Version:  2.0.40 2.2.26 2.4.37 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 3.18

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 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
212                                                 struct rtnl_link_stats64 *stats);
213 static void bond_slave_arr_handler(struct work_struct *work);
214 
215 /*---------------------------- General routines -----------------------------*/
216 
217 const char *bond_mode_name(int mode)
218 {
219         static const char *names[] = {
220                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
221                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
222                 [BOND_MODE_XOR] = "load balancing (xor)",
223                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
224                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
225                 [BOND_MODE_TLB] = "transmit load balancing",
226                 [BOND_MODE_ALB] = "adaptive load balancing",
227         };
228 
229         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
230                 return "unknown";
231 
232         return names[mode];
233 }
234 
235 /*---------------------------------- VLAN -----------------------------------*/
236 
237 /**
238  * bond_dev_queue_xmit - Prepare skb for xmit.
239  *
240  * @bond: bond device that got this skb for tx.
241  * @skb: hw accel VLAN tagged skb to transmit
242  * @slave_dev: slave that is supposed to xmit this skbuff
243  */
244 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
245                         struct net_device *slave_dev)
246 {
247         skb->dev = slave_dev;
248 
249         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
250                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
251         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
252 
253         if (unlikely(netpoll_tx_running(bond->dev)))
254                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
255         else
256                 dev_queue_xmit(skb);
257 }
258 
259 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
260  * We don't protect the slave list iteration with a lock because:
261  * a. This operation is performed in IOCTL context,
262  * b. The operation is protected by the RTNL semaphore in the 8021q code,
263  * c. Holding a lock with BH disabled while directly calling a base driver
264  *    entry point is generally a BAD idea.
265  *
266  * The design of synchronization/protection for this operation in the 8021q
267  * module is good for one or more VLAN devices over a single physical device
268  * and cannot be extended for a teaming solution like bonding, so there is a
269  * potential race condition here where a net device from the vlan group might
270  * be referenced (either by a base driver or the 8021q code) while it is being
271  * removed from the system. However, it turns out we're not making matters
272  * worse, and if it works for regular VLAN usage it will work here too.
273 */
274 
275 /**
276  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
277  * @bond_dev: bonding net device that got called
278  * @vid: vlan id being added
279  */
280 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
281                                 __be16 proto, u16 vid)
282 {
283         struct bonding *bond = netdev_priv(bond_dev);
284         struct slave *slave, *rollback_slave;
285         struct list_head *iter;
286         int res;
287 
288         bond_for_each_slave(bond, slave, iter) {
289                 res = vlan_vid_add(slave->dev, proto, vid);
290                 if (res)
291                         goto unwind;
292         }
293 
294         return 0;
295 
296 unwind:
297         /* unwind to the slave that failed */
298         bond_for_each_slave(bond, rollback_slave, iter) {
299                 if (rollback_slave == slave)
300                         break;
301 
302                 vlan_vid_del(rollback_slave->dev, proto, vid);
303         }
304 
305         return res;
306 }
307 
308 /**
309  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
310  * @bond_dev: bonding net device that got called
311  * @vid: vlan id being removed
312  */
313 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
314                                  __be16 proto, u16 vid)
315 {
316         struct bonding *bond = netdev_priv(bond_dev);
317         struct list_head *iter;
318         struct slave *slave;
319 
320         bond_for_each_slave(bond, slave, iter)
321                 vlan_vid_del(slave->dev, proto, vid);
322 
323         if (bond_is_lb(bond))
324                 bond_alb_clear_vlan(bond, vid);
325 
326         return 0;
327 }
328 
329 /*------------------------------- Link status -------------------------------*/
330 
331 /* Set the carrier state for the master according to the state of its
332  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
333  * do special 802.3ad magic.
334  *
335  * Returns zero if carrier state does not change, nonzero if it does.
336  */
337 static int bond_set_carrier(struct bonding *bond)
338 {
339         struct list_head *iter;
340         struct slave *slave;
341 
342         if (!bond_has_slaves(bond))
343                 goto down;
344 
345         if (BOND_MODE(bond) == BOND_MODE_8023AD)
346                 return bond_3ad_set_carrier(bond);
347 
348         bond_for_each_slave(bond, slave, iter) {
349                 if (slave->link == BOND_LINK_UP) {
350                         if (!netif_carrier_ok(bond->dev)) {
351                                 netif_carrier_on(bond->dev);
352                                 return 1;
353                         }
354                         return 0;
355                 }
356         }
357 
358 down:
359         if (netif_carrier_ok(bond->dev)) {
360                 netif_carrier_off(bond->dev);
361                 return 1;
362         }
363         return 0;
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 /* if <dev> supports MII link status reporting, check its link status.
420  *
421  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
422  * depending upon the setting of the use_carrier parameter.
423  *
424  * Return either BMSR_LSTATUS, meaning that the link is up (or we
425  * can't tell and just pretend it is), or 0, meaning that the link is
426  * down.
427  *
428  * If reporting is non-zero, instead of faking link up, return -1 if
429  * both ETHTOOL and MII ioctls fail (meaning the device does not
430  * support them).  If use_carrier is set, return whatever it says.
431  * It'd be nice if there was a good way to tell if a driver supports
432  * netif_carrier, but there really isn't.
433  */
434 static int bond_check_dev_link(struct bonding *bond,
435                                struct net_device *slave_dev, int reporting)
436 {
437         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
438         int (*ioctl)(struct net_device *, struct ifreq *, int);
439         struct ifreq ifr;
440         struct mii_ioctl_data *mii;
441 
442         if (!reporting && !netif_running(slave_dev))
443                 return 0;
444 
445         if (bond->params.use_carrier)
446                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
447 
448         /* Try to get link status using Ethtool first. */
449         if (slave_dev->ethtool_ops->get_link)
450                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
451                         BMSR_LSTATUS : 0;
452 
453         /* Ethtool can't be used, fallback to MII ioctls. */
454         ioctl = slave_ops->ndo_do_ioctl;
455         if (ioctl) {
456                 /* TODO: set pointer to correct ioctl on a per team member
457                  *       bases to make this more efficient. that is, once
458                  *       we determine the correct ioctl, we will always
459                  *       call it and not the others for that team
460                  *       member.
461                  */
462 
463                 /* We cannot assume that SIOCGMIIPHY will also read a
464                  * register; not all network drivers (e.g., e100)
465                  * support that.
466                  */
467 
468                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
469                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
470                 mii = if_mii(&ifr);
471                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
472                         mii->reg_num = MII_BMSR;
473                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
474                                 return mii->val_out & BMSR_LSTATUS;
475                 }
476         }
477 
478         /* If reporting, report that either there's no dev->do_ioctl,
479          * or both SIOCGMIIREG and get_link failed (meaning that we
480          * cannot report link status).  If not reporting, pretend
481          * we're ok.
482          */
483         return reporting ? -1 : BMSR_LSTATUS;
484 }
485 
486 /*----------------------------- Multicast list ------------------------------*/
487 
488 /* Push the promiscuity flag down to appropriate slaves */
489 static int bond_set_promiscuity(struct bonding *bond, int inc)
490 {
491         struct list_head *iter;
492         int err = 0;
493 
494         if (bond_uses_primary(bond)) {
495                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
496 
497                 if (curr_active)
498                         err = dev_set_promiscuity(curr_active->dev, inc);
499         } else {
500                 struct slave *slave;
501 
502                 bond_for_each_slave(bond, slave, iter) {
503                         err = dev_set_promiscuity(slave->dev, inc);
504                         if (err)
505                                 return err;
506                 }
507         }
508         return err;
509 }
510 
511 /* Push the allmulti flag down to all slaves */
512 static int bond_set_allmulti(struct bonding *bond, int inc)
513 {
514         struct list_head *iter;
515         int err = 0;
516 
517         if (bond_uses_primary(bond)) {
518                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
519 
520                 if (curr_active)
521                         err = dev_set_allmulti(curr_active->dev, inc);
522         } else {
523                 struct slave *slave;
524 
525                 bond_for_each_slave(bond, slave, iter) {
526                         err = dev_set_allmulti(slave->dev, inc);
527                         if (err)
528                                 return err;
529                 }
530         }
531         return err;
532 }
533 
534 /* Retrieve the list of registered multicast addresses for the bonding
535  * device and retransmit an IGMP JOIN request to the current active
536  * slave.
537  */
538 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
539 {
540         struct bonding *bond = container_of(work, struct bonding,
541                                             mcast_work.work);
542 
543         if (!rtnl_trylock()) {
544                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
545                 return;
546         }
547         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
548 
549         if (bond->igmp_retrans > 1) {
550                 bond->igmp_retrans--;
551                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
552         }
553         rtnl_unlock();
554 }
555 
556 /* Flush bond's hardware addresses from slave */
557 static void bond_hw_addr_flush(struct net_device *bond_dev,
558                                struct net_device *slave_dev)
559 {
560         struct bonding *bond = netdev_priv(bond_dev);
561 
562         dev_uc_unsync(slave_dev, bond_dev);
563         dev_mc_unsync(slave_dev, bond_dev);
564 
565         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
566                 /* del lacpdu mc addr from mc list */
567                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
568 
569                 dev_mc_del(slave_dev, lacpdu_multicast);
570         }
571 }
572 
573 /*--------------------------- Active slave change ---------------------------*/
574 
575 /* Update the hardware address list and promisc/allmulti for the new and
576  * old active slaves (if any).  Modes that are not using primary keep all
577  * slaves up date at all times; only the modes that use primary need to call
578  * this function to swap these settings during a failover.
579  */
580 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
581                               struct slave *old_active)
582 {
583         if (old_active) {
584                 if (bond->dev->flags & IFF_PROMISC)
585                         dev_set_promiscuity(old_active->dev, -1);
586 
587                 if (bond->dev->flags & IFF_ALLMULTI)
588                         dev_set_allmulti(old_active->dev, -1);
589 
590                 bond_hw_addr_flush(bond->dev, old_active->dev);
591         }
592 
593         if (new_active) {
594                 /* FIXME: Signal errors upstream. */
595                 if (bond->dev->flags & IFF_PROMISC)
596                         dev_set_promiscuity(new_active->dev, 1);
597 
598                 if (bond->dev->flags & IFF_ALLMULTI)
599                         dev_set_allmulti(new_active->dev, 1);
600 
601                 netif_addr_lock_bh(bond->dev);
602                 dev_uc_sync(new_active->dev, bond->dev);
603                 dev_mc_sync(new_active->dev, bond->dev);
604                 netif_addr_unlock_bh(bond->dev);
605         }
606 }
607 
608 /**
609  * bond_set_dev_addr - clone slave's address to bond
610  * @bond_dev: bond net device
611  * @slave_dev: slave net device
612  *
613  * Should be called with RTNL held.
614  */
615 static void bond_set_dev_addr(struct net_device *bond_dev,
616                               struct net_device *slave_dev)
617 {
618         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
619                    bond_dev, slave_dev, slave_dev->addr_len);
620         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
621         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
622         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
623 }
624 
625 /* bond_do_fail_over_mac
626  *
627  * Perform special MAC address swapping for fail_over_mac settings
628  *
629  * Called with RTNL
630  */
631 static void bond_do_fail_over_mac(struct bonding *bond,
632                                   struct slave *new_active,
633                                   struct slave *old_active)
634 {
635         u8 tmp_mac[ETH_ALEN];
636         struct sockaddr saddr;
637         int rv;
638 
639         switch (bond->params.fail_over_mac) {
640         case BOND_FOM_ACTIVE:
641                 if (new_active)
642                         bond_set_dev_addr(bond->dev, new_active->dev);
643                 break;
644         case BOND_FOM_FOLLOW:
645                 /* if new_active && old_active, swap them
646                  * if just old_active, do nothing (going to no active slave)
647                  * if just new_active, set new_active to bond's MAC
648                  */
649                 if (!new_active)
650                         return;
651 
652                 if (old_active) {
653                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
654                         ether_addr_copy(saddr.sa_data,
655                                         old_active->dev->dev_addr);
656                         saddr.sa_family = new_active->dev->type;
657                 } else {
658                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
659                         saddr.sa_family = bond->dev->type;
660                 }
661 
662                 rv = dev_set_mac_address(new_active->dev, &saddr);
663                 if (rv) {
664                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
665                                    -rv, new_active->dev->name);
666                         goto out;
667                 }
668 
669                 if (!old_active)
670                         goto out;
671 
672                 ether_addr_copy(saddr.sa_data, tmp_mac);
673                 saddr.sa_family = old_active->dev->type;
674 
675                 rv = dev_set_mac_address(old_active->dev, &saddr);
676                 if (rv)
677                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
678                                    -rv, new_active->dev->name);
679 out:
680                 break;
681         default:
682                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
683                            bond->params.fail_over_mac);
684                 break;
685         }
686 
687 }
688 
689 static bool bond_should_change_active(struct bonding *bond)
690 {
691         struct slave *prim = rtnl_dereference(bond->primary_slave);
692         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
693 
694         if (!prim || !curr || curr->link != BOND_LINK_UP)
695                 return true;
696         if (bond->force_primary) {
697                 bond->force_primary = false;
698                 return true;
699         }
700         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
701             (prim->speed < curr->speed ||
702              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
703                 return false;
704         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
705                 return false;
706         return true;
707 }
708 
709 /**
710  * find_best_interface - select the best available slave to be the active one
711  * @bond: our bonding struct
712  */
713 static struct slave *bond_find_best_slave(struct bonding *bond)
714 {
715         struct slave *slave, *bestslave = NULL, *primary;
716         struct list_head *iter;
717         int mintime = bond->params.updelay;
718 
719         primary = rtnl_dereference(bond->primary_slave);
720         if (primary && primary->link == BOND_LINK_UP &&
721             bond_should_change_active(bond))
722                 return primary;
723 
724         bond_for_each_slave(bond, slave, iter) {
725                 if (slave->link == BOND_LINK_UP)
726                         return slave;
727                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
728                     slave->delay < mintime) {
729                         mintime = slave->delay;
730                         bestslave = slave;
731                 }
732         }
733 
734         return bestslave;
735 }
736 
737 static bool bond_should_notify_peers(struct bonding *bond)
738 {
739         struct slave *slave;
740 
741         rcu_read_lock();
742         slave = rcu_dereference(bond->curr_active_slave);
743         rcu_read_unlock();
744 
745         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
746                    slave ? slave->dev->name : "NULL");
747 
748         if (!slave || !bond->send_peer_notif ||
749             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
750                 return false;
751 
752         return true;
753 }
754 
755 /**
756  * change_active_interface - change the active slave into the specified one
757  * @bond: our bonding struct
758  * @new: the new slave to make the active one
759  *
760  * Set the new slave to the bond's settings and unset them on the old
761  * curr_active_slave.
762  * Setting include flags, mc-list, promiscuity, allmulti, etc.
763  *
764  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
765  * because it is apparently the best available slave we have, even though its
766  * updelay hasn't timed out yet.
767  *
768  * Caller must hold RTNL.
769  */
770 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
771 {
772         struct slave *old_active;
773 
774         ASSERT_RTNL();
775 
776         old_active = rtnl_dereference(bond->curr_active_slave);
777 
778         if (old_active == new_active)
779                 return;
780 
781         if (new_active) {
782                 new_active->last_link_up = jiffies;
783 
784                 if (new_active->link == BOND_LINK_BACK) {
785                         if (bond_uses_primary(bond)) {
786                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
787                                             new_active->dev->name,
788                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
789                         }
790 
791                         new_active->delay = 0;
792                         new_active->link = BOND_LINK_UP;
793 
794                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
795                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
796 
797                         if (bond_is_lb(bond))
798                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
799                 } else {
800                         if (bond_uses_primary(bond)) {
801                                 netdev_info(bond->dev, "making interface %s the new active one\n",
802                                             new_active->dev->name);
803                         }
804                 }
805         }
806 
807         if (bond_uses_primary(bond))
808                 bond_hw_addr_swap(bond, new_active, old_active);
809 
810         if (bond_is_lb(bond)) {
811                 bond_alb_handle_active_change(bond, new_active);
812                 if (old_active)
813                         bond_set_slave_inactive_flags(old_active,
814                                                       BOND_SLAVE_NOTIFY_NOW);
815                 if (new_active)
816                         bond_set_slave_active_flags(new_active,
817                                                     BOND_SLAVE_NOTIFY_NOW);
818         } else {
819                 rcu_assign_pointer(bond->curr_active_slave, new_active);
820         }
821 
822         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
823                 if (old_active)
824                         bond_set_slave_inactive_flags(old_active,
825                                                       BOND_SLAVE_NOTIFY_NOW);
826 
827                 if (new_active) {
828                         bool should_notify_peers = false;
829 
830                         bond_set_slave_active_flags(new_active,
831                                                     BOND_SLAVE_NOTIFY_NOW);
832 
833                         if (bond->params.fail_over_mac)
834                                 bond_do_fail_over_mac(bond, new_active,
835                                                       old_active);
836 
837                         if (netif_running(bond->dev)) {
838                                 bond->send_peer_notif =
839                                         bond->params.num_peer_notif;
840                                 should_notify_peers =
841                                         bond_should_notify_peers(bond);
842                         }
843 
844                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
845                         if (should_notify_peers)
846                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
847                                                          bond->dev);
848                 }
849         }
850 
851         /* resend IGMP joins since active slave has changed or
852          * all were sent on curr_active_slave.
