ed00ba919d91f24b0f7ac03f6a966641e9b58bd2
[pandora-kernel.git] / 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/system.h>
56 #include <asm/dma.h>
57 #include <linux/uaccess.h>
58 #include <linux/errno.h>
59 #include <linux/netdevice.h>
60 #include <linux/inetdevice.h>
61 #include <linux/igmp.h>
62 #include <linux/etherdevice.h>
63 #include <linux/skbuff.h>
64 #include <net/sock.h>
65 #include <linux/rtnetlink.h>
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
68 #include <linux/smp.h>
69 #include <linux/if_ether.h>
70 #include <net/arp.h>
71 #include <linux/mii.h>
72 #include <linux/ethtool.h>
73 #include <linux/if_vlan.h>
74 #include <linux/if_bonding.h>
75 #include <linux/jiffies.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include "bonding.h"
79 #include "bond_3ad.h"
80 #include "bond_alb.h"
81
82 /*---------------------------- Module parameters ----------------------------*/
83
84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
85 #define BOND_LINK_MON_INTERV    0
86 #define BOND_LINK_ARP_INTERV    0
87
88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
89 static int num_grat_arp = 1;
90 static int num_unsol_na = 1;
91 static int miimon       = BOND_LINK_MON_INTERV;
92 static int updelay;
93 static int downdelay;
94 static int use_carrier  = 1;
95 static char *mode;
96 static char *primary;
97 static char *lacp_rate;
98 static char *ad_select;
99 static char *xmit_hash_policy;
100 static int arp_interval = BOND_LINK_ARP_INTERV;
101 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
102 static char *arp_validate;
103 static char *fail_over_mac;
104 static struct bond_params bonding_defaults;
105
106 module_param(max_bonds, int, 0);
107 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
108 module_param(num_grat_arp, int, 0644);
109 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
110 module_param(num_unsol_na, int, 0644);
111 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
112 module_param(miimon, int, 0);
113 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
114 module_param(updelay, int, 0);
115 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
116 module_param(downdelay, int, 0);
117 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
118                             "in milliseconds");
119 module_param(use_carrier, int, 0);
120 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
121                               "0 for off, 1 for on (default)");
122 module_param(mode, charp, 0);
123 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
124                        "1 for active-backup, 2 for balance-xor, "
125                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
126                        "6 for balance-alb");
127 module_param(primary, charp, 0);
128 MODULE_PARM_DESC(primary, "Primary network device to use");
129 module_param(lacp_rate, charp, 0);
130 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
131                             "(slow/fast)");
132 module_param(ad_select, charp, 0);
133 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
134 module_param(xmit_hash_policy, charp, 0);
135 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
136                                    ", 1 for layer 3+4");
137 module_param(arp_interval, int, 0);
138 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
139 module_param_array(arp_ip_target, charp, NULL, 0);
140 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
141 module_param(arp_validate, charp, 0);
142 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
143 module_param(fail_over_mac, charp, 0);
144 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
145
146 /*----------------------------- Global variables ----------------------------*/
147
148 static const char * const version =
149         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
150
151 LIST_HEAD(bond_dev_list);
152
153 #ifdef CONFIG_PROC_FS
154 static struct proc_dir_entry *bond_proc_dir;
155 #endif
156
157 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
158 static int arp_ip_count;
159 static int bond_mode    = BOND_MODE_ROUNDROBIN;
160 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
161 static int lacp_fast;
162
163
164 const struct bond_parm_tbl bond_lacp_tbl[] = {
165 {       "slow",         AD_LACP_SLOW},
166 {       "fast",         AD_LACP_FAST},
167 {       NULL,           -1},
168 };
169
170 const struct bond_parm_tbl bond_mode_tbl[] = {
171 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
172 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
173 {       "balance-xor",          BOND_MODE_XOR},
174 {       "broadcast",            BOND_MODE_BROADCAST},
175 {       "802.3ad",              BOND_MODE_8023AD},
176 {       "balance-tlb",          BOND_MODE_TLB},
177 {       "balance-alb",          BOND_MODE_ALB},
178 {       NULL,                   -1},
179 };
180
181 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
182 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
183 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
184 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
185 {       NULL,                   -1},
186 };
187
188 const struct bond_parm_tbl arp_validate_tbl[] = {
189 {       "none",                 BOND_ARP_VALIDATE_NONE},
190 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
191 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
192 {       "all",                  BOND_ARP_VALIDATE_ALL},
193 {       NULL,                   -1},
194 };
195
196 const struct bond_parm_tbl fail_over_mac_tbl[] = {
197 {       "none",                 BOND_FOM_NONE},
198 {       "active",               BOND_FOM_ACTIVE},
199 {       "follow",               BOND_FOM_FOLLOW},
200 {       NULL,                   -1},
201 };
202
203 struct bond_parm_tbl ad_select_tbl[] = {
204 {       "stable",       BOND_AD_STABLE},
205 {       "bandwidth",    BOND_AD_BANDWIDTH},
206 {       "count",        BOND_AD_COUNT},
207 {       NULL,           -1},
208 };
209
210 /*-------------------------- Forward declarations ---------------------------*/
211
212 static void bond_send_gratuitous_arp(struct bonding *bond);
213 static int bond_init(struct net_device *bond_dev);
214 static void bond_deinit(struct net_device *bond_dev);
215
216 /*---------------------------- General routines -----------------------------*/
217
218 static const char *bond_mode_name(int mode)
219 {
220         static const char *names[] = {
221                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
222                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
223                 [BOND_MODE_XOR] = "load balancing (xor)",
224                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
225                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
226                 [BOND_MODE_TLB] = "transmit load balancing",
227                 [BOND_MODE_ALB] = "adaptive load balancing",
228         };
229
230         if (mode < 0 || mode > BOND_MODE_ALB)
231                 return "unknown";
232
233         return names[mode];
234 }
235
236 /*---------------------------------- VLAN -----------------------------------*/
237
238 /**
239  * bond_add_vlan - add a new vlan id on bond
240  * @bond: bond that got the notification
241  * @vlan_id: the vlan id to add
242  *
243  * Returns -ENOMEM if allocation failed.
244  */
245 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
246 {
247         struct vlan_entry *vlan;
248
249         pr_debug("bond: %s, vlan id %d\n",
250                 (bond ? bond->dev->name : "None"), vlan_id);
251
252         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
253         if (!vlan)
254                 return -ENOMEM;
255
256         INIT_LIST_HEAD(&vlan->vlan_list);
257         vlan->vlan_id = vlan_id;
258
259         write_lock_bh(&bond->lock);
260
261         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
262
263         write_unlock_bh(&bond->lock);
264
265         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
266
267         return 0;
268 }
269
270 /**
271  * bond_del_vlan - delete a vlan id from bond
272  * @bond: bond that got the notification
273  * @vlan_id: the vlan id to delete
274  *
275  * returns -ENODEV if @vlan_id was not found in @bond.
276  */
277 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
278 {
279         struct vlan_entry *vlan;
280         int res = -ENODEV;
281
282         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
283
284         write_lock_bh(&bond->lock);
285
286         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
287                 if (vlan->vlan_id == vlan_id) {
288                         list_del(&vlan->vlan_list);
289
290                         if (bond_is_lb(bond))
291                                 bond_alb_clear_vlan(bond, vlan_id);
292
293                         pr_debug("removed VLAN ID %d from bond %s\n", vlan_id,
294                                 bond->dev->name);
295
296                         kfree(vlan);
297
298                         if (list_empty(&bond->vlan_list) &&
299                             (bond->slave_cnt == 0)) {
300                                 /* Last VLAN removed and no slaves, so
301                                  * restore block on adding VLANs. This will
302                                  * be removed once new slaves that are not
303                                  * VLAN challenged will be added.
304                                  */
305                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
306                         }
307
308                         res = 0;
309                         goto out;
310                 }
311         }
312
313         pr_debug("couldn't find VLAN ID %d in bond %s\n", vlan_id,
314                 bond->dev->name);
315
316 out:
317         write_unlock_bh(&bond->lock);
318         return res;
319 }
320
321 /**
322  * bond_has_challenged_slaves
323  * @bond: the bond we're working on
324  *
325  * Searches the slave list. Returns 1 if a vlan challenged slave
326  * was found, 0 otherwise.
327  *
328  * Assumes bond->lock is held.
329  */
330 static int bond_has_challenged_slaves(struct bonding *bond)
331 {
332         struct slave *slave;
333         int i;
334
335         bond_for_each_slave(bond, slave, i) {
336                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
337                         pr_debug("found VLAN challenged slave - %s\n",
338                                 slave->dev->name);
339                         return 1;
340                 }
341         }
342
343         pr_debug("no VLAN challenged slaves found\n");
344         return 0;
345 }
346
347 /**
348  * bond_next_vlan - safely skip to the next item in the vlans list.
349  * @bond: the bond we're working on
350  * @curr: item we're advancing from
351  *
352  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
353  * or @curr->next otherwise (even if it is @curr itself again).
354  *
355  * Caller must hold bond->lock
356  */
357 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
358 {
359         struct vlan_entry *next, *last;
360
361         if (list_empty(&bond->vlan_list))
362                 return NULL;
363
364         if (!curr) {
365                 next = list_entry(bond->vlan_list.next,
366                                   struct vlan_entry, vlan_list);
367         } else {
368                 last = list_entry(bond->vlan_list.prev,
369                                   struct vlan_entry, vlan_list);
370                 if (last == curr) {
371                         next = list_entry(bond->vlan_list.next,
372                                           struct vlan_entry, vlan_list);
373                 } else {
374                         next = list_entry(curr->vlan_list.next,
375                                           struct vlan_entry, vlan_list);
376                 }
377         }
378
379         return next;
380 }
381
382 /**
383  * bond_dev_queue_xmit - Prepare skb for xmit.
384  *
385  * @bond: bond device that got this skb for tx.
386  * @skb: hw accel VLAN tagged skb to transmit
387  * @slave_dev: slave that is supposed to xmit this skbuff
388  *
389  * When the bond gets an skb to transmit that is
390  * already hardware accelerated VLAN tagged, and it
391  * needs to relay this skb to a slave that is not
392  * hw accel capable, the skb needs to be "unaccelerated",
393  * i.e. strip the hwaccel tag and re-insert it as part
394  * of the payload.
395  */
396 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
397                         struct net_device *slave_dev)
398 {
399         unsigned short uninitialized_var(vlan_id);
400
401         if (!list_empty(&bond->vlan_list) &&
402             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
403             vlan_get_tag(skb, &vlan_id) == 0) {
404                 skb->dev = slave_dev;
405                 skb = vlan_put_tag(skb, vlan_id);
406                 if (!skb) {
407                         /* vlan_put_tag() frees the skb in case of error,
408                          * so return success here so the calling functions
409                          * won't attempt to free is again.
410                          */
411                         return 0;
412                 }
413         } else {
414                 skb->dev = slave_dev;
415         }
416
417         skb->priority = 1;
418         dev_queue_xmit(skb);
419
420         return 0;
421 }
422
423 /*
424  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
425  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
426  * lock because:
427  * a. This operation is performed in IOCTL context,
428  * b. The operation is protected by the RTNL semaphore in the 8021q code,
429  * c. Holding a lock with BH disabled while directly calling a base driver
430  *    entry point is generally a BAD idea.
431  *
432  * The design of synchronization/protection for this operation in the 8021q
433  * module is good for one or more VLAN devices over a single physical device
434  * and cannot be extended for a teaming solution like bonding, so there is a
435  * potential race condition here where a net device from the vlan group might
436  * be referenced (either by a base driver or the 8021q code) while it is being
437  * removed from the system. However, it turns out we're not making matters
438  * worse, and if it works for regular VLAN usage it will work here too.
439 */
440
441 /**
442  * bond_vlan_rx_register - Propagates registration to slaves
443  * @bond_dev: bonding net device that got called
444  * @grp: vlan group being registered
445  */
446 static void bond_vlan_rx_register(struct net_device *bond_dev,
447                                   struct vlan_group *grp)
448 {
449         struct bonding *bond = netdev_priv(bond_dev);
450         struct slave *slave;
451         int i;
452
453         bond->vlgrp = grp;
454
455         bond_for_each_slave(bond, slave, i) {
456                 struct net_device *slave_dev = slave->dev;
457                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
458
459                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
460                     slave_ops->ndo_vlan_rx_register) {
461                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
462                 }
463         }
464 }
465
466 /**
467  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
468  * @bond_dev: bonding net device that got called
469  * @vid: vlan id being added
470  */
471 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
472 {
473         struct bonding *bond = netdev_priv(bond_dev);
474         struct slave *slave;
475         int i, res;
476
477         bond_for_each_slave(bond, slave, i) {
478                 struct net_device *slave_dev = slave->dev;
479                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
480
481                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
482                     slave_ops->ndo_vlan_rx_add_vid) {
483                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
484                 }
485         }
486
487         res = bond_add_vlan(bond, vid);
488         if (res) {
489                 pr_err(DRV_NAME
490                        ": %s: Error: Failed to add vlan id %d\n",
491                        bond_dev->name, vid);
492         }
493 }
494
495 /**
496  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
497  * @bond_dev: bonding net device that got called
498  * @vid: vlan id being removed
499  */
500 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
501 {
502         struct bonding *bond = netdev_priv(bond_dev);
503         struct slave *slave;
504         struct net_device *vlan_dev;
505         int i, res;
506
507         bond_for_each_slave(bond, slave, i) {
508                 struct net_device *slave_dev = slave->dev;
509                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
510
511                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
512                     slave_ops->ndo_vlan_rx_kill_vid) {
513                         /* Save and then restore vlan_dev in the grp array,
514                          * since the slave's driver might clear it.
