bonding: network device names are case sensative
[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 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/in.h>
42 #include <net/ip.h>
43 #include <linux/ip.h>
44 #include <linux/tcp.h>
45 #include <linux/udp.h>
46 #include <linux/slab.h>
47 #include <linux/string.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/socket.h>
51 #include <linux/ctype.h>
52 #include <linux/inet.h>
53 #include <linux/bitops.h>
54 #include <linux/io.h>
55 #include <asm/system.h>
56 #include <asm/dma.h>
57 #include <linux/uaccess.h>
58 #include <linux/errno.h>
59 #include <linux/netdevice.h>
60 #include <linux/inetdevice.h>
61 #include <linux/igmp.h>
62 #include <linux/etherdevice.h>
63 #include <linux/skbuff.h>
64 #include <net/sock.h>
65 #include <linux/rtnetlink.h>
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
68 #include <linux/smp.h>
69 #include <linux/if_ether.h>
70 #include <net/arp.h>
71 #include <linux/mii.h>
72 #include <linux/ethtool.h>
73 #include <linux/if_vlan.h>
74 #include <linux/if_bonding.h>
75 #include <linux/jiffies.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include "bonding.h"
79 #include "bond_3ad.h"
80 #include "bond_alb.h"
81
82 /*---------------------------- Module parameters ----------------------------*/
83
84 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
85 #define BOND_LINK_MON_INTERV    0
86 #define BOND_LINK_ARP_INTERV    0
87
88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
89 static int num_grat_arp = 1;
90 static int num_unsol_na = 1;
91 static int miimon       = BOND_LINK_MON_INTERV;
92 static int updelay;
93 static int downdelay;
94 static int use_carrier  = 1;
95 static char *mode;
96 static char *primary;
97 static char *lacp_rate;
98 static char *ad_select;
99 static char *xmit_hash_policy;
100 static int arp_interval = BOND_LINK_ARP_INTERV;
101 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
102 static char *arp_validate;
103 static char *fail_over_mac;
104 static struct bond_params bonding_defaults;
105
106 module_param(max_bonds, int, 0);
107 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
108 module_param(num_grat_arp, int, 0644);
109 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
110 module_param(num_unsol_na, int, 0644);
111 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
112 module_param(miimon, int, 0);
113 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
114 module_param(updelay, int, 0);
115 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
116 module_param(downdelay, int, 0);
117 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
118                             "in milliseconds");
119 module_param(use_carrier, int, 0);
120 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
121                               "0 for off, 1 for on (default)");
122 module_param(mode, charp, 0);
123 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
124                        "1 for active-backup, 2 for balance-xor, "
125                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
126                        "6 for balance-alb");
127 module_param(primary, charp, 0);
128 MODULE_PARM_DESC(primary, "Primary network device to use");
129 module_param(lacp_rate, charp, 0);
130 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
131                             "(slow/fast)");
132 module_param(ad_select, charp, 0);
133 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
134 module_param(xmit_hash_policy, charp, 0);
135 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
136                                    ", 1 for layer 3+4");
137 module_param(arp_interval, int, 0);
138 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
139 module_param_array(arp_ip_target, charp, NULL, 0);
140 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
141 module_param(arp_validate, charp, 0);
142 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
143 module_param(fail_over_mac, charp, 0);
144 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
145
146 /*----------------------------- Global variables ----------------------------*/
147
148 static const char * const version =
149         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
150
151 LIST_HEAD(bond_dev_list);
152
153 #ifdef CONFIG_PROC_FS
154 static struct proc_dir_entry *bond_proc_dir;
155 #endif
156
157 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
158 static int arp_ip_count;
159 static int bond_mode    = BOND_MODE_ROUNDROBIN;
160 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
161 static int lacp_fast;
162
163
164 const struct bond_parm_tbl bond_lacp_tbl[] = {
165 {       "slow",         AD_LACP_SLOW},
166 {       "fast",         AD_LACP_FAST},
167 {       NULL,           -1},
168 };
169
170 const struct bond_parm_tbl bond_mode_tbl[] = {
171 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
172 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
173 {       "balance-xor",          BOND_MODE_XOR},
174 {       "broadcast",            BOND_MODE_BROADCAST},
175 {       "802.3ad",              BOND_MODE_8023AD},
176 {       "balance-tlb",          BOND_MODE_TLB},
177 {       "balance-alb",          BOND_MODE_ALB},
178 {       NULL,                   -1},
179 };
180
181 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
182 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
183 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
184 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
185 {       NULL,                   -1},
186 };
187
188 const struct bond_parm_tbl arp_validate_tbl[] = {
189 {       "none",                 BOND_ARP_VALIDATE_NONE},
190 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
191 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
192 {       "all",                  BOND_ARP_VALIDATE_ALL},
193 {       NULL,                   -1},
194 };
195
196 const struct bond_parm_tbl fail_over_mac_tbl[] = {
197 {       "none",                 BOND_FOM_NONE},
198 {       "active",               BOND_FOM_ACTIVE},
199 {       "follow",               BOND_FOM_FOLLOW},
200 {       NULL,                   -1},
201 };
202
203 struct bond_parm_tbl ad_select_tbl[] = {
204 {       "stable",       BOND_AD_STABLE},
205 {       "bandwidth",    BOND_AD_BANDWIDTH},
206 {       "count",        BOND_AD_COUNT},
207 {       NULL,           -1},
208 };
209
210 /*-------------------------- Forward declarations ---------------------------*/
211
212 static void bond_send_gratuitous_arp(struct bonding *bond);
213 static void bond_deinit(struct net_device *bond_dev);
214
215 /*---------------------------- General routines -----------------------------*/
216
217 static const char *bond_mode_name(int mode)
218 {
219         static const char *names[] = {
220                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
221                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
222                 [BOND_MODE_XOR] = "load balancing (xor)",
223                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
224                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
225                 [BOND_MODE_TLB] = "transmit load balancing",
226                 [BOND_MODE_ALB] = "adaptive load balancing",
227         };
228
229         if (mode < 0 || mode > BOND_MODE_ALB)
230                 return "unknown";
231
232         return names[mode];
233 }
234
235 /*---------------------------------- VLAN -----------------------------------*/
236
237 /**
238  * bond_add_vlan - add a new vlan id on bond
239  * @bond: bond that got the notification
240  * @vlan_id: the vlan id to add
241  *
242  * Returns -ENOMEM if allocation failed.
243  */
244 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
245 {
246         struct vlan_entry *vlan;
247
248         pr_debug("bond: %s, vlan id %d\n",
249                 (bond ? bond->dev->name : "None"), vlan_id);
250
251         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
252         if (!vlan)
253                 return -ENOMEM;
254
255         INIT_LIST_HEAD(&vlan->vlan_list);
256         vlan->vlan_id = vlan_id;
257
258         write_lock_bh(&bond->lock);
259
260         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
261
262         write_unlock_bh(&bond->lock);
263
264         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
265
266         return 0;
267 }
268
269 /**
270  * bond_del_vlan - delete a vlan id from bond
271  * @bond: bond that got the notification
272  * @vlan_id: the vlan id to delete
273  *
274  * returns -ENODEV if @vlan_id was not found in @bond.
275  */
276 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
277 {
278         struct vlan_entry *vlan;
279         int res = -ENODEV;
280
281         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
282
283         write_lock_bh(&bond->lock);
284
285         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
286                 if (vlan->vlan_id == vlan_id) {
287                         list_del(&vlan->vlan_list);
288
289                         if (bond_is_lb(bond))
290                                 bond_alb_clear_vlan(bond, vlan_id);
291
292                         pr_debug("removed VLAN ID %d from bond %s\n", vlan_id,
293                                 bond->dev->name);
294
295                         kfree(vlan);
296
297                         if (list_empty(&bond->vlan_list) &&
298                             (bond->slave_cnt == 0)) {
299                                 /* Last VLAN removed and no slaves, so
300                                  * restore block on adding VLANs. This will
301                                  * be removed once new slaves that are not
302                                  * VLAN challenged will be added.
303                                  */
304                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
305                         }
306
307                         res = 0;
308                         goto out;
309                 }
310         }
311
312         pr_debug("couldn't find VLAN ID %d in bond %s\n", vlan_id,
313                 bond->dev->name);
314
315 out:
316         write_unlock_bh(&bond->lock);
317         return res;
318 }
319
320 /**
321  * bond_has_challenged_slaves
322  * @bond: the bond we're working on
323  *
324  * Searches the slave list. Returns 1 if a vlan challenged slave
325  * was found, 0 otherwise.
326  *
327  * Assumes bond->lock is held.
328  */
329 static int bond_has_challenged_slaves(struct bonding *bond)
330 {
331         struct slave *slave;
332         int i;
333
334         bond_for_each_slave(bond, slave, i) {
335                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
336                         pr_debug("found VLAN challenged slave - %s\n",
337                                 slave->dev->name);
338                         return 1;
339                 }
340         }
341
342         pr_debug("no VLAN challenged slaves found\n");
343         return 0;
344 }
345
346 /**
347  * bond_next_vlan - safely skip to the next item in the vlans list.
348  * @bond: the bond we're working on
349  * @curr: item we're advancing from
350  *
351  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
352  * or @curr->next otherwise (even if it is @curr itself again).
353  *
354  * Caller must hold bond->lock
355  */
356 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
357 {
358         struct vlan_entry *next, *last;
359
360         if (list_empty(&bond->vlan_list))
361                 return NULL;
362
363         if (!curr) {
364                 next = list_entry(bond->vlan_list.next,
365                                   struct vlan_entry, vlan_list);
366         } else {
367                 last = list_entry(bond->vlan_list.prev,
368                                   struct vlan_entry, vlan_list);
369                 if (last == curr) {
370                         next = list_entry(bond->vlan_list.next,
371                                           struct vlan_entry, vlan_list);
372                 } else {
373                         next = list_entry(curr->vlan_list.next,
374                                           struct vlan_entry, vlan_list);
375                 }
376         }
377
378         return next;
379 }
380
381 /**
382  * bond_dev_queue_xmit - Prepare skb for xmit.
383  *
384  * @bond: bond device that got this skb for tx.
385  * @skb: hw accel VLAN tagged skb to transmit
386  * @slave_dev: slave that is supposed to xmit this skbuff
387  *
388  * When the bond gets an skb to transmit that is
389  * already hardware accelerated VLAN tagged, and it
390  * needs to relay this skb to a slave that is not
391  * hw accel capable, the skb needs to be "unaccelerated",
392  * i.e. strip the hwaccel tag and re-insert it as part
393  * of the payload.
394  */
395 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
396                         struct net_device *slave_dev)
397 {
398         unsigned short uninitialized_var(vlan_id);
399
400         if (!list_empty(&bond->vlan_list) &&
401             !(slave_dev->features & NETIF_F_HW_VLAN_TX) &&
402             vlan_get_tag(skb, &vlan_id) == 0) {
403                 skb->dev = slave_dev;
404                 skb = vlan_put_tag(skb, vlan_id);
405                 if (!skb) {
406                         /* vlan_put_tag() frees the skb in case of error,
407                          * so return success here so the calling functions
408                          * won't attempt to free is again.
409                          */
410                         return 0;
411                 }
412         } else {
413                 skb->dev = slave_dev;
414         }
415
416         skb->priority = 1;
417         dev_queue_xmit(skb);
418
419         return 0;
420 }
421
422 /*
423  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
424  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
425  * lock because:
426  * a. This operation is performed in IOCTL context,
427  * b. The operation is protected by the RTNL semaphore in the 8021q code,
428  * c. Holding a lock with BH disabled while directly calling a base driver
429  *    entry point is generally a BAD idea.
430  *
431  * The design of synchronization/protection for this operation in the 8021q
432  * module is good for one or more VLAN devices over a single physical device
433  * and cannot be extended for a teaming solution like bonding, so there is a
434  * potential race condition here where a net device from the vlan group might
435  * be referenced (either by a base driver or the 8021q code) while it is being
436  * removed from the system. However, it turns out we're not making matters
437  * worse, and if it works for regular VLAN usage it will work here too.
