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Linux/drivers/net/bonding/bond_main.c

  1 /*
  2  * originally based on the dummy device.
  3  *
  4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
  5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
  6  *
  7  * bonding.c: an Ethernet Bonding driver
  8  *
  9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
 10  *      Cisco 5500
 11  *      Sun Trunking (Solaris)
 12  *      Alteon AceDirector Trunks
 13  *      Linux Bonding
 14  *      and probably many L2 switches ...
 15  *
 16  * How it works:
 17  *    ifconfig bond0 ipaddress netmask up
 18  *      will setup a network device, with an ip address.  No mac address
 19  *      will be assigned at this time.  The hw mac address will come from
 20  *      the first slave bonded to the channel.  All slaves will then use
 21  *      this hw mac address.
 22  *
 23  *    ifconfig bond0 down
 24  *         will release all slaves, marking them as down.
 25  *
 26  *    ifenslave bond0 eth0
 27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
 28  *      a: be used as initial mac address
 29  *      b: if a hw mac address already is there, eth0's hw mac address
 30  *         will then be set from bond0.
 31  *
 32  */
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/module.h>
 36 #include <linux/types.h>
 37 #include <linux/fcntl.h>
 38 #include <linux/interrupt.h>
 39 #include <linux/ptrace.h>
 40 #include <linux/ioport.h>
 41 #include <linux/in.h>
 42 #include <net/ip.h>
 43 #include <linux/ip.h>
 44 #include <linux/tcp.h>
 45 #include <linux/udp.h>
 46 #include <linux/slab.h>
 47 #include <linux/string.h>
 48 #include <linux/init.h>
 49 #include <linux/timer.h>
 50 #include <linux/socket.h>
 51 #include <linux/ctype.h>
 52 #include <linux/inet.h>
 53 #include <linux/bitops.h>
 54 #include <linux/io.h>
 55 #include <asm/dma.h>
 56 #include <linux/uaccess.h>
 57 #include <linux/errno.h>
 58 #include <linux/netdevice.h>
 59 #include <linux/inetdevice.h>
 60 #include <linux/igmp.h>
 61 #include <linux/etherdevice.h>
 62 #include <linux/skbuff.h>
 63 #include <net/sock.h>
 64 #include <linux/rtnetlink.h>
 65 #include <linux/smp.h>
 66 #include <linux/if_ether.h>
 67 #include <net/arp.h>
 68 #include <linux/mii.h>
 69 #include <linux/ethtool.h>
 70 #include <linux/if_vlan.h>
 71 #include <linux/if_bonding.h>
 72 #include <linux/jiffies.h>
 73 #include <linux/preempt.h>
 74 #include <net/route.h>
 75 #include <net/net_namespace.h>
 76 #include <net/netns/generic.h>
 77 #include <net/pkt_sched.h>
 78 #include <linux/rculist.h>
 79 #include <net/flow_dissector.h>
 80 #include <net/switchdev.h>
 81 #include <net/bonding.h>
 82 #include <net/bond_3ad.h>
 83 #include <net/bond_alb.h>
 84 
 85 #include "bonding_priv.h"
 86 
 87 /*---------------------------- Module parameters ----------------------------*/
 88 
 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
 90 
 91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 93 static int num_peer_notif = 1;
 94 static int miimon;
 95 static int updelay;
 96 static int downdelay;
 97 static int use_carrier  = 1;
 98 static char *mode;
 99 static char *primary;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *arp_all_targets;
109 static char *fail_over_mac;
110 static int all_slaves_active;
111 static struct bond_params bonding_defaults;
112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 static int packets_per_slave = 1;
114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
115 
116 module_param(max_bonds, int, 0);
117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
118 module_param(tx_queues, int, 0);
119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
122                                "failover event (alias of num_unsol_na)");
123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
125                                "failover event (alias of num_grat_arp)");
126 module_param(miimon, int, 0);
127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
128 module_param(updelay, int, 0);
129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
130 module_param(downdelay, int, 0);
131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
132                             "in milliseconds");
133 module_param(use_carrier, int, 0);
134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
135                               "0 for off, 1 for on (default)");
136 module_param(mode, charp, 0);
137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
138                        "1 for active-backup, 2 for balance-xor, "
139                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
140                        "6 for balance-alb");
141 module_param(primary, charp, 0);
142 MODULE_PARM_DESC(primary, "Primary network device to use");
143 module_param(primary_reselect, charp, 0);
144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
145                                    "once it comes up; "
146                                    "0 for always (default), "
147                                    "1 for only if speed of primary is "
148                                    "better, "
149                                    "2 for only on active slave "
150                                    "failure");
151 module_param(lacp_rate, charp, 0);
152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
153                             "0 for slow, 1 for fast");
154 module_param(ad_select, charp, 0);
155 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
156                             "0 for stable (default), 1 for bandwidth, "
157                             "2 for count");
158 module_param(min_links, int, 0);
159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
160 
161 module_param(xmit_hash_policy, charp, 0);
162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
163                                    "0 for layer 2 (default), 1 for layer 3+4, "
164                                    "2 for layer 2+3, 3 for encap layer 2+3, "
165                                    "4 for encap layer 3+4");
166 module_param(arp_interval, int, 0);
167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
168 module_param_array(arp_ip_target, charp, NULL, 0);
169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
170 module_param(arp_validate, charp, 0);
171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
172                                "0 for none (default), 1 for active, "
173                                "2 for backup, 3 for all");
174 module_param(arp_all_targets, charp, 0);
175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
176 module_param(fail_over_mac, charp, 0);
177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
178                                 "the same MAC; 0 for none (default), "
179                                 "1 for active, 2 for follow");
180 module_param(all_slaves_active, int, 0);
181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
182                                      "by setting active flag for all slaves; "
183                                      "0 for never (default), 1 for always.");
184 module_param(resend_igmp, int, 0);
185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
186                               "link failure");
187 module_param(packets_per_slave, int, 0);
188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
189                                     "mode; 0 for a random slave, 1 packet per "
190                                     "slave (default), >1 packets per slave.");
191 module_param(lp_interval, uint, 0);
192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
193                               "the bonding driver sends learning packets to "
194                               "each slaves peer switch. The default is 1.");
195 
196 /*----------------------------- Global variables ----------------------------*/
197 
198 #ifdef CONFIG_NET_POLL_CONTROLLER
199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
200 #endif
201 
202 int bond_net_id __read_mostly;
203 
204 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
205 static int arp_ip_count;
206 static int bond_mode    = BOND_MODE_ROUNDROBIN;
207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
208 static int lacp_fast;
209 
210 /*-------------------------- Forward declarations ---------------------------*/
211 
212 static int bond_init(struct net_device *bond_dev);
213 static void bond_uninit(struct net_device *bond_dev);
214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
215                                                 struct rtnl_link_stats64 *stats);
216 static void bond_slave_arr_handler(struct work_struct *work);
217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
218                                   int mod);
219 
220 /*---------------------------- General routines -----------------------------*/
221 
222 const char *bond_mode_name(int mode)
223 {
224         static const char *names[] = {
225                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
226                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
227                 [BOND_MODE_XOR] = "load balancing (xor)",
228                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
229                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
230                 [BOND_MODE_TLB] = "transmit load balancing",
231                 [BOND_MODE_ALB] = "adaptive load balancing",
232         };
233 
234         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
235                 return "unknown";
236 
237         return names[mode];
238 }
239 
240 /*---------------------------------- VLAN -----------------------------------*/
241 
242 /**
243  * bond_dev_queue_xmit - Prepare skb for xmit.
244  *
245  * @bond: bond device that got this skb for tx.
246  * @skb: hw accel VLAN tagged skb to transmit
247  * @slave_dev: slave that is supposed to xmit this skbuff
248  */
249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
250                         struct net_device *slave_dev)
251 {
252         skb->dev = slave_dev;
253 
254         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
255                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
256         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
257 
258         if (unlikely(netpoll_tx_running(bond->dev)))
259                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
260         else
261                 dev_queue_xmit(skb);
262 }
263 
264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
265  * We don't protect the slave list iteration with a lock because:
266  * a. This operation is performed in IOCTL context,
267  * b. The operation is protected by the RTNL semaphore in the 8021q code,
268  * c. Holding a lock with BH disabled while directly calling a base driver
269  *    entry point is generally a BAD idea.
270  *
271  * The design of synchronization/protection for this operation in the 8021q
272  * module is good for one or more VLAN devices over a single physical device
273  * and cannot be extended for a teaming solution like bonding, so there is a
274  * potential race condition here where a net device from the vlan group might
275  * be referenced (either by a base driver or the 8021q code) while it is being
276  * removed from the system. However, it turns out we're not making matters
277  * worse, and if it works for regular VLAN usage it will work here too.
278 */
279 
280 /**
281  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
282  * @bond_dev: bonding net device that got called
283  * @vid: vlan id being added
284  */
285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
286                                 __be16 proto, u16 vid)
287 {
288         struct bonding *bond = netdev_priv(bond_dev);
289         struct slave *slave, *rollback_slave;
290         struct list_head *iter;
291         int res;
292 
293         bond_for_each_slave(bond, slave, iter) {
294                 res = vlan_vid_add(slave->dev, proto, vid);
295                 if (res)
296                         goto unwind;
297         }
298 
299         return 0;
300 
301 unwind:
302         /* unwind to the slave that failed */
303         bond_for_each_slave(bond, rollback_slave, iter) {
304                 if (rollback_slave == slave)
305                         break;
306 
307                 vlan_vid_del(rollback_slave->dev, proto, vid);
308         }
309 
310         return res;
311 }
312 
313 /**
314  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
315  * @bond_dev: bonding net device that got called
316  * @vid: vlan id being removed
317  */
318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
319                                  __be16 proto, u16 vid)
320 {
321         struct bonding *bond = netdev_priv(bond_dev);
322         struct list_head *iter;
323         struct slave *slave;
324 
325         bond_for_each_slave(bond, slave, iter)
326                 vlan_vid_del(slave->dev, proto, vid);
327 
328         if (bond_is_lb(bond))
329                 bond_alb_clear_vlan(bond, vid);
330 
331         return 0;
332 }
333 
334 /*------------------------------- Link status -------------------------------*/
335 
336 /* Set the carrier state for the master according to the state of its
337  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
338  * do special 802.3ad magic.
339  *
340  * Returns zero if carrier state does not change, nonzero if it does.
341  */
342 int bond_set_carrier(struct bonding *bond)
343 {
344         struct list_head *iter;
345         struct slave *slave;
346 
347         if (!bond_has_slaves(bond))
348                 goto down;
349 
350         if (BOND_MODE(bond) == BOND_MODE_8023AD)
351                 return bond_3ad_set_carrier(bond);
352 
353         bond_for_each_slave(bond, slave, iter) {
354                 if (slave->link == BOND_LINK_UP) {
355                         if (!netif_carrier_ok(bond->dev)) {
356                                 netif_carrier_on(bond->dev);
357                                 return 1;
358                         }
359                         return 0;
360                 }
361         }
362 
363 down:
364         if (netif_carrier_ok(bond->dev)) {
365                 netif_carrier_off(bond->dev);
366                 return 1;
367         }
368         return 0;
369 }
370 
371 /* Get link speed and duplex from the slave's base driver
372  * using ethtool. If for some reason the call fails or the
373  * values are invalid, set speed and duplex to -1,
374  * and return.
375  */
376 static void bond_update_speed_duplex(struct slave *slave)
377 {
378         struct net_device *slave_dev = slave->dev;
379         struct ethtool_link_ksettings ecmd;
380         int res;
381 
382         slave->speed = SPEED_UNKNOWN;
383         slave->duplex = DUPLEX_UNKNOWN;
384 
385         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
386         if (res < 0)
387                 return;
388 
389         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
390                 return;
391 
392         switch (ecmd.base.duplex) {
393         case DUPLEX_FULL:
394         case DUPLEX_HALF:
395                 break;
396         default:
397                 return;
398         }
399 
400         slave->speed = ecmd.base.speed;
401         slave->duplex = ecmd.base.duplex;
402 
403         return;
404 }
405 
406 const char *bond_slave_link_status(s8 link)
407 {
408         switch (link) {
409         case BOND_LINK_UP:
410                 return "up";
411         case BOND_LINK_FAIL:
412                 return "going down";
413         case BOND_LINK_DOWN:
414                 return "down";
415         case BOND_LINK_BACK:
416                 return "going back";
417         default:
418                 return "unknown";
419         }
420 }
421 
422 /* if <dev> supports MII link status reporting, check its link status.
423  *
424  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425  * depending upon the setting of the use_carrier parameter.
426  *
427  * Return either BMSR_LSTATUS, meaning that the link is up (or we
428  * can't tell and just pretend it is), or 0, meaning that the link is
429  * down.
430  *
431  * If reporting is non-zero, instead of faking link up, return -1 if
432  * both ETHTOOL and MII ioctls fail (meaning the device does not
433  * support them).  If use_carrier is set, return whatever it says.
434  * It'd be nice if there was a good way to tell if a driver supports
435  * netif_carrier, but there really isn't.
436  */
437 static int bond_check_dev_link(struct bonding *bond,
438                                struct net_device *slave_dev, int reporting)
439 {
440         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441         int (*ioctl)(struct net_device *, struct ifreq *, int);
442         struct ifreq ifr;
443         struct mii_ioctl_data *mii;
444 
445         if (!reporting && !netif_running(slave_dev))
446                 return 0;
447 
448         if (bond->params.use_carrier)
449                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
450 
451         /* Try to get link status using Ethtool first. */
452         if (slave_dev->ethtool_ops->get_link)
453                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
454                         BMSR_LSTATUS : 0;
455 
456         /* Ethtool can't be used, fallback to MII ioctls. */
457         ioctl = slave_ops->ndo_do_ioctl;
458         if (ioctl) {
459                 /* TODO: set pointer to correct ioctl on a per team member
460                  *       bases to make this more efficient. that is, once
461                  *       we determine the correct ioctl, we will always
462                  *       call it and not the others for that team
463                  *       member.
464                  */
465 
466                 /* We cannot assume that SIOCGMIIPHY will also read a
467                  * register; not all network drivers (e.g., e100)
468                  * support that.
469                  */
470 
471                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
473                 mii = if_mii(&ifr);
474                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475                         mii->reg_num = MII_BMSR;
476                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
477                                 return mii->val_out & BMSR_LSTATUS;
478                 }
479         }
480 
481         /* If reporting, report that either there's no dev->do_ioctl,
482          * or both SIOCGMIIREG and get_link failed (meaning that we
483          * cannot report link status).  If not reporting, pretend
484          * we're ok.
485          */
486         return reporting ? -1 : BMSR_LSTATUS;
487 }
488 
489 /*----------------------------- Multicast list ------------------------------*/
490 
491 /* Push the promiscuity flag down to appropriate slaves */
492 static int bond_set_promiscuity(struct bonding *bond, int inc)
493 {
494         struct list_head *iter;
495         int err = 0;
496 
497         if (bond_uses_primary(bond)) {
498                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
499 
500                 if (curr_active)
501                         err = dev_set_promiscuity(curr_active->dev, inc);
502         } else {
503                 struct slave *slave;
504 
505                 bond_for_each_slave(bond, slave, iter) {
506                         err = dev_set_promiscuity(slave->dev, inc);
507                         if (err)
508                                 return err;
509                 }
510         }
511         return err;
512 }
513 
514 /* Push the allmulti flag down to all slaves */
515 static int bond_set_allmulti(struct bonding *bond, int inc)
516 {
517         struct list_head *iter;
518         int err = 0;
519 
520         if (bond_uses_primary(bond)) {
521                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
522 
523                 if (curr_active)
524                         err = dev_set_allmulti(curr_active->dev, inc);
525         } else {
526                 struct slave *slave;
527 
528                 bond_for_each_slave(bond, slave, iter) {
529                         err = dev_set_allmulti(slave->dev, inc);
530                         if (err)
531                                 return err;
532                 }
533         }
534         return err;
535 }
536 
537 /* Retrieve the list of registered multicast addresses for the bonding
538  * device and retransmit an IGMP JOIN request to the current active
539  * slave.
540  */
541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
542 {
543         struct bonding *bond = container_of(work, struct bonding,
544                                             mcast_work.work);
545 
546         if (!rtnl_trylock()) {
547                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
548                 return;
549         }
550         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
551 
552         if (bond->igmp_retrans > 1) {
553                 bond->igmp_retrans--;
554                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
555         }
556         rtnl_unlock();
557 }
558 
559 /* Flush bond's hardware addresses from slave */
560 static void bond_hw_addr_flush(struct net_device *bond_dev,
561                                struct net_device *slave_dev)
562 {
563         struct bonding *bond = netdev_priv(bond_dev);
564 
565         dev_uc_unsync(slave_dev, bond_dev);
566         dev_mc_unsync(slave_dev, bond_dev);
567 
568         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
569                 /* del lacpdu mc addr from mc list */
570                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
571 
572                 dev_mc_del(slave_dev, lacpdu_multicast);
573         }
574 }
575 
576 /*--------------------------- Active slave change ---------------------------*/
577 
578 /* Update the hardware address list and promisc/allmulti for the new and
579  * old active slaves (if any).  Modes that are not using primary keep all
580  * slaves up date at all times; only the modes that use primary need to call
581  * this function to swap these settings during a failover.
582  */
583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
584                               struct slave *old_active)
585 {
586         if (old_active) {
587                 if (bond->dev->flags & IFF_PROMISC)
588                         dev_set_promiscuity(old_active->dev, -1);
589 
590                 if (bond->dev->flags & IFF_ALLMULTI)
591                         dev_set_allmulti(old_active->dev, -1);
592 
593                 bond_hw_addr_flush(bond->dev, old_active->dev);
594         }
595 
596         if (new_active) {
597                 /* FIXME: Signal errors upstream. */
598                 if (bond->dev->flags & IFF_PROMISC)
599                         dev_set_promiscuity(new_active->dev, 1);
600 
601                 if (bond->dev->flags & IFF_ALLMULTI)
602                         dev_set_allmulti(new_active->dev, 1);
603 
604                 netif_addr_lock_bh(bond->dev);
605                 dev_uc_sync(new_active->dev, bond->dev);
606                 dev_mc_sync(new_active->dev, bond->dev);
607                 netif_addr_unlock_bh(bond->dev);
608         }
609 }
610 
611 /**
612  * bond_set_dev_addr - clone slave's address to bond
613  * @bond_dev: bond net device
614  * @slave_dev: slave net device
615  *
616  * Should be called with RTNL held.
