[NET]: Make packet reception network namespace safe
[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 u32 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                 bond_send_gratuitous_arp(bond);
1100         }
1101 }
1102
1103 /**
1104  * bond_select_active_slave - select a new active slave, if needed
1105  * @bond: our bonding struct
1106  *
1107  * This functions shoud be called when one of the following occurs:
1108  * - The old curr_active_slave has been released or lost its link.
1109  * - The primary_slave has got its link back.
1110  * - A slave has got its link back and there's no old curr_active_slave.
1111  *
1112  * Warning: Caller must hold curr_slave_lock for writing.
1113  */
1114 void bond_select_active_slave(struct bonding *bond)
1115 {
1116         struct slave *best_slave;
1117         int rv;
1118
1119         best_slave = bond_find_best_slave(bond);
1120         if (best_slave != bond->curr_active_slave) {
1121                 bond_change_active_slave(bond, best_slave);
1122                 rv = bond_set_carrier(bond);
1123                 if (!rv)
1124                         return;
1125
1126                 if (netif_carrier_ok(bond->dev)) {
1127                         printk(KERN_INFO DRV_NAME
1128                                ": %s: first active interface up!\n",
1129                                bond->dev->name);
1130                 } else {
1131                         printk(KERN_INFO DRV_NAME ": %s: "
1132                                "now running without any active interface !\n",
1133                                bond->dev->name);
1134                 }
1135         }
1136 }
1137
1138 /*--------------------------- slave list handling ---------------------------*/
1139
1140 /*
1141  * This function attaches the slave to the end of list.
1142  *
1143  * bond->lock held for writing by caller.
1144  */
1145 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1146 {
1147         if (bond->first_slave == NULL) { /* attaching the first slave */
1148                 new_slave->next = new_slave;
1149                 new_slave->prev = new_slave;
1150                 bond->first_slave = new_slave;
1151         } else {
1152                 new_slave->next = bond->first_slave;
1153                 new_slave->prev = bond->first_slave->prev;
1154                 new_slave->next->prev = new_slave;
1155                 new_slave->prev->next = new_slave;
1156         }
1157
1158         bond->slave_cnt++;
1159 }
1160
1161 /*
1162  * This function detaches the slave from the list.
1163  * WARNING: no check is made to verify if the slave effectively
1164  * belongs to <bond>.
1165  * Nothing is freed on return, structures are just unchained.
1166  * If any slave pointer in bond was pointing to <slave>,
1167  * it should be changed by the calling function.
1168  *
1169  * bond->lock held for writing by caller.
1170  */
1171 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1172 {
1173         if (slave->next) {
1174                 slave->next->prev = slave->prev;
1175         }
1176
1177         if (slave->prev) {
1178                 slave->prev->next = slave->next;
1179         }
1180
1181         if (bond->first_slave == slave) { /* slave is the first slave */
1182                 if (bond->slave_cnt > 1) { /* there are more slave */
1183                         bond->first_slave = slave->next;
1184                 } else {
1185                         bond->first_slave = NULL; /* slave was the last one */
1186                 }
1187         }
1188
1189         slave->next = NULL;
1190         slave->prev = NULL;
1191         bond->slave_cnt--;
1192 }
1193
1194 /*---------------------------------- IOCTL ----------------------------------*/
1195
1196 static int bond_sethwaddr(struct net_device *bond_dev,
1197                           struct net_device *slave_dev)
1198 {
1199         dprintk("bond_dev=%p\n", bond_dev);
1200         dprintk("slave_dev=%p\n", slave_dev);
1201         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1202         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1203         return 0;
1204 }
1205
1206 #define BOND_VLAN_FEATURES \
1207         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1208          NETIF_F_HW_VLAN_FILTER)
1209
1210 /* 
1211  * Compute the common dev->feature set available to all slaves.  Some
1212  * feature bits are managed elsewhere, so preserve those feature bits
1213  * on the master device.
1214  */
1215 static int bond_compute_features(struct bonding *bond)
1216 {
1217         struct slave *slave;
1218         struct net_device *bond_dev = bond->dev;
1219         unsigned long features = bond_dev->features;
1220         unsigned short max_hard_header_len = ETH_HLEN;
1221         int i;
1222
1223         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1224         features |= NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
1225                     NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1226
1227         bond_for_each_slave(bond, slave, i) {
1228                 features = netdev_compute_features(features,
1229                                                    slave->dev->features);
1230                 if (slave->dev->hard_header_len > max_hard_header_len)
1231                         max_hard_header_len = slave->dev->hard_header_len;
1232         }
1233
1234         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1235         bond_dev->features = features;
1236         bond_dev->hard_header_len = max_hard_header_len;
1237
1238         return 0;
1239 }
1240
1241 /* enslave device <slave> to bond device <master> */
1242 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1243 {
1244         struct bonding *bond = bond_dev->priv;
1245         struct slave *new_slave = NULL;
1246         struct dev_mc_list *dmi;
1247         struct sockaddr addr;
1248         int link_reporting;
1249         int old_features = bond_dev->features;
1250         int res = 0;
1251
1252         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1253                 slave_dev->do_ioctl == NULL) {
1254                 printk(KERN_WARNING DRV_NAME
1255                        ": %s: Warning: no link monitoring support for %s\n",
1256                        bond_dev->name, slave_dev->name);
1257         }
1258
1259         /* bond must be initialized by bond_open() before enslaving */
1260         if (!(bond_dev->flags & IFF_UP)) {
1261                 dprintk("Error, master_dev is not up\n");
1262                 return -EPERM;
1263         }
1264
1265         /* already enslaved */
1266         if (slave_dev->flags & IFF_SLAVE) {
1267                 dprintk("Error, Device was already enslaved\n");
1268                 return -EBUSY;
1269         }
1270
1271         /* vlan challenged mutual exclusion */
1272         /* no need to lock since we're protected by rtnl_lock */
1273         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1274                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1275                 if (!list_empty(&bond->vlan_list)) {
1276                         printk(KERN_ERR DRV_NAME
1277                                ": %s: Error: cannot enslave VLAN "
1278                                "challenged slave %s on VLAN enabled "
1279                                "bond %s\n", bond_dev->name, slave_dev->name,
1280                                bond_dev->name);
1281                         return -EPERM;
1282                 } else {
1283                         printk(KERN_WARNING DRV_NAME
1284                                ": %s: Warning: enslaved VLAN challenged "
1285                                "slave %s. Adding VLANs will be blocked as "
1286                                "long as %s is part of bond %s\n",
1287                                bond_dev->name, slave_dev->name, slave_dev->name,
1288                                bond_dev->name);
1289                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1290                 }
1291         } else {
1292                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1293                 if (bond->slave_cnt == 0) {
1294                         /* First slave, and it is not VLAN challenged,
1295                          * so remove the block of adding VLANs over the bond.
1296                          */
1297                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1298                 }
1299         }
1300
1301         /*
1302          * Old ifenslave binaries are no longer supported.  These can
1303          * be identified with moderate accurary by the state of the slave:
1304          * the current ifenslave will set the interface down prior to
1305          * enslaving it; the old ifenslave will not.
1306          */
1307         if ((slave_dev->flags & IFF_UP)) {
1308                 printk(KERN_ERR DRV_NAME ": %s is up. "
1309                        "This may be due to an out of date ifenslave.\n",
1310                        slave_dev->name);
1311                 res = -EPERM;
1312                 goto err_undo_flags;
1313         }
1314
1315         if (slave_dev->set_mac_address == NULL) {
1316                 printk(KERN_ERR DRV_NAME
1317                         ": %s: Error: The slave device you specified does "
1318                         "not support setting the MAC address. "
1319                         "Your kernel likely does not support slave "
1320                         "devices.\n", bond_dev->name);
1321                 res = -EOPNOTSUPP;
1322                 goto err_undo_flags;
1323         }
1324
1325         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1326         if (!new_slave) {
1327                 res = -ENOMEM;
1328                 goto err_undo_flags;
1329         }
1330
1331         /* save slave's original flags before calling
1332          * netdev_set_master and dev_open
1333          */
1334         new_slave->original_flags = slave_dev->flags;
1335
1336         /*
1337          * Save slave's original ("permanent") mac address for modes
1338          * that need it, and for restoring it upon release, and then
1339          * set it to the master's address
1340          */
1341         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1342
1343         /*
1344          * Set slave to master's mac address.  The application already
1345          * set the master's mac address to that of the first slave
1346          */
1347         memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1348         addr.sa_family = slave_dev->type;
1349         res = dev_set_mac_address(slave_dev, &addr);
1350         if (res) {
1351                 dprintk("Error %d calling set_mac_address\n", res);
1352                 goto err_free;
1353         }
1354
1355         res = netdev_set_master(slave_dev, bond_dev);
1356         if (res) {
1357                 dprintk("Error %d calling netdev_set_master\n", res);
1358                 goto err_close;
1359         }
1360         /* open the slave since the application closed it */
1361         res = dev_open(slave_dev);
1362         if (res) {
1363                 dprintk("Openning slave %s failed\n", slave_dev->name);
1364                 goto err_restore_mac;
1365         }
1366
1367         new_slave->dev = slave_dev;
1368         slave_dev->priv_flags |= IFF_BONDING;
1369
1370         if ((bond->params.mode == BOND_MODE_TLB) ||
1371             (bond->params.mode == BOND_MODE_ALB)) {
1372                 /* bond_alb_init_slave() must be called before all other stages since
1373                  * it might fail and we do not want to have to undo everything
1374                  */
1375                 res = bond_alb_init_slave(bond, new_slave);
1376                 if (res) {
1377                         goto err_unset_master;
1378                 }
1379         }
1380
1381         /* If the mode USES_PRIMARY, then the new slave gets the
1382          * master's promisc (and mc) settings only if it becomes the
1383          * curr_active_slave, and that is taken care of later when calling
1384          * bond_change_active()
1385          */
1386         if (!USES_PRIMARY(bond->params.mode)) {
1387                 /* set promiscuity level to new slave */
1388                 if (bond_dev->flags & IFF_PROMISC) {
1389                         dev_set_promiscuity(slave_dev, 1);
1390                 }
1391
1392                 /* set allmulti level to new slave */
1393                 if (bond_dev->flags & IFF_ALLMULTI) {
1394                         dev_set_allmulti(slave_dev, 1);
1395                 }
1396
1397                 /* upload master's mc_list to new slave */
1398                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1399                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1400                 }
1401         }
1402
1403         if (bond->params.mode == BOND_MODE_8023AD) {
1404                 /* add lacpdu mc addr to mc list */
1405                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1406
1407                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1408         }
1409
1410         bond_add_vlans_on_slave(bond, slave_dev);
1411
1412         write_lock_bh(&bond->lock);
1413
1414         bond_attach_slave(bond, new_slave);
1415
1416         new_slave->delay = 0;
1417         new_slave->link_failure_count = 0;
1418
1419         bond_compute_features(bond);
1420
1421         new_slave->last_arp_rx = jiffies;
1422
1423         if (bond->params.miimon && !bond->params.use_carrier) {
1424                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1425
1426                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1427                         /*
1428                          * miimon is set but a bonded network driver
1429                          * does not support ETHTOOL/MII and
1430                          * arp_interval is not set.  Note: if
1431                          * use_carrier is enabled, we will never go
1432                          * here (because netif_carrier is always
1433                          * supported); thus, we don't need to change
1434                          * the messages for netif_carrier.
1435                          */
1436                         printk(KERN_WARNING DRV_NAME
1437                                ": %s: Warning: MII and ETHTOOL support not "
1438                                "available for interface %s, and "
1439                                "arp_interval/arp_ip_target module parameters "
1440                                "not specified, thus bonding will not detect "
1441                                "link failures! see bonding.txt for details.\n",
1442                                bond_dev->name, slave_dev->name);
1443                 } else if (link_reporting == -1) {
1444                         /* unable get link status using mii/ethtool */
1445                         printk(KERN_WARNING DRV_NAME
1446                                ": %s: Warning: can't get link status from "
1447                                "interface %s; the network driver associated "
1448                                "with this interface does not support MII or "
1449                                "ETHTOOL link status reporting, thus miimon "
1450                                "has no effect on this interface.\n",
1451                                bond_dev->name, slave_dev->name);
1452                 }
1453         }
1454
1455         /* check for initial state */
1456         if (!bond->params.miimon ||
1457             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1458                 if (bond->params.updelay) {
1459                         dprintk("Initial state of slave_dev is "
1460                                 "BOND_LINK_BACK\n");
1461                         new_slave->link  = BOND_LINK_BACK;
1462                         new_slave->delay = bond->params.updelay;
1463                 } else {
1464                         dprintk("Initial state of slave_dev is "
1465                                 "BOND_LINK_UP\n");
1466                         new_slave->link  = BOND_LINK_UP;
1467                 }
1468                 new_slave->jiffies = jiffies;
1469         } else {
1470                 dprintk("Initial state of slave_dev is "
1471                         "BOND_LINK_DOWN\n");
1472                 new_slave->link  = BOND_LINK_DOWN;
1473         }
1474
1475         if (bond_update_speed_duplex(new_slave) &&
1476             (new_slave->link != BOND_LINK_DOWN)) {
1477                 printk(KERN_WARNING DRV_NAME
1478                        ": %s: Warning: failed to get speed and duplex from %s, "
1479                        "assumed to be 100Mb/sec and Full.\n",
1480                        bond_dev->name, new_slave->dev->name);
1481
1482                 if (bond->params.mode == BOND_MODE_8023AD) {
1483                         printk(KERN_WARNING DRV_NAME
1484                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1485                                "support in base driver for proper aggregator "
1486                                "selection.\n", bond_dev->name);
1487                 }
1488         }
1489
1490         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1491                 /* if there is a primary slave, remember it */
1492                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1493                         bond->primary_slave = new_slave;
1494                 }
1495         }
1496
1497         switch (bond->params.mode) {
1498         case BOND_MODE_ACTIVEBACKUP:
1499                 bond_set_slave_inactive_flags(new_slave);
1500                 bond_select_active_slave(bond);
1501                 break;
1502         case BOND_MODE_8023AD:
1503                 /* in 802.3ad mode, the internal mechanism
1504                  * will activate the slaves in the selected
1505                  * aggregator
1506                  */
1507                 bond_set_slave_inactive_flags(new_slave);
1508                 /* if this is the first slave */
1509                 if (bond->slave_cnt == 1) {
1510                         SLAVE_AD_INFO(new_slave).id = 1;
1511                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1512                          * can be called only after the mac address of the bond is set
1513                          */
1514                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1515                                             bond->params.lacp_fast);
1516                 } else {
1517                         SLAVE_AD_INFO(new_slave).id =
1518                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1519                 }
1520
1521                 bond_3ad_bind_slave(new_slave);
1522                 break;
1523         case BOND_MODE_TLB:
1524         case BOND_MODE_ALB:
1525                 new_slave->state = BOND_STATE_ACTIVE;
1526                 if ((!bond->curr_active_slave) &&
1527                     (new_slave->link != BOND_LINK_DOWN)) {
1528                         /* first slave or no active slave yet, and this link
1529                          * is OK, so make this interface the active one
1530                          */
1531                         bond_change_active_slave(bond, new_slave);
1532                 } else {
1533                         bond_set_slave_inactive_flags(new_slave);
1534                 }
1535                 break;
1536         default:
1537                 dprintk("This slave is always active in trunk mode\n");
1538
1539                 /* always active in trunk mode */
1540                 new_slave->state = BOND_STATE_ACTIVE;
1541
1542                 /* In trunking mode there is little meaning to curr_active_slave
1543                  * anyway (it holds no special properties of the bond device),
1544                  * so we can change it without calling change_active_interface()
1545                  */
1546                 if (!bond->curr_active_slave) {
1547                         bond->curr_active_slave = new_slave;
1548                 }
1549                 break;
1550         } /* switch(bond_mode) */
1551
1552         bond_set_carrier(bond);
1553
1554         write_unlock_bh(&bond->lock);
1555
1556         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1557         if (res)
1558                 goto err_unset_master;
1559
1560         printk(KERN_INFO DRV_NAME
1561                ": %s: enslaving %s as a%s interface with a%s link.\n",
1562                bond_dev->name, slave_dev->name,
1563                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1564                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1565
1566         /* enslave is successful */
1567         return 0;
1568
1569 /* Undo stages on error */
1570 err_unset_master:
1571         netdev_set_master(slave_dev, NULL);
1572
1573 err_close:
1574         dev_close(slave_dev);
1575
1576 err_restore_mac:
1577         memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1578         addr.sa_family = slave_dev->type;
1579         dev_set_mac_address(slave_dev, &addr);
1580
1581 err_free:
1582         kfree(new_slave);
1583
1584 err_undo_flags:
1585         bond_dev->features = old_features;
1586  
1587         return res;
1588 }
1589
1590 /*
1591  * Try to release the slave device <slave> from the bond device <master>
1592  * It is legal to access curr_active_slave without a lock because all the function
1593  * is write-locked.
