Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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_keys.h>
 80 #include "bonding.h"
 81 #include "bond_3ad.h"
 82 #include "bond_alb.h"
 83 
 84 /*---------------------------- Module parameters ----------------------------*/
 85 
 86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
 87 
 88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 89 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 90 static int num_peer_notif = 1;
 91 static int miimon;
 92 static int updelay;
 93 static int downdelay;
 94 static int use_carrier  = 1;
 95 static char *mode;
 96 static char *primary;
 97 static char *primary_reselect;
 98 static char *lacp_rate;
 99 static int min_links;
100 static char *ad_select;
101 static char *xmit_hash_policy;
102 static int arp_interval;
103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
104 static char *arp_validate;
105 static char *arp_all_targets;
106 static char *fail_over_mac;
107 static int all_slaves_active;
108 static struct bond_params bonding_defaults;
109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
110 static int packets_per_slave = 1;
111 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
112 
113 module_param(max_bonds, int, 0);
114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
115 module_param(tx_queues, int, 0);
116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
117 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
119                                "failover event (alias of num_unsol_na)");
120 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
122                                "failover event (alias of num_grat_arp)");
123 module_param(miimon, int, 0);
124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
125 module_param(updelay, int, 0);
126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
127 module_param(downdelay, int, 0);
128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
129                             "in milliseconds");
130 module_param(use_carrier, int, 0);
131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
132                               "0 for off, 1 for on (default)");
133 module_param(mode, charp, 0);
134 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
135                        "1 for active-backup, 2 for balance-xor, "
136                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
137                        "6 for balance-alb");
138 module_param(primary, charp, 0);
139 MODULE_PARM_DESC(primary, "Primary network device to use");
140 module_param(primary_reselect, charp, 0);
141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
142                                    "once it comes up; "
143                                    "0 for always (default), "
144                                    "1 for only if speed of primary is "
145                                    "better, "
146                                    "2 for only on active slave "
147                                    "failure");
148 module_param(lacp_rate, charp, 0);
149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
150                             "0 for slow, 1 for fast");
151 module_param(ad_select, charp, 0);
152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
153                             "0 for stable (default), 1 for bandwidth, "
154                             "2 for count");
155 module_param(min_links, int, 0);
156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
157 
158 module_param(xmit_hash_policy, charp, 0);
159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
160                                    "0 for layer 2 (default), 1 for layer 3+4, "
161                                    "2 for layer 2+3, 3 for encap layer 2+3, "
162                                    "4 for encap layer 3+4");
163 module_param(arp_interval, int, 0);
164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
165 module_param_array(arp_ip_target, charp, NULL, 0);
166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
167 module_param(arp_validate, charp, 0);
168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
169                                "0 for none (default), 1 for active, "
170                                "2 for backup, 3 for all");
171 module_param(arp_all_targets, charp, 0);
172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
173 module_param(fail_over_mac, charp, 0);
174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
175                                 "the same MAC; 0 for none (default), "
176                                 "1 for active, 2 for follow");
177 module_param(all_slaves_active, int, 0);
178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
179                                      "by setting active flag for all slaves; "
180                                      "0 for never (default), 1 for always.");
181 module_param(resend_igmp, int, 0);
182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
183                               "link failure");
184 module_param(packets_per_slave, int, 0);
185 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
186                                     "mode; 0 for a random slave, 1 packet per "
187                                     "slave (default), >1 packets per slave.");
188 module_param(lp_interval, uint, 0);
189 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
190                               "the bonding driver sends learning packets to "
191                               "each slaves peer switch. The default is 1.");
192 
193 /*----------------------------- Global variables ----------------------------*/
194 
195 #ifdef CONFIG_NET_POLL_CONTROLLER
196 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
197 #endif
198 
199 int bond_net_id __read_mostly;
200 
201 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
202 static int arp_ip_count;
203 static int bond_mode    = BOND_MODE_ROUNDROBIN;
204 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
205 static int lacp_fast;
206 
207 /*-------------------------- Forward declarations ---------------------------*/
208 
209 static int bond_init(struct net_device *bond_dev);
210 static void bond_uninit(struct net_device *bond_dev);
211 
212 /*---------------------------- General routines -----------------------------*/
213 
214 const char *bond_mode_name(int mode)
215 {
216         static const char *names[] = {
217                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
218                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
219                 [BOND_MODE_XOR] = "load balancing (xor)",
220                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
221                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
222                 [BOND_MODE_TLB] = "transmit load balancing",
223                 [BOND_MODE_ALB] = "adaptive load balancing",
224         };
225 
226         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
227                 return "unknown";
228 
229         return names[mode];
230 }
231 
232 /*---------------------------------- VLAN -----------------------------------*/
233 
234 /**
235  * bond_dev_queue_xmit - Prepare skb for xmit.
236  *
237  * @bond: bond device that got this skb for tx.
238  * @skb: hw accel VLAN tagged skb to transmit
239  * @slave_dev: slave that is supposed to xmit this skbuff
240  */
241 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
242                         struct net_device *slave_dev)
243 {
244         skb->dev = slave_dev;
245 
246         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
247                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
248         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
249 
250         if (unlikely(netpoll_tx_running(bond->dev)))
251                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
252         else
253                 dev_queue_xmit(skb);
254 }
255 
256 /*
257  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
258  * We don't protect the slave list iteration with a lock because:
259  * a. This operation is performed in IOCTL context,
260  * b. The operation is protected by the RTNL semaphore in the 8021q code,
261  * c. Holding a lock with BH disabled while directly calling a base driver
262  *    entry point is generally a BAD idea.
263  *
264  * The design of synchronization/protection for this operation in the 8021q
265  * module is good for one or more VLAN devices over a single physical device
266  * and cannot be extended for a teaming solution like bonding, so there is a
267  * potential race condition here where a net device from the vlan group might
268  * be referenced (either by a base driver or the 8021q code) while it is being
269  * removed from the system. However, it turns out we're not making matters
270  * worse, and if it works for regular VLAN usage it will work here too.
271 */
272 
273 /**
274  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
275  * @bond_dev: bonding net device that got called
276  * @vid: vlan id being added
277  */
278 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
279                                 __be16 proto, u16 vid)
280 {
281         struct bonding *bond = netdev_priv(bond_dev);
282         struct slave *slave, *rollback_slave;
283         struct list_head *iter;
284         int res;
285 
286         bond_for_each_slave(bond, slave, iter) {
287                 res = vlan_vid_add(slave->dev, proto, vid);
288                 if (res)
289                         goto unwind;
290         }
291 
292         return 0;
293 
294 unwind:
295         /* unwind to the slave that failed */
296         bond_for_each_slave(bond, rollback_slave, iter) {
297                 if (rollback_slave == slave)
298                         break;
299 
300                 vlan_vid_del(rollback_slave->dev, proto, vid);
301         }
302 
303         return res;
304 }
305 
306 /**
307  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
308  * @bond_dev: bonding net device that got called
309  * @vid: vlan id being removed
310  */
311 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
312                                  __be16 proto, u16 vid)
313 {
314         struct bonding *bond = netdev_priv(bond_dev);
315         struct list_head *iter;
316         struct slave *slave;
317 
318         bond_for_each_slave(bond, slave, iter)
319                 vlan_vid_del(slave->dev, proto, vid);
320 
321         if (bond_is_lb(bond))
322                 bond_alb_clear_vlan(bond, vid);
323 
324         return 0;
325 }
326 
327 /*------------------------------- Link status -------------------------------*/
328 
329 /*
330  * Set the carrier state for the master according to the state of its
331  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
332  * do special 802.3ad magic.
333  *
334  * Returns zero if carrier state does not change, nonzero if it does.
335  */
336 static int bond_set_carrier(struct bonding *bond)
337 {
338         struct list_head *iter;
339         struct slave *slave;
340 
341         if (!bond_has_slaves(bond))
342                 goto down;
343 
344         if (BOND_MODE(bond) == BOND_MODE_8023AD)
345                 return bond_3ad_set_carrier(bond);
346 
347         bond_for_each_slave(bond, slave, iter) {
348                 if (slave->link == BOND_LINK_UP) {
349                         if (!netif_carrier_ok(bond->dev)) {
350                                 netif_carrier_on(bond->dev);
351                                 return 1;
352                         }
353                         return 0;
354                 }
355         }
356 
357 down:
358         if (netif_carrier_ok(bond->dev)) {
359                 netif_carrier_off(bond->dev);
360                 return 1;
361         }
362         return 0;
363 }
364 
365 /*
366  * Get link speed and duplex from the slave's base driver
367  * using ethtool. If for some reason the call fails or the
368  * values are invalid, set speed and duplex to -1,
369  * and return.
370  */
371 static void bond_update_speed_duplex(struct slave *slave)
372 {
373         struct net_device *slave_dev = slave->dev;
374         struct ethtool_cmd ecmd;
375         u32 slave_speed;
376         int res;
377 
378         slave->speed = SPEED_UNKNOWN;
379         slave->duplex = DUPLEX_UNKNOWN;
380 
381         res = __ethtool_get_settings(slave_dev, &ecmd);
382         if (res < 0)
383                 return;
384 
385         slave_speed = ethtool_cmd_speed(&ecmd);
386         if (slave_speed == 0 || slave_speed == ((__u32) -1))
387                 return;
388 
389         switch (ecmd.duplex) {
390         case DUPLEX_FULL:
391         case DUPLEX_HALF:
392                 break;
393         default:
394                 return;
395         }
396 
397         slave->speed = slave_speed;
398         slave->duplex = ecmd.duplex;
399 
400         return;
401 }
402 
403 const char *bond_slave_link_status(s8 link)
404 {
405         switch (link) {
406         case BOND_LINK_UP:
407                 return "up";
408         case BOND_LINK_FAIL:
409                 return "going down";
410         case BOND_LINK_DOWN:
411                 return "down";
412         case BOND_LINK_BACK:
413                 return "going back";
414         default:
415                 return "unknown";
416         }
417 }
418 
419 /*
420  * if <dev> supports MII link status reporting, check its link status.
421  *
422  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
423  * depending upon the setting of the use_carrier parameter.
424  *
425  * Return either BMSR_LSTATUS, meaning that the link is up (or we
426  * can't tell and just pretend it is), or 0, meaning that the link is
427  * down.
428  *
429  * If reporting is non-zero, instead of faking link up, return -1 if
430  * both ETHTOOL and MII ioctls fail (meaning the device does not
431  * support them).  If use_carrier is set, return whatever it says.
432  * It'd be nice if there was a good way to tell if a driver supports
433  * netif_carrier, but there really isn't.
434  */
435 static int bond_check_dev_link(struct bonding *bond,
436                                struct net_device *slave_dev, int reporting)
437 {
438         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
439         int (*ioctl)(struct net_device *, struct ifreq *, int);
440         struct ifreq ifr;
441         struct mii_ioctl_data *mii;
442 
443         if (!reporting && !netif_running(slave_dev))
444                 return 0;
445 
446         if (bond->params.use_carrier)
447                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
448 
449         /* Try to get link status using Ethtool first. */
450         if (slave_dev->ethtool_ops->get_link)
451                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
452                         BMSR_LSTATUS : 0;
453 
454         /* Ethtool can't be used, fallback to MII ioctls. */
455         ioctl = slave_ops->ndo_do_ioctl;
456         if (ioctl) {
457                 /* TODO: set pointer to correct ioctl on a per team member */
458                 /*       bases to make this more efficient. that is, once  */
459                 /*       we determine the correct ioctl, we will always    */
460                 /*       call it and not the others for that team          */
461                 /*       member.                                           */
462 
463                 /*
464                  * We cannot assume that SIOCGMIIPHY will also read a
465                  * register; not all network drivers (e.g., e100)
466                  * support that.
467                  */
468 
469                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
470                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
471                 mii = if_mii(&ifr);
472                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
473                         mii->reg_num = MII_BMSR;
474                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
475                                 return mii->val_out & BMSR_LSTATUS;
476                 }
477         }
478 
479         /*
480          * If reporting, report that either there's no dev->do_ioctl,
481          * or both SIOCGMIIREG and get_link failed (meaning that we
482          * cannot report link status).  If not reporting, pretend
483          * we're ok.
484          */
485         return reporting ? -1 : BMSR_LSTATUS;
486 }
487 
488 /*----------------------------- Multicast list ------------------------------*/
489 
490 /*
491  * Push the promiscuity flag down to appropriate slaves
492  */
493 static int bond_set_promiscuity(struct bonding *bond, int inc)
494 {
495         struct list_head *iter;
496         int err = 0;
497 
498         if (bond_uses_primary(bond)) {
499                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
500 
501                 if (curr_active)
502                         err = dev_set_promiscuity(curr_active->dev, inc);
503         } else {
504                 struct slave *slave;
505 
506                 bond_for_each_slave(bond, slave, iter) {
507                         err = dev_set_promiscuity(slave->dev, inc);
508                         if (err)
509                                 return err;
510                 }
511         }
512         return err;
513 }
514 
515 /*
516  * Push the allmulti flag down to all slaves
517  */
518 static int bond_set_allmulti(struct bonding *bond, int inc)
519 {
520         struct list_head *iter;
521         int err = 0;
522 
523         if (bond_uses_primary(bond)) {
524                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
525 
526                 if (curr_active)
527                         err = dev_set_allmulti(curr_active->dev, inc);
528         } else {
529                 struct slave *slave;
530 
531                 bond_for_each_slave(bond, slave, iter) {
532                         err = dev_set_allmulti(slave->dev, inc);
533                         if (err)
534                                 return err;
535                 }
536         }
537         return err;
538 }
539 
540 /*
541  * Retrieve the list of registered multicast addresses for the bonding
542  * device and retransmit an IGMP JOIN request to the current active
543  * slave.
544  */
545 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
546 {
547         struct bonding *bond = container_of(work, struct bonding,
548                                             mcast_work.work);
549 
550         if (!rtnl_trylock()) {
551                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
552                 return;
553         }
554         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
555 
556         if (bond->igmp_retrans > 1) {
557                 bond->igmp_retrans--;
558                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
559         }
560         rtnl_unlock();
561 }
562 
563 /* Flush bond's hardware addresses from slave
564  */
565 static void bond_hw_addr_flush(struct net_device *bond_dev,
566                                struct net_device *slave_dev)
567 {
568         struct bonding *bond = netdev_priv(bond_dev);
569 
570         dev_uc_unsync(slave_dev, bond_dev);
571         dev_mc_unsync(slave_dev, bond_dev);
572 
573         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
574                 /* del lacpdu mc addr from mc list */
575                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
576 
577                 dev_mc_del(slave_dev, lacpdu_multicast);
578         }
579 }
580 
581 /*--------------------------- Active slave change ---------------------------*/
582 
583 /* Update the hardware address list and promisc/allmulti for the new and
584  * old active slaves (if any).  Modes that are not using primary keep all
585  * slaves up date at all times; only the modes that use primary need to call
586  * this function to swap these settings during a failover.
587  */
588 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
589                               struct slave *old_active)
590 {
591         ASSERT_RTNL();
592 
593         if (old_active) {
594                 if (bond->dev->flags & IFF_PROMISC)
595                         dev_set_promiscuity(old_active->dev, -1);
596 
597                 if (bond->dev->flags & IFF_ALLMULTI)
598                         dev_set_allmulti(old_active->dev, -1);
599 
600                 bond_hw_addr_flush(bond->dev, old_active->dev);
601         }
602 
603         if (new_active) {
604                 /* FIXME: Signal errors upstream. */
605                 if (bond->dev->flags & IFF_PROMISC)
606                         dev_set_promiscuity(new_active->dev, 1);
607 
608                 if (bond->dev->flags & IFF_ALLMULTI)
609                         dev_set_allmulti(new_active->dev, 1);
610 
611                 netif_addr_lock_bh(bond->dev);
612                 dev_uc_sync(new_active->dev, bond->dev);
613                 dev_mc_sync(new_active->dev, bond->dev);
614                 netif_addr_unlock_bh(bond->dev);
615         }
616 }
617 
618 /**
619  * bond_set_dev_addr - clone slave's address to bond
620  * @bond_dev: bond net device
621  * @slave_dev: slave net device
622  *
623  * Should be called with RTNL held.
624  */
625 static void bond_set_dev_addr(struct net_device *bond_dev,
626                               struct net_device *slave_dev)
627 {
628         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
629                    bond_dev, slave_dev, slave_dev->addr_len);
630         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
631         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
632         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
633 }
634 
635 /*
636  * bond_do_fail_over_mac
637  *
638  * Perform special MAC address swapping for fail_over_mac settings
639  *
640  * Called with RTNL, curr_slave_lock for write_bh.