617  */
618 static void bond_set_dev_addr(struct net_device *bond_dev,
619                               struct net_device *slave_dev)
620 {
621         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
622                    bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
623         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
624         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
625         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
626 }
627 
628 static struct slave *bond_get_old_active(struct bonding *bond,
629                                          struct slave *new_active)
630 {
631         struct slave *slave;
632         struct list_head *iter;
633 
634         bond_for_each_slave(bond, slave, iter) {
635                 if (slave == new_active)
636                         continue;
637 
638                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
639                         return slave;
640         }
641 
642         return NULL;
643 }
644 
645 /* bond_do_fail_over_mac
646  *
647  * Perform special MAC address swapping for fail_over_mac settings
648  *
649  * Called with RTNL
650  */
651 static void bond_do_fail_over_mac(struct bonding *bond,
652                                   struct slave *new_active,
653                                   struct slave *old_active)
654 {
655         u8 tmp_mac[ETH_ALEN];
656         struct sockaddr saddr;
657         int rv;
658 
659         switch (bond->params.fail_over_mac) {
660         case BOND_FOM_ACTIVE:
661                 if (new_active)
662                         bond_set_dev_addr(bond->dev, new_active->dev);
663                 break;
664         case BOND_FOM_FOLLOW:
665                 /* if new_active && old_active, swap them
666                  * if just old_active, do nothing (going to no active slave)
667                  * if just new_active, set new_active to bond's MAC
668                  */
669                 if (!new_active)
670                         return;
671 
672                 if (!old_active)
673                         old_active = bond_get_old_active(bond, new_active);
674 
675                 if (old_active) {
676                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677                         ether_addr_copy(saddr.sa_data,
678                                         old_active->dev->dev_addr);
679                         saddr.sa_family = new_active->dev->type;
680                 } else {
681                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682                         saddr.sa_family = bond->dev->type;
683                 }
684 
685                 rv = dev_set_mac_address(new_active->dev, &saddr);
686                 if (rv) {
687                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
688                                    -rv, new_active->dev->name);
689                         goto out;
690                 }
691 
692                 if (!old_active)
693                         goto out;
694 
695                 ether_addr_copy(saddr.sa_data, tmp_mac);
696                 saddr.sa_family = old_active->dev->type;
697 
698                 rv = dev_set_mac_address(old_active->dev, &saddr);
699                 if (rv)
700                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
701                                    -rv, new_active->dev->name);
702 out:
703                 break;
704         default:
705                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
706                            bond->params.fail_over_mac);
707                 break;
708         }
709 
710 }
711 
712 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
713 {
714         struct slave *prim = rtnl_dereference(bond->primary_slave);
715         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
716 
717         if (!prim || prim->link != BOND_LINK_UP) {
718                 if (!curr || curr->link != BOND_LINK_UP)
719                         return NULL;
720                 return curr;
721         }
722 
723         if (bond->force_primary) {
724                 bond->force_primary = false;
725                 return prim;
726         }
727 
728         if (!curr || curr->link != BOND_LINK_UP)
729                 return prim;
730 
731         /* At this point, prim and curr are both up */
732         switch (bond->params.primary_reselect) {
733         case BOND_PRI_RESELECT_ALWAYS:
734                 return prim;
735         case BOND_PRI_RESELECT_BETTER:
736                 if (prim->speed < curr->speed)
737                         return curr;
738                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
739                         return curr;
740                 return prim;
741         case BOND_PRI_RESELECT_FAILURE:
742                 return curr;
743         default:
744                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
745                            bond->params.primary_reselect);
746                 return curr;
747         }
748 }
749 
750 /**
751  * bond_find_best_slave - select the best available slave to be the active one
752  * @bond: our bonding struct
753  */
754 static struct slave *bond_find_best_slave(struct bonding *bond)
755 {
756         struct slave *slave, *bestslave = NULL;
757         struct list_head *iter;
758         int mintime = bond->params.updelay;
759 
760         slave = bond_choose_primary_or_current(bond);
761         if (slave)
762                 return slave;
763 
764         bond_for_each_slave(bond, slave, iter) {
765                 if (slave->link == BOND_LINK_UP)
766                         return slave;
767                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
768                     slave->delay < mintime) {
769                         mintime = slave->delay;
770                         bestslave = slave;
771                 }
772         }
773 
774         return bestslave;
775 }
776 
777 static bool bond_should_notify_peers(struct bonding *bond)
778 {
779         struct slave *slave;
780 
781         rcu_read_lock();
782         slave = rcu_dereference(bond->curr_active_slave);
783         rcu_read_unlock();
784 
785         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
786                    slave ? slave->dev->name : "NULL");
787 
788         if (!slave || !bond->send_peer_notif ||
789             !netif_carrier_ok(bond->dev) ||
790             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
791                 return false;
792 
793         return true;
794 }
795 
796 /**
797  * change_active_interface - change the active slave into the specified one
798  * @bond: our bonding struct
799  * @new: the new slave to make the active one
800  *
801  * Set the new slave to the bond's settings and unset them on the old
802  * curr_active_slave.
803  * Setting include flags, mc-list, promiscuity, allmulti, etc.
804  *
805  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
806  * because it is apparently the best available slave we have, even though its
807  * updelay hasn't timed out yet.
808  *
809  * Caller must hold RTNL.
810  */
811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
812 {
813         struct slave *old_active;
814 
815         ASSERT_RTNL();
816 
817         old_active = rtnl_dereference(bond->curr_active_slave);
818 
819         if (old_active == new_active)
820                 return;
821 
822         if (new_active) {
823                 new_active->last_link_up = jiffies;
824 
825                 if (new_active->link == BOND_LINK_BACK) {
826                         if (bond_uses_primary(bond)) {
827                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
828                                             new_active->dev->name,
829                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
830                         }
831 
832                         new_active->delay = 0;
833                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
834                                                   BOND_SLAVE_NOTIFY_NOW);
835 
836                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
837                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
838 
839                         if (bond_is_lb(bond))
840                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
841                 } else {
842                         if (bond_uses_primary(bond)) {
843                                 netdev_info(bond->dev, "making interface %s the new active one\n",
844                                             new_active->dev->name);
845                         }
846                 }
847         }
848 
849         if (bond_uses_primary(bond))
850                 bond_hw_addr_swap(bond, new_active, old_active);
851 
852         if (bond_is_lb(bond)) {
853                 bond_alb_handle_active_change(bond, new_active);
854                 if (old_active)
855                         bond_set_slave_inactive_flags(old_active,
856                                                       BOND_SLAVE_NOTIFY_NOW);
857                 if (new_active)
858                         bond_set_slave_active_flags(new_active,
859                                                     BOND_SLAVE_NOTIFY_NOW);
860         } else {
861                 rcu_assign_pointer(bond->curr_active_slave, new_active);
862         }
863 
864         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
865                 if (old_active)
866                         bond_set_slave_inactive_flags(old_active,
867                                                       BOND_SLAVE_NOTIFY_NOW);
868 
869                 if (new_active) {
870                         bool should_notify_peers = false;
871 
872                         bond_set_slave_active_flags(new_active,
873                                                     BOND_SLAVE_NOTIFY_NOW);
874 
875                         if (bond->params.fail_over_mac)
876                                 bond_do_fail_over_mac(bond, new_active,
877                                                       old_active);
878 
879                         if (netif_running(bond->dev)) {
880                                 bond->send_peer_notif =
881                                         bond->params.num_peer_notif;
882                                 should_notify_peers =
883                                         bond_should_notify_peers(bond);
884                         }
885 
886                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
887                         if (should_notify_peers)
888                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
889                                                          bond->dev);
890                 }
891         }
892 
893         /* resend IGMP joins since active slave has changed or
894          * all were sent on curr_active_slave.
895          * resend only if bond is brought up with the affected
896          * bonding modes and the retransmission is enabled
897          */
898         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
899             ((bond_uses_primary(bond) && new_active) ||
900              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
901                 bond->igmp_retrans = bond->params.resend_igmp;
902                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
903         }
904 }
905 
906 /**
907  * bond_select_active_slave - select a new active slave, if needed
908  * @bond: our bonding struct
909  *
910  * This functions should be called when one of the following occurs:
911  * - The old curr_active_slave has been released or lost its link.
912  * - The primary_slave has got its link back.
913  * - A slave has got its link back and there's no old curr_active_slave.
914  *
915  * Caller must hold RTNL.
916  */
917 void bond_select_active_slave(struct bonding *bond)
918 {
919         struct slave *best_slave;
920         int rv;
921 
922         ASSERT_RTNL();
923 
924         best_slave = bond_find_best_slave(bond);
925         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
926                 bond_change_active_slave(bond, best_slave);
927                 rv = bond_set_carrier(bond);
928                 if (!rv)
929                         return;
930 
931                 if (netif_carrier_ok(bond->dev))
932                         netdev_info(bond->dev, "first active interface up!\n");
933                 else
934                         netdev_info(bond->dev, "now running without any active interface!\n");
935         }
936 }
937 
938 #ifdef CONFIG_NET_POLL_CONTROLLER
939 static inline int slave_enable_netpoll(struct slave *slave)
940 {
941         struct netpoll *np;
942         int err = 0;
943 
944         np = kzalloc(sizeof(*np), GFP_KERNEL);
945         err = -ENOMEM;
946         if (!np)
947                 goto out;
948 
949         err = __netpoll_setup(np, slave->dev);
950         if (err) {
951                 kfree(np);
952                 goto out;
953         }
954         slave->np = np;
955 out:
956         return err;
957 }
958 static inline void slave_disable_netpoll(struct slave *slave)
959 {
960         struct netpoll *np = slave->np;
961 
962         if (!np)
963                 return;
964 
965         slave->np = NULL;
966         __netpoll_free_async(np);
967 }
968 
969 static void bond_poll_controller(struct net_device *bond_dev)
970 {
971         struct bonding *bond = netdev_priv(bond_dev);
972         struct slave *slave = NULL;
973         struct list_head *iter;
974         struct ad_info ad_info;
975         struct netpoll_info *ni;
976         const struct net_device_ops *ops;
977 
978         if (BOND_MODE(bond) == BOND_MODE_8023AD)
979                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
980                         return;
981 
982         bond_for_each_slave_rcu(bond, slave, iter) {
983                 ops = slave->dev->netdev_ops;
984                 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
985                         continue;
986 
987                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
988                         struct aggregator *agg =
989                             SLAVE_AD_INFO(slave)->port.aggregator;
990 
991                         if (agg &&
992                             agg->aggregator_identifier != ad_info.aggregator_id)
993                                 continue;
994                 }
995 
996                 ni = rcu_dereference_bh(slave->dev->npinfo);
997                 if (down_trylock(&ni->dev_lock))
998                         continue;
999                 ops->ndo_poll_controller(slave->dev);
1000                 up(&ni->dev_lock);
1001         }
1002 }
1003 
1004 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1005 {
1006         struct bonding *bond = netdev_priv(bond_dev);
1007         struct list_head *iter;
1008         struct slave *slave;
1009 
1010         bond_for_each_slave(bond, slave, iter)
1011                 if (bond_slave_is_up(slave))
1012                         slave_disable_netpoll(slave);
1013 }
1014 
1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1016 {
1017         struct bonding *bond = netdev_priv(dev);
1018         struct list_head *iter;
1019         struct slave *slave;
1020         int err = 0;
1021 
1022         bond_for_each_slave(bond, slave, iter) {
1023                 err = slave_enable_netpoll(slave);
1024                 if (err) {
1025                         bond_netpoll_cleanup(dev);
1026                         break;
1027                 }
1028         }
1029         return err;
1030 }
1031 #else
1032 static inline int slave_enable_netpoll(struct slave *slave)
1033 {
1034         return 0;
1035 }
1036 static inline void slave_disable_netpoll(struct slave *slave)
1037 {
1038 }
1039 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1040 {
1041 }
1042 #endif
1043 
1044 /*---------------------------------- IOCTL ----------------------------------*/
1045 
1046 static netdev_features_t bond_fix_features(struct net_device *dev,
1047                                            netdev_features_t features)
1048 {
1049         struct bonding *bond = netdev_priv(dev);
1050         struct list_head *iter;
1051         netdev_features_t mask;
1052         struct slave *slave;
1053 
1054         mask = features;
1055 
1056         features &= ~NETIF_F_ONE_FOR_ALL;
1057         features |= NETIF_F_ALL_FOR_ALL;
1058 
1059         bond_for_each_slave(bond, slave, iter) {
1060                 features = netdev_increment_features(features,
1061                                                      slave->dev->features,
1062                                                      mask);
1063         }
1064         features = netdev_add_tso_features(features, mask);
1065 
1066         return features;
1067 }
1068 
1069 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1070                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1071                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1072 
1073 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1075 
1076 static void bond_compute_features(struct bonding *bond)
1077 {
1078         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1079                                         IFF_XMIT_DST_RELEASE_PERM;
1080         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1081         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1082         struct net_device *bond_dev = bond->dev;
1083         struct list_head *iter;
1084         struct slave *slave;
1085         unsigned short max_hard_header_len = ETH_HLEN;
1086         unsigned int gso_max_size = GSO_MAX_SIZE;
1087         u16 gso_max_segs = GSO_MAX_SEGS;
1088 
1089         if (!bond_has_slaves(bond))
1090                 goto done;
1091         vlan_features &= NETIF_F_ALL_FOR_ALL;
1092 
1093         bond_for_each_slave(bond, slave, iter) {
1094                 vlan_features = netdev_increment_features(vlan_features,
1095                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1096 
1097                 enc_features = netdev_increment_features(enc_features,
1098                                                          slave->dev->hw_enc_features,
1099                                                          BOND_ENC_FEATURES);
1100                 dst_release_flag &= slave->dev->priv_flags;
1101                 if (slave->dev->hard_header_len > max_hard_header_len)
1102                         max_hard_header_len = slave->dev->hard_header_len;
1103 
1104                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1105                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1106         }
1107 
1108 done:
1109         bond_dev->vlan_features = vlan_features;
1110         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1111         bond_dev->hard_header_len = max_hard_header_len;
1112         bond_dev->gso_max_segs = gso_max_segs;
1113         netif_set_gso_max_size(bond_dev, gso_max_size);
1114 
1115         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1116         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1117             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1118                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1119 
1120         netdev_change_features(bond_dev);
1121 }
1122 
1123 static void bond_setup_by_slave(struct net_device *bond_dev,
1124                                 struct net_device *slave_dev)
1125 {
1126         bond_dev->header_ops        = slave_dev->header_ops;
1127 
1128         bond_dev->type              = slave_dev->type;
1129         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1130         bond_dev->addr_len          = slave_dev->addr_len;
1131 
1132         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1133                 slave_dev->addr_len);
1134 }
1135 
1136 /* On bonding slaves other than the currently active slave, suppress
1137  * duplicates except for alb non-mcast/bcast.
1138  */
1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1140                                             struct slave *slave,
1141                                             struct bonding *bond)
1142 {
1143         if (bond_is_slave_inactive(slave)) {
1144                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1145                     skb->pkt_type != PACKET_BROADCAST &&
1146                     skb->pkt_type != PACKET_MULTICAST)
1147                         return false;
1148                 return true;
1149         }
1150         return false;
1151 }
1152 
1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1154 {
1155         struct sk_buff *skb = *pskb;
1156         struct slave *slave;
1157         struct bonding *bond;
1158         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1159                           struct slave *);
1160         int ret = RX_HANDLER_ANOTHER;
1161 
1162         skb = skb_share_check(skb, GFP_ATOMIC);
1163         if (unlikely(!skb))
1164                 return RX_HANDLER_CONSUMED;
1165 
1166         *pskb = skb;
1167 
1168         slave = bond_slave_get_rcu(skb->dev);
1169         bond = slave->bond;
1170 
1171         recv_probe = ACCESS_ONCE(bond->recv_probe);
1172         if (recv_probe) {
1173                 ret = recv_probe(skb, bond, slave);
1174                 if (ret == RX_HANDLER_CONSUMED) {
1175                         consume_skb(skb);
1176                         return ret;
1177                 }
1178         }
1179 
1180         if (bond_should_deliver_exact_match(skb, slave, bond))
1181                 return RX_HANDLER_EXACT;
1182 
1183         skb->dev = bond->dev;
1184 
1185         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1186             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1187             skb->pkt_type == PACKET_HOST) {
1188 
1189                 if (unlikely(skb_cow_head(skb,
1190                                           skb->data - skb_mac_header(skb)))) {
1191                         kfree_skb(skb);
1192                         return RX_HANDLER_CONSUMED;
1193                 }
1194                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1195         }
1196 
1197         return ret;
1198 }
1199 
1200 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1201 {
1202         switch (BOND_MODE(bond)) {
1203         case BOND_MODE_ROUNDROBIN:
1204                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1205         case BOND_MODE_ACTIVEBACKUP:
1206                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1207         case BOND_MODE_BROADCAST:
1208                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1209         case BOND_MODE_XOR:
1210         case BOND_MODE_8023AD:
1211                 return NETDEV_LAG_TX_TYPE_HASH;
1212         default:
1213                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1214         }
1215 }
1216 
1217 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1218 {
1219         struct netdev_lag_upper_info lag_upper_info;
1220         int err;
1221 
1222         lag_upper_info.tx_type = bond_lag_tx_type(bond);
1223         err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1224                                            &lag_upper_info);
1225         if (err)
1226                 return err;
1227         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1228         return 0;
1229 }
1230 
1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1232 {
1233         netdev_upper_dev_unlink(slave->dev, bond->dev);
1234         slave->dev->flags &= ~IFF_SLAVE;
1235         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1236 }
1237 
1238 static struct slave *bond_alloc_slave(struct bonding *bond)
1239 {
1240         struct slave *slave = NULL;
1241 
1242         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1243         if (!slave)
1244                 return NULL;
1245 
1246         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1247                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1248                                                GFP_KERNEL);
1249                 if (!SLAVE_AD_INFO(slave)) {
1250                         kfree(slave);
1251                         return NULL;
1252                 }
1253         }
1254         return slave;
1255 }
1256 
1257 static void bond_free_slave(struct slave *slave)
1258 {
1259         struct bonding *bond = bond_get_bond_by_slave(slave);
1260 
1261         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1262                 kfree(SLAVE_AD_INFO(slave));
1263 
1264         kfree(slave);
1265 }
1266 
1267 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1268 {
1269         info->bond_mode = BOND_MODE(bond);
1270         info->miimon = bond->params.miimon;
1271         info->num_slaves = bond->slave_cnt;
1272 }
1273 
1274 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1275 {
1276         strcpy(info->slave_name, slave->dev->name);
1277         info->link = slave->link;
1278         info->state = bond_slave_state(slave);
1279         info->link_failure_count = slave->link_failure_count;
1280 }
1281 
1282 static void bond_netdev_notify(struct net_device *dev,
1283                                struct netdev_bonding_info *info)
1284 {
1285         rtnl_lock();
1286         netdev_bonding_info_change(dev, info);
1287         rtnl_unlock();
1288 }
1289 
1290 static void bond_netdev_notify_work(struct work_struct *_work)
1291 {
1292         struct netdev_notify_work *w =
1293                 container_of(_work, struct netdev_notify_work, work.work);
1294 
1295         bond_netdev_notify(w->dev, &w->bonding_info);
1296         dev_put(w->dev);
1297         kfree(w);
1298 }
1299 
1300 void bond_queue_slave_event(struct slave *slave)
1301 {
1302         struct bonding *bond = slave->bond;
1303         struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1304 
1305         if (!nnw)
1306                 return;
1307 
1308         dev_hold(slave->dev);
1309         nnw->dev = slave->dev;
1310         bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1311         bond_fill_ifbond(bond, &nnw->bonding_info.master);
1312         INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1313 
1314         queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1315 }
1316 
1317 void bond_lower_state_changed(struct slave *slave)
1318 {
1319         struct netdev_lag_lower_state_info info;
1320 
1321         info.link_up = slave->link == BOND_LINK_UP ||
1322                        slave->link == BOND_LINK_FAIL;
1323         info.tx_enabled = bond_is_active_slave(slave);
1324         netdev_lower_state_changed(slave->dev, &info);
1325 }
1326 
1327 /* enslave device <slave> to bond device <master> */
1328 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1329 {
1330         struct bonding *bond = netdev_priv(bond_dev);
1331         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1332         struct slave *new_slave = NULL, *prev_slave;
1333         struct sockaddr addr;
1334         int link_reporting;
1335         int res = 0, i;
1336 
1337         if (!bond->params.use_carrier &&
1338             slave_dev->ethtool_ops->get_link == NULL &&
1339             slave_ops->ndo_do_ioctl == NULL) {
1340                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1341                             slave_dev->name);
1342         }
1343 
1344         /* already enslaved */
1345         if (slave_dev->flags & IFF_SLAVE) {
1346                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1347                 return -EBUSY;
1348         }
1349 
1350         if (bond_dev == slave_dev) {
1351                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1352                 return -EPERM;
1353         }
1354 
1355         /* vlan challenged mutual exclusion */
1356         /* no need to lock since we're protected by rtnl_lock */
1357         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1358                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1359                            slave_dev->name);
1360                 if (vlan_uses_dev(bond_dev)) {
1361                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1362                                    slave_dev->name, bond_dev->name);
1363                         return -EPERM;
1364                 } else {
1365                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1366                                     slave_dev->name, slave_dev->name,
1367                                     bond_dev->name);
1368                 }
1369         } else {
1370                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1371                            slave_dev->name);
1372         }
1373 
1374         /* Old ifenslave binaries are no longer supported.  These can
1375          * be identified with moderate accuracy by the state of the slave:
1376          * the current ifenslave will set the interface down prior to
1377          * enslaving it; the old ifenslave will not.
