netdev: add more functions to netdevice ops
[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 <linux/jiffies.h>
78 #include <net/route.h>
79 #include <net/net_namespace.h>
80 #include "bonding.h"
81 #include "bond_3ad.h"
82 #include "bond_alb.h"
83
84 /*---------------------------- Module parameters ----------------------------*/
85
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV    0
88 #define BOND_LINK_ARP_INTERV    0
89
90 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
91 static int num_grat_arp = 1;
92 static int num_unsol_na = 1;
93 static int miimon       = BOND_LINK_MON_INTERV;
94 static int updelay      = 0;
95 static int downdelay    = 0;
96 static int use_carrier  = 1;
97 static char *mode       = NULL;
98 static char *primary    = NULL;
99 static char *lacp_rate  = NULL;
100 static char *ad_select  = NULL;
101 static char *xmit_hash_policy = NULL;
102 static int arp_interval = BOND_LINK_ARP_INTERV;
103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
104 static char *arp_validate = NULL;
105 static char *fail_over_mac = NULL;
106 struct bond_params bonding_defaults;
107
108 module_param(max_bonds, int, 0);
109 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
110 module_param(num_grat_arp, int, 0644);
111 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
112 module_param(num_unsol_na, int, 0644);
113 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
114 module_param(miimon, int, 0);
115 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
116 module_param(updelay, int, 0);
117 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
118 module_param(downdelay, int, 0);
119 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
120                             "in milliseconds");
121 module_param(use_carrier, int, 0);
122 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
123                               "0 for off, 1 for on (default)");
124 module_param(mode, charp, 0);
125 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
126                        "1 for active-backup, 2 for balance-xor, "
127                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
128                        "6 for balance-alb");
129 module_param(primary, charp, 0);
130 MODULE_PARM_DESC(primary, "Primary network device to use");
131 module_param(lacp_rate, charp, 0);
132 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
133                             "(slow/fast)");
134 module_param(ad_select, charp, 0);
135 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
136 module_param(xmit_hash_policy, charp, 0);
137 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
138                                    ", 1 for layer 3+4");
139 module_param(arp_interval, int, 0);
140 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
141 module_param_array(arp_ip_target, charp, NULL, 0);
142 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
143 module_param(arp_validate, charp, 0);
144 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
145 module_param(fail_over_mac, charp, 0);
146 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
147
148 /*----------------------------- Global variables ----------------------------*/
149
150 static const char * const version =
151         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
152
153 LIST_HEAD(bond_dev_list);
154
155 #ifdef CONFIG_PROC_FS
156 static struct proc_dir_entry *bond_proc_dir = NULL;
157 #endif
158
159 extern struct rw_semaphore bonding_rwsem;
160 static __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0, } ;
161 static int arp_ip_count = 0;
162 static int bond_mode    = BOND_MODE_ROUNDROBIN;
163 static int xmit_hashtype= BOND_XMIT_POLICY_LAYER2;
164 static int lacp_fast    = 0;
165
166
167 struct bond_parm_tbl bond_lacp_tbl[] = {
168 {       "slow",         AD_LACP_SLOW},
169 {       "fast",         AD_LACP_FAST},
170 {       NULL,           -1},
171 };
172
173 struct bond_parm_tbl bond_mode_tbl[] = {
174 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
175 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
176 {       "balance-xor",          BOND_MODE_XOR},
177 {       "broadcast",            BOND_MODE_BROADCAST},
178 {       "802.3ad",              BOND_MODE_8023AD},
179 {       "balance-tlb",          BOND_MODE_TLB},
180 {       "balance-alb",          BOND_MODE_ALB},
181 {       NULL,                   -1},
182 };
183
184 struct bond_parm_tbl xmit_hashtype_tbl[] = {
185 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
186 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
187 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
188 {       NULL,                   -1},
189 };
190
191 struct bond_parm_tbl arp_validate_tbl[] = {
192 {       "none",                 BOND_ARP_VALIDATE_NONE},
193 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
194 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
195 {       "all",                  BOND_ARP_VALIDATE_ALL},
196 {       NULL,                   -1},
197 };
198
199 struct bond_parm_tbl fail_over_mac_tbl[] = {
200 {       "none",                 BOND_FOM_NONE},
201 {       "active",               BOND_FOM_ACTIVE},
202 {       "follow",               BOND_FOM_FOLLOW},
203 {       NULL,                   -1},
204 };
205
206 struct bond_parm_tbl ad_select_tbl[] = {
207 {       "stable",       BOND_AD_STABLE},
208 {       "bandwidth",    BOND_AD_BANDWIDTH},
209 {       "count",        BOND_AD_COUNT},
210 {       NULL,           -1},
211 };
212
213 /*-------------------------- Forward declarations ---------------------------*/
214
215 static void bond_send_gratuitous_arp(struct bonding *bond);
216 static void bond_deinit(struct net_device *bond_dev);
217
218 /*---------------------------- General routines -----------------------------*/
219
220 static const char *bond_mode_name(int mode)
221 {
222         switch (mode) {
223         case BOND_MODE_ROUNDROBIN :
224                 return "load balancing (round-robin)";
225         case BOND_MODE_ACTIVEBACKUP :
226                 return "fault-tolerance (active-backup)";
227         case BOND_MODE_XOR :
228                 return "load balancing (xor)";
229         case BOND_MODE_BROADCAST :
230                 return "fault-tolerance (broadcast)";
231         case BOND_MODE_8023AD:
232                 return "IEEE 802.3ad Dynamic link aggregation";
233         case BOND_MODE_TLB:
234                 return "transmit load balancing";
235         case BOND_MODE_ALB:
236                 return "adaptive load balancing";
237         default:
238                 return "unknown";
239         }
240 }
241
242 /*---------------------------------- VLAN -----------------------------------*/
243
244 /**
245  * bond_add_vlan - add a new vlan id on bond
246  * @bond: bond that got the notification
247  * @vlan_id: the vlan id to add
248  *
249  * Returns -ENOMEM if allocation failed.
250  */
251 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
252 {
253         struct vlan_entry *vlan;
254
255         dprintk("bond: %s, vlan id %d\n",
256                 (bond ? bond->dev->name: "None"), vlan_id);
257
258         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
259         if (!vlan) {
260                 return -ENOMEM;
261         }
262
263         INIT_LIST_HEAD(&vlan->vlan_list);
264         vlan->vlan_id = vlan_id;
265
266         write_lock_bh(&bond->lock);
267
268         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
269
270         write_unlock_bh(&bond->lock);
271
272         dprintk("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
273
274         return 0;
275 }
276
277 /**
278  * bond_del_vlan - delete a vlan id from bond
279  * @bond: bond that got the notification
280  * @vlan_id: the vlan id to delete
281  *
282  * returns -ENODEV if @vlan_id was not found in @bond.
283  */
284 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
285 {
286         struct vlan_entry *vlan;
287         int res = -ENODEV;
288
289         dprintk("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
290
291         write_lock_bh(&bond->lock);
292
293         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
294                 if (vlan->vlan_id == vlan_id) {
295                         list_del(&vlan->vlan_list);
296
297                         if ((bond->params.mode == BOND_MODE_TLB) ||
298                             (bond->params.mode == BOND_MODE_ALB)) {
299                                 bond_alb_clear_vlan(bond, vlan_id);
300                         }
301
302                         dprintk("removed VLAN ID %d from bond %s\n", vlan_id,
303                                 bond->dev->name);
304
305                         kfree(vlan);
306
307                         if (list_empty(&bond->vlan_list) &&
308                             (bond->slave_cnt == 0)) {
309                                 /* Last VLAN removed and no slaves, so
310                                  * restore block on adding VLANs. This will
311                                  * be removed once new slaves that are not
312                                  * VLAN challenged will be added.
313                                  */
314                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
315                         }
316
317                         res = 0;
318                         goto out;
319                 }
320         }
321
322         dprintk("couldn't find VLAN ID %d in bond %s\n", vlan_id,
323                 bond->dev->name);
324
325 out:
326         write_unlock_bh(&bond->lock);
327         return res;
328 }
329
330 /**
331  * bond_has_challenged_slaves
332  * @bond: the bond we're working on
333  *
334  * Searches the slave list. Returns 1 if a vlan challenged slave
335  * was found, 0 otherwise.
336  *
337  * Assumes bond->lock is held.
338  */
339 static int bond_has_challenged_slaves(struct bonding *bond)
340 {
341         struct slave *slave;
342         int i;
343
344         bond_for_each_slave(bond, slave, i) {
345                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
346                         dprintk("found VLAN challenged slave - %s\n",
347                                 slave->dev->name);
348                         return 1;
349                 }
350         }
351
352         dprintk("no VLAN challenged slaves found\n");
353         return 0;
354 }
355
356 /**
357  * bond_next_vlan - safely skip to the next item in the vlans list.
358  * @bond: the bond we're working on
359  * @curr: item we're advancing from
360  *
361  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
362  * or @curr->next otherwise (even if it is @curr itself again).
363  * 
364  * Caller must hold bond->lock
365  */
366 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
367 {
368         struct vlan_entry *next, *last;
369
370         if (list_empty(&bond->vlan_list)) {
371                 return NULL;
372         }
373
374         if (!curr) {
375                 next = list_entry(bond->vlan_list.next,
376                                   struct vlan_entry, vlan_list);
377         } else {
378                 last = list_entry(bond->vlan_list.prev,
379                                   struct vlan_entry, vlan_list);
380                 if (last == curr) {
381                         next = list_entry(bond->vlan_list.next,
382                                           struct vlan_entry, vlan_list);
383                 } else {
384                         next = list_entry(curr->vlan_list.next,
385                                           struct vlan_entry, vlan_list);
386                 }
387         }
388
389         return next;
390 }
391
392 /**
393  * bond_dev_queue_xmit - Prepare skb for xmit.
394  * 
395  * @bond: bond device that got this skb for tx.
396  * @skb: hw accel VLAN tagged skb to transmit
397  * @slave_dev: slave that is supposed to xmit this skbuff
398  * 
399  * When the bond gets an skb to transmit that is
400  * already hardware accelerated VLAN tagged, and it
401  * needs to relay this skb to a slave that is not
402  * hw accel capable, the skb needs to be "unaccelerated",
403  * i.e. strip the hwaccel tag and re-insert it as part
404  * of the payload.
405  */
406 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev)
407 {
408         unsigned short uninitialized_var(vlan_id);
409
410         if (!list_empty(&bond->vlan_list) &&
411             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
412             vlan_get_tag(skb, &vlan_id) == 0) {
413                 skb->dev = slave_dev;
414                 skb = vlan_put_tag(skb, vlan_id);
415                 if (!skb) {
416                         /* vlan_put_tag() frees the skb in case of error,
417                          * so return success here so the calling functions
418                          * won't attempt to free is again.
419                          */
420                         return 0;
421                 }
422         } else {
423                 skb->dev = slave_dev;
424         }
425
426         skb->priority = 1;
427         dev_queue_xmit(skb);
428
429         return 0;
430 }
431
432 /*
433  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
434  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
435  * lock because:
436  * a. This operation is performed in IOCTL context,
437  * b. The operation is protected by the RTNL semaphore in the 8021q code,
438  * c. Holding a lock with BH disabled while directly calling a base driver
439  *    entry point is generally a BAD idea.
440  * 
441  * The design of synchronization/protection for this operation in the 8021q
442  * module is good for one or more VLAN devices over a single physical device
443  * and cannot be extended for a teaming solution like bonding, so there is a
444  * potential race condition here where a net device from the vlan group might
445  * be referenced (either by a base driver or the 8021q code) while it is being
446  * removed from the system. However, it turns out we're not making matters
447  * worse, and if it works for regular VLAN usage it will work here too.
448 */
449
450 /**
451  * bond_vlan_rx_register - Propagates registration to slaves
452  * @bond_dev: bonding net device that got called
453  * @grp: vlan group being registered
454  */
455 static void bond_vlan_rx_register(struct net_device *bond_dev, struct vlan_group *grp)
456 {
457         struct bonding *bond = netdev_priv(bond_dev);
458         struct slave *slave;
459         int i;
460
461         bond->vlgrp = grp;
462
463         bond_for_each_slave(bond, slave, i) {
464                 struct net_device *slave_dev = slave->dev;
465                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
466
467                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
468                     slave_ops->ndo_vlan_rx_register) {
469                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
470                 }
471         }
472 }
473
474 /**
475  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
476  * @bond_dev: bonding net device that got called
477  * @vid: vlan id being added
478  */
479 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
480 {
481         struct bonding *bond = netdev_priv(bond_dev);
482         struct slave *slave;
483         int i, res;
484
485         bond_for_each_slave(bond, slave, i) {
486                 struct net_device *slave_dev = slave->dev;
487                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
488
489                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
490                     slave_ops->ndo_vlan_rx_add_vid) {
491                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
492                 }
493         }
494
495         res = bond_add_vlan(bond, vid);
496         if (res) {
497                 printk(KERN_ERR DRV_NAME
498                        ": %s: Error: Failed to add vlan id %d\n",
499                        bond_dev->name, vid);
500         }
501 }
502
503 /**
504  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
505  * @bond_dev: bonding net device that got called
506  * @vid: vlan id being removed
507  */
508 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
509 {
510         struct bonding *bond = netdev_priv(bond_dev);
511         struct slave *slave;
512         struct net_device *vlan_dev;
513         int i, res;
514
515         bond_for_each_slave(bond, slave, i) {
516                 struct net_device *slave_dev = slave->dev;
517                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
518
519                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
520                     slave_ops->ndo_vlan_rx_kill_vid) {
521                         /* Save and then restore vlan_dev in the grp array,
522                          * since the slave's driver might clear it.
523                          */
524                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
525                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
526                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
527                 }
528         }
529
530         res = bond_del_vlan(bond, vid);
531         if (res) {
532                 printk(KERN_ERR DRV_NAME
533                        ": %s: Error: Failed to remove vlan id %d\n",
534                        bond_dev->name, vid);
535         }
536 }
537
538 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
539 {
540         struct vlan_entry *vlan;
541         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
542
543         write_lock_bh(&bond->lock);
544
545         if (list_empty(&bond->vlan_list))
546                 goto out;
547
548         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
549             slave_ops->ndo_vlan_rx_register)
550                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
551
552         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
553             !(slave_ops->ndo_vlan_rx_add_vid))
554                 goto out;
555
556         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
557                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
558
559 out:
560         write_unlock_bh(&bond->lock);
561 }
562
563 static void bond_del_vlans_from_slave(struct bonding *bond, struct net_device *slave_dev)
564 {
565         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
566         struct vlan_entry *vlan;
567         struct net_device *vlan_dev;
568
569         write_lock_bh(&bond->lock);
570
571         if (list_empty(&bond->vlan_list))
572                 goto out;
573
574         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
575             !(slave_ops->ndo_vlan_rx_kill_vid))
576                 goto unreg;
577
578         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
579                 /* Save and then restore vlan_dev in the grp array,
580                  * since the slave's driver might clear it.
581                  */
582                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
583                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
584                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
585         }
586
587 unreg:
588         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
589             slave_ops->ndo_vlan_rx_register)
590                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
591
592 out:
593         write_unlock_bh(&bond->lock);
594 }
595
596 /*------------------------------- Link status -------------------------------*/
597
598 /*
599  * Set the carrier state for the master according to the state of its
600  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
601  * do special 802.3ad magic.
602  *
603  * Returns zero if carrier state does not change, nonzero if it does.
604  */
605 static int bond_set_carrier(struct bonding *bond)
606 {
607         struct slave *slave;
608         int i;
609
610         if (bond->slave_cnt == 0)
611                 goto down;
612
613         if (bond->params.mode == BOND_MODE_8023AD)
614                 return bond_3ad_set_carrier(bond);
615
616         bond_for_each_slave(bond, slave, i) {
617                 if (slave->link == BOND_LINK_UP) {
618                         if (!netif_carrier_ok(bond->dev)) {
619                                 netif_carrier_on(bond->dev);
620                                 return 1;
621                         }
622                         return 0;
623                 }
624         }
625
626 down:
627         if (netif_carrier_ok(bond->dev)) {
628                 netif_carrier_off(bond->dev);
629                 return 1;
630         }
631         return 0;
632 }
633
634 /*
635  * Get link speed and duplex from the slave's base driver
636  * using ethtool. If for some reason the call fails or the
637  * values are invalid, fake speed and duplex to 100/Full
638  * and return error.
639  */
640 static int bond_update_speed_duplex(struct slave *slave)
641 {
642         struct net_device *slave_dev = slave->dev;
643         struct ethtool_cmd etool;
644         int res;
645
646         /* Fake speed and duplex */
647         slave->speed = SPEED_100;
648         slave->duplex = DUPLEX_FULL;
649
650         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
651                 return -1;
652
653         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
654         if (res < 0)
655                 return -1;
656
657         switch (etool.speed) {
658         case SPEED_10:
659         case SPEED_100:
660         case SPEED_1000:
661         case SPEED_10000:
662                 break;
663         default:
664                 return -1;
665         }
666
667         switch (etool.duplex) {
668         case DUPLEX_FULL:
669         case DUPLEX_HALF:
670                 break;
671         default:
672                 return -1;
673         }
674
675         slave->speed = etool.speed;
676         slave->duplex = etool.duplex;
677
678         return 0;
679 }
680
681 /*
682  * if <dev> supports MII link status reporting, check its link status.
683  *
684  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
685  * depening upon the setting of the use_carrier parameter.
686  *
687  * Return either BMSR_LSTATUS, meaning that the link is up (or we
688  * can't tell and just pretend it is), or 0, meaning that the link is
689  * down.
690  *
691  * If reporting is non-zero, instead of faking link up, return -1 if
692  * both ETHTOOL and MII ioctls fail (meaning the device does not
693  * support them).  If use_carrier is set, return whatever it says.
694  * It'd be nice if there was a good way to tell if a driver supports
695  * netif_carrier, but there really isn't.
696  */
697 static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting)
698 {
699         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
700         static int (* ioctl)(struct net_device *, struct ifreq *, int);
701         struct ifreq ifr;
702         struct mii_ioctl_data *mii;
703
704         if (bond->params.use_carrier)
705                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
706
707         ioctl = slave_ops->ndo_do_ioctl;
708         if (ioctl) {
709                 /* TODO: set pointer to correct ioctl on a per team member */
710                 /*       bases to make this more efficient. that is, once  */
711                 /*       we determine the correct ioctl, we will always    */
712                 /*       call it and not the others for that team          */
713                 /*       member.                                           */
714
715                 /*
716                  * We cannot assume that SIOCGMIIPHY will also read a
717                  * register; not all network drivers (e.g., e100)
718                  * support that.
719                  */
720
721                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
722                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
723                 mii = if_mii(&ifr);
724                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
725                         mii->reg_num = MII_BMSR;
726                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0) {
727                                 return (mii->val_out & BMSR_LSTATUS);
728                         }
729                 }
730         }
731
732         /*
733          * Some drivers cache ETHTOOL_GLINK for a period of time so we only
734          * attempt to get link status from it if the above MII ioctls fail.
735          */
736         if (slave_dev->ethtool_ops) {
737                 if (slave_dev->ethtool_ops->get_link) {
738                         u32 link;
739
740                         link = slave_dev->ethtool_ops->get_link(slave_dev);
741
742                         return link ? BMSR_LSTATUS : 0;
743                 }
744         }
745
746         /*
747          * If reporting, report that either there's no dev->do_ioctl,
748          * or both SIOCGMIIREG and get_link failed (meaning that we
749          * cannot report link status).  If not reporting, pretend
750          * we're ok.
