net/bonding: Handlle wrong assumptions that slave is always an Ethernet device
[linux-2.6.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 //#define BONDING_DEBUG 1
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
43 #include <linux/in.h>
44 #include <net/ip.h>
45 #include <linux/ip.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
56 #include <asm/system.h>
57 #include <asm/io.h>
58 #include <asm/dma.h>
59 #include <asm/uaccess.h>
60 #include <linux/errno.h>
61 #include <linux/netdevice.h>
62 #include <linux/inetdevice.h>
63 #include <linux/igmp.h>
64 #include <linux/etherdevice.h>
65 #include <linux/skbuff.h>
66 #include <net/sock.h>
67 #include <linux/rtnetlink.h>
68 #include <linux/proc_fs.h>
69 #include <linux/seq_file.h>
70 #include <linux/smp.h>
71 #include <linux/if_ether.h>
72 #include <net/arp.h>
73 #include <linux/mii.h>
74 #include <linux/ethtool.h>
75 #include <linux/if_vlan.h>
76 #include <linux/if_bonding.h>
77 #include <net/route.h>
78 #include <net/net_namespace.h>
79 #include "bonding.h"
80 #include "bond_3ad.h"
81 #include "bond_alb.h"
82
83 /*---------------------------- Module parameters ----------------------------*/
84
85 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
86 #define BOND_LINK_MON_INTERV    0
87 #define BOND_LINK_ARP_INTERV    0
88
89 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
90 static int miimon       = BOND_LINK_MON_INTERV;
91 static int updelay      = 0;
92 static int downdelay    = 0;
93 static int use_carrier  = 1;
94 static char *mode       = NULL;
95 static char *primary    = NULL;
96 static char *lacp_rate  = NULL;
97 static char *xmit_hash_policy = NULL;
98 static int arp_interval = BOND_LINK_ARP_INTERV;
99 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
100 static char *arp_validate = NULL;
101 struct bond_params bonding_defaults;
102
103 module_param(max_bonds, int, 0);
104 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
105 module_param(miimon, int, 0);
106 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
107 module_param(updelay, int, 0);
108 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
109 module_param(downdelay, int, 0);
110 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
111                             "in milliseconds");
112 module_param(use_carrier, int, 0);
113 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
114                               "0 for off, 1 for on (default)");
115 module_param(mode, charp, 0);
116 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
117                        "1 for active-backup, 2 for balance-xor, "
118                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
119                        "6 for balance-alb");
120 module_param(primary, charp, 0);
121 MODULE_PARM_DESC(primary, "Primary network device to use");
122 module_param(lacp_rate, charp, 0);
123 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
124                             "(slow/fast)");
125 module_param(xmit_hash_policy, charp, 0);
126 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
127                                    ", 1 for layer 3+4");
128 module_param(arp_interval, int, 0);
129 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
130 module_param_array(arp_ip_target, charp, NULL, 0);
131 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
132 module_param(arp_validate, charp, 0);
133 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
134
135 /*----------------------------- Global variables ----------------------------*/
136
137 static const char * const version =
138         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
139
140 LIST_HEAD(bond_dev_list);
141
142 #ifdef CONFIG_PROC_FS
143 static struct proc_dir_entry *bond_proc_dir = NULL;
144 #endif
145
146 extern struct rw_semaphore bonding_rwsem;
147 static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
148 static int arp_ip_count = 0;
149 static int bond_mode    = BOND_MODE_ROUNDROBIN;
150 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
151 static int lacp_fast    = 0;
152
153
154 struct bond_parm_tbl bond_lacp_tbl[] = {
155 {       "slow",         AD_LACP_SLOW},
156 {       "fast",         AD_LACP_FAST},
157 {       NULL,           -1},
158 };
159
160 struct bond_parm_tbl bond_mode_tbl[] = {
161 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
162 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
163 {       "balance-xor",          BOND_MODE_XOR},
164 {       "broadcast",            BOND_MODE_BROADCAST},
165 {       "802.3ad",              BOND_MODE_8023AD},
166 {       "balance-tlb",          BOND_MODE_TLB},
167 {       "balance-alb",          BOND_MODE_ALB},
168 {       NULL,                   -1},
169 };
170
171 struct bond_parm_tbl xmit_hashtype_tbl[] = {
172 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
173 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
174 {       NULL,                   -1},
175 };
176
177 struct bond_parm_tbl arp_validate_tbl[] = {
178 {       "none",                 BOND_ARP_VALIDATE_NONE},
179 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
180 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
181 {       "all",                  BOND_ARP_VALIDATE_ALL},
182 {       NULL,                   -1},
183 };
184
185 /*-------------------------- Forward declarations ---------------------------*/
186
187 static void bond_send_gratuitous_arp(struct bonding *bond);
188
189 /*---------------------------- General routines -----------------------------*/
190
191 static const char *bond_mode_name(int mode)
192 {
193         switch (mode) {
194         case BOND_MODE_ROUNDROBIN :
195                 return "load balancing (round-robin)";
196         case BOND_MODE_ACTIVEBACKUP :
197                 return "fault-tolerance (active-backup)";
198         case BOND_MODE_XOR :
199                 return "load balancing (xor)";
200         case BOND_MODE_BROADCAST :
201                 return "fault-tolerance (broadcast)";
202         case BOND_MODE_8023AD:
203                 return "IEEE 802.3ad Dynamic link aggregation";
204         case BOND_MODE_TLB:
205                 return "transmit load balancing";
206         case BOND_MODE_ALB:
207                 return "adaptive load balancing";
208         default:
209                 return "unknown";
210         }
211 }
212
213 /*---------------------------------- VLAN -----------------------------------*/
214
215 /**
216  * bond_add_vlan - add a new vlan id on bond
217  * @bond: bond that got the notification
218  * @vlan_id: the vlan id to add
219  *
220  * Returns -ENOMEM if allocation failed.
221  */
222 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
223 {
224         struct vlan_entry *vlan;
225
226         dprintk("bond: %s, vlan id %d\n",
227                 (bond ? bond->dev->name: "None"), vlan_id);
228
229         vlan = kmalloc(sizeof(struct vlan_entry), GFP_KERNEL);
230         if (!vlan) {
231                 return -ENOMEM;
232         }
233
234         INIT_LIST_HEAD(&vlan->vlan_list);
235         vlan->vlan_id = vlan_id;
236         vlan->vlan_ip = 0;
237
238         write_lock_bh(&bond->lock);
239
240         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
241
242         write_unlock_bh(&bond->lock);
243
244         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
245
246         return 0;
247 }
248
249 /**
250  * bond_del_vlan - delete a vlan id from bond
251  * @bond: bond that got the notification
252  * @vlan_id: the vlan id to delete
253  *
254  * returns -ENODEV if @vlan_id was not found in @bond.
255  */
256 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
257 {
258         struct vlan_entry *vlan, *next;
259         int res = -ENODEV;
260
261         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
262
263         write_lock_bh(&bond->lock);
264
265         list_for_each_entry_safe(vlan, next, &bond->vlan_list, vlan_list) {
266                 if (vlan->vlan_id == vlan_id) {
267                         list_del(&vlan->vlan_list);
268
269                         if ((bond->params.mode == BOND_MODE_TLB) ||
270                             (bond->params.mode == BOND_MODE_ALB)) {
271                                 bond_alb_clear_vlan(bond, vlan_id);
272                         }
273
274                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
275                                 bond->dev->name);
276
277                         kfree(vlan);
278
279                         if (list_empty(&bond->vlan_list) &&
280                             (bond->slave_cnt == 0)) {
281                                 /* Last VLAN removed and no slaves, so
282                                  * restore block on adding VLANs. This will
283                                  * be removed once new slaves that are not
284                                  * VLAN challenged will be added.
285                                  */
286                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
287                         }
288
289                         res = 0;
290                         goto out;
291                 }
292         }
293
294         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
295                 bond->dev->name);
296
297 out:
298         write_unlock_bh(&bond->lock);
299         return res;
300 }
301
302 /**
303  * bond_has_challenged_slaves
304  * @bond: the bond we're working on
305  *
306  * Searches the slave list. Returns 1 if a vlan challenged slave
307  * was found, 0 otherwise.
308  *
309  * Assumes bond->lock is held.
310  */
311 static int bond_has_challenged_slaves(struct bonding *bond)
312 {
313         struct slave *slave;
314         int i;
315
316         bond_for_each_slave(bond, slave, i) {
317                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
318                         dprintk("found VLAN challenged slave - %s\n",
319                                 slave->dev->name);
320                         return 1;
321                 }
322         }
323
324         dprintk("no VLAN challenged slaves found\n");
325         return 0;
326 }
327
328 /**
329  * bond_next_vlan - safely skip to the next item in the vlans list.
330  * @bond: the bond we're working on
331  * @curr: item we're advancing from
332  *
333  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
334  * or @curr->next otherwise (even if it is @curr itself again).
335  * 
336  * Caller must hold bond->lock
337  */
338 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
339 {
340         struct vlan_entry *next, *last;
341
342         if (list_empty(&bond->vlan_list)) {
343                 return NULL;
344         }
345
346         if (!curr) {
347                 next = list_entry(bond->vlan_list.next,
348                                   struct vlan_entry, vlan_list);
349         } else {
350                 last = list_entry(bond->vlan_list.prev,
351                                   struct vlan_entry, vlan_list);
352                 if (last == curr) {
353                         next = list_entry(bond->vlan_list.next,
354                                           struct vlan_entry, vlan_list);
355                 } else {
356                         next = list_entry(curr->vlan_list.next,
357                                           struct vlan_entry, vlan_list);
358                 }
359         }
360
361         return next;
362 }
363
364 /**
365  * bond_dev_queue_xmit - Prepare skb for xmit.
366  * 
367  * @bond: bond device that got this skb for tx.
368  * @skb: hw accel VLAN tagged skb to transmit
369  * @slave_dev: slave that is supposed to xmit this skbuff
370  * 
371  * When the bond gets an skb to transmit that is
372  * already hardware accelerated VLAN tagged, and it
373  * needs to relay this skb to a slave that is not
374  * hw accel capable, the skb needs to be "unaccelerated",
375  * i.e. strip the hwaccel tag and re-insert it as part
376  * of the payload.
377  */
378 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
379 {
380         unsigned short vlan_id;
381
382         if (!list_empty(&bond->vlan_list) &&
383             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
384             vlan_get_tag(skb, &vlan_id) == 0) {
385                 skb->dev = slave_dev;
386                 skb = vlan_put_tag(skb, vlan_id);
387                 if (!skb) {
388                         /* vlan_put_tag() frees the skb in case of error,
389                          * so return success here so the calling functions
390                          * won't attempt to free is again.
391                          */
392                         return 0;
393                 }
394         } else {
395                 skb->dev = slave_dev;
396         }
397
398         skb->priority = 1;
399         dev_queue_xmit(skb);
400
401         return 0;
402 }
403
404 /*
405  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
406  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
407  * lock because:
408  * a. This operation is performed in IOCTL context,
409  * b. The operation is protected by the RTNL semaphore in the 8021q code,
410  * c. Holding a lock with BH disabled while directly calling a base driver
411  *    entry point is generally a BAD idea.
412  * 
413  * The design of synchronization/protection for this operation in the 8021q
414  * module is good for one or more VLAN devices over a single physical device
415  * and cannot be extended for a teaming solution like bonding, so there is a
416  * potential race condition here where a net device from the vlan group might
417  * be referenced (either by a base driver or the 8021q code) while it is being
418  * removed from the system. However, it turns out we're not making matters
419  * worse, and if it works for regular VLAN usage it will work here too.
420 */
421
422 /**
423  * bond_vlan_rx_register - Propagates registration to slaves
424  * @bond_dev: bonding net device that got called
425  * @grp: vlan group being registered
426  */
427 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
428 {
429         struct bonding *bond = bond_dev->priv;
430         struct slave *slave;
431         int i;
432
433         bond->vlgrp = grp;
434
435         bond_for_each_slave(bond, slave, i) {
436                 struct net_device *slave_dev = slave->dev;
437
438                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
439                     slave_dev->vlan_rx_register) {
440                         slave_dev->vlan_rx_register(slave_dev, grp);
441                 }
442         }
443 }
444
445 /**
446  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
447  * @bond_dev: bonding net device that got called
448  * @vid: vlan id being added
449  */
450 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
451 {
452         struct bonding *bond = bond_dev->priv;
453         struct slave *slave;
454         int i, res;
455
456         bond_for_each_slave(bond, slave, i) {
457                 struct net_device *slave_dev = slave->dev;
458
459                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
460                     slave_dev->vlan_rx_add_vid) {
461                         slave_dev->vlan_rx_add_vid(slave_dev, vid);
462                 }
463         }
464
465         res = bond_add_vlan(bond, vid);
466         if (res) {
467                 printk(KERN_ERR DRV_NAME
468                        ": %s: Error: Failed to add vlan id %d\n",
469                        bond_dev->name, vid);
470         }
471 }
472
473 /**
474  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
475  * @bond_dev: bonding net device that got called
476  * @vid: vlan id being removed
477  */
478 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
479 {
480         struct bonding *bond = bond_dev->priv;
481         struct slave *slave;
482         struct net_device *vlan_dev;
483         int i, res;
484
485         bond_for_each_slave(bond, slave, i) {
486                 struct net_device *slave_dev = slave->dev;
487
488                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
489                     slave_dev->vlan_rx_kill_vid) {
490                         /* Save and then restore vlan_dev in the grp array,
491                          * since the slave's driver might clear it.
492                          */
493                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
494                         slave_dev->vlan_rx_kill_vid(slave_dev, vid);
495                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
496                 }
497         }
498
499         res = bond_del_vlan(bond, vid);
500         if (res) {
501                 printk(KERN_ERR DRV_NAME
502                        ": %s: Error: Failed to remove vlan id %d\n",
503                        bond_dev->name, vid);
504         }
505 }
506
507 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
508 {
509         struct vlan_entry *vlan;
510
511         write_lock_bh(&bond->lock);
512
513         if (list_empty(&bond->vlan_list)) {
514                 goto out;
515         }
516
517         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
518             slave_dev->vlan_rx_register) {
519                 slave_dev->vlan_rx_register(slave_dev, bond->vlgrp);
520         }
521
522         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
523             !(slave_dev->vlan_rx_add_vid)) {
524                 goto out;
525         }
526
527         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
528                 slave_dev->vlan_rx_add_vid(slave_dev, vlan->vlan_id);
529         }
530
531 out:
532         write_unlock_bh(&bond->lock);
533 }
534
535 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
536 {
537         struct vlan_entry *vlan;
538         struct net_device *vlan_dev;
539
540         write_lock_bh(&bond->lock);
541
542         if (list_empty(&bond->vlan_list)) {
543                 goto out;
544         }
545
546         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
547             !(slave_dev->vlan_rx_kill_vid)) {
548                 goto unreg;
549         }
550
551         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
552                 /* Save and then restore vlan_dev in the grp array,
553                  * since the slave's driver might clear it.
554                  */
555                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
556                 slave_dev->vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
557                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
558         }
559
560 unreg:
561         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
562             slave_dev->vlan_rx_register) {
563                 slave_dev->vlan_rx_register(slave_dev, NULL);
564         }
565
566 out:
567         write_unlock_bh(&bond->lock);
568 }
569
570 /*------------------------------- Link status -------------------------------*/
571
572 /*
573  * Set the carrier state for the master according to the state of its
574  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
575  * do special 802.3ad magic.
576  *
577  * Returns zero if carrier state does not change, nonzero if it does.
578  */
579 static int bond_set_carrier(struct bonding *bond)
580 {
581         struct slave *slave;
582         int i;
583
584         if (bond->slave_cnt == 0)
585                 goto down;
586
587         if (bond->params.mode == BOND_MODE_8023AD)
588                 return bond_3ad_set_carrier(bond);
589
590         bond_for_each_slave(bond, slave, i) {
591                 if (slave->link == BOND_LINK_UP) {
592                         if (!netif_carrier_ok(bond->dev)) {
593                                 netif_carrier_on(bond->dev);
594                                 return 1;
595                         }
596                         return 0;
597                 }
598         }
599
600 down:
601         if (netif_carrier_ok(bond->dev)) {
602                 netif_carrier_off(bond->dev);
603                 return 1;
604         }
605         return 0;
606 }
607
608 /*
609  * Get link speed and duplex from the slave's base driver
610  * using ethtool. If for some reason the call fails or the
611  * values are invalid, fake speed and duplex to 100/Full
612  * and return error.
613  */
614 static int bond_update_speed_duplex(struct slave *slave)
615 {
616         struct net_device *slave_dev = slave->dev;
617         struct ethtool_cmd etool;
618         int res;
619
620         /* Fake speed and duplex */
621         slave->speed = SPEED_100;
622         slave->duplex = DUPLEX_FULL;
623
624         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
625                 return -1;
626
627         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
628         if (res < 0)
629                 return -1;
630
631         switch (etool.speed) {
632         case SPEED_10:
633         case SPEED_100:
634         case SPEED_1000:
635         case SPEED_10000:
636                 break;
637         default:
638                 return -1;
639         }
640
641         switch (etool.duplex) {
642         case DUPLEX_FULL:
643         case DUPLEX_HALF:
644                 break;
645         default:
646                 return -1;
647         }
648
649         slave->speed = etool.speed;
650         slave->duplex = etool.duplex;
651
652         return 0;
653 }
654
655 /*
656  * if <dev> supports MII link status reporting, check its link status.
657  *
658  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
659  * depening upon the setting of the use_carrier parameter.
660  *
661  * Return either BMSR_LSTATUS, meaning that the link is up (or we
662  * can't tell and just pretend it is), or 0, meaning that the link is
663  * down.
664  *
665  * If reporting is non-zero, instead of faking link up, return -1 if
666  * both ETHTOOL and MII ioctls fail (meaning the device does not
667  * support them).  If use_carrier is set, return whatever it says.
668  * It'd be nice if there was a good way to tell if a driver supports
669  * netif_carrier, but there really isn't.
670  */
671 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
672 {
673         static int (* ioctl)(struct net_device *, struct ifreq *, int);
674         struct ifreq ifr;
675         struct mii_ioctl_data *mii;
676
677         if (bond->params.use_carrier) {
678                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
679         }
680
681         ioctl = slave_dev->do_ioctl;
682         if (ioctl) {
683                 /* TODO: set pointer to correct ioctl on a per team member */
684                 /*       bases to make this more efficient. that is, once  */
685                 /*       we determine the correct ioctl, we will always    */
686                 /*       call it and not the others for that team          */
687                 /*       member.                                           */
688
689                 /*
690                  * We cannot assume that SIOCGMIIPHY will also read a
691                  * register; not all network drivers (e.g., e100)
692                  * support that.