641  */
642 static void bond_do_fail_over_mac(struct bonding *bond,
643                                   struct slave *new_active,
644                                   struct slave *old_active)
645         __releases(&bond->curr_slave_lock)
646         __acquires(&bond->curr_slave_lock)
647 {
648         u8 tmp_mac[ETH_ALEN];
649         struct sockaddr saddr;
650         int rv;
651 
652         switch (bond->params.fail_over_mac) {
653         case BOND_FOM_ACTIVE:
654                 if (new_active) {
655                         write_unlock_bh(&bond->curr_slave_lock);
656                         bond_set_dev_addr(bond->dev, new_active->dev);
657                         write_lock_bh(&bond->curr_slave_lock);
658                 }
659                 break;
660         case BOND_FOM_FOLLOW:
661                 /*
662                  * if new_active && old_active, swap them
663                  * if just old_active, do nothing (going to no active slave)
664                  * if just new_active, set new_active to bond's MAC
665                  */
666                 if (!new_active)
667                         return;
668 
669                 write_unlock_bh(&bond->curr_slave_lock);
670 
671                 if (old_active) {
672                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
673                         ether_addr_copy(saddr.sa_data,
674                                         old_active->dev->dev_addr);
675                         saddr.sa_family = new_active->dev->type;
676                 } else {
677                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
678                         saddr.sa_family = bond->dev->type;
679                 }
680 
681                 rv = dev_set_mac_address(new_active->dev, &saddr);
682                 if (rv) {
683                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
684                                    -rv, new_active->dev->name);
685                         goto out;
686                 }
687 
688                 if (!old_active)
689                         goto out;
690 
691                 ether_addr_copy(saddr.sa_data, tmp_mac);
692                 saddr.sa_family = old_active->dev->type;
693 
694                 rv = dev_set_mac_address(old_active->dev, &saddr);
695                 if (rv)
696                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
697                                    -rv, new_active->dev->name);
698 out:
699                 write_lock_bh(&bond->curr_slave_lock);
700                 break;
701         default:
702                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
703                            bond->params.fail_over_mac);
704                 break;
705         }
706 
707 }
708 
709 static bool bond_should_change_active(struct bonding *bond)
710 {
711         struct slave *prim = bond->primary_slave;
712         struct slave *curr = bond_deref_active_protected(bond);
713 
714         if (!prim || !curr || curr->link != BOND_LINK_UP)
715                 return true;
716         if (bond->force_primary) {
717                 bond->force_primary = false;
718                 return true;
719         }
720         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
721             (prim->speed < curr->speed ||
722              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
723                 return false;
724         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
725                 return false;
726         return true;
727 }
728 
729 /**
730  * find_best_interface - select the best available slave to be the active one
731  * @bond: our bonding struct
732  */
733 static struct slave *bond_find_best_slave(struct bonding *bond)
734 {
735         struct slave *slave, *bestslave = NULL;
736         struct list_head *iter;
737         int mintime = bond->params.updelay;
738 
739         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
740             bond_should_change_active(bond))
741                 return bond->primary_slave;
742 
743         bond_for_each_slave(bond, slave, iter) {
744                 if (slave->link == BOND_LINK_UP)
745                         return slave;
746                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
747                     slave->delay < mintime) {
748                         mintime = slave->delay;
749                         bestslave = slave;
750                 }
751         }
752 
753         return bestslave;
754 }
755 
756 static bool bond_should_notify_peers(struct bonding *bond)
757 {
758         struct slave *slave;
759 
760         rcu_read_lock();
761         slave = rcu_dereference(bond->curr_active_slave);
762         rcu_read_unlock();
763 
764         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
765                    slave ? slave->dev->name : "NULL");
766 
767         if (!slave || !bond->send_peer_notif ||
768             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
769                 return false;
770 
771         return true;
772 }
773 
774 /**
775  * change_active_interface - change the active slave into the specified one
776  * @bond: our bonding struct
777  * @new: the new slave to make the active one
778  *
779  * Set the new slave to the bond's settings and unset them on the old
780  * curr_active_slave.
781  * Setting include flags, mc-list, promiscuity, allmulti, etc.
782  *
783  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
784  * because it is apparently the best available slave we have, even though its
785  * updelay hasn't timed out yet.
786  *
787  * If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
788  */
789 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
790 {
791         struct slave *old_active;
792 
793         old_active = rcu_dereference_protected(bond->curr_active_slave,
794                                                !new_active ||
795                                                lockdep_is_held(&bond->curr_slave_lock));
796 
797         if (old_active == new_active)
798                 return;
799 
800         if (new_active) {
801                 new_active->last_link_up = jiffies;
802 
803                 if (new_active->link == BOND_LINK_BACK) {
804                         if (bond_uses_primary(bond)) {
805                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
806                                             new_active->dev->name,
807                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
808                         }
809 
810                         new_active->delay = 0;
811                         new_active->link = BOND_LINK_UP;
812 
813                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
814                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
815 
816                         if (bond_is_lb(bond))
817                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
818                 } else {
819                         if (bond_uses_primary(bond)) {
820                                 netdev_info(bond->dev, "making interface %s the new active one\n",
821                                             new_active->dev->name);
822                         }
823                 }
824         }
825 
826         if (bond_uses_primary(bond))
827                 bond_hw_addr_swap(bond, new_active, old_active);
828 
829         if (bond_is_lb(bond)) {
830                 bond_alb_handle_active_change(bond, new_active);
831                 if (old_active)
832                         bond_set_slave_inactive_flags(old_active,
833                                                       BOND_SLAVE_NOTIFY_NOW);
834                 if (new_active)
835                         bond_set_slave_active_flags(new_active,
836                                                     BOND_SLAVE_NOTIFY_NOW);
837         } else {
838                 rcu_assign_pointer(bond->curr_active_slave, new_active);
839         }
840 
841         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
842                 if (old_active)
843                         bond_set_slave_inactive_flags(old_active,
844                                                       BOND_SLAVE_NOTIFY_NOW);
845 
846                 if (new_active) {
847                         bool should_notify_peers = false;
848 
849                         bond_set_slave_active_flags(new_active,
850                                                     BOND_SLAVE_NOTIFY_NOW);
851 
852                         if (bond->params.fail_over_mac)
853                                 bond_do_fail_over_mac(bond, new_active,
854                                                       old_active);
855 
856                         if (netif_running(bond->dev)) {
857                                 bond->send_peer_notif =
858                                         bond->params.num_peer_notif;
859                                 should_notify_peers =
860                                         bond_should_notify_peers(bond);
861                         }
862 
863                         write_unlock_bh(&bond->curr_slave_lock);
864 
865                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
866                         if (should_notify_peers)
867                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
868                                                          bond->dev);
869 
870                         write_lock_bh(&bond->curr_slave_lock);
871                 }
872         }
873 
874         /* resend IGMP joins since active slave has changed or
875          * all were sent on curr_active_slave.
876          * resend only if bond is brought up with the affected
877          * bonding modes and the retransmission is enabled */
878         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
879             ((bond_uses_primary(bond) && new_active) ||
880              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
881                 bond->igmp_retrans = bond->params.resend_igmp;
882                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
883         }
884 }
885 
886 /**
887  * bond_select_active_slave - select a new active slave, if needed
888  * @bond: our bonding struct
889  *
890  * This functions should be called when one of the following occurs:
891  * - The old curr_active_slave has been released or lost its link.
892  * - The primary_slave has got its link back.
893  * - A slave has got its link back and there's no old curr_active_slave.
894  *
895  * Caller must hold curr_slave_lock for write_bh.
896  */
897 void bond_select_active_slave(struct bonding *bond)
898 {
899         struct slave *best_slave;
900         int rv;
901 
902         best_slave = bond_find_best_slave(bond);
903         if (best_slave != bond_deref_active_protected(bond)) {
904                 bond_change_active_slave(bond, best_slave);
905                 rv = bond_set_carrier(bond);
906                 if (!rv)
907                         return;
908 
909                 if (netif_carrier_ok(bond->dev)) {
910                         netdev_info(bond->dev, "first active interface up!\n");
911                 } else {
912                         netdev_info(bond->dev, "now running without any active interface!\n");
913                 }
914         }
915 }
916 
917 #ifdef CONFIG_NET_POLL_CONTROLLER
918 static inline int slave_enable_netpoll(struct slave *slave)
919 {
920         struct netpoll *np;
921         int err = 0;
922 
923         np = kzalloc(sizeof(*np), GFP_KERNEL);
924         err = -ENOMEM;
925         if (!np)
926                 goto out;
927 
928         err = __netpoll_setup(np, slave->dev);
929         if (err) {
930                 kfree(np);
931                 goto out;
932         }
933         slave->np = np;
934 out:
935         return err;
936 }
937 static inline void slave_disable_netpoll(struct slave *slave)
938 {
939         struct netpoll *np = slave->np;
940 
941         if (!np)
942                 return;
943 
944         slave->np = NULL;
945         __netpoll_free_async(np);
946 }
947 
948 static void bond_poll_controller(struct net_device *bond_dev)
949 {
950 }
951 
952 static void bond_netpoll_cleanup(struct net_device *bond_dev)
953 {
954         struct bonding *bond = netdev_priv(bond_dev);
955         struct list_head *iter;
956         struct slave *slave;
957 
958         bond_for_each_slave(bond, slave, iter)
959                 if (bond_slave_is_up(slave))
960                         slave_disable_netpoll(slave);
961 }
962 
963 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
964 {
965         struct bonding *bond = netdev_priv(dev);
966         struct list_head *iter;
967         struct slave *slave;
968         int err = 0;
969 
970         bond_for_each_slave(bond, slave, iter) {
971                 err = slave_enable_netpoll(slave);
972                 if (err) {
973                         bond_netpoll_cleanup(dev);
974                         break;
975                 }
976         }
977         return err;
978 }
979 #else
980 static inline int slave_enable_netpoll(struct slave *slave)
981 {
982         return 0;
983 }
984 static inline void slave_disable_netpoll(struct slave *slave)
985 {
986 }
987 static void bond_netpoll_cleanup(struct net_device *bond_dev)
988 {
989 }
990 #endif
991 
992 /*---------------------------------- IOCTL ----------------------------------*/
993 
994 static netdev_features_t bond_fix_features(struct net_device *dev,
995                                            netdev_features_t features)
996 {
997         struct bonding *bond = netdev_priv(dev);
998         struct list_head *iter;
999         netdev_features_t mask;
1000         struct slave *slave;
1001 
1002         mask = features;
1003         features &= ~NETIF_F_ONE_FOR_ALL;
1004         features |= NETIF_F_ALL_FOR_ALL;
1005 
1006         bond_for_each_slave(bond, slave, iter) {
1007                 features = netdev_increment_features(features,
1008                                                      slave->dev->features,
1009                                                      mask);
1010         }
1011         features = netdev_add_tso_features(features, mask);
1012 
1013         return features;
1014 }
1015 
1016 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1017                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1018                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1019 
1020 #define BOND_ENC_FEATURES       (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1021                                  NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL)
1022 
1023 static void bond_compute_features(struct bonding *bond)
1024 {
1025         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1026         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1027         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1028         struct net_device *bond_dev = bond->dev;
1029         struct list_head *iter;
1030         struct slave *slave;
1031         unsigned short max_hard_header_len = ETH_HLEN;
1032         unsigned int gso_max_size = GSO_MAX_SIZE;
1033         u16 gso_max_segs = GSO_MAX_SEGS;
1034 
1035         if (!bond_has_slaves(bond))
1036                 goto done;
1037         vlan_features &= NETIF_F_ALL_FOR_ALL;
1038 
1039         bond_for_each_slave(bond, slave, iter) {
1040                 vlan_features = netdev_increment_features(vlan_features,
1041                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1042 
1043                 enc_features = netdev_increment_features(enc_features,
1044                                                          slave->dev->hw_enc_features,
1045                                                          BOND_ENC_FEATURES);
1046                 dst_release_flag &= slave->dev->priv_flags;
1047                 if (slave->dev->hard_header_len > max_hard_header_len)
1048                         max_hard_header_len = slave->dev->hard_header_len;
1049 
1050                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1051                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1052         }
1053 
1054 done:
1055         bond_dev->vlan_features = vlan_features;
1056         bond_dev->hw_enc_features = enc_features;
1057         bond_dev->hard_header_len = max_hard_header_len;
1058         bond_dev->gso_max_segs = gso_max_segs;
1059         netif_set_gso_max_size(bond_dev, gso_max_size);
1060 
1061         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1062         bond_dev->priv_flags = flags | dst_release_flag;
1063 
1064         netdev_change_features(bond_dev);
1065 }
1066 
1067 static void bond_setup_by_slave(struct net_device *bond_dev,
1068                                 struct net_device *slave_dev)
1069 {
1070         bond_dev->header_ops        = slave_dev->header_ops;
1071 
1072         bond_dev->type              = slave_dev->type;
1073         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1074         bond_dev->addr_len          = slave_dev->addr_len;
1075 
1076         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1077                 slave_dev->addr_len);
1078 }
1079 
1080 /* On bonding slaves other than the currently active slave, suppress
1081  * duplicates except for alb non-mcast/bcast.
1082  */
1083 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1084                                             struct slave *slave,
1085                                             struct bonding *bond)
1086 {
1087         if (bond_is_slave_inactive(slave)) {
1088                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1089                     skb->pkt_type != PACKET_BROADCAST &&
1090                     skb->pkt_type != PACKET_MULTICAST)
1091                         return false;
1092                 return true;
1093         }
1094         return false;
1095 }
1096 
1097 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1098 {
1099         struct sk_buff *skb = *pskb;
1100         struct slave *slave;
1101         struct bonding *bond;
1102         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1103                           struct slave *);
1104         int ret = RX_HANDLER_ANOTHER;
1105 
1106         skb = skb_share_check(skb, GFP_ATOMIC);
1107         if (unlikely(!skb))
1108                 return RX_HANDLER_CONSUMED;
1109 
1110         *pskb = skb;
1111 
1112         slave = bond_slave_get_rcu(skb->dev);
1113         bond = slave->bond;
1114 
1115         recv_probe = ACCESS_ONCE(bond->recv_probe);
1116         if (recv_probe) {
1117                 ret = recv_probe(skb, bond, slave);
1118                 if (ret == RX_HANDLER_CONSUMED) {
1119                         consume_skb(skb);
1120                         return ret;
1121                 }
1122         }
1123 
1124         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1125                 return RX_HANDLER_EXACT;
1126         }
1127 
1128         skb->dev = bond->dev;
1129 
1130         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1131             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1132             skb->pkt_type == PACKET_HOST) {
1133 
1134                 if (unlikely(skb_cow_head(skb,
1135                                           skb->data - skb_mac_header(skb)))) {
1136                         kfree_skb(skb);
1137                         return RX_HANDLER_CONSUMED;
1138                 }
1139                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1140         }
1141 
1142         return ret;
1143 }
1144 
1145 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1146                                       struct net_device *slave_dev,
1147                                       struct slave *slave)
1148 {
1149         int err;
1150 
1151         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1152         if (err)
1153                 return err;
1154         slave_dev->flags |= IFF_SLAVE;
1155         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1156         return 0;
1157 }
1158 
1159 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1160                                   struct net_device *slave_dev)
1161 {
1162         netdev_upper_dev_unlink(slave_dev, bond_dev);
1163         slave_dev->flags &= ~IFF_SLAVE;
1164         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1165 }
1166 
1167 static struct slave *bond_alloc_slave(struct bonding *bond)
1168 {
1169         struct slave *slave = NULL;
1170 
1171         slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1172         if (!slave)
1173                 return NULL;
1174 
1175         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1176                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1177                                                GFP_KERNEL);
1178                 if (!SLAVE_AD_INFO(slave)) {
1179                         kfree(slave);
1180                         return NULL;
1181                 }
1182         }
1183         return slave;
1184 }
1185 
1186 static void bond_free_slave(struct slave *slave)
1187 {
1188         struct bonding *bond = bond_get_bond_by_slave(slave);
1189 
1190         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1191                 kfree(SLAVE_AD_INFO(slave));
1192 
1193         kfree(slave);
1194 }
1195 
1196 /* enslave device <slave> to bond device <master> */
1197 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1198 {
1199         struct bonding *bond = netdev_priv(bond_dev);
1200         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1201         struct slave *new_slave = NULL, *prev_slave;
1202         struct sockaddr addr;
1203         int link_reporting;
1204         int res = 0, i;
1205 
1206         if (!bond->params.use_carrier &&
1207             slave_dev->ethtool_ops->get_link == NULL &&
1208             slave_ops->ndo_do_ioctl == NULL) {
1209                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1210                             slave_dev->name);
1211         }
1212 
1213         /* already enslaved */
1214         if (slave_dev->flags & IFF_SLAVE) {
1215                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1216                 return -EBUSY;
1217         }
1218 
1219         if (bond_dev == slave_dev) {
1220                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1221                 return -EPERM;
1222         }
1223 
1224         /* vlan challenged mutual exclusion */
1225         /* no need to lock since we're protected by rtnl_lock */
1226         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1227                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1228                            slave_dev->name);
1229                 if (vlan_uses_dev(bond_dev)) {
1230                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1231                                    slave_dev->name, bond_dev->name);
1232                         return -EPERM;
1233                 } else {
1234                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1235                                     slave_dev->name, slave_dev->name,
1236                                     bond_dev->name);
1237                 }
1238         } else {
1239                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1240                            slave_dev->name);
1241         }
1242 
1243         /*
1244          * Old ifenslave binaries are no longer supported.  These can
1245          * be identified with moderate accuracy by the state of the slave:
1246          * the current ifenslave will set the interface down prior to
1247          * enslaving it; the old ifenslave will not.