438 */
439
440 /**
441  * bond_vlan_rx_register - Propagates registration to slaves
442  * @bond_dev: bonding net device that got called
443  * @grp: vlan group being registered
444  */
445 static void bond_vlan_rx_register(struct net_device *bond_dev,
446                                   struct vlan_group *grp)
447 {
448         struct bonding *bond = netdev_priv(bond_dev);
449         struct slave *slave;
450         int i;
451
452         bond->vlgrp = grp;
453
454         bond_for_each_slave(bond, slave, i) {
455                 struct net_device *slave_dev = slave->dev;
456                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
457
458                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
459                     slave_ops->ndo_vlan_rx_register) {
460                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
461                 }
462         }
463 }
464
465 /**
466  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
467  * @bond_dev: bonding net device that got called
468  * @vid: vlan id being added
469  */
470 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
471 {
472         struct bonding *bond = netdev_priv(bond_dev);
473         struct slave *slave;
474         int i, res;
475
476         bond_for_each_slave(bond, slave, i) {
477                 struct net_device *slave_dev = slave->dev;
478                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
479
480                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
481                     slave_ops->ndo_vlan_rx_add_vid) {
482                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
483                 }
484         }
485
486         res = bond_add_vlan(bond, vid);
487         if (res) {
488                 pr_err(DRV_NAME
489                        ": %s: Error: Failed to add vlan id %d\n",
490                        bond_dev->name, vid);
491         }
492 }
493
494 /**
495  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
496  * @bond_dev: bonding net device that got called
497  * @vid: vlan id being removed
498  */
499 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
500 {
501         struct bonding *bond = netdev_priv(bond_dev);
502         struct slave *slave;
503         struct net_device *vlan_dev;
504         int i, res;
505
506         bond_for_each_slave(bond, slave, i) {
507                 struct net_device *slave_dev = slave->dev;
508                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
509
510                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
511                     slave_ops->ndo_vlan_rx_kill_vid) {
512                         /* Save and then restore vlan_dev in the grp array,
513                          * since the slave's driver might clear it.
514                          */
515                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
516                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
517                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
518                 }
519         }
520
521         res = bond_del_vlan(bond, vid);
522         if (res) {
523                 pr_err(DRV_NAME
524                        ": %s: Error: Failed to remove vlan id %d\n",
525                        bond_dev->name, vid);
526         }
527 }
528
529 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
530 {
531         struct vlan_entry *vlan;
532         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
533
534         write_lock_bh(&bond->lock);
535
536         if (list_empty(&bond->vlan_list))
537                 goto out;
538
539         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
540             slave_ops->ndo_vlan_rx_register)
541                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
542
543         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
544             !(slave_ops->ndo_vlan_rx_add_vid))
545                 goto out;
546
547         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
548                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
549
550 out:
551         write_unlock_bh(&bond->lock);
552 }
553
554 static void bond_del_vlans_from_slave(struct bonding *bond,
555                                       struct net_device *slave_dev)
556 {
557         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
558         struct vlan_entry *vlan;
559         struct net_device *vlan_dev;
560
561         write_lock_bh(&bond->lock);
562
563         if (list_empty(&bond->vlan_list))
564                 goto out;
565
566         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
567             !(slave_ops->ndo_vlan_rx_kill_vid))
568                 goto unreg;
569
570         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
571                 /* Save and then restore vlan_dev in the grp array,
572                  * since the slave's driver might clear it.
573                  */
574                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
575                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
576                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
577         }
578
579 unreg:
580         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
581             slave_ops->ndo_vlan_rx_register)
582                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
583
584 out:
585         write_unlock_bh(&bond->lock);
586 }
587
588 /*------------------------------- Link status -------------------------------*/
589
590 /*
591  * Set the carrier state for the master according to the state of its
592  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
593  * do special 802.3ad magic.
594  *
595  * Returns zero if carrier state does not change, nonzero if it does.
596  */
597 static int bond_set_carrier(struct bonding *bond)
598 {
599         struct slave *slave;
600         int i;
601
602         if (bond->slave_cnt == 0)
603                 goto down;
604
605         if (bond->params.mode == BOND_MODE_8023AD)
606                 return bond_3ad_set_carrier(bond);
607
608         bond_for_each_slave(bond, slave, i) {
609                 if (slave->link == BOND_LINK_UP) {
610                         if (!netif_carrier_ok(bond->dev)) {
611                                 netif_carrier_on(bond->dev);
612                                 return 1;
613                         }
614                         return 0;
615                 }
616         }
617
618 down:
619         if (netif_carrier_ok(bond->dev)) {
620                 netif_carrier_off(bond->dev);
621                 return 1;
622         }
623         return 0;
624 }
625
626 /*
627  * Get link speed and duplex from the slave's base driver
628  * using ethtool. If for some reason the call fails or the
629  * values are invalid, fake speed and duplex to 100/Full
630  * and return error.
631  */
632 static int bond_update_speed_duplex(struct slave *slave)
633 {
634         struct net_device *slave_dev = slave->dev;
635         struct ethtool_cmd etool;
636         int res;
637
638         /* Fake speed and duplex */
639         slave->speed = SPEED_100;
640         slave->duplex = DUPLEX_FULL;
641
642         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
643                 return -1;
644
645         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
646         if (res < 0)
647                 return -1;
648
649         switch (etool.speed) {
650         case SPEED_10:
651         case SPEED_100:
652         case SPEED_1000:
653         case SPEED_10000:
654                 break;
655         default:
656                 return -1;
657         }
658
659         switch (etool.duplex) {
660         case DUPLEX_FULL:
661         case DUPLEX_HALF:
662                 break;
663         default:
664                 return -1;
665         }
666
667         slave->speed = etool.speed;
668         slave->duplex = etool.duplex;
669
670         return 0;
671 }
672
673 /*
674  * if <dev> supports MII link status reporting, check its link status.
675  *
676  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
677  * depending upon the setting of the use_carrier parameter.
678  *
679  * Return either BMSR_LSTATUS, meaning that the link is up (or we
680  * can't tell and just pretend it is), or 0, meaning that the link is
681  * down.
682  *
683  * If reporting is non-zero, instead of faking link up, return -1 if
684  * both ETHTOOL and MII ioctls fail (meaning the device does not
685  * support them).  If use_carrier is set, return whatever it says.
686  * It'd be nice if there was a good way to tell if a driver supports
687  * netif_carrier, but there really isn't.
688  */
689 static int bond_check_dev_link(struct bonding *bond,
690                                struct net_device *slave_dev, int reporting)
691 {
692         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
693         static int (*ioctl)(struct net_device *, struct ifreq *, int);
694         struct ifreq ifr;
695         struct mii_ioctl_data *mii;
696
697         if (bond->params.use_carrier)
698                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
699
700         /* Try to get link status using Ethtool first. */
701         if (slave_dev->ethtool_ops) {
702                 if (slave_dev->ethtool_ops->get_link) {
703                         u32 link;
704
705                         link = slave_dev->ethtool_ops->get_link(slave_dev);
706
707                         return link ? BMSR_LSTATUS : 0;
708                 }
709         }
710
711         /* Ethtool can't be used, fallback to MII ioctls. */
712         ioctl = slave_ops->ndo_do_ioctl;
713         if (ioctl) {
714                 /* TODO: set pointer to correct ioctl on a per team member */
715                 /*       bases to make this more efficient. that is, once  */
716                 /*       we determine the correct ioctl, we will always    */
717                 /*       call it and not the others for that team          */
718                 /*       member.                                           */
719
720                 /*
721                  * We cannot assume that SIOCGMIIPHY will also read a
722                  * register; not all network drivers (e.g., e100)
723                  * support that.
724                  */
725
726                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
727                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
728                 mii = if_mii(&ifr);
729                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
730                         mii->reg_num = MII_BMSR;
731                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
732                                 return mii->val_out & BMSR_LSTATUS;
733                 }
734         }
735
736         /*
737          * If reporting, report that either there's no dev->do_ioctl,
738          * or both SIOCGMIIREG and get_link failed (meaning that we
739          * cannot report link status).  If not reporting, pretend
740          * we're ok.
741          */
742         return reporting ? -1 : BMSR_LSTATUS;
743 }
744
745 /*----------------------------- Multicast list ------------------------------*/
746
747 /*
748  * Returns 0 if dmi1 and dmi2 are the same, non-0 otherwise
749  */
750 static inline int bond_is_dmi_same(const struct dev_mc_list *dmi1,
751                                    const struct dev_mc_list *dmi2)
752 {
753         return memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0 &&
754                         dmi1->dmi_addrlen == dmi2->dmi_addrlen;
755 }
756
757 /*
758  * returns dmi entry if found, NULL otherwise
759  */
760 static struct dev_mc_list *bond_mc_list_find_dmi(struct dev_mc_list *dmi,
761                                                  struct dev_mc_list *mc_list)
762 {
763         struct dev_mc_list *idmi;
764
765         for (idmi = mc_list; idmi; idmi = idmi->next) {
766                 if (bond_is_dmi_same(dmi, idmi))
767                         return idmi;
768         }
769
770         return NULL;
771 }
772
773 /*
774  * Push the promiscuity flag down to appropriate slaves
775  */
776 static int bond_set_promiscuity(struct bonding *bond, int inc)
777 {
778         int err = 0;
779         if (USES_PRIMARY(bond->params.mode)) {
780                 /* write lock already acquired */
781                 if (bond->curr_active_slave) {
782                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
783                                                   inc);
784                 }
785         } else {
786                 struct slave *slave;
787                 int i;
788                 bond_for_each_slave(bond, slave, i) {
789                         err = dev_set_promiscuity(slave->dev, inc);
790                         if (err)
791                                 return err;
792                 }
793         }
794         return err;
795 }
796
797 /*
798  * Push the allmulti flag down to all slaves
799  */
800 static int bond_set_allmulti(struct bonding *bond, int inc)
801 {
802         int err = 0;
803         if (USES_PRIMARY(bond->params.mode)) {
804                 /* write lock already acquired */
805                 if (bond->curr_active_slave) {
806                         err = dev_set_allmulti(bond->curr_active_slave->dev,
807                                                inc);
808                 }
809         } else {
810                 struct slave *slave;
811                 int i;
812                 bond_for_each_slave(bond, slave, i) {
813                         err = dev_set_allmulti(slave->dev, inc);
814                         if (err)
815                                 return err;
816                 }
817         }
818         return err;
819 }
820
821 /*
822  * Add a Multicast address to slaves
823  * according to mode
824  */
825 static void bond_mc_add(struct bonding *bond, void *addr, int alen)
826 {
827         if (USES_PRIMARY(bond->params.mode)) {
828                 /* write lock already acquired */
829                 if (bond->curr_active_slave)
830                         dev_mc_add(bond->curr_active_slave->dev, addr, alen, 0);
831         } else {
832                 struct slave *slave;
833                 int i;
834
835                 bond_for_each_slave(bond, slave, i)
836                         dev_mc_add(slave->dev, addr, alen, 0);
837         }
838 }
839
840 /*
841  * Remove a multicast address from slave
842  * according to mode
843  */
844 static void bond_mc_delete(struct bonding *bond, void *addr, int alen)
845 {
846         if (USES_PRIMARY(bond->params.mode)) {
847                 /* write lock already acquired */
848                 if (bond->curr_active_slave)
849                         dev_mc_delete(bond->curr_active_slave->dev, addr,
850                                       alen, 0);
851         } else {
852                 struct slave *slave;
853                 int i;
854                 bond_for_each_slave(bond, slave, i) {
855                         dev_mc_delete(slave->dev, addr, alen, 0);
856                 }
857         }
858 }
859
860
861 /*
862  * Retrieve the list of registered multicast addresses for the bonding
863  * device and retransmit an IGMP JOIN request to the current active
864  * slave.