1378          */
1379         if (slave_dev->flags & IFF_UP) {
1380                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1381                            slave_dev->name);
1382                 return -EPERM;
1383         }
1384 
1385         /* set bonding device ether type by slave - bonding netdevices are
1386          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1387          * there is a need to override some of the type dependent attribs/funcs.
1388          *
1389          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1390          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1391          */
1392         if (!bond_has_slaves(bond)) {
1393                 if (bond_dev->type != slave_dev->type) {
1394                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1395                                    bond_dev->type, slave_dev->type);
1396 
1397                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1398                                                        bond_dev);
1399                         res = notifier_to_errno(res);
1400                         if (res) {
1401                                 netdev_err(bond_dev, "refused to change device type\n");
1402                                 return -EBUSY;
1403                         }
1404 
1405                         /* Flush unicast and multicast addresses */
1406                         dev_uc_flush(bond_dev);
1407                         dev_mc_flush(bond_dev);
1408 
1409                         if (slave_dev->type != ARPHRD_ETHER)
1410                                 bond_setup_by_slave(bond_dev, slave_dev);
1411                         else {
1412                                 ether_setup(bond_dev);
1413                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1414                         }
1415 
1416                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1417                                                  bond_dev);
1418                 }
1419         } else if (bond_dev->type != slave_dev->type) {
1420                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1421                            slave_dev->name, slave_dev->type, bond_dev->type);
1422                 return -EINVAL;
1423         }
1424 
1425         if (slave_ops->ndo_set_mac_address == NULL) {
1426                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1427                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1428                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1429                         if (!bond_has_slaves(bond)) {
1430                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1431                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1432                         } else {
1433                                 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1434                                 res = -EOPNOTSUPP;
1435                                 goto err_undo_flags;
1436                         }
1437                 }
1438         }
1439 
1440         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1441 
1442         /* If this is the first slave, then we need to set the master's hardware
1443          * address to be the same as the slave's.
1444          */
1445         if (!bond_has_slaves(bond) &&
1446             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1447                 bond_set_dev_addr(bond->dev, slave_dev);
1448 
1449         new_slave = bond_alloc_slave(bond);
1450         if (!new_slave) {
1451                 res = -ENOMEM;
1452                 goto err_undo_flags;
1453         }
1454 
1455         new_slave->bond = bond;
1456         new_slave->dev = slave_dev;
1457         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1458          * is set via sysfs or module option if desired.
1459          */
1460         new_slave->queue_id = 0;
1461 
1462         /* Save slave's original mtu and then set it to match the bond */
1463         new_slave->original_mtu = slave_dev->mtu;
1464         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1465         if (res) {
1466                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1467                 goto err_free;
1468         }
1469 
1470         /* Save slave's original ("permanent") mac address for modes
1471          * that need it, and for restoring it upon release, and then
1472          * set it to the master's address
1473          */
1474         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1475 
1476         if (!bond->params.fail_over_mac ||
1477             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1478                 /* Set slave to master's mac address.  The application already
1479                  * set the master's mac address to that of the first slave
1480                  */
1481                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1482                 addr.sa_family = slave_dev->type;
1483                 res = dev_set_mac_address(slave_dev, &addr);
1484                 if (res) {
1485                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1486                         goto err_restore_mtu;
1487                 }
1488         }
1489 
1490         /* set slave flag before open to prevent IPv6 addrconf */
1491         slave_dev->flags |= IFF_SLAVE;
1492 
1493         /* open the slave since the application closed it */
1494         res = dev_open(slave_dev);
1495         if (res) {
1496                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1497                 goto err_restore_mac;
1498         }
1499 
1500         slave_dev->priv_flags |= IFF_BONDING;
1501         /* initialize slave stats */
1502         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1503 
1504         if (bond_is_lb(bond)) {
1505                 /* bond_alb_init_slave() must be called before all other stages since
1506                  * it might fail and we do not want to have to undo everything
1507                  */
1508                 res = bond_alb_init_slave(bond, new_slave);
1509                 if (res)
1510                         goto err_close;
1511         }
1512 
1513         /* If the mode uses primary, then the following is handled by
1514          * bond_change_active_slave().
1515          */
1516         if (!bond_uses_primary(bond)) {
1517                 /* set promiscuity level to new slave */
1518                 if (bond_dev->flags & IFF_PROMISC) {
1519                         res = dev_set_promiscuity(slave_dev, 1);
1520                         if (res)
1521                                 goto err_close;
1522                 }
1523 
1524                 /* set allmulti level to new slave */
1525                 if (bond_dev->flags & IFF_ALLMULTI) {
1526                         res = dev_set_allmulti(slave_dev, 1);
1527                         if (res)
1528                                 goto err_close;
1529                 }
1530 
1531                 netif_addr_lock_bh(bond_dev);
1532 
1533                 dev_mc_sync_multiple(slave_dev, bond_dev);
1534                 dev_uc_sync_multiple(slave_dev, bond_dev);
1535 
1536                 netif_addr_unlock_bh(bond_dev);
1537         }
1538 
1539         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1540                 /* add lacpdu mc addr to mc list */
1541                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1542 
1543                 dev_mc_add(slave_dev, lacpdu_multicast);
1544         }
1545 
1546         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1547         if (res) {
1548                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1549                            slave_dev->name);
1550                 goto err_close;
1551         }
1552 
1553         prev_slave = bond_last_slave(bond);
1554 
1555         new_slave->delay = 0;
1556         new_slave->link_failure_count = 0;
1557 
1558         bond_update_speed_duplex(new_slave);
1559 
1560         new_slave->last_rx = jiffies -
1561                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1562         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1563                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1564 
1565         if (bond->params.miimon && !bond->params.use_carrier) {
1566                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1567 
1568                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1569                         /* miimon is set but a bonded network driver
1570                          * does not support ETHTOOL/MII and
1571                          * arp_interval is not set.  Note: if
1572                          * use_carrier is enabled, we will never go
1573                          * here (because netif_carrier is always
1574                          * supported); thus, we don't need to change
1575                          * the messages for netif_carrier.
1576                          */
1577                         netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1578                                     slave_dev->name);
1579                 } else if (link_reporting == -1) {
1580                         /* unable get link status using mii/ethtool */
1581                         netdev_warn(bond_dev, "can't get link status from interface %s; 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",
1582                                     slave_dev->name);
1583                 }
1584         }
1585 
1586         /* check for initial state */
1587         if (bond->params.miimon) {
1588                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1589                         if (bond->params.updelay) {
1590                                 bond_set_slave_link_state(new_slave,
1591                                                           BOND_LINK_BACK,
1592                                                           BOND_SLAVE_NOTIFY_NOW);
1593                                 new_slave->delay = bond->params.updelay;
1594                         } else {
1595                                 bond_set_slave_link_state(new_slave,
1596                                                           BOND_LINK_UP,
1597                                                           BOND_SLAVE_NOTIFY_NOW);
1598                         }
1599                 } else {
1600                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1601                                                   BOND_SLAVE_NOTIFY_NOW);
1602                 }
1603         } else if (bond->params.arp_interval) {
1604                 bond_set_slave_link_state(new_slave,
1605                                           (netif_carrier_ok(slave_dev) ?
1606                                           BOND_LINK_UP : BOND_LINK_DOWN),
1607                                           BOND_SLAVE_NOTIFY_NOW);
1608         } else {
1609                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1610                                           BOND_SLAVE_NOTIFY_NOW);
1611         }
1612 
1613         if (new_slave->link != BOND_LINK_DOWN)
1614                 new_slave->last_link_up = jiffies;
1615         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1616                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1617                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1618 
1619         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1620                 /* if there is a primary slave, remember it */
1621                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1622                         rcu_assign_pointer(bond->primary_slave, new_slave);
1623                         bond->force_primary = true;
1624                 }
1625         }
1626 
1627         switch (BOND_MODE(bond)) {
1628         case BOND_MODE_ACTIVEBACKUP:
1629                 bond_set_slave_inactive_flags(new_slave,
1630                                               BOND_SLAVE_NOTIFY_NOW);
1631                 break;
1632         case BOND_MODE_8023AD:
1633                 /* in 802.3ad mode, the internal mechanism
1634                  * will activate the slaves in the selected
1635                  * aggregator
1636                  */
1637                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1638                 /* if this is the first slave */
1639                 if (!prev_slave) {
1640                         SLAVE_AD_INFO(new_slave)->id = 1;
1641                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1642                          * can be called only after the mac address of the bond is set
1643                          */
1644                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1645                 } else {
1646                         SLAVE_AD_INFO(new_slave)->id =
1647                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1648                 }
1649 
1650                 bond_3ad_bind_slave(new_slave);
1651                 break;
1652         case BOND_MODE_TLB:
1653         case BOND_MODE_ALB:
1654                 bond_set_active_slave(new_slave);
1655                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1656                 break;
1657         default:
1658                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1659 
1660                 /* always active in trunk mode */
1661                 bond_set_active_slave(new_slave);
1662 
1663                 /* In trunking mode there is little meaning to curr_active_slave
1664                  * anyway (it holds no special properties of the bond device),
1665                  * so we can change it without calling change_active_interface()
1666                  */
1667                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1668                     new_slave->link == BOND_LINK_UP)
1669                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1670 
1671                 break;
1672         } /* switch(bond_mode) */
1673 
1674 #ifdef CONFIG_NET_POLL_CONTROLLER
1675         slave_dev->npinfo = bond->dev->npinfo;
1676         if (slave_dev->npinfo) {
1677                 if (slave_enable_netpoll(new_slave)) {
1678                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1679                         res = -EBUSY;
1680                         goto err_detach;
1681                 }
1682         }
1683 #endif
1684 
1685         if (!(bond_dev->features & NETIF_F_LRO))
1686                 dev_disable_lro(slave_dev);
1687 
1688         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1689                                          new_slave);
1690         if (res) {
1691                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1692                 goto err_detach;
1693         }
1694 
1695         res = bond_master_upper_dev_link(bond, new_slave);
1696         if (res) {
1697                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1698                 goto err_unregister;
1699         }
1700 
1701         res = bond_sysfs_slave_add(new_slave);
1702         if (res) {
1703                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1704                 goto err_upper_unlink;
1705         }
1706 
1707         bond->slave_cnt++;
1708         bond_compute_features(bond);
1709         bond_set_carrier(bond);
1710 
1711         if (bond_uses_primary(bond)) {
1712                 block_netpoll_tx();
1713                 bond_select_active_slave(bond);
1714                 unblock_netpoll_tx();
1715         }
1716 
1717         if (bond_mode_uses_xmit_hash(bond))
1718                 bond_update_slave_arr(bond, NULL);
1719 
1720         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1721                     slave_dev->name,
1722                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1723                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1724 
1725         /* enslave is successful */
1726         bond_queue_slave_event(new_slave);
1727         return 0;
1728 
1729 /* Undo stages on error */
1730 err_upper_unlink:
1731         bond_upper_dev_unlink(bond, new_slave);
1732 
1733 err_unregister:
1734         netdev_rx_handler_unregister(slave_dev);
1735 
1736 err_detach:
1737         if (!bond_uses_primary(bond))
1738                 bond_hw_addr_flush(bond_dev, slave_dev);
1739 
1740         vlan_vids_del_by_dev(slave_dev, bond_dev);
1741         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1742                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1743         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1744                 block_netpoll_tx();
1745                 bond_change_active_slave(bond, NULL);
1746                 bond_select_active_slave(bond);
1747                 unblock_netpoll_tx();
1748         }
1749         /* either primary_slave or curr_active_slave might've changed */
1750         synchronize_rcu();
1751         slave_disable_netpoll(new_slave);
1752 
1753 err_close:
1754         slave_dev->priv_flags &= ~IFF_BONDING;
1755         dev_close(slave_dev);
1756 
1757 err_restore_mac:
1758         slave_dev->flags &= ~IFF_SLAVE;
1759         if (!bond->params.fail_over_mac ||
1760             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1761                 /* XXX TODO - fom follow mode needs to change master's
1762                  * MAC if this slave's MAC is in use by the bond, or at
1763                  * least print a warning.
1764                  */
1765                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1766                 addr.sa_family = slave_dev->type;
1767                 dev_set_mac_address(slave_dev, &addr);
1768         }
1769 
1770 err_restore_mtu:
1771         dev_set_mtu(slave_dev, new_slave->original_mtu);
1772 
1773 err_free:
1774         bond_free_slave(new_slave);
1775 
1776 err_undo_flags:
1777         /* Enslave of first slave has failed and we need to fix master's mac */
1778         if (!bond_has_slaves(bond)) {
1779                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1780                                             slave_dev->dev_addr))
1781                         eth_hw_addr_random(bond_dev);
1782                 if (bond_dev->type != ARPHRD_ETHER) {
1783                         dev_close(bond_dev);
1784                         ether_setup(bond_dev);
1785                         bond_dev->flags |= IFF_MASTER;
1786                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1787                 }
1788         }
1789 
1790         return res;
1791 }
1792 
1793 /* Try to release the slave device <slave> from the bond device <master>
1794  * It is legal to access curr_active_slave without a lock because all the function
1795  * is RTNL-locked. If "all" is true it means that the function is being called
1796  * while destroying a bond interface and all slaves are being released.
1797  *
1798  * The rules for slave state should be:
1799  *   for Active/Backup:
1800  *     Active stays on all backups go down
1801  *   for Bonded connections:
1802  *     The first up interface should be left on and all others downed.
1803  */
1804 static int __bond_release_one(struct net_device *bond_dev,
1805                               struct net_device *slave_dev,
1806                               bool all)
1807 {
1808         struct bonding *bond = netdev_priv(bond_dev);
1809         struct slave *slave, *oldcurrent;
1810         struct sockaddr addr;
1811         int old_flags = bond_dev->flags;
1812         netdev_features_t old_features = bond_dev->features;
1813 
1814         /* slave is not a slave or master is not master of this slave */
1815         if (!(slave_dev->flags & IFF_SLAVE) ||
1816             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1817                 netdev_dbg(bond_dev, "cannot release %s\n",
1818                            slave_dev->name);
1819                 return -EINVAL;
1820         }
1821 
1822         block_netpoll_tx();
1823 
1824         slave = bond_get_slave_by_dev(bond, slave_dev);
1825         if (!slave) {
1826                 /* not a slave of this bond */
1827                 netdev_info(bond_dev, "%s not enslaved\n",
1828                             slave_dev->name);
1829                 unblock_netpoll_tx();
1830                 return -EINVAL;
1831         }
1832 
1833         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1834 
1835         bond_sysfs_slave_del(slave);
1836 
1837         /* recompute stats just before removing the slave */
1838         bond_get_stats(bond->dev, &bond->bond_stats);
1839 
1840         bond_upper_dev_unlink(bond, slave);
1841         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1842          * for this slave anymore.