515                          */
516                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
517                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
518                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
519                 }
520         }
521
522         res = bond_del_vlan(bond, vid);
523         if (res) {
524                 pr_err(DRV_NAME
525                        ": %s: Error: Failed to remove vlan id %d\n",
526                        bond_dev->name, vid);
527         }
528 }
529
530 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
531 {
532         struct vlan_entry *vlan;
533         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
534
535         write_lock_bh(&bond->lock);
536
537         if (list_empty(&bond->vlan_list))
538                 goto out;
539
540         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
541             slave_ops->ndo_vlan_rx_register)
542                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
543
544         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
545             !(slave_ops->ndo_vlan_rx_add_vid))
546                 goto out;
547
548         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
549                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
550
551 out:
552         write_unlock_bh(&bond->lock);
553 }
554
555 static void bond_del_vlans_from_slave(struct bonding *bond,
556                                       struct net_device *slave_dev)
557 {
558         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
559         struct vlan_entry *vlan;
560         struct net_device *vlan_dev;
561
562         write_lock_bh(&bond->lock);
563
564         if (list_empty(&bond->vlan_list))
565                 goto out;
566
567         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
568             !(slave_ops->ndo_vlan_rx_kill_vid))
569                 goto unreg;
570
571         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
572                 /* Save and then restore vlan_dev in the grp array,
573                  * since the slave's driver might clear it.
574                  */
575                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
576                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
577                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
578         }
579
580 unreg:
581         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
582             slave_ops->ndo_vlan_rx_register)
583                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
584
585 out:
586         write_unlock_bh(&bond->lock);
587 }
588
589 /*------------------------------- Link status -------------------------------*/
590
591 /*
592  * Set the carrier state for the master according to the state of its
593  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
594  * do special 802.3ad magic.
595  *
596  * Returns zero if carrier state does not change, nonzero if it does.
597  */
598 static int bond_set_carrier(struct bonding *bond)
599 {
600         struct slave *slave;
601         int i;
602
603         if (bond->slave_cnt == 0)
604                 goto down;
605
606         if (bond->params.mode == BOND_MODE_8023AD)
607                 return bond_3ad_set_carrier(bond);
608
609         bond_for_each_slave(bond, slave, i) {
610                 if (slave->link == BOND_LINK_UP) {
611                         if (!netif_carrier_ok(bond->dev)) {
612                                 netif_carrier_on(bond->dev);
613                                 return 1;
614                         }
615                         return 0;
616                 }
617         }
618
619 down:
620         if (netif_carrier_ok(bond->dev)) {
621                 netif_carrier_off(bond->dev);
622                 return 1;
623         }
624         return 0;
625 }
626
627 /*
628  * Get link speed and duplex from the slave's base driver
629  * using ethtool. If for some reason the call fails or the
630  * values are invalid, fake speed and duplex to 100/Full
631  * and return error.
632  */
633 static int bond_update_speed_duplex(struct slave *slave)
634 {
635         struct net_device *slave_dev = slave->dev;
636         struct ethtool_cmd etool;
637         int res;
638
639         /* Fake speed and duplex */
640         slave->speed = SPEED_100;
641         slave->duplex = DUPLEX_FULL;
642
643         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
644                 return -1;
645
646         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
647         if (res < 0)
648                 return -1;
649
650         switch (etool.speed) {
651         case SPEED_10:
652         case SPEED_100:
653         case SPEED_1000:
654         case SPEED_10000:
655                 break;
656         default:
657                 return -1;
658         }
659
660         switch (etool.duplex) {
661         case DUPLEX_FULL:
662         case DUPLEX_HALF:
663                 break;
664         default:
665                 return -1;
666         }
667
668         slave->speed = etool.speed;
669         slave->duplex = etool.duplex;
670
671         return 0;
672 }
673
674 /*
675  * if <dev> supports MII link status reporting, check its link status.
676  *
677  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
678  * depending upon the setting of the use_carrier parameter.
679  *
680  * Return either BMSR_LSTATUS, meaning that the link is up (or we
681  * can't tell and just pretend it is), or 0, meaning that the link is
682  * down.
683  *
684  * If reporting is non-zero, instead of faking link up, return -1 if
685  * both ETHTOOL and MII ioctls fail (meaning the device does not
686  * support them).  If use_carrier is set, return whatever it says.
687  * It'd be nice if there was a good way to tell if a driver supports
688  * netif_carrier, but there really isn't.
689  */
690 static int bond_check_dev_link(struct bonding *bond,
691                                struct net_device *slave_dev, int reporting)
692 {
693         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
694         static int (*ioctl)(struct net_device *, struct ifreq *, int);
695         struct ifreq ifr;
696         struct mii_ioctl_data *mii;
697
698         if (bond->params.use_carrier)
699                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
700
701         /* Try to get link status using Ethtool first. */
702         if (slave_dev->ethtool_ops) {
703                 if (slave_dev->ethtool_ops->get_link) {
704                         u32 link;
705
706                         link = slave_dev->ethtool_ops->get_link(slave_dev);
707
708                         return link ? BMSR_LSTATUS : 0;
709                 }
710         }
711
712         /* Ethtool can't be used, fallback to MII ioctls. */
713         ioctl = slave_ops->ndo_do_ioctl;
714         if (ioctl) {
715                 /* TODO: set pointer to correct ioctl on a per team member */
716                 /*       bases to make this more efficient. that is, once  */
717                 /*       we determine the correct ioctl, we will always    */
718                 /*       call it and not the others for that team          */
719                 /*       member.                                           */
720
721                 /*
722                  * We cannot assume that SIOCGMIIPHY will also read a
723                  * register; not all network drivers (e.g., e100)
724                  * support that.
725                  */
726
727                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
728                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
729                 mii = if_mii(&ifr);
730                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
731                         mii->reg_num = MII_BMSR;
732                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
733                                 return mii->val_out & BMSR_LSTATUS;
734                 }
735         }
736
737         /*
738          * If reporting, report that either there's no dev->do_ioctl,
739          * or both SIOCGMIIREG and get_link failed (meaning that we
740          * cannot report link status).  If not reporting, pretend
741          * we're ok.
742          */
743         return reporting ? -1 : BMSR_LSTATUS;
744 }
745
746 /*----------------------------- Multicast list ------------------------------*/
747
748 /*
749  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
750  */
751 static inline int bond_is_dmi_same(const struct dev_mc_list *dmi1,
752                                    const struct dev_mc_list *dmi2)
753 {
754         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
755                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
756 }
757
758 /*
759  * returns dmi entry if found, NULL otherwise
760  */
761 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi,
762                                                  struct dev_mc_list *mc_list)
763 {
764         struct dev_mc_list *idmi;
765
766         for (idmi = mc_list; idmi; idmi = idmi->next) {
767                 if (bond_is_dmi_same(dmi, idmi))
768                         return idmi;
769         }
770
771         return NULL;
772 }
773
774 /*
775  * Push the promiscuity flag down to appropriate slaves
776  */
777 static int bond_set_promiscuity(struct bonding *bond, int inc)
778 {
779         int err = 0;
780         if (USES_PRIMARY(bond->params.mode)) {
781                 /* write lock already acquired */
782                 if (bond->curr_active_slave) {
783                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
784                                                   inc);
785                 }
786         } else {
787                 struct slave *slave;
788                 int i;
789                 bond_for_each_slave(bond, slave, i) {
790                         err = dev_set_promiscuity(slave->dev, inc);
791                         if (err)
792                                 return err;
793                 }
794         }
795         return err;
796 }
797
798 /*
799  * Push the allmulti flag down to all slaves
800  */
801 static int bond_set_allmulti(struct bonding *bond, int inc)
802 {
803         int err = 0;
804         if (USES_PRIMARY(bond->params.mode)) {
805                 /* write lock already acquired */
806                 if (bond->curr_active_slave) {
807                         err = dev_set_allmulti(bond->curr_active_slave->dev,
808                                                inc);
809                 }
810         } else {
811                 struct slave *slave;
812                 int i;
813                 bond_for_each_slave(bond, slave, i) {
814                         err = dev_set_allmulti(slave->dev, inc);
815                         if (err)
816                                 return err;
817                 }
818         }
819         return err;
820 }
821
822 /*
823  * Add a Multicast address to slaves
824  * according to mode
825  */
826 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
827 {
828         if (USES_PRIMARY(bond->params.mode)) {
829                 /* write lock already acquired */
830                 if (bond->curr_active_slave)
831                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
832         } else {
833                 struct slave *slave;
834                 int i;
835
836                 bond_for_each_slave(bond, slave, i)
837                         dev_mc_add(slave->dev, addr, alen, 0);
838         }
839 }
840
841 /*
842  * Remove a multicast address from slave
843  * according to mode
844  */
845 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
846 {
847         if (USES_PRIMARY(bond->params.mode)) {
848                 /* write lock already acquired */
849                 if (bond->curr_active_slave)
850                         dev_mc_delete(bond->curr_active_slave->dev, addr,
851                                       alen, 0);
852         } else {
853                 struct slave *slave;
854                 int i;
855                 bond_for_each_slave(bond, slave, i) {
856                         dev_mc_delete(slave->dev, addr, alen, 0);
857                 }
858         }
859 }
860
861
862 /*
863  * Retrieve the list of registered multicast addresses for the bonding
864  * device and retransmit an IGMP JOIN request to the current active
865  * slave.
866  */
867 static void bond_resend_igmp_join_requests(struct bonding *bond)
868 {
869         struct in_device *in_dev;
870         struct ip_mc_list *im;
871
872         rcu_read_lock();
873         in_dev = __in_dev_get_rcu(bond->dev);
874         if (in_dev) {
875                 for (im = in_dev->mc_list; im; im = im->next)
876                         ip_mc_rejoin_group(im);
877         }
878
879         rcu_read_unlock();
880 }
881
882 /*
883  * Totally destroys the mc_list in bond
884  */
885 static void bond_mc_list_destroy(struct bonding *bond)
886 {
887         struct dev_mc_list *dmi;
888
889         dmi = bond->mc_list;
890         while (dmi) {
891                 bond->mc_list = dmi->next;
892                 kfree(dmi);
893                 dmi = bond->mc_list;
894         }
895
896         bond->mc_list = NULL;
897 }
898
899 /*
900  * Copy all the Multicast addresses from src to the bonding device dst
901  */
902 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
903                              gfp_t gfp_flag)
904 {
905         struct dev_mc_list *dmi, *new_dmi;
906
907         for (dmi = mc_list; dmi; dmi = dmi->next) {
908                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
909
910                 if (!new_dmi) {
911                         /* FIXME: Potential memory leak !!! */
912                         return -ENOMEM;
913                 }
914
915                 new_dmi->next = bond->mc_list;
916                 bond->mc_list = new_dmi;
917                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
918                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
919                 new_dmi->dmi_users = dmi->dmi_users;
920                 new_dmi->dmi_gusers = dmi->dmi_gusers;
921         }
922
923         return 0;
924 }
925
926 /*
927  * flush all members of flush->mc_list from device dev->mc_list
928  */
929 static void bond_mc_list_flush(struct net_device *bond_dev,
930                                struct net_device *slave_dev)
931 {
932         struct bonding *bond = netdev_priv(bond_dev);
933         struct dev_mc_list *dmi;
934
935         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
936                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
937
938         if (bond->params.mode == BOND_MODE_8023AD) {
939                 /* del lacpdu mc addr from mc list */
940                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
941
942                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
943         }
944 }
945
946 /*--------------------------- Active slave change ---------------------------*/
947
948 /*
949  * Update the mc list and multicast-related flags for the new and
950  * old active slaves (if any) according to the multicast mode, and
951  * promiscuous flags unconditionally.
