6665 lines · c
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 driver9 *10 * This is useful to talk to a Cisco EtherChannel compatible equipment:11 * Cisco 550012 * Sun Trunking (Solaris)13 * Alteon AceDirector Trunks14 * Linux Bonding15 * and probably many L2 switches ...16 *17 * How it works:18 * ifconfig bond0 ipaddress netmask up19 * will setup a network device, with an ip address. No mac address20 * will be assigned at this time. The hw mac address will come from21 * the first slave bonded to the channel. All slaves will then use22 * this hw mac address.23 *24 * ifconfig bond0 down25 * will release all slaves, marking them as down.26 *27 * ifenslave bond0 eth028 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either29 * a: be used as initial mac address30 * b: if a hw mac address already is there, eth0's hw mac address31 * 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#endif92#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 101static int max_bonds = BOND_DEFAULT_MAX_BONDS;102static int tx_queues = BOND_DEFAULT_TX_QUEUES;103static int num_peer_notif = 1;104static int miimon;105static int updelay;106static int downdelay;107static int use_carrier = 1;108static char *mode;109static char *primary;110static char *primary_reselect;111static char *lacp_rate;112static int min_links;113static char *ad_select;114static char *xmit_hash_policy;115static int arp_interval;116static char *arp_ip_target[BOND_MAX_ARP_TARGETS];117static char *arp_validate;118static char *arp_all_targets;119static char *fail_over_mac;120static int all_slaves_active;121static struct bond_params bonding_defaults;122static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;123static int packets_per_slave = 1;124static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;125 126module_param(max_bonds, int, 0);127MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");128module_param(tx_queues, int, 0);129MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");130module_param_named(num_grat_arp, num_peer_notif, int, 0644);131MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "132 "failover event (alias of num_unsol_na)");133module_param_named(num_unsol_na, num_peer_notif, int, 0644);134MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "135 "failover event (alias of num_grat_arp)");136module_param(miimon, int, 0);137MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");138module_param(updelay, int, 0);139MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");140module_param(downdelay, int, 0);141MODULE_PARM_DESC(downdelay, "Delay before considering link down, "142 "in milliseconds");143module_param(use_carrier, int, 0);144MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "145 "0 for off, 1 for on (default)");146module_param(mode, charp, 0);147MODULE_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");151module_param(primary, charp, 0);152MODULE_PARM_DESC(primary, "Primary network device to use");153module_param(primary_reselect, charp, 0);154MODULE_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");161module_param(lacp_rate, charp, 0);162MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "163 "0 for slow, 1 for fast");164module_param(ad_select, charp, 0);165MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "166 "0 for stable (default), 1 for bandwidth, "167 "2 for count");168module_param(min_links, int, 0);169MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");170 171module_param(xmit_hash_policy, charp, 0);172MODULE_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");176module_param(arp_interval, int, 0);177MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");178module_param_array(arp_ip_target, charp, NULL, 0);179MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");180module_param(arp_validate, charp, 0);181MODULE_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");184module_param(arp_all_targets, charp, 0);185MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");186module_param(fail_over_mac, charp, 0);187MODULE_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");190module_param(all_slaves_active, int, 0);191MODULE_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.");194module_param(resend_igmp, int, 0);195MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "196 "link failure");197module_param(packets_per_slave, int, 0);198MODULE_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.");201module_param(lp_interval, uint, 0);202MODULE_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_CONTROLLER209atomic_t netpoll_block_tx = ATOMIC_INIT(0);210#endif211 212unsigned int bond_net_id __read_mostly;213 214static 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 257static struct flow_dissector flow_keys_bonding __read_mostly;258 259/*-------------------------- Forward declarations ---------------------------*/260 261static int bond_init(struct net_device *bond_dev);262static void bond_uninit(struct net_device *bond_dev);263static void bond_get_stats(struct net_device *bond_dev,264 struct rtnl_link_stats64 *stats);265static void bond_slave_arr_handler(struct work_struct *work);266static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,267 int mod);268static void bond_netdev_notify_work(struct work_struct *work);269 270/*---------------------------- General routines -----------------------------*/271 272const 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 transmit295 * @slave_dev: slave that is supposed to xmit this skbuff296 */297netdev_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 312static 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 325static 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 802.1q334 * 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 driver351 * entry point is generally a BAD idea.352 *353 * The design of synchronization/protection for this operation in the 8021q354 * module is good for one or more VLAN devices over a single physical device355 * and cannot be extended for a teaming solution like bonding, so there is a356 * potential race condition here where a net device from the vlan group might357 * be referenced (either by a base driver or the 8021q code) while it is being358 * removed from the system. However, it turns out we're not making matters359 * 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 slaves364 * @bond_dev: bonding net device that got called365 * @proto: network protocol ID366 * @vid: vlan id being added367 */368static 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 384unwind: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 slaves398 * @bond_dev: bonding net device that got called399 * @proto: network protocol ID400 * @vid: vlan id being removed401 */402static 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_OFFLOAD421/**422 * bond_ipsec_dev - Get active device for IPsec offload423 * @xs: pointer to transformer state struct424 *425 * Context: caller must hold rcu_read_lock.426 *427 * Return: the device for ipsec offload, or NULL if not exist.428 **/429static 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 association458 * @xs: pointer to transformer state struct459 * @extack: extack point to fill failure reason460 **/461static 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 }511out:512 netdev_put(real_dev, &tracker);513 return err;514}515 516static 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 }550out:551 mutex_unlock(&bond->ipsec_lock);552}553 554/**555 * bond_ipsec_del_sa - clear out this specific SA556 * @xs: pointer to transformer state struct557 **/558static 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);593out: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 606static 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 638static 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);667out:668 netdev_put(real_dev, &tracker);669}670 671/**672 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload673 * @skb: current data packet674 * @xs: pointer to transformer state struct675 **/676static 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);692out:693 rcu_read_unlock();694 return ok;695}696 697/**698 * bond_advance_esn_state - ESN support for IPSec HW offload699 * @xs: pointer to transformer state struct700 **/701static 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);717out:718 rcu_read_unlock();719}720 721/**722 * bond_xfrm_update_stats - Update xfrm state723 * @xs: pointer to transformer state struct724 **/725static 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);741out:742 rcu_read_unlock();743}744 745static 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 its758 * 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 */763int 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 784down: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 driver793 * using ethtool. If for some reason the call fails or the794 * values are invalid, set speed and duplex to -1,795 * and return. Return 1 if speed or duplex settings are796 * UNKNOWN; 0 otherwise.797 */798static 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 826const 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 we848 * can't tell and just pretend it is), or 0, meaning that the link is849 * down.850 *851 * If reporting is non-zero, instead of faking link up, return -1 if852 * both ETHTOOL and MII ioctls fail (meaning the device does not853 * 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 supports855 * netif_carrier, but there really isn't.856 */857static 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 member880 * bases to make this more efficient. that is, once881 * we determine the correct ioctl, we will always882 * call it and not the others for that team883 * member.884 */885 886 /* We cannot assume that SIOCGMIIPHY will also read a887 * 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 we903 * cannot report link status). If not reporting, pretend904 * 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 */912static 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 */935static 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 bonding958 * device and retransmit an IGMP JOIN request to the current active959 * slave.960 */961static 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 */980static 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 and995 * old active slaves (if any). Modes that are not using primary keep all996 * slaves up date at all times; only the modes that use primary need to call997 * this function to swap these settings during a failover.998 */999static 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 bond1036 * @bond_dev: bond net device1037 * @slave_dev: slave net device1038 *1039 * Should be called with RTNL held.1040 */1041static 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 1058static 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_mac1076 *1077 * Perform special MAC address swapping for fail_over_mac settings1078 *1079 * Called with RTNL1080 */1081static 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 them1100 * if just old_active, do nothing (going to no active slave)1101 * if just new_active, set new_active to bond's MAC1102 */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);1142out: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 slave1154 * @bond: our bonding struct1155 *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 primary1161 * link and do link reselection.1162 */1163static 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 1194link_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 one1219 * @bond: our bonding struct1220 */1221static 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 */1245static 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 one1264 * @bond: our bonding struct1265 * @new_active: the new slave to make the active one1266 *1267 * Set the new slave to the bond's settings and unset them on the old1268 * 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 its1273 * updelay hasn't timed out yet.1274 *1275 * Caller must hold RTNL.1276 */1277void 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_OFFLOAD1289 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_OFFLOAD1364 bond_ipsec_add_sa_all(bond);1365#endif /* CONFIG_XFRM_OFFLOAD */1366 1367 /* resend IGMP joins since active slave has changed or1368 * all were sent on curr_active_slave.1369 * resend only if bond is brought up with the affected1370 * bonding modes and the retransmission is enabled1371 */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 needed1382 * @bond: our bonding struct1383 *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 */1391void 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 else1408 netdev_info(bond->dev, "now running without any active interface!\n");1409 }1410}1411 1412#ifdef CONFIG_NET_POLL_CONTROLLER1413static 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;1429out:1430 return err;1431}1432static 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 1444static 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 1472static 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 1483static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)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#else1500static inline int slave_enable_netpoll(struct slave *slave)1501{1502 return 0;1503}1504static inline void slave_disable_netpoll(struct slave *slave)1505{1506}1507static void bond_netpoll_cleanup(struct net_device *bond_dev)1508{1509}1510#endif1511 1512/*---------------------------------- IOCTL ----------------------------------*/1513 1514static 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 1548static 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 vlan_features = BOND_VLAN_FEATURES;1553 netdev_features_t enc_features = BOND_ENC_FEATURES;1554#ifdef CONFIG_XFRM_OFFLOAD1555 netdev_features_t xfrm_features = BOND_XFRM_FEATURES;1556#endif /* CONFIG_XFRM_OFFLOAD */1557 netdev_features_t mpls_features = BOND_MPLS_FEATURES;1558 struct net_device *bond_dev = bond->dev;1559 struct list_head *iter;1560 struct slave *slave;1561 unsigned short max_hard_header_len = ETH_HLEN;1562 unsigned int tso_max_size = TSO_MAX_SIZE;1563 u16 tso_max_segs = TSO_MAX_SEGS;1564 1565 if (!bond_has_slaves(bond))1566 goto done;1567 vlan_features &= NETIF_F_ALL_FOR_ALL;1568 mpls_features &= NETIF_F_ALL_FOR_ALL;1569 1570 bond_for_each_slave(bond, slave, iter) {1571 vlan_features = netdev_increment_features(vlan_features,1572 slave->dev->vlan_features, BOND_VLAN_FEATURES);1573 1574 enc_features = netdev_increment_features(enc_features,1575 slave->dev->hw_enc_features,1576 BOND_ENC_FEATURES);1577 1578#ifdef CONFIG_XFRM_OFFLOAD1579 xfrm_features = netdev_increment_features(xfrm_features,1580 slave->dev->hw_enc_features,1581 BOND_XFRM_FEATURES);1582#endif /* CONFIG_XFRM_OFFLOAD */1583 1584 mpls_features = netdev_increment_features(mpls_features,1585 slave->dev->mpls_features,1586 BOND_MPLS_FEATURES);1587 1588 dst_release_flag &= slave->dev->priv_flags;1589 if (slave->dev->hard_header_len > max_hard_header_len)1590 max_hard_header_len = slave->dev->hard_header_len;1591 1592 tso_max_size = min(tso_max_size, slave->dev->tso_max_size);1593 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs);1594 }1595 bond_dev->hard_header_len = max_hard_header_len;1596 1597done:1598 bond_dev->vlan_features = vlan_features;1599 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |1600 NETIF_F_HW_VLAN_CTAG_TX |1601 NETIF_F_HW_VLAN_STAG_TX;1602#ifdef CONFIG_XFRM_OFFLOAD1603 bond_dev->hw_enc_features |= xfrm_features;1604#endif /* CONFIG_XFRM_OFFLOAD */1605 bond_dev->mpls_features = mpls_features;1606 netif_set_tso_max_segs(bond_dev, tso_max_segs);1607 netif_set_tso_max_size(bond_dev, tso_max_size);1608 1609 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;1610 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&1611 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))1612 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;1613 1614 netdev_change_features(bond_dev);1615}1616 1617static void bond_setup_by_slave(struct net_device *bond_dev,1618 struct net_device *slave_dev)1619{1620 bool was_up = !!(bond_dev->flags & IFF_UP);1621 1622 dev_close(bond_dev);1623 1624 bond_dev->header_ops = slave_dev->header_ops;1625 1626 bond_dev->type = slave_dev->type;1627 bond_dev->hard_header_len = slave_dev->hard_header_len;1628 bond_dev->needed_headroom = slave_dev->needed_headroom;1629 bond_dev->addr_len = slave_dev->addr_len;1630 1631 memcpy(bond_dev->broadcast, slave_dev->broadcast,1632 slave_dev->addr_len);1633 1634 if (slave_dev->flags & IFF_POINTOPOINT) {1635 bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);1636 bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP);1637 }1638 if (was_up)1639 dev_open(bond_dev, NULL);1640}1641 1642/* On bonding slaves other than the currently active slave, suppress1643 * duplicates except for alb non-mcast/bcast.1644 */1645static bool bond_should_deliver_exact_match(struct sk_buff *skb,1646 struct slave *slave,1647 struct bonding *bond)1648{1649 if (bond_is_slave_inactive(slave)) {1650 if (BOND_MODE(bond) == BOND_MODE_ALB &&1651 skb->pkt_type != PACKET_BROADCAST &&1652 skb->pkt_type != PACKET_MULTICAST)1653 return false;1654 return true;1655 }1656 return false;1657}1658 1659static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)1660{1661 struct sk_buff *skb = *pskb;1662 struct slave *slave;1663 struct bonding *bond;1664 int (*recv_probe)(const struct sk_buff *, struct bonding *,1665 struct slave *);1666 int ret = RX_HANDLER_ANOTHER;1667 1668 skb = skb_share_check(skb, GFP_ATOMIC);1669 if (unlikely(!skb))1670 return RX_HANDLER_CONSUMED;1671 1672 *pskb = skb;1673 1674 slave = bond_slave_get_rcu(skb->dev);1675 bond = slave->bond;1676 1677 recv_probe = READ_ONCE(bond->recv_probe);1678 if (recv_probe) {1679 ret = recv_probe(skb, bond, slave);1680 if (ret == RX_HANDLER_CONSUMED) {1681 consume_skb(skb);1682 return ret;1683 }1684 }1685 1686 /*1687 * For packets determined by bond_should_deliver_exact_match() call to1688 * be suppressed we want to make an exception for link-local packets.1689 * This is necessary for e.g. LLDP daemons to be able to monitor1690 * inactive slave links without being forced to bind to them1691 * explicitly.1692 *1693 * At the same time, packets that are passed to the bonding master1694 * (including link-local ones) can have their originating interface1695 * determined via PACKET_ORIGDEV socket option.1696 */1697 if (bond_should_deliver_exact_match(skb, slave, bond)) {1698 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))1699 return RX_HANDLER_PASS;1700 return RX_HANDLER_EXACT;1701 }1702 1703 skb->dev = bond->dev;1704 1705 if (BOND_MODE(bond) == BOND_MODE_ALB &&1706 netif_is_bridge_port(bond->dev) &&1707 skb->pkt_type == PACKET_HOST) {1708 1709 if (unlikely(skb_cow_head(skb,1710 skb->data - skb_mac_header(skb)))) {1711 kfree_skb(skb);1712 return RX_HANDLER_CONSUMED;1713 }1714 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,1715 bond->dev->addr_len);1716 }1717 1718 return ret;1719}1720 1721static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)1722{1723 switch (BOND_MODE(bond)) {1724 case BOND_MODE_ROUNDROBIN:1725 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;1726 case BOND_MODE_ACTIVEBACKUP:1727 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;1728 case BOND_MODE_BROADCAST:1729 return NETDEV_LAG_TX_TYPE_BROADCAST;1730 case BOND_MODE_XOR:1731 case BOND_MODE_8023AD:1732 return NETDEV_LAG_TX_TYPE_HASH;1733 default:1734 return NETDEV_LAG_TX_TYPE_UNKNOWN;1735 }1736}1737 1738static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,1739 enum netdev_lag_tx_type type)1740{1741 if (type != NETDEV_LAG_TX_TYPE_HASH)1742 return NETDEV_LAG_HASH_NONE;1743 1744 switch (bond->params.xmit_policy) {1745 case BOND_XMIT_POLICY_LAYER2:1746 return NETDEV_LAG_HASH_L2;1747 case BOND_XMIT_POLICY_LAYER34:1748 return NETDEV_LAG_HASH_L34;1749 case BOND_XMIT_POLICY_LAYER23:1750 return NETDEV_LAG_HASH_L23;1751 case BOND_XMIT_POLICY_ENCAP23:1752 return NETDEV_LAG_HASH_E23;1753 case BOND_XMIT_POLICY_ENCAP34:1754 return NETDEV_LAG_HASH_E34;1755 case BOND_XMIT_POLICY_VLAN_SRCMAC:1756 return NETDEV_LAG_HASH_VLAN_SRCMAC;1757 default:1758 return NETDEV_LAG_HASH_UNKNOWN;1759 }1760}1761 1762static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,1763 