751          */
752         return (reporting ? -1 : BMSR_LSTATUS);
753 }
754
755 /*----------------------------- Multicast list ------------------------------*/
756
757 /*
758  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
759  */
760 static inline int bond_is_dmi_same(struct dev_mc_list *dmi1, struct dev_mc_list *dmi2)
761 {
762         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
763                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
764 }
765
766 /*
767  * returns dmi entry if found, NULL otherwise
768  */
769 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
770 {
771         struct dev_mc_list *idmi;
772
773         for (idmi = mc_list; idmi; idmi = idmi->next) {
774                 if (bond_is_dmi_same(dmi, idmi)) {
775                         return idmi;
776                 }
777         }
778
779         return NULL;
780 }
781
782 /*
783  * Push the promiscuity flag down to appropriate slaves
784  */
785 static int bond_set_promiscuity(struct bonding *bond, int inc)
786 {
787         int err = 0;
788         if (USES_PRIMARY(bond->params.mode)) {
789                 /* write lock already acquired */
790                 if (bond->curr_active_slave) {
791                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
792                                                   inc);
793                 }
794         } else {
795                 struct slave *slave;
796                 int i;
797                 bond_for_each_slave(bond, slave, i) {
798                         err = dev_set_promiscuity(slave->dev, inc);
799                         if (err)
800                                 return err;
801                 }
802         }
803         return err;
804 }
805
806 /*
807  * Push the allmulti flag down to all slaves
808  */
809 static int bond_set_allmulti(struct bonding *bond, int inc)
810 {
811         int err = 0;
812         if (USES_PRIMARY(bond->params.mode)) {
813                 /* write lock already acquired */
814                 if (bond->curr_active_slave) {
815                         err = dev_set_allmulti(bond->curr_active_slave->dev,
816                                                inc);
817                 }
818         } else {
819                 struct slave *slave;
820                 int i;
821                 bond_for_each_slave(bond, slave, i) {
822                         err = dev_set_allmulti(slave->dev, inc);
823                         if (err)
824                                 return err;
825                 }
826         }
827         return err;
828 }
829
830 /*
831  * Add a Multicast address to slaves
832  * according to mode
833  */
834 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
835 {
836         if (USES_PRIMARY(bond->params.mode)) {
837                 /* write lock already acquired */
838                 if (bond->curr_active_slave) {
839                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
840                 }
841         } else {
842                 struct slave *slave;
843                 int i;
844                 bond_for_each_slave(bond, slave, i) {
845                         dev_mc_add(slave->dev, addr, alen, 0);
846                 }
847         }
848 }
849
850 /*
851  * Remove a multicast address from slave
852  * according to mode
853  */
854 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
855 {
856         if (USES_PRIMARY(bond->params.mode)) {
857                 /* write lock already acquired */
858                 if (bond->curr_active_slave) {
859                         dev_mc_delete(bond->curr_active_slave->dev, addr, alen, 0);
860                 }
861         } else {
862                 struct slave *slave;
863                 int i;
864                 bond_for_each_slave(bond, slave, i) {
865                         dev_mc_delete(slave->dev, addr, alen, 0);
866                 }
867         }
868 }
869
870
871 /*
872  * Retrieve the list of registered multicast addresses for the bonding
873  * device and retransmit an IGMP JOIN request to the current active
874  * slave.
875  */
876 static void bond_resend_igmp_join_requests(struct bonding *bond)
877 {
878         struct in_device *in_dev;
879         struct ip_mc_list *im;
880
881         rcu_read_lock();
882         in_dev = __in_dev_get_rcu(bond->dev);
883         if (in_dev) {
884                 for (im = in_dev->mc_list; im; im = im->next) {
885                         ip_mc_rejoin_group(im);
886                 }
887         }
888
889         rcu_read_unlock();
890 }
891
892 /*
893  * Totally destroys the mc_list in bond
894  */
895 static void bond_mc_list_destroy(struct bonding *bond)
896 {
897         struct dev_mc_list *dmi;
898
899         dmi = bond->mc_list;
900         while (dmi) {
901                 bond->mc_list = dmi->next;
902                 kfree(dmi);
903                 dmi = bond->mc_list;
904         }
905         bond->mc_list = NULL;
906 }
907
908 /*
909  * Copy all the Multicast addresses from src to the bonding device dst
910  */
911 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
912                              gfp_t gfp_flag)
913 {
914         struct dev_mc_list *dmi, *new_dmi;
915
916         for (dmi = mc_list; dmi; dmi = dmi->next) {
917                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
918
919                 if (!new_dmi) {
920                         /* FIXME: Potential memory leak !!! */
921                         return -ENOMEM;
922                 }
923
924                 new_dmi->next = bond->mc_list;
925                 bond->mc_list = new_dmi;
926                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
927                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
928                 new_dmi->dmi_users = dmi->dmi_users;
929                 new_dmi->dmi_gusers = dmi->dmi_gusers;
930         }
931
932         return 0;
933 }
934
935 /*
936  * flush all members of flush->mc_list from device dev->mc_list
937  */
938 static void bond_mc_list_flush(struct net_device *bond_dev, struct net_device *slave_dev)
939 {
940         struct bonding *bond = netdev_priv(bond_dev);
941         struct dev_mc_list *dmi;
942
943         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
944                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
945         }
946
947         if (bond->params.mode == BOND_MODE_8023AD) {
948                 /* del lacpdu mc addr from mc list */
949                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
950
951                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
952         }
953 }
954
955 /*--------------------------- Active slave change ---------------------------*/
956
957 /*
958  * Update the mc list and multicast-related flags for the new and
959  * old active slaves (if any) according to the multicast mode, and
960  * promiscuous flags unconditionally.
961  */
962 static void bond_mc_swap(struct bonding *bond, struct slave *new_active, struct slave *old_active)
963 {
964         struct dev_mc_list *dmi;
965
966         if (!USES_PRIMARY(bond->params.mode)) {
967                 /* nothing to do -  mc list is already up-to-date on
968                  * all slaves
969                  */
970                 return;
971         }
972
973         if (old_active) {
974                 if (bond->dev->flags & IFF_PROMISC) {
975                         dev_set_promiscuity(old_active->dev, -1);
976                 }
977
978                 if (bond->dev->flags & IFF_ALLMULTI) {
979                         dev_set_allmulti(old_active->dev, -1);
980                 }
981
982                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
983                         dev_mc_delete(old_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
984                 }
985         }
986
987         if (new_active) {
988                 /* FIXME: Signal errors upstream. */
989                 if (bond->dev->flags & IFF_PROMISC) {
990                         dev_set_promiscuity(new_active->dev, 1);
991                 }
992
993                 if (bond->dev->flags & IFF_ALLMULTI) {
994                         dev_set_allmulti(new_active->dev, 1);
995                 }
996
997                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next) {
998                         dev_mc_add(new_active->dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
999                 }
1000                 bond_resend_igmp_join_requests(bond);
1001         }
1002 }
1003
1004 /*
1005  * bond_do_fail_over_mac
1006  *
1007  * Perform special MAC address swapping for fail_over_mac settings
1008  *
1009  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
1010  */
1011 static void bond_do_fail_over_mac(struct bonding *bond,
1012                                   struct slave *new_active,
1013                                   struct slave *old_active)
1014 {
1015         u8 tmp_mac[ETH_ALEN];
1016         struct sockaddr saddr;
1017         int rv;
1018
1019         switch (bond->params.fail_over_mac) {
1020         case BOND_FOM_ACTIVE:
1021                 if (new_active)
1022                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1023                                new_active->dev->addr_len);
1024                 break;
1025         case BOND_FOM_FOLLOW:
1026                 /*
1027                  * if new_active && old_active, swap them
1028                  * if just old_active, do nothing (going to no active slave)
1029                  * if just new_active, set new_active to bond's MAC
1030                  */
1031                 if (!new_active)
1032                         return;
1033
1034                 write_unlock_bh(&bond->curr_slave_lock);
1035                 read_unlock(&bond->lock);
1036
1037                 if (old_active) {
1038                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1039                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1040                                ETH_ALEN);
1041                         saddr.sa_family = new_active->dev->type;
1042                 } else {
1043                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1044                         saddr.sa_family = bond->dev->type;
1045                 }
1046
1047                 rv = dev_set_mac_address(new_active->dev, &saddr);
1048                 if (rv) {
1049                         printk(KERN_ERR DRV_NAME
1050                                ": %s: Error %d setting MAC of slave %s\n",
1051                                bond->dev->name, -rv, new_active->dev->name);
1052                         goto out;
1053                 }
1054
1055                 if (!old_active)
1056                         goto out;
1057
1058                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1059                 saddr.sa_family = old_active->dev->type;
1060
1061                 rv = dev_set_mac_address(old_active->dev, &saddr);
1062                 if (rv)
1063                         printk(KERN_ERR DRV_NAME
1064                                ": %s: Error %d setting MAC of slave %s\n",
1065                                bond->dev->name, -rv, new_active->dev->name);
1066 out:
1067                 read_lock(&bond->lock);
1068                 write_lock_bh(&bond->curr_slave_lock);
1069                 break;
1070         default:
1071                 printk(KERN_ERR DRV_NAME
1072                        ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1073                        bond->dev->name, bond->params.fail_over_mac);
1074                 break;
1075         }
1076
1077 }
1078
1079
1080 /**
1081  * find_best_interface - select the best available slave to be the active one
1082  * @bond: our bonding struct
1083  *
1084  * Warning: Caller must hold curr_slave_lock for writing.
1085  */
1086 static struct slave *bond_find_best_slave(struct bonding *bond)
1087 {
1088         struct slave *new_active, *old_active;
1089         struct slave *bestslave = NULL;
1090         int mintime = bond->params.updelay;
1091         int i;
1092
1093         new_active = old_active = bond->curr_active_slave;
1094
1095         if (!new_active) { /* there were no active slaves left */
1096                 if (bond->slave_cnt > 0) {  /* found one slave */
1097                         new_active = bond->first_slave;
1098                 } else {
1099                         return NULL; /* still no slave, return NULL */
1100                 }
1101         }
1102
1103         /* first try the primary link; if arping, a link must tx/rx traffic
1104          * before it can be considered the curr_active_slave - also, we would skip
1105          * slaves between the curr_active_slave and primary_slave that may be up
1106          * and able to arp
1107          */
1108         if ((bond->primary_slave) &&
1109             (!bond->params.arp_interval) &&
1110             (IS_UP(bond->primary_slave->dev))) {
1111                 new_active = bond->primary_slave;
1112         }
1113
1114         /* remember where to stop iterating over the slaves */
1115         old_active = new_active;
1116
1117         bond_for_each_slave_from(bond, new_active, i, old_active) {
1118                 if (IS_UP(new_active->dev)) {
1119                         if (new_active->link == BOND_LINK_UP) {
1120                                 return new_active;
1121                         } else if (new_active->link == BOND_LINK_BACK) {
1122                                 /* link up, but waiting for stabilization */
1123                                 if (new_active->delay < mintime) {
1124                                         mintime = new_active->delay;
1125                                         bestslave = new_active;
1126                                 }
1127                         }
1128                 }
1129         }
1130
1131         return bestslave;
1132 }
1133
1134 /**
1135  * change_active_interface - change the active slave into the specified one
1136  * @bond: our bonding struct
1137  * @new: the new slave to make the active one
1138  *
1139  * Set the new slave to the bond's settings and unset them on the old
1140  * curr_active_slave.
1141  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1142  *
1143  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1144  * because it is apparently the best available slave we have, even though its
1145  * updelay hasn't timed out yet.
1146  *
1147  * If new_active is not NULL, caller must hold bond->lock for read and
1148  * curr_slave_lock for write_bh.
1149  */
1150 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1151 {
1152         struct slave *old_active = bond->curr_active_slave;
1153
1154         if (old_active == new_active) {
1155                 return;
1156         }
1157
1158         if (new_active) {
1159                 new_active->jiffies = jiffies;
1160
1161                 if (new_active->link == BOND_LINK_BACK) {
1162                         if (USES_PRIMARY(bond->params.mode)) {
1163                                 printk(KERN_INFO DRV_NAME
1164                                        ": %s: making interface %s the new "
1165                                        "active one %d ms earlier.\n",
1166                                        bond->dev->name, new_active->dev->name,
1167                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1168                         }
1169
1170                         new_active->delay = 0;
1171                         new_active->link = BOND_LINK_UP;
1172
1173                         if (bond->params.mode == BOND_MODE_8023AD) {
1174                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1175                         }
1176
1177                         if ((bond->params.mode == BOND_MODE_TLB) ||
1178                             (bond->params.mode == BOND_MODE_ALB)) {
1179                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1180                         }
1181                 } else {
1182                         if (USES_PRIMARY(bond->params.mode)) {
1183                                 printk(KERN_INFO DRV_NAME
1184                                        ": %s: making interface %s the new "
1185                                        "active one.\n",
1186                                        bond->dev->name, new_active->dev->name);
1187                         }
1188                 }
1189         }
1190
1191         if (USES_PRIMARY(bond->params.mode)) {
1192                 bond_mc_swap(bond, new_active, old_active);
1193         }
1194
1195         if ((bond->params.mode == BOND_MODE_TLB) ||
1196             (bond->params.mode == BOND_MODE_ALB)) {
1197                 bond_alb_handle_active_change(bond, new_active);
1198                 if (old_active)
1199                         bond_set_slave_inactive_flags(old_active);
1200                 if (new_active)
1201                         bond_set_slave_active_flags(new_active);
1202         } else {
1203                 bond->curr_active_slave = new_active;
1204         }
1205
1206         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1207                 if (old_active) {
1208                         bond_set_slave_inactive_flags(old_active);
1209                 }
1210
1211                 if (new_active) {
1212                         bond_set_slave_active_flags(new_active);
1213
1214                         if (bond->params.fail_over_mac)
1215                                 bond_do_fail_over_mac(bond, new_active,
1216                                                       old_active);
1217
1218                         bond->send_grat_arp = bond->params.num_grat_arp;
1219                         bond_send_gratuitous_arp(bond);
1220
1221                         bond->send_unsol_na = bond->params.num_unsol_na;
1222                         bond_send_unsolicited_na(bond);
1223
1224                         write_unlock_bh(&bond->curr_slave_lock);
1225                         read_unlock(&bond->lock);
1226
1227                         netdev_bonding_change(bond->dev);
1228
1229                         read_lock(&bond->lock);
1230                         write_lock_bh(&bond->curr_slave_lock);
1231                 }
1232         }
1233 }
1234
1235 /**
1236  * bond_select_active_slave - select a new active slave, if needed
1237  * @bond: our bonding struct
1238  *
1239  * This functions shoud be called when one of the following occurs:
1240  * - The old curr_active_slave has been released or lost its link.
1241  * - The primary_slave has got its link back.
1242  * - A slave has got its link back and there's no old curr_active_slave.
1243  *
1244  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1245  */
1246 void bond_select_active_slave(struct bonding *bond)
1247 {
1248         struct slave *best_slave;
1249         int rv;
1250
1251         best_slave = bond_find_best_slave(bond);
1252         if (best_slave != bond->curr_active_slave) {
1253                 bond_change_active_slave(bond, best_slave);
1254                 rv = bond_set_carrier(bond);
1255                 if (!rv)
1256                         return;
1257
1258                 if (netif_carrier_ok(bond->dev)) {
1259                         printk(KERN_INFO DRV_NAME
1260                                ": %s: first active interface up!\n",
1261                                bond->dev->name);
1262                 } else {
1263                         printk(KERN_INFO DRV_NAME ": %s: "
1264                                "now running without any active interface !\n",
1265                                bond->dev->name);
1266                 }
1267         }
1268 }
1269
1270 /*--------------------------- slave list handling ---------------------------*/
1271
1272 /*
1273  * This function attaches the slave to the end of list.
1274  *
1275  * bond->lock held for writing by caller.
1276  */
1277 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1278 {
1279         if (bond->first_slave == NULL) { /* attaching the first slave */
1280                 new_slave->next = new_slave;
1281                 new_slave->prev = new_slave;
1282                 bond->first_slave = new_slave;
1283         } else {
1284                 new_slave->next = bond->first_slave;
1285                 new_slave->prev = bond->first_slave->prev;
1286                 new_slave->next->prev = new_slave;
1287                 new_slave->prev->next = new_slave;
1288         }
1289
1290         bond->slave_cnt++;
1291 }
1292
1293 /*
1294  * This function detaches the slave from the list.
1295  * WARNING: no check is made to verify if the slave effectively
1296  * belongs to <bond>.
1297  * Nothing is freed on return, structures are just unchained.
1298  * If any slave pointer in bond was pointing to <slave>,
1299  * it should be changed by the calling function.
1300  *
1301  * bond->lock held for writing by caller.
1302  */
1303 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1304 {
1305         if (slave->next) {
1306                 slave->next->prev = slave->prev;
1307         }
1308
1309         if (slave->prev) {
1310                 slave->prev->next = slave->next;
1311         }
1312
1313         if (bond->first_slave == slave) { /* slave is the first slave */
1314                 if (bond->slave_cnt > 1) { /* there are more slave */
1315                         bond->first_slave = slave->next;
1316                 } else {
1317                         bond->first_slave = NULL; /* slave was the last one */
1318                 }
1319         }
1320
1321         slave->next = NULL;
1322         slave->prev = NULL;
1323         bond->slave_cnt--;
1324 }
1325
1326 /*---------------------------------- IOCTL ----------------------------------*/
1327
1328 static int bond_sethwaddr(struct net_device *bond_dev,
1329                           struct net_device *slave_dev)
1330 {
1331         dprintk("bond_dev=%p\n", bond_dev);
1332         dprintk("slave_dev=%p\n", slave_dev);
1333         dprintk("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1334         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1335         return 0;
1336 }
1337
1338 #define BOND_VLAN_FEATURES \
1339         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1340          NETIF_F_HW_VLAN_FILTER)
1341
1342 /* 
1343  * Compute the common dev->feature set available to all slaves.  Some
1344  * feature bits are managed elsewhere, so preserve those feature bits
1345  * on the master device.
1346  */
1347 static int bond_compute_features(struct bonding *bond)
1348 {
1349         struct slave *slave;
1350         struct net_device *bond_dev = bond->dev;
1351         unsigned long features = bond_dev->features;
1352         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1353                                                 bond_dev->hard_header_len);
1354         int i;
1355
1356         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1357         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1358
1359         if (!bond->first_slave)
1360                 goto done;
1361
1362         features &= ~NETIF_F_ONE_FOR_ALL;
1363
1364         bond_for_each_slave(bond, slave, i) {
1365                 features = netdev_increment_features(features,
1366                                                      slave->dev->features,
1367                                                      NETIF_F_ONE_FOR_ALL);
1368                 if (slave->dev->hard_header_len > max_hard_header_len)
1369                         max_hard_header_len = slave->dev->hard_header_len;
1370         }
1371
1372 done:
1373         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1374         bond_dev->features = netdev_fix_features(features, NULL);
1375         bond_dev->hard_header_len = max_hard_header_len;
1376
1377         return 0;
1378 }
1379
1380 static void bond_setup_by_slave(struct net_device *bond_dev,
1381                                 struct net_device *slave_dev)
1382 {
1383         struct bonding *bond = netdev_priv(bond_dev);
1384
1385         bond_dev->header_ops        = slave_dev->header_ops;
1386
1387         bond_dev->type              = slave_dev->type;
1388         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1389         bond_dev->addr_len          = slave_dev->addr_len;
1390
1391         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1392                 slave_dev->addr_len);
1393         bond->setup_by_slave = 1;
1394 }
1395
1396 /* enslave device <slave> to bond device <master> */
1397 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1398 {
1399         struct bonding *bond = netdev_priv(bond_dev);
1400         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1401         struct slave *new_slave = NULL;
1402         struct dev_mc_list *dmi;
1403         struct sockaddr addr;
1404         int link_reporting;
1405         int old_features = bond_dev->features;
1406         int res = 0;
1407
1408         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1409                 slave_ops->ndo_do_ioctl == NULL) {
1410                 printk(KERN_WARNING DRV_NAME
1411                        ": %s: Warning: no link monitoring support for %s\n",
1412                        bond_dev->name, slave_dev->name);
1413         }
1414
1415         /* bond must be initialized by bond_open() before enslaving */
1416         if (!(bond_dev->flags & IFF_UP)) {
1417                 printk(KERN_WARNING DRV_NAME
1418                         " %s: master_dev is not up in bond_enslave\n",
1419                         bond_dev->name);
1420         }
1421
1422         /* already enslaved */
1423         if (slave_dev->flags & IFF_SLAVE) {
1424                 dprintk("Error, Device was already enslaved\n");
1425                 return -EBUSY;
1426         }
1427
1428         /* vlan challenged mutual exclusion */
1429         /* no need to lock since we're protected by rtnl_lock */
1430         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1431                 dprintk("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1432                 if (!list_empty(&bond->vlan_list)) {
1433                         printk(KERN_ERR DRV_NAME
1434                                ": %s: Error: cannot enslave VLAN "
1435                                "challenged slave %s on VLAN enabled "
1436                                "bond %s\n", bond_dev->name, slave_dev->name,
1437                                bond_dev->name);
1438                         return -EPERM;
1439                 } else {
1440                         printk(KERN_WARNING DRV_NAME
1441                                ": %s: Warning: enslaved VLAN challenged "
1442                                "slave %s. Adding VLANs will be blocked as "
1443                                "long as %s is part of bond %s\n",
1444                                bond_dev->name, slave_dev->name, slave_dev->name,
1445                                bond_dev->name);
1446                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1447                 }
1448         } else {
1449                 dprintk("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1450                 if (bond->slave_cnt == 0) {
1451                         /* First slave, and it is not VLAN challenged,
1452                          * so remove the block of adding VLANs over the bond.
1453                          */
1454                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1455                 }
1456         }
1457
1458         /*
1459          * Old ifenslave binaries are no longer supported.  These can
1460          * be identified with moderate accurary by the state of the slave:
1461          * the current ifenslave will set the interface down prior to
1462          * enslaving it; the old ifenslave will not.