865  */
866 static void bond_resend_igmp_join_requests(struct bonding *bond)
867 {
868         struct in_device *in_dev;
869         struct ip_mc_list *im;
870
871         rcu_read_lock();
872         in_dev = __in_dev_get_rcu(bond->dev);
873         if (in_dev) {
874                 for (im = in_dev->mc_list; im; im = im->next)
875                         ip_mc_rejoin_group(im);
876         }
877
878         rcu_read_unlock();
879 }
880
881 /*
882  * Totally destroys the mc_list in bond
883  */
884 static void bond_mc_list_destroy(struct bonding *bond)
885 {
886         struct dev_mc_list *dmi;
887
888         dmi = bond->mc_list;
889         while (dmi) {
890                 bond->mc_list = dmi->next;
891                 kfree(dmi);
892                 dmi = bond->mc_list;
893         }
894
895         bond->mc_list = NULL;
896 }
897
898 /*
899  * Copy all the Multicast addresses from src to the bonding device dst
900  */
901 static int bond_mc_list_copy(struct dev_mc_list *mc_list, struct bonding *bond,
902                              gfp_t gfp_flag)
903 {
904         struct dev_mc_list *dmi, *new_dmi;
905
906         for (dmi = mc_list; dmi; dmi = dmi->next) {
907                 new_dmi = kmalloc(sizeof(struct dev_mc_list), gfp_flag);
908
909                 if (!new_dmi) {
910                         /* FIXME: Potential memory leak !!! */
911                         return -ENOMEM;
912                 }
913
914                 new_dmi->next = bond->mc_list;
915                 bond->mc_list = new_dmi;
916                 new_dmi->dmi_addrlen = dmi->dmi_addrlen;
917                 memcpy(new_dmi->dmi_addr, dmi->dmi_addr, dmi->dmi_addrlen);
918                 new_dmi->dmi_users = dmi->dmi_users;
919                 new_dmi->dmi_gusers = dmi->dmi_gusers;
920         }
921
922         return 0;
923 }
924
925 /*
926  * flush all members of flush->mc_list from device dev->mc_list
927  */
928 static void bond_mc_list_flush(struct net_device *bond_dev,
929                                struct net_device *slave_dev)
930 {
931         struct bonding *bond = netdev_priv(bond_dev);
932         struct dev_mc_list *dmi;
933
934         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
935                 dev_mc_delete(slave_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
936
937         if (bond->params.mode == BOND_MODE_8023AD) {
938                 /* del lacpdu mc addr from mc list */
939                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
940
941                 dev_mc_delete(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
942         }
943 }
944
945 /*--------------------------- Active slave change ---------------------------*/
946
947 /*
948  * Update the mc list and multicast-related flags for the new and
949  * old active slaves (if any) according to the multicast mode, and
950  * promiscuous flags unconditionally.
951  */
952 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
953                          struct slave *old_active)
954 {
955         struct dev_mc_list *dmi;
956
957         if (!USES_PRIMARY(bond->params.mode))
958                 /* nothing to do -  mc list is already up-to-date on
959                  * all slaves
960                  */
961                 return;
962
963         if (old_active) {
964                 if (bond->dev->flags & IFF_PROMISC)
965                         dev_set_promiscuity(old_active->dev, -1);
966
967                 if (bond->dev->flags & IFF_ALLMULTI)
968                         dev_set_allmulti(old_active->dev, -1);
969
970                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
971                         dev_mc_delete(old_active->dev, dmi->dmi_addr,
972                                       dmi->dmi_addrlen, 0);
973         }
974
975         if (new_active) {
976                 /* FIXME: Signal errors upstream. */
977                 if (bond->dev->flags & IFF_PROMISC)
978                         dev_set_promiscuity(new_active->dev, 1);
979
980                 if (bond->dev->flags & IFF_ALLMULTI)
981                         dev_set_allmulti(new_active->dev, 1);
982
983                 for (dmi = bond->dev->mc_list; dmi; dmi = dmi->next)
984                         dev_mc_add(new_active->dev, dmi->dmi_addr,
985                                    dmi->dmi_addrlen, 0);
986                 bond_resend_igmp_join_requests(bond);
987         }
988 }
989
990 /*
991  * bond_do_fail_over_mac
992  *
993  * Perform special MAC address swapping for fail_over_mac settings
994  *
995  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
996  */
997 static void bond_do_fail_over_mac(struct bonding *bond,
998                                   struct slave *new_active,
999                                   struct slave *old_active)
1000         __releases(&bond->curr_slave_lock)
1001         __releases(&bond->lock)
1002         __acquires(&bond->lock)
1003         __acquires(&bond->curr_slave_lock)
1004 {
1005         u8 tmp_mac[ETH_ALEN];
1006         struct sockaddr saddr;
1007         int rv;
1008
1009         switch (bond->params.fail_over_mac) {
1010         case BOND_FOM_ACTIVE:
1011                 if (new_active)
1012                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
1013                                new_active->dev->addr_len);
1014                 break;
1015         case BOND_FOM_FOLLOW:
1016                 /*
1017                  * if new_active && old_active, swap them
1018                  * if just old_active, do nothing (going to no active slave)
1019                  * if just new_active, set new_active to bond's MAC
1020                  */
1021                 if (!new_active)
1022                         return;
1023
1024                 write_unlock_bh(&bond->curr_slave_lock);
1025                 read_unlock(&bond->lock);
1026
1027                 if (old_active) {
1028                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1029                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1030                                ETH_ALEN);
1031                         saddr.sa_family = new_active->dev->type;
1032                 } else {
1033                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1034                         saddr.sa_family = bond->dev->type;
1035                 }
1036
1037                 rv = dev_set_mac_address(new_active->dev, &saddr);
1038                 if (rv) {
1039                         pr_err(DRV_NAME
1040                                ": %s: Error %d setting MAC of slave %s\n",
1041                                bond->dev->name, -rv, new_active->dev->name);
1042                         goto out;
1043                 }
1044
1045                 if (!old_active)
1046                         goto out;
1047
1048                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1049                 saddr.sa_family = old_active->dev->type;
1050
1051                 rv = dev_set_mac_address(old_active->dev, &saddr);
1052                 if (rv)
1053                         pr_err(DRV_NAME
1054                                ": %s: Error %d setting MAC of slave %s\n",
1055                                bond->dev->name, -rv, new_active->dev->name);
1056 out:
1057                 read_lock(&bond->lock);
1058                 write_lock_bh(&bond->curr_slave_lock);
1059                 break;
1060         default:
1061                 pr_err(DRV_NAME
1062                        ": %s: bond_do_fail_over_mac impossible: bad policy %d\n",
1063                        bond->dev->name, bond->params.fail_over_mac);
1064                 break;
1065         }
1066
1067 }
1068
1069
1070 /**
1071  * find_best_interface - select the best available slave to be the active one
1072  * @bond: our bonding struct
1073  *
1074  * Warning: Caller must hold curr_slave_lock for writing.
1075  */
1076 static struct slave *bond_find_best_slave(struct bonding *bond)
1077 {
1078         struct slave *new_active, *old_active;
1079         struct slave *bestslave = NULL;
1080         int mintime = bond->params.updelay;
1081         int i;
1082
1083         new_active = old_active = bond->curr_active_slave;
1084
1085         if (!new_active) { /* there were no active slaves left */
1086                 if (bond->slave_cnt > 0)   /* found one slave */
1087                         new_active = bond->first_slave;
1088                 else
1089                         return NULL; /* still no slave, return NULL */
1090         }
1091
1092         /*
1093          * first try the primary link; if arping, a link must tx/rx
1094          * traffic before it can be considered the curr_active_slave.
1095          * also, we would skip slaves between the curr_active_slave
1096          * and primary_slave that may be up and able to arp
1097          */
1098         if ((bond->primary_slave) &&
1099             (!bond->params.arp_interval) &&
1100             (IS_UP(bond->primary_slave->dev))) {
1101                 new_active = bond->primary_slave;
1102         }
1103
1104         /* remember where to stop iterating over the slaves */
1105         old_active = new_active;
1106
1107         bond_for_each_slave_from(bond, new_active, i, old_active) {
1108                 if (IS_UP(new_active->dev)) {
1109                         if (new_active->link == BOND_LINK_UP) {
1110                                 return new_active;
1111                         } else if (new_active->link == BOND_LINK_BACK) {
1112                                 /* link up, but waiting for stabilization */
1113                                 if (new_active->delay < mintime) {
1114                                         mintime = new_active->delay;
1115                                         bestslave = new_active;
1116                                 }
1117                         }
1118                 }
1119         }
1120
1121         return bestslave;
1122 }
1123
1124 /**
1125  * change_active_interface - change the active slave into the specified one
1126  * @bond: our bonding struct
1127  * @new: the new slave to make the active one
1128  *
1129  * Set the new slave to the bond's settings and unset them on the old
1130  * curr_active_slave.
1131  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1132  *
1133  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1134  * because it is apparently the best available slave we have, even though its
1135  * updelay hasn't timed out yet.
1136  *
1137  * If new_active is not NULL, caller must hold bond->lock for read and
1138  * curr_slave_lock for write_bh.
1139  */
1140 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1141 {
1142         struct slave *old_active = bond->curr_active_slave;
1143
1144         if (old_active == new_active)
1145                 return;
1146
1147         if (new_active) {
1148                 new_active->jiffies = jiffies;
1149
1150                 if (new_active->link == BOND_LINK_BACK) {
1151                         if (USES_PRIMARY(bond->params.mode)) {
1152                                 pr_info(DRV_NAME
1153                                        ": %s: making interface %s the new "
1154                                        "active one %d ms earlier.\n",
1155                                        bond->dev->name, new_active->dev->name,
1156                                        (bond->params.updelay - new_active->delay) * bond->params.miimon);
1157                         }
1158
1159                         new_active->delay = 0;
1160                         new_active->link = BOND_LINK_UP;
1161
1162                         if (bond->params.mode == BOND_MODE_8023AD)
1163                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1164
1165                         if (bond_is_lb(bond))
1166                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1167                 } else {
1168                         if (USES_PRIMARY(bond->params.mode)) {
1169                                 pr_info(DRV_NAME
1170                                        ": %s: making interface %s the new "
1171                                        "active one.\n",
1172                                        bond->dev->name, new_active->dev->name);
1173                         }
1174                 }
1175         }
1176
1177         if (USES_PRIMARY(bond->params.mode))
1178                 bond_mc_swap(bond, new_active, old_active);
1179
1180         if (bond_is_lb(bond)) {
1181                 bond_alb_handle_active_change(bond, new_active);
1182                 if (old_active)
1183                         bond_set_slave_inactive_flags(old_active);
1184                 if (new_active)
1185                         bond_set_slave_active_flags(new_active);
1186         } else {
1187                 bond->curr_active_slave = new_active;
1188         }
1189
1190         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1191                 if (old_active)
1192                         bond_set_slave_inactive_flags(old_active);
1193
1194                 if (new_active) {
1195                         bond_set_slave_active_flags(new_active);
1196
1197                         if (bond->params.fail_over_mac)
1198                                 bond_do_fail_over_mac(bond, new_active,
1199                                                       old_active);
1200
1201                         bond->send_grat_arp = bond->params.num_grat_arp;
1202                         bond_send_gratuitous_arp(bond);
1203
1204                         bond->send_unsol_na = bond->params.num_unsol_na;
1205                         bond_send_unsolicited_na(bond);
1206
1207                         write_unlock_bh(&bond->curr_slave_lock);
1208                         read_unlock(&bond->lock);
1209
1210                         netdev_bonding_change(bond->dev);
1211
1212                         read_lock(&bond->lock);
1213                         write_lock_bh(&bond->curr_slave_lock);
1214                 }
1215         }
1216 }
1217
1218 /**
1219  * bond_select_active_slave - select a new active slave, if needed
1220  * @bond: our bonding struct
1221  *
1222  * This functions should be called when one of the following occurs:
1223  * - The old curr_active_slave has been released or lost its link.
1224  * - The primary_slave has got its link back.
1225  * - A slave has got its link back and there's no old curr_active_slave.