693                  */
694
695                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
696                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
697                 mii = if_mii(&ifr);
698                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
699                         mii->reg_num = MII_BMSR;
700                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
701                                 return (mii->val_out & BMSR_LSTATUS);
702                         }
703                 }
704         }
705
706         /*
707          * Some drivers cache ETHTOOL_GLINK for a period of time so we only
708          * attempt to get link status from it if the above MII ioctls fail.
709          */
710         if (slave_dev->ethtool_ops) {
711                 if (slave_dev->ethtool_ops->get_link) {
712                         u32 link;
713
714                         link = slave_dev->ethtool_ops->get_link(slave_dev);
715
716                         return link ? BMSR_LSTATUS : 0;
717                 }
718         }
719
720         /*
721          * If reporting, report that either there's no dev->do_ioctl,
722          * or both SIOCGMIIREG and get_link failed (meaning that we
723          * cannot report link status).  If not reporting, pretend
724          * we're ok.
725          */
726         return (reporting ? -1 : BMSR_LSTATUS);
727 }
728
729 /*----------------------------- Multicast list ------------------------------*/
730
731 /*
732  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
733  */
734 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
735 {
736         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
737                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
738 }
739
740 /*
741  * returns dmi entry if found, NULL otherwise
742  */
743 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
744 {
745         struct dev_mc_list *idmi;
746
747         for (idmi = mc_list; idmi; idmi = idmi->next) {
748                 if (bond_is_dmi_same(dmi, idmi)) {
749                         return idmi;
750                 }
751         }
752
753         return NULL;
754 }
755
756 /*
757  * Push the promiscuity flag down to appropriate slaves
758  */
759 static void bond_set_promiscuity(struct bonding *bond, int inc)
760 {
761         if (USES_PRIMARY(bond->params.mode)) {
762                 /* write lock already acquired */
763                 if (bond->curr_active_slave) {
764                         dev_set_promiscuity(bond->curr_active_slave->dev, inc);
765                 }
766         } else {
767                 struct slave *slave;
768                 int i;
769                 bond_for_each_slave(bond, slave, i) {
770                         dev_set_promiscuity(slave->dev, inc);
771                 }
772         }
773 }
774
775 /*
776  * Push the allmulti flag down to all slaves
777  */
778 static void bond_set_allmulti(struct bonding *bond, int inc)
779 {
780         if (USES_PRIMARY(bond->params.mode)) {
781                 /* write lock already acquired */
782                 if (bond->curr_active_slave) {
783                         dev_set_allmulti(bond->curr_active_slave->dev, inc);
784                 }
785         } else {
786                 struct slave *slave;
787                 int i;
788                 bond_for_each_slave(bond, slave, i) {
789                         dev_set_allmulti(slave->dev, inc);
790                 }
791         }
792 }
793
794 /*
795  * Add a Multicast address to slaves
796  * according to mode
797  */
798 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
799 {
800         if (USES_PRIMARY(bond->params.mode)) {
801                 /* write lock already acquired */
802                 if (bond->curr_active_slave) {
803                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
804                 }
805         } else {
806                 struct slave *slave;
807                 int i;
808                 bond_for_each_slave(bond, slave, i) {
809                         dev_mc_add(slave->dev, addr, alen, 0);
810                 }
811         }
812 }
813
814 /*
815  * Remove a multicast address from slave
816  * according to mode
817  */
818 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
819 {
820         if (USES_PRIMARY(bond->params.mode)) {
821                 /* write lock already acquired */
822                 if (bond->curr_active_slave) {
823                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
824                 }
825         } else {
826                 struct slave *slave;
827                 int i;
828                 bond_for_each_slave(bond, slave, i) {
829                         dev_mc_delete(slave->dev, addr, alen, 0);
830                 }
831         }
832 }
833
834
835 /*
836  * Retrieve the list of registered multicast addresses for the bonding
837  * device and retransmit an IGMP JOIN request to the current active
838  * slave.
839  */
840 static void bond_resend_igmp_join_requests(struct bonding *bond)
841 {
842         struct in_device *in_dev;
843         struct ip_mc_list *im;
844
845         rcu_read_lock();
846         in_dev = __in_dev_get_rcu(bond->dev);
847         if (in_dev) {
848                 for (im = in_dev->mc_list; im; im = im->next) {
849                         ip_mc_rejoin_group(im);
850                 }
851         }
852
853         rcu_read_unlock();
854 }
855
856 /*
857  * Totally destroys the mc_list in bond
858  */
859 static void bond_mc_list_destroy(struct bonding *bond)
860 {
861         struct dev_mc_list *dmi;
862
863         dmi = bond->mc_list;
864         while (dmi) {
865                 bond->mc_list = dmi->next;
866                 kfree(dmi);
867                 dmi = bond->mc_list;
868         }
869         bond->mc_list = NULL;
870 }
871
872 /*
873  * Copy all the Multicast addresses from src to the bonding device dst
874  */
875 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
876                              gfp_t gfp_flag)
877 {
878         struct dev_mc_list *dmi, *new_dmi;
879
880         for (dmi = mc_list; dmi; dmi = dmi->next) {
881                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
882
883                 if (!new_dmi) {
884                         /* FIXME: Potential memory leak !!! */
885                         return -ENOMEM;
886                 }
887
888                 new_dmi->next = bond->mc_list;
889                 bond->mc_list = new_dmi;
890                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
891                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
892                 new_dmi->dmi_users = dmi->dmi_users;
893                 new_dmi->dmi_gusers = dmi->dmi_gusers;
894         }
895
896         return 0;
897 }
898
899 /*
900  * flush all members of flush->mc_list from device dev->mc_list
901  */
902 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
903 {
904         struct bonding *bond = bond_dev->priv;
905         struct dev_mc_list *dmi;
906
907         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
908                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
909         }
910
911         if (bond->params.mode == BOND_MODE_8023AD) {
912                 /* del lacpdu mc addr from mc list */
913                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
914
915                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
916         }
917 }
918
919 /*--------------------------- Active slave change ---------------------------*/
920
921 /*
922  * Update the mc list and multicast-related flags for the new and
923  * old active slaves (if any) according to the multicast mode, and
924  * promiscuous flags unconditionally.
925  */
926 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
927 {
928         struct dev_mc_list *dmi;
929
930         if (!USES_PRIMARY(bond->params.mode)) {
931                 /* nothing to do -  mc list is already up-to-date on
932                  * all slaves
933                  */
934                 return;
935         }
936
937         if (old_active) {
938                 if (bond->dev->flags & IFF_PROMISC) {
939                         dev_set_promiscuity(old_active->dev, -1);
940                 }
941
942                 if (bond->dev->flags & IFF_ALLMULTI) {
943                         dev_set_allmulti(old_active->dev, -1);
944                 }
945
946                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
947                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
948                 }
949         }
950
951         if (new_active) {
952                 if (bond->dev->flags & IFF_PROMISC) {
953                         dev_set_promiscuity(new_active->dev, 1);
954                 }
955
956                 if (bond->dev->flags & IFF_ALLMULTI) {
957                         dev_set_allmulti(new_active->dev, 1);
958                 }
959
960                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
961                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
962                 }
963                 bond_resend_igmp_join_requests(bond);
964         }
965 }
966
967 /**
968  * find_best_interface - select the best available slave to be the active one
969  * @bond: our bonding struct
970  *
971  * Warning: Caller must hold curr_slave_lock for writing.
972  */
973 static struct slave *bond_find_best_slave(struct bonding *bond)
974 {
975         struct slave *new_active, *old_active;
976         struct slave *bestslave = NULL;
977         int mintime = bond->params.updelay;
978         int i;
979
980         new_active = old_active = bond->curr_active_slave;
981
982         if (!new_active) { /* there were no active slaves left */
983                 if (bond->slave_cnt > 0) {  /* found one slave */
984                         new_active = bond->first_slave;
985                 } else {
986                         return NULL; /* still no slave, return NULL */
987                 }
988         }
989
990         /* first try the primary link; if arping, a link must tx/rx traffic
991          * before it can be considered the curr_active_slave - also, we would skip
992          * slaves between the curr_active_slave and primary_slave that may be up
993          * and able to arp
994          */
995         if ((bond->primary_slave) &&
996             (!bond->params.arp_interval) &&
997             (IS_UP(bond->primary_slave->dev))) {
998                 new_active = bond->primary_slave;
999         }
1000
1001         /* remember where to stop iterating over the slaves */
1002         old_active = new_active;
1003
1004         bond_for_each_slave_from(bond, new_active, i, old_active) {
1005                 if (IS_UP(new_active->dev)) {
1006                         if (new_active->link == BOND_LINK_UP) {
1007                                 return new_active;
1008                         } else if (new_active->link == BOND_LINK_BACK) {
1009                                 /* link up, but waiting for stabilization */
1010                                 if (new_active->delay < mintime) {
1011                                         mintime = new_active->delay;
1012                                         bestslave = new_active;
1013                                 }
1014                         }
1015                 }
1016         }
1017
1018         return bestslave;
1019 }
1020
1021 /**
1022  * change_active_interface - change the active slave into the specified one
1023  * @bond: our bonding struct
1024  * @new: the new slave to make the active one
1025  *
1026  * Set the new slave to the bond's settings and unset them on the old
1027  * curr_active_slave.
1028  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1029  *
1030  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1031  * because it is apparently the best available slave we have, even though its
1032  * updelay hasn't timed out yet.
1033  *
1034  * Warning: Caller must hold curr_slave_lock for writing.
1035  */
1036 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1037 {
1038         struct slave *old_active = bond->curr_active_slave;
1039
1040         if (old_active == new_active) {
1041                 return;
1042         }
1043
1044         if (new_active) {
1045                 if (new_active->link == BOND_LINK_BACK) {
1046                         if (USES_PRIMARY(bond->params.mode)) {
1047                                 printk(KERN_INFO DRV_NAME
1048                                        ": %s: making interface %s the new "
1049                                        "active one %d ms earlier.\n",
1050                                        bond->dev->name, new_active->dev->name,
1051                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1052                         }
1053
1054                         new_active->delay = 0;
1055                         new_active->link = BOND_LINK_UP;
1056                         new_active->jiffies = jiffies;
1057
1058                         if (bond->params.mode == BOND_MODE_8023AD) {
1059                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1060                         }
1061
1062                         if ((bond->params.mode == BOND_MODE_TLB) ||
1063                             (bond->params.mode == BOND_MODE_ALB)) {
1064                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1065                         }
1066                 } else {
1067                         if (USES_PRIMARY(bond->params.mode)) {
1068                                 printk(KERN_INFO DRV_NAME
1069                                        ": %s: making interface %s the new "
1070                                        "active one.\n",
1071                                        bond->dev->name, new_active->dev->name);
1072                         }
1073                 }
1074         }
1075
1076         if (USES_PRIMARY(bond->params.mode)) {
1077                 bond_mc_swap(bond, new_active, old_active);
1078         }
1079
1080         if ((bond->params.mode == BOND_MODE_TLB) ||
1081             (bond->params.mode == BOND_MODE_ALB)) {
1082                 bond_alb_handle_active_change(bond, new_active);
1083                 if (old_active)
1084                         bond_set_slave_inactive_flags(old_active);
1085                 if (new_active)
1086                         bond_set_slave_active_flags(new_active);
1087         } else {
1088                 bond->curr_active_slave = new_active;
1089         }
1090
1091         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1092                 if (old_active) {
1093                         bond_set_slave_inactive_flags(old_active);
1094                 }
1095
1096                 if (new_active) {
1097                         bond_set_slave_active_flags(new_active);
1098                 }
1099
1100                 /* when bonding does not set the slave MAC address, the bond MAC
1101                  * address is the one of the active slave.
1102                  */
1103                 if (new_active && !bond->do_set_mac_addr)
1104                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1105                                 new_active->dev->addr_len);
1106
1107                 bond_send_gratuitous_arp(bond);
1108         }
1109 }
1110
1111 /**
1112  * bond_select_active_slave - select a new active slave, if needed
1113  * @bond: our bonding struct
1114  *
1115  * This functions shoud be called when one of the following occurs:
1116  * - The old curr_active_slave has been released or lost its link.
1117  * - The primary_slave has got its link back.
1118  * - A slave has got its link back and there's no old curr_active_slave.
1119  *
1120  * Warning: Caller must hold curr_slave_lock for writing.
1121  */
1122 void bond_select_active_slave(struct bonding *bond)
1123 {
1124         struct slave *best_slave;
1125         int rv;
1126
1127         best_slave = bond_find_best_slave(bond);
1128         if (best_slave != bond->curr_active_slave) {
1129                 bond_change_active_slave(bond, best_slave);
1130                 rv = bond_set_carrier(bond);
1131                 if (!rv)
1132                         return;
1133
1134                 if (netif_carrier_ok(bond->dev)) {
1135                         printk(KERN_INFO DRV_NAME
1136                                ": %s: first active interface up!\n",
1137                                bond->dev->name);
1138                 } else {
1139                         printk(KERN_INFO DRV_NAME ": %s: "
1140                                "now running without any active interface !\n",
1141                                bond->dev->name);
1142                 }
1143         }
1144 }
1145
1146 /*--------------------------- slave list handling ---------------------------*/
1147
1148 /*
1149  * This function attaches the slave to the end of list.
1150  *
1151  * bond->lock held for writing by caller.
1152  */
1153 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1154 {
1155         if (bond->first_slave == NULL) { /* attaching the first slave */
1156                 new_slave->next = new_slave;
1157                 new_slave->prev = new_slave;
1158                 bond->first_slave = new_slave;
1159         } else {
1160                 new_slave->next = bond->first_slave;
1161                 new_slave->prev = bond->first_slave->prev;
1162                 new_slave->next->prev = new_slave;
1163                 new_slave->prev->next = new_slave;
1164         }
1165
1166         bond->slave_cnt++;
1167 }
1168
1169 /*
1170  * This function detaches the slave from the list.
1171  * WARNING: no check is made to verify if the slave effectively
1172  * belongs to <bond>.
1173  * Nothing is freed on return, structures are just unchained.
1174  * If any slave pointer in bond was pointing to <slave>,
1175  * it should be changed by the calling function.
1176  *
1177  * bond->lock held for writing by caller.
1178  */
1179 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1180 {
1181         if (slave->next) {
1182                 slave->next->prev = slave->prev;
1183         }
1184
1185         if (slave->prev) {
1186                 slave->prev->next = slave->next;
1187         }
1188
1189         if (bond->first_slave == slave) { /* slave is the first slave */
1190                 if (bond->slave_cnt > 1) { /* there are more slave */
1191                         bond->first_slave = slave->next;
1192                 } else {
1193                         bond->first_slave = NULL; /* slave was the last one */
1194                 }
1195         }
1196
1197         slave->next = NULL;
1198         slave->prev = NULL;
1199         bond->slave_cnt--;
1200 }
1201
1202 /*---------------------------------- IOCTL ----------------------------------*/
1203
1204 static int bond_sethwaddr(struct net_device *bond_dev,
1205                           struct net_device *slave_dev)
1206 {
1207         dprintk("bond_dev=%p\n", bond_dev);
1208         dprintk("slave_dev=%p\n", slave_dev);
1209         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1210         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1211         return 0;
1212 }
1213
1214 #define BOND_VLAN_FEATURES \
1215         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1216          NETIF_F_HW_VLAN_FILTER)
1217
1218 /* 
1219  * Compute the common dev->feature set available to all slaves.  Some
1220  * feature bits are managed elsewhere, so preserve those feature bits
1221  * on the master device.
1222  */
1223 static int bond_compute_features(struct bonding *bond)
1224 {
1225         struct slave *slave;
1226         struct net_device *bond_dev = bond->dev;
1227         unsigned long features = bond_dev->features;
1228         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1229                                                 bond_dev->hard_header_len);
1230         int i;
1231
1232         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1233         features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1234                     NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1235
1236         bond_for_each_slave(bond, slave, i) {
1237                 features = netdev_compute_features(features,
1238                                                    slave->dev->features);
1239                 if (slave->dev->hard_header_len > max_hard_header_len)
1240                         max_hard_header_len = slave->dev->hard_header_len;
1241         }
1242
1243         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1244         bond_dev->features = features;
1245         bond_dev->hard_header_len = max_hard_header_len;
1246
1247         return 0;
1248 }
1249
1250
1251 static void bond_setup_by_slave(struct net_device *bond_dev,
1252                                 struct net_device *slave_dev)
1253 {
1254         bond_dev->neigh_setup           = slave_dev->neigh_setup;
1255
1256         bond_dev->type              = slave_dev->type;
1257         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1258         bond_dev->addr_len          = slave_dev->addr_len;
1259
1260         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1261                 slave_dev->addr_len);
1262 }
1263
1264 /* enslave device <slave> to bond device <master> */
1265 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1266 {
1267         struct bonding *bond = bond_dev->priv;
1268         struct slave *new_slave = NULL;
1269         struct dev_mc_list *dmi;
1270         struct sockaddr addr;
1271         int link_reporting;
1272         int old_features = bond_dev->features;
1273         int res = 0;
1274
1275         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1276                 slave_dev->do_ioctl == NULL) {
1277                 printk(KERN_WARNING DRV_NAME
1278                        ": %s: Warning: no link monitoring support for %s\n",
1279                        bond_dev->name, slave_dev->name);
1280         }
1281
1282         /* bond must be initialized by bond_open() before enslaving */
1283         if (!(bond_dev->flags & IFF_UP)) {
1284                 printk(KERN_WARNING DRV_NAME
1285                         " %s: master_dev is not up in bond_enslave\n",
1286                         bond_dev->name);
1287         }
1288
1289         /* already enslaved */
1290         if (slave_dev->flags & IFF_SLAVE) {
1291                 dprintk("Error, Device was already enslaved\n");
1292                 return -EBUSY;
1293         }
1294
1295         /* vlan challenged mutual exclusion */
1296         /* no need to lock since we're protected by rtnl_lock */
1297         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1298                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1299                 if (!list_empty(&bond->vlan_list)) {
1300                         printk(KERN_ERR DRV_NAME
1301                                ": %s: Error: cannot enslave VLAN "
1302                                "challenged slave %s on VLAN enabled "
1303                                "bond %s\n", bond_dev->name, slave_dev->name,
1304                                bond_dev->name);
1305                         return -EPERM;
1306                 } else {
1307                         printk(KERN_WARNING DRV_NAME
1308                                ": %s: Warning: enslaved VLAN challenged "
1309                                "slave %s. Adding VLANs will be blocked as "
1310                                "long as %s is part of bond %s\n",
1311                                bond_dev->name, slave_dev->name, slave_dev->name,
1312                                bond_dev->name);
1313                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1314                 }
1315         } else {
1316                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1317                 if (bond->slave_cnt == 0) {
1318                         /* First slave, and it is not VLAN challenged,
1319                          * so remove the block of adding VLANs over the bond.
