Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

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         rcu_read_lock_bh();
983         bond_for_each_slave_rcu(bond, slave, iter) {
984                 ops = slave->dev->netdev_ops;
985                 if (!bond_slave_is_up(slave) || !ops->ndo_poll_controller)
986                         continue;
987 
988                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
989                         struct aggregator *agg =
990                             SLAVE_AD_INFO(slave)->port.aggregator;
991 
992                         if (agg &&
993                             agg->aggregator_identifier != ad_info.aggregator_id)
994                                 continue;
995                 }
996 
997                 ni = rcu_dereference_bh(slave->dev->npinfo);
998                 if (down_trylock(&ni->dev_lock))
999                         continue;
1000                 ops->ndo_poll_controller(slave->dev);
1001                 up(&ni->dev_lock);
1002         }
1003         rcu_read_unlock_bh();
1004 }
1005 
1006 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1007 {
1008         struct bonding *bond = netdev_priv(bond_dev);
1009         struct list_head *iter;
1010         struct slave *slave;
1011 
1012         bond_for_each_slave(bond, slave, iter)
1013                 if (bond_slave_is_up(slave))
1014                         slave_disable_netpoll(slave);
1015 }
1016 
1017 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1018 {
1019         struct bonding *bond = netdev_priv(dev);
1020         struct list_head *iter;
1021         struct slave *slave;
1022         int err = 0;
1023 
1024         bond_for_each_slave(bond, slave, iter) {
1025                 err = slave_enable_netpoll(slave);
1026                 if (err) {
1027                         bond_netpoll_cleanup(dev);
1028                         break;
1029                 }
1030         }
1031         return err;
1032 }
1033 #else
1034 static inline int slave_enable_netpoll(struct slave *slave)
1035 {
1036         return 0;
1037 }
1038 static inline void slave_disable_netpoll(struct slave *slave)
1039 {
1040 }
1041 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1042 {
1043 }
1044 #endif
1045 
1046 /*---------------------------------- IOCTL ----------------------------------*/
1047 
1048 static netdev_features_t bond_fix_features(struct net_device *dev,
1049                                            netdev_features_t features)
1050 {
1051         struct bonding *bond = netdev_priv(dev);
1052         struct list_head *iter;
1053         netdev_features_t mask;
1054         struct slave *slave;
1055 
1056         mask = features;
1057 
1058         features &= ~NETIF_F_ONE_FOR_ALL;
1059         features |= NETIF_F_ALL_FOR_ALL;
1060 
1061         bond_for_each_slave(bond, slave, iter) {
1062                 features = netdev_increment_features(features,
1063                                                      slave->dev->features,
1064                                                      mask);
1065         }
1066         features = netdev_add_tso_features(features, mask);
1067 
1068         return features;
1069 }
1070 
1071 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1072                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1073                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1074 
1075 #define BOND_ENC_FEATURES       (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1076                                  NETIF_F_TSO)
1077 
1078 static void bond_compute_features(struct bonding *bond)
1079 {
1080         unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1081                                         IFF_XMIT_DST_RELEASE_PERM;
1082         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1083         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1084         struct net_device *bond_dev = bond->dev;
1085         struct list_head *iter;
1086         struct slave *slave;
1087         unsigned short max_hard_header_len = ETH_HLEN;
1088         unsigned int gso_max_size = GSO_MAX_SIZE;
1089         u16 gso_max_segs = GSO_MAX_SEGS;
1090 
1091         if (!bond_has_slaves(bond))
1092                 goto done;
1093         vlan_features &= NETIF_F_ALL_FOR_ALL;
1094 
1095         bond_for_each_slave(bond, slave, iter) {
1096                 vlan_features = netdev_increment_features(vlan_features,
1097                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1098 
1099                 enc_features = netdev_increment_features(enc_features,
1100                                                          slave->dev->hw_enc_features,
1101                                                          BOND_ENC_FEATURES);
1102                 dst_release_flag &= slave->dev->priv_flags;
1103                 if (slave->dev->hard_header_len > max_hard_header_len)
1104                         max_hard_header_len = slave->dev->hard_header_len;
1105 
1106                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1107                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1108         }
1109 
1110 done:
1111         bond_dev->vlan_features = vlan_features;
1112         bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL;
1113         bond_dev->hard_header_len = max_hard_header_len;
1114         bond_dev->gso_max_segs = gso_max_segs;
1115         netif_set_gso_max_size(bond_dev, gso_max_size);
1116 
1117         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1118         if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1119             dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1120                 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1121 
1122         netdev_change_features(bond_dev);
1123 }
1124 
1125 static void bond_setup_by_slave(struct net_device *bond_dev,
1126                                 struct net_device *slave_dev)
1127 {
1128         bond_dev->header_ops        = slave_dev->header_ops;
1129 
1130         bond_dev->type              = slave_dev->type;
1131         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1132         bond_dev->addr_len          = slave_dev->addr_len;
1133 
1134         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1135                 slave_dev->addr_len);
1136 }
1137 
1138 /* On bonding slaves other than the currently active slave, suppress
1139  * duplicates except for alb non-mcast/bcast.
1140  */
1141 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1142                                             struct slave *slave,
1143                                             struct bonding *bond)
1144 {
1145         if (bond_is_slave_inactive(slave)) {
1146                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1147                     skb->pkt_type != PACKET_BROADCAST &&
1148                     skb->pkt_type != PACKET_MULTICAST)
1149                         return false;
1150                 return true;
1151         }
1152         return false;
1153 }
1154 
1155 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1156 {
1157         struct sk_buff *skb = *pskb;
1158         struct slave *slave;
1159         struct bonding *bond;
1160         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1161                           struct slave *);
1162         int ret = RX_HANDLER_ANOTHER;
1163 
1164         skb = skb_share_check(skb, GFP_ATOMIC);
1165         if (unlikely(!skb))
1166                 return RX_HANDLER_CONSUMED;
1167 
1168         *pskb = skb;
1169 
1170         slave = bond_slave_get_rcu(skb->dev);
1171         bond = slave->bond;
1172 
1173         recv_probe = ACCESS_ONCE(bond->recv_probe);
1174         if (recv_probe) {
1175                 ret = recv_probe(skb, bond, slave);
1176                 if (ret == RX_HANDLER_CONSUMED) {
1177                         consume_skb(skb);
1178                         return ret;
1179                 }
1180         }
1181 
1182         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1183                 return RX_HANDLER_EXACT;
1184         }
1185 
1186         skb->dev = bond->dev;
1187 
1188         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1189             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1190             skb->pkt_type == PACKET_HOST) {
1191 
1192                 if (unlikely(skb_cow_head(skb,
1193                                           skb->data - skb_mac_header(skb)))) {
1194                         kfree_skb(skb);
1195                         return RX_HANDLER_CONSUMED;
1196                 }
1197                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1198         }
1199 
1200         return ret;
1201 }
1202 
1203 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1204                                       struct net_device *slave_dev,
1205                                       struct slave *slave)
1206 {
1207         int err;
1208 
1209         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1210         if (err)
1211                 return err;
1212         slave_dev->flags |= IFF_SLAVE;
1213         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1214         return 0;
1215 }
1216 
1217 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1218                                   struct net_device *slave_dev)
1219 {
1220         netdev_upper_dev_unlink(slave_dev, bond_dev);
1221         slave_dev->flags &= ~IFF_SLAVE;
1222         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1223 }
1224 
1225 static struct slave *bond_alloc_slave(struct bonding *bond)
1226 {
1227         struct slave *slave = NULL;
1228 
1229         slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1230         if (!slave)
1231                 return NULL;
1232 
1233         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1234                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1235                                                GFP_KERNEL);
1236                 if (!SLAVE_AD_INFO(slave)) {
1237                         kfree(slave);
1238                         return NULL;
1239                 }
1240         }
1241         return slave;
1242 }
1243 
1244 static void bond_free_slave(struct slave *slave)
1245 {
1246         struct bonding *bond = bond_get_bond_by_slave(slave);
1247 
1248         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1249                 kfree(SLAVE_AD_INFO(slave));
1250 
1251         kfree(slave);
1252 }
1253 
1254 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1255 {
1256         info->bond_mode = BOND_MODE(bond);
1257         info->miimon = bond->params.miimon;
1258         info->num_slaves = bond->slave_cnt;
1259 }
1260 
1261 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1262 {
1263         strcpy(info->slave_name, slave->dev->name);
1264         info->link = slave->link;
1265         info->state = bond_slave_state(slave);
1266         info->link_failure_count = slave->link_failure_count;
1267 }
1268 
1269 static void bond_netdev_notify(struct net_device *dev,
1270                                struct netdev_bonding_info *info)
1271 {
1272         rtnl_lock();
1273         netdev_bonding_info_change(dev, info);
1274         rtnl_unlock();
1275 }
1276 
1277 static void bond_netdev_notify_work(struct work_struct *_work)
1278 {
1279         struct netdev_notify_work *w =
1280                 container_of(_work, struct netdev_notify_work, work.work);
1281 
1282         bond_netdev_notify(w->dev, &w->bonding_info);
1283         dev_put(w->dev);
1284         kfree(w);
1285 }
1286 
1287 void bond_queue_slave_event(struct slave *slave)
1288 {
1289         struct bonding *bond = slave->bond;
1290         struct netdev_notify_work *nnw = kzalloc(sizeof(*nnw), GFP_ATOMIC);
1291 
1292         if (!nnw)
1293                 return;
1294 
1295         dev_hold(slave->dev);
1296         nnw->dev = slave->dev;
1297         bond_fill_ifslave(slave, &nnw->bonding_info.slave);
1298         bond_fill_ifbond(bond, &nnw->bonding_info.master);
1299         INIT_DELAYED_WORK(&nnw->work, bond_netdev_notify_work);
1300 
1301         queue_delayed_work(slave->bond->wq, &nnw->work, 0);
1302 }
1303 
1304 /* enslave device <slave> to bond device <master> */
1305 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1306 {
1307         struct bonding *bond = netdev_priv(bond_dev);
1308         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1309         struct slave *new_slave = NULL, *prev_slave;
1310         struct sockaddr addr;
1311         int link_reporting;
1312         int res = 0, i;
1313 
1314         if (!bond->params.use_carrier &&
1315             slave_dev->ethtool_ops->get_link == NULL &&
1316             slave_ops->ndo_do_ioctl == NULL) {
1317                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1318                             slave_dev->name);
1319         }
1320 
1321         /* already enslaved */
1322         if (slave_dev->flags & IFF_SLAVE) {
1323                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1324                 return -EBUSY;
1325         }
1326 
1327         if (bond_dev == slave_dev) {
1328                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1329                 return -EPERM;
1330         }
1331 
1332         /* vlan challenged mutual exclusion */
1333         /* no need to lock since we're protected by rtnl_lock */
1334         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1335                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1336                            slave_dev->name);
1337                 if (vlan_uses_dev(bond_dev)) {
1338                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1339                                    slave_dev->name, bond_dev->name);
1340                         return -EPERM;
1341                 } else {
1342                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1343                                     slave_dev->name, slave_dev->name,
1344                                     bond_dev->name);
1345                 }
1346         } else {
1347                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1348                            slave_dev->name);
1349         }
1350 
1351         /* Old ifenslave binaries are no longer supported.  These can
1352          * be identified with moderate accuracy by the state of the slave:
1353          * the current ifenslave will set the interface down prior to
1354          * enslaving it; the old ifenslave will not.
1355          */
1356         if ((slave_dev->flags & IFF_UP)) {
1357                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1358                            slave_dev->name);
1359                 res = -EPERM;
1360                 goto err_undo_flags;
1361         }
1362 
1363         /* set bonding device ether type by slave - bonding netdevices are
1364          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1365          * there is a need to override some of the type dependent attribs/funcs.
1366          *
1367          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1368          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1369          */
1370         if (!bond_has_slaves(bond)) {
1371                 if (bond_dev->type != slave_dev->type) {
1372                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1373                                    bond_dev->type, slave_dev->type);
1374 
1375                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1376                                                        bond_dev);
1377                         res = notifier_to_errno(res);
1378                         if (res) {
1379                                 netdev_err(bond_dev, "refused to change device type\n");
1380                                 res = -EBUSY;
1381                                 goto err_undo_flags;
1382                         }
1383 
1384                         /* Flush unicast and multicast addresses */
1385                         dev_uc_flush(bond_dev);
1386                         dev_mc_flush(bond_dev);
1387 
1388                         if (slave_dev->type != ARPHRD_ETHER)
1389                                 bond_setup_by_slave(bond_dev, slave_dev);
1390                         else {
1391                                 ether_setup(bond_dev);
1392                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1393                         }
1394 
1395                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1396                                                  bond_dev);
1397                 }
1398         } else if (bond_dev->type != slave_dev->type) {
1399                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1400                            slave_dev->name, slave_dev->type, bond_dev->type);
1401                 res = -EINVAL;
1402                 goto err_undo_flags;
1403         }
1404 
1405         if (slave_ops->ndo_set_mac_address == NULL) {
1406                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1407                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1408                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1409                         if (!bond_has_slaves(bond)) {
1410                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1411                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1412                         } else {
1413                                 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");
1414                                 res = -EOPNOTSUPP;
1415                                 goto err_undo_flags;
1416                         }
1417                 }
1418         }
1419 
1420         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1421 
1422         /* If this is the first slave, then we need to set the master's hardware
1423          * address to be the same as the slave's.
1424          */
1425         if (!bond_has_slaves(bond) &&
1426             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1427                 bond_set_dev_addr(bond->dev, slave_dev);
1428 
1429         new_slave = bond_alloc_slave(bond);
1430         if (!new_slave) {
1431                 res = -ENOMEM;
1432                 goto err_undo_flags;
1433         }
1434 
1435         new_slave->bond = bond;
1436         new_slave->dev = slave_dev;
1437         /* Set the new_slave's queue_id to be zero.  Queue ID mapping
1438          * is set via sysfs or module option if desired.
1439          */
1440         new_slave->queue_id = 0;
1441 
1442         /* Save slave's original mtu and then set it to match the bond */
1443         new_slave->original_mtu = slave_dev->mtu;
1444         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1445         if (res) {
1446                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1447                 goto err_free;
1448         }
1449 
1450         /* Save slave's original ("permanent") mac address for modes
1451          * that need it, and for restoring it upon release, and then
1452          * set it to the master's address
1453          */
1454         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1455 
1456         if (!bond->params.fail_over_mac ||
1457             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1458                 /* Set slave to master's mac address.  The application already
1459                  * set the master's mac address to that of the first slave
1460                  */
1461                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1462                 addr.sa_family = slave_dev->type;
1463                 res = dev_set_mac_address(slave_dev, &addr);
1464                 if (res) {
1465                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1466                         goto err_restore_mtu;
1467                 }
1468         }
1469 
1470         /* open the slave since the application closed it */
1471         res = dev_open(slave_dev);
1472         if (res) {
1473                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1474                 goto err_restore_mac;
1475         }
1476 
1477         slave_dev->priv_flags |= IFF_BONDING;
1478         /* initialize slave stats */
1479         dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1480 
1481         if (bond_is_lb(bond)) {
1482                 /* bond_alb_init_slave() must be called before all other stages since
1483                  * it might fail and we do not want to have to undo everything
1484                  */
1485                 res = bond_alb_init_slave(bond, new_slave);
1486                 if (res)
1487                         goto err_close;
1488         }
1489 
1490         /* If the mode uses primary, then the following is handled by
1491          * bond_change_active_slave().