853          * resend only if bond is brought up with the affected
854          * bonding modes and the retransmission is enabled
855          */
856         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
857             ((bond_uses_primary(bond) && new_active) ||
858              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
859                 bond->igmp_retrans = bond->params.resend_igmp;
860                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
861         }
862 }
863 
864 /**
865  * bond_select_active_slave - select a new active slave, if needed
866  * @bond: our bonding struct
867  *
868  * This functions should be called when one of the following occurs:
869  * - The old curr_active_slave has been released or lost its link.
870  * - The primary_slave has got its link back.
871  * - A slave has got its link back and there's no old curr_active_slave.
872  *
873  * Caller must hold RTNL.
874  */
875 void bond_select_active_slave(struct bonding *bond)
876 {
877         struct slave *best_slave;
878         int rv;
879 
880         ASSERT_RTNL();
881 
882         best_slave = bond_find_best_slave(bond);
883         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
884                 bond_change_active_slave(bond, best_slave);
885                 rv = bond_set_carrier(bond);
886                 if (!rv)
887                         return;
888 
889                 if (netif_carrier_ok(bond->dev)) {
890                         netdev_info(bond->dev, "first active interface up!\n");
891                 } else {
892                         netdev_info(bond->dev, "now running without any active interface!\n");
893                 }
894         }
895 }
896 
897 #ifdef CONFIG_NET_POLL_CONTROLLER
898 static inline int slave_enable_netpoll(struct slave *slave)
899 {
900         struct netpoll *np;
901         int err = 0;
902 
903         np = kzalloc(sizeof(*np), GFP_KERNEL);
904         err = -ENOMEM;
905         if (!np)
906                 goto out;
907 
908         err = __netpoll_setup(np, slave->dev);
909         if (err) {
910                 kfree(np);
911                 goto out;
912         }
913         slave->np = np;
914 out:
915         return err;
916 }
917 static inline void slave_disable_netpoll(struct slave *slave)
918 {
919         struct netpoll *np = slave->np;
920 
921         if (!np)
922                 return;
923 
924         slave->np = NULL;
925         __netpoll_free_async(np);
926 }
927 
928 static void bond_poll_controller(struct net_device *bond_dev)
929 {
930 }
931 
932 static void bond_netpoll_cleanup(struct net_device *bond_dev)
933 {
934         struct bonding *bond = netdev_priv(bond_dev);
935         struct list_head *iter;
936         struct slave *slave;
937 
938         bond_for_each_slave(bond, slave, iter)
939                 if (bond_slave_is_up(slave))
940                         slave_disable_netpoll(slave);
941 }
942 
943 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
944 {
945         struct bonding *bond = netdev_priv(dev);
946         struct list_head *iter;
947         struct slave *slave;
948         int err = 0;
949 
950         bond_for_each_slave(bond, slave, iter) {
951                 err = slave_enable_netpoll(slave);
952                 if (err) {
953                         bond_netpoll_cleanup(dev);
954                         break;
955                 }
956         }
957         return err;
958 }
959 #else
960 static inline int slave_enable_netpoll(struct slave *slave)
961 {
962         return 0;
963 }
964 static inline void slave_disable_netpoll(struct slave *slave)
965 {
966 }
967 static void bond_netpoll_cleanup(struct net_device *bond_dev)
968 {
969 }
970 #endif
971 
972 /*---------------------------------- IOCTL ----------------------------------*/
973 
974 static netdev_features_t bond_fix_features(struct net_device *dev,
975                                            netdev_features_t features)
976 {
977         struct bonding *bond = netdev_priv(dev);
978         struct list_head *iter;
979         netdev_features_t mask;
980         struct slave *slave;
981 
982         mask = features;
983         features &= ~NETIF_F_ONE_FOR_ALL;
984         features |= NETIF_F_ALL_FOR_ALL;
985 
986         bond_for_each_slave(bond, slave, iter) {
987                 features = netdev_increment_features(features,
988                                                      slave->dev->features,
989                                                      mask);
990         }
991         features = netdev_add_tso_features(features, mask);
992 
993         return features;
994 }
995 
996 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
997                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
998                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
999 
1000 #define BOND_ENC_FEATURES       (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1001                                  NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL)
1002 
1003 static void bond_compute_features(struct bonding *bond)
1004 {
1005         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1006                                         IFF_XMIT_DST_RELEASE_PERM;
1007         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1008         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1009         struct net_device *bond_dev = bond->dev;
1010         struct list_head *iter;
1011         struct slave *slave;
1012         unsigned short max_hard_header_len = ETH_HLEN;
1013         unsigned int gso_max_size = GSO_MAX_SIZE;
1014         u16 gso_max_segs = GSO_MAX_SEGS;
1015 
1016         if (!bond_has_slaves(bond))
1017                 goto done;
1018         vlan_features &= NETIF_F_ALL_FOR_ALL;
1019 
1020         bond_for_each_slave(bond, slave, iter) {
1021                 vlan_features = netdev_increment_features(vlan_features,
1022                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1023 
1024                 enc_features = netdev_increment_features(enc_features,
1025                                                          slave->dev->hw_enc_features,
1026                                                          BOND_ENC_FEATURES);
1027                 dst_release_flag &= slave->dev->priv_flags;
1028                 if (slave->dev->hard_header_len > max_hard_header_len)
1029                         max_hard_header_len = slave->dev->hard_header_len;
1030 
1031                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1032                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1033         }
1034 
1035 done:
1036         bond_dev->vlan_features = vlan_features;
1037         bond_dev->hw_enc_features = enc_features;
1038         bond_dev->hard_header_len = max_hard_header_len;
1039         bond_dev->gso_max_segs = gso_max_segs;
1040         netif_set_gso_max_size(bond_dev, gso_max_size);
1041 
1042         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1043         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1044             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1045                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1046 
1047         netdev_change_features(bond_dev);
1048 }
1049 
1050 static void bond_setup_by_slave(struct net_device *bond_dev,
1051                                 struct net_device *slave_dev)
1052 {
1053         bond_dev->header_ops        = slave_dev->header_ops;
1054 
1055         bond_dev->type              = slave_dev->type;
1056         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1057         bond_dev->addr_len          = slave_dev->addr_len;
1058 
1059         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1060                 slave_dev->addr_len);
1061 }
1062 
1063 /* On bonding slaves other than the currently active slave, suppress
1064  * duplicates except for alb non-mcast/bcast.
1065  */
1066 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1067                                             struct slave *slave,
1068                                             struct bonding *bond)
1069 {
1070         if (bond_is_slave_inactive(slave)) {
1071                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1072                     skb->pkt_type != PACKET_BROADCAST &&
1073                     skb->pkt_type != PACKET_MULTICAST)
1074                         return false;
1075                 return true;
1076         }
1077         return false;
1078 }
1079 
1080 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1081 {
1082         struct sk_buff *skb = *pskb;
1083         struct slave *slave;
1084         struct bonding *bond;
1085         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1086                           struct slave *);
1087         int ret = RX_HANDLER_ANOTHER;
1088 
1089         skb = skb_share_check(skb, GFP_ATOMIC);
1090         if (unlikely(!skb))
1091                 return RX_HANDLER_CONSUMED;
1092 
1093         *pskb = skb;
1094 
1095         slave = bond_slave_get_rcu(skb->dev);
1096         bond = slave->bond;
1097 
1098         recv_probe = ACCESS_ONCE(bond->recv_probe);
1099         if (recv_probe) {
1100                 ret = recv_probe(skb, bond, slave);
1101                 if (ret == RX_HANDLER_CONSUMED) {
1102                         consume_skb(skb);
1103                         return ret;
1104                 }
1105         }
1106 
1107         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1108                 return RX_HANDLER_EXACT;
1109         }
1110 
1111         skb->dev = bond->dev;
1112 
1113         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1114             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1115             skb->pkt_type == PACKET_HOST) {
1116 
1117                 if (unlikely(skb_cow_head(skb,
1118                                           skb->data - skb_mac_header(skb)))) {
1119                         kfree_skb(skb);
1120                         return RX_HANDLER_CONSUMED;
1121                 }
1122                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1123         }
1124 
1125         return ret;
1126 }
1127 
1128 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1129                                       struct net_device *slave_dev,
1130                                       struct slave *slave)
1131 {
1132         int err;
1133 
1134         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1135         if (err)
1136                 return err;
1137         slave_dev->flags |= IFF_SLAVE;
1138         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1139         return 0;
1140 }
1141 
1142 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1143                                   struct net_device *slave_dev)
1144 {
1145         netdev_upper_dev_unlink(slave_dev, bond_dev);
1146         slave_dev->flags &= ~IFF_SLAVE;
1147         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1148 }
1149 
1150 static struct slave *bond_alloc_slave(struct bonding *bond)
1151 {
1152         struct slave *slave = NULL;
1153 
1154         slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1155         if (!slave)
1156                 return NULL;
1157 
1158         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1159                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1160                                                GFP_KERNEL);
1161                 if (!SLAVE_AD_INFO(slave)) {
1162                         kfree(slave);
1163                         return NULL;
1164                 }
1165         }
1166         return slave;
1167 }
1168 
1169 static void bond_free_slave(struct slave *slave)
1170 {
1171         struct bonding *bond = bond_get_bond_by_slave(slave);
1172 
1173         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1174                 kfree(SLAVE_AD_INFO(slave));
1175 
1176         kfree(slave);
1177 }
1178 
1179 /* enslave device <slave> to bond device <master> */
1180 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1181 {
1182         struct bonding *bond = netdev_priv(bond_dev);
1183         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1184         struct slave *new_slave = NULL, *prev_slave;
1185         struct sockaddr addr;
1186         int link_reporting;
1187         int res = 0, i;
1188 
1189         if (!bond->params.use_carrier &&
1190             slave_dev->ethtool_ops->get_link == NULL &&
1191             slave_ops->ndo_do_ioctl == NULL) {
1192                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1193                             slave_dev->name);
1194         }
1195 
1196         /* already enslaved */
1197         if (slave_dev->flags & IFF_SLAVE) {
1198                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1199                 return -EBUSY;
1200         }
1201 
1202         if (bond_dev == slave_dev) {
1203                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1204                 return -EPERM;
1205         }
1206 
1207         /* vlan challenged mutual exclusion */
1208         /* no need to lock since we're protected by rtnl_lock */
1209         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1210                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1211                            slave_dev->name);
1212                 if (vlan_uses_dev(bond_dev)) {
1213                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1214                                    slave_dev->name, bond_dev->name);
1215                         return -EPERM;
1216                 } else {
1217                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1218                                     slave_dev->name, slave_dev->name,
1219                                     bond_dev->name);
1220                 }
1221         } else {
1222                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1223                            slave_dev->name);
1224         }
1225 
1226         /* Old ifenslave binaries are no longer supported.  These can
1227          * be identified with moderate accuracy by the state of the slave:
1228          * the current ifenslave will set the interface down prior to
1229          * enslaving it; the old ifenslave will not.
1230          */
1231         if ((slave_dev->flags & IFF_UP)) {
1232                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1233                            slave_dev->name);
1234                 res = -EPERM;
1235                 goto err_undo_flags;
1236         }
1237 
1238         /* set bonding device ether type by slave - bonding netdevices are
1239          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1240          * there is a need to override some of the type dependent attribs/funcs.
1241          *
1242          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1243          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1244          */
1245         if (!bond_has_slaves(bond)) {
1246                 if (bond_dev->type != slave_dev->type) {
1247                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1248                                    bond_dev->type, slave_dev->type);
1249 
1250                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1251                                                        bond_dev);
1252                         res = notifier_to_errno(res);
1253                         if (res) {
1254                                 netdev_err(bond_dev, "refused to change device type\n");
1255                                 res = -EBUSY;
1256                                 goto err_undo_flags;
1257                         }
1258 
1259                         /* Flush unicast and multicast addresses */
1260                         dev_uc_flush(bond_dev);
1261                         dev_mc_flush(bond_dev);
1262 
1263                         if (slave_dev->type != ARPHRD_ETHER)
1264                                 bond_setup_by_slave(bond_dev, slave_dev);
1265                         else {
1266                                 ether_setup(bond_dev);
1267                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1268                         }
1269 
1270                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1271                                                  bond_dev);
1272                 }
1273         } else if (bond_dev->type != slave_dev->type) {
1274                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1275                            slave_dev->name, slave_dev->type, bond_dev->type);
1276                 res = -EINVAL;
1277                 goto err_undo_flags;
1278         }
1279 
1280         if (slave_ops->ndo_set_mac_address == NULL) {
1281                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1282                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1283                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1284                         if (!bond_has_slaves(bond)) {
1285                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1286                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1287                         } else {
1288                                 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");
1289                                 res = -EOPNOTSUPP;
1290                                 goto err_undo_flags;
1291                         }
1292                 }
1293         }
1294 
1295         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1296 
1297         /* If this is the first slave, then we need to set the master's hardware
1298          * address to be the same as the slave's.
1299          */
1300         if (!bond_has_slaves(bond) &&
1301             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1302                 bond_set_dev_addr(bond->dev, slave_dev);
1303 
1304         new_slave = bond_alloc_slave(bond);
1305         if (!new_slave) {
1306                 res = -ENOMEM;
1307                 goto err_undo_flags;
1308         }
1309 
1310         new_slave->bond = bond;
1311         new_slave->dev = slave_dev;
1312         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1313          * is set via sysfs or module option if desired.
1314          */
1315         new_slave->queue_id = 0;
1316 
1317         /* Save slave's original mtu and then set it to match the bond */
1318         new_slave->original_mtu = slave_dev->mtu;
1319         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1320         if (res) {
1321                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1322                 goto err_free;
1323         }
1324 
1325         /* Save slave's original ("permanent") mac address for modes
1326          * that need it, and for restoring it upon release, and then
1327          * set it to the master's address
1328          */
1329         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1330 
1331         if (!bond->params.fail_over_mac ||
1332             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1333                 /* Set slave to master's mac address.  The application already
1334                  * set the master's mac address to that of the first slave
1335                  */
1336                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1337                 addr.sa_family = slave_dev->type;
1338                 res = dev_set_mac_address(slave_dev, &addr);
1339                 if (res) {
1340                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1341                         goto err_restore_mtu;
1342                 }
1343         }
1344 
1345         /* open the slave since the application closed it */
1346         res = dev_open(slave_dev);
1347         if (res) {
1348                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1349                 goto err_restore_mac;
1350         }
1351 
1352         slave_dev->priv_flags |= IFF_BONDING;
1353         /* initialize slave stats */
1354         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1355 
1356         if (bond_is_lb(bond)) {
1357                 /* bond_alb_init_slave() must be called before all other stages since
1358                  * it might fail and we do not want to have to undo everything
1359                  */
1360                 res = bond_alb_init_slave(bond, new_slave);
1361                 if (res)
1362                         goto err_close;
1363         }
1364 
1365         /* If the mode uses primary, then the following is handled by
1366          * bond_change_active_slave().
1367          */
1368         if (!bond_uses_primary(bond)) {
1369                 /* set promiscuity level to new slave */
1370                 if (bond_dev->flags & IFF_PROMISC) {
1371                         res = dev_set_promiscuity(slave_dev, 1);
1372                         if (res)
1373                                 goto err_close;
1374                 }
1375 
1376                 /* set allmulti level to new slave */
1377                 if (bond_dev->flags & IFF_ALLMULTI) {
1378                         res = dev_set_allmulti(slave_dev, 1);
1379                         if (res)
1380                                 goto err_close;
1381                 }
1382 
1383                 netif_addr_lock_bh(bond_dev);
1384 
1385                 dev_mc_sync_multiple(slave_dev, bond_dev);
1386                 dev_uc_sync_multiple(slave_dev, bond_dev);
1387 
1388                 netif_addr_unlock_bh(bond_dev);
1389         }
1390 
1391         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1392                 /* add lacpdu mc addr to mc list */
1393                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1394 
1395                 dev_mc_add(slave_dev, lacpdu_multicast);
1396         }
1397 
1398         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1399         if (res) {
1400                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1401                            slave_dev->name);
1402                 goto err_close;
1403         }
1404 
1405         prev_slave = bond_last_slave(bond);
1406 
1407         new_slave->delay = 0;
1408         new_slave->link_failure_count = 0;
1409 
1410         bond_update_speed_duplex(new_slave);
1411 
1412         new_slave->last_rx = jiffies -
1413                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1414         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1415                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1416 
1417         if (bond->params.miimon && !bond->params.use_carrier) {
1418                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1419 
1420                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1421                         /* miimon is set but a bonded network driver
1422                          * does not support ETHTOOL/MII and
1423                          * arp_interval is not set.  Note: if
1424                          * use_carrier is enabled, we will never go
1425                          * here (because netif_carrier is always
1426                          * supported); thus, we don't need to change
1427                          * the messages for netif_carrier.