1320                          */
1321                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1322                 }
1323         }
1324
1325         /*
1326          * Old ifenslave binaries are no longer supported.  These can
1327          * be identified with moderate accurary by the state of the slave:
1328          * the current ifenslave will set the interface down prior to
1329          * enslaving it; the old ifenslave will not.
1330          */
1331         if ((slave_dev->flags & IFF_UP)) {
1332                 printk(KERN_ERR DRV_NAME ": %s is up. "
1333                        "This may be due to an out of date ifenslave.\n",
1334                        slave_dev->name);
1335                 res = -EPERM;
1336                 goto err_undo_flags;
1337         }
1338
1339         /* set bonding device ether type by slave - bonding netdevices are
1340          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1341          * there is a need to override some of the type dependent attribs/funcs.
1342          *
1343          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1344          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1345          */
1346         if (bond->slave_cnt == 0) {
1347                 if (slave_dev->type != ARPHRD_ETHER)
1348                         bond_setup_by_slave(bond_dev, slave_dev);
1349         } else if (bond_dev->type != slave_dev->type) {
1350                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1351                         "from other slaves (%d), can not enslave it.\n",
1352                         slave_dev->name,
1353                         slave_dev->type, bond_dev->type);
1354                         res = -EINVAL;
1355                         goto err_undo_flags;
1356         }
1357
1358         if (slave_dev->set_mac_address == NULL) {
1359                 if (bond->slave_cnt == 0) {
1360                         printk(KERN_WARNING DRV_NAME
1361                                 ": %s: Warning: The first slave device you "
1362                                 "specified does not support setting the MAC "
1363                                 "address. This bond MAC address would be that "
1364                                 "of the active slave.\n", bond_dev->name);
1365                         bond->do_set_mac_addr = 0;
1366                 } else if (bond->do_set_mac_addr) {
1367                         printk(KERN_ERR DRV_NAME
1368                                 ": %s: Error: The slave device you specified "
1369                                 "does not support setting the MAC addres,."
1370                                 "but this bond uses this practice. \n"
1371                                 , bond_dev->name);
1372                         res = -EOPNOTSUPP;
1373                         goto err_undo_flags;
1374                 }
1375         }
1376
1377         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1378         if (!new_slave) {
1379                 res = -ENOMEM;
1380                 goto err_undo_flags;
1381         }
1382
1383         /* save slave's original flags before calling
1384          * netdev_set_master and dev_open
1385          */
1386         new_slave->original_flags = slave_dev->flags;
1387
1388         /*
1389          * Save slave's original ("permanent") mac address for modes
1390          * that need it, and for restoring it upon release, and then
1391          * set it to the master's address
1392          */
1393         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1394
1395         if (bond->do_set_mac_addr) {
1396                 /*
1397                  * Set slave to master's mac address.  The application already
1398                  * set the master's mac address to that of the first slave
1399                  */
1400                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1401                 addr.sa_family = slave_dev->type;
1402                 res = dev_set_mac_address(slave_dev, &addr);
1403                 if (res) {
1404                         dprintk("Error %d calling set_mac_address\n", res);
1405                         goto err_free;
1406                 }
1407         }
1408
1409         res = netdev_set_master(slave_dev, bond_dev);
1410         if (res) {
1411                 dprintk("Error %d calling netdev_set_master\n", res);
1412                 goto err_close;
1413         }
1414         /* open the slave since the application closed it */
1415         res = dev_open(slave_dev);
1416         if (res) {
1417                 dprintk("Openning slave %s failed\n", slave_dev->name);
1418                 goto err_restore_mac;
1419         }
1420
1421         new_slave->dev = slave_dev;
1422         slave_dev->priv_flags |= IFF_BONDING;
1423
1424         if ((bond->params.mode == BOND_MODE_TLB) ||
1425             (bond->params.mode == BOND_MODE_ALB)) {
1426                 /* bond_alb_init_slave() must be called before all other stages since
1427                  * it might fail and we do not want to have to undo everything
1428                  */
1429                 res = bond_alb_init_slave(bond, new_slave);
1430                 if (res) {
1431                         goto err_unset_master;
1432                 }
1433         }
1434
1435         /* If the mode USES_PRIMARY, then the new slave gets the
1436          * master's promisc (and mc) settings only if it becomes the
1437          * curr_active_slave, and that is taken care of later when calling
1438          * bond_change_active()
1439          */
1440         if (!USES_PRIMARY(bond->params.mode)) {
1441                 /* set promiscuity level to new slave */
1442                 if (bond_dev->flags & IFF_PROMISC) {
1443                         dev_set_promiscuity(slave_dev, 1);
1444                 }
1445
1446                 /* set allmulti level to new slave */
1447                 if (bond_dev->flags & IFF_ALLMULTI) {
1448                         dev_set_allmulti(slave_dev, 1);
1449                 }
1450
1451                 /* upload master's mc_list to new slave */
1452                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1453                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1454                 }
1455         }
1456
1457         if (bond->params.mode == BOND_MODE_8023AD) {
1458                 /* add lacpdu mc addr to mc list */
1459                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1460
1461                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1462         }
1463
1464         bond_add_vlans_on_slave(bond, slave_dev);
1465
1466         write_lock_bh(&bond->lock);
1467
1468         bond_attach_slave(bond, new_slave);
1469
1470         new_slave->delay = 0;
1471         new_slave->link_failure_count = 0;
1472
1473         bond_compute_features(bond);
1474
1475         new_slave->last_arp_rx = jiffies;
1476
1477         if (bond->params.miimon && !bond->params.use_carrier) {
1478                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1479
1480                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1481                         /*
1482                          * miimon is set but a bonded network driver
1483                          * does not support ETHTOOL/MII and
1484                          * arp_interval is not set.  Note: if
1485                          * use_carrier is enabled, we will never go
1486                          * here (because netif_carrier is always
1487                          * supported); thus, we don't need to change
1488                          * the messages for netif_carrier.
1489                          */
1490                         printk(KERN_WARNING DRV_NAME
1491                                ": %s: Warning: MII and ETHTOOL support not "
1492                                "available for interface %s, and "
1493                                "arp_interval/arp_ip_target module parameters "
1494                                "not specified, thus bonding will not detect "
1495                                "link failures! see bonding.txt for details.\n",
1496                                bond_dev->name, slave_dev->name);
1497                 } else if (link_reporting == -1) {
1498                         /* unable get link status using mii/ethtool */
1499                         printk(KERN_WARNING DRV_NAME
1500                                ": %s: Warning: can't get link status from "
1501                                "interface %s; the network driver associated "
1502                                "with this interface does not support MII or "
1503                                "ETHTOOL link status reporting, thus miimon "
1504                                "has no effect on this interface.\n",
1505                                bond_dev->name, slave_dev->name);
1506                 }
1507         }
1508
1509         /* check for initial state */
1510         if (!bond->params.miimon ||
1511             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1512                 if (bond->params.updelay) {
1513                         dprintk("Initial state of slave_dev is "
1514                                 "BOND_LINK_BACK\n");
1515                         new_slave->link  = BOND_LINK_BACK;
1516                         new_slave->delay = bond->params.updelay;
1517                 } else {
1518                         dprintk("Initial state of slave_dev is "
1519                                 "BOND_LINK_UP\n");
1520                         new_slave->link  = BOND_LINK_UP;
1521                 }
1522                 new_slave->jiffies = jiffies;
1523         } else {
1524                 dprintk("Initial state of slave_dev is "
1525                         "BOND_LINK_DOWN\n");
1526                 new_slave->link  = BOND_LINK_DOWN;
1527         }
1528
1529         if (bond_update_speed_duplex(new_slave) &&
1530             (new_slave->link != BOND_LINK_DOWN)) {
1531                 printk(KERN_WARNING DRV_NAME
1532                        ": %s: Warning: failed to get speed and duplex from %s, "
1533                        "assumed to be 100Mb/sec and Full.\n",
1534                        bond_dev->name, new_slave->dev->name);
1535
1536                 if (bond->params.mode == BOND_MODE_8023AD) {
1537                         printk(KERN_WARNING DRV_NAME
1538                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1539                                "support in base driver for proper aggregator "
1540                                "selection.\n", bond_dev->name);
1541                 }
1542         }
1543
1544         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1545                 /* if there is a primary slave, remember it */
1546                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1547                         bond->primary_slave = new_slave;
1548                 }
1549         }
1550
1551         switch (bond->params.mode) {
1552         case BOND_MODE_ACTIVEBACKUP:
1553                 bond_set_slave_inactive_flags(new_slave);
1554                 bond_select_active_slave(bond);
1555                 break;
1556         case BOND_MODE_8023AD:
1557                 /* in 802.3ad mode, the internal mechanism
1558                  * will activate the slaves in the selected
1559                  * aggregator
1560                  */
1561                 bond_set_slave_inactive_flags(new_slave);
1562                 /* if this is the first slave */
1563                 if (bond->slave_cnt == 1) {
1564                         SLAVE_AD_INFO(new_slave).id = 1;
1565                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1566                          * can be called only after the mac address of the bond is set
1567                          */
1568                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1569                                             bond->params.lacp_fast);
1570                 } else {
1571                         SLAVE_AD_INFO(new_slave).id =
1572                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1573                 }
1574
1575                 bond_3ad_bind_slave(new_slave);
1576                 break;
1577         case BOND_MODE_TLB:
1578         case BOND_MODE_ALB:
1579                 new_slave->state = BOND_STATE_ACTIVE;
1580                 if ((!bond->curr_active_slave) &&
1581                     (new_slave->link != BOND_LINK_DOWN)) {
1582                         /* first slave or no active slave yet, and this link
1583                          * is OK, so make this interface the active one
1584                          */
1585                         bond_change_active_slave(bond, new_slave);
1586                 } else {
1587                         bond_set_slave_inactive_flags(new_slave);
1588                 }
1589                 break;
1590         default:
1591                 dprintk("This slave is always active in trunk mode\n");
1592
1593                 /* always active in trunk mode */
1594                 new_slave->state = BOND_STATE_ACTIVE;
1595
1596                 /* In trunking mode there is little meaning to curr_active_slave
1597                  * anyway (it holds no special properties of the bond device),
1598                  * so we can change it without calling change_active_interface()
1599                  */
1600                 if (!bond->curr_active_slave) {
1601                         bond->curr_active_slave = new_slave;
1602                 }
1603                 break;
1604         } /* switch(bond_mode) */
1605
1606         bond_set_carrier(bond);
1607
1608         write_unlock_bh(&bond->lock);
1609
1610         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1611         if (res)
1612                 goto err_unset_master;
1613
1614         printk(KERN_INFO DRV_NAME
1615                ": %s: enslaving %s as a%s interface with a%s link.\n",
1616                bond_dev->name, slave_dev->name,
1617                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1618                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1619
1620         /* enslave is successful */
1621         return 0;
1622
1623 /* Undo stages on error */
1624 err_unset_master:
1625         netdev_set_master(slave_dev, NULL);
1626
1627 err_close:
1628         dev_close(slave_dev);
1629
1630 err_restore_mac:
1631         if (bond->do_set_mac_addr) {
1632                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1633                 addr.sa_family = slave_dev->type;
1634                 dev_set_mac_address(slave_dev, &addr);
1635         }
1636
1637 err_free:
1638         kfree(new_slave);
1639
1640 err_undo_flags:
1641         bond_dev->features = old_features;
1642  
1643         return res;
1644 }
1645
1646 /*
1647  * Try to release the slave device <slave> from the bond device <master>
1648  * It is legal to access curr_active_slave without a lock because all the function
1649  * is write-locked.
1650  *
1651  * The rules for slave state should be:
1652  *   for Active/Backup:
1653  *     Active stays on all backups go down
1654  *   for Bonded connections:
1655  *     The first up interface should be left on and all others downed.
1656  */
1657 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1658 {
1659         struct bonding *bond = bond_dev->priv;
1660         struct slave *slave, *oldcurrent;
1661         struct sockaddr addr;
1662         int mac_addr_differ;
1663         DECLARE_MAC_BUF(mac);
1664
1665         /* slave is not a slave or master is not master of this slave */
1666         if (!(slave_dev->flags & IFF_SLAVE) ||
1667             (slave_dev->master != bond_dev)) {
1668                 printk(KERN_ERR DRV_NAME
1669                        ": %s: Error: cannot release %s.\n",
1670                        bond_dev->name, slave_dev->name);
1671                 return -EINVAL;
1672         }
1673
1674         write_lock_bh(&bond->lock);
1675
1676         slave = bond_get_slave_by_dev(bond, slave_dev);
1677         if (!slave) {
1678                 /* not a slave of this bond */
1679                 printk(KERN_INFO DRV_NAME
1680                        ": %s: %s not enslaved\n",
1681                        bond_dev->name, slave_dev->name);
1682                 write_unlock_bh(&bond->lock);
1683                 return -EINVAL;
1684         }
1685
1686         mac_addr_differ = memcmp(bond_dev->dev_addr,
1687                                  slave->perm_hwaddr,
1688                                  ETH_ALEN);
1689         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1690                 printk(KERN_WARNING DRV_NAME
1691                        ": %s: Warning: the permanent HWaddr of %s - "
1692                        "%s - is still in use by %s. "
1693                        "Set the HWaddr of %s to a different address "
1694                        "to avoid conflicts.\n",
1695                        bond_dev->name,
1696                        slave_dev->name,
1697                        print_mac(mac, slave->perm_hwaddr),
1698                        bond_dev->name,
1699                        slave_dev->name);
1700         }
1701
1702         /* Inform AD package of unbinding of slave. */
1703         if (bond->params.mode == BOND_MODE_8023AD) {
1704                 /* must be called before the slave is
1705                  * detached from the list
1706                  */
1707                 bond_3ad_unbind_slave(slave);
1708         }
1709
1710         printk(KERN_INFO DRV_NAME
1711                ": %s: releasing %s interface %s\n",
1712                bond_dev->name,
1713                (slave->state == BOND_STATE_ACTIVE)
1714                ? "active" : "backup",
1715                slave_dev->name);
1716
1717         oldcurrent = bond->curr_active_slave;
1718
1719         bond->current_arp_slave = NULL;
1720
1721         /* release the slave from its bond */
1722         bond_detach_slave(bond, slave);
1723
1724         bond_compute_features(bond);
1725
1726         if (bond->primary_slave == slave) {
1727                 bond->primary_slave = NULL;
1728         }
1729
1730         if (oldcurrent == slave) {
1731                 bond_change_active_slave(bond, NULL);
1732         }
1733
1734         if ((bond->params.mode == BOND_MODE_TLB) ||
1735             (bond->params.mode == BOND_MODE_ALB)) {
1736                 /* Must be called only after the slave has been
1737                  * detached from the list and the curr_active_slave
1738                  * has been cleared (if our_slave == old_current),
1739                  * but before a new active slave is selected.
1740                  */
1741                 bond_alb_deinit_slave(bond, slave);
1742         }
1743
1744         if (oldcurrent == slave)
1745                 bond_select_active_slave(bond);
1746
1747         if (bond->slave_cnt == 0) {
1748                 bond_set_carrier(bond);
1749
1750                 /* if the last slave was removed, zero the mac address
1751                  * of the master so it will be set by the application
1752                  * to the mac address of the first slave
1753                  */
1754                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1755
1756                 if (list_empty(&bond->vlan_list)) {
1757                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1758                 } else {
1759                         printk(KERN_WARNING DRV_NAME
1760                                ": %s: Warning: clearing HW address of %s while it "
1761                                "still has VLANs.\n",
1762                                bond_dev->name, bond_dev->name);
1763                         printk(KERN_WARNING DRV_NAME
1764                                ": %s: When re-adding slaves, make sure the bond's "
1765                                "HW address matches its VLANs'.\n",
1766                                bond_dev->name);
1767                 }
1768         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1769                    !bond_has_challenged_slaves(bond)) {
1770                 printk(KERN_INFO DRV_NAME
1771                        ": %s: last VLAN challenged slave %s "
1772                        "left bond %s. VLAN blocking is removed\n",
1773                        bond_dev->name, slave_dev->name, bond_dev->name);
1774                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1775         }
1776
1777         write_unlock_bh(&bond->lock);
1778
1779         /* must do this from outside any spinlocks */
1780         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1781
1782         bond_del_vlans_from_slave(bond, slave_dev);
1783
1784         /* If the mode USES_PRIMARY, then we should only remove its
1785          * promisc and mc settings if it was the curr_active_slave, but that was
1786          * already taken care of above when we detached the slave
1787          */
1788         if (!USES_PRIMARY(bond->params.mode)) {
1789                 /* unset promiscuity level from slave */
1790                 if (bond_dev->flags & IFF_PROMISC) {
1791                         dev_set_promiscuity(slave_dev, -1);
1792                 }
1793
1794                 /* unset allmulti level from slave */
1795                 if (bond_dev->flags & IFF_ALLMULTI) {
1796                         dev_set_allmulti(slave_dev, -1);
1797                 }
1798
1799                 /* flush master's mc_list from slave */
1800                 bond_mc_list_flush(bond_dev, slave_dev);
1801         }
1802
1803         netdev_set_master(slave_dev, NULL);
1804
1805         /* close slave before restoring its mac address */
1806         dev_close(slave_dev);
1807
1808         if (bond->do_set_mac_addr) {
1809                 /* restore original ("permanent") mac address */
1810                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1811                 addr.sa_family = slave_dev->type;
1812                 dev_set_mac_address(slave_dev, &addr);
1813         }
1814
1815         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1816                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1817                                    IFF_SLAVE_NEEDARP);
1818
1819         kfree(slave);
1820
1821         return 0;  /* deletion OK */
1822 }
1823
1824 /*
1825  * This function releases all slaves.
1826  */
1827 static int bond_release_all(struct net_device *bond_dev)
1828 {
1829         struct bonding *bond = bond_dev->priv;
1830         struct slave *slave;
1831         struct net_device *slave_dev;
1832         struct sockaddr addr;
1833
1834         write_lock_bh(&bond->lock);
1835
1836         netif_carrier_off(bond_dev);
1837
1838         if (bond->slave_cnt == 0) {
1839                 goto out;
1840         }
1841
1842         bond->current_arp_slave = NULL;
1843         bond->primary_slave = NULL;
1844         bond_change_active_slave(bond, NULL);
1845
1846         while ((slave = bond->first_slave) != NULL) {
1847                 /* Inform AD package of unbinding of slave
1848                  * before slave is detached from the list.
