Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 35 
 36 #include <linux/kernel.h>
 37 #include <linux/module.h>
 38 #include <linux/types.h>
 39 #include <linux/fcntl.h>
 40 #include <linux/interrupt.h>
 41 #include <linux/ptrace.h>
 42 #include <linux/ioport.h>
 43 #include <linux/in.h>
 44 #include <net/ip.h>
 45 #include <linux/ip.h>
 46 #include <linux/tcp.h>
 47 #include <linux/udp.h>
 48 #include <linux/slab.h>
 49 #include <linux/string.h>
 50 #include <linux/init.h>
 51 #include <linux/timer.h>
 52 #include <linux/socket.h>
 53 #include <linux/ctype.h>
 54 #include <linux/inet.h>
 55 #include <linux/bitops.h>
 56 #include <linux/io.h>
 57 #include <asm/dma.h>
 58 #include <linux/uaccess.h>
 59 #include <linux/errno.h>
 60 #include <linux/netdevice.h>
 61 #include <linux/inetdevice.h>
 62 #include <linux/igmp.h>
 63 #include <linux/etherdevice.h>
 64 #include <linux/skbuff.h>
 65 #include <net/sock.h>
 66 #include <linux/rtnetlink.h>
 67 #include <linux/smp.h>
 68 #include <linux/if_ether.h>
 69 #include <net/arp.h>
 70 #include <linux/mii.h>
 71 #include <linux/ethtool.h>
 72 #include <linux/if_vlan.h>
 73 #include <linux/if_bonding.h>
 74 #include <linux/jiffies.h>
 75 #include <linux/preempt.h>
 76 #include <net/route.h>
 77 #include <net/net_namespace.h>
 78 #include <net/netns/generic.h>
 79 #include <net/pkt_sched.h>
 80 #include <linux/rculist.h>
 81 #include <net/flow_keys.h>
 82 #include "bonding.h"
 83 #include "bond_3ad.h"
 84 #include "bond_alb.h"
 85 
 86 /*---------------------------- Module parameters ----------------------------*/
 87 
 88 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
 89 
 90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 91 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 92 static int num_peer_notif = 1;
 93 static int miimon;
 94 static int updelay;
 95 static int downdelay;
 96 static int use_carrier  = 1;
 97 static char *mode;
 98 static char *primary;
 99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *arp_all_targets;
108 static char *fail_over_mac;
109 static int all_slaves_active;
110 static struct bond_params bonding_defaults;
111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112 static int packets_per_slave = 1;
113 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
114 
115 module_param(max_bonds, int, 0);
116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
117 module_param(tx_queues, int, 0);
118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
119 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
120 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
121                                "failover event (alias of num_unsol_na)");
122 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
123 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
124                                "failover event (alias of num_grat_arp)");
125 module_param(miimon, int, 0);
126 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
127 module_param(updelay, int, 0);
128 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
129 module_param(downdelay, int, 0);
130 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
131                             "in milliseconds");
132 module_param(use_carrier, int, 0);
133 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
134                               "0 for off, 1 for on (default)");
135 module_param(mode, charp, 0);
136 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
137                        "1 for active-backup, 2 for balance-xor, "
138                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
139                        "6 for balance-alb");
140 module_param(primary, charp, 0);
141 MODULE_PARM_DESC(primary, "Primary network device to use");
142 module_param(primary_reselect, charp, 0);
143 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
144                                    "once it comes up; "
145                                    "0 for always (default), "
146                                    "1 for only if speed of primary is "
147                                    "better, "
148                                    "2 for only on active slave "
149                                    "failure");
150 module_param(lacp_rate, charp, 0);
151 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
152                             "0 for slow, 1 for fast");
153 module_param(ad_select, charp, 0);
154 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
155                             "0 for stable (default), 1 for bandwidth, "
156                             "2 for count");
157 module_param(min_links, int, 0);
158 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
159 
160 module_param(xmit_hash_policy, charp, 0);
161 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
162                                    "0 for layer 2 (default), 1 for layer 3+4, "
163                                    "2 for layer 2+3, 3 for encap layer 2+3, "
164                                    "4 for encap layer 3+4");
165 module_param(arp_interval, int, 0);
166 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
167 module_param_array(arp_ip_target, charp, NULL, 0);
168 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
169 module_param(arp_validate, charp, 0);
170 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
171                                "0 for none (default), 1 for active, "
172                                "2 for backup, 3 for all");
173 module_param(arp_all_targets, charp, 0);
174 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
175 module_param(fail_over_mac, charp, 0);
176 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
177                                 "the same MAC; 0 for none (default), "
178                                 "1 for active, 2 for follow");
179 module_param(all_slaves_active, int, 0);
180 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
181                                      "by setting active flag for all slaves; "
182                                      "0 for never (default), 1 for always.");
183 module_param(resend_igmp, int, 0);
184 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
185                               "link failure");
186 module_param(packets_per_slave, int, 0);
187 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
188                                     "mode; 0 for a random slave, 1 packet per "
189                                     "slave (default), >1 packets per slave.");
190 module_param(lp_interval, uint, 0);
191 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
192                               "the bonding driver sends learning packets to "
193                               "each slaves peer switch. The default is 1.");
194 
195 /*----------------------------- Global variables ----------------------------*/
196 
197 #ifdef CONFIG_NET_POLL_CONTROLLER
198 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
199 #endif
200 
201 int bond_net_id __read_mostly;
202 
203 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
204 static int arp_ip_count;
205 static int bond_mode    = BOND_MODE_ROUNDROBIN;
206 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
207 static int lacp_fast;
208 
209 /*-------------------------- Forward declarations ---------------------------*/
210 
211 static int bond_init(struct net_device *bond_dev);
212 static void bond_uninit(struct net_device *bond_dev);
213 
214 /*---------------------------- General routines -----------------------------*/
215 
216 const char *bond_mode_name(int mode)
217 {
218         static const char *names[] = {
219                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
220                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
221                 [BOND_MODE_XOR] = "load balancing (xor)",
222                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
223                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
224                 [BOND_MODE_TLB] = "transmit load balancing",
225                 [BOND_MODE_ALB] = "adaptive load balancing",
226         };
227 
228         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
229                 return "unknown";
230 
231         return names[mode];
232 }
233 
234 /*---------------------------------- VLAN -----------------------------------*/
235 
236 /**
237  * bond_dev_queue_xmit - Prepare skb for xmit.
238  *
239  * @bond: bond device that got this skb for tx.
240  * @skb: hw accel VLAN tagged skb to transmit
241  * @slave_dev: slave that is supposed to xmit this skbuff
242  */
243 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
244                         struct net_device *slave_dev)
245 {
246         skb->dev = slave_dev;
247 
248         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
249                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
250         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
251 
252         if (unlikely(netpoll_tx_running(bond->dev)))
253                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
254         else
255                 dev_queue_xmit(skb);
256 }
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 /*
332  * Set the carrier state for the master according to the state of its
333  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
334  * do special 802.3ad magic.
335  *
336  * Returns zero if carrier state does not change, nonzero if it does.
337  */
338 static int bond_set_carrier(struct bonding *bond)
339 {
340         struct list_head *iter;
341         struct slave *slave;
342 
343         if (!bond_has_slaves(bond))
344                 goto down;
345 
346         if (bond->params.mode == BOND_MODE_8023AD)
347                 return bond_3ad_set_carrier(bond);
348 
349         bond_for_each_slave(bond, slave, iter) {
350                 if (slave->link == BOND_LINK_UP) {
351                         if (!netif_carrier_ok(bond->dev)) {
352                                 netif_carrier_on(bond->dev);
353                                 return 1;
354                         }
355                         return 0;
356                 }
357         }
358 
359 down:
360         if (netif_carrier_ok(bond->dev)) {
361                 netif_carrier_off(bond->dev);
362                 return 1;
363         }
364         return 0;
365 }
366 
367 /*
368  * Get link speed and duplex from the slave's base driver
369  * using ethtool. If for some reason the call fails or the
370  * values are invalid, set speed and duplex to -1,
371  * and return.
372  */
373 static void bond_update_speed_duplex(struct slave *slave)
374 {
375         struct net_device *slave_dev = slave->dev;
376         struct ethtool_cmd ecmd;
377         u32 slave_speed;
378         int res;
379 
380         slave->speed = SPEED_UNKNOWN;
381         slave->duplex = DUPLEX_UNKNOWN;
382 
383         res = __ethtool_get_settings(slave_dev, &ecmd);
384         if (res < 0)
385                 return;
386 
387         slave_speed = ethtool_cmd_speed(&ecmd);
388         if (slave_speed == 0 || slave_speed == ((__u32) -1))
389                 return;
390 
391         switch (ecmd.duplex) {
392         case DUPLEX_FULL:
393         case DUPLEX_HALF:
394                 break;
395         default:
396                 return;
397         }
398 
399         slave->speed = slave_speed;
400         slave->duplex = ecmd.duplex;
401 
402         return;
403 }
404 
405 const char *bond_slave_link_status(s8 link)
406 {
407         switch (link) {
408         case BOND_LINK_UP:
409                 return "up";
410         case BOND_LINK_FAIL:
411                 return "going down";
412         case BOND_LINK_DOWN:
413                 return "down";
414         case BOND_LINK_BACK:
415                 return "going back";
416         default:
417                 return "unknown";
418         }
419 }
420 
421 /*
422  * if <dev> supports MII link status reporting, check its link status.
423  *
424  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425  * depending upon the setting of the use_carrier parameter.
426  *
427  * Return either BMSR_LSTATUS, meaning that the link is up (or we
428  * can't tell and just pretend it is), or 0, meaning that the link is
429  * down.
430  *
431  * If reporting is non-zero, instead of faking link up, return -1 if
432  * both ETHTOOL and MII ioctls fail (meaning the device does not
433  * support them).  If use_carrier is set, return whatever it says.
434  * It'd be nice if there was a good way to tell if a driver supports
435  * netif_carrier, but there really isn't.
436  */
437 static int bond_check_dev_link(struct bonding *bond,
438                                struct net_device *slave_dev, int reporting)
439 {
440         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441         int (*ioctl)(struct net_device *, struct ifreq *, int);
442         struct ifreq ifr;
443         struct mii_ioctl_data *mii;
444 
445         if (!reporting && !netif_running(slave_dev))
446                 return 0;
447 
448         if (bond->params.use_carrier)
449                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
450 
451         /* Try to get link status using Ethtool first. */
452         if (slave_dev->ethtool_ops->get_link)
453                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
454                         BMSR_LSTATUS : 0;
455 
456         /* Ethtool can't be used, fallback to MII ioctls. */
457         ioctl = slave_ops->ndo_do_ioctl;
458         if (ioctl) {
459                 /* TODO: set pointer to correct ioctl on a per team member */
460                 /*       bases to make this more efficient. that is, once  */
461                 /*       we determine the correct ioctl, we will always    */
462                 /*       call it and not the others for that team          */
463                 /*       member.                                           */
464 
465                 /*
466                  * We cannot assume that SIOCGMIIPHY will also read a
467                  * register; not all network drivers (e.g., e100)
468                  * support that.
469                  */
470 
471                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
473                 mii = if_mii(&ifr);
474                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475                         mii->reg_num = MII_BMSR;
476                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
477                                 return mii->val_out & BMSR_LSTATUS;
478                 }
479         }
480 
481         /*
482          * If reporting, report that either there's no dev->do_ioctl,
483          * or both SIOCGMIIREG and get_link failed (meaning that we
484          * cannot report link status).  If not reporting, pretend
485          * we're ok.
486          */
487         return reporting ? -1 : BMSR_LSTATUS;
488 }
489 
490 /*----------------------------- Multicast list ------------------------------*/
491 
492 /*
493  * Push the promiscuity flag down to appropriate slaves
494  */
495 static int bond_set_promiscuity(struct bonding *bond, int inc)
496 {
497         struct list_head *iter;
498         int err = 0;
499 
500         if (USES_PRIMARY(bond->params.mode)) {
501                 /* write lock already acquired */
502                 if (bond->curr_active_slave) {
503                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
504                                                   inc);
505                 }
506         } else {
507                 struct slave *slave;
508 
509                 bond_for_each_slave(bond, slave, iter) {
510                         err = dev_set_promiscuity(slave->dev, inc);
511                         if (err)
512                                 return err;
513                 }
514         }
515         return err;
516 }
517 
518 /*
519  * Push the allmulti flag down to all slaves
520  */
521 static int bond_set_allmulti(struct bonding *bond, int inc)
522 {
523         struct list_head *iter;
524         int err = 0;
525 
526         if (USES_PRIMARY(bond->params.mode)) {
527                 /* write lock already acquired */
528                 if (bond->curr_active_slave) {
529                         err = dev_set_allmulti(bond->curr_active_slave->dev,
530                                                inc);
531                 }
532         } else {
533                 struct slave *slave;
534 
535                 bond_for_each_slave(bond, slave, iter) {
536                         err = dev_set_allmulti(slave->dev, inc);
537                         if (err)
538                                 return err;
539                 }
540         }
541         return err;
542 }
543 
544 /*
545  * Retrieve the list of registered multicast addresses for the bonding
546  * device and retransmit an IGMP JOIN request to the current active
547  * slave.
548  */
549 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
550 {
551         struct bonding *bond = container_of(work, struct bonding,
552                                             mcast_work.work);
553 
554         if (!rtnl_trylock()) {
555                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
556                 return;
557         }
558         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
559 
560         if (bond->igmp_retrans > 1) {
561                 bond->igmp_retrans--;
562                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
563         }
564         rtnl_unlock();
565 }
566 
567 /* Flush bond's hardware addresses from slave
568  */
569 static void bond_hw_addr_flush(struct net_device *bond_dev,
570                                struct net_device *slave_dev)
571 {
572         struct bonding *bond = netdev_priv(bond_dev);
573 
574         dev_uc_unsync(slave_dev, bond_dev);
575         dev_mc_unsync(slave_dev, bond_dev);
576 
577         if (bond->params.mode == BOND_MODE_8023AD) {
578                 /* del lacpdu mc addr from mc list */
579                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
580 
581                 dev_mc_del(slave_dev, lacpdu_multicast);
582         }
583 }
584 
585 /*--------------------------- Active slave change ---------------------------*/
586 
587 /* Update the hardware address list and promisc/allmulti for the new and
588  * old active slaves (if any).  Modes that are !USES_PRIMARY keep all
589  * slaves up date at all times; only the USES_PRIMARY modes need to call
590  * this function to swap these settings during a failover.
591  */
592 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
593                               struct slave *old_active)
594 {
595         ASSERT_RTNL();
596 
597         if (old_active) {
598                 if (bond->dev->flags & IFF_PROMISC)
599                         dev_set_promiscuity(old_active->dev, -1);
600 
601                 if (bond->dev->flags & IFF_ALLMULTI)
602                         dev_set_allmulti(old_active->dev, -1);
603 
604                 bond_hw_addr_flush(bond->dev, old_active->dev);
605         }
606 
607         if (new_active) {
608                 /* FIXME: Signal errors upstream. */
609                 if (bond->dev->flags & IFF_PROMISC)
610                         dev_set_promiscuity(new_active->dev, 1);
611 
612                 if (bond->dev->flags & IFF_ALLMULTI)
613                         dev_set_allmulti(new_active->dev, 1);
614 
615                 netif_addr_lock_bh(bond->dev);
616                 dev_uc_sync(new_active->dev, bond->dev);
617                 dev_mc_sync(new_active->dev, bond->dev);
618                 netif_addr_unlock_bh(bond->dev);
619         }
620 }
621 
622 /**
623  * bond_set_dev_addr - clone slave's address to bond
624  * @bond_dev: bond net device
625  * @slave_dev: slave net device
626  *
627  * Should be called with RTNL held.
628  */
629 static void bond_set_dev_addr(struct net_device *bond_dev,
630                               struct net_device *slave_dev)
631 {
632         pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
633                  bond_dev, slave_dev, slave_dev->addr_len);
634         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
635         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
636         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
637 }
638 
639 /*
640  * bond_do_fail_over_mac
641  *
642  * Perform special MAC address swapping for fail_over_mac settings
643  *
644  * Called with RTNL, curr_slave_lock for write_bh.