1594  *
1595  * The rules for slave state should be:
1596  *   for Active/Backup:
1597  *     Active stays on all backups go down
1598  *   for Bonded connections:
1599  *     The first up interface should be left on and all others downed.
1600  */
1601 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1602 {
1603         struct bonding *bond = bond_dev->priv;
1604         struct slave *slave, *oldcurrent;
1605         struct sockaddr addr;
1606         int mac_addr_differ;
1607
1608         /* slave is not a slave or master is not master of this slave */
1609         if (!(slave_dev->flags & IFF_SLAVE) ||
1610             (slave_dev->master != bond_dev)) {
1611                 printk(KERN_ERR DRV_NAME
1612                        ": %s: Error: cannot release %s.\n",
1613                        bond_dev->name, slave_dev->name);
1614                 return -EINVAL;
1615         }
1616
1617         write_lock_bh(&bond->lock);
1618
1619         slave = bond_get_slave_by_dev(bond, slave_dev);
1620         if (!slave) {
1621                 /* not a slave of this bond */
1622                 printk(KERN_INFO DRV_NAME
1623                        ": %s: %s not enslaved\n",
1624                        bond_dev->name, slave_dev->name);
1625                 write_unlock_bh(&bond->lock);
1626                 return -EINVAL;
1627         }
1628
1629         mac_addr_differ = memcmp(bond_dev->dev_addr,
1630                                  slave->perm_hwaddr,
1631                                  ETH_ALEN);
1632         if (!mac_addr_differ && (bond->slave_cnt > 1)) {
1633                 printk(KERN_WARNING DRV_NAME
1634                        ": %s: Warning: the permanent HWaddr of %s "
1635                        "- %02X:%02X:%02X:%02X:%02X:%02X - is "
1636                        "still in use by %s. Set the HWaddr of "
1637                        "%s to a different address to avoid "
1638                        "conflicts.\n",
1639                        bond_dev->name,
1640                        slave_dev->name,
1641                        slave->perm_hwaddr[0],
1642                        slave->perm_hwaddr[1],
1643                        slave->perm_hwaddr[2],
1644                        slave->perm_hwaddr[3],
1645                        slave->perm_hwaddr[4],
1646                        slave->perm_hwaddr[5],
1647                        bond_dev->name,
1648                        slave_dev->name);
1649         }
1650
1651         /* Inform AD package of unbinding of slave. */
1652         if (bond->params.mode == BOND_MODE_8023AD) {
1653                 /* must be called before the slave is
1654                  * detached from the list
1655                  */
1656                 bond_3ad_unbind_slave(slave);
1657         }
1658
1659         printk(KERN_INFO DRV_NAME
1660                ": %s: releasing %s interface %s\n",
1661                bond_dev->name,
1662                (slave->state == BOND_STATE_ACTIVE)
1663                ? "active" : "backup",
1664                slave_dev->name);
1665
1666         oldcurrent = bond->curr_active_slave;
1667
1668         bond->current_arp_slave = NULL;
1669
1670         /* release the slave from its bond */
1671         bond_detach_slave(bond, slave);
1672
1673         bond_compute_features(bond);
1674
1675         if (bond->primary_slave == slave) {
1676                 bond->primary_slave = NULL;
1677         }
1678
1679         if (oldcurrent == slave) {
1680                 bond_change_active_slave(bond, NULL);
1681         }
1682
1683         if ((bond->params.mode == BOND_MODE_TLB) ||
1684             (bond->params.mode == BOND_MODE_ALB)) {
1685                 /* Must be called only after the slave has been
1686                  * detached from the list and the curr_active_slave
1687                  * has been cleared (if our_slave == old_current),
1688                  * but before a new active slave is selected.
1689                  */
1690                 bond_alb_deinit_slave(bond, slave);
1691         }
1692
1693         if (oldcurrent == slave)
1694                 bond_select_active_slave(bond);
1695
1696         if (bond->slave_cnt == 0) {
1697                 bond_set_carrier(bond);
1698
1699                 /* if the last slave was removed, zero the mac address
1700                  * of the master so it will be set by the application
1701                  * to the mac address of the first slave
1702                  */
1703                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1704
1705                 if (list_empty(&bond->vlan_list)) {
1706                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1707                 } else {
1708                         printk(KERN_WARNING DRV_NAME
1709                                ": %s: Warning: clearing HW address of %s while it "
1710                                "still has VLANs.\n",
1711                                bond_dev->name, bond_dev->name);
1712                         printk(KERN_WARNING DRV_NAME
1713                                ": %s: When re-adding slaves, make sure the bond's "
1714                                "HW address matches its VLANs'.\n",
1715                                bond_dev->name);
1716                 }
1717         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1718                    !bond_has_challenged_slaves(bond)) {
1719                 printk(KERN_INFO DRV_NAME
1720                        ": %s: last VLAN challenged slave %s "
1721                        "left bond %s. VLAN blocking is removed\n",
1722                        bond_dev->name, slave_dev->name, bond_dev->name);
1723                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1724         }
1725
1726         write_unlock_bh(&bond->lock);
1727
1728         /* must do this from outside any spinlocks */
1729         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1730
1731         bond_del_vlans_from_slave(bond, slave_dev);
1732
1733         /* If the mode USES_PRIMARY, then we should only remove its
1734          * promisc and mc settings if it was the curr_active_slave, but that was
1735          * already taken care of above when we detached the slave
1736          */
1737         if (!USES_PRIMARY(bond->params.mode)) {
1738                 /* unset promiscuity level from slave */
1739                 if (bond_dev->flags & IFF_PROMISC) {
1740                         dev_set_promiscuity(slave_dev, -1);
1741                 }
1742
1743                 /* unset allmulti level from slave */
1744                 if (bond_dev->flags & IFF_ALLMULTI) {
1745                         dev_set_allmulti(slave_dev, -1);
1746                 }
1747
1748                 /* flush master's mc_list from slave */
1749                 bond_mc_list_flush(bond_dev, slave_dev);
1750         }
1751
1752         netdev_set_master(slave_dev, NULL);
1753
1754         /* close slave before restoring its mac address */
1755         dev_close(slave_dev);
1756
1757         /* restore original ("permanent") mac address */
1758         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1759         addr.sa_family = slave_dev->type;
1760         dev_set_mac_address(slave_dev, &addr);
1761
1762         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1763                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1764                                    IFF_SLAVE_NEEDARP);
1765
1766         kfree(slave);
1767
1768         return 0;  /* deletion OK */
1769 }
1770
1771 /*
1772  * This function releases all slaves.
1773  */
1774 static int bond_release_all(struct net_device *bond_dev)
1775 {
1776         struct bonding *bond = bond_dev->priv;
1777         struct slave *slave;
1778         struct net_device *slave_dev;
1779         struct sockaddr addr;
1780
1781         write_lock_bh(&bond->lock);
1782
1783         netif_carrier_off(bond_dev);
1784
1785         if (bond->slave_cnt == 0) {
1786                 goto out;
1787         }
1788
1789         bond->current_arp_slave = NULL;
1790         bond->primary_slave = NULL;
1791         bond_change_active_slave(bond, NULL);
1792
1793         while ((slave = bond->first_slave) != NULL) {
1794                 /* Inform AD package of unbinding of slave
1795                  * before slave is detached from the list.
1796                  */
1797                 if (bond->params.mode == BOND_MODE_8023AD) {
1798                         bond_3ad_unbind_slave(slave);
1799                 }
1800
1801                 slave_dev = slave->dev;
1802                 bond_detach_slave(bond, slave);
1803
1804                 if ((bond->params.mode == BOND_MODE_TLB) ||
1805                     (bond->params.mode == BOND_MODE_ALB)) {
1806                         /* must be called only after the slave
1807                          * has been detached from the list
1808                          */
1809                         bond_alb_deinit_slave(bond, slave);
1810                 }
1811
1812                 bond_compute_features(bond);
1813
1814                 /* now that the slave is detached, unlock and perform
1815                  * all the undo steps that should not be called from
1816                  * within a lock.
1817                  */
1818                 write_unlock_bh(&bond->lock);
1819
1820                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1821                 bond_del_vlans_from_slave(bond, slave_dev);
1822
1823                 /* If the mode USES_PRIMARY, then we should only remove its
1824                  * promisc and mc settings if it was the curr_active_slave, but that was
1825                  * already taken care of above when we detached the slave
1826                  */
1827                 if (!USES_PRIMARY(bond->params.mode)) {
1828                         /* unset promiscuity level from slave */
1829                         if (bond_dev->flags & IFF_PROMISC) {
1830                                 dev_set_promiscuity(slave_dev, -1);
1831                         }
1832
1833                         /* unset allmulti level from slave */
1834                         if (bond_dev->flags & IFF_ALLMULTI) {
1835                                 dev_set_allmulti(slave_dev, -1);
1836                         }
1837
1838                         /* flush master's mc_list from slave */
1839                         bond_mc_list_flush(bond_dev, slave_dev);
1840                 }
1841
1842                 netdev_set_master(slave_dev, NULL);
1843
1844                 /* close slave before restoring its mac address */
1845                 dev_close(slave_dev);
1846
1847                 /* restore original ("permanent") mac address*/
1848                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1849                 addr.sa_family = slave_dev->type;
1850                 dev_set_mac_address(slave_dev, &addr);
1851
1852                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1853                                            IFF_SLAVE_INACTIVE);
1854
1855                 kfree(slave);
1856
1857                 /* re-acquire the lock before getting the next slave */
1858                 write_lock_bh(&bond->lock);
1859         }
1860
1861         /* zero the mac address of the master so it will be
1862          * set by the application to the mac address of the
1863          * first slave
1864          */
1865         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1866
1867         if (list_empty(&bond->vlan_list)) {
1868                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1869         } else {
1870                 printk(KERN_WARNING DRV_NAME
1871                        ": %s: Warning: clearing HW address of %s while it "
1872                        "still has VLANs.\n",
1873                        bond_dev->name, bond_dev->name);
1874                 printk(KERN_WARNING DRV_NAME
1875                        ": %s: When re-adding slaves, make sure the bond's "
1876                        "HW address matches its VLANs'.\n",
1877                        bond_dev->name);
1878         }
1879
1880         printk(KERN_INFO DRV_NAME
1881                ": %s: released all slaves\n",
1882                bond_dev->name);
1883
1884 out:
1885         write_unlock_bh(&bond->lock);
1886
1887         return 0;
1888 }
1889
1890 /*
1891  * This function changes the active slave to slave <slave_dev>.
1892  * It returns -EINVAL in the following cases.
1893  *  - <slave_dev> is not found in the list.
1894  *  - There is not active slave now.
1895  *  - <slave_dev> is already active.
1896  *  - The link state of <slave_dev> is not BOND_LINK_UP.
1897  *  - <slave_dev> is not running.
1898  * In these cases, this fuction does nothing.
1899  * In the other cases, currnt_slave pointer is changed and 0 is returned.
1900  */
1901 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
1902 {
1903         struct bonding *bond = bond_dev->priv;
1904         struct slave *old_active = NULL;
1905         struct slave *new_active = NULL;
1906         int res = 0;
1907
1908         if (!USES_PRIMARY(bond->params.mode)) {
1909                 return -EINVAL;
1910         }
1911
1912         /* Verify that master_dev is indeed the master of slave_dev */
1913         if (!(slave_dev->flags & IFF_SLAVE) ||
1914             (slave_dev->master != bond_dev)) {
1915                 return -EINVAL;
1916         }
1917
1918         write_lock_bh(&bond->lock);
1919
1920         old_active = bond->curr_active_slave;
1921         new_active = bond_get_slave_by_dev(bond, slave_dev);
1922
1923         /*
1924          * Changing to the current active: do nothing; return success.
1925          */
1926         if (new_active && (new_active == old_active)) {
1927                 write_unlock_bh(&bond->lock);
1928                 return 0;
1929         }
1930
1931         if ((new_active) &&
1932             (old_active) &&
1933             (new_active->link == BOND_LINK_UP) &&
1934             IS_UP(new_active->dev)) {
1935                 bond_change_active_slave(bond, new_active);
1936         } else {
1937                 res = -EINVAL;
1938         }
1939
1940         write_unlock_bh(&bond->lock);
1941
1942         return res;
1943 }
1944
1945 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1946 {
1947         struct bonding *bond = bond_dev->priv;
1948
1949         info->bond_mode = bond->params.mode;
1950         info->miimon = bond->params.miimon;
1951
1952         read_lock_bh(&bond->lock);
1953         info->num_slaves = bond->slave_cnt;
1954         read_unlock_bh(&bond->lock);
1955
1956         return 0;
1957 }
1958
1959 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1960 {
1961         struct bonding *bond = bond_dev->priv;
1962         struct slave *slave;
1963         int i, found = 0;
1964
1965         if (info->slave_id < 0) {
1966                 return -ENODEV;
1967         }
1968
1969         read_lock_bh(&bond->lock);
1970
1971         bond_for_each_slave(bond, slave, i) {
1972                 if (i == (int)info->slave_id) {
1973                         found = 1;
1974                         break;
1975                 }
1976         }
1977
1978         read_unlock_bh(&bond->lock);
1979
1980         if (found) {
1981                 strcpy(info->slave_name, slave->dev->name);
1982                 info->link = slave->link;
1983                 info->state = slave->state;
1984                 info->link_failure_count = slave->link_failure_count;
1985         } else {
1986                 return -ENODEV;
1987         }
1988
1989         return 0;
1990 }
1991
1992 /*-------------------------------- Monitoring -------------------------------*/
1993
1994 /* this function is called regularly to monitor each slave's link. */
1995 void bond_mii_monitor(struct net_device *bond_dev)
1996 {
1997         struct bonding *bond = bond_dev->priv;
1998         struct slave *slave, *oldcurrent;
1999         int do_failover = 0;
2000         int delta_in_ticks;
2001         int i;
2002
2003         read_lock(&bond->lock);
2004
2005         delta_in_ticks = (bond->params.miimon * HZ) / 1000;
2006
2007         if (bond->kill_timers) {
2008                 goto out;
2009         }
2010
2011         if (bond->slave_cnt == 0) {
2012                 goto re_arm;
2013         }
2014
2015         /* we will try to read the link status of each of our slaves, and
2016          * set their IFF_RUNNING flag appropriately. For each slave not
2017          * supporting MII status, we won't do anything so that a user-space
2018          * program could monitor the link itself if needed.