952  */
953 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
954                          struct slave *old_active)
955 {
956         struct dev_mc_list *dmi;
957
958         if (!USES_PRIMARY(bond->params.mode))
959                 /* nothing to do -  mc list is already up-to-date on
960                  * all slaves
961                  */
962                 return;
963
964         if (old_active) {
965                 if (bond->dev->flags & IFF_PROMISC)
966                         dev_set_promiscuity(old_active->dev, -1);
967
968                 if (bond->dev->flags & IFF_ALLMULTI)
969                         dev_set_allmulti(old_active->dev, -1);
970
971                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
972                         dev_mc_delete(old_active->dev, dmi->dmi_addr,
973                                       dmi->dmi_addrlen, 0);
974         }
975
976         if (new_active) {
977                 /* FIXME: Signal errors upstream. */
978                 if (bond->dev->flags & IFF_PROMISC)
979                         dev_set_promiscuity(new_active->dev, 1);
980
981                 if (bond->dev->flags & IFF_ALLMULTI)
982                         dev_set_allmulti(new_active->dev, 1);
983
984                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
985                         dev_mc_add(new_active->dev, dmi->dmi_addr,
986                                    dmi->dmi_addrlen, 0);
987                 bond_resend_igmp_join_requests(bond);
988         }
989 }
990
991 /*
992  * bond_do_fail_over_mac
993  *
994  * Perform special MAC address swapping for fail_over_mac settings
995  *
996  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
997  */
998 static void bond_do_fail_over_mac(struct bonding *bond,
999                                   struct slave *new_active,
1000                                   struct slave *old_active)
1001         __releases(&bond->curr_slave_lock)
1002         __releases(&bond->lock)
1003         __acquires(&bond->lock)
1004         __acquires(&bond->curr_slave_lock)
1005 {
1006         u8 tmp_mac[ETH_ALEN];
1007         struct sockaddr saddr;
1008         int rv;
1009
1010         switch (bond->params.fail_over_mac) {
1011         case BOND_FOM_ACTIVE:
1012                 if (new_active)
1013                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1014                                new_active->dev->addr_len);
1015                 break;
1016         case BOND_FOM_FOLLOW:
1017                 /*
1018                  * if new_active && old_active, swap them
1019                  * if just old_active, do nothing (going to no active slave)
1020                  * if just new_active, set new_active to bond's MAC
1021                  */
1022                 if (!new_active)
1023                         return;
1024
1025                 write_unlock_bh(&bond->curr_slave_lock);
1026                 read_unlock(&bond->lock);
1027
1028                 if (old_active) {
1029                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1030                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1031                                ETH_ALEN);
1032                         saddr.sa_family = new_active->dev->type;
1033                 } else {
1034                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1035                         saddr.sa_family = bond->dev->type;
1036                 }
1037
1038                 rv = dev_set_mac_address(new_active->dev, &saddr);
1039                 if (rv) {
1040                         pr_err(DRV_NAME
1041                                ": %s: Error %d setting MAC of slave %s\n",
1042                                bond->dev->name, -rv, new_active->dev->name);
1043                         goto out;
1044                 }
1045
1046                 if (!old_active)
1047                         goto out;
1048
1049                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1050                 saddr.sa_family = old_active->dev->type;
1051
1052                 rv = dev_set_mac_address(old_active->dev, &saddr);
1053                 if (rv)
1054                         pr_err(DRV_NAME
1055                                ": %s: Error %d setting MAC of slave %s\n",
1056                                bond->dev->name, -rv, new_active->dev->name);
1057 out:
1058                 read_lock(&bond->lock);
1059                 write_lock_bh(&bond->curr_slave_lock);
1060                 break;
1061         default:
1062                 pr_err(DRV_NAME
1063                        ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1064                        bond->dev->name, bond->params.fail_over_mac);
1065                 break;
1066         }
1067
1068 }
1069
1070
1071 /**
1072  * find_best_interface - select the best available slave to be the active one
1073  * @bond: our bonding struct
1074  *
1075  * Warning: Caller must hold curr_slave_lock for writing.
1076  */
1077 static struct slave *bond_find_best_slave(struct bonding *bond)
1078 {
1079         struct slave *new_active, *old_active;
1080         struct slave *bestslave = NULL;
1081         int mintime = bond->params.updelay;
1082         int i;
1083
1084         new_active = old_active = bond->curr_active_slave;
1085
1086         if (!new_active) { /* there were no active slaves left */
1087                 if (bond->slave_cnt > 0)   /* found one slave */
1088                         new_active = bond->first_slave;
1089                 else
1090                         return NULL; /* still no slave, return NULL */
1091         }
1092
1093         /*
1094          * first try the primary link; if arping, a link must tx/rx
1095          * traffic before it can be considered the curr_active_slave.
1096          * also, we would skip slaves between the curr_active_slave
1097          * and primary_slave that may be up and able to arp
1098          */
1099         if ((bond->primary_slave) &&
1100             (!bond->params.arp_interval) &&
1101             (IS_UP(bond->primary_slave->dev))) {
1102                 new_active = bond->primary_slave;
1103         }
1104
1105         /* remember where to stop iterating over the slaves */
1106         old_active = new_active;
1107
1108         bond_for_each_slave_from(bond, new_active, i, old_active) {
1109                 if (IS_UP(new_active->dev)) {
1110                         if (new_active->link == BOND_LINK_UP) {
1111                                 return new_active;
1112                         } else if (new_active->link == BOND_LINK_BACK) {
1113                                 /* link up, but waiting for stabilization */
1114                                 if (new_active->delay < mintime) {
1115                                         mintime = new_active->delay;
1116                                         bestslave = new_active;
1117                                 }
1118                         }
1119                 }
1120         }
1121
1122         return bestslave;
1123 }
1124
1125 /**
1126  * change_active_interface - change the active slave into the specified one
1127  * @bond: our bonding struct
1128  * @new: the new slave to make the active one
1129  *
1130  * Set the new slave to the bond's settings and unset them on the old
1131  * curr_active_slave.
1132  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1133  *
1134  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1135  * because it is apparently the best available slave we have, even though its
1136  * updelay hasn't timed out yet.
1137  *
1138  * If new_active is not NULL, caller must hold bond->lock for read and
1139  * curr_slave_lock for write_bh.
1140  */
1141 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1142 {
1143         struct slave *old_active = bond->curr_active_slave;
1144
1145         if (old_active == new_active)
1146                 return;
1147
1148         if (new_active) {
1149                 new_active->jiffies = jiffies;
1150
1151                 if (new_active->link == BOND_LINK_BACK) {
1152                         if (USES_PRIMARY(bond->params.mode)) {
1153                                 pr_info(DRV_NAME
1154                                        ": %s: making interface %s the new "
1155                                        "active one %d ms earlier.\n",
1156                                        bond->dev->name, new_active->dev->name,
1157                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1158                         }
1159
1160                         new_active->delay = 0;
1161                         new_active->link = BOND_LINK_UP;
1162
1163                         if (bond->params.mode == BOND_MODE_8023AD)
1164                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1165
1166                         if (bond_is_lb(bond))
1167                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1168                 } else {
1169                         if (USES_PRIMARY(bond->params.mode)) {
1170                                 pr_info(DRV_NAME
1171                                        ": %s: making interface %s the new "
1172                                        "active one.\n",
1173                                        bond->dev->name, new_active->dev->name);
1174                         }
1175                 }
1176         }
1177
1178         if (USES_PRIMARY(bond->params.mode))
1179                 bond_mc_swap(bond, new_active, old_active);
1180
1181         if (bond_is_lb(bond)) {
1182                 bond_alb_handle_active_change(bond, new_active);
1183                 if (old_active)
1184                         bond_set_slave_inactive_flags(old_active);
1185                 if (new_active)
1186                         bond_set_slave_active_flags(new_active);
1187         } else {
1188                 bond->curr_active_slave = new_active;
1189         }
1190
1191         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1192                 if (old_active)
1193                         bond_set_slave_inactive_flags(old_active);
1194
1195                 if (new_active) {
1196                         bond_set_slave_active_flags(new_active);
1197
1198                         if (bond->params.fail_over_mac)
1199                                 bond_do_fail_over_mac(bond, new_active,
1200                                                       old_active);
1201
1202                         bond->send_grat_arp = bond->params.num_grat_arp;
1203                         bond_send_gratuitous_arp(bond);
1204
1205                         bond->send_unsol_na = bond->params.num_unsol_na;
1206                         bond_send_unsolicited_na(bond);
1207
1208                         write_unlock_bh(&bond->curr_slave_lock);
1209                         read_unlock(&bond->lock);
1210
1211                         netdev_bonding_change(bond->dev);
1212
1213                         read_lock(&bond->lock);
1214                         write_lock_bh(&bond->curr_slave_lock);
1215                 }
1216         }
1217 }
1218
1219 /**
1220  * bond_select_active_slave - select a new active slave, if needed
1221  * @bond: our bonding struct
1222  *
1223  * This functions should be called when one of the following occurs:
1224  * - The old curr_active_slave has been released or lost its link.
1225  * - The primary_slave has got its link back.
1226  * - A slave has got its link back and there's no old curr_active_slave.
1227  *
1228  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1229  */
1230 void bond_select_active_slave(struct bonding *bond)
1231 {
1232         struct slave *best_slave;
1233         int rv;
1234
1235         best_slave = bond_find_best_slave(bond);
1236         if (best_slave != bond->curr_active_slave) {
1237                 bond_change_active_slave(bond, best_slave);
1238                 rv = bond_set_carrier(bond);
1239                 if (!rv)
1240                         return;
1241
1242                 if (netif_carrier_ok(bond->dev)) {
1243                         pr_info(DRV_NAME
1244                                ": %s: first active interface up!\n",
1245                                bond->dev->name);
1246                 } else {
1247                         pr_info(DRV_NAME ": %s: "
1248                                "now running without any active interface !\n",
1249                                bond->dev->name);
1250                 }
1251         }
1252 }
1253
1254 /*--------------------------- slave list handling ---------------------------*/
1255
1256 /*
1257  * This function attaches the slave to the end of list.
1258  *
1259  * bond->lock held for writing by caller.
1260  */
1261 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1262 {
1263         if (bond->first_slave == NULL) { /* attaching the first slave */
1264                 new_slave->next = new_slave;
1265                 new_slave->prev = new_slave;
1266                 bond->first_slave = new_slave;
1267         } else {
1268                 new_slave->next = bond->first_slave;
1269                 new_slave->prev = bond->first_slave->prev;
1270                 new_slave->next->prev = new_slave;
1271                 new_slave->prev->next = new_slave;
1272         }
1273
1274         bond->slave_cnt++;
1275 }
1276
1277 /*
1278  * This function detaches the slave from the list.
1279  * WARNING: no check is made to verify if the slave effectively
1280  * belongs to <bond>.
1281  * Nothing is freed on return, structures are just unchained.
1282  * If any slave pointer in bond was pointing to <slave>,
1283  * it should be changed by the calling function.
1284  *
1285  * bond->lock held for writing by caller.
1286  */
1287 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1288 {
1289         if (slave->next)
1290                 slave->next->prev = slave->prev;
1291
1292         if (slave->prev)
1293                 slave->prev->next = slave->next;
1294
1295         if (bond->first_slave == slave) { /* slave is the first slave */
1296                 if (bond->slave_cnt > 1) { /* there are more slave */
1297                         bond->first_slave = slave->next;
1298                 } else {
1299                         bond->first_slave = NULL; /* slave was the last one */
1300                 }
1301         }
1302
1303         slave->next = NULL;
1304         slave->prev = NULL;
1305         bond->slave_cnt--;
1306 }
1307
1308 /*---------------------------------- IOCTL ----------------------------------*/
1309
1310 static int bond_sethwaddr(struct net_device *bond_dev,
1311                           struct net_device *slave_dev)
1312 {
1313         pr_debug("bond_dev=%p\n", bond_dev);
1314         pr_debug("slave_dev=%p\n", slave_dev);
1315         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1316         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1317         return 0;
1318 }
1319
1320 #define BOND_VLAN_FEATURES \
1321         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1322          NETIF_F_HW_VLAN_FILTER)
1323
1324 /*
1325  * Compute the common dev->feature set available to all slaves.  Some
1326  * feature bits are managed elsewhere, so preserve those feature bits
1327  * on the master device.
1328  */
1329 static int bond_compute_features(struct bonding *bond)
1330 {
1331         struct slave *slave;
1332         struct net_device *bond_dev = bond->dev;
1333         unsigned long features = bond_dev->features;
1334         unsigned long vlan_features = 0;
1335         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1336                                                 bond_dev->hard_header_len);
1337         int i;
1338
1339         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1340         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1341
1342         if (!bond->first_slave)
1343                 goto done;
1344
1345         features &= ~NETIF_F_ONE_FOR_ALL;
1346
1347         vlan_features = bond->first_slave->dev->vlan_features;
1348         bond_for_each_slave(bond, slave, i) {
1349                 features = netdev_increment_features(features,
1350                                                      slave->dev->features,
1351                                                      NETIF_F_ONE_FOR_ALL);
1352                 vlan_features = netdev_increment_features(vlan_features,
1353                                                         slave->dev->vlan_features,
1354                                                         NETIF_F_ONE_FOR_ALL);
1355                 if (slave->dev->hard_header_len > max_hard_header_len)
1356                         max_hard_header_len = slave->dev->hard_header_len;
1357         }
1358
1359 done:
1360         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1361         bond_dev->features = netdev_fix_features(features, NULL);
1362         bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1363         bond_dev->hard_header_len = max_hard_header_len;
1364
1365         return 0;
1366 }
1367
1368 static void bond_setup_by_slave(struct net_device *bond_dev,
1369                                 struct net_device *slave_dev)
1370 {
1371         struct bonding *bond = netdev_priv(bond_dev);
1372
1373         bond_dev->header_ops        = slave_dev->header_ops;
1374
1375         bond_dev->type              = slave_dev->type;
1376         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1377         bond_dev->addr_len          = slave_dev->addr_len;
1378
1379         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1380                 slave_dev->addr_len);
1381         bond->setup_by_slave = 1;
1382 }
1383
1384 /* enslave device <slave> to bond device <master> */
1385 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1386 {
1387         struct bonding *bond = netdev_priv(bond_dev);
1388         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1389         struct slave *new_slave = NULL;
1390         struct dev_mc_list *dmi;
1391         struct sockaddr addr;
1392         int link_reporting;
1393         int old_features = bond_dev->features;
1394         int res = 0;
1395
1396         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1397                 slave_ops->ndo_do_ioctl == NULL) {
1398                 pr_warning(DRV_NAME
1399                        ": %s: Warning: no link monitoring support for %s\n",
1400                        bond_dev->name, slave_dev->name);
1401         }
1402
1403         /* bond must be initialized by bond_open() before enslaving */
1404         if (!(bond_dev->flags & IFF_UP)) {
1405                 pr_warning(DRV_NAME
1406                         " %s: master_dev is not up in bond_enslave\n",
1407                         bond_dev->name);
1408         }
1409
1410         /* already enslaved */
1411         if (slave_dev->flags & IFF_SLAVE) {
1412                 pr_debug("Error, Device was already enslaved\n");
1413                 return -EBUSY;
1414         }
1415
1416         /* vlan challenged mutual exclusion */
1417         /* no need to lock since we're protected by rtnl_lock */
1418         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1419                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1420                 if (!list_empty(&bond->vlan_list)) {
1421                         pr_err(DRV_NAME
1422                                ": %s: Error: cannot enslave VLAN "
1423                                "challenged slave %s on VLAN enabled "
1424                                "bond %s\n", bond_dev->name, slave_dev->name,
1425                                bond_dev->name);
1426                         return -EPERM;
1427                 } else {
1428                         pr_warning(DRV_NAME
1429                                ": %s: Warning: enslaved VLAN challenged "
1430                                "slave %s. Adding VLANs will be blocked as "
1431                                "long as %s is part of bond %s\n",
1432                                bond_dev->name, slave_dev->name, slave_dev->name,
1433                                bond_dev->name);
1434                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1435                 }
1436         } else {
1437                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1438                 if (bond->slave_cnt == 0) {
1439                         /* First slave, and it is not VLAN challenged,
1440                          * so remove the block of adding VLANs over the bond.