645  */
646 static void bond_do_fail_over_mac(struct bonding *bond,
647                                   struct slave *new_active,
648                                   struct slave *old_active)
649         __releases(&bond->curr_slave_lock)
650         __acquires(&bond->curr_slave_lock)
651 {
652         u8 tmp_mac[ETH_ALEN];
653         struct sockaddr saddr;
654         int rv;
655 
656         switch (bond->params.fail_over_mac) {
657         case BOND_FOM_ACTIVE:
658                 if (new_active) {
659                         write_unlock_bh(&bond->curr_slave_lock);
660                         bond_set_dev_addr(bond->dev, new_active->dev);
661                         write_lock_bh(&bond->curr_slave_lock);
662                 }
663                 break;
664         case BOND_FOM_FOLLOW:
665                 /*
666                  * if new_active && old_active, swap them
667                  * if just old_active, do nothing (going to no active slave)
668                  * if just new_active, set new_active to bond's MAC
669                  */
670                 if (!new_active)
671                         return;
672 
673                 write_unlock_bh(&bond->curr_slave_lock);
674 
675                 if (old_active) {
676                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677                         ether_addr_copy(saddr.sa_data,
678                                         old_active->dev->dev_addr);
679                         saddr.sa_family = new_active->dev->type;
680                 } else {
681                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682                         saddr.sa_family = bond->dev->type;
683                 }
684 
685                 rv = dev_set_mac_address(new_active->dev, &saddr);
686                 if (rv) {
687                         pr_err("%s: Error %d setting MAC of slave %s\n",
688                                bond->dev->name, -rv, new_active->dev->name);
689                         goto out;
690                 }
691 
692                 if (!old_active)
693                         goto out;
694 
695                 ether_addr_copy(saddr.sa_data, tmp_mac);
696                 saddr.sa_family = old_active->dev->type;
697 
698                 rv = dev_set_mac_address(old_active->dev, &saddr);
699                 if (rv)
700                         pr_err("%s: Error %d setting MAC of slave %s\n",
701                                bond->dev->name, -rv, new_active->dev->name);
702 out:
703                 write_lock_bh(&bond->curr_slave_lock);
704                 break;
705         default:
706                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
707                        bond->dev->name, bond->params.fail_over_mac);
708                 break;
709         }
710 
711 }
712 
713 static bool bond_should_change_active(struct bonding *bond)
714 {
715         struct slave *prim = bond->primary_slave;
716         struct slave *curr = bond->curr_active_slave;
717 
718         if (!prim || !curr || curr->link != BOND_LINK_UP)
719                 return true;
720         if (bond->force_primary) {
721                 bond->force_primary = false;
722                 return true;
723         }
724         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
725             (prim->speed < curr->speed ||
726              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
727                 return false;
728         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
729                 return false;
730         return true;
731 }
732 
733 /**
734  * find_best_interface - select the best available slave to be the active one
735  * @bond: our bonding struct
736  */
737 static struct slave *bond_find_best_slave(struct bonding *bond)
738 {
739         struct slave *slave, *bestslave = NULL;
740         struct list_head *iter;
741         int mintime = bond->params.updelay;
742 
743         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
744             bond_should_change_active(bond))
745                 return bond->primary_slave;
746 
747         bond_for_each_slave(bond, slave, iter) {
748                 if (slave->link == BOND_LINK_UP)
749                         return slave;
750                 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
751                     slave->delay < mintime) {
752                         mintime = slave->delay;
753                         bestslave = slave;
754                 }
755         }
756 
757         return bestslave;
758 }
759 
760 static bool bond_should_notify_peers(struct bonding *bond)
761 {
762         struct slave *slave;
763 
764         rcu_read_lock();
765         slave = rcu_dereference(bond->curr_active_slave);
766         rcu_read_unlock();
767 
768         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
769                  bond->dev->name, slave ? slave->dev->name : "NULL");
770 
771         if (!slave || !bond->send_peer_notif ||
772             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
773                 return false;
774 
775         return true;
776 }
777 
778 /**
779  * change_active_interface - change the active slave into the specified one
780  * @bond: our bonding struct
781  * @new: the new slave to make the active one
782  *
783  * Set the new slave to the bond's settings and unset them on the old
784  * curr_active_slave.
785  * Setting include flags, mc-list, promiscuity, allmulti, etc.
786  *
787  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
788  * because it is apparently the best available slave we have, even though its
789  * updelay hasn't timed out yet.
790  *
791  * If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
792  */
793 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
794 {
795         struct slave *old_active = bond->curr_active_slave;
796 
797         if (old_active == new_active)
798                 return;
799 
800         if (new_active) {
801                 new_active->last_link_up = jiffies;
802 
803                 if (new_active->link == BOND_LINK_BACK) {
804                         if (USES_PRIMARY(bond->params.mode)) {
805                                 pr_info("%s: making interface %s the new active one %d ms earlier\n",
806                                         bond->dev->name, new_active->dev->name,
807                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
808                         }
809 
810                         new_active->delay = 0;
811                         new_active->link = BOND_LINK_UP;
812 
813                         if (bond->params.mode == BOND_MODE_8023AD)
814                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
815 
816                         if (bond_is_lb(bond))
817                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
818                 } else {
819                         if (USES_PRIMARY(bond->params.mode)) {
820                                 pr_info("%s: making interface %s the new active one\n",
821                                         bond->dev->name, new_active->dev->name);
822                         }
823                 }
824         }
825 
826         if (USES_PRIMARY(bond->params.mode))
827                 bond_hw_addr_swap(bond, new_active, old_active);
828 
829         if (bond_is_lb(bond)) {
830                 bond_alb_handle_active_change(bond, new_active);
831                 if (old_active)
832                         bond_set_slave_inactive_flags(old_active,
833                                                       BOND_SLAVE_NOTIFY_NOW);
834                 if (new_active)
835                         bond_set_slave_active_flags(new_active,
836                                                     BOND_SLAVE_NOTIFY_NOW);
837         } else {
838                 rcu_assign_pointer(bond->curr_active_slave, new_active);
839         }
840 
841         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
842                 if (old_active)
843                         bond_set_slave_inactive_flags(old_active,
844                                                       BOND_SLAVE_NOTIFY_NOW);
845 
846                 if (new_active) {
847                         bool should_notify_peers = false;
848 
849                         bond_set_slave_active_flags(new_active,
850                                                     BOND_SLAVE_NOTIFY_NOW);
851 
852                         if (bond->params.fail_over_mac)
853                                 bond_do_fail_over_mac(bond, new_active,
854                                                       old_active);
855 
856                         if (netif_running(bond->dev)) {
857                                 bond->send_peer_notif =
858                                         bond->params.num_peer_notif;
859                                 should_notify_peers =
860                                         bond_should_notify_peers(bond);
861                         }
862 
863                         write_unlock_bh(&bond->curr_slave_lock);
864 
865                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
866                         if (should_notify_peers)
867                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
868                                                          bond->dev);
869 
870                         write_lock_bh(&bond->curr_slave_lock);
871                 }
872         }
873 
874         /* resend IGMP joins since active slave has changed or
875          * all were sent on curr_active_slave.
876          * resend only if bond is brought up with the affected
877          * bonding modes and the retransmission is enabled */
878         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
879             ((USES_PRIMARY(bond->params.mode) && new_active) ||
880              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
881                 bond->igmp_retrans = bond->params.resend_igmp;
882                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
883         }
884 }
885 
886 /**
887  * bond_select_active_slave - select a new active slave, if needed
888  * @bond: our bonding struct
889  *
890  * This functions should be called when one of the following occurs:
891  * - The old curr_active_slave has been released or lost its link.
892  * - The primary_slave has got its link back.
893  * - A slave has got its link back and there's no old curr_active_slave.
894  *
895  * Caller must hold curr_slave_lock for write_bh.
896  */
897 void bond_select_active_slave(struct bonding *bond)
898 {
899         struct slave *best_slave;
900         int rv;
901 
902         best_slave = bond_find_best_slave(bond);
903         if (best_slave != bond->curr_active_slave) {
904                 bond_change_active_slave(bond, best_slave);
905                 rv = bond_set_carrier(bond);
906                 if (!rv)
907                         return;
908 
909                 if (netif_carrier_ok(bond->dev)) {
910                         pr_info("%s: first active interface up!\n",
911                                 bond->dev->name);
912                 } else {
913                         pr_info("%s: now running without any active interface!\n",
914                                 bond->dev->name);
915                 }
916         }
917 }
918 
919 #ifdef CONFIG_NET_POLL_CONTROLLER
920 static inline int slave_enable_netpoll(struct slave *slave)
921 {
922         struct netpoll *np;
923         int err = 0;
924 
925         np = kzalloc(sizeof(*np), GFP_KERNEL);
926         err = -ENOMEM;
927         if (!np)
928                 goto out;
929 
930         err = __netpoll_setup(np, slave->dev);
931         if (err) {
932                 kfree(np);
933                 goto out;
934         }
935         slave->np = np;
936 out:
937         return err;
938 }
939 static inline void slave_disable_netpoll(struct slave *slave)
940 {
941         struct netpoll *np = slave->np;
942 
943         if (!np)
944                 return;
945 
946         slave->np = NULL;
947         __netpoll_free_async(np);
948 }
949 
950 static void bond_poll_controller(struct net_device *bond_dev)
951 {
952 }
953 
954 static void bond_netpoll_cleanup(struct net_device *bond_dev)
955 {
956         struct bonding *bond = netdev_priv(bond_dev);
957         struct list_head *iter;
958         struct slave *slave;
959 
960         bond_for_each_slave(bond, slave, iter)
961                 if (IS_UP(slave->dev))
962                         slave_disable_netpoll(slave);
963 }
964 
965 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
966 {
967         struct bonding *bond = netdev_priv(dev);
968         struct list_head *iter;
969         struct slave *slave;
970         int err = 0;
971 
972         bond_for_each_slave(bond, slave, iter) {
973                 err = slave_enable_netpoll(slave);
974                 if (err) {
975                         bond_netpoll_cleanup(dev);
976                         break;
977                 }
978         }
979         return err;
980 }
981 #else
982 static inline int slave_enable_netpoll(struct slave *slave)
983 {
984         return 0;
985 }
986 static inline void slave_disable_netpoll(struct slave *slave)
987 {
988 }
989 static void bond_netpoll_cleanup(struct net_device *bond_dev)
990 {
991 }
992 #endif
993 
994 /*---------------------------------- IOCTL ----------------------------------*/
995 
996 static netdev_features_t bond_fix_features(struct net_device *dev,
997                                            netdev_features_t features)
998 {
999         struct bonding *bond = netdev_priv(dev);
1000         struct list_head *iter;
1001         netdev_features_t mask;
1002         struct slave *slave;
1003 
1004         if (!bond_has_slaves(bond)) {
1005                 /* Disable adding VLANs to empty bond. But why? --mq */
1006                 features |= NETIF_F_VLAN_CHALLENGED;
1007                 return features;
1008         }
1009 
1010         mask = features;
1011         features &= ~NETIF_F_ONE_FOR_ALL;
1012         features |= NETIF_F_ALL_FOR_ALL;
1013 
1014         bond_for_each_slave(bond, slave, iter) {
1015                 features = netdev_increment_features(features,
1016                                                      slave->dev->features,
1017                                                      mask);
1018         }
1019         features = netdev_add_tso_features(features, mask);
1020 
1021         return features;
1022 }
1023 
1024 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1025                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1026                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1027 
1028 static void bond_compute_features(struct bonding *bond)
1029 {
1030         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1031         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1032         struct net_device *bond_dev = bond->dev;
1033         struct list_head *iter;
1034         struct slave *slave;
1035         unsigned short max_hard_header_len = ETH_HLEN;
1036         unsigned int gso_max_size = GSO_MAX_SIZE;
1037         u16 gso_max_segs = GSO_MAX_SEGS;
1038 
1039         if (!bond_has_slaves(bond))
1040                 goto done;
1041 
1042         bond_for_each_slave(bond, slave, iter) {
1043                 vlan_features = netdev_increment_features(vlan_features,
1044                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1045 
1046                 dst_release_flag &= slave->dev->priv_flags;
1047                 if (slave->dev->hard_header_len > max_hard_header_len)
1048                         max_hard_header_len = slave->dev->hard_header_len;
1049 
1050                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1051                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1052         }
1053 
1054 done:
1055         bond_dev->vlan_features = vlan_features;
1056         bond_dev->hard_header_len = max_hard_header_len;
1057         bond_dev->gso_max_segs = gso_max_segs;
1058         netif_set_gso_max_size(bond_dev, gso_max_size);
1059 
1060         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1061         bond_dev->priv_flags = flags | dst_release_flag;
1062 
1063         netdev_change_features(bond_dev);
1064 }
1065 
1066 static void bond_setup_by_slave(struct net_device *bond_dev,
1067                                 struct net_device *slave_dev)
1068 {
1069         bond_dev->header_ops        = slave_dev->header_ops;
1070 
1071         bond_dev->type              = slave_dev->type;
1072         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1073         bond_dev->addr_len          = slave_dev->addr_len;
1074 
1075         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1076                 slave_dev->addr_len);
1077 }
1078 
1079 /* On bonding slaves other than the currently active slave, suppress
1080  * duplicates except for alb non-mcast/bcast.
1081  */
1082 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1083                                             struct slave *slave,
1084                                             struct bonding *bond)
1085 {
1086         if (bond_is_slave_inactive(slave)) {
1087                 if (bond->params.mode == BOND_MODE_ALB &&
1088                     skb->pkt_type != PACKET_BROADCAST &&
1089                     skb->pkt_type != PACKET_MULTICAST)
1090                         return false;
1091                 return true;
1092         }
1093         return false;
1094 }
1095 
1096 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1097 {
1098         struct sk_buff *skb = *pskb;
1099         struct slave *slave;
1100         struct bonding *bond;
1101         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1102                           struct slave *);
1103         int ret = RX_HANDLER_ANOTHER;
1104 
1105         skb = skb_share_check(skb, GFP_ATOMIC);
1106         if (unlikely(!skb))
1107                 return RX_HANDLER_CONSUMED;
1108 
1109         *pskb = skb;
1110 
1111         slave = bond_slave_get_rcu(skb->dev);
1112         bond = slave->bond;
1113 
1114         recv_probe = ACCESS_ONCE(bond->recv_probe);
1115         if (recv_probe) {
1116                 ret = recv_probe(skb, bond, slave);
1117                 if (ret == RX_HANDLER_CONSUMED) {
1118                         consume_skb(skb);
1119                         return ret;
1120                 }
1121         }
1122 
1123         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1124                 return RX_HANDLER_EXACT;
1125         }
1126 
1127         skb->dev = bond->dev;
1128 
1129         if (bond->params.mode == BOND_MODE_ALB &&
1130             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1131             skb->pkt_type == PACKET_HOST) {
1132 
1133                 if (unlikely(skb_cow_head(skb,
1134                                           skb->data - skb_mac_header(skb)))) {
1135                         kfree_skb(skb);
1136                         return RX_HANDLER_CONSUMED;
1137                 }
1138                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1139         }
1140 
1141         return ret;
1142 }
1143 
1144 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1145                                       struct net_device *slave_dev,
1146                                       struct slave *slave)
1147 {
1148         int err;
1149 
1150         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1151         if (err)
1152                 return err;
1153         slave_dev->flags |= IFF_SLAVE;
1154         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1155         return 0;
1156 }
1157 
1158 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1159                                   struct net_device *slave_dev)
1160 {
1161         netdev_upper_dev_unlink(slave_dev, bond_dev);
1162         slave_dev->flags &= ~IFF_SLAVE;
1163         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1164 }
1165 
1166 /* enslave device <slave> to bond device <master> */
1167 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1168 {
1169         struct bonding *bond = netdev_priv(bond_dev);
1170         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1171         struct slave *new_slave = NULL, *prev_slave;
1172         struct sockaddr addr;
1173         int link_reporting;
1174         int res = 0, i;
1175 
1176         if (!bond->params.use_carrier &&
1177             slave_dev->ethtool_ops->get_link == NULL &&
1178             slave_ops->ndo_do_ioctl == NULL) {
1179                 pr_warn("%s: Warning: no link monitoring support for %s\n",
1180                         bond_dev->name, slave_dev->name);
1181         }
1182 
1183         /* already enslaved */
1184         if (slave_dev->flags & IFF_SLAVE) {
1185                 pr_debug("Error: Device was already enslaved\n");
1186                 return -EBUSY;
1187         }
1188 
1189         if (bond_dev == slave_dev) {
1190                 pr_err("%s: cannot enslave bond to itself.\n", bond_dev->name);
1191                 return -EPERM;
1192         }
1193 
1194         /* vlan challenged mutual exclusion */
1195         /* no need to lock since we're protected by rtnl_lock */
1196         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1197                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1198                 if (vlan_uses_dev(bond_dev)) {
1199                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1200                                bond_dev->name, slave_dev->name, bond_dev->name);
1201                         return -EPERM;
1202                 } else {
1203                         pr_warn("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1204                                 bond_dev->name, slave_dev->name,
1205                                 slave_dev->name, bond_dev->name);
1206                 }
1207         } else {
1208                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1209         }
1210 
1211         /*
1212          * Old ifenslave binaries are no longer supported.  These can
1213          * be identified with moderate accuracy by the state of the slave:
1214          * the current ifenslave will set the interface down prior to
1215          * enslaving it; the old ifenslave will not.
1216          */
1217         if ((slave_dev->flags & IFF_UP)) {
1218                 pr_err("%s is up - this may be due to an out of date ifenslave\n",
1219                        slave_dev->name);
1220                 res = -EPERM;
1221                 goto err_undo_flags;
1222         }
1223 
1224         /* set bonding device ether type by slave - bonding netdevices are
1225          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1226          * there is a need to override some of the type dependent attribs/funcs.
1227          *
1228          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1229          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1230          */
1231         if (!bond_has_slaves(bond)) {
1232                 if (bond_dev->type != slave_dev->type) {
1233                         pr_debug("%s: change device type from %d to %d\n",
1234                                  bond_dev->name,
1235                                  bond_dev->type, slave_dev->type);
1236 
1237                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1238                                                        bond_dev);
1239                         res = notifier_to_errno(res);
1240                         if (res) {
1241                                 pr_err("%s: refused to change device type\n",
1242                                        bond_dev->name);
1243                                 res = -EBUSY;
1244                                 goto err_undo_flags;
1245                         }
1246 
1247                         /* Flush unicast and multicast addresses */
1248                         dev_uc_flush(bond_dev);
1249                         dev_mc_flush(bond_dev);
1250 
1251                         if (slave_dev->type != ARPHRD_ETHER)
1252                                 bond_setup_by_slave(bond_dev, slave_dev);
1253                         else {
1254                                 ether_setup(bond_dev);
1255                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1256                         }
1257 
1258                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1259                                                  bond_dev);
1260                 }
1261         } else if (bond_dev->type != slave_dev->type) {
1262                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1263                        slave_dev->name, slave_dev->type, bond_dev->type);
1264                 res = -EINVAL;
1265                 goto err_undo_flags;
1266         }
1267 
1268         if (slave_ops->ndo_set_mac_address == NULL) {
1269                 if (!bond_has_slaves(bond)) {
1270                         pr_warn("%s: Warning: The first slave device specified does not support setting the MAC address\n",
1271                                 bond_dev->name);
1272                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1273                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1274                                 pr_warn("%s: Setting fail_over_mac to active for active-backup mode\n",
1275                                         bond_dev->name);
1276                         }
1277                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1278                         pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n",
1279                                bond_dev->name);
1280                         res = -EOPNOTSUPP;
1281                         goto err_undo_flags;
1282                 }
1283         }
1284 
1285         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1286 
1287         /* If this is the first slave, then we need to set the master's hardware
1288          * address to be the same as the slave's. */
1289         if (!bond_has_slaves(bond) &&
1290             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1291                 bond_set_dev_addr(bond->dev, slave_dev);
1292 
1293         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1294         if (!new_slave) {
1295                 res = -ENOMEM;
1296                 goto err_undo_flags;
1297         }
1298         /*
1299          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1300          * is set via sysfs or module option if desired.