1428                          */
1429                         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",
1430                                     slave_dev->name);
1431                 } else if (link_reporting == -1) {
1432                         /* unable get link status using mii/ethtool */
1433                         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",
1434                                     slave_dev->name);
1435                 }
1436         }
1437 
1438         /* check for initial state */
1439         if (bond->params.miimon) {
1440                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1441                         if (bond->params.updelay) {
1442                                 new_slave->link = BOND_LINK_BACK;
1443                                 new_slave->delay = bond->params.updelay;
1444                         } else {
1445                                 new_slave->link = BOND_LINK_UP;
1446                         }
1447                 } else {
1448                         new_slave->link = BOND_LINK_DOWN;
1449                 }
1450         } else if (bond->params.arp_interval) {
1451                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1452                         BOND_LINK_UP : BOND_LINK_DOWN);
1453         } else {
1454                 new_slave->link = BOND_LINK_UP;
1455         }
1456 
1457         if (new_slave->link != BOND_LINK_DOWN)
1458                 new_slave->last_link_up = jiffies;
1459         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1460                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1461                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1462 
1463         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1464                 /* if there is a primary slave, remember it */
1465                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1466                         rcu_assign_pointer(bond->primary_slave, new_slave);
1467                         bond->force_primary = true;
1468                 }
1469         }
1470 
1471         switch (BOND_MODE(bond)) {
1472         case BOND_MODE_ACTIVEBACKUP:
1473                 bond_set_slave_inactive_flags(new_slave,
1474                                               BOND_SLAVE_NOTIFY_NOW);
1475                 break;
1476         case BOND_MODE_8023AD:
1477                 /* in 802.3ad mode, the internal mechanism
1478                  * will activate the slaves in the selected
1479                  * aggregator
1480                  */
1481                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1482                 /* if this is the first slave */
1483                 if (!prev_slave) {
1484                         SLAVE_AD_INFO(new_slave)->id = 1;
1485                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1486                          * can be called only after the mac address of the bond is set
1487                          */
1488                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1489                 } else {
1490                         SLAVE_AD_INFO(new_slave)->id =
1491                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1492                 }
1493 
1494                 bond_3ad_bind_slave(new_slave);
1495                 break;
1496         case BOND_MODE_TLB:
1497         case BOND_MODE_ALB:
1498                 bond_set_active_slave(new_slave);
1499                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1500                 break;
1501         default:
1502                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1503 
1504                 /* always active in trunk mode */
1505                 bond_set_active_slave(new_slave);
1506 
1507                 /* In trunking mode there is little meaning to curr_active_slave
1508                  * anyway (it holds no special properties of the bond device),
1509                  * so we can change it without calling change_active_interface()
1510                  */
1511                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1512                     new_slave->link == BOND_LINK_UP)
1513                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1514 
1515                 break;
1516         } /* switch(bond_mode) */
1517 
1518 #ifdef CONFIG_NET_POLL_CONTROLLER
1519         slave_dev->npinfo = bond->dev->npinfo;
1520         if (slave_dev->npinfo) {
1521                 if (slave_enable_netpoll(new_slave)) {
1522                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1523                         res = -EBUSY;
1524                         goto err_detach;
1525                 }
1526         }
1527 #endif
1528 
1529         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1530                                          new_slave);
1531         if (res) {
1532                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1533                 goto err_detach;
1534         }
1535 
1536         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1537         if (res) {
1538                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1539                 goto err_unregister;
1540         }
1541 
1542         res = bond_sysfs_slave_add(new_slave);
1543         if (res) {
1544                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1545                 goto err_upper_unlink;
1546         }
1547 
1548         bond->slave_cnt++;
1549         bond_compute_features(bond);
1550         bond_set_carrier(bond);
1551 
1552         if (bond_uses_primary(bond)) {
1553                 block_netpoll_tx();
1554                 bond_select_active_slave(bond);
1555                 unblock_netpoll_tx();
1556         }
1557 
1558         if (bond_mode_uses_xmit_hash(bond))
1559                 bond_update_slave_arr(bond, NULL);
1560 
1561         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1562                     slave_dev->name,
1563                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1564                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1565 
1566         /* enslave is successful */
1567         return 0;
1568 
1569 /* Undo stages on error */
1570 err_upper_unlink:
1571         bond_upper_dev_unlink(bond_dev, slave_dev);
1572 
1573 err_unregister:
1574         netdev_rx_handler_unregister(slave_dev);
1575 
1576 err_detach:
1577         if (!bond_uses_primary(bond))
1578                 bond_hw_addr_flush(bond_dev, slave_dev);
1579 
1580         vlan_vids_del_by_dev(slave_dev, bond_dev);
1581         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1582                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1583         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1584                 block_netpoll_tx();
1585                 bond_change_active_slave(bond, NULL);
1586                 bond_select_active_slave(bond);
1587                 unblock_netpoll_tx();
1588         }
1589         /* either primary_slave or curr_active_slave might've changed */
1590         synchronize_rcu();
1591         slave_disable_netpoll(new_slave);
1592 
1593 err_close:
1594         slave_dev->priv_flags &= ~IFF_BONDING;
1595         dev_close(slave_dev);
1596 
1597 err_restore_mac:
1598         if (!bond->params.fail_over_mac ||
1599             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1600                 /* XXX TODO - fom follow mode needs to change master's
1601                  * MAC if this slave's MAC is in use by the bond, or at
1602                  * least print a warning.
1603                  */
1604                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1605                 addr.sa_family = slave_dev->type;
1606                 dev_set_mac_address(slave_dev, &addr);
1607         }
1608 
1609 err_restore_mtu:
1610         dev_set_mtu(slave_dev, new_slave->original_mtu);
1611 
1612 err_free:
1613         bond_free_slave(new_slave);
1614 
1615 err_undo_flags:
1616         /* Enslave of first slave has failed and we need to fix master's mac */
1617         if (!bond_has_slaves(bond) &&
1618             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1619                 eth_hw_addr_random(bond_dev);
1620 
1621         return res;
1622 }
1623 
1624 /* Try to release the slave device <slave> from the bond device <master>
1625  * It is legal to access curr_active_slave without a lock because all the function
1626  * is RTNL-locked. If "all" is true it means that the function is being called
1627  * while destroying a bond interface and all slaves are being released.
1628  *
1629  * The rules for slave state should be:
1630  *   for Active/Backup:
1631  *     Active stays on all backups go down
1632  *   for Bonded connections:
1633  *     The first up interface should be left on and all others downed.
1634  */
1635 static int __bond_release_one(struct net_device *bond_dev,
1636                               struct net_device *slave_dev,
1637                               bool all)
1638 {
1639         struct bonding *bond = netdev_priv(bond_dev);
1640         struct slave *slave, *oldcurrent;
1641         struct sockaddr addr;
1642         int old_flags = bond_dev->flags;
1643         netdev_features_t old_features = bond_dev->features;
1644 
1645         /* slave is not a slave or master is not master of this slave */
1646         if (!(slave_dev->flags & IFF_SLAVE) ||
1647             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1648                 netdev_err(bond_dev, "cannot release %s\n",
1649                            slave_dev->name);
1650                 return -EINVAL;
1651         }
1652 
1653         block_netpoll_tx();
1654 
1655         slave = bond_get_slave_by_dev(bond, slave_dev);
1656         if (!slave) {
1657                 /* not a slave of this bond */
1658                 netdev_info(bond_dev, "%s not enslaved\n",
1659                             slave_dev->name);
1660                 unblock_netpoll_tx();
1661                 return -EINVAL;
1662         }
1663 
1664         bond_sysfs_slave_del(slave);
1665 
1666         /* recompute stats just before removing the slave */
1667         bond_get_stats(bond->dev, &bond->bond_stats);
1668 
1669         bond_upper_dev_unlink(bond_dev, slave_dev);
1670         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1671          * for this slave anymore.
1672          */
1673         netdev_rx_handler_unregister(slave_dev);
1674 
1675         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1676                 bond_3ad_unbind_slave(slave);
1677 
1678         if (bond_mode_uses_xmit_hash(bond))
1679                 bond_update_slave_arr(bond, slave);
1680 
1681         netdev_info(bond_dev, "Releasing %s interface %s\n",
1682                     bond_is_active_slave(slave) ? "active" : "backup",
1683                     slave_dev->name);
1684 
1685         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1686 
1687         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1688 
1689         if (!all && (!bond->params.fail_over_mac ||
1690                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1691                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1692                     bond_has_slaves(bond))
1693                         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",
1694                                     slave_dev->name, slave->perm_hwaddr,
1695                                     bond_dev->name, slave_dev->name);
1696         }
1697 
1698         if (rtnl_dereference(bond->primary_slave) == slave)
1699                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1700 
1701         if (oldcurrent == slave)
1702                 bond_change_active_slave(bond, NULL);
1703 
1704         if (bond_is_lb(bond)) {
1705                 /* Must be called only after the slave has been
1706                  * detached from the list and the curr_active_slave
1707                  * has been cleared (if our_slave == old_current),
1708                  * but before a new active slave is selected.
1709                  */
1710                 bond_alb_deinit_slave(bond, slave);
1711         }
1712 
1713         if (all) {
1714                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1715         } else if (oldcurrent == slave) {
1716                 /* Note that we hold RTNL over this sequence, so there
1717                  * is no concern that another slave add/remove event
1718                  * will interfere.
1719                  */
1720                 bond_select_active_slave(bond);
1721         }
1722 
1723         if (!bond_has_slaves(bond)) {
1724                 bond_set_carrier(bond);
1725                 eth_hw_addr_random(bond_dev);
1726         }
1727 
1728         unblock_netpoll_tx();
1729         synchronize_rcu();
1730         bond->slave_cnt--;
1731 
1732         if (!bond_has_slaves(bond)) {
1733                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1734                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1735         }
1736 
1737         bond_compute_features(bond);
1738         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1739             (old_features & NETIF_F_VLAN_CHALLENGED))
1740                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1741                             slave_dev->name, bond_dev->name);
1742 
1743         vlan_vids_del_by_dev(slave_dev, bond_dev);
1744 
1745         /* If the mode uses primary, then this case was handled above by
1746          * bond_change_active_slave(..., NULL)
1747          */
1748         if (!bond_uses_primary(bond)) {
1749                 /* unset promiscuity level from slave
1750                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1751                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1752                  * value of that flag before that change, as that was the value
1753                  * when this slave was attached, so we cache at the start of the
1754                  * function and use it here. Same goes for ALLMULTI below
1755                  */
1756                 if (old_flags & IFF_PROMISC)
1757                         dev_set_promiscuity(slave_dev, -1);
1758 
1759                 /* unset allmulti level from slave */
1760                 if (old_flags & IFF_ALLMULTI)
1761                         dev_set_allmulti(slave_dev, -1);
1762 
1763                 bond_hw_addr_flush(bond_dev, slave_dev);
1764         }
1765 
1766         slave_disable_netpoll(slave);
1767 
1768         /* close slave before restoring its mac address */
1769         dev_close(slave_dev);
1770 
1771         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1772             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1773                 /* restore original ("permanent") mac address */
1774                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1775                 addr.sa_family = slave_dev->type;
1776                 dev_set_mac_address(slave_dev, &addr);
1777         }
1778 
1779         dev_set_mtu(slave_dev, slave->original_mtu);
1780 
1781         slave_dev->priv_flags &= ~IFF_BONDING;
1782 
1783         bond_free_slave(slave);
1784 
1785         return 0;
1786 }
1787 
1788 /* A wrapper used because of ndo_del_link */
1789 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1790 {
1791         return __bond_release_one(bond_dev, slave_dev, false);
1792 }
1793 
1794 /* First release a slave and then destroy the bond if no more slaves are left.
1795  * Must be under rtnl_lock when this function is called.
1796  */
1797 static int  bond_release_and_destroy(struct net_device *bond_dev,
1798                                      struct net_device *slave_dev)
1799 {
1800         struct bonding *bond = netdev_priv(bond_dev);
1801         int ret;
1802 
1803         ret = bond_release(bond_dev, slave_dev);
1804         if (ret == 0 && !bond_has_slaves(bond)) {
1805                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1806                 netdev_info(bond_dev, "Destroying bond %s\n",
1807                             bond_dev->name);
1808                 unregister_netdevice(bond_dev);
1809         }
1810         return ret;
1811 }
1812 
1813 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1814 {
1815         struct bonding *bond = netdev_priv(bond_dev);
1816 
1817         info->bond_mode = BOND_MODE(bond);
1818         info->miimon = bond->params.miimon;
1819         info->num_slaves = bond->slave_cnt;
1820 
1821         return 0;
1822 }
1823 
1824 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1825 {
1826         struct bonding *bond = netdev_priv(bond_dev);
1827         struct list_head *iter;
1828         int i = 0, res = -ENODEV;
1829         struct slave *slave;
1830 
1831         bond_for_each_slave(bond, slave, iter) {
1832                 if (i++ == (int)info->slave_id) {
1833                         res = 0;
1834                         strcpy(info->slave_name, slave->dev->name);
1835                         info->link = slave->link;
1836                         info->state = bond_slave_state(slave);
1837                         info->link_failure_count = slave->link_failure_count;
1838                         break;
1839                 }
1840         }
1841 
1842         return res;
1843 }
1844 
1845 /*-------------------------------- Monitoring -------------------------------*/
1846 
1847 /* called with rcu_read_lock() */
1848 static int bond_miimon_inspect(struct bonding *bond)
1849 {
1850         int link_state, commit = 0;
1851         struct list_head *iter;
1852         struct slave *slave;
1853         bool ignore_updelay;
1854 
1855         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1856 
1857         bond_for_each_slave_rcu(bond, slave, iter) {
1858                 slave->new_link = BOND_LINK_NOCHANGE;
1859 
1860                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1861 
1862                 switch (slave->link) {
1863                 case BOND_LINK_UP:
1864                         if (link_state)
1865                                 continue;
1866 
1867                         slave->link = BOND_LINK_FAIL;
1868                         slave->delay = bond->params.downdelay;
1869                         if (slave->delay) {
1870                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1871                                             (BOND_MODE(bond) ==
1872                                              BOND_MODE_ACTIVEBACKUP) ?
1873                                              (bond_is_active_slave(slave) ?