1248          */
1249         if ((slave_dev->flags & IFF_UP)) {
1250                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1251                            slave_dev->name);
1252                 res = -EPERM;
1253                 goto err_undo_flags;
1254         }
1255 
1256         /* set bonding device ether type by slave - bonding netdevices are
1257          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1258          * there is a need to override some of the type dependent attribs/funcs.
1259          *
1260          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1261          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1262          */
1263         if (!bond_has_slaves(bond)) {
1264                 if (bond_dev->type != slave_dev->type) {
1265                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1266                                    bond_dev->type, slave_dev->type);
1267 
1268                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1269                                                        bond_dev);
1270                         res = notifier_to_errno(res);
1271                         if (res) {
1272                                 netdev_err(bond_dev, "refused to change device type\n");
1273                                 res = -EBUSY;
1274                                 goto err_undo_flags;
1275                         }
1276 
1277                         /* Flush unicast and multicast addresses */
1278                         dev_uc_flush(bond_dev);
1279                         dev_mc_flush(bond_dev);
1280 
1281                         if (slave_dev->type != ARPHRD_ETHER)
1282                                 bond_setup_by_slave(bond_dev, slave_dev);
1283                         else {
1284                                 ether_setup(bond_dev);
1285                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1286                         }
1287 
1288                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1289                                                  bond_dev);
1290                 }
1291         } else if (bond_dev->type != slave_dev->type) {
1292                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1293                            slave_dev->name, slave_dev->type, bond_dev->type);
1294                 res = -EINVAL;
1295                 goto err_undo_flags;
1296         }
1297 
1298         if (slave_ops->ndo_set_mac_address == NULL) {
1299                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1300                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1301                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1302                         if (!bond_has_slaves(bond)) {
1303                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1304                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1305                         } else {
1306                                 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");
1307                                 res = -EOPNOTSUPP;
1308                                 goto err_undo_flags;
1309                         }
1310                 }
1311         }
1312 
1313         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1314 
1315         /* If this is the first slave, then we need to set the master's hardware
1316          * address to be the same as the slave's. */
1317         if (!bond_has_slaves(bond) &&
1318             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1319                 bond_set_dev_addr(bond->dev, slave_dev);
1320 
1321         new_slave = bond_alloc_slave(bond);
1322         if (!new_slave) {
1323                 res = -ENOMEM;
1324                 goto err_undo_flags;
1325         }
1326 
1327         new_slave->bond = bond;
1328         new_slave->dev = slave_dev;
1329         /*
1330          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1331          * is set via sysfs or module option if desired.
1332          */
1333         new_slave->queue_id = 0;
1334 
1335         /* Save slave's original mtu and then set it to match the bond */
1336         new_slave->original_mtu = slave_dev->mtu;
1337         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1338         if (res) {
1339                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1340                 goto err_free;
1341         }
1342 
1343         /*
1344          * Save slave's original ("permanent") mac address for modes
1345          * that need it, and for restoring it upon release, and then
1346          * set it to the master's address
1347          */
1348         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1349 
1350         if (!bond->params.fail_over_mac ||
1351             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1352                 /*
1353                  * Set slave to master's mac address.  The application already
1354                  * set the master's mac address to that of the first slave
1355                  */
1356                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1357                 addr.sa_family = slave_dev->type;
1358                 res = dev_set_mac_address(slave_dev, &addr);
1359                 if (res) {
1360                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1361                         goto err_restore_mtu;
1362                 }
1363         }
1364 
1365         /* open the slave since the application closed it */
1366         res = dev_open(slave_dev);
1367         if (res) {
1368                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1369                 goto err_restore_mac;
1370         }
1371 
1372         slave_dev->priv_flags |= IFF_BONDING;
1373 
1374         if (bond_is_lb(bond)) {
1375                 /* bond_alb_init_slave() must be called before all other stages since
1376                  * it might fail and we do not want to have to undo everything
1377                  */
1378                 res = bond_alb_init_slave(bond, new_slave);
1379                 if (res)
1380                         goto err_close;
1381         }
1382 
1383         /* If the mode uses primary, then the following is handled by
1384          * bond_change_active_slave().
1385          */
1386         if (!bond_uses_primary(bond)) {
1387                 /* set promiscuity level to new slave */
1388                 if (bond_dev->flags & IFF_PROMISC) {
1389                         res = dev_set_promiscuity(slave_dev, 1);
1390                         if (res)
1391                                 goto err_close;
1392                 }
1393 
1394                 /* set allmulti level to new slave */
1395                 if (bond_dev->flags & IFF_ALLMULTI) {
1396                         res = dev_set_allmulti(slave_dev, 1);
1397                         if (res)
1398                                 goto err_close;
1399                 }
1400 
1401                 netif_addr_lock_bh(bond_dev);
1402 
1403                 dev_mc_sync_multiple(slave_dev, bond_dev);
1404                 dev_uc_sync_multiple(slave_dev, bond_dev);
1405 
1406                 netif_addr_unlock_bh(bond_dev);
1407         }
1408 
1409         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1410                 /* add lacpdu mc addr to mc list */
1411                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1412 
1413                 dev_mc_add(slave_dev, lacpdu_multicast);
1414         }
1415 
1416         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1417         if (res) {
1418                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1419                            slave_dev->name);
1420                 goto err_close;
1421         }
1422 
1423         prev_slave = bond_last_slave(bond);
1424 
1425         new_slave->delay = 0;
1426         new_slave->link_failure_count = 0;
1427 
1428         bond_update_speed_duplex(new_slave);
1429 
1430         new_slave->last_rx = jiffies -
1431                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1432         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1433                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1434 
1435         if (bond->params.miimon && !bond->params.use_carrier) {
1436                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1437 
1438                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1439                         /*
1440                          * miimon is set but a bonded network driver
1441                          * does not support ETHTOOL/MII and
1442                          * arp_interval is not set.  Note: if
1443                          * use_carrier is enabled, we will never go
1444                          * here (because netif_carrier is always
1445                          * supported); thus, we don't need to change
1446                          * the messages for netif_carrier.
1447                          */
1448                         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",
1449                                     slave_dev->name);
1450                 } else if (link_reporting == -1) {
1451                         /* unable get link status using mii/ethtool */
1452                         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",
1453                                     slave_dev->name);
1454                 }
1455         }
1456 
1457         /* check for initial state */
1458         if (bond->params.miimon) {
1459                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1460                         if (bond->params.updelay) {
1461                                 new_slave->link = BOND_LINK_BACK;
1462                                 new_slave->delay = bond->params.updelay;
1463                         } else {
1464                                 new_slave->link = BOND_LINK_UP;
1465                         }
1466                 } else {
1467                         new_slave->link = BOND_LINK_DOWN;
1468                 }
1469         } else if (bond->params.arp_interval) {
1470                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1471                         BOND_LINK_UP : BOND_LINK_DOWN);
1472         } else {
1473                 new_slave->link = BOND_LINK_UP;
1474         }
1475 
1476         if (new_slave->link != BOND_LINK_DOWN)
1477                 new_slave->last_link_up = jiffies;
1478         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1479                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1480                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1481 
1482         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1483                 /* if there is a primary slave, remember it */
1484                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1485                         bond->primary_slave = new_slave;
1486                         bond->force_primary = true;
1487                 }
1488         }
1489 
1490         switch (BOND_MODE(bond)) {
1491         case BOND_MODE_ACTIVEBACKUP:
1492                 bond_set_slave_inactive_flags(new_slave,
1493                                               BOND_SLAVE_NOTIFY_NOW);
1494                 break;
1495         case BOND_MODE_8023AD:
1496                 /* in 802.3ad mode, the internal mechanism
1497                  * will activate the slaves in the selected
1498                  * aggregator
1499                  */
1500                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1501                 /* if this is the first slave */
1502                 if (!prev_slave) {
1503                         SLAVE_AD_INFO(new_slave)->id = 1;
1504                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1505                          * can be called only after the mac address of the bond is set
1506                          */
1507                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1508                 } else {
1509                         SLAVE_AD_INFO(new_slave)->id =
1510                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1511                 }
1512 
1513                 bond_3ad_bind_slave(new_slave);
1514                 break;
1515         case BOND_MODE_TLB:
1516         case BOND_MODE_ALB:
1517                 bond_set_active_slave(new_slave);
1518                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1519                 break;
1520         default:
1521                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1522 
1523                 /* always active in trunk mode */
1524                 bond_set_active_slave(new_slave);
1525 
1526                 /* In trunking mode there is little meaning to curr_active_slave
1527                  * anyway (it holds no special properties of the bond device),
1528                  * so we can change it without calling change_active_interface()
1529                  */
1530                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1531                     new_slave->link == BOND_LINK_UP)
1532                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1533 
1534                 break;
1535         } /* switch(bond_mode) */
1536 
1537 #ifdef CONFIG_NET_POLL_CONTROLLER
1538         slave_dev->npinfo = bond->dev->npinfo;
1539         if (slave_dev->npinfo) {
1540                 if (slave_enable_netpoll(new_slave)) {
1541                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1542                         res = -EBUSY;
1543                         goto err_detach;
1544                 }
1545         }
1546 #endif
1547 
1548         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1549                                          new_slave);
1550         if (res) {
1551                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1552                 goto err_detach;
1553         }
1554 
1555         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1556         if (res) {
1557                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1558                 goto err_unregister;
1559         }
1560 
1561         res = bond_sysfs_slave_add(new_slave);
1562         if (res) {
1563                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1564                 goto err_upper_unlink;
1565         }
1566 
1567         bond->slave_cnt++;
1568         bond_compute_features(bond);
1569         bond_set_carrier(bond);
1570 
1571         if (bond_uses_primary(bond)) {
1572                 block_netpoll_tx();
1573                 write_lock_bh(&bond->curr_slave_lock);
1574                 bond_select_active_slave(bond);
1575                 write_unlock_bh(&bond->curr_slave_lock);
1576                 unblock_netpoll_tx();
1577         }
1578 
1579         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1580                     slave_dev->name,
1581                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1582                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1583 
1584         /* enslave is successful */
1585         return 0;
1586 
1587 /* Undo stages on error */
1588 err_upper_unlink:
1589         bond_upper_dev_unlink(bond_dev, slave_dev);
1590 
1591 err_unregister:
1592         netdev_rx_handler_unregister(slave_dev);
1593 
1594 err_detach:
1595         if (!bond_uses_primary(bond))
1596                 bond_hw_addr_flush(bond_dev, slave_dev);
1597 
1598         vlan_vids_del_by_dev(slave_dev, bond_dev);
1599         if (bond->primary_slave == new_slave)
1600                 bond->primary_slave = NULL;
1601         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1602                 block_netpoll_tx();
1603                 write_lock_bh(&bond->curr_slave_lock);
1604                 bond_change_active_slave(bond, NULL);
1605                 bond_select_active_slave(bond);
1606                 write_unlock_bh(&bond->curr_slave_lock);
1607                 unblock_netpoll_tx();
1608         }
1609         slave_disable_netpoll(new_slave);
1610 
1611 err_close:
1612         slave_dev->priv_flags &= ~IFF_BONDING;
1613         dev_close(slave_dev);
1614 
1615 err_restore_mac:
1616         if (!bond->params.fail_over_mac ||
1617             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1618                 /* XXX TODO - fom follow mode needs to change master's
1619                  * MAC if this slave's MAC is in use by the bond, or at
1620                  * least print a warning.
1621                  */
1622                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1623                 addr.sa_family = slave_dev->type;
1624                 dev_set_mac_address(slave_dev, &addr);
1625         }
1626 
1627 err_restore_mtu:
1628         dev_set_mtu(slave_dev, new_slave->original_mtu);
1629 
1630 err_free:
1631         bond_free_slave(new_slave);
1632 
1633 err_undo_flags:
1634         /* Enslave of first slave has failed and we need to fix master's mac */
1635         if (!bond_has_slaves(bond) &&
1636             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1637                 eth_hw_addr_random(bond_dev);
1638 
1639         return res;
1640 }
1641 
1642 /*
1643  * Try to release the slave device <slave> from the bond device <master>
1644  * It is legal to access curr_active_slave without a lock because all the function
1645  * is write-locked. If "all" is true it means that the function is being called
1646  * while destroying a bond interface and all slaves are being released.
1647  *
1648  * The rules for slave state should be:
1649  *   for Active/Backup:
1650  *     Active stays on all backups go down
1651  *   for Bonded connections:
1652  *     The first up interface should be left on and all others downed.
1653  */
1654 static int __bond_release_one(struct net_device *bond_dev,
1655                               struct net_device *slave_dev,
1656                               bool all)
1657 {
1658         struct bonding *bond = netdev_priv(bond_dev);
1659         struct slave *slave, *oldcurrent;
1660         struct sockaddr addr;
1661         int old_flags = bond_dev->flags;
1662         netdev_features_t old_features = bond_dev->features;
1663 
1664         /* slave is not a slave or master is not master of this slave */
1665         if (!(slave_dev->flags & IFF_SLAVE) ||
1666             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1667                 netdev_err(bond_dev, "cannot release %s\n",
1668                            slave_dev->name);
1669                 return -EINVAL;
1670         }
1671 
1672         block_netpoll_tx();
1673 
1674         slave = bond_get_slave_by_dev(bond, slave_dev);
1675         if (!slave) {
1676                 /* not a slave of this bond */
1677                 netdev_info(bond_dev, "%s not enslaved\n",
1678                             slave_dev->name);
1679                 unblock_netpoll_tx();
1680                 return -EINVAL;
1681         }
1682 
1683         bond_sysfs_slave_del(slave);
1684 
1685         bond_upper_dev_unlink(bond_dev, slave_dev);
1686         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1687          * for this slave anymore.
1688          */
1689         netdev_rx_handler_unregister(slave_dev);
1690         write_lock_bh(&bond->lock);
1691 
1692         /* Inform AD package of unbinding of slave. */
1693         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1694                 bond_3ad_unbind_slave(slave);
1695 
1696         write_unlock_bh(&bond->lock);
1697 
1698         netdev_info(bond_dev, "Releasing %s interface %s\n",
1699                     bond_is_active_slave(slave) ? "active" : "backup",
1700                     slave_dev->name);
1701 
1702         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1703 
1704         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1705 
1706         if (!all && (!bond->params.fail_over_mac ||
1707                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1708                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1709                     bond_has_slaves(bond))
1710                         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",
1711                                     slave_dev->name, slave->perm_hwaddr,
1712                                     bond_dev->name, slave_dev->name);
1713         }
1714 
1715         if (bond->primary_slave == slave)
1716                 bond->primary_slave = NULL;
1717 
1718         if (oldcurrent == slave) {
1719                 write_lock_bh(&bond->curr_slave_lock);
1720                 bond_change_active_slave(bond, NULL);
1721                 write_unlock_bh(&bond->curr_slave_lock);
1722         }
1723 
1724         if (bond_is_lb(bond)) {
1725                 /* Must be called only after the slave has been
1726                  * detached from the list and the curr_active_slave
1727                  * has been cleared (if our_slave == old_current),
1728                  * but before a new active slave is selected.
1729                  */
1730                 bond_alb_deinit_slave(bond, slave);
1731         }
1732 
1733         if (all) {
1734                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1735         } else if (oldcurrent == slave) {
1736                 /*
1737                  * Note that we hold RTNL over this sequence, so there
1738                  * is no concern that another slave add/remove event
1739                  * will interfere.
1740                  */
1741                 write_lock_bh(&bond->curr_slave_lock);
1742 
1743                 bond_select_active_slave(bond);
1744 
1745                 write_unlock_bh(&bond->curr_slave_lock);
1746         }
1747 
1748         if (!bond_has_slaves(bond)) {
1749                 bond_set_carrier(bond);
1750                 eth_hw_addr_random(bond_dev);
1751         }
1752 
1753         unblock_netpoll_tx();
1754         synchronize_rcu();
1755         bond->slave_cnt--;
1756 
1757         if (!bond_has_slaves(bond)) {
1758                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1759                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1760         }
1761 
1762         bond_compute_features(bond);
1763         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1764             (old_features & NETIF_F_VLAN_CHALLENGED))
1765                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1766                             slave_dev->name, bond_dev->name);
1767 
1768         /* must do this from outside any spinlocks */
1769         vlan_vids_del_by_dev(slave_dev, bond_dev);
1770 
1771         /* If the mode uses primary, then this cases was handled above by
1772          * bond_change_active_slave(..., NULL)
1773          */
1774         if (!bond_uses_primary(bond)) {
1775                 /* unset promiscuity level from slave
1776                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1777                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1778                  * value of that flag before that change, as that was the value
1779                  * when this slave was attached, so we cache at the start of the
1780                  * function and use it here. Same goes for ALLMULTI below
1781                  */
1782                 if (old_flags & IFF_PROMISC)
1783                         dev_set_promiscuity(slave_dev, -1);
1784 
1785                 /* unset allmulti level from slave */
1786                 if (old_flags & IFF_ALLMULTI)
1787                         dev_set_allmulti(slave_dev, -1);
1788 
1789                 bond_hw_addr_flush(bond_dev, slave_dev);
1790         }
1791 
1792         slave_disable_netpoll(slave);
1793 
1794         /* close slave before restoring its mac address */
1795         dev_close(slave_dev);
1796 
1797         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1798             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1799                 /* restore original ("permanent") mac address */
1800                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1801                 addr.sa_family = slave_dev->type;
1802                 dev_set_mac_address(slave_dev, &addr);
1803         }
1804 
1805         dev_set_mtu(slave_dev, slave->original_mtu);
1806 
1807         slave_dev->priv_flags &= ~IFF_BONDING;
1808 
1809         bond_free_slave(slave);
1810 
1811         return 0;  /* deletion OK */
1812 }
1813 
1814 /* A wrapper used because of ndo_del_link */
1815 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1816 {
1817         return __bond_release_one(bond_dev, slave_dev, false);
1818 }
1819 
1820 /*
1821 * First release a slave and then destroy the bond if no more slaves are left.