1301          */
1302         new_slave->queue_id = 0;
1303 
1304         /* Save slave's original mtu and then set it to match the bond */
1305         new_slave->original_mtu = slave_dev->mtu;
1306         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1307         if (res) {
1308                 pr_debug("Error %d calling dev_set_mtu\n", res);
1309                 goto err_free;
1310         }
1311 
1312         /*
1313          * Save slave's original ("permanent") mac address for modes
1314          * that need it, and for restoring it upon release, and then
1315          * set it to the master's address
1316          */
1317         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1318 
1319         if (!bond->params.fail_over_mac ||
1320             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1321                 /*
1322                  * Set slave to master's mac address.  The application already
1323                  * set the master's mac address to that of the first slave
1324                  */
1325                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1326                 addr.sa_family = slave_dev->type;
1327                 res = dev_set_mac_address(slave_dev, &addr);
1328                 if (res) {
1329                         pr_debug("Error %d calling set_mac_address\n", res);
1330                         goto err_restore_mtu;
1331                 }
1332         }
1333 
1334         /* open the slave since the application closed it */
1335         res = dev_open(slave_dev);
1336         if (res) {
1337                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1338                 goto err_restore_mac;
1339         }
1340 
1341         new_slave->bond = bond;
1342         new_slave->dev = slave_dev;
1343         slave_dev->priv_flags |= IFF_BONDING;
1344 
1345         if (bond_is_lb(bond)) {
1346                 /* bond_alb_init_slave() must be called before all other stages since
1347                  * it might fail and we do not want to have to undo everything
1348                  */
1349                 res = bond_alb_init_slave(bond, new_slave);
1350                 if (res)
1351                         goto err_close;
1352         }
1353 
1354         /* If the mode USES_PRIMARY, then the following is handled by
1355          * bond_change_active_slave().
1356          */
1357         if (!USES_PRIMARY(bond->params.mode)) {
1358                 /* set promiscuity level to new slave */
1359                 if (bond_dev->flags & IFF_PROMISC) {
1360                         res = dev_set_promiscuity(slave_dev, 1);
1361                         if (res)
1362                                 goto err_close;
1363                 }
1364 
1365                 /* set allmulti level to new slave */
1366                 if (bond_dev->flags & IFF_ALLMULTI) {
1367                         res = dev_set_allmulti(slave_dev, 1);
1368                         if (res)
1369                                 goto err_close;
1370                 }
1371 
1372                 netif_addr_lock_bh(bond_dev);
1373 
1374                 dev_mc_sync_multiple(slave_dev, bond_dev);
1375                 dev_uc_sync_multiple(slave_dev, bond_dev);
1376 
1377                 netif_addr_unlock_bh(bond_dev);
1378         }
1379 
1380         if (bond->params.mode == BOND_MODE_8023AD) {
1381                 /* add lacpdu mc addr to mc list */
1382                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1383 
1384                 dev_mc_add(slave_dev, lacpdu_multicast);
1385         }
1386 
1387         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1388         if (res) {
1389                 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1390                        bond_dev->name, slave_dev->name);
1391                 goto err_close;
1392         }
1393 
1394         prev_slave = bond_last_slave(bond);
1395 
1396         new_slave->delay = 0;
1397         new_slave->link_failure_count = 0;
1398 
1399         bond_update_speed_duplex(new_slave);
1400 
1401         new_slave->last_rx = jiffies -
1402                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1403         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1404                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1405 
1406         if (bond->params.miimon && !bond->params.use_carrier) {
1407                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1408 
1409                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1410                         /*
1411                          * miimon is set but a bonded network driver
1412                          * does not support ETHTOOL/MII and
1413                          * arp_interval is not set.  Note: if
1414                          * use_carrier is enabled, we will never go
1415                          * here (because netif_carrier is always
1416                          * supported); thus, we don't need to change
1417                          * the messages for netif_carrier.
1418                          */
1419                         pr_warn("%s: Warning: 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",
1420                                 bond_dev->name, slave_dev->name);
1421                 } else if (link_reporting == -1) {
1422                         /* unable get link status using mii/ethtool */
1423                         pr_warn("%s: Warning: 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",
1424                                 bond_dev->name, slave_dev->name);
1425                 }
1426         }
1427 
1428         /* check for initial state */
1429         if (bond->params.miimon) {
1430                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1431                         if (bond->params.updelay) {
1432                                 new_slave->link = BOND_LINK_BACK;
1433                                 new_slave->delay = bond->params.updelay;
1434                         } else {
1435                                 new_slave->link = BOND_LINK_UP;
1436                         }
1437                 } else {
1438                         new_slave->link = BOND_LINK_DOWN;
1439                 }
1440         } else if (bond->params.arp_interval) {
1441                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1442                         BOND_LINK_UP : BOND_LINK_DOWN);
1443         } else {
1444                 new_slave->link = BOND_LINK_UP;
1445         }
1446 
1447         if (new_slave->link != BOND_LINK_DOWN)
1448                 new_slave->last_link_up = jiffies;
1449         pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1450                  new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1451                  (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1452 
1453         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1454                 /* if there is a primary slave, remember it */
1455                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1456                         bond->primary_slave = new_slave;
1457                         bond->force_primary = true;
1458                 }
1459         }
1460 
1461         switch (bond->params.mode) {
1462         case BOND_MODE_ACTIVEBACKUP:
1463                 bond_set_slave_inactive_flags(new_slave,
1464                                               BOND_SLAVE_NOTIFY_NOW);
1465                 break;
1466         case BOND_MODE_8023AD:
1467                 /* in 802.3ad mode, the internal mechanism
1468                  * will activate the slaves in the selected
1469                  * aggregator
1470                  */
1471                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1472                 /* if this is the first slave */
1473                 if (!prev_slave) {
1474                         SLAVE_AD_INFO(new_slave).id = 1;
1475                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1476                          * can be called only after the mac address of the bond is set
1477                          */
1478                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1479                 } else {
1480                         SLAVE_AD_INFO(new_slave).id =
1481                                 SLAVE_AD_INFO(prev_slave).id + 1;
1482                 }
1483 
1484                 bond_3ad_bind_slave(new_slave);
1485                 break;
1486         case BOND_MODE_TLB:
1487         case BOND_MODE_ALB:
1488                 bond_set_active_slave(new_slave);
1489                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1490                 break;
1491         default:
1492                 pr_debug("This slave is always active in trunk mode\n");
1493 
1494                 /* always active in trunk mode */
1495                 bond_set_active_slave(new_slave);
1496 
1497                 /* In trunking mode there is little meaning to curr_active_slave
1498                  * anyway (it holds no special properties of the bond device),
1499                  * so we can change it without calling change_active_interface()
1500                  */
1501                 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1502                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1503 
1504                 break;
1505         } /* switch(bond_mode) */
1506 
1507 #ifdef CONFIG_NET_POLL_CONTROLLER
1508         slave_dev->npinfo = bond->dev->npinfo;
1509         if (slave_dev->npinfo) {
1510                 if (slave_enable_netpoll(new_slave)) {
1511                         pr_info("Error, %s: master_dev is using netpoll, but new slave device does not support netpoll\n",
1512                                 bond_dev->name);
1513                         res = -EBUSY;
1514                         goto err_detach;
1515                 }
1516         }
1517 #endif
1518 
1519         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1520                                          new_slave);
1521         if (res) {
1522                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1523                 goto err_detach;
1524         }
1525 
1526         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1527         if (res) {
1528                 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1529                 goto err_unregister;
1530         }
1531 
1532         res = bond_sysfs_slave_add(new_slave);
1533         if (res) {
1534                 pr_debug("Error %d calling bond_sysfs_slave_add\n", res);
1535                 goto err_upper_unlink;
1536         }
1537 
1538         bond->slave_cnt++;
1539         bond_compute_features(bond);
1540         bond_set_carrier(bond);
1541 
1542         if (USES_PRIMARY(bond->params.mode)) {
1543                 block_netpoll_tx();
1544                 write_lock_bh(&bond->curr_slave_lock);
1545                 bond_select_active_slave(bond);
1546                 write_unlock_bh(&bond->curr_slave_lock);
1547                 unblock_netpoll_tx();
1548         }
1549 
1550         pr_info("%s: Enslaving %s as %s interface with %s link\n",
1551                 bond_dev->name, slave_dev->name,
1552                 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1553                 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1554 
1555         /* enslave is successful */
1556         return 0;
1557 
1558 /* Undo stages on error */
1559 err_upper_unlink:
1560         bond_upper_dev_unlink(bond_dev, slave_dev);
1561 
1562 err_unregister:
1563         netdev_rx_handler_unregister(slave_dev);
1564 
1565 err_detach:
1566         if (!USES_PRIMARY(bond->params.mode))
1567                 bond_hw_addr_flush(bond_dev, slave_dev);
1568 
1569         vlan_vids_del_by_dev(slave_dev, bond_dev);
1570         if (bond->primary_slave == new_slave)
1571                 bond->primary_slave = NULL;
1572         if (bond->curr_active_slave == new_slave) {
1573                 block_netpoll_tx();
1574                 write_lock_bh(&bond->curr_slave_lock);
1575                 bond_change_active_slave(bond, NULL);
1576                 bond_select_active_slave(bond);
1577                 write_unlock_bh(&bond->curr_slave_lock);
1578                 unblock_netpoll_tx();
1579         }
1580         slave_disable_netpoll(new_slave);
1581 
1582 err_close:
1583         slave_dev->priv_flags &= ~IFF_BONDING;
1584         dev_close(slave_dev);
1585 
1586 err_restore_mac:
1587         if (!bond->params.fail_over_mac ||
1588             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1589                 /* XXX TODO - fom follow mode needs to change master's
1590                  * MAC if this slave's MAC is in use by the bond, or at
1591                  * least print a warning.
1592                  */
1593                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1594                 addr.sa_family = slave_dev->type;
1595                 dev_set_mac_address(slave_dev, &addr);
1596         }
1597 
1598 err_restore_mtu:
1599         dev_set_mtu(slave_dev, new_slave->original_mtu);
1600 
1601 err_free:
1602         kfree(new_slave);
1603 
1604 err_undo_flags:
1605         /* Enslave of first slave has failed and we need to fix master's mac */
1606         if (!bond_has_slaves(bond) &&
1607             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1608                 eth_hw_addr_random(bond_dev);
1609 
1610         return res;
1611 }
1612 
1613 /*
1614  * Try to release the slave device <slave> from the bond device <master>
1615  * It is legal to access curr_active_slave without a lock because all the function
1616  * is write-locked. If "all" is true it means that the function is being called
1617  * while destroying a bond interface and all slaves are being released.
1618  *
1619  * The rules for slave state should be:
1620  *   for Active/Backup:
1621  *     Active stays on all backups go down
1622  *   for Bonded connections:
1623  *     The first up interface should be left on and all others downed.
1624  */
1625 static int __bond_release_one(struct net_device *bond_dev,
1626                               struct net_device *slave_dev,
1627                               bool all)
1628 {
1629         struct bonding *bond = netdev_priv(bond_dev);
1630         struct slave *slave, *oldcurrent;
1631         struct sockaddr addr;
1632         int old_flags = bond_dev->flags;
1633         netdev_features_t old_features = bond_dev->features;
1634 
1635         /* slave is not a slave or master is not master of this slave */
1636         if (!(slave_dev->flags & IFF_SLAVE) ||
1637             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1638                 pr_err("%s: Error: cannot release %s\n",
1639                        bond_dev->name, slave_dev->name);
1640                 return -EINVAL;
1641         }
1642 
1643         block_netpoll_tx();
1644 
1645         slave = bond_get_slave_by_dev(bond, slave_dev);
1646         if (!slave) {
1647                 /* not a slave of this bond */
1648                 pr_info("%s: %s not enslaved\n",
1649                         bond_dev->name, slave_dev->name);
1650                 unblock_netpoll_tx();
1651                 return -EINVAL;
1652         }
1653 
1654         bond_sysfs_slave_del(slave);
1655 
1656         bond_upper_dev_unlink(bond_dev, slave_dev);
1657         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1658          * for this slave anymore.
1659          */
1660         netdev_rx_handler_unregister(slave_dev);
1661         write_lock_bh(&bond->lock);
1662 
1663         /* Inform AD package of unbinding of slave. */
1664         if (bond->params.mode == BOND_MODE_8023AD)
1665                 bond_3ad_unbind_slave(slave);
1666 
1667         write_unlock_bh(&bond->lock);
1668 
1669         pr_info("%s: Releasing %s interface %s\n",
1670                 bond_dev->name,
1671                 bond_is_active_slave(slave) ? "active" : "backup",
1672                 slave_dev->name);
1673 
1674         oldcurrent = bond->curr_active_slave;
1675 
1676         bond->current_arp_slave = NULL;
1677 
1678         if (!all && (!bond->params.fail_over_mac ||
1679                      bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
1680                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1681                     bond_has_slaves(bond))
1682                         pr_warn("%s: Warning: 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",
1683                                 bond_dev->name, slave_dev->name,
1684                                 slave->perm_hwaddr,
1685                                 bond_dev->name, slave_dev->name);
1686         }
1687 
1688         if (bond->primary_slave == slave)
1689                 bond->primary_slave = NULL;
1690 
1691         if (oldcurrent == slave) {
1692                 write_lock_bh(&bond->curr_slave_lock);
1693                 bond_change_active_slave(bond, NULL);
1694                 write_unlock_bh(&bond->curr_slave_lock);
1695         }
1696 
1697         if (bond_is_lb(bond)) {
1698                 /* Must be called only after the slave has been
1699                  * detached from the list and the curr_active_slave
1700                  * has been cleared (if our_slave == old_current),
1701                  * but before a new active slave is selected.
1702                  */
1703                 bond_alb_deinit_slave(bond, slave);
1704         }
1705 
1706         if (all) {
1707                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1708         } else if (oldcurrent == slave) {
1709                 /*
1710                  * Note that we hold RTNL over this sequence, so there
1711                  * is no concern that another slave add/remove event
1712                  * will interfere.
1713                  */
1714                 write_lock_bh(&bond->curr_slave_lock);
1715 
1716                 bond_select_active_slave(bond);
1717 
1718                 write_unlock_bh(&bond->curr_slave_lock);
1719         }
1720 
1721         if (!bond_has_slaves(bond)) {
1722                 bond_set_carrier(bond);
1723                 eth_hw_addr_random(bond_dev);
1724 
1725                 if (vlan_uses_dev(bond_dev)) {
1726                         pr_warn("%s: Warning: clearing HW address of %s while it still has VLANs\n",
1727                                 bond_dev->name, bond_dev->name);
1728                         pr_warn("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs\n",
1729                                 bond_dev->name);
1730                 }
1731         }
1732 
1733         unblock_netpoll_tx();
1734         synchronize_rcu();
1735         bond->slave_cnt--;
1736 
1737         if (!bond_has_slaves(bond)) {
1738                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1739                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1740         }
1741 
1742         bond_compute_features(bond);
1743         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1744             (old_features & NETIF_F_VLAN_CHALLENGED))
1745                 pr_info("%s: last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1746                         bond_dev->name, slave_dev->name, bond_dev->name);
1747 
1748         /* must do this from outside any spinlocks */
1749         vlan_vids_del_by_dev(slave_dev, bond_dev);
1750 
1751         /* If the mode USES_PRIMARY, then this cases was handled above by
1752          * bond_change_active_slave(..., NULL)
1753          */
1754         if (!USES_PRIMARY(bond->params.mode)) {
1755                 /* unset promiscuity level from slave
1756                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1757                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1758                  * value of that flag before that change, as that was the value
1759                  * when this slave was attached, so we cache at the start of the
1760                  * function and use it here. Same goes for ALLMULTI below
1761                  */
1762                 if (old_flags & IFF_PROMISC)
1763                         dev_set_promiscuity(slave_dev, -1);
1764 
1765                 /* unset allmulti level from slave */
1766                 if (old_flags & IFF_ALLMULTI)
1767                         dev_set_allmulti(slave_dev, -1);
1768 
1769                 bond_hw_addr_flush(bond_dev, slave_dev);
1770         }
1771 
1772         slave_disable_netpoll(slave);
1773 
1774         /* close slave before restoring its mac address */
1775         dev_close(slave_dev);
1776 
1777         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1778             bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1779                 /* restore original ("permanent") mac address */
1780                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1781                 addr.sa_family = slave_dev->type;
1782                 dev_set_mac_address(slave_dev, &addr);
1783         }
1784 
1785         dev_set_mtu(slave_dev, slave->original_mtu);
1786 
1787         slave_dev->priv_flags &= ~IFF_BONDING;
1788 
1789         kfree(slave);
1790 
1791         return 0;  /* deletion OK */
1792 }
1793 
1794 /* A wrapper used because of ndo_del_link */
1795 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1796 {
1797         return __bond_release_one(bond_dev, slave_dev, false);
1798 }
1799 
1800 /*
1801 * First release a slave and then destroy the bond if no more slaves are left.