1463          */
1464         if ((slave_dev->flags & IFF_UP)) {
1465                 printk(KERN_ERR DRV_NAME ": %s is up. "
1466                        "This may be due to an out of date ifenslave.\n",
1467                        slave_dev->name);
1468                 res = -EPERM;
1469                 goto err_undo_flags;
1470         }
1471
1472         /* set bonding device ether type by slave - bonding netdevices are
1473          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1474          * there is a need to override some of the type dependent attribs/funcs.
1475          *
1476          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1477          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1478          */
1479         if (bond->slave_cnt == 0) {
1480                 if (slave_dev->type != ARPHRD_ETHER)
1481                         bond_setup_by_slave(bond_dev, slave_dev);
1482         } else if (bond_dev->type != slave_dev->type) {
1483                 printk(KERN_ERR DRV_NAME ": %s ether type (%d) is different "
1484                         "from other slaves (%d), can not enslave it.\n",
1485                         slave_dev->name,
1486                         slave_dev->type, bond_dev->type);
1487                         res = -EINVAL;
1488                         goto err_undo_flags;
1489         }
1490
1491         if (slave_ops->ndo_set_mac_address == NULL) {
1492                 if (bond->slave_cnt == 0) {
1493                         printk(KERN_WARNING DRV_NAME
1494                                ": %s: Warning: The first slave device "
1495                                "specified does not support setting the MAC "
1496                                "address. Setting fail_over_mac to active.",
1497                                bond_dev->name);
1498                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1499                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1500                         printk(KERN_ERR DRV_NAME
1501                                 ": %s: Error: The slave device specified "
1502                                 "does not support setting the MAC address, "
1503                                 "but fail_over_mac is not set to active.\n"
1504                                 , bond_dev->name);
1505                         res = -EOPNOTSUPP;
1506                         goto err_undo_flags;
1507                 }
1508         }
1509
1510         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1511         if (!new_slave) {
1512                 res = -ENOMEM;
1513                 goto err_undo_flags;
1514         }
1515
1516         /* save slave's original flags before calling
1517          * netdev_set_master and dev_open
1518          */
1519         new_slave->original_flags = slave_dev->flags;
1520
1521         /*
1522          * Save slave's original ("permanent") mac address for modes
1523          * that need it, and for restoring it upon release, and then
1524          * set it to the master's address
1525          */
1526         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1527
1528         if (!bond->params.fail_over_mac) {
1529                 /*
1530                  * Set slave to master's mac address.  The application already
1531                  * set the master's mac address to that of the first slave
1532                  */
1533                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1534                 addr.sa_family = slave_dev->type;
1535                 res = dev_set_mac_address(slave_dev, &addr);
1536                 if (res) {
1537                         dprintk("Error %d calling set_mac_address\n", res);
1538                         goto err_free;
1539                 }
1540         }
1541
1542         res = netdev_set_master(slave_dev, bond_dev);
1543         if (res) {
1544                 dprintk("Error %d calling netdev_set_master\n", res);
1545                 goto err_restore_mac;
1546         }
1547         /* open the slave since the application closed it */
1548         res = dev_open(slave_dev);
1549         if (res) {
1550                 dprintk("Openning slave %s failed\n", slave_dev->name);
1551                 goto err_unset_master;
1552         }
1553
1554         new_slave->dev = slave_dev;
1555         slave_dev->priv_flags |= IFF_BONDING;
1556
1557         if ((bond->params.mode == BOND_MODE_TLB) ||
1558             (bond->params.mode == BOND_MODE_ALB)) {
1559                 /* bond_alb_init_slave() must be called before all other stages since
1560                  * it might fail and we do not want to have to undo everything
1561                  */
1562                 res = bond_alb_init_slave(bond, new_slave);
1563                 if (res) {
1564                         goto err_close;
1565                 }
1566         }
1567
1568         /* If the mode USES_PRIMARY, then the new slave gets the
1569          * master's promisc (and mc) settings only if it becomes the
1570          * curr_active_slave, and that is taken care of later when calling
1571          * bond_change_active()
1572          */
1573         if (!USES_PRIMARY(bond->params.mode)) {
1574                 /* set promiscuity level to new slave */
1575                 if (bond_dev->flags & IFF_PROMISC) {
1576                         res = dev_set_promiscuity(slave_dev, 1);
1577                         if (res)
1578                                 goto err_close;
1579                 }
1580
1581                 /* set allmulti level to new slave */
1582                 if (bond_dev->flags & IFF_ALLMULTI) {
1583                         res = dev_set_allmulti(slave_dev, 1);
1584                         if (res)
1585                                 goto err_close;
1586                 }
1587
1588                 netif_addr_lock_bh(bond_dev);
1589                 /* upload master's mc_list to new slave */
1590                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
1591                         dev_mc_add (slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
1592                 }
1593                 netif_addr_unlock_bh(bond_dev);
1594         }
1595
1596         if (bond->params.mode == BOND_MODE_8023AD) {
1597                 /* add lacpdu mc addr to mc list */
1598                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1599
1600                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1601         }
1602
1603         bond_add_vlans_on_slave(bond, slave_dev);
1604
1605         write_lock_bh(&bond->lock);
1606
1607         bond_attach_slave(bond, new_slave);
1608
1609         new_slave->delay = 0;
1610         new_slave->link_failure_count = 0;
1611
1612         bond_compute_features(bond);
1613
1614         write_unlock_bh(&bond->lock);
1615
1616         read_lock(&bond->lock);
1617
1618         new_slave->last_arp_rx = jiffies;
1619
1620         if (bond->params.miimon && !bond->params.use_carrier) {
1621                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1622
1623                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1624                         /*
1625                          * miimon is set but a bonded network driver
1626                          * does not support ETHTOOL/MII and
1627                          * arp_interval is not set.  Note: if
1628                          * use_carrier is enabled, we will never go
1629                          * here (because netif_carrier is always
1630                          * supported); thus, we don't need to change
1631                          * the messages for netif_carrier.
1632                          */
1633                         printk(KERN_WARNING DRV_NAME
1634                                ": %s: Warning: MII and ETHTOOL support not "
1635                                "available for interface %s, and "
1636                                "arp_interval/arp_ip_target module parameters "
1637                                "not specified, thus bonding will not detect "
1638                                "link failures! see bonding.txt for details.\n",
1639                                bond_dev->name, slave_dev->name);
1640                 } else if (link_reporting == -1) {
1641                         /* unable get link status using mii/ethtool */
1642                         printk(KERN_WARNING DRV_NAME
1643                                ": %s: Warning: can't get link status from "
1644                                "interface %s; the network driver associated "
1645                                "with this interface does not support MII or "
1646                                "ETHTOOL link status reporting, thus miimon "
1647                                "has no effect on this interface.\n",
1648                                bond_dev->name, slave_dev->name);
1649                 }
1650         }
1651
1652         /* check for initial state */
1653         if (!bond->params.miimon ||
1654             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1655                 if (bond->params.updelay) {
1656                         dprintk("Initial state of slave_dev is "
1657                                 "BOND_LINK_BACK\n");
1658                         new_slave->link  = BOND_LINK_BACK;
1659                         new_slave->delay = bond->params.updelay;
1660                 } else {
1661                         dprintk("Initial state of slave_dev is "
1662                                 "BOND_LINK_UP\n");
1663                         new_slave->link  = BOND_LINK_UP;
1664                 }
1665                 new_slave->jiffies = jiffies;
1666         } else {
1667                 dprintk("Initial state of slave_dev is "
1668                         "BOND_LINK_DOWN\n");
1669                 new_slave->link  = BOND_LINK_DOWN;
1670         }
1671
1672         if (bond_update_speed_duplex(new_slave) &&
1673             (new_slave->link != BOND_LINK_DOWN)) {
1674                 printk(KERN_WARNING DRV_NAME
1675                        ": %s: Warning: failed to get speed and duplex from %s, "
1676                        "assumed to be 100Mb/sec and Full.\n",
1677                        bond_dev->name, new_slave->dev->name);
1678
1679                 if (bond->params.mode == BOND_MODE_8023AD) {
1680                         printk(KERN_WARNING DRV_NAME
1681                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1682                                "support in base driver for proper aggregator "
1683                                "selection.\n", bond_dev->name);
1684                 }
1685         }
1686
1687         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1688                 /* if there is a primary slave, remember it */
1689                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1690                         bond->primary_slave = new_slave;
1691                 }
1692         }
1693
1694         write_lock_bh(&bond->curr_slave_lock);
1695
1696         switch (bond->params.mode) {
1697         case BOND_MODE_ACTIVEBACKUP:
1698                 bond_set_slave_inactive_flags(new_slave);
1699                 bond_select_active_slave(bond);
1700                 break;
1701         case BOND_MODE_8023AD:
1702                 /* in 802.3ad mode, the internal mechanism
1703                  * will activate the slaves in the selected
1704                  * aggregator
1705                  */
1706                 bond_set_slave_inactive_flags(new_slave);
1707                 /* if this is the first slave */
1708                 if (bond->slave_cnt == 1) {
1709                         SLAVE_AD_INFO(new_slave).id = 1;
1710                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1711                          * can be called only after the mac address of the bond is set
1712                          */
1713                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1714                                             bond->params.lacp_fast);
1715                 } else {
1716                         SLAVE_AD_INFO(new_slave).id =
1717                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1718                 }
1719
1720                 bond_3ad_bind_slave(new_slave);
1721                 break;
1722         case BOND_MODE_TLB:
1723         case BOND_MODE_ALB:
1724                 new_slave->state = BOND_STATE_ACTIVE;
1725                 bond_set_slave_inactive_flags(new_slave);
1726                 break;
1727         default:
1728                 dprintk("This slave is always active in trunk mode\n");
1729
1730                 /* always active in trunk mode */
1731                 new_slave->state = BOND_STATE_ACTIVE;
1732
1733                 /* In trunking mode there is little meaning to curr_active_slave
1734                  * anyway (it holds no special properties of the bond device),
1735                  * so we can change it without calling change_active_interface()
1736                  */
1737                 if (!bond->curr_active_slave) {
1738                         bond->curr_active_slave = new_slave;
1739                 }
1740                 break;
1741         } /* switch(bond_mode) */
1742
1743         write_unlock_bh(&bond->curr_slave_lock);
1744
1745         bond_set_carrier(bond);
1746
1747         read_unlock(&bond->lock);
1748
1749         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1750         if (res)
1751                 goto err_close;
1752
1753         printk(KERN_INFO DRV_NAME
1754                ": %s: enslaving %s as a%s interface with a%s link.\n",
1755                bond_dev->name, slave_dev->name,
1756                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1757                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1758
1759         /* enslave is successful */
1760         return 0;
1761
1762 /* Undo stages on error */
1763 err_close:
1764         dev_close(slave_dev);
1765
1766 err_unset_master:
1767         netdev_set_master(slave_dev, NULL);
1768
1769 err_restore_mac:
1770         if (!bond->params.fail_over_mac) {
1771                 /* XXX TODO - fom follow mode needs to change master's
1772                  * MAC if this slave's MAC is in use by the bond, or at
1773                  * least print a warning.
1774                  */
1775                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1776                 addr.sa_family = slave_dev->type;
1777                 dev_set_mac_address(slave_dev, &addr);
1778         }
1779
1780 err_free:
1781         kfree(new_slave);
1782
1783 err_undo_flags:
1784         bond_dev->features = old_features;
1785  
1786         return res;
1787 }
1788
1789 /*
1790  * Try to release the slave device <slave> from the bond device <master>
1791  * It is legal to access curr_active_slave without a lock because all the function
1792  * is write-locked.
1793  *
1794  * The rules for slave state should be:
1795  *   for Active/Backup:
1796  *     Active stays on all backups go down
1797  *   for Bonded connections:
1798  *     The first up interface should be left on and all others downed.
1799  */
1800 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1801 {
1802         struct bonding *bond = netdev_priv(bond_dev);
1803         struct slave *slave, *oldcurrent;
1804         struct sockaddr addr;
1805         int mac_addr_differ;
1806
1807         /* slave is not a slave or master is not master of this slave */
1808         if (!(slave_dev->flags & IFF_SLAVE) ||
1809             (slave_dev->master != bond_dev)) {
1810                 printk(KERN_ERR DRV_NAME
1811                        ": %s: Error: cannot release %s.\n",
1812                        bond_dev->name, slave_dev->name);
1813                 return -EINVAL;
1814         }
1815
1816         write_lock_bh(&bond->lock);
1817
1818         slave = bond_get_slave_by_dev(bond, slave_dev);
1819         if (!slave) {
1820                 /* not a slave of this bond */
1821                 printk(KERN_INFO DRV_NAME
1822                        ": %s: %s not enslaved\n",
1823                        bond_dev->name, slave_dev->name);
1824                 write_unlock_bh(&bond->lock);
1825                 return -EINVAL;
1826         }
1827
1828         if (!bond->params.fail_over_mac) {
1829                 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1830                                          ETH_ALEN);
1831                 if (!mac_addr_differ && (bond->slave_cnt > 1))
1832                         printk(KERN_WARNING DRV_NAME
1833                                ": %s: Warning: the permanent HWaddr of %s - "
1834                                "%pM - is still in use by %s. "
1835                                "Set the HWaddr of %s to a different address "
1836                                "to avoid conflicts.\n",
1837                                bond_dev->name, slave_dev->name,
1838                                slave->perm_hwaddr,
1839                                bond_dev->name, slave_dev->name);
1840         }
1841
1842         /* Inform AD package of unbinding of slave. */
1843         if (bond->params.mode == BOND_MODE_8023AD) {
1844                 /* must be called before the slave is
1845                  * detached from the list
1846                  */
1847                 bond_3ad_unbind_slave(slave);
1848         }
1849
1850         printk(KERN_INFO DRV_NAME
1851                ": %s: releasing %s interface %s\n",
1852                bond_dev->name,
1853                (slave->state == BOND_STATE_ACTIVE)
1854                ? "active" : "backup",
1855                slave_dev->name);
1856
1857         oldcurrent = bond->curr_active_slave;
1858
1859         bond->current_arp_slave = NULL;
1860
1861         /* release the slave from its bond */
1862         bond_detach_slave(bond, slave);
1863
1864         bond_compute_features(bond);
1865
1866         if (bond->primary_slave == slave) {
1867                 bond->primary_slave = NULL;
1868         }
1869
1870         if (oldcurrent == slave) {
1871                 bond_change_active_slave(bond, NULL);
1872         }
1873
1874         if ((bond->params.mode == BOND_MODE_TLB) ||
1875             (bond->params.mode == BOND_MODE_ALB)) {
1876                 /* Must be called only after the slave has been
1877                  * detached from the list and the curr_active_slave
1878                  * has been cleared (if our_slave == old_current),
1879                  * but before a new active slave is selected.
1880                  */
1881                 write_unlock_bh(&bond->lock);
1882                 bond_alb_deinit_slave(bond, slave);
1883                 write_lock_bh(&bond->lock);
1884         }
1885
1886         if (oldcurrent == slave) {
1887                 /*
1888                  * Note that we hold RTNL over this sequence, so there
1889                  * is no concern that another slave add/remove event
1890                  * will interfere.
1891                  */
1892                 write_unlock_bh(&bond->lock);
1893                 read_lock(&bond->lock);
1894                 write_lock_bh(&bond->curr_slave_lock);
1895
1896                 bond_select_active_slave(bond);
1897
1898                 write_unlock_bh(&bond->curr_slave_lock);
1899                 read_unlock(&bond->lock);
1900                 write_lock_bh(&bond->lock);
1901         }
1902
1903         if (bond->slave_cnt == 0) {
1904                 bond_set_carrier(bond);
1905
1906                 /* if the last slave was removed, zero the mac address
1907                  * of the master so it will be set by the application
1908                  * to the mac address of the first slave
1909                  */
1910                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1911
1912                 if (list_empty(&bond->vlan_list)) {
1913                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1914                 } else {
1915                         printk(KERN_WARNING DRV_NAME
1916                                ": %s: Warning: clearing HW address of %s while it "
1917                                "still has VLANs.\n",
1918                                bond_dev->name, bond_dev->name);
1919                         printk(KERN_WARNING DRV_NAME
1920                                ": %s: When re-adding slaves, make sure the bond's "
1921                                "HW address matches its VLANs'.\n",
1922                                bond_dev->name);
1923                 }
1924         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1925                    !bond_has_challenged_slaves(bond)) {
1926                 printk(KERN_INFO DRV_NAME
1927                        ": %s: last VLAN challenged slave %s "
1928                        "left bond %s. VLAN blocking is removed\n",
1929                        bond_dev->name, slave_dev->name, bond_dev->name);
1930                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1931         }
1932
1933         write_unlock_bh(&bond->lock);
1934
1935         /* must do this from outside any spinlocks */
1936         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1937
1938         bond_del_vlans_from_slave(bond, slave_dev);
1939
1940         /* If the mode USES_PRIMARY, then we should only remove its
1941          * promisc and mc settings if it was the curr_active_slave, but that was
1942          * already taken care of above when we detached the slave
1943          */
1944         if (!USES_PRIMARY(bond->params.mode)) {
1945                 /* unset promiscuity level from slave */
1946                 if (bond_dev->flags & IFF_PROMISC) {
1947                         dev_set_promiscuity(slave_dev, -1);
1948                 }
1949
1950                 /* unset allmulti level from slave */
1951                 if (bond_dev->flags & IFF_ALLMULTI) {
1952                         dev_set_allmulti(slave_dev, -1);
1953                 }
1954
1955                 /* flush master's mc_list from slave */
1956                 netif_addr_lock_bh(bond_dev);
1957                 bond_mc_list_flush(bond_dev, slave_dev);
1958                 netif_addr_unlock_bh(bond_dev);
1959         }
1960
1961         netdev_set_master(slave_dev, NULL);
1962
1963         /* close slave before restoring its mac address */
1964         dev_close(slave_dev);
1965
1966         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1967                 /* restore original ("permanent") mac address */
1968                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1969                 addr.sa_family = slave_dev->type;
1970                 dev_set_mac_address(slave_dev, &addr);
1971         }
1972
1973         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1974                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1975                                    IFF_SLAVE_NEEDARP);
1976
1977         kfree(slave);
1978
1979         return 0;  /* deletion OK */
1980 }
1981
1982 /*
1983 * Destroy a bonding device.
1984 * Must be under rtnl_lock when this function is called.
1985 */
1986 void bond_destroy(struct bonding *bond)
1987 {
1988         bond_deinit(bond->dev);
1989         bond_destroy_sysfs_entry(bond);
1990         unregister_netdevice(bond->dev);
1991 }
1992
1993 static void bond_destructor(struct net_device *bond_dev)
1994 {
1995         struct bonding *bond = bond_dev->priv;
1996
1997         if (bond->wq)
1998                 destroy_workqueue(bond->wq);
1999
2000         netif_addr_lock_bh(bond_dev);
2001         bond_mc_list_destroy(bond);
2002         netif_addr_unlock_bh(bond_dev);
2003
2004         free_netdev(bond_dev);
2005 }
2006
2007 /*
2008 * First release a slave and than destroy the bond if no more slaves iare left.
2009 * Must be under rtnl_lock when this function is called.
2010 */
2011 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev)
2012 {
2013         struct bonding *bond = netdev_priv(bond_dev);
2014         int ret;
2015
2016         ret = bond_release(bond_dev, slave_dev);
2017         if ((ret == 0) && (bond->slave_cnt == 0)) {
2018                 printk(KERN_INFO DRV_NAME ": %s: destroying bond %s.\n",
2019                        bond_dev->name, bond_dev->name);
2020                 bond_destroy(bond);
2021         }
2022         return ret;
2023 }
2024
2025 /*
2026  * This function releases all slaves.
2027  */
2028 static int bond_release_all(struct net_device *bond_dev)
2029 {
2030         struct bonding *bond = netdev_priv(bond_dev);
2031         struct slave *slave;
2032         struct net_device *slave_dev;
2033         struct sockaddr addr;
2034
2035         write_lock_bh(&bond->lock);
2036
2037         netif_carrier_off(bond_dev);
2038
2039         if (bond->slave_cnt == 0) {
2040                 goto out;
2041         }
2042
2043         bond->current_arp_slave = NULL;
2044         bond->primary_slave = NULL;
2045         bond_change_active_slave(bond, NULL);
2046
2047         while ((slave = bond->first_slave) != NULL) {
2048                 /* Inform AD package of unbinding of slave
2049                  * before slave is detached from the list.
2050                  */
2051                 if (bond->params.mode == BOND_MODE_8023AD) {
2052                         bond_3ad_unbind_slave(slave);
2053                 }
2054
2055                 slave_dev = slave->dev;
2056                 bond_detach_slave(bond, slave);
2057
2058                 /* now that the slave is detached, unlock and perform
2059                  * all the undo steps that should not be called from
2060                  * within a lock.