1492          */
1493         if (!bond_uses_primary(bond)) {
1494                 /* set promiscuity level to new slave */
1495                 if (bond_dev->flags & IFF_PROMISC) {
1496                         res = dev_set_promiscuity(slave_dev, 1);
1497                         if (res)
1498                                 goto err_close;
1499                 }
1500 
1501                 /* set allmulti level to new slave */
1502                 if (bond_dev->flags & IFF_ALLMULTI) {
1503                         res = dev_set_allmulti(slave_dev, 1);
1504                         if (res)
1505                                 goto err_close;
1506                 }
1507 
1508                 netif_addr_lock_bh(bond_dev);
1509 
1510                 dev_mc_sync_multiple(slave_dev, bond_dev);
1511                 dev_uc_sync_multiple(slave_dev, bond_dev);
1512 
1513                 netif_addr_unlock_bh(bond_dev);
1514         }
1515 
1516         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1517                 /* add lacpdu mc addr to mc list */
1518                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1519 
1520                 dev_mc_add(slave_dev, lacpdu_multicast);
1521         }
1522 
1523         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1524         if (res) {
1525                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1526                            slave_dev->name);
1527                 goto err_close;
1528         }
1529 
1530         prev_slave = bond_last_slave(bond);
1531 
1532         new_slave->delay = 0;
1533         new_slave->link_failure_count = 0;
1534 
1535         bond_update_speed_duplex(new_slave);
1536 
1537         new_slave->last_rx = jiffies -
1538                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1539         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1540                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1541 
1542         if (bond->params.miimon && !bond->params.use_carrier) {
1543                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1544 
1545                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1546                         /* miimon is set but a bonded network driver
1547                          * does not support ETHTOOL/MII and
1548                          * arp_interval is not set.  Note: if
1549                          * use_carrier is enabled, we will never go
1550                          * here (because netif_carrier is always
1551                          * supported); thus, we don't need to change
1552                          * the messages for netif_carrier.
1553                          */
1554                         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",
1555                                     slave_dev->name);
1556                 } else if (link_reporting == -1) {
1557                         /* unable get link status using mii/ethtool */
1558                         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",
1559                                     slave_dev->name);
1560                 }
1561         }
1562 
1563         /* check for initial state */
1564         if (bond->params.miimon) {
1565                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1566                         if (bond->params.updelay) {
1567                                 bond_set_slave_link_state(new_slave,
1568                                                           BOND_LINK_BACK);
1569                                 new_slave->delay = bond->params.updelay;
1570                         } else {
1571                                 bond_set_slave_link_state(new_slave,
1572                                                           BOND_LINK_UP);
1573                         }
1574                 } else {
1575                         bond_set_slave_link_state(new_slave, BOND_LINK_DOWN);
1576                 }
1577         } else if (bond->params.arp_interval) {
1578                 bond_set_slave_link_state(new_slave,
1579                                           (netif_carrier_ok(slave_dev) ?
1580                                           BOND_LINK_UP : BOND_LINK_DOWN));
1581         } else {
1582                 bond_set_slave_link_state(new_slave, BOND_LINK_UP);
1583         }
1584 
1585         if (new_slave->link != BOND_LINK_DOWN)
1586                 new_slave->last_link_up = jiffies;
1587         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1588                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1589                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1590 
1591         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1592                 /* if there is a primary slave, remember it */
1593                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1594                         rcu_assign_pointer(bond->primary_slave, new_slave);
1595                         bond->force_primary = true;
1596                 }
1597         }
1598 
1599         switch (BOND_MODE(bond)) {
1600         case BOND_MODE_ACTIVEBACKUP:
1601                 bond_set_slave_inactive_flags(new_slave,
1602                                               BOND_SLAVE_NOTIFY_NOW);
1603                 break;
1604         case BOND_MODE_8023AD:
1605                 /* in 802.3ad mode, the internal mechanism
1606                  * will activate the slaves in the selected
1607                  * aggregator
1608                  */
1609                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1610                 /* if this is the first slave */
1611                 if (!prev_slave) {
1612                         SLAVE_AD_INFO(new_slave)->id = 1;
1613                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1614                          * can be called only after the mac address of the bond is set
1615                          */
1616                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1617                 } else {
1618                         SLAVE_AD_INFO(new_slave)->id =
1619                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1620                 }
1621 
1622                 bond_3ad_bind_slave(new_slave);
1623                 break;
1624         case BOND_MODE_TLB:
1625         case BOND_MODE_ALB:
1626                 bond_set_active_slave(new_slave);
1627                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1628                 break;
1629         default:
1630                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1631 
1632                 /* always active in trunk mode */
1633                 bond_set_active_slave(new_slave);
1634 
1635                 /* In trunking mode there is little meaning to curr_active_slave
1636                  * anyway (it holds no special properties of the bond device),
1637                  * so we can change it without calling change_active_interface()
1638                  */
1639                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1640                     new_slave->link == BOND_LINK_UP)
1641                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1642 
1643                 break;
1644         } /* switch(bond_mode) */
1645 
1646 #ifdef CONFIG_NET_POLL_CONTROLLER
1647         slave_dev->npinfo = bond->dev->npinfo;
1648         if (slave_dev->npinfo) {
1649                 if (slave_enable_netpoll(new_slave)) {
1650                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1651                         res = -EBUSY;
1652                         goto err_detach;
1653                 }
1654         }
1655 #endif
1656 
1657         if (!(bond_dev->features & NETIF_F_LRO))
1658                 dev_disable_lro(slave_dev);
1659 
1660         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1661                                          new_slave);
1662         if (res) {
1663                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1664                 goto err_detach;
1665         }
1666 
1667         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1668         if (res) {
1669                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1670                 goto err_unregister;
1671         }
1672 
1673         res = bond_sysfs_slave_add(new_slave);
1674         if (res) {
1675                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1676                 goto err_upper_unlink;
1677         }
1678 
1679         bond->slave_cnt++;
1680         bond_compute_features(bond);
1681         bond_set_carrier(bond);
1682 
1683         if (bond_uses_primary(bond)) {
1684                 block_netpoll_tx();
1685                 bond_select_active_slave(bond);
1686                 unblock_netpoll_tx();
1687         }
1688 
1689         if (bond_mode_uses_xmit_hash(bond))
1690                 bond_update_slave_arr(bond, NULL);
1691 
1692         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1693                     slave_dev->name,
1694                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1695                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1696 
1697         /* enslave is successful */
1698         bond_queue_slave_event(new_slave);
1699         return 0;
1700 
1701 /* Undo stages on error */
1702 err_upper_unlink:
1703         bond_upper_dev_unlink(bond_dev, slave_dev);
1704 
1705 err_unregister:
1706         netdev_rx_handler_unregister(slave_dev);
1707 
1708 err_detach:
1709         if (!bond_uses_primary(bond))
1710                 bond_hw_addr_flush(bond_dev, slave_dev);
1711 
1712         vlan_vids_del_by_dev(slave_dev, bond_dev);
1713         if (rcu_access_pointer(bond->primary_slave) == new_slave)
1714                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1715         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1716                 block_netpoll_tx();
1717                 bond_change_active_slave(bond, NULL);
1718                 bond_select_active_slave(bond);
1719                 unblock_netpoll_tx();
1720         }
1721         /* either primary_slave or curr_active_slave might've changed */
1722         synchronize_rcu();
1723         slave_disable_netpoll(new_slave);
1724 
1725 err_close:
1726         slave_dev->priv_flags &= ~IFF_BONDING;
1727         dev_close(slave_dev);
1728 
1729 err_restore_mac:
1730         if (!bond->params.fail_over_mac ||
1731             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1732                 /* XXX TODO - fom follow mode needs to change master's
1733                  * MAC if this slave's MAC is in use by the bond, or at
1734                  * least print a warning.
1735                  */
1736                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1737                 addr.sa_family = slave_dev->type;
1738                 dev_set_mac_address(slave_dev, &addr);
1739         }
1740 
1741 err_restore_mtu:
1742         dev_set_mtu(slave_dev, new_slave->original_mtu);
1743 
1744 err_free:
1745         bond_free_slave(new_slave);
1746 
1747 err_undo_flags:
1748         /* Enslave of first slave has failed and we need to fix master's mac */
1749         if (!bond_has_slaves(bond)) {
1750                 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1751                                             slave_dev->dev_addr))
1752                         eth_hw_addr_random(bond_dev);
1753                 if (bond_dev->type != ARPHRD_ETHER) {
1754                         ether_setup(bond_dev);
1755                         bond_dev->flags |= IFF_MASTER;
1756                         bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1757                 }
1758         }
1759 
1760         return res;
1761 }
1762 
1763 /* Try to release the slave device <slave> from the bond device <master>
1764  * It is legal to access curr_active_slave without a lock because all the function
1765  * is RTNL-locked. If "all" is true it means that the function is being called
1766  * while destroying a bond interface and all slaves are being released.
1767  *
1768  * The rules for slave state should be:
1769  *   for Active/Backup:
1770  *     Active stays on all backups go down
1771  *   for Bonded connections:
1772  *     The first up interface should be left on and all others downed.
1773  */
1774 static int __bond_release_one(struct net_device *bond_dev,
1775                               struct net_device *slave_dev,
1776                               bool all)
1777 {
1778         struct bonding *bond = netdev_priv(bond_dev);
1779         struct slave *slave, *oldcurrent;
1780         struct sockaddr addr;
1781         int old_flags = bond_dev->flags;
1782         netdev_features_t old_features = bond_dev->features;
1783 
1784         /* slave is not a slave or master is not master of this slave */
1785         if (!(slave_dev->flags & IFF_SLAVE) ||
1786             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1787                 netdev_dbg(bond_dev, "cannot release %s\n",
1788                            slave_dev->name);
1789                 return -EINVAL;
1790         }
1791 
1792         block_netpoll_tx();
1793 
1794         slave = bond_get_slave_by_dev(bond, slave_dev);
1795         if (!slave) {
1796                 /* not a slave of this bond */
1797                 netdev_info(bond_dev, "%s not enslaved\n",
1798                             slave_dev->name);
1799                 unblock_netpoll_tx();
1800                 return -EINVAL;
1801         }
1802 
1803         bond_sysfs_slave_del(slave);
1804 
1805         /* recompute stats just before removing the slave */
1806         bond_get_stats(bond->dev, &bond->bond_stats);
1807 
1808         bond_upper_dev_unlink(bond_dev, slave_dev);
1809         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1810          * for this slave anymore.
1811          */
1812         netdev_rx_handler_unregister(slave_dev);
1813 
1814         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1815                 bond_3ad_unbind_slave(slave);
1816 
1817         if (bond_mode_uses_xmit_hash(bond))
1818                 bond_update_slave_arr(bond, slave);
1819 
1820         netdev_info(bond_dev, "Releasing %s interface %s\n",
1821                     bond_is_active_slave(slave) ? "active" : "backup",
1822                     slave_dev->name);
1823 
1824         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1825 
1826         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1827 
1828         if (!all && (!bond->params.fail_over_mac ||
1829                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1830                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1831                     bond_has_slaves(bond))
1832                         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",
1833                                     slave_dev->name, slave->perm_hwaddr,
1834                                     bond_dev->name, slave_dev->name);
1835         }
1836 
1837         if (rtnl_dereference(bond->primary_slave) == slave)
1838                 RCU_INIT_POINTER(bond->primary_slave, NULL);
1839 
1840         if (oldcurrent == slave)
1841                 bond_change_active_slave(bond, NULL);
1842 
1843         if (bond_is_lb(bond)) {
1844                 /* Must be called only after the slave has been
1845                  * detached from the list and the curr_active_slave
1846                  * has been cleared (if our_slave == old_current),
1847                  * but before a new active slave is selected.
1848                  */
1849                 bond_alb_deinit_slave(bond, slave);
1850         }
1851 
1852         if (all) {
1853                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1854         } else if (oldcurrent == slave) {
1855                 /* Note that we hold RTNL over this sequence, so there
1856                  * is no concern that another slave add/remove event
1857                  * will interfere.
1858                  */
1859                 bond_select_active_slave(bond);
1860         }
1861 
1862         if (!bond_has_slaves(bond)) {
1863                 bond_set_carrier(bond);
1864                 eth_hw_addr_random(bond_dev);
1865         }
1866 
1867         unblock_netpoll_tx();
1868         synchronize_rcu();
1869         bond->slave_cnt--;
1870 
1871         if (!bond_has_slaves(bond)) {
1872                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1873                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1874         }
1875 
1876         bond_compute_features(bond);
1877         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1878             (old_features & NETIF_F_VLAN_CHALLENGED))
1879                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1880                             slave_dev->name, bond_dev->name);
1881 
1882         vlan_vids_del_by_dev(slave_dev, bond_dev);
1883 
1884         /* If the mode uses primary, then this case was handled above by
1885          * bond_change_active_slave(..., NULL)
1886          */
1887         if (!bond_uses_primary(bond)) {
1888                 /* unset promiscuity level from slave
1889                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1890                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1891                  * value of that flag before that change, as that was the value
1892                  * when this slave was attached, so we cache at the start of the
1893                  * function and use it here. Same goes for ALLMULTI below
1894                  */
1895                 if (old_flags & IFF_PROMISC)
1896                         dev_set_promiscuity(slave_dev, -1);
1897 
1898                 /* unset allmulti level from slave */
1899                 if (old_flags & IFF_ALLMULTI)
1900                         dev_set_allmulti(slave_dev, -1);
1901 
1902                 bond_hw_addr_flush(bond_dev, slave_dev);
1903         }
1904 
1905         slave_disable_netpoll(slave);
1906 
1907         /* close slave before restoring its mac address */
1908         dev_close(slave_dev);
1909 
1910         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1911             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1912                 /* restore original ("permanent") mac address */
1913                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1914                 addr.sa_family = slave_dev->type;
1915                 dev_set_mac_address(slave_dev, &addr);
1916         }
1917 
1918         dev_set_mtu(slave_dev, slave->original_mtu);
1919 
1920         slave_dev->priv_flags &= ~IFF_BONDING;
1921 
1922         bond_free_slave(slave);
1923 
1924         return 0;
1925 }
1926 
1927 /* A wrapper used because of ndo_del_link */
1928 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1929 {
1930         return __bond_release_one(bond_dev, slave_dev, false);
1931 }
1932 
1933 /* First release a slave and then destroy the bond if no more slaves are left.
1934  * Must be under rtnl_lock when this function is called.