1802 * Must be under rtnl_lock when this function is called.
1803 */
1804 static int  bond_release_and_destroy(struct net_device *bond_dev,
1805                                      struct net_device *slave_dev)
1806 {
1807         struct bonding *bond = netdev_priv(bond_dev);
1808         int ret;
1809 
1810         ret = bond_release(bond_dev, slave_dev);
1811         if (ret == 0 && !bond_has_slaves(bond)) {
1812                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1813                 pr_info("%s: Destroying bond %s\n",
1814                         bond_dev->name, bond_dev->name);
1815                 unregister_netdevice(bond_dev);
1816         }
1817         return ret;
1818 }
1819 
1820 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1821 {
1822         struct bonding *bond = netdev_priv(bond_dev);
1823 
1824         info->bond_mode = bond->params.mode;
1825         info->miimon = bond->params.miimon;
1826 
1827         info->num_slaves = bond->slave_cnt;
1828 
1829         return 0;
1830 }
1831 
1832 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1833 {
1834         struct bonding *bond = netdev_priv(bond_dev);
1835         struct list_head *iter;
1836         int i = 0, res = -ENODEV;
1837         struct slave *slave;
1838 
1839         bond_for_each_slave(bond, slave, iter) {
1840                 if (i++ == (int)info->slave_id) {
1841                         res = 0;
1842                         strcpy(info->slave_name, slave->dev->name);
1843                         info->link = slave->link;
1844                         info->state = bond_slave_state(slave);
1845                         info->link_failure_count = slave->link_failure_count;
1846                         break;
1847                 }
1848         }
1849 
1850         return res;
1851 }
1852 
1853 /*-------------------------------- Monitoring -------------------------------*/
1854 
1855 
1856 static int bond_miimon_inspect(struct bonding *bond)
1857 {
1858         int link_state, commit = 0;
1859         struct list_head *iter;
1860         struct slave *slave;
1861         bool ignore_updelay;
1862 
1863         ignore_updelay = !bond->curr_active_slave ? true : false;
1864 
1865         bond_for_each_slave_rcu(bond, slave, iter) {
1866                 slave->new_link = BOND_LINK_NOCHANGE;
1867 
1868                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1869 
1870                 switch (slave->link) {
1871                 case BOND_LINK_UP:
1872                         if (link_state)
1873                                 continue;
1874 
1875                         slave->link = BOND_LINK_FAIL;
1876                         slave->delay = bond->params.downdelay;
1877                         if (slave->delay) {
1878                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms\n",
1879                                         bond->dev->name,
1880                                         (bond->params.mode ==
1881                                          BOND_MODE_ACTIVEBACKUP) ?
1882                                         (bond_is_active_slave(slave) ?
1883                                          "active " : "backup ") : "",
1884                                         slave->dev->name,
1885                                         bond->params.downdelay * bond->params.miimon);
1886                         }
1887                         /*FALLTHRU*/
1888                 case BOND_LINK_FAIL:
1889                         if (link_state) {
1890                                 /*
1891                                  * recovered before downdelay expired
1892                                  */
1893                                 slave->link = BOND_LINK_UP;
1894                                 slave->last_link_up = jiffies;
1895                                 pr_info("%s: link status up again after %d ms for interface %s\n",
1896                                         bond->dev->name,
1897                                         (bond->params.downdelay - slave->delay) *
1898                                         bond->params.miimon,
1899                                         slave->dev->name);
1900                                 continue;
1901                         }
1902 
1903                         if (slave->delay <= 0) {
1904                                 slave->new_link = BOND_LINK_DOWN;
1905                                 commit++;
1906                                 continue;
1907                         }
1908 
1909                         slave->delay--;
1910                         break;
1911 
1912                 case BOND_LINK_DOWN:
1913                         if (!link_state)
1914                                 continue;
1915 
1916                         slave->link = BOND_LINK_BACK;
1917                         slave->delay = bond->params.updelay;
1918 
1919                         if (slave->delay) {
1920                                 pr_info("%s: link status up for interface %s, enabling it in %d ms\n",
1921                                         bond->dev->name, slave->dev->name,
1922                                         ignore_updelay ? 0 :
1923                                         bond->params.updelay *
1924                                         bond->params.miimon);
1925                         }
1926                         /*FALLTHRU*/
1927                 case BOND_LINK_BACK:
1928                         if (!link_state) {
1929                                 slave->link = BOND_LINK_DOWN;
1930                                 pr_info("%s: link status down again after %d ms for interface %s\n",
1931                                         bond->dev->name,
1932                                         (bond->params.updelay - slave->delay) *
1933                                         bond->params.miimon,
1934                                         slave->dev->name);
1935 
1936                                 continue;
1937                         }
1938 
1939                         if (ignore_updelay)
1940                                 slave->delay = 0;
1941 
1942                         if (slave->delay <= 0) {
1943                                 slave->new_link = BOND_LINK_UP;
1944                                 commit++;
1945                                 ignore_updelay = false;
1946                                 continue;
1947                         }
1948 
1949                         slave->delay--;
1950                         break;
1951                 }
1952         }
1953 
1954         return commit;
1955 }
1956 
1957 static void bond_miimon_commit(struct bonding *bond)
1958 {
1959         struct list_head *iter;
1960         struct slave *slave;
1961 
1962         bond_for_each_slave(bond, slave, iter) {
1963                 switch (slave->new_link) {
1964                 case BOND_LINK_NOCHANGE:
1965                         continue;
1966 
1967                 case BOND_LINK_UP:
1968                         slave->link = BOND_LINK_UP;
1969                         slave->last_link_up = jiffies;
1970 
1971                         if (bond->params.mode == BOND_MODE_8023AD) {
1972                                 /* prevent it from being the active one */
1973                                 bond_set_backup_slave(slave);
1974                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
1975                                 /* make it immediately active */
1976                                 bond_set_active_slave(slave);
1977                         } else if (slave != bond->primary_slave) {
1978                                 /* prevent it from being the active one */
1979                                 bond_set_backup_slave(slave);
1980                         }
1981 
1982                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex\n",
1983                                 bond->dev->name, slave->dev->name,
1984                                 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
1985                                 slave->duplex ? "full" : "half");
1986 
1987                         /* notify ad that the link status has changed */
1988                         if (bond->params.mode == BOND_MODE_8023AD)
1989                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
1990 
1991                         if (bond_is_lb(bond))
1992                                 bond_alb_handle_link_change(bond, slave,
1993                                                             BOND_LINK_UP);
1994 
1995                         if (!bond->curr_active_slave ||
1996                             (slave == bond->primary_slave))
1997                                 goto do_failover;
1998 
1999                         continue;
2000 
2001                 case BOND_LINK_DOWN:
2002                         if (slave->link_failure_count < UINT_MAX)
2003                                 slave->link_failure_count++;
2004 
2005                         slave->link = BOND_LINK_DOWN;
2006 
2007                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2008                             bond->params.mode == BOND_MODE_8023AD)
2009                                 bond_set_slave_inactive_flags(slave,
2010                                                               BOND_SLAVE_NOTIFY_NOW);
2011 
2012                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2013                                 bond->dev->name, slave->dev->name);
2014 
2015                         if (bond->params.mode == BOND_MODE_8023AD)
2016                                 bond_3ad_handle_link_change(slave,
2017                                                             BOND_LINK_DOWN);
2018 
2019                         if (bond_is_lb(bond))
2020                                 bond_alb_handle_link_change(bond, slave,
2021                                                             BOND_LINK_DOWN);
2022 
2023                         if (slave == bond->curr_active_slave)
2024                                 goto do_failover;
2025 
2026                         continue;
2027 
2028                 default:
2029                         pr_err("%s: invalid new link %d on slave %s\n",
2030                                bond->dev->name, slave->new_link,
2031                                slave->dev->name);
2032                         slave->new_link = BOND_LINK_NOCHANGE;
2033 
2034                         continue;
2035                 }
2036 
2037 do_failover:
2038                 ASSERT_RTNL();
2039                 block_netpoll_tx();
2040                 write_lock_bh(&bond->curr_slave_lock);
2041                 bond_select_active_slave(bond);
2042                 write_unlock_bh(&bond->curr_slave_lock);
2043                 unblock_netpoll_tx();
2044         }
2045 
2046         bond_set_carrier(bond);
2047 }
2048 
2049 /*
2050  * bond_mii_monitor
2051  *
2052  * Really a wrapper that splits the mii monitor into two phases: an
2053  * inspection, then (if inspection indicates something needs to be done)
2054  * an acquisition of appropriate locks followed by a commit phase to
2055  * implement whatever link state changes are indicated.
2056  */
2057 static void bond_mii_monitor(struct work_struct *work)
2058 {
2059         struct bonding *bond = container_of(work, struct bonding,
2060                                             mii_work.work);
2061         bool should_notify_peers = false;
2062         unsigned long delay;
2063 
2064         delay = msecs_to_jiffies(bond->params.miimon);
2065 
2066         if (!bond_has_slaves(bond))
2067                 goto re_arm;
2068 
2069         rcu_read_lock();
2070 
2071         should_notify_peers = bond_should_notify_peers(bond);
2072 
2073         if (bond_miimon_inspect(bond)) {
2074                 rcu_read_unlock();
2075 
2076                 /* Race avoidance with bond_close cancel of workqueue */
2077                 if (!rtnl_trylock()) {
2078                         delay = 1;
2079                         should_notify_peers = false;
2080                         goto re_arm;
2081                 }
2082 
2083                 bond_miimon_commit(bond);
2084 
2085                 rtnl_unlock();  /* might sleep, hold no other locks */
2086         } else
2087                 rcu_read_unlock();
2088 
2089 re_arm:
2090         if (bond->params.miimon)
2091                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2092 
2093         if (should_notify_peers) {
2094                 if (!rtnl_trylock())
2095                         return;
2096                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2097                 rtnl_unlock();
2098         }
2099 }
2100 
2101 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2102 {
2103         struct net_device *upper;
2104         struct list_head *iter;
2105         bool ret = false;
2106 
2107         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2108                 return true;
2109 
2110         rcu_read_lock();
2111         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2112                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2113                         ret = true;
2114                         break;
2115                 }
2116         }
2117         rcu_read_unlock();
2118 
2119         return ret;
2120 }
2121 
2122 /*
2123  * We go to the (large) trouble of VLAN tagging ARP frames because
2124  * switches in VLAN mode (especially if ports are configured as
2125  * "native" to a VLAN) might not pass non-tagged frames.
2126  */
2127 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2128                           __be32 dest_ip, __be32 src_ip,
2129                           struct bond_vlan_tag *tags)
2130 {
2131         struct sk_buff *skb;
2132         int i;
2133 
2134         pr_debug("arp %d on slave %s: dst %pI4 src %pI4\n",
2135                  arp_op, slave_dev->name, &dest_ip, &src_ip);
2136 
2137         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2138                          NULL, slave_dev->dev_addr, NULL);
2139 
2140         if (!skb) {
2141                 net_err_ratelimited("ARP packet allocation failed\n");
2142                 return;
2143         }
2144 
2145         /* Go through all the tags backwards and add them to the packet */
2146         for (i = BOND_MAX_VLAN_ENCAP - 1; i > 0; i--) {
2147                 if (!tags[i].vlan_id)
2148                         continue;
2149 
2150                 pr_debug("inner tag: proto %X vid %X\n",
2151                          ntohs(tags[i].vlan_proto), tags[i].vlan_id);
2152                 skb = __vlan_put_tag(skb, tags[i].vlan_proto,
2153                                      tags[i].vlan_id);
2154                 if (!skb) {
2155                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2156                         return;
2157                 }
2158         }
2159         /* Set the outer tag */
2160         if (tags[0].vlan_id) {
2161                 pr_debug("outer tag: proto %X vid %X\n",
2162                          ntohs(tags[0].vlan_proto), tags[0].vlan_id);
2163                 skb = vlan_put_tag(skb, tags[0].vlan_proto, tags[0].vlan_id);
2164                 if (!skb) {
2165                         net_err_ratelimited("failed to insert outer VLAN tag\n");
2166                         return;
2167                 }
2168         }
2169         arp_xmit(skb);
2170 }
2171 
2172 /* Validate the device path between the @start_dev and the @end_dev.
2173  * The path is valid if the @end_dev is reachable through device
2174  * stacking.
2175  * When the path is validated, collect any vlan information in the
2176  * path.
2177  */
2178 static bool bond_verify_device_path(struct net_device *start_dev,
2179                                     struct net_device *end_dev,
2180                                     struct bond_vlan_tag *tags)
2181 {
2182         struct net_device *upper;
2183         struct list_head  *iter;
2184         int  idx;
2185 
2186         if (start_dev == end_dev)
2187                 return true;
2188 
2189         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2190                 if (bond_verify_device_path(upper, end_dev, tags)) {
2191                         if (is_vlan_dev(upper)) {
2192                                 idx = vlan_get_encap_level(upper);
2193                                 if (idx >= BOND_MAX_VLAN_ENCAP)
2194                                         return false;
2195 
2196                                 tags[idx].vlan_proto =
2197                                                     vlan_dev_vlan_proto(upper);
2198                                 tags[idx].vlan_id = vlan_dev_vlan_id(upper);
2199                         }
2200                         return true;
2201                 }
2202         }
2203 
2204         return false;
2205 }
2206 
2207 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2208 {
2209         struct rtable *rt;
2210         struct bond_vlan_tag tags[BOND_MAX_VLAN_ENCAP];
2211         __be32 *targets = bond->params.arp_targets, addr;
2212         int i;
2213         bool ret;
2214 
2215         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2216                 pr_debug("basa: target %pI4\n", &targets[i]);
2217                 memset(tags, 0, sizeof(tags));
2218 
2219                 /* Find out through which dev should the packet go */
2220                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2221                                      RTO_ONLINK, 0);
2222                 if (IS_ERR(rt)) {
2223                         /* there's no route to target - try to send arp
2224                          * probe to generate any traffic (arp_validate=0)
2225                          */
2226                         if (bond->params.arp_validate)
2227                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2228                                                      bond->dev->name,
2229                                                      &targets[i]);
2230                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2231                                       0, tags);
2232                         continue;
2233                 }
2234 
2235                 /* bond device itself */
2236                 if (rt->dst.dev == bond->dev)
2237                         goto found;
2238 
2239                 rcu_read_lock();
2240                 ret = bond_verify_device_path(bond->dev, rt->dst.dev, tags);
2241                 rcu_read_unlock();
2242 
2243                 if (ret)
2244                         goto found;
2245 
2246                 /* Not our device - skip */
2247                 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2248                          bond->dev->name, &targets[i],
2249                          rt->dst.dev ? rt->dst.dev->name : "NULL");
2250 
2251                 ip_rt_put(rt);
2252                 continue;
2253 
2254 found:
2255                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2256                 ip_rt_put(rt);
2257                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2258                               addr, tags);
2259         }
2260 }
2261 
2262 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2263 {
2264         int i;
2265 
2266         if (!sip || !bond_has_this_ip(bond, tip)) {
2267                 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2268                 return;
2269         }
2270 
2271         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2272         if (i == -1) {
2273                 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2274                 return;
2275         }
2276         slave->last_rx = jiffies;
2277         slave->target_last_arp_rx[i] = jiffies;
2278 }
2279 
2280 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2281                  struct slave *slave)
2282 {
2283         struct arphdr *arp = (struct arphdr *)skb->data;
2284         struct slave *curr_active_slave;
2285         unsigned char *arp_ptr;
2286         __be32 sip, tip;
2287         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2288 
2289         if (!slave_do_arp_validate(bond, slave)) {
2290                 if ((slave_do_arp_validate_only(bond, slave) && is_arp) ||
2291                     !slave_do_arp_validate_only(bond, slave))
2292                         slave->last_rx = jiffies;
2293                 return RX_HANDLER_ANOTHER;
2294         } else if (!is_arp) {
2295                 return RX_HANDLER_ANOTHER;
2296         }
2297 
2298         alen = arp_hdr_len(bond->dev);
2299 
2300         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2301                  bond->dev->name, skb->dev->name);
2302 
2303         if (alen > skb_headlen(skb)) {
2304                 arp = kmalloc(alen, GFP_ATOMIC);
2305                 if (!arp)
2306                         goto out_unlock;
2307                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2308                         goto out_unlock;
2309         }
2310 
2311         if (arp->ar_hln != bond->dev->addr_len ||
2312             skb->pkt_type == PACKET_OTHERHOST ||
2313             skb->pkt_type == PACKET_LOOPBACK ||
2314             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2315             arp->ar_pro != htons(ETH_P_IP) ||
2316             arp->ar_pln != 4)
2317                 goto out_unlock;
2318 
2319         arp_ptr = (unsigned char *)(arp + 1);
2320         arp_ptr += bond->dev->addr_len;
2321         memcpy(&sip, arp_ptr, 4);
2322         arp_ptr += 4 + bond->dev->addr_len;
2323         memcpy(&tip, arp_ptr, 4);
2324 
2325         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2326                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2327                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2328                  &sip, &tip);
2329 
2330         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2331 
2332         /*
2333          * Backup slaves won't see the ARP reply, but do come through
2334          * here for each ARP probe (so we swap the sip/tip to validate
2335          * the probe).  In a "redundant switch, common router" type of
2336          * configuration, the ARP probe will (hopefully) travel from
2337          * the active, through one switch, the router, then the other
2338          * switch before reaching the backup.