2061                  */
2062                 write_unlock_bh(&bond->lock);
2063
2064                 if ((bond->params.mode == BOND_MODE_TLB) ||
2065                     (bond->params.mode == BOND_MODE_ALB)) {
2066                         /* must be called only after the slave
2067                          * has been detached from the list
2068                          */
2069                         bond_alb_deinit_slave(bond, slave);
2070                 }
2071
2072                 bond_compute_features(bond);
2073
2074                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2075                 bond_del_vlans_from_slave(bond, slave_dev);
2076
2077                 /* If the mode USES_PRIMARY, then we should only remove its
2078                  * promisc and mc settings if it was the curr_active_slave, but that was
2079                  * already taken care of above when we detached the slave
2080                  */
2081                 if (!USES_PRIMARY(bond->params.mode)) {
2082                         /* unset promiscuity level from slave */
2083                         if (bond_dev->flags & IFF_PROMISC) {
2084                                 dev_set_promiscuity(slave_dev, -1);
2085                         }
2086
2087                         /* unset allmulti level from slave */
2088                         if (bond_dev->flags & IFF_ALLMULTI) {
2089                                 dev_set_allmulti(slave_dev, -1);
2090                         }
2091
2092                         /* flush master's mc_list from slave */
2093                         netif_addr_lock_bh(bond_dev);
2094                         bond_mc_list_flush(bond_dev, slave_dev);
2095                         netif_addr_unlock_bh(bond_dev);
2096                 }
2097
2098                 netdev_set_master(slave_dev, NULL);
2099
2100                 /* close slave before restoring its mac address */
2101                 dev_close(slave_dev);
2102
2103                 if (!bond->params.fail_over_mac) {
2104                         /* restore original ("permanent") mac address*/
2105                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2106                         addr.sa_family = slave_dev->type;
2107                         dev_set_mac_address(slave_dev, &addr);
2108                 }
2109
2110                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2111                                            IFF_SLAVE_INACTIVE);
2112
2113                 kfree(slave);
2114
2115                 /* re-acquire the lock before getting the next slave */
2116                 write_lock_bh(&bond->lock);
2117         }
2118
2119         /* zero the mac address of the master so it will be
2120          * set by the application to the mac address of the
2121          * first slave
2122          */
2123         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2124
2125         if (list_empty(&bond->vlan_list)) {
2126                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2127         } else {
2128                 printk(KERN_WARNING DRV_NAME
2129                        ": %s: Warning: clearing HW address of %s while it "
2130                        "still has VLANs.\n",
2131                        bond_dev->name, bond_dev->name);
2132                 printk(KERN_WARNING DRV_NAME
2133                        ": %s: When re-adding slaves, make sure the bond's "
2134                        "HW address matches its VLANs'.\n",
2135                        bond_dev->name);
2136         }
2137
2138         printk(KERN_INFO DRV_NAME
2139                ": %s: released all slaves\n",
2140                bond_dev->name);
2141
2142 out:
2143         write_unlock_bh(&bond->lock);
2144
2145         return 0;
2146 }
2147
2148 /*
2149  * This function changes the active slave to slave <slave_dev>.
2150  * It returns -EINVAL in the following cases.
2151  *  - <slave_dev> is not found in the list.
2152  *  - There is not active slave now.
2153  *  - <slave_dev> is already active.
2154  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2155  *  - <slave_dev> is not running.
2156  * In these cases, this fuction does nothing.
2157  * In the other cases, currnt_slave pointer is changed and 0 is returned.
2158  */
2159 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2160 {
2161         struct bonding *bond = netdev_priv(bond_dev);
2162         struct slave *old_active = NULL;
2163         struct slave *new_active = NULL;
2164         int res = 0;
2165
2166         if (!USES_PRIMARY(bond->params.mode)) {
2167                 return -EINVAL;
2168         }
2169
2170         /* Verify that master_dev is indeed the master of slave_dev */
2171         if (!(slave_dev->flags & IFF_SLAVE) ||
2172             (slave_dev->master != bond_dev)) {
2173                 return -EINVAL;
2174         }
2175
2176         read_lock(&bond->lock);
2177
2178         read_lock(&bond->curr_slave_lock);
2179         old_active = bond->curr_active_slave;
2180         read_unlock(&bond->curr_slave_lock);
2181
2182         new_active = bond_get_slave_by_dev(bond, slave_dev);
2183
2184         /*
2185          * Changing to the current active: do nothing; return success.
2186          */
2187         if (new_active && (new_active == old_active)) {
2188                 read_unlock(&bond->lock);
2189                 return 0;
2190         }
2191
2192         if ((new_active) &&
2193             (old_active) &&
2194             (new_active->link == BOND_LINK_UP) &&
2195             IS_UP(new_active->dev)) {
2196                 write_lock_bh(&bond->curr_slave_lock);
2197                 bond_change_active_slave(bond, new_active);
2198                 write_unlock_bh(&bond->curr_slave_lock);
2199         } else {
2200                 res = -EINVAL;
2201         }
2202
2203         read_unlock(&bond->lock);
2204
2205         return res;
2206 }
2207
2208 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2209 {
2210         struct bonding *bond = netdev_priv(bond_dev);
2211
2212         info->bond_mode = bond->params.mode;
2213         info->miimon = bond->params.miimon;
2214
2215         read_lock(&bond->lock);
2216         info->num_slaves = bond->slave_cnt;
2217         read_unlock(&bond->lock);
2218
2219         return 0;
2220 }
2221
2222 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2223 {
2224         struct bonding *bond = netdev_priv(bond_dev);
2225         struct slave *slave;
2226         int i, found = 0;
2227
2228         if (info->slave_id < 0) {
2229                 return -ENODEV;
2230         }
2231
2232         read_lock(&bond->lock);
2233
2234         bond_for_each_slave(bond, slave, i) {
2235                 if (i == (int)info->slave_id) {
2236                         found = 1;
2237                         break;
2238                 }
2239         }
2240
2241         read_unlock(&bond->lock);
2242
2243         if (found) {
2244                 strcpy(info->slave_name, slave->dev->name);
2245                 info->link = slave->link;
2246                 info->state = slave->state;
2247                 info->link_failure_count = slave->link_failure_count;
2248         } else {
2249                 return -ENODEV;
2250         }
2251
2252         return 0;
2253 }
2254
2255 /*-------------------------------- Monitoring -------------------------------*/
2256
2257
2258 static int bond_miimon_inspect(struct bonding *bond)
2259 {
2260         struct slave *slave;
2261         int i, link_state, commit = 0;
2262
2263         bond_for_each_slave(bond, slave, i) {
2264                 slave->new_link = BOND_LINK_NOCHANGE;
2265
2266                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2267
2268                 switch (slave->link) {
2269                 case BOND_LINK_UP:
2270                         if (link_state)
2271                                 continue;
2272
2273                         slave->link = BOND_LINK_FAIL;
2274                         slave->delay = bond->params.downdelay;
2275                         if (slave->delay) {
2276                                 printk(KERN_INFO DRV_NAME
2277                                        ": %s: link status down for %s"
2278                                        "interface %s, disabling it in %d ms.\n",
2279                                        bond->dev->name,
2280                                        (bond->params.mode ==
2281                                         BOND_MODE_ACTIVEBACKUP) ?
2282                                        ((slave->state == BOND_STATE_ACTIVE) ?
2283                                         "active " : "backup ") : "",
2284                                        slave->dev->name,
2285                                        bond->params.downdelay * bond->params.miimon);
2286                         }
2287                         /*FALLTHRU*/
2288                 case BOND_LINK_FAIL:
2289                         if (link_state) {
2290                                 /*
2291                                  * recovered before downdelay expired
2292                                  */
2293                                 slave->link = BOND_LINK_UP;
2294                                 slave->jiffies = jiffies;
2295                                 printk(KERN_INFO DRV_NAME
2296                                        ": %s: link status up again after %d "
2297                                        "ms for interface %s.\n",
2298                                        bond->dev->name,
2299                                        (bond->params.downdelay - slave->delay) *
2300                                        bond->params.miimon,
2301                                        slave->dev->name);
2302                                 continue;
2303                         }
2304
2305                         if (slave->delay <= 0) {
2306                                 slave->new_link = BOND_LINK_DOWN;
2307                                 commit++;
2308                                 continue;
2309                         }
2310
2311                         slave->delay--;
2312                         break;
2313
2314                 case BOND_LINK_DOWN:
2315                         if (!link_state)
2316                                 continue;
2317
2318                         slave->link = BOND_LINK_BACK;
2319                         slave->delay = bond->params.updelay;
2320
2321                         if (slave->delay) {
2322                                 printk(KERN_INFO DRV_NAME
2323                                        ": %s: link status up for "
2324                                        "interface %s, enabling it in %d ms.\n",
2325                                        bond->dev->name, slave->dev->name,
2326                                        bond->params.updelay *
2327                                        bond->params.miimon);
2328                         }
2329                         /*FALLTHRU*/
2330                 case BOND_LINK_BACK:
2331                         if (!link_state) {
2332                                 slave->link = BOND_LINK_DOWN;
2333                                 printk(KERN_INFO DRV_NAME
2334                                        ": %s: link status down again after %d "
2335                                        "ms for interface %s.\n",
2336                                        bond->dev->name,
2337                                        (bond->params.updelay - slave->delay) *
2338                                        bond->params.miimon,
2339                                        slave->dev->name);
2340
2341                                 continue;
2342                         }
2343
2344                         if (slave->delay <= 0) {
2345                                 slave->new_link = BOND_LINK_UP;
2346                                 commit++;
2347                                 continue;
2348                         }
2349
2350                         slave->delay--;
2351                         break;
2352                 }
2353         }
2354
2355         return commit;
2356 }
2357
2358 static void bond_miimon_commit(struct bonding *bond)
2359 {
2360         struct slave *slave;
2361         int i;
2362
2363         bond_for_each_slave(bond, slave, i) {
2364                 switch (slave->new_link) {
2365                 case BOND_LINK_NOCHANGE:
2366                         continue;
2367
2368                 case BOND_LINK_UP:
2369                         slave->link = BOND_LINK_UP;
2370                         slave->jiffies = jiffies;
2371
2372                         if (bond->params.mode == BOND_MODE_8023AD) {
2373                                 /* prevent it from being the active one */
2374                                 slave->state = BOND_STATE_BACKUP;
2375                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2376                                 /* make it immediately active */
2377                                 slave->state = BOND_STATE_ACTIVE;
2378                         } else if (slave != bond->primary_slave) {
2379                                 /* prevent it from being the active one */
2380                                 slave->state = BOND_STATE_BACKUP;
2381                         }
2382
2383                         printk(KERN_INFO DRV_NAME
2384                                ": %s: link status definitely "
2385                                "up for interface %s.\n",
2386                                bond->dev->name, slave->dev->name);
2387
2388                         /* notify ad that the link status has changed */
2389                         if (bond->params.mode == BOND_MODE_8023AD)
2390                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2391
2392                         if ((bond->params.mode == BOND_MODE_TLB) ||
2393                             (bond->params.mode == BOND_MODE_ALB))
2394                                 bond_alb_handle_link_change(bond, slave,
2395                                                             BOND_LINK_UP);
2396
2397                         if (!bond->curr_active_slave ||
2398                             (slave == bond->primary_slave))
2399                                 goto do_failover;
2400
2401                         continue;
2402
2403                 case BOND_LINK_DOWN:
2404                         if (slave->link_failure_count < UINT_MAX)
2405                                 slave->link_failure_count++;
2406
2407                         slave->link = BOND_LINK_DOWN;
2408
2409                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2410                             bond->params.mode == BOND_MODE_8023AD)
2411                                 bond_set_slave_inactive_flags(slave);
2412
2413                         printk(KERN_INFO DRV_NAME
2414                                ": %s: link status definitely down for "
2415                                "interface %s, disabling it\n",
2416                                bond->dev->name, slave->dev->name);
2417
2418                         if (bond->params.mode == BOND_MODE_8023AD)
2419                                 bond_3ad_handle_link_change(slave,
2420                                                             BOND_LINK_DOWN);
2421
2422                         if (bond->params.mode == BOND_MODE_TLB ||
2423                             bond->params.mode == BOND_MODE_ALB)
2424                                 bond_alb_handle_link_change(bond, slave,
2425                                                             BOND_LINK_DOWN);
2426
2427                         if (slave == bond->curr_active_slave)
2428                                 goto do_failover;
2429
2430                         continue;
2431
2432                 default:
2433                         printk(KERN_ERR DRV_NAME
2434                                ": %s: invalid new link %d on slave %s\n",
2435                                bond->dev->name, slave->new_link,
2436                                slave->dev->name);
2437                         slave->new_link = BOND_LINK_NOCHANGE;
2438
2439                         continue;
2440                 }
2441
2442 do_failover:
2443                 ASSERT_RTNL();
2444                 write_lock_bh(&bond->curr_slave_lock);
2445                 bond_select_active_slave(bond);
2446                 write_unlock_bh(&bond->curr_slave_lock);
2447         }
2448
2449         bond_set_carrier(bond);
2450 }
2451
2452 /*
2453  * bond_mii_monitor
2454  *
2455  * Really a wrapper that splits the mii monitor into two phases: an
2456  * inspection, then (if inspection indicates something needs to be done)
2457  * an acquisition of appropriate locks followed by a commit phase to
2458  * implement whatever link state changes are indicated.
2459  */
2460 void bond_mii_monitor(struct work_struct *work)
2461 {
2462         struct bonding *bond = container_of(work, struct bonding,
2463                                             mii_work.work);
2464
2465         read_lock(&bond->lock);
2466         if (bond->kill_timers)
2467                 goto out;
2468
2469         if (bond->slave_cnt == 0)
2470                 goto re_arm;
2471
2472         if (bond->send_grat_arp) {
2473                 read_lock(&bond->curr_slave_lock);
2474                 bond_send_gratuitous_arp(bond);
2475                 read_unlock(&bond->curr_slave_lock);
2476         }
2477
2478         if (bond->send_unsol_na) {
2479                 read_lock(&bond->curr_slave_lock);
2480                 bond_send_unsolicited_na(bond);
2481                 read_unlock(&bond->curr_slave_lock);
2482         }
2483
2484         if (bond_miimon_inspect(bond)) {
2485                 read_unlock(&bond->lock);
2486                 rtnl_lock();
2487                 read_lock(&bond->lock);
2488
2489                 bond_miimon_commit(bond);
2490
2491                 read_unlock(&bond->lock);
2492                 rtnl_unlock();  /* might sleep, hold no other locks */
2493                 read_lock(&bond->lock);
2494         }
2495
2496 re_arm:
2497         if (bond->params.miimon)
2498                 queue_delayed_work(bond->wq, &bond->mii_work,
2499                                    msecs_to_jiffies(bond->params.miimon));
2500 out:
2501         read_unlock(&bond->lock);
2502 }
2503
2504 static __be32 bond_glean_dev_ip(struct net_device *dev)
2505 {
2506         struct in_device *idev;
2507         struct in_ifaddr *ifa;
2508         __be32 addr = 0;
2509
2510         if (!dev)
2511                 return 0;
2512
2513         rcu_read_lock();
2514         idev = __in_dev_get_rcu(dev);
2515         if (!idev)
2516                 goto out;
2517
2518         ifa = idev->ifa_list;
2519         if (!ifa)
2520                 goto out;
2521
2522         addr = ifa->ifa_local;
2523 out:
2524         rcu_read_unlock();
2525         return addr;
2526 }
2527
2528 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2529 {
2530         struct vlan_entry *vlan;
2531
2532         if (ip == bond->master_ip)
2533                 return 1;
2534
2535         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2536                 if (ip == vlan->vlan_ip)
2537                         return 1;
2538         }
2539
2540         return 0;
2541 }
2542
2543 /*
2544  * We go to the (large) trouble of VLAN tagging ARP frames because
2545  * switches in VLAN mode (especially if ports are configured as
2546  * "native" to a VLAN) might not pass non-tagged frames.
2547  */
2548 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2549 {
2550         struct sk_buff *skb;
2551
2552         dprintk("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2553                slave_dev->name, dest_ip, src_ip, vlan_id);
2554                
2555         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2556                          NULL, slave_dev->dev_addr, NULL);
2557
2558         if (!skb) {
2559                 printk(KERN_ERR DRV_NAME ": ARP packet allocation failed\n");
2560                 return;
2561         }
2562         if (vlan_id) {
2563                 skb = vlan_put_tag(skb, vlan_id);
2564                 if (!skb) {
2565                         printk(KERN_ERR DRV_NAME ": failed to insert VLAN tag\n");
2566                         return;
2567                 }
2568         }
2569         arp_xmit(skb);
2570 }
2571
2572
2573 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2574 {
2575         int i, vlan_id, rv;
2576         __be32 *targets = bond->params.arp_targets;
2577         struct vlan_entry *vlan;
2578         struct net_device *vlan_dev;
2579         struct flowi fl;
2580         struct rtable *rt;
2581
2582         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2583                 if (!targets[i])
2584                         continue;
2585                 dprintk("basa: target %x\n", targets[i]);
2586                 if (list_empty(&bond->vlan_list)) {
2587                         dprintk("basa: empty vlan: arp_send\n");
2588                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2589                                       bond->master_ip, 0);
2590                         continue;
2591                 }
2592
2593                 /*
2594                  * If VLANs are configured, we do a route lookup to
2595                  * determine which VLAN interface would be used, so we
2596                  * can tag the ARP with the proper VLAN tag.
2597                  */
2598                 memset(&fl, 0, sizeof(fl));
2599                 fl.fl4_dst = targets[i];
2600                 fl.fl4_tos = RTO_ONLINK;
2601
2602                 rv = ip_route_output_key(&init_net, &rt, &fl);
2603                 if (rv) {
2604                         if (net_ratelimit()) {
2605                                 printk(KERN_WARNING DRV_NAME
2606                              ": %s: no route to arp_ip_target %pI4\n",
2607                                        bond->dev->name, &fl.fl4_dst);
2608                         }
2609                         continue;
2610                 }
2611
2612                 /*
2613                  * This target is not on a VLAN
2614                  */
2615                 if (rt->u.dst.dev == bond->dev) {
2616                         ip_rt_put(rt);
2617                         dprintk("basa: rtdev == bond->dev: arp_send\n");
2618                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2619                                       bond->master_ip, 0);
2620                         continue;
2621                 }
2622
2623                 vlan_id = 0;
2624                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2625                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2626                         if (vlan_dev == rt->u.dst.dev) {
2627                                 vlan_id = vlan->vlan_id;
2628                                 dprintk("basa: vlan match on %s %d\n",
2629                                        vlan_dev->name, vlan_id);
2630                                 break;
2631                         }
2632                 }
2633
2634                 if (vlan_id) {
2635                         ip_rt_put(rt);
2636                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2637                                       vlan->vlan_ip, vlan_id);
2638                         continue;
2639                 }
2640
2641                 if (net_ratelimit()) {
2642                         printk(KERN_WARNING DRV_NAME
2643                ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2644                                bond->dev->name, &fl.fl4_dst,
2645                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2646                 }
2647                 ip_rt_put(rt);
2648         }
2649 }
2650
2651 /*
2652  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2653  * for each VLAN above us.
2654  *
2655  * Caller must hold curr_slave_lock for read or better
2656  */
2657 static void bond_send_gratuitous_arp(struct bonding *bond)
2658 {
2659         struct slave *slave = bond->curr_active_slave;
2660         struct vlan_entry *vlan;
2661         struct net_device *vlan_dev;
2662
2663         dprintk("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2664                                 slave ? slave->dev->name : "NULL");
2665
2666         if (!slave || !bond->send_grat_arp ||
2667             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2668                 return;
2669
2670         bond->send_grat_arp--;
2671
2672         if (bond->master_ip) {
2673                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2674                                 bond->master_ip, 0);
2675         }
2676
2677         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2678                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2679                 if (vlan->vlan_ip) {
2680                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2681                                       vlan->vlan_ip, vlan->vlan_id);
2682                 }
2683         }
2684 }
2685
2686 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2687 {
2688         int i;
2689         __be32 *targets = bond->params.arp_targets;
2690
2691         targets = bond->params.arp_targets;
2692         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2693                 dprintk("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2694                         &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2695                 if (sip == targets[i]) {
2696                         if (bond_has_this_ip(bond, tip))
2697                                 slave->last_arp_rx = jiffies;
2698                         return;
2699                 }
2700         }
2701 }
2702
2703 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2704 {
2705         struct arphdr *arp;
2706         struct slave *slave;
2707         struct bonding *bond;
2708         unsigned char *arp_ptr;
2709         __be32 sip, tip;
2710
2711         if (dev_net(dev) != &init_net)
2712                 goto out;
2713
2714         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2715                 goto out;
2716
2717         bond = netdev_priv(dev);
2718         read_lock(&bond->lock);
2719
2720         dprintk("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2721                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2722                 orig_dev ? orig_dev->name : "NULL");
2723
2724         slave = bond_get_slave_by_dev(bond, orig_dev);
2725         if (!slave || !slave_do_arp_validate(bond, slave))
2726                 goto out_unlock;
2727
2728         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2729                 goto out_unlock;
2730
2731         arp = arp_hdr(skb);
2732         if (arp->ar_hln != dev->addr_len ||
2733             skb->pkt_type == PACKET_OTHERHOST ||
2734             skb->pkt_type == PACKET_LOOPBACK ||
2735             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2736             arp->ar_pro != htons(ETH_P_IP) ||
2737             arp->ar_pln != 4)
2738                 goto out_unlock;
2739
2740         arp_ptr = (unsigned char *)(arp + 1);
2741         arp_ptr += dev->addr_len;
2742         memcpy(&sip, arp_ptr, 4);
2743         arp_ptr += 4 + dev->addr_len;
2744         memcpy(&tip, arp_ptr, 4);
2745
2746         dprintk("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2747                 bond->dev->name, slave->dev->name, slave->state,
2748                 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2749                 &sip, &tip);
2750
2751         /*
2752          * Backup slaves won't see the ARP reply, but do come through
2753          * here for each ARP probe (so we swap the sip/tip to validate
2754          * the probe).  In a "redundant switch, common router" type of
2755          * configuration, the ARP probe will (hopefully) travel from
2756          * the active, through one switch, the router, then the other
2757          * switch before reaching the backup.