struct netlink_ext_ack *extack)1764{1765 struct netdev_lag_upper_info lag_upper_info;1766 enum netdev_lag_tx_type type;1767 int err;1768 1769 type = bond_lag_tx_type(bond);1770 lag_upper_info.tx_type = type;1771 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);1772 1773 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,1774 &lag_upper_info, extack);1775 if (err)1776 return err;1777 1778 slave->dev->flags |= IFF_SLAVE;1779 return 0;1780}1781 1782static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)1783{1784 netdev_upper_dev_unlink(slave->dev, bond->dev);1785 slave->dev->flags &= ~IFF_SLAVE;1786}1787 1788static void slave_kobj_release(struct kobject *kobj)1789{1790 struct slave *slave = to_slave(kobj);1791 struct bonding *bond = bond_get_bond_by_slave(slave);1792 1793 cancel_delayed_work_sync(&slave->notify_work);1794 if (BOND_MODE(bond) == BOND_MODE_8023AD)1795 kfree(SLAVE_AD_INFO(slave));1796 1797 kfree(slave);1798}1799 1800static struct kobj_type slave_ktype = {1801 .release = slave_kobj_release,1802#ifdef CONFIG_SYSFS1803 .sysfs_ops = &slave_sysfs_ops,1804#endif1805};1806 1807static int bond_kobj_init(struct slave *slave)1808{1809 int err;1810 1811 err = kobject_init_and_add(&slave->kobj, &slave_ktype,1812 &(slave->dev->dev.kobj), "bonding_slave");1813 if (err)1814 kobject_put(&slave->kobj);1815 1816 return err;1817}1818 1819static struct slave *bond_alloc_slave(struct bonding *bond,1820 struct net_device *slave_dev)1821{1822 struct slave *slave = NULL;1823 1824 slave = kzalloc(sizeof(*slave), GFP_KERNEL);1825 if (!slave)1826 return NULL;1827 1828 slave->bond = bond;1829 slave->dev = slave_dev;1830 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);1831 1832 if (bond_kobj_init(slave))1833 return NULL;1834 1835 if (BOND_MODE(bond) == BOND_MODE_8023AD) {1836 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),1837 GFP_KERNEL);1838 if (!SLAVE_AD_INFO(slave)) {1839 kobject_put(&slave->kobj);1840 return NULL;1841 }1842 }1843 1844 return slave;1845}1846 1847static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)1848{1849 info->bond_mode = BOND_MODE(bond);1850 info->miimon = bond->params.miimon;1851 info->num_slaves = bond->slave_cnt;1852}1853 1854static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)1855{1856 strcpy(info->slave_name, slave->dev->name);1857 info->link = slave->link;1858 info->state = bond_slave_state(slave);1859 info->link_failure_count = slave->link_failure_count;1860}1861 1862static void bond_netdev_notify_work(struct work_struct *_work)1863{1864 struct slave *slave = container_of(_work, struct slave,1865 notify_work.work);1866 1867 if (rtnl_trylock()) {1868 struct netdev_bonding_info binfo;1869 1870 bond_fill_ifslave(slave, &binfo.slave);1871 bond_fill_ifbond(slave->bond, &binfo.master);1872 netdev_bonding_info_change(slave->dev, &binfo);1873 rtnl_unlock();1874 } else {1875 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);1876 }1877}1878 1879void bond_queue_slave_event(struct slave *slave)1880{1881 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);1882}1883 1884void bond_lower_state_changed(struct slave *slave)1885{1886 struct netdev_lag_lower_state_info info;1887 1888 info.link_up = slave->link == BOND_LINK_UP ||1889 slave->link == BOND_LINK_FAIL;1890 info.tx_enabled = bond_is_active_slave(slave);1891 netdev_lower_state_changed(slave->dev, &info);1892}1893 1894#define BOND_NL_ERR(bond_dev, extack, errmsg) do { \1895 if (extack) \1896 NL_SET_ERR_MSG(extack, errmsg); \1897 else \1898 netdev_err(bond_dev, "Error: %s\n", errmsg); \1899} while (0)1900 1901#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \1902 if (extack) \1903 NL_SET_ERR_MSG(extack, errmsg); \1904 else \1905 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \1906} while (0)1907 1908/* The bonding driver uses ether_setup() to convert a master bond device1909 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always1910 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP1911 * if they were set1912 */1913static void bond_ether_setup(struct net_device *bond_dev)1914{1915 unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP);1916 1917 ether_setup(bond_dev);1918 bond_dev->flags |= IFF_MASTER | flags;1919 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;1920}1921 1922void bond_xdp_set_features(struct net_device *bond_dev)1923{1924 struct bonding *bond = netdev_priv(bond_dev);1925 xdp_features_t val = NETDEV_XDP_ACT_MASK;1926 struct list_head *iter;1927 struct slave *slave;1928 1929 ASSERT_RTNL();1930 1931 if (!bond_xdp_check(bond) || !bond_has_slaves(bond)) {1932 xdp_clear_features_flag(bond_dev);1933 return;1934 }1935 1936 bond_for_each_slave(bond, slave, iter)1937 val &= slave->dev->xdp_features;1938 1939 val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY;1940 1941 xdp_set_features_flag(bond_dev, val);1942}1943 1944/* enslave device <slave> to bond device <master> */1945int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,1946 struct netlink_ext_ack *extack)1947{1948 struct bonding *bond = netdev_priv(bond_dev);1949 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;1950 struct slave *new_slave = NULL, *prev_slave;1951 struct sockaddr_storage ss;1952 int link_reporting;1953 int res = 0, i;1954 1955 if (slave_dev->flags & IFF_MASTER &&1956 !netif_is_bond_master(slave_dev)) {1957 BOND_NL_ERR(bond_dev, extack,1958 "Device type (master device) cannot be enslaved");1959 return -EPERM;1960 }1961 1962 if (!bond->params.use_carrier &&1963 slave_dev->ethtool_ops->get_link == NULL &&1964 slave_ops->ndo_eth_ioctl == NULL) {1965 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");1966 }1967 1968 /* already in-use? */1969 if (netdev_is_rx_handler_busy(slave_dev)) {1970 SLAVE_NL_ERR(bond_dev, slave_dev, extack,1971 "Device is in use and cannot be enslaved");1972 return -EBUSY;1973 }1974 1975 if (bond_dev == slave_dev) {1976 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself.");1977 return -EPERM;1978 }1979 1980 /* vlan challenged mutual exclusion */1981 /* no need to lock since we're protected by rtnl_lock */1982 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {1983 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");1984 if (vlan_uses_dev(bond_dev)) {1985 SLAVE_NL_ERR(bond_dev, slave_dev, extack,1986 "Can not enslave VLAN challenged device to VLAN enabled bond");1987 return -EPERM;1988 } else {1989 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");1990 }1991 } else {1992 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");1993 }1994 1995 if (slave_dev->features & NETIF_F_HW_ESP)1996 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");1997 1998 /* Old ifenslave binaries are no longer supported. These can1999 * be identified with moderate accuracy by the state of the slave:2000 * the current ifenslave will set the interface down prior to2001 * enslaving it; the old ifenslave will not.2002 */2003 if (slave_dev->flags & IFF_UP) {2004 SLAVE_NL_ERR(bond_dev, slave_dev, extack,2005 "Device can not be enslaved while up");2006 return -EPERM;2007 }2008 2009 /* set bonding device ether type by slave - bonding netdevices are2010 * created with ether_setup, so when the slave type is not ARPHRD_ETHER2011 * there is a need to override some of the type dependent attribs/funcs.2012 *2013 * bond ether type mutual exclusion - don't allow slaves of dissimilar2014 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond2015 */2016 if (!bond_has_slaves(bond)) {2017 if (bond_dev->type != slave_dev->type) {2018 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",2019 bond_dev->type, slave_dev->type);2020 2021 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,2022 bond_dev);2023 res = notifier_to_errno(res);2024 if (res) {2025 slave_err(bond_dev, slave_dev, "refused to change device type\n");2026 return -EBUSY;2027 }2028 2029 /* Flush unicast and multicast addresses */2030 dev_uc_flush(bond_dev);2031 dev_mc_flush(bond_dev);2032 2033 if (slave_dev->type != ARPHRD_ETHER)2034 bond_setup_by_slave(bond_dev, slave_dev);2035 else2036 bond_ether_setup(bond_dev);2037 2038 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,2039 bond_dev);2040 }2041 } else if (bond_dev->type != slave_dev->type) {2042 SLAVE_NL_ERR(bond_dev, slave_dev, extack,2043 "Device type is different from other slaves");2044 return -EINVAL;2045 }2046 2047 if (slave_dev->type == ARPHRD_INFINIBAND &&2048 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {2049 SLAVE_NL_ERR(bond_dev, slave_dev, extack,2050 "Only active-backup mode is supported for infiniband slaves");2051 res = -EOPNOTSUPP;2052 goto err_undo_flags;2053 }2054 2055 if (!slave_ops->ndo_set_mac_address ||2056 slave_dev->type == ARPHRD_INFINIBAND) {2057 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");2058 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&2059 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {2060 if (!bond_has_slaves(bond)) {2061 bond->params.fail_over_mac = BOND_FOM_ACTIVE;2062 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");2063 } else {2064 SLAVE_NL_ERR(bond_dev, slave_dev, extack,2065 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");2066 res = -EOPNOTSUPP;2067 goto err_undo_flags;2068 }2069 }2070 }2071 2072 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);2073 2074 /* If this is the first slave, then we need to set the master's hardware2075 * address to be the same as the slave's.2076 */2077 if (!bond_has_slaves(bond) &&2078 bond->dev->addr_assign_type == NET_ADDR_RANDOM) {2079 res = bond_set_dev_addr(bond->dev, slave_dev);2080 if (res)2081 goto err_undo_flags;2082 }2083 2084 new_slave = bond_alloc_slave(bond, slave_dev);2085 if (!new_slave) {2086 res = -ENOMEM;2087 goto err_undo_flags;2088 }2089 2090 /* Set the new_slave's queue_id to be zero. Queue ID mapping2091 * is set via sysfs or module option if desired.2092 */2093 new_slave->queue_id = 0;2094 2095 /* Save slave's original mtu and then set it to match the bond */2096 new_slave->original_mtu = slave_dev->mtu;2097 res = dev_set_mtu(slave_dev, bond->dev->mtu);2098 if (res) {2099 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);2100 goto err_free;2101 }2102 2103 /* Save slave's original ("permanent") mac address for modes2104 * that need it, and for restoring it upon release, and then2105 * set it to the master's address2106 */2107 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,2108 slave_dev->addr_len);2109 2110 if (!bond->params.fail_over_mac ||2111 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {2112 /* Set slave to master's mac address. The application already2113 * set the master's mac address to that of the first slave2114 */2115 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);2116 ss.ss_family = slave_dev->type;2117 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,2118 extack);2119 if (res) {2120 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);2121 goto err_restore_mtu;2122 }2123 }2124 2125 /* set no_addrconf flag before open to prevent IPv6 addrconf */2126 slave_dev->priv_flags |= IFF_NO_ADDRCONF;2127 2128 /* open the slave since the application closed it */2129 res = dev_open(slave_dev, extack);2130 if (res) {2131 slave_err(bond_dev, slave_dev, "Opening slave failed\n");2132 goto err_restore_mac;2133 }2134 2135 slave_dev->priv_flags |= IFF_BONDING;2136 /* initialize slave stats */2137 dev_get_stats(new_slave->dev, &new_slave->slave_stats);2138 2139 if (bond_is_lb(bond)) {2140 /* bond_alb_init_slave() must be called before all other stages since2141 * it might fail and we do not want to have to undo everything2142 */2143 res = bond_alb_init_slave(bond, new_slave);2144 if (res)2145 goto err_close;2146 }2147 2148 res = vlan_vids_add_by_dev(slave_dev, bond_dev);2149 if (res) {2150 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");2151 goto err_close;2152 }2153 2154 prev_slave = bond_last_slave(bond);2155 2156 new_slave->delay = 0;2157 new_slave->link_failure_count = 0;2158 2159 if (bond_update_speed_duplex(new_slave) &&2160 bond_needs_speed_duplex(bond))2161 new_slave->link = BOND_LINK_DOWN;2162 2163 new_slave->last_rx = jiffies -2164 (msecs_to_jiffies(bond->params.arp_interval) + 1);2165 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)2166 new_slave->target_last_arp_rx[i] = new_slave->last_rx;2167 2168 new_slave->last_tx = new_slave->last_rx;2169 2170 if (bond->params.miimon && !bond->params.use_carrier) {2171 link_reporting = bond_check_dev_link(bond, slave_dev, 1);2172 2173 if ((link_reporting == -1) && !bond->params.arp_interval) {2174 /* miimon is set but a bonded network driver2175 * does not support ETHTOOL/MII and2176 * arp_interval is not set. Note: if2177 * use_carrier is enabled, we will never go2178 * here (because netif_carrier is always2179 * supported); thus, we don't need to change2180 * the messages for netif_carrier.2181 */2182 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");2183 } else if (link_reporting == -1) {2184 /* unable get link status using mii/ethtool */2185 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");2186 }2187 }2188 2189 /* check for initial state */2190 new_slave->link = BOND_LINK_NOCHANGE;2191 if (bond->params.miimon) {2192 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {2193 if (bond->params.updelay) {2194 bond_set_slave_link_state(new_slave,2195 BOND_LINK_BACK,2196 BOND_SLAVE_NOTIFY_NOW);2197 new_slave->delay = bond->params.updelay;2198 } else {2199 bond_set_slave_link_state(new_slave,2200 BOND_LINK_UP,2201 BOND_SLAVE_NOTIFY_NOW);2202 }2203 } else {2204 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,2205 BOND_SLAVE_NOTIFY_NOW);2206 }2207 } else if (bond->params.arp_interval) {2208 bond_set_slave_link_state(new_slave,2209 (netif_carrier_ok(slave_dev) ?2210 BOND_LINK_UP : BOND_LINK_DOWN),2211 BOND_SLAVE_NOTIFY_NOW);2212 } else {2213 bond_set_slave_link_state(new_slave, BOND_LINK_UP,2214 BOND_SLAVE_NOTIFY_NOW);2215 }2216 2217 if (new_slave->link != BOND_LINK_DOWN)2218 new_slave->last_link_up = jiffies;2219 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",2220 new_slave->link == BOND_LINK_DOWN ? "DOWN" :2221 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));2222 2223 if (bond_uses_primary(bond) && bond->params.primary[0]) {2224 /* if there is a primary slave, remember it */2225 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {2226 rcu_assign_pointer(bond->primary_slave, new_slave);2227 bond->force_primary = true;2228 }2229 }2230 2231 switch (BOND_MODE(bond)) {2232 case BOND_MODE_ACTIVEBACKUP:2233 bond_set_slave_inactive_flags(new_slave,2234 BOND_SLAVE_NOTIFY_NOW);2235 break;2236 case BOND_MODE_8023AD:2237 /* in 802.3ad mode, the internal mechanism2238 * will activate the slaves in the selected2239 * aggregator2240 */2241 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);2242 /* if this is the first slave */2243 if (!prev_slave) {2244 SLAVE_AD_INFO(new_slave)->id = 1;2245 /* Initialize AD with the number of times that the AD timer is called in 1 second2246 * can be called only after the mac address of the bond is set2247 */2248 bond_3ad_initialize(bond);2249 } else {2250 SLAVE_AD_INFO(new_slave)->id =2251 SLAVE_AD_INFO(prev_slave)->id + 1;2252 }2253 2254 bond_3ad_bind_slave(new_slave);2255 break;2256 case BOND_MODE_TLB:2257 case BOND_MODE_ALB:2258 bond_set_active_slave(new_slave);2259 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);2260 break;2261 default:2262 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");2263 2264 /* always active in trunk mode */2265 bond_set_active_slave(new_slave);2266 2267 /* In trunking mode there is little meaning to curr_active_slave2268 * anyway (it holds no special properties of the bond device),2269 * so we can change it without calling change_active_interface()2270 */2271 if (!rcu_access_pointer(bond->curr_active_slave) &&2272 new_slave->link == BOND_LINK_UP)2273 rcu_assign_pointer(bond->curr_active_slave, new_slave);2274 2275 break;2276 } /* switch(bond_mode) */2277 2278#ifdef CONFIG_NET_POLL_CONTROLLER2279 if (bond->dev->npinfo) {2280 if (slave_enable_netpoll(new_slave)) {2281 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");2282 res = -EBUSY;2283 goto err_detach;2284 }2285 }2286#endif2287 2288 if (!(bond_dev->features & NETIF_F_LRO))2289 dev_disable_lro(slave_dev);2290 2291 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,2292 new_slave);2293 if (res) {2294 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);2295 goto err_detach;2296 }2297 2298 res = bond_master_upper_dev_link(bond, new_slave, extack);2299 if (res) {2300 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);2301 goto err_unregister;2302 }2303 2304 bond_lower_state_changed(new_slave);2305 2306 res = bond_sysfs_slave_add(new_slave);2307 if (res) {2308 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);2309 goto err_upper_unlink;2310 }2311 2312 /* If the mode uses primary, then the following is handled by2313 * bond_change_active_slave().2314 */2315 if (!bond_uses_primary(bond)) {2316 /* set promiscuity level to new slave */2317 if (bond_dev->flags & IFF_PROMISC) {2318 res = dev_set_promiscuity(slave_dev, 1);2319 if (res)2320 goto err_sysfs_del;2321 }2322 2323 /* set allmulti level to new slave */2324 if (bond_dev->flags & IFF_ALLMULTI) {2325 res = dev_set_allmulti(slave_dev, 1);2326 if (res) {2327 if (bond_dev->flags & IFF_PROMISC)2328 dev_set_promiscuity(slave_dev, -1);2329 goto err_sysfs_del;2330 }2331 }2332 2333 if (bond_dev->flags & IFF_UP) {2334 netif_addr_lock_bh(bond_dev);2335 dev_mc_sync_multiple(slave_dev, bond_dev);2336 dev_uc_sync_multiple(slave_dev, bond_dev);2337 netif_addr_unlock_bh(bond_dev);2338 2339 if (BOND_MODE(bond) == BOND_MODE_8023AD)2340 dev_mc_add(slave_dev, lacpdu_mcast_addr);2341 }2342 }2343 2344 bond->slave_cnt++;2345 bond_compute_features(bond);2346 bond_set_carrier(bond);2347 2348 /* Needs to be called before bond_select_active_slave(), which will2349 * remove the maddrs if the slave is selected as active slave.2350 */2351 bond_slave_ns_maddrs_add(bond, new_slave);2352 2353 if (bond_uses_primary(bond)) {2354 block_netpoll_tx();2355 bond_select_active_slave(bond);2356 unblock_netpoll_tx();2357 }2358 2359 if (bond_mode_can_use_xmit_hash(bond))2360 bond_update_slave_arr(bond, NULL);2361 2362 if (!slave_dev->netdev_ops->ndo_bpf ||2363 !slave_dev->netdev_ops->ndo_xdp_xmit) {2364 if (bond->xdp_prog) {2365 SLAVE_NL_ERR(bond_dev, slave_dev, extack,2366 "Slave does not support XDP");2367 res = -EOPNOTSUPP;2368 goto err_sysfs_del;2369 }2370 } else if (bond->xdp_prog) {2371 struct netdev_bpf xdp = {2372 .command = XDP_SETUP_PROG,2373 .flags = 0,2374 .prog = bond->xdp_prog,2375 .extack = extack,2376 };2377 2378 if (dev_xdp_prog_count(slave_dev) > 0) {2379 SLAVE_NL_ERR(bond_dev, slave_dev, extack,2380 "Slave has XDP program loaded, please unload before enslaving");2381 res = -EOPNOTSUPP;2382 goto err_sysfs_del;2383 }2384 2385 res = dev_xdp_propagate(slave_dev, &xdp);2386 if (res < 0) {2387 /* ndo_bpf() sets extack error message */2388 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res);2389 goto err_sysfs_del;2390 }2391 if (bond->xdp_prog)2392 bpf_prog_inc(bond->xdp_prog);2393 }2394 2395 bond_xdp_set_features(bond_dev);2396 2397 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",2398 bond_is_active_slave(new_slave) ? "an active" : "a backup",2399 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");2400 2401 /* enslave is successful */2402 bond_queue_slave_event(new_slave);2403 return 0;2404 2405/* Undo stages on error */2406err_sysfs_del:2407 bond_sysfs_slave_del(new_slave);2408 2409err_upper_unlink:2410 bond_upper_dev_unlink(bond, new_slave);2411 2412err_unregister:2413 netdev_rx_handler_unregister(slave_dev);2414 2415err_detach:2416 vlan_vids_del_by_dev(slave_dev, bond_dev);2417 if (rcu_access_pointer(bond->primary_slave) == new_slave)2418 RCU_INIT_POINTER(bond->primary_slave, NULL);2419 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {2420 block_netpoll_tx();2421 bond_change_active_slave(bond, NULL);2422 bond_select_active_slave(bond);2423 unblock_netpoll_tx();2424 }2425 /* either primary_slave or curr_active_slave might've changed */2426 synchronize_rcu();2427 slave_disable_netpoll(new_slave);2428 2429err_close:2430 if (!netif_is_bond_master(slave_dev))2431 slave_dev->priv_flags &= ~IFF_BONDING;2432 dev_close(slave_dev);2433 2434err_restore_mac:2435 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;2436 if (!bond->params.fail_over_mac ||2437 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {2438 /* XXX TODO - fom follow mode needs to change master's2439 * MAC if this slave's MAC is in use by the bond, or at2440 * least print a warning.2441 */2442 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,2443 new_slave->dev->addr_len);2444 ss.ss_family = slave_dev->type;2445 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);2446 }2447 2448err_restore_mtu:2449 dev_set_mtu(slave_dev, new_slave->original_mtu);2450 2451err_free:2452 kobject_put(&new_slave->kobj);2453 2454err_undo_flags:2455 /* Enslave of first slave has failed and we need to fix master's mac */2456 if (!bond_has_slaves(bond)) {2457 if (ether_addr_equal_64bits(bond_dev->dev_addr,2458 slave_dev->dev_addr))2459 eth_hw_addr_random(bond_dev);2460 if (bond_dev->type != ARPHRD_ETHER) {2461 dev_close(bond_dev);2462 bond_ether_setup(bond_dev);2463 }2464 }2465 2466 return res;2467}2468 2469/* Try to release the slave device <slave> from the bond device <master>2470 * It is legal to access curr_active_slave without a lock because all the function2471 * is RTNL-locked. If "all" is true it means that the function is being called2472 * while destroying a bond interface and all slaves are being released.2473 *2474 * The rules for slave state should be:2475 * for Active/Backup:2476 * Active stays on all backups go down2477 * for Bonded connections:2478 * The first up interface should be left on and all others downed.2479 */2480static int __bond_release_one(struct net_device *bond_dev,2481 struct net_device *slave_dev,2482 bool all, bool unregister)2483{2484 struct bonding *bond = netdev_priv(bond_dev);2485 struct slave *slave, *oldcurrent;2486 struct sockaddr_storage ss;2487 int old_flags = bond_dev->flags;2488 netdev_features_t old_features = bond_dev->features;2489 2490 /* slave is not a slave or master is not master of this slave */2491 if (!