_assign_pointer(bond->primary_slave, slave); 4093 } else { /* we didn't change primary - exit */ 4094 break; 4095 } 4096 4097 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n", 4098 primary ? slave_dev->name : "none"); 4099 4100 block_netpoll_tx(); 4101 bond_select_active_slave(bond); 4102 unblock_netpoll_tx(); 4103 break; 4104 case NETDEV_FEAT_CHANGE: 4105 if (!bond->notifier_ctx) { 4106 bond->notifier_ctx = true; 4107 bond_compute_features(bond); 4108 bond->notifier_ctx = false; 4109 } 4110 break; 4111 case NETDEV_RESEND_IGMP: 4112 /* Propagate to master device */ 4113 call_netdevice_notifiers(event, slave->bond->dev); 4114 break; 4115 case NETDEV_XDP_FEAT_CHANGE: 4116 bond_xdp_set_features(bond_dev); 4117 break; 4118 default: 4119 break; 4120 } 4121 4122 return NOTIFY_DONE; 4123 } 4124 4125 /* bond_netdev_event: handle netdev notifier chain events. 4126 * 4127 * This function receives events for the netdev chain. The caller (an 4128 * ioctl handler calling blocking_notifier_call_chain) holds the necessary 4129 * locks for us to safely manipulate the slave devices (RTNL lock, 4130 * dev_probe_lock). 4131 */ 4132 static int bond_netdev_event(struct notifier_block *this, 4133 unsigned long event, void *ptr) 4134 { 4135 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 4136 4137 netdev_dbg(event_dev, "%s received %s\n", 4138 __func__, netdev_cmd_to_name(event)); 4139 4140 if (!(event_dev->priv_flags & IFF_BONDING)) 4141 return NOTIFY_DONE; 4142 4143 if (event_dev->flags & IFF_MASTER) { 4144 int ret; 4145 4146 ret = bond_master_netdev_event(event, event_dev); 4147 if (ret != NOTIFY_DONE) 4148 return ret; 4149 } 4150 4151 if (event_dev->flags & IFF_SLAVE) 4152 return bond_slave_netdev_event(event, event_dev); 4153 4154 return NOTIFY_DONE; 4155 } 4156 4157 static struct notifier_block bond_netdev_notifier = { 4158 .notifier_call = bond_netdev_event, 4159 }; 4160 4161 /*---------------------------- Hashing Policies -----------------------------*/ 4162 4163 /* Helper to access data in a packet, with or without a backing skb. 4164 * If skb is given the data is linearized if necessary via pskb_may_pull. 4165 */ 4166 static inline const void *bond_pull_data(struct sk_buff *skb, 4167 const void *data, int hlen, int n) 4168 { 4169 if (likely(n <= hlen)) 4170 return data; 4171 else if (skb && likely(pskb_may_pull(skb, n))) 4172 return skb->data; 4173 4174 return NULL; 4175 } 4176 4177 /* L2 hash helper */ 4178 static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4179 { 4180 struct ethhdr *ep; 4181 4182 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4183 if (!data) 4184 return 0; 4185 4186 ep = (struct ethhdr *)(data + mhoff); 4187 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto); 4188 } 4189 4190 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data, 4191 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34) 4192 { 4193 const struct ipv6hdr *iph6; 4194 const struct iphdr *iph; 4195 4196 if (l2_proto == htons(ETH_P_IP)) { 4197 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph)); 4198 if (!data) 4199 return false; 4200 4201 iph = (const struct iphdr *)(data + *nhoff); 4202 iph_to_flow_copy_v4addrs(fk, iph); 4203 *nhoff += iph->ihl << 2; 4204 if (!ip_is_fragment(iph)) 4205 *ip_proto = iph->protocol; 4206 } else if (l2_proto == htons(ETH_P_IPV6)) { 4207 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6)); 4208 if (!data) 4209 return false; 4210 4211 iph6 = (const struct ipv6hdr *)(data + *nhoff); 4212 iph_to_flow_copy_v6addrs(fk, iph6); 4213 *nhoff += sizeof(*iph6); 4214 *ip_proto = iph6->nexthdr; 4215 } else { 4216 return false; 4217 } 4218 4219 if (l34 && *ip_proto >= 0) 4220 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen); 4221 4222 return true; 4223 } 4224 4225 static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen) 4226 { 4227 u32 srcmac_vendor = 0, srcmac_dev = 0; 4228 struct ethhdr *mac_hdr; 4229 u16 vlan = 0; 4230 int i; 4231 4232 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr)); 4233 if (!data) 4234 return 0; 4235 mac_hdr = (struct ethhdr *)(data + mhoff); 4236 4237 for (i = 0; i < 3; i++) 4238 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i]; 4239 4240 for (i = 3; i < ETH_ALEN; i++) 4241 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i]; 4242 4243 if (skb && skb_vlan_tag_present(skb)) 4244 vlan = skb_vlan_tag_get(skb); 4245 4246 return vlan ^ srcmac_vendor ^ srcmac_dev; 4247 } 4248 4249 /* Extract the appropriate headers based on bond's xmit policy */ 4250 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data, 4251 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk) 4252 { 4253 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34; 4254 int ip_proto = -1; 4255 4256 switch (bond->params.xmit_policy) { 4257 case BOND_XMIT_POLICY_ENCAP23: 4258 case BOND_XMIT_POLICY_ENCAP34: 4259 memset(fk, 0, sizeof(*fk)); 4260 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding, 4261 fk, data, l2_proto, nhoff, hlen, 0); 4262 default: 4263 break; 4264 } 4265 4266 fk->ports.ports = 0; 4267 memset(&fk->icmp, 0, sizeof(fk->icmp)); 4268 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34)) 4269 return false; 4270 4271 /* ICMP error packets contains at least 8 bytes of the header 4272 * of the packet which generated the error. Use this information 4273 * to correlate ICMP error packets within the same flow which 4274 * generated the error. 4275 */ 4276 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) { 4277 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen); 4278 if (ip_proto == IPPROTO_ICMP) { 4279 if (!icmp_is_err(fk->icmp.type)) 4280 return true; 4281 4282 nhoff += sizeof(struct icmphdr); 4283 } else if (ip_proto == IPPROTO_ICMPV6) { 4284 if (!icmpv6_is_err(fk->icmp.type)) 4285 return true; 4286 4287 nhoff += sizeof(struct icmp6hdr); 4288 } 4289 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34); 4290 } 4291 4292 return true; 4293 } 4294 4295 static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy) 4296 { 4297 hash ^= (__force u32)flow_get_u32_dst(flow) ^ 4298 (__force u32)flow_get_u32_src(flow); 4299 hash ^= (hash >> 16); 4300 hash ^= (hash >> 8); 4301 4302 /* discard lowest hash bit to deal with the common even ports pattern */ 4303 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 || 4304 xmit_policy == BOND_XMIT_POLICY_ENCAP34) 4305 return hash >> 1; 4306 4307 return hash; 4308 } 4309 4310 /* Generate hash based on xmit policy. If @skb is given it is used to linearize 4311 * the data as required, but this function can be used without it if the data is 4312 * known to be linear (e.g. with xdp_buff). 4313 */ 4314 static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data, 4315 __be16 l2_proto, int mhoff, int nhoff, int hlen) 4316 { 4317 struct flow_keys flow; 4318 u32 hash; 4319 4320 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC) 4321 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen); 4322 4323 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 || 4324 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow)) 4325 return bond_eth_hash(skb, data, mhoff, hlen); 4326 4327 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 || 4328 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) { 4329 hash = bond_eth_hash(skb, data, mhoff, hlen); 4330 } else { 4331 if (flow.icmp.id) 4332 memcpy(&hash, &flow.icmp, sizeof(hash)); 4333 else 4334 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 4335 } 4336 4337 return bond_ip_hash(hash, &flow, bond->params.xmit_policy); 4338 } 4339 4340 /** 4341 * bond_xmit_hash - generate a hash value based on the xmit policy 4342 * @bond: bonding device 4343 * @skb: buffer to use for headers 4344 * 4345 * This function will extract the necessary headers from the skb buffer and use 4346 * them to generate a hash based on the xmit_policy set in the bonding device 4347 */ 4348 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb) 4349 { 4350 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 && 4351 skb->l4_hash) 4352 return skb->hash; 4353 4354 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol, 4355 0, skb_network_offset(skb), 4356 skb_headlen(skb)); 4357 } 4358 4359 /** 4360 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy 4361 * @bond: bonding device 4362 * @xdp: buffer to use for headers 4363 * 4364 * The XDP variant of bond_xmit_hash. 4365 */ 4366 static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp) 4367 { 4368 struct ethhdr *eth; 4369 4370 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end) 4371 return 0; 4372 4373 eth = (struct ethhdr *)xdp->data; 4374 4375 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0, 4376 sizeof(struct ethhdr), xdp->data_end - xdp->data); 4377 } 4378 4379 /*-------------------------- Device entry points ----------------------------*/ 4380 4381 void bond_work_init_all(struct bonding *bond) 4382 { 4383 INIT_DELAYED_WORK(&bond->mcast_work, 4384 bond_resend_igmp_join_requests_delayed); 4385 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor); 4386 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor); 4387 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor); 4388 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler); 4389 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler); 4390 } 4391 4392 static void bond_work_cancel_all(struct bonding *bond) 4393 { 4394 cancel_delayed_work_sync(&bond->mii_work); 4395 cancel_delayed_work_sync(&bond->arp_work); 4396 cancel_delayed_work_sync(&bond->alb_work); 4397 cancel_delayed_work_sync(&bond->ad_work); 4398 cancel_delayed_work_sync(&bond->mcast_work); 4399 cancel_delayed_work_sync(&bond->slave_arr_work); 4400 } 4401 4402 static int bond_open(struct net_device *bond_dev) 4403 { 4404 struct bonding *bond = netdev_priv(bond_dev); 4405 struct list_head *iter; 4406 struct slave *slave; 4407 4408 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) { 4409 bond->rr_tx_counter = alloc_percpu(u32); 4410 if (!bond->rr_tx_counter) 4411 return -ENOMEM; 4412 } 4413 4414 /* reset slave->backup and slave->inactive */ 4415 if (bond_has_slaves(bond)) { 4416 bond_for_each_slave(bond, slave, iter) { 4417 if (bond_uses_primary(bond) && 4418 slave != rcu_access_pointer(bond->curr_active_slave)) { 4419 bond_set_slave_inactive_flags(slave, 4420 BOND_SLAVE_NOTIFY_NOW); 4421 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) { 4422 bond_set_slave_active_flags(slave, 4423 BOND_SLAVE_NOTIFY_NOW); 4424 } 4425 } 4426 } 4427 4428 if (bond_is_lb(bond)) { 4429 /* bond_alb_initialize must be called before the timer 4430 * is started. 