2758          */
2759         if (slave->state == BOND_STATE_ACTIVE)
2760                 bond_validate_arp(bond, slave, sip, tip);
2761         else
2762                 bond_validate_arp(bond, slave, tip, sip);
2763
2764 out_unlock:
2765         read_unlock(&bond->lock);
2766 out:
2767         dev_kfree_skb(skb);
2768         return NET_RX_SUCCESS;
2769 }
2770
2771 /*
2772  * this function is called regularly to monitor each slave's link
2773  * ensuring that traffic is being sent and received when arp monitoring
2774  * is used in load-balancing mode. if the adapter has been dormant, then an
2775  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2776  * arp monitoring in active backup mode.
2777  */
2778 void bond_loadbalance_arp_mon(struct work_struct *work)
2779 {
2780         struct bonding *bond = container_of(work, struct bonding,
2781                                             arp_work.work);
2782         struct slave *slave, *oldcurrent;
2783         int do_failover = 0;
2784         int delta_in_ticks;
2785         int i;
2786
2787         read_lock(&bond->lock);
2788
2789         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2790
2791         if (bond->kill_timers) {
2792                 goto out;
2793         }
2794
2795         if (bond->slave_cnt == 0) {
2796                 goto re_arm;
2797         }
2798
2799         read_lock(&bond->curr_slave_lock);
2800         oldcurrent = bond->curr_active_slave;
2801         read_unlock(&bond->curr_slave_lock);
2802
2803         /* see if any of the previous devices are up now (i.e. they have
2804          * xmt and rcv traffic). the curr_active_slave does not come into
2805          * the picture unless it is null. also, slave->jiffies is not needed
2806          * here because we send an arp on each slave and give a slave as
2807          * long as it needs to get the tx/rx within the delta.
2808          * TODO: what about up/down delay in arp mode? it wasn't here before
2809          *       so it can wait
2810          */
2811         bond_for_each_slave(bond, slave, i) {
2812                 if (slave->link != BOND_LINK_UP) {
2813                         if (time_before_eq(jiffies, slave->dev->trans_start + delta_in_ticks) &&
2814                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2815
2816                                 slave->link  = BOND_LINK_UP;
2817                                 slave->state = BOND_STATE_ACTIVE;
2818
2819                                 /* primary_slave has no meaning in round-robin
2820                                  * mode. the window of a slave being up and
2821                                  * curr_active_slave being null after enslaving
2822                                  * is closed.
2823                                  */
2824                                 if (!oldcurrent) {
2825                                         printk(KERN_INFO DRV_NAME
2826                                                ": %s: link status definitely "
2827                                                "up for interface %s, ",
2828                                                bond->dev->name,
2829                                                slave->dev->name);
2830                                         do_failover = 1;
2831                                 } else {
2832                                         printk(KERN_INFO DRV_NAME
2833                                                ": %s: interface %s is now up\n",
2834                                                bond->dev->name,
2835                                                slave->dev->name);
2836                                 }
2837                         }
2838                 } else {
2839                         /* slave->link == BOND_LINK_UP */
2840
2841                         /* not all switches will respond to an arp request
2842                          * when the source ip is 0, so don't take the link down
2843                          * if we don't know our ip yet
2844                          */
2845                         if (time_after_eq(jiffies, slave->dev->trans_start + 2*delta_in_ticks) ||
2846                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2847
2848                                 slave->link  = BOND_LINK_DOWN;
2849                                 slave->state = BOND_STATE_BACKUP;
2850
2851                                 if (slave->link_failure_count < UINT_MAX) {
2852                                         slave->link_failure_count++;
2853                                 }
2854
2855                                 printk(KERN_INFO DRV_NAME
2856                                        ": %s: interface %s is now down.\n",
2857                                        bond->dev->name,
2858                                        slave->dev->name);
2859
2860                                 if (slave == oldcurrent) {
2861                                         do_failover = 1;
2862                                 }
2863                         }
2864                 }
2865
2866                 /* note: if switch is in round-robin mode, all links
2867                  * must tx arp to ensure all links rx an arp - otherwise
2868                  * links may oscillate or not come up at all; if switch is
2869                  * in something like xor mode, there is nothing we can
2870                  * do - all replies will be rx'ed on same link causing slaves
2871                  * to be unstable during low/no traffic periods
2872                  */
2873                 if (IS_UP(slave->dev)) {
2874                         bond_arp_send_all(bond, slave);
2875                 }
2876         }
2877
2878         if (do_failover) {
2879                 write_lock_bh(&bond->curr_slave_lock);
2880
2881                 bond_select_active_slave(bond);
2882
2883                 write_unlock_bh(&bond->curr_slave_lock);
2884         }
2885
2886 re_arm:
2887         if (bond->params.arp_interval)
2888                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2889 out:
2890         read_unlock(&bond->lock);
2891 }
2892
2893 /*
2894  * Called to inspect slaves for active-backup mode ARP monitor link state
2895  * changes.  Sets new_link in slaves to specify what action should take
2896  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2897  * to link states must be committed.
2898  *
2899  * Called with bond->lock held for read.
2900  */
2901 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2902 {
2903         struct slave *slave;
2904         int i, commit = 0;
2905
2906         bond_for_each_slave(bond, slave, i) {
2907                 slave->new_link = BOND_LINK_NOCHANGE;
2908
2909                 if (slave->link != BOND_LINK_UP) {
2910                         if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2911                                            delta_in_ticks)) {
2912                                 slave->new_link = BOND_LINK_UP;
2913                                 commit++;
2914                         }
2915
2916                         continue;
2917                 }
2918
2919                 /*
2920                  * Give slaves 2*delta after being enslaved or made
2921                  * active.  This avoids bouncing, as the last receive
2922                  * times need a full ARP monitor cycle to be updated.
2923                  */
2924                 if (!time_after_eq(jiffies, slave->jiffies +
2925                                    2 * delta_in_ticks))
2926                         continue;
2927
2928                 /*
2929                  * Backup slave is down if:
2930                  * - No current_arp_slave AND
2931                  * - more than 3*delta since last receive AND
2932                  * - the bond has an IP address
2933                  *
2934                  * Note: a non-null current_arp_slave indicates
2935                  * the curr_active_slave went down and we are
2936                  * searching for a new one; under this condition
2937                  * we only take the curr_active_slave down - this
2938                  * gives each slave a chance to tx/rx traffic
2939                  * before being taken out
2940                  */
2941                 if (slave->state == BOND_STATE_BACKUP &&
2942                     !bond->current_arp_slave &&
2943                     time_after(jiffies, slave_last_rx(bond, slave) +
2944                                3 * delta_in_ticks)) {
2945                         slave->new_link = BOND_LINK_DOWN;
2946                         commit++;
2947                 }
2948
2949                 /*
2950                  * Active slave is down if:
2951                  * - more than 2*delta since transmitting OR
2952                  * - (more than 2*delta since receive AND
2953                  *    the bond has an IP address)
2954                  */
2955                 if ((slave->state == BOND_STATE_ACTIVE) &&
2956                     (time_after_eq(jiffies, slave->dev->trans_start +
2957                                     2 * delta_in_ticks) ||
2958                       (time_after_eq(jiffies, slave_last_rx(bond, slave)
2959                                      + 2 * delta_in_ticks)))) {
2960                         slave->new_link = BOND_LINK_DOWN;
2961                         commit++;
2962                 }
2963         }
2964
2965         read_lock(&bond->curr_slave_lock);
2966
2967         /*
2968          * Trigger a commit if the primary option setting has changed.
2969          */
2970         if (bond->primary_slave &&
2971             (bond->primary_slave != bond->curr_active_slave) &&
2972             (bond->primary_slave->link == BOND_LINK_UP))
2973                 commit++;
2974
2975         read_unlock(&bond->curr_slave_lock);
2976
2977         return commit;
2978 }
2979
2980 /*
2981  * Called to commit link state changes noted by inspection step of
2982  * active-backup mode ARP monitor.
2983  *
2984  * Called with RTNL and bond->lock for read.
2985  */
2986 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2987 {
2988         struct slave *slave;
2989         int i;
2990
2991         bond_for_each_slave(bond, slave, i) {
2992                 switch (slave->new_link) {
2993                 case BOND_LINK_NOCHANGE:
2994                         continue;
2995
2996                 case BOND_LINK_UP:
2997                         write_lock_bh(&bond->curr_slave_lock);
2998
2999                         if (!bond->curr_active_slave &&
3000                             time_before_eq(jiffies, slave->dev->trans_start +
3001                                            delta_in_ticks)) {
3002                                 slave->link = BOND_LINK_UP;
3003                                 bond_change_active_slave(bond, slave);
3004                                 bond->current_arp_slave = NULL;
3005
3006                                 printk(KERN_INFO DRV_NAME
3007                                        ": %s: %s is up and now the "
3008                                        "active interface\n",
3009                                        bond->dev->name, slave->dev->name);
3010
3011                         } else if (bond->curr_active_slave != slave) {
3012                                 /* this slave has just come up but we
3013                                  * already have a current slave; this can
3014                                  * also happen if bond_enslave adds a new
3015                                  * slave that is up while we are searching
3016                                  * for a new slave
3017                                  */
3018                                 slave->link = BOND_LINK_UP;
3019                                 bond_set_slave_inactive_flags(slave);
3020                                 bond->current_arp_slave = NULL;
3021
3022                                 printk(KERN_INFO DRV_NAME
3023                                        ": %s: backup interface %s is now up\n",
3024                                        bond->dev->name, slave->dev->name);
3025                         }
3026
3027                         write_unlock_bh(&bond->curr_slave_lock);
3028
3029                         break;
3030
3031                 case BOND_LINK_DOWN:
3032                         if (slave->link_failure_count < UINT_MAX)
3033                                 slave->link_failure_count++;
3034
3035                         slave->link = BOND_LINK_DOWN;
3036
3037                         if (slave == bond->curr_active_slave) {
3038                                 printk(KERN_INFO DRV_NAME
3039                                        ": %s: link status down for active "
3040                                        "interface %s, disabling it\n",
3041                                        bond->dev->name, slave->dev->name);
3042
3043                                 bond_set_slave_inactive_flags(slave);
3044
3045                                 write_lock_bh(&bond->curr_slave_lock);
3046
3047                                 bond_select_active_slave(bond);
3048                                 if (bond->curr_active_slave)
3049                                         bond->curr_active_slave->jiffies =
3050                                                 jiffies;
3051
3052                                 write_unlock_bh(&bond->curr_slave_lock);
3053
3054                                 bond->current_arp_slave = NULL;
3055
3056                         } else if (slave->state == BOND_STATE_BACKUP) {
3057                                 printk(KERN_INFO DRV_NAME
3058                                        ": %s: backup interface %s is now down\n",
3059                                        bond->dev->name, slave->dev->name);
3060
3061                                 bond_set_slave_inactive_flags(slave);
3062                         }
3063                         break;
3064
3065                 default:
3066                         printk(KERN_ERR DRV_NAME
3067                                ": %s: impossible: new_link %d on slave %s\n",
3068                                bond->dev->name, slave->new_link,
3069                                slave->dev->name);
3070                 }
3071         }
3072
3073         /*
3074          * No race with changes to primary via sysfs, as we hold rtnl.
3075          */
3076         if (bond->primary_slave &&
3077             (bond->primary_slave != bond->curr_active_slave) &&
3078             (bond->primary_slave->link == BOND_LINK_UP)) {
3079                 write_lock_bh(&bond->curr_slave_lock);
3080                 bond_change_active_slave(bond, bond->primary_slave);
3081                 write_unlock_bh(&bond->curr_slave_lock);
3082         }
3083
3084         bond_set_carrier(bond);
3085 }
3086
3087 /*
3088  * Send ARP probes for active-backup mode ARP monitor.
3089  *
3090  * Called with bond->lock held for read.
3091  */
3092 static void bond_ab_arp_probe(struct bonding *bond)
3093 {
3094         struct slave *slave;
3095         int i;
3096
3097         read_lock(&bond->curr_slave_lock);
3098
3099         if (bond->current_arp_slave && bond->curr_active_slave)
3100                 printk("PROBE: c_arp %s && cas %s BAD\n",
3101                        bond->current_arp_slave->dev->name,
3102                        bond->curr_active_slave->dev->name);
3103
3104         if (bond->curr_active_slave) {
3105                 bond_arp_send_all(bond, bond->curr_active_slave);
3106                 read_unlock(&bond->curr_slave_lock);
3107                 return;
3108         }
3109
3110         read_unlock(&bond->curr_slave_lock);
3111
3112         /* if we don't have a curr_active_slave, search for the next available
3113          * backup slave from the current_arp_slave and make it the candidate
3114          * for becoming the curr_active_slave
3115          */
3116
3117         if (!bond->current_arp_slave) {
3118                 bond->current_arp_slave = bond->first_slave;
3119                 if (!bond->current_arp_slave)
3120                         return;
3121         }
3122
3123         bond_set_slave_inactive_flags(bond->current_arp_slave);
3124
3125         /* search for next candidate */
3126         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3127                 if (IS_UP(slave->dev)) {
3128                         slave->link = BOND_LINK_BACK;
3129                         bond_set_slave_active_flags(slave);
3130                         bond_arp_send_all(bond, slave);
3131                         slave->jiffies = jiffies;
3132                         bond->current_arp_slave = slave;
3133                         break;
3134                 }
3135
3136                 /* if the link state is up at this point, we
3137                  * mark it down - this can happen if we have
3138                  * simultaneous link failures and
3139                  * reselect_active_interface doesn't make this
3140                  * one the current slave so it is still marked
3141                  * up when it is actually down
3142                  */
3143                 if (slave->link == BOND_LINK_UP) {
3144                         slave->link = BOND_LINK_DOWN;
3145                         if (slave->link_failure_count < UINT_MAX)
3146                                 slave->link_failure_count++;
3147
3148                         bond_set_slave_inactive_flags(slave);
3149
3150                         printk(KERN_INFO DRV_NAME
3151                                ": %s: backup interface %s is now down.\n",
3152                                bond->dev->name, slave->dev->name);
3153                 }
3154         }
3155 }
3156
3157 void bond_activebackup_arp_mon(struct work_struct *work)
3158 {
3159         struct bonding *bond = container_of(work, struct bonding,
3160                                             arp_work.work);
3161         int delta_in_ticks;
3162
3163         read_lock(&bond->lock);
3164
3165         if (bond->kill_timers)
3166                 goto out;
3167
3168         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3169
3170         if (bond->slave_cnt == 0)
3171                 goto re_arm;
3172
3173         if (bond->send_grat_arp) {
3174                 read_lock(&bond->curr_slave_lock);
3175                 bond_send_gratuitous_arp(bond);
3176                 read_unlock(&bond->curr_slave_lock);
3177         }
3178
3179         if (bond->send_unsol_na) {
3180                 read_lock(&bond->curr_slave_lock);
3181                 bond_send_unsolicited_na(bond);
3182                 read_unlock(&bond->curr_slave_lock);
3183         }
3184
3185         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3186                 read_unlock(&bond->lock);
3187                 rtnl_lock();
3188                 read_lock(&bond->lock);
3189
3190                 bond_ab_arp_commit(bond, delta_in_ticks);
3191
3192                 read_unlock(&bond->lock);
3193                 rtnl_unlock();
3194                 read_lock(&bond->lock);
3195         }
3196
3197         bond_ab_arp_probe(bond);
3198
3199 re_arm:
3200         if (bond->params.arp_interval) {
3201                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3202         }
3203 out:
3204         read_unlock(&bond->lock);
3205 }
3206
3207 /*------------------------------ proc/seq_file-------------------------------*/
3208
3209 #ifdef CONFIG_PROC_FS
3210
3211 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3212 {
3213         struct bonding *bond = seq->private;
3214         loff_t off = 0;
3215         struct slave *slave;
3216         int i;
3217
3218         /* make sure the bond won't be taken away */
3219         read_lock(&dev_base_lock);
3220         read_lock(&bond->lock);
3221
3222         if (*pos == 0) {
3223                 return SEQ_START_TOKEN;
3224         }
3225
3226         bond_for_each_slave(bond, slave, i) {
3227                 if (++off == *pos) {
3228                         return slave;
3229                 }
3230         }
3231
3232         return NULL;
3233 }
3234
3235 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3236 {
3237         struct bonding *bond = seq->private;
3238         struct slave *slave = v;
3239
3240         ++*pos;
3241         if (v == SEQ_START_TOKEN) {
3242                 return bond->first_slave;
3243         }
3244
3245         slave = slave->next;
3246
3247         return (slave == bond->first_slave) ? NULL : slave;
3248 }
3249
3250 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3251 {
3252         struct bonding *bond = seq->private;
3253
3254         read_unlock(&bond->lock);
3255         read_unlock(&dev_base_lock);
3256 }
3257
3258 static void bond_info_show_master(struct seq_file *seq)
3259 {
3260         struct bonding *bond = seq->private;
3261         struct slave *curr;
3262         int i;
3263
3264         read_lock(&bond->curr_slave_lock);
3265         curr = bond->curr_active_slave;
3266         read_unlock(&bond->curr_slave_lock);
3267
3268         seq_printf(seq, "Bonding Mode: %s",
3269                    bond_mode_name(bond->params.mode));
3270
3271         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3272             bond->params.fail_over_mac)
3273                 seq_printf(seq, " (fail_over_mac %s)",
3274                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3275
3276         seq_printf(seq, "\n");
3277
3278         if (bond->params.mode == BOND_MODE_XOR ||
3279                 bond->params.mode == BOND_MODE_8023AD) {
3280                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3281                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3282                         bond->params.xmit_policy);
3283         }
3284
3285         if (USES_PRIMARY(bond->params.mode)) {
3286                 seq_printf(seq, "Primary Slave: %s\n",
3287                            (bond->primary_slave) ?