1226  *
1227  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1228  */
1229 void bond_select_active_slave(struct bonding *bond)
1230 {
1231         struct slave *best_slave;
1232         int rv;
1233
1234         best_slave = bond_find_best_slave(bond);
1235         if (best_slave != bond->curr_active_slave) {
1236                 bond_change_active_slave(bond, best_slave);
1237                 rv = bond_set_carrier(bond);
1238                 if (!rv)
1239                         return;
1240
1241                 if (netif_carrier_ok(bond->dev)) {
1242                         pr_info(DRV_NAME
1243                                ": %s: first active interface up!\n",
1244                                bond->dev->name);
1245                 } else {
1246                         pr_info(DRV_NAME ": %s: "
1247                                "now running without any active interface !\n",
1248                                bond->dev->name);
1249                 }
1250         }
1251 }
1252
1253 /*--------------------------- slave list handling ---------------------------*/
1254
1255 /*
1256  * This function attaches the slave to the end of list.
1257  *
1258  * bond->lock held for writing by caller.
1259  */
1260 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1261 {
1262         if (bond->first_slave == NULL) { /* attaching the first slave */
1263                 new_slave->next = new_slave;
1264                 new_slave->prev = new_slave;
1265                 bond->first_slave = new_slave;
1266         } else {
1267                 new_slave->next = bond->first_slave;
1268                 new_slave->prev = bond->first_slave->prev;
1269                 new_slave->next->prev = new_slave;
1270                 new_slave->prev->next = new_slave;
1271         }
1272
1273         bond->slave_cnt++;
1274 }
1275
1276 /*
1277  * This function detaches the slave from the list.
1278  * WARNING: no check is made to verify if the slave effectively
1279  * belongs to <bond>.
1280  * Nothing is freed on return, structures are just unchained.
1281  * If any slave pointer in bond was pointing to <slave>,
1282  * it should be changed by the calling function.
1283  *
1284  * bond->lock held for writing by caller.
1285  */
1286 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1287 {
1288         if (slave->next)
1289                 slave->next->prev = slave->prev;
1290
1291         if (slave->prev)
1292                 slave->prev->next = slave->next;
1293
1294         if (bond->first_slave == slave) { /* slave is the first slave */
1295                 if (bond->slave_cnt > 1) { /* there are more slave */
1296                         bond->first_slave = slave->next;
1297                 } else {
1298                         bond->first_slave = NULL; /* slave was the last one */
1299                 }
1300         }
1301
1302         slave->next = NULL;
1303         slave->prev = NULL;
1304         bond->slave_cnt--;
1305 }
1306
1307 /*---------------------------------- IOCTL ----------------------------------*/
1308
1309 static int bond_sethwaddr(struct net_device *bond_dev,
1310                           struct net_device *slave_dev)
1311 {
1312         pr_debug("bond_dev=%p\n", bond_dev);
1313         pr_debug("slave_dev=%p\n", slave_dev);
1314         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1315         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1316         return 0;
1317 }
1318
1319 #define BOND_VLAN_FEATURES \
1320         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1321          NETIF_F_HW_VLAN_FILTER)
1322
1323 /*
1324  * Compute the common dev->feature set available to all slaves.  Some
1325  * feature bits are managed elsewhere, so preserve those feature bits
1326  * on the master device.
1327  */
1328 static int bond_compute_features(struct bonding *bond)
1329 {
1330         struct slave *slave;
1331         struct net_device *bond_dev = bond->dev;
1332         unsigned long features = bond_dev->features;
1333         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1334                                                 bond_dev->hard_header_len);
1335         int i;
1336
1337         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1338         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1339
1340         if (!bond->first_slave)
1341                 goto done;
1342
1343         features &= ~NETIF_F_ONE_FOR_ALL;
1344
1345         bond_for_each_slave(bond, slave, i) {
1346                 features = netdev_increment_features(features,
1347                                                      slave->dev->features,
1348                                                      NETIF_F_ONE_FOR_ALL);
1349                 if (slave->dev->hard_header_len > max_hard_header_len)
1350                         max_hard_header_len = slave->dev->hard_header_len;
1351         }
1352
1353 done:
1354         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1355         bond_dev->features = netdev_fix_features(features, NULL);
1356         bond_dev->hard_header_len = max_hard_header_len;
1357
1358         return 0;
1359 }
1360
1361 static void bond_setup_by_slave(struct net_device *bond_dev,
1362                                 struct net_device *slave_dev)
1363 {
1364         struct bonding *bond = netdev_priv(bond_dev);
1365
1366         bond_dev->header_ops        = slave_dev->header_ops;
1367
1368         bond_dev->type              = slave_dev->type;
1369         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1370         bond_dev->addr_len          = slave_dev->addr_len;
1371
1372         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1373                 slave_dev->addr_len);
1374         bond->setup_by_slave = 1;
1375 }
1376
1377 /* enslave device <slave> to bond device <master> */
1378 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1379 {
1380         struct bonding *bond = netdev_priv(bond_dev);
1381         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1382         struct slave *new_slave = NULL;
1383         struct dev_mc_list *dmi;
1384         struct sockaddr addr;
1385         int link_reporting;
1386         int old_features = bond_dev->features;
1387         int res = 0;
1388
1389         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1390                 slave_ops->ndo_do_ioctl == NULL) {
1391                 pr_warning(DRV_NAME
1392                        ": %s: Warning: no link monitoring support for %s\n",
1393                        bond_dev->name, slave_dev->name);
1394         }
1395
1396         /* bond must be initialized by bond_open() before enslaving */
1397         if (!(bond_dev->flags & IFF_UP)) {
1398                 pr_warning(DRV_NAME
1399                         " %s: master_dev is not up in bond_enslave\n",
1400                         bond_dev->name);
1401         }
1402
1403         /* already enslaved */
1404         if (slave_dev->flags & IFF_SLAVE) {
1405                 pr_debug("Error, Device was already enslaved\n");
1406                 return -EBUSY;
1407         }
1408
1409         /* vlan challenged mutual exclusion */
1410         /* no need to lock since we're protected by rtnl_lock */
1411         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1412                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1413                 if (!list_empty(&bond->vlan_list)) {
1414                         pr_err(DRV_NAME
1415                                ": %s: Error: cannot enslave VLAN "
1416                                "challenged slave %s on VLAN enabled "
1417                                "bond %s\n", bond_dev->name, slave_dev->name,
1418                                bond_dev->name);
1419                         return -EPERM;
1420                 } else {
1421                         pr_warning(DRV_NAME
1422                                ": %s: Warning: enslaved VLAN challenged "
1423                                "slave %s. Adding VLANs will be blocked as "
1424                                "long as %s is part of bond %s\n",
1425                                bond_dev->name, slave_dev->name, slave_dev->name,
1426                                bond_dev->name);
1427                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1428                 }
1429         } else {
1430                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1431                 if (bond->slave_cnt == 0) {
1432                         /* First slave, and it is not VLAN challenged,
1433                          * so remove the block of adding VLANs over the bond.
1434                          */
1435                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1436                 }
1437         }
1438
1439         /*
1440          * Old ifenslave binaries are no longer supported.  These can
1441          * be identified with moderate accuracy by the state of the slave:
1442          * the current ifenslave will set the interface down prior to
1443          * enslaving it; the old ifenslave will not.
1444          */
1445         if ((slave_dev->flags & IFF_UP)) {
1446                 pr_err(DRV_NAME ": %s is up. "
1447                        "This may be due to an out of date ifenslave.\n",
1448                        slave_dev->name);
1449                 res = -EPERM;
1450                 goto err_undo_flags;
1451         }
1452
1453         /* set bonding device ether type by slave - bonding netdevices are
1454          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1455          * there is a need to override some of the type dependent attribs/funcs.
1456          *
1457          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1458          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1459          */
1460         if (bond->slave_cnt == 0) {
1461                 if (slave_dev->type != ARPHRD_ETHER)
1462                         bond_setup_by_slave(bond_dev, slave_dev);
1463         } else if (bond_dev->type != slave_dev->type) {
1464                 pr_err(DRV_NAME ": %s ether type (%d) is different "
1465                         "from other slaves (%d), can not enslave it.\n",
1466                         slave_dev->name,
1467                         slave_dev->type, bond_dev->type);
1468                         res = -EINVAL;
1469                         goto err_undo_flags;
1470         }
1471
1472         if (slave_ops->ndo_set_mac_address == NULL) {
1473                 if (bond->slave_cnt == 0) {
1474                         pr_warning(DRV_NAME
1475                                ": %s: Warning: The first slave device "
1476                                "specified does not support setting the MAC "
1477                                "address. Setting fail_over_mac to active.",
1478                                bond_dev->name);
1479                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1480                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1481                         pr_err(DRV_NAME
1482                                 ": %s: Error: The slave device specified "
1483                                 "does not support setting the MAC address, "
1484                                 "but fail_over_mac is not set to active.\n"
1485                                 , bond_dev->name);
1486                         res = -EOPNOTSUPP;
1487                         goto err_undo_flags;
1488                 }
1489         }
1490
1491         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1492         if (!new_slave) {
1493                 res = -ENOMEM;
1494                 goto err_undo_flags;
1495         }
1496
1497         /* save slave's original flags before calling
1498          * netdev_set_master and dev_open
1499          */
1500         new_slave->original_flags = slave_dev->flags;
1501
1502         /*
1503          * Save slave's original ("permanent") mac address for modes
1504          * that need it, and for restoring it upon release, and then
1505          * set it to the master's address
1506          */
1507         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1508
1509         if (!bond->params.fail_over_mac) {
1510                 /*
1511                  * Set slave to master's mac address.  The application already
1512                  * set the master's mac address to that of the first slave
1513                  */
1514                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1515                 addr.sa_family = slave_dev->type;
1516                 res = dev_set_mac_address(slave_dev, &addr);
1517                 if (res) {
1518                         pr_debug("Error %d calling set_mac_address\n", res);
1519                         goto err_free;
1520                 }
1521         }
1522
1523         res = netdev_set_master(slave_dev, bond_dev);
1524         if (res) {
1525                 pr_debug("Error %d calling netdev_set_master\n", res);
1526                 goto err_restore_mac;
1527         }
1528         /* open the slave since the application closed it */
1529         res = dev_open(slave_dev);
1530         if (res) {
1531                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1532                 goto err_unset_master;
1533         }
1534
1535         new_slave->dev = slave_dev;
1536         slave_dev->priv_flags |= IFF_BONDING;
1537
1538         if (bond_is_lb(bond)) {
1539                 /* bond_alb_init_slave() must be called before all other stages since
1540                  * it might fail and we do not want to have to undo everything
1541                  */
1542                 res = bond_alb_init_slave(bond, new_slave);
1543                 if (res)
1544                         goto err_close;
1545         }
1546
1547         /* If the mode USES_PRIMARY, then the new slave gets the
1548          * master's promisc (and mc) settings only if it becomes the
1549          * curr_active_slave, and that is taken care of later when calling
1550          * bond_change_active()
1551          */
1552         if (!USES_PRIMARY(bond->params.mode)) {
1553                 /* set promiscuity level to new slave */
1554                 if (bond_dev->flags & IFF_PROMISC) {
1555                         res = dev_set_promiscuity(slave_dev, 1);
1556                         if (res)
1557                                 goto err_close;
1558                 }
1559
1560                 /* set allmulti level to new slave */
1561                 if (bond_dev->flags & IFF_ALLMULTI) {
1562                         res = dev_set_allmulti(slave_dev, 1);
1563                         if (res)
1564                                 goto err_close;
1565                 }
1566
1567                 netif_addr_lock_bh(bond_dev);
1568                 /* upload master's mc_list to new slave */
1569                 for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next)
1570                         dev_mc_add(slave_dev, dmi->dmi_addr,
1571                                    dmi->dmi_addrlen, 0);
1572                 netif_addr_unlock_bh(bond_dev);
1573         }
1574
1575         if (bond->params.mode == BOND_MODE_8023AD) {
1576                 /* add lacpdu mc addr to mc list */
1577                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1578
1579                 dev_mc_add(slave_dev, lacpdu_multicast, ETH_ALEN, 0);
1580         }
1581
1582         bond_add_vlans_on_slave(bond, slave_dev);
1583
1584         write_lock_bh(&bond->lock);
1585
1586         bond_attach_slave(bond, new_slave);
1587
1588         new_slave->delay = 0;
1589         new_slave->link_failure_count = 0;
1590
1591         bond_compute_features(bond);
1592
1593         write_unlock_bh(&bond->lock);
1594
1595         read_lock(&bond->lock);
1596
1597         new_slave->last_arp_rx = jiffies;
1598
1599         if (bond->params.miimon && !bond->params.use_carrier) {
1600                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1601
1602                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1603                         /*
1604                          * miimon is set but a bonded network driver
1605                          * does not support ETHTOOL/MII and
1606                          * arp_interval is not set.  Note: if
1607                          * use_carrier is enabled, we will never go
1608                          * here (because netif_carrier is always
1609                          * supported); thus, we don't need to change
1610                          * the messages for netif_carrier.