1849                  */
1850                 if (bond->params.mode == BOND_MODE_8023AD) {
1851                         bond_3ad_unbind_slave(slave);
1852                 }
1853
1854                 slave_dev = slave->dev;
1855                 bond_detach_slave(bond, slave);
1856
1857                 if ((bond->params.mode == BOND_MODE_TLB) ||
1858                     (bond->params.mode == BOND_MODE_ALB)) {
1859                         /* must be called only after the slave
1860                          * has been detached from the list
1861                          */
1862                         bond_alb_deinit_slave(bond, slave);
1863                 }
1864
1865                 bond_compute_features(bond);
1866
1867                 /* now that the slave is detached, unlock and perform
1868                  * all the undo steps that should not be called from
1869                  * within a lock.
1870                  */
1871                 write_unlock_bh(&bond->lock);
1872
1873                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1874                 bond_del_vlans_from_slave(bond, slave_dev);
1875
1876                 /* If the mode USES_PRIMARY, then we should only remove its
1877                  * promisc and mc settings if it was the curr_active_slave, but that was
1878                  * already taken care of above when we detached the slave
1879                  */
1880                 if (!USES_PRIMARY(bond->params.mode)) {
1881                         /* unset promiscuity level from slave */
1882                         if (bond_dev->flags & IFF_PROMISC) {
1883                                 dev_set_promiscuity(slave_dev, -1);
1884                         }
1885
1886                         /* unset allmulti level from slave */
1887                         if (bond_dev->flags & IFF_ALLMULTI) {
1888                                 dev_set_allmulti(slave_dev, -1);
1889                         }
1890
1891                         /* flush master's mc_list from slave */
1892                         bond_mc_list_flush(bond_dev, slave_dev);
1893                 }
1894
1895                 netdev_set_master(slave_dev, NULL);
1896
1897                 /* close slave before restoring its mac address */
1898                 dev_close(slave_dev);
1899
1900                 if (bond->do_set_mac_addr) {
1901                         /* restore original ("permanent") mac address*/
1902                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1903                         addr.sa_family = slave_dev->type;
1904                         dev_set_mac_address(slave_dev, &addr);
1905                 }
1906
1907                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1908                                            IFF_SLAVE_INACTIVE);
1909
1910                 kfree(slave);
1911
1912                 /* re-acquire the lock before getting the next slave */
1913                 write_lock_bh(&bond->lock);
1914         }
1915
1916         /* zero the mac address of the master so it will be
1917          * set by the application to the mac address of the
1918          * first slave
1919          */
1920         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1921
1922         if (list_empty(&bond->vlan_list)) {
1923                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1924         } else {
1925                 printk(KERN_WARNING DRV_NAME
1926                        ": %s: Warning: clearing HW address of %s while it "
1927                        "still has VLANs.\n",
1928                        bond_dev->name, bond_dev->name);
1929                 printk(KERN_WARNING DRV_NAME
1930                        ": %s: When re-adding slaves, make sure the bond's "
1931                        "HW address matches its VLANs'.\n",
1932                        bond_dev->name);
1933         }
1934
1935         printk(KERN_INFO DRV_NAME
1936                ": %s: released all slaves\n",
1937                bond_dev->name);
1938
1939 out:
1940         write_unlock_bh(&bond->lock);
1941
1942         return 0;
1943 }
1944
1945 /*
1946  * This function changes the active slave to slave <slave_dev>.
1947  * It returns -EINVAL in the following cases.
1948  *  - <slave_dev> is not found in the list.
1949  *  - There is not active slave now.
1950  *  - <slave_dev> is already active.
1951  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1952  *  - <slave_dev> is not running.
1953  * In these cases, this fuction does nothing.
1954  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1955  */
1956 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1957 {
1958         struct bonding *bond = bond_dev->priv;
1959         struct slave *old_active = NULL;
1960         struct slave *new_active = NULL;
1961         int res = 0;
1962
1963         if (!USES_PRIMARY(bond->params.mode)) {
1964                 return -EINVAL;
1965         }
1966
1967         /* Verify that master_dev is indeed the master of slave_dev */
1968         if (!(slave_dev->flags & IFF_SLAVE) ||
1969             (slave_dev->master != bond_dev)) {
1970                 return -EINVAL;
1971         }
1972
1973         write_lock_bh(&bond->lock);
1974
1975         old_active = bond->curr_active_slave;
1976         new_active = bond_get_slave_by_dev(bond, slave_dev);
1977
1978         /*
1979          * Changing to the current active: do nothing; return success.
1980          */
1981         if (new_active && (new_active == old_active)) {
1982                 write_unlock_bh(&bond->lock);
1983                 return 0;
1984         }
1985
1986         if ((new_active) &&
1987             (old_active) &&
1988             (new_active->link == BOND_LINK_UP) &&
1989             IS_UP(new_active->dev)) {
1990                 bond_change_active_slave(bond, new_active);
1991         } else {
1992                 res = -EINVAL;
1993         }
1994
1995         write_unlock_bh(&bond->lock);
1996
1997         return res;
1998 }
1999
2000 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2001 {
2002         struct bonding *bond = bond_dev->priv;
2003
2004         info->bond_mode = bond->params.mode;
2005         info->miimon = bond->params.miimon;
2006
2007         read_lock_bh(&bond->lock);
2008         info->num_slaves = bond->slave_cnt;
2009         read_unlock_bh(&bond->lock);
2010
2011         return 0;
2012 }
2013
2014 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2015 {
2016         struct bonding *bond = bond_dev->priv;
2017         struct slave *slave;
2018         int i, found = 0;
2019
2020         if (info->slave_id < 0) {
2021                 return -ENODEV;
2022         }
2023
2024         read_lock_bh(&bond->lock);
2025
2026         bond_for_each_slave(bond, slave, i) {
2027                 if (i == (int)info->slave_id) {
2028                         found = 1;
2029                         break;
2030                 }
2031         }
2032
2033         read_unlock_bh(&bond->lock);
2034
2035         if (found) {
2036                 strcpy(info->slave_name, slave->dev->name);
2037                 info->link = slave->link;
2038                 info->state = slave->state;
2039                 info->link_failure_count = slave->link_failure_count;
2040         } else {
2041                 return -ENODEV;
2042         }
2043
2044         return 0;
2045 }
2046
2047 /*-------------------------------- Monitoring -------------------------------*/
2048
2049 /* this function is called regularly to monitor each slave's link. */
2050 void bond_mii_monitor(struct net_device *bond_dev)
2051 {
2052         struct bonding *bond = bond_dev->priv;
2053         struct slave *slave, *oldcurrent;
2054         int do_failover = 0;
2055         int delta_in_ticks;
2056         int i;
2057
2058         read_lock(&bond->lock);
2059
2060         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2061
2062         if (bond->kill_timers) {
2063                 goto out;
2064         }
2065
2066         if (bond->slave_cnt == 0) {
2067                 goto re_arm;
2068         }
2069
2070         /* we will try to read the link status of each of our slaves, and
2071          * set their IFF_RUNNING flag appropriately. For each slave not
2072          * supporting MII status, we won't do anything so that a user-space
2073          * program could monitor the link itself if needed.
2074          */
2075
2076         read_lock(&bond->curr_slave_lock);
2077         oldcurrent = bond->curr_active_slave;
2078         read_unlock(&bond->curr_slave_lock);
2079
2080         bond_for_each_slave(bond, slave, i) {
2081                 struct net_device *slave_dev = slave->dev;
2082                 int link_state;
2083                 u16 old_speed = slave->speed;
2084                 u8 old_duplex = slave->duplex;
2085
2086                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2087
2088                 switch (slave->link) {
2089                 case BOND_LINK_UP:      /* the link was up */
2090                         if (link_state == BMSR_LSTATUS) {
2091                                 /* link stays up, nothing more to do */
2092                                 break;
2093                         } else { /* link going down */
2094                                 slave->link  = BOND_LINK_FAIL;
2095                                 slave->delay = bond->params.downdelay;
2096
2097                                 if (slave->link_failure_count < UINT_MAX) {
2098                                         slave->link_failure_count++;
2099                                 }
2100
2101                                 if (bond->params.downdelay) {
2102                                         printk(KERN_INFO DRV_NAME
2103                                                ": %s: link status down for %s "
2104                                                "interface %s, disabling it in "
2105                                                "%d ms.\n",
2106                                                bond_dev->name,
2107                                                IS_UP(slave_dev)
2108                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2109                                                   ? ((slave == oldcurrent)
2110                                                      ? "active " : "backup ")
2111                                                   : "")
2112                                                : "idle ",
2113                                                slave_dev->name,
2114                                                bond->params.downdelay * bond->params.miimon);
2115                                 }
2116                         }
2117                         /* no break ! fall through the BOND_LINK_FAIL test to
2118                            ensure proper action to be taken
2119                         */
2120                 case BOND_LINK_FAIL:    /* the link has just gone down */
2121                         if (link_state != BMSR_LSTATUS) {
2122                                 /* link stays down */
2123                                 if (slave->delay <= 0) {
2124                                         /* link down for too long time */
2125                                         slave->link = BOND_LINK_DOWN;
2126
2127                                         /* in active/backup mode, we must
2128                                          * completely disable this interface
2129                                          */
2130                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2131                                             (bond->params.mode == BOND_MODE_8023AD)) {
2132                                                 bond_set_slave_inactive_flags(slave);
2133                                         }
2134
2135                                         printk(KERN_INFO DRV_NAME
2136                                                ": %s: link status definitely "
2137                                                "down for interface %s, "
2138                                                "disabling it\n",
2139                                                bond_dev->name,
2140                                                slave_dev->name);
2141
2142                                         /* notify ad that the link status has changed */
2143                                         if (bond->params.mode == BOND_MODE_8023AD) {
2144                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2145                                         }
2146
2147                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2148                                             (bond->params.mode == BOND_MODE_ALB)) {
2149                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2150                                         }
2151
2152                                         if (slave == oldcurrent) {
2153                                                 do_failover = 1;
2154                                         }
2155                                 } else {
2156                                         slave->delay--;
2157                                 }
2158                         } else {
2159                                 /* link up again */
2160                                 slave->link  = BOND_LINK_UP;
2161                                 slave->jiffies = jiffies;
2162                                 printk(KERN_INFO DRV_NAME
2163                                        ": %s: link status up again after %d "
2164                                        "ms for interface %s.\n",
2165                                        bond_dev->name,
2166                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2167                                        slave_dev->name);
2168                         }
2169                         break;
2170                 case BOND_LINK_DOWN:    /* the link was down */
2171                         if (link_state != BMSR_LSTATUS) {
2172                                 /* the link stays down, nothing more to do */
2173                                 break;
2174                         } else {        /* link going up */
2175                                 slave->link  = BOND_LINK_BACK;
2176                                 slave->delay = bond->params.updelay;
2177
2178                                 if (bond->params.updelay) {
2179                                         /* if updelay == 0, no need to
2180                                            advertise about a 0 ms delay */
2181                                         printk(KERN_INFO DRV_NAME
2182                                                ": %s: link status up for "
2183                                                "interface %s, enabling it "
2184                                                "in %d ms.\n",
2185                                                bond_dev->name,
2186                                                slave_dev->name,
2187                                                bond->params.updelay * bond->params.miimon);
2188                                 }
2189                         }
2190                         /* no break ! fall through the BOND_LINK_BACK state in
2191                            case there's something to do.
2192                         */
2193                 case BOND_LINK_BACK:    /* the link has just come back */
2194                         if (link_state != BMSR_LSTATUS) {
2195                                 /* link down again */
2196                                 slave->link  = BOND_LINK_DOWN;
2197
2198                                 printk(KERN_INFO DRV_NAME
2199                                        ": %s: link status down again after %d "
2200                                        "ms for interface %s.\n",
2201                                        bond_dev->name,
2202                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2203                                        slave_dev->name);
2204                         } else {
2205                                 /* link stays up */
2206                                 if (slave->delay == 0) {
2207                                         /* now the link has been up for long time enough */
2208                                         slave->link = BOND_LINK_UP;
2209                                         slave->jiffies = jiffies;
2210
2211                                         if (bond->params.mode == BOND_MODE_8023AD) {
2212                                                 /* prevent it from being the active one */
2213                                                 slave->state = BOND_STATE_BACKUP;
2214                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2215                                                 /* make it immediately active */
2216                                                 slave->state = BOND_STATE_ACTIVE;
2217                                         } else if (slave != bond->primary_slave) {
2218                                                 /* prevent it from being the active one */
2219                                                 slave->state = BOND_STATE_BACKUP;
2220                                         }
2221
2222                                         printk(KERN_INFO DRV_NAME
2223                                                ": %s: link status definitely "
2224                                                "up for interface %s.\n",
2225                                                bond_dev->name,
2226                                                slave_dev->name);
2227
2228                                         /* notify ad that the link status has changed */
2229                                         if (bond->params.mode == BOND_MODE_8023AD) {
2230                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2231                                         }
2232
2233                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2234                                             (bond->params.mode == BOND_MODE_ALB)) {
2235                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2236                                         }
2237
2238                                         if ((!oldcurrent) ||
2239                                             (slave == bond->primary_slave)) {
2240                                                 do_failover = 1;
2241                                         }
2242                                 } else {
2243                                         slave->delay--;
2244                                 }
2245                         }
2246                         break;
2247                 default:
2248                         /* Should not happen */
2249                         printk(KERN_ERR DRV_NAME
2250                                ": %s: Error: %s Illegal value (link=%d)\n",
2251                                bond_dev->name,
2252                                slave->dev->name,
2253                                slave->link);
2254                         goto out;
2255                 } /* end of switch (slave->link) */
2256
2257                 bond_update_speed_duplex(slave);
2258
2259                 if (bond->params.mode == BOND_MODE_8023AD) {
2260                         if (old_speed != slave->speed) {
2261                                 bond_3ad_adapter_speed_changed(slave);
2262                         }
2263
2264                         if (old_duplex != slave->duplex) {
2265                                 bond_3ad_adapter_duplex_changed(slave);
2266                         }
2267                 }
2268
2269         } /* end of for */
2270
2271         if (do_failover) {
2272                 write_lock(&bond->curr_slave_lock);
2273
2274                 bond_select_active_slave(bond);
2275
2276                 write_unlock(&bond->curr_slave_lock);
2277         } else
2278                 bond_set_carrier(bond);
2279
2280 re_arm:
2281         if (bond->params.miimon) {
2282                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2283         }
2284 out:
2285         read_unlock(&bond->lock);
2286 }
2287
2288
2289 static __be32 bond_glean_dev_ip(struct net_device *dev)
2290 {
2291         struct in_device *idev;
2292         struct in_ifaddr *ifa;
2293         __be32 addr = 0;
2294
2295         if (!dev)
2296                 return 0;
2297
2298         rcu_read_lock();
2299         idev = __in_dev_get_rcu(dev);
2300         if (!idev)
2301                 goto out;
2302
2303         ifa = idev->ifa_list;
2304         if (!ifa)
2305                 goto out;
2306
2307         addr = ifa->ifa_local;
2308 out:
2309         rcu_read_unlock();
2310         return addr;
2311 }
2312
2313 static int bond_has_ip(struct bonding *bond)
2314 {
2315         struct vlan_entry *vlan, *vlan_next;
2316
2317         if (bond->master_ip)
2318                 return 1;
2319
2320         if (list_empty(&bond->vlan_list))
2321                 return 0;
2322
2323         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2324                                  vlan_list) {
2325                 if (vlan->vlan_ip)
2326                         return 1;
2327         }
2328
2329         return 0;
2330 }
2331
2332 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2333 {
2334         struct vlan_entry *vlan, *vlan_next;
2335
2336         if (ip == bond->master_ip)
2337                 return 1;
2338
2339         if (list_empty(&bond->vlan_list))
2340                 return 0;
2341
2342         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2343                                  vlan_list) {
2344                 if (ip == vlan->vlan_ip)
2345                         return 1;
2346         }
2347
2348         return 0;
2349 }
2350
2351 /*
2352  * We go to the (large) trouble of VLAN tagging ARP frames because
2353  * switches in VLAN mode (especially if ports are configured as
2354  * "native" to a VLAN) might not pass non-tagged frames.
2355  */
2356 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2357 {
2358         struct sk_buff *skb;
2359
2360         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2361                slave_dev->name, dest_ip, src_ip, vlan_id);
2362                
2363         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2364                          NULL, slave_dev->dev_addr, NULL);
2365
2366         if (!skb) {
2367                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2368                 return;
2369         }
2370         if (vlan_id) {
2371                 skb = vlan_put_tag(skb, vlan_id);
2372                 if (!skb) {
2373                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2374                         return;
2375                 }
2376         }
2377         arp_xmit(skb);
2378 }
2379
2380
2381 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2382 {
2383         int i, vlan_id, rv;
2384         __be32 *targets = bond->params.arp_targets;
2385         struct vlan_entry *vlan, *vlan_next;
2386         struct net_device *vlan_dev;
2387         struct flowi fl;
2388         struct rtable *rt;
2389
2390         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2391                 if (!targets[i])
2392                         continue;
2393                 dprintk("basa: target %x\n", targets[i]);
2394                 if (list_empty(&bond->vlan_list)) {
2395                         dprintk("basa: empty vlan: arp_send\n");
2396                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2397                                       bond->master_ip, 0);
2398                         continue;
2399                 }
2400
2401                 /*
2402                  * If VLANs are configured, we do a route lookup to
2403                  * determine which VLAN interface would be used, so we
2404                  * can tag the ARP with the proper VLAN tag.
2405                  */
2406                 memset(&fl, 0, sizeof(fl));
2407                 fl.fl4_dst = targets[i];
2408                 fl.fl4_tos = RTO_ONLINK;
2409
2410                 rv = ip_route_output_key(&rt, &fl);
2411                 if (rv) {
2412                         if (net_ratelimit()) {
2413                                 printk(KERN_WARNING DRV_NAME
2414                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2415                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2416                         }
2417                         continue;
2418                 }
2419
2420                 /*
2421                  * This target is not on a VLAN
2422                  */
2423                 if (rt->u.dst.dev == bond->dev) {
2424                         ip_rt_put(rt);
2425                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2426                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2427                                       bond->master_ip, 0);
2428                         continue;
2429                 }
2430
2431                 vlan_id = 0;
2432                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2433                                          vlan_list) {
2434                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2435                         if (vlan_dev == rt->u.dst.dev) {
2436                                 vlan_id = vlan->vlan_id;
2437                                 dprintk("basa: vlan match on %s %d\n",
2438                                        vlan_dev->name, vlan_id);
2439                                 break;
2440                         }
2441                 }
2442
2443                 if (vlan_id) {
2444                         ip_rt_put(rt);
2445                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2446                                       vlan->vlan_ip, vlan_id);
2447                         continue;
2448                 }
2449
2450                 if (net_ratelimit()) {
2451                         printk(KERN_WARNING DRV_NAME
2452                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2453                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2454                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2455                 }
2456                 ip_rt_put(rt);
2457         }
2458 }
2459
2460 /*
2461  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2462  * for each VLAN above us.