1935  */
1936 static int  bond_release_and_destroy(struct net_device *bond_dev,
1937                                      struct net_device *slave_dev)
1938 {
1939         struct bonding *bond = netdev_priv(bond_dev);
1940         int ret;
1941 
1942         ret = bond_release(bond_dev, slave_dev);
1943         if (ret == 0 && !bond_has_slaves(bond)) {
1944                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1945                 netdev_info(bond_dev, "Destroying bond %s\n",
1946                             bond_dev->name);
1947                 bond_remove_proc_entry(bond);
1948                 unregister_netdevice(bond_dev);
1949         }
1950         return ret;
1951 }
1952 
1953 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1954 {
1955         struct bonding *bond = netdev_priv(bond_dev);
1956         bond_fill_ifbond(bond, info);
1957         return 0;
1958 }
1959 
1960 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1961 {
1962         struct bonding *bond = netdev_priv(bond_dev);
1963         struct list_head *iter;
1964         int i = 0, res = -ENODEV;
1965         struct slave *slave;
1966 
1967         bond_for_each_slave(bond, slave, iter) {
1968                 if (i++ == (int)info->slave_id) {
1969                         res = 0;
1970                         bond_fill_ifslave(slave, info);
1971                         break;
1972                 }
1973         }
1974 
1975         return res;
1976 }
1977 
1978 /*-------------------------------- Monitoring -------------------------------*/
1979 
1980 /* called with rcu_read_lock() */
1981 static int bond_miimon_inspect(struct bonding *bond)
1982 {
1983         int link_state, commit = 0;
1984         struct list_head *iter;
1985         struct slave *slave;
1986         bool ignore_updelay;
1987 
1988         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1989 
1990         bond_for_each_slave_rcu(bond, slave, iter) {
1991                 slave->new_link = BOND_LINK_NOCHANGE;
1992 
1993                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1994 
1995                 switch (slave->link) {
1996                 case BOND_LINK_UP:
1997                         if (link_state)
1998                                 continue;
1999 
2000                         bond_set_slave_link_state(slave, BOND_LINK_FAIL);
2001                         slave->delay = bond->params.downdelay;
2002                         if (slave->delay) {
2003                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
2004                                             (BOND_MODE(bond) ==
2005                                              BOND_MODE_ACTIVEBACKUP) ?
2006                                              (bond_is_active_slave(slave) ?
2007                                               "active " : "backup ") : "",
2008                                             slave->dev->name,
2009                                             bond->params.downdelay * bond->params.miimon);
2010                         }
2011                         /*FALLTHRU*/
2012                 case BOND_LINK_FAIL:
2013                         if (link_state) {
2014                                 /* recovered before downdelay expired */
2015                                 bond_set_slave_link_state(slave, BOND_LINK_UP);
2016                                 slave->last_link_up = jiffies;
2017                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
2018                                             (bond->params.downdelay - slave->delay) *
2019                                             bond->params.miimon,
2020                                             slave->dev->name);
2021                                 continue;
2022                         }
2023 
2024                         if (slave->delay <= 0) {
2025                                 slave->new_link = BOND_LINK_DOWN;
2026                                 commit++;
2027                                 continue;
2028                         }
2029 
2030                         slave->delay--;
2031                         break;
2032 
2033                 case BOND_LINK_DOWN:
2034                         if (!link_state)
2035                                 continue;
2036 
2037                         bond_set_slave_link_state(slave, BOND_LINK_BACK);
2038                         slave->delay = bond->params.updelay;
2039 
2040                         if (slave->delay) {
2041                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
2042                                             slave->dev->name,
2043                                             ignore_updelay ? 0 :
2044                                             bond->params.updelay *
2045                                             bond->params.miimon);
2046                         }
2047                         /*FALLTHRU*/
2048                 case BOND_LINK_BACK:
2049                         if (!link_state) {
2050                                 bond_set_slave_link_state(slave,
2051                                                           BOND_LINK_DOWN);
2052                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
2053                                             (bond->params.updelay - slave->delay) *
2054                                             bond->params.miimon,
2055                                             slave->dev->name);
2056 
2057                                 continue;
2058                         }
2059 
2060                         if (ignore_updelay)
2061                                 slave->delay = 0;
2062 
2063                         if (slave->delay <= 0) {
2064                                 slave->new_link = BOND_LINK_UP;
2065                                 commit++;
2066                                 ignore_updelay = false;
2067                                 continue;
2068                         }
2069 
2070                         slave->delay--;
2071                         break;
2072                 }
2073         }
2074 
2075         return commit;
2076 }
2077 
2078 static void bond_miimon_commit(struct bonding *bond)
2079 {
2080         struct list_head *iter;
2081         struct slave *slave, *primary;
2082 
2083         bond_for_each_slave(bond, slave, iter) {
2084                 switch (slave->new_link) {
2085                 case BOND_LINK_NOCHANGE:
2086                         continue;
2087 
2088                 case BOND_LINK_UP:
2089                         bond_set_slave_link_state(slave, BOND_LINK_UP);
2090                         slave->last_link_up = jiffies;
2091 
2092                         primary = rtnl_dereference(bond->primary_slave);
2093                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2094                                 /* prevent it from being the active one */
2095                                 bond_set_backup_slave(slave);
2096                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2097                                 /* make it immediately active */
2098                                 bond_set_active_slave(slave);
2099                         } else if (slave != primary) {
2100                                 /* prevent it from being the active one */
2101                                 bond_set_backup_slave(slave);
2102                         }
2103 
2104                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2105                                     slave->dev->name,
2106                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2107                                     slave->duplex ? "full" : "half");
2108 
2109                         /* notify ad that the link status has changed */
2110                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2111                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2112 
2113                         if (bond_is_lb(bond))
2114                                 bond_alb_handle_link_change(bond, slave,
2115                                                             BOND_LINK_UP);
2116 
2117                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2118                                 bond_update_slave_arr(bond, NULL);
2119 
2120                         if (!bond->curr_active_slave || slave == primary)
2121                                 goto do_failover;
2122 
2123                         continue;
2124 
2125                 case BOND_LINK_DOWN:
2126                         if (slave->link_failure_count < UINT_MAX)
2127                                 slave->link_failure_count++;
2128 
2129                         bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2130 
2131                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2132                             BOND_MODE(bond) == BOND_MODE_8023AD)
2133                                 bond_set_slave_inactive_flags(slave,
2134                                                               BOND_SLAVE_NOTIFY_NOW);
2135 
2136                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2137                                     slave->dev->name);
2138 
2139                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2140                                 bond_3ad_handle_link_change(slave,
2141                                                             BOND_LINK_DOWN);
2142 
2143                         if (bond_is_lb(bond))
2144                                 bond_alb_handle_link_change(bond, slave,
2145                                                             BOND_LINK_DOWN);
2146 
2147                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2148                                 bond_update_slave_arr(bond, NULL);
2149 
2150                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2151                                 goto do_failover;
2152 
2153                         continue;
2154 
2155                 default:
2156                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2157                                    slave->new_link, slave->dev->name);
2158                         slave->new_link = BOND_LINK_NOCHANGE;
2159 
2160                         continue;
2161                 }
2162 
2163 do_failover:
2164                 block_netpoll_tx();
2165                 bond_select_active_slave(bond);
2166                 unblock_netpoll_tx();
2167         }
2168 
2169         bond_set_carrier(bond);
2170 }
2171 
2172 /* bond_mii_monitor
2173  *
2174  * Really a wrapper that splits the mii monitor into two phases: an
2175  * inspection, then (if inspection indicates something needs to be done)
2176  * an acquisition of appropriate locks followed by a commit phase to
2177  * implement whatever link state changes are indicated.
2178  */
2179 static void bond_mii_monitor(struct work_struct *work)
2180 {
2181         struct bonding *bond = container_of(work, struct bonding,
2182                                             mii_work.work);
2183         bool should_notify_peers = false;
2184         unsigned long delay;
2185 
2186         delay = msecs_to_jiffies(bond->params.miimon);
2187 
2188         if (!bond_has_slaves(bond))
2189                 goto re_arm;
2190 
2191         rcu_read_lock();
2192 
2193         should_notify_peers = bond_should_notify_peers(bond);
2194 
2195         if (bond_miimon_inspect(bond)) {
2196                 rcu_read_unlock();
2197 
2198                 /* Race avoidance with bond_close cancel of workqueue */
2199                 if (!rtnl_trylock()) {
2200                         delay = 1;
2201                         should_notify_peers = false;
2202                         goto re_arm;
2203                 }
2204 
2205                 bond_miimon_commit(bond);
2206 
2207                 rtnl_unlock();  /* might sleep, hold no other locks */
2208         } else
2209                 rcu_read_unlock();
2210 
2211 re_arm:
2212         if (bond->params.miimon)
2213                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2214 
2215         if (should_notify_peers) {
2216                 if (!rtnl_trylock())
2217                         return;
2218                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2219                 rtnl_unlock();
2220         }
2221 }
2222 
2223 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2224 {
2225         struct net_device *upper;
2226         struct list_head *iter;
2227         bool ret = false;
2228 
2229         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2230                 return true;
2231 
2232         rcu_read_lock();
2233         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2234                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2235                         ret = true;
2236                         break;
2237                 }
2238         }
2239         rcu_read_unlock();
2240 
2241         return ret;
2242 }
2243 
2244 /* We go to the (large) trouble of VLAN tagging ARP frames because
2245  * switches in VLAN mode (especially if ports are configured as
2246  * "native" to a VLAN) might not pass non-tagged frames.
2247  */
2248 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2249                           __be32 dest_ip, __be32 src_ip,
2250                           struct bond_vlan_tag *tags)
2251 {
2252         struct sk_buff *skb;
2253         struct bond_vlan_tag *outer_tag = tags;
2254 
2255         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2256                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2257 
2258         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2259                          NULL, slave_dev->dev_addr, NULL);
2260 
2261         if (!skb) {
2262                 net_err_ratelimited("ARP packet allocation failed\n");
2263                 return;
2264         }
2265 
2266         if (!tags || tags->vlan_proto == VLAN_N_VID)
2267                 goto xmit;
2268 
2269         tags++;
2270 
2271         /* Go through all the tags backwards and add them to the packet */
2272         while (tags->vlan_proto != VLAN_N_VID) {
2273                 if (!tags->vlan_id) {
2274                         tags++;
2275                         continue;
2276                 }
2277 
2278                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2279                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2280                 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2281                                                 tags->vlan_id);
2282                 if (!skb) {
2283                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2284                         return;
2285                 }
2286 
2287                 tags++;
2288         }
2289         /* Set the outer tag */
2290         if (outer_tag->vlan_id) {
2291                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2292                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2293                 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2294                                        outer_tag->vlan_id);
2295         }
2296 
2297 xmit:
2298         arp_xmit(skb);
2299 }
2300 
2301 /* Validate the device path between the @start_dev and the @end_dev.
2302  * The path is valid if the @end_dev is reachable through device
2303  * stacking.
2304  * When the path is validated, collect any vlan information in the
2305  * path.
2306  */
2307 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2308                                               struct net_device *end_dev,
2309                                               int level)
2310 {
2311         struct bond_vlan_tag *tags;
2312         struct net_device *upper;
2313         struct list_head  *iter;
2314 
2315         if (start_dev == end_dev) {
2316                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2317                 if (!tags)
2318                         return ERR_PTR(-ENOMEM);
2319                 tags[level].vlan_proto = VLAN_N_VID;
2320                 return tags;
2321         }
2322 
2323         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2324                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2325                 if (IS_ERR_OR_NULL(tags)) {
2326                         if (IS_ERR(tags))
2327                                 return tags;
2328                         continue;
2329                 }
2330                 if (is_vlan_dev(upper)) {
2331                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2332                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2333                 }
2334 
2335                 return tags;
2336         }
2337 
2338         return NULL;
2339 }
2340 
2341 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2342 {
2343         struct rtable *rt;
2344         struct bond_vlan_tag *tags;
2345         __be32 *targets = bond->params.arp_targets, addr;
2346         int i;
2347 
2348         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2349                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2350                 tags = NULL;
2351 
2352                 /* Find out through which dev should the packet go */
2353                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2354                                      RTO_ONLINK, 0);
2355                 if (IS_ERR(rt)) {
2356                         /* there's no route to target - try to send arp
2357                          * probe to generate any traffic (arp_validate=0)
2358                          */
2359                         if (bond->params.arp_validate)
2360                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2361                                                      bond->dev->name,
2362                                                      &targets[i]);
2363                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2364                                       0, tags);
2365                         continue;
2366                 }
2367 
2368                 /* bond device itself */
2369                 if (rt->dst.dev == bond->dev)
2370                         goto found;
2371 
2372                 rcu_read_lock();
2373                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2374                 rcu_read_unlock();
2375 
2376                 if (!IS_ERR_OR_NULL(tags))
2377                         goto found;
2378 
2379                 /* Not our device - skip */
2380                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2381                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2382 
2383                 ip_rt_put(rt);
2384                 continue;
2385 
2386 found:
2387                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2388                 ip_rt_put(rt);
2389                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2390                               addr, tags);
2391                 kfree(tags);
2392         }
2393 }
2394 
2395 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2396 {
2397         int i;
2398 
2399         if (!sip || !bond_has_this_ip(bond, tip)) {
2400                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2401                            &sip, &tip);
2402                 return;
2403         }
2404 
2405         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2406         if (i == -1) {
2407                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2408                            &sip);
2409                 return;
2410         }
2411         slave->last_rx = jiffies;
2412         slave->target_last_arp_rx[i] = jiffies;
2413 }
2414 
2415 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2416                  struct slave *slave)
2417 {
2418         struct arphdr *arp = (struct arphdr *)skb->data;
2419         struct slave *curr_active_slave;
2420         unsigned char *arp_ptr;
2421         __be32 sip, tip;
2422         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2423 
2424         if (!slave_do_arp_validate(bond, slave)) {
2425                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2426                     !slave_do_arp_validate_only(bond))
2427                         slave->last_rx = jiffies;
2428                 return RX_HANDLER_ANOTHER;
2429         } else if (!is_arp) {
2430                 return RX_HANDLER_ANOTHER;
2431         }
2432 
2433         alen = arp_hdr_len(bond->dev);
2434 
2435         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2436                    skb->dev->name);
2437 
2438         if (alen > skb_headlen(skb)) {
2439                 arp = kmalloc(alen, GFP_ATOMIC);
2440                 if (!arp)
2441                         goto out_unlock;
2442                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2443                         goto out_unlock;
2444         }
2445 
2446         if (arp->ar_hln != bond->dev->addr_len ||
2447             skb->pkt_type == PACKET_OTHERHOST ||
2448             skb->pkt_type == PACKET_LOOPBACK ||
2449             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2450             arp->ar_pro != htons(ETH_P_IP) ||
2451             arp->ar_pln != 4)
2452                 goto out_unlock;
2453 
2454         arp_ptr = (unsigned char *)(arp + 1);
2455         arp_ptr += bond->dev->addr_len;
2456         memcpy(&sip, arp_ptr, 4);
2457         arp_ptr += 4 + bond->dev->addr_len;
2458         memcpy(&tip, arp_ptr, 4);
2459 
2460         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2461                    slave->dev->name, bond_slave_state(slave),
2462                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2463                      &sip, &tip);
2464 
2465         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2466 
2467         /* Backup slaves won't see the ARP reply, but do come through
2468          * here for each ARP probe (so we swap the sip/tip to validate
2469          * the probe).  In a "redundant switch, common router" type of
2470          * configuration, the ARP probe will (hopefully) travel from
2471          * the active, through one switch, the router, then the other
2472          * switch before reaching the backup.