1611                          */
1612                         pr_warning(DRV_NAME
1613                                ": %s: Warning: MII and ETHTOOL support not "
1614                                "available for interface %s, and "
1615                                "arp_interval/arp_ip_target module parameters "
1616                                "not specified, thus bonding will not detect "
1617                                "link failures! see bonding.txt for details.\n",
1618                                bond_dev->name, slave_dev->name);
1619                 } else if (link_reporting == -1) {
1620                         /* unable get link status using mii/ethtool */
1621                         pr_warning(DRV_NAME
1622                                ": %s: Warning: can't get link status from "
1623                                "interface %s; the network driver associated "
1624                                "with this interface does not support MII or "
1625                                "ETHTOOL link status reporting, thus miimon "
1626                                "has no effect on this interface.\n",
1627                                bond_dev->name, slave_dev->name);
1628                 }
1629         }
1630
1631         /* check for initial state */
1632         if (!bond->params.miimon ||
1633             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1634                 if (bond->params.updelay) {
1635                         pr_debug("Initial state of slave_dev is "
1636                                 "BOND_LINK_BACK\n");
1637                         new_slave->link  = BOND_LINK_BACK;
1638                         new_slave->delay = bond->params.updelay;
1639                 } else {
1640                         pr_debug("Initial state of slave_dev is "
1641                                 "BOND_LINK_UP\n");
1642                         new_slave->link  = BOND_LINK_UP;
1643                 }
1644                 new_slave->jiffies = jiffies;
1645         } else {
1646                 pr_debug("Initial state of slave_dev is "
1647                         "BOND_LINK_DOWN\n");
1648                 new_slave->link  = BOND_LINK_DOWN;
1649         }
1650
1651         if (bond_update_speed_duplex(new_slave) &&
1652             (new_slave->link != BOND_LINK_DOWN)) {
1653                 pr_warning(DRV_NAME
1654                        ": %s: Warning: failed to get speed and duplex from %s, "
1655                        "assumed to be 100Mb/sec and Full.\n",
1656                        bond_dev->name, new_slave->dev->name);
1657
1658                 if (bond->params.mode == BOND_MODE_8023AD) {
1659                         pr_warning(DRV_NAME
1660                                ": %s: Warning: Operation of 802.3ad mode requires ETHTOOL "
1661                                "support in base driver for proper aggregator "
1662                                "selection.\n", bond_dev->name);
1663                 }
1664         }
1665
1666         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1667                 /* if there is a primary slave, remember it */
1668                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0)
1669                         bond->primary_slave = new_slave;
1670         }
1671
1672         write_lock_bh(&bond->curr_slave_lock);
1673
1674         switch (bond->params.mode) {
1675         case BOND_MODE_ACTIVEBACKUP:
1676                 bond_set_slave_inactive_flags(new_slave);
1677                 bond_select_active_slave(bond);
1678                 break;
1679         case BOND_MODE_8023AD:
1680                 /* in 802.3ad mode, the internal mechanism
1681                  * will activate the slaves in the selected
1682                  * aggregator
1683                  */
1684                 bond_set_slave_inactive_flags(new_slave);
1685                 /* if this is the first slave */
1686                 if (bond->slave_cnt == 1) {
1687                         SLAVE_AD_INFO(new_slave).id = 1;
1688                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1689                          * can be called only after the mac address of the bond is set
1690                          */
1691                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1692                                             bond->params.lacp_fast);
1693                 } else {
1694                         SLAVE_AD_INFO(new_slave).id =
1695                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1696                 }
1697
1698                 bond_3ad_bind_slave(new_slave);
1699                 break;
1700         case BOND_MODE_TLB:
1701         case BOND_MODE_ALB:
1702                 new_slave->state = BOND_STATE_ACTIVE;
1703                 bond_set_slave_inactive_flags(new_slave);
1704                 bond_select_active_slave(bond);
1705                 break;
1706         default:
1707                 pr_debug("This slave is always active in trunk mode\n");
1708
1709                 /* always active in trunk mode */
1710                 new_slave->state = BOND_STATE_ACTIVE;
1711
1712                 /* In trunking mode there is little meaning to curr_active_slave
1713                  * anyway (it holds no special properties of the bond device),
1714                  * so we can change it without calling change_active_interface()
1715                  */
1716                 if (!bond->curr_active_slave)
1717                         bond->curr_active_slave = new_slave;
1718
1719                 break;
1720         } /* switch(bond_mode) */
1721
1722         write_unlock_bh(&bond->curr_slave_lock);
1723
1724         bond_set_carrier(bond);
1725
1726         read_unlock(&bond->lock);
1727
1728         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1729         if (res)
1730                 goto err_close;
1731
1732         pr_info(DRV_NAME
1733                ": %s: enslaving %s as a%s interface with a%s link.\n",
1734                bond_dev->name, slave_dev->name,
1735                new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1736                new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1737
1738         /* enslave is successful */
1739         return 0;
1740
1741 /* Undo stages on error */
1742 err_close:
1743         dev_close(slave_dev);
1744
1745 err_unset_master:
1746         netdev_set_master(slave_dev, NULL);
1747
1748 err_restore_mac:
1749         if (!bond->params.fail_over_mac) {
1750                 /* XXX TODO - fom follow mode needs to change master's
1751                  * MAC if this slave's MAC is in use by the bond, or at
1752                  * least print a warning.
1753                  */
1754                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1755                 addr.sa_family = slave_dev->type;
1756                 dev_set_mac_address(slave_dev, &addr);
1757         }
1758
1759 err_free:
1760         kfree(new_slave);
1761
1762 err_undo_flags:
1763         bond_dev->features = old_features;
1764
1765         return res;
1766 }
1767
1768 /*
1769  * Try to release the slave device <slave> from the bond device <master>
1770  * It is legal to access curr_active_slave without a lock because all the function
1771  * is write-locked.
1772  *
1773  * The rules for slave state should be:
1774  *   for Active/Backup:
1775  *     Active stays on all backups go down
1776  *   for Bonded connections:
1777  *     The first up interface should be left on and all others downed.
1778  */
1779 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1780 {
1781         struct bonding *bond = netdev_priv(bond_dev);
1782         struct slave *slave, *oldcurrent;
1783         struct sockaddr addr;
1784         int mac_addr_differ;
1785
1786         /* slave is not a slave or master is not master of this slave */
1787         if (!(slave_dev->flags & IFF_SLAVE) ||
1788             (slave_dev->master != bond_dev)) {
1789                 pr_err(DRV_NAME
1790                        ": %s: Error: cannot release %s.\n",
1791                        bond_dev->name, slave_dev->name);
1792                 return -EINVAL;
1793         }
1794
1795         write_lock_bh(&bond->lock);
1796
1797         slave = bond_get_slave_by_dev(bond, slave_dev);
1798         if (!slave) {
1799                 /* not a slave of this bond */
1800                 pr_info(DRV_NAME
1801                        ": %s: %s not enslaved\n",
1802                        bond_dev->name, slave_dev->name);
1803                 write_unlock_bh(&bond->lock);
1804                 return -EINVAL;
1805         }
1806
1807         if (!bond->params.fail_over_mac) {
1808                 mac_addr_differ = memcmp(bond_dev->dev_addr, slave->perm_hwaddr,
1809                                          ETH_ALEN);
1810                 if (!mac_addr_differ && (bond->slave_cnt > 1))
1811                         pr_warning(DRV_NAME
1812                                ": %s: Warning: the permanent HWaddr of %s - "
1813                                "%pM - is still in use by %s. "
1814                                "Set the HWaddr of %s to a different address "
1815                                "to avoid conflicts.\n",
1816                                bond_dev->name, slave_dev->name,
1817                                slave->perm_hwaddr,
1818                                bond_dev->name, slave_dev->name);
1819         }
1820
1821         /* Inform AD package of unbinding of slave. */
1822         if (bond->params.mode == BOND_MODE_8023AD) {
1823                 /* must be called before the slave is
1824                  * detached from the list
1825                  */
1826                 bond_3ad_unbind_slave(slave);
1827         }
1828
1829         pr_info(DRV_NAME
1830                ": %s: releasing %s interface %s\n",
1831                bond_dev->name,
1832                (slave->state == BOND_STATE_ACTIVE)
1833                ? "active" : "backup",
1834                slave_dev->name);
1835
1836         oldcurrent = bond->curr_active_slave;
1837
1838         bond->current_arp_slave = NULL;
1839
1840         /* release the slave from its bond */
1841         bond_detach_slave(bond, slave);
1842
1843         bond_compute_features(bond);
1844
1845         if (bond->primary_slave == slave)
1846                 bond->primary_slave = NULL;
1847
1848         if (oldcurrent == slave)
1849                 bond_change_active_slave(bond, NULL);
1850
1851         if (bond_is_lb(bond)) {
1852                 /* Must be called only after the slave has been
1853                  * detached from the list and the curr_active_slave
1854                  * has been cleared (if our_slave == old_current),
1855                  * but before a new active slave is selected.
1856                  */
1857                 write_unlock_bh(&bond->lock);
1858                 bond_alb_deinit_slave(bond, slave);
1859                 write_lock_bh(&bond->lock);
1860         }
1861
1862         if (oldcurrent == slave) {
1863                 /*
1864                  * Note that we hold RTNL over this sequence, so there
1865                  * is no concern that another slave add/remove event
1866                  * will interfere.
1867                  */
1868                 write_unlock_bh(&bond->lock);
1869                 read_lock(&bond->lock);
1870                 write_lock_bh(&bond->curr_slave_lock);
1871
1872                 bond_select_active_slave(bond);
1873
1874                 write_unlock_bh(&bond->curr_slave_lock);
1875                 read_unlock(&bond->lock);
1876                 write_lock_bh(&bond->lock);
1877         }
1878
1879         if (bond->slave_cnt == 0) {
1880                 bond_set_carrier(bond);
1881
1882                 /* if the last slave was removed, zero the mac address
1883                  * of the master so it will be set by the application
1884                  * to the mac address of the first slave
1885                  */
1886                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1887
1888                 if (list_empty(&bond->vlan_list)) {
1889                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1890                 } else {
1891                         pr_warning(DRV_NAME
1892                                ": %s: Warning: clearing HW address of %s while it "
1893                                "still has VLANs.\n",
1894                                bond_dev->name, bond_dev->name);
1895                         pr_warning(DRV_NAME
1896                                ": %s: When re-adding slaves, make sure the bond's "
1897                                "HW address matches its VLANs'.\n",
1898                                bond_dev->name);
1899                 }
1900         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1901                    !bond_has_challenged_slaves(bond)) {
1902                 pr_info(DRV_NAME
1903                        ": %s: last VLAN challenged slave %s "
1904                        "left bond %s. VLAN blocking is removed\n",
1905                        bond_dev->name, slave_dev->name, bond_dev->name);
1906                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1907         }
1908
1909         write_unlock_bh(&bond->lock);
1910
1911         /* must do this from outside any spinlocks */
1912         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1913
1914         bond_del_vlans_from_slave(bond, slave_dev);
1915
1916         /* If the mode USES_PRIMARY, then we should only remove its
1917          * promisc and mc settings if it was the curr_active_slave, but that was
1918          * already taken care of above when we detached the slave
1919          */
1920         if (!USES_PRIMARY(bond->params.mode)) {
1921                 /* unset promiscuity level from slave */
1922                 if (bond_dev->flags & IFF_PROMISC)
1923                         dev_set_promiscuity(slave_dev, -1);
1924
1925                 /* unset allmulti level from slave */
1926                 if (bond_dev->flags & IFF_ALLMULTI)
1927                         dev_set_allmulti(slave_dev, -1);
1928
1929                 /* flush master's mc_list from slave */
1930                 netif_addr_lock_bh(bond_dev);
1931                 bond_mc_list_flush(bond_dev, slave_dev);
1932                 netif_addr_unlock_bh(bond_dev);
1933         }
1934
1935         netdev_set_master(slave_dev, NULL);
1936
1937         /* close slave before restoring its mac address */
1938         dev_close(slave_dev);
1939
1940         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1941                 /* restore original ("permanent") mac address */
1942                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1943                 addr.sa_family = slave_dev->type;
1944                 dev_set_mac_address(slave_dev, &addr);
1945         }
1946
1947         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
1948                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
1949                                    IFF_SLAVE_NEEDARP);
1950
1951         kfree(slave);
1952
1953         return 0;  /* deletion OK */
1954 }
1955
1956 /*
1957 * Destroy a bonding device.