4431 */ 4432 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB))) 4433 return -ENOMEM; 4434 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB) 4435 queue_delayed_work(bond->wq, &bond->alb_work, 0); 4436 } 4437 4438 if (bond->params.miimon) /* link check interval, in milliseconds. */ 4439 queue_delayed_work(bond->wq, &bond->mii_work, 0); 4440 4441 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */ 4442 queue_delayed_work(bond->wq, &bond->arp_work, 0); 4443 bond->recv_probe = bond_rcv_validate; 4444 } 4445 4446 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 4447 queue_delayed_work(bond->wq, &bond->ad_work, 0); 4448 /* register to receive LACPDUs */ 4449 bond->recv_probe = bond_3ad_lacpdu_recv; 4450 bond_3ad_initiate_agg_selection(bond, 1); 4451 4452 bond_for_each_slave(bond, slave, iter) 4453 dev_mc_add(slave->dev, lacpdu_mcast_addr); 4454 } 4455 4456 if (bond_mode_can_use_xmit_hash(bond)) 4457 bond_update_slave_arr(bond, NULL); 4458 4459 return 0; 4460 } 4461 4462 static int bond_close(struct net_device *bond_dev) 4463 { 4464 struct bonding *bond = netdev_priv(bond_dev); 4465 struct slave *slave; 4466 4467 bond_work_cancel_all(bond); 4468 bond->send_peer_notif = 0; 4469 if (bond_is_lb(bond)) 4470 bond_alb_deinitialize(bond); 4471 bond->recv_probe = NULL; 4472 4473 if (bond_uses_primary(bond)) { 4474 rcu_read_lock(); 4475 slave = rcu_dereference(bond->curr_active_slave); 4476 if (slave) 4477 bond_hw_addr_flush(bond_dev, slave->dev); 4478 rcu_read_unlock(); 4479 } else { 4480 struct list_head *iter; 4481 4482 bond_for_each_slave(bond, slave, iter) 4483 bond_hw_addr_flush(bond_dev, slave->dev); 4484 } 4485 4486 return 0; 4487 } 4488 4489 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but 4490 * that some drivers can provide 32bit values only. 4491 */ 4492 static void bond_fold_stats(struct rtnl_link_stats64 *_res, 4493 const struct rtnl_link_stats64 *_new, 4494 const struct rtnl_link_stats64 *_old) 4495 { 4496 const u64 *new = (const u64 *)_new; 4497 const u64 *old = (const u64 *)_old; 4498 u64 *res = (u64 *)_res; 4499 int i; 4500 4501 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) { 4502 u64 nv = new[i]; 4503 u64 ov = old[i]; 4504 s64 delta = nv - ov; 4505 4506 /* detects if this particular field is 32bit only */ 4507 if (((nv | ov) >> 32) == 0) 4508 delta = (s64)(s32)((u32)nv - (u32)ov); 4509 4510 /* filter anomalies, some drivers reset their stats 4511 * at down/up events. 4512 */ 4513 if (delta > 0) 4514 res[i] += delta; 4515 } 4516 } 4517 4518 #ifdef CONFIG_LOCKDEP 4519 static int bond_get_lowest_level_rcu(struct net_device *dev) 4520 { 4521 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; 4522 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; 4523 int cur = 0, max = 0; 4524 4525 now = dev; 4526 iter = &dev->adj_list.lower; 4527 4528 while (1) { 4529 next = NULL; 4530 while (1) { 4531 ldev = netdev_next_lower_dev_rcu(now, &iter); 4532 if (!ldev) 4533 break; 4534 4535 next = ldev; 4536 niter = &ldev->adj_list.lower; 4537 dev_stack[cur] = now; 4538 iter_stack[cur++] = iter; 4539 if (max <= cur) 4540 max = cur; 4541 break; 4542 } 4543 4544 if (!next) { 4545 if (!cur) 4546 return max; 4547 next = dev_stack[--cur]; 4548 niter = iter_stack[cur]; 4549 } 4550 4551 now = next; 4552 iter = niter; 4553 } 4554 4555 return max; 4556 } 4557 #endif 4558 4559 static void bond_get_stats(struct net_device *bond_dev, 4560 struct rtnl_link_stats64 *stats) 4561 { 4562 struct bonding *bond = netdev_priv(bond_dev); 4563 struct rtnl_link_stats64 temp; 4564 struct list_head *iter; 4565 struct slave *slave; 4566 int nest_level = 0; 4567 4568 4569 rcu_read_lock(); 4570 #ifdef CONFIG_LOCKDEP 4571 nest_level = bond_get_lowest_level_rcu(bond_dev); 4572 #endif 4573 4574 spin_lock_nested(&bond->stats_lock, nest_level); 4575 memcpy(stats, &bond->bond_stats, sizeof(*stats)); 4576 4577 bond_for_each_slave_rcu(bond, slave, iter) { 4578 const struct rtnl_link_stats64 *new = 4579 dev_get_stats(slave->dev, &temp); 4580 4581 bond_fold_stats(stats, new, &slave->slave_stats); 4582 4583 /* save off the slave stats for the next run */ 4584 memcpy(&slave->slave_stats, new, sizeof(*new)); 4585 } 4586 4587 memcpy(&bond->bond_stats, stats, sizeof(*stats)); 4588 spin_unlock(&bond->stats_lock); 4589 rcu_read_unlock(); 4590 } 4591 4592 static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4593 { 4594 struct bonding *bond = netdev_priv(bond_dev); 4595 struct mii_ioctl_data *mii = NULL; 4596 4597 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd); 4598 4599 switch (cmd) { 4600 case SIOCGMIIPHY: 4601 mii = if_mii(ifr); 4602 if (!mii) 4603 return -EINVAL; 4604 4605 mii->phy_id = 0; 4606 fallthrough; 4607 case SIOCGMIIREG: 4608 /* We do this again just in case we were called by SIOCGMIIREG 4609 * instead of SIOCGMIIPHY. 4610 */ 4611 mii = if_mii(ifr); 4612 if (!mii) 4613 return -EINVAL; 4614 4615 if (mii->reg_num == 1) { 4616 mii->val_out = 0; 4617 if (netif_carrier_ok(bond->dev)) 4618 mii->val_out = BMSR_LSTATUS; 4619 } 4620 4621 break; 4622 default: 4623 return -EOPNOTSUPP; 4624 } 4625 4626 return 0; 4627 } 4628 4629 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd) 4630 { 4631 struct bonding *bond = netdev_priv(bond_dev); 4632 struct net_device *slave_dev = NULL; 4633 struct ifbond k_binfo; 4634 struct ifbond __user *u_binfo = NULL; 4635 struct ifslave k_sinfo; 4636 struct ifslave __user *u_sinfo = NULL; 4637 struct bond_opt_value newval; 4638 struct net *net; 4639 int res = 0; 4640 4641 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd); 4642 4643 switch (cmd) { 4644 case SIOCBONDINFOQUERY: 4645 u_binfo = (struct ifbond __user *)ifr->ifr_data; 4646 4647 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) 4648 return -EFAULT; 4649 4650 bond_info_query(bond_dev, &k_binfo); 4651 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) 4652 return -EFAULT; 4653 4654 return 0; 4655 case SIOCBONDSLAVEINFOQUERY: 4656 u_sinfo = (struct ifslave __user *)ifr->ifr_data; 4657 4658 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) 4659 return -EFAULT; 4660 4661 res = bond_slave_info_query(bond_dev, &k_sinfo); 4662 if (res == 0 && 4663 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) 4664 return -EFAULT; 4665 4666 return res; 4667 default: 4668 break; 4669 } 4670 4671 net = dev_net(bond_dev); 4672 4673 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 4674 return -EPERM; 4675 4676 slave_dev = __dev_get_by_name(net, ifr->ifr_slave); 4677 4678 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev); 4679 4680 if (!slave_dev) 4681 return -ENODEV; 4682 4683 switch (cmd) { 4684 case SIOCBONDENSLAVE: 4685 res = bond_enslave(bond_dev, slave_dev, NULL); 4686 break; 4687 case SIOCBONDRELEASE: 4688 res = bond_release(bond_dev, slave_dev); 4689 break; 4690 case SIOCBONDSETHWADDR: 4691 res = bond_set_dev_addr(bond_dev, slave_dev); 4692 break; 4693 case SIOCBONDCHANGEACTIVE: 4694 bond_opt_initstr(&newval, slave_dev->name); 4695 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE, 4696 &newval); 4697 break; 4698 default: 4699 res = -EOPNOTSUPP; 4700 } 4701 4702 return res; 4703 } 4704 4705 static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr, 4706 void __user *data, int cmd) 4707 { 4708 struct ifreq ifrdata = { .ifr_data = data }; 4709 4710 switch (cmd) { 4711 case BOND_INFO_QUERY_OLD: 4712 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY); 4713 case BOND_SLAVE_INFO_QUERY_OLD: 4714 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY); 4715 case BOND_ENSLAVE_OLD: 4716 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE); 4717 case BOND_RELEASE_OLD: 4718 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE); 4719 case BOND_SETHWADDR_OLD: 4720 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR); 4721 case BOND_CHANGE_ACTIVE_OLD: 4722 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE); 4723 } 4724 4725 return -EOPNOTSUPP; 4726 } 4727 4728 static void bond_change_rx_flags(struct net_device *bond_dev, int change) 4729 { 4730 struct bonding *bond = netdev_priv(bond_dev); 4731 4732 if (change & IFF_PROMISC) 4733 bond_set_promiscuity(bond, 4734 bond_dev->flags & IFF_PROMISC ? 1 : -1); 4735 4736 if (change & IFF_ALLMULTI) 4737 bond_set_allmulti(bond, 4738 bond_dev->flags & IFF_ALLMULTI ? 