2473          *
2474          * We 'trust' the arp requests if there is an active slave and
2475          * it received valid arp reply(s) after it became active. This
2476          * is done to avoid endless looping when we can't reach the
2477          * arp_ip_target and fool ourselves with our own arp requests.
2478          */
2479 
2480         if (bond_is_active_slave(slave))
2481                 bond_validate_arp(bond, slave, sip, tip);
2482         else if (curr_active_slave &&
2483                  time_after(slave_last_rx(bond, curr_active_slave),
2484                             curr_active_slave->last_link_up))
2485                 bond_validate_arp(bond, slave, tip, sip);
2486 
2487 out_unlock:
2488         if (arp != (struct arphdr *)skb->data)
2489                 kfree(arp);
2490         return RX_HANDLER_ANOTHER;
2491 }
2492 
2493 /* function to verify if we're in the arp_interval timeslice, returns true if
2494  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2495  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2496  */
2497 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2498                                   int mod)
2499 {
2500         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2501 
2502         return time_in_range(jiffies,
2503                              last_act - delta_in_ticks,
2504                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2505 }
2506 
2507 /* This function is called regularly to monitor each slave's link
2508  * ensuring that traffic is being sent and received when arp monitoring
2509  * is used in load-balancing mode. if the adapter has been dormant, then an
2510  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2511  * arp monitoring in active backup mode.
2512  */
2513 static void bond_loadbalance_arp_mon(struct work_struct *work)
2514 {
2515         struct bonding *bond = container_of(work, struct bonding,
2516                                             arp_work.work);
2517         struct slave *slave, *oldcurrent;
2518         struct list_head *iter;
2519         int do_failover = 0, slave_state_changed = 0;
2520 
2521         if (!bond_has_slaves(bond))
2522                 goto re_arm;
2523 
2524         rcu_read_lock();
2525 
2526         oldcurrent = rcu_dereference(bond->curr_active_slave);
2527         /* see if any of the previous devices are up now (i.e. they have
2528          * xmt and rcv traffic). the curr_active_slave does not come into
2529          * the picture unless it is null. also, slave->last_link_up is not
2530          * needed here because we send an arp on each slave and give a slave
2531          * as long as it needs to get the tx/rx within the delta.
2532          * TODO: what about up/down delay in arp mode? it wasn't here before
2533          *       so it can wait
2534          */
2535         bond_for_each_slave_rcu(bond, slave, iter) {
2536                 unsigned long trans_start = dev_trans_start(slave->dev);
2537 
2538                 if (slave->link != BOND_LINK_UP) {
2539                         if (bond_time_in_interval(bond, trans_start, 1) &&
2540                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2541 
2542                                 slave->link  = BOND_LINK_UP;
2543                                 slave_state_changed = 1;
2544 
2545                                 /* primary_slave has no meaning in round-robin
2546                                  * mode. the window of a slave being up and
2547                                  * curr_active_slave being null after enslaving
2548                                  * is closed.
2549                                  */
2550                                 if (!oldcurrent) {
2551                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2552                                                     slave->dev->name);
2553                                         do_failover = 1;
2554                                 } else {
2555                                         netdev_info(bond->dev, "interface %s is now up\n",
2556                                                     slave->dev->name);
2557                                 }
2558                         }
2559                 } else {
2560                         /* slave->link == BOND_LINK_UP */
2561 
2562                         /* not all switches will respond to an arp request
2563                          * when the source ip is 0, so don't take the link down
2564                          * if we don't know our ip yet
2565                          */
2566                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2567                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2568 
2569                                 slave->link  = BOND_LINK_DOWN;
2570                                 slave_state_changed = 1;
2571 
2572                                 if (slave->link_failure_count < UINT_MAX)
2573                                         slave->link_failure_count++;
2574 
2575                                 netdev_info(bond->dev, "interface %s is now down\n",
2576                                             slave->dev->name);
2577 
2578                                 if (slave == oldcurrent)
2579                                         do_failover = 1;
2580                         }
2581                 }
2582 
2583                 /* note: if switch is in round-robin mode, all links
2584                  * must tx arp to ensure all links rx an arp - otherwise
2585                  * links may oscillate or not come up at all; if switch is
2586                  * in something like xor mode, there is nothing we can
2587                  * do - all replies will be rx'ed on same link causing slaves
2588                  * to be unstable during low/no traffic periods
2589                  */
2590                 if (bond_slave_is_up(slave))
2591                         bond_arp_send_all(bond, slave);
2592         }
2593 
2594         rcu_read_unlock();
2595 
2596         if (do_failover || slave_state_changed) {
2597                 if (!rtnl_trylock())
2598                         goto re_arm;
2599 
2600                 if (slave_state_changed) {
2601                         bond_slave_state_change(bond);
2602                         if (BOND_MODE(bond) == BOND_MODE_XOR)
2603                                 bond_update_slave_arr(bond, NULL);
2604                 }
2605                 if (do_failover) {
2606                         block_netpoll_tx();
2607                         bond_select_active_slave(bond);
2608                         unblock_netpoll_tx();
2609                 }
2610                 rtnl_unlock();
2611         }
2612 
2613 re_arm:
2614         if (bond->params.arp_interval)
2615                 queue_delayed_work(bond->wq, &bond->arp_work,
2616                                    msecs_to_jiffies(bond->params.arp_interval));
2617 }
2618 
2619 /* Called to inspect slaves for active-backup mode ARP monitor link state
2620  * changes.  Sets new_link in slaves to specify what action should take
2621  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2622  * to link states must be committed.
2623  *
2624  * Called with rcu_read_lock held.
2625  */
2626 static int bond_ab_arp_inspect(struct bonding *bond)
2627 {
2628         unsigned long trans_start, last_rx;
2629         struct list_head *iter;
2630         struct slave *slave;
2631         int commit = 0;
2632 
2633         bond_for_each_slave_rcu(bond, slave, iter) {
2634                 slave->new_link = BOND_LINK_NOCHANGE;
2635                 last_rx = slave_last_rx(bond, slave);
2636 
2637                 if (slave->link != BOND_LINK_UP) {
2638                         if (bond_time_in_interval(bond, last_rx, 1)) {
2639                                 slave->new_link = BOND_LINK_UP;
2640                                 commit++;
2641                         }
2642                         continue;
2643                 }
2644 
2645                 /* Give slaves 2*delta after being enslaved or made
2646                  * active.  This avoids bouncing, as the last receive
2647                  * times need a full ARP monitor cycle to be updated.
2648                  */
2649                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2650                         continue;
2651 
2652                 /* Backup slave is down if:
2653                  * - No current_arp_slave AND
2654                  * - more than 3*delta since last receive AND
2655                  * - the bond has an IP address
2656                  *
2657                  * Note: a non-null current_arp_slave indicates
2658                  * the curr_active_slave went down and we are
2659                  * searching for a new one; under this condition
2660                  * we only take the curr_active_slave down - this
2661                  * gives each slave a chance to tx/rx traffic
2662                  * before being taken out
2663                  */
2664                 if (!bond_is_active_slave(slave) &&
2665                     !rcu_access_pointer(bond->current_arp_slave) &&
2666                     !bond_time_in_interval(bond, last_rx, 3)) {
2667                         slave->new_link = BOND_LINK_DOWN;
2668                         commit++;
2669                 }
2670 
2671                 /* Active slave is down if:
2672                  * - more than 2*delta since transmitting OR
2673                  * - (more than 2*delta since receive AND
2674                  *    the bond has an IP address)
2675                  */
2676                 trans_start = dev_trans_start(slave->dev);
2677                 if (bond_is_active_slave(slave) &&
2678                     (!bond_time_in_interval(bond, trans_start, 2) ||
2679                      !bond_time_in_interval(bond, last_rx, 2))) {
2680                         slave->new_link = BOND_LINK_DOWN;
2681                         commit++;
2682                 }
2683         }
2684 
2685         return commit;
2686 }
2687 
2688 /* Called to commit link state changes noted by inspection step of
2689  * active-backup mode ARP monitor.
2690  *
2691  * Called with RTNL hold.
2692  */
2693 static void bond_ab_arp_commit(struct bonding *bond)
2694 {
2695         unsigned long trans_start;
2696         struct list_head *iter;
2697         struct slave *slave;
2698 
2699         bond_for_each_slave(bond, slave, iter) {
2700                 switch (slave->new_link) {
2701                 case BOND_LINK_NOCHANGE:
2702                         continue;
2703 
2704                 case BOND_LINK_UP:
2705                         trans_start = dev_trans_start(slave->dev);
2706                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2707                             (!rtnl_dereference(bond->curr_active_slave) &&
2708                              bond_time_in_interval(bond, trans_start, 1))) {
2709                                 struct slave *current_arp_slave;
2710 
2711                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2712                                 bond_set_slave_link_state(slave, BOND_LINK_UP);
2713                                 if (current_arp_slave) {
2714                                         bond_set_slave_inactive_flags(
2715                                                 current_arp_slave,
2716                                                 BOND_SLAVE_NOTIFY_NOW);
2717                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2718                                 }
2719 
2720                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2721                                             slave->dev->name);
2722 
2723                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2724                                     slave == rtnl_dereference(bond->primary_slave))
2725                                         goto do_failover;
2726 
2727                         }
2728 
2729                         continue;
2730 
2731                 case BOND_LINK_DOWN:
2732                         if (slave->link_failure_count < UINT_MAX)
2733                                 slave->link_failure_count++;
2734 
2735                         bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2736                         bond_set_slave_inactive_flags(slave,
2737                                                       BOND_SLAVE_NOTIFY_NOW);
2738 
2739                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2740                                     slave->dev->name);
2741 
2742                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2743                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2744                                 goto do_failover;
2745                         }
2746 
2747                         continue;
2748 
2749                 default:
2750                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2751                                    slave->new_link, slave->dev->name);
2752                         continue;
2753                 }
2754 
2755 do_failover:
2756                 block_netpoll_tx();
2757                 bond_select_active_slave(bond);
2758                 unblock_netpoll_tx();
2759         }
2760 
2761         bond_set_carrier(bond);
2762 }
2763 
2764 /* Send ARP probes for active-backup mode ARP monitor.
2765  *
2766  * Called with rcu_read_lock held.
2767  */
2768 static bool bond_ab_arp_probe(struct bonding *bond)
2769 {
2770         struct slave *slave, *before = NULL, *new_slave = NULL,
2771                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2772                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2773         struct list_head *iter;
2774         bool found = false;
2775         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2776 
2777         if (curr_arp_slave && curr_active_slave)
2778                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2779                             curr_arp_slave->dev->name,
2780                             curr_active_slave->dev->name);
2781 
2782         if (curr_active_slave) {
2783                 bond_arp_send_all(bond, curr_active_slave);
2784                 return should_notify_rtnl;
2785         }
2786 
2787         /* if we don't have a curr_active_slave, search for the next available
2788          * backup slave from the current_arp_slave and make it the candidate
2789          * for becoming the curr_active_slave
2790          */
2791 
2792         if (!curr_arp_slave) {
2793                 curr_arp_slave = bond_first_slave_rcu(bond);
2794                 if (!curr_arp_slave)
2795                         return should_notify_rtnl;
2796         }
2797 
2798         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2799 
2800         bond_for_each_slave_rcu(bond, slave, iter) {
2801                 if (!found && !before && bond_slave_is_up(slave))
2802                         before = slave;
2803 
2804                 if (found && !new_slave && bond_slave_is_up(slave))
2805                         new_slave = slave;
2806                 /* if the link state is up at this point, we
2807                  * mark it down - this can happen if we have
2808                  * simultaneous link failures and
2809                  * reselect_active_interface doesn't make this
2810                  * one the current slave so it is still marked
2811                  * up when it is actually down
2812                  */
2813                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2814                         bond_set_slave_link_state(slave, BOND_LINK_DOWN);
2815                         if (slave->link_failure_count < UINT_MAX)
2816                                 slave->link_failure_count++;
2817 
2818                         bond_set_slave_inactive_flags(slave,
2819                                                       BOND_SLAVE_NOTIFY_LATER);
2820 
2821                         netdev_info(bond->dev, "backup interface %s is now down\n",
2822                                     slave->dev->name);
2823                 }
2824                 if (slave == curr_arp_slave)
2825                         found = true;
2826         }
2827 
2828         if (!new_slave && before)
2829                 new_slave = before;
2830 
2831         if (!new_slave)
2832                 goto check_state;
2833 
2834         bond_set_slave_link_state(new_slave, BOND_LINK_BACK);
2835         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2836         bond_arp_send_all(bond, new_slave);
2837         new_slave->last_link_up = jiffies;
2838         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2839 
2840 check_state:
2841         bond_for_each_slave_rcu(bond, slave, iter) {
2842                 if (slave->should_notify) {
2843                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2844                         break;
2845                 }
2846         }
2847         return should_notify_rtnl;
2848 }
2849 
2850 static void bond_activebackup_arp_mon(struct work_struct *work)
2851 {
2852         struct bonding *bond = container_of(work, struct bonding,
2853                                             arp_work.work);
2854         bool should_notify_peers = false;
2855         bool should_notify_rtnl = false;
2856         int delta_in_ticks;
2857 
2858         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2859 
2860         if (!bond_has_slaves(bond))
2861                 goto re_arm;
2862 
2863         rcu_read_lock();
2864 
2865         should_notify_peers = bond_should_notify_peers(bond);
2866 
2867         if (bond_ab_arp_inspect(bond)) {
2868                 rcu_read_unlock();
2869 
2870                 /* Race avoidance with bond_close flush of workqueue */
2871                 if (!rtnl_trylock()) {
2872                         delta_in_ticks = 1;
2873                         should_notify_peers = false;
2874                         goto re_arm;
2875                 }
2876 
2877                 bond_ab_arp_commit(bond);
2878 
2879                 rtnl_unlock();
2880                 rcu_read_lock();
2881         }
2882 
2883         should_notify_rtnl = bond_ab_arp_probe(bond);
2884         rcu_read_unlock();
2885 
2886 re_arm:
2887         if (bond->params.arp_interval)
2888                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2889 
2890         if (should_notify_peers || should_notify_rtnl) {
2891                 if (!rtnl_trylock())
2892                         return;
2893 
2894                 if (should_notify_peers)
2895                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2896                                                  bond->dev);
2897                 if (should_notify_rtnl)
2898                         bond_slave_state_notify(bond);
2899 
2900                 rtnl_unlock();
2901         }
2902 }
2903 
2904 /*-------------------------- netdev event handling --------------------------*/
2905 
2906 /* Change device name */
2907 static int bond_event_changename(struct bonding *bond)
2908 {
2909         bond_remove_proc_entry(bond);
2910         bond_create_proc_entry(bond);
2911 
2912         bond_debug_reregister(bond);
2913 
2914         return NOTIFY_DONE;
2915 }
2916 
2917 static int bond_master_netdev_event(unsigned long event,
2918                                     struct net_device *bond_dev)
2919 {
2920         struct bonding *event_bond = netdev_priv(bond_dev);
2921 
2922         switch (event) {
2923         case NETDEV_CHANGENAME:
2924                 return bond_event_changename(event_bond);
2925         case NETDEV_UNREGISTER:
2926                 bond_remove_proc_entry(event_bond);
2927                 break;
2928         case NETDEV_REGISTER:
2929                 bond_create_proc_entry(event_bond);
2930                 break;
2931         case NETDEV_NOTIFY_PEERS:
2932                 if (event_bond->send_peer_notif)
2933                         event_bond->send_peer_notif--;
2934                 break;
2935         default:
2936                 break;
2937         }
2938 
2939         return NOTIFY_DONE;
2940 }
2941 
2942 static int bond_slave_netdev_event(unsigned long event,
2943                                    struct net_device *slave_dev)
2944 {
2945         struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
2946         struct bonding *bond;
2947         struct net_device *bond_dev;
2948         u32 old_speed;
2949         u8 old_duplex;
2950 
2951         /* A netdev event can be generated while enslaving a device
2952          * before netdev_rx_handler_register is called in which case
2953          * slave will be NULL
2954          */
2955         if (!slave)
2956                 return NOTIFY_DONE;
2957         bond_dev = slave->bond->dev;
2958         bond = slave->bond;
2959         primary = rtnl_dereference(bond->primary_slave);
2960 
2961         switch (event) {
2962         case NETDEV_UNREGISTER:
2963                 if (bond_dev->type != ARPHRD_ETHER)
2964                         bond_release_and_destroy(bond_dev, slave_dev);
2965                 else
2966                         bond_release(bond_dev, slave_dev);
2967                 break;
2968         case NETDEV_UP:
2969         case NETDEV_CHANGE:
2970                 old_speed = slave->speed;
2971                 old_duplex = slave->duplex;
2972 
2973                 bond_update_speed_duplex(slave);
2974 
2975                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2976                         if (old_speed != slave->speed)
2977                                 bond_3ad_adapter_speed_changed(slave);
2978                         if (old_duplex != slave->duplex)
2979                                 bond_3ad_adapter_duplex_changed(slave);
2980                 }
2981                 /* Fallthrough */
2982         case NETDEV_DOWN:
2983                 /* Refresh slave-array if applicable!