1958 * Must be under rtnl_lock when this function is called.
1959 */
1960 static void bond_uninit(struct net_device *bond_dev)
1961 {
1962         struct bonding *bond = netdev_priv(bond_dev);
1963
1964         bond_deinit(bond_dev);
1965         bond_destroy_sysfs_entry(bond);
1966
1967         if (bond->wq)
1968                 destroy_workqueue(bond->wq);
1969
1970         netif_addr_lock_bh(bond_dev);
1971         bond_mc_list_destroy(bond);
1972         netif_addr_unlock_bh(bond_dev);
1973 }
1974
1975 /*
1976 * First release a slave and than destroy the bond if no more slaves are left.
1977 * Must be under rtnl_lock when this function is called.
1978 */
1979 int  bond_release_and_destroy(struct net_device *bond_dev,
1980                               struct net_device *slave_dev)
1981 {
1982         struct bonding *bond = netdev_priv(bond_dev);
1983         int ret;
1984
1985         ret = bond_release(bond_dev, slave_dev);
1986         if ((ret == 0) && (bond->slave_cnt == 0)) {
1987                 pr_info(DRV_NAME ": %s: destroying bond %s.\n",
1988                        bond_dev->name, bond_dev->name);
1989                 unregister_netdevice(bond_dev);
1990         }
1991         return ret;
1992 }
1993
1994 /*
1995  * This function releases all slaves.
1996  */
1997 static int bond_release_all(struct net_device *bond_dev)
1998 {
1999         struct bonding *bond = netdev_priv(bond_dev);
2000         struct slave *slave;
2001         struct net_device *slave_dev;
2002         struct sockaddr addr;
2003
2004         write_lock_bh(&bond->lock);
2005
2006         netif_carrier_off(bond_dev);
2007
2008         if (bond->slave_cnt == 0)
2009                 goto out;
2010
2011         bond->current_arp_slave = NULL;
2012         bond->primary_slave = NULL;
2013         bond_change_active_slave(bond, NULL);
2014
2015         while ((slave = bond->first_slave) != NULL) {
2016                 /* Inform AD package of unbinding of slave
2017                  * before slave is detached from the list.
2018                  */
2019                 if (bond->params.mode == BOND_MODE_8023AD)
2020                         bond_3ad_unbind_slave(slave);
2021
2022                 slave_dev = slave->dev;
2023                 bond_detach_slave(bond, slave);
2024
2025                 /* now that the slave is detached, unlock and perform
2026                  * all the undo steps that should not be called from
2027                  * within a lock.
2028                  */
2029                 write_unlock_bh(&bond->lock);
2030
2031                 if (bond_is_lb(bond)) {
2032                         /* must be called only after the slave
2033                          * has been detached from the list
2034                          */
2035                         bond_alb_deinit_slave(bond, slave);
2036                 }
2037
2038                 bond_compute_features(bond);
2039
2040                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2041                 bond_del_vlans_from_slave(bond, slave_dev);
2042
2043                 /* If the mode USES_PRIMARY, then we should only remove its
2044                  * promisc and mc settings if it was the curr_active_slave, but that was
2045                  * already taken care of above when we detached the slave
2046                  */
2047                 if (!USES_PRIMARY(bond->params.mode)) {
2048                         /* unset promiscuity level from slave */
2049                         if (bond_dev->flags & IFF_PROMISC)
2050                                 dev_set_promiscuity(slave_dev, -1);
2051
2052                         /* unset allmulti level from slave */
2053                         if (bond_dev->flags & IFF_ALLMULTI)
2054                                 dev_set_allmulti(slave_dev, -1);
2055
2056                         /* flush master's mc_list from slave */
2057                         netif_addr_lock_bh(bond_dev);
2058                         bond_mc_list_flush(bond_dev, slave_dev);
2059                         netif_addr_unlock_bh(bond_dev);
2060                 }
2061
2062                 netdev_set_master(slave_dev, NULL);
2063
2064                 /* close slave before restoring its mac address */
2065                 dev_close(slave_dev);
2066
2067                 if (!bond->params.fail_over_mac) {
2068                         /* restore original ("permanent") mac address*/
2069                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2070                         addr.sa_family = slave_dev->type;
2071                         dev_set_mac_address(slave_dev, &addr);
2072                 }
2073
2074                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2075                                            IFF_SLAVE_INACTIVE);
2076
2077                 kfree(slave);
2078
2079                 /* re-acquire the lock before getting the next slave */
2080                 write_lock_bh(&bond->lock);
2081         }
2082
2083         /* zero the mac address of the master so it will be
2084          * set by the application to the mac address of the
2085          * first slave
2086          */
2087         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2088
2089         if (list_empty(&bond->vlan_list))
2090                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2091         else {
2092                 pr_warning(DRV_NAME
2093                        ": %s: Warning: clearing HW address of %s while it "
2094                        "still has VLANs.\n",
2095                        bond_dev->name, bond_dev->name);
2096                 pr_warning(DRV_NAME
2097                        ": %s: When re-adding slaves, make sure the bond's "
2098                        "HW address matches its VLANs'.\n",
2099                        bond_dev->name);
2100         }
2101
2102         pr_info(DRV_NAME
2103                ": %s: released all slaves\n",
2104                bond_dev->name);
2105
2106 out:
2107         write_unlock_bh(&bond->lock);
2108
2109         return 0;
2110 }
2111
2112 /*
2113  * This function changes the active slave to slave <slave_dev>.
2114  * It returns -EINVAL in the following cases.
2115  *  - <slave_dev> is not found in the list.
2116  *  - There is not active slave now.
2117  *  - <slave_dev> is already active.
2118  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2119  *  - <slave_dev> is not running.
2120  * In these cases, this function does nothing.
2121  * In the other cases, current_slave pointer is changed and 0 is returned.
2122  */
2123 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2124 {
2125         struct bonding *bond = netdev_priv(bond_dev);
2126         struct slave *old_active = NULL;
2127         struct slave *new_active = NULL;
2128         int res = 0;
2129
2130         if (!USES_PRIMARY(bond->params.mode))
2131                 return -EINVAL;
2132
2133         /* Verify that master_dev is indeed the master of slave_dev */
2134         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2135                 return -EINVAL;
2136
2137         read_lock(&bond->lock);
2138
2139         read_lock(&bond->curr_slave_lock);
2140         old_active = bond->curr_active_slave;
2141         read_unlock(&bond->curr_slave_lock);
2142
2143         new_active = bond_get_slave_by_dev(bond, slave_dev);
2144
2145         /*
2146          * Changing to the current active: do nothing; return success.
2147          */
2148         if (new_active && (new_active == old_active)) {
2149                 read_unlock(&bond->lock);
2150                 return 0;
2151         }
2152
2153         if ((new_active) &&
2154             (old_active) &&
2155             (new_active->link == BOND_LINK_UP) &&
2156             IS_UP(new_active->dev)) {
2157                 write_lock_bh(&bond->curr_slave_lock);
2158                 bond_change_active_slave(bond, new_active);
2159                 write_unlock_bh(&bond->curr_slave_lock);
2160         } else
2161                 res = -EINVAL;
2162
2163         read_unlock(&bond->lock);
2164
2165         return res;
2166 }
2167
2168 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2169 {
2170         struct bonding *bond = netdev_priv(bond_dev);
2171
2172         info->bond_mode = bond->params.mode;
2173         info->miimon = bond->params.miimon;
2174
2175         read_lock(&bond->lock);
2176         info->num_slaves = bond->slave_cnt;
2177         read_unlock(&bond->lock);
2178
2179         return 0;
2180 }
2181
2182 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2183 {
2184         struct bonding *bond = netdev_priv(bond_dev);
2185         struct slave *slave;
2186         int i, res = -ENODEV;
2187
2188         read_lock(&bond->lock);
2189
2190         bond_for_each_slave(bond, slave, i) {
2191                 if (i == (int)info->slave_id) {
2192                         res = 0;
2193                         strcpy(info->slave_name, slave->dev->name);
2194                         info->link = slave->link;
2195                         info->state = slave->state;
2196                         info->link_failure_count = slave->link_failure_count;
2197                         break;
2198                 }
2199         }
2200
2201         read_unlock(&bond->lock);
2202
2203         return res;
2204 }
2205
2206 /*-------------------------------- Monitoring -------------------------------*/
2207
2208
2209 static int bond_miimon_inspect(struct bonding *bond)
2210 {
2211         struct slave *slave;
2212         int i, link_state, commit = 0;
2213         bool ignore_updelay;
2214
2215         ignore_updelay = !bond->curr_active_slave ? true : false;
2216
2217         bond_for_each_slave(bond, slave, i) {
2218                 slave->new_link = BOND_LINK_NOCHANGE;
2219
2220                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2221
2222                 switch (slave->link) {
2223                 case BOND_LINK_UP:
2224                         if (link_state)
2225                                 continue;
2226
2227                         slave->link = BOND_LINK_FAIL;
2228                         slave->delay = bond->params.downdelay;
2229                         if (slave->delay) {
2230                                 pr_info(DRV_NAME
2231                                        ": %s: link status down for %s"
2232                                        "interface %s, disabling it in %d ms.\n",
2233                                        bond->dev->name,
2234                                        (bond->params.mode ==
2235                                         BOND_MODE_ACTIVEBACKUP) ?
2236                                        ((slave->state == BOND_STATE_ACTIVE) ?