1843          */
1844         netdev_rx_handler_unregister(slave_dev);
1845 
1846         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1847                 bond_3ad_unbind_slave(slave);
1848 
1849         if (bond_mode_uses_xmit_hash(bond))
1850                 bond_update_slave_arr(bond, slave);
1851 
1852         netdev_info(bond_dev, "Releasing %s interface %s\n",
1853                     bond_is_active_slave(slave) ? "active" : "backup",
1854                     slave_dev->name);
1855 
1856         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1857 
1858         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1859 
1860         if (!all && (!bond->params.fail_over_mac ||
1861                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1862                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1863                     bond_has_slaves(bond))
1864                         netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
1865                                     slave_dev->name, slave->perm_hwaddr,
1866                                     bond_dev->name, slave_dev->name);
1867         }
1868 
1869         if (rtnl_dereference(bond->primary_slave) == slave)
1870                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1871 
1872         if (oldcurrent == slave)
1873                 bond_change_active_slave(bond, NULL);
1874 
1875         if (bond_is_lb(bond)) {
1876                 /* Must be called only after the slave has been
1877                  * detached from the list and the curr_active_slave
1878                  * has been cleared (if our_slave == old_current),
1879                  * but before a new active slave is selected.
1880                  */
1881                 bond_alb_deinit_slave(bond, slave);
1882         }
1883 
1884         if (all) {
1885                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1886         } else if (oldcurrent == slave) {
1887                 /* Note that we hold RTNL over this sequence, so there
1888                  * is no concern that another slave add/remove event
1889                  * will interfere.
1890                  */
1891                 bond_select_active_slave(bond);
1892         }
1893 
1894         if (!bond_has_slaves(bond)) {
1895                 bond_set_carrier(bond);
1896                 eth_hw_addr_random(bond_dev);
1897         }
1898 
1899         unblock_netpoll_tx();
1900         synchronize_rcu();
1901         bond->slave_cnt--;
1902 
1903         if (!bond_has_slaves(bond)) {
1904                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1905                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1906         }
1907 
1908         bond_compute_features(bond);
1909         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1910             (old_features & NETIF_F_VLAN_CHALLENGED))
1911                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1912                             slave_dev->name, bond_dev->name);
1913 
1914         vlan_vids_del_by_dev(slave_dev, bond_dev);
1915 
1916         /* If the mode uses primary, then this case was handled above by
1917          * bond_change_active_slave(..., NULL)
1918          */
1919         if (!bond_uses_primary(bond)) {
1920                 /* unset promiscuity level from slave
1921                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1922                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1923                  * value of that flag before that change, as that was the value
1924                  * when this slave was attached, so we cache at the start of the
1925                  * function and use it here. Same goes for ALLMULTI below
1926                  */
1927                 if (old_flags & IFF_PROMISC)
1928                         dev_set_promiscuity(slave_dev, -1);
1929 
1930                 /* unset allmulti level from slave */
1931                 if (old_flags & IFF_ALLMULTI)
1932                         dev_set_allmulti(slave_dev, -1);
1933 
1934                 bond_hw_addr_flush(bond_dev, slave_dev);
1935         }
1936 
1937         slave_disable_netpoll(slave);
1938 
1939         /* close slave before restoring its mac address */
1940         dev_close(slave_dev);
1941 
1942         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1943             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1944                 /* restore original ("permanent") mac address */
1945                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1946                 addr.sa_family = slave_dev->type;
1947                 dev_set_mac_address(slave_dev, &addr);
1948         }
1949 
1950         dev_set_mtu(slave_dev, slave->original_mtu);
1951 
1952         slave_dev->priv_flags &= ~IFF_BONDING;
1953 
1954         bond_free_slave(slave);
1955 
1956         return 0;
1957 }
1958 
1959 /* A wrapper used because of ndo_del_link */
1960 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1961 {
1962         return __bond_release_one(bond_dev, slave_dev, false);
1963 }
1964 
1965 /* First release a slave and then destroy the bond if no more slaves are left.
1966  * Must be under rtnl_lock when this function is called.
1967  */
1968 static int  bond_release_and_destroy(struct net_device *bond_dev,
1969                                      struct net_device *slave_dev)
1970 {
1971         struct bonding *bond = netdev_priv(bond_dev);
1972         int ret;
1973 
1974         ret = bond_release(bond_dev, slave_dev);
1975         if (ret == 0 && !bond_has_slaves(bond)) {
1976                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1977                 netdev_info(bond_dev, "Destroying bond %s\n",
1978                             bond_dev->name);
1979                 bond_remove_proc_entry(bond);
1980                 unregister_netdevice(bond_dev);
1981         }
1982         return ret;
1983 }
1984 
1985 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1986 {
1987         struct bonding *bond = netdev_priv(bond_dev);
1988         bond_fill_ifbond(bond, info);
1989         return 0;
1990 }
1991 
1992 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1993 {
1994         struct bonding *bond = netdev_priv(bond_dev);
1995         struct list_head *iter;
1996         int i = 0, res = -ENODEV;
1997         struct slave *slave;
1998 
1999         bond_for_each_slave(bond, slave, iter) {
2000                 if (i++ == (int)info->slave_id) {
2001                         res = 0;
2002                         bond_fill_ifslave(slave, info);
2003                         break;
2004                 }
2005         }
2006 
2007         return res;
2008 }
2009 
2010 /*-------------------------------- Monitoring -------------------------------*/
2011 
2012 /* called with rcu_read_lock() */
2013 static int bond_miimon_inspect(struct bonding *bond)
2014 {
2015         int link_state, commit = 0;
2016         struct list_head *iter;
2017         struct slave *slave;
2018         bool ignore_updelay;
2019 
2020         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2021 
2022         bond_for_each_slave_rcu(bond, slave, iter) {
2023                 slave->new_link = BOND_LINK_NOCHANGE;
2024 
2025                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2026 
2027                 switch (slave->link) {
2028                 case BOND_LINK_UP:
2029                         if (link_state)
2030                                 continue;
2031 
2032                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2033                                                   BOND_SLAVE_NOTIFY_LATER);
2034                         slave->delay = bond->params.downdelay;
2035                         if (slave->delay) {
2036                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2037                                             (BOND_MODE(bond) ==
2038                                              BOND_MODE_ACTIVEBACKUP) ?
2039                                              (bond_is_active_slave(slave) ?
2040                                               "active " : "backup ") : "",
2041                                             slave->dev->name,
2042                                             bond->params.downdelay * bond->params.miimon);
2043                         }
2044                         /*FALLTHRU*/
2045                 case BOND_LINK_FAIL:
2046                         if (link_state) {
2047                                 /* recovered before downdelay expired */
2048                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2049                                                           BOND_SLAVE_NOTIFY_LATER);
2050                                 slave->last_link_up = jiffies;
2051                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2052                                             (bond->params.downdelay - slave->delay) *
2053                                             bond->params.miimon,
2054                                             slave->dev->name);
2055                                 continue;
2056                         }
2057 
2058                         if (slave->delay <= 0) {
2059                                 slave->new_link = BOND_LINK_DOWN;
2060                                 commit++;
2061                                 continue;
2062                         }
2063 
2064                         slave->delay--;
2065                         break;
2066 
2067                 case BOND_LINK_DOWN:
2068                         if (!link_state)
2069                                 continue;
2070 
2071                         bond_set_slave_link_state(slave, BOND_LINK_BACK,
2072                                                   BOND_SLAVE_NOTIFY_LATER);
2073                         slave->delay = bond->params.updelay;
2074 
2075                         if (slave->delay) {
2076                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2077                                             slave->dev->name,
2078                                             ignore_updelay ? 0 :
2079                                             bond->params.updelay *
2080                                             bond->params.miimon);
2081                         }
2082                         /*FALLTHRU*/
2083                 case BOND_LINK_BACK:
2084                         if (!link_state) {
2085                                 bond_set_slave_link_state(slave,
2086                                                           BOND_LINK_DOWN,
2087                                                           BOND_SLAVE_NOTIFY_LATER);
2088                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2089                                             (bond->params.updelay - slave->delay) *
2090                                             bond->params.miimon,
2091                                             slave->dev->name);
2092 
2093                                 continue;
2094                         }
2095 
2096                         if (ignore_updelay)
2097                                 slave->delay = 0;
2098 
2099                         if (slave->delay <= 0) {
2100                                 slave->new_link = BOND_LINK_UP;
2101                                 commit++;
2102                                 ignore_updelay = false;
2103                                 continue;
2104                         }
2105 
2106                         slave->delay--;
2107                         break;
2108                 }
2109         }
2110 
2111         return commit;
2112 }
2113 
2114 static void bond_miimon_commit(struct bonding *bond)
2115 {
2116         struct list_head *iter;
2117         struct slave *slave, *primary;
2118 
2119         bond_for_each_slave(bond, slave, iter) {
2120                 switch (slave->new_link) {
2121                 case BOND_LINK_NOCHANGE:
2122                         continue;
2123 
2124                 case BOND_LINK_UP:
2125                         bond_update_speed_duplex(slave);
2126                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2127                                                   BOND_SLAVE_NOTIFY_NOW);
2128                         slave->last_link_up = jiffies;
2129 
2130                         primary = rtnl_dereference(bond->primary_slave);
2131                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2132                                 /* prevent it from being the active one */
2133                                 bond_set_backup_slave(slave);
2134                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2135                                 /* make it immediately active */
2136                                 bond_set_active_slave(slave);
2137                         } else if (slave != primary) {
2138                                 /* prevent it from being the active one */
2139                                 bond_set_backup_slave(slave);
2140                         }
2141 
2142                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2143                                     slave->dev->name,
2144                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2145                                     slave->duplex ? "full" : "half");
2146 
2147                         /* notify ad that the link status has changed */
2148                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2149                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2150 
2151                         if (bond_is_lb(bond))
2152                                 bond_alb_handle_link_change(bond, slave,
2153                                                             BOND_LINK_UP);
2154 
2155                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2156                                 bond_update_slave_arr(bond, NULL);
2157 
2158                         if (!bond->curr_active_slave || slave == primary)
2159                                 goto do_failover;
2160 
2161                         continue;
2162 
2163                 case BOND_LINK_DOWN:
2164                         if (slave->link_failure_count < UINT_MAX)
2165                                 slave->link_failure_count++;
2166 
2167                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2168                                                   BOND_SLAVE_NOTIFY_NOW);
2169 
2170                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2171                             BOND_MODE(bond) == BOND_MODE_8023AD)
2172                                 bond_set_slave_inactive_flags(slave,
2173                                                               BOND_SLAVE_NOTIFY_NOW);
2174 
2175                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2176                                     slave->dev->name);
2177 
2178                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2179                                 bond_3ad_handle_link_change(slave,
2180                                                             BOND_LINK_DOWN);
2181 
2182                         if (bond_is_lb(bond))
2183                                 bond_alb_handle_link_change(bond, slave,
2184                                                             BOND_LINK_DOWN);
2185 
2186                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2187                                 bond_update_slave_arr(bond, NULL);
2188 
2189                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2190                                 goto do_failover;
2191 
2192                         continue;
2193 
2194                 default:
2195                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2196                                    slave->new_link, slave->dev->name);
2197                         slave->new_link = BOND_LINK_NOCHANGE;
2198 
2199                         continue;
2200                 }
2201 
2202 do_failover:
2203                 block_netpoll_tx();
2204                 bond_select_active_slave(bond);
2205                 unblock_netpoll_tx();
2206         }
2207 
2208         bond_set_carrier(bond);
2209 }
2210 
2211 /* bond_mii_monitor
2212  *
2213  * Really a wrapper that splits the mii monitor into two phases: an
2214  * inspection, then (if inspection indicates something needs to be done)
2215  * an acquisition of appropriate locks followed by a commit phase to
2216  * implement whatever link state changes are indicated.
2217  */
2218 static void bond_mii_monitor(struct work_struct *work)
2219 {
2220         struct bonding *bond = container_of(work, struct bonding,
2221                                             mii_work.work);
2222         bool should_notify_peers = false;
2223         unsigned long delay;
2224 
2225         delay = msecs_to_jiffies(bond->params.miimon);
2226 
2227         if (!bond_has_slaves(bond))
2228                 goto re_arm;
2229 
2230         rcu_read_lock();
2231 
2232         should_notify_peers = bond_should_notify_peers(bond);
2233 
2234         if (bond_miimon_inspect(bond)) {
2235                 rcu_read_unlock();
2236 
2237                 /* Race avoidance with bond_close cancel of workqueue */
2238                 if (!rtnl_trylock()) {
2239                         delay = 1;
2240                         should_notify_peers = false;
2241                         goto re_arm;
2242                 }
2243 
2244                 bond_miimon_commit(bond);
2245 
2246                 rtnl_unlock();  /* might sleep, hold no other locks */
2247         } else
2248                 rcu_read_unlock();
2249 
2250 re_arm:
2251         if (bond->params.miimon)
2252                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2253 
2254         if (should_notify_peers) {
2255                 if (!rtnl_trylock())
2256                         return;
2257                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2258                 rtnl_unlock();
2259         }
2260 }
2261 
2262 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2263 {
2264         struct net_device *upper;
2265         struct list_head *iter;
2266         bool ret = false;
2267 
2268         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2269                 return true;
2270 
2271         rcu_read_lock();
2272         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2273                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2274                         ret = true;
2275                         break;
2276                 }
2277         }
2278         rcu_read_unlock();
2279 
2280         return ret;
2281 }
2282 
2283 /* We go to the (large) trouble of VLAN tagging ARP frames because
2284  * switches in VLAN mode (especially if ports are configured as
2285  * "native" to a VLAN) might not pass non-tagged frames.
2286  */
2287 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2288                           __be32 dest_ip, __be32 src_ip,
2289                           struct bond_vlan_tag *tags)
2290 {
2291         struct sk_buff *skb;
2292         struct bond_vlan_tag *outer_tag = tags;
2293 
2294         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2295                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2296 
2297         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2298                          NULL, slave_dev->dev_addr, NULL);
2299 
2300         if (!skb) {
2301                 net_err_ratelimited("ARP packet allocation failed\n");
2302                 return;
2303         }
2304 
2305         if (!tags || tags->vlan_proto == VLAN_N_VID)
2306                 goto xmit;
2307 
2308         tags++;
2309 
2310         /* Go through all the tags backwards and add them to the packet */
2311         while (tags->vlan_proto != VLAN_N_VID) {
2312                 if (!tags->vlan_id) {
2313                         tags++;
2314                         continue;
2315                 }
2316 
2317                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2318                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2319                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2320                                                 tags->vlan_id);
2321                 if (!skb) {
2322                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2323                         return;
2324                 }
2325 
2326                 tags++;
2327         }
2328         /* Set the outer tag */
2329         if (outer_tag->vlan_id) {
2330                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2331                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2332                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2333                                        outer_tag->vlan_id);
2334         }
2335 
2336 xmit:
2337         arp_xmit(skb);
2338 }
2339 
2340 /* Validate the device path between the @start_dev and the @end_dev.
2341  * The path is valid if the @end_dev is reachable through device
2342  * stacking.
2343  * When the path is validated, collect any vlan information in the
2344  * path.
2345  */
2346 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2347                                               struct net_device *end_dev,
2348                                               int level)
2349 {
2350         struct bond_vlan_tag *tags;
2351         struct net_device *upper;
2352         struct list_head  *iter;
2353 
2354         if (start_dev == end_dev) {
2355                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2356                 if (!tags)
2357                         return ERR_PTR(-ENOMEM);
2358                 tags[level].vlan_proto = VLAN_N_VID;
2359                 return tags;
2360         }
2361 
2362         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2363                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2364                 if (IS_ERR_OR_NULL(tags)) {
2365                         if (IS_ERR(tags))
2366                                 return tags;
2367                         continue;
2368                 }
2369                 if (is_vlan_dev(upper)) {
2370                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2371                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2372                 }
2373 
2374                 return tags;
2375         }
2376 
2377         return NULL;
2378 }
2379 
2380 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2381 {
2382         struct rtable *rt;
2383         struct bond_vlan_tag *tags;
2384         __be32 *targets = bond->params.arp_targets, addr;
2385         int i;
2386 
2387         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2388                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2389                 tags = NULL;
2390 
2391                 /* Find out through which dev should the packet go */
2392                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2393                                      RTO_ONLINK, 0);
2394                 if (IS_ERR(rt)) {
2395                         /* there's no route to target - try to send arp
2396                          * probe to generate any traffic (arp_validate=0)
2397                          */
2398                         if (bond->params.arp_validate)
2399                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2400                                                      bond->dev->name,
2401                                                      &targets[i]);
2402                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2403                                       0, tags);
2404                         continue;
2405                 }
2406 
2407                 /* bond device itself */
2408                 if (rt->dst.dev == bond->dev)
2409                         goto found;
2410 
2411                 rcu_read_lock();
2412                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2413                 rcu_read_unlock();
2414 
2415                 if (!IS_ERR_OR_NULL(tags))
2416                         goto found;
2417 
2418                 /* Not our device - skip */
2419                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2420                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2421 
2422                 ip_rt_put(rt);
2423                 continue;
2424 
2425 found:
2426                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2427                 ip_rt_put(rt);
2428                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2429                               addr, tags);
2430                 kfree(tags);
2431         }
2432 }
2433 
2434 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2435 {
2436         int i;
2437 
2438         if (!sip || !bond_has_this_ip(bond, tip)) {
2439                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2440                            &sip, &tip);
2441                 return;
2442         }
2443 
2444         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2445         if (i == -1) {
2446                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2447                            &sip);
2448                 return;
2449         }
2450         slave->last_rx = jiffies;
2451         slave->target_last_arp_rx[i] = jiffies;
2452 }
2453 
2454 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2455                  struct slave *slave)
2456 {
2457         struct arphdr *arp = (struct arphdr *)skb->data;
2458         struct slave *curr_active_slave, *curr_arp_slave;
2459         unsigned char *arp_ptr;
2460         __be32 sip, tip;
2461         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2462 
2463         if (!slave_do_arp_validate(bond, slave)) {
2464                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2465                     !slave_do_arp_validate_only(bond))
2466                         slave->last_rx = jiffies;
2467                 return RX_HANDLER_ANOTHER;
2468         } else if (!is_arp) {
2469                 return RX_HANDLER_ANOTHER;
2470         }
2471 
2472         alen = arp_hdr_len(bond->dev);
2473 
2474         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2475                    skb->dev->name);
2476 
2477         if (alen > skb_headlen(skb)) {
2478                 arp = kmalloc(alen, GFP_ATOMIC);
2479                 if (!arp)
2480                         goto out_unlock;
2481                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2482                         goto out_unlock;
2483         }
2484 
2485         if (arp->ar_hln != bond->dev->addr_len ||
2486             skb->pkt_type == PACKET_OTHERHOST ||
2487             skb->pkt_type == PACKET_LOOPBACK ||
2488             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2489             arp->ar_pro != htons(ETH_P_IP) ||
2490             arp->ar_pln != 4)
2491                 goto out_unlock;
2492 
2493         arp_ptr = (unsigned char *)(arp + 1);
2494         arp_ptr += bond->dev->addr_len;
2495         memcpy(&sip, arp_ptr, 4);
2496         arp_ptr += 4 + bond->dev->addr_len;
2497         memcpy(&tip, arp_ptr, 4);
2498 
2499         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2500                    slave->dev->name, bond_slave_state(slave),
2501                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2502                      &sip, &tip);
2503 
2504         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2505         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2506 
2507         /* We 'trust' the received ARP enough to validate it if:
2508          *
2509          * (a) the slave receiving the ARP is active (which includes the
2510          * current ARP slave, if any), or
2511          *
2512          * (b) the receiving slave isn't active, but there is a currently
2513          * active slave and it received valid arp reply(s) after it became
2514          * the currently active slave, or
2515          *
2516          * (c) there is an ARP slave that sent an ARP during the prior ARP
2517          * interval, and we receive an ARP reply on any slave.  We accept
2518          * these because switch FDB update delays may deliver the ARP
2519          * reply to a slave other than the sender of the ARP request.