2339          *
2340          * We 'trust' the arp requests if there is an active slave and
2341          * it received valid arp reply(s) after it became active. This
2342          * is done to avoid endless looping when we can't reach the
2343          * arp_ip_target and fool ourselves with our own arp requests.
2344          */
2345 
2346         if (bond_is_active_slave(slave))
2347                 bond_validate_arp(bond, slave, sip, tip);
2348         else if (curr_active_slave &&
2349                  time_after(slave_last_rx(bond, curr_active_slave),
2350                             curr_active_slave->last_link_up))
2351                 bond_validate_arp(bond, slave, tip, sip);
2352 
2353 out_unlock:
2354         if (arp != (struct arphdr *)skb->data)
2355                 kfree(arp);
2356         return RX_HANDLER_ANOTHER;
2357 }
2358 
2359 /* function to verify if we're in the arp_interval timeslice, returns true if
2360  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2361  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2362  */
2363 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2364                                   int mod)
2365 {
2366         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2367 
2368         return time_in_range(jiffies,
2369                              last_act - delta_in_ticks,
2370                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2371 }
2372 
2373 /*
2374  * this function is called regularly to monitor each slave's link
2375  * ensuring that traffic is being sent and received when arp monitoring
2376  * is used in load-balancing mode. if the adapter has been dormant, then an
2377  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2378  * arp monitoring in active backup mode.
2379  */
2380 static void bond_loadbalance_arp_mon(struct work_struct *work)
2381 {
2382         struct bonding *bond = container_of(work, struct bonding,
2383                                             arp_work.work);
2384         struct slave *slave, *oldcurrent;
2385         struct list_head *iter;
2386         int do_failover = 0, slave_state_changed = 0;
2387 
2388         if (!bond_has_slaves(bond))
2389                 goto re_arm;
2390 
2391         rcu_read_lock();
2392 
2393         oldcurrent = ACCESS_ONCE(bond->curr_active_slave);
2394         /* see if any of the previous devices are up now (i.e. they have
2395          * xmt and rcv traffic). the curr_active_slave does not come into
2396          * the picture unless it is null. also, slave->last_link_up is not
2397          * needed here because we send an arp on each slave and give a slave
2398          * as long as it needs to get the tx/rx within the delta.
2399          * TODO: what about up/down delay in arp mode? it wasn't here before
2400          *       so it can wait
2401          */
2402         bond_for_each_slave_rcu(bond, slave, iter) {
2403                 unsigned long trans_start = dev_trans_start(slave->dev);
2404 
2405                 if (slave->link != BOND_LINK_UP) {
2406                         if (bond_time_in_interval(bond, trans_start, 1) &&
2407                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2408 
2409                                 slave->link  = BOND_LINK_UP;
2410                                 slave_state_changed = 1;
2411 
2412                                 /* primary_slave has no meaning in round-robin
2413                                  * mode. the window of a slave being up and
2414                                  * curr_active_slave being null after enslaving
2415                                  * is closed.
2416                                  */
2417                                 if (!oldcurrent) {
2418                                         pr_info("%s: link status definitely up for interface %s\n",
2419                                                 bond->dev->name,
2420                                                 slave->dev->name);
2421                                         do_failover = 1;
2422                                 } else {
2423                                         pr_info("%s: interface %s is now up\n",
2424                                                 bond->dev->name,
2425                                                 slave->dev->name);
2426                                 }
2427                         }
2428                 } else {
2429                         /* slave->link == BOND_LINK_UP */
2430 
2431                         /* not all switches will respond to an arp request
2432                          * when the source ip is 0, so don't take the link down
2433                          * if we don't know our ip yet
2434                          */
2435                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2436                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2437 
2438                                 slave->link  = BOND_LINK_DOWN;
2439                                 slave_state_changed = 1;
2440 
2441                                 if (slave->link_failure_count < UINT_MAX)
2442                                         slave->link_failure_count++;
2443 
2444                                 pr_info("%s: interface %s is now down\n",
2445                                         bond->dev->name, slave->dev->name);
2446 
2447                                 if (slave == oldcurrent)
2448                                         do_failover = 1;
2449                         }
2450                 }
2451 
2452                 /* note: if switch is in round-robin mode, all links
2453                  * must tx arp to ensure all links rx an arp - otherwise
2454                  * links may oscillate or not come up at all; if switch is
2455                  * in something like xor mode, there is nothing we can
2456                  * do - all replies will be rx'ed on same link causing slaves
2457                  * to be unstable during low/no traffic periods
2458                  */
2459                 if (IS_UP(slave->dev))
2460                         bond_arp_send_all(bond, slave);
2461         }
2462 
2463         rcu_read_unlock();
2464 
2465         if (do_failover || slave_state_changed) {
2466                 if (!rtnl_trylock())
2467                         goto re_arm;
2468 
2469                 if (slave_state_changed) {
2470                         bond_slave_state_change(bond);
2471                 } else if (do_failover) {
2472                         /* the bond_select_active_slave must hold RTNL
2473                          * and curr_slave_lock for write.
2474                          */
2475                         block_netpoll_tx();
2476                         write_lock_bh(&bond->curr_slave_lock);
2477 
2478                         bond_select_active_slave(bond);
2479 
2480                         write_unlock_bh(&bond->curr_slave_lock);
2481                         unblock_netpoll_tx();
2482                 }
2483                 rtnl_unlock();
2484         }
2485 
2486 re_arm:
2487         if (bond->params.arp_interval)
2488                 queue_delayed_work(bond->wq, &bond->arp_work,
2489                                    msecs_to_jiffies(bond->params.arp_interval));
2490 }
2491 
2492 /*
2493  * Called to inspect slaves for active-backup mode ARP monitor link state
2494  * changes.  Sets new_link in slaves to specify what action should take
2495  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2496  * to link states must be committed.
2497  *
2498  * Called with rcu_read_lock hold.
2499  */
2500 static int bond_ab_arp_inspect(struct bonding *bond)
2501 {
2502         unsigned long trans_start, last_rx;
2503         struct list_head *iter;
2504         struct slave *slave;
2505         int commit = 0;
2506 
2507         bond_for_each_slave_rcu(bond, slave, iter) {
2508                 slave->new_link = BOND_LINK_NOCHANGE;
2509                 last_rx = slave_last_rx(bond, slave);
2510 
2511                 if (slave->link != BOND_LINK_UP) {
2512                         if (bond_time_in_interval(bond, last_rx, 1)) {
2513                                 slave->new_link = BOND_LINK_UP;
2514                                 commit++;
2515                         }
2516                         continue;
2517                 }
2518 
2519                 /*
2520                  * Give slaves 2*delta after being enslaved or made
2521                  * active.  This avoids bouncing, as the last receive
2522                  * times need a full ARP monitor cycle to be updated.
2523                  */
2524                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2525                         continue;
2526 
2527                 /*
2528                  * Backup slave is down if:
2529                  * - No current_arp_slave AND
2530                  * - more than 3*delta since last receive AND
2531                  * - the bond has an IP address
2532                  *
2533                  * Note: a non-null current_arp_slave indicates
2534                  * the curr_active_slave went down and we are
2535                  * searching for a new one; under this condition
2536                  * we only take the curr_active_slave down - this
2537                  * gives each slave a chance to tx/rx traffic
2538                  * before being taken out
2539                  */
2540                 if (!bond_is_active_slave(slave) &&
2541                     !bond->current_arp_slave &&
2542                     !bond_time_in_interval(bond, last_rx, 3)) {
2543                         slave->new_link = BOND_LINK_DOWN;
2544                         commit++;
2545                 }
2546 
2547                 /*
2548                  * Active slave is down if:
2549                  * - more than 2*delta since transmitting OR
2550                  * - (more than 2*delta since receive AND
2551                  *    the bond has an IP address)
2552                  */
2553                 trans_start = dev_trans_start(slave->dev);
2554                 if (bond_is_active_slave(slave) &&
2555                     (!bond_time_in_interval(bond, trans_start, 2) ||
2556                      !bond_time_in_interval(bond, last_rx, 2))) {
2557                         slave->new_link = BOND_LINK_DOWN;
2558                         commit++;
2559                 }
2560         }
2561 
2562         return commit;
2563 }
2564 
2565 /*
2566  * Called to commit link state changes noted by inspection step of
2567  * active-backup mode ARP monitor.
2568  *
2569  * Called with RTNL hold.
2570  */
2571 static void bond_ab_arp_commit(struct bonding *bond)
2572 {
2573         unsigned long trans_start;
2574         struct list_head *iter;
2575         struct slave *slave;
2576 
2577         bond_for_each_slave(bond, slave, iter) {
2578                 switch (slave->new_link) {
2579                 case BOND_LINK_NOCHANGE:
2580                         continue;
2581 
2582                 case BOND_LINK_UP:
2583                         trans_start = dev_trans_start(slave->dev);
2584                         if (bond->curr_active_slave != slave ||
2585                             (!bond->curr_active_slave &&
2586                              bond_time_in_interval(bond, trans_start, 1))) {
2587                                 slave->link = BOND_LINK_UP;
2588                                 if (bond->current_arp_slave) {
2589                                         bond_set_slave_inactive_flags(
2590                                                 bond->current_arp_slave,
2591                                                 BOND_SLAVE_NOTIFY_NOW);
2592                                         bond->current_arp_slave = NULL;
2593                                 }
2594 
2595                                 pr_info("%s: link status definitely up for interface %s\n",
2596                                         bond->dev->name, slave->dev->name);
2597 
2598                                 if (!bond->curr_active_slave ||
2599                                     (slave == bond->primary_slave))
2600                                         goto do_failover;
2601 
2602                         }
2603 
2604                         continue;
2605 
2606                 case BOND_LINK_DOWN:
2607                         if (slave->link_failure_count < UINT_MAX)
2608                                 slave->link_failure_count++;
2609 
2610                         slave->link = BOND_LINK_DOWN;
2611                         bond_set_slave_inactive_flags(slave,
2612                                                       BOND_SLAVE_NOTIFY_NOW);
2613 
2614                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2615                                 bond->dev->name, slave->dev->name);
2616 
2617                         if (slave == bond->curr_active_slave) {
2618                                 bond->current_arp_slave = NULL;
2619                                 goto do_failover;
2620                         }
2621 
2622                         continue;
2623 
2624                 default:
2625                         pr_err("%s: impossible: new_link %d on slave %s\n",
2626                                bond->dev->name, slave->new_link,
2627                                slave->dev->name);
2628                         continue;
2629                 }
2630 
2631 do_failover:
2632                 ASSERT_RTNL();
2633                 block_netpoll_tx();
2634                 write_lock_bh(&bond->curr_slave_lock);
2635                 bond_select_active_slave(bond);
2636                 write_unlock_bh(&bond->curr_slave_lock);
2637                 unblock_netpoll_tx();
2638         }
2639 
2640         bond_set_carrier(bond);
2641 }
2642 
2643 /*
2644  * Send ARP probes for active-backup mode ARP monitor.
2645  *
2646  * Called with rcu_read_lock hold.
2647  */
2648 static bool bond_ab_arp_probe(struct bonding *bond)
2649 {
2650         struct slave *slave, *before = NULL, *new_slave = NULL,
2651                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2652                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2653         struct list_head *iter;
2654         bool found = false;
2655         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2656 
2657         if (curr_arp_slave && curr_active_slave)
2658                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2659                         curr_arp_slave->dev->name,
2660                         curr_active_slave->dev->name);
2661 
2662         if (curr_active_slave) {
2663                 bond_arp_send_all(bond, curr_active_slave);
2664                 return should_notify_rtnl;
2665         }
2666 
2667         /* if we don't have a curr_active_slave, search for the next available
2668          * backup slave from the current_arp_slave and make it the candidate
2669          * for becoming the curr_active_slave
2670          */
2671 
2672         if (!curr_arp_slave) {
2673                 curr_arp_slave = bond_first_slave_rcu(bond);
2674                 if (!curr_arp_slave)
2675                         return should_notify_rtnl;
2676         }
2677 
2678         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2679 
2680         bond_for_each_slave_rcu(bond, slave, iter) {
2681                 if (!found && !before && IS_UP(slave->dev))
2682                         before = slave;
2683 
2684                 if (found && !new_slave && IS_UP(slave->dev))
2685                         new_slave = slave;
2686                 /* if the link state is up at this point, we
2687                  * mark it down - this can happen if we have
2688                  * simultaneous link failures and
2689                  * reselect_active_interface doesn't make this
2690                  * one the current slave so it is still marked
2691                  * up when it is actually down
2692                  */
2693                 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2694                         slave->link = BOND_LINK_DOWN;
2695                         if (slave->link_failure_count < UINT_MAX)
2696                                 slave->link_failure_count++;
2697 
2698                         bond_set_slave_inactive_flags(slave,
2699                                                       BOND_SLAVE_NOTIFY_LATER);
2700 
2701                         pr_info("%s: backup interface %s is now down\n",
2702                                 bond->dev->name, slave->dev->name);
2703                 }
2704                 if (slave == curr_arp_slave)
2705                         found = true;
2706         }
2707 
2708         if (!new_slave && before)
2709                 new_slave = before;
2710 
2711         if (!new_slave)
2712                 goto check_state;
2713 
2714         new_slave->link = BOND_LINK_BACK;
2715         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2716         bond_arp_send_all(bond, new_slave);
2717         new_slave->last_link_up = jiffies;
2718         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2719 
2720 check_state:
2721         bond_for_each_slave_rcu(bond, slave, iter) {
2722                 if (slave->should_notify) {
2723                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2724                         break;
2725                 }
2726         }
2727         return should_notify_rtnl;
2728 }
2729 
2730 static void bond_activebackup_arp_mon(struct work_struct *work)
2731 {
2732         struct bonding *bond = container_of(work, struct bonding,
2733                                             arp_work.work);
2734         bool should_notify_peers = false;
2735         bool should_notify_rtnl = false;
2736         int delta_in_ticks;
2737 
2738         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2739 
2740         if (!bond_has_slaves(bond))
2741                 goto re_arm;
2742 
2743         rcu_read_lock();
2744 
2745         should_notify_peers = bond_should_notify_peers(bond);
2746 
2747         if (bond_ab_arp_inspect(bond)) {
2748                 rcu_read_unlock();
2749 
2750                 /* Race avoidance with bond_close flush of workqueue */
2751                 if (!rtnl_trylock()) {
2752                         delta_in_ticks = 1;
2753                         should_notify_peers = false;
2754                         goto re_arm;
2755                 }
2756 
2757                 bond_ab_arp_commit(bond);
2758 
2759                 rtnl_unlock();
2760                 rcu_read_lock();
2761         }
2762 
2763         should_notify_rtnl = bond_ab_arp_probe(bond);
2764         rcu_read_unlock();
2765 
2766 re_arm:
2767         if (bond->params.arp_interval)
2768                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2769 
2770         if (should_notify_peers || should_notify_rtnl) {
2771                 if (!rtnl_trylock())
2772                         return;
2773 
2774                 if (should_notify_peers)
2775                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2776                                                  bond->dev);
2777                 if (should_notify_rtnl)
2778                         bond_slave_state_notify(bond);
2779 
2780                 rtnl_unlock();
2781         }
2782 }
2783 
2784 /*-------------------------- netdev event handling --------------------------*/
2785 
2786 /*
2787  * Change device name
2788  */
2789 static int bond_event_changename(struct bonding *bond)
2790 {
2791         bond_remove_proc_entry(bond);
2792         bond_create_proc_entry(bond);
2793 
2794         bond_debug_reregister(bond);
2795 
2796         return NOTIFY_DONE;
2797 }
2798 
2799 static int bond_master_netdev_event(unsigned long event,
2800                                     struct net_device *bond_dev)
2801 {
2802         struct bonding *event_bond = netdev_priv(bond_dev);
2803 
2804         switch (event) {
2805         case NETDEV_CHANGENAME:
2806                 return bond_event_changename(event_bond);
2807         case NETDEV_UNREGISTER:
2808                 bond_remove_proc_entry(event_bond);
2809                 break;
2810         case NETDEV_REGISTER:
2811                 bond_create_proc_entry(event_bond);
2812                 break;
2813         case NETDEV_NOTIFY_PEERS:
2814                 if (event_bond->send_peer_notif)
2815                         event_bond->send_peer_notif--;
2816                 break;
2817         default:
2818                 break;
2819         }
2820 
2821         return NOTIFY_DONE;
2822 }
2823 
2824 static int bond_slave_netdev_event(unsigned long event,
2825                                    struct net_device *slave_dev)
2826 {
2827         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2828         struct bonding *bond;
2829         struct net_device *bond_dev;
2830         u32 old_speed;
2831         u8 old_duplex;
2832 
2833         /* A netdev event can be generated while enslaving a device
2834          * before netdev_rx_handler_register is called in which case
2835          * slave will be NULL
2836          */
2837         if (!slave)
2838                 return NOTIFY_DONE;
2839         bond_dev = slave->bond->dev;
2840         bond = slave->bond;
2841 
2842         switch (event) {
2843         case NETDEV_UNREGISTER:
2844                 if (bond_dev->type != ARPHRD_ETHER)
2845                         bond_release_and_destroy(bond_dev, slave_dev);
2846                 else
2847                         bond_release(bond_dev, slave_dev);
2848                 break;
2849         case NETDEV_UP:
2850         case NETDEV_CHANGE:
2851                 old_speed = slave->speed;
2852                 old_duplex = slave->duplex;
2853 
2854                 bond_update_speed_duplex(slave);
2855 
2856                 if (bond->params.mode == BOND_MODE_8023AD) {
2857                         if (old_speed != slave->speed)
2858                                 bond_3ad_adapter_speed_changed(slave);
2859                         if (old_duplex != slave->duplex)
2860                                 bond_3ad_adapter_duplex_changed(slave);
2861                 }
2862                 break;
2863         case NETDEV_DOWN:
2864                 /*
2865                  * ... Or is it this?