1 : -1); 4739 } 4740 4741 static void bond_set_rx_mode(struct net_device *bond_dev) 4742 { 4743 struct bonding *bond = netdev_priv(bond_dev); 4744 struct list_head *iter; 4745 struct slave *slave; 4746 4747 rcu_read_lock(); 4748 if (bond_uses_primary(bond)) { 4749 slave = rcu_dereference(bond->curr_active_slave); 4750 if (slave) { 4751 dev_uc_sync(slave->dev, bond_dev); 4752 dev_mc_sync(slave->dev, bond_dev); 4753 } 4754 } else { 4755 bond_for_each_slave_rcu(bond, slave, iter) { 4756 dev_uc_sync_multiple(slave->dev, bond_dev); 4757 dev_mc_sync_multiple(slave->dev, bond_dev); 4758 } 4759 } 4760 rcu_read_unlock(); 4761 } 4762 4763 static int bond_neigh_init(struct neighbour *n) 4764 { 4765 struct bonding *bond = netdev_priv(n->dev); 4766 const struct net_device_ops *slave_ops; 4767 struct neigh_parms parms; 4768 struct slave *slave; 4769 int ret = 0; 4770 4771 rcu_read_lock(); 4772 slave = bond_first_slave_rcu(bond); 4773 if (!slave) 4774 goto out; 4775 slave_ops = slave->dev->netdev_ops; 4776 if (!slave_ops->ndo_neigh_setup) 4777 goto out; 4778 4779 /* TODO: find another way [1] to implement this. 4780 * Passing a zeroed structure is fragile, 4781 * but at least we do not pass garbage. 4782 * 4783 * [1] One way would be that ndo_neigh_setup() never touch 4784 * struct neigh_parms, but propagate the new neigh_setup() 4785 * back to ___neigh_create() / neigh_parms_alloc() 4786 */ 4787 memset(&parms, 0, sizeof(parms)); 4788 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms); 4789 4790 if (ret) 4791 goto out; 4792 4793 if (parms.neigh_setup) 4794 ret = parms.neigh_setup(n); 4795 out: 4796 rcu_read_unlock(); 4797 return ret; 4798 } 4799 4800 /* The bonding ndo_neigh_setup is called at init time beofre any 4801 * slave exists. So we must declare proxy setup function which will 4802 * be used at run time to resolve the actual slave neigh param setup. 4803 * 4804 * It's also called by master devices (such as vlans) to setup their 4805 * underlying devices. In that case - do nothing, we're already set up from 4806 * our init. 4807 */ 4808 static int bond_neigh_setup(struct net_device *dev, 4809 struct neigh_parms *parms) 4810 { 4811 /* modify only our neigh_parms */ 4812 if (parms->dev == dev) 4813 parms->neigh_setup = bond_neigh_init; 4814 4815 return 0; 4816 } 4817 4818 /* Change the MTU of all of a master's slaves to match the master */ 4819 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu) 4820 { 4821 struct bonding *bond = netdev_priv(bond_dev); 4822 struct slave *slave, *rollback_slave; 4823 struct list_head *iter; 4824 int res = 0; 4825 4826 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu); 4827 4828 bond_for_each_slave(bond, slave, iter) { 4829 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n", 4830 slave, slave->dev->netdev_ops->ndo_change_mtu); 4831 4832 res = dev_set_mtu(slave->dev, new_mtu); 4833 4834 if (res) { 4835 /* If we failed to set the slave's mtu to the new value 4836 * we must abort the operation even in ACTIVE_BACKUP 4837 * mode, because if we allow the backup slaves to have 4838 * different mtu values than the active slave we'll 4839 * need to change their mtu when doing a failover. That 4840 * means changing their mtu from timer context, which 4841 * is probably not a good idea. 4842 */ 4843 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n", 4844 res, new_mtu); 4845 goto unwind; 4846 } 4847 } 4848 4849 WRITE_ONCE(bond_dev->mtu, new_mtu); 4850 4851 return 0; 4852 4853 unwind: 4854 /* unwind from head to the slave that failed */ 4855 bond_for_each_slave(bond, rollback_slave, iter) { 4856 int tmp_res; 4857 4858 if (rollback_slave == slave) 4859 break; 4860 4861 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu); 4862 if (tmp_res) 4863 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n", 4864 tmp_res); 4865 } 4866 4867 return res; 4868 } 4869 4870 /* Change HW address 4871 * 4872 * Note that many devices must be down to change the HW address, and 4873 * downing the master releases all slaves. We can make bonds full of 4874 * bonding devices to test this, however. 4875 */ 4876 static int bond_set_mac_address(struct net_device *bond_dev, void *addr) 4877 { 4878 struct bonding *bond = netdev_priv(bond_dev); 4879 struct slave *slave, *rollback_slave; 4880 struct sockaddr_storage *ss = addr, tmp_ss; 4881 struct list_head *iter; 4882 int res = 0; 4883 4884 if (BOND_MODE(bond) == BOND_MODE_ALB) 4885 return bond_alb_set_mac_address(bond_dev, addr); 4886 4887 4888 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond); 4889 4890 /* If fail_over_mac is enabled, do nothing and return success. 4891 * Returning an error causes ifenslave to fail. 4892 */ 4893 if (bond->params.fail_over_mac && 4894 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 4895 return 0; 4896 4897 if (!is_valid_ether_addr(ss->__data)) 4898 return -EADDRNOTAVAIL; 4899 4900 bond_for_each_slave(bond, slave, iter) { 4901 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n", 4902 __func__, slave); 4903 res = dev_set_mac_address(slave->dev, addr, NULL); 4904 if (res) { 4905 /* TODO: consider downing the slave 4906 * and retry ? 4907 * User should expect communications 4908 * breakage anyway until ARP finish 4909 * updating, so... 4910 */ 4911 slave_dbg(bond_dev, slave->dev, "%s: err %d\n", 4912 __func__, res); 4913 goto unwind; 4914 } 4915 } 4916 4917 /* success */ 4918 dev_addr_set(bond_dev, ss->__data); 4919 return 0; 4920 4921 unwind: 4922 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len); 4923 tmp_ss.ss_family = bond_dev->type; 4924 4925 /* unwind from head to the slave that failed */ 4926 bond_for_each_slave(bond, rollback_slave, iter) { 4927 int tmp_res; 4928 4929 if (rollback_slave == slave) 4930 break; 4931 4932 tmp_res = dev_set_mac_address(rollback_slave->dev, 4933 (struct sockaddr *)&tmp_ss, NULL); 4934 if (tmp_res) { 4935 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n", 4936 __func__, tmp_res); 4937 } 4938 } 4939 4940 return res; 4941 } 4942 4943 /** 4944 * bond_get_slave_by_id - get xmit slave with slave_id 4945 * @bond: bonding device that is transmitting 4946 * @slave_id: slave id up to slave_cnt-1 through which to transmit 4947 * 4948 * This function tries to get slave with slave_id but in case 4949 * it fails, it tries to find the first available slave for transmission. 4950 */ 4951 static struct slave *bond_get_slave_by_id(struct bonding *bond, 4952 int slave_id) 4953 { 4954 struct list_head *iter; 4955 struct slave *slave; 4956 int i = slave_id; 4957 4958 /* Here we start from the slave with slave_id */ 4959 bond_for_each_slave_rcu(bond, slave, iter) { 4960 if (--i < 0) { 4961 if (bond_slave_can_tx(slave)) 4962 return slave; 4963 } 4964 } 4965 4966 /* Here we start from the first slave up to slave_id */ 4967 i = slave_id; 4968 bond_for_each_slave_rcu(bond, slave, iter) { 4969 if (--i < 0) 4970 break; 4971 if (bond_slave_can_tx(slave)) 4972 return slave; 4973 } 4974 /* no slave that can tx has been found */ 4975 return NULL; 4976 } 4977 4978 /** 4979 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave 4980 * @bond: bonding device to use 4981 * 4982 * Based on the value of the bonding device's packets_per_slave parameter 4983 * this function generates a slave id, which is usually used as the next 4984 * slave to transmit through. 4985 */ 4986 static u32 bond_rr_gen_slave_id(struct bonding *bond) 4987 { 4988 u32 slave_id; 4989 struct reciprocal_value reciprocal_packets_per_slave; 4990 int packets_per_slave = bond->params.packets_per_slave; 4991 4992 switch (packets_per_slave) { 4993 case 0: 4994 slave_id = get_random_u32(); 4995 break; 4996 case 1: 4997 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 4998 break; 4999 default: 5000 reciprocal_packets_per_slave = 5001 bond->params.reciprocal_packets_per_slave; 5002 slave_id = this_cpu_inc_return(*bond->rr_tx_counter); 5003 slave_id = reciprocal_divide(slave_id, 5004 reciprocal_packets_per_slave); 5005 break; 5006 } 5007 5008 return slave_id; 5009 } 5010 5011 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond, 5012 struct sk_buff *skb) 5013 { 5014 struct slave *slave; 5015 int slave_cnt; 5016 u32 slave_id; 5017 5018 /* Start with the curr_active_slave that joined the bond as the 5019 * default for sending IGMP traffic. For failover purposes one 5020 * needs to maintain some consistency for the interface that will 5021 * send the join/membership reports. The curr_active_slave found 5022 * will send all of this type of traffic. 