2520          *
2521          * Note: for (b), backup slaves are receiving the broadcast ARP
2522          * request, not a reply.  This request passes from the sending
2523          * slave through the L2 switch(es) to the receiving slave.  Since
2524          * this is checking the request, sip/tip are swapped for
2525          * validation.
2526          *
2527          * This is done to avoid endless looping when we can't reach the
2528          * arp_ip_target and fool ourselves with our own arp requests.
2529          */
2530         if (bond_is_active_slave(slave))
2531                 bond_validate_arp(bond, slave, sip, tip);
2532         else if (curr_active_slave &&
2533                  time_after(slave_last_rx(bond, curr_active_slave),
2534                             curr_active_slave->last_link_up))
2535                 bond_validate_arp(bond, slave, tip, sip);
2536         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2537                  bond_time_in_interval(bond,
2538                                        dev_trans_start(curr_arp_slave->dev), 1))
2539                 bond_validate_arp(bond, slave, sip, tip);
2540 
2541 out_unlock:
2542         if (arp != (struct arphdr *)skb->data)
2543                 kfree(arp);
2544         return RX_HANDLER_ANOTHER;
2545 }
2546 
2547 /* function to verify if we're in the arp_interval timeslice, returns true if
2548  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2549  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2550  */
2551 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2552                                   int mod)
2553 {
2554         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2555 
2556         return time_in_range(jiffies,
2557                              last_act - delta_in_ticks,
2558                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2559 }
2560 
2561 /* This function is called regularly to monitor each slave's link
2562  * ensuring that traffic is being sent and received when arp monitoring
2563  * is used in load-balancing mode. if the adapter has been dormant, then an
2564  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2565  * arp monitoring in active backup mode.
2566  */
2567 static void bond_loadbalance_arp_mon(struct work_struct *work)
2568 {
2569         struct bonding *bond = container_of(work, struct bonding,
2570                                             arp_work.work);
2571         struct slave *slave, *oldcurrent;
2572         struct list_head *iter;
2573         int do_failover = 0, slave_state_changed = 0;
2574 
2575         if (!bond_has_slaves(bond))
2576                 goto re_arm;
2577 
2578         rcu_read_lock();
2579 
2580         oldcurrent = rcu_dereference(bond->curr_active_slave);
2581         /* see if any of the previous devices are up now (i.e. they have
2582          * xmt and rcv traffic). the curr_active_slave does not come into
2583          * the picture unless it is null. also, slave->last_link_up is not
2584          * needed here because we send an arp on each slave and give a slave
2585          * as long as it needs to get the tx/rx within the delta.
2586          * TODO: what about up/down delay in arp mode? it wasn't here before
2587          *       so it can wait
2588          */
2589         bond_for_each_slave_rcu(bond, slave, iter) {
2590                 unsigned long trans_start = dev_trans_start(slave->dev);
2591 
2592                 if (slave->link != BOND_LINK_UP) {
2593                         if (bond_time_in_interval(bond, trans_start, 1) &&
2594                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2595 
2596                                 slave->link  = BOND_LINK_UP;
2597                                 slave_state_changed = 1;
2598 
2599                                 /* primary_slave has no meaning in round-robin
2600                                  * mode. the window of a slave being up and
2601                                  * curr_active_slave being null after enslaving
2602                                  * is closed.
2603                                  */
2604                                 if (!oldcurrent) {
2605                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2606                                                     slave->dev->name);
2607                                         do_failover = 1;
2608                                 } else {
2609                                         netdev_info(bond->dev, "interface %s is now up\n",
2610                                                     slave->dev->name);
2611                                 }
2612                         }
2613                 } else {
2614                         /* slave->link == BOND_LINK_UP */
2615 
2616                         /* not all switches will respond to an arp request
2617                          * when the source ip is 0, so don't take the link down
2618                          * if we don't know our ip yet
2619                          */
2620                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2621                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2622 
2623                                 slave->link  = BOND_LINK_DOWN;
2624                                 slave_state_changed = 1;
2625 
2626                                 if (slave->link_failure_count < UINT_MAX)
2627                                         slave->link_failure_count++;
2628 
2629                                 netdev_info(bond->dev, "interface %s is now down\n",
2630                                             slave->dev->name);
2631 
2632                                 if (slave == oldcurrent)
2633                                         do_failover = 1;
2634                         }
2635                 }
2636 
2637                 /* note: if switch is in round-robin mode, all links
2638                  * must tx arp to ensure all links rx an arp - otherwise
2639                  * links may oscillate or not come up at all; if switch is
2640                  * in something like xor mode, there is nothing we can
2641                  * do - all replies will be rx'ed on same link causing slaves
2642                  * to be unstable during low/no traffic periods
2643                  */
2644                 if (bond_slave_is_up(slave))
2645                         bond_arp_send_all(bond, slave);
2646         }
2647 
2648         rcu_read_unlock();
2649 
2650         if (do_failover || slave_state_changed) {
2651                 if (!rtnl_trylock())
2652                         goto re_arm;
2653 
2654                 if (slave_state_changed) {
2655                         bond_slave_state_change(bond);
2656                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2657                                 bond_update_slave_arr(bond, NULL);
2658                 }
2659                 if (do_failover) {
2660                         block_netpoll_tx();
2661                         bond_select_active_slave(bond);
2662                         unblock_netpoll_tx();
2663                 }
2664                 rtnl_unlock();
2665         }
2666 
2667 re_arm:
2668         if (bond->params.arp_interval)
2669                 queue_delayed_work(bond->wq, &bond->arp_work,
2670                                    msecs_to_jiffies(bond->params.arp_interval));
2671 }
2672 
2673 /* Called to inspect slaves for active-backup mode ARP monitor link state
2674  * changes.  Sets new_link in slaves to specify what action should take
2675  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2676  * to link states must be committed.
2677  *
2678  * Called with rcu_read_lock held.
2679  */
2680 static int bond_ab_arp_inspect(struct bonding *bond)
2681 {
2682         unsigned long trans_start, last_rx;
2683         struct list_head *iter;
2684         struct slave *slave;
2685         int commit = 0;
2686 
2687         bond_for_each_slave_rcu(bond, slave, iter) {
2688                 slave->new_link = BOND_LINK_NOCHANGE;
2689                 last_rx = slave_last_rx(bond, slave);
2690 
2691                 if (slave->link != BOND_LINK_UP) {
2692                         if (bond_time_in_interval(bond, last_rx, 1)) {
2693                                 slave->new_link = BOND_LINK_UP;
2694                                 commit++;
2695                         }
2696                         continue;
2697                 }
2698 
2699                 /* Give slaves 2*delta after being enslaved or made
2700                  * active.  This avoids bouncing, as the last receive
2701                  * times need a full ARP monitor cycle to be updated.
2702                  */
2703                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2704                         continue;
2705 
2706                 /* Backup slave is down if:
2707                  * - No current_arp_slave AND
2708                  * - more than 3*delta since last receive AND
2709                  * - the bond has an IP address
2710                  *
2711                  * Note: a non-null current_arp_slave indicates
2712                  * the curr_active_slave went down and we are
2713                  * searching for a new one; under this condition
2714                  * we only take the curr_active_slave down - this
2715                  * gives each slave a chance to tx/rx traffic
2716                  * before being taken out
2717                  */
2718                 if (!bond_is_active_slave(slave) &&
2719                     !rcu_access_pointer(bond->current_arp_slave) &&
2720                     !bond_time_in_interval(bond, last_rx, 3)) {
2721                         slave->new_link = BOND_LINK_DOWN;
2722                         commit++;
2723                 }
2724 
2725                 /* Active slave is down if:
2726                  * - more than 2*delta since transmitting OR
2727                  * - (more than 2*delta since receive AND
2728                  *    the bond has an IP address)
2729                  */
2730                 trans_start = dev_trans_start(slave->dev);
2731                 if (bond_is_active_slave(slave) &&
2732                     (!bond_time_in_interval(bond, trans_start, 2) ||
2733                      !bond_time_in_interval(bond, last_rx, 2))) {
2734                         slave->new_link = BOND_LINK_DOWN;
2735                         commit++;
2736                 }
2737         }
2738 
2739         return commit;
2740 }
2741 
2742 /* Called to commit link state changes noted by inspection step of
2743  * active-backup mode ARP monitor.
2744  *
2745  * Called with RTNL hold.
2746  */
2747 static void bond_ab_arp_commit(struct bonding *bond)
2748 {
2749         unsigned long trans_start;
2750         struct list_head *iter;
2751         struct slave *slave;
2752 
2753         bond_for_each_slave(bond, slave, iter) {
2754                 switch (slave->new_link) {
2755                 case BOND_LINK_NOCHANGE:
2756                         continue;
2757 
2758                 case BOND_LINK_UP:
2759                         trans_start = dev_trans_start(slave->dev);
2760                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2761                             (!rtnl_dereference(bond->curr_active_slave) &&
2762                              bond_time_in_interval(bond, trans_start, 1))) {
2763                                 struct slave *current_arp_slave;
2764 
2765                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2766                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2767                                                           BOND_SLAVE_NOTIFY_NOW);
2768                                 if (current_arp_slave) {
2769                                         bond_set_slave_inactive_flags(
2770                                                 current_arp_slave,
2771                                                 BOND_SLAVE_NOTIFY_NOW);
2772                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2773                                 }
2774 
2775                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2776                                             slave->dev->name);
2777 
2778                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2779                                     slave == rtnl_dereference(bond->primary_slave))
2780                                         goto do_failover;
2781 
2782                         }
2783 
2784                         continue;
2785 
2786                 case BOND_LINK_DOWN:
2787                         if (slave->link_failure_count < UINT_MAX)
2788                                 slave->link_failure_count++;
2789 
2790                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2791                                                   BOND_SLAVE_NOTIFY_NOW);
2792                         bond_set_slave_inactive_flags(slave,
2793                                                       BOND_SLAVE_NOTIFY_NOW);
2794 
2795                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2796                                     slave->dev->name);
2797 
2798                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2799                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2800                                 goto do_failover;
2801                         }
2802 
2803                         continue;
2804 
2805                 default:
2806                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2807                                    slave->new_link, slave->dev->name);
2808                         continue;
2809                 }
2810 
2811 do_failover:
2812                 block_netpoll_tx();
2813                 bond_select_active_slave(bond);
2814                 unblock_netpoll_tx();
2815         }
2816 
2817         bond_set_carrier(bond);
2818 }
2819 
2820 /* Send ARP probes for active-backup mode ARP monitor.
2821  *
2822  * Called with rcu_read_lock held.
2823  */
2824 static bool bond_ab_arp_probe(struct bonding *bond)
2825 {
2826         struct slave *slave, *before = NULL, *new_slave = NULL,
2827                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2828                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2829         struct list_head *iter;
2830         bool found = false;
2831         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2832 
2833         if (curr_arp_slave && curr_active_slave)
2834                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2835                             curr_arp_slave->dev->name,
2836                             curr_active_slave->dev->name);
2837 
2838         if (curr_active_slave) {
2839                 bond_arp_send_all(bond, curr_active_slave);
2840                 return should_notify_rtnl;
2841         }
2842 
2843         /* if we don't have a curr_active_slave, search for the next available
2844          * backup slave from the current_arp_slave and make it the candidate
2845          * for becoming the curr_active_slave
2846          */
2847 
2848         if (!curr_arp_slave) {
2849                 curr_arp_slave = bond_first_slave_rcu(bond);
2850                 if (!curr_arp_slave)
2851                         return should_notify_rtnl;
2852         }
2853 
2854         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2855 
2856         bond_for_each_slave_rcu(bond, slave, iter) {
2857                 if (!found && !before && bond_slave_is_up(slave))
2858                         before = slave;
2859 
2860                 if (found && !new_slave && bond_slave_is_up(slave))
2861                         new_slave = slave;
2862                 /* if the link state is up at this point, we
2863                  * mark it down - this can happen if we have
2864                  * simultaneous link failures and
2865                  * reselect_active_interface doesn't make this
2866                  * one the current slave so it is still marked
2867                  * up when it is actually down
2868                  */
2869                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2870                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2871                                                   BOND_SLAVE_NOTIFY_LATER);
2872                         if (slave->link_failure_count < UINT_MAX)
2873                                 slave->link_failure_count++;
2874 
2875                         bond_set_slave_inactive_flags(slave,
2876                                                       BOND_SLAVE_NOTIFY_LATER);
2877 
2878                         netdev_info(bond->dev, "backup interface %s is now down\n",
2879                                     slave->dev->name);
2880                 }
2881                 if (slave == curr_arp_slave)
2882                         found = true;
2883         }
2884 
2885         if (!new_slave && before)
2886                 new_slave = before;
2887 
2888         if (!new_slave)
2889                 goto check_state;
2890 
2891         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2892                                   BOND_SLAVE_NOTIFY_LATER);
2893         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2894         bond_arp_send_all(bond, new_slave);
2895         new_slave->last_link_up = jiffies;
2896         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2897 
2898 check_state:
2899         bond_for_each_slave_rcu(bond, slave, iter) {
2900                 if (slave->should_notify || slave->should_notify_link) {
2901                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2902                         break;
2903                 }
2904         }
2905         return should_notify_rtnl;
2906 }
2907 
2908 static void bond_activebackup_arp_mon(struct work_struct *work)
2909 {
2910         struct bonding *bond = container_of(work, struct bonding,
2911                                             arp_work.work);
2912         bool should_notify_peers = false;
2913         bool should_notify_rtnl = false;
2914         int delta_in_ticks;
2915 
2916         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2917 
2918         if (!bond_has_slaves(bond))
2919                 goto re_arm;
2920 
2921         rcu_read_lock();
2922 
2923         should_notify_peers = bond_should_notify_peers(bond);
2924 
2925         if (bond_ab_arp_inspect(bond)) {
2926                 rcu_read_unlock();
2927 
2928                 /* Race avoidance with bond_close flush of workqueue */
2929                 if (!rtnl_trylock()) {
2930                         delta_in_ticks = 1;
2931                         should_notify_peers = false;
2932                         goto re_arm;
2933                 }
2934 
2935                 bond_ab_arp_commit(bond);
2936 
2937                 rtnl_unlock();
2938                 rcu_read_lock();
2939         }
2940 
2941         should_notify_rtnl = bond_ab_arp_probe(bond);
2942         rcu_read_unlock();
2943 
2944 re_arm:
2945         if (bond->params.arp_interval)
2946                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2947 
2948         if (should_notify_peers || should_notify_rtnl) {
2949                 if (!rtnl_trylock())
2950                         return;
2951 
2952                 if (should_notify_peers)
2953                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2954                                                  bond->dev);
2955                 if (should_notify_rtnl) {
2956                         bond_slave_state_notify(bond);
2957                         bond_slave_link_notify(bond);
2958                 }
2959 
2960                 rtnl_unlock();
2961         }
2962 }
2963 
2964 /*-------------------------- netdev event handling --------------------------*/
2965 
2966 /* Change device name */
2967 static int bond_event_changename(struct bonding *bond)
2968 {
2969         bond_remove_proc_entry(bond);
2970         bond_create_proc_entry(bond);
2971 
2972         bond_debug_reregister(bond);
2973 
2974         return NOTIFY_DONE;
2975 }
2976 
2977 static int bond_master_netdev_event(unsigned long event,
2978                                     struct net_device *bond_dev)
2979 {
2980         struct bonding *event_bond = netdev_priv(bond_dev);
2981 
2982         switch (event) {
2983         case NETDEV_CHANGENAME:
2984                 return bond_event_changename(event_bond);
2985         case NETDEV_UNREGISTER:
2986                 bond_remove_proc_entry(event_bond);
2987                 break;
2988         case NETDEV_REGISTER:
2989                 bond_create_proc_entry(event_bond);
2990                 break;
2991         case NETDEV_NOTIFY_PEERS:
2992                 if (event_bond->send_peer_notif)
2993                         event_bond->send_peer_notif--;
2994                 break;
2995         default:
2996                 break;
2997         }
2998 
2999         return NOTIFY_DONE;
3000 }
3001 
3002 static int bond_slave_netdev_event(unsigned long event,
3003                                    struct net_device *slave_dev)
3004 {
3005         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3006         struct bonding *bond;
3007         struct net_device *bond_dev;
3008 
3009         /* A netdev event can be generated while enslaving a device
3010          * before netdev_rx_handler_register is called in which case
3011          * slave will be NULL
3012          */
3013         if (!slave)
3014                 return NOTIFY_DONE;
3015         bond_dev = slave->bond->dev;
3016         bond = slave->bond;
3017         primary = rtnl_dereference(bond->primary_slave);
3018 
3019         switch (event) {
3020         case NETDEV_UNREGISTER:
3021                 if (bond_dev->type != ARPHRD_ETHER)
3022                         bond_release_and_destroy(bond_dev, slave_dev);
3023                 else
3024                         bond_release(bond_dev, slave_dev);
3025                 break;
3026         case NETDEV_UP:
3027         case NETDEV_CHANGE:
3028                 bond_update_speed_duplex(slave);
3029                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3030                         bond_3ad_adapter_speed_duplex_changed(slave);
3031                 /* Fallthrough */
3032         case NETDEV_DOWN:
3033                 /* Refresh slave-array if applicable!
3034                  * If the setup does not use miimon or arpmon (mode-specific!),
3035                  * then these events will not cause the slave-array to be
3036                  * refreshed. This will cause xmit to use a slave that is not
3037                  * usable. Avoid such situation by refeshing the array at these
3038                  * events. If these (miimon/arpmon) parameters are configured
3039                  * then array gets refreshed twice and that should be fine!