2463  */
2464 static void bond_send_gratuitous_arp(struct bonding *bond)
2465 {
2466         struct slave *slave = bond->curr_active_slave;
2467         struct vlan_entry *vlan;
2468         struct net_device *vlan_dev;
2469
2470         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2471                                 slave ? slave->dev->name : "NULL");
2472         if (!slave)
2473                 return;
2474
2475         if (bond->master_ip) {
2476                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2477                                   bond->master_ip, 0);
2478         }
2479
2480         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2481                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2482                 if (vlan->vlan_ip) {
2483                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2484                                       vlan->vlan_ip, vlan->vlan_id);
2485                 }
2486         }
2487 }
2488
2489 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2490 {
2491         int i;
2492         __be32 *targets = bond->params.arp_targets;
2493
2494         targets = bond->params.arp_targets;
2495         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2496                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2497                         "%u.%u.%u.%u bhti(tip) %d\n",
2498                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2499                        bond_has_this_ip(bond, tip));
2500                 if (sip == targets[i]) {
2501                         if (bond_has_this_ip(bond, tip))
2502                                 slave->last_arp_rx = jiffies;
2503                         return;
2504                 }
2505         }
2506 }
2507
2508 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2509 {
2510         struct arphdr *arp;
2511         struct slave *slave;
2512         struct bonding *bond;
2513         unsigned char *arp_ptr;
2514         __be32 sip, tip;
2515
2516         if (dev->nd_net != &init_net)
2517                 goto out;
2518
2519         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2520                 goto out;
2521
2522         bond = dev->priv;
2523         read_lock(&bond->lock);
2524
2525         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2526                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2527                 orig_dev ? orig_dev->name : "NULL");
2528
2529         slave = bond_get_slave_by_dev(bond, orig_dev);
2530         if (!slave || !slave_do_arp_validate(bond, slave))
2531                 goto out_unlock;
2532
2533         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2534         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2535                                  (2 * dev->addr_len) +
2536                                  (2 * sizeof(u32)))))
2537                 goto out_unlock;
2538
2539         arp = arp_hdr(skb);
2540         if (arp->ar_hln != dev->addr_len ||
2541             skb->pkt_type == PACKET_OTHERHOST ||
2542             skb->pkt_type == PACKET_LOOPBACK ||
2543             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2544             arp->ar_pro != htons(ETH_P_IP) ||
2545             arp->ar_pln != 4)
2546                 goto out_unlock;
2547
2548         arp_ptr = (unsigned char *)(arp + 1);
2549         arp_ptr += dev->addr_len;
2550         memcpy(&sip, arp_ptr, 4);
2551         arp_ptr += 4 + dev->addr_len;
2552         memcpy(&tip, arp_ptr, 4);
2553
2554         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2555                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2556                 slave->state, bond->params.arp_validate,
2557                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2558
2559         /*
2560          * Backup slaves won't see the ARP reply, but do come through
2561          * here for each ARP probe (so we swap the sip/tip to validate
2562          * the probe).  In a "redundant switch, common router" type of
2563          * configuration, the ARP probe will (hopefully) travel from
2564          * the active, through one switch, the router, then the other
2565          * switch before reaching the backup.
2566          */
2567         if (slave->state == BOND_STATE_ACTIVE)
2568                 bond_validate_arp(bond, slave, sip, tip);
2569         else
2570                 bond_validate_arp(bond, slave, tip, sip);
2571
2572 out_unlock:
2573         read_unlock(&bond->lock);
2574 out:
2575         dev_kfree_skb(skb);
2576         return NET_RX_SUCCESS;
2577 }
2578
2579 /*
2580  * this function is called regularly to monitor each slave's link
2581  * ensuring that traffic is being sent and received when arp monitoring
2582  * is used in load-balancing mode. if the adapter has been dormant, then an
2583  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2584  * arp monitoring in active backup mode.
2585  */
2586 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2587 {
2588         struct bonding *bond = bond_dev->priv;
2589         struct slave *slave, *oldcurrent;
2590         int do_failover = 0;
2591         int delta_in_ticks;
2592         int i;
2593
2594         read_lock(&bond->lock);
2595
2596         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2597
2598         if (bond->kill_timers) {
2599                 goto out;
2600         }
2601
2602         if (bond->slave_cnt == 0) {
2603                 goto re_arm;
2604         }
2605
2606         read_lock(&bond->curr_slave_lock);
2607         oldcurrent = bond->curr_active_slave;
2608         read_unlock(&bond->curr_slave_lock);
2609
2610         /* see if any of the previous devices are up now (i.e. they have
2611          * xmt and rcv traffic). the curr_active_slave does not come into
2612          * the picture unless it is null. also, slave->jiffies is not needed
2613          * here because we send an arp on each slave and give a slave as
2614          * long as it needs to get the tx/rx within the delta.
2615          * TODO: what about up/down delay in arp mode? it wasn't here before
2616          *       so it can wait
2617          */
2618         bond_for_each_slave(bond, slave, i) {
2619                 if (slave->link != BOND_LINK_UP) {
2620                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2621                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2622
2623                                 slave->link  = BOND_LINK_UP;
2624                                 slave->state = BOND_STATE_ACTIVE;
2625
2626                                 /* primary_slave has no meaning in round-robin
2627                                  * mode. the window of a slave being up and
2628                                  * curr_active_slave being null after enslaving
2629                                  * is closed.
2630                                  */
2631                                 if (!oldcurrent) {
2632                                         printk(KERN_INFO DRV_NAME
2633                                                ": %s: link status definitely "
2634                                                "up for interface %s, ",
2635                                                bond_dev->name,
2636                                                slave->dev->name);
2637                                         do_failover = 1;
2638                                 } else {
2639                                         printk(KERN_INFO DRV_NAME
2640                                                ": %s: interface %s is now up\n",
2641                                                bond_dev->name,
2642                                                slave->dev->name);
2643                                 }
2644                         }
2645                 } else {
2646                         /* slave->link == BOND_LINK_UP */
2647
2648                         /* not all switches will respond to an arp request
2649                          * when the source ip is 0, so don't take the link down
2650                          * if we don't know our ip yet
2651                          */
2652                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2653                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2654                              bond_has_ip(bond))) {
2655
2656                                 slave->link  = BOND_LINK_DOWN;
2657                                 slave->state = BOND_STATE_BACKUP;
2658
2659                                 if (slave->link_failure_count < UINT_MAX) {
2660                                         slave->link_failure_count++;
2661                                 }
2662
2663                                 printk(KERN_INFO DRV_NAME
2664                                        ": %s: interface %s is now down.\n",
2665                                        bond_dev->name,
2666                                        slave->dev->name);
2667
2668                                 if (slave == oldcurrent) {
2669                                         do_failover = 1;
2670                                 }
2671                         }
2672                 }
2673
2674                 /* note: if switch is in round-robin mode, all links
2675                  * must tx arp to ensure all links rx an arp - otherwise
2676                  * links may oscillate or not come up at all; if switch is
2677                  * in something like xor mode, there is nothing we can
2678                  * do - all replies will be rx'ed on same link causing slaves
2679                  * to be unstable during low/no traffic periods
2680                  */
2681                 if (IS_UP(slave->dev)) {
2682                         bond_arp_send_all(bond, slave);
2683                 }
2684         }
2685
2686         if (do_failover) {
2687                 write_lock(&bond->curr_slave_lock);
2688
2689                 bond_select_active_slave(bond);
2690
2691                 write_unlock(&bond->curr_slave_lock);
2692         }
2693
2694 re_arm:
2695         if (bond->params.arp_interval) {
2696                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2697         }
2698 out:
2699         read_unlock(&bond->lock);
2700 }
2701
2702 /*
2703  * When using arp monitoring in active-backup mode, this function is
2704  * called to determine if any backup slaves have went down or a new
2705  * current slave needs to be found.
2706  * The backup slaves never generate traffic, they are considered up by merely
2707  * receiving traffic. If the current slave goes down, each backup slave will
2708  * be given the opportunity to tx/rx an arp before being taken down - this
2709  * prevents all slaves from being taken down due to the current slave not
2710  * sending any traffic for the backups to receive. The arps are not necessarily
2711  * necessary, any tx and rx traffic will keep the current slave up. While any
2712  * rx traffic will keep the backup slaves up, the current slave is responsible
2713  * for generating traffic to keep them up regardless of any other traffic they
2714  * may have received.
2715  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2716  */
2717 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2718 {
2719         struct bonding *bond = bond_dev->priv;
2720         struct slave *slave;
2721         int delta_in_ticks;
2722         int i;
2723
2724         read_lock(&bond->lock);
2725
2726         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2727
2728         if (bond->kill_timers) {
2729                 goto out;
2730         }
2731
2732         if (bond->slave_cnt == 0) {
2733                 goto re_arm;
2734         }
2735
2736         /* determine if any slave has come up or any backup slave has
2737          * gone down
2738          * TODO: what about up/down delay in arp mode? it wasn't here before
2739          *       so it can wait
2740          */
2741         bond_for_each_slave(bond, slave, i) {
2742                 if (slave->link != BOND_LINK_UP) {
2743                         if ((jiffies - slave_last_rx(bond, slave)) <=
2744                              delta_in_ticks) {
2745
2746                                 slave->link = BOND_LINK_UP;
2747
2748                                 write_lock(&bond->curr_slave_lock);
2749
2750                                 if ((!bond->curr_active_slave) &&
2751                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2752                                         bond_change_active_slave(bond, slave);
2753                                         bond->current_arp_slave = NULL;
2754                                 } else if (bond->curr_active_slave != slave) {
2755                                         /* this slave has just come up but we
2756                                          * already have a current slave; this
2757                                          * can also happen if bond_enslave adds
2758                                          * a new slave that is up while we are
2759                                          * searching for a new slave
2760                                          */
2761                                         bond_set_slave_inactive_flags(slave);
2762                                         bond->current_arp_slave = NULL;
2763                                 }
2764
2765                                 bond_set_carrier(bond);
2766
2767                                 if (slave == bond->curr_active_slave) {
2768                                         printk(KERN_INFO DRV_NAME
2769                                                ": %s: %s is up and now the "
2770                                                "active interface\n",
2771                                                bond_dev->name,
2772                                                slave->dev->name);
2773                                         netif_carrier_on(bond->dev);
2774                                 } else {
2775                                         printk(KERN_INFO DRV_NAME
2776                                                ": %s: backup interface %s is "
2777                                                "now up\n",
2778                                                bond_dev->name,
2779                                                slave->dev->name);
2780                                 }
2781
2782                                 write_unlock(&bond->curr_slave_lock);
2783                         }
2784                 } else {
2785                         read_lock(&bond->curr_slave_lock);
2786
2787                         if ((slave != bond->curr_active_slave) &&
2788                             (!bond->current_arp_slave) &&
2789                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2790                              bond_has_ip(bond))) {
2791                                 /* a backup slave has gone down; three times
2792                                  * the delta allows the current slave to be
2793                                  * taken out before the backup slave.
2794                                  * note: a non-null current_arp_slave indicates
2795                                  * the curr_active_slave went down and we are
2796                                  * searching for a new one; under this
2797                                  * condition we only take the curr_active_slave
2798                                  * down - this gives each slave a chance to
2799                                  * tx/rx traffic before being taken out
2800                                  */
2801
2802                                 read_unlock(&bond->curr_slave_lock);
2803
2804                                 slave->link  = BOND_LINK_DOWN;
2805
2806                                 if (slave->link_failure_count < UINT_MAX) {
2807                                         slave->link_failure_count++;
2808                                 }
2809
2810                                 bond_set_slave_inactive_flags(slave);
2811
2812                                 printk(KERN_INFO DRV_NAME
2813                                        ": %s: backup interface %s is now down\n",
2814                                        bond_dev->name,
2815                                        slave->dev->name);
2816                         } else {
2817                                 read_unlock(&bond->curr_slave_lock);
2818                         }
2819                 }
2820         }
2821
2822         read_lock(&bond->curr_slave_lock);
2823         slave = bond->curr_active_slave;
2824         read_unlock(&bond->curr_slave_lock);
2825
2826         if (slave) {
2827                 /* if we have sent traffic in the past 2*arp_intervals but
2828                  * haven't xmit and rx traffic in that time interval, select
2829                  * a different slave. slave->jiffies is only updated when
2830                  * a slave first becomes the curr_active_slave - not necessarily
2831                  * after every arp; this ensures the slave has a full 2*delta
2832                  * before being taken out. if a primary is being used, check
2833                  * if it is up and needs to take over as the curr_active_slave
2834                  */
2835                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2836             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2837              bond_has_ip(bond))) &&
2838                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2839
2840                         slave->link  = BOND_LINK_DOWN;
2841
2842                         if (slave->link_failure_count < UINT_MAX) {
2843                                 slave->link_failure_count++;
2844                         }
2845
2846                         printk(KERN_INFO DRV_NAME
2847                                ": %s: link status down for active interface "
2848                                "%s, disabling it\n",
2849                                bond_dev->name,
2850                                slave->dev->name);
2851
2852                         write_lock(&bond->curr_slave_lock);
2853
2854                         bond_select_active_slave(bond);
2855                         slave = bond->curr_active_slave;
2856
2857                         write_unlock(&bond->curr_slave_lock);
2858
2859                         bond->current_arp_slave = slave;
2860
2861                         if (slave) {
2862                                 slave->jiffies = jiffies;
2863                         }
2864                 } else if ((bond->primary_slave) &&
2865                            (bond->primary_slave != slave) &&
2866                            (bond->primary_slave->link == BOND_LINK_UP)) {
2867                         /* at this point, slave is the curr_active_slave */
2868                         printk(KERN_INFO DRV_NAME
2869                                ": %s: changing from interface %s to primary "
2870                                "interface %s\n",
2871                                bond_dev->name,
2872                                slave->dev->name,
2873                                bond->primary_slave->dev->name);
2874
2875                         /* primary is up so switch to it */
2876                         write_lock(&bond->curr_slave_lock);
2877                         bond_change_active_slave(bond, bond->primary_slave);
2878                         write_unlock(&bond->curr_slave_lock);
2879
2880                         slave = bond->primary_slave;
2881                         slave->jiffies = jiffies;
2882                 } else {
2883                         bond->current_arp_slave = NULL;
2884                 }
2885
2886                 /* the current slave must tx an arp to ensure backup slaves
2887                  * rx traffic
2888                  */
2889                 if (slave && bond_has_ip(bond)) {
2890                         bond_arp_send_all(bond, slave);
2891                 }
2892         }
2893
2894         /* if we don't have a curr_active_slave, search for the next available
2895          * backup slave from the current_arp_slave and make it the candidate
2896          * for becoming the curr_active_slave
2897          */
2898         if (!slave) {
2899                 if (!bond->current_arp_slave) {
2900                         bond->current_arp_slave = bond->first_slave;
2901                 }
2902
2903                 if (bond->current_arp_slave) {
2904                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2905
2906                         /* search for next candidate */
2907                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2908                                 if (IS_UP(slave->dev)) {
2909                                         slave->link = BOND_LINK_BACK;
2910                                         bond_set_slave_active_flags(slave);
2911                                         bond_arp_send_all(bond, slave);
2912                                         slave->jiffies = jiffies;
2913                                         bond->current_arp_slave = slave;
2914                                         break;
2915                                 }
2916
2917                                 /* if the link state is up at this point, we
2918                                  * mark it down - this can happen if we have
2919                                  * simultaneous link failures and
2920                                  * reselect_active_interface doesn't make this
2921                                  * one the current slave so it is still marked
2922                                  * up when it is actually down
2923                                  */
2924                                 if (slave->link == BOND_LINK_UP) {
2925                                         slave->link  = BOND_LINK_DOWN;
2926                                         if (slave->link_failure_count < UINT_MAX) {
2927                                                 slave->link_failure_count++;
2928                                         }
2929
2930                                         bond_set_slave_inactive_flags(slave);
2931
2932                                         printk(KERN_INFO DRV_NAME
2933                                                ": %s: backup interface %s is "
2934                                                "now down.\n",
2935                                                bond_dev->name,
2936                                                slave->dev->name);
2937                                 }
2938                         }
2939                 }
2940         }
2941
2942 re_arm:
2943         if (bond->params.arp_interval) {
2944                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2945         }
2946 out:
2947         read_unlock(&bond->lock);
2948 }
2949
2950 /*------------------------------ proc/seq_file-------------------------------*/
2951
2952 #ifdef CONFIG_PROC_FS
2953
2954 #define SEQ_START_TOKEN ((void *)1)
2955
2956 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2957 {
2958         struct bonding *bond = seq->private;
2959         loff_t off = 0;
2960         struct slave *slave;
2961         int i;
2962
2963         /* make sure the bond won't be taken away */
2964         read_lock(&dev_base_lock);
2965         read_lock_bh(&bond->lock);
2966
2967         if (*pos == 0) {
2968                 return SEQ_START_TOKEN;
2969         }
2970
2971         bond_for_each_slave(bond, slave, i) {
2972                 if (++off == *pos) {
2973                         return slave;
2974                 }
2975         }
2976
2977         return NULL;
2978 }
2979
2980 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2981 {
2982         struct bonding *bond = seq->private;
2983         struct slave *slave = v;
2984
2985         ++*pos;
2986         if (v == SEQ_START_TOKEN) {
2987                 return bond->first_slave;
2988         }
2989
2990         slave = slave->next;
2991
2992         return (slave == bond->first_slave) ? NULL : slave;
2993 }
2994
2995 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2996 {
2997         struct bonding *bond = seq->private;
2998
2999         read_unlock_bh(&bond->lock);
3000         read_unlock(&dev_base_lock);
3001 }
3002
3003 static void bond_info_show_master(struct seq_file *seq)
3004 {
3005         struct bonding *bond = seq->private;
3006         struct slave *curr;
3007         int i;
3008         u32 target;
3009
3010         read_lock(&bond->curr_slave_lock);
3011         curr = bond->curr_active_slave;
3012         read_unlock(&bond->curr_slave_lock);
3013
3014         seq_printf(seq, "Bonding Mode: %s\n",
3015                    bond_mode_name(bond->params.mode));
3016
3017         if (bond->params.mode == BOND_MODE_XOR ||
3018                 bond->params.mode == BOND_MODE_8023AD) {
3019                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3020                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3021                         bond->params.xmit_policy);
3022         }
3023
3024         if (USES_PRIMARY(bond->params.mode)) {
3025                 seq_printf(seq, "Primary Slave: %s\n",
3026                            (bond->primary_slave) ?