1441                          */
1442                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1443                 }
1444         }
1445
1446         /*
1447          * Old ifenslave binaries are no longer supported.  These can
1448          * be identified with moderate accuracy by the state of the slave:
1449          * the current ifenslave will set the interface down prior to
1450          * enslaving it; the old ifenslave will not.
1451          */
1452         if ((slave_dev->flags & IFF_UP)) {
1453                 pr_err(DRV_NAME ": %s is up. "
1454                        "This may be due to an out of date ifenslave.\n",
1455                        slave_dev->name);
1456                 res = -EPERM;
1457                 goto err_undo_flags;
1458         }
1459
1460         /* set bonding device ether type by slave - bonding netdevices are
1461          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1462          * there is a need to override some of the type dependent attribs/funcs.
1463          *
1464          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1465          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1466          */
1467         if (bond->slave_cnt == 0) {
1468                 if (bond_dev->type != slave_dev->type) {
1469                         dev_close(bond_dev);
1470                         pr_debug("%s: change device type from %d to %d\n",
1471                                 bond_dev->name, bond_dev->type, slave_dev->type);
1472                         if (slave_dev->type != ARPHRD_ETHER)
1473                                 bond_setup_by_slave(bond_dev, slave_dev);
1474                         else
1475                                 ether_setup(bond_dev);
1476                         dev_open(bond_dev);
1477                 }
1478         } else if (bond_dev->type != slave_dev->type) {
1479                 pr_err(DRV_NAME ": %s ether type (%d) is different "
1480                         "from other slaves (%d), can not enslave it.\n",
1481                         slave_dev->name,
1482                         slave_dev->type, bond_dev->type);
1483                         res = -EINVAL;
1484                         goto err_undo_flags;
1485         }
1486
1487         if (slave_ops->ndo_set_mac_address == NULL) {
1488                 if (bond->slave_cnt == 0) {
1489                         pr_warning(DRV_NAME
1490                                ": %s: Warning: The first slave device "
1491                                "specified does not support setting the MAC "
1492                                "address. Setting fail_over_mac to active.",
1493                                bond_dev->name);
1494                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1495                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1496                         pr_err(DRV_NAME
1497                                 ": %s: Error: The slave device specified "
1498                                 "does not support setting the MAC address, "
1499                                 "but fail_over_mac is not set to active.\n"
1500                                 , bond_dev->name);
1501                         res = -EOPNOTSUPP;
1502                         goto err_undo_flags;
1503                 }
1504         }
1505
1506         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1507         if (!new_slave) {
1508                 res = -ENOMEM;
1509                 goto err_undo_flags;
1510         }
1511
1512         /* save slave's original flags before calling
1513          * netdev_set_master and dev_open
1514          */
1515         new_slave->original_flags = slave_dev->flags;
1516
1517         /*
1518          * Save slave's original ("permanent") mac address for modes
1519          * that need it, and for restoring it upon release, and then
1520          * set it to the master's address
1521          */
1522         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1523
1524         if (!bond->params.fail_over_mac) {
1525                 /*
1526                  * Set slave to master's mac address.  The application already
1527                  * set the master's mac address to that of the first slave
1528                  */
1529                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1530                 addr.sa_family = slave_dev->type;
1531                 res = dev_set_mac_address(slave_dev, &addr);
1532                 if (res) {
1533                         pr_debug("Error %d calling set_mac_address\n", res);
1534                         goto err_free;
1535                 }
1536         }
1537
1538         res = netdev_set_master(slave_dev, bond_dev);
1539         if (res) {
1540                 pr_debug("Error %d calling netdev_set_master\n", res);
1541                 goto err_restore_mac;
1542         }
1543         /* open the slave since the application closed it */
1544         res = dev_open(slave_dev);
1545         if (res) {
1546                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1547                 goto err_unset_master;
1548         }
1549
1550         new_slave->dev = slave_dev;
1551         slave_dev->priv_flags |= IFF_BONDING;
1552
1553         if (bond_is_lb(bond)) {
1554                 /* bond_alb_init_slave() must be called before all other stages since
1555                  * it might fail and we do not want to have to undo everything
1556                  */
1557                 res = bond_alb_init_slave(bond, new_slave);
1558                 if (res)
1559                         goto err_close;
1560         }
1561
1562         /* If the mode USES_PRIMARY, then the new slave gets the
1563          * master's promisc (and mc) settings only if it becomes the
1564          * curr_active_slave, and that is taken care of later when calling
1565          * bond_change_active()
1566          */
1567         if (!USES_PRIMARY(bond->params.mode)) {
1568                 /* set promiscuity level to new slave */
1569                 if (bond_dev->flags & IFF_PROMISC) {
1570                         res = dev_set_promiscuity(slave_dev, 1);
1571                         if (res)
1572                                 goto err_close;
1573                 }
1574
1575                 /* set allmulti level to new slave */
1576                 if (bond_dev->flags & IFF_ALLMULTI) {
1577                         res = dev_set_allmulti(slave_dev, 1);
1578                         if (res)
1579                                 goto err_close;
1580                 }
1581
1582                 netif_addr_lock_bh(bond_dev);
1583                 /* upload master's mc_list to new slave */
1584                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
1585                         dev_mc_add(slave_dev, dmi->dmi_addr,
1586                                    dmi->dmi_addrlen, 0);
1587                 netif_addr_unlock_bh(bond_dev);
1588         }
1589
1590         if (bond->params.mode == BOND_MODE_8023AD) {
1591                 /* add lacpdu mc addr to mc list */
1592                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1593
1594                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1595         }
1596
1597         bond_add_vlans_on_slave(bond, slave_dev);
1598
1599         write_lock_bh(&bond->lock);
1600
1601         bond_attach_slave(bond, new_slave);
1602
1603         new_slave->delay = 0;
1604         new_slave->link_failure_count = 0;
1605
1606         bond_compute_features(bond);
1607
1608         write_unlock_bh(&bond->lock);
1609
1610         read_lock(&bond->lock);
1611
1612         new_slave->last_arp_rx = jiffies;
1613
1614         if (bond->params.miimon && !bond->params.use_carrier) {
1615                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1616
1617                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1618                         /*
1619                          * miimon is set but a bonded network driver
1620                          * does not support ETHTOOL/MII and
1621                          * arp_interval is not set.  Note: if
1622                          * use_carrier is enabled, we will never go
1623                          * here (because netif_carrier is always
1624                          * supported); thus, we don't need to change
1625                          * the messages for netif_carrier.
1626                          */
1627                         pr_warning(DRV_NAME
1628                                ": %s: Warning: MII and ETHTOOL support not "
1629                                "available for interface %s, and "
1630                                "arp_interval/arp_ip_target module parameters "
1631                                "not specified, thus bonding will not detect "
1632                                "link failures! see bonding.txt for details.\n",
1633                                bond_dev->name, slave_dev->name);
1634                 } else if (link_reporting == -1) {
1635                         /* unable get link status using mii/ethtool */
1636                         pr_warning(DRV_NAME
1637                                ": %s: Warning: can't get link status from "
1638                                "interface %s; the network driver associated "
1639                                "with this interface does not support MII or "
1640                                "ETHTOOL link status reporting, thus miimon "
1641                                "has no effect on this interface.\n",
1642                                bond_dev->name, slave_dev->name);
1643                 }
1644         }
1645
1646         /* check for initial state */
1647         if (!bond->params.miimon ||
1648             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1649                 if (bond->params.updelay) {
1650                         pr_debug("Initial state of slave_dev is "
1651                                 "BOND_LINK_BACK\n");
1652                         new_slave->link  = BOND_LINK_BACK;
1653                         new_slave->delay = bond->params.updelay;
1654                 } else {
1655                         pr_debug("Initial state of slave_dev is "
1656                                 "BOND_LINK_UP\n");
1657                         new_slave->link  = BOND_LINK_UP;
1658                 }
1659                 new_slave->jiffies = jiffies;
1660         } else {
1661                 pr_debug("Initial state of slave_dev is "
1662                         "BOND_LINK_DOWN\n");
1663                 new_slave->link  = BOND_LINK_DOWN;
1664         }
1665
1666         if (bond_update_speed_duplex(new_slave) &&
1667             (new_slave->link != BOND_LINK_DOWN)) {
1668                 pr_warning(DRV_NAME
1669                        ": %s: Warning: failed to get speed and duplex from %s, "
1670                        "assumed to be 100Mb/sec and Full.\n",
1671                        bond_dev->name, new_slave->dev->name);
1672
1673                 if (bond->params.mode == BOND_MODE_8023AD) {
1674                         pr_warning(DRV_NAME
1675                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1676                                "support in base driver for proper aggregator "
1677                                "selection.\n", bond_dev->name);
1678                 }
1679         }
1680
1681         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1682                 /* if there is a primary slave, remember it */
1683                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0)
1684                         bond->primary_slave = new_slave;
1685         }
1686
1687         write_lock_bh(&bond->curr_slave_lock);
1688
1689         switch (bond->params.mode) {
1690         case BOND_MODE_ACTIVEBACKUP:
1691                 bond_set_slave_inactive_flags(new_slave);
1692                 bond_select_active_slave(bond);
1693                 break;
1694         case BOND_MODE_8023AD:
1695                 /* in 802.3ad mode, the internal mechanism
1696                  * will activate the slaves in the selected
1697                  * aggregator
1698                  */
1699                 bond_set_slave_inactive_flags(new_slave);
1700                 /* if this is the first slave */
1701                 if (bond->slave_cnt == 1) {
1702                         SLAVE_AD_INFO(new_slave).id = 1;
1703                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1704                          * can be called only after the mac address of the bond is set
1705                          */
1706                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1707                                             bond->params.lacp_fast);
1708                 } else {
1709                         SLAVE_AD_INFO(new_slave).id =
1710                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1711                 }
1712
1713                 bond_3ad_bind_slave(new_slave);
1714                 break;
1715         case BOND_MODE_TLB:
1716         case BOND_MODE_ALB:
1717                 new_slave->state = BOND_STATE_ACTIVE;
1718                 bond_set_slave_inactive_flags(new_slave);
1719                 bond_select_active_slave(bond);
1720                 break;
1721         default:
1722                 pr_debug("This slave is always active in trunk mode\n");
1723
1724                 /* always active in trunk mode */
1725                 new_slave->state = BOND_STATE_ACTIVE;
1726
1727                 /* In trunking mode there is little meaning to curr_active_slave
1728                  * anyway (it holds no special properties of the bond device),
1729                  * so we can change it without calling change_active_interface()
1730                  */
1731                 if (!bond->curr_active_slave)
1732                         bond->curr_active_slave = new_slave;
1733
1734                 break;
1735         } /* switch(bond_mode) */
1736
1737         write_unlock_bh(&bond->curr_slave_lock);
1738
1739         bond_set_carrier(bond);
1740
1741         read_unlock(&bond->lock);
1742
1743         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1744         if (res)
1745                 goto err_close;
1746
1747         pr_info(DRV_NAME
1748                ": %s: enslaving %s as a%s interface with a%s link.\n",
1749                bond_dev->name, slave_dev->name,
1750                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1751                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1752
1753         /* enslave is successful */
1754         return 0;
1755
1756 /* Undo stages on error */
1757 err_close:
1758         dev_close(slave_dev);
1759
1760 err_unset_master:
1761         netdev_set_master(slave_dev, NULL);
1762
1763 err_restore_mac:
1764         if (!bond->params.fail_over_mac) {
1765                 /* XXX TODO - fom follow mode needs to change master's
1766                  * MAC if this slave's MAC is in use by the bond, or at
1767                  * least print a warning.
1768                  */
1769                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1770                 addr.sa_family = slave_dev->type;
1771                 dev_set_mac_address(slave_dev, &addr);
1772         }
1773
1774 err_free:
1775         kfree(new_slave);
1776
1777 err_undo_flags:
1778         bond_dev->features = old_features;
1779
1780         return res;
1781 }
1782
1783 /*
1784  * Try to release the slave device <slave> from the bond device <master>
1785  * It is legal to access curr_active_slave without a lock because all the function
1786  * is write-locked.
1787  *
1788  * The rules for slave state should be:
1789  *   for Active/Backup:
1790  *     Active stays on all backups go down
1791  *   for Bonded connections:
1792  *     The first up interface should be left on and all others downed.