1822 * Must be under rtnl_lock when this function is called.
1823 */
1824 static int  bond_release_and_destroy(struct net_device *bond_dev,
1825                                      struct net_device *slave_dev)
1826 {
1827         struct bonding *bond = netdev_priv(bond_dev);
1828         int ret;
1829 
1830         ret = bond_release(bond_dev, slave_dev);
1831         if (ret == 0 && !bond_has_slaves(bond)) {
1832                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1833                 netdev_info(bond_dev, "Destroying bond %s\n",
1834                             bond_dev->name);
1835                 unregister_netdevice(bond_dev);
1836         }
1837         return ret;
1838 }
1839 
1840 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1841 {
1842         struct bonding *bond = netdev_priv(bond_dev);
1843 
1844         info->bond_mode = BOND_MODE(bond);
1845         info->miimon = bond->params.miimon;
1846 
1847         info->num_slaves = bond->slave_cnt;
1848 
1849         return 0;
1850 }
1851 
1852 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1853 {
1854         struct bonding *bond = netdev_priv(bond_dev);
1855         struct list_head *iter;
1856         int i = 0, res = -ENODEV;
1857         struct slave *slave;
1858 
1859         bond_for_each_slave(bond, slave, iter) {
1860                 if (i++ == (int)info->slave_id) {
1861                         res = 0;
1862                         strcpy(info->slave_name, slave->dev->name);
1863                         info->link = slave->link;
1864                         info->state = bond_slave_state(slave);
1865                         info->link_failure_count = slave->link_failure_count;
1866                         break;
1867                 }
1868         }
1869 
1870         return res;
1871 }
1872 
1873 /*-------------------------------- Monitoring -------------------------------*/
1874 
1875 /* called with rcu_read_lock() */
1876 static int bond_miimon_inspect(struct bonding *bond)
1877 {
1878         int link_state, commit = 0;
1879         struct list_head *iter;
1880         struct slave *slave;
1881         bool ignore_updelay;
1882 
1883         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1884 
1885         bond_for_each_slave_rcu(bond, slave, iter) {
1886                 slave->new_link = BOND_LINK_NOCHANGE;
1887 
1888                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1889 
1890                 switch (slave->link) {
1891                 case BOND_LINK_UP:
1892                         if (link_state)
1893                                 continue;
1894 
1895                         slave->link = BOND_LINK_FAIL;
1896                         slave->delay = bond->params.downdelay;
1897                         if (slave->delay) {
1898                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1899                                             (BOND_MODE(bond) ==
1900                                              BOND_MODE_ACTIVEBACKUP) ?
1901                                              (bond_is_active_slave(slave) ?
1902                                               "active " : "backup ") : "",
1903                                             slave->dev->name,
1904                                             bond->params.downdelay * bond->params.miimon);
1905                         }
1906                         /*FALLTHRU*/
1907                 case BOND_LINK_FAIL:
1908                         if (link_state) {
1909                                 /*
1910                                  * recovered before downdelay expired
1911                                  */
1912                                 slave->link = BOND_LINK_UP;
1913                                 slave->last_link_up = jiffies;
1914                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1915                                             (bond->params.downdelay - slave->delay) *
1916                                             bond->params.miimon,
1917                                             slave->dev->name);
1918                                 continue;
1919                         }
1920 
1921                         if (slave->delay <= 0) {
1922                                 slave->new_link = BOND_LINK_DOWN;
1923                                 commit++;
1924                                 continue;
1925                         }
1926 
1927                         slave->delay--;
1928                         break;
1929 
1930                 case BOND_LINK_DOWN:
1931                         if (!link_state)
1932                                 continue;
1933 
1934                         slave->link = BOND_LINK_BACK;
1935                         slave->delay = bond->params.updelay;
1936 
1937                         if (slave->delay) {
1938                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1939                                             slave->dev->name,
1940                                             ignore_updelay ? 0 :
1941                                             bond->params.updelay *
1942                                             bond->params.miimon);
1943                         }
1944                         /*FALLTHRU*/
1945                 case BOND_LINK_BACK:
1946                         if (!link_state) {
1947                                 slave->link = BOND_LINK_DOWN;
1948                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
1949                                             (bond->params.updelay - slave->delay) *
1950                                             bond->params.miimon,
1951                                             slave->dev->name);
1952 
1953                                 continue;
1954                         }
1955 
1956                         if (ignore_updelay)
1957                                 slave->delay = 0;
1958 
1959                         if (slave->delay <= 0) {
1960                                 slave->new_link = BOND_LINK_UP;
1961                                 commit++;
1962                                 ignore_updelay = false;
1963                                 continue;
1964                         }
1965 
1966                         slave->delay--;
1967                         break;
1968                 }
1969         }
1970 
1971         return commit;
1972 }
1973 
1974 static void bond_miimon_commit(struct bonding *bond)
1975 {
1976         struct list_head *iter;
1977         struct slave *slave;
1978 
1979         bond_for_each_slave(bond, slave, iter) {
1980                 switch (slave->new_link) {
1981                 case BOND_LINK_NOCHANGE:
1982                         continue;
1983 
1984                 case BOND_LINK_UP:
1985                         slave->link = BOND_LINK_UP;
1986                         slave->last_link_up = jiffies;
1987 
1988                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1989                                 /* prevent it from being the active one */
1990                                 bond_set_backup_slave(slave);
1991                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1992                                 /* make it immediately active */
1993                                 bond_set_active_slave(slave);
1994                         } else if (slave != bond->primary_slave) {
1995                                 /* prevent it from being the active one */
1996                                 bond_set_backup_slave(slave);
1997                         }
1998 
1999                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2000                                     slave->dev->name,
2001                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2002                                     slave->duplex ? "full" : "half");
2003 
2004                         /* notify ad that the link status has changed */
2005                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2006                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2007 
2008                         if (bond_is_lb(bond))
2009                                 bond_alb_handle_link_change(bond, slave,
2010                                                             BOND_LINK_UP);
2011 
2012                         if (!bond->curr_active_slave ||
2013                             (slave == bond->primary_slave))
2014                                 goto do_failover;
2015 
2016                         continue;
2017 
2018                 case BOND_LINK_DOWN:
2019                         if (slave->link_failure_count < UINT_MAX)
2020                                 slave->link_failure_count++;
2021 
2022                         slave->link = BOND_LINK_DOWN;
2023 
2024                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2025                             BOND_MODE(bond) == BOND_MODE_8023AD)
2026                                 bond_set_slave_inactive_flags(slave,
2027                                                               BOND_SLAVE_NOTIFY_NOW);
2028 
2029                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2030                                     slave->dev->name);
2031 
2032                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2033                                 bond_3ad_handle_link_change(slave,
2034                                                             BOND_LINK_DOWN);
2035 
2036                         if (bond_is_lb(bond))
2037                                 bond_alb_handle_link_change(bond, slave,
2038                                                             BOND_LINK_DOWN);
2039 
2040                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2041                                 goto do_failover;
2042 
2043                         continue;
2044 
2045                 default:
2046                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2047                                    slave->new_link, slave->dev->name);
2048                         slave->new_link = BOND_LINK_NOCHANGE;
2049 
2050                         continue;
2051                 }
2052 
2053 do_failover:
2054                 ASSERT_RTNL();
2055                 block_netpoll_tx();
2056                 write_lock_bh(&bond->curr_slave_lock);
2057                 bond_select_active_slave(bond);
2058                 write_unlock_bh(&bond->curr_slave_lock);
2059                 unblock_netpoll_tx();
2060         }
2061 
2062         bond_set_carrier(bond);
2063 }
2064 
2065 /*
2066  * bond_mii_monitor
2067  *
2068  * Really a wrapper that splits the mii monitor into two phases: an
2069  * inspection, then (if inspection indicates something needs to be done)
2070  * an acquisition of appropriate locks followed by a commit phase to
2071  * implement whatever link state changes are indicated.
2072  */
2073 static void bond_mii_monitor(struct work_struct *work)
2074 {
2075         struct bonding *bond = container_of(work, struct bonding,
2076                                             mii_work.work);
2077         bool should_notify_peers = false;
2078         unsigned long delay;
2079 
2080         delay = msecs_to_jiffies(bond->params.miimon);
2081 
2082         if (!bond_has_slaves(bond))
2083                 goto re_arm;
2084 
2085         rcu_read_lock();
2086 
2087         should_notify_peers = bond_should_notify_peers(bond);
2088 
2089         if (bond_miimon_inspect(bond)) {
2090                 rcu_read_unlock();
2091 
2092                 /* Race avoidance with bond_close cancel of workqueue */
2093                 if (!rtnl_trylock()) {
2094                         delay = 1;
2095                         should_notify_peers = false;
2096                         goto re_arm;
2097                 }
2098 
2099                 bond_miimon_commit(bond);
2100 
2101                 rtnl_unlock();  /* might sleep, hold no other locks */
2102         } else
2103                 rcu_read_unlock();
2104 
2105 re_arm:
2106         if (bond->params.miimon)
2107                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2108 
2109         if (should_notify_peers) {
2110                 if (!rtnl_trylock())
2111                         return;
2112                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2113                 rtnl_unlock();
2114         }
2115 }
2116 
2117 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2118 {
2119         struct net_device *upper;
2120         struct list_head *iter;
2121         bool ret = false;
2122 
2123         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2124                 return true;
2125 
2126         rcu_read_lock();
2127         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2128                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2129                         ret = true;
2130                         break;
2131                 }
2132         }
2133         rcu_read_unlock();
2134 
2135         return ret;
2136 }
2137 
2138 /*
2139  * We go to the (large) trouble of VLAN tagging ARP frames because
2140  * switches in VLAN mode (especially if ports are configured as
2141  * "native" to a VLAN) might not pass non-tagged frames.
2142  */
2143 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2144                           __be32 dest_ip, __be32 src_ip,
2145                           struct bond_vlan_tag *tags)
2146 {
2147         struct sk_buff *skb;
2148         struct bond_vlan_tag *outer_tag = tags;
2149 
2150         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2151                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2152 
2153         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2154                          NULL, slave_dev->dev_addr, NULL);
2155 
2156         if (!skb) {
2157                 net_err_ratelimited("ARP packet allocation failed\n");
2158                 return;
2159         }
2160 
2161         if (!tags || tags->vlan_proto == VLAN_N_VID)
2162                 goto xmit;
2163 
2164         tags++;
2165 
2166         /* Go through all the tags backwards and add them to the packet */
2167         while (tags->vlan_proto != VLAN_N_VID) {
2168                 if (!tags->vlan_id) {
2169                         tags++;
2170                         continue;
2171                 }
2172 
2173                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2174                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2175                 skb = __vlan_put_tag(skb, tags->vlan_proto,
2176                                      tags->vlan_id);
2177                 if (!skb) {
2178                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2179                         return;
2180                 }
2181 
2182                 tags++;
2183         }
2184         /* Set the outer tag */
2185         if (outer_tag->vlan_id) {
2186                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2187                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2188                 skb = vlan_put_tag(skb, outer_tag->vlan_proto,
2189                                    outer_tag->vlan_id);
2190                 if (!skb) {
2191                         net_err_ratelimited("failed to insert outer VLAN tag\n");
2192                         return;
2193                 }
2194         }
2195 
2196 xmit:
2197         arp_xmit(skb);
2198 }
2199 
2200 /* Validate the device path between the @start_dev and the @end_dev.
2201  * The path is valid if the @end_dev is reachable through device
2202  * stacking.
2203  * When the path is validated, collect any vlan information in the
2204  * path.
2205  */
2206 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2207                                               struct net_device *end_dev,
2208                                               int level)
2209 {
2210         struct bond_vlan_tag *tags;
2211         struct net_device *upper;
2212         struct list_head  *iter;
2213 
2214         if (start_dev == end_dev) {
2215                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2216                 if (!tags)
2217                         return ERR_PTR(-ENOMEM);
2218                 tags[level].vlan_proto = VLAN_N_VID;
2219                 return tags;
2220         }
2221 
2222         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2223                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2224                 if (IS_ERR_OR_NULL(tags)) {
2225                         if (IS_ERR(tags))
2226                                 return tags;
2227                         continue;
2228                 }
2229                 if (is_vlan_dev(upper)) {
2230                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2231                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2232                 }
2233 
2234                 return tags;
2235         }
2236 
2237         return NULL;
2238 }
2239 
2240 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2241 {
2242         struct rtable *rt;
2243         struct bond_vlan_tag *tags;
2244         __be32 *targets = bond->params.arp_targets, addr;
2245         int i;
2246 
2247         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2248                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2249                 tags = NULL;
2250 
2251                 /* Find out through which dev should the packet go */
2252                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2253                                      RTO_ONLINK, 0);
2254                 if (IS_ERR(rt)) {
2255                         /* there's no route to target - try to send arp
2256                          * probe to generate any traffic (arp_validate=0)
2257                          */
2258                         if (bond->params.arp_validate)
2259                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2260                                                      bond->dev->name,
2261                                                      &targets[i]);
2262                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2263                                       0, tags);
2264                         continue;
2265                 }
2266 
2267                 /* bond device itself */
2268                 if (rt->dst.dev == bond->dev)
2269                         goto found;
2270 
2271                 rcu_read_lock();
2272                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2273                 rcu_read_unlock();
2274 
2275                 if (!IS_ERR_OR_NULL(tags))
2276                         goto found;
2277 
2278                 /* Not our device - skip */
2279                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2280                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2281 
2282                 ip_rt_put(rt);
2283                 continue;
2284 
2285 found:
2286                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2287                 ip_rt_put(rt);
2288                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2289                               addr, tags);
2290                 kfree(tags);
2291         }
2292 }
2293 
2294 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2295 {
2296         int i;
2297 
2298         if (!sip || !bond_has_this_ip(bond, tip)) {
2299                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2300                            &sip, &tip);
2301                 return;
2302         }
2303 
2304         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2305         if (i == -1) {
2306                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2307                            &sip);
2308                 return;
2309         }
2310         slave->last_rx = jiffies;
2311         slave->target_last_arp_rx[i] = jiffies;
2312 }
2313 
2314 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2315                  struct slave *slave)
2316 {
2317         struct arphdr *arp = (struct arphdr *)skb->data;
2318         struct slave *curr_active_slave;
2319         unsigned char *arp_ptr;
2320         __be32 sip, tip;
2321         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2322 
2323         if (!slave_do_arp_validate(bond, slave)) {
2324                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2325                     !slave_do_arp_validate_only(bond))
2326                         slave->last_rx = jiffies;
2327                 return RX_HANDLER_ANOTHER;
2328         } else if (!is_arp) {
2329                 return RX_HANDLER_ANOTHER;
2330         }
2331 
2332         alen = arp_hdr_len(bond->dev);
2333 
2334         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2335                    skb->dev->name);
2336 
2337         if (alen > skb_headlen(skb)) {
2338                 arp = kmalloc(alen, GFP_ATOMIC);
2339                 if (!arp)
2340                         goto out_unlock;
2341                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2342                         goto out_unlock;
2343         }
2344 
2345         if (arp->ar_hln != bond->dev->addr_len ||
2346             skb->pkt_type == PACKET_OTHERHOST ||
2347             skb->pkt_type == PACKET_LOOPBACK ||
2348             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2349             arp->ar_pro != htons(ETH_P_IP) ||
2350             arp->ar_pln != 4)
2351                 goto out_unlock;
2352 
2353         arp_ptr = (unsigned char *)(arp + 1);
2354         arp_ptr += bond->dev->addr_len;
2355         memcpy(&sip, arp_ptr, 4);
2356         arp_ptr += 4 + bond->dev->addr_len;
2357         memcpy(&tip, arp_ptr, 4);
2358 
2359         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2360                    slave->dev->name, bond_slave_state(slave),
2361                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2362                      &sip, &tip);
2363 
2364         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2365 
2366         /*
2367          * Backup slaves won't see the ARP reply, but do come through
2368          * here for each ARP probe (so we swap the sip/tip to validate
2369          * the probe).  In a "redundant switch, common router" type of
2370          * configuration, the ARP probe will (hopefully) travel from
2371          * the active, through one switch, the router, then the other
2372          * switch before reaching the backup.
2373          *
2374          * We 'trust' the arp requests if there is an active slave and
2375          * it received valid arp reply(s) after it became active. This
2376          * is done to avoid endless looping when we can't reach the
2377          * arp_ip_target and fool ourselves with our own arp requests.