2019          */
2020
2021         read_lock(&bond->curr_slave_lock);
2022         oldcurrent = bond->curr_active_slave;
2023         read_unlock(&bond->curr_slave_lock);
2024
2025         bond_for_each_slave(bond, slave, i) {
2026                 struct net_device *slave_dev = slave->dev;
2027                 int link_state;
2028                 u16 old_speed = slave->speed;
2029                 u8 old_duplex = slave->duplex;
2030
2031                 link_state = bond_check_dev_link(bond, slave_dev, 0);
2032
2033                 switch (slave->link) {
2034                 case BOND_LINK_UP:      /* the link was up */
2035                         if (link_state == BMSR_LSTATUS) {
2036                                 /* link stays up, nothing more to do */
2037                                 break;
2038                         } else { /* link going down */
2039                                 slave->link  = BOND_LINK_FAIL;
2040                                 slave->delay = bond->params.downdelay;
2041
2042                                 if (slave->link_failure_count < UINT_MAX) {
2043                                         slave->link_failure_count++;
2044                                 }
2045
2046                                 if (bond->params.downdelay) {
2047                                         printk(KERN_INFO DRV_NAME
2048                                                ": %s: link status down for %s "
2049                                                "interface %s, disabling it in "
2050                                                "%d ms.\n",
2051                                                bond_dev->name,
2052                                                IS_UP(slave_dev)
2053                                                ? ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
2054                                                   ? ((slave == oldcurrent)
2055                                                      ? "active " : "backup ")
2056                                                   : "")
2057                                                : "idle ",
2058                                                slave_dev->name,
2059                                                bond->params.downdelay * bond->params.miimon);
2060                                 }
2061                         }
2062                         /* no break ! fall through the BOND_LINK_FAIL test to
2063                            ensure proper action to be taken
2064                         */
2065                 case BOND_LINK_FAIL:    /* the link has just gone down */
2066                         if (link_state != BMSR_LSTATUS) {
2067                                 /* link stays down */
2068                                 if (slave->delay <= 0) {
2069                                         /* link down for too long time */
2070                                         slave->link = BOND_LINK_DOWN;
2071
2072                                         /* in active/backup mode, we must
2073                                          * completely disable this interface
2074                                          */
2075                                         if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP) ||
2076                                             (bond->params.mode == BOND_MODE_8023AD)) {
2077                                                 bond_set_slave_inactive_flags(slave);
2078                                         }
2079
2080                                         printk(KERN_INFO DRV_NAME
2081                                                ": %s: link status definitely "
2082                                                "down for interface %s, "
2083                                                "disabling it\n",
2084                                                bond_dev->name,
2085                                                slave_dev->name);
2086
2087                                         /* notify ad that the link status has changed */
2088                                         if (bond->params.mode == BOND_MODE_8023AD) {
2089                                                 bond_3ad_handle_link_change(slave, BOND_LINK_DOWN);
2090                                         }
2091
2092                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2093                                             (bond->params.mode == BOND_MODE_ALB)) {
2094                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_DOWN);
2095                                         }
2096
2097                                         if (slave == oldcurrent) {
2098                                                 do_failover = 1;
2099                                         }
2100                                 } else {
2101                                         slave->delay--;
2102                                 }
2103                         } else {
2104                                 /* link up again */
2105                                 slave->link  = BOND_LINK_UP;
2106                                 slave->jiffies = jiffies;
2107                                 printk(KERN_INFO DRV_NAME
2108                                        ": %s: link status up again after %d "
2109                                        "ms for interface %s.\n",
2110                                        bond_dev->name,
2111                                        (bond->params.downdelay - slave->delay) * bond->params.miimon,
2112                                        slave_dev->name);
2113                         }
2114                         break;
2115                 case BOND_LINK_DOWN:    /* the link was down */
2116                         if (link_state != BMSR_LSTATUS) {
2117                                 /* the link stays down, nothing more to do */
2118                                 break;
2119                         } else {        /* link going up */
2120                                 slave->link  = BOND_LINK_BACK;
2121                                 slave->delay = bond->params.updelay;
2122
2123                                 if (bond->params.updelay) {
2124                                         /* if updelay == 0, no need to
2125                                            advertise about a 0 ms delay */
2126                                         printk(KERN_INFO DRV_NAME
2127                                                ": %s: link status up for "
2128                                                "interface %s, enabling it "
2129                                                "in %d ms.\n",
2130                                                bond_dev->name,
2131                                                slave_dev->name,
2132                                                bond->params.updelay * bond->params.miimon);
2133                                 }
2134                         }
2135                         /* no break ! fall through the BOND_LINK_BACK state in
2136                            case there's something to do.
2137                         */
2138                 case BOND_LINK_BACK:    /* the link has just come back */
2139                         if (link_state != BMSR_LSTATUS) {
2140                                 /* link down again */
2141                                 slave->link  = BOND_LINK_DOWN;
2142
2143                                 printk(KERN_INFO DRV_NAME
2144                                        ": %s: link status down again after %d "
2145                                        "ms for interface %s.\n",
2146                                        bond_dev->name,
2147                                        (bond->params.updelay - slave->delay) * bond->params.miimon,
2148                                        slave_dev->name);
2149                         } else {
2150                                 /* link stays up */
2151                                 if (slave->delay == 0) {
2152                                         /* now the link has been up for long time enough */
2153                                         slave->link = BOND_LINK_UP;
2154                                         slave->jiffies = jiffies;
2155
2156                                         if (bond->params.mode == BOND_MODE_8023AD) {
2157                                                 /* prevent it from being the active one */
2158                                                 slave->state = BOND_STATE_BACKUP;
2159                                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2160                                                 /* make it immediately active */
2161                                                 slave->state = BOND_STATE_ACTIVE;
2162                                         } else if (slave != bond->primary_slave) {
2163                                                 /* prevent it from being the active one */
2164                                                 slave->state = BOND_STATE_BACKUP;
2165                                         }
2166
2167                                         printk(KERN_INFO DRV_NAME
2168                                                ": %s: link status definitely "
2169                                                "up for interface %s.\n",
2170                                                bond_dev->name,
2171                                                slave_dev->name);
2172
2173                                         /* notify ad that the link status has changed */
2174                                         if (bond->params.mode == BOND_MODE_8023AD) {
2175                                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2176                                         }
2177
2178                                         if ((bond->params.mode == BOND_MODE_TLB) ||
2179                                             (bond->params.mode == BOND_MODE_ALB)) {
2180                                                 bond_alb_handle_link_change(bond, slave, BOND_LINK_UP);
2181                                         }
2182
2183                                         if ((!oldcurrent) ||
2184                                             (slave == bond->primary_slave)) {
2185                                                 do_failover = 1;
2186                                         }
2187                                 } else {
2188                                         slave->delay--;
2189                                 }
2190                         }
2191                         break;
2192                 default:
2193                         /* Should not happen */
2194                         printk(KERN_ERR DRV_NAME
2195                                ": %s: Error: %s Illegal value (link=%d)\n",
2196                                bond_dev->name,
2197                                slave->dev->name,
2198                                slave->link);
2199                         goto out;
2200                 } /* end of switch (slave->link) */
2201
2202                 bond_update_speed_duplex(slave);
2203
2204                 if (bond->params.mode == BOND_MODE_8023AD) {
2205                         if (old_speed != slave->speed) {
2206                                 bond_3ad_adapter_speed_changed(slave);
2207                         }
2208
2209                         if (old_duplex != slave->duplex) {
2210                                 bond_3ad_adapter_duplex_changed(slave);
2211                         }
2212                 }
2213
2214         } /* end of for */
2215
2216         if (do_failover) {
2217                 write_lock(&bond->curr_slave_lock);
2218
2219                 bond_select_active_slave(bond);
2220
2221                 write_unlock(&bond->curr_slave_lock);
2222         } else
2223                 bond_set_carrier(bond);
2224
2225 re_arm:
2226         if (bond->params.miimon) {
2227                 mod_timer(&bond->mii_timer, jiffies + delta_in_ticks);
2228         }
2229 out:
2230         read_unlock(&bond->lock);
2231 }
2232
2233
2234 static u32 bond_glean_dev_ip(struct net_device *dev)
2235 {
2236         struct in_device *idev;
2237         struct in_ifaddr *ifa;
2238         __be32 addr = 0;
2239
2240         if (!dev)
2241                 return 0;
2242
2243         rcu_read_lock();
2244         idev = __in_dev_get_rcu(dev);
2245         if (!idev)
2246                 goto out;
2247
2248         ifa = idev->ifa_list;
2249         if (!ifa)
2250                 goto out;
2251
2252         addr = ifa->ifa_local;
2253 out:
2254         rcu_read_unlock();
2255         return addr;
2256 }
2257
2258 static int bond_has_ip(struct bonding *bond)
2259 {
2260         struct vlan_entry *vlan, *vlan_next;
2261
2262         if (bond->master_ip)
2263                 return 1;
2264
2265         if (list_empty(&bond->vlan_list))
2266                 return 0;
2267
2268         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2269                                  vlan_list) {
2270                 if (vlan->vlan_ip)
2271                         return 1;
2272         }
2273
2274         return 0;
2275 }
2276
2277 static int bond_has_this_ip(struct bonding *bond, u32 ip)
2278 {
2279         struct vlan_entry *vlan, *vlan_next;
2280
2281         if (ip == bond->master_ip)
2282                 return 1;
2283
2284         if (list_empty(&bond->vlan_list))
2285                 return 0;
2286
2287         list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2288                                  vlan_list) {
2289                 if (ip == vlan->vlan_ip)
2290                         return 1;
2291         }
2292
2293         return 0;
2294 }
2295
2296 /*
2297  * We go to the (large) trouble of VLAN tagging ARP frames because
2298  * switches in VLAN mode (especially if ports are configured as
2299  * "native" to a VLAN) might not pass non-tagged frames.
2300  */
2301 static void bond_arp_send(struct net_device *slave_dev, int arp_op, u32 dest_ip, u32 src_ip, unsigned short vlan_id)
2302 {
2303         struct sk_buff *skb;
2304
2305         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2306                slave_dev->name, dest_ip, src_ip, vlan_id);
2307                
2308         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2309                          NULL, slave_dev->dev_addr, NULL);
2310
2311         if (!skb) {
2312                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2313                 return;
2314         }
2315         if (vlan_id) {
2316                 skb = vlan_put_tag(skb, vlan_id);
2317                 if (!skb) {
2318                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2319                         return;
2320                 }
2321         }
2322         arp_xmit(skb);
2323 }
2324
2325
2326 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2327 {
2328         int i, vlan_id, rv;
2329         u32 *targets = bond->params.arp_targets;
2330         struct vlan_entry *vlan, *vlan_next;
2331         struct net_device *vlan_dev;
2332         struct flowi fl;
2333         struct rtable *rt;
2334
2335         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2336                 if (!targets[i])
2337                         continue;
2338                 dprintk("basa: target %x\n", targets[i]);
2339                 if (list_empty(&bond->vlan_list)) {
2340                         dprintk("basa: empty vlan: arp_send\n");
2341                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2342                                       bond->master_ip, 0);
2343                         continue;
2344                 }
2345
2346                 /*
2347                  * If VLANs are configured, we do a route lookup to
2348                  * determine which VLAN interface would be used, so we
2349                  * can tag the ARP with the proper VLAN tag.
2350                  */
2351                 memset(&fl, 0, sizeof(fl));
2352                 fl.fl4_dst = targets[i];
2353                 fl.fl4_tos = RTO_ONLINK;
2354
2355                 rv = ip_route_output_key(&rt, &fl);
2356                 if (rv) {
2357                         if (net_ratelimit()) {
2358                                 printk(KERN_WARNING DRV_NAME
2359                              ": %s: no route to arp_ip_target %u.%u.%u.%u\n",
2360                                        bond->dev->name, NIPQUAD(fl.fl4_dst));
2361                         }
2362                         continue;
2363                 }
2364
2365                 /*
2366                  * This target is not on a VLAN
2367                  */
2368                 if (rt->u.dst.dev == bond->dev) {
2369                         ip_rt_put(rt);
2370                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2371                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2372                                       bond->master_ip, 0);
2373                         continue;
2374                 }
2375
2376                 vlan_id = 0;
2377                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
2378                                          vlan_list) {
2379                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2380                         if (vlan_dev == rt->u.dst.dev) {
2381                                 vlan_id = vlan->vlan_id;
2382                                 dprintk("basa: vlan match on %s %d\n",
2383                                        vlan_dev->name, vlan_id);
2384                                 break;
2385                         }
2386                 }
2387
2388                 if (vlan_id) {
2389                         ip_rt_put(rt);
2390                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2391                                       vlan->vlan_ip, vlan_id);
2392                         continue;
2393                 }
2394
2395                 if (net_ratelimit()) {
2396                         printk(KERN_WARNING DRV_NAME
2397                ": %s: no path to arp_ip_target %u.%u.%u.%u via rt.dev %s\n",
2398                                bond->dev->name, NIPQUAD(fl.fl4_dst),
2399                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2400                 }
2401                 ip_rt_put(rt);
2402         }
2403 }
2404
2405 /*
2406  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2407  * for each VLAN above us.