1793  */
1794 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1795 {
1796         struct bonding *bond = netdev_priv(bond_dev);
1797         struct slave *slave, *oldcurrent;
1798         struct sockaddr addr;
1799
1800         /* slave is not a slave or master is not master of this slave */
1801         if (!(slave_dev->flags & IFF_SLAVE) ||
1802             (slave_dev->master != bond_dev)) {
1803                 pr_err(DRV_NAME
1804                        ": %s: Error: cannot release %s.\n",
1805                        bond_dev->name, slave_dev->name);
1806                 return -EINVAL;
1807         }
1808
1809         write_lock_bh(&bond->lock);
1810
1811         slave = bond_get_slave_by_dev(bond, slave_dev);
1812         if (!slave) {
1813                 /* not a slave of this bond */
1814                 pr_info(DRV_NAME
1815                        ": %s: %s not enslaved\n",
1816                        bond_dev->name, slave_dev->name);
1817                 write_unlock_bh(&bond->lock);
1818                 return -EINVAL;
1819         }
1820
1821         if (!bond->params.fail_over_mac) {
1822                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr)
1823                     && bond->slave_cnt > 1)
1824                         pr_warning(DRV_NAME
1825                                ": %s: Warning: the permanent HWaddr of %s - "
1826                                "%pM - is still in use by %s. "
1827                                "Set the HWaddr of %s to a different address "
1828                                "to avoid conflicts.\n",
1829                                bond_dev->name, slave_dev->name,
1830                                slave->perm_hwaddr,
1831                                bond_dev->name, slave_dev->name);
1832         }
1833
1834         /* Inform AD package of unbinding of slave. */
1835         if (bond->params.mode == BOND_MODE_8023AD) {
1836                 /* must be called before the slave is
1837                  * detached from the list
1838                  */
1839                 bond_3ad_unbind_slave(slave);
1840         }
1841
1842         pr_info(DRV_NAME
1843                ": %s: releasing %s interface %s\n",
1844                bond_dev->name,
1845                (slave->state == BOND_STATE_ACTIVE)
1846                ? "active" : "backup",
1847                slave_dev->name);
1848
1849         oldcurrent = bond->curr_active_slave;
1850
1851         bond->current_arp_slave = NULL;
1852
1853         /* release the slave from its bond */
1854         bond_detach_slave(bond, slave);
1855
1856         bond_compute_features(bond);
1857
1858         if (bond->primary_slave == slave)
1859                 bond->primary_slave = NULL;
1860
1861         if (oldcurrent == slave)
1862                 bond_change_active_slave(bond, NULL);
1863
1864         if (bond_is_lb(bond)) {
1865                 /* Must be called only after the slave has been
1866                  * detached from the list and the curr_active_slave
1867                  * has been cleared (if our_slave == old_current),
1868                  * but before a new active slave is selected.
1869                  */
1870                 write_unlock_bh(&bond->lock);
1871                 bond_alb_deinit_slave(bond, slave);
1872                 write_lock_bh(&bond->lock);
1873         }
1874
1875         if (oldcurrent == slave) {
1876                 /*
1877                  * Note that we hold RTNL over this sequence, so there
1878                  * is no concern that another slave add/remove event
1879                  * will interfere.
1880                  */
1881                 write_unlock_bh(&bond->lock);
1882                 read_lock(&bond->lock);
1883                 write_lock_bh(&bond->curr_slave_lock);
1884
1885                 bond_select_active_slave(bond);
1886
1887                 write_unlock_bh(&bond->curr_slave_lock);
1888                 read_unlock(&bond->lock);
1889                 write_lock_bh(&bond->lock);
1890         }
1891
1892         if (bond->slave_cnt == 0) {
1893                 bond_set_carrier(bond);
1894
1895                 /* if the last slave was removed, zero the mac address
1896                  * of the master so it will be set by the application
1897                  * to the mac address of the first slave
1898                  */
1899                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1900
1901                 if (list_empty(&bond->vlan_list)) {
1902                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1903                 } else {
1904                         pr_warning(DRV_NAME
1905                                ": %s: Warning: clearing HW address of %s while it "
1906                                "still has VLANs.\n",
1907                                bond_dev->name, bond_dev->name);
1908                         pr_warning(DRV_NAME
1909                                ": %s: When re-adding slaves, make sure the bond's "
1910                                "HW address matches its VLANs'.\n",
1911                                bond_dev->name);
1912                 }
1913         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1914                    !bond_has_challenged_slaves(bond)) {
1915                 pr_info(DRV_NAME
1916                        ": %s: last VLAN challenged slave %s "
1917                        "left bond %s. VLAN blocking is removed\n",
1918                        bond_dev->name, slave_dev->name, bond_dev->name);
1919                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1920         }
1921
1922         write_unlock_bh(&bond->lock);
1923
1924         /* must do this from outside any spinlocks */
1925         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1926
1927         bond_del_vlans_from_slave(bond, slave_dev);
1928
1929         /* If the mode USES_PRIMARY, then we should only remove its
1930          * promisc and mc settings if it was the curr_active_slave, but that was
1931          * already taken care of above when we detached the slave
1932          */
1933         if (!USES_PRIMARY(bond->params.mode)) {
1934                 /* unset promiscuity level from slave */
1935                 if (bond_dev->flags & IFF_PROMISC)
1936                         dev_set_promiscuity(slave_dev, -1);
1937
1938                 /* unset allmulti level from slave */
1939                 if (bond_dev->flags & IFF_ALLMULTI)
1940                         dev_set_allmulti(slave_dev, -1);
1941
1942                 /* flush master's mc_list from slave */
1943                 netif_addr_lock_bh(bond_dev);
1944                 bond_mc_list_flush(bond_dev, slave_dev);
1945                 netif_addr_unlock_bh(bond_dev);
1946         }
1947
1948         netdev_set_master(slave_dev, NULL);
1949
1950         /* close slave before restoring its mac address */
1951         dev_close(slave_dev);
1952
1953         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1954                 /* restore original ("permanent") mac address */
1955                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1956                 addr.sa_family = slave_dev->type;
1957                 dev_set_mac_address(slave_dev, &addr);
1958         }
1959
1960         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1961                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1962                                    IFF_SLAVE_NEEDARP);
1963
1964         kfree(slave);
1965
1966         return 0;  /* deletion OK */
1967 }
1968
1969 /*
1970 * Destroy a bonding device.
1971 * Must be under rtnl_lock when this function is called.
1972 */
1973 static void bond_uninit(struct net_device *bond_dev)
1974 {
1975         struct bonding *bond = netdev_priv(bond_dev);
1976
1977         bond_deinit(bond_dev);
1978         bond_destroy_sysfs_entry(bond);
1979
1980         if (bond->wq)
1981                 destroy_workqueue(bond->wq);
1982
1983         netif_addr_lock_bh(bond_dev);
1984         bond_mc_list_destroy(bond);
1985         netif_addr_unlock_bh(bond_dev);
1986 }
1987
1988 /*
1989 * First release a slave and than destroy the bond if no more slaves are left.
1990 * Must be under rtnl_lock when this function is called.
1991 */
1992 int  bond_release_and_destroy(struct net_device *bond_dev,
1993                               struct net_device *slave_dev)
1994 {
1995         struct bonding *bond = netdev_priv(bond_dev);
1996         int ret;
1997
1998         ret = bond_release(bond_dev, slave_dev);
1999         if ((ret == 0) && (bond->slave_cnt == 0)) {
2000                 pr_info(DRV_NAME ": %s: destroying bond %s.\n",
2001                        bond_dev->name, bond_dev->name);
2002                 unregister_netdevice(bond_dev);
2003         }
2004         return ret;
2005 }
2006
2007 /*
2008  * This function releases all slaves.
2009  */
2010 static int bond_release_all(struct net_device *bond_dev)
2011 {
2012         struct bonding *bond = netdev_priv(bond_dev);
2013         struct slave *slave;
2014         struct net_device *slave_dev;
2015         struct sockaddr addr;
2016
2017         write_lock_bh(&bond->lock);
2018
2019         netif_carrier_off(bond_dev);
2020
2021         if (bond->slave_cnt == 0)
2022                 goto out;
2023
2024         bond->current_arp_slave = NULL;
2025         bond->primary_slave = NULL;
2026         bond_change_active_slave(bond, NULL);
2027
2028         while ((slave = bond->first_slave) != NULL) {
2029                 /* Inform AD package of unbinding of slave
2030                  * before slave is detached from the list.
2031                  */
2032                 if (bond->params.mode == BOND_MODE_8023AD)
2033                         bond_3ad_unbind_slave(slave);
2034
2035                 slave_dev = slave->dev;
2036                 bond_detach_slave(bond, slave);
2037
2038                 /* now that the slave is detached, unlock and perform
2039                  * all the undo steps that should not be called from
2040                  * within a lock.
2041                  */
2042                 write_unlock_bh(&bond->lock);
2043
2044                 if (bond_is_lb(bond)) {
2045                         /* must be called only after the slave
2046                          * has been detached from the list
2047                          */
2048                         bond_alb_deinit_slave(bond, slave);
2049                 }
2050
2051                 bond_compute_features(bond);
2052
2053                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2054                 bond_del_vlans_from_slave(bond, slave_dev);
2055
2056                 /* If the mode USES_PRIMARY, then we should only remove its
2057                  * promisc and mc settings if it was the curr_active_slave, but that was
2058                  * already taken care of above when we detached the slave
2059                  */
2060                 if (!USES_PRIMARY(bond->params.mode)) {
2061                         /* unset promiscuity level from slave */
2062                         if (bond_dev->flags & IFF_PROMISC)
2063                                 dev_set_promiscuity(slave_dev, -1);
2064
2065                         /* unset allmulti level from slave */
2066                         if (bond_dev->flags & IFF_ALLMULTI)
2067                                 dev_set_allmulti(slave_dev, -1);
2068
2069                         /* flush master's mc_list from slave */
2070                         netif_addr_lock_bh(bond_dev);
2071                         bond_mc_list_flush(bond_dev, slave_dev);
2072                         netif_addr_unlock_bh(bond_dev);
2073                 }
2074
2075                 netdev_set_master(slave_dev, NULL);
2076
2077                 /* close slave before restoring its mac address */
2078                 dev_close(slave_dev);
2079
2080                 if (!bond->params.fail_over_mac) {
2081                         /* restore original ("permanent") mac address*/
2082                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2083                         addr.sa_family = slave_dev->type;
2084                         dev_set_mac_address(slave_dev, &addr);
2085                 }
2086
2087                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2088                                            IFF_SLAVE_INACTIVE);
2089
2090                 kfree(slave);
2091
2092                 /* re-acquire the lock before getting the next slave */
2093                 write_lock_bh(&bond->lock);
2094         }
2095
2096         /* zero the mac address of the master so it will be
2097          * set by the application to the mac address of the
2098          * first slave
2099          */
2100         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2101
2102         if (list_empty(&bond->vlan_list))
2103                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2104         else {
2105                 pr_warning(DRV_NAME
2106                        ": %s: Warning: clearing HW address of %s while it "
2107                        "still has VLANs.\n",
2108                        bond_dev->name, bond_dev->name);
2109                 pr_warning(DRV_NAME
2110                        ": %s: When re-adding slaves, make sure the bond's "
2111                        "HW address matches its VLANs'.\n",
2112                        bond_dev->name);
2113         }
2114
2115         pr_info(DRV_NAME
2116                ": %s: released all slaves\n",
2117                bond_dev->name);
2118
2119 out:
2120         write_unlock_bh(&bond->lock);
2121
2122         return 0;
2123 }
2124
2125 /*
2126  * This function changes the active slave to slave <slave_dev>.
2127  * It returns -EINVAL in the following cases.
2128  *  - <slave_dev> is not found in the list.
2129  *  - There is not active slave now.
2130  *  - <slave_dev> is already active.
2131  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2132  *  - <slave_dev> is not running.
2133  * In these cases, this function does nothing.
2134  * In the other cases, current_slave pointer is changed and 0 is returned.
2135  */
2136 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2137 {
2138         struct bonding *bond = netdev_priv(bond_dev);
2139         struct slave *old_active = NULL;
2140         struct slave *new_active = NULL;
2141         int res = 0;
2142
2143         if (!USES_PRIMARY(bond->params.mode))
2144                 return -EINVAL;
2145
2146         /* Verify that master_dev is indeed the master of slave_dev */
2147         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2148                 return -EINVAL;
2149
2150         read_lock(&bond->lock);
2151
2152         read_lock(&bond->curr_slave_lock);
2153         old_active = bond->curr_active_slave;
2154         read_unlock(&bond->curr_slave_lock);
2155
2156         new_active = bond_get_slave_by_dev(bond, slave_dev);
2157
2158         /*
2159          * Changing to the current active: do nothing; return success.