3288                            bond->primary_slave->dev->name : "None");
3289
3290                 seq_printf(seq, "Currently Active Slave: %s\n",
3291                            (curr) ? curr->dev->name : "None");
3292         }
3293
3294         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3295                    "up" : "down");
3296         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3297         seq_printf(seq, "Up Delay (ms): %d\n",
3298                    bond->params.updelay * bond->params.miimon);
3299         seq_printf(seq, "Down Delay (ms): %d\n",
3300                    bond->params.downdelay * bond->params.miimon);
3301
3302
3303         /* ARP information */
3304         if(bond->params.arp_interval > 0) {
3305                 int printed=0;
3306                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3307                                 bond->params.arp_interval);
3308
3309                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3310
3311                 for(i = 0; (i < BOND_MAX_ARP_TARGETS) ;i++) {
3312                         if (!bond->params.arp_targets[i])
3313                                 continue;
3314                         if (printed)
3315                                 seq_printf(seq, ",");
3316                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3317                         printed = 1;
3318                 }
3319                 seq_printf(seq, "\n");
3320         }
3321
3322         if (bond->params.mode == BOND_MODE_8023AD) {
3323                 struct ad_info ad_info;
3324
3325                 seq_puts(seq, "\n802.3ad info\n");
3326                 seq_printf(seq, "LACP rate: %s\n",
3327                            (bond->params.lacp_fast) ? "fast" : "slow");
3328                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3329                            ad_select_tbl[bond->params.ad_select].modename);
3330
3331                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3332                         seq_printf(seq, "bond %s has no active aggregator\n",
3333                                    bond->dev->name);
3334                 } else {
3335                         seq_printf(seq, "Active Aggregator Info:\n");
3336
3337                         seq_printf(seq, "\tAggregator ID: %d\n",
3338                                    ad_info.aggregator_id);
3339                         seq_printf(seq, "\tNumber of ports: %d\n",
3340                                    ad_info.ports);
3341                         seq_printf(seq, "\tActor Key: %d\n",
3342                                    ad_info.actor_key);
3343                         seq_printf(seq, "\tPartner Key: %d\n",
3344                                    ad_info.partner_key);
3345                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3346                                    ad_info.partner_system);
3347                 }
3348         }
3349 }
3350
3351 static void bond_info_show_slave(struct seq_file *seq, const struct slave *slave)
3352 {
3353         struct bonding *bond = seq->private;
3354
3355         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3356         seq_printf(seq, "MII Status: %s\n",
3357                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3358         seq_printf(seq, "Link Failure Count: %u\n",
3359                    slave->link_failure_count);
3360
3361         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3362
3363         if (bond->params.mode == BOND_MODE_8023AD) {
3364                 const struct aggregator *agg
3365                         = SLAVE_AD_INFO(slave).port.aggregator;
3366
3367                 if (agg) {
3368                         seq_printf(seq, "Aggregator ID: %d\n",
3369                                    agg->aggregator_identifier);
3370                 } else {
3371                         seq_puts(seq, "Aggregator ID: N/A\n");
3372                 }
3373         }
3374 }
3375
3376 static int bond_info_seq_show(struct seq_file *seq, void *v)
3377 {
3378         if (v == SEQ_START_TOKEN) {
3379                 seq_printf(seq, "%s\n", version);
3380                 bond_info_show_master(seq);
3381         } else {
3382                 bond_info_show_slave(seq, v);
3383         }
3384
3385         return 0;
3386 }
3387
3388 static struct seq_operations bond_info_seq_ops = {
3389         .start = bond_info_seq_start,
3390         .next  = bond_info_seq_next,
3391         .stop  = bond_info_seq_stop,
3392         .show  = bond_info_seq_show,
3393 };
3394
3395 static int bond_info_open(struct inode *inode, struct file *file)
3396 {
3397         struct seq_file *seq;
3398         struct proc_dir_entry *proc;
3399         int res;
3400
3401         res = seq_open(file, &bond_info_seq_ops);
3402         if (!res) {
3403                 /* recover the pointer buried in proc_dir_entry data */
3404                 seq = file->private_data;
3405                 proc = PDE(inode);
3406                 seq->private = proc->data;
3407         }
3408
3409         return res;
3410 }
3411
3412 static const struct file_operations bond_info_fops = {
3413         .owner   = THIS_MODULE,
3414         .open    = bond_info_open,
3415         .read    = seq_read,
3416         .llseek  = seq_lseek,
3417         .release = seq_release,
3418 };
3419
3420 static int bond_create_proc_entry(struct bonding *bond)
3421 {
3422         struct net_device *bond_dev = bond->dev;
3423
3424         if (bond_proc_dir) {
3425                 bond->proc_entry = proc_create_data(bond_dev->name,
3426                                                     S_IRUGO, bond_proc_dir,
3427                                                     &bond_info_fops, bond);
3428                 if (bond->proc_entry == NULL) {
3429                         printk(KERN_WARNING DRV_NAME
3430                                ": Warning: Cannot create /proc/net/%s/%s\n",
3431                                DRV_NAME, bond_dev->name);
3432                 } else {
3433                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3434                 }
3435         }
3436
3437         return 0;
3438 }
3439
3440 static void bond_remove_proc_entry(struct bonding *bond)
3441 {
3442         if (bond_proc_dir && bond->proc_entry) {
3443                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3444                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3445                 bond->proc_entry = NULL;
3446         }
3447 }
3448
3449 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3450  * Caller must hold rtnl_lock.
3451  */
3452 static void bond_create_proc_dir(void)
3453 {
3454         int len = strlen(DRV_NAME);
3455
3456         for (bond_proc_dir = init_net.proc_net->subdir; bond_proc_dir;
3457              bond_proc_dir = bond_proc_dir->next) {
3458                 if ((bond_proc_dir->namelen == len) &&
3459                     !memcmp(bond_proc_dir->name, DRV_NAME, len)) {
3460                         break;
3461                 }
3462         }
3463
3464         if (!bond_proc_dir) {
3465                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3466                 if (bond_proc_dir) {
3467                         bond_proc_dir->owner = THIS_MODULE;
3468                 } else {
3469                         printk(KERN_WARNING DRV_NAME
3470                                 ": Warning: cannot create /proc/net/%s\n",
3471                                 DRV_NAME);
3472                 }
3473         }
3474 }
3475
3476 /* Destroy the bonding directory under /proc/net, if empty.
3477  * Caller must hold rtnl_lock.
3478  */
3479 static void bond_destroy_proc_dir(void)
3480 {
3481         struct proc_dir_entry *de;
3482
3483         if (!bond_proc_dir) {
3484                 return;
3485         }
3486
3487         /* verify that the /proc dir is empty */
3488         for (de = bond_proc_dir->subdir; de; de = de->next) {
3489                 /* ignore . and .. */
3490                 if (*(de->name) != '.') {
3491                         break;
3492                 }
3493         }
3494
3495         if (de) {
3496                 if (bond_proc_dir->owner == THIS_MODULE) {
3497                         bond_proc_dir->owner = NULL;
3498                 }
3499         } else {
3500                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3501                 bond_proc_dir = NULL;
3502         }
3503 }
3504 #endif /* CONFIG_PROC_FS */
3505
3506 /*-------------------------- netdev event handling --------------------------*/
3507
3508 /*
3509  * Change device name
3510  */
3511 static int bond_event_changename(struct bonding *bond)
3512 {
3513 #ifdef CONFIG_PROC_FS
3514         bond_remove_proc_entry(bond);
3515         bond_create_proc_entry(bond);
3516 #endif
3517         down_write(&(bonding_rwsem));
3518         bond_destroy_sysfs_entry(bond);
3519         bond_create_sysfs_entry(bond);
3520         up_write(&(bonding_rwsem));
3521         return NOTIFY_DONE;
3522 }
3523
3524 static int bond_master_netdev_event(unsigned long event, struct net_device *bond_dev)
3525 {
3526         struct bonding *event_bond = netdev_priv(bond_dev);
3527
3528         switch (event) {
3529         case NETDEV_CHANGENAME:
3530                 return bond_event_changename(event_bond);
3531         case NETDEV_UNREGISTER:
3532                 bond_release_all(event_bond->dev);
3533                 break;
3534         default:
3535                 break;
3536         }
3537
3538         return NOTIFY_DONE;
3539 }
3540
3541 static int bond_slave_netdev_event(unsigned long event, struct net_device *slave_dev)
3542 {
3543         struct net_device *bond_dev = slave_dev->master;
3544         struct bonding *bond = netdev_priv(bond_dev);
3545
3546         switch (event) {
3547         case NETDEV_UNREGISTER:
3548                 if (bond_dev) {
3549                         if (bond->setup_by_slave)
3550                                 bond_release_and_destroy(bond_dev, slave_dev);
3551                         else
3552                                 bond_release(bond_dev, slave_dev);
3553                 }
3554                 break;
3555         case NETDEV_CHANGE:
3556                 /*
3557                  * TODO: is this what we get if somebody
3558                  * sets up a hierarchical bond, then rmmod's
3559                  * one of the slave bonding devices?
3560                  */
3561                 break;
3562         case NETDEV_DOWN:
3563                 /*
3564                  * ... Or is it this?
3565                  */
3566                 break;
3567         case NETDEV_CHANGEMTU:
3568                 /*
3569                  * TODO: Should slaves be allowed to
3570                  * independently alter their MTU?  For
3571                  * an active-backup bond, slaves need
3572                  * not be the same type of device, so
3573                  * MTUs may vary.  For other modes,
3574                  * slaves arguably should have the
3575                  * same MTUs. To do this, we'd need to
3576                  * take over the slave's change_mtu
3577                  * function for the duration of their
3578                  * servitude.
3579                  */
3580                 break;
3581         case NETDEV_CHANGENAME:
3582                 /*
3583                  * TODO: handle changing the primary's name
3584                  */
3585                 break;
3586         case NETDEV_FEAT_CHANGE:
3587                 bond_compute_features(bond);
3588                 break;
3589         default:
3590                 break;
3591         }
3592
3593         return NOTIFY_DONE;
3594 }
3595
3596 /*
3597  * bond_netdev_event: handle netdev notifier chain events.
3598  *
3599  * This function receives events for the netdev chain.  The caller (an
3600  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3601  * locks for us to safely manipulate the slave devices (RTNL lock,
3602  * dev_probe_lock).
3603  */
3604 static int bond_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
3605 {
3606         struct net_device *event_dev = (struct net_device *)ptr;
3607
3608         if (dev_net(event_dev) != &init_net)
3609                 return NOTIFY_DONE;
3610
3611         dprintk("event_dev: %s, event: %lx\n",
3612                 (event_dev ? event_dev->name : "None"),
3613                 event);
3614
3615         if (!(event_dev->priv_flags & IFF_BONDING))
3616                 return NOTIFY_DONE;
3617
3618         if (event_dev->flags & IFF_MASTER) {
3619                 dprintk("IFF_MASTER\n");
3620                 return bond_master_netdev_event(event, event_dev);
3621         }
3622
3623         if (event_dev->flags & IFF_SLAVE) {
3624                 dprintk("IFF_SLAVE\n");
3625                 return bond_slave_netdev_event(event, event_dev);
3626         }
3627
3628         return NOTIFY_DONE;
3629 }
3630
3631 /*
3632  * bond_inetaddr_event: handle inetaddr notifier chain events.
3633  *
3634  * We keep track of device IPs primarily to use as source addresses in
3635  * ARP monitor probes (rather than spewing out broadcasts all the time).
3636  *
3637  * We track one IP for the main device (if it has one), plus one per VLAN.
3638  */
3639 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3640 {
3641         struct in_ifaddr *ifa = ptr;
3642         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3643         struct bonding *bond;
3644         struct vlan_entry *vlan;
3645
3646         if (dev_net(ifa->ifa_dev->dev) != &init_net)
3647                 return NOTIFY_DONE;
3648
3649         list_for_each_entry(bond, &bond_dev_list, bond_list) {
3650                 if (bond->dev == event_dev) {
3651                         switch (event) {
3652                         case NETDEV_UP:
3653                                 bond->master_ip = ifa->ifa_local;
3654                                 return NOTIFY_OK;
3655                         case NETDEV_DOWN:
3656                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3657                                 return NOTIFY_OK;
3658                         default:
3659                                 return NOTIFY_DONE;
3660                         }
3661                 }
3662
3663                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3664                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3665                         if (vlan_dev == event_dev) {
3666                                 switch (event) {
3667                                 case NETDEV_UP:
3668                                         vlan->vlan_ip = ifa->ifa_local;
3669                                         return NOTIFY_OK;
3670                                 case NETDEV_DOWN:
3671                                         vlan->vlan_ip =
3672                                                 bond_glean_dev_ip(vlan_dev);
3673                                         return NOTIFY_OK;
3674                                 default:
3675                                         return NOTIFY_DONE;
3676                                 }
3677                         }
3678                 }
3679         }
3680         return NOTIFY_DONE;
3681 }
3682
3683 static struct notifier_block bond_netdev_notifier = {
3684         .notifier_call = bond_netdev_event,
3685 };
3686
3687 static struct notifier_block bond_inetaddr_notifier = {
3688         .notifier_call = bond_inetaddr_event,
3689 };
3690
3691 /*-------------------------- Packet type handling ---------------------------*/
3692
3693 /* register to receive lacpdus on a bond */
3694 static void bond_register_lacpdu(struct bonding *bond)
3695 {
3696         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3697
3698         /* initialize packet type */
3699         pk_type->type = PKT_TYPE_LACPDU;
3700         pk_type->dev = bond->dev;
3701         pk_type->func = bond_3ad_lacpdu_recv;
3702
3703         dev_add_pack(pk_type);
3704 }
3705
3706 /* unregister to receive lacpdus on a bond */
3707 static void bond_unregister_lacpdu(struct bonding *bond)
3708 {
3709         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3710 }
3711
3712 void bond_register_arp(struct bonding *bond)
3713 {
3714         struct packet_type *pt = &bond->arp_mon_pt;
3715
3716         if (pt->type)
3717                 return;
3718
3719         pt->type = htons(ETH_P_ARP);
3720         pt->dev = bond->dev;
3721         pt->func = bond_arp_rcv;
3722         dev_add_pack(pt);
3723 }
3724
3725 void bond_unregister_arp(struct bonding *bond)
3726 {
3727         struct packet_type *pt = &bond->arp_mon_pt;
3728
3729         dev_remove_pack(pt);
3730         pt->type = 0;
3731 }
3732
3733 /*---------------------------- Hashing Policies -----------------------------*/
3734
3735 /*
3736  * Hash for the output device based upon layer 2 and layer 3 data. If
3737  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3738  */
3739 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3740                                      struct net_device *bond_dev, int count)
3741 {
3742         struct ethhdr *data = (struct ethhdr *)skb->data;
3743         struct iphdr *iph = ip_hdr(skb);
3744
3745         if (skb->protocol == htons(ETH_P_IP)) {
3746                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3747                         (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3748         }
3749
3750         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3751 }
3752
3753 /*
3754  * Hash for the output device based upon layer 3 and layer 4 data. If
3755  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3756  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3757  */
3758 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3759                                     struct net_device *bond_dev, int count)
3760 {
3761         struct ethhdr *data = (struct ethhdr *)skb->data;
3762         struct iphdr *iph = ip_hdr(skb);
3763         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3764         int layer4_xor = 0;
3765
3766         if (skb->protocol == htons(ETH_P_IP)) {
3767                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3768                     (iph->protocol == IPPROTO_TCP ||
3769                      iph->protocol == IPPROTO_UDP)) {
3770                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3771                 }
3772                 return (layer4_xor ^
3773                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3774
3775         }
3776
3777         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3778 }
3779
3780 /*
3781  * Hash for the output device based upon layer 2 data
3782  */
3783 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3784                                    struct net_device *bond_dev, int count)
3785 {
3786         struct ethhdr *data = (struct ethhdr *)skb->data;
3787
3788         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3789 }
3790
3791 /*-------------------------- Device entry points ----------------------------*/
3792
3793 static int bond_open(struct net_device *bond_dev)
3794 {
3795         struct bonding *bond = netdev_priv(bond_dev);
3796
3797         bond->kill_timers = 0;
3798
3799         if ((bond->params.mode == BOND_MODE_TLB) ||
3800             (bond->params.mode == BOND_MODE_ALB)) {
3801                 /* bond_alb_initialize must be called before the timer
3802                  * is started.
3803                  */
3804                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3805                         /* something went wrong - fail the open operation */
3806                         return -1;
3807                 }
3808
3809                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3810                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3811         }
3812
3813         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3814                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3815                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3816         }
3817
3818         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3819                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3820                         INIT_DELAYED_WORK(&bond->arp_work,
3821                                           bond_activebackup_arp_mon);
3822                 else
3823                         INIT_DELAYED_WORK(&bond->arp_work,
3824                                           bond_loadbalance_arp_mon);
3825
3826                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3827                 if (bond->params.arp_validate)
3828                         bond_register_arp(bond);
3829         }
3830
3831         if (bond->params.mode == BOND_MODE_8023AD) {
3832                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3833                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3834                 /* register to receive LACPDUs */
3835                 bond_register_lacpdu(bond);
3836                 bond_3ad_initiate_agg_selection(bond, 1);
3837         }
3838
3839         return 0;
3840 }
3841
3842 static int bond_close(struct net_device *bond_dev)
3843 {
3844         struct bonding *bond = netdev_priv(bond_dev);
3845
3846         if (bond->params.mode == BOND_MODE_8023AD) {
3847                 /* Unregister the receive of LACPDUs */
3848                 bond_unregister_lacpdu(bond);
3849         }
3850
3851         if (bond->params.arp_validate)
3852                 bond_unregister_arp(bond);
3853
3854         write_lock_bh(&bond->lock);
3855
3856         bond->send_grat_arp = 0;
3857         bond->send_unsol_na = 0;
3858
3859         /* signal timers not to re-arm */
3860         bond->kill_timers = 1;
3861
3862         write_unlock_bh(&bond->lock);
3863
3864         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3865                 cancel_delayed_work(&bond->mii_work);
3866         }
3867
3868         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3869                 cancel_delayed_work(&bond->arp_work);
3870         }
3871
3872         switch (bond->params.mode) {
3873         case BOND_MODE_8023AD:
3874                 cancel_delayed_work(&bond->ad_work);
3875                 break;
3876         case BOND_MODE_TLB:
3877         case BOND_MODE_ALB:
3878                 cancel_delayed_work(&bond->alb_work);
3879                 break;
3880         default:
3881                 break;
3882         }
3883
3884
3885         if ((bond->params.mode == BOND_MODE_TLB) ||
3886             (bond->params.mode == BOND_MODE_ALB)) {
3887                 /* Must be called only after all
3888                  * slaves have been released
3889                  */
3890                 bond_alb_deinitialize(bond);
3891         }
3892
3893         return 0;
3894 }
3895
3896 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3897 {
3898         struct bonding *bond = netdev_priv(bond_dev);
3899         struct net_device_stats *stats = &bond->stats;
3900         struct net_device_stats local_stats;
3901         struct slave *slave;
3902         int i;
3903
3904         memset(&local_stats, 0, sizeof(struct net_device_stats));
3905
3906         read_lock_bh(&bond->lock);
3907
3908         bond_for_each_slave(bond, slave, i) {
3909                 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3910
3911                 local_stats.rx_packets += sstats->rx_packets;
3912                 local_stats.rx_bytes += sstats->rx_bytes;
3913                 local_stats.rx_errors += sstats->rx_errors;
3914                 local_stats.rx_dropped += sstats->rx_dropped;
3915
3916                 local_stats.tx_packets += sstats->tx_packets;
3917                 local_stats.tx_bytes += sstats->tx_bytes;
3918                 local_stats.tx_errors += sstats->tx_errors;
3919                 local_stats.tx_dropped += sstats->tx_dropped;
3920
3921                 local_stats.multicast += sstats->multicast;
3922                 local_stats.collisions += sstats->collisions;
3923
3924                 local_stats.rx_length_errors += sstats->rx_length_errors;
3925                 local_stats.rx_over_errors += sstats->rx_over_errors;
3926                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3927                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3928                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3929                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3930
3931                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3932                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3933                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3934                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3935                 local_stats.tx_window_errors += sstats->tx_window_errors;
3936         }
3937
3938         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3939
3940         read_unlock_bh(&bond->lock);
3941
3942         return stats;
3943 }
3944
3945 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3946 {
3947         struct net_device *slave_dev = NULL;
3948         struct ifbond k_binfo;
3949         struct ifbond __user *u_binfo = NULL;
3950         struct ifslave k_sinfo;
3951         struct ifslave __user *u_sinfo = NULL;
3952         struct mii_ioctl_data *mii = NULL;
3953         int res = 0;
3954
3955         dprintk("bond_ioctl: master=%s, cmd=%d\n",
3956                 bond_dev->name, cmd);
3957
3958         switch (cmd) {
3959         case SIOCGMIIPHY:
3960                 mii = if_mii(ifr);
3961                 if (!mii) {
3962                         return -EINVAL;
3963                 }
3964                 mii->phy_id = 0;
3965                 /* Fall Through */
3966         case SIOCGMIIREG:
3967                 /*
3968                  * We do this again just in case we were called by SIOCGMIIREG
3969                  * instead of SIOCGMIIPHY.