1874                                               "active " : "backup ") : "",
1875                                             slave->dev->name,
1876                                             bond->params.downdelay * bond->params.miimon);
1877                         }
1878                         /*FALLTHRU*/
1879                 case BOND_LINK_FAIL:
1880                         if (link_state) {
1881                                 /* recovered before downdelay expired */
1882                                 slave->link = BOND_LINK_UP;
1883                                 slave->last_link_up = jiffies;
1884                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1885                                             (bond->params.downdelay - slave->delay) *
1886                                             bond->params.miimon,
1887                                             slave->dev->name);
1888                                 continue;
1889                         }
1890 
1891                         if (slave->delay <= 0) {
1892                                 slave->new_link = BOND_LINK_DOWN;
1893                                 commit++;
1894                                 continue;
1895                         }
1896 
1897                         slave->delay--;
1898                         break;
1899 
1900                 case BOND_LINK_DOWN:
1901                         if (!link_state)
1902                                 continue;
1903 
1904                         slave->link = BOND_LINK_BACK;
1905                         slave->delay = bond->params.updelay;
1906 
1907                         if (slave->delay) {
1908                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1909                                             slave->dev->name,
1910                                             ignore_updelay ? 0 :
1911                                             bond->params.updelay *
1912                                             bond->params.miimon);
1913                         }
1914                         /*FALLTHRU*/
1915                 case BOND_LINK_BACK:
1916                         if (!link_state) {
1917                                 slave->link = BOND_LINK_DOWN;
1918                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
1919                                             (bond->params.updelay - slave->delay) *
1920                                             bond->params.miimon,
1921                                             slave->dev->name);
1922 
1923                                 continue;
1924                         }
1925 
1926                         if (ignore_updelay)
1927                                 slave->delay = 0;
1928 
1929                         if (slave->delay <= 0) {
1930                                 slave->new_link = BOND_LINK_UP;
1931                                 commit++;
1932                                 ignore_updelay = false;
1933                                 continue;
1934                         }
1935 
1936                         slave->delay--;
1937                         break;
1938                 }
1939         }
1940 
1941         return commit;
1942 }
1943 
1944 static void bond_miimon_commit(struct bonding *bond)
1945 {
1946         struct list_head *iter;
1947         struct slave *slave, *primary;
1948 
1949         bond_for_each_slave(bond, slave, iter) {
1950                 switch (slave->new_link) {
1951                 case BOND_LINK_NOCHANGE:
1952                         continue;
1953 
1954                 case BOND_LINK_UP:
1955                         slave->link = BOND_LINK_UP;
1956                         slave->last_link_up = jiffies;
1957 
1958                         primary = rtnl_dereference(bond->primary_slave);
1959                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1960                                 /* prevent it from being the active one */
1961                                 bond_set_backup_slave(slave);
1962                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1963                                 /* make it immediately active */
1964                                 bond_set_active_slave(slave);
1965                         } else if (slave != primary) {
1966                                 /* prevent it from being the active one */
1967                                 bond_set_backup_slave(slave);
1968                         }
1969 
1970                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
1971                                     slave->dev->name,
1972                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
1973                                     slave->duplex ? "full" : "half");
1974 
1975                         /* notify ad that the link status has changed */
1976                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1977                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
1978 
1979                         if (bond_is_lb(bond))
1980                                 bond_alb_handle_link_change(bond, slave,
1981                                                             BOND_LINK_UP);
1982 
1983                         if (BOND_MODE(bond) == BOND_MODE_XOR)
1984                                 bond_update_slave_arr(bond, NULL);
1985 
1986                         if (!bond->curr_active_slave || slave == primary)
1987                                 goto do_failover;
1988 
1989                         continue;
1990 
1991                 case BOND_LINK_DOWN:
1992                         if (slave->link_failure_count < UINT_MAX)
1993                                 slave->link_failure_count++;
1994 
1995                         slave->link = BOND_LINK_DOWN;
1996 
1997                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
1998                             BOND_MODE(bond) == BOND_MODE_8023AD)
1999                                 bond_set_slave_inactive_flags(slave,
2000                                                               BOND_SLAVE_NOTIFY_NOW);
2001 
2002                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2003                                     slave->dev->name);
2004 
2005                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2006                                 bond_3ad_handle_link_change(slave,
2007                                                             BOND_LINK_DOWN);
2008 
2009                         if (bond_is_lb(bond))
2010                                 bond_alb_handle_link_change(bond, slave,
2011                                                             BOND_LINK_DOWN);
2012 
2013                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2014                                 bond_update_slave_arr(bond, NULL);
2015 
2016                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2017                                 goto do_failover;
2018 
2019                         continue;
2020 
2021                 default:
2022                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2023                                    slave->new_link, slave->dev->name);
2024                         slave->new_link = BOND_LINK_NOCHANGE;
2025 
2026                         continue;
2027                 }
2028 
2029 do_failover:
2030                 block_netpoll_tx();
2031                 bond_select_active_slave(bond);
2032                 unblock_netpoll_tx();
2033         }
2034 
2035         bond_set_carrier(bond);
2036 }
2037 
2038 /* bond_mii_monitor
2039  *
2040  * Really a wrapper that splits the mii monitor into two phases: an
2041  * inspection, then (if inspection indicates something needs to be done)
2042  * an acquisition of appropriate locks followed by a commit phase to
2043  * implement whatever link state changes are indicated.
2044  */
2045 static void bond_mii_monitor(struct work_struct *work)
2046 {
2047         struct bonding *bond = container_of(work, struct bonding,
2048                                             mii_work.work);
2049         bool should_notify_peers = false;
2050         unsigned long delay;
2051 
2052         delay = msecs_to_jiffies(bond->params.miimon);
2053 
2054         if (!bond_has_slaves(bond))
2055                 goto re_arm;
2056 
2057         rcu_read_lock();
2058 
2059         should_notify_peers = bond_should_notify_peers(bond);
2060 
2061         if (bond_miimon_inspect(bond)) {
2062                 rcu_read_unlock();
2063 
2064                 /* Race avoidance with bond_close cancel of workqueue */
2065                 if (!rtnl_trylock()) {
2066                         delay = 1;
2067                         should_notify_peers = false;
2068                         goto re_arm;
2069                 }
2070 
2071                 bond_miimon_commit(bond);
2072 
2073                 rtnl_unlock();  /* might sleep, hold no other locks */
2074         } else
2075                 rcu_read_unlock();
2076 
2077 re_arm:
2078         if (bond->params.miimon)
2079                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2080 
2081         if (should_notify_peers) {
2082                 if (!rtnl_trylock())
2083                         return;
2084                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2085                 rtnl_unlock();
2086         }
2087 }
2088 
2089 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2090 {
2091         struct net_device *upper;
2092         struct list_head *iter;
2093         bool ret = false;
2094 
2095         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2096                 return true;
2097 
2098         rcu_read_lock();
2099         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2100                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2101                         ret = true;
2102                         break;
2103                 }
2104         }
2105         rcu_read_unlock();
2106 
2107         return ret;
2108 }
2109 
2110 /* We go to the (large) trouble of VLAN tagging ARP frames because
2111  * switches in VLAN mode (especially if ports are configured as
2112  * "native" to a VLAN) might not pass non-tagged frames.
2113  */
2114 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2115                           __be32 dest_ip, __be32 src_ip,
2116                           struct bond_vlan_tag *tags)
2117 {
2118         struct sk_buff *skb;
2119         struct bond_vlan_tag *outer_tag = tags;
2120 
2121         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2122                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2123 
2124         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2125                          NULL, slave_dev->dev_addr, NULL);
2126 
2127         if (!skb) {
2128                 net_err_ratelimited("ARP packet allocation failed\n");
2129                 return;
2130         }
2131 
2132         if (!tags || tags->vlan_proto == VLAN_N_VID)
2133                 goto xmit;
2134 
2135         tags++;
2136 
2137         /* Go through all the tags backwards and add them to the packet */
2138         while (tags->vlan_proto != VLAN_N_VID) {
2139                 if (!tags->vlan_id) {
2140                         tags++;
2141                         continue;
2142                 }
2143 
2144                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2145                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2146                 skb = __vlan_put_tag(skb, tags->vlan_proto,
2147                                      tags->vlan_id);
2148                 if (!skb) {
2149                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2150                         return;
2151                 }
2152 
2153                 tags++;
2154         }
2155         /* Set the outer tag */
2156         if (outer_tag->vlan_id) {
2157                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2158                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2159                 skb = vlan_put_tag(skb, outer_tag->vlan_proto,
2160                                    outer_tag->vlan_id);
2161                 if (!skb) {
2162                         net_err_ratelimited("failed to insert outer VLAN tag\n");
2163                         return;
2164                 }
2165         }
2166 
2167 xmit:
2168         arp_xmit(skb);
2169 }
2170 
2171 /* Validate the device path between the @start_dev and the @end_dev.
2172  * The path is valid if the @end_dev is reachable through device
2173  * stacking.
2174  * When the path is validated, collect any vlan information in the
2175  * path.
2176  */
2177 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2178                                               struct net_device *end_dev,
2179                                               int level)
2180 {
2181         struct bond_vlan_tag *tags;
2182         struct net_device *upper;
2183         struct list_head  *iter;
2184 
2185         if (start_dev == end_dev) {
2186                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2187                 if (!tags)
2188                         return ERR_PTR(-ENOMEM);
2189                 tags[level].vlan_proto = VLAN_N_VID;
2190                 return tags;
2191         }
2192 
2193         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2194                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2195                 if (IS_ERR_OR_NULL(tags)) {
2196                         if (IS_ERR(tags))
2197                                 return tags;
2198                         continue;
2199                 }
2200                 if (is_vlan_dev(upper)) {
2201                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2202                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2203                 }
2204 
2205                 return tags;
2206         }
2207 
2208         return NULL;
2209 }
2210 
2211 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2212 {
2213         struct rtable *rt;
2214         struct bond_vlan_tag *tags;
2215         __be32 *targets = bond->params.arp_targets, addr;
2216         int i;
2217 
2218         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2219                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2220                 tags = NULL;
2221 
2222                 /* Find out through which dev should the packet go */
2223                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2224                                      RTO_ONLINK, 0);
2225                 if (IS_ERR(rt)) {
2226                         /* there's no route to target - try to send arp
2227                          * probe to generate any traffic (arp_validate=0)
2228                          */
2229                         if (bond->params.arp_validate)
2230                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2231                                                      bond->dev->name,
2232                                                      &targets[i]);
2233                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2234                                       0, tags);
2235                         continue;
2236                 }
2237 
2238                 /* bond device itself */
2239                 if (rt->dst.dev == bond->dev)
2240                         goto found;
2241 
2242                 rcu_read_lock();
2243                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2244                 rcu_read_unlock();
2245 
2246                 if (!IS_ERR_OR_NULL(tags))
2247                         goto found;
2248 
2249                 /* Not our device - skip */
2250                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2251                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2252 
2253                 ip_rt_put(rt);
2254                 continue;
2255 
2256 found:
2257                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2258                 ip_rt_put(rt);
2259                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2260                               addr, tags);
2261                 kfree(tags);
2262         }
2263 }
2264 
2265 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2266 {
2267         int i;
2268 
2269         if (!sip || !bond_has_this_ip(bond, tip)) {
2270                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2271                            &sip, &tip);
2272                 return;
2273         }
2274 
2275         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2276         if (i == -1) {
2277                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2278                            &sip);
2279                 return;
2280         }
2281         slave->last_rx = jiffies;
2282         slave->target_last_arp_rx[i] = jiffies;
2283 }
2284 
2285 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2286                  struct slave *slave)
2287 {
2288         struct arphdr *arp = (struct arphdr *)skb->data;
2289         struct slave *curr_active_slave;
2290         unsigned char *arp_ptr;
2291         __be32 sip, tip;
2292         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2293 
2294         if (!slave_do_arp_validate(bond, slave)) {
2295                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2296                     !slave_do_arp_validate_only(bond))
2297                         slave->last_rx = jiffies;
2298                 return RX_HANDLER_ANOTHER;
2299         } else if (!is_arp) {
2300                 return RX_HANDLER_ANOTHER;
2301         }
2302 
2303         alen = arp_hdr_len(bond->dev);
2304 
2305         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2306                    skb->dev->name);
2307 
2308         if (alen > skb_headlen(skb)) {
2309                 arp = kmalloc(alen, GFP_ATOMIC);
2310                 if (!arp)
2311                         goto out_unlock;
2312                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2313                         goto out_unlock;
2314         }
2315 
2316         if (arp->ar_hln != bond->dev->addr_len ||
2317             skb->pkt_type == PACKET_OTHERHOST ||
2318             skb->pkt_type == PACKET_LOOPBACK ||
2319             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2320             arp->ar_pro != htons(ETH_P_IP) ||
2321             arp->ar_pln != 4)
2322                 goto out_unlock;
2323 
2324         arp_ptr = (unsigned char *)(arp + 1);
2325         arp_ptr += bond->dev->addr_len;
2326         memcpy(&sip, arp_ptr, 4);
2327         arp_ptr += 4 + bond->dev->addr_len;
2328         memcpy(&tip, arp_ptr, 4);
2329 
2330         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2331                    slave->dev->name, bond_slave_state(slave),
2332                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2333                      &sip, &tip);
2334 
2335         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2336 
2337         /* Backup slaves won't see the ARP reply, but do come through
2338          * here for each ARP probe (so we swap the sip/tip to validate
2339          * the probe).  In a "redundant switch, common router" type of
2340          * configuration, the ARP probe will (hopefully) travel from
2341          * the active, through one switch, the router, then the other
2342          * switch before reaching the backup.
2343          *
2344          * We 'trust' the arp requests if there is an active slave and
2345          * it received valid arp reply(s) after it became active. This
2346          * is done to avoid endless looping when we can't reach the
2347          * arp_ip_target and fool ourselves with our own arp requests.
2348          */
2349 
2350         if (bond_is_active_slave(slave))
2351                 bond_validate_arp(bond, slave, sip, tip);
2352         else if (curr_active_slave &&
2353                  time_after(slave_last_rx(bond, curr_active_slave),
2354                             curr_active_slave->last_link_up))
2355                 bond_validate_arp(bond, slave, tip, sip);
2356 
2357 out_unlock:
2358         if (arp != (struct arphdr *)skb->data)
2359                 kfree(arp);
2360         return RX_HANDLER_ANOTHER;
2361 }
2362 
2363 /* function to verify if we're in the arp_interval timeslice, returns true if
2364  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2365  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2366  */
2367 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2368                                   int mod)
2369 {
2370         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2371 
2372         return time_in_range(jiffies,
2373                              last_act - delta_in_ticks,
2374                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2375 }
2376 
2377 /* This function is called regularly to monitor each slave's link
2378  * ensuring that traffic is being sent and received when arp monitoring
2379  * is used in load-balancing mode. if the adapter has been dormant, then an
2380  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2381  * arp monitoring in active backup mode.
2382  */
2383 static void bond_loadbalance_arp_mon(struct work_struct *work)
2384 {
2385         struct bonding *bond = container_of(work, struct bonding,
2386                                             arp_work.work);
2387         struct slave *slave, *oldcurrent;
2388         struct list_head *iter;
2389         int do_failover = 0, slave_state_changed = 0;
2390 
2391         if (!bond_has_slaves(bond))
2392                 goto re_arm;
2393 
2394         rcu_read_lock();
2395 
2396         oldcurrent = rcu_dereference(bond->curr_active_slave);
2397         /* see if any of the previous devices are up now (i.e. they have
2398          * xmt and rcv traffic). the curr_active_slave does not come into
2399          * the picture unless it is null. also, slave->last_link_up is not
2400          * needed here because we send an arp on each slave and give a slave
2401          * as long as it needs to get the tx/rx within the delta.
2402          * TODO: what about up/down delay in arp mode? it wasn't here before
2403          *       so it can wait
2404          */
2405         bond_for_each_slave_rcu(bond, slave, iter) {
2406                 unsigned long trans_start = dev_trans_start(slave->dev);
2407 
2408                 if (slave->link != BOND_LINK_UP) {
2409                         if (bond_time_in_interval(bond, trans_start, 1) &&
2410                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2411 
2412                                 slave->link  = BOND_LINK_UP;
2413                                 slave_state_changed = 1;
2414 
2415                                 /* primary_slave has no meaning in round-robin
2416                                  * mode. the window of a slave being up and
2417                                  * curr_active_slave being null after enslaving
2418                                  * is closed.
2419                                  */
2420                                 if (!oldcurrent) {
2421                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2422                                                     slave->dev->name);
2423                                         do_failover = 1;
2424                                 } else {
2425                                         netdev_info(bond->dev, "interface %s is now up\n",
2426                                                     slave->dev->name);
2427                                 }
2428                         }
2429                 } else {
2430                         /* slave->link == BOND_LINK_UP */
2431 
2432                         /* not all switches will respond to an arp request
2433                          * when the source ip is 0, so don't take the link down
2434                          * if we don't know our ip yet
2435                          */
2436                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2437                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2438 
2439                                 slave->link  = BOND_LINK_DOWN;
2440                                 slave_state_changed = 1;
2441 
2442                                 if (slave->link_failure_count < UINT_MAX)
2443                                         slave->link_failure_count++;
2444 
2445                                 netdev_info(bond->dev, "interface %s is now down\n",
2446                                             slave->dev->name);
2447 
2448                                 if (slave == oldcurrent)
2449                                         do_failover = 1;
2450                         }
2451                 }
2452 
2453                 /* note: if switch is in round-robin mode, all links
2454                  * must tx arp to ensure all links rx an arp - otherwise
2455                  * links may oscillate or not come up at all; if switch is
2456                  * in something like xor mode, there is nothing we can
2457                  * do - all replies will be rx'ed on same link causing slaves
2458                  * to be unstable during low/no traffic periods
2459                  */
2460                 if (bond_slave_is_up(slave))
2461                         bond_arp_send_all(bond, slave);
2462         }
2463 
2464         rcu_read_unlock();
2465 
2466         if (do_failover || slave_state_changed) {
2467                 if (!rtnl_trylock())
2468                         goto re_arm;
2469 
2470                 if (slave_state_changed) {
2471                         bond_slave_state_change(bond);
2472                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2473                                 bond_update_slave_arr(bond, NULL);
2474                 }
2475                 if (do_failover) {
2476                         block_netpoll_tx();
2477                         bond_select_active_slave(bond);
2478                         unblock_netpoll_tx();
2479                 }
2480                 rtnl_unlock();
2481         }
2482 
2483 re_arm:
2484         if (bond->params.arp_interval)
2485                 queue_delayed_work(bond->wq, &bond->arp_work,
2486                                    msecs_to_jiffies(bond->params.arp_interval));
2487 }
2488 
2489 /* Called to inspect slaves for active-backup mode ARP monitor link state
2490  * changes.  Sets new_link in slaves to specify what action should take
2491  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2492  * to link states must be committed.