5023 */ 5024 if (skb->protocol == htons(ETH_P_IP)) { 5025 int noff = skb_network_offset(skb); 5026 struct iphdr *iph; 5027 5028 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph)))) 5029 goto non_igmp; 5030 5031 iph = ip_hdr(skb); 5032 if (iph->protocol == IPPROTO_IGMP) { 5033 slave = rcu_dereference(bond->curr_active_slave); 5034 if (slave) 5035 return slave; 5036 return bond_get_slave_by_id(bond, 0); 5037 } 5038 } 5039 5040 non_igmp: 5041 slave_cnt = READ_ONCE(bond->slave_cnt); 5042 if (likely(slave_cnt)) { 5043 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 5044 return bond_get_slave_by_id(bond, slave_id); 5045 } 5046 return NULL; 5047 } 5048 5049 static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond, 5050 struct xdp_buff *xdp) 5051 { 5052 struct slave *slave; 5053 int slave_cnt; 5054 u32 slave_id; 5055 const struct ethhdr *eth; 5056 void *data = xdp->data; 5057 5058 if (data + sizeof(struct ethhdr) > xdp->data_end) 5059 goto non_igmp; 5060 5061 eth = (struct ethhdr *)data; 5062 data += sizeof(struct ethhdr); 5063 5064 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */ 5065 if (eth->h_proto == htons(ETH_P_IP)) { 5066 const struct iphdr *iph; 5067 5068 if (data + sizeof(struct iphdr) > xdp->data_end) 5069 goto non_igmp; 5070 5071 iph = (struct iphdr *)data; 5072 5073 if (iph->protocol == IPPROTO_IGMP) { 5074 slave = rcu_dereference(bond->curr_active_slave); 5075 if (slave) 5076 return slave; 5077 return bond_get_slave_by_id(bond, 0); 5078 } 5079 } 5080 5081 non_igmp: 5082 slave_cnt = READ_ONCE(bond->slave_cnt); 5083 if (likely(slave_cnt)) { 5084 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt; 5085 return bond_get_slave_by_id(bond, slave_id); 5086 } 5087 return NULL; 5088 } 5089 5090 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb, 5091 struct net_device *bond_dev) 5092 { 5093 struct bonding *bond = netdev_priv(bond_dev); 5094 struct slave *slave; 5095 5096 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5097 if (likely(slave)) 5098 return bond_dev_queue_xmit(bond, skb, slave->dev); 5099 5100 return bond_tx_drop(bond_dev, skb); 5101 } 5102 5103 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond) 5104 { 5105 return rcu_dereference(bond->curr_active_slave); 5106 } 5107 5108 /* In active-backup mode, we know that bond->curr_active_slave is always valid if 5109 * the bond has a usable interface. 5110 */ 5111 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb, 5112 struct net_device *bond_dev) 5113 { 5114 struct bonding *bond = netdev_priv(bond_dev); 5115 struct slave *slave; 5116 5117 slave = bond_xmit_activebackup_slave_get(bond); 5118 if (slave) 5119 return bond_dev_queue_xmit(bond, skb, slave->dev); 5120 5121 return bond_tx_drop(bond_dev, skb); 5122 } 5123 5124 /* Use this to update slave_array when (a) it's not appropriate to update 5125 * slave_array right away (note that update_slave_array() may sleep) 5126 * and / or (b) RTNL is not held. 5127 */ 5128 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay) 5129 { 5130 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay); 5131 } 5132 5133 /* Slave array work handler. Holds only RTNL */ 5134 static void bond_slave_arr_handler(struct work_struct *work) 5135 { 5136 struct bonding *bond = container_of(work, struct bonding, 5137 slave_arr_work.work); 5138 int ret; 5139 5140 if (!rtnl_trylock()) 5141 goto err; 5142 5143 ret = bond_update_slave_arr(bond, NULL); 5144 rtnl_unlock(); 5145 if (ret) { 5146 pr_warn_ratelimited("Failed to update slave array from WT\n"); 5147 goto err; 5148 } 5149 return; 5150 5151 err: 5152 bond_slave_arr_work_rearm(bond, 1); 5153 } 5154 5155 static void bond_skip_slave(struct bond_up_slave *slaves, 5156 struct slave *skipslave) 5157 { 5158 int idx; 5159 5160 /* Rare situation where caller has asked to skip a specific 5161 * slave but allocation failed (most likely!). BTW this is 5162 * only possible when the call is initiated from 5163 * __bond_release_one(). In this situation; overwrite the 5164 * skipslave entry in the array with the last entry from the 5165 * array to avoid a situation where the xmit path may choose 5166 * this to-be-skipped slave to send a packet out. 5167 */ 5168 for (idx = 0; slaves && idx < slaves->count; idx++) { 5169 if (skipslave == slaves->arr[idx]) { 5170 slaves->arr[idx] = 5171 slaves->arr[slaves->count - 1]; 5172 slaves->count--; 5173 break; 5174 } 5175 } 5176 } 5177 5178 static void bond_set_slave_arr(struct bonding *bond, 5179 struct bond_up_slave *usable_slaves, 5180 struct bond_up_slave *all_slaves) 5181 { 5182 struct bond_up_slave *usable, *all; 5183 5184 usable = rtnl_dereference(bond->usable_slaves); 5185 rcu_assign_pointer(bond->usable_slaves, usable_slaves); 5186 kfree_rcu(usable, rcu); 5187 5188 all = rtnl_dereference(bond->all_slaves); 5189 rcu_assign_pointer(bond->all_slaves, all_slaves); 5190 kfree_rcu(all, rcu); 5191 } 5192 5193 static void bond_reset_slave_arr(struct bonding *bond) 5194 { 5195 bond_set_slave_arr(bond, NULL, NULL); 5196 } 5197 5198 /* Build the usable slaves array in control path for modes that use xmit-hash 5199 * to determine the slave interface - 5200 * (a) BOND_MODE_8023AD 5201 * (b) BOND_MODE_XOR 5202 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0 5203 * 5204 * The caller is expected to hold RTNL only and NO other lock! 5205 */ 5206 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave) 5207 { 5208 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL; 5209 struct slave *slave; 5210 struct list_head *iter; 5211 int agg_id = 0; 5212 int ret = 0; 5213 5214 might_sleep(); 5215 5216 usable_slaves = kzalloc(struct_size(usable_slaves, arr, 5217 bond->slave_cnt), GFP_KERNEL); 5218 all_slaves = kzalloc(struct_size(all_slaves, arr, 5219 bond->slave_cnt), GFP_KERNEL); 5220 if (!usable_slaves || !all_slaves) { 5221 ret = -ENOMEM; 5222 goto out; 5223 } 5224 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5225 struct ad_info ad_info; 5226 5227 spin_lock_bh(&bond->mode_lock); 5228 if (bond_3ad_get_active_agg_info(bond, &ad_info)) { 5229 spin_unlock_bh(&bond->mode_lock); 5230 pr_debug("bond_3ad_get_active_agg_info failed\n"); 5231 /* No active aggragator means it's not safe to use 5232 * the previous array. 5233 */ 5234 bond_reset_slave_arr(bond); 5235 goto out; 5236 } 5237 spin_unlock_bh(&bond->mode_lock); 5238 agg_id = ad_info.aggregator_id; 5239 } 5240 bond_for_each_slave(bond, slave, iter) { 5241 if (skipslave == slave) 5242 continue; 5243 5244 all_slaves->arr[all_slaves->count++] = slave; 5245 if (BOND_MODE(bond) == BOND_MODE_8023AD) { 5246 struct aggregator *agg; 5247 5248 agg = SLAVE_AD_INFO(slave)->port.aggregator; 5249 if (!agg || agg->aggregator_identifier != agg_id) 5250 continue; 5251 } 5252 if (!bond_slave_can_tx(slave)) 5253 continue; 5254 5255 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n", 5256 usable_slaves->count); 5257 5258 usable_slaves->arr[usable_slaves->count++] = slave; 5259 } 5260 5261 bond_set_slave_arr(bond, usable_slaves, all_slaves); 5262 return ret; 5263 out: 5264 if (ret != 0 && skipslave) { 5265 bond_skip_slave(rtnl_dereference(bond->all_slaves), 5266 skipslave); 5267 bond_skip_slave(rtnl_dereference(bond->usable_slaves), 5268 skipslave); 5269 } 5270 kfree_rcu(all_slaves, rcu); 5271 kfree_rcu(usable_slaves, rcu); 5272 5273 return ret; 5274 } 5275 5276 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond, 5277 struct sk_buff *skb, 5278 struct bond_up_slave *slaves) 5279 { 5280 struct slave *slave; 5281 unsigned int count; 5282 u32 hash; 5283 5284 hash = bond_xmit_hash(bond, skb); 5285 count = slaves ? READ_ONCE(slaves->count) : 0; 5286 if (unlikely(!count)) 5287 return NULL; 5288 5289 slave = slaves->arr[hash % count]; 5290 return slave; 5291 } 5292 5293 static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond, 5294 struct xdp_buff *xdp) 5295 { 5296 struct bond_up_slave *slaves; 5297 unsigned int count; 5298 u32 hash; 5299 5300 hash = bond_xmit_hash_xdp(bond, xdp); 5301 slaves = rcu_dereference(bond->usable_slaves); 5302 count = slaves ? READ_ONCE(slaves->count) : 0; 5303 if (unlikely(!count)) 5304 return NULL; 5305 5306 return slaves->arr[hash % count]; 5307 } 5308 5309 /* Use this Xmit function for 3AD as well as XOR modes. The current 5310 * usable slave array is formed in the control path. The xmit function 5311 * just calculates hash and sends the packet out. 5312 */ 5313 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb, 5314 struct net_device *dev) 5315 { 5316 struct bonding *bond = netdev_priv(dev); 5317 struct bond_up_slave *slaves; 5318 struct slave *slave; 5319 5320 slaves = rcu_dereference(bond->usable_slaves); 5321 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5322 if (likely(slave)) 5323 return bond_dev_queue_xmit(bond, skb, slave->dev); 5324 5325 return bond_tx_drop(dev, skb); 5326 } 5327 5328 /* in broadcast mode, we send everything to all usable interfaces. */ 5329 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb, 5330 struct net_device *bond_dev) 5331 { 5332 struct bonding *bond = netdev_priv(bond_dev); 5333 struct slave *slave = NULL; 5334 struct list_head *iter; 5335 bool xmit_suc = false; 5336 bool skb_used = false; 5337 5338 bond_for_each_slave_rcu(bond, slave, iter) { 5339 struct sk_buff *skb2; 5340 5341 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)) 5342 continue; 5343 5344 if (bond_is_last_slave(bond, slave)) { 5345 skb2 = skb; 5346 skb_used = true; 5347 } else { 5348 skb2 = skb_clone(skb, GFP_ATOMIC); 5349 if (!skb2) { 5350 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n", 5351 bond_dev->name, __func__); 5352 continue; 5353 } 5354 } 5355 5356 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK) 5357 xmit_suc = true; 5358 } 5359 5360 if (!skb_used) 5361 dev_kfree_skb_any(skb); 5362 5363 if (xmit_suc) 5364 return NETDEV_TX_OK; 5365 5366 dev_core_stats_tx_dropped_inc(bond_dev); 5367 return NET_XMIT_DROP; 5368 } 5369 5370 /*------------------------- Device initialization ---------------------------*/ 5371 5372 /* Lookup the slave that corresponds to a qid */ 5373 static inline int bond_slave_override(struct bonding *bond, 5374 struct sk_buff *skb) 5375 { 5376 struct slave *slave = NULL; 5377 struct list_head *iter; 5378 5379 if (!skb_rx_queue_recorded(skb)) 5380 return 1; 5381 5382 /* Find out if any slaves have the same mapping as this skb. */ 5383 bond_for_each_slave_rcu(bond, slave, iter) { 5384 if (READ_ONCE(slave->queue_id) == skb_get_queue_mapping(skb)) { 5385 if (bond_slave_is_up(slave) && 5386 slave->link == BOND_LINK_UP) { 5387 bond_dev_queue_xmit(bond, skb, slave->dev); 5388 return 0; 5389 } 5390 /* If the slave isn't UP, use default transmit policy. */ 5391 break; 5392 } 5393 } 5394 5395 return 1; 5396 } 5397 5398 5399 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb, 5400 struct net_device *sb_dev) 5401 { 5402 /* This helper function exists to help dev_pick_tx get the correct 5403 * destination queue. Using a helper function skips a call to 5404 * skb_tx_hash and will put the skbs in the queue we expect on their 5405 * way down to the bonding driver. 