3970                  */
3971                 mii = if_mii(ifr);
3972                 if (!mii) {
3973                         return -EINVAL;
3974                 }
3975
3976                 if (mii->reg_num == 1) {
3977                         struct bonding *bond = netdev_priv(bond_dev);
3978                         mii->val_out = 0;
3979                         read_lock(&bond->lock);
3980                         read_lock(&bond->curr_slave_lock);
3981                         if (netif_carrier_ok(bond->dev)) {
3982                                 mii->val_out = BMSR_LSTATUS;
3983                         }
3984                         read_unlock(&bond->curr_slave_lock);
3985                         read_unlock(&bond->lock);
3986                 }
3987
3988                 return 0;
3989         case BOND_INFO_QUERY_OLD:
3990         case SIOCBONDINFOQUERY:
3991                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3992
3993                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond))) {
3994                         return -EFAULT;
3995                 }
3996
3997                 res = bond_info_query(bond_dev, &k_binfo);
3998                 if (res == 0) {
3999                         if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond))) {
4000                                 return -EFAULT;
4001                         }
4002                 }
4003
4004                 return res;
4005         case BOND_SLAVE_INFO_QUERY_OLD:
4006         case SIOCBONDSLAVEINFOQUERY:
4007                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4008
4009                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave))) {
4010                         return -EFAULT;
4011                 }
4012
4013                 res = bond_slave_info_query(bond_dev, &k_sinfo);
4014                 if (res == 0) {
4015                         if (copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave))) {
4016                                 return -EFAULT;
4017                         }
4018                 }
4019
4020                 return res;
4021         default:
4022                 /* Go on */
4023                 break;
4024         }
4025
4026         if (!capable(CAP_NET_ADMIN)) {
4027                 return -EPERM;
4028         }
4029
4030         down_write(&(bonding_rwsem));
4031         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
4032
4033         dprintk("slave_dev=%p: \n", slave_dev);
4034
4035         if (!slave_dev) {
4036                 res = -ENODEV;
4037         } else {
4038                 dprintk("slave_dev->name=%s: \n", slave_dev->name);
4039                 switch (cmd) {
4040                 case BOND_ENSLAVE_OLD:
4041                 case SIOCBONDENSLAVE:
4042                         res = bond_enslave(bond_dev, slave_dev);
4043                         break;
4044                 case BOND_RELEASE_OLD:
4045                 case SIOCBONDRELEASE:
4046                         res = bond_release(bond_dev, slave_dev);
4047                         break;
4048                 case BOND_SETHWADDR_OLD:
4049                 case SIOCBONDSETHWADDR:
4050                         res = bond_sethwaddr(bond_dev, slave_dev);
4051                         break;
4052                 case BOND_CHANGE_ACTIVE_OLD:
4053                 case SIOCBONDCHANGEACTIVE:
4054                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4055                         break;
4056                 default:
4057                         res = -EOPNOTSUPP;
4058                 }
4059
4060                 dev_put(slave_dev);
4061         }
4062
4063         up_write(&(bonding_rwsem));
4064         return res;
4065 }
4066
4067 static void bond_set_multicast_list(struct net_device *bond_dev)
4068 {
4069         struct bonding *bond = netdev_priv(bond_dev);
4070         struct dev_mc_list *dmi;
4071
4072         /*
4073          * Do promisc before checking multicast_mode
4074          */
4075         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC)) {
4076                 /*
4077                  * FIXME: Need to handle the error when one of the multi-slaves
4078                  * encounters error.
4079                  */
4080                 bond_set_promiscuity(bond, 1);
4081         }
4082
4083         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC)) {
4084                 bond_set_promiscuity(bond, -1);
4085         }
4086
4087         /* set allmulti flag to slaves */
4088         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI)) {
4089                 /*
4090                  * FIXME: Need to handle the error when one of the multi-slaves
4091                  * encounters error.
4092                  */
4093                 bond_set_allmulti(bond, 1);
4094         }
4095
4096         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI)) {
4097                 bond_set_allmulti(bond, -1);
4098         }
4099
4100         read_lock(&bond->lock);
4101
4102         bond->flags = bond_dev->flags;
4103
4104         /* looking for addresses to add to slaves' mc list */
4105         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4106                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list)) {
4107                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4108                 }
4109         }
4110
4111         /* looking for addresses to delete from slaves' list */
4112         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4113                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list)) {
4114                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4115                 }
4116         }
4117
4118         /* save master's multicast list */
4119         bond_mc_list_destroy(bond);
4120         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4121
4122         read_unlock(&bond->lock);
4123 }
4124
4125 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4126 {
4127         struct bonding *bond = netdev_priv(dev);
4128         struct slave *slave = bond->first_slave;
4129
4130         if (slave) {
4131                 const struct net_device_ops *slave_ops
4132                         = slave->dev->netdev_ops;
4133                 if (slave_ops->ndo_neigh_setup)
4134                         return slave_ops->ndo_neigh_setup(dev, parms);
4135         }
4136         return 0;
4137 }
4138
4139 /*
4140  * Change the MTU of all of a master's slaves to match the master
4141  */
4142 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4143 {
4144         struct bonding *bond = netdev_priv(bond_dev);
4145         struct slave *slave, *stop_at;
4146         int res = 0;
4147         int i;
4148
4149         dprintk("bond=%p, name=%s, new_mtu=%d\n", bond,
4150                 (bond_dev ? bond_dev->name : "None"), new_mtu);
4151
4152         /* Can't hold bond->lock with bh disabled here since
4153          * some base drivers panic. On the other hand we can't
4154          * hold bond->lock without bh disabled because we'll
4155          * deadlock. The only solution is to rely on the fact
4156          * that we're under rtnl_lock here, and the slaves
4157          * list won't change. This doesn't solve the problem
4158          * of setting the slave's MTU while it is
4159          * transmitting, but the assumption is that the base
4160          * driver can handle that.
4161          *
4162          * TODO: figure out a way to safely iterate the slaves
4163          * list, but without holding a lock around the actual
4164          * call to the base driver.
4165          */
4166
4167         bond_for_each_slave(bond, slave, i) {
4168                 dprintk("s %p s->p %p c_m %p\n", slave,
4169                         slave->prev, slave->dev->change_mtu);
4170
4171                 res = dev_set_mtu(slave->dev, new_mtu);
4172
4173                 if (res) {
4174                         /* If we failed to set the slave's mtu to the new value
4175                          * we must abort the operation even in ACTIVE_BACKUP
4176                          * mode, because if we allow the backup slaves to have
4177                          * different mtu values than the active slave we'll
4178                          * need to change their mtu when doing a failover. That
4179                          * means changing their mtu from timer context, which
4180                          * is probably not a good idea.
4181                          */
4182                         dprintk("err %d %s\n", res, slave->dev->name);
4183                         goto unwind;
4184                 }
4185         }
4186
4187         bond_dev->mtu = new_mtu;
4188
4189         return 0;
4190
4191 unwind:
4192         /* unwind from head to the slave that failed */
4193         stop_at = slave;
4194         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4195                 int tmp_res;
4196
4197                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4198                 if (tmp_res) {
4199                         dprintk("unwind err %d dev %s\n", tmp_res,
4200                                 slave->dev->name);
4201                 }
4202         }
4203
4204         return res;
4205 }
4206
4207 /*
4208  * Change HW address
4209  *
4210  * Note that many devices must be down to change the HW address, and
4211  * downing the master releases all slaves.  We can make bonds full of
4212  * bonding devices to test this, however.
4213  */
4214 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4215 {
4216         struct bonding *bond = netdev_priv(bond_dev);
4217         struct sockaddr *sa = addr, tmp_sa;
4218         struct slave *slave, *stop_at;
4219         int res = 0;
4220         int i;
4221
4222         if (bond->params.mode == BOND_MODE_ALB)
4223                 return bond_alb_set_mac_address(bond_dev, addr);
4224
4225
4226         dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4227
4228         /*
4229          * If fail_over_mac is set to active, do nothing and return
4230          * success.  Returning an error causes ifenslave to fail.
4231          */
4232         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4233                 return 0;
4234
4235         if (!is_valid_ether_addr(sa->sa_data)) {
4236                 return -EADDRNOTAVAIL;
4237         }
4238
4239         /* Can't hold bond->lock with bh disabled here since
4240          * some base drivers panic. On the other hand we can't
4241          * hold bond->lock without bh disabled because we'll
4242          * deadlock. The only solution is to rely on the fact
4243          * that we're under rtnl_lock here, and the slaves
4244          * list won't change. This doesn't solve the problem
4245          * of setting the slave's hw address while it is
4246          * transmitting, but the assumption is that the base
4247          * driver can handle that.
4248          *
4249          * TODO: figure out a way to safely iterate the slaves
4250          * list, but without holding a lock around the actual
4251          * call to the base driver.
4252          */
4253
4254         bond_for_each_slave(bond, slave, i) {
4255                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4256                 dprintk("slave %p %s\n", slave, slave->dev->name);
4257
4258                 if (slave_ops->ndo_set_mac_address == NULL) {
4259                         res = -EOPNOTSUPP;
4260                         dprintk("EOPNOTSUPP %s\n", slave->dev->name);
4261                         goto unwind;
4262                 }
4263
4264                 res = dev_set_mac_address(slave->dev, addr);
4265                 if (res) {
4266                         /* TODO: consider downing the slave
4267                          * and retry ?
4268                          * User should expect communications
4269                          * breakage anyway until ARP finish
4270                          * updating, so...
4271                          */
4272                         dprintk("err %d %s\n", res, slave->dev->name);
4273                         goto unwind;
4274                 }
4275         }
4276
4277         /* success */
4278         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4279         return 0;
4280
4281 unwind:
4282         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4283         tmp_sa.sa_family = bond_dev->type;
4284
4285         /* unwind from head to the slave that failed */
4286         stop_at = slave;
4287         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4288                 int tmp_res;
4289
4290                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4291                 if (tmp_res) {
4292                         dprintk("unwind err %d dev %s\n", tmp_res,
4293                                 slave->dev->name);
4294                 }
4295         }
4296
4297         return res;
4298 }
4299
4300 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4301 {
4302         struct bonding *bond = netdev_priv(bond_dev);
4303         struct slave *slave, *start_at;
4304         int i, slave_no, res = 1;
4305
4306         read_lock(&bond->lock);
4307
4308         if (!BOND_IS_OK(bond)) {
4309                 goto out;
4310         }
4311
4312         /*
4313          * Concurrent TX may collide on rr_tx_counter; we accept that
4314          * as being rare enough not to justify using an atomic op here
4315          */
4316         slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4317
4318         bond_for_each_slave(bond, slave, i) {
4319                 slave_no--;
4320                 if (slave_no < 0) {
4321                         break;
4322                 }
4323         }
4324
4325         start_at = slave;
4326         bond_for_each_slave_from(bond, slave, i, start_at) {
4327                 if (IS_UP(slave->dev) &&
4328                     (slave->link == BOND_LINK_UP) &&
4329                     (slave->state == BOND_STATE_ACTIVE)) {
4330                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4331                         break;
4332                 }
4333         }
4334
4335 out:
4336         if (res) {
4337                 /* no suitable interface, frame not sent */
4338                 dev_kfree_skb(skb);
4339         }
4340         read_unlock(&bond->lock);
4341         return 0;
4342 }
4343
4344
4345 /*
4346  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4347  * the bond has a usable interface.
4348  */
4349 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4350 {
4351         struct bonding *bond = netdev_priv(bond_dev);
4352         int res = 1;
4353
4354         read_lock(&bond->lock);
4355         read_lock(&bond->curr_slave_lock);
4356
4357         if (!BOND_IS_OK(bond)) {
4358                 goto out;
4359         }
4360
4361         if (!bond->curr_active_slave)
4362                 goto out;
4363
4364         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4365
4366 out:
4367         if (res) {
4368                 /* no suitable interface, frame not sent */
4369                 dev_kfree_skb(skb);
4370         }
4371         read_unlock(&bond->curr_slave_lock);
4372         read_unlock(&bond->lock);
4373         return 0;
4374 }
4375
4376 /*
4377  * In bond_xmit_xor() , we determine the output device by using a pre-
4378  * determined xmit_hash_policy(), If the selected device is not enabled,
4379  * find the next active slave.
4380  */
4381 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4382 {
4383         struct bonding *bond = netdev_priv(bond_dev);
4384         struct slave *slave, *start_at;
4385         int slave_no;
4386         int i;
4387         int res = 1;
4388
4389         read_lock(&bond->lock);
4390
4391         if (!BOND_IS_OK(bond)) {
4392                 goto out;
4393         }
4394
4395         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4396
4397         bond_for_each_slave(bond, slave, i) {
4398                 slave_no--;
4399                 if (slave_no < 0) {
4400                         break;
4401                 }
4402         }
4403
4404         start_at = slave;
4405
4406         bond_for_each_slave_from(bond, slave, i, start_at) {
4407                 if (IS_UP(slave->dev) &&
4408                     (slave->link == BOND_LINK_UP) &&
4409                     (slave->state == BOND_STATE_ACTIVE)) {
4410                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4411                         break;
4412                 }
4413         }
4414
4415 out:
4416         if (res) {
4417                 /* no suitable interface, frame not sent */
4418                 dev_kfree_skb(skb);
4419         }
4420         read_unlock(&bond->lock);
4421         return 0;
4422 }
4423
4424 /*
4425  * in broadcast mode, we send everything to all usable interfaces.
4426  */
4427 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4428 {
4429         struct bonding *bond = netdev_priv(bond_dev);
4430         struct slave *slave, *start_at;
4431         struct net_device *tx_dev = NULL;
4432         int i;
4433         int res = 1;
4434
4435         read_lock(&bond->lock);
4436
4437         if (!BOND_IS_OK(bond)) {
4438                 goto out;
4439         }
4440
4441         read_lock(&bond->curr_slave_lock);
4442         start_at = bond->curr_active_slave;
4443         read_unlock(&bond->curr_slave_lock);
4444
4445         if (!start_at) {
4446                 goto out;
4447         }
4448
4449         bond_for_each_slave_from(bond, slave, i, start_at) {
4450                 if (IS_UP(slave->dev) &&
4451                     (slave->link == BOND_LINK_UP) &&
4452                     (slave->state == BOND_STATE_ACTIVE)) {
4453                         if (tx_dev) {
4454                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4455                                 if (!skb2) {
4456                                         printk(KERN_ERR DRV_NAME
4457                                                ": %s: Error: bond_xmit_broadcast(): "
4458                                                "skb_clone() failed\n",
4459                                                bond_dev->name);
4460                                         continue;
4461                                 }
4462
4463                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4464                                 if (res) {
4465                                         dev_kfree_skb(skb2);
4466                                         continue;
4467                                 }
4468                         }
4469                         tx_dev = slave->dev;
4470                 }
4471         }
4472
4473         if (tx_dev) {
4474                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4475         }
4476
4477 out:
4478         if (res) {
4479                 /* no suitable interface, frame not sent */
4480                 dev_kfree_skb(skb);
4481         }
4482         /* frame sent to all suitable interfaces */
4483         read_unlock(&bond->lock);
4484         return 0;
4485 }
4486
4487 /*------------------------- Device initialization ---------------------------*/
4488
4489 static void bond_set_xmit_hash_policy(struct bonding *bond)
4490 {
4491         switch (bond->params.xmit_policy) {
4492         case BOND_XMIT_POLICY_LAYER23:
4493                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4494                 break;
4495         case BOND_XMIT_POLICY_LAYER34:
4496                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4497                 break;
4498         case BOND_XMIT_POLICY_LAYER2:
4499         default:
4500                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4501                 break;
4502         }
4503 }
4504
4505 static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4506 {
4507         const struct bonding *bond = netdev_priv(dev);
4508
4509         switch (bond->params.mode) {
4510         case BOND_MODE_ROUNDROBIN:
4511                 return bond_xmit_roundrobin(skb, dev);
4512         case BOND_MODE_ACTIVEBACKUP:
4513                 return bond_xmit_activebackup(skb, dev);
4514         case BOND_MODE_XOR:
4515                 return bond_xmit_xor(skb, dev);
4516         case BOND_MODE_BROADCAST:
4517                 return bond_xmit_broadcast(skb, dev);
4518         case BOND_MODE_8023AD:
4519                 return bond_3ad_xmit_xor(skb, dev);
4520         case BOND_MODE_ALB:
4521         case BOND_MODE_TLB:
4522                 return bond_alb_xmit(skb, dev);
4523         default:
4524                 /* Should never happen, mode already checked */
4525                 printk(KERN_ERR DRV_NAME ": %s: Error: Unknown bonding mode %d\n",
4526                      dev->name, bond->params.mode);
4527                 WARN_ON_ONCE(1);
4528                 dev_kfree_skb(skb);
4529                 return NETDEV_TX_OK;
4530         }
4531 }
4532
4533
4534 /*
4535  * set bond mode specific net device operations
4536  */
4537 void bond_set_mode_ops(struct bonding *bond, int mode)
4538 {
4539         struct net_device *bond_dev = bond->dev;
4540
4541         switch (mode) {
4542         case BOND_MODE_ROUNDROBIN:
4543                 break;
4544         case BOND_MODE_ACTIVEBACKUP:
4545                 break;
4546         case BOND_MODE_XOR:
4547                 bond_set_xmit_hash_policy(bond);
4548                 break;
4549         case BOND_MODE_BROADCAST:
4550                 break;
4551         case BOND_MODE_8023AD:
4552                 bond_set_master_3ad_flags(bond);
4553                 bond_set_xmit_hash_policy(bond);
4554                 break;
4555         case BOND_MODE_ALB:
4556                 bond_set_master_alb_flags(bond);
4557                 /* FALLTHRU */
4558         case BOND_MODE_TLB:
4559                 break;
4560         default:
4561                 /* Should never happen, mode already checked */
4562                 printk(KERN_ERR DRV_NAME
4563                        ": %s: Error: Unknown bonding mode %d\n",
4564                        bond_dev->name,
4565                        mode);
4566                 break;
4567         }
4568 }
4569
4570 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4571                                     struct ethtool_drvinfo *drvinfo)
4572 {
4573         strncpy(drvinfo->driver, DRV_NAME, 32);
4574         strncpy(drvinfo->version, DRV_VERSION, 32);
4575         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4576 }
4577
4578 static const struct ethtool_ops bond_ethtool_ops = {
4579         .get_drvinfo            = bond_ethtool_get_drvinfo,
4580         .get_link               = ethtool_op_get_link,
4581         .get_tx_csum            = ethtool_op_get_tx_csum,
4582         .get_sg                 = ethtool_op_get_sg,
4583         .get_tso                = ethtool_op_get_tso,
4584         .get_ufo                = ethtool_op_get_ufo,
4585         .get_flags              = ethtool_op_get_flags,
4586 };
4587
4588 static const struct net_device_ops bond_netdev_ops = {
4589         .ndo_open               = bond_open,
4590         .ndo_stop               = bond_close,
4591         .ndo_start_xmit         = bond_start_xmit,
4592         .ndo_get_stats          = bond_get_stats,
4593         .ndo_do_ioctl           = bond_do_ioctl,
4594         .ndo_set_multicast_list = bond_set_multicast_list,
4595         .ndo_change_mtu         = bond_change_mtu,
4596         .ndo_set_mac_address    = bond_set_mac_address,
4597         .ndo_neigh_setup        = bond_neigh_setup,
4598         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4599         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4600         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4601 };
4602
4603 /*
4604  * Does not allocate but creates a /proc entry.
4605  * Allowed to fail.
4606  */
4607 static int bond_init(struct net_device *bond_dev, struct bond_params *params)
4608 {
4609         struct bonding *bond = netdev_priv(bond_dev);
4610
4611         dprintk("Begin bond_init for %s\n", bond_dev->name);
4612
4613         /* initialize rwlocks */
4614         rwlock_init(&bond->lock);
4615         rwlock_init(&bond->curr_slave_lock);
4616
4617         bond->params = *params; /* copy params struct */
4618
4619         bond->wq = create_singlethread_workqueue(bond_dev->name);
4620         if (!bond->wq)
4621                 return -ENOMEM;
4622
4623         /* Initialize pointers */
4624         bond->first_slave = NULL;
4625         bond->curr_active_slave = NULL;
4626         bond->current_arp_slave = NULL;
4627         bond->primary_slave = NULL;
4628         bond->dev = bond_dev;
4629         bond->send_grat_arp = 0;
4630         bond->send_unsol_na = 0;
4631         bond->setup_by_slave = 0;
4632         INIT_LIST_HEAD(&bond->vlan_list);
4633
4634         /* Initialize the device entry points */
4635         bond_dev->netdev_ops = &bond_netdev_ops;
4636         bond_dev->ethtool_ops = &bond_ethtool_ops;
4637         bond_set_mode_ops(bond, bond->params.mode);
4638
4639         bond_dev->destructor = bond_destructor;
4640
4641         /* Initialize the device options */
4642         bond_dev->tx_queue_len = 0;
4643         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4644         bond_dev->priv_flags |= IFF_BONDING;
4645         if (bond->params.arp_interval)
4646                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4647
4648         /* At first, we block adding VLANs. That's the only way to
4649          * prevent problems that occur when adding VLANs over an
4650          * empty bond. The block will be removed once non-challenged
4651          * slaves are enslaved.
4652          */
4653         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4654
4655         /* don't acquire bond device's netif_tx_lock when
4656          * transmitting */
4657         bond_dev->features |= NETIF_F_LLTX;
4658
4659         /* By default, we declare the bond to be fully
4660          * VLAN hardware accelerated capable. Special
4661          * care is taken in the various xmit functions
4662          * when there are slaves that are not hw accel
4663          * capable
4664          */
4665         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4666                                NETIF_F_HW_VLAN_RX |
4667                                NETIF_F_HW_VLAN_FILTER);
4668
4669 #ifdef CONFIG_PROC_FS
4670         bond_create_proc_entry(bond);
4671 #endif
4672         list_add_tail(&bond->bond_list, &bond_dev_list);
4673
4674         return 0;
4675 }
4676
4677 static void bond_work_cancel_all(struct bonding *bond)
4678 {
4679         write_lock_bh(&bond->lock);
4680         bond->kill_timers = 1;
4681         write_unlock_bh(&bond->lock);
4682
4683         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4684                 cancel_delayed_work(&bond->mii_work);
4685
4686         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4687                 cancel_delayed_work(&bond->arp_work);
4688
4689         if (bond->params.mode == BOND_MODE_ALB &&
4690             delayed_work_pending(&bond->alb_work))
4691                 cancel_delayed_work(&bond->alb_work);
4692
4693         if (bond->params.mode == BOND_MODE_8023AD &&
4694             delayed_work_pending(&bond->ad_work))
4695                 cancel_delayed_work(&bond->ad_work);
4696 }
4697
4698 /* De-initialize device specific data.