2493  *
2494  * Called with rcu_read_lock held.
2495  */
2496 static int bond_ab_arp_inspect(struct bonding *bond)
2497 {
2498         unsigned long trans_start, last_rx;
2499         struct list_head *iter;
2500         struct slave *slave;
2501         int commit = 0;
2502 
2503         bond_for_each_slave_rcu(bond, slave, iter) {
2504                 slave->new_link = BOND_LINK_NOCHANGE;
2505                 last_rx = slave_last_rx(bond, slave);
2506 
2507                 if (slave->link != BOND_LINK_UP) {
2508                         if (bond_time_in_interval(bond, last_rx, 1)) {
2509                                 slave->new_link = BOND_LINK_UP;
2510                                 commit++;
2511                         }
2512                         continue;
2513                 }
2514 
2515                 /* Give slaves 2*delta after being enslaved or made
2516                  * active.  This avoids bouncing, as the last receive
2517                  * times need a full ARP monitor cycle to be updated.
2518                  */
2519                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2520                         continue;
2521 
2522                 /* Backup slave is down if:
2523                  * - No current_arp_slave AND
2524                  * - more than 3*delta since last receive AND
2525                  * - the bond has an IP address
2526                  *
2527                  * Note: a non-null current_arp_slave indicates
2528                  * the curr_active_slave went down and we are
2529                  * searching for a new one; under this condition
2530                  * we only take the curr_active_slave down - this
2531                  * gives each slave a chance to tx/rx traffic
2532                  * before being taken out
2533                  */
2534                 if (!bond_is_active_slave(slave) &&
2535                     !rcu_access_pointer(bond->current_arp_slave) &&
2536                     !bond_time_in_interval(bond, last_rx, 3)) {
2537                         slave->new_link = BOND_LINK_DOWN;
2538                         commit++;
2539                 }
2540 
2541                 /* Active slave is down if:
2542                  * - more than 2*delta since transmitting OR
2543                  * - (more than 2*delta since receive AND
2544                  *    the bond has an IP address)
2545                  */
2546                 trans_start = dev_trans_start(slave->dev);
2547                 if (bond_is_active_slave(slave) &&
2548                     (!bond_time_in_interval(bond, trans_start, 2) ||
2549                      !bond_time_in_interval(bond, last_rx, 2))) {
2550                         slave->new_link = BOND_LINK_DOWN;
2551                         commit++;
2552                 }
2553         }
2554 
2555         return commit;
2556 }
2557 
2558 /* Called to commit link state changes noted by inspection step of
2559  * active-backup mode ARP monitor.
2560  *
2561  * Called with RTNL hold.
2562  */
2563 static void bond_ab_arp_commit(struct bonding *bond)
2564 {
2565         unsigned long trans_start;
2566         struct list_head *iter;
2567         struct slave *slave;
2568 
2569         bond_for_each_slave(bond, slave, iter) {
2570                 switch (slave->new_link) {
2571                 case BOND_LINK_NOCHANGE:
2572                         continue;
2573 
2574                 case BOND_LINK_UP:
2575                         trans_start = dev_trans_start(slave->dev);
2576                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2577                             (!rtnl_dereference(bond->curr_active_slave) &&
2578                              bond_time_in_interval(bond, trans_start, 1))) {
2579                                 struct slave *current_arp_slave;
2580 
2581                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2582                                 slave->link = BOND_LINK_UP;
2583                                 if (current_arp_slave) {
2584                                         bond_set_slave_inactive_flags(
2585                                                 current_arp_slave,
2586                                                 BOND_SLAVE_NOTIFY_NOW);
2587                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2588                                 }
2589 
2590                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2591                                             slave->dev->name);
2592 
2593                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2594                                     slave == rtnl_dereference(bond->primary_slave))
2595                                         goto do_failover;
2596 
2597                         }
2598 
2599                         continue;
2600 
2601                 case BOND_LINK_DOWN:
2602                         if (slave->link_failure_count < UINT_MAX)
2603                                 slave->link_failure_count++;
2604 
2605                         slave->link = BOND_LINK_DOWN;
2606                         bond_set_slave_inactive_flags(slave,
2607                                                       BOND_SLAVE_NOTIFY_NOW);
2608 
2609                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2610                                     slave->dev->name);
2611 
2612                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2613                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2614                                 goto do_failover;
2615                         }
2616 
2617                         continue;
2618 
2619                 default:
2620                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2621                                    slave->new_link, slave->dev->name);
2622                         continue;
2623                 }
2624 
2625 do_failover:
2626                 block_netpoll_tx();
2627                 bond_select_active_slave(bond);
2628                 unblock_netpoll_tx();
2629         }
2630 
2631         bond_set_carrier(bond);
2632 }
2633 
2634 /* Send ARP probes for active-backup mode ARP monitor.
2635  *
2636  * Called with rcu_read_lock held.
2637  */
2638 static bool bond_ab_arp_probe(struct bonding *bond)
2639 {
2640         struct slave *slave, *before = NULL, *new_slave = NULL,
2641                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2642                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2643         struct list_head *iter;
2644         bool found = false;
2645         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2646 
2647         if (curr_arp_slave && curr_active_slave)
2648                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2649                             curr_arp_slave->dev->name,
2650                             curr_active_slave->dev->name);
2651 
2652         if (curr_active_slave) {
2653                 bond_arp_send_all(bond, curr_active_slave);
2654                 return should_notify_rtnl;
2655         }
2656 
2657         /* if we don't have a curr_active_slave, search for the next available
2658          * backup slave from the current_arp_slave and make it the candidate
2659          * for becoming the curr_active_slave
2660          */
2661 
2662         if (!curr_arp_slave) {
2663                 curr_arp_slave = bond_first_slave_rcu(bond);
2664                 if (!curr_arp_slave)
2665                         return should_notify_rtnl;
2666         }
2667 
2668         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2669 
2670         bond_for_each_slave_rcu(bond, slave, iter) {
2671                 if (!found && !before && bond_slave_is_up(slave))
2672                         before = slave;
2673 
2674                 if (found && !new_slave && bond_slave_is_up(slave))
2675                         new_slave = slave;
2676                 /* if the link state is up at this point, we
2677                  * mark it down - this can happen if we have
2678                  * simultaneous link failures and
2679                  * reselect_active_interface doesn't make this
2680                  * one the current slave so it is still marked
2681                  * up when it is actually down
2682                  */
2683                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2684                         slave->link = BOND_LINK_DOWN;
2685                         if (slave->link_failure_count < UINT_MAX)
2686                                 slave->link_failure_count++;
2687 
2688                         bond_set_slave_inactive_flags(slave,
2689                                                       BOND_SLAVE_NOTIFY_LATER);
2690 
2691                         netdev_info(bond->dev, "backup interface %s is now down\n",
2692                                     slave->dev->name);
2693                 }
2694                 if (slave == curr_arp_slave)
2695                         found = true;
2696         }
2697 
2698         if (!new_slave && before)
2699                 new_slave = before;
2700 
2701         if (!new_slave)
2702                 goto check_state;
2703 
2704         new_slave->link = BOND_LINK_BACK;
2705         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2706         bond_arp_send_all(bond, new_slave);
2707         new_slave->last_link_up = jiffies;
2708         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2709 
2710 check_state:
2711         bond_for_each_slave_rcu(bond, slave, iter) {
2712                 if (slave->should_notify) {
2713                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2714                         break;
2715                 }
2716         }
2717         return should_notify_rtnl;
2718 }
2719 
2720 static void bond_activebackup_arp_mon(struct work_struct *work)
2721 {
2722         struct bonding *bond = container_of(work, struct bonding,
2723                                             arp_work.work);
2724         bool should_notify_peers = false;
2725         bool should_notify_rtnl = false;
2726         int delta_in_ticks;
2727 
2728         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2729 
2730         if (!bond_has_slaves(bond))
2731                 goto re_arm;
2732 
2733         rcu_read_lock();
2734 
2735         should_notify_peers = bond_should_notify_peers(bond);
2736 
2737         if (bond_ab_arp_inspect(bond)) {
2738                 rcu_read_unlock();
2739 
2740                 /* Race avoidance with bond_close flush of workqueue */
2741                 if (!rtnl_trylock()) {
2742                         delta_in_ticks = 1;
2743                         should_notify_peers = false;
2744                         goto re_arm;
2745                 }
2746 
2747                 bond_ab_arp_commit(bond);
2748 
2749                 rtnl_unlock();
2750                 rcu_read_lock();
2751         }
2752 
2753         should_notify_rtnl = bond_ab_arp_probe(bond);
2754         rcu_read_unlock();
2755 
2756 re_arm:
2757         if (bond->params.arp_interval)
2758                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2759 
2760         if (should_notify_peers || should_notify_rtnl) {
2761                 if (!rtnl_trylock())
2762                         return;
2763 
2764                 if (should_notify_peers)
2765                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2766                                                  bond->dev);
2767                 if (should_notify_rtnl)
2768                         bond_slave_state_notify(bond);
2769 
2770                 rtnl_unlock();
2771         }
2772 }
2773 
2774 /*-------------------------- netdev event handling --------------------------*/
2775 
2776 /* Change device name */
2777 static int bond_event_changename(struct bonding *bond)
2778 {
2779         bond_remove_proc_entry(bond);
2780         bond_create_proc_entry(bond);
2781 
2782         bond_debug_reregister(bond);
2783 
2784         return NOTIFY_DONE;
2785 }
2786 
2787 static int bond_master_netdev_event(unsigned long event,
2788                                     struct net_device *bond_dev)
2789 {
2790         struct bonding *event_bond = netdev_priv(bond_dev);
2791 
2792         switch (event) {
2793         case NETDEV_CHANGENAME:
2794                 return bond_event_changename(event_bond);
2795         case NETDEV_UNREGISTER:
2796                 bond_remove_proc_entry(event_bond);
2797                 break;
2798         case NETDEV_REGISTER:
2799                 bond_create_proc_entry(event_bond);
2800                 break;
2801         case NETDEV_NOTIFY_PEERS:
2802                 if (event_bond->send_peer_notif)
2803                         event_bond->send_peer_notif--;
2804                 break;
2805         default:
2806                 break;
2807         }
2808 
2809         return NOTIFY_DONE;
2810 }
2811 
2812 static int bond_slave_netdev_event(unsigned long event,
2813                                    struct net_device *slave_dev)
2814 {
2815         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2816         struct bonding *bond;
2817         struct net_device *bond_dev;
2818         u32 old_speed;
2819         u8 old_duplex;
2820 
2821         /* A netdev event can be generated while enslaving a device
2822          * before netdev_rx_handler_register is called in which case
2823          * slave will be NULL
2824          */
2825         if (!slave)
2826                 return NOTIFY_DONE;
2827         bond_dev = slave->bond->dev;
2828         bond = slave->bond;
2829         primary = rtnl_dereference(bond->primary_slave);
2830 
2831         switch (event) {
2832         case NETDEV_UNREGISTER:
2833                 if (bond_dev->type != ARPHRD_ETHER)
2834                         bond_release_and_destroy(bond_dev, slave_dev);
2835                 else
2836                         bond_release(bond_dev, slave_dev);
2837                 break;
2838         case NETDEV_UP:
2839         case NETDEV_CHANGE:
2840                 old_speed = slave->speed;
2841                 old_duplex = slave->duplex;
2842 
2843                 bond_update_speed_duplex(slave);
2844 
2845                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2846                         if (old_speed != slave->speed)
2847                                 bond_3ad_adapter_speed_changed(slave);
2848                         if (old_duplex != slave->duplex)
2849                                 bond_3ad_adapter_duplex_changed(slave);
2850                 }
2851                 /* Refresh slave-array if applicable!
2852                  * If the setup does not use miimon or arpmon (mode-specific!),
2853                  * then these events will not cause the slave-array to be
2854                  * refreshed. This will cause xmit to use a slave that is not
2855                  * usable. Avoid such situation by refeshing the array at these
2856                  * events. If these (miimon/arpmon) parameters are configured
2857                  * then array gets refreshed twice and that should be fine!
2858                  */
2859                 if (bond_mode_uses_xmit_hash(bond))
2860                         bond_update_slave_arr(bond, NULL);
2861                 break;
2862         case NETDEV_DOWN:
2863                 if (bond_mode_uses_xmit_hash(bond))
2864                         bond_update_slave_arr(bond, NULL);
2865                 break;
2866         case NETDEV_CHANGEMTU:
2867                 /* TODO: Should slaves be allowed to
2868                  * independently alter their MTU?  For
2869                  * an active-backup bond, slaves need
2870                  * not be the same type of device, so
2871                  * MTUs may vary.  For other modes,
2872                  * slaves arguably should have the
2873                  * same MTUs. To do this, we'd need to
2874                  * take over the slave's change_mtu
2875                  * function for the duration of their
2876                  * servitude.
2877                  */
2878                 break;
2879         case NETDEV_CHANGENAME:
2880                 /* we don't care if we don't have primary set */
2881                 if (!bond_uses_primary(bond) ||
2882                     !bond->params.primary[0])
2883                         break;
2884 
2885                 if (slave == primary) {
2886                         /* slave's name changed - he's no longer primary */
2887                         RCU_INIT_POINTER(bond->primary_slave, NULL);
2888                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2889                         /* we have a new primary slave */
2890                         rcu_assign_pointer(bond->primary_slave, slave);
2891                 } else { /* we didn't change primary - exit */
2892                         break;
2893                 }
2894 
2895                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2896                             primary ? slave_dev->name : "none");
2897 
2898                 block_netpoll_tx();
2899                 bond_select_active_slave(bond);
2900                 unblock_netpoll_tx();
2901                 break;
2902         case NETDEV_FEAT_CHANGE:
2903                 bond_compute_features(bond);
2904                 break;
2905         case NETDEV_RESEND_IGMP:
2906                 /* Propagate to master device */
2907                 call_netdevice_notifiers(event, slave->bond->dev);
2908                 break;
2909         default:
2910                 break;
2911         }
2912 
2913         return NOTIFY_DONE;
2914 }
2915 
2916 /* bond_netdev_event: handle netdev notifier chain events.
2917  *
2918  * This function receives events for the netdev chain.  The caller (an
2919  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2920  * locks for us to safely manipulate the slave devices (RTNL lock,
2921  * dev_probe_lock).