2866                  */
2867                 break;
2868         case NETDEV_CHANGEMTU:
2869                 /*
2870                  * TODO: Should slaves be allowed to
2871                  * independently alter their MTU?  For
2872                  * an active-backup bond, slaves need
2873                  * not be the same type of device, so
2874                  * MTUs may vary.  For other modes,
2875                  * slaves arguably should have the
2876                  * same MTUs. To do this, we'd need to
2877                  * take over the slave's change_mtu
2878                  * function for the duration of their
2879                  * servitude.
2880                  */
2881                 break;
2882         case NETDEV_CHANGENAME:
2883                 /* we don't care if we don't have primary set */
2884                 if (!USES_PRIMARY(bond->params.mode) ||
2885                     !bond->params.primary[0])
2886                         break;
2887 
2888                 if (slave == bond->primary_slave) {
2889                         /* slave's name changed - he's no longer primary */
2890                         bond->primary_slave = NULL;
2891                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2892                         /* we have a new primary slave */
2893                         bond->primary_slave = slave;
2894                 } else { /* we didn't change primary - exit */
2895                         break;
2896                 }
2897 
2898                 pr_info("%s: Primary slave changed to %s, reselecting active slave\n",
2899                         bond->dev->name,
2900                         bond->primary_slave ? slave_dev->name : "none");
2901 
2902                 block_netpoll_tx();
2903                 write_lock_bh(&bond->curr_slave_lock);
2904                 bond_select_active_slave(bond);
2905                 write_unlock_bh(&bond->curr_slave_lock);
2906                 unblock_netpoll_tx();
2907                 break;
2908         case NETDEV_FEAT_CHANGE:
2909                 bond_compute_features(bond);
2910                 break;
2911         case NETDEV_RESEND_IGMP:
2912                 /* Propagate to master device */
2913                 call_netdevice_notifiers(event, slave->bond->dev);
2914                 break;
2915         default:
2916                 break;
2917         }
2918 
2919         return NOTIFY_DONE;
2920 }
2921 
2922 /*
2923  * bond_netdev_event: handle netdev notifier chain events.
2924  *
2925  * This function receives events for the netdev chain.  The caller (an
2926  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2927  * locks for us to safely manipulate the slave devices (RTNL lock,
2928  * dev_probe_lock).
2929  */
2930 static int bond_netdev_event(struct notifier_block *this,
2931                              unsigned long event, void *ptr)
2932 {
2933         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2934 
2935         pr_debug("event_dev: %s, event: %lx\n",
2936                  event_dev ? event_dev->name : "None", event);
2937 
2938         if (!(event_dev->priv_flags & IFF_BONDING))
2939                 return NOTIFY_DONE;
2940 
2941         if (event_dev->flags & IFF_MASTER) {
2942                 pr_debug("IFF_MASTER\n");
2943                 return bond_master_netdev_event(event, event_dev);
2944         }
2945 
2946         if (event_dev->flags & IFF_SLAVE) {
2947                 pr_debug("IFF_SLAVE\n");
2948                 return bond_slave_netdev_event(event, event_dev);
2949         }
2950 
2951         return NOTIFY_DONE;
2952 }
2953 
2954 static struct notifier_block bond_netdev_notifier = {
2955         .notifier_call = bond_netdev_event,
2956 };
2957 
2958 /*---------------------------- Hashing Policies -----------------------------*/
2959 
2960 /* L2 hash helper */
2961 static inline u32 bond_eth_hash(struct sk_buff *skb)
2962 {
2963         struct ethhdr *data = (struct ethhdr *)skb->data;
2964 
2965         if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2966                 return data->h_dest[5] ^ data->h_source[5];
2967 
2968         return 0;
2969 }
2970 
2971 /* Extract the appropriate headers based on bond's xmit policy */
2972 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2973                               struct flow_keys *fk)
2974 {
2975         const struct ipv6hdr *iph6;
2976         const struct iphdr *iph;
2977         int noff, proto = -1;
2978 
2979         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2980                 return skb_flow_dissect(skb, fk);
2981 
2982         fk->ports = 0;
2983         noff = skb_network_offset(skb);
2984         if (skb->protocol == htons(ETH_P_IP)) {
2985                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
2986                         return false;
2987                 iph = ip_hdr(skb);
2988                 fk->src = iph->saddr;
2989                 fk->dst = iph->daddr;
2990                 noff += iph->ihl << 2;
2991                 if (!ip_is_fragment(iph))
2992                         proto = iph->protocol;
2993         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2994                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
2995                         return false;
2996                 iph6 = ipv6_hdr(skb);
2997                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2998                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2999                 noff += sizeof(*iph6);
3000                 proto = iph6->nexthdr;
3001         } else {
3002                 return false;
3003         }
3004         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3005                 fk->ports = skb_flow_get_ports(skb, noff, proto);
3006 
3007         return true;
3008 }
3009 
3010 /**
3011  * bond_xmit_hash - generate a hash value based on the xmit policy
3012  * @bond: bonding device
3013  * @skb: buffer to use for headers
3014  * @count: modulo value
3015  *
3016  * This function will extract the necessary headers from the skb buffer and use
3017  * them to generate a hash based on the xmit_policy set in the bonding device
3018  * which will be reduced modulo count before returning.
3019  */
3020 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
3021 {
3022         struct flow_keys flow;
3023         u32 hash;
3024 
3025         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3026             !bond_flow_dissect(bond, skb, &flow))
3027                 return bond_eth_hash(skb) % count;
3028 
3029         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3030             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3031                 hash = bond_eth_hash(skb);
3032         else
3033                 hash = (__force u32)flow.ports;
3034         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3035         hash ^= (hash >> 16);
3036         hash ^= (hash >> 8);
3037 
3038         return hash % count;
3039 }
3040 
3041 /*-------------------------- Device entry points ----------------------------*/
3042 
3043 static void bond_work_init_all(struct bonding *bond)
3044 {
3045         INIT_DELAYED_WORK(&bond->mcast_work,
3046                           bond_resend_igmp_join_requests_delayed);
3047         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3048         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3049         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3050                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3051         else
3052                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3053         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3054 }
3055 
3056 static void bond_work_cancel_all(struct bonding *bond)
3057 {
3058         cancel_delayed_work_sync(&bond->mii_work);
3059         cancel_delayed_work_sync(&bond->arp_work);
3060         cancel_delayed_work_sync(&bond->alb_work);
3061         cancel_delayed_work_sync(&bond->ad_work);
3062         cancel_delayed_work_sync(&bond->mcast_work);
3063 }
3064 
3065 static int bond_open(struct net_device *bond_dev)
3066 {
3067         struct bonding *bond = netdev_priv(bond_dev);
3068         struct list_head *iter;
3069         struct slave *slave;
3070 
3071         /* reset slave->backup and slave->inactive */
3072         read_lock(&bond->lock);
3073         if (bond_has_slaves(bond)) {
3074                 read_lock(&bond->curr_slave_lock);
3075                 bond_for_each_slave(bond, slave, iter) {
3076                         if (USES_PRIMARY(bond->params.mode)
3077                                 && (slave != bond->curr_active_slave)) {
3078                                 bond_set_slave_inactive_flags(slave,
3079                                                               BOND_SLAVE_NOTIFY_NOW);
3080                         } else {
3081                                 bond_set_slave_active_flags(slave,
3082                                                             BOND_SLAVE_NOTIFY_NOW);
3083                         }
3084                 }
3085                 read_unlock(&bond->curr_slave_lock);
3086         }
3087         read_unlock(&bond->lock);
3088 
3089         bond_work_init_all(bond);
3090 
3091         if (bond_is_lb(bond)) {
3092                 /* bond_alb_initialize must be called before the timer
3093                  * is started.
3094                  */
3095                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3096                         return -ENOMEM;
3097                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3098         }
3099 
3100         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3101                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3102 
3103         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3104                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3105                 bond->recv_probe = bond_arp_rcv;
3106         }
3107 
3108         if (bond->params.mode == BOND_MODE_8023AD) {
3109                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3110                 /* register to receive LACPDUs */
3111                 bond->recv_probe = bond_3ad_lacpdu_recv;
3112                 bond_3ad_initiate_agg_selection(bond, 1);
3113         }
3114 
3115         return 0;
3116 }
3117 
3118 static int bond_close(struct net_device *bond_dev)
3119 {
3120         struct bonding *bond = netdev_priv(bond_dev);
3121 
3122         bond_work_cancel_all(bond);
3123         bond->send_peer_notif = 0;
3124         if (bond_is_lb(bond))
3125                 bond_alb_deinitialize(bond);
3126         bond->recv_probe = NULL;
3127 
3128         return 0;
3129 }
3130 
3131 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3132                                                 struct rtnl_link_stats64 *stats)
3133 {
3134         struct bonding *bond = netdev_priv(bond_dev);
3135         struct rtnl_link_stats64 temp;
3136         struct list_head *iter;
3137         struct slave *slave;
3138 
3139         memset(stats, 0, sizeof(*stats));
3140 
3141         read_lock_bh(&bond->lock);
3142         bond_for_each_slave(bond, slave, iter) {
3143                 const struct rtnl_link_stats64 *sstats =
3144                         dev_get_stats(slave->dev, &temp);
3145 
3146                 stats->rx_packets += sstats->rx_packets;
3147                 stats->rx_bytes += sstats->rx_bytes;
3148                 stats->rx_errors += sstats->rx_errors;
3149                 stats->rx_dropped += sstats->rx_dropped;
3150 
3151                 stats->tx_packets += sstats->tx_packets;
3152                 stats->tx_bytes += sstats->tx_bytes;
3153                 stats->tx_errors += sstats->tx_errors;
3154                 stats->tx_dropped += sstats->tx_dropped;
3155 
3156                 stats->multicast += sstats->multicast;
3157                 stats->collisions += sstats->collisions;
3158 
3159                 stats->rx_length_errors += sstats->rx_length_errors;
3160                 stats->rx_over_errors += sstats->rx_over_errors;
3161                 stats->rx_crc_errors += sstats->rx_crc_errors;
3162                 stats->rx_frame_errors += sstats->rx_frame_errors;
3163                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3164                 stats->rx_missed_errors += sstats->rx_missed_errors;
3165 
3166                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3167                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3168                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3169                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3170                 stats->tx_window_errors += sstats->tx_window_errors;
3171         }
3172         read_unlock_bh(&bond->lock);
3173 
3174         return stats;
3175 }
3176 
3177 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3178 {
3179         struct bonding *bond = netdev_priv(bond_dev);
3180         struct net_device *slave_dev = NULL;
3181         struct ifbond k_binfo;
3182         struct ifbond __user *u_binfo = NULL;
3183         struct ifslave k_sinfo;
3184         struct ifslave __user *u_sinfo = NULL;
3185         struct mii_ioctl_data *mii = NULL;
3186         struct bond_opt_value newval;
3187         struct net *net;
3188         int res = 0;
3189 
3190         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3191 
3192         switch (cmd) {
3193         case SIOCGMIIPHY:
3194                 mii = if_mii(ifr);
3195                 if (!mii)
3196                         return -EINVAL;
3197 
3198                 mii->phy_id = 0;
3199                 /* Fall Through */
3200         case SIOCGMIIREG:
3201                 /*
3202                  * We do this again just in case we were called by SIOCGMIIREG
3203                  * instead of SIOCGMIIPHY.
3204                  */
3205                 mii = if_mii(ifr);
3206                 if (!mii)
3207                         return -EINVAL;
3208 
3209 
3210                 if (mii->reg_num == 1) {
3211                         mii->val_out = 0;
3212                         read_lock(&bond->lock);
3213                         read_lock(&bond->curr_slave_lock);
3214                         if (netif_carrier_ok(bond->dev))
3215                                 mii->val_out = BMSR_LSTATUS;
3216 
3217                         read_unlock(&bond->curr_slave_lock);
3218                         read_unlock(&bond->lock);
3219                 }
3220 
3221                 return 0;
3222         case BOND_INFO_QUERY_OLD:
3223         case SIOCBONDINFOQUERY:
3224                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3225 
3226                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3227                         return -EFAULT;
3228 
3229                 res = bond_info_query(bond_dev, &k_binfo);
3230                 if (res == 0 &&
3231                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3232                         return -EFAULT;
3233 
3234                 return res;
3235         case BOND_SLAVE_INFO_QUERY_OLD:
3236         case SIOCBONDSLAVEINFOQUERY:
3237                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3238 
3239                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3240                         return -EFAULT;
3241 
3242                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3243                 if (res == 0 &&
3244                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3245                         return -EFAULT;
3246 
3247                 return res;
3248         default:
3249                 /* Go on */
3250                 break;
3251         }
3252 
3253         net = dev_net(bond_dev);
3254 
3255         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3256                 return -EPERM;
3257 
3258         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3259 
3260         pr_debug("slave_dev=%p:\n", slave_dev);
3261 
3262         if (!slave_dev)
3263                 return -ENODEV;
3264 
3265         pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3266         switch (cmd) {
3267         case BOND_ENSLAVE_OLD:
3268         case SIOCBONDENSLAVE:
3269                 res = bond_enslave(bond_dev, slave_dev);
3270                 break;
3271         case BOND_RELEASE_OLD:
3272         case SIOCBONDRELEASE:
3273                 res = bond_release(bond_dev, slave_dev);
3274                 break;
3275         case BOND_SETHWADDR_OLD:
3276         case SIOCBONDSETHWADDR:
3277                 bond_set_dev_addr(bond_dev, slave_dev);
3278                 res = 0;
3279                 break;
3280         case BOND_CHANGE_ACTIVE_OLD:
3281         case SIOCBONDCHANGEACTIVE:
3282                 bond_opt_initstr(&newval, slave_dev->name);
3283                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3284                 break;
3285         default:
3286                 res = -EOPNOTSUPP;
3287         }
3288 
3289         return res;
3290 }
3291 
3292 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3293 {
3294         struct bonding *bond = netdev_priv(bond_dev);
3295 
3296         if (change & IFF_PROMISC)
3297                 bond_set_promiscuity(bond,
3298                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3299 
3300         if (change & IFF_ALLMULTI)
3301                 bond_set_allmulti(bond,
3302                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3303 }
3304 
3305 static void bond_set_rx_mode(struct net_device *bond_dev)
3306 {
3307         struct bonding *bond = netdev_priv(bond_dev);
3308         struct list_head *iter;
3309         struct slave *slave;
3310 
3311 
3312         rcu_read_lock();
3313         if (USES_PRIMARY(bond->params.mode)) {
3314                 slave = rcu_dereference(bond->curr_active_slave);
3315                 if (slave) {
3316                         dev_uc_sync(slave->dev, bond_dev);
3317                         dev_mc_sync(slave->dev, bond_dev);
3318                 }
3319         } else {
3320                 bond_for_each_slave_rcu(bond, slave, iter) {
3321                         dev_uc_sync_multiple(slave->dev, bond_dev);
3322                         dev_mc_sync_multiple(slave->dev, bond_dev);
3323                 }
3324         }
3325         rcu_read_unlock();
3326 }
3327 
3328 static int bond_neigh_init(struct neighbour *n)
3329 {
3330         struct bonding *bond = netdev_priv(n->dev);
3331         const struct net_device_ops *slave_ops;
3332         struct neigh_parms parms;
3333         struct slave *slave;
3334         int ret;
3335 
3336         slave = bond_first_slave(bond);
3337         if (!slave)
3338                 return 0;
3339         slave_ops = slave->dev->netdev_ops;
3340         if (!slave_ops->ndo_neigh_setup)
3341                 return 0;
3342 
3343         parms.neigh_setup = NULL;
3344         parms.neigh_cleanup = NULL;
3345         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3346         if (ret)
3347                 return ret;
3348 
3349         /*
3350          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3351          * after the last slave has been detached.  Assumes that all slaves
3352          * utilize the same neigh_cleanup (true at this writing as only user
3353          * is ipoib).
3354          */
3355         n->parms->neigh_cleanup = parms.neigh_cleanup;
3356 
3357         if (!parms.neigh_setup)
3358                 return 0;
3359 
3360         return parms.neigh_setup(n);
3361 }
3362 
3363 /*
3364  * The bonding ndo_neigh_setup is called at init time beofre any
3365  * slave exists. So we must declare proxy setup function which will
3366  * be used at run time to resolve the actual slave neigh param setup.
3367  *
3368  * It's also called by master devices (such as vlans) to setup their
3369  * underlying devices. In that case - do nothing, we're already set up from
3370  * our init.
3371  */
3372 static int bond_neigh_setup(struct net_device *dev,
3373                             struct neigh_parms *parms)
3374 {
3375         /* modify only our neigh_parms */
3376         if (parms->dev == dev)
3377                 parms->neigh_setup = bond_neigh_init;
3378 
3379         return 0;
3380 }
3381 
3382 /*
3383  * Change the MTU of all of a master's slaves to match the master
3384  */
3385 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3386 {
3387         struct bonding *bond = netdev_priv(bond_dev);
3388         struct slave *slave, *rollback_slave;
3389         struct list_head *iter;
3390         int res = 0;
3391 
3392         pr_debug("bond=%p, name=%s, new_mtu=%d\n",
3393                  bond, bond_dev ? bond_dev->name : "None", new_mtu);
3394 
3395         /* Can't hold bond->lock with bh disabled here since
3396          * some base drivers panic. On the other hand we can't
3397          * hold bond->lock without bh disabled because we'll
3398          * deadlock. The only solution is to rely on the fact
3399          * that we're under rtnl_lock here, and the slaves
3400          * list won't change. This doesn't solve the problem
3401          * of setting the slave's MTU while it is
3402          * transmitting, but the assumption is that the base
3403          * driver can handle that.