2408  */
2409 static void bond_send_gratuitous_arp(struct bonding *bond)
2410 {
2411         struct slave *slave = bond->curr_active_slave;
2412         struct vlan_entry *vlan;
2413         struct net_device *vlan_dev;
2414
2415         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2416                                 slave ? slave->dev->name : "NULL");
2417         if (!slave)
2418                 return;
2419
2420         if (bond->master_ip) {
2421                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2422                                   bond->master_ip, 0);
2423         }
2424
2425         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2426                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2427                 if (vlan->vlan_ip) {
2428                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2429                                       vlan->vlan_ip, vlan->vlan_id);
2430                 }
2431         }
2432 }
2433
2434 static void bond_validate_arp(struct bonding *bond, struct slave *slave, u32 sip, u32 tip)
2435 {
2436         int i;
2437         u32 *targets = bond->params.arp_targets;
2438
2439         targets = bond->params.arp_targets;
2440         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2441                 dprintk("bva: sip %u.%u.%u.%u tip %u.%u.%u.%u t[%d] "
2442                         "%u.%u.%u.%u bhti(tip) %d\n",
2443                        NIPQUAD(sip), NIPQUAD(tip), i, NIPQUAD(targets[i]),
2444                        bond_has_this_ip(bond, tip));
2445                 if (sip == targets[i]) {
2446                         if (bond_has_this_ip(bond, tip))
2447                                 slave->last_arp_rx = jiffies;
2448                         return;
2449                 }
2450         }
2451 }
2452
2453 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2454 {
2455         struct arphdr *arp;
2456         struct slave *slave;
2457         struct bonding *bond;
2458         unsigned char *arp_ptr;
2459         u32 sip, tip;
2460
2461         if (dev->nd_net != &init_net)
2462                 goto out;
2463
2464         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2465                 goto out;
2466
2467         bond = dev->priv;
2468         read_lock(&bond->lock);
2469
2470         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2471                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2472                 orig_dev ? orig_dev->name : "NULL");
2473
2474         slave = bond_get_slave_by_dev(bond, orig_dev);
2475         if (!slave || !slave_do_arp_validate(bond, slave))
2476                 goto out_unlock;
2477
2478         /* ARP header, plus 2 device addresses, plus 2 IP addresses.  */
2479         if (!pskb_may_pull(skb, (sizeof(struct arphdr) +
2480                                  (2 * dev->addr_len) +
2481                                  (2 * sizeof(u32)))))
2482                 goto out_unlock;
2483
2484         arp = arp_hdr(skb);
2485         if (arp->ar_hln != dev->addr_len ||
2486             skb->pkt_type == PACKET_OTHERHOST ||
2487             skb->pkt_type == PACKET_LOOPBACK ||
2488             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2489             arp->ar_pro != htons(ETH_P_IP) ||
2490             arp->ar_pln != 4)
2491                 goto out_unlock;
2492
2493         arp_ptr = (unsigned char *)(arp + 1);
2494         arp_ptr += dev->addr_len;
2495         memcpy(&sip, arp_ptr, 4);
2496         arp_ptr += 4 + dev->addr_len;
2497         memcpy(&tip, arp_ptr, 4);
2498
2499         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %u.%u.%u.%u"
2500                 " tip %u.%u.%u.%u\n", bond->dev->name, slave->dev->name,
2501                 slave->state, bond->params.arp_validate,
2502                 slave_do_arp_validate(bond, slave), NIPQUAD(sip), NIPQUAD(tip));
2503
2504         /*
2505          * Backup slaves won't see the ARP reply, but do come through
2506          * here for each ARP probe (so we swap the sip/tip to validate
2507          * the probe).  In a "redundant switch, common router" type of
2508          * configuration, the ARP probe will (hopefully) travel from
2509          * the active, through one switch, the router, then the other
2510          * switch before reaching the backup.
2511          */
2512         if (slave->state == BOND_STATE_ACTIVE)
2513                 bond_validate_arp(bond, slave, sip, tip);
2514         else
2515                 bond_validate_arp(bond, slave, tip, sip);
2516
2517 out_unlock:
2518         read_unlock(&bond->lock);
2519 out:
2520         dev_kfree_skb(skb);
2521         return NET_RX_SUCCESS;
2522 }
2523
2524 /*
2525  * this function is called regularly to monitor each slave's link
2526  * ensuring that traffic is being sent and received when arp monitoring
2527  * is used in load-balancing mode. if the adapter has been dormant, then an
2528  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2529  * arp monitoring in active backup mode.
2530  */
2531 void bond_loadbalance_arp_mon(struct net_device *bond_dev)
2532 {
2533         struct bonding *bond = bond_dev->priv;
2534         struct slave *slave, *oldcurrent;
2535         int do_failover = 0;
2536         int delta_in_ticks;
2537         int i;
2538
2539         read_lock(&bond->lock);
2540
2541         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2542
2543         if (bond->kill_timers) {
2544                 goto out;
2545         }
2546
2547         if (bond->slave_cnt == 0) {
2548                 goto re_arm;
2549         }
2550
2551         read_lock(&bond->curr_slave_lock);
2552         oldcurrent = bond->curr_active_slave;
2553         read_unlock(&bond->curr_slave_lock);
2554
2555         /* see if any of the previous devices are up now (i.e. they have
2556          * xmt and rcv traffic). the curr_active_slave does not come into
2557          * the picture unless it is null. also, slave->jiffies is not needed
2558          * here because we send an arp on each slave and give a slave as
2559          * long as it needs to get the tx/rx within the delta.
2560          * TODO: what about up/down delay in arp mode? it wasn't here before
2561          *       so it can wait
2562          */
2563         bond_for_each_slave(bond, slave, i) {
2564                 if (slave->link != BOND_LINK_UP) {
2565                         if (((jiffies - slave->dev->trans_start) <= delta_in_ticks) &&
2566                             ((jiffies - slave->dev->last_rx) <= delta_in_ticks)) {
2567
2568                                 slave->link  = BOND_LINK_UP;
2569                                 slave->state = BOND_STATE_ACTIVE;
2570
2571                                 /* primary_slave has no meaning in round-robin
2572                                  * mode. the window of a slave being up and
2573                                  * curr_active_slave being null after enslaving
2574                                  * is closed.
2575                                  */
2576                                 if (!oldcurrent) {
2577                                         printk(KERN_INFO DRV_NAME
2578                                                ": %s: link status definitely "
2579                                                "up for interface %s, ",
2580                                                bond_dev->name,
2581                                                slave->dev->name);
2582                                         do_failover = 1;
2583                                 } else {
2584                                         printk(KERN_INFO DRV_NAME
2585                                                ": %s: interface %s is now up\n",
2586                                                bond_dev->name,
2587                                                slave->dev->name);
2588                                 }
2589                         }
2590                 } else {
2591                         /* slave->link == BOND_LINK_UP */
2592
2593                         /* not all switches will respond to an arp request
2594                          * when the source ip is 0, so don't take the link down
2595                          * if we don't know our ip yet
2596                          */
2597                         if (((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2598                             (((jiffies - slave->dev->last_rx) >= (2*delta_in_ticks)) &&
2599                              bond_has_ip(bond))) {
2600
2601                                 slave->link  = BOND_LINK_DOWN;
2602                                 slave->state = BOND_STATE_BACKUP;
2603
2604                                 if (slave->link_failure_count < UINT_MAX) {
2605                                         slave->link_failure_count++;
2606                                 }
2607
2608                                 printk(KERN_INFO DRV_NAME
2609                                        ": %s: interface %s is now down.\n",
2610                                        bond_dev->name,
2611                                        slave->dev->name);
2612
2613                                 if (slave == oldcurrent) {
2614                                         do_failover = 1;
2615                                 }
2616                         }
2617                 }
2618
2619                 /* note: if switch is in round-robin mode, all links
2620                  * must tx arp to ensure all links rx an arp - otherwise
2621                  * links may oscillate or not come up at all; if switch is
2622                  * in something like xor mode, there is nothing we can
2623                  * do - all replies will be rx'ed on same link causing slaves
2624                  * to be unstable during low/no traffic periods
2625                  */
2626                 if (IS_UP(slave->dev)) {
2627                         bond_arp_send_all(bond, slave);
2628                 }
2629         }
2630
2631         if (do_failover) {
2632                 write_lock(&bond->curr_slave_lock);
2633
2634                 bond_select_active_slave(bond);
2635
2636                 write_unlock(&bond->curr_slave_lock);
2637         }
2638
2639 re_arm:
2640         if (bond->params.arp_interval) {
2641                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2642         }
2643 out:
2644         read_unlock(&bond->lock);
2645 }
2646
2647 /*
2648  * When using arp monitoring in active-backup mode, this function is
2649  * called to determine if any backup slaves have went down or a new
2650  * current slave needs to be found.
2651  * The backup slaves never generate traffic, they are considered up by merely
2652  * receiving traffic. If the current slave goes down, each backup slave will
2653  * be given the opportunity to tx/rx an arp before being taken down - this
2654  * prevents all slaves from being taken down due to the current slave not
2655  * sending any traffic for the backups to receive. The arps are not necessarily
2656  * necessary, any tx and rx traffic will keep the current slave up. While any
2657  * rx traffic will keep the backup slaves up, the current slave is responsible
2658  * for generating traffic to keep them up regardless of any other traffic they
2659  * may have received.
2660  * see loadbalance_arp_monitor for arp monitoring in load balancing mode
2661  */
2662 void bond_activebackup_arp_mon(struct net_device *bond_dev)
2663 {
2664         struct bonding *bond = bond_dev->priv;
2665         struct slave *slave;
2666         int delta_in_ticks;
2667         int i;
2668
2669         read_lock(&bond->lock);
2670
2671         delta_in_ticks = (bond->params.arp_interval * HZ) / 1000;
2672
2673         if (bond->kill_timers) {
2674                 goto out;
2675         }
2676
2677         if (bond->slave_cnt == 0) {
2678                 goto re_arm;
2679         }
2680
2681         /* determine if any slave has come up or any backup slave has
2682          * gone down
2683          * TODO: what about up/down delay in arp mode? it wasn't here before
2684          *       so it can wait
2685          */
2686         bond_for_each_slave(bond, slave, i) {
2687                 if (slave->link != BOND_LINK_UP) {
2688                         if ((jiffies - slave_last_rx(bond, slave)) <=
2689                              delta_in_ticks) {
2690
2691                                 slave->link = BOND_LINK_UP;
2692
2693                                 write_lock(&bond->curr_slave_lock);
2694
2695                                 if ((!bond->curr_active_slave) &&
2696                                     ((jiffies - slave->dev->trans_start) <= delta_in_ticks)) {
2697                                         bond_change_active_slave(bond, slave);
2698                                         bond->current_arp_slave = NULL;
2699                                 } else if (bond->curr_active_slave != slave) {
2700                                         /* this slave has just come up but we
2701                                          * already have a current slave; this
2702                                          * can also happen if bond_enslave adds
2703                                          * a new slave that is up while we are
2704                                          * searching for a new slave
2705                                          */
2706                                         bond_set_slave_inactive_flags(slave);
2707                                         bond->current_arp_slave = NULL;
2708                                 }
2709
2710                                 bond_set_carrier(bond);
2711
2712                                 if (slave == bond->curr_active_slave) {
2713                                         printk(KERN_INFO DRV_NAME
2714                                                ": %s: %s is up and now the "
2715                                                "active interface\n",
2716                                                bond_dev->name,
2717                                                slave->dev->name);
2718                                         netif_carrier_on(bond->dev);
2719                                 } else {
2720                                         printk(KERN_INFO DRV_NAME
2721                                                ": %s: backup interface %s is "
2722                                                "now up\n",
2723                                                bond_dev->name,
2724                                                slave->dev->name);
2725                                 }
2726
2727                                 write_unlock(&bond->curr_slave_lock);
2728                         }
2729                 } else {
2730                         read_lock(&bond->curr_slave_lock);
2731
2732                         if ((slave != bond->curr_active_slave) &&
2733                             (!bond->current_arp_slave) &&
2734                             (((jiffies - slave_last_rx(bond, slave)) >= 3*delta_in_ticks) &&
2735                              bond_has_ip(bond))) {
2736                                 /* a backup slave has gone down; three times
2737                                  * the delta allows the current slave to be
2738                                  * taken out before the backup slave.
2739                                  * note: a non-null current_arp_slave indicates
2740                                  * the curr_active_slave went down and we are
2741                                  * searching for a new one; under this
2742                                  * condition we only take the curr_active_slave
2743                                  * down - this gives each slave a chance to
2744                                  * tx/rx traffic before being taken out
2745                                  */
2746
2747                                 read_unlock(&bond->curr_slave_lock);
2748
2749                                 slave->link  = BOND_LINK_DOWN;
2750
2751                                 if (slave->link_failure_count < UINT_MAX) {
2752                                         slave->link_failure_count++;
2753                                 }
2754
2755                                 bond_set_slave_inactive_flags(slave);
2756
2757                                 printk(KERN_INFO DRV_NAME
2758                                        ": %s: backup interface %s is now down\n",
2759                                        bond_dev->name,
2760                                        slave->dev->name);
2761                         } else {
2762                                 read_unlock(&bond->curr_slave_lock);
2763                         }
2764                 }
2765         }
2766
2767         read_lock(&bond->curr_slave_lock);
2768         slave = bond->curr_active_slave;
2769         read_unlock(&bond->curr_slave_lock);
2770
2771         if (slave) {
2772                 /* if we have sent traffic in the past 2*arp_intervals but
2773                  * haven't xmit and rx traffic in that time interval, select
2774                  * a different slave. slave->jiffies is only updated when
2775                  * a slave first becomes the curr_active_slave - not necessarily
2776                  * after every arp; this ensures the slave has a full 2*delta
2777                  * before being taken out. if a primary is being used, check
2778                  * if it is up and needs to take over as the curr_active_slave
2779                  */
2780                 if ((((jiffies - slave->dev->trans_start) >= (2*delta_in_ticks)) ||
2781             (((jiffies - slave_last_rx(bond, slave)) >= (2*delta_in_ticks)) &&
2782              bond_has_ip(bond))) &&
2783                     ((jiffies - slave->jiffies) >= 2*delta_in_ticks)) {
2784
2785                         slave->link  = BOND_LINK_DOWN;
2786
2787                         if (slave->link_failure_count < UINT_MAX) {
2788                                 slave->link_failure_count++;
2789                         }
2790
2791                         printk(KERN_INFO DRV_NAME
2792                                ": %s: link status down for active interface "
2793                                "%s, disabling it\n",
2794                                bond_dev->name,
2795                                slave->dev->name);
2796
2797                         write_lock(&bond->curr_slave_lock);
2798
2799                         bond_select_active_slave(bond);
2800                         slave = bond->curr_active_slave;
2801
2802                         write_unlock(&bond->curr_slave_lock);
2803
2804                         bond->current_arp_slave = slave;
2805
2806                         if (slave) {
2807                                 slave->jiffies = jiffies;
2808                         }
2809                 } else if ((bond->primary_slave) &&
2810                            (bond->primary_slave != slave) &&
2811                            (bond->primary_slave->link == BOND_LINK_UP)) {
2812                         /* at this point, slave is the curr_active_slave */
2813                         printk(KERN_INFO DRV_NAME
2814                                ": %s: changing from interface %s to primary "
2815                                "interface %s\n",
2816                                bond_dev->name,
2817                                slave->dev->name,
2818                                bond->primary_slave->dev->name);
2819
2820                         /* primary is up so switch to it */
2821                         write_lock(&bond->curr_slave_lock);
2822                         bond_change_active_slave(bond, bond->primary_slave);
2823                         write_unlock(&bond->curr_slave_lock);
2824
2825                         slave = bond->primary_slave;
2826                         slave->jiffies = jiffies;
2827                 } else {
2828                         bond->current_arp_slave = NULL;
2829                 }
2830
2831                 /* the current slave must tx an arp to ensure backup slaves
2832                  * rx traffic
2833                  */
2834                 if (slave && bond_has_ip(bond)) {
2835                         bond_arp_send_all(bond, slave);
2836                 }
2837         }
2838
2839         /* if we don't have a curr_active_slave, search for the next available
2840          * backup slave from the current_arp_slave and make it the candidate
2841          * for becoming the curr_active_slave
2842          */
2843         if (!slave) {
2844                 if (!bond->current_arp_slave) {
2845                         bond->current_arp_slave = bond->first_slave;
2846                 }
2847
2848                 if (bond->current_arp_slave) {
2849                         bond_set_slave_inactive_flags(bond->current_arp_slave);
2850
2851                         /* search for next candidate */
2852                         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
2853                                 if (IS_UP(slave->dev)) {
2854                                         slave->link = BOND_LINK_BACK;
2855                                         bond_set_slave_active_flags(slave);
2856                                         bond_arp_send_all(bond, slave);
2857                                         slave->jiffies = jiffies;
2858                                         bond->current_arp_slave = slave;
2859                                         break;
2860                                 }
2861
2862                                 /* if the link state is up at this point, we
2863                                  * mark it down - this can happen if we have
2864                                  * simultaneous link failures and
2865                                  * reselect_active_interface doesn't make this
2866                                  * one the current slave so it is still marked
2867                                  * up when it is actually down
2868                                  */
2869                                 if (slave->link == BOND_LINK_UP) {
2870                                         slave->link  = BOND_LINK_DOWN;
2871                                         if (slave->link_failure_count < UINT_MAX) {
2872                                                 slave->link_failure_count++;
2873                                         }
2874
2875                                         bond_set_slave_inactive_flags(slave);
2876
2877                                         printk(KERN_INFO DRV_NAME
2878                                                ": %s: backup interface %s is "
2879                                                "now down.\n",
2880                                                bond_dev->name,
2881                                                slave->dev->name);
2882                                 }
2883                         }
2884                 }
2885         }
2886
2887 re_arm:
2888         if (bond->params.arp_interval) {
2889                 mod_timer(&bond->arp_timer, jiffies + delta_in_ticks);
2890         }
2891 out:
2892         read_unlock(&bond->lock);
2893 }
2894
2895 /*------------------------------ proc/seq_file-------------------------------*/
2896
2897 #ifdef CONFIG_PROC_FS
2898
2899 #define SEQ_START_TOKEN ((void *)1)
2900
2901 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
2902 {
2903         struct bonding *bond = seq->private;
2904         loff_t off = 0;
2905         struct slave *slave;
2906         int i;
2907
2908         /* make sure the bond won't be taken away */
2909         read_lock(&dev_base_lock);
2910         read_lock_bh(&bond->lock);
2911
2912         if (*pos == 0) {
2913                 return SEQ_START_TOKEN;
2914         }
2915
2916         bond_for_each_slave(bond, slave, i) {
2917                 if (++off == *pos) {
2918                         return slave;
2919                 }
2920         }
2921
2922         return NULL;
2923 }
2924
2925 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2926 {
2927         struct bonding *bond = seq->private;
2928         struct slave *slave = v;
2929
2930         ++*pos;
2931         if (v == SEQ_START_TOKEN) {
2932                 return bond->first_slave;
2933         }
2934
2935         slave = slave->next;
2936
2937         return (slave == bond->first_slave) ? NULL : slave;
2938 }
2939
2940 static void bond_info_seq_stop(struct seq_file *seq, void *v)
2941 {
2942         struct bonding *bond = seq->private;
2943
2944         read_unlock_bh(&bond->lock);
2945         read_unlock(&dev_base_lock);
2946 }
2947
2948 static void bond_info_show_master(struct seq_file *seq)
2949 {
2950         struct bonding *bond = seq->private;
2951         struct slave *curr;
2952         int i;
2953         u32 target;
2954
2955         read_lock(&bond->curr_slave_lock);
2956         curr = bond->curr_active_slave;
2957         read_unlock(&bond->curr_slave_lock);
2958
2959         seq_printf(seq, "Bonding Mode: %s\n",
2960                    bond_mode_name(bond->params.mode));
2961
2962         if (bond->params.mode == BOND_MODE_XOR ||
2963                 bond->params.mode == BOND_MODE_8023AD) {
2964                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
2965                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
2966                         bond->params.xmit_policy);
2967         }
2968
2969         if (USES_PRIMARY(bond->params.mode)) {
2970                 seq_printf(seq, "Primary Slave: %s\n",
2971                            (bond->primary_slave) ?