3027                            bond->primary_slave->dev->name : "None");
3028
3029                 seq_printf(seq, "Currently Active Slave: %s\n",
3030                            (curr) ? curr->dev->name : "None");
3031         }
3032
3033         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3034                    "up" : "down");
3035         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3036         seq_printf(seq, "Up Delay (ms): %d\n",
3037                    bond->params.updelay * bond->params.miimon);
3038         seq_printf(seq, "Down Delay (ms): %d\n",
3039                    bond->params.downdelay * bond->params.miimon);
3040
3041
3042         /* ARP information */
3043         if(bond->params.arp_interval > 0) {
3044                 int printed=0;
3045                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3046                                 bond->params.arp_interval);
3047
3048                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3049
3050                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3051                         if (!bond->params.arp_targets[i])
3052                                 continue;
3053                         if (printed)
3054                                 seq_printf(seq, ",");
3055                         target = ntohl(bond->params.arp_targets[i]);
3056                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3057                         printed = 1;
3058                 }
3059                 seq_printf(seq, "\n");
3060         }
3061
3062         if (bond->params.mode == BOND_MODE_8023AD) {
3063                 struct ad_info ad_info;
3064                 DECLARE_MAC_BUF(mac);
3065
3066                 seq_puts(seq, "\n802.3ad info\n");
3067                 seq_printf(seq, "LACP rate: %s\n",
3068                            (bond->params.lacp_fast) ? "fast" : "slow");
3069
3070                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3071                         seq_printf(seq, "bond %s has no active aggregator\n",
3072                                    bond->dev->name);
3073                 } else {
3074                         seq_printf(seq, "Active Aggregator Info:\n");
3075
3076                         seq_printf(seq, "\tAggregator ID: %d\n",
3077                                    ad_info.aggregator_id);
3078                         seq_printf(seq, "\tNumber of ports: %d\n",
3079                                    ad_info.ports);
3080                         seq_printf(seq, "\tActor Key: %d\n",
3081                                    ad_info.actor_key);
3082                         seq_printf(seq, "\tPartner Key: %d\n",
3083                                    ad_info.partner_key);
3084                         seq_printf(seq, "\tPartner Mac Address: %s\n",
3085                                    print_mac(mac, ad_info.partner_system));
3086                 }
3087         }
3088 }
3089
3090 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3091 {
3092         struct bonding *bond = seq->private;
3093         DECLARE_MAC_BUF(mac);
3094
3095         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3096         seq_printf(seq, "MII Status: %s\n",
3097                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3098         seq_printf(seq, "Link Failure Count: %u\n",
3099                    slave->link_failure_count);
3100
3101         seq_printf(seq,
3102                    "Permanent HW addr: %s\n",
3103                    print_mac(mac, slave->perm_hwaddr));
3104
3105         if (bond->params.mode == BOND_MODE_8023AD) {
3106                 const struct aggregator *agg
3107                         = SLAVE_AD_INFO(slave).port.aggregator;
3108
3109                 if (agg) {
3110                         seq_printf(seq, "Aggregator ID: %d\n",
3111                                    agg->aggregator_identifier);
3112                 } else {
3113                         seq_puts(seq, "Aggregator ID: N/A\n");
3114                 }
3115         }
3116 }
3117
3118 static int bond_info_seq_show(struct seq_file *seq, void *v)
3119 {
3120         if (v == SEQ_START_TOKEN) {
3121                 seq_printf(seq, "%s\n", version);
3122                 bond_info_show_master(seq);
3123         } else {
3124                 bond_info_show_slave(seq, v);
3125         }
3126
3127         return 0;
3128 }
3129
3130 static struct seq_operations bond_info_seq_ops = {
3131         .start = bond_info_seq_start,
3132         .next  = bond_info_seq_next,
3133         .stop  = bond_info_seq_stop,
3134         .show  = bond_info_seq_show,
3135 };
3136
3137 static int bond_info_open(struct inode *inode, struct file *file)
3138 {
3139         struct seq_file *seq;
3140         struct proc_dir_entry *proc;
3141         int res;
3142
3143         res = seq_open(file, &bond_info_seq_ops);
3144         if (!res) {
3145                 /* recover the pointer buried in proc_dir_entry data */
3146                 seq = file->private_data;
3147                 proc = PDE(inode);
3148                 seq->private = proc->data;
3149         }
3150
3151         return res;
3152 }
3153
3154 static const struct file_operations bond_info_fops = {
3155         .owner   = THIS_MODULE,
3156         .open    = bond_info_open,
3157         .read    = seq_read,
3158         .llseek  = seq_lseek,
3159         .release = seq_release,
3160 };
3161
3162 static int bond_create_proc_entry(struct bonding *bond)
3163 {
3164         struct net_device *bond_dev = bond->dev;
3165
3166         if (bond_proc_dir) {
3167                 bond->proc_entry = create_proc_entry(bond_dev->name,
3168                                                      S_IRUGO,
3169                                                      bond_proc_dir);
3170                 if (bond->proc_entry == NULL) {
3171                         printk(KERN_WARNING DRV_NAME
3172                                ": Warning: Cannot create /proc/net/%s/%s\n",
3173                                DRV_NAME, bond_dev->name);
3174                 } else {
3175                         bond->proc_entry->data = bond;
3176                         bond->proc_entry->proc_fops = &bond_info_fops;
3177                         bond->proc_entry->owner = THIS_MODULE;
3178                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3179                 }
3180         }
3181
3182         return 0;
3183 }
3184
3185 static void bond_remove_proc_entry(struct bonding *bond)
3186 {
3187         if (bond_proc_dir && bond->proc_entry) {
3188                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3189                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3190                 bond->proc_entry = NULL;
3191         }
3192 }
3193
3194 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3195  * Caller must hold rtnl_lock.
3196  */
3197 static void bond_create_proc_dir(void)
3198 {
3199         int len = strlen(DRV_NAME);
3200
3201         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3202              bond_proc_dir = bond_proc_dir->next) {
3203                 if ((bond_proc_dir->namelen == len) &&
3204                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3205                         break;
3206                 }
3207         }
3208
3209         if (!bond_proc_dir) {
3210                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3211                 if (bond_proc_dir) {
3212                         bond_proc_dir->owner = THIS_MODULE;
3213                 } else {
3214                         printk(KERN_WARNING DRV_NAME
3215                                 ": Warning: cannot create /proc/net/%s\n",
3216                                 DRV_NAME);
3217                 }
3218         }
3219 }
3220
3221 /* Destroy the bonding directory under /proc/net, if empty.
3222  * Caller must hold rtnl_lock.
3223  */
3224 static void bond_destroy_proc_dir(void)
3225 {
3226         struct proc_dir_entry *de;
3227
3228         if (!bond_proc_dir) {
3229                 return;
3230         }
3231
3232         /* verify that the /proc dir is empty */
3233         for (de = bond_proc_dir->subdir; de; de = de->next) {
3234                 /* ignore . and .. */
3235                 if (*(de->name) != '.') {
3236                         break;
3237                 }
3238         }
3239
3240         if (de) {
3241                 if (bond_proc_dir->owner == THIS_MODULE) {
3242                         bond_proc_dir->owner = NULL;
3243                 }
3244         } else {
3245                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3246                 bond_proc_dir = NULL;
3247         }
3248 }
3249 #endif /* CONFIG_PROC_FS */
3250
3251 /*-------------------------- netdev event handling --------------------------*/
3252
3253 /*
3254  * Change device name
3255  */
3256 static int bond_event_changename(struct bonding *bond)
3257 {
3258 #ifdef CONFIG_PROC_FS
3259         bond_remove_proc_entry(bond);
3260         bond_create_proc_entry(bond);
3261 #endif
3262         down_write(&(bonding_rwsem));
3263         bond_destroy_sysfs_entry(bond);
3264         bond_create_sysfs_entry(bond);
3265         up_write(&(bonding_rwsem));
3266         return NOTIFY_DONE;
3267 }
3268
3269 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3270 {
3271         struct bonding *event_bond = bond_dev->priv;
3272
3273         switch (event) {
3274         case NETDEV_CHANGENAME:
3275                 return bond_event_changename(event_bond);
3276         case NETDEV_UNREGISTER:
3277                 /*
3278                  * TODO: remove a bond from the list?
3279                  */
3280                 break;
3281         default:
3282                 break;
3283         }
3284
3285         return NOTIFY_DONE;
3286 }
3287
3288 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3289 {
3290         struct net_device *bond_dev = slave_dev->master;
3291         struct bonding *bond = bond_dev->priv;
3292
3293         switch (event) {
3294         case NETDEV_UNREGISTER:
3295                 if (bond_dev) {
3296                         bond_release(bond_dev, slave_dev);
3297                 }
3298                 break;
3299         case NETDEV_CHANGE:
3300                 /*
3301                  * TODO: is this what we get if somebody
3302                  * sets up a hierarchical bond, then rmmod's
3303                  * one of the slave bonding devices?
3304                  */
3305                 break;
3306         case NETDEV_DOWN:
3307                 /*
3308                  * ... Or is it this?
3309                  */
3310                 break;
3311         case NETDEV_CHANGEMTU:
3312                 /*
3313                  * TODO: Should slaves be allowed to
3314                  * independently alter their MTU?  For
3315                  * an active-backup bond, slaves need
3316                  * not be the same type of device, so
3317                  * MTUs may vary.  For other modes,
3318                  * slaves arguably should have the
3319                  * same MTUs. To do this, we'd need to
3320                  * take over the slave's change_mtu
3321                  * function for the duration of their
3322                  * servitude.
3323                  */
3324                 break;
3325         case NETDEV_CHANGENAME:
3326                 /*
3327                  * TODO: handle changing the primary's name
3328                  */
3329                 break;
3330         case NETDEV_FEAT_CHANGE:
3331                 bond_compute_features(bond);
3332                 break;
3333         default:
3334                 break;
3335         }
3336
3337         return NOTIFY_DONE;
3338 }
3339
3340 /*
3341  * bond_netdev_event: handle netdev notifier chain events.
3342  *
3343  * This function receives events for the netdev chain.  The caller (an
3344  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3345  * locks for us to safely manipulate the slave devices (RTNL lock,
3346  * dev_probe_lock).
3347  */
3348 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3349 {
3350         struct net_device *event_dev = (struct net_device *)ptr;
3351
3352         if (event_dev->nd_net != &init_net)
3353                 return NOTIFY_DONE;
3354
3355         dprintk("event_dev: %s, event: %lx\n",
3356                 (event_dev ? event_dev->name : "None"),
3357                 event);
3358
3359         if (!(event_dev->priv_flags & IFF_BONDING))
3360                 return NOTIFY_DONE;
3361
3362         if (event_dev->flags & IFF_MASTER) {
3363                 dprintk("IFF_MASTER\n");
3364                 return bond_master_netdev_event(event, event_dev);
3365         }
3366
3367         if (event_dev->flags & IFF_SLAVE) {
3368                 dprintk("IFF_SLAVE\n");
3369                 return bond_slave_netdev_event(event, event_dev);
3370         }
3371
3372         return NOTIFY_DONE;
3373 }
3374
3375 /*
3376  * bond_inetaddr_event: handle inetaddr notifier chain events.
3377  *
3378  * We keep track of device IPs primarily to use as source addresses in
3379  * ARP monitor probes (rather than spewing out broadcasts all the time).
3380  *
3381  * We track one IP for the main device (if it has one), plus one per VLAN.
3382  */
3383 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3384 {
3385         struct in_ifaddr *ifa = ptr;
3386         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3387         struct bonding *bond, *bond_next;
3388         struct vlan_entry *vlan, *vlan_next;
3389
3390         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3391                 if (bond->dev == event_dev) {
3392                         switch (event) {
3393                         case NETDEV_UP:
3394                                 bond->master_ip = ifa->ifa_local;
3395                                 return NOTIFY_OK;
3396                         case NETDEV_DOWN:
3397                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3398                                 return NOTIFY_OK;
3399                         default:
3400                                 return NOTIFY_DONE;
3401                         }
3402                 }
3403
3404                 if (list_empty(&bond->vlan_list))
3405                         continue;
3406
3407                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3408                                          vlan_list) {
3409                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3410                         if (vlan_dev == event_dev) {
3411                                 switch (event) {
3412                                 case NETDEV_UP:
3413                                         vlan->vlan_ip = ifa->ifa_local;
3414                                         return NOTIFY_OK;
3415                                 case NETDEV_DOWN:
3416                                         vlan->vlan_ip =
3417                                                 bond_glean_dev_ip(vlan_dev);
3418                                         return NOTIFY_OK;
3419                                 default:
3420                                         return NOTIFY_DONE;
3421                                 }
3422                         }
3423                 }
3424         }
3425         return NOTIFY_DONE;
3426 }
3427
3428 static struct notifier_block bond_netdev_notifier = {
3429         .notifier_call = bond_netdev_event,
3430 };
3431
3432 static struct notifier_block bond_inetaddr_notifier = {
3433         .notifier_call = bond_inetaddr_event,
3434 };
3435
3436 /*-------------------------- Packet type handling ---------------------------*/
3437
3438 /* register to receive lacpdus on a bond */
3439 static void bond_register_lacpdu(struct bonding *bond)
3440 {
3441         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3442
3443         /* initialize packet type */
3444         pk_type->type = PKT_TYPE_LACPDU;
3445         pk_type->dev = bond->dev;
3446         pk_type->func = bond_3ad_lacpdu_recv;
3447
3448         dev_add_pack(pk_type);
3449 }
3450
3451 /* unregister to receive lacpdus on a bond */
3452 static void bond_unregister_lacpdu(struct bonding *bond)
3453 {
3454         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3455 }
3456
3457 void bond_register_arp(struct bonding *bond)
3458 {
3459         struct packet_type *pt = &bond->arp_mon_pt;
3460
3461         if (pt->type)
3462                 return;
3463
3464         pt->type = htons(ETH_P_ARP);
3465         pt->dev = bond->dev;
3466         pt->func = bond_arp_rcv;
3467         dev_add_pack(pt);
3468 }
3469
3470 void bond_unregister_arp(struct bonding *bond)
3471 {
3472         struct packet_type *pt = &bond->arp_mon_pt;
3473
3474         dev_remove_pack(pt);
3475         pt->type = 0;
3476 }
3477
3478 /*---------------------------- Hashing Policies -----------------------------*/
3479
3480 /*
3481  * Hash for the output device based upon layer 3 and layer 4 data. If
3482  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3483  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3484  */
3485 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3486                                     struct net_device *bond_dev, int count)
3487 {
3488         struct ethhdr *data = (struct ethhdr *)skb->data;
3489         struct iphdr *iph = ip_hdr(skb);
3490         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3491         int layer4_xor = 0;
3492
3493         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3494                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3495                     (iph->protocol == IPPROTO_TCP ||
3496                      iph->protocol == IPPROTO_UDP)) {
3497                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3498                 }
3499                 return (layer4_xor ^
3500                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3501
3502         }
3503
3504         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3505 }
3506
3507 /*
3508  * Hash for the output device based upon layer 2 data
3509  */
3510 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3511                                    struct net_device *bond_dev, int count)
3512 {
3513         struct ethhdr *data = (struct ethhdr *)skb->data;
3514
3515         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3516 }
3517
3518 /*-------------------------- Device entry points ----------------------------*/
3519
3520 static int bond_open(struct net_device *bond_dev)
3521 {
3522         struct bonding *bond = bond_dev->priv;
3523         struct timer_list *mii_timer = &bond->mii_timer;
3524         struct timer_list *arp_timer = &bond->arp_timer;
3525
3526         bond->kill_timers = 0;
3527
3528         if ((bond->params.mode == BOND_MODE_TLB) ||
3529             (bond->params.mode == BOND_MODE_ALB)) {
3530                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3531
3532                 /* bond_alb_initialize must be called before the timer
3533                  * is started.