3404          *
3405          * TODO: figure out a way to safely iterate the slaves
3406          * list, but without holding a lock around the actual
3407          * call to the base driver.
3408          */
3409 
3410         bond_for_each_slave(bond, slave, iter) {
3411                 pr_debug("s %p c_m %p\n",
3412                          slave, slave->dev->netdev_ops->ndo_change_mtu);
3413 
3414                 res = dev_set_mtu(slave->dev, new_mtu);
3415 
3416                 if (res) {
3417                         /* If we failed to set the slave's mtu to the new value
3418                          * we must abort the operation even in ACTIVE_BACKUP
3419                          * mode, because if we allow the backup slaves to have
3420                          * different mtu values than the active slave we'll
3421                          * need to change their mtu when doing a failover. That
3422                          * means changing their mtu from timer context, which
3423                          * is probably not a good idea.
3424                          */
3425                         pr_debug("err %d %s\n", res, slave->dev->name);
3426                         goto unwind;
3427                 }
3428         }
3429 
3430         bond_dev->mtu = new_mtu;
3431 
3432         return 0;
3433 
3434 unwind:
3435         /* unwind from head to the slave that failed */
3436         bond_for_each_slave(bond, rollback_slave, iter) {
3437                 int tmp_res;
3438 
3439                 if (rollback_slave == slave)
3440                         break;
3441 
3442                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3443                 if (tmp_res) {
3444                         pr_debug("unwind err %d dev %s\n",
3445                                  tmp_res, rollback_slave->dev->name);
3446                 }
3447         }
3448 
3449         return res;
3450 }
3451 
3452 /*
3453  * Change HW address
3454  *
3455  * Note that many devices must be down to change the HW address, and
3456  * downing the master releases all slaves.  We can make bonds full of
3457  * bonding devices to test this, however.
3458  */
3459 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3460 {
3461         struct bonding *bond = netdev_priv(bond_dev);
3462         struct slave *slave, *rollback_slave;
3463         struct sockaddr *sa = addr, tmp_sa;
3464         struct list_head *iter;
3465         int res = 0;
3466 
3467         if (bond->params.mode == BOND_MODE_ALB)
3468                 return bond_alb_set_mac_address(bond_dev, addr);
3469 
3470 
3471         pr_debug("bond=%p, name=%s\n",
3472                  bond, bond_dev ? bond_dev->name : "None");
3473 
3474         /* If fail_over_mac is enabled, do nothing and return success.
3475          * Returning an error causes ifenslave to fail.
3476          */
3477         if (bond->params.fail_over_mac &&
3478             bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3479                 return 0;
3480 
3481         if (!is_valid_ether_addr(sa->sa_data))
3482                 return -EADDRNOTAVAIL;
3483 
3484         /* Can't hold bond->lock with bh disabled here since
3485          * some base drivers panic. On the other hand we can't
3486          * hold bond->lock without bh disabled because we'll
3487          * deadlock. The only solution is to rely on the fact
3488          * that we're under rtnl_lock here, and the slaves
3489          * list won't change. This doesn't solve the problem
3490          * of setting the slave's hw address while it is
3491          * transmitting, but the assumption is that the base
3492          * driver can handle that.
3493          *
3494          * TODO: figure out a way to safely iterate the slaves
3495          * list, but without holding a lock around the actual
3496          * call to the base driver.
3497          */
3498 
3499         bond_for_each_slave(bond, slave, iter) {
3500                 pr_debug("slave %p %s\n", slave, slave->dev->name);
3501                 res = dev_set_mac_address(slave->dev, addr);
3502                 if (res) {
3503                         /* TODO: consider downing the slave
3504                          * and retry ?
3505                          * User should expect communications
3506                          * breakage anyway until ARP finish
3507                          * updating, so...
3508                          */
3509                         pr_debug("err %d %s\n", res, slave->dev->name);
3510                         goto unwind;
3511                 }
3512         }
3513 
3514         /* success */
3515         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3516         return 0;
3517 
3518 unwind:
3519         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3520         tmp_sa.sa_family = bond_dev->type;
3521 
3522         /* unwind from head to the slave that failed */
3523         bond_for_each_slave(bond, rollback_slave, iter) {
3524                 int tmp_res;
3525 
3526                 if (rollback_slave == slave)
3527                         break;
3528 
3529                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3530                 if (tmp_res) {
3531                         pr_debug("unwind err %d dev %s\n",
3532                                  tmp_res, rollback_slave->dev->name);
3533                 }
3534         }
3535 
3536         return res;
3537 }
3538 
3539 /**
3540  * bond_xmit_slave_id - transmit skb through slave with slave_id
3541  * @bond: bonding device that is transmitting
3542  * @skb: buffer to transmit
3543  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3544  *
3545  * This function tries to transmit through slave with slave_id but in case
3546  * it fails, it tries to find the first available slave for transmission.
3547  * The skb is consumed in all cases, thus the function is void.
3548  */
3549 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3550 {
3551         struct list_head *iter;
3552         struct slave *slave;
3553         int i = slave_id;
3554 
3555         /* Here we start from the slave with slave_id */
3556         bond_for_each_slave_rcu(bond, slave, iter) {
3557                 if (--i < 0) {
3558                         if (slave_can_tx(slave)) {
3559                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3560                                 return;
3561                         }
3562                 }
3563         }
3564 
3565         /* Here we start from the first slave up to slave_id */
3566         i = slave_id;
3567         bond_for_each_slave_rcu(bond, slave, iter) {
3568                 if (--i < 0)
3569                         break;
3570                 if (slave_can_tx(slave)) {
3571                         bond_dev_queue_xmit(bond, skb, slave->dev);
3572                         return;
3573                 }
3574         }
3575         /* no slave that can tx has been found */
3576         dev_kfree_skb_any(skb);
3577 }
3578 
3579 /**
3580  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3581  * @bond: bonding device to use
3582  *
3583  * Based on the value of the bonding device's packets_per_slave parameter
3584  * this function generates a slave id, which is usually used as the next
3585  * slave to transmit through.
3586  */
3587 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3588 {
3589         u32 slave_id;
3590         struct reciprocal_value reciprocal_packets_per_slave;
3591         int packets_per_slave = bond->params.packets_per_slave;
3592 
3593         switch (packets_per_slave) {
3594         case 0:
3595                 slave_id = prandom_u32();
3596                 break;
3597         case 1:
3598                 slave_id = bond->rr_tx_counter;
3599                 break;
3600         default:
3601                 reciprocal_packets_per_slave =
3602                         bond->params.reciprocal_packets_per_slave;
3603                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3604                                              reciprocal_packets_per_slave);
3605                 break;
3606         }
3607         bond->rr_tx_counter++;
3608 
3609         return slave_id;
3610 }
3611 
3612 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3613 {
3614         struct bonding *bond = netdev_priv(bond_dev);
3615         struct iphdr *iph = ip_hdr(skb);
3616         struct slave *slave;
3617         u32 slave_id;
3618 
3619         /* Start with the curr_active_slave that joined the bond as the
3620          * default for sending IGMP traffic.  For failover purposes one
3621          * needs to maintain some consistency for the interface that will
3622          * send the join/membership reports.  The curr_active_slave found
3623          * will send all of this type of traffic.
3624          */
3625         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3626                 slave = rcu_dereference(bond->curr_active_slave);
3627                 if (slave && slave_can_tx(slave))
3628                         bond_dev_queue_xmit(bond, skb, slave->dev);
3629                 else
3630                         bond_xmit_slave_id(bond, skb, 0);
3631         } else {
3632                 slave_id = bond_rr_gen_slave_id(bond);
3633                 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3634         }
3635 
3636         return NETDEV_TX_OK;
3637 }
3638 
3639 /*
3640  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3641  * the bond has a usable interface.
3642  */
3643 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3644 {
3645         struct bonding *bond = netdev_priv(bond_dev);
3646         struct slave *slave;
3647 
3648         slave = rcu_dereference(bond->curr_active_slave);
3649         if (slave)
3650                 bond_dev_queue_xmit(bond, skb, slave->dev);
3651         else
3652                 dev_kfree_skb_any(skb);
3653 
3654         return NETDEV_TX_OK;
3655 }
3656 
3657 /* In bond_xmit_xor() , we determine the output device by using a pre-
3658  * determined xmit_hash_policy(), If the selected device is not enabled,
3659  * find the next active slave.
3660  */
3661 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3662 {
3663         struct bonding *bond = netdev_priv(bond_dev);
3664 
3665         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3666 
3667         return NETDEV_TX_OK;
3668 }
3669 
3670 /* in broadcast mode, we send everything to all usable interfaces. */
3671 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3672 {
3673         struct bonding *bond = netdev_priv(bond_dev);
3674         struct slave *slave = NULL;
3675         struct list_head *iter;
3676 
3677         bond_for_each_slave_rcu(bond, slave, iter) {
3678                 if (bond_is_last_slave(bond, slave))
3679                         break;
3680                 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3681                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3682 
3683                         if (!skb2) {
3684                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3685                                                     bond_dev->name, __func__);
3686                                 continue;
3687                         }
3688                         /* bond_dev_queue_xmit always returns 0 */
3689                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3690                 }
3691         }
3692         if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3693                 bond_dev_queue_xmit(bond, skb, slave->dev);
3694         else
3695                 dev_kfree_skb_any(skb);
3696 
3697         return NETDEV_TX_OK;
3698 }
3699 
3700 /*------------------------- Device initialization ---------------------------*/
3701 
3702 /*
3703  * Lookup the slave that corresponds to a qid
3704  */
3705 static inline int bond_slave_override(struct bonding *bond,
3706                                       struct sk_buff *skb)
3707 {
3708         struct slave *slave = NULL;
3709         struct list_head *iter;
3710 
3711         if (!skb->queue_mapping)
3712                 return 1;
3713 
3714         /* Find out if any slaves have the same mapping as this skb. */
3715         bond_for_each_slave_rcu(bond, slave, iter) {
3716                 if (slave->queue_id == skb->queue_mapping) {
3717                         if (slave_can_tx(slave)) {
3718                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3719                                 return 0;
3720                         }
3721                         /* If the slave isn't UP, use default transmit policy. */
3722                         break;
3723                 }
3724         }
3725 
3726         return 1;
3727 }
3728 
3729 
3730 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3731                              void *accel_priv, select_queue_fallback_t fallback)
3732 {
3733         /*
3734          * This helper function exists to help dev_pick_tx get the correct
3735          * destination queue.  Using a helper function skips a call to
3736          * skb_tx_hash and will put the skbs in the queue we expect on their
3737          * way down to the bonding driver.
3738          */
3739         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3740 
3741         /*
3742          * Save the original txq to restore before passing to the driver
3743          */
3744         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3745 
3746         if (unlikely(txq >= dev->real_num_tx_queues)) {
3747                 do {
3748                         txq -= dev->real_num_tx_queues;
3749                 } while (txq >= dev->real_num_tx_queues);
3750         }
3751         return txq;
3752 }
3753 
3754 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3755 {
3756         struct bonding *bond = netdev_priv(dev);
3757 
3758         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3759                 if (!bond_slave_override(bond, skb))
3760                         return NETDEV_TX_OK;
3761         }
3762 
3763         switch (bond->params.mode) {
3764         case BOND_MODE_ROUNDROBIN:
3765                 return bond_xmit_roundrobin(skb, dev);
3766         case BOND_MODE_ACTIVEBACKUP:
3767                 return bond_xmit_activebackup(skb, dev);
3768         case BOND_MODE_XOR:
3769                 return bond_xmit_xor(skb, dev);
3770         case BOND_MODE_BROADCAST:
3771                 return bond_xmit_broadcast(skb, dev);
3772         case BOND_MODE_8023AD:
3773                 return bond_3ad_xmit_xor(skb, dev);
3774         case BOND_MODE_ALB:
3775         case BOND_MODE_TLB:
3776                 return bond_alb_xmit(skb, dev);
3777         default:
3778                 /* Should never happen, mode already checked */
3779                 pr_err("%s: Error: Unknown bonding mode %d\n",
3780                        dev->name, bond->params.mode);
3781                 WARN_ON_ONCE(1);
3782                 dev_kfree_skb_any(skb);
3783                 return NETDEV_TX_OK;
3784         }
3785 }
3786 
3787 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3788 {
3789         struct bonding *bond = netdev_priv(dev);
3790         netdev_tx_t ret = NETDEV_TX_OK;
3791 
3792         /*
3793          * If we risk deadlock from transmitting this in the
3794          * netpoll path, tell netpoll to queue the frame for later tx
3795          */
3796         if (unlikely(is_netpoll_tx_blocked(dev)))
3797                 return NETDEV_TX_BUSY;
3798 
3799         rcu_read_lock();
3800         if (bond_has_slaves(bond))
3801                 ret = __bond_start_xmit(skb, dev);
3802         else
3803                 dev_kfree_skb_any(skb);
3804         rcu_read_unlock();
3805 
3806         return ret;
3807 }
3808 
3809 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3810                                      struct ethtool_cmd *ecmd)
3811 {
3812         struct bonding *bond = netdev_priv(bond_dev);
3813         unsigned long speed = 0;
3814         struct list_head *iter;
3815         struct slave *slave;
3816 
3817         ecmd->duplex = DUPLEX_UNKNOWN;
3818         ecmd->port = PORT_OTHER;
3819 
3820         /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3821          * do not need to check mode.  Though link speed might not represent
3822          * the true receive or transmit bandwidth (not all modes are symmetric)
3823          * this is an accurate maximum.
3824          */
3825         read_lock(&bond->lock);
3826         bond_for_each_slave(bond, slave, iter) {
3827                 if (SLAVE_IS_OK(slave)) {
3828                         if (slave->speed != SPEED_UNKNOWN)
3829                                 speed += slave->speed;
3830                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3831                             slave->duplex != DUPLEX_UNKNOWN)
3832                                 ecmd->duplex = slave->duplex;
3833                 }
3834         }
3835         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3836         read_unlock(&bond->lock);
3837 
3838         return 0;
3839 }
3840 
3841 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3842                                      struct ethtool_drvinfo *drvinfo)
3843 {
3844         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3845         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3846         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3847                  BOND_ABI_VERSION);
3848 }
3849 
3850 static const struct ethtool_ops bond_ethtool_ops = {
3851         .get_drvinfo            = bond_ethtool_get_drvinfo,
3852         .get_settings           = bond_ethtool_get_settings,
3853         .get_link               = ethtool_op_get_link,
3854 };
3855 
3856 static const struct net_device_ops bond_netdev_ops = {
3857         .ndo_init               = bond_init,
3858         .ndo_uninit             = bond_uninit,
3859         .ndo_open               = bond_open,
3860         .ndo_stop               = bond_close,
3861         .ndo_start_xmit         = bond_start_xmit,
3862         .ndo_select_queue       = bond_select_queue,
3863         .ndo_get_stats64        = bond_get_stats,
3864         .ndo_do_ioctl           = bond_do_ioctl,
3865         .ndo_change_rx_flags    = bond_change_rx_flags,
3866         .ndo_set_rx_mode        = bond_set_rx_mode,
3867         .ndo_change_mtu         = bond_change_mtu,
3868         .ndo_set_mac_address    = bond_set_mac_address,
3869         .ndo_neigh_setup        = bond_neigh_setup,
3870         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3871         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3872 #ifdef CONFIG_NET_POLL_CONTROLLER
3873         .ndo_netpoll_setup      = bond_netpoll_setup,
3874         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3875         .ndo_poll_controller    = bond_poll_controller,
3876 #endif
3877         .ndo_add_slave          = bond_enslave,
3878         .ndo_del_slave          = bond_release,
3879         .ndo_fix_features       = bond_fix_features,
3880 };
3881 
3882 static const struct device_type bond_type = {
3883         .name = "bond",
3884 };
3885 
3886 static void bond_destructor(struct net_device *bond_dev)
3887 {
3888         struct bonding *bond = netdev_priv(bond_dev);
3889         if (bond->wq)
3890                 destroy_workqueue(bond->wq);
3891         free_netdev(bond_dev);
3892 }
3893 
3894 void bond_setup(struct net_device *bond_dev)
3895 {
3896         struct bonding *bond = netdev_priv(bond_dev);
3897 
3898         /* initialize rwlocks */
3899         rwlock_init(&bond->lock);
3900         rwlock_init(&bond->curr_slave_lock);
3901         bond->params = bonding_defaults;
3902 
3903         /* Initialize pointers */
3904         bond->dev = bond_dev;
3905 
3906         /* Initialize the device entry points */
3907         ether_setup(bond_dev);
3908         bond_dev->netdev_ops = &bond_netdev_ops;
3909         bond_dev->ethtool_ops = &bond_ethtool_ops;
3910 
3911         bond_dev->destructor = bond_destructor;
3912 
3913         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3914 
3915         /* Initialize the device options */
3916         bond_dev->tx_queue_len = 0;
3917         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3918         bond_dev->priv_flags |= IFF_BONDING;
3919         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3920 
3921         /* At first, we block adding VLANs. That's the only way to
3922          * prevent problems that occur when adding VLANs over an
3923          * empty bond. The block will be removed once non-challenged
3924          * slaves are enslaved.