2237                                         "active " : "backup ") : "",
2238                                        slave->dev->name,
2239                                        bond->params.downdelay * bond->params.miimon);
2240                         }
2241                         /*FALLTHRU*/
2242                 case BOND_LINK_FAIL:
2243                         if (link_state) {
2244                                 /*
2245                                  * recovered before downdelay expired
2246                                  */
2247                                 slave->link = BOND_LINK_UP;
2248                                 slave->jiffies = jiffies;
2249                                 pr_info(DRV_NAME
2250                                        ": %s: link status up again after %d "
2251                                        "ms for interface %s.\n",
2252                                        bond->dev->name,
2253                                        (bond->params.downdelay - slave->delay) *
2254                                        bond->params.miimon,
2255                                        slave->dev->name);
2256                                 continue;
2257                         }
2258
2259                         if (slave->delay <= 0) {
2260                                 slave->new_link = BOND_LINK_DOWN;
2261                                 commit++;
2262                                 continue;
2263                         }
2264
2265                         slave->delay--;
2266                         break;
2267
2268                 case BOND_LINK_DOWN:
2269                         if (!link_state)
2270                                 continue;
2271
2272                         slave->link = BOND_LINK_BACK;
2273                         slave->delay = bond->params.updelay;
2274
2275                         if (slave->delay) {
2276                                 pr_info(DRV_NAME
2277                                        ": %s: link status up for "
2278                                        "interface %s, enabling it in %d ms.\n",
2279                                        bond->dev->name, slave->dev->name,
2280                                        ignore_updelay ? 0 :
2281                                        bond->params.updelay *
2282                                        bond->params.miimon);
2283                         }
2284                         /*FALLTHRU*/
2285                 case BOND_LINK_BACK:
2286                         if (!link_state) {
2287                                 slave->link = BOND_LINK_DOWN;
2288                                 pr_info(DRV_NAME
2289                                        ": %s: link status down again after %d "
2290                                        "ms for interface %s.\n",
2291                                        bond->dev->name,
2292                                        (bond->params.updelay - slave->delay) *
2293                                        bond->params.miimon,
2294                                        slave->dev->name);
2295
2296                                 continue;
2297                         }
2298
2299                         if (ignore_updelay)
2300                                 slave->delay = 0;
2301
2302                         if (slave->delay <= 0) {
2303                                 slave->new_link = BOND_LINK_UP;
2304                                 commit++;
2305                                 ignore_updelay = false;
2306                                 continue;
2307                         }
2308
2309                         slave->delay--;
2310                         break;
2311                 }
2312         }
2313
2314         return commit;
2315 }
2316
2317 static void bond_miimon_commit(struct bonding *bond)
2318 {
2319         struct slave *slave;
2320         int i;
2321
2322         bond_for_each_slave(bond, slave, i) {
2323                 switch (slave->new_link) {
2324                 case BOND_LINK_NOCHANGE:
2325                         continue;
2326
2327                 case BOND_LINK_UP:
2328                         slave->link = BOND_LINK_UP;
2329                         slave->jiffies = jiffies;
2330
2331                         if (bond->params.mode == BOND_MODE_8023AD) {
2332                                 /* prevent it from being the active one */
2333                                 slave->state = BOND_STATE_BACKUP;
2334                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2335                                 /* make it immediately active */
2336                                 slave->state = BOND_STATE_ACTIVE;
2337                         } else if (slave != bond->primary_slave) {
2338                                 /* prevent it from being the active one */
2339                                 slave->state = BOND_STATE_BACKUP;
2340                         }
2341
2342                         pr_info(DRV_NAME
2343                                ": %s: link status definitely "
2344                                "up for interface %s.\n",
2345                                bond->dev->name, slave->dev->name);
2346
2347                         /* notify ad that the link status has changed */
2348                         if (bond->params.mode == BOND_MODE_8023AD)
2349                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2350
2351                         if (bond_is_lb(bond))
2352                                 bond_alb_handle_link_change(bond, slave,
2353                                                             BOND_LINK_UP);
2354
2355                         if (!bond->curr_active_slave ||
2356                             (slave == bond->primary_slave))
2357                                 goto do_failover;
2358
2359                         continue;
2360
2361                 case BOND_LINK_DOWN:
2362                         if (slave->link_failure_count < UINT_MAX)
2363                                 slave->link_failure_count++;
2364
2365                         slave->link = BOND_LINK_DOWN;
2366
2367                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2368                             bond->params.mode == BOND_MODE_8023AD)
2369                                 bond_set_slave_inactive_flags(slave);
2370
2371                         pr_info(DRV_NAME
2372                                ": %s: link status definitely down for "
2373                                "interface %s, disabling it\n",
2374                                bond->dev->name, slave->dev->name);
2375
2376                         if (bond->params.mode == BOND_MODE_8023AD)
2377                                 bond_3ad_handle_link_change(slave,
2378                                                             BOND_LINK_DOWN);
2379
2380                         if (bond_is_lb(bond))
2381                                 bond_alb_handle_link_change(bond, slave,
2382                                                             BOND_LINK_DOWN);
2383
2384                         if (slave == bond->curr_active_slave)
2385                                 goto do_failover;
2386
2387                         continue;
2388
2389                 default:
2390                         pr_err(DRV_NAME
2391                                ": %s: invalid new link %d on slave %s\n",
2392                                bond->dev->name, slave->new_link,
2393                                slave->dev->name);
2394                         slave->new_link = BOND_LINK_NOCHANGE;
2395
2396                         continue;
2397                 }
2398
2399 do_failover:
2400                 ASSERT_RTNL();
2401                 write_lock_bh(&bond->curr_slave_lock);
2402                 bond_select_active_slave(bond);
2403                 write_unlock_bh(&bond->curr_slave_lock);
2404         }
2405
2406         bond_set_carrier(bond);
2407 }
2408
2409 /*
2410  * bond_mii_monitor
2411  *
2412  * Really a wrapper that splits the mii monitor into two phases: an
2413  * inspection, then (if inspection indicates something needs to be done)
2414  * an acquisition of appropriate locks followed by a commit phase to
2415  * implement whatever link state changes are indicated.
2416  */
2417 void bond_mii_monitor(struct work_struct *work)
2418 {
2419         struct bonding *bond = container_of(work, struct bonding,
2420                                             mii_work.work);
2421
2422         read_lock(&bond->lock);
2423         if (bond->kill_timers)
2424                 goto out;
2425
2426         if (bond->slave_cnt == 0)
2427                 goto re_arm;
2428
2429         if (bond->send_grat_arp) {
2430                 read_lock(&bond->curr_slave_lock);
2431                 bond_send_gratuitous_arp(bond);
2432                 read_unlock(&bond->curr_slave_lock);
2433         }
2434
2435         if (bond->send_unsol_na) {
2436                 read_lock(&bond->curr_slave_lock);
2437                 bond_send_unsolicited_na(bond);
2438                 read_unlock(&bond->curr_slave_lock);
2439         }
2440
2441         if (bond_miimon_inspect(bond)) {
2442                 read_unlock(&bond->lock);
2443                 rtnl_lock();
2444                 read_lock(&bond->lock);
2445
2446                 bond_miimon_commit(bond);
2447
2448                 read_unlock(&bond->lock);
2449                 rtnl_unlock();  /* might sleep, hold no other locks */
2450                 read_lock(&bond->lock);
2451         }
2452
2453 re_arm:
2454         if (bond->params.miimon)
2455                 queue_delayed_work(bond->wq, &bond->mii_work,
2456                                    msecs_to_jiffies(bond->params.miimon));
2457 out:
2458         read_unlock(&bond->lock);
2459 }
2460
2461 static __be32 bond_glean_dev_ip(struct net_device *dev)
2462 {
2463         struct in_device *idev;
2464         struct in_ifaddr *ifa;
2465         __be32 addr = 0;
2466
2467         if (!dev)
2468                 return 0;
2469
2470         rcu_read_lock();
2471         idev = __in_dev_get_rcu(dev);
2472         if (!idev)
2473                 goto out;
2474
2475         ifa = idev->ifa_list;
2476         if (!ifa)
2477                 goto out;
2478
2479         addr = ifa->ifa_local;
2480 out:
2481         rcu_read_unlock();
2482         return addr;
2483 }
2484
2485 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2486 {
2487         struct vlan_entry *vlan;
2488
2489         if (ip == bond->master_ip)
2490                 return 1;
2491
2492         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2493                 if (ip == vlan->vlan_ip)
2494                         return 1;
2495         }
2496
2497         return 0;
2498 }
2499
2500 /*
2501  * We go to the (large) trouble of VLAN tagging ARP frames because
2502  * switches in VLAN mode (especially if ports are configured as
2503  * "native" to a VLAN) might not pass non-tagged frames.
2504  */
2505 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2506 {
2507         struct sk_buff *skb;
2508
2509         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2510                slave_dev->name, dest_ip, src_ip, vlan_id);
2511
2512         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2513                          NULL, slave_dev->dev_addr, NULL);
2514
2515         if (!skb) {
2516                 pr_err(DRV_NAME ": ARP packet allocation failed\n");
2517                 return;
2518         }
2519         if (vlan_id) {
2520                 skb = vlan_put_tag(skb, vlan_id);
2521                 if (!skb) {
2522                         pr_err(DRV_NAME ": failed to insert VLAN tag\n");
2523                         return;
2524                 }
2525         }
2526         arp_xmit(skb);
2527 }
2528
2529
2530 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2531 {
2532         int i, vlan_id, rv;
2533         __be32 *targets = bond->params.arp_targets;
2534         struct vlan_entry *vlan;
2535         struct net_device *vlan_dev;
2536         struct flowi fl;
2537         struct rtable *rt;
2538
2539         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2540                 if (!targets[i])
2541                         break;
2542                 pr_debug("basa: target %x\n", targets[i]);
2543                 if (list_empty(&bond->vlan_list)) {
2544                         pr_debug("basa: empty vlan: arp_send\n");
2545                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2546                                       bond->master_ip, 0);
2547                         continue;
2548                 }
2549
2550                 /*
2551                  * If VLANs are configured, we do a route lookup to
2552                  * determine which VLAN interface would be used, so we
2553                  * can tag the ARP with the proper VLAN tag.
2554                  */
2555                 memset(&fl, 0, sizeof(fl));
2556                 fl.fl4_dst = targets[i];
2557                 fl.fl4_tos = RTO_ONLINK;
2558
2559                 rv = ip_route_output_key(&init_net, &rt, &fl);
2560                 if (rv) {
2561                         if (net_ratelimit()) {
2562                                 pr_warning(DRV_NAME
2563                              ": %s: no route to arp_ip_target %pI4\n",
2564                                        bond->dev->name, &fl.fl4_dst);
2565                         }
2566                         continue;
2567                 }
2568
2569                 /*
2570                  * This target is not on a VLAN
2571                  */
2572                 if (rt->u.dst.dev == bond->dev) {
2573                         ip_rt_put(rt);
2574                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2575                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2576                                       bond->master_ip, 0);
2577                         continue;
2578                 }
2579
2580                 vlan_id = 0;
2581                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2582                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2583                         if (vlan_dev == rt->u.dst.dev) {
2584                                 vlan_id = vlan->vlan_id;
2585                                 pr_debug("basa: vlan match on %s %d\n",
2586                                        vlan_dev->name, vlan_id);
2587                                 break;
2588                         }
2589                 }
2590
2591                 if (vlan_id) {
2592                         ip_rt_put(rt);
2593                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2594                                       vlan->vlan_ip, vlan_id);
2595                         continue;
2596                 }
2597
2598                 if (net_ratelimit()) {
2599                         pr_warning(DRV_NAME
2600                ": %s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2601                                bond->dev->name, &fl.fl4_dst,
2602                                rt->u.dst.dev ? rt->u.dst.dev->name : "NULL");
2603                 }
2604                 ip_rt_put(rt);
2605         }
2606 }
2607
2608 /*
2609  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2610  * for each VLAN above us.