3534                  */
3535                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3536                         /* something went wrong - fail the open operation */
3537                         return -1;
3538                 }
3539
3540                 init_timer(alb_timer);
3541                 alb_timer->expires  = jiffies + 1;
3542                 alb_timer->data     = (unsigned long)bond;
3543                 alb_timer->function = (void *)&bond_alb_monitor;
3544                 add_timer(alb_timer);
3545         }
3546
3547         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3548                 init_timer(mii_timer);
3549                 mii_timer->expires  = jiffies + 1;
3550                 mii_timer->data     = (unsigned long)bond_dev;
3551                 mii_timer->function = (void *)&bond_mii_monitor;
3552                 add_timer(mii_timer);
3553         }
3554
3555         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3556                 init_timer(arp_timer);
3557                 arp_timer->expires  = jiffies + 1;
3558                 arp_timer->data     = (unsigned long)bond_dev;
3559                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3560                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3561                 } else {
3562                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3563                 }
3564                 if (bond->params.arp_validate)
3565                         bond_register_arp(bond);
3566
3567                 add_timer(arp_timer);
3568         }
3569
3570         if (bond->params.mode == BOND_MODE_8023AD) {
3571                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3572                 init_timer(ad_timer);
3573                 ad_timer->expires  = jiffies + 1;
3574                 ad_timer->data     = (unsigned long)bond;
3575                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3576                 add_timer(ad_timer);
3577
3578                 /* register to receive LACPDUs */
3579                 bond_register_lacpdu(bond);
3580         }
3581
3582         return 0;
3583 }
3584
3585 static int bond_close(struct net_device *bond_dev)
3586 {
3587         struct bonding *bond = bond_dev->priv;
3588
3589         if (bond->params.mode == BOND_MODE_8023AD) {
3590                 /* Unregister the receive of LACPDUs */
3591                 bond_unregister_lacpdu(bond);
3592         }
3593
3594         if (bond->params.arp_validate)
3595                 bond_unregister_arp(bond);
3596
3597         write_lock_bh(&bond->lock);
3598
3599
3600         /* signal timers not to re-arm */
3601         bond->kill_timers = 1;
3602
3603         write_unlock_bh(&bond->lock);
3604
3605         /* del_timer_sync must run without holding the bond->lock
3606          * because a running timer might be trying to hold it too
3607          */
3608
3609         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3610                 del_timer_sync(&bond->mii_timer);
3611         }
3612
3613         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3614                 del_timer_sync(&bond->arp_timer);
3615         }
3616
3617         switch (bond->params.mode) {
3618         case BOND_MODE_8023AD:
3619                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3620                 break;
3621         case BOND_MODE_TLB:
3622         case BOND_MODE_ALB:
3623                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3624                 break;
3625         default:
3626                 break;
3627         }
3628
3629
3630         if ((bond->params.mode == BOND_MODE_TLB) ||
3631             (bond->params.mode == BOND_MODE_ALB)) {
3632                 /* Must be called only after all
3633                  * slaves have been released
3634                  */
3635                 bond_alb_deinitialize(bond);
3636         }
3637
3638         return 0;
3639 }
3640
3641 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3642 {
3643         struct bonding *bond = bond_dev->priv;
3644         struct net_device_stats *stats = &(bond->stats), *sstats;
3645         struct slave *slave;
3646         int i;
3647
3648         memset(stats, 0, sizeof(struct net_device_stats));
3649
3650         read_lock_bh(&bond->lock);
3651
3652         bond_for_each_slave(bond, slave, i) {
3653                 sstats = slave->dev->get_stats(slave->dev);
3654                 stats->rx_packets += sstats->rx_packets;
3655                 stats->rx_bytes += sstats->rx_bytes;
3656                 stats->rx_errors += sstats->rx_errors;
3657                 stats->rx_dropped += sstats->rx_dropped;
3658
3659                 stats->tx_packets += sstats->tx_packets;
3660                 stats->tx_bytes += sstats->tx_bytes;
3661                 stats->tx_errors += sstats->tx_errors;
3662                 stats->tx_dropped += sstats->tx_dropped;
3663
3664                 stats->multicast += sstats->multicast;
3665                 stats->collisions += sstats->collisions;
3666
3667                 stats->rx_length_errors += sstats->rx_length_errors;
3668                 stats->rx_over_errors += sstats->rx_over_errors;
3669                 stats->rx_crc_errors += sstats->rx_crc_errors;
3670                 stats->rx_frame_errors += sstats->rx_frame_errors;
3671                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3672                 stats->rx_missed_errors += sstats->rx_missed_errors;
3673
3674                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3675                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3676                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3677                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3678                 stats->tx_window_errors += sstats->tx_window_errors;
3679         }
3680
3681         read_unlock_bh(&bond->lock);
3682
3683         return stats;
3684 }
3685
3686 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3687 {
3688         struct net_device *slave_dev = NULL;
3689         struct ifbond k_binfo;
3690         struct ifbond __user *u_binfo = NULL;
3691         struct ifslave k_sinfo;
3692         struct ifslave __user *u_sinfo = NULL;
3693         struct mii_ioctl_data *mii = NULL;
3694         int res = 0;
3695
3696         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3697                 bond_dev->name, cmd);
3698
3699         switch (cmd) {
3700         case SIOCGMIIPHY:
3701                 mii = if_mii(ifr);
3702                 if (!mii) {
3703                         return -EINVAL;
3704                 }
3705                 mii->phy_id = 0;
3706                 /* Fall Through */
3707         case SIOCGMIIREG:
3708                 /*
3709                  * We do this again just in case we were called by SIOCGMIIREG
3710                  * instead of SIOCGMIIPHY.
3711                  */
3712                 mii = if_mii(ifr);
3713                 if (!mii) {
3714                         return -EINVAL;
3715                 }
3716
3717                 if (mii->reg_num == 1) {
3718                         struct bonding *bond = bond_dev->priv;
3719                         mii->val_out = 0;
3720                         read_lock_bh(&bond->lock);
3721                         read_lock(&bond->curr_slave_lock);
3722                         if (netif_carrier_ok(bond->dev)) {
3723                                 mii->val_out = BMSR_LSTATUS;
3724                         }
3725                         read_unlock(&bond->curr_slave_lock);
3726                         read_unlock_bh(&bond->lock);
3727                 }
3728
3729                 return 0;
3730         case BOND_INFO_QUERY_OLD:
3731         case SIOCBONDINFOQUERY:
3732                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3733
3734                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3735                         return -EFAULT;
3736                 }
3737
3738                 res = bond_info_query(bond_dev, &k_binfo);
3739                 if (res == 0) {
3740                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3741                                 return -EFAULT;
3742                         }
3743                 }
3744
3745                 return res;
3746         case BOND_SLAVE_INFO_QUERY_OLD:
3747         case SIOCBONDSLAVEINFOQUERY:
3748                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3749
3750                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3751                         return -EFAULT;
3752                 }
3753
3754                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3755                 if (res == 0) {
3756                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3757                                 return -EFAULT;
3758                         }
3759                 }
3760
3761                 return res;
3762         default:
3763                 /* Go on */
3764                 break;
3765         }
3766
3767         if (!capable(CAP_NET_ADMIN)) {
3768                 return -EPERM;
3769         }
3770
3771         down_write(&(bonding_rwsem));
3772         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3773
3774         dprintk("slave_dev=%p: \n", slave_dev);
3775
3776         if (!slave_dev) {
3777                 res = -ENODEV;
3778         } else {
3779                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3780                 switch (cmd) {
3781                 case BOND_ENSLAVE_OLD:
3782                 case SIOCBONDENSLAVE:
3783                         res = bond_enslave(bond_dev, slave_dev);
3784                         break;
3785                 case BOND_RELEASE_OLD:
3786                 case SIOCBONDRELEASE:
3787                         res = bond_release(bond_dev, slave_dev);
3788                         break;
3789                 case BOND_SETHWADDR_OLD:
3790                 case SIOCBONDSETHWADDR:
3791                         res = bond_sethwaddr(bond_dev, slave_dev);
3792                         break;
3793                 case BOND_CHANGE_ACTIVE_OLD:
3794                 case SIOCBONDCHANGEACTIVE:
3795                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3796                         break;
3797                 default:
3798                         res = -EOPNOTSUPP;
3799                 }
3800
3801                 dev_put(slave_dev);
3802         }
3803
3804         up_write(&(bonding_rwsem));
3805         return res;
3806 }
3807
3808 static void bond_set_multicast_list(struct net_device *bond_dev)
3809 {
3810         struct bonding *bond = bond_dev->priv;
3811         struct dev_mc_list *dmi;
3812
3813         write_lock_bh(&bond->lock);
3814
3815         /*
3816          * Do promisc before checking multicast_mode
3817          */
3818         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3819                 bond_set_promiscuity(bond, 1);
3820         }
3821
3822         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3823                 bond_set_promiscuity(bond, -1);
3824         }
3825
3826         /* set allmulti flag to slaves */
3827         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3828                 bond_set_allmulti(bond, 1);
3829         }
3830
3831         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3832                 bond_set_allmulti(bond, -1);
3833         }
3834
3835         bond->flags = bond_dev->flags;
3836
3837         /* looking for addresses to add to slaves' mc list */
3838         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3839                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3840                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3841                 }
3842         }
3843
3844         /* looking for addresses to delete from slaves' list */
3845         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3846                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3847                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3848                 }
3849         }
3850
3851         /* save master's multicast list */
3852         bond_mc_list_destroy(bond);
3853         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3854
3855         write_unlock_bh(&bond->lock);
3856 }
3857
3858 /*
3859  * Change the MTU of all of a master's slaves to match the master
3860  */
3861 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3862 {
3863         struct bonding *bond = bond_dev->priv;
3864         struct slave *slave, *stop_at;
3865         int res = 0;
3866         int i;
3867
3868         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3869                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3870
3871         /* Can't hold bond->lock with bh disabled here since
3872          * some base drivers panic. On the other hand we can't
3873          * hold bond->lock without bh disabled because we'll
3874          * deadlock. The only solution is to rely on the fact
3875          * that we're under rtnl_lock here, and the slaves
3876          * list won't change. This doesn't solve the problem
3877          * of setting the slave's MTU while it is
3878          * transmitting, but the assumption is that the base
3879          * driver can handle that.
3880          *
3881          * TODO: figure out a way to safely iterate the slaves
3882          * list, but without holding a lock around the actual
3883          * call to the base driver.
3884          */
3885
3886         bond_for_each_slave(bond, slave, i) {
3887                 dprintk("s %p s->p %p c_m %p\n", slave,
3888                         slave->prev, slave->dev->change_mtu);
3889
3890                 res = dev_set_mtu(slave->dev, new_mtu);
3891
3892                 if (res) {
3893                         /* If we failed to set the slave's mtu to the new value
3894                          * we must abort the operation even in ACTIVE_BACKUP
3895                          * mode, because if we allow the backup slaves to have
3896                          * different mtu values than the active slave we'll
3897                          * need to change their mtu when doing a failover. That
3898                          * means changing their mtu from timer context, which
3899                          * is probably not a good idea.
3900                          */
3901                         dprintk("err %d %s\n", res, slave->dev->name);
3902                         goto unwind;
3903                 }
3904         }
3905
3906         bond_dev->mtu = new_mtu;
3907
3908         return 0;
3909
3910 unwind:
3911         /* unwind from head to the slave that failed */
3912         stop_at = slave;
3913         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3914                 int tmp_res;
3915
3916                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3917                 if (tmp_res) {
3918                         dprintk("unwind err %d dev %s\n", tmp_res,
3919                                 slave->dev->name);
3920                 }
3921         }
3922
3923         return res;
3924 }
3925
3926 /*
3927  * Change HW address
3928  *
3929  * Note that many devices must be down to change the HW address, and
3930  * downing the master releases all slaves.  We can make bonds full of
3931  * bonding devices to test this, however.
3932  */
3933 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3934 {
3935         struct bonding *bond = bond_dev->priv;
3936         struct sockaddr *sa = addr, tmp_sa;
3937         struct slave *slave, *stop_at;
3938         int res = 0;
3939         int i;
3940
3941         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3942
3943         if (!bond->do_set_mac_addr)
3944                 return -EOPNOTSUPP;
3945
3946         if (!is_valid_ether_addr(sa->sa_data)) {
3947                 return -EADDRNOTAVAIL;
3948         }
3949
3950         /* Can't hold bond->lock with bh disabled here since
3951          * some base drivers panic. On the other hand we can't
3952          * hold bond->lock without bh disabled because we'll
3953          * deadlock. The only solution is to rely on the fact
3954          * that we're under rtnl_lock here, and the slaves
3955          * list won't change. This doesn't solve the problem
3956          * of setting the slave's hw address while it is
3957          * transmitting, but the assumption is that the base
3958          * driver can handle that.
3959          *
3960          * TODO: figure out a way to safely iterate the slaves
3961          * list, but without holding a lock around the actual
3962          * call to the base driver.
3963          */
3964
3965         bond_for_each_slave(bond, slave, i) {
3966                 dprintk("slave %p %s\n", slave, slave->dev->name);
3967
3968                 if (slave->dev->set_mac_address == NULL) {
3969                         res = -EOPNOTSUPP;
3970                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3971                         goto unwind;
3972                 }
3973
3974                 res = dev_set_mac_address(slave->dev, addr);
3975                 if (res) {
3976                         /* TODO: consider downing the slave
3977                          * and retry ?
3978                          * User should expect communications
3979                          * breakage anyway until ARP finish
3980                          * updating, so...
3981                          */
3982                         dprintk("err %d %s\n", res, slave->dev->name);
3983                         goto unwind;
3984                 }
3985         }
3986
3987         /* success */
3988         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3989         return 0;
3990
3991 unwind:
3992         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3993         tmp_sa.sa_family = bond_dev->type;
3994
3995         /* unwind from head to the slave that failed */
3996         stop_at = slave;
3997         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3998                 int tmp_res;
3999
4000                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4001                 if (tmp_res) {
4002                         dprintk("unwind err %d dev %s\n", tmp_res,
4003                                 slave->dev->name);
4004                 }
4005         }
4006
4007         return res;
4008 }
4009
4010 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4011 {
4012         struct bonding *bond = bond_dev->priv;
4013         struct slave *slave, *start_at;
4014         int i;
4015         int res = 1;
4016
4017         read_lock(&bond->lock);
4018
4019         if (!BOND_IS_OK(bond)) {
4020                 goto out;
4021         }
4022
4023         read_lock(&bond->curr_slave_lock);
4024         slave = start_at = bond->curr_active_slave;
4025         read_unlock(&bond->curr_slave_lock);
4026
4027         if (!slave) {
4028                 goto out;
4029         }
4030
4031         bond_for_each_slave_from(bond, slave, i, start_at) {
4032                 if (IS_UP(slave->dev) &&
4033                     (slave->link == BOND_LINK_UP) &&
4034                     (slave->state == BOND_STATE_ACTIVE)) {
4035                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4036
4037                         write_lock(&bond->curr_slave_lock);
4038                         bond->curr_active_slave = slave->next;
4039                         write_unlock(&bond->curr_slave_lock);
4040
4041                         break;
4042                 }
4043         }
4044
4045
4046 out:
4047         if (res) {
4048                 /* no suitable interface, frame not sent */
4049                 dev_kfree_skb(skb);
4050         }
4051         read_unlock(&bond->lock);
4052         return 0;
4053 }
4054
4055
4056 /*
4057  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4058  * the bond has a usable interface.
4059  */
4060 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4061 {
4062         struct bonding *bond = bond_dev->priv;
4063         int res = 1;
4064
4065         read_lock(&bond->lock);
4066         read_lock(&bond->curr_slave_lock);
4067
4068         if (!BOND_IS_OK(bond)) {
4069                 goto out;
4070         }
4071
4072         if (!bond->curr_active_slave)
4073                 goto out;
4074
4075         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4076
4077 out:
4078         if (res) {
4079                 /* no suitable interface, frame not sent */
4080                 dev_kfree_skb(skb);
4081         }
4082         read_unlock(&bond->curr_slave_lock);
4083         read_unlock(&bond->lock);
4084         return 0;
4085 }
4086
4087 /*
4088  * In bond_xmit_xor() , we determine the output device by using a pre-
4089  * determined xmit_hash_policy(), If the selected device is not enabled,
4090  * find the next active slave.
4091  */
4092 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4093 {
4094         struct bonding *bond = bond_dev->priv;
4095         struct slave *slave, *start_at;
4096         int slave_no;
4097         int i;
4098         int res = 1;
4099
4100         read_lock(&bond->lock);
4101
4102         if (!BOND_IS_OK(bond)) {
4103                 goto out;
4104         }
4105
4106         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4107
4108         bond_for_each_slave(bond, slave, i) {
4109                 slave_no--;
4110                 if (slave_no < 0) {
4111                         break;
4112                 }
4113         }
4114
4115         start_at = slave;
4116
4117         bond_for_each_slave_from(bond, slave, i, start_at) {
4118                 if (IS_UP(slave->dev) &&
4119                     (slave->link == BOND_LINK_UP) &&
4120                     (slave->state == BOND_STATE_ACTIVE)) {
4121                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4122                         break;
4123                 }
4124         }
4125
4126 out:
4127         if (res) {
4128                 /* no suitable interface, frame not sent */
4129                 dev_kfree_skb(skb);
4130         }
4131         read_unlock(&bond->lock);
4132         return 0;
4133 }
4134
4135 /*
4136  * in broadcast mode, we send everything to all usable interfaces.
4137  */
4138 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4139 {
4140         struct bonding *bond = bond_dev->priv;
4141         struct slave *slave, *start_at;
4142         struct net_device *tx_dev = NULL;
4143         int i;
4144         int res = 1;
4145
4146         read_lock(&bond->lock);
4147
4148         if (!BOND_IS_OK(bond)) {
4149                 goto out;
4150         }
4151
4152         read_lock(&bond->curr_slave_lock);
4153         start_at = bond->curr_active_slave;
4154         read_unlock(&bond->curr_slave_lock);
4155
4156         if (!start_at) {
4157                 goto out;
4158         }
4159
4160         bond_for_each_slave_from(bond, slave, i, start_at) {
4161                 if (IS_UP(slave->dev) &&
4162                     (slave->link == BOND_LINK_UP) &&
4163                     (slave->state == BOND_STATE_ACTIVE)) {
4164                         if (tx_dev) {
4165                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4166                                 if (!skb2) {
4167                                         printk(KERN_ERR DRV_NAME
4168                                                ": %s: Error: bond_xmit_broadcast(): "
4169                                                "skb_clone() failed\n",
4170                                                bond_dev->name);
4171                                         continue;
4172                                 }
4173
4174                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4175                                 if (res) {
4176                                         dev_kfree_skb(skb2);
4177                                         continue;
4178                                 }
4179                         }
4180                         tx_dev = slave->dev;
4181                 }
4182         }
4183
4184         if (tx_dev) {
4185                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4186         }
4187
4188 out:
4189         if (res) {
4190                 /* no suitable interface, frame not sent */
4191                 dev_kfree_skb(skb);
4192         }
4193         /* frame sent to all suitable interfaces */
4194         read_unlock(&bond->lock);
4195         return 0;
4196 }
4197
4198 /*------------------------- Device initialization ---------------------------*/
4199
4200 /*
4201  * set bond mode specific net device operations
4202  */
4203 void bond_set_mode_ops(struct bonding *bond, int mode)
4204 {
4205         struct net_device *bond_dev = bond->dev;
4206
4207         switch (mode) {
4208         case BOND_MODE_ROUNDROBIN:
4209                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4210                 break;
4211         case BOND_MODE_ACTIVEBACKUP:
4212                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4213                 break;
4214         case BOND_MODE_XOR:
4215                 bond_dev->hard_start_xmit = bond_xmit_xor;
4216                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4217                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4218                 else
4219                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4220                 break;
4221         case BOND_MODE_BROADCAST:
4222                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4223                 break;
4224         case BOND_MODE_8023AD:
4225                 bond_set_master_3ad_flags(bond);
4226                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4227                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4228                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4229                 else
4230                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4231                 break;
4232         case BOND_MODE_ALB:
4233                 bond_set_master_alb_flags(bond);
4234                 /* FALLTHRU */
4235         case BOND_MODE_TLB:
4236                 bond_dev->hard_start_xmit = bond_alb_xmit;
4237                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4238                 break;
4239         default:
4240                 /* Should never happen, mode already checked */
4241                 printk(KERN_ERR DRV_NAME
4242                        ": %s: Error: Unknown bonding mode %d\n",
4243                        bond_dev->name,
4244                        mode);
4245                 break;
4246         }
4247 }
4248
4249 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4250                                     struct ethtool_drvinfo *drvinfo)
4251 {
4252         strncpy(drvinfo->driver, DRV_NAME, 32);
4253         strncpy(drvinfo->version, DRV_VERSION, 32);
4254         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4255 }
4256
4257 static const struct ethtool_ops bond_ethtool_ops = {
4258         .get_drvinfo            = bond_ethtool_get_drvinfo,
4259 };
4260
4261 /*
4262  * Does not allocate but creates a /proc entry.