2984                  * If the setup does not use miimon or arpmon (mode-specific!),
2985                  * then these events will not cause the slave-array to be
2986                  * refreshed. This will cause xmit to use a slave that is not
2987                  * usable. Avoid such situation by refeshing the array at these
2988                  * events. If these (miimon/arpmon) parameters are configured
2989                  * then array gets refreshed twice and that should be fine!
2990                  */
2991                 if (bond_mode_uses_xmit_hash(bond))
2992                         bond_update_slave_arr(bond, NULL);
2993                 break;
2994         case NETDEV_CHANGEMTU:
2995                 /* TODO: Should slaves be allowed to
2996                  * independently alter their MTU?  For
2997                  * an active-backup bond, slaves need
2998                  * not be the same type of device, so
2999                  * MTUs may vary.  For other modes,
3000                  * slaves arguably should have the
3001                  * same MTUs. To do this, we'd need to
3002                  * take over the slave's change_mtu
3003                  * function for the duration of their
3004                  * servitude.
3005                  */
3006                 break;
3007         case NETDEV_CHANGENAME:
3008                 /* we don't care if we don't have primary set */
3009                 if (!bond_uses_primary(bond) ||
3010                     !bond->params.primary[0])
3011                         break;
3012 
3013                 if (slave == primary) {
3014                         /* slave's name changed - he's no longer primary */
3015                         RCU_INIT_POINTER(bond->primary_slave, NULL);
3016                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3017                         /* we have a new primary slave */
3018                         rcu_assign_pointer(bond->primary_slave, slave);
3019                 } else { /* we didn't change primary - exit */
3020                         break;
3021                 }
3022 
3023                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3024                             primary ? slave_dev->name : "none");
3025 
3026                 block_netpoll_tx();
3027                 bond_select_active_slave(bond);
3028                 unblock_netpoll_tx();
3029                 break;
3030         case NETDEV_FEAT_CHANGE:
3031                 bond_compute_features(bond);
3032                 break;
3033         case NETDEV_RESEND_IGMP:
3034                 /* Propagate to master device */
3035                 call_netdevice_notifiers(event, slave->bond->dev);
3036                 break;
3037         default:
3038                 break;
3039         }
3040 
3041         return NOTIFY_DONE;
3042 }
3043 
3044 /* bond_netdev_event: handle netdev notifier chain events.
3045  *
3046  * This function receives events for the netdev chain.  The caller (an
3047  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3048  * locks for us to safely manipulate the slave devices (RTNL lock,
3049  * dev_probe_lock).
3050  */
3051 static int bond_netdev_event(struct notifier_block *this,
3052                              unsigned long event, void *ptr)
3053 {
3054         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3055 
3056         netdev_dbg(event_dev, "event: %lx\n", event);
3057 
3058         if (!(event_dev->priv_flags & IFF_BONDING))
3059                 return NOTIFY_DONE;
3060 
3061         if (event_dev->flags & IFF_MASTER) {
3062                 netdev_dbg(event_dev, "IFF_MASTER\n");
3063                 return bond_master_netdev_event(event, event_dev);
3064         }
3065 
3066         if (event_dev->flags & IFF_SLAVE) {
3067                 netdev_dbg(event_dev, "IFF_SLAVE\n");
3068                 return bond_slave_netdev_event(event, event_dev);
3069         }
3070 
3071         return NOTIFY_DONE;
3072 }
3073 
3074 static struct notifier_block bond_netdev_notifier = {
3075         .notifier_call = bond_netdev_event,
3076 };
3077 
3078 /*---------------------------- Hashing Policies -----------------------------*/
3079 
3080 /* L2 hash helper */
3081 static inline u32 bond_eth_hash(struct sk_buff *skb)
3082 {
3083         struct ethhdr *ep, hdr_tmp;
3084 
3085         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3086         if (ep)
3087                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3088         return 0;
3089 }
3090 
3091 /* Extract the appropriate headers based on bond's xmit policy */
3092 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3093                               struct flow_keys *fk)
3094 {
3095         const struct ipv6hdr *iph6;
3096         const struct iphdr *iph;
3097         int noff, proto = -1;
3098 
3099         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3100                 return skb_flow_dissect_flow_keys(skb, fk);
3101 
3102         fk->ports.ports = 0;
3103         noff = skb_network_offset(skb);
3104         if (skb->protocol == htons(ETH_P_IP)) {
3105                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3106                         return false;
3107                 iph = ip_hdr(skb);
3108                 iph_to_flow_copy_v4addrs(fk, iph);
3109                 noff += iph->ihl << 2;
3110                 if (!ip_is_fragment(iph))
3111                         proto = iph->protocol;
3112         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3113                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3114                         return false;
3115                 iph6 = ipv6_hdr(skb);
3116                 iph_to_flow_copy_v6addrs(fk, iph6);
3117                 noff += sizeof(*iph6);
3118                 proto = iph6->nexthdr;
3119         } else {
3120                 return false;
3121         }
3122         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3123                 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3124 
3125         return true;
3126 }
3127 
3128 /**
3129  * bond_xmit_hash - generate a hash value based on the xmit policy
3130  * @bond: bonding device
3131  * @skb: buffer to use for headers
3132  *
3133  * This function will extract the necessary headers from the skb buffer and use
3134  * them to generate a hash based on the xmit_policy set in the bonding device
3135  */
3136 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3137 {
3138         struct flow_keys flow;
3139         u32 hash;
3140 
3141         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3142             !bond_flow_dissect(bond, skb, &flow))
3143                 return bond_eth_hash(skb);
3144 
3145         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3146             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3147                 hash = bond_eth_hash(skb);
3148         else
3149                 hash = (__force u32)flow.ports.ports;
3150         hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3151                 (__force u32)flow_get_u32_src(&flow);
3152         hash ^= (hash >> 16);
3153         hash ^= (hash >> 8);
3154 
3155         return hash;
3156 }
3157 
3158 /*-------------------------- Device entry points ----------------------------*/
3159 
3160 static void bond_work_init_all(struct bonding *bond)
3161 {
3162         INIT_DELAYED_WORK(&bond->mcast_work,
3163                           bond_resend_igmp_join_requests_delayed);
3164         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3165         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3166         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3167                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3168         else
3169                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3170         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3171         INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3172 }
3173 
3174 static void bond_work_cancel_all(struct bonding *bond)
3175 {
3176         cancel_delayed_work_sync(&bond->mii_work);
3177         cancel_delayed_work_sync(&bond->arp_work);
3178         cancel_delayed_work_sync(&bond->alb_work);
3179         cancel_delayed_work_sync(&bond->ad_work);
3180         cancel_delayed_work_sync(&bond->mcast_work);
3181         cancel_delayed_work_sync(&bond->slave_arr_work);
3182 }
3183 
3184 static int bond_open(struct net_device *bond_dev)
3185 {
3186         struct bonding *bond = netdev_priv(bond_dev);
3187         struct list_head *iter;
3188         struct slave *slave;
3189 
3190         /* reset slave->backup and slave->inactive */
3191         if (bond_has_slaves(bond)) {
3192                 bond_for_each_slave(bond, slave, iter) {
3193                         if (bond_uses_primary(bond) &&
3194                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3195                                 bond_set_slave_inactive_flags(slave,
3196                                                               BOND_SLAVE_NOTIFY_NOW);
3197                         } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3198                                 bond_set_slave_active_flags(slave,
3199                                                             BOND_SLAVE_NOTIFY_NOW);
3200                         }
3201                 }
3202         }
3203 
3204         bond_work_init_all(bond);
3205 
3206         if (bond_is_lb(bond)) {
3207                 /* bond_alb_initialize must be called before the timer
3208                  * is started.
3209                  */
3210                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3211                         return -ENOMEM;
3212                 if (bond->params.tlb_dynamic_lb)
3213                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3214         }
3215 
3216         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3217                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3218 
3219         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3220                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3221                 bond->recv_probe = bond_arp_rcv;
3222         }
3223 
3224         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3225                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3226                 /* register to receive LACPDUs */
3227                 bond->recv_probe = bond_3ad_lacpdu_recv;
3228                 bond_3ad_initiate_agg_selection(bond, 1);
3229         }
3230 
3231         if (bond_mode_uses_xmit_hash(bond))
3232                 bond_update_slave_arr(bond, NULL);
3233 
3234         return 0;
3235 }
3236 
3237 static int bond_close(struct net_device *bond_dev)
3238 {
3239         struct bonding *bond = netdev_priv(bond_dev);
3240 
3241         bond_work_cancel_all(bond);
3242         bond->send_peer_notif = 0;
3243         if (bond_is_lb(bond))
3244                 bond_alb_deinitialize(bond);
3245         bond->recv_probe = NULL;
3246 
3247         return 0;
3248 }
3249 
3250 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3251                                                 struct rtnl_link_stats64 *stats)
3252 {
3253         struct bonding *bond = netdev_priv(bond_dev);
3254         struct rtnl_link_stats64 temp;
3255         struct list_head *iter;
3256         struct slave *slave;
3257 
3258         memcpy(stats, &bond->bond_stats, sizeof(*stats));
3259 
3260         bond_for_each_slave(bond, slave, iter) {
3261                 const struct rtnl_link_stats64 *sstats =
3262                         dev_get_stats(slave->dev, &temp);
3263                 struct rtnl_link_stats64 *pstats = &slave->slave_stats;
3264 
3265                 stats->rx_packets +=  sstats->rx_packets - pstats->rx_packets;
3266                 stats->rx_bytes += sstats->rx_bytes - pstats->rx_bytes;
3267                 stats->rx_errors += sstats->rx_errors - pstats->rx_errors;
3268                 stats->rx_dropped += sstats->rx_dropped - pstats->rx_dropped;
3269 
3270                 stats->tx_packets += sstats->tx_packets - pstats->tx_packets;;
3271                 stats->tx_bytes += sstats->tx_bytes - pstats->tx_bytes;
3272                 stats->tx_errors += sstats->tx_errors - pstats->tx_errors;
3273                 stats->tx_dropped += sstats->tx_dropped - pstats->tx_dropped;
3274 
3275                 stats->multicast += sstats->multicast - pstats->multicast;
3276                 stats->collisions += sstats->collisions - pstats->collisions;
3277 
3278                 stats->rx_length_errors += sstats->rx_length_errors - pstats->rx_length_errors;
3279                 stats->rx_over_errors += sstats->rx_over_errors - pstats->rx_over_errors;
3280                 stats->rx_crc_errors += sstats->rx_crc_errors - pstats->rx_crc_errors;
3281                 stats->rx_frame_errors += sstats->rx_frame_errors - pstats->rx_frame_errors;
3282                 stats->rx_fifo_errors += sstats->rx_fifo_errors - pstats->rx_fifo_errors;
3283                 stats->rx_missed_errors += sstats->rx_missed_errors - pstats->rx_missed_errors;
3284 
3285                 stats->tx_aborted_errors += sstats->tx_aborted_errors - pstats->tx_aborted_errors;
3286                 stats->tx_carrier_errors += sstats->tx_carrier_errors - pstats->tx_carrier_errors;
3287                 stats->tx_fifo_errors += sstats->tx_fifo_errors - pstats->tx_fifo_errors;
3288                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors - pstats->tx_heartbeat_errors;
3289                 stats->tx_window_errors += sstats->tx_window_errors - pstats->tx_window_errors;
3290 
3291                 /* save off the slave stats for the next run */
3292                 memcpy(pstats, sstats, sizeof(*sstats));
3293         }
3294         memcpy(&bond->bond_stats, stats, sizeof(*stats));
3295 
3296         return stats;
3297 }
3298 
3299 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3300 {
3301         struct bonding *bond = netdev_priv(bond_dev);
3302         struct net_device *slave_dev = NULL;
3303         struct ifbond k_binfo;
3304         struct ifbond __user *u_binfo = NULL;
3305         struct ifslave k_sinfo;
3306         struct ifslave __user *u_sinfo = NULL;
3307         struct mii_ioctl_data *mii = NULL;
3308         struct bond_opt_value newval;
3309         struct net *net;
3310         int res = 0;
3311 
3312         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3313 
3314         switch (cmd) {
3315         case SIOCGMIIPHY:
3316                 mii = if_mii(ifr);
3317                 if (!mii)
3318                         return -EINVAL;
3319 
3320                 mii->phy_id = 0;
3321                 /* Fall Through */
3322         case SIOCGMIIREG:
3323                 /* We do this again just in case we were called by SIOCGMIIREG
3324                  * instead of SIOCGMIIPHY.