2378          */
2379 
2380         if (bond_is_active_slave(slave))
2381                 bond_validate_arp(bond, slave, sip, tip);
2382         else if (curr_active_slave &&
2383                  time_after(slave_last_rx(bond, curr_active_slave),
2384                             curr_active_slave->last_link_up))
2385                 bond_validate_arp(bond, slave, tip, sip);
2386 
2387 out_unlock:
2388         if (arp != (struct arphdr *)skb->data)
2389                 kfree(arp);
2390         return RX_HANDLER_ANOTHER;
2391 }
2392 
2393 /* function to verify if we're in the arp_interval timeslice, returns true if
2394  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2395  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2396  */
2397 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2398                                   int mod)
2399 {
2400         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2401 
2402         return time_in_range(jiffies,
2403                              last_act - delta_in_ticks,
2404                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2405 }
2406 
2407 /*
2408  * this function is called regularly to monitor each slave's link
2409  * ensuring that traffic is being sent and received when arp monitoring
2410  * is used in load-balancing mode. if the adapter has been dormant, then an
2411  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2412  * arp monitoring in active backup mode.
2413  */
2414 static void bond_loadbalance_arp_mon(struct work_struct *work)
2415 {
2416         struct bonding *bond = container_of(work, struct bonding,
2417                                             arp_work.work);
2418         struct slave *slave, *oldcurrent;
2419         struct list_head *iter;
2420         int do_failover = 0, slave_state_changed = 0;
2421 
2422         if (!bond_has_slaves(bond))
2423                 goto re_arm;
2424 
2425         rcu_read_lock();
2426 
2427         oldcurrent = rcu_dereference(bond->curr_active_slave);
2428         /* see if any of the previous devices are up now (i.e. they have
2429          * xmt and rcv traffic). the curr_active_slave does not come into
2430          * the picture unless it is null. also, slave->last_link_up is not
2431          * needed here because we send an arp on each slave and give a slave
2432          * as long as it needs to get the tx/rx within the delta.
2433          * TODO: what about up/down delay in arp mode? it wasn't here before
2434          *       so it can wait
2435          */
2436         bond_for_each_slave_rcu(bond, slave, iter) {
2437                 unsigned long trans_start = dev_trans_start(slave->dev);
2438 
2439                 if (slave->link != BOND_LINK_UP) {
2440                         if (bond_time_in_interval(bond, trans_start, 1) &&
2441                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2442 
2443                                 slave->link  = BOND_LINK_UP;
2444                                 slave_state_changed = 1;
2445 
2446                                 /* primary_slave has no meaning in round-robin
2447                                  * mode. the window of a slave being up and
2448                                  * curr_active_slave being null after enslaving
2449                                  * is closed.
2450                                  */
2451                                 if (!oldcurrent) {
2452                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2453                                                     slave->dev->name);
2454                                         do_failover = 1;
2455                                 } else {
2456                                         netdev_info(bond->dev, "interface %s is now up\n",
2457                                                     slave->dev->name);
2458                                 }
2459                         }
2460                 } else {
2461                         /* slave->link == BOND_LINK_UP */
2462 
2463                         /* not all switches will respond to an arp request
2464                          * when the source ip is 0, so don't take the link down
2465                          * if we don't know our ip yet
2466                          */
2467                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2468                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2469 
2470                                 slave->link  = BOND_LINK_DOWN;
2471                                 slave_state_changed = 1;
2472 
2473                                 if (slave->link_failure_count < UINT_MAX)
2474                                         slave->link_failure_count++;
2475 
2476                                 netdev_info(bond->dev, "interface %s is now down\n",
2477                                             slave->dev->name);
2478 
2479                                 if (slave == oldcurrent)
2480                                         do_failover = 1;
2481                         }
2482                 }
2483 
2484                 /* note: if switch is in round-robin mode, all links
2485                  * must tx arp to ensure all links rx an arp - otherwise
2486                  * links may oscillate or not come up at all; if switch is
2487                  * in something like xor mode, there is nothing we can
2488                  * do - all replies will be rx'ed on same link causing slaves
2489                  * to be unstable during low/no traffic periods
2490                  */
2491                 if (bond_slave_is_up(slave))
2492                         bond_arp_send_all(bond, slave);
2493         }
2494 
2495         rcu_read_unlock();
2496 
2497         if (do_failover || slave_state_changed) {
2498                 if (!rtnl_trylock())
2499                         goto re_arm;
2500 
2501                 if (slave_state_changed) {
2502                         bond_slave_state_change(bond);
2503                 } else if (do_failover) {
2504                         /* the bond_select_active_slave must hold RTNL
2505                          * and curr_slave_lock for write.
2506                          */
2507                         block_netpoll_tx();
2508                         write_lock_bh(&bond->curr_slave_lock);
2509 
2510                         bond_select_active_slave(bond);
2511 
2512                         write_unlock_bh(&bond->curr_slave_lock);
2513                         unblock_netpoll_tx();
2514                 }
2515                 rtnl_unlock();
2516         }
2517 
2518 re_arm:
2519         if (bond->params.arp_interval)
2520                 queue_delayed_work(bond->wq, &bond->arp_work,
2521                                    msecs_to_jiffies(bond->params.arp_interval));
2522 }
2523 
2524 /*
2525  * Called to inspect slaves for active-backup mode ARP monitor link state
2526  * changes.  Sets new_link in slaves to specify what action should take
2527  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2528  * to link states must be committed.
2529  *
2530  * Called with rcu_read_lock hold.
2531  */
2532 static int bond_ab_arp_inspect(struct bonding *bond)
2533 {
2534         unsigned long trans_start, last_rx;
2535         struct list_head *iter;
2536         struct slave *slave;
2537         int commit = 0;
2538 
2539         bond_for_each_slave_rcu(bond, slave, iter) {
2540                 slave->new_link = BOND_LINK_NOCHANGE;
2541                 last_rx = slave_last_rx(bond, slave);
2542 
2543                 if (slave->link != BOND_LINK_UP) {
2544                         if (bond_time_in_interval(bond, last_rx, 1)) {
2545                                 slave->new_link = BOND_LINK_UP;
2546                                 commit++;
2547                         }
2548                         continue;
2549                 }
2550 
2551                 /*
2552                  * Give slaves 2*delta after being enslaved or made
2553                  * active.  This avoids bouncing, as the last receive
2554                  * times need a full ARP monitor cycle to be updated.
2555                  */
2556                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2557                         continue;
2558 
2559                 /*
2560                  * Backup slave is down if:
2561                  * - No current_arp_slave AND
2562                  * - more than 3*delta since last receive AND
2563                  * - the bond has an IP address
2564                  *
2565                  * Note: a non-null current_arp_slave indicates
2566                  * the curr_active_slave went down and we are
2567                  * searching for a new one; under this condition
2568                  * we only take the curr_active_slave down - this
2569                  * gives each slave a chance to tx/rx traffic
2570                  * before being taken out
2571                  */
2572                 if (!bond_is_active_slave(slave) &&
2573                     !rcu_access_pointer(bond->current_arp_slave) &&
2574                     !bond_time_in_interval(bond, last_rx, 3)) {
2575                         slave->new_link = BOND_LINK_DOWN;
2576                         commit++;
2577                 }
2578 
2579                 /*
2580                  * Active slave is down if:
2581                  * - more than 2*delta since transmitting OR
2582                  * - (more than 2*delta since receive AND
2583                  *    the bond has an IP address)
2584                  */
2585                 trans_start = dev_trans_start(slave->dev);
2586                 if (bond_is_active_slave(slave) &&
2587                     (!bond_time_in_interval(bond, trans_start, 2) ||
2588                      !bond_time_in_interval(bond, last_rx, 2))) {
2589                         slave->new_link = BOND_LINK_DOWN;
2590                         commit++;
2591                 }
2592         }
2593 
2594         return commit;
2595 }
2596 
2597 /*
2598  * Called to commit link state changes noted by inspection step of
2599  * active-backup mode ARP monitor.
2600  *
2601  * Called with RTNL hold.
2602  */
2603 static void bond_ab_arp_commit(struct bonding *bond)
2604 {
2605         unsigned long trans_start;
2606         struct list_head *iter;
2607         struct slave *slave;
2608 
2609         bond_for_each_slave(bond, slave, iter) {
2610                 switch (slave->new_link) {
2611                 case BOND_LINK_NOCHANGE:
2612                         continue;
2613 
2614                 case BOND_LINK_UP:
2615                         trans_start = dev_trans_start(slave->dev);
2616                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2617                             (!rtnl_dereference(bond->curr_active_slave) &&
2618                              bond_time_in_interval(bond, trans_start, 1))) {
2619                                 struct slave *current_arp_slave;
2620 
2621                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2622                                 slave->link = BOND_LINK_UP;
2623                                 if (current_arp_slave) {
2624                                         bond_set_slave_inactive_flags(
2625                                                 current_arp_slave,
2626                                                 BOND_SLAVE_NOTIFY_NOW);
2627                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2628                                 }
2629 
2630                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2631                                             slave->dev->name);
2632 
2633                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2634                                     (slave == bond->primary_slave))
2635                                         goto do_failover;
2636 
2637                         }
2638 
2639                         continue;
2640 
2641                 case BOND_LINK_DOWN:
2642                         if (slave->link_failure_count < UINT_MAX)
2643                                 slave->link_failure_count++;
2644 
2645                         slave->link = BOND_LINK_DOWN;
2646                         bond_set_slave_inactive_flags(slave,
2647                                                       BOND_SLAVE_NOTIFY_NOW);
2648 
2649                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2650                                     slave->dev->name);
2651 
2652                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2653                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2654                                 goto do_failover;
2655                         }
2656 
2657                         continue;
2658 
2659                 default:
2660                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2661                                    slave->new_link, slave->dev->name);
2662                         continue;
2663                 }
2664 
2665 do_failover:
2666                 ASSERT_RTNL();
2667                 block_netpoll_tx();
2668                 write_lock_bh(&bond->curr_slave_lock);
2669                 bond_select_active_slave(bond);
2670                 write_unlock_bh(&bond->curr_slave_lock);
2671                 unblock_netpoll_tx();
2672         }
2673 
2674         bond_set_carrier(bond);
2675 }
2676 
2677 /*
2678  * Send ARP probes for active-backup mode ARP monitor.
2679  *
2680  * Called with rcu_read_lock hold.
2681  */
2682 static bool bond_ab_arp_probe(struct bonding *bond)
2683 {
2684         struct slave *slave, *before = NULL, *new_slave = NULL,
2685                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2686                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2687         struct list_head *iter;
2688         bool found = false;
2689         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2690 
2691         if (curr_arp_slave && curr_active_slave)
2692                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2693                             curr_arp_slave->dev->name,
2694                             curr_active_slave->dev->name);
2695 
2696         if (curr_active_slave) {
2697                 bond_arp_send_all(bond, curr_active_slave);
2698                 return should_notify_rtnl;
2699         }
2700 
2701         /* if we don't have a curr_active_slave, search for the next available
2702          * backup slave from the current_arp_slave and make it the candidate
2703          * for becoming the curr_active_slave
2704          */
2705 
2706         if (!curr_arp_slave) {
2707                 curr_arp_slave = bond_first_slave_rcu(bond);
2708                 if (!curr_arp_slave)
2709                         return should_notify_rtnl;
2710         }
2711 
2712         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2713 
2714         bond_for_each_slave_rcu(bond, slave, iter) {
2715                 if (!found && !before && bond_slave_is_up(slave))
2716                         before = slave;
2717 
2718                 if (found && !new_slave && bond_slave_is_up(slave))
2719                         new_slave = slave;
2720                 /* if the link state is up at this point, we
2721                  * mark it down - this can happen if we have
2722                  * simultaneous link failures and
2723                  * reselect_active_interface doesn't make this
2724                  * one the current slave so it is still marked
2725                  * up when it is actually down
2726                  */
2727                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2728                         slave->link = BOND_LINK_DOWN;
2729                         if (slave->link_failure_count < UINT_MAX)
2730                                 slave->link_failure_count++;
2731 
2732                         bond_set_slave_inactive_flags(slave,
2733                                                       BOND_SLAVE_NOTIFY_LATER);
2734 
2735                         netdev_info(bond->dev, "backup interface %s is now down\n",
2736                                     slave->dev->name);
2737                 }
2738                 if (slave == curr_arp_slave)
2739                         found = true;
2740         }
2741 
2742         if (!new_slave && before)
2743                 new_slave = before;
2744 
2745         if (!new_slave)
2746                 goto check_state;
2747 
2748         new_slave->link = BOND_LINK_BACK;
2749         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2750         bond_arp_send_all(bond, new_slave);
2751         new_slave->last_link_up = jiffies;
2752         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2753 
2754 check_state:
2755         bond_for_each_slave_rcu(bond, slave, iter) {
2756                 if (slave->should_notify) {
2757                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2758                         break;
2759                 }
2760         }
2761         return should_notify_rtnl;
2762 }
2763 
2764 static void bond_activebackup_arp_mon(struct work_struct *work)
2765 {
2766         struct bonding *bond = container_of(work, struct bonding,
2767                                             arp_work.work);
2768         bool should_notify_peers = false;
2769         bool should_notify_rtnl = false;
2770         int delta_in_ticks;
2771 
2772         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2773 
2774         if (!bond_has_slaves(bond))
2775                 goto re_arm;
2776 
2777         rcu_read_lock();
2778 
2779         should_notify_peers = bond_should_notify_peers(bond);
2780 
2781         if (bond_ab_arp_inspect(bond)) {
2782                 rcu_read_unlock();
2783 
2784                 /* Race avoidance with bond_close flush of workqueue */
2785                 if (!rtnl_trylock()) {
2786                         delta_in_ticks = 1;
2787                         should_notify_peers = false;
2788                         goto re_arm;
2789                 }
2790 
2791                 bond_ab_arp_commit(bond);
2792 
2793                 rtnl_unlock();
2794                 rcu_read_lock();
2795         }
2796 
2797         should_notify_rtnl = bond_ab_arp_probe(bond);
2798         rcu_read_unlock();
2799 
2800 re_arm:
2801         if (bond->params.arp_interval)
2802                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2803 
2804         if (should_notify_peers || should_notify_rtnl) {
2805                 if (!rtnl_trylock())
2806                         return;
2807 
2808                 if (should_notify_peers)
2809                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2810                                                  bond->dev);
2811                 if (should_notify_rtnl)
2812                         bond_slave_state_notify(bond);
2813 
2814                 rtnl_unlock();
2815         }
2816 }
2817 
2818 /*-------------------------- netdev event handling --------------------------*/
2819 
2820 /*
2821  * Change device name
2822  */
2823 static int bond_event_changename(struct bonding *bond)
2824 {
2825         bond_remove_proc_entry(bond);
2826         bond_create_proc_entry(bond);
2827 
2828         bond_debug_reregister(bond);
2829 
2830         return NOTIFY_DONE;
2831 }
2832 
2833 static int bond_master_netdev_event(unsigned long event,
2834                                     struct net_device *bond_dev)
2835 {
2836         struct bonding *event_bond = netdev_priv(bond_dev);
2837 
2838         switch (event) {
2839         case NETDEV_CHANGENAME:
2840                 return bond_event_changename(event_bond);
2841         case NETDEV_UNREGISTER:
2842                 bond_remove_proc_entry(event_bond);
2843                 break;
2844         case NETDEV_REGISTER:
2845                 bond_create_proc_entry(event_bond);
2846                 break;
2847         case NETDEV_NOTIFY_PEERS:
2848                 if (event_bond->send_peer_notif)
2849                         event_bond->send_peer_notif--;
2850                 break;
2851         default:
2852                 break;
2853         }
2854 
2855         return NOTIFY_DONE;
2856 }
2857 
2858 static int bond_slave_netdev_event(unsigned long event,
2859                                    struct net_device *slave_dev)
2860 {
2861         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2862         struct bonding *bond;
2863         struct net_device *bond_dev;
2864         u32 old_speed;
2865         u8 old_duplex;
2866 
2867         /* A netdev event can be generated while enslaving a device
2868          * before netdev_rx_handler_register is called in which case
2869          * slave will be NULL
2870          */
2871         if (!slave)
2872                 return NOTIFY_DONE;
2873         bond_dev = slave->bond->dev;
2874         bond = slave->bond;
2875 
2876         switch (event) {
2877         case NETDEV_UNREGISTER:
2878                 if (bond_dev->type != ARPHRD_ETHER)
2879                         bond_release_and_destroy(bond_dev, slave_dev);
2880                 else
2881                         bond_release(bond_dev, slave_dev);
2882                 break;
2883         case NETDEV_UP:
2884         case NETDEV_CHANGE:
2885                 old_speed = slave->speed;
2886                 old_duplex = slave->duplex;
2887 
2888                 bond_update_speed_duplex(slave);
2889 
2890                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2891                         if (old_speed != slave->speed)
2892                                 bond_3ad_adapter_speed_changed(slave);
2893                         if (old_duplex != slave->duplex)
2894                                 bond_3ad_adapter_duplex_changed(slave);
2895                 }
2896                 break;
2897         case NETDEV_DOWN:
2898                 /*
2899                  * ... Or is it this?
2900                  */
2901                 break;
2902         case NETDEV_CHANGEMTU:
2903                 /*
2904                  * TODO: Should slaves be allowed to
2905                  * independently alter their MTU?  For
2906                  * an active-backup bond, slaves need
2907                  * not be the same type of device, so
2908                  * MTUs may vary.  For other modes,
2909                  * slaves arguably should have the
2910                  * same MTUs. To do this, we'd need to
2911                  * take over the slave's change_mtu
2912                  * function for the duration of their
2913                  * servitude.
