Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/net/bonding/bond_main.c

  1 /*
  2  * originally based on the dummy device.
  3  *
  4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
  5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
  6  *
  7  * bonding.c: an Ethernet Bonding driver
  8  *
  9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
 10  *      Cisco 5500
 11  *      Sun Trunking (Solaris)
 12  *      Alteon AceDirector Trunks
 13  *      Linux Bonding
 14  *      and probably many L2 switches ...
 15  *
 16  * How it works:
 17  *    ifconfig bond0 ipaddress netmask up
 18  *      will setup a network device, with an ip address.  No mac address
 19  *      will be assigned at this time.  The hw mac address will come from
 20  *      the first slave bonded to the channel.  All slaves will then use
 21  *      this hw mac address.
 22  *
 23  *    ifconfig bond0 down
 24  *         will release all slaves, marking them as down.
 25  *
 26  *    ifenslave bond0 eth0
 27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
 28  *      a: be used as initial mac address
 29  *      b: if a hw mac address already is there, eth0's hw mac address
 30  *         will then be set from bond0.
 31  *
 32  */
 33 
 34 #include <linux/kernel.h>
 35 #include <linux/module.h>
 36 #include <linux/types.h>
 37 #include <linux/fcntl.h>
 38 #include <linux/interrupt.h>
 39 #include <linux/ptrace.h>
 40 #include <linux/ioport.h>
 41 #include <linux/in.h>
 42 #include <net/ip.h>
 43 #include <linux/ip.h>
 44 #include <linux/tcp.h>
 45 #include <linux/udp.h>
 46 #include <linux/slab.h>
 47 #include <linux/string.h>
 48 #include <linux/init.h>
 49 #include <linux/timer.h>
 50 #include <linux/socket.h>
 51 #include <linux/ctype.h>
 52 #include <linux/inet.h>
 53 #include <linux/bitops.h>
 54 #include <linux/io.h>
 55 #include <asm/dma.h>
 56 #include <linux/uaccess.h>
 57 #include <linux/errno.h>
 58 #include <linux/netdevice.h>
 59 #include <linux/inetdevice.h>
 60 #include <linux/igmp.h>
 61 #include <linux/etherdevice.h>
 62 #include <linux/skbuff.h>
 63 #include <net/sock.h>
 64 #include <linux/rtnetlink.h>
 65 #include <linux/smp.h>
 66 #include <linux/if_ether.h>
 67 #include <net/arp.h>
 68 #include <linux/mii.h>
 69 #include <linux/ethtool.h>
 70 #include <linux/if_vlan.h>
 71 #include <linux/if_bonding.h>
 72 #include <linux/jiffies.h>
 73 #include <linux/preempt.h>
 74 #include <net/route.h>
 75 #include <net/net_namespace.h>
 76 #include <net/netns/generic.h>
 77 #include <net/pkt_sched.h>
 78 #include <linux/rculist.h>
 79 #include <net/flow_dissector.h>
 80 #include <net/switchdev.h>
 81 #include <net/bonding.h>
 82 #include <net/bond_3ad.h>
 83 #include <net/bond_alb.h>
 84 
 85 #include "bonding_priv.h"
 86 
 87 /*---------------------------- Module parameters ----------------------------*/
 88 
 89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
 90 
 91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
 92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
 93 static int num_peer_notif = 1;
 94 static int miimon;
 95 static int updelay;
 96 static int downdelay;
 97 static int use_carrier  = 1;
 98 static char *mode;
 99 static char *primary;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *arp_all_targets;
109 static char *fail_over_mac;
110 static int all_slaves_active;
111 static struct bond_params bonding_defaults;
112 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
113 static int packets_per_slave = 1;
114 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
115 
116 module_param(max_bonds, int, 0);
117 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
118 module_param(tx_queues, int, 0);
119 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
120 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
122                                "failover event (alias of num_unsol_na)");
123 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
124 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
125                                "failover event (alias of num_grat_arp)");
126 module_param(miimon, int, 0);
127 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
128 module_param(updelay, int, 0);
129 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
130 module_param(downdelay, int, 0);
131 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
132                             "in milliseconds");
133 module_param(use_carrier, int, 0);
134 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
135                               "0 for off, 1 for on (default)");
136 module_param(mode, charp, 0);
137 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
138                        "1 for active-backup, 2 for balance-xor, "
139                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
140                        "6 for balance-alb");
141 module_param(primary, charp, 0);
142 MODULE_PARM_DESC(primary, "Primary network device to use");
143 module_param(primary_reselect, charp, 0);
144 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
145                                    "once it comes up; "
146                                    "0 for always (default), "
147                                    "1 for only if speed of primary is "
148                                    "better, "
149                                    "2 for only on active slave "
150                                    "failure");
151 module_param(lacp_rate, charp, 0);
152 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
153                             "0 for slow, 1 for fast");
154 module_param(ad_select, charp, 0);
155 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
156                             "0 for stable (default), 1 for bandwidth, "
157                             "2 for count");
158 module_param(min_links, int, 0);
159 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
160 
161 module_param(xmit_hash_policy, charp, 0);
162 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
163                                    "0 for layer 2 (default), 1 for layer 3+4, "
164                                    "2 for layer 2+3, 3 for encap layer 2+3, "
165                                    "4 for encap layer 3+4");
166 module_param(arp_interval, int, 0);
167 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
168 module_param_array(arp_ip_target, charp, NULL, 0);
169 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
170 module_param(arp_validate, charp, 0);
171 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
172                                "0 for none (default), 1 for active, "
173                                "2 for backup, 3 for all");
174 module_param(arp_all_targets, charp, 0);
175 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
176 module_param(fail_over_mac, charp, 0);
177 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
178                                 "the same MAC; 0 for none (default), "
179                                 "1 for active, 2 for follow");
180 module_param(all_slaves_active, int, 0);
181 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
182                                      "by setting active flag for all slaves; "
183                                      "0 for never (default), 1 for always.");
184 module_param(resend_igmp, int, 0);
185 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
186                               "link failure");
187 module_param(packets_per_slave, int, 0);
188 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
189                                     "mode; 0 for a random slave, 1 packet per "
190                                     "slave (default), >1 packets per slave.");
191 module_param(lp_interval, uint, 0);
192 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
193                               "the bonding driver sends learning packets to "
194                               "each slaves peer switch. The default is 1.");
195 
196 /*----------------------------- Global variables ----------------------------*/
197 
198 #ifdef CONFIG_NET_POLL_CONTROLLER
199 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
200 #endif
201 
202 unsigned int bond_net_id __read_mostly;
203 
204 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
205 static int arp_ip_count;
206 static int bond_mode    = BOND_MODE_ROUNDROBIN;
207 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
208 static int lacp_fast;
209 
210 /*-------------------------- Forward declarations ---------------------------*/
211 
212 static int bond_init(struct net_device *bond_dev);
213 static void bond_uninit(struct net_device *bond_dev);
214 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
215                                                 struct rtnl_link_stats64 *stats);
216 static void bond_slave_arr_handler(struct work_struct *work);
217 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
218                                   int mod);
219 
220 /*---------------------------- General routines -----------------------------*/
221 
222 const char *bond_mode_name(int mode)
223 {
224         static const char *names[] = {
225                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
226                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
227                 [BOND_MODE_XOR] = "load balancing (xor)",
228                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
229                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
230                 [BOND_MODE_TLB] = "transmit load balancing",
231                 [BOND_MODE_ALB] = "adaptive load balancing",
232         };
233 
234         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
235                 return "unknown";
236 
237         return names[mode];
238 }
239 
240 /*---------------------------------- VLAN -----------------------------------*/
241 
242 /**
243  * bond_dev_queue_xmit - Prepare skb for xmit.
244  *
245  * @bond: bond device that got this skb for tx.
246  * @skb: hw accel VLAN tagged skb to transmit
247  * @slave_dev: slave that is supposed to xmit this skbuff
248  */
249 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
250                         struct net_device *slave_dev)
251 {
252         skb->dev = slave_dev;
253 
254         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
255                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
256         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
257 
258         if (unlikely(netpoll_tx_running(bond->dev)))
259                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
260         else
261                 dev_queue_xmit(skb);
262 }
263 
264 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
265  * We don't protect the slave list iteration with a lock because:
266  * a. This operation is performed in IOCTL context,
267  * b. The operation is protected by the RTNL semaphore in the 8021q code,
268  * c. Holding a lock with BH disabled while directly calling a base driver
269  *    entry point is generally a BAD idea.
270  *
271  * The design of synchronization/protection for this operation in the 8021q
272  * module is good for one or more VLAN devices over a single physical device
273  * and cannot be extended for a teaming solution like bonding, so there is a
274  * potential race condition here where a net device from the vlan group might
275  * be referenced (either by a base driver or the 8021q code) while it is being
276  * removed from the system. However, it turns out we're not making matters
277  * worse, and if it works for regular VLAN usage it will work here too.
278 */
279 
280 /**
281  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
282  * @bond_dev: bonding net device that got called
283  * @vid: vlan id being added
284  */
285 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
286                                 __be16 proto, u16 vid)
287 {
288         struct bonding *bond = netdev_priv(bond_dev);
289         struct slave *slave, *rollback_slave;
290         struct list_head *iter;
291         int res;
292 
293         bond_for_each_slave(bond, slave, iter) {
294                 res = vlan_vid_add(slave->dev, proto, vid);
295                 if (res)
296                         goto unwind;
297         }
298 
299         return 0;
300 
301 unwind:
302         /* unwind to the slave that failed */
303         bond_for_each_slave(bond, rollback_slave, iter) {
304                 if (rollback_slave == slave)
305                         break;
306 
307                 vlan_vid_del(rollback_slave->dev, proto, vid);
308         }
309 
310         return res;
311 }
312 
313 /**
314  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
315  * @bond_dev: bonding net device that got called
316  * @vid: vlan id being removed
317  */
318 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
319                                  __be16 proto, u16 vid)
320 {
321         struct bonding *bond = netdev_priv(bond_dev);
322         struct list_head *iter;
323         struct slave *slave;
324 
325         bond_for_each_slave(bond, slave, iter)
326                 vlan_vid_del(slave->dev, proto, vid);
327 
328         if (bond_is_lb(bond))
329                 bond_alb_clear_vlan(bond, vid);
330 
331         return 0;
332 }
333 
334 /*------------------------------- Link status -------------------------------*/
335 
336 /* Set the carrier state for the master according to the state of its
337  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
338  * do special 802.3ad magic.
339  *
340  * Returns zero if carrier state does not change, nonzero if it does.
341  */
342 int bond_set_carrier(struct bonding *bond)
343 {
344         struct list_head *iter;
345         struct slave *slave;
346 
347         if (!bond_has_slaves(bond))
348                 goto down;
349 
350         if (BOND_MODE(bond) == BOND_MODE_8023AD)
351                 return bond_3ad_set_carrier(bond);
352 
353         bond_for_each_slave(bond, slave, iter) {
354                 if (slave->link == BOND_LINK_UP) {
355                         if (!netif_carrier_ok(bond->dev)) {
356                                 netif_carrier_on(bond->dev);
357                                 return 1;
358                         }
359                         return 0;
360                 }
361         }
362 
363 down:
364         if (netif_carrier_ok(bond->dev)) {
365                 netif_carrier_off(bond->dev);
366                 return 1;
367         }
368         return 0;
369 }
370 
371 /* Get link speed and duplex from the slave's base driver
372  * using ethtool. If for some reason the call fails or the
373  * values are invalid, set speed and duplex to -1,
374  * and return.
375  */
376 static void bond_update_speed_duplex(struct slave *slave)
377 {
378         struct net_device *slave_dev = slave->dev;
379         struct ethtool_link_ksettings ecmd;
380         int res;
381 
382         slave->speed = SPEED_UNKNOWN;
383         slave->duplex = DUPLEX_UNKNOWN;
384 
385         res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
386         if (res < 0)
387                 return;
388 
389         if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
390                 return;
391 
392         switch (ecmd.base.duplex) {
393         case DUPLEX_FULL:
394         case DUPLEX_HALF:
395                 break;
396         default:
397                 return;
398         }
399 
400         slave->speed = ecmd.base.speed;
401         slave->duplex = ecmd.base.duplex;
402 
403         return;
404 }
405 
406 const char *bond_slave_link_status(s8 link)
407 {
408         switch (link) {
409         case BOND_LINK_UP:
410                 return "up";
411         case BOND_LINK_FAIL:
412                 return "going down";
413         case BOND_LINK_DOWN:
414                 return "down";
415         case BOND_LINK_BACK:
416                 return "going back";
417         default:
418                 return "unknown";
419         }
420 }
421 
422 /* if <dev> supports MII link status reporting, check its link status.
423  *
424  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
425  * depending upon the setting of the use_carrier parameter.
426  *
427  * Return either BMSR_LSTATUS, meaning that the link is up (or we
428  * can't tell and just pretend it is), or 0, meaning that the link is
429  * down.
430  *
431  * If reporting is non-zero, instead of faking link up, return -1 if
432  * both ETHTOOL and MII ioctls fail (meaning the device does not
433  * support them).  If use_carrier is set, return whatever it says.
434  * It'd be nice if there was a good way to tell if a driver supports
435  * netif_carrier, but there really isn't.
436  */
437 static int bond_check_dev_link(struct bonding *bond,
438                                struct net_device *slave_dev, int reporting)
439 {
440         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441         int (*ioctl)(struct net_device *, struct ifreq *, int);
442         struct ifreq ifr;
443         struct mii_ioctl_data *mii;
444 
445         if (!reporting && !netif_running(slave_dev))
446                 return 0;
447 
448         if (bond->params.use_carrier)
449                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
450 
451         /* Try to get link status using Ethtool first. */
452         if (slave_dev->ethtool_ops->get_link)
453                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
454                         BMSR_LSTATUS : 0;
455 
456         /* Ethtool can't be used, fallback to MII ioctls. */
457         ioctl = slave_ops->ndo_do_ioctl;
458         if (ioctl) {
459                 /* TODO: set pointer to correct ioctl on a per team member
460                  *       bases to make this more efficient. that is, once
461                  *       we determine the correct ioctl, we will always
462                  *       call it and not the others for that team
463                  *       member.
464                  */
465 
466                 /* We cannot assume that SIOCGMIIPHY will also read a
467                  * register; not all network drivers (e.g., e100)
468                  * support that.
469                  */
470 
471                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
472                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
473                 mii = if_mii(&ifr);
474                 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
475                         mii->reg_num = MII_BMSR;
476                         if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
477                                 return mii->val_out & BMSR_LSTATUS;
478                 }
479         }
480 
481         /* If reporting, report that either there's no dev->do_ioctl,
482          * or both SIOCGMIIREG and get_link failed (meaning that we
483          * cannot report link status).  If not reporting, pretend
484          * we're ok.
485          */
486         return reporting ? -1 : BMSR_LSTATUS;
487 }
488 
489 /*----------------------------- Multicast list ------------------------------*/
490 
491 /* Push the promiscuity flag down to appropriate slaves */
492 static int bond_set_promiscuity(struct bonding *bond, int inc)
493 {
494         struct list_head *iter;
495         int err = 0;
496 
497         if (bond_uses_primary(bond)) {
498                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
499 
500                 if (curr_active)
501                         err = dev_set_promiscuity(curr_active->dev, inc);
502         } else {
503                 struct slave *slave;
504 
505                 bond_for_each_slave(bond, slave, iter) {
506                         err = dev_set_promiscuity(slave->dev, inc);
507                         if (err)
508                                 return err;
509                 }
510         }
511         return err;
512 }
513 
514 /* Push the allmulti flag down to all slaves */
515 static int bond_set_allmulti(struct bonding *bond, int inc)
516 {
517         struct list_head *iter;
518         int err = 0;
519 
520         if (bond_uses_primary(bond)) {
521                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
522 
523                 if (curr_active)
524                         err = dev_set_allmulti(curr_active->dev, inc);
525         } else {
526                 struct slave *slave;
527 
528                 bond_for_each_slave(bond, slave, iter) {
529                         err = dev_set_allmulti(slave->dev, inc);
530                         if (err)
531                                 return err;
532                 }
533         }
534         return err;
535 }
536 
537 /* Retrieve the list of registered multicast addresses for the bonding
538  * device and retransmit an IGMP JOIN request to the current active
539  * slave.
540  */
541 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
542 {
543         struct bonding *bond = container_of(work, struct bonding,
544                                             mcast_work.work);
545 
546         if (!rtnl_trylock()) {
547                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
548                 return;
549         }
550         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
551 
552         if (bond->igmp_retrans > 1) {
553                 bond->igmp_retrans--;
554                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
555         }
556         rtnl_unlock();
557 }
558 
559 /* Flush bond's hardware addresses from slave */
560 static void bond_hw_addr_flush(struct net_device *bond_dev,
561                                struct net_device *slave_dev)
562 {
563         struct bonding *bond = netdev_priv(bond_dev);
564 
565         dev_uc_unsync(slave_dev, bond_dev);
566         dev_mc_unsync(slave_dev, bond_dev);
567 
568         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
569                 /* del lacpdu mc addr from mc list */
570                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
571 
572                 dev_mc_del(slave_dev, lacpdu_multicast);
573         }
574 }
575 
576 /*--------------------------- Active slave change ---------------------------*/
577 
578 /* Update the hardware address list and promisc/allmulti for the new and
579  * old active slaves (if any).  Modes that are not using primary keep all
580  * slaves up date at all times; only the modes that use primary need to call
581  * this function to swap these settings during a failover.
582  */
583 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
584                               struct slave *old_active)
585 {
586         if (old_active) {
587                 if (bond->dev->flags & IFF_PROMISC)
588                         dev_set_promiscuity(old_active->dev, -1);
589 
590                 if (bond->dev->flags & IFF_ALLMULTI)
591                         dev_set_allmulti(old_active->dev, -1);
592 
593                 bond_hw_addr_flush(bond->dev, old_active->dev);
594         }
595 
596         if (new_active) {
597                 /* FIXME: Signal errors upstream. */
598                 if (bond->dev->flags & IFF_PROMISC)
599                         dev_set_promiscuity(new_active->dev, 1);
600 
601                 if (bond->dev->flags & IFF_ALLMULTI)
602                         dev_set_allmulti(new_active->dev, 1);
603 
604                 netif_addr_lock_bh(bond->dev);
605                 dev_uc_sync(new_active->dev, bond->dev);
606                 dev_mc_sync(new_active->dev, bond->dev);
607                 netif_addr_unlock_bh(bond->dev);
608         }
609 }
610 
611 /**
612  * bond_set_dev_addr - clone slave's address to bond
613  * @bond_dev: bond net device
614  * @slave_dev: slave net device
615  *
616  * Should be called with RTNL held.