5406 */ 5407 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0; 5408 5409 /* Save the original txq to restore before passing to the driver */ 5410 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb); 5411 5412 if (unlikely(txq >= dev->real_num_tx_queues)) { 5413 do { 5414 txq -= dev->real_num_tx_queues; 5415 } while (txq >= dev->real_num_tx_queues); 5416 } 5417 return txq; 5418 } 5419 5420 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev, 5421 struct sk_buff *skb, 5422 bool all_slaves) 5423 { 5424 struct bonding *bond = netdev_priv(master_dev); 5425 struct bond_up_slave *slaves; 5426 struct slave *slave = NULL; 5427 5428 switch (BOND_MODE(bond)) { 5429 case BOND_MODE_ROUNDROBIN: 5430 slave = bond_xmit_roundrobin_slave_get(bond, skb); 5431 break; 5432 case BOND_MODE_ACTIVEBACKUP: 5433 slave = bond_xmit_activebackup_slave_get(bond); 5434 break; 5435 case BOND_MODE_8023AD: 5436 case BOND_MODE_XOR: 5437 if (all_slaves) 5438 slaves = rcu_dereference(bond->all_slaves); 5439 else 5440 slaves = rcu_dereference(bond->usable_slaves); 5441 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves); 5442 break; 5443 case BOND_MODE_BROADCAST: 5444 break; 5445 case BOND_MODE_ALB: 5446 slave = bond_xmit_alb_slave_get(bond, skb); 5447 break; 5448 case BOND_MODE_TLB: 5449 slave = bond_xmit_tlb_slave_get(bond, skb); 5450 break; 5451 default: 5452 /* Should never happen, mode already checked */ 5453 WARN_ONCE(true, "Unknown bonding mode"); 5454 break; 5455 } 5456 5457 if (slave) 5458 return slave->dev; 5459 return NULL; 5460 } 5461 5462 static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow) 5463 { 5464 switch (sk->sk_family) { 5465 #if IS_ENABLED(CONFIG_IPV6) 5466 case AF_INET6: 5467 if (ipv6_only_sock(sk) || 5468 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) { 5469 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; 5470 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr; 5471 flow->addrs.v6addrs.dst = sk->sk_v6_daddr; 5472 break; 5473 } 5474 fallthrough; 5475 #endif 5476 default: /* AF_INET */ 5477 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 5478 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr; 5479 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr; 5480 break; 5481 } 5482 5483 flow->ports.src = inet_sk(sk)->inet_sport; 5484 flow->ports.dst = inet_sk(sk)->inet_dport; 5485 } 5486 5487 /** 5488 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields 5489 * @sk: socket to use for headers 5490 * 5491 * This function will extract the necessary field from the socket and use 5492 * them to generate a hash based on the LAYER34 xmit_policy. 5493 * Assumes that sk is a TCP or UDP socket. 5494 */ 5495 static u32 bond_sk_hash_l34(struct sock *sk) 5496 { 5497 struct flow_keys flow; 5498 u32 hash; 5499 5500 bond_sk_to_flow(sk, &flow); 5501 5502 /* L4 */ 5503 memcpy(&hash, &flow.ports.ports, sizeof(hash)); 5504 /* L3 */ 5505 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34); 5506 } 5507 5508 static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond, 5509 struct sock *sk) 5510 { 5511 struct bond_up_slave *slaves; 5512 struct slave *slave; 5513 unsigned int count; 5514 u32 hash; 5515 5516 slaves = rcu_dereference(bond->usable_slaves); 5517 count = slaves ? READ_ONCE(slaves->count) : 0; 5518 if (unlikely(!count)) 5519 return NULL; 5520 5521 hash = bond_sk_hash_l34(sk); 5522 slave = slaves->arr[hash % count]; 5523 5524 return slave->dev; 5525 } 5526 5527 static struct net_device *bond_sk_get_lower_dev(struct net_device *dev, 5528 struct sock *sk) 5529 { 5530 struct bonding *bond = netdev_priv(dev); 5531 struct net_device *lower = NULL; 5532 5533 rcu_read_lock(); 5534 if (bond_sk_check(bond)) 5535 lower = __bond_sk_get_lower_dev(bond, sk); 5536 rcu_read_unlock(); 5537 5538 return lower; 5539 } 5540 5541 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5542 static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb, 5543 struct net_device *dev) 5544 { 5545 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev); 5546 5547 /* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded 5548 * was true, if tls_device_down is running in parallel, but it's OK, 5549 * because bond_get_slave_by_dev has a NULL check. 5550 */ 5551 if (likely(bond_get_slave_by_dev(bond, tls_netdev))) 5552 return bond_dev_queue_xmit(bond, skb, tls_netdev); 5553 return bond_tx_drop(dev, skb); 5554 } 5555 #endif 5556 5557 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5558 { 5559 struct bonding *bond = netdev_priv(dev); 5560 5561 if (bond_should_override_tx_queue(bond) && 5562 !bond_slave_override(bond, skb)) 5563 return NETDEV_TX_OK; 5564 5565 #if IS_ENABLED(CONFIG_TLS_DEVICE) 5566 if (tls_is_skb_tx_device_offloaded(skb)) 5567 return bond_tls_device_xmit(bond, skb, dev); 5568 #endif 5569 5570 switch (BOND_MODE(bond)) { 5571 case BOND_MODE_ROUNDROBIN: 5572 return bond_xmit_roundrobin(skb, dev); 5573 case BOND_MODE_ACTIVEBACKUP: 5574 return bond_xmit_activebackup(skb, dev); 5575 case BOND_MODE_8023AD: 5576 case BOND_MODE_XOR: 5577 return bond_3ad_xor_xmit(skb, dev); 5578 case BOND_MODE_BROADCAST: 5579 return bond_xmit_broadcast(skb, dev); 5580 case BOND_MODE_ALB: 5581 return bond_alb_xmit(skb, dev); 5582 case BOND_MODE_TLB: 5583 return bond_tlb_xmit(skb, dev); 5584 default: 5585 /* Should never happen, mode already checked */ 5586 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond)); 5587 WARN_ON_ONCE(1); 5588 return bond_tx_drop(dev, skb); 5589 } 5590 } 5591 5592 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev) 5593 { 5594 struct bonding *bond = netdev_priv(dev); 5595 netdev_tx_t ret = NETDEV_TX_OK; 5596 5597 /* If we risk deadlock from transmitting this in the 5598 * netpoll path, tell netpoll to queue the frame for later tx 5599 */ 5600 if (unlikely(is_netpoll_tx_blocked(dev))) 5601 return NETDEV_TX_BUSY; 5602 5603 rcu_read_lock(); 5604 if (bond_has_slaves(bond)) 5605 ret = __bond_start_xmit(skb, dev); 5606 else 5607 ret = bond_tx_drop(dev, skb); 5608 rcu_read_unlock(); 5609 5610 return ret; 5611 } 5612 5613 static struct net_device * 5614 bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) 5615 { 5616 struct bonding *bond = netdev_priv(bond_dev); 5617 struct slave *slave; 5618 5619 /* Caller needs to hold rcu_read_lock() */ 5620 5621 switch (BOND_MODE(bond)) { 5622 case BOND_MODE_ROUNDROBIN: 5623 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp); 5624 break; 5625 5626 case BOND_MODE_ACTIVEBACKUP: 5627 slave = bond_xmit_activebackup_slave_get(bond); 5628 break; 5629 5630 case BOND_MODE_8023AD: 5631 case BOND_MODE_XOR: 5632 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp); 5633 break; 5634 5635 default: 5636 if (net_ratelimit()) 5637 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", 5638 BOND_MODE(bond)); 5639 return NULL; 5640 } 5641 5642 if (slave) 5643 return slave->dev; 5644 5645 return NULL; 5646 } 5647 5648 static int bond_xdp_xmit(struct net_device *bond_dev, 5649 int n, struct xdp_frame **frames, u32 flags) 5650 { 5651 int nxmit, err = -ENXIO; 5652 5653 rcu_read_lock(); 5654 5655 for (nxmit = 0; nxmit < n; nxmit++) { 5656 struct xdp_frame *frame = frames[nxmit]; 5657 struct xdp_frame *frames1[] = {frame}; 5658 struct net_device *slave_dev; 5659 struct xdp_buff xdp; 5660 5661 xdp_convert_frame_to_buff(frame, &xdp); 5662 5663 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp); 5664 if (!slave_dev) { 5665 err = -ENXIO; 5666 break; 5667 } 5668 5669 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags); 5670 if (err < 1) 5671 break; 5672 } 5673 5674 rcu_read_unlock(); 5675 5676 /* If error happened on the first frame then we can pass the error up, otherwise 5677 * report the number of frames that were xmitted. 