(slave_dev->flags & IFF_SLAVE) ||2492 !netdev_has_upper_dev(slave_dev, bond_dev)) {2493 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");2494 return -EINVAL;2495 }2496 2497 block_netpoll_tx();2498 2499 slave = bond_get_slave_by_dev(bond, slave_dev);2500 if (!slave) {2501 /* not a slave of this bond */2502 slave_info(bond_dev, slave_dev, "interface not enslaved\n");2503 unblock_netpoll_tx();2504 return -EINVAL;2505 }2506 2507 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);2508 2509 bond_sysfs_slave_del(slave);2510 2511 /* recompute stats just before removing the slave */2512 bond_get_stats(bond->dev, &bond->bond_stats);2513 2514 if (bond->xdp_prog) {2515 struct netdev_bpf xdp = {2516 .command = XDP_SETUP_PROG,2517 .flags = 0,2518 .prog = NULL,2519 .extack = NULL,2520 };2521 if (dev_xdp_propagate(slave_dev, &xdp))2522 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n");2523 }2524 2525 /* unregister rx_handler early so bond_handle_frame wouldn't be called2526 * for this slave anymore.2527 */2528 netdev_rx_handler_unregister(slave_dev);2529 2530 if (BOND_MODE(bond) == BOND_MODE_8023AD)2531 bond_3ad_unbind_slave(slave);2532 2533 bond_upper_dev_unlink(bond, slave);2534 2535 if (bond_mode_can_use_xmit_hash(bond))2536 bond_update_slave_arr(bond, slave);2537 2538 slave_info(bond_dev, slave_dev, "Releasing %s interface\n",2539 bond_is_active_slave(slave) ? "active" : "backup");2540 2541 oldcurrent = rcu_access_pointer(bond->curr_active_slave);2542 2543 RCU_INIT_POINTER(bond->current_arp_slave, NULL);2544 2545 if (!all && (!bond->params.fail_over_mac ||2546 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {2547 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&2548 bond_has_slaves(bond))2549 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",2550 slave->perm_hwaddr);2551 }2552 2553 if (rtnl_dereference(bond->primary_slave) == slave)2554 RCU_INIT_POINTER(bond->primary_slave, NULL);2555 2556 if (oldcurrent == slave)2557 bond_change_active_slave(bond, NULL);2558 2559 /* Must be called after bond_change_active_slave () as the slave2560 * might change from an active slave to a backup slave. Then it is2561 * necessary to clear the maddrs on the backup slave.2562 */2563 bond_slave_ns_maddrs_del(bond, slave);2564 2565 if (bond_is_lb(bond)) {2566 /* Must be called only after the slave has been2567 * detached from the list and the curr_active_slave2568 * has been cleared (if our_slave == old_current),2569 * but before a new active slave is selected.2570 */2571 bond_alb_deinit_slave(bond, slave);2572 }2573 2574 if (all) {2575 RCU_INIT_POINTER(bond->curr_active_slave, NULL);2576 } else if (oldcurrent == slave) {2577 /* Note that we hold RTNL over this sequence, so there2578 * is no concern that another slave add/remove event2579 * will interfere.2580 */2581 bond_select_active_slave(bond);2582 }2583 2584 bond_set_carrier(bond);2585 if (!bond_has_slaves(bond))2586 eth_hw_addr_random(bond_dev);2587 2588 unblock_netpoll_tx();2589 synchronize_rcu();2590 bond->slave_cnt--;2591 2592 if (!bond_has_slaves(bond)) {2593 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);2594 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);2595 }2596 2597 bond_compute_features(bond);2598 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&2599 (old_features & NETIF_F_VLAN_CHALLENGED))2600 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");2601 2602 vlan_vids_del_by_dev(slave_dev, bond_dev);2603 2604 /* If the mode uses primary, then this case was handled above by2605 * bond_change_active_slave(..., NULL)2606 */2607 if (!bond_uses_primary(bond)) {2608 /* unset promiscuity level from slave2609 * NOTE: The NETDEV_CHANGEADDR call above may change the value2610 * of the IFF_PROMISC flag in the bond_dev, but we need the2611 * value of that flag before that change, as that was the value2612 * when this slave was attached, so we cache at the start of the2613 * function and use it here. Same goes for ALLMULTI below2614 */2615 if (old_flags & IFF_PROMISC)2616 dev_set_promiscuity(slave_dev, -1);2617 2618 /* unset allmulti level from slave */2619 if (old_flags & IFF_ALLMULTI)2620 dev_set_allmulti(slave_dev, -1);2621 2622 if (old_flags & IFF_UP)2623 bond_hw_addr_flush(bond_dev, slave_dev);2624 }2625 2626 slave_disable_netpoll(slave);2627 2628 /* close slave before restoring its mac address */2629 dev_close(slave_dev);2630 2631 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;2632 2633 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||2634 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {2635 /* restore original ("permanent") mac address */2636 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,2637 slave->dev->addr_len);2638 ss.ss_family = slave_dev->type;2639 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);2640 }2641 2642 if (unregister)2643 __dev_set_mtu(slave_dev, slave->original_mtu);2644 else2645 dev_set_mtu(slave_dev, slave->original_mtu);2646 2647 if (!netif_is_bond_master(slave_dev))2648 slave_dev->priv_flags &= ~IFF_BONDING;2649 2650 bond_xdp_set_features(bond_dev);2651 kobject_put(&slave->kobj);2652 2653 return 0;2654}2655 2656/* A wrapper used because of ndo_del_link */2657int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)2658{2659 return __bond_release_one(bond_dev, slave_dev, false, false);2660}2661 2662/* First release a slave and then destroy the bond if no more slaves are left.2663 * Must be under rtnl_lock when this function is called.2664 */2665static int bond_release_and_destroy(struct net_device *bond_dev,2666 struct net_device *slave_dev)2667{2668 struct bonding *bond = netdev_priv(bond_dev);2669 int ret;2670 2671 ret = __bond_release_one(bond_dev, slave_dev, false, true);2672 if (ret == 0 && !bond_has_slaves(bond) &&2673 bond_dev->reg_state != NETREG_UNREGISTERING) {2674 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;2675 netdev_info(bond_dev, "Destroying bond\n");2676 bond_remove_proc_entry(bond);2677 unregister_netdevice(bond_dev);2678 }2679 return ret;2680}2681 2682static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)2683{2684 struct bonding *bond = netdev_priv(bond_dev);2685 2686 bond_fill_ifbond(bond, info);2687}2688 2689static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)2690{2691 struct bonding *bond = netdev_priv(bond_dev);2692 struct list_head *iter;2693 int i = 0, res = -ENODEV;2694 struct slave *slave;2695 2696 bond_for_each_slave(bond, slave, iter) {2697 if (i++ == (int)info->slave_id) {2698 res = 0;2699 bond_fill_ifslave(slave, info);2700 break;2701 }2702 }2703 2704 return res;2705}2706 2707/*-------------------------------- Monitoring -------------------------------*/2708 2709/* called with rcu_read_lock() */2710static int bond_miimon_inspect(struct bonding *bond)2711{2712 bool ignore_updelay = false;2713 int link_state, commit = 0;2714 struct list_head *iter;2715 struct slave *slave;2716 2717 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {2718 ignore_updelay = !rcu_dereference(bond->curr_active_slave);2719 } else {2720 struct bond_up_slave *usable_slaves;2721 2722 usable_slaves = rcu_dereference(bond->usable_slaves);2723 2724 if (usable_slaves && usable_slaves->count == 0)2725 ignore_updelay = true;2726 }2727 2728 bond_for_each_slave_rcu(bond, slave, iter) {2729 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);2730 2731 link_state = bond_check_dev_link(bond, slave->dev, 0);2732 2733 switch (slave->link) {2734 case BOND_LINK_UP:2735 if (link_state)2736 continue;2737 2738 bond_propose_link_state(slave, BOND_LINK_FAIL);2739 commit++;2740 slave->delay = bond->params.downdelay;2741 if (slave->delay && net_ratelimit()) {2742 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",2743 (BOND_MODE(bond) ==2744 BOND_MODE_ACTIVEBACKUP) ?2745 (bond_is_active_slave(slave) ?2746 "active " : "backup ") : "",2747 bond->params.downdelay * bond->params.miimon);2748 }2749 fallthrough;2750 case BOND_LINK_FAIL:2751 if (link_state) {2752 /* recovered before downdelay expired */2753 bond_propose_link_state(slave, BOND_LINK_UP);2754 slave->last_link_up = jiffies;2755 if (net_ratelimit())2756 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",2757 (bond->params.downdelay - slave->delay) *2758 bond->params.miimon);2759 commit++;2760 continue;2761 }2762 2763 if (slave->delay <= 0) {2764 bond_propose_link_state(slave, BOND_LINK_DOWN);2765 commit++;2766 continue;2767 }2768 2769 slave->delay--;2770 break;2771 2772 case BOND_LINK_DOWN:2773 if (!link_state)2774 continue;2775 2776 bond_propose_link_state(slave, BOND_LINK_BACK);2777 commit++;2778 slave->delay = bond->params.updelay;2779 2780 if (slave->delay && net_ratelimit()) {2781 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",2782 ignore_updelay ? 0 :2783 bond->params.updelay *2784 bond->params.miimon);2785 }2786 fallthrough;2787 case BOND_LINK_BACK:2788 if (!link_state) {2789 bond_propose_link_state(slave, BOND_LINK_DOWN);2790 if (net_ratelimit())2791 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",2792 (bond->params.updelay - slave->delay) *2793 bond->params.miimon);2794 commit++;2795 continue;2796 }2797 2798 if (ignore_updelay)2799 slave->delay = 0;2800 2801 if (slave->delay <= 0) {2802 bond_propose_link_state(slave, BOND_LINK_UP);2803 commit++;2804 ignore_updelay = false;2805 continue;2806 }2807 2808 slave->delay--;2809 break;2810 }2811 }2812 2813 return commit;2814}2815 2816static void bond_miimon_link_change(struct bonding *bond,2817 struct slave *slave,2818 char link)2819{2820 switch (BOND_MODE(bond)) {2821 case BOND_MODE_8023AD:2822 bond_3ad_handle_link_change(slave, link);2823 break;2824 case BOND_MODE_TLB:2825 case BOND_MODE_ALB:2826 bond_alb_handle_link_change(bond, slave, link);2827 break;2828 case BOND_MODE_XOR:2829 bond_update_slave_arr(bond, NULL);2830 break;2831 }2832}2833 2834static void bond_miimon_commit(struct bonding *bond)2835{2836 struct slave *slave, *primary, *active;2837 bool do_failover = false;2838 struct list_head *iter;2839 2840 ASSERT_RTNL();2841 2842 bond_for_each_slave(bond, slave, iter) {2843 switch (slave->link_new_state) {2844 case BOND_LINK_NOCHANGE:2845 /* For 802.3ad mode, check current slave speed and2846 * duplex again in case its port was disabled after2847 * invalid speed/duplex reporting but recovered before2848 * link monitoring could make a decision on the actual2849 * link status2850 */2851 if (BOND_MODE(bond) == BOND_MODE_8023AD &&2852 slave->link == BOND_LINK_UP)2853 bond_3ad_adapter_speed_duplex_changed(slave);2854 continue;2855 2856 case BOND_LINK_UP:2857 if (bond_update_speed_duplex(slave) &&2858 bond_needs_speed_duplex(bond)) {2859 slave->link = BOND_LINK_DOWN;2860 if (net_ratelimit())2861 slave_warn(bond->dev, slave->dev,2862 "failed to get link speed/duplex\n");2863 continue;2864 }2865 bond_set_slave_link_state(slave, BOND_LINK_UP,2866 BOND_SLAVE_NOTIFY_NOW);2867 slave->last_link_up = jiffies;2868 2869 primary = rtnl_dereference(bond->primary_slave);2870 if (BOND_MODE(bond) == BOND_MODE_8023AD) {2871 /* prevent it from being the active one */2872 bond_set_backup_slave(slave);2873 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {2874 /* make it immediately active */2875 bond_set_active_slave(slave);2876 }2877 2878 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",2879 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,2880 slave->duplex ? "full" : "half");2881 2882 bond_miimon_link_change(bond, slave, BOND_LINK_UP);2883 2884 active = rtnl_dereference(bond->curr_active_slave);2885 if (!active || slave == primary || slave->prio > active->prio)2886 do_failover = true;2887 2888 continue;2889 2890 case BOND_LINK_DOWN:2891 if (slave->link_failure_count < UINT_MAX)2892 slave->link_failure_count++;2893 2894 bond_set_slave_link_state(slave, BOND_LINK_DOWN,2895 BOND_SLAVE_NOTIFY_NOW);2896 2897 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||2898 BOND_MODE(bond) == BOND_MODE_8023AD)2899 bond_set_slave_inactive_flags(slave,2900 BOND_SLAVE_NOTIFY_NOW);2901 2902 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");2903 2904 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);2905 2906 if (slave == rcu_access_pointer(bond->curr_active_slave))2907 do_failover = true;2908 2909 continue;2910 2911 default:2912 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",2913 slave->link_new_state);2914 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);2915 2916 continue;2917 }2918 }2919 2920 if (do_failover) {2921 block_netpoll_tx();2922 bond_select_active_slave(bond);2923 unblock_netpoll_tx();2924 }2925 2926 bond_set_carrier(bond);2927}2928 2929/* bond_mii_monitor2930 *2931 * Really a wrapper that splits the mii monitor into two phases: an2932 * inspection, then (if inspection indicates something needs to be done)2933 * an acquisition of appropriate locks followed by a commit phase to2934 * implement whatever link state changes are indicated.2935 */2936static void bond_mii_monitor(struct work_struct *work)2937{2938 struct bonding *bond = container_of(work, struct bonding,2939 mii_work.work);2940 bool should_notify_peers = false;2941 bool commit;2942 unsigned long delay;2943 struct slave *slave;2944 struct list_head *iter;2945 2946 delay = msecs_to_jiffies(bond->params.miimon);2947 2948 if (!bond_has_slaves(bond))2949 goto re_arm;2950 2951 rcu_read_lock();2952 should_notify_peers = bond_should_notify_peers(bond);2953 commit = !!bond_miimon_inspect(bond);2954 if (bond->send_peer_notif) {2955 rcu_read_unlock();2956 if (rtnl_trylock()) {2957 bond->send_peer_notif--;2958 rtnl_unlock();2959 }2960 } else {2961 rcu_read_unlock();2962 }2963 2964 if (commit) {2965 /* Race avoidance with bond_close cancel of workqueue */2966 if (!rtnl_trylock()) {2967 delay = 1;2968 should_notify_peers = false;2969 goto re_arm;2970 }2971 2972 bond_for_each_slave(bond, slave, iter) {2973 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);2974 }2975 bond_miimon_commit(bond);2976 2977 rtnl_unlock(); /* might sleep, hold no other locks */2978 }2979 2980re_arm:2981 if (bond->params.miimon)2982 queue_delayed_work(bond->wq, &bond->mii_work, delay);2983 2984 if (should_notify_peers) {2985 if (!rtnl_trylock())2986 return;2987 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);2988 rtnl_unlock();2989 }2990}2991 2992static int bond_upper_dev_walk(struct net_device *upper,2993 struct netdev_nested_priv *priv)2994{2995 __be32 ip = *(__be32 *)priv->data;2996 2997 return ip == bond_confirm_addr(upper, 0, ip);2998}2999 3000static bool bond_has_this_ip(struct bonding *bond, __be32 ip)3001{3002 struct netdev_nested_priv priv = {3003 .data = (void *)&ip,3004 };3005 bool ret = false;3006 3007 if (ip == bond_confirm_addr(bond->dev, 0, ip))3008 return true;3009 3010 rcu_read_lock();3011 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))3012 ret = true;3013 rcu_read_unlock();3014 3015 return ret;3016}3017 3018#define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)3019 3020static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags,3021 struct sk_buff *skb)3022{3023 struct net_device *bond_dev = slave->bond->dev;3024 struct net_device *slave_dev = slave->dev;3025 struct bond_vlan_tag *outer_tag = tags;3026 3027 if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE)3028 return true;3029 3030 tags++;3031 3032 /* Go through all the tags backwards and add them to the packet */3033 while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) {3034 if (!tags->vlan_id) {3035 tags++;3036 continue;3037 }3038 3039 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",3040 ntohs(outer_tag->vlan_proto), tags->vlan_id);3041 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,3042 tags->vlan_id);3043 if (!skb) {3044 net_err_ratelimited("failed to insert inner VLAN tag\n");3045 return false;3046 }3047 3048 tags++;3049 }3050 /* Set the outer tag */3051 if (outer_tag->vlan_id) {3052 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",3053 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);3054 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,3055 outer_tag->vlan_id);3056 }3057 3058 return true;3059}3060 3061/* We go to the (large) trouble of VLAN tagging ARP frames because3062 * switches in VLAN mode (especially if ports are configured as3063 * "native" to a VLAN) might not pass non-tagged frames.3064 */3065static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,3066 __be32 src_ip, struct bond_vlan_tag *tags)3067{3068 struct net_device *bond_dev = slave->bond->dev;3069 struct net_device *slave_dev = slave->dev;3070 struct sk_buff *skb;3071 3072 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",3073 arp_op, &dest_ip, &src_ip);3074 3075 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,3076 NULL, slave_dev->dev_addr, NULL);3077 3078 if (!skb) {3079 net_err_ratelimited("ARP packet allocation failed\n");3080 return;3081 }3082 3083 if (bond_handle_vlan(slave, tags, skb)) {3084 slave_update_last_tx(slave);3085 arp_xmit(skb);3086 }3087 3088 return;3089}3090 3091/* Validate the device path between the @start_dev and the @end_dev.3092 * The path is valid if the @end_dev is reachable through device3093 * stacking.3094 * When the path is validated, collect any vlan information in the3095 * path.3096 */3097struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,3098 struct net_device *end_dev,3099 int level)3100{3101 struct bond_vlan_tag *tags;3102 struct net_device *upper;3103 struct list_head *iter;3104 3105 if (start_dev == end_dev) {3106 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);3107 if (!tags)3108 return ERR_PTR(-ENOMEM);3109 tags[level].vlan_proto = BOND_VLAN_PROTO_NONE;3110 return tags;3111 }3112 3113 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {3114 tags = bond_verify_device_path(upper, end_dev, level + 1);3115 if (IS_ERR_OR_NULL(tags)) {3116 if (IS_ERR(tags))3117 return tags;3118 continue;3119 }3120 if (is_vlan_dev(upper)) {3121 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);3122 tags[level].vlan_id = vlan_dev_vlan_id(upper);3123 }3124 3125 return tags;3126 }3127 3128 return NULL;3129}3130 3131static void bond_arp_send_all(struct bonding *bond, struct slave *slave)3132{3133 struct rtable *rt;3134 struct bond_vlan_tag *tags;3135 __be32 *targets = bond->params.arp_targets, addr;3136 int i;3137 3138 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {3139 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",3140 __func__, &targets[i]);3141 tags = NULL;3142 3143 /* Find out through which dev should the packet go */3144 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 0, 0,3145 RT_SCOPE_LINK);3146 if (IS_ERR(rt)) {3147 /* there's no route to target - try to send arp3148 * probe to generate any traffic (arp_validate=0)3149 */3150 if (bond->params.arp_validate)3151 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",3152 bond->dev->name,3153 &targets[i]);3154 bond_arp_send(slave, ARPOP_REQUEST, targets[i],3155 0, tags);3156 continue;3157 }3158 3159 /* bond device itself */3160 if (rt->dst.dev == bond->dev)3161 goto found;3162 3163 rcu_read_lock();3164 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);3165 rcu_read_unlock();3166 3167 if (!IS_ERR_OR_NULL(tags))3168 goto found;3169 3170 /* Not our device - skip */3171 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",3172 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");3173 3174 ip_rt_put(rt);3175 continue;3176 3177found:3178 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);3179 ip_rt_put(rt);3180 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);3181 kfree(tags);3182 }3183}3184 3185static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)3186{3187 int i;3188 3189 if (!sip || !bond_has_this_ip(bond, tip)) {3190 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",3191 __func__, &sip, &tip);3192 return;3193 }3194 3195 i = bond_get_targets_ip(bond->params.arp_targets, sip);3196 if (i == -1) {3197 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",3198 __func__, &sip);3199 return;3200 }3201 slave->last_rx = jiffies;3202 slave->target_last_arp_rx[i] = jiffies;3203}3204 3205static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,3206 struct slave *slave)3207{3208 struct arphdr *arp = (struct arphdr *)skb->data;3209 struct slave *curr_active_slave, *curr_arp_slave;3210 unsigned char *arp_ptr;3211 __be32 sip, tip;3212 unsigned int alen;3213 3214 alen = arp_hdr_len(bond->dev);3215 3216 if (alen > skb_headlen(skb)) {3217 arp = kmalloc(alen, GFP_ATOMIC);3218 if (!arp)3219 goto out_unlock;3220 if (skb_copy_bits(skb, 0, arp, alen) < 0)3221 goto out_unlock;3222 }3223 3224 if (arp->ar_hln != bond->dev->addr_len ||3225 skb->pkt_type == PACKET_OTHERHOST ||3226 skb->pkt_type == PACKET_LOOPBACK ||3227 arp->ar_hrd != htons(ARPHRD_ETHER) ||3228 arp->ar_pro != htons(ETH_P_IP) ||3229 arp->ar_pln != 4)3230 goto out_unlock;3231 3232 arp_ptr = (unsigned char *)(arp + 1);3233 arp_ptr += bond->dev->addr_len;3234 memcpy(&sip, arp_ptr, 4);3235 arp_ptr += 4 + bond->dev->addr_len;3236 memcpy(&tip, arp_ptr, 4);3237 3238 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",3239 __func__, slave->dev->name, bond_slave_state(slave),3240 bond->params.arp_validate, slave_do_arp_validate(bond, slave),3241 &sip, &tip);3242 3243 curr_active_slave = rcu_dereference(bond->curr_active_slave);3244 curr_arp_slave = rcu_dereference(bond->current_arp_slave);3245 3246 /* We 'trust' the received ARP enough to validate it if:3247 *3248 * (a) the slave receiving the ARP is active (which includes the3249 * current ARP slave, if any), or3250 *3251 * (b) the receiving slave isn't active, but there is a currently3252 * active slave and it received valid arp reply(s) after it became3253 * the currently active slave, or3254 *3255 * (c) there is an ARP slave that sent an ARP during the prior ARP3256 * interval, and we receive an ARP reply on any slave. We accept3257 * these because switch FDB update delays may deliver the ARP3258 * reply to a slave other than the sender of the ARP request.3259 *3260 * Note: for (b), backup slaves are receiving the broadcast ARP3261 * request, not a reply. This request passes from the sending3262 * slave through the L2 switch(es) to the receiving slave. Since3263 * this is checking the request, sip/tip are swapped for3264 * validation.3265 *3266 * This is done to avoid endless looping when we can't reach the3267 * arp_ip_target and fool ourselves with our own arp requests.3268 */3269 if (bond_is_active_slave(slave))3270 bond_validate_arp(bond, slave, sip, tip);3271 else if (curr_active_slave &&3272 time_after(slave_last_rx(bond, curr_active_slave),3273 curr_active_slave->last_link_up))3274 bond_validate_arp(bond, slave, tip, sip);3275 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&3276 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))3277 bond_validate_arp(bond, slave, sip, tip);3278 3279out_unlock:3280 if (arp != (struct arphdr *)skb->data)3281 kfree(arp);3282 return RX_HANDLER_ANOTHER;3283}3284 3285#if IS_ENABLED(CONFIG_IPV6)3286static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr,3287 const struct in6_addr *saddr, struct bond_vlan_tag *tags)3288{3289 struct net_device *bond_dev = slave->bond->dev;3290 struct net_device *slave_dev = slave->dev;3291 struct in6_addr mcaddr;3292 struct sk_buff *skb;3293 3294 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n",3295 daddr, saddr);3296 3297 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0);3298 if (!skb) {3299 net_err_ratelimited("NS packet allocation failed\n");3300 return;3301 }3302 3303 addrconf_addr_solict_mult(daddr, &mcaddr);3304 if (bond_handle_vlan(slave, tags, skb)) {3305 slave_update_last_tx(slave);3306 ndisc_send_skb(skb, &mcaddr, saddr);3307 }3308}3309 3310static void bond_ns_send_all(struct bonding *bond, struct slave *slave)3311{3312 struct in6_addr *targets = bond->params.ns_targets;3313 struct bond_vlan_tag *tags;3314 struct dst_entry *dst;3315 struct in6_addr saddr;3316 struct flowi6 fl6;3317 int i;3318 3319 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) {3320 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n",3321 __func__, &targets[i]);3322 tags = NULL;3323 3324 /* Find out through which dev should the packet go */3325 memset(&fl6, 0, sizeof(struct flowi6));3326 fl6.daddr = targets[i];3327 fl6.flowi6_oif = bond->dev->ifindex;3328 3329 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);3330 if (dst->error) {3331 dst_release(dst);3332 /* there's no route to target - try to send arp3333 * probe to generate any traffic (arp_validate=0)3334 */3335 if (bond->params.arp_validate)3336 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n",3337 bond->dev->name,3338 &targets[i]);3339 bond_ns_send(slave, &targets[i], &in6addr_any, tags);3340 continue;3341 }3342 3343 /* bond device itself */3344 if (dst->dev == bond->dev)3345 goto found;3346 3347 rcu_read_lock();3348 tags = bond_verify_device_path(bond->dev, dst->dev, 0);3349 rcu_read_unlock();3350 3351 if (!IS_ERR_OR_NULL(tags))3352 goto found;3353 3354 /* Not our device - skip */3355 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n",3356 &targets[i], dst->dev ? dst->dev->name : "NULL");3357 3358 dst_release(dst);3359 continue;3360 3361found:3362 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr))3363 bond_ns_send(slave, &targets[i], &saddr, tags);3364 else3365 bond_ns_send(slave, &targets[i], &in6addr_any, tags);3366 3367 dst_release(dst);3368 kfree(tags);3369 }3370}3371 3372static int bond_confirm_addr6(struct net_device *dev,3373 struct netdev_nested_priv *priv)3374{3375 struct in6_addr *addr = (struct in6_addr *)priv->data;3376 3377 return ipv6_chk_addr(dev_net(dev), addr, dev, 0);3378}3379 3380static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)3381{3382 struct netdev_nested_priv priv = {3383 .data = addr,3384 };3385 int ret = false;3386 3387 if (bond_confirm_addr6(bond->dev, &priv))3388 return true;3389 3390 rcu_read_lock();3391 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv))3392 ret = true;3393 rcu_read_unlock();3394 3395 return ret;3396}3397 3398static void bond_validate_na(struct bonding *bond, struct slave *slave,3399 struct in6_addr *saddr, struct in6_addr *daddr)3400{3401 int i;3402 3403 /* Ignore NAs that:3404 * 1. Source address is unspecified address.3405 * 2. Dest address is neither all-nodes multicast address nor3406 * exist on bond interface.3407 */3408 if (ipv6_addr_any(saddr) ||3409 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&3410 !bond_has_this_ip6(bond, daddr))) {3411 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",3412 __func__, saddr, daddr);3413 return;3414 }3415 3416 i = bond_get_targets_ip6(bond->params.ns_targets, saddr);3417 if (i == -1) {3418 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n",3419 __func__, saddr);3420 return;3421 }3422 slave->last_rx = jiffies;3423 slave->target_last_arp_rx[i] = jiffies;3424}3425 3426static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,3427 struct slave *slave)3428{3429 struct slave *curr_active_slave, *curr_arp_slave;3430 struct in6_addr *saddr, *daddr;3431 struct {3432 struct ipv6hdr ip6;3433 struct icmp6hdr icmp6;3434 } *combined, _combined;3435 3436 if (skb->pkt_type == PACKET_OTHERHOST ||3437 skb->pkt_type == PACKET_LOOPBACK)3438 goto out;3439 3440 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined);3441 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP ||3442 (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION &&3443 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT))3444 goto out;3445 3446 saddr = &combined->ip6.saddr;3447 daddr = &combined->ip6.daddr;3448 3449 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",3450 __func__, slave->dev->name, bond_slave_state(slave),3451 bond->params.arp_validate, slave_do_arp_validate(bond, slave),3452 saddr, daddr);3453 3454 curr_active_slave = rcu_dereference(bond->curr_active_slave);3455 curr_arp_slave = rcu_dereference(bond->current_arp_slave);3456 3457 /* We 'trust' the received ARP enough to validate it if:3458 * see bond_arp_rcv().3459 */3460 if (bond_is_active_slave(slave))3461 bond_validate_na(bond, slave, saddr, daddr);3462 else if (curr_active_slave &&3463 time_after(slave_last_rx(bond, curr_active_slave),3464 curr_active_slave->last_link_up))3465 bond_validate_na(bond, slave, daddr, saddr);3466 else if (curr_arp_slave &&3467 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))3468 bond_validate_na(bond, slave, saddr, daddr);3469 3470out:3471 return RX_HANDLER_ANOTHER;3472}3473#endif3474 3475int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond,3476 struct slave *slave)3477{3478#if IS_ENABLED(CONFIG_IPV6)3479 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6);3480#endif3481 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);3482 3483 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",3484 __func__, skb->dev->name);3485 3486 /* Use arp validate logic for both ARP and NS */3487 if (!slave_do_arp_validate(bond, slave)) {3488 if ((slave_do_arp_validate_only(bond) && is_arp) ||3489#if IS_ENABLED(CONFIG_IPV6)3490 (slave_do_arp_validate_only(bond) && is_ipv6) ||3491#endif3492 !slave_do_arp_validate_only(bond))3493 slave->last_rx = jiffies;3494 return RX_HANDLER_ANOTHER;3495 } else if (is_arp) {3496 return bond_arp_rcv(skb, bond, slave);3497#if IS_ENABLED(CONFIG_IPV6)3498 } else if (is_ipv6) {3499 return bond_na_rcv(skb, bond, slave);3500#endif3501 } else {3502 return RX_HANDLER_ANOTHER;3503 }3504}3505 3506static void bond_send_validate(struct bonding *bond, struct slave *slave)3507{3508 bond_arp_send_all(bond, slave);3509#if IS_ENABLED(CONFIG_IPV6)3510 bond_ns_send_all(bond, slave);3511#endif3512}3513 3514/* function to verify if we're in the arp_interval timeslice, returns true if3515 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +3516 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.3517 */3518static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,3519 int mod)3520{3521 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);3522 3523 return time_in_range(jiffies,3524 last_act - delta_in_ticks,3525 last_act + mod * delta_in_ticks + delta_in_ticks/2);3526}3527 3528/* This function is called regularly to monitor each slave's link3529 * ensuring that traffic is being sent and received when arp monitoring3530 * is used in load-balancing mode. if the adapter has been dormant, then an3531 * arp is transmitted to generate traffic. see activebackup_arp_monitor for3532 * arp monitoring in active backup mode.3533 */3534static void bond_loadbalance_arp_mon(struct bonding *bond)3535{3536 struct slave *slave, *oldcurrent;3537 struct list_head *iter;3538 int do_failover = 0, slave_state_changed = 0;3539 3540 if (!bond_has_slaves(bond))3541 goto re_arm;3542 3543 rcu_read_lock();3544 3545 oldcurrent = rcu_dereference(bond->curr_active_slave);3546 /* see if any of the previous devices are up now (i.e. they have3547 * xmt and rcv traffic). the curr_active_slave does not come into3548 * the picture unless it is null. also, slave->last_link_up is not3549 * needed here because we send an arp on each slave and give a slave3550 * as long as it needs to get the tx/rx within the delta.3551 * TODO: what about up/down delay in arp mode? it wasn't here before3552 * so it can wait3553 */3554 bond_for_each_slave_rcu(bond, slave, iter) {3555 unsigned long last_tx = slave_last_tx(slave);3556 3557 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);3558 3559 if (slave->link != BOND_LINK_UP) {3560 if (bond_time_in_interval(bond, last_tx, 1) &&3561 bond_time_in_interval(bond, slave->last_rx, 1)) {3562 3563 bond_propose_link_state(slave, BOND_LINK_UP);3564 slave_state_changed = 1;3565 3566 /* primary_slave has no meaning in round-robin3567 * mode. the window of a slave being up and3568 * curr_active_slave being null after enslaving3569 * is closed.3570 */3571 if (!oldcurrent) {3572 slave_info(bond->dev, slave->dev, "link status definitely up\n");3573 do_failover = 1;3574 } else {3575 slave_info(bond->dev, slave->dev, "interface is now up\n");3576 }3577 }3578 } else {3579 /* slave->link == BOND_LINK_UP */3580 3581 /* not all switches will respond to an arp request3582 * when the source ip is 0, so don't take the link down3583 * if we don't know our ip yet3584 */3585 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||3586 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) {3587 3588 bond_propose_link_state(slave, BOND_LINK_DOWN);3589 slave_state_changed = 1;3590 3591 if (slave->link_failure_count < UINT_MAX)3592 slave->link_failure_count++;3593 3594 slave_info(bond->dev, slave->dev, "interface is now down\n");3595 3596 if (slave == oldcurrent)3597 do_failover = 1;3598 }3599 }3600 3601 /* note: if switch is in round-robin mode, all links3602 * must tx arp to ensure all links rx an arp - otherwise3603 * links may oscillate or not come up at all; if switch is3604 * in something like xor mode, there is nothing we can3605 * do - all replies will be rx'ed on same link causing slaves3606 * to be unstable during low/no traffic periods3607 */3608 if (bond_slave_is_up(slave))3609 bond_send_validate(bond, slave);3610 }3611 3612 rcu_read_unlock();3613 3614 if (do_failover || slave_state_changed) {3615 if (!rtnl_trylock())3616 goto re_arm;3617 3618 bond_for_each_slave(bond, slave, iter) {3619 if (slave->link_new_state != BOND_LINK_NOCHANGE)3620 slave->link = slave->link_new_state;3621 }3622 3623 if (slave_state_changed) {3624 bond_slave_state_change(bond);3625 if (BOND_MODE(bond) == BOND_MODE_XOR)3626 bond_update_slave_arr(bond, NULL);3627 }3628 if (do_failover) {3629 block_netpoll_tx();3630 bond_select_active_slave(bond);3631 unblock_netpoll_tx();3632 }3633 rtnl_unlock();3634 }3635 3636re_arm:3637 if (bond->params.arp_interval)3638 queue_delayed_work(bond->wq, &bond->arp_work,3639 msecs_to_jiffies(bond->params.arp_interval));3640}3641 3642/* Called to inspect slaves for active-backup mode ARP monitor link state3643 * changes. Sets proposed link state in slaves to specify what action3644 * should take place for the slave. Returns 0 if no changes are found, >03645 * if changes to link states must be committed.3646 *3647 * Called with rcu_read_lock held.3648 */3649static int bond_ab_arp_inspect(struct bonding *bond)3650{3651 unsigned long last_tx, last_rx;3652 struct list_head *iter;3653 struct slave *slave;3654 int commit = 0;3655 3656 bond_for_each_slave_rcu(bond, slave, iter) {3657 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);3658 last_rx = slave_last_rx(bond, slave);3659 3660 if (slave->link != BOND_LINK_UP) {3661 if (bond_time_in_interval(bond, last_rx, 1)) {3662 bond_propose_link_state(slave, BOND_LINK_UP);3663 commit++;3664 } else if (slave->link == BOND_LINK_BACK) {3665 bond_propose_link_state(slave, BOND_LINK_FAIL);3666 commit++;3667 }3668 continue;3669 }3670 3671 /* Give slaves 2*delta after being enslaved or made3672 * active. This avoids bouncing, as the last receive3673 * times need a full ARP monitor cycle to be updated.3674 */3675 if (bond_time_in_interval(bond, slave->last_link_up, 2))3676 continue;3677 3678 /* Backup slave is down if:3679 * - No current_arp_slave AND3680 * - more than (missed_max+1)*delta since last receive AND3681 * - the bond has an IP address3682 *3683 * Note: a non-null current_arp_slave indicates3684 * the curr_active_slave went down and we are3685 * searching for a new one; under this condition3686 * we only take the curr_active_slave down - this3687 * gives each slave a chance to tx/rx traffic3688 * before being taken out3689 */3690 if (!bond_is_active_slave(slave) &&3691 !rcu_access_pointer(bond->current_arp_slave) &&3692 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) {3693 bond_propose_link_state(slave, BOND_LINK_DOWN);3694 commit++;3695 }3696 3697 /* Active slave is down if:3698 * - more than missed_max*delta since transmitting OR3699 * - (more than missed_max*delta since receive AND3700 * the bond has an IP address)3701 */3702 last_tx = slave_last_tx(slave);3703 if (bond_is_active_slave(slave) &&3704 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||3705 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) {3706 bond_propose_link_state(slave, BOND_LINK_DOWN);3707 commit++;3708 }3709 }3710 3711 return commit;3712}3713 3714/* Called to commit link state changes noted by inspection step of3715 * active-backup mode ARP monitor.3716 *3717 * Called with RTNL hold.3718 */3719static void bond_ab_arp_commit(struct bonding *bond)3720{3721 bool do_failover = false;3722 struct list_head *iter;3723 unsigned long last_tx;3724 struct slave *slave;3725 3726 bond_for_each_slave(bond, slave, iter) {3727 switch (slave->link_new_state) {3728 case BOND_LINK_NOCHANGE:3729 continue;3730 3731 case BOND_LINK_UP:3732 last_tx = slave_last_tx(slave);3733 if (rtnl_dereference(bond->curr_active_slave) != slave ||3734 (!rtnl_dereference(bond->curr_active_slave) &&3735 bond_time_in_interval(bond, last_tx, 1))) {3736 struct slave *current_arp_slave;3737 3738 current_arp_slave = rtnl_dereference(bond->current_arp_slave);3739 bond_set_slave_link_state(slave, BOND_LINK_UP,3740 BOND_SLAVE_NOTIFY_NOW);3741 if (current_arp_slave) {3742 bond_set_slave_inactive_flags(3743 current_arp_slave,3744 BOND_SLAVE_NOTIFY_NOW);3745 RCU_INIT_POINTER(bond->current_arp_slave, NULL);3746 }3747 3748 slave_info(bond->dev, slave->dev, "link status definitely up\n");3749 3750 if (!rtnl_dereference(bond->curr_active_slave) ||3751 slave == rtnl_dereference(bond->primary_slave) ||3752 slave->prio > rtnl_dereference(bond->curr_active_slave)->prio)3753 do_failover = true;3754 3755 }3756 3757 continue;3758 3759 case BOND_LINK_DOWN:3760 if (slave->link_failure_count < UINT_MAX)3761 slave->link_failure_count++;3762 3763 bond_set_slave_link_state(slave, BOND_LINK_DOWN,3764 BOND_SLAVE_NOTIFY_NOW);3765 bond_set_slave_inactive_flags(slave,3766 BOND_SLAVE_NOTIFY_NOW);3767 3768 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");3769 3770 if (slave == rtnl_dereference(bond->curr_active_slave)) {3771 RCU_INIT_POINTER(bond->current_arp_slave, NULL);3772 do_failover = true;3773 }3774 3775 continue;3776 3777 case BOND_LINK_FAIL:3778 bond_set_slave_link_state(slave, BOND_LINK_FAIL,3779 BOND_SLAVE_NOTIFY_NOW);3780 bond_set_slave_inactive_flags(slave,3781 BOND_SLAVE_NOTIFY_NOW);3782 3783 /* A slave has just been enslaved and has become3784 * the current active slave.3785 */3786 if (rtnl_dereference(bond->curr_active_slave))3787 RCU_INIT_POINTER(bond->current_arp_slave, NULL);3788 continue;3789 3790 default:3791 slave_err(bond->dev, slave->dev,3792 "impossible: link_new_state %d on slave\n",3793 slave->link_new_state);3794 continue;3795 }3796 }3797 3798 if (do_failover) {3799 block_netpoll_tx();3800 bond_select_active_slave(bond);3801 