3925          */
3926         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3927 
3928         /* don't acquire bond device's netif_tx_lock when
3929          * transmitting */
3930         bond_dev->features |= NETIF_F_LLTX;
3931 
3932         /* By default, we declare the bond to be fully
3933          * VLAN hardware accelerated capable. Special
3934          * care is taken in the various xmit functions
3935          * when there are slaves that are not hw accel
3936          * capable
3937          */
3938 
3939         /* Don't allow bond devices to change network namespaces. */
3940         bond_dev->features |= NETIF_F_NETNS_LOCAL;
3941 
3942         bond_dev->hw_features = BOND_VLAN_FEATURES |
3943                                 NETIF_F_HW_VLAN_CTAG_TX |
3944                                 NETIF_F_HW_VLAN_CTAG_RX |
3945                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3946 
3947         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3948         bond_dev->features |= bond_dev->hw_features;
3949 }
3950 
3951 /*
3952 * Destroy a bonding device.
3953 * Must be under rtnl_lock when this function is called.
3954 */
3955 static void bond_uninit(struct net_device *bond_dev)
3956 {
3957         struct bonding *bond = netdev_priv(bond_dev);
3958         struct list_head *iter;
3959         struct slave *slave;
3960 
3961         bond_netpoll_cleanup(bond_dev);
3962 
3963         /* Release the bonded slaves */
3964         bond_for_each_slave(bond, slave, iter)
3965                 __bond_release_one(bond_dev, slave->dev, true);
3966         pr_info("%s: Released all slaves\n", bond_dev->name);
3967 
3968         list_del(&bond->bond_list);
3969 
3970         bond_debug_unregister(bond);
3971 }
3972 
3973 /*------------------------- Module initialization ---------------------------*/
3974 
3975 static int bond_check_params(struct bond_params *params)
3976 {
3977         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
3978         struct bond_opt_value newval;
3979         const struct bond_opt_value *valptr;
3980         int arp_all_targets_value;
3981 
3982         /*
3983          * Convert string parameters.
3984          */
3985         if (mode) {
3986                 bond_opt_initstr(&newval, mode);
3987                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
3988                 if (!valptr) {
3989                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
3990                         return -EINVAL;
3991                 }
3992                 bond_mode = valptr->value;
3993         }
3994 
3995         if (xmit_hash_policy) {
3996                 if ((bond_mode != BOND_MODE_XOR) &&
3997                     (bond_mode != BOND_MODE_8023AD)) {
3998                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
3999                                 bond_mode_name(bond_mode));
4000                 } else {
4001                         bond_opt_initstr(&newval, xmit_hash_policy);
4002                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4003                                                 &newval);
4004                         if (!valptr) {
4005                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4006                                        xmit_hash_policy);
4007                                 return -EINVAL;
4008                         }
4009                         xmit_hashtype = valptr->value;
4010                 }
4011         }
4012 
4013         if (lacp_rate) {
4014                 if (bond_mode != BOND_MODE_8023AD) {
4015                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4016                                 bond_mode_name(bond_mode));
4017                 } else {
4018                         bond_opt_initstr(&newval, lacp_rate);
4019                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4020                                                 &newval);
4021                         if (!valptr) {
4022                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4023                                        lacp_rate);
4024                                 return -EINVAL;
4025                         }
4026                         lacp_fast = valptr->value;
4027                 }
4028         }
4029 
4030         if (ad_select) {
4031                 bond_opt_initstr(&newval, lacp_rate);
4032                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4033                                         &newval);
4034                 if (!valptr) {
4035                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4036                         return -EINVAL;
4037                 }
4038                 params->ad_select = valptr->value;
4039                 if (bond_mode != BOND_MODE_8023AD)
4040                         pr_warn("ad_select param only affects 802.3ad mode\n");
4041         } else {
4042                 params->ad_select = BOND_AD_STABLE;
4043         }
4044 
4045         if (max_bonds < 0) {
4046                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4047                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4048                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4049         }
4050 
4051         if (miimon < 0) {
4052                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4053                         miimon, INT_MAX);
4054                 miimon = 0;
4055         }
4056 
4057         if (updelay < 0) {
4058                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4059                         updelay, INT_MAX);
4060                 updelay = 0;
4061         }
4062 
4063         if (downdelay < 0) {
4064                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4065                         downdelay, INT_MAX);
4066                 downdelay = 0;
4067         }
4068 
4069         if ((use_carrier != 0) && (use_carrier != 1)) {
4070                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4071                         use_carrier);
4072                 use_carrier = 1;
4073         }
4074 
4075         if (num_peer_notif < 0 || num_peer_notif > 255) {
4076                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4077                         num_peer_notif);
4078                 num_peer_notif = 1;
4079         }
4080 
4081         /* reset values for 802.3ad/TLB/ALB */
4082         if (BOND_NO_USES_ARP(bond_mode)) {
4083                 if (!miimon) {
4084                         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");
4085                         pr_warn("Forcing miimon to 100msec\n");
4086                         miimon = BOND_DEFAULT_MIIMON;
4087                 }
4088         }
4089 
4090         if (tx_queues < 1 || tx_queues > 255) {
4091                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4092                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4093                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4094         }
4095 
4096         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4097                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4098                         all_slaves_active);
4099                 all_slaves_active = 0;
4100         }
4101 
4102         if (resend_igmp < 0 || resend_igmp > 255) {
4103                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4104                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4105                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4106         }
4107 
4108         bond_opt_initval(&newval, packets_per_slave);
4109         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4110                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4111                         packets_per_slave, USHRT_MAX);
4112                 packets_per_slave = 1;
4113         }
4114 
4115         if (bond_mode == BOND_MODE_ALB) {
4116                 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",
4117                           updelay);
4118         }
4119 
4120         if (!miimon) {
4121                 if (updelay || downdelay) {
4122                         /* just warn the user the up/down delay will have
4123                          * no effect since miimon is zero...
4124                          */
4125                         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",
4126                                 updelay, downdelay);
4127                 }
4128         } else {
4129                 /* don't allow arp monitoring */
4130                 if (arp_interval) {
4131                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4132                                 miimon, arp_interval);
4133                         arp_interval = 0;
4134                 }
4135 
4136                 if ((updelay % miimon) != 0) {
4137                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4138                                 updelay, miimon, (updelay / miimon) * miimon);
4139                 }
4140 
4141                 updelay /= miimon;
4142 
4143                 if ((downdelay % miimon) != 0) {
4144                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4145                                 downdelay, miimon,
4146                                 (downdelay / miimon) * miimon);
4147                 }
4148 
4149                 downdelay /= miimon;
4150         }
4151 
4152         if (arp_interval < 0) {
4153                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4154                         arp_interval, INT_MAX);
4155                 arp_interval = 0;
4156         }
4157 
4158         for (arp_ip_count = 0, i = 0;
4159              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4160                 /* not complete check, but should be good enough to
4161                    catch mistakes */
4162                 __be32 ip;
4163                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4164                     IS_IP_TARGET_UNUSABLE_ADDRESS(ip)) {
4165                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4166                                 arp_ip_target[i]);
4167                         arp_interval = 0;
4168                 } else {
4169                         if (bond_get_targets_ip(arp_target, ip) == -1)
4170                                 arp_target[arp_ip_count++] = ip;
4171                         else
4172                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4173                                         &ip);
4174                 }
4175         }
4176 
4177         if (arp_interval && !arp_ip_count) {
4178                 /* don't allow arping if no arp_ip_target given... */
4179                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4180                         arp_interval);
4181                 arp_interval = 0;
4182         }
4183 
4184         if (arp_validate) {
4185                 if (!arp_interval) {
4186                         pr_err("arp_validate requires arp_interval\n");
4187                         return -EINVAL;
4188                 }
4189 
4190                 bond_opt_initstr(&newval, arp_validate);
4191                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4192                                         &newval);
4193                 if (!valptr) {
4194                         pr_err("Error: invalid arp_validate \"%s\"\n",
4195                                arp_validate);
4196                         return -EINVAL;
4197                 }
4198                 arp_validate_value = valptr->value;
4199         } else {
4200                 arp_validate_value = 0;
4201         }
4202 
4203         arp_all_targets_value = 0;
4204         if (arp_all_targets) {
4205                 bond_opt_initstr(&newval, arp_all_targets);
4206                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4207                                         &newval);
4208                 if (!valptr) {
4209                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4210                                arp_all_targets);
4211                         arp_all_targets_value = 0;
4212                 } else {
4213                         arp_all_targets_value = valptr->value;
4214                 }
4215         }
4216 
4217         if (miimon) {
4218                 pr_info("MII link monitoring set to %d ms\n", miimon);
4219         } else if (arp_interval) {
4220                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4221                                           arp_validate_value);
4222                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4223                         arp_interval, valptr->string, arp_ip_count);
4224 
4225                 for (i = 0; i < arp_ip_count; i++)
4226                         pr_cont(" %s", arp_ip_target[i]);
4227 
4228                 pr_cont("\n");
4229 
4230         } else if (max_bonds) {
4231                 /* miimon and arp_interval not set, we need one so things
4232                  * work as expected, see bonding.txt for details
4233                  */
4234                 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");
4235         }
4236 
4237         if (primary && !USES_PRIMARY(bond_mode)) {
4238                 /* currently, using a primary only makes sense
4239                  * in active backup, TLB or ALB modes
4240                  */
4241                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4242                         primary, bond_mode_name(bond_mode));
4243                 primary = NULL;
4244         }
4245 
4246         if (primary && primary_reselect) {
4247                 bond_opt_initstr(&newval, primary_reselect);
4248                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4249                                         &newval);
4250                 if (!valptr) {
4251                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4252                                primary_reselect);
4253                         return -EINVAL;
4254                 }
4255                 primary_reselect_value = valptr->value;
4256         } else {
4257                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4258         }
4259 
4260         if (fail_over_mac) {
4261                 bond_opt_initstr(&newval, fail_over_mac);
4262                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4263                                         &newval);
4264                 if (!valptr) {
4265                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4266                                fail_over_mac);
4267                         return -EINVAL;
4268                 }
4269                 fail_over_mac_value = valptr->value;
4270                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4271                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4272         } else {
4273                 fail_over_mac_value = BOND_FOM_NONE;
4274         }
4275 
4276         if (lp_interval == 0) {
4277                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4278                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4279                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4280         }
4281 
4282         /* fill params struct with the proper values */
4283         params->mode = bond_mode;
4284         params->xmit_policy = xmit_hashtype;
4285         params->miimon = miimon;
4286         params->num_peer_notif = num_peer_notif;
4287         params->arp_interval = arp_interval;
4288         params->arp_validate = arp_validate_value;
4289         params->arp_all_targets = arp_all_targets_value;
4290         params->updelay = updelay;
4291         params->downdelay = downdelay;
4292         params->use_carrier = use_carrier;
4293         params->lacp_fast = lacp_fast;
4294         params->primary[0] = 0;
4295         params->primary_reselect = primary_reselect_value;
4296         params->fail_over_mac = fail_over_mac_value;
4297         params->tx_queues = tx_queues;
4298         params->all_slaves_active = all_slaves_active;
4299         params->resend_igmp = resend_igmp;
4300         params->min_links = min_links;
4301         params->lp_interval = lp_interval;
4302         params->packets_per_slave = packets_per_slave;
4303         if (packets_per_slave > 0) {
4304                 params->reciprocal_packets_per_slave =
4305                         reciprocal_value(packets_per_slave);
4306         } else {
4307                 /* reciprocal_packets_per_slave is unused if
4308                  * packets_per_slave is 0 or 1, just initialize it
4309                  */
4310                 params->reciprocal_packets_per_slave =
4311                         (struct reciprocal_value) { 0 };
4312         }
4313 
4314         if (primary) {
4315                 strncpy(params->primary, primary, IFNAMSIZ);
4316                 params->primary[IFNAMSIZ - 1] = 0;
4317         }
4318 
4319         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4320 
4321         return 0;
4322 }
4323 
4324 static struct lock_class_key bonding_netdev_xmit_lock_key;
4325 static struct lock_class_key bonding_netdev_addr_lock_key;
4326 static struct lock_class_key bonding_tx_busylock_key;
4327 
4328 static void bond_set_lockdep_class_one(struct net_device *dev,
4329                                        struct netdev_queue *txq,
4330                                        void *_unused)
4331 {
4332         lockdep_set_class(&txq->_xmit_lock,
4333                           &bonding_netdev_xmit_lock_key);
4334 }
4335 
4336 static void bond_set_lockdep_class(struct net_device *dev)
4337 {
4338         lockdep_set_class(&dev->addr_list_lock,
4339                           &bonding_netdev_addr_lock_key);
4340         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4341         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4342 }
4343 
4344 /*
4345  * Called from registration process
4346  */
4347 static int bond_init(struct net_device *bond_dev)
4348 {
4349         struct bonding *bond = netdev_priv(bond_dev);
4350         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4351         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4352 
4353         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4354 
4355         /*
4356          * Initialize locks that may be required during
4357          * en/deslave operations.  All of the bond_open work
4358          * (of which this is part) should really be moved to
4359          * a phase prior to dev_open
4360          */
4361         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4362         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4363 
4364         bond->wq = create_singlethread_workqueue(bond_dev->name);
4365         if (!bond->wq)
4366                 return -ENOMEM;
4367 
4368         bond_set_lockdep_class(bond_dev);
4369 
4370         list_add_tail(&bond->bond_list, &bn->dev_list);
4371 
4372         bond_prepare_sysfs_group(bond);
4373 
4374         bond_debug_register(bond);
4375 
4376         /* Ensure valid dev_addr */
4377         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4378             bond_dev->addr_assign_type == NET_ADDR_PERM)
4379                 eth_hw_addr_random(bond_dev);
4380 
4381         return 0;
4382 }
4383 
4384 unsigned int bond_get_num_tx_queues(void)
4385 {
4386         return tx_queues;
4387 }
4388 
4389 /* Create a new bond based on the specified name and bonding parameters.
4390  * If name is NULL, obtain a suitable "bond%d" name for us.
4391  * Caller must NOT hold rtnl_lock; we need to release it here before we
4392  * set up our sysfs entries.
4393  */
4394 int bond_create(struct net *net, const char *name)
4395 {
4396         struct net_device *bond_dev;
4397         int res;
4398 
4399         rtnl_lock();
4400 
4401         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4402                                    name ? name : "bond%d",
4403                                    bond_setup, tx_queues);
4404         if (!bond_dev) {
4405                 pr_err("%s: eek! can't alloc netdev!\n", name);
4406                 rtnl_unlock();
4407                 return -ENOMEM;
4408         }
4409 
4410         dev_net_set(bond_dev, net);
4411         bond_dev->rtnl_link_ops = &bond_link_ops;
4412 
4413         res = register_netdevice(bond_dev);
4414 
4415         netif_carrier_off(bond_dev);
4416 
4417         rtnl_unlock();
4418         if (res < 0)
4419                 bond_destructor(bond_dev);
4420         return res;
4421 }
4422 
4423 static int __net_init bond_net_init(struct net *net)
4424 {
4425         struct bond_net *bn = net_generic(net, bond_net_id);
4426 
4427         bn->net = net;
4428         INIT_LIST_HEAD(&bn->dev_list);
4429 
4430         bond_create_proc_dir(bn);
4431         bond_create_sysfs(bn);
4432 
4433         return 0;
4434 }
4435 
4436 static void __net_exit bond_net_exit(struct net *net)
4437 {
4438         struct bond_net *bn = net_generic(net, bond_net_id);
4439         struct bonding *bond, *tmp_bond;
4440         LIST_HEAD(list);
4441 
4442         bond_destroy_sysfs(bn);
4443         bond_destroy_proc_dir(bn);
4444 
4445         /* Kill off any bonds created after unregistering bond rtnl ops */
4446         rtnl_lock();
4447         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4448                 unregister_netdevice_queue(bond->dev, &list);
4449         unregister_netdevice_many(&list);
4450         rtnl_unlock();
4451 }
4452 
4453 static struct pernet_operations bond_net_ops = {
4454         .init = bond_net_init,
4455         .exit = bond_net_exit,
4456         .id   = &bond_net_id,
4457         .size = sizeof(struct bond_net),
4458 };
4459 
4460 static int __init bonding_init(void)
4461 {
4462         int i;
4463         int res;
4464 
4465         pr_info("%s", bond_version);
4466 
4467         res = bond_check_params(&bonding_defaults);
4468         if (res)
4469                 goto out;
4470 
4471         res = register_pernet_subsys(&bond_net_ops);
4472         if (res)
4473                 goto out;
4474 
4475         res = bond_netlink_init();
4476         if (res)
4477                 goto err_link;
4478 
4479         bond_create_debugfs();
4480 
4481         for (i = 0; i < max_bonds; i++) {
4482                 res = bond_create(&init_net, NULL);
4483                 if (res)
4484                         goto err;
4485         }
4486 
4487         register_netdevice_notifier(&bond_netdev_notifier);
4488 out:
4489         return res;
4490 err:
4491         bond_destroy_debugfs();
4492         bond_netlink_fini();
4493 err_link:
4494         unregister_pernet_subsys(&bond_net_ops);
4495         goto out;
4496 
4497 }
4498 
4499 static void __exit bonding_exit(void)
4500 {
4501         unregister_netdevice_notifier(&bond_netdev_notifier);
4502 
4503         bond_destroy_debugfs();
4504 
4505         bond_netlink_fini();
4506         unregister_pernet_subsys(&bond_net_ops);
4507 
4508 #ifdef CONFIG_NET_POLL_CONTROLLER
4509         /*
4510          * Make sure we don't have an imbalance on our netpoll blocking
4511          */
4512         WARN_ON(atomic_read(&netpoll_block_tx));
4513 #endif
4514 }
4515 
4516 module_init(bonding_init);
4517 module_exit(bonding_exit);
4518 MODULE_LICENSE("GPL");
4519 MODULE_VERSION(DRV_VERSION);
4520 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4521 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4522 

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