617  */
618 static void bond_set_dev_addr(struct net_device *bond_dev,
619                               struct net_device *slave_dev)
620 {
621         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->name=%s slave_dev->addr_len=%d\n",
622                    bond_dev, slave_dev, slave_dev->name, slave_dev->addr_len);
623         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
624         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
625         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
626 }
627 
628 static struct slave *bond_get_old_active(struct bonding *bond,
629                                          struct slave *new_active)
630 {
631         struct slave *slave;
632         struct list_head *iter;
633 
634         bond_for_each_slave(bond, slave, iter) {
635                 if (slave == new_active)
636                         continue;
637 
638                 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
639                         return slave;
640         }
641 
642         return NULL;
643 }
644 
645 /* bond_do_fail_over_mac
646  *
647  * Perform special MAC address swapping for fail_over_mac settings
648  *
649  * Called with RTNL
650  */
651 static void bond_do_fail_over_mac(struct bonding *bond,
652                                   struct slave *new_active,
653                                   struct slave *old_active)
654 {
655         u8 tmp_mac[ETH_ALEN];
656         struct sockaddr saddr;
657         int rv;
658 
659         switch (bond->params.fail_over_mac) {
660         case BOND_FOM_ACTIVE:
661                 if (new_active)
662                         bond_set_dev_addr(bond->dev, new_active->dev);
663                 break;
664         case BOND_FOM_FOLLOW:
665                 /* if new_active && old_active, swap them
666                  * if just old_active, do nothing (going to no active slave)
667                  * if just new_active, set new_active to bond's MAC
668                  */
669                 if (!new_active)
670                         return;
671 
672                 if (!old_active)
673                         old_active = bond_get_old_active(bond, new_active);
674 
675                 if (old_active) {
676                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
677                         ether_addr_copy(saddr.sa_data,
678                                         old_active->dev->dev_addr);
679                         saddr.sa_family = new_active->dev->type;
680                 } else {
681                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
682                         saddr.sa_family = bond->dev->type;
683                 }
684 
685                 rv = dev_set_mac_address(new_active->dev, &saddr);
686                 if (rv) {
687                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
688                                    -rv, new_active->dev->name);
689                         goto out;
690                 }
691 
692                 if (!old_active)
693                         goto out;
694 
695                 ether_addr_copy(saddr.sa_data, tmp_mac);
696                 saddr.sa_family = old_active->dev->type;
697 
698                 rv = dev_set_mac_address(old_active->dev, &saddr);
699                 if (rv)
700                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
701                                    -rv, new_active->dev->name);
702 out:
703                 break;
704         default:
705                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
706                            bond->params.fail_over_mac);
707                 break;
708         }
709 
710 }
711 
712 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
713 {
714         struct slave *prim = rtnl_dereference(bond->primary_slave);
715         struct slave *curr = rtnl_dereference(bond->curr_active_slave);
716 
717         if (!prim || prim->link != BOND_LINK_UP) {
718                 if (!curr || curr->link != BOND_LINK_UP)
719                         return NULL;
720                 return curr;
721         }
722 
723         if (bond->force_primary) {
724                 bond->force_primary = false;
725                 return prim;
726         }
727 
728         if (!curr || curr->link != BOND_LINK_UP)
729                 return prim;
730 
731         /* At this point, prim and curr are both up */
732         switch (bond->params.primary_reselect) {
733         case BOND_PRI_RESELECT_ALWAYS:
734                 return prim;
735         case BOND_PRI_RESELECT_BETTER:
736                 if (prim->speed < curr->speed)
737                         return curr;
738                 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
739                         return curr;
740                 return prim;
741         case BOND_PRI_RESELECT_FAILURE:
742                 return curr;
743         default:
744                 netdev_err(bond->dev, "impossible primary_reselect %d\n",
745                            bond->params.primary_reselect);
746                 return curr;
747         }
748 }
749 
750 /**
751  * bond_find_best_slave - select the best available slave to be the active one
752  * @bond: our bonding struct
753  */
754 static struct slave *bond_find_best_slave(struct bonding *bond)
755 {
756         struct slave *slave, *bestslave = NULL;
757         struct list_head *iter;
758         int mintime = bond->params.updelay;
759 
760         slave = bond_choose_primary_or_current(bond);
761         if (slave)
762                 return slave;
763 
764         bond_for_each_slave(bond, slave, iter) {
765                 if (slave->link == BOND_LINK_UP)
766                         return slave;
767                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
768                     slave->delay < mintime) {
769                         mintime = slave->delay;
770                         bestslave = slave;
771                 }
772         }
773 
774         return bestslave;
775 }
776 
777 static bool bond_should_notify_peers(struct bonding *bond)
778 {
779         struct slave *slave;
780 
781         rcu_read_lock();
782         slave = rcu_dereference(bond->curr_active_slave);
783         rcu_read_unlock();
784 
785         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
786                    slave ? slave->dev->name : "NULL");
787 
788         if (!slave || !bond->send_peer_notif ||
789             !netif_carrier_ok(bond->dev) ||
790             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
791                 return false;
792 
793         return true;
794 }
795 
796 /**
797  * change_active_interface - change the active slave into the specified one
798  * @bond: our bonding struct
799  * @new: the new slave to make the active one
800  *
801  * Set the new slave to the bond's settings and unset them on the old
802  * curr_active_slave.
803  * Setting include flags, mc-list, promiscuity, allmulti, etc.
804  *
805  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
806  * because it is apparently the best available slave we have, even though its
807  * updelay hasn't timed out yet.
808  *
809  * Caller must hold RTNL.
810  */
811 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
812 {
813         struct slave *old_active;
814 
815         ASSERT_RTNL();
816 
817         old_active = rtnl_dereference(bond->curr_active_slave);
818 
819         if (old_active == new_active)
820                 return;
821 
822         if (new_active) {
823                 new_active->last_link_up = jiffies;
824 
825                 if (new_active->link == BOND_LINK_BACK) {
826                         if (bond_uses_primary(bond)) {
827                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
828                                             new_active->dev->name,
829                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
830                         }
831 
832                         new_active->delay = 0;
833                         bond_set_slave_link_state(new_active, BOND_LINK_UP,
834                                                   BOND_SLAVE_NOTIFY_NOW);
835 
836                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
837                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
838 
839                         if (bond_is_lb(bond))
840                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
841                 } else {
842                         if (bond_uses_primary(bond)) {
843                                 netdev_info(bond->dev, "making interface %s the new active one\n",
844                                             new_active->dev->name);
845                         }
846                 }
847         }
848 
849         if (bond_uses_primary(bond))
850                 bond_hw_addr_swap(bond, new_active, old_active);
851 
852         if (bond_is_lb(bond)) {
853                 bond_alb_handle_active_change(bond, new_active);
854                 if (old_active)
855                         bond_set_slave_inactive_flags(old_active,
856                                                       BOND_SLAVE_NOTIFY_NOW);
857                 if (new_active)
858                         bond_set_slave_active_flags(new_active,
859                                                     BOND_SLAVE_NOTIFY_NOW);
860         } else {
861                 rcu_assign_pointer(bond->curr_active_slave, new_active);
862         }
863 
864         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
865                 if (old_active)
866                         bond_set_slave_inactive_flags(old_active,
867                                                       BOND_SLAVE_NOTIFY_NOW);
868 
869                 if (new_active) {
870                         bool should_notify_peers = false;
871 
872                         bond_set_slave_active_flags(new_active,
873                                                     BOND_SLAVE_NOTIFY_NOW);
874 
875                         if (bond->params.fail_over_mac)
876                                 bond_do_fail_over_mac(bond, new_active,
877                                                       old_active);
878 
879                         if (netif_running(bond->dev)) {
880                                 bond->send_peer_notif =
881                                         bond->params.num_peer_notif;
882                                 should_notify_peers =
883                                         bond_should_notify_peers(bond);
884                         }
885 
886                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
887                         if (should_notify_peers)
888                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
889                                                          bond->dev);
890                 }
891         }
892 
893         /* resend IGMP joins since active slave has changed or
894          * all were sent on curr_active_slave.
895          * resend only if bond is brought up with the affected
896          * bonding modes and the retransmission is enabled
897          */
898         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
899             ((bond_uses_primary(bond) && new_active) ||
900              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
901                 bond->igmp_retrans = bond->params.resend_igmp;
902                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
903         }
904 }
905 
906 /**
907  * bond_select_active_slave - select a new active slave, if needed
908  * @bond: our bonding struct
909  *
910  * This functions should be called when one of the following occurs:
911  * - The old curr_active_slave has been released or lost its link.
912  * - The primary_slave has got its link back.
913  * - A slave has got its link back and there's no old curr_active_slave.
914  *
915  * Caller must hold RTNL.
916  */
917 void bond_select_active_slave(struct bonding *bond)
918 {
919         struct slave *best_slave;
920         int rv;
921 
922         ASSERT_RTNL();
923 
924         best_slave = bond_find_best_slave(bond);
925         if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
926                 bond_change_active_slave(bond, best_slave);
927                 rv = bond_set_carrier(bond);
928                 if (!rv)
929                         return;
930 
931                 if (netif_carrier_ok(bond->dev))
932                         netdev_info(bond->dev, "first active interface up!\n");
933                 else
934                         netdev_info(bond->dev, "now running without any active interface!\n");
935         }
936 }
937 
938 #ifdef CONFIG_NET_POLL_CONTROLLER
939 static inline int slave_enable_netpoll(struct slave *slave)
940 {
941         struct netpoll *np;
942         int err = 0;
943 
944         np = kzalloc(sizeof(*np), GFP_KERNEL);
945         err = -ENOMEM;
946         if (!np)
947                 goto out;
948 
949         err = __netpoll_setup(np, slave->dev);
950         if (err) {
951                 kfree(np);
952                 goto out;
953         }
954         slave->np = np;
955 out:
956         return err;
957 }
958 static inline void slave_disable_netpoll(struct slave *slave)
959 {
960         struct netpoll *np = slave->np;
961 
962         if (!np)
963                 return;
964 
965         slave->np = NULL;
966         __netpoll_free_async(np);
967 }
968 
969 static void bond_poll_controller(struct net_device *bond_dev)
970 {
971         struct bonding *bond = netdev_priv(bond_dev);
972         struct slave *slave = NULL;
973         struct list_head *iter;
974         struct ad_info ad_info;
975         struct netpoll_info *ni;
976         const struct net_device_ops *ops;
977 
978         if (BOND_MODE(bond) == BOND_MODE_8023AD)
979                 if (bond_3ad_get_active_agg_info(bond, &ad_info))
980                         return;
981 
982         bond_for_each_slave_rcu(bond, slave, iter) {
983                 ops = slave->dev->netdev_ops;
984                 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
985                         continue;
986 
987                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
988                         struct aggregator *agg =
989                             SLAVE_AD_INFO(slave)->port.aggregator;
990 
991                         if (agg &&
992                             agg->aggregator_identifier != ad_info.aggregator_id)
993                                 continue;
994                 }
995 
996                 ni = rcu_dereference_bh(slave->dev->npinfo);
997                 if (down_trylock(&ni->dev_lock))
998                         continue;
999                 ops->ndo_poll_controller(slave->dev);
1000                 up(&ni->dev_lock);
1001         }
1002 }
1003 
1004 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1005 {
1006         struct bonding *bond = netdev_priv(bond_dev);
1007         struct list_head *iter;
1008         struct slave *slave;
1009 
1010         bond_for_each_slave(bond, slave, iter)
1011                 if (bond_slave_is_up(slave))
1012                         slave_disable_netpoll(slave);
1013 }
1014 
1015 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1016 {
1017         struct bonding *bond = netdev_priv(dev);
1018         struct list_head *iter;
1019         struct slave *slave;
1020         int err = 0;
1021 
1022         bond_for_each_slave(bond, slave, iter) {
1023                 err = slave_enable_netpoll(slave);
1024                 if (err) {
1025                         bond_netpoll_cleanup(dev);
1026                         break;
1027                 }
1028         }
1029         return err;
1030 }
1031 #else
1032 static inline int slave_enable_netpoll(struct slave *slave)
1033 {
1034         return 0;
1035 }
1036 static inline void slave_disable_netpoll(struct slave *slave)
1037 {
1038 }
1039 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1040 {
1041 }
1042 #endif
1043 
1044 /*---------------------------------- IOCTL ----------------------------------*/
1045 
1046 static netdev_features_t bond_fix_features(struct net_device *dev,
1047                                            netdev_features_t features)
1048 {
1049         struct bonding *bond = netdev_priv(dev);
1050         struct list_head *iter;
1051         netdev_features_t mask;
1052         struct slave *slave;
1053 
1054         mask = features;
1055 
1056         features &= ~NETIF_F_ONE_FOR_ALL;
1057         features |= NETIF_F_ALL_FOR_ALL;
1058 
1059         bond_for_each_slave(bond, slave, iter) {
1060                 features = netdev_increment_features(features,
1061                                                      slave->dev->features,
1062                                                      mask);
1063         }
1064         features = netdev_add_tso_features(features, mask);
1065 
1066         return features;
1067 }
1068 
1069 #define BOND_VLAN_FEATURES      (NETIF_F_HW_CSUM | NETIF_F_SG | \
1070                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1071                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1072 
1073 #define BOND_ENC_FEATURES       (NETIF_F_HW_CSUM | NETIF_F_SG | \
1074                                  NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1075 
1076 static void bond_compute_features(struct bonding *bond)
1077 {
1078         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1079                                         IFF_XMIT_DST_RELEASE_PERM;
1080         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1081         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1082         struct net_device *bond_dev = bond->dev;
1083         struct list_head *iter;
1084         struct slave *slave;
1085         unsigned short max_hard_header_len = ETH_HLEN;
1086         unsigned int gso_max_size = GSO_MAX_SIZE;
1087         u16 gso_max_segs = GSO_MAX_SEGS;
1088 
1089         if (!bond_has_slaves(bond))
1090                 goto done;
1091         vlan_features &= NETIF_F_ALL_FOR_ALL;
1092 
1093         bond_for_each_slave(bond, slave, iter) {
1094                 vlan_features = netdev_increment_features(vlan_features,
1095                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1096 
1097                 enc_features = netdev_increment_features(enc_features,
1098                                                          slave->dev->hw_enc_features,
1099                                                          BOND_ENC_FEATURES);
1100                 dst_release_flag &= slave->dev->priv_flags;
1101                 if (slave->dev->hard_header_len > max_hard_header_len)
1102                         max_hard_header_len = slave->dev->hard_header_len;
1103 
1104                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1105                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1106         }
1107 
1108 done:
1109         bond_dev->vlan_features = vlan_features;
1110         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1111         bond_dev->hard_header_len = max_hard_header_len;
1112         bond_dev->gso_max_segs = gso_max_segs;
1113         netif_set_gso_max_size(bond_dev, gso_max_size);
1114 
1115         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1116         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1117             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1118                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1119 
1120         netdev_change_features(bond_dev);
1121 }
1122 
1123 static void bond_setup_by_slave(struct net_device *bond_dev,
1124                                 struct net_device *slave_dev)
1125 {
1126         bond_dev->header_ops        = slave_dev->header_ops;
1127 
1128         bond_dev->type              = slave_dev->type;
1129         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1130         bond_dev->addr_len          = slave_dev->addr_len;
1131 
1132         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1133                 slave_dev->addr_len);
1134 }
1135 
1136 /* On bonding slaves other than the currently active slave, suppress
1137  * duplicates except for alb non-mcast/bcast.