2160          */
2161         if (new_active && (new_active == old_active)) {
2162                 read_unlock(&bond->lock);
2163                 return 0;
2164         }
2165
2166         if ((new_active) &&
2167             (old_active) &&
2168             (new_active->link == BOND_LINK_UP) &&
2169             IS_UP(new_active->dev)) {
2170                 write_lock_bh(&bond->curr_slave_lock);
2171                 bond_change_active_slave(bond, new_active);
2172                 write_unlock_bh(&bond->curr_slave_lock);
2173         } else
2174                 res = -EINVAL;
2175
2176         read_unlock(&bond->lock);
2177
2178         return res;
2179 }
2180
2181 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2182 {
2183         struct bonding *bond = netdev_priv(bond_dev);
2184
2185         info->bond_mode = bond->params.mode;
2186         info->miimon = bond->params.miimon;
2187
2188         read_lock(&bond->lock);
2189         info->num_slaves = bond->slave_cnt;
2190         read_unlock(&bond->lock);
2191
2192         return 0;
2193 }
2194
2195 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2196 {
2197         struct bonding *bond = netdev_priv(bond_dev);
2198         struct slave *slave;
2199         int i, res = -ENODEV;
2200
2201         read_lock(&bond->lock);
2202
2203         bond_for_each_slave(bond, slave, i) {
2204                 if (i == (int)info->slave_id) {
2205                         res = 0;
2206                         strcpy(info->slave_name, slave->dev->name);
2207                         info->link = slave->link;
2208                         info->state = slave->state;
2209                         info->link_failure_count = slave->link_failure_count;
2210                         break;
2211                 }
2212         }
2213
2214         read_unlock(&bond->lock);
2215
2216         return res;
2217 }
2218
2219 /*-------------------------------- Monitoring -------------------------------*/
2220
2221
2222 static int bond_miimon_inspect(struct bonding *bond)
2223 {
2224         struct slave *slave;
2225         int i, link_state, commit = 0;
2226         bool ignore_updelay;
2227
2228         ignore_updelay = !bond->curr_active_slave ? true : false;
2229
2230         bond_for_each_slave(bond, slave, i) {
2231                 slave->new_link = BOND_LINK_NOCHANGE;
2232
2233                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2234
2235                 switch (slave->link) {
2236                 case BOND_LINK_UP:
2237                         if (link_state)
2238                                 continue;
2239
2240                         slave->link = BOND_LINK_FAIL;
2241                         slave->delay = bond->params.downdelay;
2242                         if (slave->delay) {
2243                                 pr_info(DRV_NAME
2244                                        ": %s: link status down for %s"
2245                                        "interface %s, disabling it in %d ms.\n",
2246                                        bond->dev->name,
2247                                        (bond->params.mode ==
2248                                         BOND_MODE_ACTIVEBACKUP) ?
2249                                        ((slave->state == BOND_STATE_ACTIVE) ?
2250                                         "active " : "backup ") : "",
2251                                        slave->dev->name,
2252                                        bond->params.downdelay * bond->params.miimon);
2253                         }
2254                         /*FALLTHRU*/
2255                 case BOND_LINK_FAIL:
2256                         if (link_state) {
2257                                 /*
2258                                  * recovered before downdelay expired
2259                                  */
2260                                 slave->link = BOND_LINK_UP;
2261                                 slave->jiffies = jiffies;
2262                                 pr_info(DRV_NAME
2263                                        ": %s: link status up again after %d "
2264                                        "ms for interface %s.\n",
2265                                        bond->dev->name,
2266                                        (bond->params.downdelay - slave->delay) *
2267                                        bond->params.miimon,
2268                                        slave->dev->name);
2269                                 continue;
2270                         }
2271
2272                         if (slave->delay <= 0) {
2273                                 slave->new_link = BOND_LINK_DOWN;
2274                                 commit++;
2275                                 continue;
2276                         }
2277
2278                         slave->delay--;
2279                         break;
2280
2281                 case BOND_LINK_DOWN:
2282                         if (!link_state)
2283                                 continue;
2284
2285                         slave->link = BOND_LINK_BACK;
2286                         slave->delay = bond->params.updelay;
2287
2288                         if (slave->delay) {
2289                                 pr_info(DRV_NAME
2290                                        ": %s: link status up for "
2291                                        "interface %s, enabling it in %d ms.\n",
2292                                        bond->dev->name, slave->dev->name,
2293                                        ignore_updelay ? 0 :
2294                                        bond->params.updelay *
2295                                        bond->params.miimon);
2296                         }
2297                         /*FALLTHRU*/
2298                 case BOND_LINK_BACK:
2299                         if (!link_state) {
2300                                 slave->link = BOND_LINK_DOWN;
2301                                 pr_info(DRV_NAME
2302                                        ": %s: link status down again after %d "
2303                                        "ms for interface %s.\n",
2304                                        bond->dev->name,
2305                                        (bond->params.updelay - slave->delay) *
2306                                        bond->params.miimon,
2307                                        slave->dev->name);
2308
2309                                 continue;
2310                         }
2311
2312                         if (ignore_updelay)
2313                                 slave->delay = 0;
2314
2315                         if (slave->delay <= 0) {
2316                                 slave->new_link = BOND_LINK_UP;
2317                                 commit++;
2318                                 ignore_updelay = false;
2319                                 continue;
2320                         }
2321
2322                         slave->delay--;
2323                         break;
2324                 }
2325         }
2326
2327         return commit;
2328 }
2329
2330 static void bond_miimon_commit(struct bonding *bond)
2331 {
2332         struct slave *slave;
2333         int i;
2334
2335         bond_for_each_slave(bond, slave, i) {
2336                 switch (slave->new_link) {
2337                 case BOND_LINK_NOCHANGE:
2338                         continue;
2339
2340                 case BOND_LINK_UP:
2341                         slave->link = BOND_LINK_UP;
2342                         slave->jiffies = jiffies;
2343
2344                         if (bond->params.mode == BOND_MODE_8023AD) {
2345                                 /* prevent it from being the active one */
2346                                 slave->state = BOND_STATE_BACKUP;
2347                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2348                                 /* make it immediately active */
2349                                 slave->state = BOND_STATE_ACTIVE;
2350                         } else if (slave != bond->primary_slave) {
2351                                 /* prevent it from being the active one */
2352                                 slave->state = BOND_STATE_BACKUP;
2353                         }
2354
2355                         pr_info(DRV_NAME
2356                                ": %s: link status definitely "
2357                                "up for interface %s.\n",
2358                                bond->dev->name, slave->dev->name);
2359
2360                         /* notify ad that the link status has changed */
2361                         if (bond->params.mode == BOND_MODE_8023AD)
2362                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2363
2364                         if (bond_is_lb(bond))
2365                                 bond_alb_handle_link_change(bond, slave,
2366                                                             BOND_LINK_UP);
2367
2368                         if (!bond->curr_active_slave ||
2369                             (slave == bond->primary_slave))
2370                                 goto do_failover;
2371
2372                         continue;
2373
2374                 case BOND_LINK_DOWN:
2375                         if (slave->link_failure_count < UINT_MAX)
2376                                 slave->link_failure_count++;
2377
2378                         slave->link = BOND_LINK_DOWN;
2379
2380                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2381                             bond->params.mode == BOND_MODE_8023AD)
2382                                 bond_set_slave_inactive_flags(slave);
2383
2384                         pr_info(DRV_NAME
2385                                ": %s: link status definitely down for "
2386                                "interface %s, disabling it\n",
2387                                bond->dev->name, slave->dev->name);
2388
2389                         if (bond->params.mode == BOND_MODE_8023AD)
2390                                 bond_3ad_handle_link_change(slave,
2391                                                             BOND_LINK_DOWN);
2392
2393                         if (bond_is_lb(bond))
2394                                 bond_alb_handle_link_change(bond, slave,
2395                                                             BOND_LINK_DOWN);
2396
2397                         if (slave == bond->curr_active_slave)
2398                                 goto do_failover;
2399
2400                         continue;
2401
2402                 default:
2403                         pr_err(DRV_NAME
2404                                ": %s: invalid new link %d on slave %s\n",
2405                                bond->dev->name, slave->new_link,
2406                                slave->dev->name);
2407                         slave->new_link = BOND_LINK_NOCHANGE;
2408
2409                         continue;
2410                 }
2411
2412 do_failover:
2413                 ASSERT_RTNL();
2414                 write_lock_bh(&bond->curr_slave_lock);
2415                 bond_select_active_slave(bond);
2416                 write_unlock_bh(&bond->curr_slave_lock);
2417         }
2418
2419         bond_set_carrier(bond);
2420 }
2421
2422 /*
2423  * bond_mii_monitor
2424  *
2425  * Really a wrapper that splits the mii monitor into two phases: an
2426  * inspection, then (if inspection indicates something needs to be done)
2427  * an acquisition of appropriate locks followed by a commit phase to
2428  * implement whatever link state changes are indicated.
2429  */
2430 void bond_mii_monitor(struct work_struct *work)
2431 {
2432         struct bonding *bond = container_of(work, struct bonding,
2433                                             mii_work.work);
2434
2435         read_lock(&bond->lock);
2436         if (bond->kill_timers)
2437                 goto out;
2438
2439         if (bond->slave_cnt == 0)
2440                 goto re_arm;
2441
2442         if (bond->send_grat_arp) {
2443                 read_lock(&bond->curr_slave_lock);
2444                 bond_send_gratuitous_arp(bond);
2445                 read_unlock(&bond->curr_slave_lock);
2446         }
2447
2448         if (bond->send_unsol_na) {
2449                 read_lock(&bond->curr_slave_lock);
2450                 bond_send_unsolicited_na(bond);
2451                 read_unlock(&bond->curr_slave_lock);
2452         }
2453
2454         if (bond_miimon_inspect(bond)) {
2455                 read_unlock(&bond->lock);
2456                 rtnl_lock();
2457                 read_lock(&bond->lock);
2458
2459                 bond_miimon_commit(bond);
2460
2461                 read_unlock(&bond->lock);
2462                 rtnl_unlock();  /* might sleep, hold no other locks */
2463                 read_lock(&bond->lock);
2464         }
2465
2466 re_arm:
2467         if (bond->params.miimon)
2468                 queue_delayed_work(bond->wq, &bond->mii_work,
2469                                    msecs_to_jiffies(bond->params.miimon));
2470 out:
2471         read_unlock(&bond->lock);
2472 }
2473
2474 static __be32 bond_glean_dev_ip(struct net_device *dev)
2475 {
2476         struct in_device *idev;
2477         struct in_ifaddr *ifa;
2478         __be32 addr = 0;
2479
2480         if (!dev)
2481                 return 0;
2482
2483         rcu_read_lock();
2484         idev = __in_dev_get_rcu(dev);
2485         if (!idev)
2486                 goto out;
2487
2488         ifa = idev->ifa_list;
2489         if (!ifa)
2490                 goto out;
2491
2492         addr = ifa->ifa_local;
2493 out:
2494         rcu_read_unlock();
2495         return addr;
2496 }
2497
2498 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2499 {
2500         struct vlan_entry *vlan;
2501
2502         if (ip == bond->master_ip)
2503                 return 1;
2504
2505         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2506                 if (ip == vlan->vlan_ip)
2507                         return 1;
2508         }
2509
2510         return 0;
2511 }
2512
2513 /*
2514  * We go to the (large) trouble of VLAN tagging ARP frames because
2515  * switches in VLAN mode (especially if ports are configured as
2516  * "native" to a VLAN) might not pass non-tagged frames.
2517  */
2518 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2519 {
2520         struct sk_buff *skb;
2521
2522         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2523                slave_dev->name, dest_ip, src_ip, vlan_id);
2524
2525         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2526                          NULL, slave_dev->dev_addr, NULL);
2527
2528         if (!skb) {
2529                 pr_err(DRV_NAME ": ARP packet allocation failed\n");
2530                 return;
2531         }
2532         if (vlan_id) {
2533                 skb = vlan_put_tag(skb, vlan_id);
2534                 if (!skb) {
2535                         pr_err(DRV_NAME ": failed to insert VLAN tag\n");
2536                         return;
2537                 }
2538         }
2539         arp_xmit(skb);
2540 }
2541
2542
2543 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2544 {
2545         int i, vlan_id, rv;
2546         __be32 *targets = bond->params.arp_targets;
2547         struct vlan_entry *vlan;
2548         struct net_device *vlan_dev;
2549         struct flowi fl;
2550         struct rtable *rt;
2551
2552         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2553                 if (!targets[i])
2554                         break;
2555                 pr_debug("basa: target %x\n", targets[i]);
2556                 if (list_empty(&bond->vlan_list)) {
2557                         pr_debug("basa: empty vlan: arp_send\n");
2558                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2559                                       bond->master_ip, 0);
2560                         continue;
2561                 }
2562
2563                 /*
2564                  * If VLANs are configured, we do a route lookup to
2565                  * determine which VLAN interface would be used, so we
2566                  * can tag the ARP with the proper VLAN tag.
2567                  */
2568                 memset(&fl, 0, sizeof(fl));
2569                 fl.fl4_dst = targets[i];
2570                 fl.fl4_tos = RTO_ONLINK;
2571
2572                 rv = ip_route_output_key(&init_net, &rt, &fl);
2573                 if (rv) {
2574                         if (net_ratelimit()) {
2575                                 pr_warning(DRV_NAME
2576                              ": %s: no route to arp_ip_target %pI4\n",
2577                                        bond->dev->name, &fl.fl4_dst);
2578                         }
2579                         continue;
2580                 }
2581
2582                 /*
2583                  * This target is not on a VLAN
2584                  */
2585                 if (rt->u.dst.dev == bond->dev) {
2586                         ip_rt_put(rt);
2587                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2588                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2589                                       bond->master_ip, 0);
2590                         continue;
2591                 }
2592
2593                 vlan_id = 0;
2594                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2595                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2596                         if (vlan_dev == rt->u.dst.dev) {
2597                                 vlan_id = vlan->vlan_id;
2598                                 pr_debug("basa: vlan match on %s %d\n",
2599                                        vlan_dev->name, vlan_id);
2600                                 break;
2601                         }
2602                 }
2603
2604                 if (vlan_id) {
2605                         ip_rt_put(rt);
2606                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2607                                       vlan->vlan_ip, vlan_id);
2608                         continue;
2609                 }
2610
2611                 if (net_ratelimit()) {
2612                         pr_warning(DRV_NAME
2613                ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2614                                bond->dev->name, &fl.fl4_dst,
2615                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2616                 }
2617                 ip_rt_put(rt);
2618         }
2619 }
2620
2621 /*
2622  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2623  * for each VLAN above us.