3040                  */
3041                 if (bond_mode_uses_xmit_hash(bond))
3042                         bond_update_slave_arr(bond, NULL);
3043                 break;
3044         case NETDEV_CHANGEMTU:
3045                 /* TODO: Should slaves be allowed to
3046                  * independently alter their MTU?  For
3047                  * an active-backup bond, slaves need
3048                  * not be the same type of device, so
3049                  * MTUs may vary.  For other modes,
3050                  * slaves arguably should have the
3051                  * same MTUs. To do this, we'd need to
3052                  * take over the slave's change_mtu
3053                  * function for the duration of their
3054                  * servitude.
3055                  */
3056                 break;
3057         case NETDEV_CHANGENAME:
3058                 /* we don't care if we don't have primary set */
3059                 if (!bond_uses_primary(bond) ||
3060                     !bond->params.primary[0])
3061                         break;
3062 
3063                 if (slave == primary) {
3064                         /* slave's name changed - he's no longer primary */
3065                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3066                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3067                         /* we have a new primary slave */
3068                         rcu_assign_pointer(bond->primary_slave, slave);
3069                 } else { /* we didn't change primary - exit */
3070                         break;
3071                 }
3072 
3073                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3074                             primary ? slave_dev->name : "none");
3075 
3076                 block_netpoll_tx();
3077                 bond_select_active_slave(bond);
3078                 unblock_netpoll_tx();
3079                 break;
3080         case NETDEV_FEAT_CHANGE:
3081                 bond_compute_features(bond);
3082                 break;
3083         case NETDEV_RESEND_IGMP:
3084                 /* Propagate to master device */
3085                 call_netdevice_notifiers(event, slave->bond->dev);
3086                 break;
3087         default:
3088                 break;
3089         }
3090 
3091         return NOTIFY_DONE;
3092 }
3093 
3094 /* bond_netdev_event: handle netdev notifier chain events.
3095  *
3096  * This function receives events for the netdev chain.  The caller (an
3097  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3098  * locks for us to safely manipulate the slave devices (RTNL lock,
3099  * dev_probe_lock).
3100  */
3101 static int bond_netdev_event(struct notifier_block *this,
3102                              unsigned long event, void *ptr)
3103 {
3104         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3105 
3106         netdev_dbg(event_dev, "event: %lx\n", event);
3107 
3108         if (!(event_dev->priv_flags & IFF_BONDING))
3109                 return NOTIFY_DONE;
3110 
3111         if (event_dev->flags & IFF_MASTER) {
3112                 netdev_dbg(event_dev, "IFF_MASTER\n");
3113                 return bond_master_netdev_event(event, event_dev);
3114         }
3115 
3116         if (event_dev->flags & IFF_SLAVE) {
3117                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3118                 return bond_slave_netdev_event(event, event_dev);
3119         }
3120 
3121         return NOTIFY_DONE;
3122 }
3123 
3124 static struct notifier_block bond_netdev_notifier = {
3125         .notifier_call = bond_netdev_event,
3126 };
3127 
3128 /*---------------------------- Hashing Policies -----------------------------*/
3129 
3130 /* L2 hash helper */
3131 static inline u32 bond_eth_hash(struct sk_buff *skb)
3132 {
3133         struct ethhdr *ep, hdr_tmp;
3134 
3135         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3136         if (ep)
3137                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3138         return 0;
3139 }
3140 
3141 /* Extract the appropriate headers based on bond's xmit policy */
3142 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3143                               struct flow_keys *fk)
3144 {
3145         const struct ipv6hdr *iph6;
3146         const struct iphdr *iph;
3147         int noff, proto = -1;
3148 
3149         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3150                 return skb_flow_dissect_flow_keys(skb, fk, 0);
3151 
3152         fk->ports.ports = 0;
3153         noff = skb_network_offset(skb);
3154         if (skb->protocol == htons(ETH_P_IP)) {
3155                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3156                         return false;
3157                 iph = ip_hdr(skb);
3158                 iph_to_flow_copy_v4addrs(fk, iph);
3159                 noff += iph->ihl << 2;
3160                 if (!ip_is_fragment(iph))
3161                         proto = iph->protocol;
3162         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3163                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3164                         return false;
3165                 iph6 = ipv6_hdr(skb);
3166                 iph_to_flow_copy_v6addrs(fk, iph6);
3167                 noff += sizeof(*iph6);
3168                 proto = iph6->nexthdr;
3169         } else {
3170                 return false;
3171         }
3172         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3173                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3174 
3175         return true;
3176 }
3177 
3178 /**
3179  * bond_xmit_hash - generate a hash value based on the xmit policy
3180  * @bond: bonding device
3181  * @skb: buffer to use for headers
3182  *
3183  * This function will extract the necessary headers from the skb buffer and use
3184  * them to generate a hash based on the xmit_policy set in the bonding device
3185  */
3186 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3187 {
3188         struct flow_keys flow;
3189         u32 hash;
3190 
3191         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3192             skb->l4_hash)
3193                 return skb->hash;
3194 
3195         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3196             !bond_flow_dissect(bond, skb, &flow))
3197                 return bond_eth_hash(skb);
3198 
3199         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3200             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3201                 hash = bond_eth_hash(skb);
3202         else
3203                 hash = (__force u32)flow.ports.ports;
3204         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3205                 (__force u32)flow_get_u32_src(&flow);
3206         hash ^= (hash >> 16);
3207         hash ^= (hash >> 8);
3208 
3209         return hash;
3210 }
3211 
3212 /*-------------------------- Device entry points ----------------------------*/
3213 
3214 static void bond_work_init_all(struct bonding *bond)
3215 {
3216         INIT_DELAYED_WORK(&bond->mcast_work,
3217                           bond_resend_igmp_join_requests_delayed);
3218         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3219         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3220         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3221                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3222         else
3223                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3224         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3225         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3226 }
3227 
3228 static void bond_work_cancel_all(struct bonding *bond)
3229 {
3230         cancel_delayed_work_sync(&bond->mii_work);
3231         cancel_delayed_work_sync(&bond->arp_work);
3232         cancel_delayed_work_sync(&bond->alb_work);
3233         cancel_delayed_work_sync(&bond->ad_work);
3234         cancel_delayed_work_sync(&bond->mcast_work);
3235         cancel_delayed_work_sync(&bond->slave_arr_work);
3236 }
3237 
3238 static int bond_open(struct net_device *bond_dev)
3239 {
3240         struct bonding *bond = netdev_priv(bond_dev);
3241         struct list_head *iter;
3242         struct slave *slave;
3243 
3244         /* reset slave->backup and slave->inactive */
3245         if (bond_has_slaves(bond)) {
3246                 bond_for_each_slave(bond, slave, iter) {
3247                         if (bond_uses_primary(bond) &&
3248                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3249                                 bond_set_slave_inactive_flags(slave,
3250                                                               BOND_SLAVE_NOTIFY_NOW);
3251                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3252                                 bond_set_slave_active_flags(slave,
3253                                                             BOND_SLAVE_NOTIFY_NOW);
3254                         }
3255                 }
3256         }
3257 
3258         bond_work_init_all(bond);
3259 
3260         if (bond_is_lb(bond)) {
3261                 /* bond_alb_initialize must be called before the timer
3262                  * is started.
3263                  */
3264                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3265                         return -ENOMEM;
3266                 if (bond->params.tlb_dynamic_lb)
3267                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3268         }
3269 
3270         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3271                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3272 
3273         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3274                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3275                 bond->recv_probe = bond_arp_rcv;
3276         }
3277 
3278         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3279                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3280                 /* register to receive LACPDUs */
3281                 bond->recv_probe = bond_3ad_lacpdu_recv;
3282                 bond_3ad_initiate_agg_selection(bond, 1);
3283         }
3284 
3285         if (bond_mode_uses_xmit_hash(bond))
3286                 bond_update_slave_arr(bond, NULL);
3287 
3288         return 0;
3289 }
3290 
3291 static int bond_close(struct net_device *bond_dev)
3292 {
3293         struct bonding *bond = netdev_priv(bond_dev);
3294 
3295         bond_work_cancel_all(bond);
3296         bond->send_peer_notif = 0;
3297         if (bond_is_lb(bond))
3298                 bond_alb_deinitialize(bond);
3299         bond->recv_probe = NULL;
3300 
3301         return 0;
3302 }
3303 
3304 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3305  * that some drivers can provide 32bit values only.
3306  */
3307 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3308                             const struct rtnl_link_stats64 *_new,
3309                             const struct rtnl_link_stats64 *_old)
3310 {
3311         const u64 *new = (const u64 *)_new;
3312         const u64 *old = (const u64 *)_old;
3313         u64 *res = (u64 *)_res;
3314         int i;
3315 
3316         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3317                 u64 nv = new[i];
3318                 u64 ov = old[i];
3319 
3320                 /* detects if this particular field is 32bit only */
3321                 if (((nv | ov) >> 32) == 0)
3322                         res[i] += (u32)nv - (u32)ov;
3323                 else
3324                         res[i] += nv - ov;
3325         }
3326 }
3327 
3328 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3329                                                 struct rtnl_link_stats64 *stats)
3330 {
3331         struct bonding *bond = netdev_priv(bond_dev);
3332         struct rtnl_link_stats64 temp;
3333         struct list_head *iter;
3334         struct slave *slave;
3335 
3336         spin_lock(&bond->stats_lock);
3337         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3338 
3339         rcu_read_lock();
3340         bond_for_each_slave_rcu(bond, slave, iter) {
3341                 const struct rtnl_link_stats64 *new =
3342                         dev_get_stats(slave->dev, &temp);
3343 
3344                 bond_fold_stats(stats, new, &slave->slave_stats);
3345 
3346                 /* save off the slave stats for the next run */
3347                 memcpy(&slave->slave_stats, new, sizeof(*new));
3348         }
3349         rcu_read_unlock();
3350 
3351         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3352         spin_unlock(&bond->stats_lock);
3353 
3354         return stats;
3355 }
3356 
3357 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3358 {
3359         struct bonding *bond = netdev_priv(bond_dev);
3360         struct net_device *slave_dev = NULL;
3361         struct ifbond k_binfo;
3362         struct ifbond __user *u_binfo = NULL;
3363         struct ifslave k_sinfo;
3364         struct ifslave __user *u_sinfo = NULL;
3365         struct mii_ioctl_data *mii = NULL;
3366         struct bond_opt_value newval;
3367         struct net *net;
3368         int res = 0;
3369 
3370         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3371 
3372         switch (cmd) {
3373         case SIOCGMIIPHY:
3374                 mii = if_mii(ifr);
3375                 if (!mii)
3376                         return -EINVAL;
3377 
3378                 mii->phy_id = 0;
3379                 /* Fall Through */
3380         case SIOCGMIIREG:
3381                 /* We do this again just in case we were called by SIOCGMIIREG
3382                  * instead of SIOCGMIIPHY.
3383                  */
3384                 mii = if_mii(ifr);
3385                 if (!mii)
3386                         return -EINVAL;
3387 
3388                 if (mii->reg_num == 1) {
3389                         mii->val_out = 0;
3390                         if (netif_carrier_ok(bond->dev))
3391                                 mii->val_out = BMSR_LSTATUS;
3392                 }
3393 
3394                 return 0;
3395         case BOND_INFO_QUERY_OLD:
3396         case SIOCBONDINFOQUERY:
3397                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3398 
3399                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3400                         return -EFAULT;
3401 
3402                 res = bond_info_query(bond_dev, &k_binfo);
3403                 if (res == 0 &&
3404                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3405                         return -EFAULT;
3406 
3407                 return res;
3408         case BOND_SLAVE_INFO_QUERY_OLD:
3409         case SIOCBONDSLAVEINFOQUERY:
3410                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3411 
3412                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3413                         return -EFAULT;
3414 
3415                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3416                 if (res == 0 &&
3417                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3418                         return -EFAULT;
3419 
3420                 return res;
3421         default:
3422                 break;
3423         }
3424 
3425         net = dev_net(bond_dev);
3426 
3427         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3428                 return -EPERM;
3429 
3430         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3431 
3432         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3433 
3434         if (!slave_dev)
3435                 return -ENODEV;
3436 
3437         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3438         switch (cmd) {
3439         case BOND_ENSLAVE_OLD:
3440         case SIOCBONDENSLAVE:
3441                 res = bond_enslave(bond_dev, slave_dev);
3442                 break;
3443         case BOND_RELEASE_OLD:
3444         case SIOCBONDRELEASE:
3445                 res = bond_release(bond_dev, slave_dev);
3446                 break;
3447         case BOND_SETHWADDR_OLD:
3448         case SIOCBONDSETHWADDR:
3449                 bond_set_dev_addr(bond_dev, slave_dev);
3450                 res = 0;
3451                 break;
3452         case BOND_CHANGE_ACTIVE_OLD:
3453         case SIOCBONDCHANGEACTIVE:
3454                 bond_opt_initstr(&newval, slave_dev->name);
3455                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3456                 break;
3457         default:
3458                 res = -EOPNOTSUPP;
3459         }
3460 
3461         return res;
3462 }
3463 
3464 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3465 {
3466         struct bonding *bond = netdev_priv(bond_dev);
3467 
3468         if (change & IFF_PROMISC)
3469                 bond_set_promiscuity(bond,
3470                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3471 
3472         if (change & IFF_ALLMULTI)
3473                 bond_set_allmulti(bond,
3474                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3475 }
3476 
3477 static void bond_set_rx_mode(struct net_device *bond_dev)
3478 {
3479         struct bonding *bond = netdev_priv(bond_dev);
3480         struct list_head *iter;
3481         struct slave *slave;
3482 
3483         rcu_read_lock();
3484         if (bond_uses_primary(bond)) {
3485                 slave = rcu_dereference(bond->curr_active_slave);
3486                 if (slave) {
3487                         dev_uc_sync(slave->dev, bond_dev);
3488                         dev_mc_sync(slave->dev, bond_dev);
3489                 }
3490         } else {
3491                 bond_for_each_slave_rcu(bond, slave, iter) {
3492                         dev_uc_sync_multiple(slave->dev, bond_dev);
3493                         dev_mc_sync_multiple(slave->dev, bond_dev);
3494                 }
3495         }
3496         rcu_read_unlock();
3497 }
3498 
3499 static int bond_neigh_init(struct neighbour *n)
3500 {
3501         struct bonding *bond = netdev_priv(n->dev);
3502         const struct net_device_ops *slave_ops;
3503         struct neigh_parms parms;
3504         struct slave *slave;
3505         int ret;
3506 
3507         slave = bond_first_slave(bond);
3508         if (!slave)
3509                 return 0;
3510         slave_ops = slave->dev->netdev_ops;
3511         if (!slave_ops->ndo_neigh_setup)
3512                 return 0;
3513 
3514         parms.neigh_setup = NULL;
3515         parms.neigh_cleanup = NULL;
3516         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3517         if (ret)
3518                 return ret;
3519 
3520         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3521          * after the last slave has been detached.  Assumes that all slaves
3522          * utilize the same neigh_cleanup (true at this writing as only user
3523          * is ipoib).
3524          */
3525         n->parms->neigh_cleanup = parms.neigh_cleanup;
3526 
3527         if (!parms.neigh_setup)
3528                 return 0;
3529 
3530         return parms.neigh_setup(n);
3531 }
3532 
3533 /* The bonding ndo_neigh_setup is called at init time beofre any
3534  * slave exists. So we must declare proxy setup function which will
3535  * be used at run time to resolve the actual slave neigh param setup.
3536  *
3537  * It's also called by master devices (such as vlans) to setup their
3538  * underlying devices. In that case - do nothing, we're already set up from
3539  * our init.
3540  */
3541 static int bond_neigh_setup(struct net_device *dev,
3542                             struct neigh_parms *parms)
3543 {
3544         /* modify only our neigh_parms */
3545         if (parms->dev == dev)
3546                 parms->neigh_setup = bond_neigh_init;
3547 
3548         return 0;
3549 }
3550 
3551 /* Change the MTU of all of a master's slaves to match the master */
3552 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3553 {
3554         struct bonding *bond = netdev_priv(bond_dev);
3555         struct slave *slave, *rollback_slave;
3556         struct list_head *iter;
3557         int res = 0;
3558 
3559         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3560 
3561         bond_for_each_slave(bond, slave, iter) {
3562                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3563                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3564 
3565                 res = dev_set_mtu(slave->dev, new_mtu);
3566 
3567                 if (res) {
3568                         /* If we failed to set the slave's mtu to the new value
3569                          * we must abort the operation even in ACTIVE_BACKUP
3570                          * mode, because if we allow the backup slaves to have
3571                          * different mtu values than the active slave we'll
3572                          * need to change their mtu when doing a failover. That
3573                          * means changing their mtu from timer context, which
3574                          * is probably not a good idea.
3575                          */
3576                         netdev_dbg(bond_dev, "err %d %s\n", res,
3577                                    slave->dev->name);
3578                         goto unwind;
3579                 }
3580         }
3581 
3582         bond_dev->mtu = new_mtu;
3583 
3584         return 0;
3585 
3586 unwind:
3587         /* unwind from head to the slave that failed */
3588         bond_for_each_slave(bond, rollback_slave, iter) {
3589                 int tmp_res;
3590 
3591                 if (rollback_slave == slave)
3592                         break;
3593 
3594                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3595                 if (tmp_res) {
3596                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3597                                    tmp_res, rollback_slave->dev->name);
3598                 }
3599         }
3600 
3601         return res;
3602 }
3603 
3604 /* Change HW address
3605  *
3606  * Note that many devices must be down to change the HW address, and
3607  * downing the master releases all slaves.  We can make bonds full of
3608  * bonding devices to test this, however.
3609  */
3610 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3611 {
3612         struct bonding *bond = netdev_priv(bond_dev);
3613         struct slave *slave, *rollback_slave;
3614         struct sockaddr *sa = addr, tmp_sa;
3615         struct list_head *iter;
3616         int res = 0;
3617 
3618         if (BOND_MODE(bond) == BOND_MODE_ALB)
3619                 return bond_alb_set_mac_address(bond_dev, addr);
3620 
3621 
3622         netdev_dbg(bond_dev, "bond=%p\n", bond);
3623 
3624         /* If fail_over_mac is enabled, do nothing and return success.
3625          * Returning an error causes ifenslave to fail.