1138  */
1139 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1140                                             struct slave *slave,
1141                                             struct bonding *bond)
1142 {
1143         if (bond_is_slave_inactive(slave)) {
1144                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1145                     skb->pkt_type != PACKET_BROADCAST &&
1146                     skb->pkt_type != PACKET_MULTICAST)
1147                         return false;
1148                 return true;
1149         }
1150         return false;
1151 }
1152 
1153 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1154 {
1155         struct sk_buff *skb = *pskb;
1156         struct slave *slave;
1157         struct bonding *bond;
1158         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1159                           struct slave *);
1160         int ret = RX_HANDLER_ANOTHER;
1161 
1162         skb = skb_share_check(skb, GFP_ATOMIC);
1163         if (unlikely(!skb))
1164                 return RX_HANDLER_CONSUMED;
1165 
1166         *pskb = skb;
1167 
1168         slave = bond_slave_get_rcu(skb->dev);
1169         bond = slave->bond;
1170 
1171         recv_probe = ACCESS_ONCE(bond->recv_probe);
1172         if (recv_probe) {
1173                 ret = recv_probe(skb, bond, slave);
1174                 if (ret == RX_HANDLER_CONSUMED) {
1175                         consume_skb(skb);
1176                         return ret;
1177                 }
1178         }
1179 
1180         if (bond_should_deliver_exact_match(skb, slave, bond))
1181                 return RX_HANDLER_EXACT;
1182 
1183         skb->dev = bond->dev;
1184 
1185         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1186             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1187             skb->pkt_type == PACKET_HOST) {
1188 
1189                 if (unlikely(skb_cow_head(skb,
1190                                           skb->data - skb_mac_header(skb)))) {
1191                         kfree_skb(skb);
1192                         return RX_HANDLER_CONSUMED;
1193                 }
1194                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1195         }
1196 
1197         return ret;
1198 }
1199 
1200 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1201 {
1202         switch (BOND_MODE(bond)) {
1203         case BOND_MODE_ROUNDROBIN:
1204                 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1205         case BOND_MODE_ACTIVEBACKUP:
1206                 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1207         case BOND_MODE_BROADCAST:
1208                 return NETDEV_LAG_TX_TYPE_BROADCAST;
1209         case BOND_MODE_XOR:
1210         case BOND_MODE_8023AD:
1211                 return NETDEV_LAG_TX_TYPE_HASH;
1212         default:
1213                 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1214         }
1215 }
1216 
1217 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave)
1218 {
1219         struct netdev_lag_upper_info lag_upper_info;
1220         int err;
1221 
1222         lag_upper_info.tx_type = bond_lag_tx_type(bond);
1223         err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1224                                            &lag_upper_info);
1225         if (err)
1226                 return err;
1227         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1228         return 0;
1229 }
1230 
1231 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1232 {
1233         netdev_upper_dev_unlink(slave->dev, bond->dev);
1234         slave->dev->flags &= ~IFF_SLAVE;
1235         rtmsg_ifinfo(RTM_NEWLINK, slave->dev, IFF_SLAVE, GFP_KERNEL);
1236 }
1237 
1238 static struct slave *bond_alloc_slave(struct bonding *bond)
1239 {
1240         struct slave *slave = NULL;
1241 
1242         slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1243         if (!slave)
1244                 return NULL;
1245 
1246         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1247                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1248                                                GFP_KERNEL);
1249                 if (!SLAVE_AD_INFO(slave)) {
1250                         kfree(slave);
1251                         return NULL;
1252                 }
1253         }
1254         return slave;
1255 }
1256 
1257 static void bond_free_slave(struct slave *slave)
1258 {
1259         struct bonding *bond = bond_get_bond_by_slave(slave);
1260 
1261         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1262                 kfree(SLAVE_AD_INFO(slave));
1263 
1264         kfree(slave);
1265 }
1266 
1267 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1268 {
1269         info->bond_mode = BOND_MODE(bond);
1270         info->miimon = bond->params.miimon;
1271         info->num_slaves = bond->slave_cnt;
1272 }
1273 
1274 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1275 {
1276         strcpy(info->slave_name, slave->dev->name);
1277         info->link = slave->link;
1278         info->state = bond_slave_state(slave);
1279         info->link_failure_count = slave->link_failure_count;
1280 }
1281 
1282 static void bond_netdev_notify(struct net_device *dev,
1283                                struct netdev_bonding_info *info)
1284 {
1285         rtnl_lock();
1286         netdev_bonding_info_change(dev, info);
1287         rtnl_unlock();
1288 }
1289 
1290 static void bond_netdev_notify_work(struct work_struct *_work)
1291 {
1292         struct netdev_notify_work *w =
1293                 container_of(_work, struct netdev_notify_work, work.work);
1294 
1295         bond_netdev_notify(w->dev, &w->bonding_info);
1296         dev_put(w->dev);
1297         kfree(w);
1298 }
1299 
1300 void bond_queue_slave_event(struct slave *slave)
1301 {
1302         struct bonding *bond = slave->bond;
1303         struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1304 
1305         if (!nnw)
1306                 return;
1307 
1308         dev_hold(slave->dev);
1309         nnw->dev = slave->dev;
1310         bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1311         bond_fill_ifbond(bond, &nnw->bonding_info.master);
1312         INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1313 
1314         queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1315 }
1316 
1317 void bond_lower_state_changed(struct slave *slave)
1318 {
1319         struct netdev_lag_lower_state_info info;
1320 
1321         info.link_up = slave->link == BOND_LINK_UP ||
1322                        slave->link == BOND_LINK_FAIL;
1323         info.tx_enabled = bond_is_active_slave(slave);
1324         netdev_lower_state_changed(slave->dev, &info);
1325 }
1326 
1327 /* enslave device <slave> to bond device <master> */
1328 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1329 {
1330         struct bonding *bond = netdev_priv(bond_dev);
1331         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1332         struct slave *new_slave = NULL, *prev_slave;
1333         struct sockaddr addr;
1334         int link_reporting;
1335         int res = 0, i;
1336 
1337         if (!bond->params.use_carrier &&
1338             slave_dev->ethtool_ops->get_link == NULL &&
1339             slave_ops->ndo_do_ioctl == NULL) {
1340                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1341                             slave_dev->name);
1342         }
1343 
1344         /* already in-use? */
1345         if (netdev_is_rx_handler_busy(slave_dev)) {
1346                 netdev_err(bond_dev,
1347                            "Error: Device is in use and cannot be enslaved\n");
1348                 return -EBUSY;
1349         }
1350 
1351         if (bond_dev == slave_dev) {
1352                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1353                 return -EPERM;
1354         }
1355 
1356         /* vlan challenged mutual exclusion */
1357         /* no need to lock since we're protected by rtnl_lock */
1358         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1359                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1360                            slave_dev->name);
1361                 if (vlan_uses_dev(bond_dev)) {
1362                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1363                                    slave_dev->name, bond_dev->name);
1364                         return -EPERM;
1365                 } else {
1366                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1367                                     slave_dev->name, slave_dev->name,
1368                                     bond_dev->name);
1369                 }
1370         } else {
1371                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1372                            slave_dev->name);
1373         }
1374 
1375         /* Old ifenslave binaries are no longer supported.  These can
1376          * be identified with moderate accuracy by the state of the slave:
1377          * the current ifenslave will set the interface down prior to
1378          * enslaving it; the old ifenslave will not.
1379          */
1380         if (slave_dev->flags & IFF_UP) {
1381                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1382                            slave_dev->name);
1383                 return -EPERM;
1384         }
1385 
1386         /* set bonding device ether type by slave - bonding netdevices are
1387          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1388          * there is a need to override some of the type dependent attribs/funcs.
1389          *
1390          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1391          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1392          */
1393         if (!bond_has_slaves(bond)) {
1394                 if (bond_dev->type != slave_dev->type) {
1395                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1396                                    bond_dev->type, slave_dev->type);
1397 
1398                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1399                                                        bond_dev);
1400                         res = notifier_to_errno(res);
1401                         if (res) {
1402                                 netdev_err(bond_dev, "refused to change device type\n");
1403                                 return -EBUSY;
1404                         }
1405 
1406                         /* Flush unicast and multicast addresses */
1407                         dev_uc_flush(bond_dev);
1408                         dev_mc_flush(bond_dev);
1409 
1410                         if (slave_dev->type != ARPHRD_ETHER)
1411                                 bond_setup_by_slave(bond_dev, slave_dev);
1412                         else {
1413                                 ether_setup(bond_dev);
1414                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1415                         }
1416 
1417                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1418                                                  bond_dev);
1419                 }
1420         } else if (bond_dev->type != slave_dev->type) {
1421                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1422                            slave_dev->name, slave_dev->type, bond_dev->type);
1423                 return -EINVAL;
1424         }
1425 
1426         if (slave_dev->type == ARPHRD_INFINIBAND &&
1427             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1428                 netdev_warn(bond_dev, "Type (%d) supports only active-backup mode\n",
1429                             slave_dev->type);
1430                 res = -EOPNOTSUPP;
1431                 goto err_undo_flags;
1432         }
1433 
1434         if (!slave_ops->ndo_set_mac_address ||
1435             slave_dev->type == ARPHRD_INFINIBAND) {
1436                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1437                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1438                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1439                         if (!bond_has_slaves(bond)) {
1440                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1441                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1442                         } else {
1443                                 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1444                                 res = -EOPNOTSUPP;
1445                                 goto err_undo_flags;
1446                         }
1447                 }
1448         }
1449 
1450         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1451 
1452         /* If this is the first slave, then we need to set the master's hardware
1453          * address to be the same as the slave's.
1454          */
1455         if (!bond_has_slaves(bond) &&
1456             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1457                 bond_set_dev_addr(bond->dev, slave_dev);
1458 
1459         new_slave = bond_alloc_slave(bond);
1460         if (!new_slave) {
1461                 res = -ENOMEM;
1462                 goto err_undo_flags;
1463         }
1464 
1465         new_slave->bond = bond;
1466         new_slave->dev = slave_dev;
1467         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1468          * is set via sysfs or module option if desired.
1469          */
1470         new_slave->queue_id = 0;
1471 
1472         /* Save slave's original mtu and then set it to match the bond */
1473         new_slave->original_mtu = slave_dev->mtu;
1474         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1475         if (res) {
1476                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1477                 goto err_free;
1478         }
1479 
1480         /* Save slave's original ("permanent") mac address for modes
1481          * that need it, and for restoring it upon release, and then
1482          * set it to the master's address
1483          */
1484         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1485 
1486         if (!bond->params.fail_over_mac ||
1487             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1488                 /* Set slave to master's mac address.  The application already
1489                  * set the master's mac address to that of the first slave
1490                  */
1491                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1492                 addr.sa_family = slave_dev->type;
1493                 res = dev_set_mac_address(slave_dev, &addr);
1494                 if (res) {
1495                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1496                         goto err_restore_mtu;
1497                 }
1498         }
1499 
1500         /* set slave flag before open to prevent IPv6 addrconf */
1501         slave_dev->flags |= IFF_SLAVE;
1502 
1503         /* open the slave since the application closed it */
1504         res = dev_open(slave_dev);
1505         if (res) {
1506                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1507                 goto err_restore_mac;
1508         }
1509 
1510         slave_dev->priv_flags |= IFF_BONDING;
1511         /* initialize slave stats */
1512         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1513 
1514         if (bond_is_lb(bond)) {
1515                 /* bond_alb_init_slave() must be called before all other stages since
1516                  * it might fail and we do not want to have to undo everything
1517                  */
1518                 res = bond_alb_init_slave(bond, new_slave);
1519                 if (res)
1520                         goto err_close;
1521         }
1522 
1523         /* If the mode uses primary, then the following is handled by
1524          * bond_change_active_slave().
1525          */
1526         if (!bond_uses_primary(bond)) {
1527                 /* set promiscuity level to new slave */
1528                 if (bond_dev->flags & IFF_PROMISC) {
1529                         res = dev_set_promiscuity(slave_dev, 1);
1530                         if (res)
1531                                 goto err_close;
1532                 }
1533 
1534                 /* set allmulti level to new slave */
1535                 if (bond_dev->flags & IFF_ALLMULTI) {
1536                         res = dev_set_allmulti(slave_dev, 1);
1537                         if (res)
1538                                 goto err_close;
1539                 }
1540 
1541                 netif_addr_lock_bh(bond_dev);
1542 
1543                 dev_mc_sync_multiple(slave_dev, bond_dev);
1544                 dev_uc_sync_multiple(slave_dev, bond_dev);
1545 
1546                 netif_addr_unlock_bh(bond_dev);
1547         }
1548 
1549         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1550                 /* add lacpdu mc addr to mc list */
1551                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1552 
1553                 dev_mc_add(slave_dev, lacpdu_multicast);
1554         }
1555 
1556         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1557         if (res) {
1558                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1559                            slave_dev->name);
1560                 goto err_close;
1561         }
1562 
1563         prev_slave = bond_last_slave(bond);
1564 
1565         new_slave->delay = 0;
1566         new_slave->link_failure_count = 0;
1567 
1568         bond_update_speed_duplex(new_slave);
1569 
1570         new_slave->last_rx = jiffies -
1571                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1572         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1573                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1574 
1575         if (bond->params.miimon && !bond->params.use_carrier) {
1576                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1577 
1578                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1579                         /* miimon is set but a bonded network driver
1580                          * does not support ETHTOOL/MII and
1581                          * arp_interval is not set.  Note: if
1582                          * use_carrier is enabled, we will never go
1583                          * here (because netif_carrier is always
1584                          * supported); thus, we don't need to change
1585                          * the messages for netif_carrier.
1586                          */
1587                         netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1588                                     slave_dev->name);
1589                 } else if (link_reporting == -1) {
1590                         /* unable get link status using mii/ethtool */
1591                         netdev_warn(bond_dev, "can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n",
1592                                     slave_dev->name);
1593                 }
1594         }
1595 
1596         /* check for initial state */
1597         new_slave->link = BOND_LINK_NOCHANGE;
1598         if (bond->params.miimon) {
1599                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1600                         if (bond->params.updelay) {
1601                                 bond_set_slave_link_state(new_slave,
1602                                                           BOND_LINK_BACK,
1603                                                           BOND_SLAVE_NOTIFY_NOW);
1604                                 new_slave->delay = bond->params.updelay;
1605                         } else {
1606                                 bond_set_slave_link_state(new_slave,
1607                                                           BOND_LINK_UP,
1608                                                           BOND_SLAVE_NOTIFY_NOW);
1609                         }
1610                 } else {
1611                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1612                                                   BOND_SLAVE_NOTIFY_NOW);
1613                 }
1614         } else if (bond->params.arp_interval) {
1615                 bond_set_slave_link_state(new_slave,
1616                                           (netif_carrier_ok(slave_dev) ?
1617                                           BOND_LINK_UP : BOND_LINK_DOWN),
1618                                           BOND_SLAVE_NOTIFY_NOW);
1619         } else {
1620                 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1621                                           BOND_SLAVE_NOTIFY_NOW);
1622         }
1623 
1624         if (new_slave->link != BOND_LINK_DOWN)
1625                 new_slave->last_link_up = jiffies;
1626         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1627                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1628                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1629 
1630         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1631                 /* if there is a primary slave, remember it */
1632                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1633                         rcu_assign_pointer(bond->primary_slave, new_slave);
1634                         bond->force_primary = true;
1635                 }
1636         }
1637 
1638         switch (BOND_MODE(bond)) {
1639         case BOND_MODE_ACTIVEBACKUP:
1640                 bond_set_slave_inactive_flags(new_slave,
1641                                               BOND_SLAVE_NOTIFY_NOW);
1642                 break;
1643         case BOND_MODE_8023AD:
1644                 /* in 802.3ad mode, the internal mechanism
1645                  * will activate the slaves in the selected
1646                  * aggregator
1647                  */
1648                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1649                 /* if this is the first slave */
1650                 if (!prev_slave) {
1651                         SLAVE_AD_INFO(new_slave)->id = 1;
1652                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1653                          * can be called only after the mac address of the bond is set
1654                          */
1655                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1656                 } else {
1657                         SLAVE_AD_INFO(new_slave)->id =
1658                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1659                 }
1660 
1661                 bond_3ad_bind_slave(new_slave);
1662                 break;
1663         case BOND_MODE_TLB:
1664         case BOND_MODE_ALB:
1665                 bond_set_active_slave(new_slave);
1666                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1667                 break;
1668         default:
1669                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1670 
1671                 /* always active in trunk mode */
1672                 bond_set_active_slave(new_slave);
1673 
1674                 /* In trunking mode there is little meaning to curr_active_slave
1675                  * anyway (it holds no special properties of the bond device),
1676                  * so we can change it without calling change_active_interface()
1677                  */
1678                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1679                     new_slave->link == BOND_LINK_UP)
1680                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1681 
1682                 break;
1683         } /* switch(bond_mode) */
1684 
1685 #ifdef CONFIG_NET_POLL_CONTROLLER
1686         slave_dev->npinfo = bond->dev->npinfo;
1687         if (slave_dev->npinfo) {
1688                 if (slave_enable_netpoll(new_slave)) {
1689                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1690                         res = -EBUSY;
1691                         goto err_detach;
1692                 }
1693         }
1694 #endif
1695 
1696         if (!(bond_dev->features & NETIF_F_LRO))
1697                 dev_disable_lro(slave_dev);
1698 
1699         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1700                                          new_slave);
1701         if (res) {
1702                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1703                 goto err_detach;
1704         }
1705 
1706         res = bond_master_upper_dev_link(bond, new_slave);
1707         if (res) {
1708                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1709                 goto err_unregister;
1710         }
1711 
1712         res = bond_sysfs_slave_add(new_slave);
1713         if (res) {
1714                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1715                 goto err_upper_unlink;
1716         }
1717 
1718         bond->slave_cnt++;
1719         bond_compute_features(bond);
1720         bond_set_carrier(bond);
1721 
1722         if (bond_uses_primary(bond)) {
1723                 block_netpoll_tx();
1724                 bond_select_active_slave(bond);
1725                 unblock_netpoll_tx();
1726         }
1727 
1728         if (bond_mode_uses_xmit_hash(bond))
1729                 bond_update_slave_arr(bond, NULL);
1730 
1731         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1732                     slave_dev->name,
1733                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1734                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1735 
1736         /* enslave is successful */
1737         bond_queue_slave_event(new_slave);
1738         return 0;
1739 
1740 /* Undo stages on error */
1741 err_upper_unlink:
1742         bond_upper_dev_unlink(bond, new_slave);
1743 
1744 err_unregister:
1745         netdev_rx_handler_unregister(slave_dev);
1746 
1747 err_detach:
1748         if (!bond_uses_primary(bond))
1749                 bond_hw_addr_flush(bond_dev, slave_dev);
1750 
1751         vlan_vids_del_by_dev(slave_dev, bond_dev);
1752         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1753                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1754         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1755                 block_netpoll_tx();
1756                 bond_change_active_slave(bond, NULL);
1757                 bond_select_active_slave(bond);
1758                 unblock_netpoll_tx();
1759         }
1760         /* either primary_slave or curr_active_slave might've changed */
1761         synchronize_rcu();
1762         slave_disable_netpoll(new_slave);
1763 
1764 err_close:
1765         slave_dev->priv_flags &= ~IFF_BONDING;
1766         dev_close(slave_dev);
1767 
1768 err_restore_mac:
1769         slave_dev->flags &= ~IFF_SLAVE;
1770         if (!bond->params.fail_over_mac ||
1771             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1772                 /* XXX TODO - fom follow mode needs to change master's
1773                  * MAC if this slave's MAC is in use by the bond, or at
1774                  * least print a warning.
1775                  */
1776                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1777                 addr.sa_family = slave_dev->type;
1778                 dev_set_mac_address(slave_dev, &addr);
1779         }
1780 
1781 err_restore_mtu:
1782         dev_set_mtu(slave_dev, new_slave->original_mtu);
1783 
1784 err_free:
1785         bond_free_slave(new_slave);
1786 
1787 err_undo_flags:
1788         /* Enslave of first slave has failed and we need to fix master's mac */
1789         if (!bond_has_slaves(bond)) {
1790                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1791                                             slave_dev->dev_addr))
1792                         eth_hw_addr_random(bond_dev);
1793                 if (bond_dev->type != ARPHRD_ETHER) {
1794                         dev_close(bond_dev);
1795                         ether_setup(bond_dev);
1796                         bond_dev->flags |= IFF_MASTER;
1797                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1798                 }
1799         }
1800 
1801         return res;
1802 }
1803 
1804 /* Try to release the slave device <slave> from the bond device <master>
1805  * It is legal to access curr_active_slave without a lock because all the function
1806  * is RTNL-locked. If "all" is true it means that the function is being called
1807  * while destroying a bond interface and all slaves are being released.
1808  *
1809  * The rules for slave state should be:
1810  *   for Active/Backup:
1811  *     Active stays on all backups go down
1812  *   for Bonded connections:
1813  *     The first up interface should be left on and all others downed.
1814  */
1815 static int __bond_release_one(struct net_device *bond_dev,
1816                               struct net_device *slave_dev,
1817                               bool all)
1818 {
1819         struct bonding *bond = netdev_priv(bond_dev);
1820         struct slave *slave, *oldcurrent;
1821         struct sockaddr addr;
1822         int old_flags = bond_dev->flags;
1823         netdev_features_t old_features = bond_dev->features;
1824 
1825         /* slave is not a slave or master is not master of this slave */
1826         if (!(slave_dev->flags & IFF_SLAVE) ||
1827             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1828                 netdev_dbg(bond_dev, "cannot release %s\n",
1829                            slave_dev->name);
1830                 return -EINVAL;
1831         }
1832 
1833         block_netpoll_tx();
1834 
1835         slave = bond_get_slave_by_dev(bond, slave_dev);
1836         if (!slave) {
1837                 /* not a slave of this bond */
1838                 netdev_info(bond_dev, "%s not enslaved\n",
1839                             slave_dev->name);
1840                 unblock_netpoll_tx();
1841                 return -EINVAL;
1842         }
1843 
1844         bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1845 
1846         bond_sysfs_slave_del(slave);
1847 
1848         /* recompute stats just before removing the slave */
1849         bond_get_stats(bond->dev, &bond->bond_stats);
1850 
1851         bond_upper_dev_unlink(bond, slave);
1852         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1853          * for this slave anymore.