unblock_netpoll_tx();3802 }3803 3804 bond_set_carrier(bond);3805}3806 3807/* Send ARP probes for active-backup mode ARP monitor.3808 *3809 * Called with rcu_read_lock held.3810 */3811static bool bond_ab_arp_probe(struct bonding *bond)3812{3813 struct slave *slave, *before = NULL, *new_slave = NULL,3814 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),3815 *curr_active_slave = rcu_dereference(bond->curr_active_slave);3816 struct list_head *iter;3817 bool found = false;3818 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;3819 3820 if (curr_arp_slave && curr_active_slave)3821 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",3822 curr_arp_slave->dev->name,3823 curr_active_slave->dev->name);3824 3825 if (curr_active_slave) {3826 bond_send_validate(bond, curr_active_slave);3827 return should_notify_rtnl;3828 }3829 3830 /* if we don't have a curr_active_slave, search for the next available3831 * backup slave from the current_arp_slave and make it the candidate3832 * for becoming the curr_active_slave3833 */3834 3835 if (!curr_arp_slave) {3836 curr_arp_slave = bond_first_slave_rcu(bond);3837 if (!curr_arp_slave)3838 return should_notify_rtnl;3839 }3840 3841 bond_for_each_slave_rcu(bond, slave, iter) {3842 if (!found && !before && bond_slave_is_up(slave))3843 before = slave;3844 3845 if (found && !new_slave && bond_slave_is_up(slave))3846 new_slave = slave;3847 /* if the link state is up at this point, we3848 * mark it down - this can happen if we have3849 * simultaneous link failures and3850 * reselect_active_interface doesn't make this3851 * one the current slave so it is still marked3852 * up when it is actually down3853 */3854 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {3855 bond_set_slave_link_state(slave, BOND_LINK_DOWN,3856 BOND_SLAVE_NOTIFY_LATER);3857 if (slave->link_failure_count < UINT_MAX)3858 slave->link_failure_count++;3859 3860 bond_set_slave_inactive_flags(slave,3861 BOND_SLAVE_NOTIFY_LATER);3862 3863 slave_info(bond->dev, slave->dev, "backup interface is now down\n");3864 }3865 if (slave == curr_arp_slave)3866 found = true;3867 }3868 3869 if (!new_slave && before)3870 new_slave = before;3871 3872 if (!new_slave)3873 goto check_state;3874 3875 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,3876 BOND_SLAVE_NOTIFY_LATER);3877 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);3878 bond_send_validate(bond, new_slave);3879 new_slave->last_link_up = jiffies;3880 rcu_assign_pointer(bond->current_arp_slave, new_slave);3881 3882check_state:3883 bond_for_each_slave_rcu(bond, slave, iter) {3884 if (slave->should_notify || slave->should_notify_link) {3885 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;3886 break;3887 }3888 }3889 return should_notify_rtnl;3890}3891 3892static void bond_activebackup_arp_mon(struct bonding *bond)3893{3894 bool should_notify_peers = false;3895 bool should_notify_rtnl = false;3896 int delta_in_ticks;3897 3898 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);3899 3900 if (!bond_has_slaves(bond))3901 goto re_arm;3902 3903 rcu_read_lock();3904 3905 should_notify_peers = bond_should_notify_peers(bond);3906 3907 if (bond_ab_arp_inspect(bond)) {3908 rcu_read_unlock();3909 3910 /* Race avoidance with bond_close flush of workqueue */3911 if (!rtnl_trylock()) {3912 delta_in_ticks = 1;3913 should_notify_peers = false;3914 goto re_arm;3915 }3916 3917 bond_ab_arp_commit(bond);3918 3919 rtnl_unlock();3920 rcu_read_lock();3921 }3922 3923 should_notify_rtnl = bond_ab_arp_probe(bond);3924 rcu_read_unlock();3925 3926re_arm:3927 if (bond->params.arp_interval)3928 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);3929 3930 if (should_notify_peers || should_notify_rtnl) {3931 if (!rtnl_trylock())3932 return;3933 3934 if (should_notify_peers) {3935 bond->send_peer_notif--;3936 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,3937 bond->dev);3938 }3939 if (should_notify_rtnl) {3940 bond_slave_state_notify(bond);3941 bond_slave_link_notify(bond);3942 }3943 3944 rtnl_unlock();3945 }3946}3947 3948static void bond_arp_monitor(struct work_struct *work)3949{3950 struct bonding *bond = container_of(work, struct bonding,3951 arp_work.work);3952 3953 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)3954 bond_activebackup_arp_mon(bond);3955 else3956 bond_loadbalance_arp_mon(bond);3957}3958 3959/*-------------------------- netdev event handling --------------------------*/3960 3961/* Change device name */3962static int bond_event_changename(struct bonding *bond)3963{3964 bond_remove_proc_entry(bond);3965 bond_create_proc_entry(bond);3966 3967 bond_debug_reregister(bond);3968 3969 return NOTIFY_DONE;3970}3971 3972static int bond_master_netdev_event(unsigned long event,3973 struct net_device *bond_dev)3974{3975 struct bonding *event_bond = netdev_priv(bond_dev);3976 3977 netdev_dbg(bond_dev, "%s called\n", __func__);3978 3979 switch (event) {3980 case NETDEV_CHANGENAME:3981 return bond_event_changename(event_bond);3982 case NETDEV_UNREGISTER:3983 bond_remove_proc_entry(event_bond);3984#ifdef CONFIG_XFRM_OFFLOAD3985 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);3986#endif /* CONFIG_XFRM_OFFLOAD */3987 break;3988 case NETDEV_REGISTER:3989 bond_create_proc_entry(event_bond);3990 break;3991 default:3992 break;3993 }3994 3995 return NOTIFY_DONE;3996}3997 3998static int bond_slave_netdev_event(unsigned long event,3999 struct net_device *slave_dev)4000{4001 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;4002 struct bonding *bond;4003 struct net_device *bond_dev;4004 4005 /* A netdev event can be generated while enslaving a device4006 * before netdev_rx_handler_register is called in which case4007 * slave will be NULL4008 */4009 if (!slave) {4010 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);4011 return NOTIFY_DONE;4012 }4013 4014 bond_dev = slave->bond->dev;4015 bond = slave->bond;4016 primary = rtnl_dereference(bond->primary_slave);4017 4018 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);4019 4020 switch (event) {4021 case NETDEV_UNREGISTER:4022 if (bond_dev->type != ARPHRD_ETHER)4023 bond_release_and_destroy(bond_dev, slave_dev);4024 else4025 __bond_release_one(bond_dev, slave_dev, false, true);4026 break;4027 case NETDEV_UP:4028 case NETDEV_CHANGE:4029 /* For 802.3ad mode only:4030 * Getting invalid Speed/Duplex values here will put slave4031 * in weird state. Mark it as link-fail if the link was4032 * previously up or link-down if it hasn't yet come up, and4033 * let link-monitoring (miimon) set it right when correct4034 * speeds/duplex are available.4035 */4036 if (bond_update_speed_duplex(slave) &&4037 BOND_MODE(bond) == BOND_MODE_8023AD) {4038 if (slave->last_link_up)4039 slave->link = BOND_LINK_FAIL;4040 else4041 slave->link = BOND_LINK_DOWN;4042 }4043 4044 if (BOND_MODE(bond) == BOND_MODE_8023AD)4045 bond_3ad_adapter_speed_duplex_changed(slave);4046 fallthrough;4047 case NETDEV_DOWN:4048 /* Refresh slave-array if applicable!4049 * If the setup does not use miimon or arpmon (mode-specific!),4050 * then these events will not cause the slave-array to be4051 * refreshed. This will cause xmit to use a slave that is not4052 * usable. Avoid such situation by refeshing the array at these4053 * events. If these (miimon/arpmon) parameters are configured4054 * then array gets refreshed twice and that should be fine!4055 */4056 if (bond_mode_can_use_xmit_hash(bond))4057 bond_update_slave_arr(bond, NULL);4058 break;4059 case NETDEV_CHANGEMTU:4060 /* TODO: Should slaves be allowed to4061 * independently alter their MTU? For4062 * an active-backup bond, slaves need4063 * not be the same type of device, so4064 * MTUs may vary. For other modes,4065 * slaves arguably should have the4066 * same MTUs. To do this, we'd need to4067 * take over the slave's change_mtu4068 * function for the duration of their4069 * servitude.4070 */4071 break;4072 case NETDEV_CHANGENAME:4073 /* we don't care if we don't have primary set */4074 if (!bond_uses_primary(bond) ||4075 !bond->params.primary[0])4076 break;4077 4078 if (slave == primary) {4079 /* slave's name changed - he's no longer primary */4080 RCU_INIT_POINTER(bond->primary_slave, NULL);4081 } else if (!strcmp(slave_dev->name, bond->params.primary)) {4082 /* we have a new primary slave */4083 rcu_assign_pointer(bond->primary_slave, slave);4084 } else { /* we didn't change primary - exit */4085 break;4086 }4087 4088 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",4089 primary ? slave_dev->name : "none");4090 4091 block_netpoll_tx();4092 bond_select_active_slave(bond);4093 unblock_netpoll_tx();4094 break;4095 case NETDEV_FEAT_CHANGE:4096 if (!bond->notifier_ctx) {4097 bond->notifier_ctx = true;4098 bond_compute_features(bond);4099 bond->notifier_ctx = false;4100 }4101 break;4102 case NETDEV_RESEND_IGMP:4103 /* Propagate to master device */4104 call_netdevice_notifiers(event, slave->bond->dev);4105 break;4106 case NETDEV_XDP_FEAT_CHANGE:4107 bond_xdp_set_features(bond_dev);4108 break;4109 default:4110 break;4111 }4112 4113 return NOTIFY_DONE;4114}4115 4116/* bond_netdev_event: handle netdev notifier chain events.4117 *4118 * This function receives events for the netdev chain. The caller (an4119 * ioctl handler calling blocking_notifier_call_chain) holds the necessary4120 * locks for us to safely manipulate the slave devices (RTNL lock,4121 * dev_probe_lock).4122 */4123static int bond_netdev_event(struct notifier_block *this,4124 unsigned long event, void *ptr)4125{4126 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);4127 4128 netdev_dbg(event_dev, "%s received %s\n",4129 __func__, netdev_cmd_to_name(event));4130 4131 if (!(event_dev->priv_flags & IFF_BONDING))4132 return NOTIFY_DONE;4133 4134 if (event_dev->flags & IFF_MASTER) {4135 int ret;4136 4137 ret = bond_master_netdev_event(event, event_dev);4138 if (ret != NOTIFY_DONE)4139 return ret;4140 }4141 4142 if (event_dev->flags & IFF_SLAVE)4143 return bond_slave_netdev_event(event, event_dev);4144 4145 return NOTIFY_DONE;4146}4147 4148static struct notifier_block bond_netdev_notifier = {4149 .notifier_call = bond_netdev_event,4150};4151 4152/*---------------------------- Hashing Policies -----------------------------*/4153 4154/* Helper to access data in a packet, with or without a backing skb.4155 * If skb is given the data is linearized if necessary via pskb_may_pull.4156 */4157static inline const void *bond_pull_data(struct sk_buff *skb,4158 const void *data, int hlen, int n)4159{4160 if (likely(n <= hlen))4161 return data;4162 else if (skb && likely(pskb_may_pull(skb, n)))4163 return skb->data;4164 4165 return NULL;4166}4167 4168/* L2 hash helper */4169static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)4170{4171 struct ethhdr *ep;4172 4173 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));4174 if (!data)4175 return 0;4176 4177 ep = (struct ethhdr *)(data + mhoff);4178 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto);4179}4180 4181static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data,4182 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34)4183{4184 const struct ipv6hdr *iph6;4185 const struct iphdr *iph;4186 4187 if (l2_proto == htons(ETH_P_IP)) {4188 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph));4189 if (!data)4190 return false;4191 4192 iph = (const struct iphdr *)(data + *nhoff);4193 iph_to_flow_copy_v4addrs(fk, iph);4194 *nhoff += iph->ihl << 2;4195 if (!ip_is_fragment(iph))4196 *ip_proto = iph->protocol;4197 } else if (l2_proto == htons(ETH_P_IPV6)) {4198 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6));4199 if (!data)4200 return false;4201 4202 iph6 = (const struct ipv6hdr *)(data + *nhoff);4203 iph_to_flow_copy_v6addrs(fk, iph6);4204 *nhoff += sizeof(*iph6);4205 *ip_proto = iph6->nexthdr;4206 } else {4207 return false;4208 }4209 4210 if (l34 && *ip_proto >= 0)4211 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen);4212 4213 return true;4214}4215 4216static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)4217{4218 u32 srcmac_vendor = 0, srcmac_dev = 0;4219 struct ethhdr *mac_hdr;4220 u16 vlan = 0;4221 int i;4222 4223 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));4224 if (!data)4225 return 0;4226 mac_hdr = (struct ethhdr *)(data + mhoff);4227 4228 for (i = 0; i < 3; i++)4229 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];4230 4231 for (i = 3; i < ETH_ALEN; i++)4232 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];4233 4234 if (skb && skb_vlan_tag_present(skb))4235 vlan = skb_vlan_tag_get(skb);4236 4237 return vlan ^ srcmac_vendor ^ srcmac_dev;4238}4239 4240/* Extract the appropriate headers based on bond's xmit policy */4241static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data,4242 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk)4243{4244 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;4245 int ip_proto = -1;4246 4247 switch (bond->params.xmit_policy) {4248 case BOND_XMIT_POLICY_ENCAP23:4249 case BOND_XMIT_POLICY_ENCAP34:4250 memset(fk, 0, sizeof(*fk));4251 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,4252 fk, data, l2_proto, nhoff, hlen, 0);4253 default:4254 break;4255 }4256 4257 fk->ports.ports = 0;4258 memset(&fk->icmp, 0, sizeof(fk->icmp));4259 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34))4260 return false;4261 4262 /* ICMP error packets contains at least 8 bytes of the header4263 * of the packet which generated the error. Use this information4264 * to correlate ICMP error packets within the same flow which4265 * generated the error.4266 */4267 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) {4268 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen);4269 if (ip_proto == IPPROTO_ICMP) {4270 if (!icmp_is_err(fk->icmp.type))4271 return true;4272 4273 nhoff += sizeof(struct icmphdr);4274 } else if (ip_proto == IPPROTO_ICMPV6) {4275 if (!icmpv6_is_err(fk->icmp.type))4276 return true;4277 4278 nhoff += sizeof(struct icmp6hdr);4279 }4280 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34);4281 }4282 4283 return true;4284}4285 4286static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy)4287{4288 hash ^= (__force u32)flow_get_u32_dst(flow) ^4289 (__force u32)flow_get_u32_src(flow);4290 hash ^= (hash >> 16);4291 hash ^= (hash >> 8);4292 4293 /* discard lowest hash bit to deal with the common even ports pattern */4294 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 ||4295 xmit_policy == BOND_XMIT_POLICY_ENCAP34)4296 return hash >> 1;4297 4298 return hash;4299}4300 4301/* Generate hash based on xmit policy. If @skb is given it is used to linearize4302 * the data as required, but this function can be used without it if the data is4303 * known to be linear (e.g. with xdp_buff).4304 */4305static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data,4306 __be16 l2_proto, int mhoff, int nhoff, int hlen)4307{4308 struct flow_keys flow;4309 u32 hash;4310 4311 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)4312 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen);4313 4314 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||4315 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow))4316 return bond_eth_hash(skb, data, mhoff, hlen);4317 4318 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||4319 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {4320 hash = bond_eth_hash(skb, data, mhoff, hlen);4321 } else {4322 if (flow.icmp.id)4323 memcpy(&hash, &flow.icmp, sizeof(hash));4324 else4325 memcpy(&hash, &flow.ports.ports, sizeof(hash));4326 }4327 4328 return bond_ip_hash(hash, &flow, bond->params.xmit_policy);4329}4330 4331/**4332 * bond_xmit_hash - generate a hash value based on the xmit policy4333 * @bond: bonding device4334 * @skb: buffer to use for headers4335 *4336 * This function will extract the necessary headers from the skb buffer and use4337 * them to generate a hash based on the xmit_policy set in the bonding device4338 */4339u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)4340{4341 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&4342 skb->l4_hash)4343 return skb->hash;4344 4345 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,4346 0, skb_network_offset(skb),4347 skb_headlen(skb));4348}4349 4350/**4351 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy4352 * @bond: bonding device4353 * @xdp: buffer to use for headers4354 *4355 * The XDP variant of bond_xmit_hash.4356 */4357static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp)4358{4359 struct ethhdr *eth;4360 4361 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end)4362 return 0;4363 4364 eth = (struct ethhdr *)xdp->data;4365 4366 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0,4367 sizeof(struct ethhdr), xdp->data_end - xdp->data);4368}4369 4370/*-------------------------- Device entry points ----------------------------*/4371 4372void bond_work_init_all(struct bonding *bond)4373{4374 INIT_DELAYED_WORK(&bond->mcast_work,4375 bond_resend_igmp_join_requests_delayed);4376 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);4377 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);4378 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);4379 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);4380 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);4381}4382 4383static void bond_work_cancel_all(struct bonding *bond)4384{4385 cancel_delayed_work_sync(&bond->mii_work);4386 cancel_delayed_work_sync(&bond->arp_work);4387 cancel_delayed_work_sync(&bond->alb_work);4388 cancel_delayed_work_sync(&bond->ad_work);4389 cancel_delayed_work_sync(&bond->mcast_work);4390 cancel_delayed_work_sync(&bond->slave_arr_work);4391}4392 4393static int bond_open(struct net_device *bond_dev)4394{4395 struct bonding *bond = netdev_priv(bond_dev);4396 struct list_head *iter;4397 struct slave *slave;4398 4399 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) {4400 bond->rr_tx_counter = alloc_percpu(u32);4401 if (!bond->rr_tx_counter)4402 return -ENOMEM;4403 }4404 4405 /* reset slave->backup and slave->inactive */4406 if (bond_has_slaves(bond)) {4407 bond_for_each_slave(bond, slave, iter) {4408 if (bond_uses_primary(bond) &&4409 slave != rcu_access_pointer(bond->curr_active_slave)) {4410 bond_set_slave_inactive_flags(slave,4411 BOND_SLAVE_NOTIFY_NOW);4412 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {4413 bond_set_slave_active_flags(slave,4414 BOND_SLAVE_NOTIFY_NOW);4415 }4416 }4417 }4418 4419 if (bond_is_lb(bond)) {4420 /* bond_alb_initialize must be called before the timer4421 * is started.4422 */4423 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))4424 return -ENOMEM;4425 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)4426 queue_delayed_work(bond->wq, &bond->alb_work, 0);4427 }4428 4429 if (bond->params.miimon) /* link check interval, in milliseconds. */4430 queue_delayed_work(bond->wq, &bond->mii_work, 0);4431 4432 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */4433 queue_delayed_work(bond->wq, &bond->arp_work, 0);4434 bond->recv_probe = bond_rcv_validate;4435 }4436 4437 if (BOND_MODE(bond) == BOND_MODE_8023AD) {4438 queue_delayed_work(bond->wq, &bond->ad_work, 0);4439 /* register to receive LACPDUs */4440 bond->recv_probe = bond_3ad_lacpdu_recv;4441 bond_3ad_initiate_agg_selection(bond, 1);4442 4443 bond_for_each_slave(bond, slave, iter)4444 dev_mc_add(slave->dev, lacpdu_mcast_addr);4445 }4446 4447 if (bond_mode_can_use_xmit_hash(bond))4448 bond_update_slave_arr(bond, NULL);4449 4450 return 0;4451}4452 4453static int bond_close(struct net_device *bond_dev)4454{4455 struct bonding *bond = netdev_priv(bond_dev);4456 struct slave *slave;4457 4458 bond_work_cancel_all(bond);4459 bond->send_peer_notif = 0;4460 if (bond_is_lb(bond))4461 bond_alb_deinitialize(bond);4462 bond->recv_probe = NULL;4463 4464 if (bond_uses_primary(bond)) {4465 rcu_read_lock();4466 slave = rcu_dereference(bond->curr_active_slave);4467 if (slave)4468 bond_hw_addr_flush(bond_dev, slave->dev);4469 rcu_read_unlock();4470 } else {4471 struct list_head *iter;4472 4473 bond_for_each_slave(bond, slave, iter)4474 bond_hw_addr_flush(bond_dev, slave->dev);4475 }4476 4477 return 0;4478}4479 4480/* fold stats, assuming all rtnl_link_stats64 fields are u64, but4481 * that some drivers can provide 32bit values only.4482 */4483static void bond_fold_stats(struct rtnl_link_stats64 *_res,4484 const struct rtnl_link_stats64 *_new,4485 const struct