2624  *
2625  * Caller must hold curr_slave_lock for read or better
2626  */
2627 static void bond_send_gratuitous_arp(struct bonding *bond)
2628 {
2629         struct slave *slave = bond->curr_active_slave;
2630         struct vlan_entry *vlan;
2631         struct net_device *vlan_dev;
2632
2633         pr_debug("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2634                                 slave ? slave->dev->name : "NULL");
2635
2636         if (!slave || !bond->send_grat_arp ||
2637             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2638                 return;
2639
2640         bond->send_grat_arp--;
2641
2642         if (bond->master_ip) {
2643                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2644                                 bond->master_ip, 0);
2645         }
2646
2647         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2648                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2649                 if (vlan->vlan_ip) {
2650                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2651                                       vlan->vlan_ip, vlan->vlan_id);
2652                 }
2653         }
2654 }
2655
2656 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2657 {
2658         int i;
2659         __be32 *targets = bond->params.arp_targets;
2660
2661         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2662                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2663                         &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2664                 if (sip == targets[i]) {
2665                         if (bond_has_this_ip(bond, tip))
2666                                 slave->last_arp_rx = jiffies;
2667                         return;
2668                 }
2669         }
2670 }
2671
2672 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2673 {
2674         struct arphdr *arp;
2675         struct slave *slave;
2676         struct bonding *bond;
2677         unsigned char *arp_ptr;
2678         __be32 sip, tip;
2679
2680         if (dev_net(dev) != &init_net)
2681                 goto out;
2682
2683         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2684                 goto out;
2685
2686         bond = netdev_priv(dev);
2687         read_lock(&bond->lock);
2688
2689         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2690                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2691                 orig_dev ? orig_dev->name : "NULL");
2692
2693         slave = bond_get_slave_by_dev(bond, orig_dev);
2694         if (!slave || !slave_do_arp_validate(bond, slave))
2695                 goto out_unlock;
2696
2697         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2698                 goto out_unlock;
2699
2700         arp = arp_hdr(skb);
2701         if (arp->ar_hln != dev->addr_len ||
2702             skb->pkt_type == PACKET_OTHERHOST ||
2703             skb->pkt_type == PACKET_LOOPBACK ||
2704             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2705             arp->ar_pro != htons(ETH_P_IP) ||
2706             arp->ar_pln != 4)
2707                 goto out_unlock;
2708
2709         arp_ptr = (unsigned char *)(arp + 1);
2710         arp_ptr += dev->addr_len;
2711         memcpy(&sip, arp_ptr, 4);
2712         arp_ptr += 4 + dev->addr_len;
2713         memcpy(&tip, arp_ptr, 4);
2714
2715         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2716                 bond->dev->name, slave->dev->name, slave->state,
2717                 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2718                 &sip, &tip);
2719
2720         /*
2721          * Backup slaves won't see the ARP reply, but do come through
2722          * here for each ARP probe (so we swap the sip/tip to validate
2723          * the probe).  In a "redundant switch, common router" type of
2724          * configuration, the ARP probe will (hopefully) travel from
2725          * the active, through one switch, the router, then the other
2726          * switch before reaching the backup.
2727          */
2728         if (slave->state == BOND_STATE_ACTIVE)
2729                 bond_validate_arp(bond, slave, sip, tip);
2730         else
2731                 bond_validate_arp(bond, slave, tip, sip);
2732
2733 out_unlock:
2734         read_unlock(&bond->lock);
2735 out:
2736         dev_kfree_skb(skb);
2737         return NET_RX_SUCCESS;
2738 }
2739
2740 /*
2741  * this function is called regularly to monitor each slave's link
2742  * ensuring that traffic is being sent and received when arp monitoring
2743  * is used in load-balancing mode. if the adapter has been dormant, then an
2744  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2745  * arp monitoring in active backup mode.
2746  */
2747 void bond_loadbalance_arp_mon(struct work_struct *work)
2748 {
2749         struct bonding *bond = container_of(work, struct bonding,
2750                                             arp_work.work);
2751         struct slave *slave, *oldcurrent;
2752         int do_failover = 0;
2753         int delta_in_ticks;
2754         int i;
2755
2756         read_lock(&bond->lock);
2757
2758         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2759
2760         if (bond->kill_timers)
2761                 goto out;
2762
2763         if (bond->slave_cnt == 0)
2764                 goto re_arm;
2765
2766         read_lock(&bond->curr_slave_lock);
2767         oldcurrent = bond->curr_active_slave;
2768         read_unlock(&bond->curr_slave_lock);
2769
2770         /* see if any of the previous devices are up now (i.e. they have
2771          * xmt and rcv traffic). the curr_active_slave does not come into
2772          * the picture unless it is null. also, slave->jiffies is not needed
2773          * here because we send an arp on each slave and give a slave as
2774          * long as it needs to get the tx/rx within the delta.
2775          * TODO: what about up/down delay in arp mode? it wasn't here before
2776          *       so it can wait
2777          */
2778         bond_for_each_slave(bond, slave, i) {
2779                 if (slave->link != BOND_LINK_UP) {
2780                         if (time_before_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) &&
2781                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2782
2783                                 slave->link  = BOND_LINK_UP;
2784                                 slave->state = BOND_STATE_ACTIVE;
2785
2786                                 /* primary_slave has no meaning in round-robin
2787                                  * mode. the window of a slave being up and
2788                                  * curr_active_slave being null after enslaving
2789                                  * is closed.
2790                                  */
2791                                 if (!oldcurrent) {
2792                                         pr_info(DRV_NAME
2793                                                ": %s: link status definitely "
2794                                                "up for interface %s, ",
2795                                                bond->dev->name,
2796                                                slave->dev->name);
2797                                         do_failover = 1;
2798                                 } else {
2799                                         pr_info(DRV_NAME
2800                                                ": %s: interface %s is now up\n",
2801                                                bond->dev->name,
2802                                                slave->dev->name);
2803                                 }
2804                         }
2805                 } else {
2806                         /* slave->link == BOND_LINK_UP */
2807
2808                         /* not all switches will respond to an arp request
2809                          * when the source ip is 0, so don't take the link down
2810                          * if we don't know our ip yet
2811                          */
2812                         if (time_after_eq(jiffies, dev_trans_start(slave->dev) + 2*delta_in_ticks) ||
2813                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2814
2815                                 slave->link  = BOND_LINK_DOWN;
2816                                 slave->state = BOND_STATE_BACKUP;
2817
2818                                 if (slave->link_failure_count < UINT_MAX)
2819                                         slave->link_failure_count++;
2820
2821                                 pr_info(DRV_NAME
2822                                        ": %s: interface %s is now down.\n",
2823                                        bond->dev->name,
2824                                        slave->dev->name);
2825
2826                                 if (slave == oldcurrent)
2827                                         do_failover = 1;
2828                         }
2829                 }
2830
2831                 /* note: if switch is in round-robin mode, all links
2832                  * must tx arp to ensure all links rx an arp - otherwise
2833                  * links may oscillate or not come up at all; if switch is
2834                  * in something like xor mode, there is nothing we can
2835                  * do - all replies will be rx'ed on same link causing slaves
2836                  * to be unstable during low/no traffic periods
2837                  */
2838                 if (IS_UP(slave->dev))
2839                         bond_arp_send_all(bond, slave);
2840         }
2841
2842         if (do_failover) {
2843                 write_lock_bh(&bond->curr_slave_lock);
2844
2845                 bond_select_active_slave(bond);
2846
2847                 write_unlock_bh(&bond->curr_slave_lock);
2848         }
2849
2850 re_arm:
2851         if (bond->params.arp_interval)
2852                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2853 out:
2854         read_unlock(&bond->lock);
2855 }
2856
2857 /*
2858  * Called to inspect slaves for active-backup mode ARP monitor link state
2859  * changes.  Sets new_link in slaves to specify what action should take
2860  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2861  * to link states must be committed.
2862  *
2863  * Called with bond->lock held for read.
2864  */
2865 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2866 {
2867         struct slave *slave;
2868         int i, commit = 0;
2869
2870         bond_for_each_slave(bond, slave, i) {
2871                 slave->new_link = BOND_LINK_NOCHANGE;
2872
2873                 if (slave->link != BOND_LINK_UP) {
2874                         if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2875                                            delta_in_ticks)) {
2876                                 slave->new_link = BOND_LINK_UP;
2877                                 commit++;
2878                         }
2879
2880                         continue;
2881                 }
2882
2883                 /*
2884                  * Give slaves 2*delta after being enslaved or made
2885                  * active.  This avoids bouncing, as the last receive
2886                  * times need a full ARP monitor cycle to be updated.
2887                  */
2888                 if (!time_after_eq(jiffies, slave->jiffies +
2889                                    2 * delta_in_ticks))
2890                         continue;
2891
2892                 /*
2893                  * Backup slave is down if:
2894                  * - No current_arp_slave AND
2895                  * - more than 3*delta since last receive AND
2896                  * - the bond has an IP address
2897                  *
2898                  * Note: a non-null current_arp_slave indicates
2899                  * the curr_active_slave went down and we are
2900                  * searching for a new one; under this condition
2901                  * we only take the curr_active_slave down - this
2902                  * gives each slave a chance to tx/rx traffic
2903                  * before being taken out
2904                  */
2905                 if (slave->state == BOND_STATE_BACKUP &&
2906                     !bond->current_arp_slave &&
2907                     time_after(jiffies, slave_last_rx(bond, slave) +
2908                                3 * delta_in_ticks)) {
2909                         slave->new_link = BOND_LINK_DOWN;
2910                         commit++;
2911                 }
2912
2913                 /*
2914                  * Active slave is down if:
2915                  * - more than 2*delta since transmitting OR
2916                  * - (more than 2*delta since receive AND
2917                  *    the bond has an IP address)
2918                  */
2919                 if ((slave->state == BOND_STATE_ACTIVE) &&
2920                     (time_after_eq(jiffies, dev_trans_start(slave->dev) +
2921                                     2 * delta_in_ticks) ||
2922                       (time_after_eq(jiffies, slave_last_rx(bond, slave)
2923                                      + 2 * delta_in_ticks)))) {
2924                         slave->new_link = BOND_LINK_DOWN;
2925                         commit++;
2926                 }
2927         }
2928
2929         read_lock(&bond->curr_slave_lock);
2930
2931         /*
2932          * Trigger a commit if the primary option setting has changed.
2933          */
2934         if (bond->primary_slave &&
2935             (bond->primary_slave != bond->curr_active_slave) &&
2936             (bond->primary_slave->link == BOND_LINK_UP))
2937                 commit++;
2938
2939         read_unlock(&bond->curr_slave_lock);
2940
2941         return commit;
2942 }
2943
2944 /*
2945  * Called to commit link state changes noted by inspection step of
2946  * active-backup mode ARP monitor.
2947  *
2948  * Called with RTNL and bond->lock for read.
2949  */
2950 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2951 {
2952         struct slave *slave;
2953         int i;
2954
2955         bond_for_each_slave(bond, slave, i) {
2956                 switch (slave->new_link) {
2957                 case BOND_LINK_NOCHANGE:
2958                         continue;
2959
2960                 case BOND_LINK_UP:
2961                         write_lock_bh(&bond->curr_slave_lock);
2962
2963                         if (!bond->curr_active_slave &&
2964                             time_before_eq(jiffies, dev_trans_start(slave->dev) +
2965                                            delta_in_ticks)) {
2966                                 slave->link = BOND_LINK_UP;
2967                                 bond_change_active_slave(bond, slave);
2968                                 bond->current_arp_slave = NULL;
2969
2970                                 pr_info(DRV_NAME
2971                                        ": %s: %s is up and now the "
2972                                        "active interface\n",
2973                                        bond->dev->name, slave->dev->name);
2974
2975                         } else if (bond->curr_active_slave != slave) {
2976                                 /* this slave has just come up but we
2977                                  * already have a current slave; this can
2978                                  * also happen if bond_enslave adds a new
2979                                  * slave that is up while we are searching
2980                                  * for a new slave
2981                                  */
2982                                 slave->link = BOND_LINK_UP;
2983                                 bond_set_slave_inactive_flags(slave);
2984                                 bond->current_arp_slave = NULL;
2985
2986                                 pr_info(DRV_NAME
2987                                        ": %s: backup interface %s is now up\n",
2988                                        bond->dev->name, slave->dev->name);
2989                         }
2990
2991                         write_unlock_bh(&bond->curr_slave_lock);
2992
2993                         break;
2994
2995                 case BOND_LINK_DOWN:
2996                         if (slave->link_failure_count < UINT_MAX)
2997                                 slave->link_failure_count++;
2998
2999                         slave->link = BOND_LINK_DOWN;
3000
3001                         if (slave == bond->curr_active_slave) {
3002                                 pr_info(DRV_NAME
3003                                        ": %s: link status down for active "
3004                                        "interface %s, disabling it\n",
3005                                        bond->dev->name, slave->dev->name);
3006
3007                                 bond_set_slave_inactive_flags(slave);
3008
3009                                 write_lock_bh(&bond->curr_slave_lock);
3010
3011                                 bond_select_active_slave(bond);
3012                                 if (bond->curr_active_slave)
3013                                         bond->curr_active_slave->jiffies =
3014                                                 jiffies;
3015
3016                                 write_unlock_bh(&bond->curr_slave_lock);
3017
3018                                 bond->current_arp_slave = NULL;
3019
3020                         } else if (slave->state == BOND_STATE_BACKUP) {
3021                                 pr_info(DRV_NAME
3022                                        ": %s: backup interface %s is now down\n",
3023                                        bond->dev->name, slave->dev->name);
3024
3025                                 bond_set_slave_inactive_flags(slave);
3026                         }
3027                         break;
3028
3029                 default:
3030                         pr_err(DRV_NAME
3031                                ": %s: impossible: new_link %d on slave %s\n",
3032                                bond->dev->name, slave->new_link,
3033                                slave->dev->name);
3034                 }
3035         }
3036
3037         /*
3038          * No race with changes to primary via sysfs, as we hold rtnl.