1854          */
1855         netdev_rx_handler_unregister(slave_dev);
1856 
1857         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1858                 bond_3ad_unbind_slave(slave);
1859 
1860         if (bond_mode_uses_xmit_hash(bond))
1861                 bond_update_slave_arr(bond, slave);
1862 
1863         netdev_info(bond_dev, "Releasing %s interface %s\n",
1864                     bond_is_active_slave(slave) ? "active" : "backup",
1865                     slave_dev->name);
1866 
1867         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1868 
1869         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1870 
1871         if (!all && (!bond->params.fail_over_mac ||
1872                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1873                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1874                     bond_has_slaves(bond))
1875                         netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
1876                                     slave_dev->name, slave->perm_hwaddr,
1877                                     bond_dev->name, slave_dev->name);
1878         }
1879 
1880         if (rtnl_dereference(bond->primary_slave) == slave)
1881                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1882 
1883         if (oldcurrent == slave)
1884                 bond_change_active_slave(bond, NULL);
1885 
1886         if (bond_is_lb(bond)) {
1887                 /* Must be called only after the slave has been
1888                  * detached from the list and the curr_active_slave
1889                  * has been cleared (if our_slave == old_current),
1890                  * but before a new active slave is selected.
1891                  */
1892                 bond_alb_deinit_slave(bond, slave);
1893         }
1894 
1895         if (all) {
1896                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1897         } else if (oldcurrent == slave) {
1898                 /* Note that we hold RTNL over this sequence, so there
1899                  * is no concern that another slave add/remove event
1900                  * will interfere.
1901                  */
1902                 bond_select_active_slave(bond);
1903         }
1904 
1905         if (!bond_has_slaves(bond)) {
1906                 bond_set_carrier(bond);
1907                 eth_hw_addr_random(bond_dev);
1908         }
1909 
1910         unblock_netpoll_tx();
1911         synchronize_rcu();
1912         bond->slave_cnt--;
1913 
1914         if (!bond_has_slaves(bond)) {
1915                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1916                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1917         }
1918 
1919         bond_compute_features(bond);
1920         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1921             (old_features & NETIF_F_VLAN_CHALLENGED))
1922                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1923                             slave_dev->name, bond_dev->name);
1924 
1925         vlan_vids_del_by_dev(slave_dev, bond_dev);
1926 
1927         /* If the mode uses primary, then this case was handled above by
1928          * bond_change_active_slave(..., NULL)
1929          */
1930         if (!bond_uses_primary(bond)) {
1931                 /* unset promiscuity level from slave
1932                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1933                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1934                  * value of that flag before that change, as that was the value
1935                  * when this slave was attached, so we cache at the start of the
1936                  * function and use it here. Same goes for ALLMULTI below
1937                  */
1938                 if (old_flags & IFF_PROMISC)
1939                         dev_set_promiscuity(slave_dev, -1);
1940 
1941                 /* unset allmulti level from slave */
1942                 if (old_flags & IFF_ALLMULTI)
1943                         dev_set_allmulti(slave_dev, -1);
1944 
1945                 bond_hw_addr_flush(bond_dev, slave_dev);
1946         }
1947 
1948         slave_disable_netpoll(slave);
1949 
1950         /* close slave before restoring its mac address */
1951         dev_close(slave_dev);
1952 
1953         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1954             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1955                 /* restore original ("permanent") mac address */
1956                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1957                 addr.sa_family = slave_dev->type;
1958                 dev_set_mac_address(slave_dev, &addr);
1959         }
1960 
1961         dev_set_mtu(slave_dev, slave->original_mtu);
1962 
1963         slave_dev->priv_flags &= ~IFF_BONDING;
1964 
1965         bond_free_slave(slave);
1966 
1967         return 0;
1968 }
1969 
1970 /* A wrapper used because of ndo_del_link */
1971 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1972 {
1973         return __bond_release_one(bond_dev, slave_dev, false);
1974 }
1975 
1976 /* First release a slave and then destroy the bond if no more slaves are left.
1977  * Must be under rtnl_lock when this function is called.
1978  */
1979 static int  bond_release_and_destroy(struct net_device *bond_dev,
1980                                      struct net_device *slave_dev)
1981 {
1982         struct bonding *bond = netdev_priv(bond_dev);
1983         int ret;
1984 
1985         ret = bond_release(bond_dev, slave_dev);
1986         if (ret == 0 && !bond_has_slaves(bond)) {
1987                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1988                 netdev_info(bond_dev, "Destroying bond %s\n",
1989                             bond_dev->name);
1990                 bond_remove_proc_entry(bond);
1991                 unregister_netdevice(bond_dev);
1992         }
1993         return ret;
1994 }
1995 
1996 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1997 {
1998         struct bonding *bond = netdev_priv(bond_dev);
1999         bond_fill_ifbond(bond, info);
2000         return 0;
2001 }
2002 
2003 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2004 {
2005         struct bonding *bond = netdev_priv(bond_dev);
2006         struct list_head *iter;
2007         int i = 0, res = -ENODEV;
2008         struct slave *slave;
2009 
2010         bond_for_each_slave(bond, slave, iter) {
2011                 if (i++ == (int)info->slave_id) {
2012                         res = 0;
2013                         bond_fill_ifslave(slave, info);
2014                         break;
2015                 }
2016         }
2017 
2018         return res;
2019 }
2020 
2021 /*-------------------------------- Monitoring -------------------------------*/
2022 
2023 /* called with rcu_read_lock() */
2024 static int bond_miimon_inspect(struct bonding *bond)
2025 {
2026         int link_state, commit = 0;
2027         struct list_head *iter;
2028         struct slave *slave;
2029         bool ignore_updelay;
2030 
2031         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2032 
2033         bond_for_each_slave_rcu(bond, slave, iter) {
2034                 slave->new_link = BOND_LINK_NOCHANGE;
2035 
2036                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2037 
2038                 switch (slave->link) {
2039                 case BOND_LINK_UP:
2040                         if (link_state)
2041                                 continue;
2042 
2043                         bond_set_slave_link_state(slave, BOND_LINK_FAIL,
2044                                                   BOND_SLAVE_NOTIFY_LATER);
2045                         slave->delay = bond->params.downdelay;
2046                         if (slave->delay) {
2047                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2048                                             (BOND_MODE(bond) ==
2049                                              BOND_MODE_ACTIVEBACKUP) ?
2050                                              (bond_is_active_slave(slave) ?
2051                                               "active " : "backup ") : "",
2052                                             slave->dev->name,
2053                                             bond->params.downdelay * bond->params.miimon);
2054                         }
2055                         /*FALLTHRU*/
2056                 case BOND_LINK_FAIL:
2057                         if (link_state) {
2058                                 /* recovered before downdelay expired */
2059                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2060                                                           BOND_SLAVE_NOTIFY_LATER);
2061                                 slave->last_link_up = jiffies;
2062                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2063                                             (bond->params.downdelay - slave->delay) *
2064                                             bond->params.miimon,
2065                                             slave->dev->name);
2066                                 continue;
2067                         }
2068 
2069                         if (slave->delay <= 0) {
2070                                 slave->new_link = BOND_LINK_DOWN;
2071                                 commit++;
2072                                 continue;
2073                         }
2074 
2075                         slave->delay--;
2076                         break;
2077 
2078                 case BOND_LINK_DOWN:
2079                         if (!link_state)
2080                                 continue;
2081 
2082                         bond_set_slave_link_state(slave, BOND_LINK_BACK,
2083                                                   BOND_SLAVE_NOTIFY_LATER);
2084                         slave->delay = bond->params.updelay;
2085 
2086                         if (slave->delay) {
2087                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2088                                             slave->dev->name,
2089                                             ignore_updelay ? 0 :
2090                                             bond->params.updelay *
2091                                             bond->params.miimon);
2092                         }
2093                         /*FALLTHRU*/
2094                 case BOND_LINK_BACK:
2095                         if (!link_state) {
2096                                 bond_set_slave_link_state(slave,
2097                                                           BOND_LINK_DOWN,
2098                                                           BOND_SLAVE_NOTIFY_LATER);
2099                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2100                                             (bond->params.updelay - slave->delay) *
2101                                             bond->params.miimon,
2102                                             slave->dev->name);
2103 
2104                                 continue;
2105                         }
2106 
2107                         if (ignore_updelay)
2108                                 slave->delay = 0;
2109 
2110                         if (slave->delay <= 0) {
2111                                 slave->new_link = BOND_LINK_UP;
2112                                 commit++;
2113                                 ignore_updelay = false;
2114                                 continue;
2115                         }
2116 
2117                         slave->delay--;
2118                         break;
2119                 }
2120         }
2121 
2122         return commit;
2123 }
2124 
2125 static void bond_miimon_commit(struct bonding *bond)
2126 {
2127         struct list_head *iter;
2128         struct slave *slave, *primary;
2129 
2130         bond_for_each_slave(bond, slave, iter) {
2131                 switch (slave->new_link) {
2132                 case BOND_LINK_NOCHANGE:
2133                         continue;
2134 
2135                 case BOND_LINK_UP:
2136                         bond_update_speed_duplex(slave);
2137                         bond_set_slave_link_state(slave, BOND_LINK_UP,
2138                                                   BOND_SLAVE_NOTIFY_NOW);
2139                         slave->last_link_up = jiffies;
2140 
2141                         primary = rtnl_dereference(bond->primary_slave);
2142                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2143                                 /* prevent it from being the active one */
2144                                 bond_set_backup_slave(slave);
2145                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2146                                 /* make it immediately active */
2147                                 bond_set_active_slave(slave);
2148                         } else if (slave != primary) {
2149                                 /* prevent it from being the active one */
2150                                 bond_set_backup_slave(slave);
2151                         }
2152 
2153                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2154                                     slave->dev->name,
2155                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2156                                     slave->duplex ? "full" : "half");
2157 
2158                         /* notify ad that the link status has changed */
2159                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2160                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2161 
2162                         if (bond_is_lb(bond))
2163                                 bond_alb_handle_link_change(bond, slave,
2164                                                             BOND_LINK_UP);
2165 
2166                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2167                                 bond_update_slave_arr(bond, NULL);
2168 
2169                         if (!bond->curr_active_slave || slave == primary)
2170                                 goto do_failover;
2171 
2172                         continue;
2173 
2174                 case BOND_LINK_DOWN:
2175                         if (slave->link_failure_count < UINT_MAX)
2176                                 slave->link_failure_count++;
2177 
2178                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2179                                                   BOND_SLAVE_NOTIFY_NOW);
2180 
2181                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2182                             BOND_MODE(bond) == BOND_MODE_8023AD)
2183                                 bond_set_slave_inactive_flags(slave,
2184                                                               BOND_SLAVE_NOTIFY_NOW);
2185 
2186                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2187                                     slave->dev->name);
2188 
2189                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2190                                 bond_3ad_handle_link_change(slave,
2191                                                             BOND_LINK_DOWN);
2192 
2193                         if (bond_is_lb(bond))
2194                                 bond_alb_handle_link_change(bond, slave,
2195                                                             BOND_LINK_DOWN);
2196 
2197                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2198                                 bond_update_slave_arr(bond, NULL);
2199 
2200                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2201                                 goto do_failover;
2202 
2203                         continue;
2204 
2205                 default:
2206                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2207                                    slave->new_link, slave->dev->name);
2208                         slave->new_link = BOND_LINK_NOCHANGE;
2209 
2210                         continue;
2211                 }
2212 
2213 do_failover:
2214                 block_netpoll_tx();
2215                 bond_select_active_slave(bond);
2216                 unblock_netpoll_tx();
2217         }
2218 
2219         bond_set_carrier(bond);
2220 }
2221 
2222 /* bond_mii_monitor
2223  *
2224  * Really a wrapper that splits the mii monitor into two phases: an
2225  * inspection, then (if inspection indicates something needs to be done)
2226  * an acquisition of appropriate locks followed by a commit phase to
2227  * implement whatever link state changes are indicated.
2228  */
2229 static void bond_mii_monitor(struct work_struct *work)
2230 {
2231         struct bonding *bond = container_of(work, struct bonding,
2232                                             mii_work.work);
2233         bool should_notify_peers = false;
2234         unsigned long delay;
2235 
2236         delay = msecs_to_jiffies(bond->params.miimon);
2237 
2238         if (!bond_has_slaves(bond))
2239                 goto re_arm;
2240 
2241         rcu_read_lock();
2242 
2243         should_notify_peers = bond_should_notify_peers(bond);
2244 
2245         if (bond_miimon_inspect(bond)) {
2246                 rcu_read_unlock();
2247 
2248                 /* Race avoidance with bond_close cancel of workqueue */
2249                 if (!rtnl_trylock()) {
2250                         delay = 1;
2251                         should_notify_peers = false;
2252                         goto re_arm;
2253                 }
2254 
2255                 bond_miimon_commit(bond);
2256 
2257                 rtnl_unlock();  /* might sleep, hold no other locks */
2258         } else
2259                 rcu_read_unlock();
2260 
2261 re_arm:
2262         if (bond->params.miimon)
2263                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2264 
2265         if (should_notify_peers) {
2266                 if (!rtnl_trylock())
2267                         return;
2268                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2269                 rtnl_unlock();
2270         }
2271 }
2272 
2273 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2274 {
2275         __be32 ip = *((__be32 *)data);
2276 
2277         return ip == bond_confirm_addr(upper, 0, ip);
2278 }
2279 
2280 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2281 {
2282         bool ret = false;
2283 
2284         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2285                 return true;
2286 
2287         rcu_read_lock();
2288         if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2289                 ret = true;
2290         rcu_read_unlock();
2291 
2292         return ret;
2293 }
2294 
2295 /* We go to the (large) trouble of VLAN tagging ARP frames because
2296  * switches in VLAN mode (especially if ports are configured as
2297  * "native" to a VLAN) might not pass non-tagged frames.
2298  */
2299 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2300                           __be32 dest_ip, __be32 src_ip,
2301                           struct bond_vlan_tag *tags)
2302 {
2303         struct sk_buff *skb;
2304         struct bond_vlan_tag *outer_tag = tags;
2305 
2306         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2307                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2308 
2309         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2310                          NULL, slave_dev->dev_addr, NULL);
2311 
2312         if (!skb) {
2313                 net_err_ratelimited("ARP packet allocation failed\n");
2314                 return;
2315         }
2316 
2317         if (!tags || tags->vlan_proto == VLAN_N_VID)
2318                 goto xmit;
2319 
2320         tags++;
2321 
2322         /* Go through all the tags backwards and add them to the packet */
2323         while (tags->vlan_proto != VLAN_N_VID) {
2324                 if (!tags->vlan_id) {
2325                         tags++;
2326                         continue;
2327                 }
2328 
2329                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2330                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2331                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2332                                                 tags->vlan_id);
2333                 if (!skb) {
2334                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2335                         return;
2336                 }
2337 
2338                 tags++;
2339         }
2340         /* Set the outer tag */
2341         if (outer_tag->vlan_id) {
2342                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2343                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2344                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2345                                        outer_tag->vlan_id);
2346         }
2347 
2348 xmit:
2349         arp_xmit(skb);
2350 }
2351 
2352 /* Validate the device path between the @start_dev and the @end_dev.
2353  * The path is valid if the @end_dev is reachable through device
2354  * stacking.
2355  * When the path is validated, collect any vlan information in the
2356  * path.
2357  */
2358 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2359                                               struct net_device *end_dev,
2360                                               int level)
2361 {
2362         struct bond_vlan_tag *tags;
2363         struct net_device *upper;
2364         struct list_head  *iter;
2365 
2366         if (start_dev == end_dev) {
2367                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2368                 if (!tags)
2369                         return ERR_PTR(-ENOMEM);
2370                 tags[level].vlan_proto = VLAN_N_VID;
2371                 return tags;
2372         }
2373 
2374         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2375                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2376                 if (IS_ERR_OR_NULL(tags)) {
2377                         if (IS_ERR(tags))
2378                                 return tags;
2379                         continue;
2380                 }
2381                 if (is_vlan_dev(upper)) {
2382                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2383                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2384                 }
2385 
2386                 return tags;
2387         }
2388 
2389         return NULL;
2390 }
2391 
2392 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2393 {
2394         struct rtable *rt;
2395         struct bond_vlan_tag *tags;
2396         __be32 *targets = bond->params.arp_targets, addr;
2397         int i;
2398 
2399         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2400                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2401                 tags = NULL;
2402 
2403                 /* Find out through which dev should the packet go */
2404                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2405                                      RTO_ONLINK, 0);
2406                 if (IS_ERR(rt)) {
2407                         /* there's no route to target - try to send arp
2408                          * probe to generate any traffic (arp_validate=0)
2409                          */
2410                         if (bond->params.arp_validate)
2411                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2412                                                      bond->dev->name,
2413                                                      &targets[i]);
2414                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2415                                       0, tags);
2416                         continue;
2417                 }
2418 
2419                 /* bond device itself */
2420                 if (rt->dst.dev == bond->dev)
2421                         goto found;
2422 
2423                 rcu_read_lock();
2424                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2425                 rcu_read_unlock();
2426 
2427                 if (!IS_ERR_OR_NULL(tags))
2428                         goto found;
2429 
2430                 /* Not our device - skip */
2431                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2432                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2433 
2434                 ip_rt_put(rt);
2435                 continue;
2436 
2437 found:
2438                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2439                 ip_rt_put(rt);
2440                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2441                               addr, tags);
2442                 kfree(tags);
2443         }
2444 }
2445 
2446 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2447 {
2448         int i;
2449 
2450         if (!sip || !bond_has_this_ip(bond, tip)) {
2451                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2452                            &sip, &tip);
2453                 return;
2454         }
2455 
2456         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2457         if (i == -1) {
2458                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2459                            &sip);
2460                 return;
2461         }
2462         slave->last_rx = jiffies;
2463         slave->target_last_arp_rx[i] = jiffies;
2464 }
2465 
2466 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2467                  struct slave *slave)
2468 {
2469         struct arphdr *arp = (struct arphdr *)skb->data;
2470         struct slave *curr_active_slave, *curr_arp_slave;
2471         unsigned char *arp_ptr;
2472         __be32 sip, tip;
2473         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2474 
2475         if (!slave_do_arp_validate(bond, slave)) {
2476                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2477                     !slave_do_arp_validate_only(bond))
2478                         slave->last_rx = jiffies;
2479                 return RX_HANDLER_ANOTHER;
2480         } else if (!is_arp) {
2481                 return RX_HANDLER_ANOTHER;
2482         }
2483 
2484         alen = arp_hdr_len(bond->dev);
2485 
2486         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2487                    skb->dev->name);
2488 
2489         if (alen > skb_headlen(skb)) {
2490                 arp = kmalloc(alen, GFP_ATOMIC);
2491                 if (!arp)
2492                         goto out_unlock;
2493                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2494                         goto out_unlock;
2495         }
2496 
2497         if (arp->ar_hln != bond->dev->addr_len ||
2498             skb->pkt_type == PACKET_OTHERHOST ||
2499             skb->pkt_type == PACKET_LOOPBACK ||
2500             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2501             arp->ar_pro != htons(ETH_P_IP) ||
2502             arp->ar_pln != 4)
2503                 goto out_unlock;
2504 
2505         arp_ptr = (unsigned char *)(arp + 1);
2506         arp_ptr += bond->dev->addr_len;
2507         memcpy(&sip, arp_ptr, 4);
2508         arp_ptr += 4 + bond->dev->addr_len;
2509         memcpy(&tip, arp_ptr, 4);
2510 
2511         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2512                    slave->dev->name, bond_slave_state(slave),
2513                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2514                      &sip, &tip);
2515 
2516         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2517         curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2518 
2519         /* We 'trust' the received ARP enough to validate it if:
2520          *
2521          * (a) the slave receiving the ARP is active (which includes the
2522          * current ARP slave, if any), or
2523          *
2524          * (b) the receiving slave isn't active, but there is a currently
2525          * active slave and it received valid arp reply(s) after it became
2526          * the currently active slave, or
2527          *
2528          * (c) there is an ARP slave that sent an ARP during the prior ARP
2529          * interval, and we receive an ARP reply on any slave.  We accept
2530          * these because switch FDB update delays may deliver the ARP
2531          * reply to a slave other than the sender of the ARP request.