4699  * Caller must hold rtnl_lock.
4700  */
4701 static void bond_deinit(struct net_device *bond_dev)
4702 {
4703         struct bonding *bond = netdev_priv(bond_dev);
4704
4705         list_del(&bond->bond_list);
4706
4707         bond_work_cancel_all(bond);
4708
4709 #ifdef CONFIG_PROC_FS
4710         bond_remove_proc_entry(bond);
4711 #endif
4712 }
4713
4714 /* Unregister and free all bond devices.
4715  * Caller must hold rtnl_lock.
4716  */
4717 static void bond_free_all(void)
4718 {
4719         struct bonding *bond, *nxt;
4720
4721         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4722                 struct net_device *bond_dev = bond->dev;
4723
4724                 bond_work_cancel_all(bond);
4725                 /* Release the bonded slaves */
4726                 bond_release_all(bond_dev);
4727                 bond_destroy(bond);
4728         }
4729
4730 #ifdef CONFIG_PROC_FS
4731         bond_destroy_proc_dir();
4732 #endif
4733 }
4734
4735 /*------------------------- Module initialization ---------------------------*/
4736
4737 /*
4738  * Convert string input module parms.  Accept either the
4739  * number of the mode or its string name.  A bit complicated because
4740  * some mode names are substrings of other names, and calls from sysfs
4741  * may have whitespace in the name (trailing newlines, for example).
4742  */
4743 int bond_parse_parm(const char *buf, struct bond_parm_tbl *tbl)
4744 {
4745         int mode = -1, i, rv;
4746         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4747
4748         for (p = (char *)buf; *p; p++)
4749                 if (!(isdigit(*p) || isspace(*p)))
4750                         break;
4751
4752         if (*p)
4753                 rv = sscanf(buf, "%20s", modestr);
4754         else
4755                 rv = sscanf(buf, "%d", &mode);
4756
4757         if (!rv)
4758                 return -1;
4759
4760         for (i = 0; tbl[i].modename; i++) {
4761                 if (mode == tbl[i].mode)
4762                         return tbl[i].mode;
4763                 if (strcmp(modestr, tbl[i].modename) == 0)
4764                         return tbl[i].mode;
4765         }
4766
4767         return -1;
4768 }
4769
4770 static int bond_check_params(struct bond_params *params)
4771 {
4772         int arp_validate_value, fail_over_mac_value;
4773
4774         /*
4775          * Convert string parameters.
4776          */
4777         if (mode) {
4778                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4779                 if (bond_mode == -1) {
4780                         printk(KERN_ERR DRV_NAME
4781                                ": Error: Invalid bonding mode \"%s\"\n",
4782                                mode == NULL ? "NULL" : mode);
4783                         return -EINVAL;
4784                 }
4785         }
4786
4787         if (xmit_hash_policy) {
4788                 if ((bond_mode != BOND_MODE_XOR) &&
4789                     (bond_mode != BOND_MODE_8023AD)) {
4790                         printk(KERN_INFO DRV_NAME
4791                                ": xor_mode param is irrelevant in mode %s\n",
4792                                bond_mode_name(bond_mode));
4793                 } else {
4794                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4795                                                         xmit_hashtype_tbl);
4796                         if (xmit_hashtype == -1) {
4797                                 printk(KERN_ERR DRV_NAME
4798                                 ": Error: Invalid xmit_hash_policy \"%s\"\n",
4799                                 xmit_hash_policy == NULL ? "NULL" :
4800                                        xmit_hash_policy);
4801                                 return -EINVAL;
4802                         }
4803                 }
4804         }
4805
4806         if (lacp_rate) {
4807                 if (bond_mode != BOND_MODE_8023AD) {
4808                         printk(KERN_INFO DRV_NAME
4809                                ": lacp_rate param is irrelevant in mode %s\n",
4810                                bond_mode_name(bond_mode));
4811                 } else {
4812                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4813                         if (lacp_fast == -1) {
4814                                 printk(KERN_ERR DRV_NAME
4815                                        ": Error: Invalid lacp rate \"%s\"\n",
4816                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4817                                 return -EINVAL;
4818                         }
4819                 }
4820         }
4821
4822         if (ad_select) {
4823                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4824                 if (params->ad_select == -1) {
4825                         printk(KERN_ERR DRV_NAME
4826                                ": Error: Invalid ad_select \"%s\"\n",
4827                                ad_select == NULL ? "NULL" : ad_select);
4828                         return -EINVAL;
4829                 }
4830
4831                 if (bond_mode != BOND_MODE_8023AD) {
4832                         printk(KERN_WARNING DRV_NAME
4833                                ": ad_select param only affects 802.3ad mode\n");
4834                 }
4835         } else {
4836                 params->ad_select = BOND_AD_STABLE;
4837         }
4838
4839         if (max_bonds < 0 || max_bonds > INT_MAX) {
4840                 printk(KERN_WARNING DRV_NAME
4841                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4842                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4843                        max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4844                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4845         }
4846
4847         if (miimon < 0) {
4848                 printk(KERN_WARNING DRV_NAME
4849                        ": Warning: miimon module parameter (%d), "
4850                        "not in range 0-%d, so it was reset to %d\n",
4851                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4852                 miimon = BOND_LINK_MON_INTERV;
4853         }
4854
4855         if (updelay < 0) {
4856                 printk(KERN_WARNING DRV_NAME
4857                        ": Warning: updelay module parameter (%d), "
4858                        "not in range 0-%d, so it was reset to 0\n",
4859                        updelay, INT_MAX);
4860                 updelay = 0;
4861         }
4862
4863         if (downdelay < 0) {
4864                 printk(KERN_WARNING DRV_NAME
4865                        ": Warning: downdelay module parameter (%d), "
4866                        "not in range 0-%d, so it was reset to 0\n",
4867                        downdelay, INT_MAX);
4868                 downdelay = 0;
4869         }
4870
4871         if ((use_carrier != 0) && (use_carrier != 1)) {
4872                 printk(KERN_WARNING DRV_NAME
4873                        ": Warning: use_carrier module parameter (%d), "
4874                        "not of valid value (0/1), so it was set to 1\n",
4875                        use_carrier);
4876                 use_carrier = 1;
4877         }
4878
4879         if (num_grat_arp < 0 || num_grat_arp > 255) {
4880                 printk(KERN_WARNING DRV_NAME
4881                        ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4882                        "was reset to 1 \n", num_grat_arp);
4883                 num_grat_arp = 1;
4884         }
4885
4886         if (num_unsol_na < 0 || num_unsol_na > 255) {
4887                 printk(KERN_WARNING DRV_NAME
4888                        ": Warning: num_unsol_na (%d) not in range 0-255 so it "
4889                        "was reset to 1 \n", num_unsol_na);
4890                 num_unsol_na = 1;
4891         }
4892
4893         /* reset values for 802.3ad */
4894         if (bond_mode == BOND_MODE_8023AD) {
4895                 if (!miimon) {
4896                         printk(KERN_WARNING DRV_NAME
4897                                ": Warning: miimon must be specified, "
4898                                "otherwise bonding will not detect link "
4899                                "failure, speed and duplex which are "
4900                                "essential for 802.3ad operation\n");
4901                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4902                         miimon = 100;
4903                 }
4904         }
4905
4906         /* reset values for TLB/ALB */
4907         if ((bond_mode == BOND_MODE_TLB) ||
4908             (bond_mode == BOND_MODE_ALB)) {
4909                 if (!miimon) {
4910                         printk(KERN_WARNING DRV_NAME
4911                                ": Warning: miimon must be specified, "
4912                                "otherwise bonding will not detect link "
4913                                "failure and link speed which are essential "
4914                                "for TLB/ALB load balancing\n");
4915                         printk(KERN_WARNING "Forcing miimon to 100msec\n");
4916                         miimon = 100;
4917                 }
4918         }
4919
4920         if (bond_mode == BOND_MODE_ALB) {
4921                 printk(KERN_NOTICE DRV_NAME
4922                        ": In ALB mode you might experience client "
4923                        "disconnections upon reconnection of a link if the "
4924                        "bonding module updelay parameter (%d msec) is "
4925                        "incompatible with the forwarding delay time of the "
4926                        "switch\n",
4927                        updelay);
4928         }
4929
4930         if (!miimon) {
4931                 if (updelay || downdelay) {
4932                         /* just warn the user the up/down delay will have
4933                          * no effect since miimon is zero...
4934                          */
4935                         printk(KERN_WARNING DRV_NAME
4936                                ": Warning: miimon module parameter not set "
4937                                "and updelay (%d) or downdelay (%d) module "
4938                                "parameter is set; updelay and downdelay have "
4939                                "no effect unless miimon is set\n",
4940                                updelay, downdelay);
4941                 }
4942         } else {
4943                 /* don't allow arp monitoring */
4944                 if (arp_interval) {
4945                         printk(KERN_WARNING DRV_NAME
4946                                ": Warning: miimon (%d) and arp_interval (%d) "
4947                                "can't be used simultaneously, disabling ARP "
4948                                "monitoring\n",
4949                                miimon, arp_interval);
4950                         arp_interval = 0;
4951                 }
4952
4953                 if ((updelay % miimon) != 0) {
4954                         printk(KERN_WARNING DRV_NAME
4955                                ": Warning: updelay (%d) is not a multiple "
4956                                "of miimon (%d), updelay rounded to %d ms\n",
4957                                updelay, miimon, (updelay / miimon) * miimon);
4958                 }
4959
4960                 updelay /= miimon;
4961
4962                 if ((downdelay % miimon) != 0) {
4963                         printk(KERN_WARNING DRV_NAME
4964                                ": Warning: downdelay (%d) is not a multiple "
4965                                "of miimon (%d), downdelay rounded to %d ms\n",
4966                                downdelay, miimon,
4967                                (downdelay / miimon) * miimon);
4968                 }
4969
4970                 downdelay /= miimon;
4971         }
4972
4973         if (arp_interval < 0) {
4974                 printk(KERN_WARNING DRV_NAME
4975                        ": Warning: arp_interval module parameter (%d) "
4976                        ", not in range 0-%d, so it was reset to %d\n",
4977                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4978                 arp_interval = BOND_LINK_ARP_INTERV;
4979         }
4980
4981         for (arp_ip_count = 0;
4982              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4983              arp_ip_count++) {
4984                 /* not complete check, but should be good enough to
4985                    catch mistakes */
4986                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4987                         printk(KERN_WARNING DRV_NAME
4988                                ": Warning: bad arp_ip_target module parameter "
4989                                "(%s), ARP monitoring will not be performed\n",
4990                                arp_ip_target[arp_ip_count]);
4991                         arp_interval = 0;
4992                 } else {
4993                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4994                         arp_target[arp_ip_count] = ip;
4995                 }
4996         }
4997
4998         if (arp_interval && !arp_ip_count) {
4999                 /* don't allow arping if no arp_ip_target given... */
5000                 printk(KERN_WARNING DRV_NAME
5001                        ": Warning: arp_interval module parameter (%d) "
5002                        "specified without providing an arp_ip_target "
5003                        "parameter, arp_interval was reset to 0\n",
5004                        arp_interval);
5005                 arp_interval = 0;
5006         }
5007
5008         if (arp_validate) {
5009                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
5010                         printk(KERN_ERR DRV_NAME
5011                ": arp_validate only supported in active-backup mode\n");
5012                         return -EINVAL;
5013                 }
5014                 if (!arp_interval) {
5015                         printk(KERN_ERR DRV_NAME
5016                                ": arp_validate requires arp_interval\n");
5017                         return -EINVAL;
5018                 }
5019
5020                 arp_validate_value = bond_parse_parm(arp_validate,
5021                                                      arp_validate_tbl);
5022                 if (arp_validate_value == -1) {
5023                         printk(KERN_ERR DRV_NAME
5024                                ": Error: invalid arp_validate \"%s\"\n",
5025                                arp_validate == NULL ? "NULL" : arp_validate);
5026                         return -EINVAL;
5027                 }
5028         } else
5029                 arp_validate_value = 0;
5030
5031         if (miimon) {
5032                 printk(KERN_INFO DRV_NAME
5033                        ": MII link monitoring set to %d ms\n",
5034                        miimon);
5035         } else if (arp_interval) {
5036                 int i;
5037
5038                 printk(KERN_INFO DRV_NAME
5039                        ": ARP monitoring set to %d ms, validate %s, with %d target(s):",
5040                        arp_interval,
5041                        arp_validate_tbl[arp_validate_value].modename,
5042                        arp_ip_count);
5043
5044                 for (i = 0; i < arp_ip_count; i++)
5045                         printk (" %s", arp_ip_target[i]);
5046
5047                 printk("\n");
5048
5049         } else if (max_bonds) {
5050                 /* miimon and arp_interval not set, we need one so things
5051                  * work as expected, see bonding.txt for details
5052                  */
5053                 printk(KERN_WARNING DRV_NAME
5054                        ": Warning: either miimon or arp_interval and "
5055                        "arp_ip_target module parameters must be specified, "
5056                        "otherwise bonding will not detect link failures! see "
5057                        "bonding.txt for details.\n");
5058         }
5059
5060         if (primary && !USES_PRIMARY(bond_mode)) {
5061                 /* currently, using a primary only makes sense
5062                  * in active backup, TLB or ALB modes
5063                  */
5064                 printk(KERN_WARNING DRV_NAME
5065                        ": Warning: %s primary device specified but has no "
5066                        "effect in %s mode\n",
5067                        primary, bond_mode_name(bond_mode));
5068                 primary = NULL;
5069         }
5070
5071         if (fail_over_mac) {
5072                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5073                                                       fail_over_mac_tbl);
5074                 if (fail_over_mac_value == -1) {
5075                         printk(KERN_ERR DRV_NAME
5076                                ": Error: invalid fail_over_mac \"%s\"\n",
5077                                arp_validate == NULL ? "NULL" : arp_validate);
5078                         return -EINVAL;
5079                 }
5080
5081                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5082                         printk(KERN_WARNING DRV_NAME
5083                                ": Warning: fail_over_mac only affects "
5084                                "active-backup mode.\n");
5085         } else {
5086                 fail_over_mac_value = BOND_FOM_NONE;
5087         }
5088
5089         /* fill params struct with the proper values */
5090         params->mode = bond_mode;
5091         params->xmit_policy = xmit_hashtype;
5092         params->miimon = miimon;
5093         params->num_grat_arp = num_grat_arp;
5094         params->num_unsol_na = num_unsol_na;
5095         params->arp_interval = arp_interval;
5096         params->arp_validate = arp_validate_value;
5097         params->updelay = updelay;
5098         params->downdelay = downdelay;
5099         params->use_carrier = use_carrier;
5100         params->lacp_fast = lacp_fast;
5101         params->primary[0] = 0;
5102         params->fail_over_mac = fail_over_mac_value;
5103
5104         if (primary) {
5105                 strncpy(params->primary, primary, IFNAMSIZ);
5106                 params->primary[IFNAMSIZ - 1] = 0;
5107         }
5108
5109         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5110
5111         return 0;
5112 }
5113
5114 static struct lock_class_key bonding_netdev_xmit_lock_key;
5115 static struct lock_class_key bonding_netdev_addr_lock_key;
5116
5117 static void bond_set_lockdep_class_one(struct net_device *dev,
5118                                        struct netdev_queue *txq,
5119                                        void *_unused)
5120 {
5121         lockdep_set_class(&txq->_xmit_lock,
5122                           &bonding_netdev_xmit_lock_key);
5123 }
5124
5125 static void bond_set_lockdep_class(struct net_device *dev)
5126 {
5127         lockdep_set_class(&dev->addr_list_lock,
5128                           &bonding_netdev_addr_lock_key);
5129         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5130 }
5131
5132 /* Create a new bond based on the specified name and bonding parameters.
5133  * If name is NULL, obtain a suitable "bond%d" name for us.
5134  * Caller must NOT hold rtnl_lock; we need to release it here before we
5135  * set up our sysfs entries.
5136  */
5137 int bond_create(char *name, struct bond_params *params)
5138 {
5139         struct net_device *bond_dev;
5140         struct bonding *bond;
5141         int res;
5142
5143         rtnl_lock();
5144         down_write(&bonding_rwsem);
5145
5146         /* Check to see if the bond already exists. */
5147         if (name) {
5148                 list_for_each_entry(bond, &bond_dev_list, bond_list)
5149                         if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
5150                                 printk(KERN_ERR DRV_NAME
5151                                ": cannot add bond %s; it already exists\n",
5152                                        name);
5153                                 res = -EPERM;
5154                                 goto out_rtnl;
5155                         }
5156         }
5157
5158         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5159                                 ether_setup);
5160         if (!bond_dev) {
5161                 printk(KERN_ERR DRV_NAME
5162                        ": %s: eek! can't alloc netdev!\n",
5163                        name);
5164                 res = -ENOMEM;
5165                 goto out_rtnl;
5166         }
5167
5168         if (!name) {
5169                 res = dev_alloc_name(bond_dev, "bond%d");
5170                 if (res < 0)
5171                         goto out_netdev;
5172         }
5173
5174         /* bond_init() must be called after dev_alloc_name() (for the
5175          * /proc files), but before register_netdevice(), because we
5176          * need to set function pointers.
5177          */
5178
5179         res = bond_init(bond_dev, params);
5180         if (res < 0) {
5181                 goto out_netdev;
5182         }
5183
5184         res = register_netdevice(bond_dev);
5185         if (res < 0) {
5186                 goto out_bond;
5187         }
5188
5189         bond_set_lockdep_class(bond_dev);
5190
5191         netif_carrier_off(bond_dev);
5192
5193         up_write(&bonding_rwsem);
5194         rtnl_unlock(); /* allows sysfs registration of net device */
5195         res = bond_create_sysfs_entry(netdev_priv(bond_dev));
5196         if (res < 0) {
5197                 rtnl_lock();
5198                 down_write(&bonding_rwsem);
5199                 bond_deinit(bond_dev);
5200                 unregister_netdevice(bond_dev);
5201                 goto out_rtnl;
5202         }
5203
5204         return 0;
5205
5206 out_bond:
5207         bond_deinit(bond_dev);
5208 out_netdev:
5209         free_netdev(bond_dev);
5210 out_rtnl:
5211         up_write(&bonding_rwsem);
5212         rtnl_unlock();
5213         return res;
5214 }
5215
5216 static int __init bonding_init(void)
5217 {
5218         int i;
5219         int res;
5220         struct bonding *bond;
5221
5222         printk(KERN_INFO "%s", version);
5223
5224         res = bond_check_params(&bonding_defaults);
5225         if (res) {
5226                 goto out;
5227         }
5228
5229 #ifdef CONFIG_PROC_FS
5230         bond_create_proc_dir();
5231 #endif
5232
5233         init_rwsem(&bonding_rwsem);
5234
5235         for (i = 0; i < max_bonds; i++) {
5236                 res = bond_create(NULL, &bonding_defaults);
5237                 if (res)
5238                         goto err;
5239         }
5240
5241         res = bond_create_sysfs();
5242         if (res)
5243                 goto err;
5244
5245         register_netdevice_notifier(&bond_netdev_notifier);
5246         register_inetaddr_notifier(&bond_inetaddr_notifier);
5247         bond_register_ipv6_notifier();
5248
5249         goto out;
5250 err:
5251         list_for_each_entry(bond, &bond_dev_list, bond_list) {
5252                 bond_work_cancel_all(bond);
5253                 destroy_workqueue(bond->wq);
5254         }
5255
5256         bond_destroy_sysfs();
5257
5258         rtnl_lock();
5259         bond_free_all();
5260         rtnl_unlock();
5261 out:
5262         return res;
5263
5264 }
5265
5266 static void __exit bonding_exit(void)
5267 {
5268         unregister_netdevice_notifier(&bond_netdev_notifier);
5269         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5270         bond_unregister_ipv6_notifier();
5271
5272         bond_destroy_sysfs();
5273
5274         rtnl_lock();
5275         bond_free_all();
5276         rtnl_unlock();
5277 }
5278
5279 module_init(bonding_init);
5280 module_exit(bonding_exit);
5281 MODULE_LICENSE("GPL");
5282 MODULE_VERSION(DRV_VERSION);
5283 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5284 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5285 MODULE_SUPPORTED_DEVICE("most ethernet devices");
5286
5287 /*
5288  * Local variables:
5289  *  c-indent-level: 8
5290  *  c-basic-offset: 8
5291  *  tab-width: 8
5292  * End:
5293  */
5294