2922  */
2923 static int bond_netdev_event(struct notifier_block *this,
2924                              unsigned long event, void *ptr)
2925 {
2926         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2927 
2928         netdev_dbg(event_dev, "event: %lx\n", event);
2929 
2930         if (!(event_dev->priv_flags & IFF_BONDING))
2931                 return NOTIFY_DONE;
2932 
2933         if (event_dev->flags & IFF_MASTER) {
2934                 netdev_dbg(event_dev, "IFF_MASTER\n");
2935                 return bond_master_netdev_event(event, event_dev);
2936         }
2937 
2938         if (event_dev->flags & IFF_SLAVE) {
2939                 netdev_dbg(event_dev, "IFF_SLAVE\n");
2940                 return bond_slave_netdev_event(event, event_dev);
2941         }
2942 
2943         return NOTIFY_DONE;
2944 }
2945 
2946 static struct notifier_block bond_netdev_notifier = {
2947         .notifier_call = bond_netdev_event,
2948 };
2949 
2950 /*---------------------------- Hashing Policies -----------------------------*/
2951 
2952 /* L2 hash helper */
2953 static inline u32 bond_eth_hash(struct sk_buff *skb)
2954 {
2955         struct ethhdr *ep, hdr_tmp;
2956 
2957         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
2958         if (ep)
2959                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
2960         return 0;
2961 }
2962 
2963 /* Extract the appropriate headers based on bond's xmit policy */
2964 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2965                               struct flow_keys *fk)
2966 {
2967         const struct ipv6hdr *iph6;
2968         const struct iphdr *iph;
2969         int noff, proto = -1;
2970 
2971         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2972                 return skb_flow_dissect(skb, fk);
2973 
2974         fk->ports = 0;
2975         noff = skb_network_offset(skb);
2976         if (skb->protocol == htons(ETH_P_IP)) {
2977                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
2978                         return false;
2979                 iph = ip_hdr(skb);
2980                 fk->src = iph->saddr;
2981                 fk->dst = iph->daddr;
2982                 noff += iph->ihl << 2;
2983                 if (!ip_is_fragment(iph))
2984                         proto = iph->protocol;
2985         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2986                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
2987                         return false;
2988                 iph6 = ipv6_hdr(skb);
2989                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2990                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2991                 noff += sizeof(*iph6);
2992                 proto = iph6->nexthdr;
2993         } else {
2994                 return false;
2995         }
2996         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
2997                 fk->ports = skb_flow_get_ports(skb, noff, proto);
2998 
2999         return true;
3000 }
3001 
3002 /**
3003  * bond_xmit_hash - generate a hash value based on the xmit policy
3004  * @bond: bonding device
3005  * @skb: buffer to use for headers
3006  *
3007  * This function will extract the necessary headers from the skb buffer and use
3008  * them to generate a hash based on the xmit_policy set in the bonding device
3009  */
3010 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3011 {
3012         struct flow_keys flow;
3013         u32 hash;
3014 
3015         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3016             !bond_flow_dissect(bond, skb, &flow))
3017                 return bond_eth_hash(skb);
3018 
3019         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3020             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3021                 hash = bond_eth_hash(skb);
3022         else
3023                 hash = (__force u32)flow.ports;
3024         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3025         hash ^= (hash >> 16);
3026         hash ^= (hash >> 8);
3027 
3028         return hash;
3029 }
3030 
3031 /*-------------------------- Device entry points ----------------------------*/
3032 
3033 static void bond_work_init_all(struct bonding *bond)
3034 {
3035         INIT_DELAYED_WORK(&bond->mcast_work,
3036                           bond_resend_igmp_join_requests_delayed);
3037         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3038         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3039         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3040                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3041         else
3042                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3043         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3044         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3045 }
3046 
3047 static void bond_work_cancel_all(struct bonding *bond)
3048 {
3049         cancel_delayed_work_sync(&bond->mii_work);
3050         cancel_delayed_work_sync(&bond->arp_work);
3051         cancel_delayed_work_sync(&bond->alb_work);
3052         cancel_delayed_work_sync(&bond->ad_work);
3053         cancel_delayed_work_sync(&bond->mcast_work);
3054         cancel_delayed_work_sync(&bond->slave_arr_work);
3055 }
3056 
3057 static int bond_open(struct net_device *bond_dev)
3058 {
3059         struct bonding *bond = netdev_priv(bond_dev);
3060         struct list_head *iter;
3061         struct slave *slave;
3062 
3063         /* reset slave->backup and slave->inactive */
3064         if (bond_has_slaves(bond)) {
3065                 bond_for_each_slave(bond, slave, iter) {
3066                         if (bond_uses_primary(bond) &&
3067                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3068                                 bond_set_slave_inactive_flags(slave,
3069                                                               BOND_SLAVE_NOTIFY_NOW);
3070                         } else {
3071                                 bond_set_slave_active_flags(slave,
3072                                                             BOND_SLAVE_NOTIFY_NOW);
3073                         }
3074                 }
3075         }
3076 
3077         bond_work_init_all(bond);
3078 
3079         if (bond_is_lb(bond)) {
3080                 /* bond_alb_initialize must be called before the timer
3081                  * is started.
3082                  */
3083                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3084                         return -ENOMEM;
3085                 if (bond->params.tlb_dynamic_lb)
3086                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3087         }
3088 
3089         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3090                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3091 
3092         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3093                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3094                 bond->recv_probe = bond_arp_rcv;
3095         }
3096 
3097         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3098                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3099                 /* register to receive LACPDUs */
3100                 bond->recv_probe = bond_3ad_lacpdu_recv;
3101                 bond_3ad_initiate_agg_selection(bond, 1);
3102         }
3103 
3104         if (bond_mode_uses_xmit_hash(bond))
3105                 bond_update_slave_arr(bond, NULL);
3106 
3107         return 0;
3108 }
3109 
3110 static int bond_close(struct net_device *bond_dev)
3111 {
3112         struct bonding *bond = netdev_priv(bond_dev);
3113 
3114         bond_work_cancel_all(bond);
3115         bond->send_peer_notif = 0;
3116         if (bond_is_lb(bond))
3117                 bond_alb_deinitialize(bond);
3118         bond->recv_probe = NULL;
3119 
3120         return 0;
3121 }
3122 
3123 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3124                                                 struct rtnl_link_stats64 *stats)
3125 {
3126         struct bonding *bond = netdev_priv(bond_dev);
3127         struct rtnl_link_stats64 temp;
3128         struct list_head *iter;
3129         struct slave *slave;
3130 
3131         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3132 
3133         bond_for_each_slave(bond, slave, iter) {
3134                 const struct rtnl_link_stats64 *sstats =
3135                         dev_get_stats(slave->dev, &temp);
3136                 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3137 
3138                 stats->rx_packets +=  sstats->rx_packets - pstats->rx_packets;
3139                 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3140                 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3141                 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3142 
3143                 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3144                 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3145                 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3146                 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3147 
3148                 stats->multicast += sstats->multicast - pstats->multicast;
3149                 stats->collisions += sstats->collisions - pstats->collisions;
3150 
3151                 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3152                 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3153                 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3154                 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3155                 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3156                 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3157 
3158                 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3159                 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3160                 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3161                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3162                 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3163 
3164                 /* save off the slave stats for the next run */
3165                 memcpy(pstats, sstats, sizeof(*sstats));
3166         }
3167         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3168 
3169         return stats;
3170 }
3171 
3172 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3173 {
3174         struct bonding *bond = netdev_priv(bond_dev);
3175         struct net_device *slave_dev = NULL;
3176         struct ifbond k_binfo;
3177         struct ifbond __user *u_binfo = NULL;
3178         struct ifslave k_sinfo;
3179         struct ifslave __user *u_sinfo = NULL;
3180         struct mii_ioctl_data *mii = NULL;
3181         struct bond_opt_value newval;
3182         struct net *net;
3183         int res = 0;
3184 
3185         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3186 
3187         switch (cmd) {
3188         case SIOCGMIIPHY:
3189                 mii = if_mii(ifr);
3190                 if (!mii)
3191                         return -EINVAL;
3192 
3193                 mii->phy_id = 0;
3194                 /* Fall Through */
3195         case SIOCGMIIREG:
3196                 /* We do this again just in case we were called by SIOCGMIIREG
3197                  * instead of SIOCGMIIPHY.
3198                  */
3199                 mii = if_mii(ifr);
3200                 if (!mii)
3201                         return -EINVAL;
3202 
3203                 if (mii->reg_num == 1) {
3204                         mii->val_out = 0;
3205                         if (netif_carrier_ok(bond->dev))
3206                                 mii->val_out = BMSR_LSTATUS;
3207                 }
3208 
3209                 return 0;
3210         case BOND_INFO_QUERY_OLD:
3211         case SIOCBONDINFOQUERY:
3212                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3213 
3214                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3215                         return -EFAULT;
3216 
3217                 res = bond_info_query(bond_dev, &k_binfo);
3218                 if (res == 0 &&
3219                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3220                         return -EFAULT;
3221 
3222                 return res;
3223         case BOND_SLAVE_INFO_QUERY_OLD:
3224         case SIOCBONDSLAVEINFOQUERY:
3225                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3226 
3227                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3228                         return -EFAULT;
3229 
3230                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3231                 if (res == 0 &&
3232                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3233                         return -EFAULT;
3234 
3235                 return res;
3236         default:
3237                 break;
3238         }
3239 
3240         net = dev_net(bond_dev);
3241 
3242         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3243                 return -EPERM;
3244 
3245         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3246 
3247         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3248 
3249         if (!slave_dev)
3250                 return -ENODEV;
3251 
3252         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3253         switch (cmd) {
3254         case BOND_ENSLAVE_OLD:
3255         case SIOCBONDENSLAVE:
3256                 res = bond_enslave(bond_dev, slave_dev);
3257                 break;
3258         case BOND_RELEASE_OLD:
3259         case SIOCBONDRELEASE:
3260                 res = bond_release(bond_dev, slave_dev);
3261                 break;
3262         case BOND_SETHWADDR_OLD:
3263         case SIOCBONDSETHWADDR:
3264                 bond_set_dev_addr(bond_dev, slave_dev);
3265                 res = 0;
3266                 break;
3267         case BOND_CHANGE_ACTIVE_OLD:
3268         case SIOCBONDCHANGEACTIVE:
3269                 bond_opt_initstr(&newval, slave_dev->name);
3270                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3271                 break;
3272         default:
3273                 res = -EOPNOTSUPP;
3274         }
3275 
3276         return res;
3277 }
3278 
3279 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3280 {
3281         struct bonding *bond = netdev_priv(bond_dev);
3282 
3283         if (change & IFF_PROMISC)
3284                 bond_set_promiscuity(bond,
3285                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3286 
3287         if (change & IFF_ALLMULTI)
3288                 bond_set_allmulti(bond,
3289                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3290 }
3291 
3292 static void bond_set_rx_mode(struct net_device *bond_dev)
3293 {
3294         struct bonding *bond = netdev_priv(bond_dev);
3295         struct list_head *iter;
3296         struct slave *slave;
3297 
3298         rcu_read_lock();
3299         if (bond_uses_primary(bond)) {
3300                 slave = rcu_dereference(bond->curr_active_slave);
3301                 if (slave) {
3302                         dev_uc_sync(slave->dev, bond_dev);
3303                         dev_mc_sync(slave->dev, bond_dev);
3304                 }
3305         } else {
3306                 bond_for_each_slave_rcu(bond, slave, iter) {
3307                         dev_uc_sync_multiple(slave->dev, bond_dev);
3308                         dev_mc_sync_multiple(slave->dev, bond_dev);
3309                 }
3310         }
3311         rcu_read_unlock();
3312 }
3313 
3314 static int bond_neigh_init(struct neighbour *n)
3315 {
3316         struct bonding *bond = netdev_priv(n->dev);
3317         const struct net_device_ops *slave_ops;
3318         struct neigh_parms parms;
3319         struct slave *slave;
3320         int ret;
3321 
3322         slave = bond_first_slave(bond);
3323         if (!slave)
3324                 return 0;
3325         slave_ops = slave->dev->netdev_ops;
3326         if (!slave_ops->ndo_neigh_setup)
3327                 return 0;
3328 
3329         parms.neigh_setup = NULL;
3330         parms.neigh_cleanup = NULL;
3331         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3332         if (ret)
3333                 return ret;
3334 
3335         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3336          * after the last slave has been detached.  Assumes that all slaves
3337          * utilize the same neigh_cleanup (true at this writing as only user
3338          * is ipoib).
3339          */
3340         n->parms->neigh_cleanup = parms.neigh_cleanup;
3341 
3342         if (!parms.neigh_setup)
3343                 return 0;
3344 
3345         return parms.neigh_setup(n);
3346 }
3347 
3348 /* The bonding ndo_neigh_setup is called at init time beofre any
3349  * slave exists. So we must declare proxy setup function which will
3350  * be used at run time to resolve the actual slave neigh param setup.
3351  *
3352  * It's also called by master devices (such as vlans) to setup their
3353  * underlying devices. In that case - do nothing, we're already set up from
3354  * our init.
3355  */
3356 static int bond_neigh_setup(struct net_device *dev,
3357                             struct neigh_parms *parms)
3358 {
3359         /* modify only our neigh_parms */
3360         if (parms->dev == dev)
3361                 parms->neigh_setup = bond_neigh_init;
3362 
3363         return 0;
3364 }
3365 
3366 /* Change the MTU of all of a master's slaves to match the master */
3367 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3368 {
3369         struct bonding *bond = netdev_priv(bond_dev);
3370         struct slave *slave, *rollback_slave;
3371         struct list_head *iter;
3372         int res = 0;
3373 
3374         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3375 
3376         bond_for_each_slave(bond, slave, iter) {
3377                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3378                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3379 
3380                 res = dev_set_mtu(slave->dev, new_mtu);
3381 
3382                 if (res) {
3383                         /* If we failed to set the slave's mtu to the new value
3384                          * we must abort the operation even in ACTIVE_BACKUP
3385                          * mode, because if we allow the backup slaves to have
3386                          * different mtu values than the active slave we'll
3387                          * need to change their mtu when doing a failover. That
3388                          * means changing their mtu from timer context, which
3389                          * is probably not a good idea.
3390                          */
3391                         netdev_dbg(bond_dev, "err %d %s\n", res,
3392                                    slave->dev->name);
3393                         goto unwind;
3394                 }
3395         }
3396 
3397         bond_dev->mtu = new_mtu;
3398 
3399         return 0;
3400 
3401 unwind:
3402         /* unwind from head to the slave that failed */
3403         bond_for_each_slave(bond, rollback_slave, iter) {
3404                 int tmp_res;
3405 
3406                 if (rollback_slave == slave)
3407                         break;
3408 
3409                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3410                 if (tmp_res) {
3411                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3412                                    tmp_res, rollback_slave->dev->name);
3413                 }
3414         }
3415 
3416         return res;
3417 }
3418 
3419 /* Change HW address
3420  *
3421  * Note that many devices must be down to change the HW address, and
3422  * downing the master releases all slaves.  We can make bonds full of
3423  * bonding devices to test this, however.
3424  */
3425 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3426 {
3427         struct bonding *bond = netdev_priv(bond_dev);
3428         struct slave *slave, *rollback_slave;
3429         struct sockaddr *sa = addr, tmp_sa;
3430         struct list_head *iter;
3431         int res = 0;
3432 
3433         if (BOND_MODE(bond) == BOND_MODE_ALB)
3434                 return bond_alb_set_mac_address(bond_dev, addr);
3435 
3436 
3437         netdev_dbg(bond_dev, "bond=%p\n", bond);
3438 
3439         /* If fail_over_mac is enabled, do nothing and return success.
3440          * Returning an error causes ifenslave to fail.
3441          */
3442         if (bond->params.fail_over_mac &&
3443             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3444                 return 0;
3445 
3446         if (!is_valid_ether_addr(sa->sa_data))
3447                 return -EADDRNOTAVAIL;
3448 
3449         bond_for_each_slave(bond, slave, iter) {
3450                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3451                 res = dev_set_mac_address(slave->dev, addr);
3452                 if (res) {
3453                         /* TODO: consider downing the slave
3454                          * and retry ?
3455                          * User should expect communications
3456                          * breakage anyway until ARP finish
3457                          * updating, so...
3458                          */
3459                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3460                         goto unwind;
3461                 }
3462         }
3463 
3464         /* success */
3465         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3466         return 0;
3467 
3468 unwind:
3469         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3470         tmp_sa.sa_family = bond_dev->type;
3471 
3472         /* unwind from head to the slave that failed */
3473         bond_for_each_slave(bond, rollback_slave, iter) {
3474                 int tmp_res;
3475 
3476                 if (rollback_slave == slave)
3477                         break;
3478 
3479                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3480                 if (tmp_res) {
3481                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3482                                    tmp_res, rollback_slave->dev->name);
3483                 }
3484         }
3485 
3486         return res;
3487 }
3488 
3489 /**
3490  * bond_xmit_slave_id - transmit skb through slave with slave_id
3491  * @bond: bonding device that is transmitting
3492  * @skb: buffer to transmit
3493  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3494  *
3495  * This function tries to transmit through slave with slave_id but in case
3496  * it fails, it tries to find the first available slave for transmission.
3497  * The skb is consumed in all cases, thus the function is void.
3498  */
3499 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3500 {
3501         struct list_head *iter;
3502         struct slave *slave;
3503         int i = slave_id;
3504 
3505         /* Here we start from the slave with slave_id */
3506         bond_for_each_slave_rcu(bond, slave, iter) {
3507                 if (--i < 0) {
3508                         if (bond_slave_can_tx(slave)) {
3509                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3510                                 return;
3511                         }
3512                 }
3513         }
3514 
3515         /* Here we start from the first slave up to slave_id */
3516         i = slave_id;
3517         bond_for_each_slave_rcu(bond, slave, iter) {
3518                 if (--i < 0)
3519                         break;
3520                 if (bond_slave_can_tx(slave)) {
3521                         bond_dev_queue_xmit(bond, skb, slave->dev);
3522                         return;
3523                 }
3524         }
3525         /* no slave that can tx has been found */
3526         dev_kfree_skb_any(skb);
3527 }
3528 
3529 /**
3530  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3531  * @bond: bonding device to use
3532  *
3533  * Based on the value of the bonding device's packets_per_slave parameter
3534  * this function generates a slave id, which is usually used as the next
3535  * slave to transmit through.