2532          *
2533          * Note: for (b), backup slaves are receiving the broadcast ARP
2534          * request, not a reply.  This request passes from the sending
2535          * slave through the L2 switch(es) to the receiving slave.  Since
2536          * this is checking the request, sip/tip are swapped for
2537          * validation.
2538          *
2539          * This is done to avoid endless looping when we can't reach the
2540          * arp_ip_target and fool ourselves with our own arp requests.
2541          */
2542         if (bond_is_active_slave(slave))
2543                 bond_validate_arp(bond, slave, sip, tip);
2544         else if (curr_active_slave &&
2545                  time_after(slave_last_rx(bond, curr_active_slave),
2546                             curr_active_slave->last_link_up))
2547                 bond_validate_arp(bond, slave, tip, sip);
2548         else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2549                  bond_time_in_interval(bond,
2550                                        dev_trans_start(curr_arp_slave->dev), 1))
2551                 bond_validate_arp(bond, slave, sip, tip);
2552 
2553 out_unlock:
2554         if (arp != (struct arphdr *)skb->data)
2555                 kfree(arp);
2556         return RX_HANDLER_ANOTHER;
2557 }
2558 
2559 /* function to verify if we're in the arp_interval timeslice, returns true if
2560  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2561  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2562  */
2563 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2564                                   int mod)
2565 {
2566         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2567 
2568         return time_in_range(jiffies,
2569                              last_act - delta_in_ticks,
2570                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2571 }
2572 
2573 /* This function is called regularly to monitor each slave's link
2574  * ensuring that traffic is being sent and received when arp monitoring
2575  * is used in load-balancing mode. if the adapter has been dormant, then an
2576  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2577  * arp monitoring in active backup mode.
2578  */
2579 static void bond_loadbalance_arp_mon(struct work_struct *work)
2580 {
2581         struct bonding *bond = container_of(work, struct bonding,
2582                                             arp_work.work);
2583         struct slave *slave, *oldcurrent;
2584         struct list_head *iter;
2585         int do_failover = 0, slave_state_changed = 0;
2586 
2587         if (!bond_has_slaves(bond))
2588                 goto re_arm;
2589 
2590         rcu_read_lock();
2591 
2592         oldcurrent = rcu_dereference(bond->curr_active_slave);
2593         /* see if any of the previous devices are up now (i.e. they have
2594          * xmt and rcv traffic). the curr_active_slave does not come into
2595          * the picture unless it is null. also, slave->last_link_up is not
2596          * needed here because we send an arp on each slave and give a slave
2597          * as long as it needs to get the tx/rx within the delta.
2598          * TODO: what about up/down delay in arp mode? it wasn't here before
2599          *       so it can wait
2600          */
2601         bond_for_each_slave_rcu(bond, slave, iter) {
2602                 unsigned long trans_start = dev_trans_start(slave->dev);
2603 
2604                 if (slave->link != BOND_LINK_UP) {
2605                         if (bond_time_in_interval(bond, trans_start, 1) &&
2606                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2607 
2608                                 slave->link  = BOND_LINK_UP;
2609                                 slave_state_changed = 1;
2610 
2611                                 /* primary_slave has no meaning in round-robin
2612                                  * mode. the window of a slave being up and
2613                                  * curr_active_slave being null after enslaving
2614                                  * is closed.
2615                                  */
2616                                 if (!oldcurrent) {
2617                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2618                                                     slave->dev->name);
2619                                         do_failover = 1;
2620                                 } else {
2621                                         netdev_info(bond->dev, "interface %s is now up\n",
2622                                                     slave->dev->name);
2623                                 }
2624                         }
2625                 } else {
2626                         /* slave->link == BOND_LINK_UP */
2627 
2628                         /* not all switches will respond to an arp request
2629                          * when the source ip is 0, so don't take the link down
2630                          * if we don't know our ip yet
2631                          */
2632                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2633                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2634 
2635                                 slave->link  = BOND_LINK_DOWN;
2636                                 slave_state_changed = 1;
2637 
2638                                 if (slave->link_failure_count < UINT_MAX)
2639                                         slave->link_failure_count++;
2640 
2641                                 netdev_info(bond->dev, "interface %s is now down\n",
2642                                             slave->dev->name);
2643 
2644                                 if (slave == oldcurrent)
2645                                         do_failover = 1;
2646                         }
2647                 }
2648 
2649                 /* note: if switch is in round-robin mode, all links
2650                  * must tx arp to ensure all links rx an arp - otherwise
2651                  * links may oscillate or not come up at all; if switch is
2652                  * in something like xor mode, there is nothing we can
2653                  * do - all replies will be rx'ed on same link causing slaves
2654                  * to be unstable during low/no traffic periods
2655                  */
2656                 if (bond_slave_is_up(slave))
2657                         bond_arp_send_all(bond, slave);
2658         }
2659 
2660         rcu_read_unlock();
2661 
2662         if (do_failover || slave_state_changed) {
2663                 if (!rtnl_trylock())
2664                         goto re_arm;
2665 
2666                 if (slave_state_changed) {
2667                         bond_slave_state_change(bond);
2668                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2669                                 bond_update_slave_arr(bond, NULL);
2670                 }
2671                 if (do_failover) {
2672                         block_netpoll_tx();
2673                         bond_select_active_slave(bond);
2674                         unblock_netpoll_tx();
2675                 }
2676                 rtnl_unlock();
2677         }
2678 
2679 re_arm:
2680         if (bond->params.arp_interval)
2681                 queue_delayed_work(bond->wq, &bond->arp_work,
2682                                    msecs_to_jiffies(bond->params.arp_interval));
2683 }
2684 
2685 /* Called to inspect slaves for active-backup mode ARP monitor link state
2686  * changes.  Sets new_link in slaves to specify what action should take
2687  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2688  * to link states must be committed.
2689  *
2690  * Called with rcu_read_lock held.
2691  */
2692 static int bond_ab_arp_inspect(struct bonding *bond)
2693 {
2694         unsigned long trans_start, last_rx;
2695         struct list_head *iter;
2696         struct slave *slave;
2697         int commit = 0;
2698 
2699         bond_for_each_slave_rcu(bond, slave, iter) {
2700                 slave->new_link = BOND_LINK_NOCHANGE;
2701                 last_rx = slave_last_rx(bond, slave);
2702 
2703                 if (slave->link != BOND_LINK_UP) {
2704                         if (bond_time_in_interval(bond, last_rx, 1)) {
2705                                 slave->new_link = BOND_LINK_UP;
2706                                 commit++;
2707                         }
2708                         continue;
2709                 }
2710 
2711                 /* Give slaves 2*delta after being enslaved or made
2712                  * active.  This avoids bouncing, as the last receive
2713                  * times need a full ARP monitor cycle to be updated.
2714                  */
2715                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2716                         continue;
2717 
2718                 /* Backup slave is down if:
2719                  * - No current_arp_slave AND
2720                  * - more than 3*delta since last receive AND
2721                  * - the bond has an IP address
2722                  *
2723                  * Note: a non-null current_arp_slave indicates
2724                  * the curr_active_slave went down and we are
2725                  * searching for a new one; under this condition
2726                  * we only take the curr_active_slave down - this
2727                  * gives each slave a chance to tx/rx traffic
2728                  * before being taken out
2729                  */
2730                 if (!bond_is_active_slave(slave) &&
2731                     !rcu_access_pointer(bond->current_arp_slave) &&
2732                     !bond_time_in_interval(bond, last_rx, 3)) {
2733                         slave->new_link = BOND_LINK_DOWN;
2734                         commit++;
2735                 }
2736 
2737                 /* Active slave is down if:
2738                  * - more than 2*delta since transmitting OR
2739                  * - (more than 2*delta since receive AND
2740                  *    the bond has an IP address)
2741                  */
2742                 trans_start = dev_trans_start(slave->dev);
2743                 if (bond_is_active_slave(slave) &&
2744                     (!bond_time_in_interval(bond, trans_start, 2) ||
2745                      !bond_time_in_interval(bond, last_rx, 2))) {
2746                         slave->new_link = BOND_LINK_DOWN;
2747                         commit++;
2748                 }
2749         }
2750 
2751         return commit;
2752 }
2753 
2754 /* Called to commit link state changes noted by inspection step of
2755  * active-backup mode ARP monitor.
2756  *
2757  * Called with RTNL hold.
2758  */
2759 static void bond_ab_arp_commit(struct bonding *bond)
2760 {
2761         unsigned long trans_start;
2762         struct list_head *iter;
2763         struct slave *slave;
2764 
2765         bond_for_each_slave(bond, slave, iter) {
2766                 switch (slave->new_link) {
2767                 case BOND_LINK_NOCHANGE:
2768                         continue;
2769 
2770                 case BOND_LINK_UP:
2771                         trans_start = dev_trans_start(slave->dev);
2772                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2773                             (!rtnl_dereference(bond->curr_active_slave) &&
2774                              bond_time_in_interval(bond, trans_start, 1))) {
2775                                 struct slave *current_arp_slave;
2776 
2777                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2778                                 bond_set_slave_link_state(slave, BOND_LINK_UP,
2779                                                           BOND_SLAVE_NOTIFY_NOW);
2780                                 if (current_arp_slave) {
2781                                         bond_set_slave_inactive_flags(
2782                                                 current_arp_slave,
2783                                                 BOND_SLAVE_NOTIFY_NOW);
2784                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2785                                 }
2786 
2787                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2788                                             slave->dev->name);
2789 
2790                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2791                                     slave == rtnl_dereference(bond->primary_slave))
2792                                         goto do_failover;
2793 
2794                         }
2795 
2796                         continue;
2797 
2798                 case BOND_LINK_DOWN:
2799                         if (slave->link_failure_count < UINT_MAX)
2800                                 slave->link_failure_count++;
2801 
2802                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2803                                                   BOND_SLAVE_NOTIFY_NOW);
2804                         bond_set_slave_inactive_flags(slave,
2805                                                       BOND_SLAVE_NOTIFY_NOW);
2806 
2807                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2808                                     slave->dev->name);
2809 
2810                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2811                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2812                                 goto do_failover;
2813                         }
2814 
2815                         continue;
2816 
2817                 default:
2818                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2819                                    slave->new_link, slave->dev->name);
2820                         continue;
2821                 }
2822 
2823 do_failover:
2824                 block_netpoll_tx();
2825                 bond_select_active_slave(bond);
2826                 unblock_netpoll_tx();
2827         }
2828 
2829         bond_set_carrier(bond);
2830 }
2831 
2832 /* Send ARP probes for active-backup mode ARP monitor.
2833  *
2834  * Called with rcu_read_lock held.
2835  */
2836 static bool bond_ab_arp_probe(struct bonding *bond)
2837 {
2838         struct slave *slave, *before = NULL, *new_slave = NULL,
2839                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2840                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2841         struct list_head *iter;
2842         bool found = false;
2843         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2844 
2845         if (curr_arp_slave && curr_active_slave)
2846                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2847                             curr_arp_slave->dev->name,
2848                             curr_active_slave->dev->name);
2849 
2850         if (curr_active_slave) {
2851                 bond_arp_send_all(bond, curr_active_slave);
2852                 return should_notify_rtnl;
2853         }
2854 
2855         /* if we don't have a curr_active_slave, search for the next available
2856          * backup slave from the current_arp_slave and make it the candidate
2857          * for becoming the curr_active_slave
2858          */
2859 
2860         if (!curr_arp_slave) {
2861                 curr_arp_slave = bond_first_slave_rcu(bond);
2862                 if (!curr_arp_slave)
2863                         return should_notify_rtnl;
2864         }
2865 
2866         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2867 
2868         bond_for_each_slave_rcu(bond, slave, iter) {
2869                 if (!found && !before && bond_slave_is_up(slave))
2870                         before = slave;
2871 
2872                 if (found && !new_slave && bond_slave_is_up(slave))
2873                         new_slave = slave;
2874                 /* if the link state is up at this point, we
2875                  * mark it down - this can happen if we have
2876                  * simultaneous link failures and
2877                  * reselect_active_interface doesn't make this
2878                  * one the current slave so it is still marked
2879                  * up when it is actually down
2880                  */
2881                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2882                         bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2883                                                   BOND_SLAVE_NOTIFY_LATER);
2884                         if (slave->link_failure_count < UINT_MAX)
2885                                 slave->link_failure_count++;
2886 
2887                         bond_set_slave_inactive_flags(slave,
2888                                                       BOND_SLAVE_NOTIFY_LATER);
2889 
2890                         netdev_info(bond->dev, "backup interface %s is now down\n",
2891                                     slave->dev->name);
2892                 }
2893                 if (slave == curr_arp_slave)
2894                         found = true;
2895         }
2896 
2897         if (!new_slave && before)
2898                 new_slave = before;
2899 
2900         if (!new_slave)
2901                 goto check_state;
2902 
2903         bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2904                                   BOND_SLAVE_NOTIFY_LATER);
2905         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2906         bond_arp_send_all(bond, new_slave);
2907         new_slave->last_link_up = jiffies;
2908         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2909 
2910 check_state:
2911         bond_for_each_slave_rcu(bond, slave, iter) {
2912                 if (slave->should_notify || slave->should_notify_link) {
2913                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2914                         break;
2915                 }
2916         }
2917         return should_notify_rtnl;
2918 }
2919 
2920 static void bond_activebackup_arp_mon(struct work_struct *work)
2921 {
2922         struct bonding *bond = container_of(work, struct bonding,
2923                                             arp_work.work);
2924         bool should_notify_peers = false;
2925         bool should_notify_rtnl = false;
2926         int delta_in_ticks;
2927 
2928         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2929 
2930         if (!bond_has_slaves(bond))
2931                 goto re_arm;
2932 
2933         rcu_read_lock();
2934 
2935         should_notify_peers = bond_should_notify_peers(bond);
2936 
2937         if (bond_ab_arp_inspect(bond)) {
2938                 rcu_read_unlock();
2939 
2940                 /* Race avoidance with bond_close flush of workqueue */
2941                 if (!rtnl_trylock()) {
2942                         delta_in_ticks = 1;
2943                         should_notify_peers = false;
2944                         goto re_arm;
2945                 }
2946 
2947                 bond_ab_arp_commit(bond);
2948 
2949                 rtnl_unlock();
2950                 rcu_read_lock();
2951         }
2952 
2953         should_notify_rtnl = bond_ab_arp_probe(bond);
2954         rcu_read_unlock();
2955 
2956 re_arm:
2957         if (bond->params.arp_interval)
2958                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2959 
2960         if (should_notify_peers || should_notify_rtnl) {
2961                 if (!rtnl_trylock())
2962                         return;
2963 
2964                 if (should_notify_peers)
2965                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2966                                                  bond->dev);
2967                 if (should_notify_rtnl) {
2968                         bond_slave_state_notify(bond);
2969                         bond_slave_link_notify(bond);
2970                 }
2971 
2972                 rtnl_unlock();
2973         }
2974 }
2975 
2976 /*-------------------------- netdev event handling --------------------------*/
2977 
2978 /* Change device name */
2979 static int bond_event_changename(struct bonding *bond)
2980 {
2981         bond_remove_proc_entry(bond);
2982         bond_create_proc_entry(bond);
2983 
2984         bond_debug_reregister(bond);
2985 
2986         return NOTIFY_DONE;
2987 }
2988 
2989 static int bond_master_netdev_event(unsigned long event,
2990                                     struct net_device *bond_dev)
2991 {
2992         struct bonding *event_bond = netdev_priv(bond_dev);
2993 
2994         switch (event) {
2995         case NETDEV_CHANGENAME:
2996                 return bond_event_changename(event_bond);
2997         case NETDEV_UNREGISTER:
2998                 bond_remove_proc_entry(event_bond);
2999                 break;
3000         case NETDEV_REGISTER:
3001                 bond_create_proc_entry(event_bond);
3002                 break;
3003         case NETDEV_NOTIFY_PEERS:
3004                 if (event_bond->send_peer_notif)
3005                         event_bond->send_peer_notif--;
3006                 break;
3007         default:
3008                 break;
3009         }
3010 
3011         return NOTIFY_DONE;
3012 }
3013 
3014 static int bond_slave_netdev_event(unsigned long event,
3015                                    struct net_device *slave_dev)
3016 {
3017         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3018         struct bonding *bond;
3019         struct net_device *bond_dev;
3020 
3021         /* A netdev event can be generated while enslaving a device
3022          * before netdev_rx_handler_register is called in which case
3023          * slave will be NULL
3024          */
3025         if (!slave)
3026                 return NOTIFY_DONE;
3027         bond_dev = slave->bond->dev;
3028         bond = slave->bond;
3029         primary = rtnl_dereference(bond->primary_slave);
3030 
3031         switch (event) {
3032         case NETDEV_UNREGISTER:
3033                 if (bond_dev->type != ARPHRD_ETHER)
3034                         bond_release_and_destroy(bond_dev, slave_dev);
3035                 else
3036                         bond_release(bond_dev, slave_dev);
3037                 break;
3038         case NETDEV_UP:
3039         case NETDEV_CHANGE:
3040                 bond_update_speed_duplex(slave);
3041                 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3042                         bond_3ad_adapter_speed_duplex_changed(slave);
3043                 /* Fallthrough */
3044         case NETDEV_DOWN:
3045                 /* Refresh slave-array if applicable!