4263  * Allowed to fail.
4264  */
4265 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4266 {
4267         struct bonding *bond = bond_dev->priv;
4268
4269         dprintk("Begin bond_init for %s\n", bond_dev->name);
4270
4271         /* initialize rwlocks */
4272         rwlock_init(&bond->lock);
4273         rwlock_init(&bond->curr_slave_lock);
4274
4275         bond->params = *params; /* copy params struct */
4276
4277         /* Initialize pointers */
4278         bond->first_slave = NULL;
4279         bond->curr_active_slave = NULL;
4280         bond->current_arp_slave = NULL;
4281         bond->primary_slave = NULL;
4282         bond->dev = bond_dev;
4283         INIT_LIST_HEAD(&bond->vlan_list);
4284
4285         /* Initialize the device entry points */
4286         bond_dev->open = bond_open;
4287         bond_dev->stop = bond_close;
4288         bond_dev->get_stats = bond_get_stats;
4289         bond_dev->do_ioctl = bond_do_ioctl;
4290         bond_dev->ethtool_ops = &bond_ethtool_ops;
4291         bond_dev->set_multicast_list = bond_set_multicast_list;
4292         bond_dev->change_mtu = bond_change_mtu;
4293         bond_dev->set_mac_address = bond_set_mac_address;
4294
4295         bond_set_mode_ops(bond, bond->params.mode);
4296
4297         bond_dev->destructor = free_netdev;
4298
4299         /* Initialize the device options */
4300         bond_dev->tx_queue_len = 0;
4301         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4302         bond_dev->priv_flags |= IFF_BONDING;
4303
4304         /* At first, we block adding VLANs. That's the only way to
4305          * prevent problems that occur when adding VLANs over an
4306          * empty bond. The block will be removed once non-challenged
4307          * slaves are enslaved.
4308          */
4309         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4310
4311         /* don't acquire bond device's netif_tx_lock when
4312          * transmitting */
4313         bond_dev->features |= NETIF_F_LLTX;
4314
4315         /* By default, we declare the bond to be fully
4316          * VLAN hardware accelerated capable. Special
4317          * care is taken in the various xmit functions
4318          * when there are slaves that are not hw accel
4319          * capable
4320          */
4321         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4322         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4323         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4324         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4325                                NETIF_F_HW_VLAN_RX |
4326                                NETIF_F_HW_VLAN_FILTER);
4327
4328 #ifdef CONFIG_PROC_FS
4329         bond_create_proc_entry(bond);
4330 #endif
4331
4332         /* set do_set_mac_addr to true on startup */
4333         bond->do_set_mac_addr = 1;
4334
4335         list_add_tail(&bond->bond_list, &bond_dev_list);
4336
4337         return 0;
4338 }
4339
4340 /* De-initialize device specific data.
4341  * Caller must hold rtnl_lock.
4342  */
4343 void bond_deinit(struct net_device *bond_dev)
4344 {
4345         struct bonding *bond = bond_dev->priv;
4346
4347         list_del(&bond->bond_list);
4348
4349 #ifdef CONFIG_PROC_FS
4350         bond_remove_proc_entry(bond);
4351 #endif
4352 }
4353
4354 /* Unregister and free all bond devices.
4355  * Caller must hold rtnl_lock.
4356  */
4357 static void bond_free_all(void)
4358 {
4359         struct bonding *bond, *nxt;
4360
4361         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4362                 struct net_device *bond_dev = bond->dev;
4363
4364                 bond_mc_list_destroy(bond);
4365                 /* Release the bonded slaves */
4366                 bond_release_all(bond_dev);
4367                 bond_deinit(bond_dev);
4368                 unregister_netdevice(bond_dev);
4369         }
4370
4371 #ifdef CONFIG_PROC_FS
4372         bond_destroy_proc_dir();
4373 #endif
4374 }
4375
4376 /*------------------------- Module initialization ---------------------------*/
4377
4378 /*
4379  * Convert string input module parms.  Accept either the
4380  * number of the mode or its string name.
4381  */
4382 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4383 {
4384         int i;
4385
4386         for (i = 0; tbl[i].modename; i++) {
4387                 if ((isdigit(*mode_arg) &&
4388                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4389                     (strncmp(mode_arg, tbl[i].modename,
4390                              strlen(tbl[i].modename)) == 0)) {
4391                         return tbl[i].mode;
4392                 }
4393         }
4394
4395         return -1;
4396 }
4397
4398 static int bond_check_params(struct bond_params *params)
4399 {
4400         int arp_validate_value;
4401
4402         /*
4403          * Convert string parameters.
4404          */
4405         if (mode) {
4406                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4407                 if (bond_mode == -1) {
4408                         printk(KERN_ERR DRV_NAME
4409                                ": Error: Invalid bonding mode \"%s\"\n",
4410                                mode == NULL ? "NULL" : mode);
4411                         return -EINVAL;
4412                 }
4413         }
4414
4415         if (xmit_hash_policy) {
4416                 if ((bond_mode != BOND_MODE_XOR) &&
4417                     (bond_mode != BOND_MODE_8023AD)) {
4418                         printk(KERN_INFO DRV_NAME
4419                                ": xor_mode param is irrelevant in mode %s\n",
4420                                bond_mode_name(bond_mode));
4421                 } else {
4422                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4423                                                         xmit_hashtype_tbl);
4424                         if (xmit_hashtype == -1) {
4425                                 printk(KERN_ERR DRV_NAME
4426                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4427                                 xmit_hash_policy == NULL ? "NULL" :
4428                                        xmit_hash_policy);
4429                                 return -EINVAL;
4430                         }
4431                 }
4432         }
4433
4434         if (lacp_rate) {
4435                 if (bond_mode != BOND_MODE_8023AD) {
4436                         printk(KERN_INFO DRV_NAME
4437                                ": lacp_rate param is irrelevant in mode %s\n",
4438                                bond_mode_name(bond_mode));
4439                 } else {
4440                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4441                         if (lacp_fast == -1) {
4442                                 printk(KERN_ERR DRV_NAME
4443                                        ": Error: Invalid lacp rate \"%s\"\n",
4444                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4445                                 return -EINVAL;
4446                         }
4447                 }
4448         }
4449
4450         if (max_bonds < 1 || max_bonds > INT_MAX) {
4451                 printk(KERN_WARNING DRV_NAME
4452                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4453                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4454                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4455                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4456         }
4457
4458         if (miimon < 0) {
4459                 printk(KERN_WARNING DRV_NAME
4460                        ": Warning: miimon module parameter (%d), "
4461                        "not in range 0-%d, so it was reset to %d\n",
4462                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4463                 miimon = BOND_LINK_MON_INTERV;
4464         }
4465
4466         if (updelay < 0) {
4467                 printk(KERN_WARNING DRV_NAME
4468                        ": Warning: updelay module parameter (%d), "
4469                        "not in range 0-%d, so it was reset to 0\n",
4470                        updelay, INT_MAX);
4471                 updelay = 0;
4472         }
4473
4474         if (downdelay < 0) {
4475                 printk(KERN_WARNING DRV_NAME
4476                        ": Warning: downdelay module parameter (%d), "
4477                        "not in range 0-%d, so it was reset to 0\n",
4478                        downdelay, INT_MAX);
4479                 downdelay = 0;
4480         }
4481
4482         if ((use_carrier != 0) && (use_carrier != 1)) {
4483                 printk(KERN_WARNING DRV_NAME
4484                        ": Warning: use_carrier module parameter (%d), "
4485                        "not of valid value (0/1), so it was set to 1\n",
4486                        use_carrier);
4487                 use_carrier = 1;
4488         }
4489
4490         /* reset values for 802.3ad */
4491         if (bond_mode == BOND_MODE_8023AD) {
4492                 if (!miimon) {
4493                         printk(KERN_WARNING DRV_NAME
4494                                ": Warning: miimon must be specified, "
4495                                "otherwise bonding will not detect link "
4496                                "failure, speed and duplex which are "
4497                                "essential for 802.3ad operation\n");
4498                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4499                         miimon = 100;
4500                 }
4501         }
4502
4503         /* reset values for TLB/ALB */
4504         if ((bond_mode == BOND_MODE_TLB) ||
4505             (bond_mode == BOND_MODE_ALB)) {
4506                 if (!miimon) {
4507                         printk(KERN_WARNING DRV_NAME
4508                                ": Warning: miimon must be specified, "
4509                                "otherwise bonding will not detect link "
4510                                "failure and link speed which are essential "
4511                                "for TLB/ALB load balancing\n");
4512                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4513                         miimon = 100;
4514                 }
4515         }
4516
4517         if (bond_mode == BOND_MODE_ALB) {
4518                 printk(KERN_NOTICE DRV_NAME
4519                        ": In ALB mode you might experience client "
4520                        "disconnections upon reconnection of a link if the "
4521                        "bonding module updelay parameter (%d msec) is "
4522                        "incompatible with the forwarding delay time of the "
4523                        "switch\n",
4524                        updelay);
4525         }
4526
4527         if (!miimon) {
4528                 if (updelay || downdelay) {
4529                         /* just warn the user the up/down delay will have
4530                          * no effect since miimon is zero...
4531                          */
4532                         printk(KERN_WARNING DRV_NAME
4533                                ": Warning: miimon module parameter not set "
4534                                "and updelay (%d) or downdelay (%d) module "
4535                                "parameter is set; updelay and downdelay have "
4536                                "no effect unless miimon is set\n",
4537                                updelay, downdelay);
4538                 }
4539         } else {
4540                 /* don't allow arp monitoring */
4541                 if (arp_interval) {
4542                         printk(KERN_WARNING DRV_NAME
4543                                ": Warning: miimon (%d) and arp_interval (%d) "
4544                                "can't be used simultaneously, disabling ARP "
4545                                "monitoring\n",
4546                                miimon, arp_interval);
4547                         arp_interval = 0;
4548                 }
4549
4550                 if ((updelay % miimon) != 0) {
4551                         printk(KERN_WARNING DRV_NAME
4552                                ": Warning: updelay (%d) is not a multiple "
4553                                "of miimon (%d), updelay rounded to %d ms\n",
4554                                updelay, miimon, (updelay / miimon) * miimon);
4555                 }
4556
4557                 updelay /= miimon;
4558
4559                 if ((downdelay % miimon) != 0) {
4560                         printk(KERN_WARNING DRV_NAME
4561                                ": Warning: downdelay (%d) is not a multiple "
4562                                "of miimon (%d), downdelay rounded to %d ms\n",
4563                                downdelay, miimon,
4564                                (downdelay / miimon) * miimon);
4565                 }
4566
4567                 downdelay /= miimon;
4568         }
4569
4570         if (arp_interval < 0) {
4571                 printk(KERN_WARNING DRV_NAME
4572                        ": Warning: arp_interval module parameter (%d) "
4573                        ", not in range 0-%d, so it was reset to %d\n",
4574                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4575                 arp_interval = BOND_LINK_ARP_INTERV;
4576         }
4577
4578         for (arp_ip_count = 0;
4579              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4580              arp_ip_count++) {
4581                 /* not complete check, but should be good enough to
4582                    catch mistakes */
4583                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4584                         printk(KERN_WARNING DRV_NAME
4585                                ": Warning: bad arp_ip_target module parameter "
4586                                "(%s), ARP monitoring will not be performed\n",
4587                                arp_ip_target[arp_ip_count]);
4588                         arp_interval = 0;
4589                 } else {
4590                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4591                         arp_target[arp_ip_count] = ip;
4592                 }
4593         }
4594
4595         if (arp_interval && !arp_ip_count) {
4596                 /* don't allow arping if no arp_ip_target given... */
4597                 printk(KERN_WARNING DRV_NAME
4598                        ": Warning: arp_interval module parameter (%d) "
4599                        "specified without providing an arp_ip_target "
4600                        "parameter, arp_interval was reset to 0\n",
4601                        arp_interval);
4602                 arp_interval = 0;
4603         }
4604
4605         if (arp_validate) {
4606                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4607                         printk(KERN_ERR DRV_NAME
4608                ": arp_validate only supported in active-backup mode\n");
4609                         return -EINVAL;
4610                 }
4611                 if (!arp_interval) {
4612                         printk(KERN_ERR DRV_NAME
4613                                ": arp_validate requires arp_interval\n");
4614                         return -EINVAL;
4615                 }
4616
4617                 arp_validate_value = bond_parse_parm(arp_validate,
4618                                                      arp_validate_tbl);
4619                 if (arp_validate_value == -1) {
4620                         printk(KERN_ERR DRV_NAME
4621                                ": Error: invalid arp_validate \"%s\"\n",
4622                                arp_validate == NULL ? "NULL" : arp_validate);
4623                         return -EINVAL;
4624                 }
4625         } else
4626                 arp_validate_value = 0;
4627
4628         if (miimon) {
4629                 printk(KERN_INFO DRV_NAME
4630                        ": MII link monitoring set to %d ms\n",
4631                        miimon);
4632         } else if (arp_interval) {
4633                 int i;
4634
4635                 printk(KERN_INFO DRV_NAME
4636                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4637                        arp_interval,
4638                        arp_validate_tbl[arp_validate_value].modename,
4639                        arp_ip_count);
4640
4641                 for (i = 0; i < arp_ip_count; i++)
4642                         printk (" %s", arp_ip_target[i]);
4643
4644                 printk("\n");
4645
4646         } else {
4647                 /* miimon and arp_interval not set, we need one so things
4648                  * work as expected, see bonding.txt for details
4649                  */
4650                 printk(KERN_WARNING DRV_NAME
4651                        ": Warning: either miimon or arp_interval and "
4652                        "arp_ip_target module parameters must be specified, "
4653                        "otherwise bonding will not detect link failures! see "
4654                        "bonding.txt for details.\n");
4655         }
4656
4657         if (primary && !USES_PRIMARY(bond_mode)) {
4658                 /* currently, using a primary only makes sense
4659                  * in active backup, TLB or ALB modes
4660                  */
4661                 printk(KERN_WARNING DRV_NAME
4662                        ": Warning: %s primary device specified but has no "
4663                        "effect in %s mode\n",
4664                        primary, bond_mode_name(bond_mode));
4665                 primary = NULL;
4666         }
4667
4668         /* fill params struct with the proper values */
4669         params->mode = bond_mode;
4670         params->xmit_policy = xmit_hashtype;
4671         params->miimon = miimon;
4672         params->arp_interval = arp_interval;
4673         params->arp_validate = arp_validate_value;
4674         params->updelay = updelay;
4675         params->downdelay = downdelay;
4676         params->use_carrier = use_carrier;
4677         params->lacp_fast = lacp_fast;
4678         params->primary[0] = 0;
4679
4680         if (primary) {
4681                 strncpy(params->primary, primary, IFNAMSIZ);
4682                 params->primary[IFNAMSIZ - 1] = 0;
4683         }
4684
4685         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4686
4687         return 0;
4688 }
4689
4690 static struct lock_class_key bonding_netdev_xmit_lock_key;
4691
4692 /* Create a new bond based on the specified name and bonding parameters.
4693  * If name is NULL, obtain a suitable "bond%d" name for us.
4694  * Caller must NOT hold rtnl_lock; we need to release it here before we
4695  * set up our sysfs entries.
4696  */
4697 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4698 {
4699         struct net_device *bond_dev;
4700         int res;
4701
4702         rtnl_lock();
4703         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4704                                 ether_setup);
4705         if (!bond_dev) {
4706                 printk(KERN_ERR DRV_NAME
4707                        ": %s: eek! can't alloc netdev!\n",
4708                        name);
4709                 res = -ENOMEM;
4710                 goto out_rtnl;
4711         }
4712
4713         if (!name) {
4714                 res = dev_alloc_name(bond_dev, "bond%d");
4715                 if (res < 0)
4716                         goto out_netdev;
4717         }
4718
4719         /* bond_init() must be called after dev_alloc_name() (for the
4720          * /proc files), but before register_netdevice(), because we
4721          * need to set function pointers.
4722          */
4723
4724         res = bond_init(bond_dev, params);
4725         if (res < 0) {
4726                 goto out_netdev;
4727         }
4728
4729         res = register_netdevice(bond_dev);
4730         if (res < 0) {
4731                 goto out_bond;
4732         }
4733
4734         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4735
4736         if (newbond)
4737                 *newbond = bond_dev->priv;
4738
4739         netif_carrier_off(bond_dev);
4740
4741         rtnl_unlock(); /* allows sysfs registration of net device */
4742         res = bond_create_sysfs_entry(bond_dev->priv);
4743         if (res < 0) {
4744                 rtnl_lock();
4745                 goto out_bond;
4746         }
4747
4748         return 0;
4749
4750 out_bond:
4751         bond_deinit(bond_dev);
4752 out_netdev:
4753         free_netdev(bond_dev);
4754 out_rtnl:
4755         rtnl_unlock();
4756         return res;
4757 }
4758
4759 static int __init bonding_init(void)
4760 {
4761         int i;
4762         int res;
4763
4764         printk(KERN_INFO "%s", version);
4765
4766         res = bond_check_params(&bonding_defaults);
4767         if (res) {
4768                 goto out;
4769         }
4770
4771 #ifdef CONFIG_PROC_FS
4772         bond_create_proc_dir();
4773 #endif
4774         for (i = 0; i < max_bonds; i++) {
4775                 res = bond_create(NULL, &bonding_defaults, NULL);
4776                 if (res)
4777                         goto err;
4778         }
4779
4780         res = bond_create_sysfs();
4781         if (res)
4782                 goto err;
4783
4784         register_netdevice_notifier(&bond_netdev_notifier);
4785         register_inetaddr_notifier(&bond_inetaddr_notifier);
4786
4787         goto out;
4788 err:
4789         rtnl_lock();
4790         bond_free_all();
4791         bond_destroy_sysfs();
4792         rtnl_unlock();
4793 out:
4794         return res;
4795
4796 }
4797
4798 static void __exit bonding_exit(void)
4799 {
4800         unregister_netdevice_notifier(&bond_netdev_notifier);
4801         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4802
4803         rtnl_lock();
4804         bond_free_all();
4805         bond_destroy_sysfs();
4806         rtnl_unlock();
4807 }
4808
4809 module_init(bonding_init);
4810 module_exit(bonding_exit);
4811 MODULE_LICENSE("GPL");
4812 MODULE_VERSION(DRV_VERSION);
4813 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4814 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4815 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4816
4817 /*
4818  * Local variables:
4819  *  c-indent-level: 8
4820  *  c-basic-offset: 8
4821  *  tab-width: 8
4822  * End:
4823  */
4824