2972                            bond->primary_slave->dev->name : "None");
2973
2974                 seq_printf(seq, "Currently Active Slave: %s\n",
2975                            (curr) ? curr->dev->name : "None");
2976         }
2977
2978         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
2979                    "up" : "down");
2980         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
2981         seq_printf(seq, "Up Delay (ms): %d\n",
2982                    bond->params.updelay * bond->params.miimon);
2983         seq_printf(seq, "Down Delay (ms): %d\n",
2984                    bond->params.downdelay * bond->params.miimon);
2985
2986
2987         /* ARP information */
2988         if(bond->params.arp_interval > 0) {
2989                 int printed=0;
2990                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
2991                                 bond->params.arp_interval);
2992
2993                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
2994
2995                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
2996                         if (!bond->params.arp_targets[i])
2997                                 continue;
2998                         if (printed)
2999                                 seq_printf(seq, ",");
3000                         target = ntohl(bond->params.arp_targets[i]);
3001                         seq_printf(seq, " %d.%d.%d.%d", HIPQUAD(target));
3002                         printed = 1;
3003                 }
3004                 seq_printf(seq, "\n");
3005         }
3006
3007         if (bond->params.mode == BOND_MODE_8023AD) {
3008                 struct ad_info ad_info;
3009
3010                 seq_puts(seq, "\n802.3ad info\n");
3011                 seq_printf(seq, "LACP rate: %s\n",
3012                            (bond->params.lacp_fast) ? "fast" : "slow");
3013
3014                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3015                         seq_printf(seq, "bond %s has no active aggregator\n",
3016                                    bond->dev->name);
3017                 } else {
3018                         seq_printf(seq, "Active Aggregator Info:\n");
3019
3020                         seq_printf(seq, "\tAggregator ID: %d\n",
3021                                    ad_info.aggregator_id);
3022                         seq_printf(seq, "\tNumber of ports: %d\n",
3023                                    ad_info.ports);
3024                         seq_printf(seq, "\tActor Key: %d\n",
3025                                    ad_info.actor_key);
3026                         seq_printf(seq, "\tPartner Key: %d\n",
3027                                    ad_info.partner_key);
3028                         seq_printf(seq, "\tPartner Mac Address: %02x:%02x:%02x:%02x:%02x:%02x\n",
3029                                    ad_info.partner_system[0],
3030                                    ad_info.partner_system[1],
3031                                    ad_info.partner_system[2],
3032                                    ad_info.partner_system[3],
3033                                    ad_info.partner_system[4],
3034                                    ad_info.partner_system[5]);
3035                 }
3036         }
3037 }
3038
3039 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3040 {
3041         struct bonding *bond = seq->private;
3042
3043         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3044         seq_printf(seq, "MII Status: %s\n",
3045                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3046         seq_printf(seq, "Link Failure Count: %u\n",
3047                    slave->link_failure_count);
3048
3049         seq_printf(seq,
3050                    "Permanent HW addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
3051                    slave->perm_hwaddr[0], slave->perm_hwaddr[1],
3052                    slave->perm_hwaddr[2], slave->perm_hwaddr[3],
3053                    slave->perm_hwaddr[4], slave->perm_hwaddr[5]);
3054
3055         if (bond->params.mode == BOND_MODE_8023AD) {
3056                 const struct aggregator *agg
3057                         = SLAVE_AD_INFO(slave).port.aggregator;
3058
3059                 if (agg) {
3060                         seq_printf(seq, "Aggregator ID: %d\n",
3061                                    agg->aggregator_identifier);
3062                 } else {
3063                         seq_puts(seq, "Aggregator ID: N/A\n");
3064                 }
3065         }
3066 }
3067
3068 static int bond_info_seq_show(struct seq_file *seq, void *v)
3069 {
3070         if (v == SEQ_START_TOKEN) {
3071                 seq_printf(seq, "%s\n", version);
3072                 bond_info_show_master(seq);
3073         } else {
3074                 bond_info_show_slave(seq, v);
3075         }
3076
3077         return 0;
3078 }
3079
3080 static struct seq_operations bond_info_seq_ops = {
3081         .start = bond_info_seq_start,
3082         .next  = bond_info_seq_next,
3083         .stop  = bond_info_seq_stop,
3084         .show  = bond_info_seq_show,
3085 };
3086
3087 static int bond_info_open(struct inode *inode, struct file *file)
3088 {
3089         struct seq_file *seq;
3090         struct proc_dir_entry *proc;
3091         int res;
3092
3093         res = seq_open(file, &bond_info_seq_ops);
3094         if (!res) {
3095                 /* recover the pointer buried in proc_dir_entry data */
3096                 seq = file->private_data;
3097                 proc = PDE(inode);
3098                 seq->private = proc->data;
3099         }
3100
3101         return res;
3102 }
3103
3104 static const struct file_operations bond_info_fops = {
3105         .owner   = THIS_MODULE,
3106         .open    = bond_info_open,
3107         .read    = seq_read,
3108         .llseek  = seq_lseek,
3109         .release = seq_release,
3110 };
3111
3112 static int bond_create_proc_entry(struct bonding *bond)
3113 {
3114         struct net_device *bond_dev = bond->dev;
3115
3116         if (bond_proc_dir) {
3117                 bond->proc_entry = create_proc_entry(bond_dev->name,
3118                                                      S_IRUGO,
3119                                                      bond_proc_dir);
3120                 if (bond->proc_entry == NULL) {
3121                         printk(KERN_WARNING DRV_NAME
3122                                ": Warning: Cannot create /proc/net/%s/%s\n",
3123                                DRV_NAME, bond_dev->name);
3124                 } else {
3125                         bond->proc_entry->data = bond;
3126                         bond->proc_entry->proc_fops = &bond_info_fops;
3127                         bond->proc_entry->owner = THIS_MODULE;
3128                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3129                 }
3130         }
3131
3132         return 0;
3133 }
3134
3135 static void bond_remove_proc_entry(struct bonding *bond)
3136 {
3137         if (bond_proc_dir && bond->proc_entry) {
3138                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3139                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3140                 bond->proc_entry = NULL;
3141         }
3142 }
3143
3144 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3145  * Caller must hold rtnl_lock.
3146  */
3147 static void bond_create_proc_dir(void)
3148 {
3149         int len = strlen(DRV_NAME);
3150
3151         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3152              bond_proc_dir = bond_proc_dir->next) {
3153                 if ((bond_proc_dir->namelen == len) &&
3154                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3155                         break;
3156                 }
3157         }
3158
3159         if (!bond_proc_dir) {
3160                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3161                 if (bond_proc_dir) {
3162                         bond_proc_dir->owner = THIS_MODULE;
3163                 } else {
3164                         printk(KERN_WARNING DRV_NAME
3165                                 ": Warning: cannot create /proc/net/%s\n",
3166                                 DRV_NAME);
3167                 }
3168         }
3169 }
3170
3171 /* Destroy the bonding directory under /proc/net, if empty.
3172  * Caller must hold rtnl_lock.
3173  */
3174 static void bond_destroy_proc_dir(void)
3175 {
3176         struct proc_dir_entry *de;
3177
3178         if (!bond_proc_dir) {
3179                 return;
3180         }
3181
3182         /* verify that the /proc dir is empty */
3183         for (de = bond_proc_dir->subdir; de; de = de->next) {
3184                 /* ignore . and .. */
3185                 if (*(de->name) != '.') {
3186                         break;
3187                 }
3188         }
3189
3190         if (de) {
3191                 if (bond_proc_dir->owner == THIS_MODULE) {
3192                         bond_proc_dir->owner = NULL;
3193                 }
3194         } else {
3195                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3196                 bond_proc_dir = NULL;
3197         }
3198 }
3199 #endif /* CONFIG_PROC_FS */
3200
3201 /*-------------------------- netdev event handling --------------------------*/
3202
3203 /*
3204  * Change device name
3205  */
3206 static int bond_event_changename(struct bonding *bond)
3207 {
3208 #ifdef CONFIG_PROC_FS
3209         bond_remove_proc_entry(bond);
3210         bond_create_proc_entry(bond);
3211 #endif
3212         down_write(&(bonding_rwsem));
3213         bond_destroy_sysfs_entry(bond);
3214         bond_create_sysfs_entry(bond);
3215         up_write(&(bonding_rwsem));
3216         return NOTIFY_DONE;
3217 }
3218
3219 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3220 {
3221         struct bonding *event_bond = bond_dev->priv;
3222
3223         switch (event) {
3224         case NETDEV_CHANGENAME:
3225                 return bond_event_changename(event_bond);
3226         case NETDEV_UNREGISTER:
3227                 /*
3228                  * TODO: remove a bond from the list?
3229                  */
3230                 break;
3231         default:
3232                 break;
3233         }
3234
3235         return NOTIFY_DONE;
3236 }
3237
3238 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3239 {
3240         struct net_device *bond_dev = slave_dev->master;
3241         struct bonding *bond = bond_dev->priv;
3242
3243         switch (event) {
3244         case NETDEV_UNREGISTER:
3245                 if (bond_dev) {
3246                         bond_release(bond_dev, slave_dev);
3247                 }
3248                 break;
3249         case NETDEV_CHANGE:
3250                 /*
3251                  * TODO: is this what we get if somebody
3252                  * sets up a hierarchical bond, then rmmod's
3253                  * one of the slave bonding devices?
3254                  */
3255                 break;
3256         case NETDEV_DOWN:
3257                 /*
3258                  * ... Or is it this?
3259                  */
3260                 break;
3261         case NETDEV_CHANGEMTU:
3262                 /*
3263                  * TODO: Should slaves be allowed to
3264                  * independently alter their MTU?  For
3265                  * an active-backup bond, slaves need
3266                  * not be the same type of device, so
3267                  * MTUs may vary.  For other modes,
3268                  * slaves arguably should have the
3269                  * same MTUs. To do this, we'd need to
3270                  * take over the slave's change_mtu
3271                  * function for the duration of their
3272                  * servitude.
3273                  */
3274                 break;
3275         case NETDEV_CHANGENAME:
3276                 /*
3277                  * TODO: handle changing the primary's name
3278                  */
3279                 break;
3280         case NETDEV_FEAT_CHANGE:
3281                 bond_compute_features(bond);
3282                 break;
3283         default:
3284                 break;
3285         }
3286
3287         return NOTIFY_DONE;
3288 }
3289
3290 /*
3291  * bond_netdev_event: handle netdev notifier chain events.
3292  *
3293  * This function receives events for the netdev chain.  The caller (an
3294  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3295  * locks for us to safely manipulate the slave devices (RTNL lock,
3296  * dev_probe_lock).
3297  */
3298 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3299 {
3300         struct net_device *event_dev = (struct net_device *)ptr;
3301
3302         dprintk("event_dev: %s, event: %lx\n",
3303                 (event_dev ? event_dev->name : "None"),
3304                 event);
3305
3306         if (!(event_dev->priv_flags & IFF_BONDING))
3307                 return NOTIFY_DONE;
3308
3309         if (event_dev->flags & IFF_MASTER) {
3310                 dprintk("IFF_MASTER\n");
3311                 return bond_master_netdev_event(event, event_dev);
3312         }
3313
3314         if (event_dev->flags & IFF_SLAVE) {
3315                 dprintk("IFF_SLAVE\n");
3316                 return bond_slave_netdev_event(event, event_dev);
3317         }
3318
3319         return NOTIFY_DONE;
3320 }
3321
3322 /*
3323  * bond_inetaddr_event: handle inetaddr notifier chain events.
3324  *
3325  * We keep track of device IPs primarily to use as source addresses in
3326  * ARP monitor probes (rather than spewing out broadcasts all the time).
3327  *
3328  * We track one IP for the main device (if it has one), plus one per VLAN.