3536  */
3537 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3538 {
3539         u32 slave_id;
3540         struct reciprocal_value reciprocal_packets_per_slave;
3541         int packets_per_slave = bond->params.packets_per_slave;
3542 
3543         switch (packets_per_slave) {
3544         case 0:
3545                 slave_id = prandom_u32();
3546                 break;
3547         case 1:
3548                 slave_id = bond->rr_tx_counter;
3549                 break;
3550         default:
3551                 reciprocal_packets_per_slave =
3552                         bond->params.reciprocal_packets_per_slave;
3553                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3554                                              reciprocal_packets_per_slave);
3555                 break;
3556         }
3557         bond->rr_tx_counter++;
3558 
3559         return slave_id;
3560 }
3561 
3562 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3563 {
3564         struct bonding *bond = netdev_priv(bond_dev);
3565         struct iphdr *iph = ip_hdr(skb);
3566         struct slave *slave;
3567         u32 slave_id;
3568 
3569         /* Start with the curr_active_slave that joined the bond as the
3570          * default for sending IGMP traffic.  For failover purposes one
3571          * needs to maintain some consistency for the interface that will
3572          * send the join/membership reports.  The curr_active_slave found
3573          * will send all of this type of traffic.
3574          */
3575         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3576                 slave = rcu_dereference(bond->curr_active_slave);
3577                 if (slave)
3578                         bond_dev_queue_xmit(bond, skb, slave->dev);
3579                 else
3580                         bond_xmit_slave_id(bond, skb, 0);
3581         } else {
3582                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3583 
3584                 if (likely(slave_cnt)) {
3585                         slave_id = bond_rr_gen_slave_id(bond);
3586                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3587                 } else {
3588                         dev_kfree_skb_any(skb);
3589                 }
3590         }
3591 
3592         return NETDEV_TX_OK;
3593 }
3594 
3595 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3596  * the bond has a usable interface.
3597  */
3598 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3599 {
3600         struct bonding *bond = netdev_priv(bond_dev);
3601         struct slave *slave;
3602 
3603         slave = rcu_dereference(bond->curr_active_slave);
3604         if (slave)
3605                 bond_dev_queue_xmit(bond, skb, slave->dev);
3606         else
3607                 dev_kfree_skb_any(skb);
3608 
3609         return NETDEV_TX_OK;
3610 }
3611 
3612 /* Use this to update slave_array when (a) it's not appropriate to update
3613  * slave_array right away (note that update_slave_array() may sleep)
3614  * and / or (b) RTNL is not held.
3615  */
3616 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3617 {
3618         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3619 }
3620 
3621 /* Slave array work handler. Holds only RTNL */
3622 static void bond_slave_arr_handler(struct work_struct *work)
3623 {
3624         struct bonding *bond = container_of(work, struct bonding,
3625                                             slave_arr_work.work);
3626         int ret;
3627 
3628         if (!rtnl_trylock())
3629                 goto err;
3630 
3631         ret = bond_update_slave_arr(bond, NULL);
3632         rtnl_unlock();
3633         if (ret) {
3634                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3635                 goto err;
3636         }
3637         return;
3638 
3639 err:
3640         bond_slave_arr_work_rearm(bond, 1);
3641 }
3642 
3643 /* Build the usable slaves array in control path for modes that use xmit-hash
3644  * to determine the slave interface -
3645  * (a) BOND_MODE_8023AD
3646  * (b) BOND_MODE_XOR
3647  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3648  *
3649  * The caller is expected to hold RTNL only and NO other lock!
3650  */
3651 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3652 {
3653         struct slave *slave;
3654         struct list_head *iter;
3655         struct bond_up_slave *new_arr, *old_arr;
3656         int slaves_in_agg;
3657         int agg_id = 0;
3658         int ret = 0;
3659 
3660 #ifdef CONFIG_LOCKDEP
3661         WARN_ON(lockdep_is_held(&bond->mode_lock));
3662 #endif
3663 
3664         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3665                           GFP_KERNEL);
3666         if (!new_arr) {
3667                 ret = -ENOMEM;
3668                 pr_err("Failed to build slave-array.\n");
3669                 goto out;
3670         }
3671         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3672                 struct ad_info ad_info;
3673 
3674                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3675                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3676                         kfree_rcu(new_arr, rcu);
3677                         /* No active aggragator means it's not safe to use
3678                          * the previous array.
3679                          */
3680                         old_arr = rtnl_dereference(bond->slave_arr);
3681                         if (old_arr) {
3682                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3683                                 kfree_rcu(old_arr, rcu);
3684                         }
3685                         goto out;
3686                 }
3687                 slaves_in_agg = ad_info.ports;
3688                 agg_id = ad_info.aggregator_id;
3689         }
3690         bond_for_each_slave(bond, slave, iter) {
3691                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3692                         struct aggregator *agg;
3693 
3694                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3695                         if (!agg || agg->aggregator_identifier != agg_id)
3696                                 continue;
3697                 }
3698                 if (!bond_slave_can_tx(slave))
3699                         continue;
3700                 if (skipslave == slave)
3701                         continue;
3702                 new_arr->arr[new_arr->count++] = slave;
3703         }
3704 
3705         old_arr = rtnl_dereference(bond->slave_arr);
3706         rcu_assign_pointer(bond->slave_arr, new_arr);
3707         if (old_arr)
3708                 kfree_rcu(old_arr, rcu);
3709 out:
3710         if (ret != 0 && skipslave) {
3711                 int idx;
3712 
3713                 /* Rare situation where caller has asked to skip a specific
3714                  * slave but allocation failed (most likely!). BTW this is
3715                  * only possible when the call is initiated from
3716                  * __bond_release_one(). In this situation; overwrite the
3717                  * skipslave entry in the array with the last entry from the
3718                  * array to avoid a situation where the xmit path may choose
3719                  * this to-be-skipped slave to send a packet out.
3720                  */
3721                 old_arr = rtnl_dereference(bond->slave_arr);
3722                 for (idx = 0; idx < old_arr->count; idx++) {
3723                         if (skipslave == old_arr->arr[idx]) {
3724                                 old_arr->arr[idx] =
3725                                     old_arr->arr[old_arr->count-1];
3726                                 old_arr->count--;
3727                                 break;
3728                         }
3729                 }
3730         }
3731         return ret;
3732 }
3733 
3734 /* Use this Xmit function for 3AD as well as XOR modes. The current
3735  * usable slave array is formed in the control path. The xmit function
3736  * just calculates hash and sends the packet out.
3737  */
3738 int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3739 {
3740         struct bonding *bond = netdev_priv(dev);
3741         struct slave *slave;
3742         struct bond_up_slave *slaves;
3743         unsigned int count;
3744 
3745         slaves = rcu_dereference(bond->slave_arr);
3746         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3747         if (likely(count)) {
3748                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3749                 bond_dev_queue_xmit(bond, skb, slave->dev);
3750         } else {
3751                 dev_kfree_skb_any(skb);
3752                 atomic_long_inc(&dev->tx_dropped);
3753         }
3754 
3755         return NETDEV_TX_OK;
3756 }
3757 
3758 /* in broadcast mode, we send everything to all usable interfaces. */
3759 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3760 {
3761         struct bonding *bond = netdev_priv(bond_dev);
3762         struct slave *slave = NULL;
3763         struct list_head *iter;
3764 
3765         bond_for_each_slave_rcu(bond, slave, iter) {
3766                 if (bond_is_last_slave(bond, slave))
3767                         break;
3768                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3769                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3770 
3771                         if (!skb2) {
3772                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3773                                                     bond_dev->name, __func__);
3774                                 continue;
3775                         }
3776                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3777                 }
3778         }
3779         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3780                 bond_dev_queue_xmit(bond, skb, slave->dev);
3781         else
3782                 dev_kfree_skb_any(skb);
3783 
3784         return NETDEV_TX_OK;
3785 }
3786 
3787 /*------------------------- Device initialization ---------------------------*/
3788 
3789 /* Lookup the slave that corresponds to a qid */
3790 static inline int bond_slave_override(struct bonding *bond,
3791                                       struct sk_buff *skb)
3792 {
3793         struct slave *slave = NULL;
3794         struct list_head *iter;
3795 
3796         if (!skb->queue_mapping)
3797                 return 1;
3798 
3799         /* Find out if any slaves have the same mapping as this skb. */
3800         bond_for_each_slave_rcu(bond, slave, iter) {
3801                 if (slave->queue_id == skb->queue_mapping) {
3802                         if (bond_slave_can_tx(slave)) {
3803                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3804                                 return 0;
3805                         }
3806                         /* If the slave isn't UP, use default transmit policy. */
3807                         break;
3808                 }
3809         }
3810 
3811         return 1;
3812 }
3813 
3814 
3815 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3816                              void *accel_priv, select_queue_fallback_t fallback)
3817 {
3818         /* This helper function exists to help dev_pick_tx get the correct
3819          * destination queue.  Using a helper function skips a call to
3820          * skb_tx_hash and will put the skbs in the queue we expect on their
3821          * way down to the bonding driver.
3822          */
3823         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3824 
3825         /* Save the original txq to restore before passing to the driver */
3826         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3827 
3828         if (unlikely(txq >= dev->real_num_tx_queues)) {
3829                 do {
3830                         txq -= dev->real_num_tx_queues;
3831                 } while (txq >= dev->real_num_tx_queues);
3832         }
3833         return txq;
3834 }
3835 
3836 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3837 {
3838         struct bonding *bond = netdev_priv(dev);
3839 
3840         if (bond_should_override_tx_queue(bond) &&
3841             !bond_slave_override(bond, skb))
3842                 return NETDEV_TX_OK;
3843 
3844         switch (BOND_MODE(bond)) {
3845         case BOND_MODE_ROUNDROBIN:
3846                 return bond_xmit_roundrobin(skb, dev);
3847         case BOND_MODE_ACTIVEBACKUP:
3848                 return bond_xmit_activebackup(skb, dev);
3849         case BOND_MODE_8023AD:
3850         case BOND_MODE_XOR:
3851                 return bond_3ad_xor_xmit(skb, dev);
3852         case BOND_MODE_BROADCAST:
3853                 return bond_xmit_broadcast(skb, dev);
3854         case BOND_MODE_ALB:
3855                 return bond_alb_xmit(skb, dev);
3856         case BOND_MODE_TLB:
3857                 return bond_tlb_xmit(skb, dev);
3858         default:
3859                 /* Should never happen, mode already checked */
3860                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3861                 WARN_ON_ONCE(1);
3862                 dev_kfree_skb_any(skb);
3863                 return NETDEV_TX_OK;
3864         }
3865 }
3866 
3867 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3868 {
3869         struct bonding *bond = netdev_priv(dev);
3870         netdev_tx_t ret = NETDEV_TX_OK;
3871 
3872         /* If we risk deadlock from transmitting this in the
3873          * netpoll path, tell netpoll to queue the frame for later tx
3874          */
3875         if (unlikely(is_netpoll_tx_blocked(dev)))
3876                 return NETDEV_TX_BUSY;
3877 
3878         rcu_read_lock();
3879         if (bond_has_slaves(bond))
3880                 ret = __bond_start_xmit(skb, dev);
3881         else
3882                 dev_kfree_skb_any(skb);
3883         rcu_read_unlock();
3884 
3885         return ret;
3886 }
3887 
3888 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3889                                      struct ethtool_cmd *ecmd)
3890 {
3891         struct bonding *bond = netdev_priv(bond_dev);
3892         unsigned long speed = 0;
3893         struct list_head *iter;
3894         struct slave *slave;
3895 
3896         ecmd->duplex = DUPLEX_UNKNOWN;
3897         ecmd->port = PORT_OTHER;
3898 
3899         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3900          * do not need to check mode.  Though link speed might not represent
3901          * the true receive or transmit bandwidth (not all modes are symmetric)
3902          * this is an accurate maximum.
3903          */
3904         bond_for_each_slave(bond, slave, iter) {
3905                 if (bond_slave_can_tx(slave)) {
3906                         if (slave->speed != SPEED_UNKNOWN)
3907                                 speed += slave->speed;
3908                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3909                             slave->duplex != DUPLEX_UNKNOWN)
3910                                 ecmd->duplex = slave->duplex;
3911                 }
3912         }
3913         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3914 
3915         return 0;
3916 }
3917 
3918 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3919                                      struct ethtool_drvinfo *drvinfo)
3920 {
3921         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3922         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3923         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3924                  BOND_ABI_VERSION);
3925 }
3926 
3927 static const struct ethtool_ops bond_ethtool_ops = {
3928         .get_drvinfo            = bond_ethtool_get_drvinfo,
3929         .get_settings           = bond_ethtool_get_settings,
3930         .get_link               = ethtool_op_get_link,
3931 };
3932 
3933 static const struct net_device_ops bond_netdev_ops = {
3934         .ndo_init               = bond_init,
3935         .ndo_uninit             = bond_uninit,
3936         .ndo_open               = bond_open,
3937         .ndo_stop               = bond_close,
3938         .ndo_start_xmit         = bond_start_xmit,
3939         .ndo_select_queue       = bond_select_queue,
3940         .ndo_get_stats64        = bond_get_stats,
3941         .ndo_do_ioctl           = bond_do_ioctl,
3942         .ndo_change_rx_flags    = bond_change_rx_flags,
3943         .ndo_set_rx_mode        = bond_set_rx_mode,
3944         .ndo_change_mtu         = bond_change_mtu,
3945         .ndo_set_mac_address    = bond_set_mac_address,
3946         .ndo_neigh_setup        = bond_neigh_setup,
3947         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3948         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3949 #ifdef CONFIG_NET_POLL_CONTROLLER
3950         .ndo_netpoll_setup      = bond_netpoll_setup,
3951         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3952         .ndo_poll_controller    = bond_poll_controller,
3953 #endif
3954         .ndo_add_slave          = bond_enslave,
3955         .ndo_del_slave          = bond_release,
3956         .ndo_fix_features       = bond_fix_features,
3957 };
3958 
3959 static const struct device_type bond_type = {
3960         .name = "bond",
3961 };
3962 
3963 static void bond_destructor(struct net_device *bond_dev)
3964 {
3965         struct bonding *bond = netdev_priv(bond_dev);
3966         if (bond->wq)
3967                 destroy_workqueue(bond->wq);
3968         free_netdev(bond_dev);
3969 }
3970 
3971 void bond_setup(struct net_device *bond_dev)
3972 {
3973         struct bonding *bond = netdev_priv(bond_dev);
3974 
3975         spin_lock_init(&bond->mode_lock);
3976         bond->params = bonding_defaults;
3977 
3978         /* Initialize pointers */
3979         bond->dev = bond_dev;
3980 
3981         /* Initialize the device entry points */
3982         ether_setup(bond_dev);
3983         bond_dev->netdev_ops = &bond_netdev_ops;
3984         bond_dev->ethtool_ops = &bond_ethtool_ops;
3985 
3986         bond_dev->destructor = bond_destructor;
3987 
3988         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3989 
3990         /* Initialize the device options */
3991         bond_dev->tx_queue_len = 0;
3992         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3993         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
3994         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3995 
3996         /* don't acquire bond device's netif_tx_lock when transmitting */
3997         bond_dev->features |= NETIF_F_LLTX;
3998 
3999         /* By default, we declare the bond to be fully
4000          * VLAN hardware accelerated capable. Special
4001          * care is taken in the various xmit functions
4002          * when there are slaves that are not hw accel
4003          * capable
4004          */
4005 
4006         /* Don't allow bond devices to change network namespaces. */
4007         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4008 
4009         bond_dev->hw_features = BOND_VLAN_FEATURES |
4010                                 NETIF_F_HW_VLAN_CTAG_TX |
4011                                 NETIF_F_HW_VLAN_CTAG_RX |
4012                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4013 
4014         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4015         bond_dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
4016         bond_dev->features |= bond_dev->hw_features;
4017 }
4018 
4019 /* Destroy a bonding device.
4020  * Must be under rtnl_lock when this function is called.