2914                  */
2915                 break;
2916         case NETDEV_CHANGENAME:
2917                 /* we don't care if we don't have primary set */
2918                 if (!bond_uses_primary(bond) ||
2919                     !bond->params.primary[0])
2920                         break;
2921 
2922                 if (slave == bond->primary_slave) {
2923                         /* slave's name changed - he's no longer primary */
2924                         bond->primary_slave = NULL;
2925                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2926                         /* we have a new primary slave */
2927                         bond->primary_slave = slave;
2928                 } else { /* we didn't change primary - exit */
2929                         break;
2930                 }
2931 
2932                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2933                             bond->primary_slave ? slave_dev->name : "none");
2934 
2935                 block_netpoll_tx();
2936                 write_lock_bh(&bond->curr_slave_lock);
2937                 bond_select_active_slave(bond);
2938                 write_unlock_bh(&bond->curr_slave_lock);
2939                 unblock_netpoll_tx();
2940                 break;
2941         case NETDEV_FEAT_CHANGE:
2942                 bond_compute_features(bond);
2943                 break;
2944         case NETDEV_RESEND_IGMP:
2945                 /* Propagate to master device */
2946                 call_netdevice_notifiers(event, slave->bond->dev);
2947                 break;
2948         default:
2949                 break;
2950         }
2951 
2952         return NOTIFY_DONE;
2953 }
2954 
2955 /*
2956  * bond_netdev_event: handle netdev notifier chain events.
2957  *
2958  * This function receives events for the netdev chain.  The caller (an
2959  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2960  * locks for us to safely manipulate the slave devices (RTNL lock,
2961  * dev_probe_lock).
2962  */
2963 static int bond_netdev_event(struct notifier_block *this,
2964                              unsigned long event, void *ptr)
2965 {
2966         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2967 
2968         netdev_dbg(event_dev, "event: %lx\n", event);
2969 
2970         if (!(event_dev->priv_flags & IFF_BONDING))
2971                 return NOTIFY_DONE;
2972 
2973         if (event_dev->flags & IFF_MASTER) {
2974                 netdev_dbg(event_dev, "IFF_MASTER\n");
2975                 return bond_master_netdev_event(event, event_dev);
2976         }
2977 
2978         if (event_dev->flags & IFF_SLAVE) {
2979                 netdev_dbg(event_dev, "IFF_SLAVE\n");
2980                 return bond_slave_netdev_event(event, event_dev);
2981         }
2982 
2983         return NOTIFY_DONE;
2984 }
2985 
2986 static struct notifier_block bond_netdev_notifier = {
2987         .notifier_call = bond_netdev_event,
2988 };
2989 
2990 /*---------------------------- Hashing Policies -----------------------------*/
2991 
2992 /* L2 hash helper */
2993 static inline u32 bond_eth_hash(struct sk_buff *skb)
2994 {
2995         struct ethhdr *ep, hdr_tmp;
2996 
2997         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
2998         if (ep)
2999                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3000         return 0;
3001 }
3002 
3003 /* Extract the appropriate headers based on bond's xmit policy */
3004 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3005                               struct flow_keys *fk)
3006 {
3007         const struct ipv6hdr *iph6;
3008         const struct iphdr *iph;
3009         int noff, proto = -1;
3010 
3011         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3012                 return skb_flow_dissect(skb, fk);
3013 
3014         fk->ports = 0;
3015         noff = skb_network_offset(skb);
3016         if (skb->protocol == htons(ETH_P_IP)) {
3017                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3018                         return false;
3019                 iph = ip_hdr(skb);
3020                 fk->src = iph->saddr;
3021                 fk->dst = iph->daddr;
3022                 noff += iph->ihl << 2;
3023                 if (!ip_is_fragment(iph))
3024                         proto = iph->protocol;
3025         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3026                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3027                         return false;
3028                 iph6 = ipv6_hdr(skb);
3029                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
3030                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
3031                 noff += sizeof(*iph6);
3032                 proto = iph6->nexthdr;
3033         } else {
3034                 return false;
3035         }
3036         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3037                 fk->ports = skb_flow_get_ports(skb, noff, proto);
3038 
3039         return true;
3040 }
3041 
3042 /**
3043  * bond_xmit_hash - generate a hash value based on the xmit policy
3044  * @bond: bonding device
3045  * @skb: buffer to use for headers
3046  *
3047  * This function will extract the necessary headers from the skb buffer and use
3048  * them to generate a hash based on the xmit_policy set in the bonding device
3049  */
3050 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3051 {
3052         struct flow_keys flow;
3053         u32 hash;
3054 
3055         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3056             !bond_flow_dissect(bond, skb, &flow))
3057                 return bond_eth_hash(skb);
3058 
3059         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3060             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3061                 hash = bond_eth_hash(skb);
3062         else
3063                 hash = (__force u32)flow.ports;
3064         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3065         hash ^= (hash >> 16);
3066         hash ^= (hash >> 8);
3067 
3068         return hash;
3069 }
3070 
3071 /*-------------------------- Device entry points ----------------------------*/
3072 
3073 static void bond_work_init_all(struct bonding *bond)
3074 {
3075         INIT_DELAYED_WORK(&bond->mcast_work,
3076                           bond_resend_igmp_join_requests_delayed);
3077         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3078         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3079         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3080                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3081         else
3082                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3083         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3084 }
3085 
3086 static void bond_work_cancel_all(struct bonding *bond)
3087 {
3088         cancel_delayed_work_sync(&bond->mii_work);
3089         cancel_delayed_work_sync(&bond->arp_work);
3090         cancel_delayed_work_sync(&bond->alb_work);
3091         cancel_delayed_work_sync(&bond->ad_work);
3092         cancel_delayed_work_sync(&bond->mcast_work);
3093 }
3094 
3095 static int bond_open(struct net_device *bond_dev)
3096 {
3097         struct bonding *bond = netdev_priv(bond_dev);
3098         struct list_head *iter;
3099         struct slave *slave;
3100 
3101         /* reset slave->backup and slave->inactive */
3102         read_lock(&bond->lock);
3103         if (bond_has_slaves(bond)) {
3104                 read_lock(&bond->curr_slave_lock);
3105                 bond_for_each_slave(bond, slave, iter) {
3106                         if (bond_uses_primary(bond) &&
3107                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3108                                 bond_set_slave_inactive_flags(slave,
3109                                                               BOND_SLAVE_NOTIFY_NOW);
3110                         } else {
3111                                 bond_set_slave_active_flags(slave,
3112                                                             BOND_SLAVE_NOTIFY_NOW);
3113                         }
3114                 }
3115                 read_unlock(&bond->curr_slave_lock);
3116         }
3117         read_unlock(&bond->lock);
3118 
3119         bond_work_init_all(bond);
3120 
3121         if (bond_is_lb(bond)) {
3122                 /* bond_alb_initialize must be called before the timer
3123                  * is started.
3124                  */
3125                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3126                         return -ENOMEM;
3127                 if (bond->params.tlb_dynamic_lb)
3128                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3129         }
3130 
3131         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3132                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3133 
3134         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3135                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3136                 bond->recv_probe = bond_arp_rcv;
3137         }
3138 
3139         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3140                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3141                 /* register to receive LACPDUs */
3142                 bond->recv_probe = bond_3ad_lacpdu_recv;
3143                 bond_3ad_initiate_agg_selection(bond, 1);
3144         }
3145 
3146         return 0;
3147 }
3148 
3149 static int bond_close(struct net_device *bond_dev)
3150 {
3151         struct bonding *bond = netdev_priv(bond_dev);
3152 
3153         bond_work_cancel_all(bond);
3154         bond->send_peer_notif = 0;
3155         if (bond_is_lb(bond))
3156                 bond_alb_deinitialize(bond);
3157         bond->recv_probe = NULL;
3158 
3159         return 0;
3160 }
3161 
3162 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3163                                                 struct rtnl_link_stats64 *stats)
3164 {
3165         struct bonding *bond = netdev_priv(bond_dev);
3166         struct rtnl_link_stats64 temp;
3167         struct list_head *iter;
3168         struct slave *slave;
3169 
3170         memset(stats, 0, sizeof(*stats));
3171 
3172         read_lock_bh(&bond->lock);
3173         bond_for_each_slave(bond, slave, iter) {
3174                 const struct rtnl_link_stats64 *sstats =
3175                         dev_get_stats(slave->dev, &temp);
3176 
3177                 stats->rx_packets += sstats->rx_packets;
3178                 stats->rx_bytes += sstats->rx_bytes;
3179                 stats->rx_errors += sstats->rx_errors;
3180                 stats->rx_dropped += sstats->rx_dropped;
3181 
3182                 stats->tx_packets += sstats->tx_packets;
3183                 stats->tx_bytes += sstats->tx_bytes;
3184                 stats->tx_errors += sstats->tx_errors;
3185                 stats->tx_dropped += sstats->tx_dropped;
3186 
3187                 stats->multicast += sstats->multicast;
3188                 stats->collisions += sstats->collisions;
3189 
3190                 stats->rx_length_errors += sstats->rx_length_errors;
3191                 stats->rx_over_errors += sstats->rx_over_errors;
3192                 stats->rx_crc_errors += sstats->rx_crc_errors;
3193                 stats->rx_frame_errors += sstats->rx_frame_errors;
3194                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3195                 stats->rx_missed_errors += sstats->rx_missed_errors;
3196 
3197                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3198                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3199                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3200                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3201                 stats->tx_window_errors += sstats->tx_window_errors;
3202         }
3203         read_unlock_bh(&bond->lock);
3204 
3205         return stats;
3206 }
3207 
3208 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3209 {
3210         struct bonding *bond = netdev_priv(bond_dev);
3211         struct net_device *slave_dev = NULL;
3212         struct ifbond k_binfo;
3213         struct ifbond __user *u_binfo = NULL;
3214         struct ifslave k_sinfo;
3215         struct ifslave __user *u_sinfo = NULL;
3216         struct mii_ioctl_data *mii = NULL;
3217         struct bond_opt_value newval;
3218         struct net *net;
3219         int res = 0;
3220 
3221         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3222 
3223         switch (cmd) {
3224         case SIOCGMIIPHY:
3225                 mii = if_mii(ifr);
3226                 if (!mii)
3227                         return -EINVAL;
3228 
3229                 mii->phy_id = 0;
3230                 /* Fall Through */
3231         case SIOCGMIIREG:
3232                 /*
3233                  * We do this again just in case we were called by SIOCGMIIREG
3234                  * instead of SIOCGMIIPHY.
3235                  */
3236                 mii = if_mii(ifr);
3237                 if (!mii)
3238                         return -EINVAL;
3239 
3240 
3241                 if (mii->reg_num == 1) {
3242                         mii->val_out = 0;
3243                         read_lock(&bond->lock);
3244                         read_lock(&bond->curr_slave_lock);
3245                         if (netif_carrier_ok(bond->dev))
3246                                 mii->val_out = BMSR_LSTATUS;
3247 
3248                         read_unlock(&bond->curr_slave_lock);
3249                         read_unlock(&bond->lock);
3250                 }
3251 
3252                 return 0;
3253         case BOND_INFO_QUERY_OLD:
3254         case SIOCBONDINFOQUERY:
3255                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3256 
3257                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3258                         return -EFAULT;
3259 
3260                 res = bond_info_query(bond_dev, &k_binfo);
3261                 if (res == 0 &&
3262                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3263                         return -EFAULT;
3264 
3265                 return res;
3266         case BOND_SLAVE_INFO_QUERY_OLD:
3267         case SIOCBONDSLAVEINFOQUERY:
3268                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3269 
3270                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3271                         return -EFAULT;
3272 
3273                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3274                 if (res == 0 &&
3275                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3276                         return -EFAULT;
3277 
3278                 return res;
3279         default:
3280                 /* Go on */
3281                 break;
3282         }
3283 
3284         net = dev_net(bond_dev);
3285 
3286         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3287                 return -EPERM;
3288 
3289         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3290 
3291         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3292 
3293         if (!slave_dev)
3294                 return -ENODEV;
3295 
3296         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3297         switch (cmd) {
3298         case BOND_ENSLAVE_OLD:
3299         case SIOCBONDENSLAVE:
3300                 res = bond_enslave(bond_dev, slave_dev);
3301                 break;
3302         case BOND_RELEASE_OLD:
3303         case SIOCBONDRELEASE:
3304                 res = bond_release(bond_dev, slave_dev);
3305                 break;
3306         case BOND_SETHWADDR_OLD:
3307         case SIOCBONDSETHWADDR:
3308                 bond_set_dev_addr(bond_dev, slave_dev);
3309                 res = 0;
3310                 break;
3311         case BOND_CHANGE_ACTIVE_OLD:
3312         case SIOCBONDCHANGEACTIVE:
3313                 bond_opt_initstr(&newval, slave_dev->name);
3314                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3315                 break;
3316         default:
3317                 res = -EOPNOTSUPP;
3318         }
3319 
3320         return res;
3321 }
3322 
3323 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3324 {
3325         struct bonding *bond = netdev_priv(bond_dev);
3326 
3327         if (change & IFF_PROMISC)
3328                 bond_set_promiscuity(bond,
3329                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3330 
3331         if (change & IFF_ALLMULTI)
3332                 bond_set_allmulti(bond,
3333                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3334 }
3335 
3336 static void bond_set_rx_mode(struct net_device *bond_dev)
3337 {
3338         struct bonding *bond = netdev_priv(bond_dev);
3339         struct list_head *iter;
3340         struct slave *slave;
3341 
3342 
3343         rcu_read_lock();
3344         if (bond_uses_primary(bond)) {
3345                 slave = rcu_dereference(bond->curr_active_slave);
3346                 if (slave) {
3347                         dev_uc_sync(slave->dev, bond_dev);
3348                         dev_mc_sync(slave->dev, bond_dev);
3349                 }
3350         } else {
3351                 bond_for_each_slave_rcu(bond, slave, iter) {
3352                         dev_uc_sync_multiple(slave->dev, bond_dev);
3353                         dev_mc_sync_multiple(slave->dev, bond_dev);
3354                 }
3355         }
3356         rcu_read_unlock();
3357 }
3358 
3359 static int bond_neigh_init(struct neighbour *n)
3360 {
3361         struct bonding *bond = netdev_priv(n->dev);
3362         const struct net_device_ops *slave_ops;
3363         struct neigh_parms parms;
3364         struct slave *slave;
3365         int ret;
3366 
3367         slave = bond_first_slave(bond);
3368         if (!slave)
3369                 return 0;
3370         slave_ops = slave->dev->netdev_ops;
3371         if (!slave_ops->ndo_neigh_setup)
3372                 return 0;
3373 
3374         parms.neigh_setup = NULL;
3375         parms.neigh_cleanup = NULL;
3376         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3377         if (ret)
3378                 return ret;
3379 
3380         /*
3381          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3382          * after the last slave has been detached.  Assumes that all slaves
3383          * utilize the same neigh_cleanup (true at this writing as only user
3384          * is ipoib).
3385          */
3386         n->parms->neigh_cleanup = parms.neigh_cleanup;
3387 
3388         if (!parms.neigh_setup)
3389                 return 0;
3390 
3391         return parms.neigh_setup(n);
3392 }
3393 
3394 /*
3395  * The bonding ndo_neigh_setup is called at init time beofre any
3396  * slave exists. So we must declare proxy setup function which will
3397  * be used at run time to resolve the actual slave neigh param setup.
3398  *
3399  * It's also called by master devices (such as vlans) to setup their
3400  * underlying devices. In that case - do nothing, we're already set up from
3401  * our init.
3402  */
3403 static int bond_neigh_setup(struct net_device *dev,
3404                             struct neigh_parms *parms)
3405 {
3406         /* modify only our neigh_parms */
3407         if (parms->dev == dev)
3408                 parms->neigh_setup = bond_neigh_init;
3409 
3410         return 0;
3411 }
3412 
3413 /*
3414  * Change the MTU of all of a master's slaves to match the master
3415  */
3416 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3417 {
3418         struct bonding *bond = netdev_priv(bond_dev);
3419         struct slave *slave, *rollback_slave;
3420         struct list_head *iter;
3421         int res = 0;
3422 
3423         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3424 
3425         /* Can't hold bond->lock with bh disabled here since
3426          * some base drivers panic. On the other hand we can't
3427          * hold bond->lock without bh disabled because we'll
3428          * deadlock. The only solution is to rely on the fact
3429          * that we're under rtnl_lock here, and the slaves
3430          * list won't change. This doesn't solve the problem
3431          * of setting the slave's MTU while it is
3432          * transmitting, but the assumption is that the base
3433          * driver can handle that.
3434          *
3435          * TODO: figure out a way to safely iterate the slaves
3436          * list, but without holding a lock around the actual
3437          * call to the base driver.
3438          */
3439 
3440         bond_for_each_slave(bond, slave, iter) {
3441                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3442                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3443 
3444                 res = dev_set_mtu(slave->dev, new_mtu);
3445 
3446                 if (res) {
3447                         /* If we failed to set the slave's mtu to the new value
3448                          * we must abort the operation even in ACTIVE_BACKUP
3449                          * mode, because if we allow the backup slaves to have
3450                          * different mtu values than the active slave we'll
3451                          * need to change their mtu when doing a failover. That
3452                          * means changing their mtu from timer context, which
3453                          * is probably not a good idea.