3329  */
3330 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3331 {
3332         struct in_ifaddr *ifa = ptr;
3333         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3334         struct bonding *bond, *bond_next;
3335         struct vlan_entry *vlan, *vlan_next;
3336
3337         list_for_each_entry_safe(bond, bond_next, &bond_dev_list, bond_list) {
3338                 if (bond->dev == event_dev) {
3339                         switch (event) {
3340                         case NETDEV_UP:
3341                                 bond->master_ip = ifa->ifa_local;
3342                                 return NOTIFY_OK;
3343                         case NETDEV_DOWN:
3344                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3345                                 return NOTIFY_OK;
3346                         default:
3347                                 return NOTIFY_DONE;
3348                         }
3349                 }
3350
3351                 if (list_empty(&bond->vlan_list))
3352                         continue;
3353
3354                 list_for_each_entry_safe(vlan, vlan_next, &bond->vlan_list,
3355                                          vlan_list) {
3356                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3357                         if (vlan_dev == event_dev) {
3358                                 switch (event) {
3359                                 case NETDEV_UP:
3360                                         vlan->vlan_ip = ifa->ifa_local;
3361                                         return NOTIFY_OK;
3362                                 case NETDEV_DOWN:
3363                                         vlan->vlan_ip =
3364                                                 bond_glean_dev_ip(vlan_dev);
3365                                         return NOTIFY_OK;
3366                                 default:
3367                                         return NOTIFY_DONE;
3368                                 }
3369                         }
3370                 }
3371         }
3372         return NOTIFY_DONE;
3373 }
3374
3375 static struct notifier_block bond_netdev_notifier = {
3376         .notifier_call = bond_netdev_event,
3377 };
3378
3379 static struct notifier_block bond_inetaddr_notifier = {
3380         .notifier_call = bond_inetaddr_event,
3381 };
3382
3383 /*-------------------------- Packet type handling ---------------------------*/
3384
3385 /* register to receive lacpdus on a bond */
3386 static void bond_register_lacpdu(struct bonding *bond)
3387 {
3388         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3389
3390         /* initialize packet type */
3391         pk_type->type = PKT_TYPE_LACPDU;
3392         pk_type->dev = bond->dev;
3393         pk_type->func = bond_3ad_lacpdu_recv;
3394
3395         dev_add_pack(pk_type);
3396 }
3397
3398 /* unregister to receive lacpdus on a bond */
3399 static void bond_unregister_lacpdu(struct bonding *bond)
3400 {
3401         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3402 }
3403
3404 void bond_register_arp(struct bonding *bond)
3405 {
3406         struct packet_type *pt = &bond->arp_mon_pt;
3407
3408         if (pt->type)
3409                 return;
3410
3411         pt->type = htons(ETH_P_ARP);
3412         pt->dev = bond->dev;
3413         pt->func = bond_arp_rcv;
3414         dev_add_pack(pt);
3415 }
3416
3417 void bond_unregister_arp(struct bonding *bond)
3418 {
3419         struct packet_type *pt = &bond->arp_mon_pt;
3420
3421         dev_remove_pack(pt);
3422         pt->type = 0;
3423 }
3424
3425 /*---------------------------- Hashing Policies -----------------------------*/
3426
3427 /*
3428  * Hash for the output device based upon layer 3 and layer 4 data. If
3429  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3430  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3431  */
3432 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3433                                     struct net_device *bond_dev, int count)
3434 {
3435         struct ethhdr *data = (struct ethhdr *)skb->data;
3436         struct iphdr *iph = ip_hdr(skb);
3437         u16 *layer4hdr = (u16 *)((u32 *)iph + iph->ihl);
3438         int layer4_xor = 0;
3439
3440         if (skb->protocol == __constant_htons(ETH_P_IP)) {
3441                 if (!(iph->frag_off & __constant_htons(IP_MF|IP_OFFSET)) &&
3442                     (iph->protocol == IPPROTO_TCP ||
3443                      iph->protocol == IPPROTO_UDP)) {
3444                         layer4_xor = htons((*layer4hdr ^ *(layer4hdr + 1)));
3445                 }
3446                 return (layer4_xor ^
3447                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3448
3449         }
3450
3451         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3452 }
3453
3454 /*
3455  * Hash for the output device based upon layer 2 data
3456  */
3457 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3458                                    struct net_device *bond_dev, int count)
3459 {
3460         struct ethhdr *data = (struct ethhdr *)skb->data;
3461
3462         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3463 }
3464
3465 /*-------------------------- Device entry points ----------------------------*/
3466
3467 static int bond_open(struct net_device *bond_dev)
3468 {
3469         struct bonding *bond = bond_dev->priv;
3470         struct timer_list *mii_timer = &bond->mii_timer;
3471         struct timer_list *arp_timer = &bond->arp_timer;
3472
3473         bond->kill_timers = 0;
3474
3475         if ((bond->params.mode == BOND_MODE_TLB) ||
3476             (bond->params.mode == BOND_MODE_ALB)) {
3477                 struct timer_list *alb_timer = &(BOND_ALB_INFO(bond).alb_timer);
3478
3479                 /* bond_alb_initialize must be called before the timer
3480                  * is started.
3481                  */
3482                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3483                         /* something went wrong - fail the open operation */
3484                         return -1;
3485                 }
3486
3487                 init_timer(alb_timer);
3488                 alb_timer->expires  = jiffies + 1;
3489                 alb_timer->data     = (unsigned long)bond;
3490                 alb_timer->function = (void *)&bond_alb_monitor;
3491                 add_timer(alb_timer);
3492         }
3493
3494         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3495                 init_timer(mii_timer);
3496                 mii_timer->expires  = jiffies + 1;
3497                 mii_timer->data     = (unsigned long)bond_dev;
3498                 mii_timer->function = (void *)&bond_mii_monitor;
3499                 add_timer(mii_timer);
3500         }
3501
3502         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3503                 init_timer(arp_timer);
3504                 arp_timer->expires  = jiffies + 1;
3505                 arp_timer->data     = (unsigned long)bond_dev;
3506                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
3507                         arp_timer->function = (void *)&bond_activebackup_arp_mon;
3508                 } else {
3509                         arp_timer->function = (void *)&bond_loadbalance_arp_mon;
3510                 }
3511                 if (bond->params.arp_validate)
3512                         bond_register_arp(bond);
3513
3514                 add_timer(arp_timer);
3515         }
3516
3517         if (bond->params.mode == BOND_MODE_8023AD) {
3518                 struct timer_list *ad_timer = &(BOND_AD_INFO(bond).ad_timer);
3519                 init_timer(ad_timer);
3520                 ad_timer->expires  = jiffies + 1;
3521                 ad_timer->data     = (unsigned long)bond;
3522                 ad_timer->function = (void *)&bond_3ad_state_machine_handler;
3523                 add_timer(ad_timer);
3524
3525                 /* register to receive LACPDUs */
3526                 bond_register_lacpdu(bond);
3527         }
3528
3529         return 0;
3530 }
3531
3532 static int bond_close(struct net_device *bond_dev)
3533 {
3534         struct bonding *bond = bond_dev->priv;
3535
3536         if (bond->params.mode == BOND_MODE_8023AD) {
3537                 /* Unregister the receive of LACPDUs */
3538                 bond_unregister_lacpdu(bond);
3539         }
3540
3541         if (bond->params.arp_validate)
3542                 bond_unregister_arp(bond);
3543
3544         write_lock_bh(&bond->lock);
3545
3546
3547         /* signal timers not to re-arm */
3548         bond->kill_timers = 1;
3549
3550         write_unlock_bh(&bond->lock);
3551
3552         /* del_timer_sync must run without holding the bond->lock
3553          * because a running timer might be trying to hold it too
3554          */
3555
3556         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3557                 del_timer_sync(&bond->mii_timer);
3558         }
3559
3560         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3561                 del_timer_sync(&bond->arp_timer);
3562         }
3563
3564         switch (bond->params.mode) {
3565         case BOND_MODE_8023AD:
3566                 del_timer_sync(&(BOND_AD_INFO(bond).ad_timer));
3567                 break;
3568         case BOND_MODE_TLB:
3569         case BOND_MODE_ALB:
3570                 del_timer_sync(&(BOND_ALB_INFO(bond).alb_timer));
3571                 break;
3572         default:
3573                 break;
3574         }
3575
3576
3577         if ((bond->params.mode == BOND_MODE_TLB) ||
3578             (bond->params.mode == BOND_MODE_ALB)) {
3579                 /* Must be called only after all
3580                  * slaves have been released
3581                  */
3582                 bond_alb_deinitialize(bond);
3583         }
3584
3585         return 0;
3586 }
3587
3588 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3589 {
3590         struct bonding *bond = bond_dev->priv;
3591         struct net_device_stats *stats = &(bond->stats), *sstats;
3592         struct slave *slave;
3593         int i;
3594
3595         memset(stats, 0, sizeof(struct net_device_stats));
3596
3597         read_lock_bh(&bond->lock);
3598
3599         bond_for_each_slave(bond, slave, i) {
3600                 sstats = slave->dev->get_stats(slave->dev);
3601                 stats->rx_packets += sstats->rx_packets;
3602                 stats->rx_bytes += sstats->rx_bytes;
3603                 stats->rx_errors += sstats->rx_errors;
3604                 stats->rx_dropped += sstats->rx_dropped;
3605
3606                 stats->tx_packets += sstats->tx_packets;
3607                 stats->tx_bytes += sstats->tx_bytes;
3608                 stats->tx_errors += sstats->tx_errors;
3609                 stats->tx_dropped += sstats->tx_dropped;
3610
3611                 stats->multicast += sstats->multicast;
3612                 stats->collisions += sstats->collisions;
3613
3614                 stats->rx_length_errors += sstats->rx_length_errors;
3615                 stats->rx_over_errors += sstats->rx_over_errors;
3616                 stats->rx_crc_errors += sstats->rx_crc_errors;
3617                 stats->rx_frame_errors += sstats->rx_frame_errors;
3618                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3619                 stats->rx_missed_errors += sstats->rx_missed_errors;
3620
3621                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3622                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3623                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3624                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3625                 stats->tx_window_errors += sstats->tx_window_errors;
3626         }
3627
3628         read_unlock_bh(&bond->lock);
3629
3630         return stats;
3631 }
3632
3633 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3634 {
3635         struct net_device *slave_dev = NULL;
3636         struct ifbond k_binfo;
3637         struct ifbond __user *u_binfo = NULL;
3638         struct ifslave k_sinfo;
3639         struct ifslave __user *u_sinfo = NULL;
3640         struct mii_ioctl_data *mii = NULL;
3641         int res = 0;
3642
3643         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3644                 bond_dev->name, cmd);
3645
3646         switch (cmd) {
3647         case SIOCGMIIPHY:
3648                 mii = if_mii(ifr);
3649                 if (!mii) {
3650                         return -EINVAL;
3651                 }
3652                 mii->phy_id = 0;
3653                 /* Fall Through */
3654         case SIOCGMIIREG:
3655                 /*
3656                  * We do this again just in case we were called by SIOCGMIIREG
3657                  * instead of SIOCGMIIPHY.
3658                  */
3659                 mii = if_mii(ifr);
3660                 if (!mii) {
3661                         return -EINVAL;
3662                 }
3663
3664                 if (mii->reg_num == 1) {
3665                         struct bonding *bond = bond_dev->priv;
3666                         mii->val_out = 0;
3667                         read_lock_bh(&bond->lock);
3668                         read_lock(&bond->curr_slave_lock);
3669                         if (netif_carrier_ok(bond->dev)) {
3670                                 mii->val_out = BMSR_LSTATUS;
3671                         }
3672                         read_unlock(&bond->curr_slave_lock);
3673                         read_unlock_bh(&bond->lock);
3674                 }
3675
3676                 return 0;
3677         case BOND_INFO_QUERY_OLD:
3678         case SIOCBONDINFOQUERY:
3679                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3680
3681                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3682                         return -EFAULT;
3683                 }
3684
3685                 res = bond_info_query(bond_dev, &k_binfo);
3686                 if (res == 0) {
3687                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
3688                                 return -EFAULT;
3689                         }
3690                 }
3691
3692                 return res;
3693         case BOND_SLAVE_INFO_QUERY_OLD:
3694         case SIOCBONDSLAVEINFOQUERY:
3695                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3696
3697                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
3698                         return -EFAULT;
3699                 }
3700
3701                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3702                 if (res == 0) {
3703                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
3704                                 return -EFAULT;
3705                         }
3706                 }
3707
3708                 return res;
3709         default:
3710                 /* Go on */
3711                 break;
3712         }
3713
3714         if (!capable(CAP_NET_ADMIN)) {
3715                 return -EPERM;
3716         }
3717
3718         down_write(&(bonding_rwsem));
3719         slave_dev = dev_get_by_name(ifr->ifr_slave);
3720
3721         dprintk("slave_dev=%p: \n", slave_dev);
3722
3723         if (!slave_dev) {
3724                 res = -ENODEV;
3725         } else {
3726                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
3727                 switch (cmd) {
3728                 case BOND_ENSLAVE_OLD:
3729                 case SIOCBONDENSLAVE:
3730                         res = bond_enslave(bond_dev, slave_dev);
3731                         break;
3732                 case BOND_RELEASE_OLD:
3733                 case SIOCBONDRELEASE:
3734                         res = bond_release(bond_dev, slave_dev);
3735                         break;
3736                 case BOND_SETHWADDR_OLD:
3737                 case SIOCBONDSETHWADDR:
3738                         res = bond_sethwaddr(bond_dev, slave_dev);
3739                         break;
3740                 case BOND_CHANGE_ACTIVE_OLD:
3741                 case SIOCBONDCHANGEACTIVE:
3742                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3743                         break;
3744                 default:
3745                         res = -EOPNOTSUPP;
3746                 }
3747
3748                 dev_put(slave_dev);
3749         }
3750
3751         up_write(&(bonding_rwsem));
3752         return res;
3753 }
3754
3755 static void bond_set_multicast_list(struct net_device *bond_dev)
3756 {
3757         struct bonding *bond = bond_dev->priv;
3758         struct dev_mc_list *dmi;
3759
3760         write_lock_bh(&bond->lock);
3761
3762         /*
3763          * Do promisc before checking multicast_mode
3764          */
3765         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
3766                 bond_set_promiscuity(bond, 1);
3767         }
3768
3769         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
3770                 bond_set_promiscuity(bond, -1);
3771         }
3772
3773         /* set allmulti flag to slaves */
3774         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
3775                 bond_set_allmulti(bond, 1);
3776         }
3777
3778         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
3779                 bond_set_allmulti(bond, -1);
3780         }
3781
3782         bond->flags = bond_dev->flags;
3783
3784         /* looking for addresses to add to slaves' mc list */
3785         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
3786                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
3787                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3788                 }
3789         }
3790
3791         /* looking for addresses to delete from slaves' list */
3792         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
3793                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
3794                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
3795                 }
3796         }
3797
3798         /* save master's multicast list */
3799         bond_mc_list_destroy(bond);
3800         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
3801
3802         write_unlock_bh(&bond->lock);
3803 }
3804
3805 /*
3806  * Change the MTU of all of a master's slaves to match the master
3807  */
3808 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3809 {
3810         struct bonding *bond = bond_dev->priv;
3811         struct slave *slave, *stop_at;
3812         int res = 0;
3813         int i;
3814
3815         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
3816                 (bond_dev ? bond_dev->name : "None"), new_mtu);
3817
3818         /* Can't hold bond->lock with bh disabled here since
3819          * some base drivers panic. On the other hand we can't
3820          * hold bond->lock without bh disabled because we'll
3821          * deadlock. The only solution is to rely on the fact
3822          * that we're under rtnl_lock here, and the slaves
3823          * list won't change. This doesn't solve the problem
3824          * of setting the slave's MTU while it is
3825          * transmitting, but the assumption is that the base
3826          * driver can handle that.