3046                  * If the setup does not use miimon or arpmon (mode-specific!),
3047                  * then these events will not cause the slave-array to be
3048                  * refreshed. This will cause xmit to use a slave that is not
3049                  * usable. Avoid such situation by refeshing the array at these
3050                  * events. If these (miimon/arpmon) parameters are configured
3051                  * then array gets refreshed twice and that should be fine!
3052                  */
3053                 if (bond_mode_uses_xmit_hash(bond))
3054                         bond_update_slave_arr(bond, NULL);
3055                 break;
3056         case NETDEV_CHANGEMTU:
3057                 /* TODO: Should slaves be allowed to
3058                  * independently alter their MTU?  For
3059                  * an active-backup bond, slaves need
3060                  * not be the same type of device, so
3061                  * MTUs may vary.  For other modes,
3062                  * slaves arguably should have the
3063                  * same MTUs. To do this, we'd need to
3064                  * take over the slave's change_mtu
3065                  * function for the duration of their
3066                  * servitude.
3067                  */
3068                 break;
3069         case NETDEV_CHANGENAME:
3070                 /* we don't care if we don't have primary set */
3071                 if (!bond_uses_primary(bond) ||
3072                     !bond->params.primary[0])
3073                         break;
3074 
3075                 if (slave == primary) {
3076                         /* slave's name changed - he's no longer primary */
3077                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3078                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3079                         /* we have a new primary slave */
3080                         rcu_assign_pointer(bond->primary_slave, slave);
3081                 } else { /* we didn't change primary - exit */
3082                         break;
3083                 }
3084 
3085                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3086                             primary ? slave_dev->name : "none");
3087 
3088                 block_netpoll_tx();
3089                 bond_select_active_slave(bond);
3090                 unblock_netpoll_tx();
3091                 break;
3092         case NETDEV_FEAT_CHANGE:
3093                 bond_compute_features(bond);
3094                 break;
3095         case NETDEV_RESEND_IGMP:
3096                 /* Propagate to master device */
3097                 call_netdevice_notifiers(event, slave->bond->dev);
3098                 break;
3099         default:
3100                 break;
3101         }
3102 
3103         return NOTIFY_DONE;
3104 }
3105 
3106 /* bond_netdev_event: handle netdev notifier chain events.
3107  *
3108  * This function receives events for the netdev chain.  The caller (an
3109  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3110  * locks for us to safely manipulate the slave devices (RTNL lock,
3111  * dev_probe_lock).
3112  */
3113 static int bond_netdev_event(struct notifier_block *this,
3114                              unsigned long event, void *ptr)
3115 {
3116         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3117 
3118         netdev_dbg(event_dev, "event: %lx\n", event);
3119 
3120         if (!(event_dev->priv_flags & IFF_BONDING))
3121                 return NOTIFY_DONE;
3122 
3123         if (event_dev->flags & IFF_MASTER) {
3124                 netdev_dbg(event_dev, "IFF_MASTER\n");
3125                 return bond_master_netdev_event(event, event_dev);
3126         }
3127 
3128         if (event_dev->flags & IFF_SLAVE) {
3129                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3130                 return bond_slave_netdev_event(event, event_dev);
3131         }
3132 
3133         return NOTIFY_DONE;
3134 }
3135 
3136 static struct notifier_block bond_netdev_notifier = {
3137         .notifier_call = bond_netdev_event,
3138 };
3139 
3140 /*---------------------------- Hashing Policies -----------------------------*/
3141 
3142 /* L2 hash helper */
3143 static inline u32 bond_eth_hash(struct sk_buff *skb)
3144 {
3145         struct ethhdr *ep, hdr_tmp;
3146 
3147         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3148         if (ep)
3149                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3150         return 0;
3151 }
3152 
3153 /* Extract the appropriate headers based on bond's xmit policy */
3154 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3155                               struct flow_keys *fk)
3156 {
3157         const struct ipv6hdr *iph6;
3158         const struct iphdr *iph;
3159         int noff, proto = -1;
3160 
3161         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3162                 return skb_flow_dissect_flow_keys(skb, fk, 0);
3163 
3164         fk->ports.ports = 0;
3165         noff = skb_network_offset(skb);
3166         if (skb->protocol == htons(ETH_P_IP)) {
3167                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3168                         return false;
3169                 iph = ip_hdr(skb);
3170                 iph_to_flow_copy_v4addrs(fk, iph);
3171                 noff += iph->ihl << 2;
3172                 if (!ip_is_fragment(iph))
3173                         proto = iph->protocol;
3174         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3175                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3176                         return false;
3177                 iph6 = ipv6_hdr(skb);
3178                 iph_to_flow_copy_v6addrs(fk, iph6);
3179                 noff += sizeof(*iph6);
3180                 proto = iph6->nexthdr;
3181         } else {
3182                 return false;
3183         }
3184         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3185                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3186 
3187         return true;
3188 }
3189 
3190 /**
3191  * bond_xmit_hash - generate a hash value based on the xmit policy
3192  * @bond: bonding device
3193  * @skb: buffer to use for headers
3194  *
3195  * This function will extract the necessary headers from the skb buffer and use
3196  * them to generate a hash based on the xmit_policy set in the bonding device
3197  */
3198 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3199 {
3200         struct flow_keys flow;
3201         u32 hash;
3202 
3203         if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3204             skb->l4_hash)
3205                 return skb->hash;
3206 
3207         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3208             !bond_flow_dissect(bond, skb, &flow))
3209                 return bond_eth_hash(skb);
3210 
3211         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3212             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3213                 hash = bond_eth_hash(skb);
3214         else
3215                 hash = (__force u32)flow.ports.ports;
3216         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3217                 (__force u32)flow_get_u32_src(&flow);
3218         hash ^= (hash >> 16);
3219         hash ^= (hash >> 8);
3220 
3221         return hash;
3222 }
3223 
3224 /*-------------------------- Device entry points ----------------------------*/
3225 
3226 static void bond_work_init_all(struct bonding *bond)
3227 {
3228         INIT_DELAYED_WORK(&bond->mcast_work,
3229                           bond_resend_igmp_join_requests_delayed);
3230         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3231         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3232         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3233                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3234         else
3235                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3236         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3237         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3238 }
3239 
3240 static void bond_work_cancel_all(struct bonding *bond)
3241 {
3242         cancel_delayed_work_sync(&bond->mii_work);
3243         cancel_delayed_work_sync(&bond->arp_work);
3244         cancel_delayed_work_sync(&bond->alb_work);
3245         cancel_delayed_work_sync(&bond->ad_work);
3246         cancel_delayed_work_sync(&bond->mcast_work);
3247         cancel_delayed_work_sync(&bond->slave_arr_work);
3248 }
3249 
3250 static int bond_open(struct net_device *bond_dev)
3251 {
3252         struct bonding *bond = netdev_priv(bond_dev);
3253         struct list_head *iter;
3254         struct slave *slave;
3255 
3256         /* reset slave->backup and slave->inactive */
3257         if (bond_has_slaves(bond)) {
3258                 bond_for_each_slave(bond, slave, iter) {
3259                         if (bond_uses_primary(bond) &&
3260                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3261                                 bond_set_slave_inactive_flags(slave,
3262                                                               BOND_SLAVE_NOTIFY_NOW);
3263                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3264                                 bond_set_slave_active_flags(slave,
3265                                                             BOND_SLAVE_NOTIFY_NOW);
3266                         }
3267                 }
3268         }
3269 
3270         bond_work_init_all(bond);
3271 
3272         if (bond_is_lb(bond)) {
3273                 /* bond_alb_initialize must be called before the timer
3274                  * is started.
3275                  */
3276                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3277                         return -ENOMEM;
3278                 if (bond->params.tlb_dynamic_lb)
3279                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3280         }
3281 
3282         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3283                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3284 
3285         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3286                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3287                 bond->recv_probe = bond_arp_rcv;
3288         }
3289 
3290         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3291                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3292                 /* register to receive LACPDUs */
3293                 bond->recv_probe = bond_3ad_lacpdu_recv;
3294                 bond_3ad_initiate_agg_selection(bond, 1);
3295         }
3296 
3297         if (bond_mode_uses_xmit_hash(bond))
3298                 bond_update_slave_arr(bond, NULL);
3299 
3300         return 0;
3301 }
3302 
3303 static int bond_close(struct net_device *bond_dev)
3304 {
3305         struct bonding *bond = netdev_priv(bond_dev);
3306 
3307         bond_work_cancel_all(bond);
3308         bond->send_peer_notif = 0;
3309         if (bond_is_lb(bond))
3310                 bond_alb_deinitialize(bond);
3311         bond->recv_probe = NULL;
3312 
3313         return 0;
3314 }
3315 
3316 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3317  * that some drivers can provide 32bit values only.
3318  */
3319 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3320                             const struct rtnl_link_stats64 *_new,
3321                             const struct rtnl_link_stats64 *_old)
3322 {
3323         const u64 *new = (const u64 *)_new;
3324         const u64 *old = (const u64 *)_old;
3325         u64 *res = (u64 *)_res;
3326         int i;
3327 
3328         for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3329                 u64 nv = new[i];
3330                 u64 ov = old[i];
3331 
3332                 /* detects if this particular field is 32bit only */
3333                 if (((nv | ov) >> 32) == 0)
3334                         res[i] += (u32)nv - (u32)ov;
3335                 else
3336                         res[i] += nv - ov;
3337         }
3338 }
3339 
3340 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3341                                                 struct rtnl_link_stats64 *stats)
3342 {
3343         struct bonding *bond = netdev_priv(bond_dev);
3344         struct rtnl_link_stats64 temp;
3345         struct list_head *iter;
3346         struct slave *slave;
3347 
3348         spin_lock(&bond->stats_lock);
3349         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3350 
3351         rcu_read_lock();
3352         bond_for_each_slave_rcu(bond, slave, iter) {
3353                 const struct rtnl_link_stats64 *new =
3354                         dev_get_stats(slave->dev, &temp);
3355 
3356                 bond_fold_stats(stats, new, &slave->slave_stats);
3357 
3358                 /* save off the slave stats for the next run */
3359                 memcpy(&slave->slave_stats, new, sizeof(*new));
3360         }
3361         rcu_read_unlock();
3362 
3363         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3364         spin_unlock(&bond->stats_lock);
3365 
3366         return stats;
3367 }
3368 
3369 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3370 {
3371         struct bonding *bond = netdev_priv(bond_dev);
3372         struct net_device *slave_dev = NULL;
3373         struct ifbond k_binfo;
3374         struct ifbond __user *u_binfo = NULL;
3375         struct ifslave k_sinfo;
3376         struct ifslave __user *u_sinfo = NULL;
3377         struct mii_ioctl_data *mii = NULL;
3378         struct bond_opt_value newval;
3379         struct net *net;
3380         int res = 0;
3381 
3382         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3383 
3384         switch (cmd) {
3385         case SIOCGMIIPHY:
3386                 mii = if_mii(ifr);
3387                 if (!mii)
3388                         return -EINVAL;
3389 
3390                 mii->phy_id = 0;
3391                 /* Fall Through */
3392         case SIOCGMIIREG:
3393                 /* We do this again just in case we were called by SIOCGMIIREG
3394                  * instead of SIOCGMIIPHY.
3395                  */
3396                 mii = if_mii(ifr);
3397                 if (!mii)
3398                         return -EINVAL;
3399 
3400                 if (mii->reg_num == 1) {
3401                         mii->val_out = 0;
3402                         if (netif_carrier_ok(bond->dev))
3403                                 mii->val_out = BMSR_LSTATUS;
3404                 }
3405 
3406                 return 0;
3407         case BOND_INFO_QUERY_OLD:
3408         case SIOCBONDINFOQUERY:
3409                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3410 
3411                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3412                         return -EFAULT;
3413 
3414                 res = bond_info_query(bond_dev, &k_binfo);
3415                 if (res == 0 &&
3416                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3417                         return -EFAULT;
3418 
3419                 return res;
3420         case BOND_SLAVE_INFO_QUERY_OLD:
3421         case SIOCBONDSLAVEINFOQUERY:
3422                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3423 
3424                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3425                         return -EFAULT;
3426 
3427                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3428                 if (res == 0 &&
3429                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3430                         return -EFAULT;
3431 
3432                 return res;
3433         default:
3434                 break;
3435         }
3436 
3437         net = dev_net(bond_dev);
3438 
3439         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3440                 return -EPERM;
3441 
3442         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3443 
3444         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3445 
3446         if (!slave_dev)
3447                 return -ENODEV;
3448 
3449         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3450         switch (cmd) {
3451         case BOND_ENSLAVE_OLD:
3452         case SIOCBONDENSLAVE:
3453                 res = bond_enslave(bond_dev, slave_dev);
3454                 break;
3455         case BOND_RELEASE_OLD:
3456         case SIOCBONDRELEASE:
3457                 res = bond_release(bond_dev, slave_dev);
3458                 break;
3459         case BOND_SETHWADDR_OLD:
3460         case SIOCBONDSETHWADDR:
3461                 bond_set_dev_addr(bond_dev, slave_dev);
3462                 res = 0;
3463                 break;
3464         case BOND_CHANGE_ACTIVE_OLD:
3465         case SIOCBONDCHANGEACTIVE:
3466                 bond_opt_initstr(&newval, slave_dev->name);
3467                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3468                 break;
3469         default:
3470                 res = -EOPNOTSUPP;
3471         }
3472 
3473         return res;
3474 }
3475 
3476 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3477 {
3478         struct bonding *bond = netdev_priv(bond_dev);
3479 
3480         if (change & IFF_PROMISC)
3481                 bond_set_promiscuity(bond,
3482                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3483 
3484         if (change & IFF_ALLMULTI)
3485                 bond_set_allmulti(bond,
3486                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3487 }
3488 
3489 static void bond_set_rx_mode(struct net_device *bond_dev)
3490 {
3491         struct bonding *bond = netdev_priv(bond_dev);
3492         struct list_head *iter;
3493         struct slave *slave;
3494 
3495         rcu_read_lock();
3496         if (bond_uses_primary(bond)) {
3497                 slave = rcu_dereference(bond->curr_active_slave);
3498                 if (slave) {
3499                         dev_uc_sync(slave->dev, bond_dev);
3500                         dev_mc_sync(slave->dev, bond_dev);
3501                 }
3502         } else {
3503                 bond_for_each_slave_rcu(bond, slave, iter) {
3504                         dev_uc_sync_multiple(slave->dev, bond_dev);
3505                         dev_mc_sync_multiple(slave->dev, bond_dev);
3506                 }
3507         }
3508         rcu_read_unlock();
3509 }
3510 
3511 static int bond_neigh_init(struct neighbour *n)
3512 {
3513         struct bonding *bond = netdev_priv(n->dev);
3514         const struct net_device_ops *slave_ops;
3515         struct neigh_parms parms;
3516         struct slave *slave;
3517         int ret;
3518 
3519         slave = bond_first_slave(bond);
3520         if (!slave)
3521                 return 0;
3522         slave_ops = slave->dev->netdev_ops;
3523         if (!slave_ops->ndo_neigh_setup)
3524                 return 0;
3525 
3526         parms.neigh_setup = NULL;
3527         parms.neigh_cleanup = NULL;
3528         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3529         if (ret)
3530                 return ret;
3531 
3532         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3533          * after the last slave has been detached.  Assumes that all slaves
3534          * utilize the same neigh_cleanup (true at this writing as only user
3535          * is ipoib).
3536          */
3537         n->parms->neigh_cleanup = parms.neigh_cleanup;
3538 
3539         if (!parms.neigh_setup)
3540                 return 0;
3541 
3542         return parms.neigh_setup(n);
3543 }
3544 
3545 /* The bonding ndo_neigh_setup is called at init time beofre any
3546  * slave exists. So we must declare proxy setup function which will
3547  * be used at run time to resolve the actual slave neigh param setup.
3548  *
3549  * It's also called by master devices (such as vlans) to setup their
3550  * underlying devices. In that case - do nothing, we're already set up from
3551  * our init.
3552  */
3553 static int bond_neigh_setup(struct net_device *dev,
3554                             struct neigh_parms *parms)
3555 {
3556         /* modify only our neigh_parms */
3557         if (parms->dev == dev)
3558                 parms->neigh_setup = bond_neigh_init;
3559 
3560         return 0;
3561 }
3562 
3563 /* Change the MTU of all of a master's slaves to match the master */
3564 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3565 {
3566         struct bonding *bond = netdev_priv(bond_dev);
3567         struct slave *slave, *rollback_slave;
3568         struct list_head *iter;
3569         int res = 0;
3570 
3571         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3572 
3573         bond_for_each_slave(bond, slave, iter) {
3574                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3575                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3576 
3577                 res = dev_set_mtu(slave->dev, new_mtu);
3578 
3579                 if (res) {
3580                         /* If we failed to set the slave's mtu to the new value
3581                          * we must abort the operation even in ACTIVE_BACKUP
3582                          * mode, because if we allow the backup slaves to have
3583                          * different mtu values than the active slave we'll
3584                          * need to change their mtu when doing a failover. That
3585                          * means changing their mtu from timer context, which
3586                          * is probably not a good idea.
3587                          */
3588                         netdev_dbg(bond_dev, "err %d %s\n", res,
3589                                    slave->dev->name);
3590                         goto unwind;
3591                 }
3592         }
3593 
3594         bond_dev->mtu = new_mtu;
3595 
3596         return 0;
3597 
3598 unwind:
3599         /* unwind from head to the slave that failed */
3600         bond_for_each_slave(bond, rollback_slave, iter) {
3601                 int tmp_res;
3602 
3603                 if (rollback_slave == slave)
3604                         break;
3605 
3606                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3607                 if (tmp_res) {
3608                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3609                                    tmp_res, rollback_slave->dev->name);
3610                 }
3611         }
3612 
3613         return res;
3614 }
3615 
3616 /* Change HW address
3617  *
3618  * Note that many devices must be down to change the HW address, and
3619  * downing the master releases all slaves.  We can make bonds full of
3620  * bonding devices to test this, however.