rtnl_link_stats64 *_old)4486{4487 const u64 *new = (const u64 *)_new;4488 const u64 *old = (const u64 *)_old;4489 u64 *res = (u64 *)_res;4490 int i;4491 4492 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {4493 u64 nv = new[i];4494 u64 ov = old[i];4495 s64 delta = nv - ov;4496 4497 /* detects if this particular field is 32bit only */4498 if (((nv | ov) >> 32) == 0)4499 delta = (s64)(s32)((u32)nv - (u32)ov);4500 4501 /* filter anomalies, some drivers reset their stats4502 * at down/up events.4503 */4504 if (delta > 0)4505 res[i] += delta;4506 }4507}4508 4509#ifdef CONFIG_LOCKDEP4510static int bond_get_lowest_level_rcu(struct net_device *dev)4511{4512 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];4513 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];4514 int cur = 0, max = 0;4515 4516 now = dev;4517 iter = &dev->adj_list.lower;4518 4519 while (1) {4520 next = NULL;4521 while (1) {4522 ldev = netdev_next_lower_dev_rcu(now, &iter);4523 if (!ldev)4524 break;4525 4526 next = ldev;4527 niter = &ldev->adj_list.lower;4528 dev_stack[cur] = now;4529 iter_stack[cur++] = iter;4530 if (max <= cur)4531 max = cur;4532 break;4533 }4534 4535 if (!next) {4536 if (!cur)4537 return max;4538 next = dev_stack[--cur];4539 niter = iter_stack[cur];4540 }4541 4542 now = next;4543 iter = niter;4544 }4545 4546 return max;4547}4548#endif4549 4550static void bond_get_stats(struct net_device *bond_dev,4551 struct rtnl_link_stats64 *stats)4552{4553 struct bonding *bond = netdev_priv(bond_dev);4554 struct rtnl_link_stats64 temp;4555 struct list_head *iter;4556 struct slave *slave;4557 int nest_level = 0;4558 4559 4560 rcu_read_lock();4561#ifdef CONFIG_LOCKDEP4562 nest_level = bond_get_lowest_level_rcu(bond_dev);4563#endif4564 4565 spin_lock_nested(&bond->stats_lock, nest_level);4566 memcpy(stats, &bond->bond_stats, sizeof(*stats));4567 4568 bond_for_each_slave_rcu(bond, slave, iter) {4569 const struct rtnl_link_stats64 *new =4570 dev_get_stats(slave->dev, &temp);4571 4572 bond_fold_stats(stats, new, &slave->slave_stats);4573 4574 /* save off the slave stats for the next run */4575 memcpy(&slave->slave_stats, new, sizeof(*new));4576 }4577 4578 memcpy(&bond->bond_stats, stats, sizeof(*stats));4579 spin_unlock(&bond->stats_lock);4580 rcu_read_unlock();4581}4582 4583static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)4584{4585 struct bonding *bond = netdev_priv(bond_dev);4586 struct mii_ioctl_data *mii = NULL;4587 4588 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd);4589 4590 switch (cmd) {4591 case SIOCGMIIPHY:4592 mii = if_mii(ifr);4593 if (!mii)4594 return -EINVAL;4595 4596 mii->phy_id = 0;4597 fallthrough;4598 case SIOCGMIIREG:4599 /* We do this again just in case we were called by SIOCGMIIREG4600 * instead of SIOCGMIIPHY.4601 */4602 mii = if_mii(ifr);4603 if (!mii)4604 return -EINVAL;4605 4606 if (mii->reg_num == 1) {4607 mii->val_out = 0;4608 if (netif_carrier_ok(bond->dev))4609 mii->val_out = BMSR_LSTATUS;4610 }4611 4612 break;4613 default:4614 return -EOPNOTSUPP;4615 }4616 4617 return 0;4618}4619 4620static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)4621{4622 struct bonding *bond = netdev_priv(bond_dev);4623 struct net_device *slave_dev = NULL;4624 struct ifbond k_binfo;4625 struct ifbond __user *u_binfo = NULL;4626 struct ifslave k_sinfo;4627 struct ifslave __user *u_sinfo = NULL;4628 struct bond_opt_value newval;4629 struct net *net;4630 int res = 0;4631 4632 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);4633 4634 switch (cmd) {4635 case SIOCBONDINFOQUERY:4636 u_binfo = (struct ifbond __user *)ifr->ifr_data;4637 4638 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))4639 return -EFAULT;4640 4641 bond_info_query(bond_dev, &k_binfo);4642 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))4643 return -EFAULT;4644 4645 return 0;4646 case SIOCBONDSLAVEINFOQUERY:4647 u_sinfo = (struct ifslave __user *)ifr->ifr_data;4648 4649 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))4650 return -EFAULT;4651 4652 res = bond_slave_info_query(bond_dev, &k_sinfo);4653 if (res == 0 &&4654 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))4655 return -EFAULT;4656 4657 return res;4658 default:4659 break;4660 }4661 4662 net = dev_net(bond_dev);4663 4664 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))4665 return -EPERM;4666 4667 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);4668 4669 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);4670 4671 if (!slave_dev)4672 return -ENODEV;4673 4674 switch (cmd) {4675 case SIOCBONDENSLAVE:4676 res = bond_enslave(bond_dev, slave_dev, NULL);4677 break;4678 case SIOCBONDRELEASE:4679 res = bond_release(bond_dev, slave_dev);4680 break;4681 case SIOCBONDSETHWADDR:4682 res = bond_set_dev_addr(bond_dev, slave_dev);4683 break;4684 case SIOCBONDCHANGEACTIVE:4685 bond_opt_initstr(&newval, slave_dev->name);4686 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,4687 &newval);4688 break;4689 default:4690 res = -EOPNOTSUPP;4691 }4692 4693 return res;4694}4695 4696static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr,4697 void __user *data, int cmd)4698{4699 struct ifreq ifrdata = { .ifr_data = data };4700 4701 switch (cmd) {4702 case BOND_INFO_QUERY_OLD:4703 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY);4704 case BOND_SLAVE_INFO_QUERY_OLD:4705 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY);4706 case BOND_ENSLAVE_OLD:4707 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE);4708 case BOND_RELEASE_OLD:4709 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE);4710 case BOND_SETHWADDR_OLD:4711 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR);4712 case BOND_CHANGE_ACTIVE_OLD:4713 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE);4714 }4715 4716 return -EOPNOTSUPP;4717}4718 4719static void bond_change_rx_flags(struct net_device *bond_dev, int change)4720{4721 struct bonding *bond = netdev_priv(bond_dev);4722 4723 if (change & IFF_PROMISC)4724 bond_set_promiscuity(bond,4725 bond_dev->flags & IFF_PROMISC ? 1 : -1);4726 4727 if (change & IFF_ALLMULTI)4728 bond_set_allmulti(bond,4729 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);4730}4731 4732static void bond_set_rx_mode(struct net_device *bond_dev)4733{4734 struct bonding *bond = netdev_priv(bond_dev);4735 struct list_head *iter;4736 struct slave *slave;4737 4738 rcu_read_lock();4739 if (bond_uses_primary(bond)) {4740 slave = rcu_dereference(bond->curr_active_slave);4741 if (slave) {4742 dev_uc_sync(slave->dev, bond_dev);4743 dev_mc_sync(slave->dev, bond_dev);4744 }4745 } else {4746 bond_for_each_slave_rcu(bond, slave, iter) {4747 dev_uc_sync_multiple(slave->dev, bond_dev);4748 dev_mc_sync_multiple(slave->dev, bond_dev);4749 }4750 }4751 rcu_read_unlock();4752}4753 4754static int bond_neigh_init(struct neighbour *n)4755{4756 struct bonding *bond = netdev_priv(n->dev);4757 const struct net_device_ops *slave_ops;4758 struct neigh_parms parms;4759 struct slave *slave;4760 int ret = 0;4761 4762 rcu_read_lock();4763 slave = bond_first_slave_rcu(bond);4764 if (!slave)4765 goto out;4766 slave_ops = slave->dev->netdev_ops;4767 if (!slave_ops->ndo_neigh_setup)4768 goto out;4769 4770 /* TODO: find another way [1] to implement this.4771 * Passing a zeroed structure is fragile,4772 * but at least we do not pass garbage.4773 *4774 * [1] One way would be that ndo_neigh_setup() never touch4775 * struct neigh_parms, but propagate the new neigh_setup()4776 * back to ___neigh_create() / neigh_parms_alloc()4777 */4778 memset(&parms, 0, sizeof(parms));4779 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);4780 4781 if (ret)4782 goto out;4783 4784 if (parms.neigh_setup)4785 ret = parms.neigh_setup(n);4786out:4787 rcu_read_unlock();4788 return ret;4789}4790 4791/* The bonding ndo_neigh_setup is called at init time beofre any4792 * slave exists. So we must declare proxy setup function which will4793 * be used at run time to resolve the actual slave neigh param setup.4794 *4795 * It's also called by master devices (such as vlans) to setup their4796 * underlying devices. In that case - do nothing, we're already set up from4797 * our init.4798 */4799static int bond_neigh_setup(struct net_device *dev,4800 struct neigh_parms *parms)4801{4802 /* modify only our neigh_parms */4803 if (parms->dev == dev)4804 parms->neigh_setup = bond_neigh_init;4805 4806 return 0;4807}4808 4809/* Change the MTU of all of a master's slaves to match the master */4810static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)4811{4812 struct bonding *bond = netdev_priv(bond_dev);4813 struct slave *slave, *rollback_slave;4814 struct list_head *iter;4815 int res = 0;4816 4817 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);4818 4819 bond_for_each_slave(bond, slave, iter) {4820 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",4821 slave, slave->dev->netdev_ops->ndo_change_mtu);4822 4823 res = dev_set_mtu(slave->dev, new_mtu);4824 4825 if (res) {4826 /* If we failed to set the slave's mtu to the new value4827 * we must abort the operation even in ACTIVE_BACKUP4828 * mode, because if we allow the backup slaves to have4829 * different mtu values than the active slave we'll4830 * need to change their mtu when doing a failover. That4831 * means changing their mtu from timer context, which4832 * is probably not a good idea.4833 */4834 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",4835 res, new_mtu);4836 goto unwind;4837 }4838 }4839 4840 WRITE_ONCE(bond_dev->mtu, new_mtu);4841 4842 return 0;4843 4844unwind:4845 /* unwind from head to the slave that failed */4846 bond_for_each_slave(bond, rollback_slave, iter) {4847 int tmp_res;4848 4849 if (rollback_slave == slave)4850 break;4851 4852 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);4853 if (tmp_res)4854 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",4855 tmp_res);4856 }4857 4858 return res;4859}4860 4861/* Change HW address4862 *4863 * Note that many devices must be down to change the HW address, and4864 * downing the master releases all slaves. We can make bonds full of4865 * bonding devices to test this, however.4866 */4867static int bond_set_mac_address(struct net_device *bond_dev, void *addr)4868{4869 struct bonding *bond = netdev_priv(bond_dev);4870 struct slave *slave, *rollback_slave;4871 struct sockaddr_storage *ss = addr, tmp_ss;4872 struct list_head *iter;4873 int res = 0;4874 4875 if (BOND_MODE(bond) == BOND_MODE_ALB)4876 return bond_alb_set_mac_address(bond_dev, addr);4877 4878 4879 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);4880 4881 /* If fail_over_mac is enabled, do nothing and return success.4882 * Returning an error causes ifenslave to fail.4883 */4884 if (bond->params.fail_over_mac &&4885 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)4886 return 0;4887 4888 if (!is_valid_ether_addr(ss->__data))4889 return -EADDRNOTAVAIL;4890 4891 bond_for_each_slave(bond, slave, iter) {4892 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",4893 __func__, slave);4894 res = dev_set_mac_address(slave->dev, addr, NULL);4895 if (res) {4896 /* TODO: consider downing the slave4897 * and retry ?4898 * User should expect communications4899 * breakage anyway until ARP finish4900 * updating, so...4901 */4902 slave_dbg(bond_dev, slave->dev, "%s: err %d\n",4903 __func__, res);4904 goto unwind;4905 }4906 }4907 4908 /* success */4909 dev_addr_set(bond_dev, ss->__data);4910 return 0;4911 4912unwind:4913 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);4914 tmp_ss.ss_family = bond_dev->type;4915 4916 /* unwind from head to the slave that failed */4917 bond_for_each_slave(bond, rollback_slave, iter) {4918 int tmp_res;4919 4920 if (rollback_slave == slave)4921 break;4922 4923 tmp_res = dev_set_mac_address(rollback_slave->dev,4924 (struct sockaddr *)&tmp_ss, NULL);4925 if (tmp_res) {4926 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",4927 __func__, tmp_res);4928 }4929 }4930 4931 return res;4932}4933 4934/**4935 * bond_get_slave_by_id - get xmit slave with slave_id4936 * @bond: bonding device that is transmitting4937 * @slave_id: slave id up to slave_cnt-1 through which to transmit4938 *4939 * This function tries to get slave with slave_id but in case4940 * it fails, it tries to find the first available slave for transmission.4941 */4942static struct slave *bond_get_slave_by_id(struct bonding *bond,4943 int slave_id)4944{4945 struct list_head *iter;4946 struct slave *slave;4947 int i = slave_id;4948 4949 /* Here we start from the slave with slave_id */4950 bond_for_each_slave_rcu(bond, slave, iter) {4951 if (--i < 0) {4952 if (bond_slave_can_tx(slave))4953 return slave;4954 }4955 }4956 4957 /* Here we start from the first slave up to slave_id */4958 i = slave_id;4959 bond_for_each_slave_rcu(bond, slave, iter) {4960 if (--i < 0)4961 break;4962 if (bond_slave_can_tx(slave))4963 return slave;4964 }4965 /* no slave that can tx has been found */4966 return NULL;4967}4968 4969/**4970 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave4971 * @bond: bonding device to use4972 *4973 * Based on the value of the bonding device's packets_per_slave parameter4974 * this function generates a slave id, which is usually used as the next4975 * slave to transmit through.4976 */4977static u32 bond_rr_gen_slave_id(struct bonding *bond)4978{4979 u32 slave_id;4980 struct reciprocal_value reciprocal_packets_per_slave;4981 int packets_per_slave = bond->params.packets_per_slave;4982 4983 switch (packets_per_slave) {4984 case 0:4985 slave_id = get_random_u32();4986 break;4987 case 1:4988 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);4989 break;4990 default:4991 reciprocal_packets_per_slave =4992 bond->params.reciprocal_packets_per_slave;4993 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);4994 slave_id = reciprocal_divide(slave_id,4995 reciprocal_packets_per_slave);4996 break;4997 }4998 4999 return slave_id;5000}5001 5002static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,5003 struct sk_buff *skb)5004{5005 struct slave *slave;5006 int slave_cnt;5007 u32 slave_id;5008 5009 /* Start with the curr_active_slave that joined the bond as the5010 * default for sending IGMP traffic. For failover purposes one5011 * needs to maintain some consistency for the interface that will5012 * send the join/membership reports. The curr_active_slave found5013 * will send all of this type of traffic.5014 */5015 if (skb->protocol == htons(ETH_P_IP)) {5016 int noff = skb_network_offset(skb);5017 struct iphdr *iph;5018 5019 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))5020 goto non_igmp;5021 5022 iph = ip_hdr(skb);5023 if (iph->protocol == IPPROTO_IGMP) {5024 slave = rcu_dereference(bond->curr_active_slave);5025 if (slave)5026 return slave;5027 return bond_get_slave_by_id(bond, 0);5028 }5029 }5030 5031non_igmp:5032 slave_cnt = READ_ONCE(bond->slave_cnt);5033 if (likely(slave_cnt)) {5034 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;5035 return bond_get_slave_by_id(bond, slave_id);5036 }5037 return NULL;5038}5039 5040static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond,5041 struct xdp_buff *xdp)5042{5043 struct slave *slave;5044 int slave_cnt;5045 u32 slave_id;5046 const struct ethhdr *eth;5047 void *data = xdp->data;5048 5049 if (data + sizeof(struct ethhdr) > xdp->data_end)5050 goto non_igmp;5051 5052 eth = (struct ethhdr *)data;5053 data += sizeof(struct ethhdr);5054 5055 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */5056 if (eth->h_proto == htons(ETH_P_IP)) {5057 const struct iphdr *iph;5058 5059 if (data + sizeof(struct iphdr) > xdp->data_end)5060 goto non_igmp;5061 5062 iph = (struct iphdr *)data;5063 5064 if (iph->protocol == IPPROTO_IGMP) {5065 slave = rcu_dereference(bond->curr_active_slave);5066 if (slave)5067 return slave;5068 return bond_get_slave_by_id(bond, 0);5069 }5070 }5071 5072non_igmp:5073 slave_cnt = READ_ONCE(bond->slave_cnt);5074 if (likely(slave_cnt)) {5075 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;5076 return bond_get_slave_by_id(bond, slave_id);5077 }5078 return NULL;5079}5080 5081static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,5082 struct net_device *bond_dev)5083{5084 struct bonding *bond = netdev_priv(bond_dev);5085 struct slave *slave;5086 5087 slave = bond_xmit_roundrobin_slave_get(bond, skb);5088 if (likely(slave))5089 return bond_dev_queue_xmit(bond, skb, slave->dev);5090 5091 return bond_tx_drop(bond_dev, skb);5092}5093 5094static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond)5095{5096 return rcu_dereference(bond->curr_active_slave);5097}5098 5099/* In active-backup mode, we know that bond->curr_active_slave is always valid if5100 * the bond has a usable interface.5101 */5102static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,5103 struct net_device *bond_dev)5104{5105 struct bonding *bond = netdev_priv(bond_dev);5106 struct slave *slave;5107 5108 slave = bond_xmit_activebackup_slave_get(bond);5109 if (slave)5110 return bond_dev_queue_xmit(bond, skb, slave->dev);5111 5112 return bond_tx_drop(bond_dev, skb);5113}5114 5115/* Use this to update slave_array when (a) it's not appropriate to update5116 * slave_array right away (note that update_slave_array() may sleep)5117 * and / or (b) RTNL is not held.5118 */5119void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)5120{5121 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);5122}5123 5124/* Slave array work handler. Holds only RTNL */5125static void bond_slave_arr_handler(struct work_struct *work)5126{5127 struct bonding *bond = container_of(work, struct bonding,5128 slave_arr_work.work);5129 int ret;5130 5131 if (!rtnl_trylock())5132 goto err;5133 5134 ret = bond_update_slave_arr(bond, NULL);5135 rtnl_unlock();5136 if (ret) {5137 pr_warn_ratelimited("Failed to update slave array from WT\n");5138 goto err;5139 }5140 return;5141 5142err:5143 bond_slave_arr_work_rearm(bond, 1);5144}5145 5146static void bond_skip_slave(struct bond_up_slave *slaves,5147 struct slave *skipslave)5148{5149 int idx;5150 5151 /* Rare situation where caller has asked to skip a specific5152 * slave but allocation failed (most likely!). BTW this is5153 * only possible when the call is initiated from5154 * __bond_release_one(). In this situation; overwrite the5155 * skipslave entry in the array with the last entry from the5156 * array to avoid a situation where the xmit path may choose5157 * this to-be-skipped slave to send a packet out.5158 */5159 for (idx = 0; slaves && idx < slaves->count; idx++) {5160 if (skipslave == slaves->arr[idx]) {5161 slaves->arr[idx] =5162 slaves->arr[slaves->count - 1];5163 slaves->count--;5164 break;5165 }5166 }5167}5168 5169static void bond_set_slave_arr(struct bonding *bond,5170 struct bond_up_slave *usable_slaves,5171 struct bond_up_slave *all_slaves)5172{5173 struct bond_up_slave *usable, *all;5174 5175 usable = rtnl_dereference(bond->usable_slaves);5176 rcu_assign_pointer(bond->usable_slaves, usable_slaves);5177 kfree_rcu(usable, rcu);5178 5179 all = rtnl_dereference(bond->all_slaves);5180 rcu_assign_pointer(bond->all_slaves, all_slaves);5181 kfree_rcu(all, rcu);5182}5183 5184static void bond_reset_slave_arr(struct bonding *bond)5185{5186 bond_set_slave_arr(bond, NULL, NULL);5187}5188 5189/* Build the usable slaves array in control path for modes that use xmit-hash5190 * to determine the slave interface -5191 * (a) BOND_MODE_8023AD5192 * (b) BOND_MODE_XOR5193 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 05194 *5195 * The caller is expected to hold RTNL only and NO other lock!5196 */5197int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)5198{5199 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;5200 struct slave *slave;5201 struct list_head *iter;5202 int agg_id = 0;5203 int ret = 0;5204 5205 might_sleep();5206 5207 usable_slaves = kzalloc(struct_size(usable_slaves, arr,5208 bond->slave_cnt), GFP_KERNEL);5209 all_slaves = kzalloc(struct_size(all_slaves, arr,5210 bond->slave_cnt), GFP_KERNEL);5211 if (!usable_slaves || !all_slaves) {5212 ret = -ENOMEM;5213 goto out;5214 }5215 if (BOND_MODE(bond) == BOND_MODE_8023AD) {5216 struct ad_info ad_info;5217 5218 spin_lock_bh(&bond->mode_lock);5219 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {5220 spin_unlock_bh(&bond->mode_lock);5221 pr_debug("bond_3ad_get_active_agg_info failed\n");5222 /* No active aggragator means it's not