5678 */ 5679 if (err < 0) 5680 return (nxmit == 0 ? err : nxmit); 5681 5682 return nxmit; 5683 } 5684 5685 static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog, 5686 struct netlink_ext_ack *extack) 5687 { 5688 struct bonding *bond = netdev_priv(dev); 5689 struct list_head *iter; 5690 struct slave *slave, *rollback_slave; 5691 struct bpf_prog *old_prog; 5692 struct netdev_bpf xdp = { 5693 .command = XDP_SETUP_PROG, 5694 .flags = 0, 5695 .prog = prog, 5696 .extack = extack, 5697 }; 5698 int err; 5699 5700 ASSERT_RTNL(); 5701 5702 if (!bond_xdp_check(bond)) { 5703 BOND_NL_ERR(dev, extack, 5704 "No native XDP support for the current bonding mode"); 5705 return -EOPNOTSUPP; 5706 } 5707 5708 old_prog = bond->xdp_prog; 5709 bond->xdp_prog = prog; 5710 5711 bond_for_each_slave(bond, slave, iter) { 5712 struct net_device *slave_dev = slave->dev; 5713 5714 if (!slave_dev->netdev_ops->ndo_bpf || 5715 !slave_dev->netdev_ops->ndo_xdp_xmit) { 5716 SLAVE_NL_ERR(dev, slave_dev, extack, 5717 "Slave device does not support XDP"); 5718 err = -EOPNOTSUPP; 5719 goto err; 5720 } 5721 5722 if (dev_xdp_prog_count(slave_dev) > 0) { 5723 SLAVE_NL_ERR(dev, slave_dev, extack, 5724 "Slave has XDP program loaded, please unload before enslaving"); 5725 err = -EOPNOTSUPP; 5726 goto err; 5727 } 5728 5729 err = dev_xdp_propagate(slave_dev, &xdp); 5730 if (err < 0) { 5731 /* ndo_bpf() sets extack error message */ 5732 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err); 5733 goto err; 5734 } 5735 if (prog) 5736 bpf_prog_inc(prog); 5737 } 5738 5739 if (prog) { 5740 static_branch_inc(&bpf_master_redirect_enabled_key); 5741 } else if (old_prog) { 5742 bpf_prog_put(old_prog); 5743 static_branch_dec(&bpf_master_redirect_enabled_key); 5744 } 5745 5746 return 0; 5747 5748 err: 5749 /* unwind the program changes */ 5750 bond->xdp_prog = old_prog; 5751 xdp.prog = old_prog; 5752 xdp.extack = NULL; /* do not overwrite original error */ 5753 5754 bond_for_each_slave(bond, rollback_slave, iter) { 5755 struct net_device *slave_dev = rollback_slave->dev; 5756 int err_unwind; 5757 5758 if (slave == rollback_slave) 5759 break; 5760 5761 err_unwind = dev_xdp_propagate(slave_dev, &xdp); 5762 if (err_unwind < 0) 5763 slave_err(dev, slave_dev, 5764 "Error %d when unwinding XDP program change\n", err_unwind); 5765 else if (xdp.prog) 5766 bpf_prog_inc(xdp.prog); 5767 } 5768 return err; 5769 } 5770 5771 static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp) 5772 { 5773 switch (xdp->command) { 5774 case XDP_SETUP_PROG: 5775 return bond_xdp_set(dev, xdp->prog, xdp->extack); 5776 default: 5777 return -EINVAL; 5778 } 5779 } 5780 5781 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed) 5782 { 5783 if (speed == 0 || speed == SPEED_UNKNOWN) 5784 speed = slave->speed; 5785 else 5786 speed = min(speed, slave->speed); 5787 5788 return speed; 5789 } 5790 5791 /* Set the BOND_PHC_INDEX flag to notify user space */ 5792 static int bond_set_phc_index_flag(struct kernel_hwtstamp_config *kernel_cfg) 5793 { 5794 struct ifreq *ifr = kernel_cfg->ifr; 5795 struct hwtstamp_config cfg; 5796 5797 if (kernel_cfg->copied_to_user) { 5798 /* Lower device has a legacy implementation */ 5799 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg))) 5800 return -EFAULT; 5801 5802 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 5803 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg))) 5804 return -EFAULT; 5805 } else { 5806 kernel_cfg->flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX; 5807 } 5808 5809 return 0; 5810 } 5811 5812 static int bond_hwtstamp_get(struct net_device *dev, 5813 struct kernel_hwtstamp_config *cfg) 5814 { 5815 struct bonding *bond = netdev_priv(dev); 5816 struct net_device *real_dev; 5817 int err; 5818 5819 real_dev = bond_option_active_slave_get_rcu(bond); 5820 if (!real_dev) 5821 return -EOPNOTSUPP; 5822 5823 err = generic_hwtstamp_get_lower(real_dev, cfg); 5824 if (err) 5825 return err; 5826 5827 return bond_set_phc_index_flag(cfg); 5828 } 5829 5830 static int bond_hwtstamp_set(struct net_device *dev, 5831 struct kernel_hwtstamp_config *cfg, 5832 struct netlink_ext_ack *extack) 5833 { 5834 struct bonding *bond = netdev_priv(dev); 5835 struct net_device *real_dev; 5836 int err; 5837 5838 if (!(cfg->flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX)) 5839 return -EOPNOTSUPP; 5840 5841 real_dev = bond_option_active_slave_get_rcu(bond); 5842 if (!real_dev) 5843 return -EOPNOTSUPP; 5844 5845 err = generic_hwtstamp_set_lower(real_dev, cfg, extack); 5846 if (err) 5847 return err; 5848 5849 return bond_set_phc_index_flag(cfg); 5850 } 5851 5852 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev, 5853 struct ethtool_link_ksettings *cmd) 5854 { 5855 struct bonding *bond = netdev_priv(bond_dev); 5856 struct list_head *iter; 5857 struct slave *slave; 5858 u32 speed = 0; 5859 5860 cmd->base.duplex = DUPLEX_UNKNOWN; 5861 cmd->base.port = PORT_OTHER; 5862 5863 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we 5864 * do not need to check mode. Though link speed might not represent 5865 * the true receive or transmit bandwidth (not all modes are symmetric) 5866 * this is an accurate maximum. 5867 */ 5868 bond_for_each_slave(bond, slave, iter) { 5869 if (bond_slave_can_tx(slave)) { 5870 bond_update_speed_duplex(slave); 5871 if (slave->speed != SPEED_UNKNOWN) { 5872 if (BOND_MODE(bond) == BOND_MODE_BROADCAST) 5873 speed = bond_mode_bcast_speed(slave, 5874 speed); 5875 else 5876 speed += slave->speed; 5877 } 5878 if (cmd->base.duplex == DUPLEX_UNKNOWN && 5879 slave->duplex != DUPLEX_UNKNOWN) 5880 cmd->base.duplex = slave->duplex; 5881 } 5882 } 5883 cmd->base.speed = speed ? : SPEED_UNKNOWN; 5884 5885 return 0; 5886 } 5887 5888 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev, 5889 struct ethtool_drvinfo *drvinfo) 5890 { 5891 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver)); 5892 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d", 5893 BOND_ABI_VERSION); 5894 } 5895 5896 static int bond_ethtool_get_ts_info(struct net_device *bond_dev, 5897 struct kernel_ethtool_ts_info *info) 5898 { 5899 struct bonding *bond = netdev_priv(bond_dev); 5900 struct kernel_ethtool_ts_info ts_info; 5901 struct net_device *real_dev; 5902 bool sw_tx_support = false; 5903 struct list_head *iter; 5904 struct slave *slave; 5905 int ret = 0; 5906 5907 rcu_read_lock(); 5908 real_dev = bond_option_active_slave_get_rcu(bond); 5909 dev_hold(real_dev); 5910 rcu_read_unlock(); 5911 5912 if (real_dev) { 5913 ret = ethtool_get_ts_info_by_layer(real_dev, info); 5914 } else { 5915 /* Check if all slaves support software tx timestamping */ 5916 rcu_read_lock(); 5917 bond_for_each_slave_rcu(bond, slave, iter) { 5918 ret = ethtool_get_ts_info_by_layer(slave->dev, &ts_info); 5919 if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) { 5920 sw_tx_support = true; 5921 continue; 5922 } 5923 5924 sw_tx_support = false; 5925 break; 5926 } 5927 rcu_read_unlock(); 5928 } 5929 5930 if (sw_tx_support) 5931 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE; 5932 5933 dev_put(real_dev); 5934 return ret; 5935 } 5936 5937 static const struct ethtool_ops bond_ethtool_ops = { 5938 .get_drvinfo = bond_ethtool_get_drvinfo, 5939 .get_link = ethtool_op_get_link, 5940 .get_link_ksettings = bond_ethtool_get_link_ksettings, 5941 .get_ts_info = bond_ethtool_get_ts_info, 5942 }; 5943 5944 static const struct net_device_ops bond_netdev_ops = { 5945 .ndo_init = bond_init, 5946 .ndo_uninit = bond_uninit, 5947 .ndo_open = bond_open, 5948 .ndo_stop = bond_close, 5949 .ndo_start_xmit = bond_start_xmit, 5950 .ndo_select_queue = bond_select_queue, 5951 .ndo_get_stats64 = bond_get_stats, 5952 .ndo_eth_ioctl = bond_eth_ioctl, 5953 .ndo_siocbond = bond_do_ioctl, 5954 .ndo_siocdevprivate = bond_siocdevprivate, 5955 .ndo_change_rx_flags = bond_change_rx_flags, 5956 .ndo_set_rx_mode = bond_set_rx_mode, 5957 .ndo_change_mtu = bond_change_mtu, 5958 .ndo_set_mac_address = bond_set_mac_address, 5959 .ndo_neigh_setup = bond_neigh_setup, 5960 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid, 5961 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid, 5962 #ifdef CONFIG_NET_POLL_CONTROLLER 5963 .ndo_netpoll_setup = bond_netpoll_setup, 5964 .ndo_netpoll_cleanup = bond_netpoll_cleanup, 5965 .ndo_poll_controller = bond_poll_controller, 5966 #endif 5967 .ndo_add_slave = bond_enslave, 5968 .ndo_del_slave = bond_release, 5969 .ndo_fix_features = bond_fix_features, 5970 .ndo_features_check = passthru_features_check, 5971 .ndo_get_xmit_slave = bond_xmit_get_slave, 5972 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev, 5973 .ndo_bpf = bond_xdp, 5974 .ndo_xdp_xmit = bond_xdp_xmit, 5975 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave, 5976 .ndo_hwtstamp_get = bond_hwtstamp_get, 5977 .ndo_hwtstamp_set = bond_hwtstamp_set, 5978 }; 5979 5980 static const struct device_type bond_type = { 5981 .name = "bond", 5982 }; 5983 5984 static void bond_destructor(struct net_device *bond_dev) 5985 { 5986 struct bonding *bond = netdev_priv(bond_dev); 5987 5988 if (bond->wq) 5989 destroy_workqueue(bond->wq); 5990 5991 free_percpu(bond->rr_tx_counter); 5992 } 5993 5994 void bond_setup(struct net_device *bond_dev) 5995 { 5996 struct bonding *bond = netdev_priv(bond_dev); 5997 5998 spin_lock_init(&bond->mode_lock); 5999 bond->params = bonding_defaults; 6000 6001 /* Initialize pointers */ 6002 bond->dev = bond_dev; 6003 6004 /* Initialize the device entry points */ 6005 ether_setup(bond_dev); 6006 bond_dev->max_mtu = ETH_MAX_MTU; 6007 bond_dev->netdev_ops = &bond_netdev_ops; 6008 bond_dev->ethtool_ops = &bond_ethtool_ops; 6009 6010 bond_dev->needs_free_netdev = true; 6011 bond_dev->priv_destructor = bond_destructor; 6012 6013 SET_NETDEV_DEVTYPE(bond_dev, &bond_type); 6014 6015 /* Initialize the device options */ 6016 bond_dev->flags |= IFF_MASTER; 6017 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE; 6018 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); 6019 6020 #ifdef CONFIG_XFRM_OFFLOAD 6021 /* set up xfrm device ops (only supported in active-backup right now) */ 6022 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops; 6023 INIT_LIST_HEAD(&bond->ipsec_list); 6024 mutex_init(&bond->ipsec_lock); 6025 #endif /* CONFIG_XFRM_OFFLOAD */ 6026 6027 /* don't acquire bond device's netif_tx_lock when transmitting */ 6028 bond_dev->lltx = true; 6029 6030 /* Don't allow bond devices to change network namespaces. */ 6031 bond_dev->netns_local = true; 6032 6033 /* By default, we declare the bond to be fully 6034 * VLAN hardware accelerated capable. Special 6035 * care is taken in the various xmit functions 6036 * when there are slaves that are not hw accel 6037 * capable 6038 */ 6039 6040 bond_dev->hw_features = BOND_VLAN_FEATURES | 6041 NETIF_F_HW_VLAN_CTAG_RX | 6042 NETIF_F_HW_VLAN_CTAG_FILTER | 6043 NETIF_F_HW_VLAN_STAG_RX | 6044 NETIF_F_HW_VLAN_STAG_FILTER; 6045 6046 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL; 6047 bond_dev->features |= bond_dev->hw_features; 6048 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX; 6049 #ifdef CONFIG_XFRM_OFFLOAD 6050 bond_dev->hw_features |= BOND_XFRM_FEATURES; 6051 /* Only enable XFRM features if this is an active-backup config */ 6052 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) 6053 bond_dev->features |= BOND_XFRM_FEATURES; 6054 #endif /* CONFIG_XFRM_OFFLOAD */ 6055 } 6056 6057 /* Destroy a bonding device. 