3621  */
3622 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3623 {
3624         struct bonding *bond = netdev_priv(bond_dev);
3625         struct slave *slave, *rollback_slave;
3626         struct sockaddr *sa = addr, tmp_sa;
3627         struct list_head *iter;
3628         int res = 0;
3629 
3630         if (BOND_MODE(bond) == BOND_MODE_ALB)
3631                 return bond_alb_set_mac_address(bond_dev, addr);
3632 
3633 
3634         netdev_dbg(bond_dev, "bond=%p\n", bond);
3635 
3636         /* If fail_over_mac is enabled, do nothing and return success.
3637          * Returning an error causes ifenslave to fail.
3638          */
3639         if (bond->params.fail_over_mac &&
3640             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3641                 return 0;
3642 
3643         if (!is_valid_ether_addr(sa->sa_data))
3644                 return -EADDRNOTAVAIL;
3645 
3646         bond_for_each_slave(bond, slave, iter) {
3647                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3648                 res = dev_set_mac_address(slave->dev, addr);
3649                 if (res) {
3650                         /* TODO: consider downing the slave
3651                          * and retry ?
3652                          * User should expect communications
3653                          * breakage anyway until ARP finish
3654                          * updating, so...
3655                          */
3656                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3657                         goto unwind;
3658                 }
3659         }
3660 
3661         /* success */
3662         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3663         return 0;
3664 
3665 unwind:
3666         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3667         tmp_sa.sa_family = bond_dev->type;
3668 
3669         /* unwind from head to the slave that failed */
3670         bond_for_each_slave(bond, rollback_slave, iter) {
3671                 int tmp_res;
3672 
3673                 if (rollback_slave == slave)
3674                         break;
3675 
3676                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3677                 if (tmp_res) {
3678                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3679                                    tmp_res, rollback_slave->dev->name);
3680                 }
3681         }
3682 
3683         return res;
3684 }
3685 
3686 /**
3687  * bond_xmit_slave_id - transmit skb through slave with slave_id
3688  * @bond: bonding device that is transmitting
3689  * @skb: buffer to transmit
3690  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3691  *
3692  * This function tries to transmit through slave with slave_id but in case
3693  * it fails, it tries to find the first available slave for transmission.
3694  * The skb is consumed in all cases, thus the function is void.
3695  */
3696 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3697 {
3698         struct list_head *iter;
3699         struct slave *slave;
3700         int i = slave_id;
3701 
3702         /* Here we start from the slave with slave_id */
3703         bond_for_each_slave_rcu(bond, slave, iter) {
3704                 if (--i < 0) {
3705                         if (bond_slave_can_tx(slave)) {
3706                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3707                                 return;
3708                         }
3709                 }
3710         }
3711 
3712         /* Here we start from the first slave up to slave_id */
3713         i = slave_id;
3714         bond_for_each_slave_rcu(bond, slave, iter) {
3715                 if (--i < 0)
3716                         break;
3717                 if (bond_slave_can_tx(slave)) {
3718                         bond_dev_queue_xmit(bond, skb, slave->dev);
3719                         return;
3720                 }
3721         }
3722         /* no slave that can tx has been found */
3723         bond_tx_drop(bond->dev, skb);
3724 }
3725 
3726 /**
3727  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3728  * @bond: bonding device to use
3729  *
3730  * Based on the value of the bonding device's packets_per_slave parameter
3731  * this function generates a slave id, which is usually used as the next
3732  * slave to transmit through.
3733  */
3734 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3735 {
3736         u32 slave_id;
3737         struct reciprocal_value reciprocal_packets_per_slave;
3738         int packets_per_slave = bond->params.packets_per_slave;
3739 
3740         switch (packets_per_slave) {
3741         case 0:
3742                 slave_id = prandom_u32();
3743                 break;
3744         case 1:
3745                 slave_id = bond->rr_tx_counter;
3746                 break;
3747         default:
3748                 reciprocal_packets_per_slave =
3749                         bond->params.reciprocal_packets_per_slave;
3750                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3751                                              reciprocal_packets_per_slave);
3752                 break;
3753         }
3754         bond->rr_tx_counter++;
3755 
3756         return slave_id;
3757 }
3758 
3759 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3760 {
3761         struct bonding *bond = netdev_priv(bond_dev);
3762         struct iphdr *iph = ip_hdr(skb);
3763         struct slave *slave;
3764         u32 slave_id;
3765 
3766         /* Start with the curr_active_slave that joined the bond as the
3767          * default for sending IGMP traffic.  For failover purposes one
3768          * needs to maintain some consistency for the interface that will
3769          * send the join/membership reports.  The curr_active_slave found
3770          * will send all of this type of traffic.
3771          */
3772         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3773                 slave = rcu_dereference(bond->curr_active_slave);
3774                 if (slave)
3775                         bond_dev_queue_xmit(bond, skb, slave->dev);
3776                 else
3777                         bond_xmit_slave_id(bond, skb, 0);
3778         } else {
3779                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3780 
3781                 if (likely(slave_cnt)) {
3782                         slave_id = bond_rr_gen_slave_id(bond);
3783                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3784                 } else {
3785                         bond_tx_drop(bond_dev, skb);
3786                 }
3787         }
3788 
3789         return NETDEV_TX_OK;
3790 }
3791 
3792 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3793  * the bond has a usable interface.
3794  */
3795 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3796 {
3797         struct bonding *bond = netdev_priv(bond_dev);
3798         struct slave *slave;
3799 
3800         slave = rcu_dereference(bond->curr_active_slave);
3801         if (slave)
3802                 bond_dev_queue_xmit(bond, skb, slave->dev);
3803         else
3804                 bond_tx_drop(bond_dev, skb);
3805 
3806         return NETDEV_TX_OK;
3807 }
3808 
3809 /* Use this to update slave_array when (a) it's not appropriate to update
3810  * slave_array right away (note that update_slave_array() may sleep)
3811  * and / or (b) RTNL is not held.
3812  */
3813 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3814 {
3815         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3816 }
3817 
3818 /* Slave array work handler. Holds only RTNL */
3819 static void bond_slave_arr_handler(struct work_struct *work)
3820 {
3821         struct bonding *bond = container_of(work, struct bonding,
3822                                             slave_arr_work.work);
3823         int ret;
3824 
3825         if (!rtnl_trylock())
3826                 goto err;
3827 
3828         ret = bond_update_slave_arr(bond, NULL);
3829         rtnl_unlock();
3830         if (ret) {
3831                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3832                 goto err;
3833         }
3834         return;
3835 
3836 err:
3837         bond_slave_arr_work_rearm(bond, 1);
3838 }
3839 
3840 /* Build the usable slaves array in control path for modes that use xmit-hash
3841  * to determine the slave interface -
3842  * (a) BOND_MODE_8023AD
3843  * (b) BOND_MODE_XOR
3844  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3845  *
3846  * The caller is expected to hold RTNL only and NO other lock!
3847  */
3848 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3849 {
3850         struct slave *slave;
3851         struct list_head *iter;
3852         struct bond_up_slave *new_arr, *old_arr;
3853         int agg_id = 0;
3854         int ret = 0;
3855 
3856 #ifdef CONFIG_LOCKDEP
3857         WARN_ON(lockdep_is_held(&bond->mode_lock));
3858 #endif
3859 
3860         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3861                           GFP_KERNEL);
3862         if (!new_arr) {
3863                 ret = -ENOMEM;
3864                 pr_err("Failed to build slave-array.\n");
3865                 goto out;
3866         }
3867         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3868                 struct ad_info ad_info;
3869 
3870                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3871                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3872                         kfree_rcu(new_arr, rcu);
3873                         /* No active aggragator means it's not safe to use
3874                          * the previous array.
3875                          */
3876                         old_arr = rtnl_dereference(bond->slave_arr);
3877                         if (old_arr) {
3878                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3879                                 kfree_rcu(old_arr, rcu);
3880                         }
3881                         goto out;
3882                 }
3883                 agg_id = ad_info.aggregator_id;
3884         }
3885         bond_for_each_slave(bond, slave, iter) {
3886                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3887                         struct aggregator *agg;
3888 
3889                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3890                         if (!agg || agg->aggregator_identifier != agg_id)
3891                                 continue;
3892                 }
3893                 if (!bond_slave_can_tx(slave))
3894                         continue;
3895                 if (skipslave == slave)
3896                         continue;
3897                 new_arr->arr[new_arr->count++] = slave;
3898         }
3899 
3900         old_arr = rtnl_dereference(bond->slave_arr);
3901         rcu_assign_pointer(bond->slave_arr, new_arr);
3902         if (old_arr)
3903                 kfree_rcu(old_arr, rcu);
3904 out:
3905         if (ret != 0 && skipslave) {
3906                 int idx;
3907 
3908                 /* Rare situation where caller has asked to skip a specific
3909                  * slave but allocation failed (most likely!). BTW this is
3910                  * only possible when the call is initiated from
3911                  * __bond_release_one(). In this situation; overwrite the
3912                  * skipslave entry in the array with the last entry from the
3913                  * array to avoid a situation where the xmit path may choose
3914                  * this to-be-skipped slave to send a packet out.
3915                  */
3916                 old_arr = rtnl_dereference(bond->slave_arr);
3917                 for (idx = 0; idx < old_arr->count; idx++) {
3918                         if (skipslave == old_arr->arr[idx]) {
3919                                 old_arr->arr[idx] =
3920                                     old_arr->arr[old_arr->count-1];
3921                                 old_arr->count--;
3922                                 break;
3923                         }
3924                 }
3925         }
3926         return ret;
3927 }
3928 
3929 /* Use this Xmit function for 3AD as well as XOR modes. The current
3930  * usable slave array is formed in the control path. The xmit function
3931  * just calculates hash and sends the packet out.
3932  */
3933 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3934 {
3935         struct bonding *bond = netdev_priv(dev);
3936         struct slave *slave;
3937         struct bond_up_slave *slaves;
3938         unsigned int count;
3939 
3940         slaves = rcu_dereference(bond->slave_arr);
3941         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3942         if (likely(count)) {
3943                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3944                 bond_dev_queue_xmit(bond, skb, slave->dev);
3945         } else {
3946                 bond_tx_drop(dev, skb);
3947         }
3948 
3949         return NETDEV_TX_OK;
3950 }
3951 
3952 /* in broadcast mode, we send everything to all usable interfaces. */
3953 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3954 {
3955         struct bonding *bond = netdev_priv(bond_dev);
3956         struct slave *slave = NULL;
3957         struct list_head *iter;
3958 
3959         bond_for_each_slave_rcu(bond, slave, iter) {
3960                 if (bond_is_last_slave(bond, slave))
3961                         break;
3962                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3963                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3964 
3965                         if (!skb2) {
3966                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3967                                                     bond_dev->name, __func__);
3968                                 continue;
3969                         }
3970                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3971                 }
3972         }
3973         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3974                 bond_dev_queue_xmit(bond, skb, slave->dev);
3975         else
3976                 bond_tx_drop(bond_dev, skb);
3977 
3978         return NETDEV_TX_OK;
3979 }
3980 
3981 /*------------------------- Device initialization ---------------------------*/
3982 
3983 /* Lookup the slave that corresponds to a qid */
3984 static inline int bond_slave_override(struct bonding *bond,
3985                                       struct sk_buff *skb)
3986 {
3987         struct slave *slave = NULL;
3988         struct list_head *iter;
3989 
3990         if (!skb->queue_mapping)
3991                 return 1;
3992 
3993         /* Find out if any slaves have the same mapping as this skb. */
3994         bond_for_each_slave_rcu(bond, slave, iter) {
3995                 if (slave->queue_id == skb->queue_mapping) {
3996                         if (bond_slave_is_up(slave) &&
3997                             slave->link == BOND_LINK_UP) {
3998                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3999                                 return 0;
4000                         }
4001                         /* If the slave isn't UP, use default transmit policy. */
4002                         break;
4003                 }
4004         }
4005 
4006         return 1;
4007 }
4008 
4009 
4010 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4011                              void *accel_priv, select_queue_fallback_t fallback)
4012 {
4013         /* This helper function exists to help dev_pick_tx get the correct
4014          * destination queue.  Using a helper function skips a call to
4015          * skb_tx_hash and will put the skbs in the queue we expect on their
4016          * way down to the bonding driver.
4017          */
4018         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4019 
4020         /* Save the original txq to restore before passing to the driver */
4021         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4022 
4023         if (unlikely(txq >= dev->real_num_tx_queues)) {
4024                 do {
4025                         txq -= dev->real_num_tx_queues;
4026                 } while (txq >= dev->real_num_tx_queues);
4027         }
4028         return txq;
4029 }
4030 
4031 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4032 {
4033         struct bonding *bond = netdev_priv(dev);
4034 
4035         if (bond_should_override_tx_queue(bond) &&
4036             !bond_slave_override(bond, skb))
4037                 return NETDEV_TX_OK;
4038 
4039         switch (BOND_MODE(bond)) {
4040         case BOND_MODE_ROUNDROBIN:
4041                 return bond_xmit_roundrobin(skb, dev);
4042         case BOND_MODE_ACTIVEBACKUP:
4043                 return bond_xmit_activebackup(skb, dev);
4044         case BOND_MODE_8023AD:
4045         case BOND_MODE_XOR:
4046                 return bond_3ad_xor_xmit(skb, dev);
4047         case BOND_MODE_BROADCAST:
4048                 return bond_xmit_broadcast(skb, dev);
4049         case BOND_MODE_ALB:
4050                 return bond_alb_xmit(skb, dev);
4051         case BOND_MODE_TLB:
4052                 return bond_tlb_xmit(skb, dev);
4053         default:
4054                 /* Should never happen, mode already checked */
4055                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4056                 WARN_ON_ONCE(1);
4057                 bond_tx_drop(dev, skb);
4058                 return NETDEV_TX_OK;
4059         }
4060 }
4061 
4062 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4063 {
4064         struct bonding *bond = netdev_priv(dev);
4065         netdev_tx_t ret = NETDEV_TX_OK;
4066 
4067         /* If we risk deadlock from transmitting this in the
4068          * netpoll path, tell netpoll to queue the frame for later tx
4069          */
4070         if (unlikely(is_netpoll_tx_blocked(dev)))
4071                 return NETDEV_TX_BUSY;
4072 
4073         rcu_read_lock();
4074         if (bond_has_slaves(bond))
4075                 ret = __bond_start_xmit(skb, dev);
4076         else
4077                 bond_tx_drop(dev, skb);
4078         rcu_read_unlock();
4079 
4080         return ret;
4081 }
4082 
4083 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4084                                            struct ethtool_link_ksettings *cmd)
4085 {
4086         struct bonding *bond = netdev_priv(bond_dev);
4087         unsigned long speed = 0;
4088         struct list_head *iter;
4089         struct slave *slave;
4090 
4091         cmd->base.duplex = DUPLEX_UNKNOWN;
4092         cmd->base.port = PORT_OTHER;
4093 
4094         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4095          * do not need to check mode.  Though link speed might not represent
4096          * the true receive or transmit bandwidth (not all modes are symmetric)
4097          * this is an accurate maximum.
4098          */
4099         bond_for_each_slave(bond, slave, iter) {
4100                 if (bond_slave_can_tx(slave)) {
4101                         if (slave->speed != SPEED_UNKNOWN)
4102                                 speed += slave->speed;
4103                         if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4104                             slave->duplex != DUPLEX_UNKNOWN)
4105                                 cmd->base.duplex = slave->duplex;
4106                 }
4107         }
4108         cmd->base.speed = speed ? : SPEED_UNKNOWN;
4109 
4110         return 0;
4111 }
4112 
4113 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4114                                      struct ethtool_drvinfo *drvinfo)
4115 {
4116         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4117         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4118         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4119                  BOND_ABI_VERSION);
4120 }
4121 
4122 static const struct ethtool_ops bond_ethtool_ops = {
4123         .get_drvinfo            = bond_ethtool_get_drvinfo,
4124         .get_link               = ethtool_op_get_link,
4125         .get_link_ksettings     = bond_ethtool_get_link_ksettings,
4126 };
4127 
4128 static const struct net_device_ops bond_netdev_ops = {
4129         .ndo_init               = bond_init,
4130         .ndo_uninit             = bond_uninit,
4131         .ndo_open               = bond_open,
4132         .ndo_stop               = bond_close,
4133         .ndo_start_xmit         = bond_start_xmit,
4134         .ndo_select_queue       = bond_select_queue,
4135         .ndo_get_stats64        = bond_get_stats,
4136         .ndo_do_ioctl           = bond_do_ioctl,
4137         .ndo_change_rx_flags    = bond_change_rx_flags,
4138         .ndo_set_rx_mode        = bond_set_rx_mode,
4139         .ndo_change_mtu         = bond_change_mtu,
4140         .ndo_set_mac_address    = bond_set_mac_address,
4141         .ndo_neigh_setup        = bond_neigh_setup,
4142         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4143         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4144 #ifdef CONFIG_NET_POLL_CONTROLLER
4145         .ndo_netpoll_setup      = bond_netpoll_setup,
4146         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4147         .ndo_poll_controller    = bond_poll_controller,
4148 #endif
4149         .ndo_add_slave          = bond_enslave,
4150         .ndo_del_slave          = bond_release,
4151         .ndo_fix_features       = bond_fix_features,
4152         .ndo_neigh_construct    = netdev_default_l2upper_neigh_construct,
4153         .ndo_neigh_destroy      = netdev_default_l2upper_neigh_destroy,
4154         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
4155         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
4156         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
4157         .ndo_fdb_add            = switchdev_port_fdb_add,
4158         .ndo_fdb_del            = switchdev_port_fdb_del,
4159         .ndo_fdb_dump           = switchdev_port_fdb_dump,
4160         .ndo_features_check     = passthru_features_check,
4161 };
4162 
4163 static const struct device_type bond_type = {
4164         .name = "bond",
4165 };
4166 
4167 static void bond_destructor(struct net_device *bond_dev)
4168 {
4169         struct bonding *bond = netdev_priv(bond_dev);
4170         if (bond->wq)
4171                 destroy_workqueue(bond->wq);
4172         free_netdev(bond_dev);
4173 }
4174 
4175 void bond_setup(struct net_device *bond_dev)
4176 {
4177         struct bonding *bond = netdev_priv(bond_dev);
4178 
4179         spin_lock_init(&bond->mode_lock);
4180         spin_lock_init(&bond->stats_lock);
4181         bond->params = bonding_defaults;
4182 
4183         /* Initialize pointers */
4184         bond->dev = bond_dev;
4185 
4186         /* Initialize the device entry points */
4187         ether_setup(bond_dev);
4188         bond_dev->netdev_ops = &bond_netdev_ops;
4189         bond_dev->ethtool_ops = &bond_ethtool_ops;
4190 
4191         bond_dev->destructor = bond_destructor;
4192 
4193         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4194 
4195         /* Initialize the device options */
4196         bond_dev->flags |= IFF_MASTER;
4197         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4198         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4199 
4200         /* don't acquire bond device's netif_tx_lock when transmitting */
4201         bond_dev->features |= NETIF_F_LLTX;
4202 
4203         /* By default, we declare the bond to be fully
4204          * VLAN hardware accelerated capable. Special
4205          * care is taken in the various xmit functions
4206          * when there are slaves that are not hw accel
4207          * capable
4208          */
4209 
4210         /* Don't allow bond devices to change network namespaces. */
4211         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4212 
4213         bond_dev->hw_features = BOND_VLAN_FEATURES |
4214                                 NETIF_F_HW_VLAN_CTAG_TX |
4215                                 NETIF_F_HW_VLAN_CTAG_RX |
4216                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4217 
4218         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4219         bond_dev->features |= bond_dev->hw_features;
4220 }
4221 
4222 /* Destroy a bonding device.