safe to use5223 * the previous array.5224 */5225 bond_reset_slave_arr(bond);5226 goto out;5227 }5228 spin_unlock_bh(&bond->mode_lock);5229 agg_id = ad_info.aggregator_id;5230 }5231 bond_for_each_slave(bond, slave, iter) {5232 if (skipslave == slave)5233 continue;5234 5235 all_slaves->arr[all_slaves->count++] = slave;5236 if (BOND_MODE(bond) == BOND_MODE_8023AD) {5237 struct aggregator *agg;5238 5239 agg = SLAVE_AD_INFO(slave)->port.aggregator;5240 if (!agg || agg->aggregator_identifier != agg_id)5241 continue;5242 }5243 if (!bond_slave_can_tx(slave))5244 continue;5245 5246 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",5247 usable_slaves->count);5248 5249 usable_slaves->arr[usable_slaves->count++] = slave;5250 }5251 5252 bond_set_slave_arr(bond, usable_slaves, all_slaves);5253 return ret;5254out:5255 if (ret != 0 && skipslave) {5256 bond_skip_slave(rtnl_dereference(bond->all_slaves),5257 skipslave);5258 bond_skip_slave(rtnl_dereference(bond->usable_slaves),5259 skipslave);5260 }5261 kfree_rcu(all_slaves, rcu);5262 kfree_rcu(usable_slaves, rcu);5263 5264 return ret;5265}5266 5267static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,5268 struct sk_buff *skb,5269 struct bond_up_slave *slaves)5270{5271 struct slave *slave;5272 unsigned int count;5273 u32 hash;5274 5275 hash = bond_xmit_hash(bond, skb);5276 count = slaves ? READ_ONCE(slaves->count) : 0;5277 if (unlikely(!count))5278 return NULL;5279 5280 slave = slaves->arr[hash % count];5281 return slave;5282}5283 5284static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond,5285 struct xdp_buff *xdp)5286{5287 struct bond_up_slave *slaves;5288 unsigned int count;5289 u32 hash;5290 5291 hash = bond_xmit_hash_xdp(bond, xdp);5292 slaves = rcu_dereference(bond->usable_slaves);5293 count = slaves ? READ_ONCE(slaves->count) : 0;5294 if (unlikely(!count))5295 return NULL;5296 5297 return slaves->arr[hash % count];5298}5299 5300/* Use this Xmit function for 3AD as well as XOR modes. The current5301 * usable slave array is formed in the control path. The xmit function5302 * just calculates hash and sends the packet out.5303 */5304static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,5305 struct net_device *dev)5306{5307 struct bonding *bond = netdev_priv(dev);5308 struct bond_up_slave *slaves;5309 struct slave *slave;5310 5311 slaves = rcu_dereference(bond->usable_slaves);5312 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);5313 if (likely(slave))5314 return bond_dev_queue_xmit(bond, skb, slave->dev);5315 5316 return bond_tx_drop(dev, skb);5317}5318 5319/* in broadcast mode, we send everything to all usable interfaces. */5320static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,5321 struct net_device *bond_dev)5322{5323 struct bonding *bond = netdev_priv(bond_dev);5324 struct slave *slave = NULL;5325 struct list_head *iter;5326 bool xmit_suc = false;5327 bool skb_used = false;5328 5329 bond_for_each_slave_rcu(bond, slave, iter) {5330 struct sk_buff *skb2;5331 5332 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))5333 continue;5334 5335 if (bond_is_last_slave(bond, slave)) {5336 skb2 = skb;5337 skb_used = true;5338 } else {5339 skb2 = skb_clone(skb, GFP_ATOMIC);5340 if (!skb2) {5341 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",5342 bond_dev->name, __func__);5343 continue;5344 }5345 }5346 5347 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)5348 xmit_suc = true;5349 }5350 5351 if (!skb_used)5352 dev_kfree_skb_any(skb);5353 5354 if (xmit_suc)5355 return NETDEV_TX_OK;5356 5357 dev_core_stats_tx_dropped_inc(bond_dev);5358 return NET_XMIT_DROP;5359}5360 5361/*------------------------- Device initialization ---------------------------*/5362 5363/* Lookup the slave that corresponds to a qid */5364static inline int bond_slave_override(struct bonding *bond,5365 struct sk_buff *skb)5366{5367 struct slave *slave = NULL;5368 struct list_head *iter;5369 5370 if (!skb_rx_queue_recorded(skb))5371 return 1;5372 5373 /* Find out if any slaves have the same mapping as this skb. */5374 bond_for_each_slave_rcu(bond, slave, iter) {5375 if (READ_ONCE(slave->queue_id) == skb_get_queue_mapping(skb)) {5376 if (bond_slave_is_up(slave) &&5377 slave->link == BOND_LINK_UP) {5378 bond_dev_queue_xmit(bond, skb, slave->dev);5379 return 0;5380 }5381 /* If the slave isn't UP, use default transmit policy. */5382 break;5383 }5384 }5385 5386 return 1;5387}5388 5389 5390static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,5391 struct net_device *sb_dev)5392{5393 /* This helper function exists to help dev_pick_tx get the correct5394 * destination queue. Using a helper function skips a call to5395 * skb_tx_hash and will put the skbs in the queue we expect on their5396 * way down to the bonding driver.5397 */5398 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;5399 5400 /* Save the original txq to restore before passing to the driver */5401 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);5402 5403 if (unlikely(txq >= dev->real_num_tx_queues)) {5404 do {5405 txq -= dev->real_num_tx_queues;5406 } while (txq >= dev->real_num_tx_queues);5407 }5408 return txq;5409}5410 5411static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,5412 struct sk_buff *skb,5413 bool all_slaves)5414{5415 struct bonding *bond = netdev_priv(master_dev);5416 struct bond_up_slave *slaves;5417 struct slave *slave = NULL;5418 5419 switch (BOND_MODE(bond)) {5420 case BOND_MODE_ROUNDROBIN:5421 slave = bond_xmit_roundrobin_slave_get(bond, skb);5422 break;5423 case BOND_MODE_ACTIVEBACKUP:5424 slave = bond_xmit_activebackup_slave_get(bond);5425 break;5426 case BOND_MODE_8023AD:5427 case BOND_MODE_XOR:5428 if (all_slaves)5429 slaves = rcu_dereference(bond->all_slaves);5430 else5431 slaves = rcu_dereference(bond->usable_slaves);5432 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);5433 break;5434 case BOND_MODE_BROADCAST:5435 break;5436 case BOND_MODE_ALB:5437 slave = bond_xmit_alb_slave_get(bond, skb);5438 break;5439 case BOND_MODE_TLB:5440 slave = bond_xmit_tlb_slave_get(bond, skb);5441 break;5442 default:5443 /* Should never happen, mode already checked */5444 WARN_ONCE(true, "Unknown bonding mode");5445 break;5446 }5447 5448 if (slave)5449 return slave->dev;5450 return NULL;5451}5452 5453static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)5454{5455 switch (sk->sk_family) {5456#if IS_ENABLED(CONFIG_IPV6)5457 case AF_INET6:5458 if (ipv6_only_sock(sk) ||5459 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {5460 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;5461 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;5462 flow->addrs.v6addrs.dst = sk->sk_v6_daddr;5463 break;5464 }5465 fallthrough;5466#endif5467 default: /* AF_INET */5468 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;5469 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;5470 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;5471 break;5472 }5473 5474 flow->ports.src = inet_sk(sk)->inet_sport;5475 flow->ports.dst = inet_sk(sk)->inet_dport;5476}5477 5478/**5479 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields5480 * @sk: socket to use for headers5481 *5482 * This function will extract the necessary field from the socket and use5483 * them to generate a hash based on the LAYER34 xmit_policy.5484 * Assumes that sk is a TCP or UDP socket.5485 */5486static u32 bond_sk_hash_l34(struct sock *sk)5487{5488 struct flow_keys flow;5489 u32 hash;5490 5491 bond_sk_to_flow(sk, &flow);5492 5493 /* L4 */5494 memcpy(&hash, &flow.ports.ports, sizeof(hash));5495 /* L3 */5496 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34);5497}5498 5499static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,5500 struct sock *sk)5501{5502 struct bond_up_slave *slaves;5503 struct slave *slave;5504 unsigned int count;5505 u32 hash;5506 5507 slaves = rcu_dereference(bond->usable_slaves);5508 count = slaves ? READ_ONCE(slaves->count) : 0;5509 if (unlikely(!count))5510 return NULL;5511 5512 hash = bond_sk_hash_l34(sk);5513 slave = slaves->arr[hash % count];5514 5515 return slave->dev;5516}5517 5518static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,5519 struct sock *sk)5520{5521 struct bonding *bond = netdev_priv(dev);5522 struct net_device *lower = NULL;5523 5524 rcu_read_lock();5525 if (bond_sk_check(bond))5526 lower = __bond_sk_get_lower_dev(bond, sk);5527 rcu_read_unlock();5528 5529 return lower;5530}5531 5532#if IS_ENABLED(CONFIG_TLS_DEVICE)5533static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,5534 struct net_device *dev)5535{5536 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);5537 5538 /* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded5539 * was true, if tls_device_down is running in parallel, but it's OK,5540 * because bond_get_slave_by_dev has a NULL check.5541 */5542 if (likely(bond_get_slave_by_dev(bond, tls_netdev)))5543 return bond_dev_queue_xmit(bond, skb, tls_netdev);5544 return bond_tx_drop(dev, skb);5545}5546#endif5547 5548static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)5549{5550 struct bonding *bond = netdev_priv(dev);5551 5552 if (bond_should_override_tx_queue(bond) &&5553 !bond_slave_override(bond, skb))5554 return NETDEV_TX_OK;5555 5556#if IS_ENABLED(CONFIG_TLS_DEVICE)5557 if (tls_is_skb_tx_device_offloaded(skb))5558 return bond_tls_device_xmit(bond, skb, dev);5559#endif5560 5561 switch (BOND_MODE(bond)) {5562 case BOND_MODE_ROUNDROBIN:5563 return bond_xmit_roundrobin(skb, dev);5564 case BOND_MODE_ACTIVEBACKUP:5565 return bond_xmit_activebackup(skb, dev);5566 case BOND_MODE_8023AD:5567 case BOND_MODE_XOR:5568 return bond_3ad_xor_xmit(skb, dev);5569 case BOND_MODE_BROADCAST:5570 return bond_xmit_broadcast(skb, dev);5571 case BOND_MODE_ALB:5572 return bond_alb_xmit(skb, dev);5573 case BOND_MODE_TLB:5574 return bond_tlb_xmit(skb, dev);5575 default:5576 /* Should never happen, mode already checked */5577 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));5578 WARN_ON_ONCE(1);5579 return bond_tx_drop(dev, skb);5580 }5581}5582 5583static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)5584{5585 struct bonding *bond = netdev_priv(dev);5586 netdev_tx_t ret = NETDEV_TX_OK;5587 5588 /* If we risk deadlock from transmitting this in the5589 * netpoll path, tell netpoll to queue the frame for later tx5590 */5591 if (unlikely(is_netpoll_tx_blocked(dev)))5592 return NETDEV_TX_BUSY;5593 5594 rcu_read_lock();5595 if (bond_has_slaves(bond))5596 ret = __bond_start_xmit(skb, dev);5597 else5598 ret = bond_tx_drop(dev, skb);5599 rcu_read_unlock();5600 5601 return ret;5602}5603 5604static struct net_device *5605bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp)5606{5607 struct bonding *bond = netdev_priv(bond_dev);5608 struct slave *slave;5609 5610 /* Caller needs to hold rcu_read_lock() */5611 5612 switch (BOND_MODE(bond)) {5613 case BOND_MODE_ROUNDROBIN:5614 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp);5615 break;5616 5617 case BOND_MODE_ACTIVEBACKUP:5618 slave = bond_xmit_activebackup_slave_get(bond);5619 break;5620 5621 case BOND_MODE_8023AD:5622 case BOND_MODE_XOR:5623 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp);5624 break;5625 5626 default:5627 if (net_ratelimit())5628 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n",5629 BOND_MODE(bond));5630 return NULL;5631 }5632 5633 if (slave)5634 return slave->dev;5635 5636 return NULL;5637}5638 5639static int bond_xdp_xmit(struct net_device *bond_dev,5640 int n, struct xdp_frame **frames, u32 flags)5641{5642 int nxmit, err = -ENXIO;5643 5644 rcu_read_lock();5645 5646 for (nxmit = 0; nxmit < n; nxmit++) {5647 struct xdp_frame *frame = frames[nxmit];5648 struct xdp_frame *frames1[] = {frame};5649 struct net_device *slave_dev;5650 struct xdp_buff xdp;5651 5652 xdp_convert_frame_to_buff(frame, &xdp);5653 5654 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp);5655 if (!slave_dev) {5656 err = -ENXIO;5657 break;5658 }5659 5660 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags);5661 if (err < 1)5662 break;5663 }5664 5665 rcu_read_unlock();5666 5667 /* If error happened on the first frame then we can pass the error up, otherwise5668 * report the number of frames that were xmitted.5669 */5670 if (err < 0)5671 return (nxmit == 0 ? err : nxmit);5672 5673 return nxmit;5674}5675 5676static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,5677 struct netlink_ext_ack *extack)5678{5679 struct bonding *bond = netdev_priv(dev);5680 struct list_head *iter;5681 struct slave *slave, *rollback_slave;5682 struct bpf_prog *old_prog;5683 struct netdev_bpf xdp = {5684 .command = XDP_SETUP_PROG,5685 .flags = 0,5686 .prog = prog,5687 .extack = extack,5688 };5689 int err;5690 5691 ASSERT_RTNL();5692 5693 if (!bond_xdp_check(bond))5694 return -EOPNOTSUPP;5695 5696 old_prog = bond->xdp_prog;5697 bond->xdp_prog = prog;5698 5699 bond_for_each_slave(bond, slave, iter) {5700 struct net_device *slave_dev = slave->dev;5701 5702 if (!slave_dev->netdev_ops->ndo_bpf ||5703 !slave_dev->netdev_ops->ndo_xdp_xmit) {5704 SLAVE_NL_ERR(dev, slave_dev, extack,5705 "Slave device does not support XDP");5706 err = -EOPNOTSUPP;5707 goto err;5708 }5709 5710 if (dev_xdp_prog_count(slave_dev) > 0) {5711 SLAVE_NL_ERR(dev, slave_dev, extack,5712 "Slave has XDP program loaded, please unload before enslaving");5713 err = -EOPNOTSUPP;5714 goto err;5715 }5716 5717 err = dev_xdp_propagate(slave_dev, &xdp);5718 if (err < 0) {5719 /* ndo_bpf() sets extack error message */5720 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err);5721 goto err;5722 }5723 if (prog)5724 bpf_prog_inc(prog);5725 }5726 5727 if (prog) {5728 static_branch_inc(&bpf_master_redirect_enabled_key);5729 } else if (old_prog) {5730 bpf_prog_put(old_prog);5731 static_branch_dec(&bpf_master_redirect_enabled_key);5732 }5733 5734 return 0;5735 5736err:5737 /* unwind the program changes */5738 bond->xdp_prog = old_prog;5739 xdp.prog = old_prog;5740 xdp.extack = NULL; /* do not overwrite original error */5741 5742 bond_for_each_slave(bond, rollback_slave, iter) {5743 struct net_device *slave_dev = rollback_slave->dev;5744 int err_unwind;5745 5746 if (slave == rollback_slave)5747 break;5748 5749 err_unwind = dev_xdp_propagate(slave_dev, &xdp);5750 if (err_unwind < 0)5751 slave_err(dev, slave_dev,5752 "Error %d when unwinding XDP program change\n", err_unwind);5753 else if (xdp.prog)5754 bpf_prog_inc(xdp.prog);5755 }5756 return err;5757}5758 5759static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp)5760{5761 switch (xdp->command) {5762 case XDP_SETUP_PROG:5763 return bond_xdp_set(dev, xdp->prog, xdp->extack);5764 default:5765 return -EINVAL;5766 }5767}5768 5769static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)5770{5771 if (speed == 0 || speed == SPEED_UNKNOWN)5772 speed = slave->speed;5773 else5774 speed = min(speed, slave->speed);5775 5776 return speed;5777}5778 5779/* Set the BOND_PHC_INDEX flag to notify user space */5780static int bond_set_phc_index_flag(struct kernel_hwtstamp_config *kernel_cfg)5781{5782 struct ifreq *ifr = kernel_cfg->ifr;5783 struct hwtstamp_config cfg;5784 5785 if (kernel_cfg->copied_to_user) {5786 /* Lower device has a legacy implementation */5787 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))5788 return -EFAULT;5789 5790 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;5791 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))5792 return -EFAULT;5793 } else {5794 kernel_cfg->flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;5795 }5796 5797 return 0;5798}5799 5800static int bond_hwtstamp_get(struct net_device *dev,5801 struct kernel_hwtstamp_config *cfg)5802{5803 struct bonding *bond = netdev_priv(dev);5804 struct net_device *real_dev;5805 int err;5806 5807 real_dev = bond_option_active_slave_get_rcu(bond);5808 if (!real_dev)5809 return -EOPNOTSUPP;5810 5811 err = generic_hwtstamp_get_lower(real_dev, cfg);5812 if (err)5813 return err;5814 5815 return bond_set_phc_index_flag(cfg);5816}5817 5818static int bond_hwtstamp_set(struct net_device *dev,5819 struct kernel_hwtstamp_config *cfg,5820 struct netlink_ext_ack *extack)5821{5822 struct bonding *bond = netdev_priv(dev);5823 struct net_device *real_dev;5824 int err;5825 5826 if (!(cfg->flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX))5827 return -EOPNOTSUPP;5828 5829 real_dev = bond_option_active_slave_get_rcu(bond);5830 if (!real_dev)5831 return -EOPNOTSUPP;5832 5833 err = generic_hwtstamp_set_lower(real_dev, cfg, extack);5834 if (err)5835 return err;5836 5837 return bond_set_phc_index_flag(cfg);5838}5839 5840static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,5841 struct ethtool_link_ksettings *cmd)5842{5843 struct bonding *bond = netdev_priv(bond_dev);5844 struct list_head *iter;5845 struct slave *slave;5846 u32 speed = 0;5847 5848 cmd->base.duplex = DUPLEX_UNKNOWN;5849 cmd->base.port = PORT_OTHER;5850 5851 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we5852 * do not need to check mode. Though link speed might not represent5853 * the true receive or transmit bandwidth (not all modes are symmetric)5854 * this is an accurate maximum.5855 */5856 bond_for_each_slave(bond, slave, iter) {5857 if (bond_slave_can_tx(slave)) {5858 bond_update_speed_duplex(slave);5859 if (slave->speed != SPEED_UNKNOWN) {5860 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)5861 speed = bond_mode_bcast_speed(slave,5862 speed);5863 else5864 speed += slave->speed;5865 }5866 if (cmd->base.duplex == DUPLEX_UNKNOWN &&5867 slave->duplex != DUPLEX_UNKNOWN)5868 cmd->base.duplex = slave->duplex;5869 }5870 }5871 cmd->base.speed = speed ? : SPEED_UNKNOWN;5872 5873 return 0;5874}5875 5876static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,5877 struct ethtool_drvinfo *drvinfo)5878{5879 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));5880 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",5881 BOND_ABI_VERSION);5882}5883 5884static int bond_ethtool_get_ts_info(struct net_device *bond_dev,5885 struct kernel_ethtool_ts_info *info)5886{5887 struct bonding *bond = netdev_priv(bond_dev);5888 struct kernel_ethtool_ts_info ts_info;5889 struct net_device *real_dev;5890 bool sw_tx_support = false;5891 struct list_head *iter;5892 struct slave *slave;5893 int ret = 0;5894 5895 rcu_read_lock();5896 real_dev = bond_option_active_slave_get_rcu(bond);5897 dev_hold(real_dev);5898 rcu_read_unlock();5899 5900 if (real_dev) {5901 ret = ethtool_get_ts_info_by_layer(real_dev, info);5902 } else {5903 /* Check if all slaves support software tx timestamping */5904 rcu_read_lock();5905 bond_for_each_slave_rcu(bond, slave, iter) {5906 ret = ethtool_get_ts_info_by_layer(slave->dev, &ts_info);5907 if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) {5908 sw_tx_support = true;5909 continue;5910 }5911 5912 sw_tx_support = false;5913 break;5914 }5915 rcu_read_unlock();5916 }5917 5918 if (sw_tx_support)5919 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;5920 5921 dev_put(real_dev);5922 return ret;5923}5924 5925static const struct ethtool_ops bond_ethtool_ops = {5926 .get_drvinfo = bond_ethtool_get_drvinfo,5927 .get_link = ethtool_op_get_link,5928 .get_link_ksettings = bond_ethtool_get_link_ksettings,5929 .get_ts_info = bond_ethtool_get_ts_info,5930};5931 5932static const struct net_device_ops bond_netdev_ops = {5933 .ndo_init = bond_init,5934 .ndo_uninit = bond_uninit,5935 .ndo_open = bond_open,5936 .ndo_stop = bond_close,5937 .ndo_start_xmit = bond_start_xmit,5938 .ndo_select_queue = bond_select_queue,5939 .ndo_get_stats64 = bond_get_stats,5940 .ndo_eth_ioctl = bond_eth_ioctl,5941 .ndo_siocbond = bond_do_ioctl,5942 .ndo_siocdevprivate = bond_siocdevprivate,5943 .ndo_change_rx_flags = bond_change_rx_flags,5944 .ndo_set_rx_mode = bond_set_rx_mode,5945 .ndo_change_mtu = bond_change_mtu,5946 .ndo_set_mac_address = bond_set_mac_address,5947 .ndo_neigh_setup = bond_neigh_setup,5948 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,5949 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,5950#ifdef CONFIG_NET_POLL_CONTROLLER5951 .ndo_netpoll_setup = bond_netpoll_setup,5952 .ndo_netpoll_cleanup = bond_netpoll_cleanup,5953 .ndo_poll_controller = bond_poll_controller,5954#endif5955 .ndo_add_slave = bond_enslave,5956 .ndo_del_slave = bond_release,5957 .ndo_fix_features = bond_fix_features,5958 .ndo_features_check = passthru_features_check,5959 .ndo_get_xmit_slave = bond_xmit_get_slave,5960 