6058 * Must be under rtnl_lock when this function is called. 6059 */ 6060 static void bond_uninit(struct net_device *bond_dev) 6061 { 6062 struct bonding *bond = netdev_priv(bond_dev); 6063 struct list_head *iter; 6064 struct slave *slave; 6065 6066 bond_netpoll_cleanup(bond_dev); 6067 6068 /* Release the bonded slaves */ 6069 bond_for_each_slave(bond, slave, iter) 6070 __bond_release_one(bond_dev, slave->dev, true, true); 6071 netdev_info(bond_dev, "Released all slaves\n"); 6072 6073 #ifdef CONFIG_XFRM_OFFLOAD 6074 mutex_destroy(&bond->ipsec_lock); 6075 #endif /* CONFIG_XFRM_OFFLOAD */ 6076 6077 bond_set_slave_arr(bond, NULL, NULL); 6078 6079 list_del_rcu(&bond->bond_list); 6080 6081 bond_debug_unregister(bond); 6082 } 6083 6084 /*------------------------- Module initialization ---------------------------*/ 6085 6086 static int __init bond_check_params(struct bond_params *params) 6087 { 6088 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i; 6089 struct bond_opt_value newval; 6090 const struct bond_opt_value *valptr; 6091 int arp_all_targets_value = 0; 6092 u16 ad_actor_sys_prio = 0; 6093 u16 ad_user_port_key = 0; 6094 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 }; 6095 int arp_ip_count; 6096 int bond_mode = BOND_MODE_ROUNDROBIN; 6097 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2; 6098 int lacp_fast = 0; 6099 int tlb_dynamic_lb; 6100 6101 /* Convert string parameters. */ 6102 if (mode) { 6103 bond_opt_initstr(&newval, mode); 6104 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval); 6105 if (!valptr) { 6106 pr_err("Error: Invalid bonding mode \"%s\"\n", mode); 6107 return -EINVAL; 6108 } 6109 bond_mode = valptr->value; 6110 } 6111 6112 if (xmit_hash_policy) { 6113 if (bond_mode == BOND_MODE_ROUNDROBIN || 6114 bond_mode == BOND_MODE_ACTIVEBACKUP || 6115 bond_mode == BOND_MODE_BROADCAST) { 6116 pr_info("xmit_hash_policy param is irrelevant in mode %s\n", 6117 bond_mode_name(bond_mode)); 6118 } else { 6119 bond_opt_initstr(&newval, xmit_hash_policy); 6120 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH), 6121 &newval); 6122 if (!valptr) { 6123 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n", 6124 xmit_hash_policy); 6125 return -EINVAL; 6126 } 6127 xmit_hashtype = valptr->value; 6128 } 6129 } 6130 6131 if (lacp_rate) { 6132 if (bond_mode != BOND_MODE_8023AD) { 6133 pr_info("lacp_rate param is irrelevant in mode %s\n", 6134 bond_mode_name(bond_mode)); 6135 } else { 6136 bond_opt_initstr(&newval, lacp_rate); 6137 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE), 6138 &newval); 6139 if (!valptr) { 6140 pr_err("Error: Invalid lacp rate \"%s\"\n", 6141 lacp_rate); 6142 return -EINVAL; 6143 } 6144 lacp_fast = valptr->value; 6145 } 6146 } 6147 6148 if (ad_select) { 6149 bond_opt_initstr(&newval, ad_select); 6150 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT), 6151 &newval); 6152 if (!valptr) { 6153 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select); 6154 return -EINVAL; 6155 } 6156 params->ad_select = valptr->value; 6157 if (bond_mode != BOND_MODE_8023AD) 6158 pr_warn("ad_select param only affects 802.3ad mode\n"); 6159 } else { 6160 params->ad_select = BOND_AD_STABLE; 6161 } 6162 6163 if (max_bonds < 0) { 6164 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", 6165 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); 6166 max_bonds = BOND_DEFAULT_MAX_BONDS; 6167 } 6168 6169 if (miimon < 0) { 6170 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6171 miimon, INT_MAX); 6172 miimon = 0; 6173 } 6174 6175 if (updelay < 0) { 6176 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6177 updelay, INT_MAX); 6178 updelay = 0; 6179 } 6180 6181 if (downdelay < 0) { 6182 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6183 downdelay, INT_MAX); 6184 downdelay = 0; 6185 } 6186 6187 if ((use_carrier != 0) && (use_carrier != 1)) { 6188 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n", 6189 use_carrier); 6190 use_carrier = 1; 6191 } 6192 6193 if (num_peer_notif < 0 || num_peer_notif > 255) { 6194 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n", 6195 num_peer_notif); 6196 num_peer_notif = 1; 6197 } 6198 6199 /* reset values for 802.3ad/TLB/ALB */ 6200 if (!bond_mode_uses_arp(bond_mode)) { 6201 if (!miimon) { 6202 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"); 6203 pr_warn("Forcing miimon to 100msec\n"); 6204 miimon = BOND_DEFAULT_MIIMON; 6205 } 6206 } 6207 6208 if (tx_queues < 1 || tx_queues > 255) { 6209 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n", 6210 tx_queues, BOND_DEFAULT_TX_QUEUES); 6211 tx_queues = BOND_DEFAULT_TX_QUEUES; 6212 } 6213 6214 if ((all_slaves_active != 0) && (all_slaves_active != 1)) { 6215 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n", 6216 all_slaves_active); 6217 all_slaves_active = 0; 6218 } 6219 6220 if (resend_igmp < 0 || resend_igmp > 255) { 6221 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n", 6222 resend_igmp, BOND_DEFAULT_RESEND_IGMP); 6223 resend_igmp = BOND_DEFAULT_RESEND_IGMP; 6224 } 6225 6226 bond_opt_initval(&newval, packets_per_slave); 6227 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) { 6228 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n", 6229 packets_per_slave, USHRT_MAX); 6230 packets_per_slave = 1; 6231 } 6232 6233 if (bond_mode == BOND_MODE_ALB) { 6234 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", 6235 updelay); 6236 } 6237 6238 if (!miimon) { 6239 if (updelay || downdelay) { 6240 /* just warn the user the up/down delay will have 6241 * no effect since miimon is zero... 6242 */ 6243 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", 6244 updelay, downdelay); 6245 } 6246 } else { 6247 /* don't allow arp monitoring */ 6248 if (arp_interval) { 6249 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n", 6250 miimon, arp_interval); 6251 arp_interval = 0; 6252 } 6253 6254 if ((updelay % miimon) != 0) { 6255 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n", 6256 updelay, miimon, (updelay / miimon) * miimon); 6257 } 6258 6259 updelay /= miimon; 6260 6261 if ((downdelay % miimon) != 0) { 6262 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n", 6263 downdelay, miimon, 6264 (downdelay / miimon) * miimon); 6265 } 6266 6267 downdelay /= miimon; 6268 } 6269 6270 if (arp_interval < 0) { 6271 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n", 6272 arp_interval, INT_MAX); 6273 arp_interval = 0; 6274 } 6275 6276 for (arp_ip_count = 0, i = 0; 6277 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) { 6278 __be32 ip; 6279 6280 /* not a complete check, but good enough to catch mistakes */ 6281 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) || 6282 !bond_is_ip_target_ok(ip)) { 6283 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n", 6284 arp_ip_target[i]); 6285 arp_interval = 0; 6286 } else { 6287 if (bond_get_targets_ip(arp_target, ip) == -1) 6288 arp_target[arp_ip_count++] = ip; 6289 else 6290 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n", 6291 &ip); 6292 } 6293 } 6294 6295 if (arp_interval && !arp_ip_count) { 6296 /* don't allow arping if no arp_ip_target given... */ 6297 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n", 6298 arp_interval); 6299 arp_interval = 0; 6300 } 6301 6302 if (arp_validate) { 6303 if (!arp_interval) { 6304 pr_err("arp_validate requires arp_interval\n"); 6305 return -EINVAL; 6306 } 6307 6308 bond_opt_initstr(&newval, arp_validate); 6309 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE), 6310 &newval); 6311 if (!valptr) { 6312 pr_err("Error: invalid arp_validate \"%s\"\n", 6313 arp_validate); 6314 return -EINVAL; 6315 } 6316 arp_validate_value = valptr->value; 6317 } else { 6318 arp_validate_value = 0; 6319 } 6320 6321 if (arp_all_targets) { 6322 bond_opt_initstr(&newval, arp_all_targets); 6323 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS), 6324 &newval); 6325 if (!valptr) { 6326 pr_err("Error: invalid arp_all_targets_value \"%s\"\n", 6327 arp_all_targets); 6328 arp_all_targets_value = 0; 6329 } else { 6330 arp_all_targets_value = valptr->value; 6331 } 6332 } 6333 6334 if (miimon) { 6335 pr_info("MII link monitoring set to %d ms\n", miimon); 6336 } else if (arp_interval) { 6337 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE, 6338 arp_validate_value); 6339 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):", 6340 arp_interval, valptr->string, arp_ip_count); 6341 6342 for (i = 0; i < arp_ip_count; i++) 6343 pr_cont(" %s", arp_ip_target[i]); 6344 6345 pr_cont("\n"); 6346 6347 } else if (max_bonds) { 6348 /* miimon and arp_interval not set, we need one so things 6349 * work as expected, see bonding.txt for details 6350 */ 6351 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"); 6352 } 6353 6354 if (primary && !bond_mode_uses_primary(bond_mode)) { 6355 /* currently, using a primary only makes sense 6356 * in active backup, TLB or ALB modes 6357 */ 6358 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n", 6359 primary, bond_mode_name(bond_mode)); 6360 primary = NULL; 6361 } 6362 6363 if (primary && primary_reselect) { 6364 bond_opt_initstr(&newval, primary_reselect); 6365 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT), 6366 &newval); 6367 if (!valptr) { 6368 pr_err("Error: Invalid primary_reselect \"%s\"\n", 6369 primary_reselect); 6370 return -EINVAL; 6371 } 6372 primary_reselect_value = valptr->value; 6373 } else { 6374 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS; 6375 } 6376 6377 if (fail_over_mac) { 6378 bond_opt_initstr(&newval, fail_over_mac); 6379 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC), 6380 &newval); 6381 if (!valptr) { 6382 pr_err("Error: invalid fail_over_mac \"%s\"\n", 6383 fail_over_mac); 6384 return -EINVAL; 6385 } 6386 fail_over_mac_value = valptr->value; 6387 if (bond_mode != BOND_MODE_ACTIVEBACKUP) 6388 pr_warn("Warning: fail_over_mac only affects active-backup mode\n"); 6389 } else { 6390 fail_over_mac_value = BOND_FOM_NONE; 6391 } 6392 6393 bond_opt_initstr(&newval, "default"); 6394 valptr = bond_opt_parse( 6395 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO), 6396 &newval); 6397 if (!valptr) { 6398 pr_err("Error: No ad_actor_sys_prio default value"); 6399 return -EINVAL; 6400 } 6401 ad_actor_sys_prio = valptr->value; 6402 6403 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY), 6404 &newval); 6405 if (!valptr) { 6406 pr_err("Error: No ad_user_port_key default value"); 6407 return -EINVAL; 6408 } 6409 ad_user_port_key = valptr->value; 6410 6411 bond_opt_initstr(&newval, "default"); 6412 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval); 6413 if (!valptr) { 6414 pr_err("Error: No tlb_dynamic_lb default value"); 6415 return -EINVAL; 6416 } 6417 tlb_dynamic_lb = valptr->value; 6418 6419 if (lp_interval == 0) { 6420 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n", 6421 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL); 6422 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL; 6423 } 6424 6425 /* fill params struct with the proper values */ 6426 params->mode = bond_mode; 6427 params->xmit_policy = xmit_hashtype; 6428 params->miimon = miimon; 6429 params->num_peer_notif = num_peer_notif; 6430 params->arp_interval = arp_interval; 6431 params->arp_validate = arp_validate_value; 6432 params->arp_all_targets = arp_all_targets_value; 6433 params->missed_max = 2; 6434 params->updelay = updelay; 6435 params->downdelay = downdelay; 6436 params->peer_notif_delay = 0; 6437 params->use_carrier = use_carrier; 6438 params->lacp_active = 1; 6439 params->lacp_fast = lacp_fast; 6440 params->primary[0] = 0; 6441 params->primary_reselect = primary_reselect_value; 6442 params->fail_over_mac = fail_over_mac_value; 6443 params->tx_queues = tx_queues; 6444 params->all_slaves_active = all_slaves_active; 6445 params->resend_igmp = resend_igmp; 6446 params->min_links = min_links; 6447 params->lp_interval = lp_interval; 6448 params->packets_per_slave = packets_per_slave; 6449 params->tlb_dynamic_lb = tlb_dynamic_lb; 6450 params->ad_actor_sys_prio = ad_actor_sys_prio; 6451 eth_zero_addr(params->ad_actor_system); 6452 params->ad_user_port_key = ad_user_port_key; 6453 params->coupled_control = 1; 6454 if (packets_per_slave > 0) { 6455 params->reciprocal_packets_per_slave = 6456 reciprocal_value(packets_per_slave); 6457 } else { 6458 /* reciprocal_packets_per_slave is unused if 6459 * packets_per_slave is 0 or 1, just initialize it 6460 */ 6461 params->reciprocal_packets_per_slave = 6462 (struct reciprocal_value) { 0 }; 6463 } 6464 6465 if (primary) 6466 strscpy_pad(params->primary, primary, sizeof(params->primary)); 6467 6468 memcpy(params->arp_targets, arp_target, sizeof(arp_target)); 6469 #if IS_ENABLED(CONFIG_IPV6) 6470 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS); 6471 #endif 6472 6473 return 0; 6474 } 6475 6476 /* Called from registration process */ 6477 static int bond_init(struct net_device *bond_dev) 6478 { 6479 struct bonding *bond = netdev_priv(bond_dev); 6480 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id); 6481 6482 netdev_dbg(bond_dev, "Begin bond_init\n"); 6483 6484 bond->wq = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, 6485 bond_dev->name); 6486 if (!bond->wq) 6487 return -ENOMEM; 6488 6489 bond->notifier_ctx = false; 6490 6491 spin_lock_init(&bond->stats_lock); 6492 netdev_lockdep_set_classes(bond_dev); 6493 6494 list_add_tail_rcu(&bond->bond_list, &bn->dev_list); 6495 6496 bond_prepare_sysfs_group(bond); 6497 6498 bond_debug_register(bond); 6499 6500 /* Ensure valid dev_addr */ 6501 if (is_zero_ether_addr(bond_dev->dev_addr) && 6502 bond_dev->addr_assign_type == NET_ADDR_PERM) 6503 eth_hw_addr_random(bond_dev); 6504 6505 return 0; 6506 } 6507 6508 unsigned int bond_get_num_tx_queues(void) 6509 { 6510 return tx_queues; 6511 } 6512 6513 /* Create a new bond based on the specified name and bonding parameters. 6514 * If name is NULL, obtain a suitable "bond%d" name for us. 6515 * Caller must NOT hold rtnl_lock; we need to release it here before we 6516 * set up our sysfs entries. 6517 */ 6518 int bond_create(struct net *net, const char *name) 6519 { 6520 struct net_device *bond_dev; 6521 struct bonding *bond; 6522 int res = -ENOMEM; 6523 6524 rtnl_lock(); 6525 6526 bond_dev = alloc_netdev_mq(sizeof(struct bonding), 6527 name ? name : "bond%d", NET_NAME_UNKNOWN, 6528 bond_setup, tx_queues); 6529 if (!bond_dev) 6530 goto out; 6531 6532 bond = netdev_priv(bond_dev); 6533 dev_net_set(bond_dev, net); 6534 bond_dev->rtnl_link_ops = &bond_link_ops; 6535 6536 res = register_netdevice(bond_dev); 6537 if (res < 0) { 6538 free_netdev(bond_dev); 6539 goto out; 6540 } 6541 6542 netif_carrier_off(bond_dev); 6543 6544 bond_work_init_all(bond); 6545 6546 out: 6547 rtnl_unlock(); 6548 return res; 6549 } 6550 6551 static int __net_init bond_net_init(struct net *net) 6552 { 6553 struct bond_net *bn = net_generic(net, bond_net_id); 6554 6555 bn->net = net; 6556 INIT_LIST_HEAD(&bn->dev_list); 6557 6558 bond_create_proc_dir(bn); 6559 bond_create_sysfs(bn); 6560 6561 return 0; 6562 } 6563 6564 /* According to commit 69b0216ac255 ("bonding: fix bonding_masters 6565 * race condition in bond unloading") we need to remove sysfs files 6566 * before we remove our devices (done later in bond_net_exit_batch_rtnl()) 6567 */ 6568 static void __net_exit bond_net_pre_exit(struct net *net) 6569 { 6570 struct bond_net *bn = net_generic(net, bond_net_id); 6571 6572 bond_destroy_sysfs(bn); 6573 } 6574 6575 static void __net_exit bond_net_exit_batch_rtnl(struct list_head *net_list, 6576 struct list_head *dev_kill_list) 6577 { 6578 struct bond_net *bn; 6579 struct net *net; 6580 6581 /* Kill off any bonds created after unregistering bond rtnl ops */ 6582 list_for_each_entry(net, net_list, exit_list) { 6583 struct bonding *bond, *tmp_bond; 6584 6585 bn = net_generic(net, bond_net_id); 6586 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list) 6587 unregister_netdevice_queue(bond->dev, dev_kill_list); 6588 } 6589 } 6590 6591 /* According to commit 23fa5c2caae0 ("bonding: destroy proc directory 6592 * only after all bonds are gone") bond_destroy_proc_dir() is called 6593 * after bond_net_exit_batch_rtnl() has completed. 6594 */ 6595 static void __net_exit bond_net_exit_batch(struct list_head *net_list) 6596 { 6597 struct bond_net *bn; 6598 struct net *net; 6599 6600 list_for_each_entry(net, net_list, exit_list) { 6601 bn = net_generic(net, bond_net_id); 6602 bond_destroy_proc_dir(bn); 6603 } 6604 } 6605 6606 static struct pernet_operations bond_net_ops = { 6607 .init = bond_net_init, 6608 .pre_exit = bond_net_pre_exit, 6609 .exit_batch_rtnl = bond_net_exit_batch_rtnl, 6610 .exit_batch = bond_net_exit_batch, 6611 .id = &bond_net_id, 6612 .size = sizeof(struct bond_net), 6613 }; 6614 6615 static int __init bonding_init(void) 6616 { 6617 int i; 6618 int res; 6619 6620 res = bond_check_params(&bonding_defaults); 6621 if (res) 6622 goto out; 6623 6624 bond_create_debugfs(); 6625 6626 res = register_pernet_subsys(&bond_net_ops); 6627 if (res) 6628 goto err_net_ops; 6629 6630 res = bond_netlink_init(); 6631 if (res) 6632 goto err_link; 6633 6634 for (i = 0; i < max_bonds; i++) { 6635 res = bond_create(&init_net, NULL); 6636 if (res) 6637 goto err; 6638 } 6639 6640 skb_flow_dissector_init(&flow_keys_bonding, 6641 flow_keys_bonding_keys, 6642 ARRAY_SIZE(flow_keys_bonding_keys)); 6643 6644 register_netdevice_notifier(&bond_netdev_notifier); 6645 out: 6646 return res; 6647 err: 6648 bond_netlink_fini(); 6649 err_link: 6650 unregister_pernet_subsys(&bond_net_ops); 6651 err_net_ops: 6652 bond_destroy_debugfs(); 6653 goto out; 6654 6655 } 6656 6657 static void __exit bonding_exit(void) 6658 { 6659 unregister_netdevice_notifier(&bond_netdev_notifier); 6660 6661 bond_netlink_fini(); 6662 unregister_pernet_subsys(&bond_net_ops); 6663 6664 bond_destroy_debugfs(); 6665 6666 #ifdef CONFIG_NET_POLL_CONTROLLER 6667 /* Make sure we don't have an imbalance on our netpoll blocking */ 6668 WARN_ON(atomic_read(&netpoll_block_tx)); 6669 #endif 6670 } 6671 6672 module_init(bonding_init); 6673 module_exit(bonding_exit); 6674 MODULE_LICENSE("GPL"); 6675 MODULE_DESCRIPTION(DRV_DESCRIPTION); 6676 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others"); 6677