3827          *
3828          * TODO: figure out a way to safely iterate the slaves
3829          * list, but without holding a lock around the actual
3830          * call to the base driver.
3831          */
3832
3833         bond_for_each_slave(bond, slave, i) {
3834                 dprintk("s %p s->p %p c_m %p\n", slave,
3835                         slave->prev, slave->dev->change_mtu);
3836
3837                 res = dev_set_mtu(slave->dev, new_mtu);
3838
3839                 if (res) {
3840                         /* If we failed to set the slave's mtu to the new value
3841                          * we must abort the operation even in ACTIVE_BACKUP
3842                          * mode, because if we allow the backup slaves to have
3843                          * different mtu values than the active slave we'll
3844                          * need to change their mtu when doing a failover. That
3845                          * means changing their mtu from timer context, which
3846                          * is probably not a good idea.
3847                          */
3848                         dprintk("err %d %s\n", res, slave->dev->name);
3849                         goto unwind;
3850                 }
3851         }
3852
3853         bond_dev->mtu = new_mtu;
3854
3855         return 0;
3856
3857 unwind:
3858         /* unwind from head to the slave that failed */
3859         stop_at = slave;
3860         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3861                 int tmp_res;
3862
3863                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3864                 if (tmp_res) {
3865                         dprintk("unwind err %d dev %s\n", tmp_res,
3866                                 slave->dev->name);
3867                 }
3868         }
3869
3870         return res;
3871 }
3872
3873 /*
3874  * Change HW address
3875  *
3876  * Note that many devices must be down to change the HW address, and
3877  * downing the master releases all slaves.  We can make bonds full of
3878  * bonding devices to test this, however.
3879  */
3880 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3881 {
3882         struct bonding *bond = bond_dev->priv;
3883         struct sockaddr *sa = addr, tmp_sa;
3884         struct slave *slave, *stop_at;
3885         int res = 0;
3886         int i;
3887
3888         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
3889
3890         if (!is_valid_ether_addr(sa->sa_data)) {
3891                 return -EADDRNOTAVAIL;
3892         }
3893
3894         /* Can't hold bond->lock with bh disabled here since
3895          * some base drivers panic. On the other hand we can't
3896          * hold bond->lock without bh disabled because we'll
3897          * deadlock. The only solution is to rely on the fact
3898          * that we're under rtnl_lock here, and the slaves
3899          * list won't change. This doesn't solve the problem
3900          * of setting the slave's hw address while it is
3901          * transmitting, but the assumption is that the base
3902          * driver can handle that.
3903          *
3904          * TODO: figure out a way to safely iterate the slaves
3905          * list, but without holding a lock around the actual
3906          * call to the base driver.
3907          */
3908
3909         bond_for_each_slave(bond, slave, i) {
3910                 dprintk("slave %p %s\n", slave, slave->dev->name);
3911
3912                 if (slave->dev->set_mac_address == NULL) {
3913                         res = -EOPNOTSUPP;
3914                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
3915                         goto unwind;
3916                 }
3917
3918                 res = dev_set_mac_address(slave->dev, addr);
3919                 if (res) {
3920                         /* TODO: consider downing the slave
3921                          * and retry ?
3922                          * User should expect communications
3923                          * breakage anyway until ARP finish
3924                          * updating, so...
3925                          */
3926                         dprintk("err %d %s\n", res, slave->dev->name);
3927                         goto unwind;
3928                 }
3929         }
3930
3931         /* success */
3932         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3933         return 0;
3934
3935 unwind:
3936         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3937         tmp_sa.sa_family = bond_dev->type;
3938
3939         /* unwind from head to the slave that failed */
3940         stop_at = slave;
3941         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3942                 int tmp_res;
3943
3944                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3945                 if (tmp_res) {
3946                         dprintk("unwind err %d dev %s\n", tmp_res,
3947                                 slave->dev->name);
3948                 }
3949         }
3950
3951         return res;
3952 }
3953
3954 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3955 {
3956         struct bonding *bond = bond_dev->priv;
3957         struct slave *slave, *start_at;
3958         int i;
3959         int res = 1;
3960
3961         read_lock(&bond->lock);
3962
3963         if (!BOND_IS_OK(bond)) {
3964                 goto out;
3965         }
3966
3967         read_lock(&bond->curr_slave_lock);
3968         slave = start_at = bond->curr_active_slave;
3969         read_unlock(&bond->curr_slave_lock);
3970
3971         if (!slave) {
3972                 goto out;
3973         }
3974
3975         bond_for_each_slave_from(bond, slave, i, start_at) {
3976                 if (IS_UP(slave->dev) &&
3977                     (slave->link == BOND_LINK_UP) &&
3978                     (slave->state == BOND_STATE_ACTIVE)) {
3979                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
3980
3981                         write_lock(&bond->curr_slave_lock);
3982                         bond->curr_active_slave = slave->next;
3983                         write_unlock(&bond->curr_slave_lock);
3984
3985                         break;
3986                 }
3987         }
3988
3989
3990 out:
3991         if (res) {
3992                 /* no suitable interface, frame not sent */
3993                 dev_kfree_skb(skb);
3994         }
3995         read_unlock(&bond->lock);
3996         return 0;
3997 }
3998
3999
4000 /*
4001  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4002  * the bond has a usable interface.
4003  */
4004 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4005 {
4006         struct bonding *bond = bond_dev->priv;
4007         int res = 1;
4008
4009         read_lock(&bond->lock);
4010         read_lock(&bond->curr_slave_lock);
4011
4012         if (!BOND_IS_OK(bond)) {
4013                 goto out;
4014         }
4015
4016         if (!bond->curr_active_slave)
4017                 goto out;
4018
4019         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4020
4021 out:
4022         if (res) {
4023                 /* no suitable interface, frame not sent */
4024                 dev_kfree_skb(skb);
4025         }
4026         read_unlock(&bond->curr_slave_lock);
4027         read_unlock(&bond->lock);
4028         return 0;
4029 }
4030
4031 /*
4032  * In bond_xmit_xor() , we determine the output device by using a pre-
4033  * determined xmit_hash_policy(), If the selected device is not enabled,
4034  * find the next active slave.
4035  */
4036 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4037 {
4038         struct bonding *bond = bond_dev->priv;
4039         struct slave *slave, *start_at;
4040         int slave_no;
4041         int i;
4042         int res = 1;
4043
4044         read_lock(&bond->lock);
4045
4046         if (!BOND_IS_OK(bond)) {
4047                 goto out;
4048         }
4049
4050         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4051
4052         bond_for_each_slave(bond, slave, i) {
4053                 slave_no--;
4054                 if (slave_no < 0) {
4055                         break;
4056                 }
4057         }
4058
4059         start_at = slave;
4060
4061         bond_for_each_slave_from(bond, slave, i, start_at) {
4062                 if (IS_UP(slave->dev) &&
4063                     (slave->link == BOND_LINK_UP) &&
4064                     (slave->state == BOND_STATE_ACTIVE)) {
4065                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4066                         break;
4067                 }
4068         }
4069
4070 out:
4071         if (res) {
4072                 /* no suitable interface, frame not sent */
4073                 dev_kfree_skb(skb);
4074         }
4075         read_unlock(&bond->lock);
4076         return 0;
4077 }
4078
4079 /*
4080  * in broadcast mode, we send everything to all usable interfaces.
4081  */
4082 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4083 {
4084         struct bonding *bond = bond_dev->priv;
4085         struct slave *slave, *start_at;
4086         struct net_device *tx_dev = NULL;
4087         int i;
4088         int res = 1;
4089
4090         read_lock(&bond->lock);
4091
4092         if (!BOND_IS_OK(bond)) {
4093                 goto out;
4094         }
4095
4096         read_lock(&bond->curr_slave_lock);
4097         start_at = bond->curr_active_slave;
4098         read_unlock(&bond->curr_slave_lock);
4099
4100         if (!start_at) {
4101                 goto out;
4102         }
4103
4104         bond_for_each_slave_from(bond, slave, i, start_at) {
4105                 if (IS_UP(slave->dev) &&
4106                     (slave->link == BOND_LINK_UP) &&
4107                     (slave->state == BOND_STATE_ACTIVE)) {
4108                         if (tx_dev) {
4109                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4110                                 if (!skb2) {
4111                                         printk(KERN_ERR DRV_NAME
4112                                                ": %s: Error: bond_xmit_broadcast(): "
4113                                                "skb_clone() failed\n",
4114                                                bond_dev->name);
4115                                         continue;
4116                                 }
4117
4118                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4119                                 if (res) {
4120                                         dev_kfree_skb(skb2);
4121                                         continue;
4122                                 }
4123                         }
4124                         tx_dev = slave->dev;
4125                 }
4126         }
4127
4128         if (tx_dev) {
4129                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4130         }
4131
4132 out:
4133         if (res) {
4134                 /* no suitable interface, frame not sent */
4135                 dev_kfree_skb(skb);
4136         }
4137         /* frame sent to all suitable interfaces */
4138         read_unlock(&bond->lock);
4139         return 0;
4140 }
4141
4142 /*------------------------- Device initialization ---------------------------*/
4143
4144 /*
4145  * set bond mode specific net device operations
4146  */
4147 void bond_set_mode_ops(struct bonding *bond, int mode)
4148 {
4149         struct net_device *bond_dev = bond->dev;
4150
4151         switch (mode) {
4152         case BOND_MODE_ROUNDROBIN:
4153                 bond_dev->hard_start_xmit = bond_xmit_roundrobin;
4154                 break;
4155         case BOND_MODE_ACTIVEBACKUP:
4156                 bond_dev->hard_start_xmit = bond_xmit_activebackup;
4157                 break;
4158         case BOND_MODE_XOR:
4159                 bond_dev->hard_start_xmit = bond_xmit_xor;
4160                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4161                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4162                 else
4163                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4164                 break;
4165         case BOND_MODE_BROADCAST:
4166                 bond_dev->hard_start_xmit = bond_xmit_broadcast;
4167                 break;
4168         case BOND_MODE_8023AD:
4169                 bond_set_master_3ad_flags(bond);
4170                 bond_dev->hard_start_xmit = bond_3ad_xmit_xor;
4171                 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
4172                         bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4173                 else
4174                         bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4175                 break;
4176         case BOND_MODE_ALB:
4177                 bond_set_master_alb_flags(bond);
4178                 /* FALLTHRU */
4179         case BOND_MODE_TLB:
4180                 bond_dev->hard_start_xmit = bond_alb_xmit;
4181                 bond_dev->set_mac_address = bond_alb_set_mac_address;
4182                 break;
4183         default:
4184                 /* Should never happen, mode already checked */
4185                 printk(KERN_ERR DRV_NAME
4186                        ": %s: Error: Unknown bonding mode %d\n",
4187                        bond_dev->name,
4188                        mode);
4189                 break;
4190         }
4191 }
4192
4193 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4194                                     struct ethtool_drvinfo *drvinfo)
4195 {
4196         strncpy(drvinfo->driver, DRV_NAME, 32);
4197         strncpy(drvinfo->version, DRV_VERSION, 32);
4198         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4199 }
4200
4201 static const struct ethtool_ops bond_ethtool_ops = {
4202         .get_tx_csum            = ethtool_op_get_tx_csum,
4203         .get_tso                = ethtool_op_get_tso,
4204         .get_ufo                = ethtool_op_get_ufo,
4205         .get_sg                 = ethtool_op_get_sg,
4206         .get_drvinfo            = bond_ethtool_get_drvinfo,
4207 };
4208
4209 /*
4210  * Does not allocate but creates a /proc entry.
4211  * Allowed to fail.
4212  */
4213 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4214 {
4215         struct bonding *bond = bond_dev->priv;
4216
4217         dprintk("Begin bond_init for %s\n", bond_dev->name);
4218
4219         /* initialize rwlocks */
4220         rwlock_init(&bond->lock);
4221         rwlock_init(&bond->curr_slave_lock);
4222
4223         bond->params = *params; /* copy params struct */
4224
4225         /* Initialize pointers */
4226         bond->first_slave = NULL;
4227         bond->curr_active_slave = NULL;
4228         bond->current_arp_slave = NULL;
4229         bond->primary_slave = NULL;
4230         bond->dev = bond_dev;
4231         INIT_LIST_HEAD(&bond->vlan_list);
4232
4233         /* Initialize the device entry points */
4234         bond_dev->open = bond_open;
4235         bond_dev->stop = bond_close;
4236         bond_dev->get_stats = bond_get_stats;
4237         bond_dev->do_ioctl = bond_do_ioctl;
4238         bond_dev->ethtool_ops = &bond_ethtool_ops;
4239         bond_dev->set_multicast_list = bond_set_multicast_list;
4240         bond_dev->change_mtu = bond_change_mtu;
4241         bond_dev->set_mac_address = bond_set_mac_address;
4242
4243         bond_set_mode_ops(bond, bond->params.mode);
4244
4245         bond_dev->destructor = free_netdev;
4246
4247         /* Initialize the device options */
4248         bond_dev->tx_queue_len = 0;
4249         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4250         bond_dev->priv_flags |= IFF_BONDING;
4251
4252         /* At first, we block adding VLANs. That's the only way to
4253          * prevent problems that occur when adding VLANs over an
4254          * empty bond. The block will be removed once non-challenged
4255          * slaves are enslaved.
4256          */
4257         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4258
4259         /* don't acquire bond device's netif_tx_lock when
4260          * transmitting */
4261         bond_dev->features |= NETIF_F_LLTX;
4262
4263         /* By default, we declare the bond to be fully
4264          * VLAN hardware accelerated capable. Special
4265          * care is taken in the various xmit functions
4266          * when there are slaves that are not hw accel
4267          * capable
4268          */
4269         bond_dev->vlan_rx_register = bond_vlan_rx_register;
4270         bond_dev->vlan_rx_add_vid  = bond_vlan_rx_add_vid;
4271         bond_dev->vlan_rx_kill_vid = bond_vlan_rx_kill_vid;
4272         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4273                                NETIF_F_HW_VLAN_RX |
4274                                NETIF_F_HW_VLAN_FILTER);
4275
4276 #ifdef CONFIG_PROC_FS
4277         bond_create_proc_entry(bond);
4278 #endif
4279
4280         list_add_tail(&bond->bond_list, &bond_dev_list);
4281
4282         return 0;
4283 }
4284
4285 /* De-initialize device specific data.
4286  * Caller must hold rtnl_lock.
4287  */
4288 void bond_deinit(struct net_device *bond_dev)
4289 {
4290         struct bonding *bond = bond_dev->priv;
4291
4292         list_del(&bond->bond_list);
4293
4294 #ifdef CONFIG_PROC_FS
4295         bond_remove_proc_entry(bond);
4296 #endif
4297 }
4298
4299 /* Unregister and free all bond devices.
4300  * Caller must hold rtnl_lock.
4301  */
4302 static void bond_free_all(void)
4303 {
4304         struct bonding *bond, *nxt;
4305
4306         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4307                 struct net_device *bond_dev = bond->dev;
4308
4309                 bond_mc_list_destroy(bond);
4310                 /* Release the bonded slaves */
4311                 bond_release_all(bond_dev);
4312                 bond_deinit(bond_dev);
4313                 unregister_netdevice(bond_dev);
4314         }
4315
4316 #ifdef CONFIG_PROC_FS
4317         bond_destroy_proc_dir();
4318 #endif
4319 }
4320
4321 /*------------------------- Module initialization ---------------------------*/
4322
4323 /*
4324  * Convert string input module parms.  Accept either the
4325  * number of the mode or its string name.