3325                  */
3326                 mii = if_mii(ifr);
3327                 if (!mii)
3328                         return -EINVAL;
3329 
3330                 if (mii->reg_num == 1) {
3331                         mii->val_out = 0;
3332                         if (netif_carrier_ok(bond->dev))
3333                                 mii->val_out = BMSR_LSTATUS;
3334                 }
3335 
3336                 return 0;
3337         case BOND_INFO_QUERY_OLD:
3338         case SIOCBONDINFOQUERY:
3339                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3340 
3341                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3342                         return -EFAULT;
3343 
3344                 res = bond_info_query(bond_dev, &k_binfo);
3345                 if (res == 0 &&
3346                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3347                         return -EFAULT;
3348 
3349                 return res;
3350         case BOND_SLAVE_INFO_QUERY_OLD:
3351         case SIOCBONDSLAVEINFOQUERY:
3352                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3353 
3354                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3355                         return -EFAULT;
3356 
3357                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3358                 if (res == 0 &&
3359                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3360                         return -EFAULT;
3361 
3362                 return res;
3363         default:
3364                 break;
3365         }
3366 
3367         net = dev_net(bond_dev);
3368 
3369         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3370                 return -EPERM;
3371 
3372         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3373 
3374         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3375 
3376         if (!slave_dev)
3377                 return -ENODEV;
3378 
3379         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3380         switch (cmd) {
3381         case BOND_ENSLAVE_OLD:
3382         case SIOCBONDENSLAVE:
3383                 res = bond_enslave(bond_dev, slave_dev);
3384                 break;
3385         case BOND_RELEASE_OLD:
3386         case SIOCBONDRELEASE:
3387                 res = bond_release(bond_dev, slave_dev);
3388                 break;
3389         case BOND_SETHWADDR_OLD:
3390         case SIOCBONDSETHWADDR:
3391                 bond_set_dev_addr(bond_dev, slave_dev);
3392                 res = 0;
3393                 break;
3394         case BOND_CHANGE_ACTIVE_OLD:
3395         case SIOCBONDCHANGEACTIVE:
3396                 bond_opt_initstr(&newval, slave_dev->name);
3397                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3398                 break;
3399         default:
3400                 res = -EOPNOTSUPP;
3401         }
3402 
3403         return res;
3404 }
3405 
3406 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3407 {
3408         struct bonding *bond = netdev_priv(bond_dev);
3409 
3410         if (change & IFF_PROMISC)
3411                 bond_set_promiscuity(bond,
3412                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3413 
3414         if (change & IFF_ALLMULTI)
3415                 bond_set_allmulti(bond,
3416                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3417 }
3418 
3419 static void bond_set_rx_mode(struct net_device *bond_dev)
3420 {
3421         struct bonding *bond = netdev_priv(bond_dev);
3422         struct list_head *iter;
3423         struct slave *slave;
3424 
3425         rcu_read_lock();
3426         if (bond_uses_primary(bond)) {
3427                 slave = rcu_dereference(bond->curr_active_slave);
3428                 if (slave) {
3429                         dev_uc_sync(slave->dev, bond_dev);
3430                         dev_mc_sync(slave->dev, bond_dev);
3431                 }
3432         } else {
3433                 bond_for_each_slave_rcu(bond, slave, iter) {
3434                         dev_uc_sync_multiple(slave->dev, bond_dev);
3435                         dev_mc_sync_multiple(slave->dev, bond_dev);
3436                 }
3437         }
3438         rcu_read_unlock();
3439 }
3440 
3441 static int bond_neigh_init(struct neighbour *n)
3442 {
3443         struct bonding *bond = netdev_priv(n->dev);
3444         const struct net_device_ops *slave_ops;
3445         struct neigh_parms parms;
3446         struct slave *slave;
3447         int ret;
3448 
3449         slave = bond_first_slave(bond);
3450         if (!slave)
3451                 return 0;
3452         slave_ops = slave->dev->netdev_ops;
3453         if (!slave_ops->ndo_neigh_setup)
3454                 return 0;
3455 
3456         parms.neigh_setup = NULL;
3457         parms.neigh_cleanup = NULL;
3458         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3459         if (ret)
3460                 return ret;
3461 
3462         /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3463          * after the last slave has been detached.  Assumes that all slaves
3464          * utilize the same neigh_cleanup (true at this writing as only user
3465          * is ipoib).
3466          */
3467         n->parms->neigh_cleanup = parms.neigh_cleanup;
3468 
3469         if (!parms.neigh_setup)
3470                 return 0;
3471 
3472         return parms.neigh_setup(n);
3473 }
3474 
3475 /* The bonding ndo_neigh_setup is called at init time beofre any
3476  * slave exists. So we must declare proxy setup function which will
3477  * be used at run time to resolve the actual slave neigh param setup.
3478  *
3479  * It's also called by master devices (such as vlans) to setup their
3480  * underlying devices. In that case - do nothing, we're already set up from
3481  * our init.
3482  */
3483 static int bond_neigh_setup(struct net_device *dev,
3484                             struct neigh_parms *parms)
3485 {
3486         /* modify only our neigh_parms */
3487         if (parms->dev == dev)
3488                 parms->neigh_setup = bond_neigh_init;
3489 
3490         return 0;
3491 }
3492 
3493 /* Change the MTU of all of a master's slaves to match the master */
3494 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3495 {
3496         struct bonding *bond = netdev_priv(bond_dev);
3497         struct slave *slave, *rollback_slave;
3498         struct list_head *iter;
3499         int res = 0;
3500 
3501         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3502 
3503         bond_for_each_slave(bond, slave, iter) {
3504                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3505                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3506 
3507                 res = dev_set_mtu(slave->dev, new_mtu);
3508 
3509                 if (res) {
3510                         /* If we failed to set the slave's mtu to the new value
3511                          * we must abort the operation even in ACTIVE_BACKUP
3512                          * mode, because if we allow the backup slaves to have
3513                          * different mtu values than the active slave we'll
3514                          * need to change their mtu when doing a failover. That
3515                          * means changing their mtu from timer context, which
3516                          * is probably not a good idea.
3517                          */
3518                         netdev_dbg(bond_dev, "err %d %s\n", res,
3519                                    slave->dev->name);
3520                         goto unwind;
3521                 }
3522         }
3523 
3524         bond_dev->mtu = new_mtu;
3525 
3526         return 0;
3527 
3528 unwind:
3529         /* unwind from head to the slave that failed */
3530         bond_for_each_slave(bond, rollback_slave, iter) {
3531                 int tmp_res;
3532 
3533                 if (rollback_slave == slave)
3534                         break;
3535 
3536                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3537                 if (tmp_res) {
3538                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3539                                    tmp_res, rollback_slave->dev->name);
3540                 }
3541         }
3542 
3543         return res;
3544 }
3545 
3546 /* Change HW address
3547  *
3548  * Note that many devices must be down to change the HW address, and
3549  * downing the master releases all slaves.  We can make bonds full of
3550  * bonding devices to test this, however.
3551  */
3552 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3553 {
3554         struct bonding *bond = netdev_priv(bond_dev);
3555         struct slave *slave, *rollback_slave;
3556         struct sockaddr *sa = addr, tmp_sa;
3557         struct list_head *iter;
3558         int res = 0;
3559 
3560         if (BOND_MODE(bond) == BOND_MODE_ALB)
3561                 return bond_alb_set_mac_address(bond_dev, addr);
3562 
3563 
3564         netdev_dbg(bond_dev, "bond=%p\n", bond);
3565 
3566         /* If fail_over_mac is enabled, do nothing and return success.
3567          * Returning an error causes ifenslave to fail.
3568          */
3569         if (bond->params.fail_over_mac &&
3570             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3571                 return 0;
3572 
3573         if (!is_valid_ether_addr(sa->sa_data))
3574                 return -EADDRNOTAVAIL;
3575 
3576         bond_for_each_slave(bond, slave, iter) {
3577                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3578                 res = dev_set_mac_address(slave->dev, addr);
3579                 if (res) {
3580                         /* TODO: consider downing the slave
3581                          * and retry ?
3582                          * User should expect communications
3583                          * breakage anyway until ARP finish
3584                          * updating, so...
3585                          */
3586                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3587                         goto unwind;
3588                 }
3589         }
3590 
3591         /* success */
3592         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3593         return 0;
3594 
3595 unwind:
3596         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3597         tmp_sa.sa_family = bond_dev->type;
3598 
3599         /* unwind from head to the slave that failed */
3600         bond_for_each_slave(bond, rollback_slave, iter) {
3601                 int tmp_res;
3602 
3603                 if (rollback_slave == slave)
3604                         break;
3605 
3606                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3607                 if (tmp_res) {
3608                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3609                                    tmp_res, rollback_slave->dev->name);
3610                 }
3611         }
3612 
3613         return res;
3614 }
3615 
3616 /**
3617  * bond_xmit_slave_id - transmit skb through slave with slave_id
3618  * @bond: bonding device that is transmitting
3619  * @skb: buffer to transmit
3620  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3621  *
3622  * This function tries to transmit through slave with slave_id but in case
3623  * it fails, it tries to find the first available slave for transmission.
3624  * The skb is consumed in all cases, thus the function is void.
3625  */
3626 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3627 {
3628         struct list_head *iter;
3629         struct slave *slave;
3630         int i = slave_id;
3631 
3632         /* Here we start from the slave with slave_id */
3633         bond_for_each_slave_rcu(bond, slave, iter) {
3634                 if (--i < 0) {
3635                         if (bond_slave_can_tx(slave)) {
3636                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3637                                 return;
3638                         }
3639                 }
3640         }
3641 
3642         /* Here we start from the first slave up to slave_id */
3643         i = slave_id;
3644         bond_for_each_slave_rcu(bond, slave, iter) {
3645                 if (--i < 0)
3646                         break;
3647                 if (bond_slave_can_tx(slave)) {
3648                         bond_dev_queue_xmit(bond, skb, slave->dev);
3649                         return;
3650                 }
3651         }
3652         /* no slave that can tx has been found */
3653         bond_tx_drop(bond->dev, skb);
3654 }
3655 
3656 /**
3657  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3658  * @bond: bonding device to use
3659  *
3660  * Based on the value of the bonding device's packets_per_slave parameter
3661  * this function generates a slave id, which is usually used as the next
3662  * slave to transmit through.
3663  */
3664 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3665 {
3666         u32 slave_id;
3667         struct reciprocal_value reciprocal_packets_per_slave;
3668         int packets_per_slave = bond->params.packets_per_slave;
3669 
3670         switch (packets_per_slave) {
3671         case 0:
3672                 slave_id = prandom_u32();
3673                 break;
3674         case 1:
3675                 slave_id = bond->rr_tx_counter;
3676                 break;
3677         default:
3678                 reciprocal_packets_per_slave =
3679                         bond->params.reciprocal_packets_per_slave;
3680                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3681                                              reciprocal_packets_per_slave);
3682                 break;
3683         }
3684         bond->rr_tx_counter++;
3685 
3686         return slave_id;
3687 }
3688 
3689 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3690 {
3691         struct bonding *bond = netdev_priv(bond_dev);
3692         struct iphdr *iph = ip_hdr(skb);
3693         struct slave *slave;
3694         u32 slave_id;
3695 
3696         /* Start with the curr_active_slave that joined the bond as the
3697          * default for sending IGMP traffic.  For failover purposes one
3698          * needs to maintain some consistency for the interface that will
3699          * send the join/membership reports.  The curr_active_slave found
3700          * will send all of this type of traffic.
3701          */
3702         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3703                 slave = rcu_dereference(bond->curr_active_slave);
3704                 if (slave)
3705                         bond_dev_queue_xmit(bond, skb, slave->dev);
3706                 else
3707                         bond_xmit_slave_id(bond, skb, 0);
3708         } else {
3709                 int slave_cnt = ACCESS_ONCE(bond->slave_cnt);
3710 
3711                 if (likely(slave_cnt)) {
3712                         slave_id = bond_rr_gen_slave_id(bond);
3713                         bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3714                 } else {
3715                         bond_tx_drop(bond_dev, skb);
3716                 }
3717         }
3718 
3719         return NETDEV_TX_OK;
3720 }
3721 
3722 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
3723  * the bond has a usable interface.
3724  */
3725 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3726 {
3727         struct bonding *bond = netdev_priv(bond_dev);
3728         struct slave *slave;
3729 
3730         slave = rcu_dereference(bond->curr_active_slave);
3731         if (slave)
3732                 bond_dev_queue_xmit(bond, skb, slave->dev);
3733         else
3734                 bond_tx_drop(bond_dev, skb);
3735 
3736         return NETDEV_TX_OK;
3737 }
3738 
3739 /* Use this to update slave_array when (a) it's not appropriate to update
3740  * slave_array right away (note that update_slave_array() may sleep)
3741  * and / or (b) RTNL is not held.
3742  */
3743 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3744 {
3745         queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3746 }
3747 
3748 /* Slave array work handler. Holds only RTNL */
3749 static void bond_slave_arr_handler(struct work_struct *work)
3750 {
3751         struct bonding *bond = container_of(work, struct bonding,
3752                                             slave_arr_work.work);
3753         int ret;
3754 
3755         if (!rtnl_trylock())
3756                 goto err;
3757 
3758         ret = bond_update_slave_arr(bond, NULL);
3759         rtnl_unlock();
3760         if (ret) {
3761                 pr_warn_ratelimited("Failed to update slave array from WT\n");
3762                 goto err;
3763         }
3764         return;
3765 
3766 err:
3767         bond_slave_arr_work_rearm(bond, 1);
3768 }
3769 
3770 /* Build the usable slaves array in control path for modes that use xmit-hash
3771  * to determine the slave interface -
3772  * (a) BOND_MODE_8023AD
3773  * (b) BOND_MODE_XOR
3774  * (c) BOND_MODE_TLB && tlb_dynamic_lb == 0
3775  *
3776  * The caller is expected to hold RTNL only and NO other lock!
3777  */
3778 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3779 {
3780         struct slave *slave;
3781         struct list_head *iter;
3782         struct bond_up_slave *new_arr, *old_arr;
3783         int slaves_in_agg;
3784         int agg_id = 0;
3785         int ret = 0;
3786 
3787 #ifdef CONFIG_LOCKDEP
3788         WARN_ON(lockdep_is_held(&bond->mode_lock));
3789 #endif
3790 
3791         new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3792                           GFP_KERNEL);
3793         if (!new_arr) {
3794                 ret = -ENOMEM;
3795                 pr_err("Failed to build slave-array.\n");
3796                 goto out;
3797         }
3798         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3799                 struct ad_info ad_info;
3800 
3801                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3802                         pr_debug("bond_3ad_get_active_agg_info failed\n");
3803                         kfree_rcu(new_arr, rcu);
3804                         /* No active aggragator means it's not safe to use
3805                          * the previous array.