4021  */
4022 static void bond_uninit(struct net_device *bond_dev)
4023 {
4024         struct bonding *bond = netdev_priv(bond_dev);
4025         struct list_head *iter;
4026         struct slave *slave;
4027         struct bond_up_slave *arr;
4028 
4029         bond_netpoll_cleanup(bond_dev);
4030 
4031         /* Release the bonded slaves */
4032         bond_for_each_slave(bond, slave, iter)
4033                 __bond_release_one(bond_dev, slave->dev, true);
4034         netdev_info(bond_dev, "Released all slaves\n");
4035 
4036         arr = rtnl_dereference(bond->slave_arr);
4037         if (arr) {
4038                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4039                 kfree_rcu(arr, rcu);
4040         }
4041 
4042         list_del(&bond->bond_list);
4043 
4044         bond_debug_unregister(bond);
4045 }
4046 
4047 /*------------------------- Module initialization ---------------------------*/
4048 
4049 static int bond_check_params(struct bond_params *params)
4050 {
4051         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4052         struct bond_opt_value newval;
4053         const struct bond_opt_value *valptr;
4054         int arp_all_targets_value;
4055 
4056         /* Convert string parameters. */
4057         if (mode) {
4058                 bond_opt_initstr(&newval, mode);
4059                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4060                 if (!valptr) {
4061                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4062                         return -EINVAL;
4063                 }
4064                 bond_mode = valptr->value;
4065         }
4066 
4067         if (xmit_hash_policy) {
4068                 if ((bond_mode != BOND_MODE_XOR) &&
4069                     (bond_mode != BOND_MODE_8023AD) &&
4070                     (bond_mode != BOND_MODE_TLB)) {
4071                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4072                                 bond_mode_name(bond_mode));
4073                 } else {
4074                         bond_opt_initstr(&newval, xmit_hash_policy);
4075                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4076                                                 &newval);
4077                         if (!valptr) {
4078                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4079                                        xmit_hash_policy);
4080                                 return -EINVAL;
4081                         }
4082                         xmit_hashtype = valptr->value;
4083                 }
4084         }
4085 
4086         if (lacp_rate) {
4087                 if (bond_mode != BOND_MODE_8023AD) {
4088                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4089                                 bond_mode_name(bond_mode));
4090                 } else {
4091                         bond_opt_initstr(&newval, lacp_rate);
4092                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4093                                                 &newval);
4094                         if (!valptr) {
4095                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4096                                        lacp_rate);
4097                                 return -EINVAL;
4098                         }
4099                         lacp_fast = valptr->value;
4100                 }
4101         }
4102 
4103         if (ad_select) {
4104                 bond_opt_initstr(&newval, ad_select);
4105                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4106                                         &newval);
4107                 if (!valptr) {
4108                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4109                         return -EINVAL;
4110                 }
4111                 params->ad_select = valptr->value;
4112                 if (bond_mode != BOND_MODE_8023AD)
4113                         pr_warn("ad_select param only affects 802.3ad mode\n");
4114         } else {
4115                 params->ad_select = BOND_AD_STABLE;
4116         }
4117 
4118         if (max_bonds < 0) {
4119                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4120                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4121                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4122         }
4123 
4124         if (miimon < 0) {
4125                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4126                         miimon, INT_MAX);
4127                 miimon = 0;
4128         }
4129 
4130         if (updelay < 0) {
4131                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4132                         updelay, INT_MAX);
4133                 updelay = 0;
4134         }
4135 
4136         if (downdelay < 0) {
4137                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4138                         downdelay, INT_MAX);
4139                 downdelay = 0;
4140         }
4141 
4142         if ((use_carrier != 0) && (use_carrier != 1)) {
4143                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4144                         use_carrier);
4145                 use_carrier = 1;
4146         }
4147 
4148         if (num_peer_notif < 0 || num_peer_notif > 255) {
4149                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4150                         num_peer_notif);
4151                 num_peer_notif = 1;
4152         }
4153 
4154         /* reset values for 802.3ad/TLB/ALB */
4155         if (!bond_mode_uses_arp(bond_mode)) {
4156                 if (!miimon) {
4157                         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");
4158                         pr_warn("Forcing miimon to 100msec\n");
4159                         miimon = BOND_DEFAULT_MIIMON;
4160                 }
4161         }
4162 
4163         if (tx_queues < 1 || tx_queues > 255) {
4164                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4165                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4166                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4167         }
4168 
4169         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4170                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4171                         all_slaves_active);
4172                 all_slaves_active = 0;
4173         }
4174 
4175         if (resend_igmp < 0 || resend_igmp > 255) {
4176                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4177                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4178                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4179         }
4180 
4181         bond_opt_initval(&newval, packets_per_slave);
4182         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4183                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4184                         packets_per_slave, USHRT_MAX);
4185                 packets_per_slave = 1;
4186         }
4187 
4188         if (bond_mode == BOND_MODE_ALB) {
4189                 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",
4190                           updelay);
4191         }
4192 
4193         if (!miimon) {
4194                 if (updelay || downdelay) {
4195                         /* just warn the user the up/down delay will have
4196                          * no effect since miimon is zero...
4197                          */
4198                         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",
4199                                 updelay, downdelay);
4200                 }
4201         } else {
4202                 /* don't allow arp monitoring */
4203                 if (arp_interval) {
4204                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4205                                 miimon, arp_interval);
4206                         arp_interval = 0;
4207                 }
4208 
4209                 if ((updelay % miimon) != 0) {
4210                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4211                                 updelay, miimon, (updelay / miimon) * miimon);
4212                 }
4213 
4214                 updelay /= miimon;
4215 
4216                 if ((downdelay % miimon) != 0) {
4217                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4218                                 downdelay, miimon,
4219                                 (downdelay / miimon) * miimon);
4220                 }
4221 
4222                 downdelay /= miimon;
4223         }
4224 
4225         if (arp_interval < 0) {
4226                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4227                         arp_interval, INT_MAX);
4228                 arp_interval = 0;
4229         }
4230 
4231         for (arp_ip_count = 0, i = 0;
4232              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4233                 __be32 ip;
4234 
4235                 /* not a complete check, but good enough to catch mistakes */
4236                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4237                     !bond_is_ip_target_ok(ip)) {
4238                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4239                                 arp_ip_target[i]);
4240                         arp_interval = 0;
4241                 } else {
4242                         if (bond_get_targets_ip(arp_target, ip) == -1)
4243                                 arp_target[arp_ip_count++] = ip;
4244                         else
4245                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4246                                         &ip);
4247                 }
4248         }
4249 
4250         if (arp_interval && !arp_ip_count) {
4251                 /* don't allow arping if no arp_ip_target given... */
4252                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4253                         arp_interval);
4254                 arp_interval = 0;
4255         }
4256 
4257         if (arp_validate) {
4258                 if (!arp_interval) {
4259                         pr_err("arp_validate requires arp_interval\n");
4260                         return -EINVAL;
4261                 }
4262 
4263                 bond_opt_initstr(&newval, arp_validate);
4264                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4265                                         &newval);
4266                 if (!valptr) {
4267                         pr_err("Error: invalid arp_validate \"%s\"\n",
4268                                arp_validate);
4269                         return -EINVAL;
4270                 }
4271                 arp_validate_value = valptr->value;
4272         } else {
4273                 arp_validate_value = 0;
4274         }
4275 
4276         arp_all_targets_value = 0;
4277         if (arp_all_targets) {
4278                 bond_opt_initstr(&newval, arp_all_targets);
4279                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4280                                         &newval);
4281                 if (!valptr) {
4282                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4283                                arp_all_targets);
4284                         arp_all_targets_value = 0;
4285                 } else {
4286                         arp_all_targets_value = valptr->value;
4287                 }
4288         }
4289 
4290         if (miimon) {
4291                 pr_info("MII link monitoring set to %d ms\n", miimon);
4292         } else if (arp_interval) {
4293                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4294                                           arp_validate_value);
4295                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4296                         arp_interval, valptr->string, arp_ip_count);
4297 
4298                 for (i = 0; i < arp_ip_count; i++)
4299                         pr_cont(" %s", arp_ip_target[i]);
4300 
4301                 pr_cont("\n");
4302 
4303         } else if (max_bonds) {
4304                 /* miimon and arp_interval not set, we need one so things
4305                  * work as expected, see bonding.txt for details
4306                  */
4307                 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");
4308         }
4309 
4310         if (primary && !bond_mode_uses_primary(bond_mode)) {
4311                 /* currently, using a primary only makes sense
4312                  * in active backup, TLB or ALB modes
4313                  */
4314                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4315                         primary, bond_mode_name(bond_mode));
4316                 primary = NULL;
4317         }
4318 
4319         if (primary && primary_reselect) {
4320                 bond_opt_initstr(&newval, primary_reselect);
4321                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4322                                         &newval);
4323                 if (!valptr) {
4324                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4325                                primary_reselect);
4326                         return -EINVAL;
4327                 }
4328                 primary_reselect_value = valptr->value;
4329         } else {
4330                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4331         }
4332 
4333         if (fail_over_mac) {
4334                 bond_opt_initstr(&newval, fail_over_mac);
4335                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4336                                         &newval);
4337                 if (!valptr) {
4338                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4339                                fail_over_mac);
4340                         return -EINVAL;
4341                 }
4342                 fail_over_mac_value = valptr->value;
4343                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4344                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4345         } else {
4346                 fail_over_mac_value = BOND_FOM_NONE;
4347         }
4348 
4349         if (lp_interval == 0) {
4350                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4351                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4352                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4353         }
4354 
4355         /* fill params struct with the proper values */
4356         params->mode = bond_mode;
4357         params->xmit_policy = xmit_hashtype;
4358         params->miimon = miimon;
4359         params->num_peer_notif = num_peer_notif;
4360         params->arp_interval = arp_interval;
4361         params->arp_validate = arp_validate_value;
4362         params->arp_all_targets = arp_all_targets_value;
4363         params->updelay = updelay;
4364         params->downdelay = downdelay;
4365         params->use_carrier = use_carrier;
4366         params->lacp_fast = lacp_fast;
4367         params->primary[0] = 0;
4368         params->primary_reselect = primary_reselect_value;
4369         params->fail_over_mac = fail_over_mac_value;
4370         params->tx_queues = tx_queues;
4371         params->all_slaves_active = all_slaves_active;
4372         params->resend_igmp = resend_igmp;
4373         params->min_links = min_links;
4374         params->lp_interval = lp_interval;
4375         params->packets_per_slave = packets_per_slave;
4376         params->tlb_dynamic_lb = 1; /* Default value */
4377         if (packets_per_slave > 0) {
4378                 params->reciprocal_packets_per_slave =
4379                         reciprocal_value(packets_per_slave);
4380         } else {
4381                 /* reciprocal_packets_per_slave is unused if
4382                  * packets_per_slave is 0 or 1, just initialize it
4383                  */
4384                 params->reciprocal_packets_per_slave =
4385                         (struct reciprocal_value) { 0 };
4386         }
4387 
4388         if (primary) {
4389                 strncpy(params->primary, primary, IFNAMSIZ);
4390                 params->primary[IFNAMSIZ - 1] = 0;
4391         }
4392 
4393         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4394 
4395         return 0;
4396 }
4397 
4398 static struct lock_class_key bonding_netdev_xmit_lock_key;
4399 static struct lock_class_key bonding_netdev_addr_lock_key;
4400 static struct lock_class_key bonding_tx_busylock_key;
4401 
4402 static void bond_set_lockdep_class_one(struct net_device *dev,
4403                                        struct netdev_queue *txq,
4404                                        void *_unused)
4405 {
4406         lockdep_set_class(&txq->_xmit_lock,
4407                           &bonding_netdev_xmit_lock_key);
4408 }
4409 
4410 static void bond_set_lockdep_class(struct net_device *dev)
4411 {
4412         lockdep_set_class(&dev->addr_list_lock,
4413                           &bonding_netdev_addr_lock_key);
4414         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4415         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4416 }
4417 
4418 /* Called from registration process */
4419 static int bond_init(struct net_device *bond_dev)
4420 {
4421         struct bonding *bond = netdev_priv(bond_dev);
4422         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4423 
4424         netdev_dbg(bond_dev, "Begin bond_init\n");
4425 
4426         bond->wq = create_singlethread_workqueue(bond_dev->name);
4427         if (!bond->wq)
4428                 return -ENOMEM;
4429 
4430         bond_set_lockdep_class(bond_dev);
4431 
4432         list_add_tail(&bond->bond_list, &bn->dev_list);
4433 
4434         bond_prepare_sysfs_group(bond);
4435 
4436         bond_debug_register(bond);
4437 
4438         /* Ensure valid dev_addr */
4439         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4440             bond_dev->addr_assign_type == NET_ADDR_PERM)
4441                 eth_hw_addr_random(bond_dev);
4442 
4443         return 0;
4444 }
4445 
4446 unsigned int bond_get_num_tx_queues(void)
4447 {
4448         return tx_queues;
4449 }
4450 
4451 /* Create a new bond based on the specified name and bonding parameters.
4452  * If name is NULL, obtain a suitable "bond%d" name for us.
4453  * Caller must NOT hold rtnl_lock; we need to release it here before we
4454  * set up our sysfs entries.
4455  */
4456 int bond_create(struct net *net, const char *name)
4457 {
4458         struct net_device *bond_dev;
4459         int res;
4460 
4461         rtnl_lock();
4462 
4463         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4464                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4465                                    bond_setup, tx_queues);
4466         if (!bond_dev) {
4467                 pr_err("%s: eek! can't alloc netdev!\n", name);
4468                 rtnl_unlock();
4469                 return -ENOMEM;
4470         }
4471 
4472         dev_net_set(bond_dev, net);
4473         bond_dev->rtnl_link_ops = &bond_link_ops;
4474 
4475         res = register_netdevice(bond_dev);
4476 
4477         netif_carrier_off(bond_dev);
4478 
4479         rtnl_unlock();
4480         if (res < 0)
4481                 bond_destructor(bond_dev);
4482         return res;
4483 }
4484 
4485 static int __net_init bond_net_init(struct net *net)
4486 {
4487         struct bond_net *bn = net_generic(net, bond_net_id);
4488 
4489         bn->net = net;
4490         INIT_LIST_HEAD(&bn->dev_list);
4491 
4492         bond_create_proc_dir(bn);
4493         bond_create_sysfs(bn);
4494 
4495         return 0;
4496 }
4497 
4498 static void __net_exit bond_net_exit(struct net *net)
4499 {
4500         struct bond_net *bn = net_generic(net, bond_net_id);
4501         struct bonding *bond, *tmp_bond;
4502         LIST_HEAD(list);
4503 
4504         bond_destroy_sysfs(bn);
4505 
4506         /* Kill off any bonds created after unregistering bond rtnl ops */
4507         rtnl_lock();
4508         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4509                 unregister_netdevice_queue(bond->dev, &list);
4510         unregister_netdevice_many(&list);
4511         rtnl_unlock();
4512 
4513         bond_destroy_proc_dir(bn);
4514 }
4515 
4516 static struct pernet_operations bond_net_ops = {
4517         .init = bond_net_init,
4518         .exit = bond_net_exit,
4519         .id   = &bond_net_id,
4520         .size = sizeof(struct bond_net),
4521 };
4522 
4523 static int __init bonding_init(void)
4524 {
4525         int i;
4526         int res;
4527 
4528         pr_info("%s", bond_version);
4529 
4530         res = bond_check_params(&bonding_defaults);
4531         if (res)
4532                 goto out;
4533 
4534         res = register_pernet_subsys(&bond_net_ops);
4535         if (res)
4536                 goto out;
4537 
4538         res = bond_netlink_init();
4539         if (res)
4540                 goto err_link;
4541 
4542         bond_create_debugfs();
4543 
4544         for (i = 0; i < max_bonds; i++) {
4545                 res = bond_create(&init_net, NULL);
4546                 if (res)
4547                         goto err;
4548         }
4549 
4550         register_netdevice_notifier(&bond_netdev_notifier);
4551 out:
4552         return res;
4553 err:
4554         bond_destroy_debugfs();
4555         bond_netlink_fini();
4556 err_link:
4557         unregister_pernet_subsys(&bond_net_ops);
4558         goto out;
4559 
4560 }
4561 
4562 static void __exit bonding_exit(void)
4563 {
4564         unregister_netdevice_notifier(&bond_netdev_notifier);
4565 
4566         bond_destroy_debugfs();
4567 
4568         bond_netlink_fini();
4569         unregister_pernet_subsys(&bond_net_ops);
4570 
4571 #ifdef CONFIG_NET_POLL_CONTROLLER
4572         /* Make sure we don't have an imbalance on our netpoll blocking */
4573         WARN_ON(atomic_read(&netpoll_block_tx));
4574 #endif
4575 }
4576 
4577 module_init(bonding_init);
4578 module_exit(bonding_exit);
4579 MODULE_LICENSE("GPL");
4580 MODULE_VERSION(DRV_VERSION);
4581 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4582 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4583 

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