4326  */
4327 int bond_parse_parm(char *mode_arg, struct bond_parm_tbl *tbl)
4328 {
4329         int i;
4330
4331         for (i = 0; tbl[i].modename; i++) {
4332                 if ((isdigit(*mode_arg) &&
4333                      tbl[i].mode == simple_strtol(mode_arg, NULL, 0)) ||
4334                     (strncmp(mode_arg, tbl[i].modename,
4335                              strlen(tbl[i].modename)) == 0)) {
4336                         return tbl[i].mode;
4337                 }
4338         }
4339
4340         return -1;
4341 }
4342
4343 static int bond_check_params(struct bond_params *params)
4344 {
4345         int arp_validate_value;
4346
4347         /*
4348          * Convert string parameters.
4349          */
4350         if (mode) {
4351                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4352                 if (bond_mode == -1) {
4353                         printk(KERN_ERR DRV_NAME
4354                                ": Error: Invalid bonding mode \"%s\"\n",
4355                                mode == NULL ? "NULL" : mode);
4356                         return -EINVAL;
4357                 }
4358         }
4359
4360         if (xmit_hash_policy) {
4361                 if ((bond_mode != BOND_MODE_XOR) &&
4362                     (bond_mode != BOND_MODE_8023AD)) {
4363                         printk(KERN_INFO DRV_NAME
4364                                ": xor_mode param is irrelevant in mode %s\n",
4365                                bond_mode_name(bond_mode));
4366                 } else {
4367                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4368                                                         xmit_hashtype_tbl);
4369                         if (xmit_hashtype == -1) {
4370                                 printk(KERN_ERR DRV_NAME
4371                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4372                                 xmit_hash_policy == NULL ? "NULL" :
4373                                        xmit_hash_policy);
4374                                 return -EINVAL;
4375                         }
4376                 }
4377         }
4378
4379         if (lacp_rate) {
4380                 if (bond_mode != BOND_MODE_8023AD) {
4381                         printk(KERN_INFO DRV_NAME
4382                                ": lacp_rate param is irrelevant in mode %s\n",
4383                                bond_mode_name(bond_mode));
4384                 } else {
4385                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4386                         if (lacp_fast == -1) {
4387                                 printk(KERN_ERR DRV_NAME
4388                                        ": Error: Invalid lacp rate \"%s\"\n",
4389                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4390                                 return -EINVAL;
4391                         }
4392                 }
4393         }
4394
4395         if (max_bonds < 1 || max_bonds > INT_MAX) {
4396                 printk(KERN_WARNING DRV_NAME
4397                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4398                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4399                        max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4400                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4401         }
4402
4403         if (miimon < 0) {
4404                 printk(KERN_WARNING DRV_NAME
4405                        ": Warning: miimon module parameter (%d), "
4406                        "not in range 0-%d, so it was reset to %d\n",
4407                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4408                 miimon = BOND_LINK_MON_INTERV;
4409         }
4410
4411         if (updelay < 0) {
4412                 printk(KERN_WARNING DRV_NAME
4413                        ": Warning: updelay module parameter (%d), "
4414                        "not in range 0-%d, so it was reset to 0\n",
4415                        updelay, INT_MAX);
4416                 updelay = 0;
4417         }
4418
4419         if (downdelay < 0) {
4420                 printk(KERN_WARNING DRV_NAME
4421                        ": Warning: downdelay module parameter (%d), "
4422                        "not in range 0-%d, so it was reset to 0\n",
4423                        downdelay, INT_MAX);
4424                 downdelay = 0;
4425         }
4426
4427         if ((use_carrier != 0) && (use_carrier != 1)) {
4428                 printk(KERN_WARNING DRV_NAME
4429                        ": Warning: use_carrier module parameter (%d), "
4430                        "not of valid value (0/1), so it was set to 1\n",
4431                        use_carrier);
4432                 use_carrier = 1;
4433         }
4434
4435         /* reset values for 802.3ad */
4436         if (bond_mode == BOND_MODE_8023AD) {
4437                 if (!miimon) {
4438                         printk(KERN_WARNING DRV_NAME
4439                                ": Warning: miimon must be specified, "
4440                                "otherwise bonding will not detect link "
4441                                "failure, speed and duplex which are "
4442                                "essential for 802.3ad operation\n");
4443                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4444                         miimon = 100;
4445                 }
4446         }
4447
4448         /* reset values for TLB/ALB */
4449         if ((bond_mode == BOND_MODE_TLB) ||
4450             (bond_mode == BOND_MODE_ALB)) {
4451                 if (!miimon) {
4452                         printk(KERN_WARNING DRV_NAME
4453                                ": Warning: miimon must be specified, "
4454                                "otherwise bonding will not detect link "
4455                                "failure and link speed which are essential "
4456                                "for TLB/ALB load balancing\n");
4457                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4458                         miimon = 100;
4459                 }
4460         }
4461
4462         if (bond_mode == BOND_MODE_ALB) {
4463                 printk(KERN_NOTICE DRV_NAME
4464                        ": In ALB mode you might experience client "
4465                        "disconnections upon reconnection of a link if the "
4466                        "bonding module updelay parameter (%d msec) is "
4467                        "incompatible with the forwarding delay time of the "
4468                        "switch\n",
4469                        updelay);
4470         }
4471
4472         if (!miimon) {
4473                 if (updelay || downdelay) {
4474                         /* just warn the user the up/down delay will have
4475                          * no effect since miimon is zero...
4476                          */
4477                         printk(KERN_WARNING DRV_NAME
4478                                ": Warning: miimon module parameter not set "
4479                                "and updelay (%d) or downdelay (%d) module "
4480                                "parameter is set; updelay and downdelay have "
4481                                "no effect unless miimon is set\n",
4482                                updelay, downdelay);
4483                 }
4484         } else {
4485                 /* don't allow arp monitoring */
4486                 if (arp_interval) {
4487                         printk(KERN_WARNING DRV_NAME
4488                                ": Warning: miimon (%d) and arp_interval (%d) "
4489                                "can't be used simultaneously, disabling ARP "
4490                                "monitoring\n",
4491                                miimon, arp_interval);
4492                         arp_interval = 0;
4493                 }
4494
4495                 if ((updelay % miimon) != 0) {
4496                         printk(KERN_WARNING DRV_NAME
4497                                ": Warning: updelay (%d) is not a multiple "
4498                                "of miimon (%d), updelay rounded to %d ms\n",
4499                                updelay, miimon, (updelay / miimon) * miimon);
4500                 }
4501
4502                 updelay /= miimon;
4503
4504                 if ((downdelay % miimon) != 0) {
4505                         printk(KERN_WARNING DRV_NAME
4506                                ": Warning: downdelay (%d) is not a multiple "
4507                                "of miimon (%d), downdelay rounded to %d ms\n",
4508                                downdelay, miimon,
4509                                (downdelay / miimon) * miimon);
4510                 }
4511
4512                 downdelay /= miimon;
4513         }
4514
4515         if (arp_interval < 0) {
4516                 printk(KERN_WARNING DRV_NAME
4517                        ": Warning: arp_interval module parameter (%d) "
4518                        ", not in range 0-%d, so it was reset to %d\n",
4519                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4520                 arp_interval = BOND_LINK_ARP_INTERV;
4521         }
4522
4523         for (arp_ip_count = 0;
4524              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4525              arp_ip_count++) {
4526                 /* not complete check, but should be good enough to
4527                    catch mistakes */
4528                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4529                         printk(KERN_WARNING DRV_NAME
4530                                ": Warning: bad arp_ip_target module parameter "
4531                                "(%s), ARP monitoring will not be performed\n",
4532                                arp_ip_target[arp_ip_count]);
4533                         arp_interval = 0;
4534                 } else {
4535                         u32 ip = in_aton(arp_ip_target[arp_ip_count]);
4536                         arp_target[arp_ip_count] = ip;
4537                 }
4538         }
4539
4540         if (arp_interval && !arp_ip_count) {
4541                 /* don't allow arping if no arp_ip_target given... */
4542                 printk(KERN_WARNING DRV_NAME
4543                        ": Warning: arp_interval module parameter (%d) "
4544                        "specified without providing an arp_ip_target "
4545                        "parameter, arp_interval was reset to 0\n",
4546                        arp_interval);
4547                 arp_interval = 0;
4548         }
4549
4550         if (arp_validate) {
4551                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4552                         printk(KERN_ERR DRV_NAME
4553                ": arp_validate only supported in active-backup mode\n");
4554                         return -EINVAL;
4555                 }
4556                 if (!arp_interval) {
4557                         printk(KERN_ERR DRV_NAME
4558                                ": arp_validate requires arp_interval\n");
4559                         return -EINVAL;
4560                 }
4561
4562                 arp_validate_value = bond_parse_parm(arp_validate,
4563                                                      arp_validate_tbl);
4564                 if (arp_validate_value == -1) {
4565                         printk(KERN_ERR DRV_NAME
4566                                ": Error: invalid arp_validate \"%s\"\n",
4567                                arp_validate == NULL ? "NULL" : arp_validate);
4568                         return -EINVAL;
4569                 }
4570         } else
4571                 arp_validate_value = 0;
4572
4573         if (miimon) {
4574                 printk(KERN_INFO DRV_NAME
4575                        ": MII link monitoring set to %d ms\n",
4576                        miimon);
4577         } else if (arp_interval) {
4578                 int i;
4579
4580                 printk(KERN_INFO DRV_NAME
4581                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
4582                        arp_interval,
4583                        arp_validate_tbl[arp_validate_value].modename,
4584                        arp_ip_count);
4585
4586                 for (i = 0; i < arp_ip_count; i++)
4587                         printk (" %s", arp_ip_target[i]);
4588
4589                 printk("\n");
4590
4591         } else {
4592                 /* miimon and arp_interval not set, we need one so things
4593                  * work as expected, see bonding.txt for details
4594                  */
4595                 printk(KERN_WARNING DRV_NAME
4596                        ": Warning: either miimon or arp_interval and "
4597                        "arp_ip_target module parameters must be specified, "
4598                        "otherwise bonding will not detect link failures! see "
4599                        "bonding.txt for details.\n");
4600         }
4601
4602         if (primary && !USES_PRIMARY(bond_mode)) {
4603                 /* currently, using a primary only makes sense
4604                  * in active backup, TLB or ALB modes
4605                  */
4606                 printk(KERN_WARNING DRV_NAME
4607                        ": Warning: %s primary device specified but has no "
4608                        "effect in %s mode\n",
4609                        primary, bond_mode_name(bond_mode));
4610                 primary = NULL;
4611         }
4612
4613         /* fill params struct with the proper values */
4614         params->mode = bond_mode;
4615         params->xmit_policy = xmit_hashtype;
4616         params->miimon = miimon;
4617         params->arp_interval = arp_interval;
4618         params->arp_validate = arp_validate_value;
4619         params->updelay = updelay;
4620         params->downdelay = downdelay;
4621         params->use_carrier = use_carrier;
4622         params->lacp_fast = lacp_fast;
4623         params->primary[0] = 0;
4624
4625         if (primary) {
4626                 strncpy(params->primary, primary, IFNAMSIZ);
4627                 params->primary[IFNAMSIZ - 1] = 0;
4628         }
4629
4630         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4631
4632         return 0;
4633 }
4634
4635 static struct lock_class_key bonding_netdev_xmit_lock_key;
4636
4637 /* Create a new bond based on the specified name and bonding parameters.
4638  * If name is NULL, obtain a suitable "bond%d" name for us.
4639  * Caller must NOT hold rtnl_lock; we need to release it here before we
4640  * set up our sysfs entries.
4641  */
4642 int bond_create(char *name, struct bond_params *params, struct bonding **newbond)
4643 {
4644         struct net_device *bond_dev;
4645         int res;
4646
4647         rtnl_lock();
4648         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
4649                                 ether_setup);
4650         if (!bond_dev) {
4651                 printk(KERN_ERR DRV_NAME
4652                        ": %s: eek! can't alloc netdev!\n",
4653                        name);
4654                 res = -ENOMEM;
4655                 goto out_rtnl;
4656         }
4657
4658         if (!name) {
4659                 res = dev_alloc_name(bond_dev, "bond%d");
4660                 if (res < 0)
4661                         goto out_netdev;
4662         }
4663
4664         /* bond_init() must be called after dev_alloc_name() (for the
4665          * /proc files), but before register_netdevice(), because we
4666          * need to set function pointers.
4667          */
4668
4669         res = bond_init(bond_dev, params);
4670         if (res < 0) {
4671                 goto out_netdev;
4672         }
4673
4674         SET_MODULE_OWNER(bond_dev);
4675
4676         res = register_netdevice(bond_dev);
4677         if (res < 0) {
4678                 goto out_bond;
4679         }
4680
4681         lockdep_set_class(&bond_dev->_xmit_lock, &bonding_netdev_xmit_lock_key);
4682
4683         if (newbond)
4684                 *newbond = bond_dev->priv;
4685
4686         netif_carrier_off(bond_dev);
4687
4688         rtnl_unlock(); /* allows sysfs registration of net device */
4689         res = bond_create_sysfs_entry(bond_dev->priv);
4690         if (res < 0) {
4691                 rtnl_lock();
4692                 goto out_bond;
4693         }
4694
4695         return 0;
4696
4697 out_bond:
4698         bond_deinit(bond_dev);
4699 out_netdev:
4700         free_netdev(bond_dev);
4701 out_rtnl:
4702         rtnl_unlock();
4703         return res;
4704 }
4705
4706 static int __init bonding_init(void)
4707 {
4708         int i;
4709         int res;
4710
4711         printk(KERN_INFO "%s", version);
4712
4713         res = bond_check_params(&bonding_defaults);
4714         if (res) {
4715                 goto out;
4716         }
4717
4718 #ifdef CONFIG_PROC_FS
4719         bond_create_proc_dir();
4720 #endif
4721         for (i = 0; i < max_bonds; i++) {
4722                 res = bond_create(NULL, &bonding_defaults, NULL);
4723                 if (res)
4724                         goto err;
4725         }
4726
4727         res = bond_create_sysfs();
4728         if (res)
4729                 goto err;
4730
4731         register_netdevice_notifier(&bond_netdev_notifier);
4732         register_inetaddr_notifier(&bond_inetaddr_notifier);
4733
4734         goto out;
4735 err:
4736         rtnl_lock();
4737         bond_free_all();
4738         bond_destroy_sysfs();
4739         rtnl_unlock();
4740 out:
4741         return res;
4742
4743 }
4744
4745 static void __exit bonding_exit(void)
4746 {
4747         unregister_netdevice_notifier(&bond_netdev_notifier);
4748         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4749
4750         rtnl_lock();
4751         bond_free_all();
4752         bond_destroy_sysfs();
4753         rtnl_unlock();
4754 }
4755
4756 module_init(bonding_init);
4757 module_exit(bonding_exit);
4758 MODULE_LICENSE("GPL");
4759 MODULE_VERSION(DRV_VERSION);
4760 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4761 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4762 MODULE_SUPPORTED_DEVICE("most ethernet devices");
4763
4764 /*
4765  * Local variables:
4766  *  c-indent-level: 8
4767  *  c-basic-offset: 8
4768  *  tab-width: 8
4769  * End:
4770  */
4771