3806                          */
3807                         old_arr = rtnl_dereference(bond->slave_arr);
3808                         if (old_arr) {
3809                                 RCU_INIT_POINTER(bond->slave_arr, NULL);
3810                                 kfree_rcu(old_arr, rcu);
3811                         }
3812                         goto out;
3813                 }
3814                 slaves_in_agg = ad_info.ports;
3815                 agg_id = ad_info.aggregator_id;
3816         }
3817         bond_for_each_slave(bond, slave, iter) {
3818                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3819                         struct aggregator *agg;
3820 
3821                         agg = SLAVE_AD_INFO(slave)->port.aggregator;
3822                         if (!agg || agg->aggregator_identifier != agg_id)
3823                                 continue;
3824                 }
3825                 if (!bond_slave_can_tx(slave))
3826                         continue;
3827                 if (skipslave == slave)
3828                         continue;
3829                 new_arr->arr[new_arr->count++] = slave;
3830         }
3831 
3832         old_arr = rtnl_dereference(bond->slave_arr);
3833         rcu_assign_pointer(bond->slave_arr, new_arr);
3834         if (old_arr)
3835                 kfree_rcu(old_arr, rcu);
3836 out:
3837         if (ret != 0 && skipslave) {
3838                 int idx;
3839 
3840                 /* Rare situation where caller has asked to skip a specific
3841                  * slave but allocation failed (most likely!). BTW this is
3842                  * only possible when the call is initiated from
3843                  * __bond_release_one(). In this situation; overwrite the
3844                  * skipslave entry in the array with the last entry from the
3845                  * array to avoid a situation where the xmit path may choose
3846                  * this to-be-skipped slave to send a packet out.
3847                  */
3848                 old_arr = rtnl_dereference(bond->slave_arr);
3849                 for (idx = 0; idx < old_arr->count; idx++) {
3850                         if (skipslave == old_arr->arr[idx]) {
3851                                 old_arr->arr[idx] =
3852                                     old_arr->arr[old_arr->count-1];
3853                                 old_arr->count--;
3854                                 break;
3855                         }
3856                 }
3857         }
3858         return ret;
3859 }
3860 
3861 /* Use this Xmit function for 3AD as well as XOR modes. The current
3862  * usable slave array is formed in the control path. The xmit function
3863  * just calculates hash and sends the packet out.
3864  */
3865 static int bond_3ad_xor_xmit(struct sk_buff *skb, struct net_device *dev)
3866 {
3867         struct bonding *bond = netdev_priv(dev);
3868         struct slave *slave;
3869         struct bond_up_slave *slaves;
3870         unsigned int count;
3871 
3872         slaves = rcu_dereference(bond->slave_arr);
3873         count = slaves ? ACCESS_ONCE(slaves->count) : 0;
3874         if (likely(count)) {
3875                 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
3876                 bond_dev_queue_xmit(bond, skb, slave->dev);
3877         } else {
3878                 bond_tx_drop(dev, skb);
3879         }
3880 
3881         return NETDEV_TX_OK;
3882 }
3883 
3884 /* in broadcast mode, we send everything to all usable interfaces. */
3885 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3886 {
3887         struct bonding *bond = netdev_priv(bond_dev);
3888         struct slave *slave = NULL;
3889         struct list_head *iter;
3890 
3891         bond_for_each_slave_rcu(bond, slave, iter) {
3892                 if (bond_is_last_slave(bond, slave))
3893                         break;
3894                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3895                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3896 
3897                         if (!skb2) {
3898                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3899                                                     bond_dev->name, __func__);
3900                                 continue;
3901                         }
3902                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3903                 }
3904         }
3905         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3906                 bond_dev_queue_xmit(bond, skb, slave->dev);
3907         else
3908                 bond_tx_drop(bond_dev, skb);
3909 
3910         return NETDEV_TX_OK;
3911 }
3912 
3913 /*------------------------- Device initialization ---------------------------*/
3914 
3915 /* Lookup the slave that corresponds to a qid */
3916 static inline int bond_slave_override(struct bonding *bond,
3917                                       struct sk_buff *skb)
3918 {
3919         struct slave *slave = NULL;
3920         struct list_head *iter;
3921 
3922         if (!skb->queue_mapping)
3923                 return 1;
3924 
3925         /* Find out if any slaves have the same mapping as this skb. */
3926         bond_for_each_slave_rcu(bond, slave, iter) {
3927                 if (slave->queue_id == skb->queue_mapping) {
3928                         if (bond_slave_is_up(slave) &&
3929                             slave->link == BOND_LINK_UP) {
3930                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3931                                 return 0;
3932                         }
3933                         /* If the slave isn't UP, use default transmit policy. */
3934                         break;
3935                 }
3936         }
3937 
3938         return 1;
3939 }
3940 
3941 
3942 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3943                              void *accel_priv, select_queue_fallback_t fallback)
3944 {
3945         /* This helper function exists to help dev_pick_tx get the correct
3946          * destination queue.  Using a helper function skips a call to
3947          * skb_tx_hash and will put the skbs in the queue we expect on their
3948          * way down to the bonding driver.
3949          */
3950         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3951 
3952         /* Save the original txq to restore before passing to the driver */
3953         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3954 
3955         if (unlikely(txq >= dev->real_num_tx_queues)) {
3956                 do {
3957                         txq -= dev->real_num_tx_queues;
3958                 } while (txq >= dev->real_num_tx_queues);
3959         }
3960         return txq;
3961 }
3962 
3963 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3964 {
3965         struct bonding *bond = netdev_priv(dev);
3966 
3967         if (bond_should_override_tx_queue(bond) &&
3968             !bond_slave_override(bond, skb))
3969                 return NETDEV_TX_OK;
3970 
3971         switch (BOND_MODE(bond)) {
3972         case BOND_MODE_ROUNDROBIN:
3973                 return bond_xmit_roundrobin(skb, dev);
3974         case BOND_MODE_ACTIVEBACKUP:
3975                 return bond_xmit_activebackup(skb, dev);
3976         case BOND_MODE_8023AD:
3977         case BOND_MODE_XOR:
3978                 return bond_3ad_xor_xmit(skb, dev);
3979         case BOND_MODE_BROADCAST:
3980                 return bond_xmit_broadcast(skb, dev);
3981         case BOND_MODE_ALB:
3982                 return bond_alb_xmit(skb, dev);
3983         case BOND_MODE_TLB:
3984                 return bond_tlb_xmit(skb, dev);
3985         default:
3986                 /* Should never happen, mode already checked */
3987                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3988                 WARN_ON_ONCE(1);
3989                 bond_tx_drop(dev, skb);
3990                 return NETDEV_TX_OK;
3991         }
3992 }
3993 
3994 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3995 {
3996         struct bonding *bond = netdev_priv(dev);
3997         netdev_tx_t ret = NETDEV_TX_OK;
3998 
3999         /* If we risk deadlock from transmitting this in the
4000          * netpoll path, tell netpoll to queue the frame for later tx
4001          */
4002         if (unlikely(is_netpoll_tx_blocked(dev)))
4003                 return NETDEV_TX_BUSY;
4004 
4005         rcu_read_lock();
4006         if (bond_has_slaves(bond))
4007                 ret = __bond_start_xmit(skb, dev);
4008         else
4009                 bond_tx_drop(dev, skb);
4010         rcu_read_unlock();
4011 
4012         return ret;
4013 }
4014 
4015 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4016                                      struct ethtool_cmd *ecmd)
4017 {
4018         struct bonding *bond = netdev_priv(bond_dev);
4019         unsigned long speed = 0;
4020         struct list_head *iter;
4021         struct slave *slave;
4022 
4023         ecmd->duplex = DUPLEX_UNKNOWN;
4024         ecmd->port = PORT_OTHER;
4025 
4026         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4027          * do not need to check mode.  Though link speed might not represent
4028          * the true receive or transmit bandwidth (not all modes are symmetric)
4029          * this is an accurate maximum.
4030          */
4031         bond_for_each_slave(bond, slave, iter) {
4032                 if (bond_slave_can_tx(slave)) {
4033                         if (slave->speed != SPEED_UNKNOWN)
4034                                 speed += slave->speed;
4035                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
4036                             slave->duplex != DUPLEX_UNKNOWN)
4037                                 ecmd->duplex = slave->duplex;
4038                 }
4039         }
4040         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4041 
4042         return 0;
4043 }
4044 
4045 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4046                                      struct ethtool_drvinfo *drvinfo)
4047 {
4048         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4049         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4050         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4051                  BOND_ABI_VERSION);
4052 }
4053 
4054 static const struct ethtool_ops bond_ethtool_ops = {
4055         .get_drvinfo            = bond_ethtool_get_drvinfo,
4056         .get_settings           = bond_ethtool_get_settings,
4057         .get_link               = ethtool_op_get_link,
4058 };
4059 
4060 static const struct net_device_ops bond_netdev_ops = {
4061         .ndo_init               = bond_init,
4062         .ndo_uninit             = bond_uninit,
4063         .ndo_open               = bond_open,
4064         .ndo_stop               = bond_close,
4065         .ndo_start_xmit         = bond_start_xmit,
4066         .ndo_select_queue       = bond_select_queue,
4067         .ndo_get_stats64        = bond_get_stats,
4068         .ndo_do_ioctl           = bond_do_ioctl,
4069         .ndo_change_rx_flags    = bond_change_rx_flags,
4070         .ndo_set_rx_mode        = bond_set_rx_mode,
4071         .ndo_change_mtu         = bond_change_mtu,
4072         .ndo_set_mac_address    = bond_set_mac_address,
4073         .ndo_neigh_setup        = bond_neigh_setup,
4074         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4075         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4076 #ifdef CONFIG_NET_POLL_CONTROLLER
4077         .ndo_netpoll_setup      = bond_netpoll_setup,
4078         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4079         .ndo_poll_controller    = bond_poll_controller,
4080 #endif
4081         .ndo_add_slave          = bond_enslave,
4082         .ndo_del_slave          = bond_release,
4083         .ndo_fix_features       = bond_fix_features,
4084         .ndo_bridge_setlink     = switchdev_port_bridge_setlink,
4085         .ndo_bridge_getlink     = switchdev_port_bridge_getlink,
4086         .ndo_bridge_dellink     = switchdev_port_bridge_dellink,
4087         .ndo_fdb_add            = switchdev_port_fdb_add,
4088         .ndo_fdb_del            = switchdev_port_fdb_del,
4089         .ndo_fdb_dump           = switchdev_port_fdb_dump,
4090         .ndo_features_check     = passthru_features_check,
4091 };
4092 
4093 static const struct device_type bond_type = {
4094         .name = "bond",
4095 };
4096 
4097 static void bond_destructor(struct net_device *bond_dev)
4098 {
4099         struct bonding *bond = netdev_priv(bond_dev);
4100         if (bond->wq)
4101                 destroy_workqueue(bond->wq);
4102         free_netdev(bond_dev);
4103 }
4104 
4105 void bond_setup(struct net_device *bond_dev)
4106 {
4107         struct bonding *bond = netdev_priv(bond_dev);
4108 
4109         spin_lock_init(&bond->mode_lock);
4110         bond->params = bonding_defaults;
4111 
4112         /* Initialize pointers */
4113         bond->dev = bond_dev;
4114 
4115         /* Initialize the device entry points */
4116         ether_setup(bond_dev);
4117         bond_dev->netdev_ops = &bond_netdev_ops;
4118         bond_dev->ethtool_ops = &bond_ethtool_ops;
4119 
4120         bond_dev->destructor = bond_destructor;
4121 
4122         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4123 
4124         /* Initialize the device options */
4125         bond_dev->tx_queue_len = 0;
4126         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4127         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
4128         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4129 
4130         /* don't acquire bond device's netif_tx_lock when transmitting */
4131         bond_dev->features |= NETIF_F_LLTX;
4132 
4133         /* By default, we declare the bond to be fully
4134          * VLAN hardware accelerated capable. Special
4135          * care is taken in the various xmit functions
4136          * when there are slaves that are not hw accel
4137          * capable
4138          */
4139 
4140         /* Don't allow bond devices to change network namespaces. */
4141         bond_dev->features |= NETIF_F_NETNS_LOCAL;
4142 
4143         bond_dev->hw_features = BOND_VLAN_FEATURES |
4144                                 NETIF_F_HW_VLAN_CTAG_TX |
4145                                 NETIF_F_HW_VLAN_CTAG_RX |
4146                                 NETIF_F_HW_VLAN_CTAG_FILTER;
4147 
4148         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4149         bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4150         bond_dev->features |= bond_dev->hw_features;
4151 }
4152 
4153 /* Destroy a bonding device.
4154  * Must be under rtnl_lock when this function is called.
4155  */
4156 static void bond_uninit(struct net_device *bond_dev)
4157 {
4158         struct bonding *bond = netdev_priv(bond_dev);
4159         struct list_head *iter;
4160         struct slave *slave;
4161         struct bond_up_slave *arr;
4162 
4163         bond_netpoll_cleanup(bond_dev);
4164 
4165         /* Release the bonded slaves */
4166         bond_for_each_slave(bond, slave, iter)
4167                 __bond_release_one(bond_dev, slave->dev, true);
4168         netdev_info(bond_dev, "Released all slaves\n");
4169 
4170         arr = rtnl_dereference(bond->slave_arr);
4171         if (arr) {
4172                 RCU_INIT_POINTER(bond->slave_arr, NULL);
4173                 kfree_rcu(arr, rcu);
4174         }
4175 
4176         list_del(&bond->bond_list);
4177 
4178         bond_debug_unregister(bond);
4179 }
4180 
4181 /*------------------------- Module initialization ---------------------------*/
4182 
4183 static int bond_check_params(struct bond_params *params)
4184 {
4185         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4186         struct bond_opt_value newval;
4187         const struct bond_opt_value *valptr;
4188         int arp_all_targets_value;
4189         u16 ad_actor_sys_prio = 0;
4190         u16 ad_user_port_key = 0;
4191 
4192         /* Convert string parameters. */
4193         if (mode) {
4194                 bond_opt_initstr(&newval, mode);
4195                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4196                 if (!valptr) {
4197                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4198                         return -EINVAL;
4199                 }
4200                 bond_mode = valptr->value;
4201         }
4202 
4203         if (xmit_hash_policy) {
4204                 if ((bond_mode != BOND_MODE_XOR) &&
4205                     (bond_mode != BOND_MODE_8023AD) &&
4206                     (bond_mode != BOND_MODE_TLB)) {
4207                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4208                                 bond_mode_name(bond_mode));
4209                 } else {
4210                         bond_opt_initstr(&newval, xmit_hash_policy);
4211                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4212                                                 &newval);
4213                         if (!valptr) {
4214                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4215                                        xmit_hash_policy);
4216                                 return -EINVAL;
4217                         }
4218                         xmit_hashtype = valptr->value;
4219                 }
4220         }
4221 
4222         if (lacp_rate) {
4223                 if (bond_mode != BOND_MODE_8023AD) {
4224                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4225                                 bond_mode_name(bond_mode));
4226                 } else {
4227                         bond_opt_initstr(&newval, lacp_rate);
4228                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4229                                                 &newval);
4230                         if (!valptr) {
4231                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4232                                        lacp_rate);
4233                                 return -EINVAL;
4234                         }
4235                         lacp_fast = valptr->value;
4236                 }
4237         }
4238 
4239         if (ad_select) {
4240                 bond_opt_initstr(&newval, ad_select);
4241                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4242                                         &newval);
4243                 if (!valptr) {
4244                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4245                         return -EINVAL;
4246                 }
4247                 params->ad_select = valptr->value;
4248                 if (bond_mode != BOND_MODE_8023AD)
4249                         pr_warn("ad_select param only affects 802.3ad mode\n");
4250         } else {
4251                 params->ad_select = BOND_AD_STABLE;
4252         }
4253 
4254         if (max_bonds < 0) {
4255                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4256                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4257                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4258         }
4259 
4260         if (miimon < 0) {
4261                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4262                         miimon, INT_MAX);
4263                 miimon = 0;
4264         }
4265 
4266         if (updelay < 0) {
4267                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4268                         updelay, INT_MAX);
4269                 updelay = 0;
4270         }
4271 
4272         if (downdelay < 0) {
4273                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4274                         downdelay, INT_MAX);
4275                 downdelay = 0;
4276         }
4277 
4278         if ((use_carrier != 0) && (use_carrier != 1)) {
4279                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4280                         use_carrier);
4281                 use_carrier = 1;
4282         }
4283 
4284         if (num_peer_notif < 0 || num_peer_notif > 255) {
4285                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4286                         num_peer_notif);
4287                 num_peer_notif = 1;
4288         }
4289 
4290         /* reset values for 802.3ad/TLB/ALB */
4291         if (!bond_mode_uses_arp(bond_mode)) {
4292                 if (!miimon) {
4293                         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");
4294                         pr_warn("Forcing miimon to 100msec\n");
4295                         miimon = BOND_DEFAULT_MIIMON;
4296                 }
4297         }
4298 
4299         if (tx_queues < 1 || tx_queues > 255) {
4300                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4301                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4302                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4303         }
4304 
4305         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4306                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4307                         all_slaves_active);
4308                 all_slaves_active = 0;
4309         }
4310 
4311         if (resend_igmp < 0 || resend_igmp > 255) {
4312                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4313                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4314                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4315         }
4316 
4317         bond_opt_initval(&newval, packets_per_slave);
4318         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4319                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4320                         packets_per_slave, USHRT_MAX);
4321                 packets_per_slave = 1;
4322         }
4323 
4324         if (bond_mode == BOND_MODE_ALB) {
4325                 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",
4326                           updelay);
4327         }
4328 
4329         if (!miimon) {
4330                 if (updelay || downdelay) {
4331                         /* just warn the user the up/down delay will have
4332                          * no effect since miimon is zero...