3454                          */
3455                         netdev_dbg(bond_dev, "err %d %s\n", res,
3456                                    slave->dev->name);
3457                         goto unwind;
3458                 }
3459         }
3460 
3461         bond_dev->mtu = new_mtu;
3462 
3463         return 0;
3464 
3465 unwind:
3466         /* unwind from head to the slave that failed */
3467         bond_for_each_slave(bond, rollback_slave, iter) {
3468                 int tmp_res;
3469 
3470                 if (rollback_slave == slave)
3471                         break;
3472 
3473                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3474                 if (tmp_res) {
3475                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3476                                    tmp_res, rollback_slave->dev->name);
3477                 }
3478         }
3479 
3480         return res;
3481 }
3482 
3483 /*
3484  * Change HW address
3485  *
3486  * Note that many devices must be down to change the HW address, and
3487  * downing the master releases all slaves.  We can make bonds full of
3488  * bonding devices to test this, however.
3489  */
3490 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3491 {
3492         struct bonding *bond = netdev_priv(bond_dev);
3493         struct slave *slave, *rollback_slave;
3494         struct sockaddr *sa = addr, tmp_sa;
3495         struct list_head *iter;
3496         int res = 0;
3497 
3498         if (BOND_MODE(bond) == BOND_MODE_ALB)
3499                 return bond_alb_set_mac_address(bond_dev, addr);
3500 
3501 
3502         netdev_dbg(bond_dev, "bond=%p\n", bond);
3503 
3504         /* If fail_over_mac is enabled, do nothing and return success.
3505          * Returning an error causes ifenslave to fail.
3506          */
3507         if (bond->params.fail_over_mac &&
3508             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3509                 return 0;
3510 
3511         if (!is_valid_ether_addr(sa->sa_data))
3512                 return -EADDRNOTAVAIL;
3513 
3514         /* Can't hold bond->lock with bh disabled here since
3515          * some base drivers panic. On the other hand we can't
3516          * hold bond->lock without bh disabled because we'll
3517          * deadlock. The only solution is to rely on the fact
3518          * that we're under rtnl_lock here, and the slaves
3519          * list won't change. This doesn't solve the problem
3520          * of setting the slave's hw address while it is
3521          * transmitting, but the assumption is that the base
3522          * driver can handle that.
3523          *
3524          * TODO: figure out a way to safely iterate the slaves
3525          * list, but without holding a lock around the actual
3526          * call to the base driver.
3527          */
3528 
3529         bond_for_each_slave(bond, slave, iter) {
3530                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3531                 res = dev_set_mac_address(slave->dev, addr);
3532                 if (res) {
3533                         /* TODO: consider downing the slave
3534                          * and retry ?
3535                          * User should expect communications
3536                          * breakage anyway until ARP finish
3537                          * updating, so...
3538                          */
3539                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3540                         goto unwind;
3541                 }
3542         }
3543 
3544         /* success */
3545         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3546         return 0;
3547 
3548 unwind:
3549         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3550         tmp_sa.sa_family = bond_dev->type;
3551 
3552         /* unwind from head to the slave that failed */
3553         bond_for_each_slave(bond, rollback_slave, iter) {
3554                 int tmp_res;
3555 
3556                 if (rollback_slave == slave)
3557                         break;
3558 
3559                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3560                 if (tmp_res) {
3561                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3562                                    tmp_res, rollback_slave->dev->name);
3563                 }
3564         }
3565 
3566         return res;
3567 }
3568 
3569 /**
3570  * bond_xmit_slave_id - transmit skb through slave with slave_id
3571  * @bond: bonding device that is transmitting
3572  * @skb: buffer to transmit
3573  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3574  *
3575  * This function tries to transmit through slave with slave_id but in case
3576  * it fails, it tries to find the first available slave for transmission.
3577  * The skb is consumed in all cases, thus the function is void.
3578  */
3579 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3580 {
3581         struct list_head *iter;
3582         struct slave *slave;
3583         int i = slave_id;
3584 
3585         /* Here we start from the slave with slave_id */
3586         bond_for_each_slave_rcu(bond, slave, iter) {
3587                 if (--i < 0) {
3588                         if (bond_slave_can_tx(slave)) {
3589                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3590                                 return;
3591                         }
3592                 }
3593         }
3594 
3595         /* Here we start from the first slave up to slave_id */
3596         i = slave_id;
3597         bond_for_each_slave_rcu(bond, slave, iter) {
3598                 if (--i < 0)
3599                         break;
3600                 if (bond_slave_can_tx(slave)) {
3601                         bond_dev_queue_xmit(bond, skb, slave->dev);
3602                         return;
3603                 }
3604         }
3605         /* no slave that can tx has been found */
3606         dev_kfree_skb_any(skb);
3607 }
3608 
3609 /**
3610  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3611  * @bond: bonding device to use
3612  *
3613  * Based on the value of the bonding device's packets_per_slave parameter
3614  * this function generates a slave id, which is usually used as the next
3615  * slave to transmit through.
3616  */
3617 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3618 {
3619         u32 slave_id;
3620         struct reciprocal_value reciprocal_packets_per_slave;
3621         int packets_per_slave = bond->params.packets_per_slave;
3622 
3623         switch (packets_per_slave) {
3624         case 0:
3625                 slave_id = prandom_u32();
3626                 break;
3627         case 1:
3628                 slave_id = bond->rr_tx_counter;
3629                 break;
3630         default:
3631                 reciprocal_packets_per_slave =
3632                         bond->params.reciprocal_packets_per_slave;
3633                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3634                                              reciprocal_packets_per_slave);
3635                 break;
3636         }
3637         bond->rr_tx_counter++;
3638 
3639         return slave_id;
3640 }
3641 
3642 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3643 {
3644         struct bonding *bond = netdev_priv(bond_dev);
3645         struct iphdr *iph = ip_hdr(skb);
3646         struct slave *slave;
3647         u32 slave_id;
3648 
3649         /* Start with the curr_active_slave that joined the bond as the
3650          * default for sending IGMP traffic.  For failover purposes one
3651          * needs to maintain some consistency for the interface that will
3652          * send the join/membership reports.  The curr_active_slave found
3653          * will send all of this type of traffic.
3654          */
3655         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3656                 slave = rcu_dereference(bond->curr_active_slave);
3657                 if (slave && bond_slave_can_tx(slave))
3658                         bond_dev_queue_xmit(bond, skb, slave->dev);
3659                 else
3660                         bond_xmit_slave_id(bond, skb, 0);
3661         } else {
3662                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3663 
3664                 if (likely(slave_cnt)) {
3665                         slave_id = bond_rr_gen_slave_id(bond);
3666                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3667                 } else {
3668                         dev_kfree_skb_any(skb);
3669                 }
3670         }
3671 
3672         return NETDEV_TX_OK;
3673 }
3674 
3675 /*
3676  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3677  * the bond has a usable interface.
3678  */
3679 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3680 {
3681         struct bonding *bond = netdev_priv(bond_dev);
3682         struct slave *slave;
3683 
3684         slave = rcu_dereference(bond->curr_active_slave);
3685         if (slave)
3686                 bond_dev_queue_xmit(bond, skb, slave->dev);
3687         else
3688                 dev_kfree_skb_any(skb);
3689 
3690         return NETDEV_TX_OK;
3691 }
3692 
3693 /* In bond_xmit_xor() , we determine the output device by using a pre-
3694  * determined xmit_hash_policy(), If the selected device is not enabled,
3695  * find the next active slave.
3696  */
3697 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3698 {
3699         struct bonding *bond = netdev_priv(bond_dev);
3700         int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3701 
3702         if (likely(slave_cnt))
3703                 bond_xmit_slave_id(bond, skb,
3704                                    bond_xmit_hash(bond, skb) % slave_cnt);
3705         else
3706                 dev_kfree_skb_any(skb);
3707 
3708         return NETDEV_TX_OK;
3709 }
3710 
3711 /* in broadcast mode, we send everything to all usable interfaces. */
3712 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3713 {
3714         struct bonding *bond = netdev_priv(bond_dev);
3715         struct slave *slave = NULL;
3716         struct list_head *iter;
3717 
3718         bond_for_each_slave_rcu(bond, slave, iter) {
3719                 if (bond_is_last_slave(bond, slave))
3720                         break;
3721                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3722                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3723 
3724                         if (!skb2) {
3725                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3726                                                     bond_dev->name, __func__);
3727                                 continue;
3728                         }
3729                         /* bond_dev_queue_xmit always returns 0 */
3730                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3731                 }
3732         }
3733         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3734                 bond_dev_queue_xmit(bond, skb, slave->dev);
3735         else
3736                 dev_kfree_skb_any(skb);
3737 
3738         return NETDEV_TX_OK;
3739 }
3740 
3741 /*------------------------- Device initialization ---------------------------*/
3742 
3743 /*
3744  * Lookup the slave that corresponds to a qid
3745  */
3746 static inline int bond_slave_override(struct bonding *bond,
3747                                       struct sk_buff *skb)
3748 {
3749         struct slave *slave = NULL;
3750         struct list_head *iter;
3751 
3752         if (!skb->queue_mapping)
3753                 return 1;
3754 
3755         /* Find out if any slaves have the same mapping as this skb. */
3756         bond_for_each_slave_rcu(bond, slave, iter) {
3757                 if (slave->queue_id == skb->queue_mapping) {
3758                         if (bond_slave_can_tx(slave)) {
3759                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3760                                 return 0;
3761                         }
3762                         /* If the slave isn't UP, use default transmit policy. */
3763                         break;
3764                 }
3765         }
3766 
3767         return 1;
3768 }
3769 
3770 
3771 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3772                              void *accel_priv, select_queue_fallback_t fallback)
3773 {
3774         /*
3775          * This helper function exists to help dev_pick_tx get the correct
3776          * destination queue.  Using a helper function skips a call to
3777          * skb_tx_hash and will put the skbs in the queue we expect on their
3778          * way down to the bonding driver.
3779          */
3780         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3781 
3782         /*
3783          * Save the original txq to restore before passing to the driver
3784          */
3785         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3786 
3787         if (unlikely(txq >= dev->real_num_tx_queues)) {
3788                 do {
3789                         txq -= dev->real_num_tx_queues;
3790                 } while (txq >= dev->real_num_tx_queues);
3791         }
3792         return txq;
3793 }
3794 
3795 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3796 {
3797         struct bonding *bond = netdev_priv(dev);
3798 
3799         if (bond_should_override_tx_queue(bond) &&
3800             !bond_slave_override(bond, skb))
3801                 return NETDEV_TX_OK;
3802 
3803         switch (BOND_MODE(bond)) {
3804         case BOND_MODE_ROUNDROBIN:
3805                 return bond_xmit_roundrobin(skb, dev);
3806         case BOND_MODE_ACTIVEBACKUP:
3807                 return bond_xmit_activebackup(skb, dev);
3808         case BOND_MODE_XOR:
3809                 return bond_xmit_xor(skb, dev);
3810         case BOND_MODE_BROADCAST:
3811                 return bond_xmit_broadcast(skb, dev);
3812         case BOND_MODE_8023AD:
3813                 return bond_3ad_xmit_xor(skb, dev);
3814         case BOND_MODE_ALB:
3815                 return bond_alb_xmit(skb, dev);
3816         case BOND_MODE_TLB:
3817                 return bond_tlb_xmit(skb, dev);
3818         default:
3819                 /* Should never happen, mode already checked */
3820                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3821                 WARN_ON_ONCE(1);
3822                 dev_kfree_skb_any(skb);
3823                 return NETDEV_TX_OK;
3824         }
3825 }
3826 
3827 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3828 {
3829         struct bonding *bond = netdev_priv(dev);
3830         netdev_tx_t ret = NETDEV_TX_OK;
3831 
3832         /*
3833          * If we risk deadlock from transmitting this in the
3834          * netpoll path, tell netpoll to queue the frame for later tx
3835          */
3836         if (unlikely(is_netpoll_tx_blocked(dev)))
3837                 return NETDEV_TX_BUSY;
3838 
3839         rcu_read_lock();
3840         if (bond_has_slaves(bond))
3841                 ret = __bond_start_xmit(skb, dev);
3842         else
3843                 dev_kfree_skb_any(skb);
3844         rcu_read_unlock();
3845 
3846         return ret;
3847 }
3848 
3849 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3850                                      struct ethtool_cmd *ecmd)
3851 {
3852         struct bonding *bond = netdev_priv(bond_dev);
3853         unsigned long speed = 0;
3854         struct list_head *iter;
3855         struct slave *slave;
3856 
3857         ecmd->duplex = DUPLEX_UNKNOWN;
3858         ecmd->port = PORT_OTHER;
3859 
3860         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3861          * do not need to check mode.  Though link speed might not represent
3862          * the true receive or transmit bandwidth (not all modes are symmetric)
3863          * this is an accurate maximum.
3864          */
3865         read_lock(&bond->lock);
3866         bond_for_each_slave(bond, slave, iter) {
3867                 if (bond_slave_can_tx(slave)) {
3868                         if (slave->speed != SPEED_UNKNOWN)
3869                                 speed += slave->speed;
3870                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3871                             slave->duplex != DUPLEX_UNKNOWN)
3872                                 ecmd->duplex = slave->duplex;
3873                 }
3874         }
3875         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3876         read_unlock(&bond->lock);
3877 
3878         return 0;
3879 }
3880 
3881 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3882                                      struct ethtool_drvinfo *drvinfo)
3883 {
3884         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3885         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3886         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3887                  BOND_ABI_VERSION);
3888 }
3889 
3890 static const struct ethtool_ops bond_ethtool_ops = {
3891         .get_drvinfo            = bond_ethtool_get_drvinfo,
3892         .get_settings           = bond_ethtool_get_settings,
3893         .get_link               = ethtool_op_get_link,
3894 };
3895 
3896 static const struct net_device_ops bond_netdev_ops = {
3897         .ndo_init               = bond_init,
3898         .ndo_uninit             = bond_uninit,
3899         .ndo_open               = bond_open,
3900         .ndo_stop               = bond_close,
3901         .ndo_start_xmit         = bond_start_xmit,
3902         .ndo_select_queue       = bond_select_queue,
3903         .ndo_get_stats64        = bond_get_stats,
3904         .ndo_do_ioctl           = bond_do_ioctl,
3905         .ndo_change_rx_flags    = bond_change_rx_flags,
3906         .ndo_set_rx_mode        = bond_set_rx_mode,
3907         .ndo_change_mtu         = bond_change_mtu,
3908         .ndo_set_mac_address    = bond_set_mac_address,
3909         .ndo_neigh_setup        = bond_neigh_setup,
3910         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3911         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3912 #ifdef CONFIG_NET_POLL_CONTROLLER
3913         .ndo_netpoll_setup      = bond_netpoll_setup,
3914         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3915         .ndo_poll_controller    = bond_poll_controller,
3916 #endif
3917         .ndo_add_slave          = bond_enslave,
3918         .ndo_del_slave          = bond_release,
3919         .ndo_fix_features       = bond_fix_features,
3920 };
3921 
3922 static const struct device_type bond_type = {
3923         .name = "bond",
3924 };
3925 
3926 static void bond_destructor(struct net_device *bond_dev)
3927 {
3928         struct bonding *bond = netdev_priv(bond_dev);
3929         if (bond->wq)
3930                 destroy_workqueue(bond->wq);
3931         free_netdev(bond_dev);
3932 }
3933 
3934 void bond_setup(struct net_device *bond_dev)
3935 {
3936         struct bonding *bond = netdev_priv(bond_dev);
3937 
3938         /* initialize rwlocks */
3939         rwlock_init(&bond->lock);
3940         rwlock_init(&bond->curr_slave_lock);
3941         bond->params = bonding_defaults;
3942 
3943         /* Initialize pointers */
3944         bond->dev = bond_dev;
3945 
3946         /* Initialize the device entry points */
3947         ether_setup(bond_dev);
3948         bond_dev->netdev_ops = &bond_netdev_ops;
3949         bond_dev->ethtool_ops = &bond_ethtool_ops;
3950 
3951         bond_dev->destructor = bond_destructor;
3952 
3953         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3954 
3955         /* Initialize the device options */
3956         bond_dev->tx_queue_len = 0;
3957         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3958         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
3959         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3960 
3961         /* don't acquire bond device's netif_tx_lock when
3962          * transmitting */
3963         bond_dev->features |= NETIF_F_LLTX;
3964 
3965         /* By default, we declare the bond to be fully
3966          * VLAN hardware accelerated capable. Special
3967          * care is taken in the various xmit functions
3968          * when there are slaves that are not hw accel
3969          * capable
3970          */
3971 
3972         /* Don't allow bond devices to change network namespaces. */
3973         bond_dev->features |= NETIF_F_NETNS_LOCAL;
3974 
3975         bond_dev->hw_features = BOND_VLAN_FEATURES |
3976                                 NETIF_F_HW_VLAN_CTAG_TX |
3977                                 NETIF_F_HW_VLAN_CTAG_RX |
3978                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3979 
3980         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3981         bond_dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
3982         bond_dev->features |= bond_dev->hw_features;
3983 }
3984 
3985 /*
3986 * Destroy a bonding device.