3626          */
3627         if (bond->params.fail_over_mac &&
3628             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3629                 return 0;
3630 
3631         if (!is_valid_ether_addr(sa->sa_data))
3632                 return -EADDRNOTAVAIL;
3633 
3634         bond_for_each_slave(bond, slave, iter) {
3635                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3636                 res = dev_set_mac_address(slave->dev, addr);
3637                 if (res) {
3638                         /* TODO: consider downing the slave
3639                          * and retry ?
3640                          * User should expect communications
3641                          * breakage anyway until ARP finish
3642                          * updating, so...
3643                          */
3644                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3645                         goto unwind;
3646                 }
3647         }
3648 
3649         /* success */
3650         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3651         return 0;
3652 
3653 unwind:
3654         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3655         tmp_sa.sa_family = bond_dev->type;
3656 
3657         /* unwind from head to the slave that failed */
3658         bond_for_each_slave(bond, rollback_slave, iter) {
3659                 int tmp_res;
3660 
3661                 if (rollback_slave == slave)
3662                         break;
3663 
3664                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3665                 if (tmp_res) {
3666                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3667                                    tmp_res, rollback_slave->dev->name);
3668                 }
3669         }
3670 
3671         return res;
3672 }
3673 
3674 /**
3675  * bond_xmit_slave_id - transmit skb through slave with slave_id
3676  * @bond: bonding device that is transmitting
3677  * @skb: buffer to transmit
3678  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3679  *
3680  * This function tries to transmit through slave with slave_id but in case
3681  * it fails, it tries to find the first available slave for transmission.
3682  * The skb is consumed in all cases, thus the function is void.
3683  */
3684 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3685 {
3686         struct list_head *iter;
3687         struct slave *slave;
3688         int i = slave_id;
3689 
3690         /* Here we start from the slave with slave_id */
3691         bond_for_each_slave_rcu(bond, slave, iter) {
3692                 if (--i < 0) {
3693                         if (bond_slave_can_tx(slave)) {
3694                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3695                                 return;
3696                         }
3697                 }
3698         }
3699 
3700         /* Here we start from the first slave up to slave_id */
3701         i = slave_id;
3702         bond_for_each_slave_rcu(bond, slave, iter) {
3703                 if (--i < 0)
3704                         break;
3705                 if (bond_slave_can_tx(slave)) {
3706                         bond_dev_queue_xmit(bond, skb, slave->dev);
3707                         return;
3708                 }
3709         }
3710         /* no slave that can tx has been found */
3711         bond_tx_drop(bond->dev, skb);
3712 }
3713 
3714 /**
3715  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3716  * @bond: bonding device to use
3717  *
3718  * Based on the value of the bonding device's packets_per_slave parameter
3719  * this function generates a slave id, which is usually used as the next
3720  * slave to transmit through.
3721  */
3722 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3723 {
3724         u32 slave_id;
3725         struct reciprocal_value reciprocal_packets_per_slave;
3726         int packets_per_slave = bond->params.packets_per_slave;
3727 
3728         switch (packets_per_slave) {
3729         case 0:
3730                 slave_id = prandom_u32();
3731                 break;
3732         case 1:
3733                 slave_id = bond->rr_tx_counter;
3734                 break;
3735         default:
3736                 reciprocal_packets_per_slave =
3737                         bond->params.reciprocal_packets_per_slave;
3738                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3739                                              reciprocal_packets_per_slave);
3740                 break;
3741         }
3742         bond->rr_tx_counter++;
3743 
3744         return slave_id;
3745 }
3746 
3747 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3748 {
3749         struct bonding *bond = netdev_priv(bond_dev);
3750         struct iphdr *iph = ip_hdr(skb);
3751         struct slave *slave;
3752         u32 slave_id;
3753 
3754         /* Start with the curr_active_slave that joined the bond as the
3755          * default for sending IGMP traffic.  For failover purposes one
3756          * needs to maintain some consistency for the interface that will
3757          * send the join/membership reports.  The curr_active_slave found
3758          * will send all of this type of traffic.
3759          */
3760         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3761                 slave = rcu_dereference(bond->curr_active_slave);
3762                 if (slave)
3763                         bond_dev_queue_xmit(bond, skb, slave->dev);
3764                 else
3765                         bond_xmit_slave_id(bond, skb, 0);
3766         } else {
3767                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3768 
3769                 if (likely(slave_cnt)) {
3770                         slave_id = bond_rr_gen_slave_id(bond);
3771                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3772                 } else {
3773                         bond_tx_drop(bond_dev, skb);
3774                 }
3775         }
3776 
3777         return NETDEV_TX_OK;
3778 }
3779 
3780 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3781  * the bond has a usable interface.
3782  */
3783 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3784 {
3785         struct bonding *bond = netdev_priv(bond_dev);
3786         struct slave *slave;
3787 
3788         slave = rcu_dereference(bond->curr_active_slave);
3789         if (slave)
3790                 bond_dev_queue_xmit(bond, skb, slave->dev);
3791         else
3792                 bond_tx_drop(bond_dev, skb);
3793 
3794         return NETDEV_TX_OK;
3795 }
3796 
3797 /* Use this to update slave_array when (a) it's not appropriate to update
3798  * slave_array right away (note that update_slave_array() may sleep)
3799  * and / or (b) RTNL is not held.
3800  */
3801 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3802 {
3803         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3804 }
3805 
3806 /* Slave array work handler. Holds only RTNL */
3807 static void bond_slave_arr_handler(struct work_struct *work)
3808 {
3809         struct bonding *bond = container_of(work, struct bonding,
3810                                             slave_arr_work.work);
3811         int ret;
3812 
3813         if (!rtnl_trylock())
3814                 goto err;
3815 
3816         ret = bond_update_slave_arr(bond, NULL);
3817         rtnl_unlock();
3818         if (ret) {
3819                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3820                 goto err;
3821         }
3822         return;
3823 
3824 err:
3825         bond_slave_arr_work_rearm(bond, 1);
3826 }
3827 
3828 /* Build the usable slaves array in control path for modes that use xmit-hash
3829  * to determine the slave interface -
3830  * (a) BOND_MODE_8023AD
3831  * (b) BOND_MODE_XOR
3832  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3833  *
3834  * The caller is expected to hold RTNL only and NO other lock!
3835  */
3836 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3837 {
3838         struct slave *slave;
3839         struct list_head *iter;
3840         struct bond_up_slave *new_arr, *old_arr;
3841         int agg_id = 0;
3842         int ret = 0;
3843 
3844 #ifdef CONFIG_LOCKDEP
3845         WARN_ON(lockdep_is_held(&bond->mode_lock));
3846 #endif
3847 
3848         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3849                           GFP_KERNEL);
3850         if (!new_arr) {
3851                 ret = -ENOMEM;
3852                 pr_err("Failed to build slave-array.\n");
3853                 goto out;
3854         }
3855         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3856                 struct ad_info ad_info;
3857 
3858                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3859                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3860                         kfree_rcu(new_arr, rcu);
3861                         /* No active aggragator means it's not safe to use
3862                          * the previous array.
3863                          */
3864                         old_arr = rtnl_dereference(bond->slave_arr);
3865                         if (old_arr) {
3866                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3867                                 kfree_rcu(old_arr, rcu);
3868                         }
3869                         goto out;
3870                 }
3871                 agg_id = ad_info.aggregator_id;
3872         }
3873         bond_for_each_slave(bond, slave, iter) {
3874                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3875                         struct aggregator *agg;
3876 
3877                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3878                         if (!agg || agg->aggregator_identifier != agg_id)
3879                                 continue;
3880                 }
3881                 if (!bond_slave_can_tx(slave))
3882                         continue;
3883                 if (skipslave == slave)
3884                         continue;
3885                 new_arr->arr[new_arr->count++] = slave;
3886         }
3887 
3888         old_arr = rtnl_dereference(bond->slave_arr);
3889         rcu_assign_pointer(bond->slave_arr, new_arr);
3890         if (old_arr)
3891                 kfree_rcu(old_arr, rcu);
3892 out:
3893         if (ret != 0 && skipslave) {
3894                 int idx;
3895 
3896                 /* Rare situation where caller has asked to skip a specific
3897                  * slave but allocation failed (most likely!). BTW this is
3898                  * only possible when the call is initiated from
3899                  * __bond_release_one(). In this situation; overwrite the
3900                  * skipslave entry in the array with the last entry from the
3901                  * array to avoid a situation where the xmit path may choose
3902                  * this to-be-skipped slave to send a packet out.
3903                  */
3904                 old_arr = rtnl_dereference(bond->slave_arr);
3905                 for (idx = 0; idx < old_arr->count; idx++) {
3906                         if (skipslave == old_arr->arr[idx]) {
3907                                 old_arr->arr[idx] =
3908                                     old_arr->arr[old_arr->count-1];
3909                                 old_arr->count--;
3910                                 break;
3911                         }
3912                 }
3913         }
3914         return ret;
3915 }
3916 
3917 /* Use this Xmit function for 3AD as well as XOR modes. The current
3918  * usable slave array is formed in the control path. The xmit function
3919  * just calculates hash and sends the packet out.
3920  */
3921 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3922 {
3923         struct bonding *bond = netdev_priv(dev);
3924         struct slave *slave;
3925         struct bond_up_slave *slaves;
3926         unsigned int count;
3927 
3928         slaves = rcu_dereference(bond->slave_arr);
3929         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3930         if (likely(count)) {
3931                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3932                 bond_dev_queue_xmit(bond, skb, slave->dev);
3933         } else {
3934                 bond_tx_drop(dev, skb);
3935         }
3936 
3937         return NETDEV_TX_OK;
3938 }
3939 
3940 /* in broadcast mode, we send everything to all usable interfaces. */
3941 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3942 {
3943         struct bonding *bond = netdev_priv(bond_dev);
3944         struct slave *slave = NULL;
3945         struct list_head *iter;
3946 
3947         bond_for_each_slave_rcu(bond, slave, iter) {
3948                 if (bond_is_last_slave(bond, slave))
3949                         break;
3950                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3951                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3952 
3953                         if (!skb2) {
3954                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3955                                                     bond_dev->name, __func__);
3956                                 continue;
3957                         }
3958                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3959                 }
3960         }
3961         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3962                 bond_dev_queue_xmit(bond, skb, slave->dev);
3963         else
3964                 bond_tx_drop(bond_dev, skb);
3965 
3966         return NETDEV_TX_OK;
3967 }
3968 
3969 /*------------------------- Device initialization ---------------------------*/
3970 
3971 /* Lookup the slave that corresponds to a qid */
3972 static inline int bond_slave_override(struct bonding *bond,
3973                                       struct sk_buff *skb)
3974 {
3975         struct slave *slave = NULL;
3976         struct list_head *iter;
3977 
3978         if (!skb->queue_mapping)
3979                 return 1;
3980 
3981         /* Find out if any slaves have the same mapping as this skb. */
3982         bond_for_each_slave_rcu(bond, slave, iter) {
3983                 if (slave->queue_id == skb->queue_mapping) {
3984                         if (bond_slave_is_up(slave) &&
3985                             slave->link == BOND_LINK_UP) {
3986                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3987                                 return 0;
3988                         }
3989                         /* If the slave isn't UP, use default transmit policy. */
3990                         break;
3991                 }
3992         }
3993 
3994         return 1;
3995 }
3996 
3997 
3998 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3999                              void *accel_priv, select_queue_fallback_t fallback)
4000 {
4001         /* This helper function exists to help dev_pick_tx get the correct
4002          * destination queue.  Using a helper function skips a call to
4003          * skb_tx_hash and will put the skbs in the queue we expect on their
4004          * way down to the bonding driver.
4005          */
4006         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4007 
4008         /* Save the original txq to restore before passing to the driver */
4009         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4010 
4011         if (unlikely(txq >= dev->real_num_tx_queues)) {
4012                 do {
4013                         txq -= dev->real_num_tx_queues;
4014                 } while (txq >= dev->real_num_tx_queues);
4015         }
4016         return txq;
4017 }
4018 
4019 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4020 {
4021         struct bonding *bond = netdev_priv(dev);
4022 
4023         if (bond_should_override_tx_queue(bond) &&
4024             !bond_slave_override(bond, skb))
4025                 return NETDEV_TX_OK;
4026 
4027         switch (BOND_MODE(bond)) {
4028         case BOND_MODE_ROUNDROBIN:
4029                 return bond_xmit_roundrobin(skb, dev);
4030         case BOND_MODE_ACTIVEBACKUP:
4031                 return bond_xmit_activebackup(skb, dev);
4032         case BOND_MODE_8023AD:
4033         case BOND_MODE_XOR:
4034                 return bond_3ad_xor_xmit(skb, dev);
4035         case BOND_MODE_BROADCAST:
4036                 return bond_xmit_broadcast(skb, dev);
4037         case BOND_MODE_ALB:
4038                 return bond_alb_xmit(skb, dev);
4039         case BOND_MODE_TLB:
4040                 return bond_tlb_xmit(skb, dev);
4041         default:
4042                 /* Should never happen, mode already checked */
4043                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4044                 WARN_ON_ONCE(1);
4045                 bond_tx_drop(dev, skb);
4046                 return NETDEV_TX_OK;
4047         }
4048 }
4049 
4050 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4051 {
4052         struct bonding *bond = netdev_priv(dev);
4053         netdev_tx_t ret = NETDEV_TX_OK;
4054 
4055         /* If we risk deadlock from transmitting this in the
4056          * netpoll path, tell netpoll to queue the frame for later tx
4057          */
4058         if (unlikely(is_netpoll_tx_blocked(dev)))
4059                 return NETDEV_TX_BUSY;
4060 
4061         rcu_read_lock();
4062         if (bond_has_slaves(bond))
4063                 ret = __bond_start_xmit(skb, dev);
4064         else
4065                 bond_tx_drop(dev, skb);
4066         rcu_read_unlock();
4067 
4068         return ret;
4069 }
4070 
4071 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4072                                      struct ethtool_cmd *ecmd)
4073 {
4074         struct bonding *bond = netdev_priv(bond_dev);
4075         unsigned long speed = 0;
4076         struct list_head *iter;
4077         struct slave *slave;
4078 
4079         ecmd->duplex = DUPLEX_UNKNOWN;
4080         ecmd->port = PORT_OTHER;
4081 
4082         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4083          * do not need to check mode.  Though link speed might not represent
4084          * the true receive or transmit bandwidth (not all modes are symmetric)
4085          * this is an accurate maximum.
4086          */
4087         bond_for_each_slave(bond, slave, iter) {
4088                 if (bond_slave_can_tx(slave)) {
4089                         if (slave->speed != SPEED_UNKNOWN)
4090                                 speed += slave->speed;
4091                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
4092                             slave->duplex != DUPLEX_UNKNOWN)
4093                                 ecmd->duplex = slave->duplex;
4094                 }
4095         }
4096         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4097 
4098         return 0;
4099 }
4100 
4101 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4102                                      struct ethtool_drvinfo *drvinfo)
4103 {
4104         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4105         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4106         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4107                  BOND_ABI_VERSION);
4108 }
4109 
4110 static const struct ethtool_ops bond_ethtool_ops = {
4111         .get_drvinfo            = bond_ethtool_get_drvinfo,
4112         .get_settings           = bond_ethtool_get_settings,
4113         .get_link               = ethtool_op_get_link,
4114 };
4115 
4116 static const struct net_device_ops bond_netdev_ops = {
4117         .ndo_init               = bond_init,
4118         .ndo_uninit             = bond_uninit,
4119         .ndo_open               = bond_open,
4120         .ndo_stop               = bond_close,
4121         .ndo_start_xmit         = bond_start_xmit,
4122         .ndo_select_queue       = bond_select_queue,
4123         .ndo_get_stats64        = bond_get_stats,
4124         .ndo_do_ioctl           = bond_do_ioctl,
4125         .ndo_change_rx_flags    = bond_change_rx_flags,
4126         .ndo_set_rx_mode        = bond_set_rx_mode,
4127         .ndo_change_mtu         = bond_change_mtu,
4128         .ndo_set_mac_address    = bond_set_mac_address,
4129         .ndo_neigh_setup        = bond_neigh_setup,
4130         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4131         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4132 #ifdef CONFIG_NET_POLL_CONTROLLER
4133         .ndo_netpoll_setup      = bond_netpoll_setup,
4134         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4135         .ndo_poll_controller    = bond_poll_controller,
4136 #endif
4137         .ndo_add_slave          = bond_enslave,
4138         .ndo_del_slave          = bond_release,
4139         .ndo_fix_features       = bond_fix_features,
4140         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
4141         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
4142         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
4143         .ndo_fdb_add            = switchdev_port_fdb_add,
4144         .ndo_fdb_del            = switchdev_port_fdb_del,
4145         .ndo_fdb_dump           = switchdev_port_fdb_dump,
4146         .ndo_features_check     = passthru_features_check,
4147 };
4148 
4149 static const struct device_type bond_type = {
4150         .name = "bond",
4151 };
4152 
4153 static void bond_destructor(struct net_device *bond_dev)
4154 {
4155         struct bonding *bond = netdev_priv(bond_dev);
4156         if (bond->wq)
4157                 destroy_workqueue(bond->wq);
4158         free_netdev(bond_dev);
4159 }
4160 
4161 void bond_setup(struct net_device *bond_dev)
4162 {
4163         struct bonding *bond = netdev_priv(bond_dev);
4164 
4165         spin_lock_init(&bond->mode_lock);
4166         spin_lock_init(&bond->stats_lock);
4167         bond->params = bonding_defaults;
4168 
4169         /* Initialize pointers */
4170         bond->dev = bond_dev;
4171 
4172         /* Initialize the device entry points */
4173         ether_setup(bond_dev);
4174         bond_dev->netdev_ops = &bond_netdev_ops;
4175         bond_dev->ethtool_ops = &bond_ethtool_ops;
4176 
4177         bond_dev->destructor = bond_destructor;
4178 
4179         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4180 
4181         /* Initialize the device options */
4182         bond_dev->flags |= IFF_MASTER;
4183         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4184         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4185 
4186         /* don't acquire bond device's netif_tx_lock when transmitting */
4187         bond_dev->features |= NETIF_F_LLTX;
4188 
4189         /* By default, we declare the bond to be fully
4190          * VLAN hardware accelerated capable. Special
4191          * care is taken in the various xmit functions
4192          * when there are slaves that are not hw accel
4193          * capable
4194          */
4195 
4196         /* Don't allow bond devices to change network namespaces. */
4197         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4198 
4199         bond_dev->hw_features = BOND_VLAN_FEATURES |
4200                                 NETIF_F_HW_VLAN_CTAG_TX |
4201                                 NETIF_F_HW_VLAN_CTAG_RX |
4202                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4203 
4204         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4205         bond_dev->features |= bond_dev->hw_features;
4206 }
4207 
4208 /* Destroy a bonding device.