4333                          */
4334                         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",
4335                                 updelay, downdelay);
4336                 }
4337         } else {
4338                 /* don't allow arp monitoring */
4339                 if (arp_interval) {
4340                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4341                                 miimon, arp_interval);
4342                         arp_interval = 0;
4343                 }
4344 
4345                 if ((updelay % miimon) != 0) {
4346                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4347                                 updelay, miimon, (updelay / miimon) * miimon);
4348                 }
4349 
4350                 updelay /= miimon;
4351 
4352                 if ((downdelay % miimon) != 0) {
4353                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4354                                 downdelay, miimon,
4355                                 (downdelay / miimon) * miimon);
4356                 }
4357 
4358                 downdelay /= miimon;
4359         }
4360 
4361         if (arp_interval < 0) {
4362                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4363                         arp_interval, INT_MAX);
4364                 arp_interval = 0;
4365         }
4366 
4367         for (arp_ip_count = 0, i = 0;
4368              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4369                 __be32 ip;
4370 
4371                 /* not a complete check, but good enough to catch mistakes */
4372                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4373                     !bond_is_ip_target_ok(ip)) {
4374                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4375                                 arp_ip_target[i]);
4376                         arp_interval = 0;
4377                 } else {
4378                         if (bond_get_targets_ip(arp_target, ip) == -1)
4379                                 arp_target[arp_ip_count++] = ip;
4380                         else
4381                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4382                                         &ip);
4383                 }
4384         }
4385 
4386         if (arp_interval && !arp_ip_count) {
4387                 /* don't allow arping if no arp_ip_target given... */
4388                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4389                         arp_interval);
4390                 arp_interval = 0;
4391         }
4392 
4393         if (arp_validate) {
4394                 if (!arp_interval) {
4395                         pr_err("arp_validate requires arp_interval\n");
4396                         return -EINVAL;
4397                 }
4398 
4399                 bond_opt_initstr(&newval, arp_validate);
4400                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4401                                         &newval);
4402                 if (!valptr) {
4403                         pr_err("Error: invalid arp_validate \"%s\"\n",
4404                                arp_validate);
4405                         return -EINVAL;
4406                 }
4407                 arp_validate_value = valptr->value;
4408         } else {
4409                 arp_validate_value = 0;
4410         }
4411 
4412         arp_all_targets_value = 0;
4413         if (arp_all_targets) {
4414                 bond_opt_initstr(&newval, arp_all_targets);
4415                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4416                                         &newval);
4417                 if (!valptr) {
4418                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4419                                arp_all_targets);
4420                         arp_all_targets_value = 0;
4421                 } else {
4422                         arp_all_targets_value = valptr->value;
4423                 }
4424         }
4425 
4426         if (miimon) {
4427                 pr_info("MII link monitoring set to %d ms\n", miimon);
4428         } else if (arp_interval) {
4429                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4430                                           arp_validate_value);
4431                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4432                         arp_interval, valptr->string, arp_ip_count);
4433 
4434                 for (i = 0; i < arp_ip_count; i++)
4435                         pr_cont(" %s", arp_ip_target[i]);
4436 
4437                 pr_cont("\n");
4438 
4439         } else if (max_bonds) {
4440                 /* miimon and arp_interval not set, we need one so things
4441                  * work as expected, see bonding.txt for details
4442                  */
4443                 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");
4444         }
4445 
4446         if (primary && !bond_mode_uses_primary(bond_mode)) {
4447                 /* currently, using a primary only makes sense
4448                  * in active backup, TLB or ALB modes
4449                  */
4450                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4451                         primary, bond_mode_name(bond_mode));
4452                 primary = NULL;
4453         }
4454 
4455         if (primary && primary_reselect) {
4456                 bond_opt_initstr(&newval, primary_reselect);
4457                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4458                                         &newval);
4459                 if (!valptr) {
4460                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4461                                primary_reselect);
4462                         return -EINVAL;
4463                 }
4464                 primary_reselect_value = valptr->value;
4465         } else {
4466                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4467         }
4468 
4469         if (fail_over_mac) {
4470                 bond_opt_initstr(&newval, fail_over_mac);
4471                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4472                                         &newval);
4473                 if (!valptr) {
4474                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4475                                fail_over_mac);
4476                         return -EINVAL;
4477                 }
4478                 fail_over_mac_value = valptr->value;
4479                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4480                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4481         } else {
4482                 fail_over_mac_value = BOND_FOM_NONE;
4483         }
4484 
4485         bond_opt_initstr(&newval, "default");
4486         valptr = bond_opt_parse(
4487                         bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4488                                      &newval);
4489         if (!valptr) {
4490                 pr_err("Error: No ad_actor_sys_prio default value");
4491                 return -EINVAL;
4492         }
4493         ad_actor_sys_prio = valptr->value;
4494 
4495         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4496                                 &newval);
4497         if (!valptr) {
4498                 pr_err("Error: No ad_user_port_key default value");
4499                 return -EINVAL;
4500         }
4501         ad_user_port_key = valptr->value;
4502 
4503         if (lp_interval == 0) {
4504                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4505                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4506                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4507         }
4508 
4509         /* fill params struct with the proper values */
4510         params->mode = bond_mode;
4511         params->xmit_policy = xmit_hashtype;
4512         params->miimon = miimon;
4513         params->num_peer_notif = num_peer_notif;
4514         params->arp_interval = arp_interval;
4515         params->arp_validate = arp_validate_value;
4516         params->arp_all_targets = arp_all_targets_value;
4517         params->updelay = updelay;
4518         params->downdelay = downdelay;
4519         params->use_carrier = use_carrier;
4520         params->lacp_fast = lacp_fast;
4521         params->primary[0] = 0;
4522         params->primary_reselect = primary_reselect_value;
4523         params->fail_over_mac = fail_over_mac_value;
4524         params->tx_queues = tx_queues;
4525         params->all_slaves_active = all_slaves_active;
4526         params->resend_igmp = resend_igmp;
4527         params->min_links = min_links;
4528         params->lp_interval = lp_interval;
4529         params->packets_per_slave = packets_per_slave;
4530         params->tlb_dynamic_lb = 1; /* Default value */
4531         params->ad_actor_sys_prio = ad_actor_sys_prio;
4532         eth_zero_addr(params->ad_actor_system);
4533         params->ad_user_port_key = ad_user_port_key;
4534         if (packets_per_slave > 0) {
4535                 params->reciprocal_packets_per_slave =
4536                         reciprocal_value(packets_per_slave);
4537         } else {
4538                 /* reciprocal_packets_per_slave is unused if
4539                  * packets_per_slave is 0 or 1, just initialize it
4540                  */
4541                 params->reciprocal_packets_per_slave =
4542                         (struct reciprocal_value) { 0 };
4543         }
4544 
4545         if (primary) {
4546                 strncpy(params->primary, primary, IFNAMSIZ);
4547                 params->primary[IFNAMSIZ - 1] = 0;
4548         }
4549 
4550         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4551 
4552         return 0;
4553 }
4554 
4555 static struct lock_class_key bonding_netdev_xmit_lock_key;
4556 static struct lock_class_key bonding_netdev_addr_lock_key;
4557 static struct lock_class_key bonding_tx_busylock_key;
4558 
4559 static void bond_set_lockdep_class_one(struct net_device *dev,
4560                                        struct netdev_queue *txq,
4561                                        void *_unused)
4562 {
4563         lockdep_set_class(&txq->_xmit_lock,
4564                           &bonding_netdev_xmit_lock_key);
4565 }
4566 
4567 static void bond_set_lockdep_class(struct net_device *dev)
4568 {
4569         lockdep_set_class(&dev->addr_list_lock,
4570                           &bonding_netdev_addr_lock_key);
4571         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4572         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4573 }
4574 
4575 /* Called from registration process */
4576 static int bond_init(struct net_device *bond_dev)
4577 {
4578         struct bonding *bond = netdev_priv(bond_dev);
4579         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4580 
4581         netdev_dbg(bond_dev, "Begin bond_init\n");
4582 
4583         bond->wq = create_singlethread_workqueue(bond_dev->name);
4584         if (!bond->wq)
4585                 return -ENOMEM;
4586 
4587         bond_set_lockdep_class(bond_dev);
4588 
4589         list_add_tail(&bond->bond_list, &bn->dev_list);
4590 
4591         bond_prepare_sysfs_group(bond);
4592 
4593         bond_debug_register(bond);
4594 
4595         /* Ensure valid dev_addr */
4596         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4597             bond_dev->addr_assign_type == NET_ADDR_PERM)
4598                 eth_hw_addr_random(bond_dev);
4599 
4600         return 0;
4601 }
4602 
4603 unsigned int bond_get_num_tx_queues(void)
4604 {
4605         return tx_queues;
4606 }
4607 
4608 /* Create a new bond based on the specified name and bonding parameters.
4609  * If name is NULL, obtain a suitable "bond%d" name for us.
4610  * Caller must NOT hold rtnl_lock; we need to release it here before we
4611  * set up our sysfs entries.
4612  */
4613 int bond_create(struct net *net, const char *name)
4614 {
4615         struct net_device *bond_dev;
4616         struct bonding *bond;
4617         struct alb_bond_info *bond_info;
4618         int res;
4619 
4620         rtnl_lock();
4621 
4622         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4623                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4624                                    bond_setup, tx_queues);
4625         if (!bond_dev) {
4626                 pr_err("%s: eek! can't alloc netdev!\n", name);
4627                 rtnl_unlock();
4628                 return -ENOMEM;
4629         }
4630 
4631         /*
4632          * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4633          * It is set to 0 by default which is wrong.
4634          */
4635         bond = netdev_priv(bond_dev);
4636         bond_info = &(BOND_ALB_INFO(bond));
4637         bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4638 
4639         dev_net_set(bond_dev, net);
4640         bond_dev->rtnl_link_ops = &bond_link_ops;
4641 
4642         res = register_netdevice(bond_dev);
4643 
4644         netif_carrier_off(bond_dev);
4645 
4646         rtnl_unlock();
4647         if (res < 0)
4648                 bond_destructor(bond_dev);
4649         return res;
4650 }
4651 
4652 static int __net_init bond_net_init(struct net *net)
4653 {
4654         struct bond_net *bn = net_generic(net, bond_net_id);
4655 
4656         bn->net = net;
4657         INIT_LIST_HEAD(&bn->dev_list);
4658 
4659         bond_create_proc_dir(bn);
4660         bond_create_sysfs(bn);
4661 
4662         return 0;
4663 }
4664 
4665 static void __net_exit bond_net_exit(struct net *net)
4666 {
4667         struct bond_net *bn = net_generic(net, bond_net_id);
4668         struct bonding *bond, *tmp_bond;
4669         LIST_HEAD(list);
4670 
4671         bond_destroy_sysfs(bn);
4672 
4673         /* Kill off any bonds created after unregistering bond rtnl ops */
4674         rtnl_lock();
4675         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4676                 unregister_netdevice_queue(bond->dev, &list);
4677         unregister_netdevice_many(&list);
4678         rtnl_unlock();
4679 
4680         bond_destroy_proc_dir(bn);
4681 }
4682 
4683 static struct pernet_operations bond_net_ops = {
4684         .init = bond_net_init,
4685         .exit = bond_net_exit,
4686         .id   = &bond_net_id,
4687         .size = sizeof(struct bond_net),
4688 };
4689 
4690 static int __init bonding_init(void)
4691 {
4692         int i;
4693         int res;
4694 
4695         pr_info("%s", bond_version);
4696 
4697         res = bond_check_params(&bonding_defaults);
4698         if (res)
4699                 goto out;
4700 
4701         res = register_pernet_subsys(&bond_net_ops);
4702         if (res)
4703                 goto out;
4704 
4705         res = bond_netlink_init();
4706         if (res)
4707                 goto err_link;
4708 
4709         bond_create_debugfs();
4710 
4711         for (i = 0; i < max_bonds; i++) {
4712                 res = bond_create(&init_net, NULL);
4713                 if (res)
4714                         goto err;
4715         }
4716 
4717         register_netdevice_notifier(&bond_netdev_notifier);
4718 out:
4719         return res;
4720 err:
4721         bond_destroy_debugfs();
4722         bond_netlink_fini();
4723 err_link:
4724         unregister_pernet_subsys(&bond_net_ops);
4725         goto out;
4726 
4727 }
4728 
4729 static void __exit bonding_exit(void)
4730 {
4731         unregister_netdevice_notifier(&bond_netdev_notifier);
4732 
4733         bond_destroy_debugfs();
4734 
4735         bond_netlink_fini();
4736         unregister_pernet_subsys(&bond_net_ops);
4737 
4738 #ifdef CONFIG_NET_POLL_CONTROLLER
4739         /* Make sure we don't have an imbalance on our netpoll blocking */
4740         WARN_ON(atomic_read(&netpoll_block_tx));
4741 #endif
4742 }
4743 
4744 module_init(bonding_init);
4745 module_exit(bonding_exit);
4746 MODULE_LICENSE("GPL");
4747 MODULE_VERSION(DRV_VERSION);
4748 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4749 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4750 

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