3987 * Must be under rtnl_lock when this function is called.
3988 */
3989 static void bond_uninit(struct net_device *bond_dev)
3990 {
3991         struct bonding *bond = netdev_priv(bond_dev);
3992         struct list_head *iter;
3993         struct slave *slave;
3994 
3995         bond_netpoll_cleanup(bond_dev);
3996 
3997         /* Release the bonded slaves */
3998         bond_for_each_slave(bond, slave, iter)
3999                 __bond_release_one(bond_dev, slave->dev, true);
4000         netdev_info(bond_dev, "Released all slaves\n");
4001 
4002         list_del(&bond->bond_list);
4003 
4004         bond_debug_unregister(bond);
4005 }
4006 
4007 /*------------------------- Module initialization ---------------------------*/
4008 
4009 static int bond_check_params(struct bond_params *params)
4010 {
4011         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4012         struct bond_opt_value newval;
4013         const struct bond_opt_value *valptr;
4014         int arp_all_targets_value;
4015 
4016         /*
4017          * Convert string parameters.
4018          */
4019         if (mode) {
4020                 bond_opt_initstr(&newval, mode);
4021                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4022                 if (!valptr) {
4023                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4024                         return -EINVAL;
4025                 }
4026                 bond_mode = valptr->value;
4027         }
4028 
4029         if (xmit_hash_policy) {
4030                 if ((bond_mode != BOND_MODE_XOR) &&
4031                     (bond_mode != BOND_MODE_8023AD) &&
4032                     (bond_mode != BOND_MODE_TLB)) {
4033                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4034                                 bond_mode_name(bond_mode));
4035                 } else {
4036                         bond_opt_initstr(&newval, xmit_hash_policy);
4037                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4038                                                 &newval);
4039                         if (!valptr) {
4040                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4041                                        xmit_hash_policy);
4042                                 return -EINVAL;
4043                         }
4044                         xmit_hashtype = valptr->value;
4045                 }
4046         }
4047 
4048         if (lacp_rate) {
4049                 if (bond_mode != BOND_MODE_8023AD) {
4050                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4051                                 bond_mode_name(bond_mode));
4052                 } else {
4053                         bond_opt_initstr(&newval, lacp_rate);
4054                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4055                                                 &newval);
4056                         if (!valptr) {
4057                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4058                                        lacp_rate);
4059                                 return -EINVAL;
4060                         }
4061                         lacp_fast = valptr->value;
4062                 }
4063         }
4064 
4065         if (ad_select) {
4066                 bond_opt_initstr(&newval, ad_select);
4067                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4068                                         &newval);
4069                 if (!valptr) {
4070                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4071                         return -EINVAL;
4072                 }
4073                 params->ad_select = valptr->value;
4074                 if (bond_mode != BOND_MODE_8023AD)
4075                         pr_warn("ad_select param only affects 802.3ad mode\n");
4076         } else {
4077                 params->ad_select = BOND_AD_STABLE;
4078         }
4079 
4080         if (max_bonds < 0) {
4081                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4082                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4083                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4084         }
4085 
4086         if (miimon < 0) {
4087                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4088                         miimon, INT_MAX);
4089                 miimon = 0;
4090         }
4091 
4092         if (updelay < 0) {
4093                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4094                         updelay, INT_MAX);
4095                 updelay = 0;
4096         }
4097 
4098         if (downdelay < 0) {
4099                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4100                         downdelay, INT_MAX);
4101                 downdelay = 0;
4102         }
4103 
4104         if ((use_carrier != 0) && (use_carrier != 1)) {
4105                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4106                         use_carrier);
4107                 use_carrier = 1;
4108         }
4109 
4110         if (num_peer_notif < 0 || num_peer_notif > 255) {
4111                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4112                         num_peer_notif);
4113                 num_peer_notif = 1;
4114         }
4115 
4116         /* reset values for 802.3ad/TLB/ALB */
4117         if (!bond_mode_uses_arp(bond_mode)) {
4118                 if (!miimon) {
4119                         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");
4120                         pr_warn("Forcing miimon to 100msec\n");
4121                         miimon = BOND_DEFAULT_MIIMON;
4122                 }
4123         }
4124 
4125         if (tx_queues < 1 || tx_queues > 255) {
4126                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4127                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4128                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4129         }
4130 
4131         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4132                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4133                         all_slaves_active);
4134                 all_slaves_active = 0;
4135         }
4136 
4137         if (resend_igmp < 0 || resend_igmp > 255) {
4138                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4139                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4140                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4141         }
4142 
4143         bond_opt_initval(&newval, packets_per_slave);
4144         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4145                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4146                         packets_per_slave, USHRT_MAX);
4147                 packets_per_slave = 1;
4148         }
4149 
4150         if (bond_mode == BOND_MODE_ALB) {
4151                 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",
4152                           updelay);
4153         }
4154 
4155         if (!miimon) {
4156                 if (updelay || downdelay) {
4157                         /* just warn the user the up/down delay will have
4158                          * no effect since miimon is zero...
4159                          */
4160                         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",
4161                                 updelay, downdelay);
4162                 }
4163         } else {
4164                 /* don't allow arp monitoring */
4165                 if (arp_interval) {
4166                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4167                                 miimon, arp_interval);
4168                         arp_interval = 0;
4169                 }
4170 
4171                 if ((updelay % miimon) != 0) {
4172                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4173                                 updelay, miimon, (updelay / miimon) * miimon);
4174                 }
4175 
4176                 updelay /= miimon;
4177 
4178                 if ((downdelay % miimon) != 0) {
4179                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4180                                 downdelay, miimon,
4181                                 (downdelay / miimon) * miimon);
4182                 }
4183 
4184                 downdelay /= miimon;
4185         }
4186 
4187         if (arp_interval < 0) {
4188                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4189                         arp_interval, INT_MAX);
4190                 arp_interval = 0;
4191         }
4192 
4193         for (arp_ip_count = 0, i = 0;
4194              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4195                 /* not complete check, but should be good enough to
4196                    catch mistakes */
4197                 __be32 ip;
4198                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4199                     !bond_is_ip_target_ok(ip)) {
4200                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4201                                 arp_ip_target[i]);
4202                         arp_interval = 0;
4203                 } else {
4204                         if (bond_get_targets_ip(arp_target, ip) == -1)
4205                                 arp_target[arp_ip_count++] = ip;
4206                         else
4207                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4208                                         &ip);
4209                 }
4210         }
4211 
4212         if (arp_interval && !arp_ip_count) {
4213                 /* don't allow arping if no arp_ip_target given... */
4214                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4215                         arp_interval);
4216                 arp_interval = 0;
4217         }
4218 
4219         if (arp_validate) {
4220                 if (!arp_interval) {
4221                         pr_err("arp_validate requires arp_interval\n");
4222                         return -EINVAL;
4223                 }
4224 
4225                 bond_opt_initstr(&newval, arp_validate);
4226                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4227                                         &newval);
4228                 if (!valptr) {
4229                         pr_err("Error: invalid arp_validate \"%s\"\n",
4230                                arp_validate);
4231                         return -EINVAL;
4232                 }
4233                 arp_validate_value = valptr->value;
4234         } else {
4235                 arp_validate_value = 0;
4236         }
4237 
4238         arp_all_targets_value = 0;
4239         if (arp_all_targets) {
4240                 bond_opt_initstr(&newval, arp_all_targets);
4241                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4242                                         &newval);
4243                 if (!valptr) {
4244                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4245                                arp_all_targets);
4246                         arp_all_targets_value = 0;
4247                 } else {
4248                         arp_all_targets_value = valptr->value;
4249                 }
4250         }
4251 
4252         if (miimon) {
4253                 pr_info("MII link monitoring set to %d ms\n", miimon);
4254         } else if (arp_interval) {
4255                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4256                                           arp_validate_value);
4257                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4258                         arp_interval, valptr->string, arp_ip_count);
4259 
4260                 for (i = 0; i < arp_ip_count; i++)
4261                         pr_cont(" %s", arp_ip_target[i]);
4262 
4263                 pr_cont("\n");
4264 
4265         } else if (max_bonds) {
4266                 /* miimon and arp_interval not set, we need one so things
4267                  * work as expected, see bonding.txt for details
4268                  */
4269                 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");
4270         }
4271 
4272         if (primary && !bond_mode_uses_primary(bond_mode)) {
4273                 /* currently, using a primary only makes sense
4274                  * in active backup, TLB or ALB modes
4275                  */
4276                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4277                         primary, bond_mode_name(bond_mode));
4278                 primary = NULL;
4279         }
4280 
4281         if (primary && primary_reselect) {
4282                 bond_opt_initstr(&newval, primary_reselect);
4283                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4284                                         &newval);
4285                 if (!valptr) {
4286                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4287                                primary_reselect);
4288                         return -EINVAL;
4289                 }
4290                 primary_reselect_value = valptr->value;
4291         } else {
4292                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4293         }
4294 
4295         if (fail_over_mac) {
4296                 bond_opt_initstr(&newval, fail_over_mac);
4297                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4298                                         &newval);
4299                 if (!valptr) {
4300                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4301                                fail_over_mac);
4302                         return -EINVAL;
4303                 }
4304                 fail_over_mac_value = valptr->value;
4305                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4306                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4307         } else {
4308                 fail_over_mac_value = BOND_FOM_NONE;
4309         }
4310 
4311         if (lp_interval == 0) {
4312                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4313                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4314                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4315         }
4316 
4317         /* fill params struct with the proper values */
4318         params->mode = bond_mode;
4319         params->xmit_policy = xmit_hashtype;
4320         params->miimon = miimon;
4321         params->num_peer_notif = num_peer_notif;
4322         params->arp_interval = arp_interval;
4323         params->arp_validate = arp_validate_value;
4324         params->arp_all_targets = arp_all_targets_value;
4325         params->updelay = updelay;
4326         params->downdelay = downdelay;
4327         params->use_carrier = use_carrier;
4328         params->lacp_fast = lacp_fast;
4329         params->primary[0] = 0;
4330         params->primary_reselect = primary_reselect_value;
4331         params->fail_over_mac = fail_over_mac_value;
4332         params->tx_queues = tx_queues;
4333         params->all_slaves_active = all_slaves_active;
4334         params->resend_igmp = resend_igmp;
4335         params->min_links = min_links;
4336         params->lp_interval = lp_interval;
4337         params->packets_per_slave = packets_per_slave;
4338         params->tlb_dynamic_lb = 1; /* Default value */
4339         if (packets_per_slave > 0) {
4340                 params->reciprocal_packets_per_slave =
4341                         reciprocal_value(packets_per_slave);
4342         } else {
4343                 /* reciprocal_packets_per_slave is unused if
4344                  * packets_per_slave is 0 or 1, just initialize it
4345                  */
4346                 params->reciprocal_packets_per_slave =
4347                         (struct reciprocal_value) { 0 };
4348         }
4349 
4350         if (primary) {
4351                 strncpy(params->primary, primary, IFNAMSIZ);
4352                 params->primary[IFNAMSIZ - 1] = 0;
4353         }
4354 
4355         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4356 
4357         return 0;
4358 }
4359 
4360 static struct lock_class_key bonding_netdev_xmit_lock_key;
4361 static struct lock_class_key bonding_netdev_addr_lock_key;
4362 static struct lock_class_key bonding_tx_busylock_key;
4363 
4364 static void bond_set_lockdep_class_one(struct net_device *dev,
4365                                        struct netdev_queue *txq,
4366                                        void *_unused)
4367 {
4368         lockdep_set_class(&txq->_xmit_lock,
4369                           &bonding_netdev_xmit_lock_key);
4370 }
4371 
4372 static void bond_set_lockdep_class(struct net_device *dev)
4373 {
4374         lockdep_set_class(&dev->addr_list_lock,
4375                           &bonding_netdev_addr_lock_key);
4376         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4377         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4378 }
4379 
4380 /*
4381  * Called from registration process
4382  */
4383 static int bond_init(struct net_device *bond_dev)
4384 {
4385         struct bonding *bond = netdev_priv(bond_dev);
4386         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4387         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4388 
4389         netdev_dbg(bond_dev, "Begin bond_init\n");
4390 
4391         /*
4392          * Initialize locks that may be required during
4393          * en/deslave operations.  All of the bond_open work
4394          * (of which this is part) should really be moved to
4395          * a phase prior to dev_open
4396          */
4397         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4398         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4399 
4400         bond->wq = create_singlethread_workqueue(bond_dev->name);
4401         if (!bond->wq)
4402                 return -ENOMEM;
4403 
4404         bond_set_lockdep_class(bond_dev);
4405 
4406         list_add_tail(&bond->bond_list, &bn->dev_list);
4407 
4408         bond_prepare_sysfs_group(bond);
4409 
4410         bond_debug_register(bond);
4411 
4412         /* Ensure valid dev_addr */
4413         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4414             bond_dev->addr_assign_type == NET_ADDR_PERM)
4415                 eth_hw_addr_random(bond_dev);
4416 
4417         return 0;
4418 }
4419 
4420 unsigned int bond_get_num_tx_queues(void)
4421 {
4422         return tx_queues;
4423 }
4424 
4425 /* Create a new bond based on the specified name and bonding parameters.
4426  * If name is NULL, obtain a suitable "bond%d" name for us.
4427  * Caller must NOT hold rtnl_lock; we need to release it here before we
4428  * set up our sysfs entries.
4429  */
4430 int bond_create(struct net *net, const char *name)
4431 {
4432         struct net_device *bond_dev;
4433         int res;
4434 
4435         rtnl_lock();
4436 
4437         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4438                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4439                                    bond_setup, tx_queues);
4440         if (!bond_dev) {
4441                 pr_err("%s: eek! can't alloc netdev!\n", name);
4442                 rtnl_unlock();
4443                 return -ENOMEM;
4444         }
4445 
4446         dev_net_set(bond_dev, net);
4447         bond_dev->rtnl_link_ops = &bond_link_ops;
4448 
4449         res = register_netdevice(bond_dev);
4450 
4451         netif_carrier_off(bond_dev);
4452 
4453         rtnl_unlock();
4454         if (res < 0)
4455                 bond_destructor(bond_dev);
4456         return res;
4457 }
4458 
4459 static int __net_init bond_net_init(struct net *net)
4460 {
4461         struct bond_net *bn = net_generic(net, bond_net_id);
4462 
4463         bn->net = net;
4464         INIT_LIST_HEAD(&bn->dev_list);
4465 
4466         bond_create_proc_dir(bn);
4467         bond_create_sysfs(bn);
4468 
4469         return 0;
4470 }
4471 
4472 static void __net_exit bond_net_exit(struct net *net)
4473 {
4474         struct bond_net *bn = net_generic(net, bond_net_id);
4475         struct bonding *bond, *tmp_bond;
4476         LIST_HEAD(list);
4477 
4478         bond_destroy_sysfs(bn);
4479 
4480         /* Kill off any bonds created after unregistering bond rtnl ops */
4481         rtnl_lock();
4482         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4483                 unregister_netdevice_queue(bond->dev, &list);
4484         unregister_netdevice_many(&list);
4485         rtnl_unlock();
4486 
4487         bond_destroy_proc_dir(bn);
4488 }
4489 
4490 static struct pernet_operations bond_net_ops = {
4491         .init = bond_net_init,
4492         .exit = bond_net_exit,
4493         .id   = &bond_net_id,
4494         .size = sizeof(struct bond_net),
4495 };
4496 
4497 static int __init bonding_init(void)
4498 {
4499         int i;
4500         int res;
4501 
4502         pr_info("%s", bond_version);
4503 
4504         res = bond_check_params(&bonding_defaults);
4505         if (res)
4506                 goto out;
4507 
4508         res = register_pernet_subsys(&bond_net_ops);
4509         if (res)
4510                 goto out;
4511 
4512         res = bond_netlink_init();
4513         if (res)
4514                 goto err_link;
4515 
4516         bond_create_debugfs();
4517 
4518         for (i = 0; i < max_bonds; i++) {
4519                 res = bond_create(&init_net, NULL);
4520                 if (res)
4521                         goto err;
4522         }
4523 
4524         register_netdevice_notifier(&bond_netdev_notifier);
4525 out:
4526         return res;
4527 err:
4528         bond_destroy_debugfs();
4529         bond_netlink_fini();
4530 err_link:
4531         unregister_pernet_subsys(&bond_net_ops);
4532         goto out;
4533 
4534 }
4535 
4536 static void __exit bonding_exit(void)
4537 {
4538         unregister_netdevice_notifier(&bond_netdev_notifier);
4539 
4540         bond_destroy_debugfs();
4541 
4542         bond_netlink_fini();
4543         unregister_pernet_subsys(&bond_net_ops);
4544 
4545 #ifdef CONFIG_NET_POLL_CONTROLLER
4546         /*
4547          * Make sure we don't have an imbalance on our netpoll blocking
4548          */
4549         WARN_ON(atomic_read(&netpoll_block_tx));
4550 #endif
4551 }
4552 
4553 module_init(bonding_init);
4554 module_exit(bonding_exit);
4555 MODULE_LICENSE("GPL");
4556 MODULE_VERSION(DRV_VERSION);
4557 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4558 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4559 

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