Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4

Linux/drivers/net/bonding/bond_main.c

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

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