4209  * Must be under rtnl_lock when this function is called.
4210  */
4211 static void bond_uninit(struct net_device *bond_dev)
4212 {
4213         struct bonding *bond = netdev_priv(bond_dev);
4214         struct list_head *iter;
4215         struct slave *slave;
4216         struct bond_up_slave *arr;
4217 
4218         bond_netpoll_cleanup(bond_dev);
4219 
4220         /* Release the bonded slaves */
4221         bond_for_each_slave(bond, slave, iter)
4222                 __bond_release_one(bond_dev, slave->dev, true);
4223         netdev_info(bond_dev, "Released all slaves\n");
4224 
4225         arr = rtnl_dereference(bond->slave_arr);
4226         if (arr) {
4227                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4228                 kfree_rcu(arr, rcu);
4229         }
4230 
4231         list_del(&bond->bond_list);
4232 
4233         bond_debug_unregister(bond);
4234 }
4235 
4236 /*------------------------- Module initialization ---------------------------*/
4237 
4238 static int bond_check_params(struct bond_params *params)
4239 {
4240         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4241         struct bond_opt_value newval;
4242         const struct bond_opt_value *valptr;
4243         int arp_all_targets_value;
4244         u16 ad_actor_sys_prio = 0;
4245         u16 ad_user_port_key = 0;
4246 
4247         /* Convert string parameters. */
4248         if (mode) {
4249                 bond_opt_initstr(&newval, mode);
4250                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4251                 if (!valptr) {
4252                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4253                         return -EINVAL;
4254                 }
4255                 bond_mode = valptr->value;
4256         }
4257 
4258         if (xmit_hash_policy) {
4259                 if ((bond_mode != BOND_MODE_XOR) &&
4260                     (bond_mode != BOND_MODE_8023AD) &&
4261                     (bond_mode != BOND_MODE_TLB)) {
4262                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4263                                 bond_mode_name(bond_mode));
4264                 } else {
4265                         bond_opt_initstr(&newval, xmit_hash_policy);
4266                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4267                                                 &newval);
4268                         if (!valptr) {
4269                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4270                                        xmit_hash_policy);
4271                                 return -EINVAL;
4272                         }
4273                         xmit_hashtype = valptr->value;
4274                 }
4275         }
4276 
4277         if (lacp_rate) {
4278                 if (bond_mode != BOND_MODE_8023AD) {
4279                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4280                                 bond_mode_name(bond_mode));
4281                 } else {
4282                         bond_opt_initstr(&newval, lacp_rate);
4283                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4284                                                 &newval);
4285                         if (!valptr) {
4286                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4287                                        lacp_rate);
4288                                 return -EINVAL;
4289                         }
4290                         lacp_fast = valptr->value;
4291                 }
4292         }
4293 
4294         if (ad_select) {
4295                 bond_opt_initstr(&newval, ad_select);
4296                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4297                                         &newval);
4298                 if (!valptr) {
4299                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4300                         return -EINVAL;
4301                 }
4302                 params->ad_select = valptr->value;
4303                 if (bond_mode != BOND_MODE_8023AD)
4304                         pr_warn("ad_select param only affects 802.3ad mode\n");
4305         } else {
4306                 params->ad_select = BOND_AD_STABLE;
4307         }
4308 
4309         if (max_bonds < 0) {
4310                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4311                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4312                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4313         }
4314 
4315         if (miimon < 0) {
4316                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4317                         miimon, INT_MAX);
4318                 miimon = 0;
4319         }
4320 
4321         if (updelay < 0) {
4322                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4323                         updelay, INT_MAX);
4324                 updelay = 0;
4325         }
4326 
4327         if (downdelay < 0) {
4328                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4329                         downdelay, INT_MAX);
4330                 downdelay = 0;
4331         }
4332 
4333         if ((use_carrier != 0) && (use_carrier != 1)) {
4334                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4335                         use_carrier);
4336                 use_carrier = 1;
4337         }
4338 
4339         if (num_peer_notif < 0 || num_peer_notif > 255) {
4340                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4341                         num_peer_notif);
4342                 num_peer_notif = 1;
4343         }
4344 
4345         /* reset values for 802.3ad/TLB/ALB */
4346         if (!bond_mode_uses_arp(bond_mode)) {
4347                 if (!miimon) {
4348                         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");
4349                         pr_warn("Forcing miimon to 100msec\n");
4350                         miimon = BOND_DEFAULT_MIIMON;
4351                 }
4352         }
4353 
4354         if (tx_queues < 1 || tx_queues > 255) {
4355                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4356                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4357                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4358         }
4359 
4360         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4361                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4362                         all_slaves_active);
4363                 all_slaves_active = 0;
4364         }
4365 
4366         if (resend_igmp < 0 || resend_igmp > 255) {
4367                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4368                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4369                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4370         }
4371 
4372         bond_opt_initval(&newval, packets_per_slave);
4373         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4374                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4375                         packets_per_slave, USHRT_MAX);
4376                 packets_per_slave = 1;
4377         }
4378 
4379         if (bond_mode == BOND_MODE_ALB) {
4380                 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",
4381                           updelay);
4382         }
4383 
4384         if (!miimon) {
4385                 if (updelay || downdelay) {
4386                         /* just warn the user the up/down delay will have
4387                          * no effect since miimon is zero...
4388                          */
4389                         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",
4390                                 updelay, downdelay);
4391                 }
4392         } else {
4393                 /* don't allow arp monitoring */
4394                 if (arp_interval) {
4395                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4396                                 miimon, arp_interval);
4397                         arp_interval = 0;
4398                 }
4399 
4400                 if ((updelay % miimon) != 0) {
4401                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4402                                 updelay, miimon, (updelay / miimon) * miimon);
4403                 }
4404 
4405                 updelay /= miimon;
4406 
4407                 if ((downdelay % miimon) != 0) {
4408                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4409                                 downdelay, miimon,
4410                                 (downdelay / miimon) * miimon);
4411                 }
4412 
4413                 downdelay /= miimon;
4414         }
4415 
4416         if (arp_interval < 0) {
4417                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4418                         arp_interval, INT_MAX);
4419                 arp_interval = 0;
4420         }
4421 
4422         for (arp_ip_count = 0, i = 0;
4423              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4424                 __be32 ip;
4425 
4426                 /* not a complete check, but good enough to catch mistakes */
4427                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4428                     !bond_is_ip_target_ok(ip)) {
4429                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4430                                 arp_ip_target[i]);
4431                         arp_interval = 0;
4432                 } else {
4433                         if (bond_get_targets_ip(arp_target, ip) == -1)
4434                                 arp_target[arp_ip_count++] = ip;
4435                         else
4436                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4437                                         &ip);
4438                 }
4439         }
4440 
4441         if (arp_interval && !arp_ip_count) {
4442                 /* don't allow arping if no arp_ip_target given... */
4443                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4444                         arp_interval);
4445                 arp_interval = 0;
4446         }
4447 
4448         if (arp_validate) {
4449                 if (!arp_interval) {
4450                         pr_err("arp_validate requires arp_interval\n");
4451                         return -EINVAL;
4452                 }
4453 
4454                 bond_opt_initstr(&newval, arp_validate);
4455                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4456                                         &newval);
4457                 if (!valptr) {
4458                         pr_err("Error: invalid arp_validate \"%s\"\n",
4459                                arp_validate);
4460                         return -EINVAL;
4461                 }
4462                 arp_validate_value = valptr->value;
4463         } else {
4464                 arp_validate_value = 0;
4465         }
4466 
4467         arp_all_targets_value = 0;
4468         if (arp_all_targets) {
4469                 bond_opt_initstr(&newval, arp_all_targets);
4470                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4471                                         &newval);
4472                 if (!valptr) {
4473                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4474                                arp_all_targets);
4475                         arp_all_targets_value = 0;
4476                 } else {
4477                         arp_all_targets_value = valptr->value;
4478                 }
4479         }
4480 
4481         if (miimon) {
4482                 pr_info("MII link monitoring set to %d ms\n", miimon);
4483         } else if (arp_interval) {
4484                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4485                                           arp_validate_value);
4486                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4487                         arp_interval, valptr->string, arp_ip_count);
4488 
4489                 for (i = 0; i < arp_ip_count; i++)
4490                         pr_cont(" %s", arp_ip_target[i]);
4491 
4492                 pr_cont("\n");
4493 
4494         } else if (max_bonds) {
4495                 /* miimon and arp_interval not set, we need one so things
4496                  * work as expected, see bonding.txt for details
4497                  */
4498                 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");
4499         }
4500 
4501         if (primary && !bond_mode_uses_primary(bond_mode)) {
4502                 /* currently, using a primary only makes sense
4503                  * in active backup, TLB or ALB modes
4504                  */
4505                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4506                         primary, bond_mode_name(bond_mode));
4507                 primary = NULL;
4508         }
4509 
4510         if (primary && primary_reselect) {
4511                 bond_opt_initstr(&newval, primary_reselect);
4512                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4513                                         &newval);
4514                 if (!valptr) {
4515                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4516                                primary_reselect);
4517                         return -EINVAL;
4518                 }
4519                 primary_reselect_value = valptr->value;
4520         } else {
4521                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4522         }
4523 
4524         if (fail_over_mac) {
4525                 bond_opt_initstr(&newval, fail_over_mac);
4526                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4527                                         &newval);
4528                 if (!valptr) {
4529                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4530                                fail_over_mac);
4531                         return -EINVAL;
4532                 }
4533                 fail_over_mac_value = valptr->value;
4534                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4535                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4536         } else {
4537                 fail_over_mac_value = BOND_FOM_NONE;
4538         }
4539 
4540         bond_opt_initstr(&newval, "default");
4541         valptr = bond_opt_parse(
4542                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4543                                      &newval);
4544         if (!valptr) {
4545                 pr_err("Error: No ad_actor_sys_prio default value");
4546                 return -EINVAL;
4547         }
4548         ad_actor_sys_prio = valptr->value;
4549 
4550         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4551                                 &newval);
4552         if (!valptr) {
4553                 pr_err("Error: No ad_user_port_key default value");
4554                 return -EINVAL;
4555         }
4556         ad_user_port_key = valptr->value;
4557 
4558         if (lp_interval == 0) {
4559                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4560                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4561                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4562         }
4563 
4564         /* fill params struct with the proper values */
4565         params->mode = bond_mode;
4566         params->xmit_policy = xmit_hashtype;
4567         params->miimon = miimon;
4568         params->num_peer_notif = num_peer_notif;
4569         params->arp_interval = arp_interval;
4570         params->arp_validate = arp_validate_value;
4571         params->arp_all_targets = arp_all_targets_value;
4572         params->updelay = updelay;
4573         params->downdelay = downdelay;
4574         params->use_carrier = use_carrier;
4575         params->lacp_fast = lacp_fast;
4576         params->primary[0] = 0;
4577         params->primary_reselect = primary_reselect_value;
4578         params->fail_over_mac = fail_over_mac_value;
4579         params->tx_queues = tx_queues;
4580         params->all_slaves_active = all_slaves_active;
4581         params->resend_igmp = resend_igmp;
4582         params->min_links = min_links;
4583         params->lp_interval = lp_interval;
4584         params->packets_per_slave = packets_per_slave;
4585         params->tlb_dynamic_lb = 1; /* Default value */
4586         params->ad_actor_sys_prio = ad_actor_sys_prio;
4587         eth_zero_addr(params->ad_actor_system);
4588         params->ad_user_port_key = ad_user_port_key;
4589         if (packets_per_slave > 0) {
4590                 params->reciprocal_packets_per_slave =
4591                         reciprocal_value(packets_per_slave);
4592         } else {
4593                 /* reciprocal_packets_per_slave is unused if
4594                  * packets_per_slave is 0 or 1, just initialize it
4595                  */
4596                 params->reciprocal_packets_per_slave =
4597                         (struct reciprocal_value) { 0 };
4598         }
4599 
4600         if (primary) {
4601                 strncpy(params->primary, primary, IFNAMSIZ);
4602                 params->primary[IFNAMSIZ - 1] = 0;
4603         }
4604 
4605         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4606 
4607         return 0;
4608 }
4609 
4610 static struct lock_class_key bonding_netdev_xmit_lock_key;
4611 static struct lock_class_key bonding_netdev_addr_lock_key;
4612 static struct lock_class_key bonding_tx_busylock_key;
4613 
4614 static void bond_set_lockdep_class_one(struct net_device *dev,
4615                                        struct netdev_queue *txq,
4616                                        void *_unused)
4617 {
4618         lockdep_set_class(&txq->_xmit_lock,
4619                           &bonding_netdev_xmit_lock_key);
4620 }
4621 
4622 static void bond_set_lockdep_class(struct net_device *dev)
4623 {
4624         lockdep_set_class(&dev->addr_list_lock,
4625                           &bonding_netdev_addr_lock_key);
4626         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4627         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4628 }
4629 
4630 /* Called from registration process */
4631 static int bond_init(struct net_device *bond_dev)
4632 {
4633         struct bonding *bond = netdev_priv(bond_dev);
4634         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4635 
4636         netdev_dbg(bond_dev, "Begin bond_init\n");
4637 
4638         bond->wq = create_singlethread_workqueue(bond_dev->name);
4639         if (!bond->wq)
4640                 return -ENOMEM;
4641 
4642         bond_set_lockdep_class(bond_dev);
4643 
4644         list_add_tail(&bond->bond_list, &bn->dev_list);
4645 
4646         bond_prepare_sysfs_group(bond);
4647 
4648         bond_debug_register(bond);
4649 
4650         /* Ensure valid dev_addr */
4651         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4652             bond_dev->addr_assign_type == NET_ADDR_PERM)
4653                 eth_hw_addr_random(bond_dev);
4654 
4655         return 0;
4656 }
4657 
4658 unsigned int bond_get_num_tx_queues(void)
4659 {
4660         return tx_queues;
4661 }
4662 
4663 /* Create a new bond based on the specified name and bonding parameters.
4664  * If name is NULL, obtain a suitable "bond%d" name for us.
4665  * Caller must NOT hold rtnl_lock; we need to release it here before we
4666  * set up our sysfs entries.
4667  */
4668 int bond_create(struct net *net, const char *name)
4669 {
4670         struct net_device *bond_dev;
4671         struct bonding *bond;
4672         struct alb_bond_info *bond_info;
4673         int res;
4674 
4675         rtnl_lock();
4676 
4677         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4678                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4679                                    bond_setup, tx_queues);
4680         if (!bond_dev) {
4681                 pr_err("%s: eek! can't alloc netdev!\n", name);
4682                 rtnl_unlock();
4683                 return -ENOMEM;
4684         }
4685 
4686         /*
4687          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4688          * It is set to 0 by default which is wrong.
4689          */
4690         bond = netdev_priv(bond_dev);
4691         bond_info = &(BOND_ALB_INFO(bond));
4692         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4693 
4694         dev_net_set(bond_dev, net);
4695         bond_dev->rtnl_link_ops = &bond_link_ops;
4696 
4697         res = register_netdevice(bond_dev);
4698 
4699         netif_carrier_off(bond_dev);
4700 
4701         rtnl_unlock();
4702         if (res < 0)
4703                 bond_destructor(bond_dev);
4704         return res;
4705 }
4706 
4707 static int __net_init bond_net_init(struct net *net)
4708 {
4709         struct bond_net *bn = net_generic(net, bond_net_id);
4710 
4711         bn->net = net;
4712         INIT_LIST_HEAD(&bn->dev_list);
4713 
4714         bond_create_proc_dir(bn);
4715         bond_create_sysfs(bn);
4716 
4717         return 0;
4718 }
4719 
4720 static void __net_exit bond_net_exit(struct net *net)
4721 {
4722         struct bond_net *bn = net_generic(net, bond_net_id);
4723         struct bonding *bond, *tmp_bond;
4724         LIST_HEAD(list);
4725 
4726         bond_destroy_sysfs(bn);
4727 
4728         /* Kill off any bonds created after unregistering bond rtnl ops */
4729         rtnl_lock();
4730         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4731                 unregister_netdevice_queue(bond->dev, &list);
4732         unregister_netdevice_many(&list);
4733         rtnl_unlock();
4734 
4735         bond_destroy_proc_dir(bn);
4736 }
4737 
4738 static struct pernet_operations bond_net_ops = {
4739         .init = bond_net_init,
4740         .exit = bond_net_exit,
4741         .id   = &bond_net_id,
4742         .size = sizeof(struct bond_net),
4743 };
4744 
4745 static int __init bonding_init(void)
4746 {
4747         int i;
4748         int res;
4749 
4750         pr_info("%s", bond_version);
4751 
4752         res = bond_check_params(&bonding_defaults);
4753         if (res)
4754                 goto out;
4755 
4756         res = register_pernet_subsys(&bond_net_ops);
4757         if (res)
4758                 goto out;
4759 
4760         res = bond_netlink_init();
4761         if (res)
4762                 goto err_link;
4763 
4764         bond_create_debugfs();
4765 
4766         for (i = 0; i < max_bonds; i++) {
4767                 res = bond_create(&init_net, NULL);
4768                 if (res)
4769                         goto err;
4770         }
4771 
4772         register_netdevice_notifier(&bond_netdev_notifier);
4773 out:
4774         return res;
4775 err:
4776         bond_destroy_debugfs();
4777         bond_netlink_fini();
4778 err_link:
4779         unregister_pernet_subsys(&bond_net_ops);
4780         goto out;
4781 
4782 }
4783 
4784 static void __exit bonding_exit(void)
4785 {
4786         unregister_netdevice_notifier(&bond_netdev_notifier);
4787 
4788         bond_destroy_debugfs();
4789 
4790         bond_netlink_fini();
4791         unregister_pernet_subsys(&bond_net_ops);
4792 
4793 #ifdef CONFIG_NET_POLL_CONTROLLER
4794         /* Make sure we don't have an imbalance on our netpoll blocking */
4795         WARN_ON(atomic_read(&netpoll_block_tx));
4796 #endif
4797 }
4798 
4799 module_init(bonding_init);
4800 module_exit(bonding_exit);
4801 MODULE_LICENSE("GPL");
4802 MODULE_VERSION(DRV_VERSION);
4803 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4804 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4805 

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