3039          */
3040         if (bond->primary_slave &&
3041             (bond->primary_slave != bond->curr_active_slave) &&
3042             (bond->primary_slave->link == BOND_LINK_UP)) {
3043                 write_lock_bh(&bond->curr_slave_lock);
3044                 bond_change_active_slave(bond, bond->primary_slave);
3045                 write_unlock_bh(&bond->curr_slave_lock);
3046         }
3047
3048         bond_set_carrier(bond);
3049 }
3050
3051 /*
3052  * Send ARP probes for active-backup mode ARP monitor.
3053  *
3054  * Called with bond->lock held for read.
3055  */
3056 static void bond_ab_arp_probe(struct bonding *bond)
3057 {
3058         struct slave *slave;
3059         int i;
3060
3061         read_lock(&bond->curr_slave_lock);
3062
3063         if (bond->current_arp_slave && bond->curr_active_slave)
3064                 pr_info(DRV_NAME "PROBE: c_arp %s && cas %s BAD\n",
3065                        bond->current_arp_slave->dev->name,
3066                        bond->curr_active_slave->dev->name);
3067
3068         if (bond->curr_active_slave) {
3069                 bond_arp_send_all(bond, bond->curr_active_slave);
3070                 read_unlock(&bond->curr_slave_lock);
3071                 return;
3072         }
3073
3074         read_unlock(&bond->curr_slave_lock);
3075
3076         /* if we don't have a curr_active_slave, search for the next available
3077          * backup slave from the current_arp_slave and make it the candidate
3078          * for becoming the curr_active_slave
3079          */
3080
3081         if (!bond->current_arp_slave) {
3082                 bond->current_arp_slave = bond->first_slave;
3083                 if (!bond->current_arp_slave)
3084                         return;
3085         }
3086
3087         bond_set_slave_inactive_flags(bond->current_arp_slave);
3088
3089         /* search for next candidate */
3090         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3091                 if (IS_UP(slave->dev)) {
3092                         slave->link = BOND_LINK_BACK;
3093                         bond_set_slave_active_flags(slave);
3094                         bond_arp_send_all(bond, slave);
3095                         slave->jiffies = jiffies;
3096                         bond->current_arp_slave = slave;
3097                         break;
3098                 }
3099
3100                 /* if the link state is up at this point, we
3101                  * mark it down - this can happen if we have
3102                  * simultaneous link failures and
3103                  * reselect_active_interface doesn't make this
3104                  * one the current slave so it is still marked
3105                  * up when it is actually down
3106                  */
3107                 if (slave->link == BOND_LINK_UP) {
3108                         slave->link = BOND_LINK_DOWN;
3109                         if (slave->link_failure_count < UINT_MAX)
3110                                 slave->link_failure_count++;
3111
3112                         bond_set_slave_inactive_flags(slave);
3113
3114                         pr_info(DRV_NAME
3115                                ": %s: backup interface %s is now down.\n",
3116                                bond->dev->name, slave->dev->name);
3117                 }
3118         }
3119 }
3120
3121 void bond_activebackup_arp_mon(struct work_struct *work)
3122 {
3123         struct bonding *bond = container_of(work, struct bonding,
3124                                             arp_work.work);
3125         int delta_in_ticks;
3126
3127         read_lock(&bond->lock);
3128
3129         if (bond->kill_timers)
3130                 goto out;
3131
3132         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3133
3134         if (bond->slave_cnt == 0)
3135                 goto re_arm;
3136
3137         if (bond->send_grat_arp) {
3138                 read_lock(&bond->curr_slave_lock);
3139                 bond_send_gratuitous_arp(bond);
3140                 read_unlock(&bond->curr_slave_lock);
3141         }
3142
3143         if (bond->send_unsol_na) {
3144                 read_lock(&bond->curr_slave_lock);
3145                 bond_send_unsolicited_na(bond);
3146                 read_unlock(&bond->curr_slave_lock);
3147         }
3148
3149         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3150                 read_unlock(&bond->lock);
3151                 rtnl_lock();
3152                 read_lock(&bond->lock);
3153
3154                 bond_ab_arp_commit(bond, delta_in_ticks);
3155
3156                 read_unlock(&bond->lock);
3157                 rtnl_unlock();
3158                 read_lock(&bond->lock);
3159         }
3160
3161         bond_ab_arp_probe(bond);
3162
3163 re_arm:
3164         if (bond->params.arp_interval)
3165                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3166 out:
3167         read_unlock(&bond->lock);
3168 }
3169
3170 /*------------------------------ proc/seq_file-------------------------------*/
3171
3172 #ifdef CONFIG_PROC_FS
3173
3174 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3175         __acquires(&dev_base_lock)
3176         __acquires(&bond->lock)
3177 {
3178         struct bonding *bond = seq->private;
3179         loff_t off = 0;
3180         struct slave *slave;
3181         int i;
3182
3183         /* make sure the bond won't be taken away */
3184         read_lock(&dev_base_lock);
3185         read_lock(&bond->lock);
3186
3187         if (*pos == 0)
3188                 return SEQ_START_TOKEN;
3189
3190         bond_for_each_slave(bond, slave, i) {
3191                 if (++off == *pos)
3192                         return slave;
3193         }
3194
3195         return NULL;
3196 }
3197
3198 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3199 {
3200         struct bonding *bond = seq->private;
3201         struct slave *slave = v;
3202
3203         ++*pos;
3204         if (v == SEQ_START_TOKEN)
3205                 return bond->first_slave;
3206
3207         slave = slave->next;
3208
3209         return (slave == bond->first_slave) ? NULL : slave;
3210 }
3211
3212 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3213         __releases(&bond->lock)
3214         __releases(&dev_base_lock)
3215 {
3216         struct bonding *bond = seq->private;
3217
3218         read_unlock(&bond->lock);
3219         read_unlock(&dev_base_lock);
3220 }
3221
3222 static void bond_info_show_master(struct seq_file *seq)
3223 {
3224         struct bonding *bond = seq->private;
3225         struct slave *curr;
3226         int i;
3227
3228         read_lock(&bond->curr_slave_lock);
3229         curr = bond->curr_active_slave;
3230         read_unlock(&bond->curr_slave_lock);
3231
3232         seq_printf(seq, "Bonding Mode: %s",
3233                    bond_mode_name(bond->params.mode));
3234
3235         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3236             bond->params.fail_over_mac)
3237                 seq_printf(seq, " (fail_over_mac %s)",
3238                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3239
3240         seq_printf(seq, "\n");
3241
3242         if (bond->params.mode == BOND_MODE_XOR ||
3243                 bond->params.mode == BOND_MODE_8023AD) {
3244                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3245                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3246                         bond->params.xmit_policy);
3247         }
3248
3249         if (USES_PRIMARY(bond->params.mode)) {
3250                 seq_printf(seq, "Primary Slave: %s\n",
3251                            (bond->primary_slave) ?
3252                            bond->primary_slave->dev->name : "None");
3253
3254                 seq_printf(seq, "Currently Active Slave: %s\n",
3255                            (curr) ? curr->dev->name : "None");
3256         }
3257
3258         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3259                    "up" : "down");
3260         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3261         seq_printf(seq, "Up Delay (ms): %d\n",
3262                    bond->params.updelay * bond->params.miimon);
3263         seq_printf(seq, "Down Delay (ms): %d\n",
3264                    bond->params.downdelay * bond->params.miimon);
3265
3266
3267         /* ARP information */
3268         if (bond->params.arp_interval > 0) {
3269                 int printed = 0;
3270                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3271                                 bond->params.arp_interval);
3272
3273                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3274
3275                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3276                         if (!bond->params.arp_targets[i])
3277                                 break;
3278                         if (printed)
3279                                 seq_printf(seq, ",");
3280                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3281                         printed = 1;
3282                 }
3283                 seq_printf(seq, "\n");
3284         }
3285
3286         if (bond->params.mode == BOND_MODE_8023AD) {
3287                 struct ad_info ad_info;
3288
3289                 seq_puts(seq, "\n802.3ad info\n");
3290                 seq_printf(seq, "LACP rate: %s\n",
3291                            (bond->params.lacp_fast) ? "fast" : "slow");
3292                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3293                            ad_select_tbl[bond->params.ad_select].modename);
3294
3295                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3296                         seq_printf(seq, "bond %s has no active aggregator\n",
3297                                    bond->dev->name);
3298                 } else {
3299                         seq_printf(seq, "Active Aggregator Info:\n");
3300
3301                         seq_printf(seq, "\tAggregator ID: %d\n",
3302                                    ad_info.aggregator_id);
3303                         seq_printf(seq, "\tNumber of ports: %d\n",
3304                                    ad_info.ports);
3305                         seq_printf(seq, "\tActor Key: %d\n",
3306                                    ad_info.actor_key);
3307                         seq_printf(seq, "\tPartner Key: %d\n",
3308                                    ad_info.partner_key);
3309                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3310                                    ad_info.partner_system);
3311                 }
3312         }
3313 }
3314
3315 static void bond_info_show_slave(struct seq_file *seq,
3316                                  const struct slave *slave)
3317 {
3318         struct bonding *bond = seq->private;
3319
3320         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3321         seq_printf(seq, "MII Status: %s\n",
3322                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3323         seq_printf(seq, "Link Failure Count: %u\n",
3324                    slave->link_failure_count);
3325
3326         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3327
3328         if (bond->params.mode == BOND_MODE_8023AD) {
3329                 const struct aggregator *agg
3330                         = SLAVE_AD_INFO(slave).port.aggregator;
3331
3332                 if (agg)
3333                         seq_printf(seq, "Aggregator ID: %d\n",
3334                                    agg->aggregator_identifier);
3335                 else
3336                         seq_puts(seq, "Aggregator ID: N/A\n");
3337         }
3338 }
3339
3340 static int bond_info_seq_show(struct seq_file *seq, void *v)
3341 {
3342         if (v == SEQ_START_TOKEN) {
3343                 seq_printf(seq, "%s\n", version);
3344                 bond_info_show_master(seq);
3345         } else
3346                 bond_info_show_slave(seq, v);
3347
3348         return 0;
3349 }
3350
3351 static const struct seq_operations bond_info_seq_ops = {
3352         .start = bond_info_seq_start,
3353         .next  = bond_info_seq_next,
3354         .stop  = bond_info_seq_stop,
3355         .show  = bond_info_seq_show,
3356 };
3357
3358 static int bond_info_open(struct inode *inode, struct file *file)
3359 {
3360         struct seq_file *seq;
3361         struct proc_dir_entry *proc;
3362         int res;
3363
3364         res = seq_open(file, &bond_info_seq_ops);
3365         if (!res) {
3366                 /* recover the pointer buried in proc_dir_entry data */
3367                 seq = file->private_data;
3368                 proc = PDE(inode);
3369                 seq->private = proc->data;
3370         }
3371
3372         return res;
3373 }
3374
3375 static const struct file_operations bond_info_fops = {
3376         .owner   = THIS_MODULE,
3377         .open    = bond_info_open,
3378         .read    = seq_read,
3379         .llseek  = seq_lseek,
3380         .release = seq_release,
3381 };
3382
3383 static int bond_create_proc_entry(struct bonding *bond)
3384 {
3385         struct net_device *bond_dev = bond->dev;
3386
3387         if (bond_proc_dir) {
3388                 bond->proc_entry = proc_create_data(bond_dev->name,
3389                                                     S_IRUGO, bond_proc_dir,
3390                                                     &bond_info_fops, bond);
3391                 if (bond->proc_entry == NULL)
3392                         pr_warning(DRV_NAME
3393                                ": Warning: Cannot create /proc/net/%s/%s\n",
3394                                DRV_NAME, bond_dev->name);
3395                 else
3396                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3397         }
3398
3399         return 0;
3400 }
3401
3402 static void bond_remove_proc_entry(struct bonding *bond)
3403 {
3404         if (bond_proc_dir && bond->proc_entry) {
3405                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3406                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3407                 bond->proc_entry = NULL;
3408         }
3409 }
3410
3411 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3412  * Caller must hold rtnl_lock.
3413  */
3414 static void bond_create_proc_dir(void)
3415 {
3416         if (!bond_proc_dir) {
3417                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3418                 if (!bond_proc_dir)
3419                         pr_warning(DRV_NAME
3420                                 ": Warning: cannot create /proc/net/%s\n",
3421                                 DRV_NAME);
3422         }
3423 }
3424
3425 /* Destroy the bonding directory under /proc/net, if empty.
3426  * Caller must hold rtnl_lock.
3427  */
3428 static void bond_destroy_proc_dir(void)
3429 {
3430         if (bond_proc_dir) {
3431                 remove_proc_entry(DRV_NAME, init_net.proc_net);