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev,5961 .ndo_bpf = bond_xdp,5962 .ndo_xdp_xmit = bond_xdp_xmit,5963 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave,5964 .ndo_hwtstamp_get = bond_hwtstamp_get,5965 .ndo_hwtstamp_set = bond_hwtstamp_set,5966};5967 5968static const struct device_type bond_type = {5969 .name = "bond",5970};5971 5972static void bond_destructor(struct net_device *bond_dev)5973{5974 struct bonding *bond = netdev_priv(bond_dev);5975 5976 if (bond->wq)5977 destroy_workqueue(bond->wq);5978 5979 free_percpu(bond->rr_tx_counter);5980}5981 5982void bond_setup(struct net_device *bond_dev)5983{5984 struct bonding *bond = netdev_priv(bond_dev);5985 5986 spin_lock_init(&bond->mode_lock);5987 bond->params = bonding_defaults;5988 5989 /* Initialize pointers */5990 bond->dev = bond_dev;5991 5992 /* Initialize the device entry points */5993 ether_setup(bond_dev);5994 bond_dev->max_mtu = ETH_MAX_MTU;5995 bond_dev->netdev_ops = &bond_netdev_ops;5996 bond_dev->ethtool_ops = &bond_ethtool_ops;5997 5998 bond_dev->needs_free_netdev = true;5999 bond_dev->priv_destructor = bond_destructor;6000 6001 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);6002 6003 /* Initialize the device options */6004 bond_dev->flags |= IFF_MASTER;6005 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;6006 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);6007 6008#ifdef CONFIG_XFRM_OFFLOAD6009 /* set up xfrm device ops (only supported in active-backup right now) */6010 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;6011 INIT_LIST_HEAD(&bond->ipsec_list);6012 mutex_init(&bond->ipsec_lock);6013#endif /* CONFIG_XFRM_OFFLOAD */6014 6015 /* don't acquire bond device's netif_tx_lock when transmitting */6016 bond_dev->lltx = true;6017 6018 /* Don't allow bond devices to change network namespaces. */6019 bond_dev->netns_local = true;6020 6021 /* By default, we declare the bond to be fully6022 * VLAN hardware accelerated capable. Special6023 * care is taken in the various xmit functions6024 * when there are slaves that are not hw accel6025 * capable6026 */6027 6028 bond_dev->hw_features = BOND_VLAN_FEATURES |6029 NETIF_F_HW_VLAN_CTAG_RX |6030 NETIF_F_HW_VLAN_CTAG_FILTER |6031 NETIF_F_HW_VLAN_STAG_RX |6032 NETIF_F_HW_VLAN_STAG_FILTER;6033 6034 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;6035 bond_dev->features |= bond_dev->hw_features;6036 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;6037#ifdef CONFIG_XFRM_OFFLOAD6038 bond_dev->hw_features |= BOND_XFRM_FEATURES;6039 /* Only enable XFRM features if this is an active-backup config */6040 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)6041 bond_dev->features |= BOND_XFRM_FEATURES;6042#endif /* CONFIG_XFRM_OFFLOAD */6043}6044 6045/* Destroy a bonding device.6046 * Must be under rtnl_lock when this function is called.6047 */6048static void bond_uninit(struct net_device *bond_dev)6049{6050 struct bonding *bond = netdev_priv(bond_dev);6051 struct list_head *iter;6052 struct slave *slave;6053 6054 bond_netpoll_cleanup(bond_dev);6055 6056 /* Release the bonded slaves */6057 bond_for_each_slave(bond, slave, iter)6058 __bond_release_one(bond_dev, slave->dev, true, true);6059 netdev_info(bond_dev, "Released all slaves\n");6060 6061#ifdef CONFIG_XFRM_OFFLOAD6062 mutex_destroy(&bond->ipsec_lock);6063#endif /* CONFIG_XFRM_OFFLOAD */6064 6065 bond_set_slave_arr(bond, NULL, NULL);6066 6067 list_del_rcu(&bond->bond_list);6068 6069 bond_debug_unregister(bond);6070}6071 6072/*------------------------- Module initialization ---------------------------*/6073 6074static int __init bond_check_params(struct bond_params *params)6075{6076 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;6077 struct bond_opt_value newval;6078 const struct bond_opt_value *valptr;6079 int arp_all_targets_value = 0;6080 u16 ad_actor_sys_prio = 0;6081 u16 ad_user_port_key = 0;6082 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };6083 int arp_ip_count;6084 int bond_mode = BOND_MODE_ROUNDROBIN;6085 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;6086 int lacp_fast = 0;6087 int tlb_dynamic_lb;6088 6089 /* Convert string parameters. */6090 if (mode) {6091 bond_opt_initstr(&newval, mode);6092 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);6093 if (!valptr) {6094 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);6095 return -EINVAL;6096 }6097 bond_mode = valptr->value;6098 }6099 6100 if (xmit_hash_policy) {6101 if (bond_mode == BOND_MODE_ROUNDROBIN ||6102 bond_mode == BOND_MODE_ACTIVEBACKUP ||6103 bond_mode == BOND_MODE_BROADCAST) {6104 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",6105 bond_mode_name(bond_mode));6106 } else {6107 bond_opt_initstr(&newval, xmit_hash_policy);6108 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),6109 &newval);6110 if (!valptr) {6111 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",6112 xmit_hash_policy);6113 return -EINVAL;6114 }6115 xmit_hashtype = valptr->value;6116 }6117 }6118 6119 if (lacp_rate) {6120 if (bond_mode != BOND_MODE_8023AD) {6121 pr_info("lacp_rate param is irrelevant in mode %s\n",6122 bond_mode_name(bond_mode));6123 } else {6124 bond_opt_initstr(&newval, lacp_rate);6125 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),6126 &newval);6127 if (!valptr) {6128 pr_err("Error: Invalid lacp rate \"%s\"\n",6129 lacp_rate);6130 return -EINVAL;6131 }6132 lacp_fast = valptr->value;6133 }6134 }6135 6136 if (ad_select) {6137 bond_opt_initstr(&newval, ad_select);6138 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),6139 &newval);6140 if (!valptr) {6141 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);6142 return -EINVAL;6143 }6144 params->ad_select = valptr->value;6145 if (bond_mode != BOND_MODE_8023AD)6146 pr_warn("ad_select param only affects 802.3ad mode\n");6147 } else {6148 params->ad_select = BOND_AD_STABLE;6149 }6150 6151 if (max_bonds < 0) {6152 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",6153 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);6154 max_bonds = BOND_DEFAULT_MAX_BONDS;6155 }6156 6157 if (miimon < 0) {6158 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",6159 miimon, INT_MAX);6160 miimon = 0;6161 }6162 6163 if (updelay < 0) {6164 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",6165 updelay, INT_MAX);6166 updelay = 0;6167 }6168 6169 if (downdelay < 0) {6170 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",6171 downdelay, INT_MAX);6172 downdelay = 0;6173 }6174 6175 if ((use_carrier != 0) && (use_carrier != 1)) {6176 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",6177 use_carrier);6178 use_carrier = 1;6179 }6180 6181 if (num_peer_notif < 0 || num_peer_notif > 255) {6182 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",6183 num_peer_notif);6184 num_peer_notif = 1;6185 }6186 6187 /* reset values for 802.3ad/TLB/ALB */6188 if (!bond_mode_uses_arp(bond_mode)) {6189 if (!miimon) {6190 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");6191 pr_warn("Forcing miimon to 100msec\n");6192 miimon = BOND_DEFAULT_MIIMON;6193 }6194 }6195 6196 if (tx_queues < 1 || tx_queues > 255) {6197 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",6198 tx_queues, BOND_DEFAULT_TX_QUEUES);6199 tx_queues = BOND_DEFAULT_TX_QUEUES;6200 }6201 6202 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {6203 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",6204 all_slaves_active);6205 all_slaves_active = 0;6206 }6207 6208 if (resend_igmp < 0 || resend_igmp > 255) {6209 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",6210 resend_igmp, BOND_DEFAULT_RESEND_IGMP);6211 resend_igmp = BOND_DEFAULT_RESEND_IGMP;6212 }6213 6214 bond_opt_initval(&newval, packets_per_slave);6215 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {6216 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",6217 packets_per_slave, USHRT_MAX);6218 packets_per_slave = 1;6219 }6220 6221 if (bond_mode == BOND_MODE_ALB) {6222 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",6223 updelay);6224 }6225 6226 if (!miimon) {6227 if (updelay || downdelay) {6228 /* just warn the user the up/down delay will have6229 * no effect since miimon is zero...6230 */6231 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",6232 updelay, downdelay);6233 }6234 } else {6235 /* don't allow arp monitoring */6236 if (arp_interval) {6237 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",6238 miimon, arp_interval);6239 arp_interval = 0;6240 }6241 6242 if ((updelay % miimon) != 0) {6243 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",6244 updelay, miimon, (updelay / miimon) * miimon);6245 }6246 6247 updelay /= miimon;6248 6249 if ((downdelay % miimon) != 0) {6250 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",6251 downdelay, miimon,6252 (downdelay / miimon) * miimon);6253 }6254 6255 downdelay /= miimon;6256 }6257 6258 if (arp_interval < 0) {6259 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",6260 arp_interval, INT_MAX);6261 arp_interval = 0;6262 }6263 6264 for (arp_ip_count = 0, i = 0;6265 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {6266 __be32 ip;6267 6268 /* not a complete check, but good enough to catch mistakes */6269 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||6270 !bond_is_ip_target_ok(ip)) {6271 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",6272 arp_ip_target[i]);6273 arp_interval = 0;6274 } else {6275 if (bond_get_targets_ip(arp_target, ip) == -1)6276 arp_target[arp_ip_count++] = ip;6277 else6278 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",6279 &ip);6280 }6281 }6282 6283 if (arp_interval && !arp_ip_count) {6284 /* don't allow arping if no arp_ip_target given... */6285 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",6286 arp_interval);6287 arp_interval = 0;6288 }6289 6290 if (arp_validate) {6291 if (!arp_interval) {6292 pr_err("arp_validate requires arp_interval\n");6293 return -EINVAL;6294 }6295 6296 bond_opt_initstr(&newval, arp_validate);6297 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),6298 &newval);6299 if (!valptr) {6300 pr_err("Error: invalid arp_validate \"%s\"\n",6301 arp_validate);6302 return -EINVAL;6303 }6304 arp_validate_value = valptr->value;6305 } else {6306 arp_validate_value = 0;6307 }6308 6309 if (arp_all_targets) {6310 bond_opt_initstr(&newval, arp_all_targets);6311 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),6312 &newval);6313 if (!valptr) {6314 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",6315 arp_all_targets);6316 arp_all_targets_value = 0;6317 } else {6318 arp_all_targets_value = valptr->value;6319 }6320 }6321 6322 if (miimon) {6323 pr_info("MII link monitoring set to %d ms\n", miimon);6324 } else if (arp_interval) {6325 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,6326 arp_validate_value);6327 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",6328 arp_interval, valptr->string, arp_ip_count);6329 6330 for (i = 0; i < arp_ip_count; i++)6331 pr_cont(" %s", arp_ip_target[i]);6332 6333 pr_cont("\n");6334 6335 } else if (max_bonds) {6336 /* miimon and arp_interval not set, we need one so things6337 * work as expected, see bonding.txt for details6338 */6339 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");6340 }6341 6342 if (primary && !bond_mode_uses_primary(bond_mode)) {6343 /* currently, using a primary only makes sense6344 * in active backup, TLB or ALB modes6345 */6346 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",6347 primary, bond_mode_name(bond_mode));6348 primary = NULL;6349 }6350 6351 if (primary && primary_reselect) {6352 bond_opt_initstr(&newval, primary_reselect);6353 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),6354 &newval);6355 if (!valptr) {6356 pr_err("Error: Invalid primary_reselect \"%s\"\n",6357 primary_reselect);6358 return -EINVAL;6359 }6360 primary_reselect_value = valptr->value;6361 } else {6362 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;6363 }6364 6365 if (fail_over_mac) {6366 bond_opt_initstr(&newval, fail_over_mac);6367 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),6368 &newval);6369 if (!valptr) {6370 pr_err("Error: invalid fail_over_mac \"%s\"\n",6371 fail_over_mac);6372 return -EINVAL;6373 }6374 fail_over_mac_value = valptr->value;6375 if (bond_mode != BOND_MODE_ACTIVEBACKUP)6376 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");6377 } else {6378 fail_over_mac_value = BOND_FOM_NONE;6379 }6380 6381 bond_opt_initstr(&newval, "default");6382 valptr = bond_opt_parse(6383 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),6384 &newval);6385 if (!valptr) {6386 pr_err("Error: No ad_actor_sys_prio default value");6387 return -EINVAL;6388 }6389 ad_actor_sys_prio = valptr->value;6390 6391 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),6392 &newval);6393 if (!valptr) {6394 pr_err("Error: No ad_user_port_key default value");6395 return -EINVAL;6396 }6397 ad_user_port_key = valptr->value;6398 6399 bond_opt_initstr(&newval, "default");6400 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);6401 if (!valptr) {6402 pr_err("Error: No tlb_dynamic_lb default value");6403 return -EINVAL;6404 }6405 tlb_dynamic_lb = valptr->value;6406 6407 if (lp_interval == 0) {6408 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",6409 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);6410 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;6411 }6412 6413 /* fill params struct with the proper values */6414 params->mode = bond_mode;6415 params->xmit_policy = xmit_hashtype;6416 params->miimon = miimon;6417 params->num_peer_notif = num_peer_notif;6418 params->arp_interval = arp_interval;6419 params->arp_validate = arp_validate_value;6420 params->arp_all_targets = arp_all_targets_value;6421 params->missed_max = 2;6422 params->updelay = updelay;6423 params->downdelay = downdelay;6424 params->peer_notif_delay = 0;6425 params->use_carrier = use_carrier;6426 params->lacp_active = 1;6427 params->lacp_fast = lacp_fast;6428 params->primary[0] = 0;6429 params->primary_reselect = primary_reselect_value;6430 params->fail_over_mac = fail_over_mac_value;6431 params->tx_queues = tx_queues;6432 params->all_slaves_active = all_slaves_active;6433 params->resend_igmp = resend_igmp;6434 params->min_links = min_links;6435 params->lp_interval = lp_interval;6436 params->packets_per_slave = packets_per_slave;6437 params->tlb_dynamic_lb = tlb_dynamic_lb;6438 params->ad_actor_sys_prio = ad_actor_sys_prio;6439 eth_zero_addr(params->ad_actor_system);6440 params->ad_user_port_key = ad_user_port_key;6441 params->coupled_control = 1;6442 if (packets_per_slave > 0) {6443 params->reciprocal_packets_per_slave =6444 reciprocal_value(packets_per_slave);6445 } else {6446 /* reciprocal_packets_per_slave is unused if6447 * packets_per_slave is 0 or 1, just initialize it6448 */6449 params->reciprocal_packets_per_slave =6450 (struct reciprocal_value) { 0 };6451 }6452 6453 if (primary)6454 strscpy_pad(params->primary, primary, sizeof(params->primary));6455 6456 memcpy(params->arp_targets, arp_target, sizeof(arp_target));6457#if IS_ENABLED(CONFIG_IPV6)6458 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS);6459#endif6460 6461 return 0;6462}6463 6464/* Called from registration process */6465static int bond_init(struct net_device *bond_dev)6466{6467 struct bonding *bond = netdev_priv(bond_dev);6468 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);6469 6470 netdev_dbg(bond_dev, "Begin bond_init\n");6471 6472 bond->wq = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM,6473 bond_dev->name);6474 if (!bond->wq)6475 return -ENOMEM;6476 6477 bond->notifier_ctx = false;6478 6479 spin_lock_init(&bond->stats_lock);6480 netdev_lockdep_set_classes(bond_dev);6481 6482 list_add_tail_rcu(&bond->bond_list, &bn->dev_list);6483 6484 bond_prepare_sysfs_group(bond);6485 6486 bond_debug_register(bond);6487 6488 /* Ensure valid dev_addr */6489 if (is_zero_ether_addr(bond_dev->dev_addr) &&6490 bond_dev->addr_assign_type == NET_ADDR_PERM)6491 eth_hw_addr_random(bond_dev);6492 6493 return 0;6494}6495 6496unsigned int bond_get_num_tx_queues(void)6497{6498 return tx_queues;6499}6500 6501/* Create a new bond based on the specified name and bonding parameters.6502 * If name is NULL, obtain a suitable "bond%d" name for us.6503 * Caller must NOT hold rtnl_lock; we need to release it here before we6504 * set up our sysfs entries.6505 */6506int bond_create(struct net *net, const char *name)6507{6508 struct net_device *bond_dev;6509 struct bonding *bond;6510 int res = -ENOMEM;6511 6512 rtnl_lock();6513 6514 bond_dev = alloc_netdev_mq(sizeof(struct bonding),6515 name ? name : "bond%d", NET_NAME_UNKNOWN,6516 bond_setup, tx_queues);6517 if (!bond_dev)6518 goto out;6519 6520 bond = netdev_priv(bond_dev);6521 dev_net_set(bond_dev, net);6522 bond_dev->rtnl_link_ops = &bond_link_ops;6523 6524 res = register_netdevice(bond_dev);6525 if (res < 0) {6526 free_netdev(bond_dev);6527 goto out;6528 }6529 6530 netif_carrier_off(bond_dev);6531 6532 bond_work_init_all(bond);6533 6534out:6535 rtnl_unlock();6536 return res;6537}6538 6539static int __net_init bond_net_init(struct net *net)6540{6541 struct bond_net *bn = net_generic(net, bond_net_id);6542 6543 bn->net = net;6544 INIT_LIST_HEAD(&bn->dev_list);6545 6546 bond_create_proc_dir(bn);6547 bond_create_sysfs(bn);6548 6549 return 0;6550}6551 6552/* According to commit 69b0216ac255 ("bonding: fix bonding_masters6553 * race condition in bond unloading") we need to remove sysfs files6554 * before we remove our devices (done later in bond_net_exit_batch_rtnl())6555 */6556static void __net_exit bond_net_pre_exit(struct net *net)6557{6558 struct bond_net *bn = net_generic(net, bond_net_id);6559 6560 bond_destroy_sysfs(bn);6561}6562 6563static void __net_exit bond_net_exit_batch_rtnl(struct list_head *net_list,6564 struct list_head *dev_kill_list)6565{6566 struct bond_net *bn;6567 struct net *net;6568 6569 /* Kill off any bonds created after unregistering bond rtnl ops */6570 list_for_each_entry(net, net_list, exit_list) {6571 struct bonding *bond, *tmp_bond;6572 6573 bn = net_generic(net, bond_net_id);6574 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)6575 unregister_netdevice_queue(bond->dev, dev_kill_list);6576 }6577}6578 6579/* According to commit 23fa5c2caae0 ("bonding: destroy proc directory6580 * only after all bonds are gone") bond_destroy_proc_dir() is called6581 * after bond_net_exit_batch_rtnl() has completed.6582 */6583static void __net_exit bond_net_exit_batch(struct list_head *net_list)6584{6585 struct bond_net *bn;6586 struct net *net;6587 6588 list_for_each_entry(net, net_list, exit_list) {6589 bn = net_generic(net, bond_net_id);6590 bond_destroy_proc_dir(bn);6591 }6592}6593 6594static struct pernet_operations bond_net_ops = {6595 .init = bond_net_init,6596 .pre_exit = bond_net_pre_exit,6597 .exit_batch_rtnl = bond_net_exit_batch_rtnl,6598 .exit_batch = bond_net_exit_batch,6599 .id = &bond_net_id,6600 .size = sizeof(struct bond_net),6601};6602 6603static int __init bonding_init(void)6604{6605 int i;6606 int res;6607 6608 res = bond_check_params(&bonding_defaults);6609 if (res)6610 goto out;6611 6612 bond_create_debugfs();6613 6614 res = register_pernet_subsys(&bond_net_ops);6615 if (res)6616 goto err_net_ops;6617 6618 res = bond_netlink_init();6619 if (res)6620 goto err_link;6621 6622 for (i = 0; i < max_bonds; i++) {6623 res = bond_create(&init_net, NULL);6624 if (res)6625 goto err;6626 }6627 6628 skb_flow_dissector_init(&flow_keys_bonding,6629 flow_keys_bonding_keys,6630 ARRAY_SIZE(flow_keys_bonding_keys));6631 6632 register_netdevice_notifier(&bond_netdev_notifier);6633out:6634 return res;6635err:6636 bond_netlink_fini();6637err_link:6638 unregister_pernet_subsys(&bond_net_ops);6639err_net_ops:6640 bond_destroy_debugfs();6641 goto out;6642 6643}6644 6645static void __exit bonding_exit(void)6646{6647 unregister_netdevice_notifier(&bond_netdev_notifier);6648 6649 bond_netlink_fini();6650 unregister_pernet_subsys(&bond_net_ops);6651 6652 bond_destroy_debugfs();6653 6654#ifdef CONFIG_NET_POLL_CONTROLLER6655 /* Make sure we don't have an imbalance on our netpoll blocking */6656 WARN_ON(atomic_read(&netpoll_block_tx));6657#endif6658}6659 6660module_init(bonding_init);6661module_exit(bonding_exit);6662MODULE_LICENSE("GPL");6663MODULE_DESCRIPTION(DRV_DESCRIPTION);6664MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");6665