4223  * Must be under rtnl_lock when this function is called.
4224  */
4225 static void bond_uninit(struct net_device *bond_dev)
4226 {
4227         struct bonding *bond = netdev_priv(bond_dev);
4228         struct list_head *iter;
4229         struct slave *slave;
4230         struct bond_up_slave *arr;
4231 
4232         bond_netpoll_cleanup(bond_dev);
4233 
4234         /* Release the bonded slaves */
4235         bond_for_each_slave(bond, slave, iter)
4236                 __bond_release_one(bond_dev, slave->dev, true);
4237         netdev_info(bond_dev, "Released all slaves\n");
4238 
4239         arr = rtnl_dereference(bond->slave_arr);
4240         if (arr) {
4241                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4242                 kfree_rcu(arr, rcu);
4243         }
4244 
4245         list_del(&bond->bond_list);
4246 
4247         bond_debug_unregister(bond);
4248 }
4249 
4250 /*------------------------- Module initialization ---------------------------*/
4251 
4252 static int bond_check_params(struct bond_params *params)
4253 {
4254         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4255         struct bond_opt_value newval;
4256         const struct bond_opt_value *valptr;
4257         int arp_all_targets_value;
4258         u16 ad_actor_sys_prio = 0;
4259         u16 ad_user_port_key = 0;
4260 
4261         /* Convert string parameters. */
4262         if (mode) {
4263                 bond_opt_initstr(&newval, mode);
4264                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4265                 if (!valptr) {
4266                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4267                         return -EINVAL;
4268                 }
4269                 bond_mode = valptr->value;
4270         }
4271 
4272         if (xmit_hash_policy) {
4273                 if ((bond_mode != BOND_MODE_XOR) &&
4274                     (bond_mode != BOND_MODE_8023AD) &&
4275                     (bond_mode != BOND_MODE_TLB)) {
4276                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4277                                 bond_mode_name(bond_mode));
4278                 } else {
4279                         bond_opt_initstr(&newval, xmit_hash_policy);
4280                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4281                                                 &newval);
4282                         if (!valptr) {
4283                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4284                                        xmit_hash_policy);
4285                                 return -EINVAL;
4286                         }
4287                         xmit_hashtype = valptr->value;
4288                 }
4289         }
4290 
4291         if (lacp_rate) {
4292                 if (bond_mode != BOND_MODE_8023AD) {
4293                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4294                                 bond_mode_name(bond_mode));
4295                 } else {
4296                         bond_opt_initstr(&newval, lacp_rate);
4297                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4298                                                 &newval);
4299                         if (!valptr) {
4300                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4301                                        lacp_rate);
4302                                 return -EINVAL;
4303                         }
4304                         lacp_fast = valptr->value;
4305                 }
4306         }
4307 
4308         if (ad_select) {
4309                 bond_opt_initstr(&newval, ad_select);
4310                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4311                                         &newval);
4312                 if (!valptr) {
4313                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4314                         return -EINVAL;
4315                 }
4316                 params->ad_select = valptr->value;
4317                 if (bond_mode != BOND_MODE_8023AD)
4318                         pr_warn("ad_select param only affects 802.3ad mode\n");
4319         } else {
4320                 params->ad_select = BOND_AD_STABLE;
4321         }
4322 
4323         if (max_bonds < 0) {
4324                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4325                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4326                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4327         }
4328 
4329         if (miimon < 0) {
4330                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4331                         miimon, INT_MAX);
4332                 miimon = 0;
4333         }
4334 
4335         if (updelay < 0) {
4336                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4337                         updelay, INT_MAX);
4338                 updelay = 0;
4339         }
4340 
4341         if (downdelay < 0) {
4342                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4343                         downdelay, INT_MAX);
4344                 downdelay = 0;
4345         }
4346 
4347         if ((use_carrier != 0) && (use_carrier != 1)) {
4348                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4349                         use_carrier);
4350                 use_carrier = 1;
4351         }
4352 
4353         if (num_peer_notif < 0 || num_peer_notif > 255) {
4354                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4355                         num_peer_notif);
4356                 num_peer_notif = 1;
4357         }
4358 
4359         /* reset values for 802.3ad/TLB/ALB */
4360         if (!bond_mode_uses_arp(bond_mode)) {
4361                 if (!miimon) {
4362                         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");
4363                         pr_warn("Forcing miimon to 100msec\n");
4364                         miimon = BOND_DEFAULT_MIIMON;
4365                 }
4366         }
4367 
4368         if (tx_queues < 1 || tx_queues > 255) {
4369                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4370                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4371                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4372         }
4373 
4374         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4375                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4376                         all_slaves_active);
4377                 all_slaves_active = 0;
4378         }
4379 
4380         if (resend_igmp < 0 || resend_igmp > 255) {
4381                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4382                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4383                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4384         }
4385 
4386         bond_opt_initval(&newval, packets_per_slave);
4387         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4388                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4389                         packets_per_slave, USHRT_MAX);
4390                 packets_per_slave = 1;
4391         }
4392 
4393         if (bond_mode == BOND_MODE_ALB) {
4394                 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",
4395                           updelay);
4396         }
4397 
4398         if (!miimon) {
4399                 if (updelay || downdelay) {
4400                         /* just warn the user the up/down delay will have
4401                          * no effect since miimon is zero...
4402                          */
4403                         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",
4404                                 updelay, downdelay);
4405                 }
4406         } else {
4407                 /* don't allow arp monitoring */
4408                 if (arp_interval) {
4409                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4410                                 miimon, arp_interval);
4411                         arp_interval = 0;
4412                 }
4413 
4414                 if ((updelay % miimon) != 0) {
4415                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4416                                 updelay, miimon, (updelay / miimon) * miimon);
4417                 }
4418 
4419                 updelay /= miimon;
4420 
4421                 if ((downdelay % miimon) != 0) {
4422                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4423                                 downdelay, miimon,
4424                                 (downdelay / miimon) * miimon);
4425                 }
4426 
4427                 downdelay /= miimon;
4428         }
4429 
4430         if (arp_interval < 0) {
4431                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4432                         arp_interval, INT_MAX);
4433                 arp_interval = 0;
4434         }
4435 
4436         for (arp_ip_count = 0, i = 0;
4437              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4438                 __be32 ip;
4439 
4440                 /* not a complete check, but good enough to catch mistakes */
4441                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4442                     !bond_is_ip_target_ok(ip)) {
4443                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4444                                 arp_ip_target[i]);
4445                         arp_interval = 0;
4446                 } else {
4447                         if (bond_get_targets_ip(arp_target, ip) == -1)
4448                                 arp_target[arp_ip_count++] = ip;
4449                         else
4450                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4451                                         &ip);
4452                 }
4453         }
4454 
4455         if (arp_interval && !arp_ip_count) {
4456                 /* don't allow arping if no arp_ip_target given... */
4457                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4458                         arp_interval);
4459                 arp_interval = 0;
4460         }
4461 
4462         if (arp_validate) {
4463                 if (!arp_interval) {
4464                         pr_err("arp_validate requires arp_interval\n");
4465                         return -EINVAL;
4466                 }
4467 
4468                 bond_opt_initstr(&newval, arp_validate);
4469                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4470                                         &newval);
4471                 if (!valptr) {
4472                         pr_err("Error: invalid arp_validate \"%s\"\n",
4473                                arp_validate);
4474                         return -EINVAL;
4475                 }
4476                 arp_validate_value = valptr->value;
4477         } else {
4478                 arp_validate_value = 0;
4479         }
4480 
4481         arp_all_targets_value = 0;
4482         if (arp_all_targets) {
4483                 bond_opt_initstr(&newval, arp_all_targets);
4484                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4485                                         &newval);
4486                 if (!valptr) {
4487                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4488                                arp_all_targets);
4489                         arp_all_targets_value = 0;
4490                 } else {
4491                         arp_all_targets_value = valptr->value;
4492                 }
4493         }
4494 
4495         if (miimon) {
4496                 pr_info("MII link monitoring set to %d ms\n", miimon);
4497         } else if (arp_interval) {
4498                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4499                                           arp_validate_value);
4500                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4501                         arp_interval, valptr->string, arp_ip_count);
4502 
4503                 for (i = 0; i < arp_ip_count; i++)
4504                         pr_cont(" %s", arp_ip_target[i]);
4505 
4506                 pr_cont("\n");
4507 
4508         } else if (max_bonds) {
4509                 /* miimon and arp_interval not set, we need one so things
4510                  * work as expected, see bonding.txt for details
4511                  */
4512                 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");
4513         }
4514 
4515         if (primary && !bond_mode_uses_primary(bond_mode)) {
4516                 /* currently, using a primary only makes sense
4517                  * in active backup, TLB or ALB modes
4518                  */
4519                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4520                         primary, bond_mode_name(bond_mode));
4521                 primary = NULL;
4522         }
4523 
4524         if (primary && primary_reselect) {
4525                 bond_opt_initstr(&newval, primary_reselect);
4526                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4527                                         &newval);
4528                 if (!valptr) {
4529                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4530                                primary_reselect);
4531                         return -EINVAL;
4532                 }
4533                 primary_reselect_value = valptr->value;
4534         } else {
4535                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4536         }
4537 
4538         if (fail_over_mac) {
4539                 bond_opt_initstr(&newval, fail_over_mac);
4540                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4541                                         &newval);
4542                 if (!valptr) {
4543                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4544                                fail_over_mac);
4545                         return -EINVAL;
4546                 }
4547                 fail_over_mac_value = valptr->value;
4548                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4549                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4550         } else {
4551                 fail_over_mac_value = BOND_FOM_NONE;
4552         }
4553 
4554         bond_opt_initstr(&newval, "default");
4555         valptr = bond_opt_parse(
4556                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4557                                      &newval);
4558         if (!valptr) {
4559                 pr_err("Error: No ad_actor_sys_prio default value");
4560                 return -EINVAL;
4561         }
4562         ad_actor_sys_prio = valptr->value;
4563 
4564         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4565                                 &newval);
4566         if (!valptr) {
4567                 pr_err("Error: No ad_user_port_key default value");
4568                 return -EINVAL;
4569         }
4570         ad_user_port_key = valptr->value;
4571 
4572         if (lp_interval == 0) {
4573                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4574                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4575                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4576         }
4577 
4578         /* fill params struct with the proper values */
4579         params->mode = bond_mode;
4580         params->xmit_policy = xmit_hashtype;
4581         params->miimon = miimon;
4582         params->num_peer_notif = num_peer_notif;
4583         params->arp_interval = arp_interval;
4584         params->arp_validate = arp_validate_value;
4585         params->arp_all_targets = arp_all_targets_value;
4586         params->updelay = updelay;
4587         params->downdelay = downdelay;
4588         params->use_carrier = use_carrier;
4589         params->lacp_fast = lacp_fast;
4590         params->primary[0] = 0;
4591         params->primary_reselect = primary_reselect_value;
4592         params->fail_over_mac = fail_over_mac_value;
4593         params->tx_queues = tx_queues;
4594         params->all_slaves_active = all_slaves_active;
4595         params->resend_igmp = resend_igmp;
4596         params->min_links = min_links;
4597         params->lp_interval = lp_interval;
4598         params->packets_per_slave = packets_per_slave;
4599         params->tlb_dynamic_lb = 1; /* Default value */
4600         params->ad_actor_sys_prio = ad_actor_sys_prio;
4601         eth_zero_addr(params->ad_actor_system);
4602         params->ad_user_port_key = ad_user_port_key;
4603         if (packets_per_slave > 0) {
4604                 params->reciprocal_packets_per_slave =
4605                         reciprocal_value(packets_per_slave);
4606         } else {
4607                 /* reciprocal_packets_per_slave is unused if
4608                  * packets_per_slave is 0 or 1, just initialize it
4609                  */
4610                 params->reciprocal_packets_per_slave =
4611                         (struct reciprocal_value) { 0 };
4612         }
4613 
4614         if (primary) {
4615                 strncpy(params->primary, primary, IFNAMSIZ);
4616                 params->primary[IFNAMSIZ - 1] = 0;
4617         }
4618 
4619         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4620 
4621         return 0;
4622 }
4623 
4624 /* Called from registration process */
4625 static int bond_init(struct net_device *bond_dev)
4626 {
4627         struct bonding *bond = netdev_priv(bond_dev);
4628         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4629 
4630         netdev_dbg(bond_dev, "Begin bond_init\n");
4631 
4632         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4633         if (!bond->wq)
4634                 return -ENOMEM;
4635 
4636         netdev_lockdep_set_classes(bond_dev);
4637 
4638         list_add_tail(&bond->bond_list, &bn->dev_list);
4639 
4640         bond_prepare_sysfs_group(bond);
4641 
4642         bond_debug_register(bond);
4643 
4644         /* Ensure valid dev_addr */
4645         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4646             bond_dev->addr_assign_type == NET_ADDR_PERM)
4647                 eth_hw_addr_random(bond_dev);
4648 
4649         return 0;
4650 }
4651 
4652 unsigned int bond_get_num_tx_queues(void)
4653 {
4654         return tx_queues;
4655 }
4656 
4657 /* Create a new bond based on the specified name and bonding parameters.
4658  * If name is NULL, obtain a suitable "bond%d" name for us.
4659  * Caller must NOT hold rtnl_lock; we need to release it here before we
4660  * set up our sysfs entries.
4661  */
4662 int bond_create(struct net *net, const char *name)
4663 {
4664         struct net_device *bond_dev;
4665         struct bonding *bond;
4666         struct alb_bond_info *bond_info;
4667         int res;
4668 
4669         rtnl_lock();
4670 
4671         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4672                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4673                                    bond_setup, tx_queues);
4674         if (!bond_dev) {
4675                 pr_err("%s: eek! can't alloc netdev!\n", name);
4676                 rtnl_unlock();
4677                 return -ENOMEM;
4678         }
4679 
4680         /*
4681          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4682          * It is set to 0 by default which is wrong.
4683          */
4684         bond = netdev_priv(bond_dev);
4685         bond_info = &(BOND_ALB_INFO(bond));
4686         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4687 
4688         dev_net_set(bond_dev, net);
4689         bond_dev->rtnl_link_ops = &bond_link_ops;
4690 
4691         res = register_netdevice(bond_dev);
4692 
4693         netif_carrier_off(bond_dev);
4694 
4695         rtnl_unlock();
4696         if (res < 0)
4697                 bond_destructor(bond_dev);
4698         return res;
4699 }
4700 
4701 static int __net_init bond_net_init(struct net *net)
4702 {
4703         struct bond_net *bn = net_generic(net, bond_net_id);
4704 
4705         bn->net = net;
4706         INIT_LIST_HEAD(&bn->dev_list);
4707 
4708         bond_create_proc_dir(bn);
4709         bond_create_sysfs(bn);
4710 
4711         return 0;
4712 }
4713 
4714 static void __net_exit bond_net_exit(struct net *net)
4715 {
4716         struct bond_net *bn = net_generic(net, bond_net_id);
4717         struct bonding *bond, *tmp_bond;
4718         LIST_HEAD(list);
4719 
4720         bond_destroy_sysfs(bn);
4721 
4722         /* Kill off any bonds created after unregistering bond rtnl ops */
4723         rtnl_lock();
4724         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4725                 unregister_netdevice_queue(bond->dev, &list);
4726         unregister_netdevice_many(&list);
4727         rtnl_unlock();
4728 
4729         bond_destroy_proc_dir(bn);
4730 }
4731 
4732 static struct pernet_operations bond_net_ops = {
4733         .init = bond_net_init,
4734         .exit = bond_net_exit,
4735         .id   = &bond_net_id,
4736         .size = sizeof(struct bond_net),
4737 };
4738 
4739 static int __init bonding_init(void)
4740 {
4741         int i;
4742         int res;
4743 
4744         pr_info("%s", bond_version);
4745 
4746         res = bond_check_params(&bonding_defaults);
4747         if (res)
4748                 goto out;
4749 
4750         res = register_pernet_subsys(&bond_net_ops);
4751         if (res)
4752                 goto out;
4753 
4754         res = bond_netlink_init();
4755         if (res)
4756                 goto err_link;
4757 
4758         bond_create_debugfs();
4759 
4760         for (i = 0; i < max_bonds; i++) {
4761                 res = bond_create(&init_net, NULL);
4762                 if (res)
4763                         goto err;
4764         }
4765 
4766         register_netdevice_notifier(&bond_netdev_notifier);
4767 out:
4768         return res;
4769 err:
4770         bond_destroy_debugfs();
4771         bond_netlink_fini();
4772 err_link:
4773         unregister_pernet_subsys(&bond_net_ops);
4774         goto out;
4775 
4776 }
4777 
4778 static void __exit bonding_exit(void)
4779 {
4780         unregister_netdevice_notifier(&bond_netdev_notifier);
4781 
4782         bond_destroy_debugfs();
4783 
4784         bond_netlink_fini();
4785         unregister_pernet_subsys(&bond_net_ops);
4786 
4787 #ifdef CONFIG_NET_POLL_CONTROLLER
4788         /* Make sure we don't have an imbalance on our netpoll blocking */
4789         WARN_ON(atomic_read(&netpoll_block_tx));
4790 #endif
4791 }
4792 
4793 module_init(bonding_init);
4794 module_exit(bonding_exit);
4795 MODULE_LICENSE("GPL");
4796 MODULE_VERSION(DRV_VERSION);
4797 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4798 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4799 

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