2611  *
2612  * Caller must hold curr_slave_lock for read or better
2613  */
2614 static void bond_send_gratuitous_arp(struct bonding *bond)
2615 {
2616         struct slave *slave = bond->curr_active_slave;
2617         struct vlan_entry *vlan;
2618         struct net_device *vlan_dev;
2619
2620         pr_debug("bond_send_grat_arp: bond %s slave %s\n", bond->dev->name,
2621                                 slave ? slave->dev->name : "NULL");
2622
2623         if (!slave || !bond->send_grat_arp ||
2624             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2625                 return;
2626
2627         bond->send_grat_arp--;
2628
2629         if (bond->master_ip) {
2630                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2631                                 bond->master_ip, 0);
2632         }
2633
2634         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2635                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2636                 if (vlan->vlan_ip) {
2637                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2638                                       vlan->vlan_ip, vlan->vlan_id);
2639                 }
2640         }
2641 }
2642
2643 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2644 {
2645         int i;
2646         __be32 *targets = bond->params.arp_targets;
2647
2648         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2649                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2650                         &sip, &tip, i, &targets[i], bond_has_this_ip(bond, tip));
2651                 if (sip == targets[i]) {
2652                         if (bond_has_this_ip(bond, tip))
2653                                 slave->last_arp_rx = jiffies;
2654                         return;
2655                 }
2656         }
2657 }
2658
2659 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2660 {
2661         struct arphdr *arp;
2662         struct slave *slave;
2663         struct bonding *bond;
2664         unsigned char *arp_ptr;
2665         __be32 sip, tip;
2666
2667         if (dev_net(dev) != &init_net)
2668                 goto out;
2669
2670         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2671                 goto out;
2672
2673         bond = netdev_priv(dev);
2674         read_lock(&bond->lock);
2675
2676         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2677                 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2678                 orig_dev ? orig_dev->name : "NULL");
2679
2680         slave = bond_get_slave_by_dev(bond, orig_dev);
2681         if (!slave || !slave_do_arp_validate(bond, slave))
2682                 goto out_unlock;
2683
2684         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2685                 goto out_unlock;
2686
2687         arp = arp_hdr(skb);
2688         if (arp->ar_hln != dev->addr_len ||
2689             skb->pkt_type == PACKET_OTHERHOST ||
2690             skb->pkt_type == PACKET_LOOPBACK ||
2691             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2692             arp->ar_pro != htons(ETH_P_IP) ||
2693             arp->ar_pln != 4)
2694                 goto out_unlock;
2695
2696         arp_ptr = (unsigned char *)(arp + 1);
2697         arp_ptr += dev->addr_len;
2698         memcpy(&sip, arp_ptr, 4);
2699         arp_ptr += 4 + dev->addr_len;
2700         memcpy(&tip, arp_ptr, 4);
2701
2702         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2703                 bond->dev->name, slave->dev->name, slave->state,
2704                 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2705                 &sip, &tip);
2706
2707         /*
2708          * Backup slaves won't see the ARP reply, but do come through
2709          * here for each ARP probe (so we swap the sip/tip to validate
2710          * the probe).  In a "redundant switch, common router" type of
2711          * configuration, the ARP probe will (hopefully) travel from
2712          * the active, through one switch, the router, then the other
2713          * switch before reaching the backup.
2714          */
2715         if (slave->state == BOND_STATE_ACTIVE)
2716                 bond_validate_arp(bond, slave, sip, tip);
2717         else
2718                 bond_validate_arp(bond, slave, tip, sip);
2719
2720 out_unlock:
2721         read_unlock(&bond->lock);
2722 out:
2723         dev_kfree_skb(skb);
2724         return NET_RX_SUCCESS;
2725 }
2726
2727 /*
2728  * this function is called regularly to monitor each slave's link
2729  * ensuring that traffic is being sent and received when arp monitoring
2730  * is used in load-balancing mode. if the adapter has been dormant, then an
2731  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2732  * arp monitoring in active backup mode.
2733  */
2734 void bond_loadbalance_arp_mon(struct work_struct *work)
2735 {
2736         struct bonding *bond = container_of(work, struct bonding,
2737                                             arp_work.work);
2738         struct slave *slave, *oldcurrent;
2739         int do_failover = 0;
2740         int delta_in_ticks;
2741         int i;
2742
2743         read_lock(&bond->lock);
2744
2745         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2746
2747         if (bond->kill_timers)
2748                 goto out;
2749
2750         if (bond->slave_cnt == 0)
2751                 goto re_arm;
2752
2753         read_lock(&bond->curr_slave_lock);
2754         oldcurrent = bond->curr_active_slave;
2755         read_unlock(&bond->curr_slave_lock);
2756
2757         /* see if any of the previous devices are up now (i.e. they have
2758          * xmt and rcv traffic). the curr_active_slave does not come into
2759          * the picture unless it is null. also, slave->jiffies is not needed
2760          * here because we send an arp on each slave and give a slave as
2761          * long as it needs to get the tx/rx within the delta.
2762          * TODO: what about up/down delay in arp mode? it wasn't here before
2763          *       so it can wait
2764          */
2765         bond_for_each_slave(bond, slave, i) {
2766                 if (slave->link != BOND_LINK_UP) {
2767                         if (time_before_eq(jiffies, dev_trans_start(slave->dev) + delta_in_ticks) &&
2768                             time_before_eq(jiffies, slave->dev->last_rx + delta_in_ticks)) {
2769
2770                                 slave->link  = BOND_LINK_UP;
2771                                 slave->state = BOND_STATE_ACTIVE;
2772
2773                                 /* primary_slave has no meaning in round-robin
2774                                  * mode. the window of a slave being up and
2775                                  * curr_active_slave being null after enslaving
2776                                  * is closed.
2777                                  */
2778                                 if (!oldcurrent) {
2779                                         pr_info(DRV_NAME
2780                                                ": %s: link status definitely "
2781                                                "up for interface %s, ",
2782                                                bond->dev->name,
2783                                                slave->dev->name);
2784                                         do_failover = 1;
2785                                 } else {
2786                                         pr_info(DRV_NAME
2787                                                ": %s: interface %s is now up\n",
2788                                                bond->dev->name,
2789                                                slave->dev->name);
2790                                 }
2791                         }
2792                 } else {
2793                         /* slave->link == BOND_LINK_UP */
2794
2795                         /* not all switches will respond to an arp request
2796                          * when the source ip is 0, so don't take the link down
2797                          * if we don't know our ip yet
2798                          */
2799                         if (time_after_eq(jiffies, dev_trans_start(slave->dev) + 2*delta_in_ticks) ||
2800                             (time_after_eq(jiffies, slave->dev->last_rx + 2*delta_in_ticks))) {
2801
2802                                 slave->link  = BOND_LINK_DOWN;
2803                                 slave->state = BOND_STATE_BACKUP;
2804
2805                                 if (slave->link_failure_count < UINT_MAX)
2806                                         slave->link_failure_count++;
2807
2808                                 pr_info(DRV_NAME
2809                                        ": %s: interface %s is now down.\n",
2810                                        bond->dev->name,
2811                                        slave->dev->name);
2812
2813                                 if (slave == oldcurrent)
2814                                         do_failover = 1;
2815                         }
2816                 }
2817
2818                 /* note: if switch is in round-robin mode, all links
2819                  * must tx arp to ensure all links rx an arp - otherwise
2820                  * links may oscillate or not come up at all; if switch is
2821                  * in something like xor mode, there is nothing we can
2822                  * do - all replies will be rx'ed on same link causing slaves
2823                  * to be unstable during low/no traffic periods
2824                  */
2825                 if (IS_UP(slave->dev))
2826                         bond_arp_send_all(bond, slave);
2827         }
2828
2829         if (do_failover) {
2830                 write_lock_bh(&bond->curr_slave_lock);
2831
2832                 bond_select_active_slave(bond);
2833
2834                 write_unlock_bh(&bond->curr_slave_lock);
2835         }
2836
2837 re_arm:
2838         if (bond->params.arp_interval)
2839                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2840 out:
2841         read_unlock(&bond->lock);
2842 }
2843
2844 /*
2845  * Called to inspect slaves for active-backup mode ARP monitor link state
2846  * changes.  Sets new_link in slaves to specify what action should take
2847  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2848  * to link states must be committed.
2849  *
2850  * Called with bond->lock held for read.
2851  */
2852 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2853 {
2854         struct slave *slave;
2855         int i, commit = 0;
2856
2857         bond_for_each_slave(bond, slave, i) {
2858                 slave->new_link = BOND_LINK_NOCHANGE;
2859
2860                 if (slave->link != BOND_LINK_UP) {
2861                         if (time_before_eq(jiffies, slave_last_rx(bond, slave) +
2862                                            delta_in_ticks)) {
2863                                 slave->new_link = BOND_LINK_UP;
2864                                 commit++;
2865                         }
2866
2867                         continue;
2868                 }
2869
2870                 /*
2871                  * Give slaves 2*delta after being enslaved or made
2872                  * active.  This avoids bouncing, as the last receive
2873                  * times need a full ARP monitor cycle to be updated.
2874                  */
2875                 if (!time_after_eq(jiffies, slave->jiffies +
2876                                    2 * delta_in_ticks))
2877                         continue;
2878
2879                 /*
2880                  * Backup slave is down if:
2881                  * - No current_arp_slave AND
2882                  * - more than 3*delta since last receive AND
2883                  * - the bond has an IP address
2884                  *
2885                  * Note: a non-null current_arp_slave indicates
2886                  * the curr_active_slave went down and we are
2887                  * searching for a new one; under this condition
2888                  * we only take the curr_active_slave down - this
2889                  * gives each slave a chance to tx/rx traffic
2890                  * before being taken out
2891                  */
2892                 if (slave->state == BOND_STATE_BACKUP &&
2893                     !bond->current_arp_slave &&
2894                     time_after(jiffies, slave_last_rx(bond, slave) +
2895                                3 * delta_in_ticks)) {
2896                         slave->new_link = BOND_LINK_DOWN;
2897                         commit++;
2898                 }
2899
2900                 /*
2901                  * Active slave is down if:
2902                  * - more than 2*delta since transmitting OR
2903                  * - (more than 2*delta since receive AND
2904                  *    the bond has an IP address)
2905                  */
2906                 if ((slave->state == BOND_STATE_ACTIVE) &&
2907                     (time_after_eq(jiffies, dev_trans_start(slave->dev) +
2908                                     2 * delta_in_ticks) ||
2909                       (time_after_eq(jiffies, slave_last_rx(bond, slave)
2910                                      + 2 * delta_in_ticks)))) {
2911                         slave->new_link = BOND_LINK_DOWN;
2912                         commit++;
2913                 }
2914         }
2915
2916         read_lock(&bond->curr_slave_lock);
2917
2918         /*
2919          * Trigger a commit if the primary option setting has changed.
2920          */
2921         if (bond->primary_slave &&
2922             (bond->primary_slave != bond->curr_active_slave) &&
2923             (bond->primary_slave->link == BOND_LINK_UP))
2924                 commit++;
2925
2926         read_unlock(&bond->curr_slave_lock);
2927
2928         return commit;
2929 }
2930
2931 /*
2932  * Called to commit link state changes noted by inspection step of
2933  * active-backup mode ARP monitor.
2934  *
2935  * Called with RTNL and bond->lock for read.
2936  */
2937 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2938 {
2939         struct slave *slave;
2940         int i;
2941
2942         bond_for_each_slave(bond, slave, i) {
2943                 switch (slave->new_link) {
2944                 case BOND_LINK_NOCHANGE:
2945                         continue;
2946
2947                 case BOND_LINK_UP:
2948                         write_lock_bh(&bond->curr_slave_lock);
2949
2950                         if (!bond->curr_active_slave &&
2951                             time_before_eq(jiffies, dev_trans_start(slave->dev) +
2952                                            delta_in_ticks)) {
2953                                 slave->link = BOND_LINK_UP;
2954                                 bond_change_active_slave(bond, slave);
2955                                 bond->current_arp_slave = NULL;
2956
2957                                 pr_info(DRV_NAME
2958                                        ": %s: %s is up and now the "
2959                                        "active interface\n",
2960                                        bond->dev->name, slave->dev->name);
2961
2962                         } else if (bond->curr_active_slave != slave) {
2963                                 /* this slave has just come up but we
2964                                  * already have a current slave; this can
2965                                  * also happen if bond_enslave adds a new
2966                                  * slave that is up while we are searching
2967                                  * for a new slave
2968                                  */
2969                                 slave->link = BOND_LINK_UP;
2970                                 bond_set_slave_inactive_flags(slave);
2971                                 bond->current_arp_slave = NULL;
2972
2973                                 pr_info(DRV_NAME
2974                                        ": %s: backup interface %s is now up\n",
2975                                        bond->dev->name, slave->dev->name);
2976                         }
2977
2978                         write_unlock_bh(&bond->curr_slave_lock);
2979
2980                         break;
2981
2982                 case BOND_LINK_DOWN:
2983                         if (slave->link_failure_count < UINT_MAX)
2984                                 slave->link_failure_count++;
2985
2986                         slave->link = BOND_LINK_DOWN;
2987
2988                         if (slave == bond->curr_active_slave) {
2989                                 pr_info(DRV_NAME
2990                                        ": %s: link status down for active "
2991                                        "interface %s, disabling it\n",
2992                                        bond->dev->name, slave->dev->name);
2993
2994                                 bond_set_slave_inactive_flags(slave);
2995
2996                                 write_lock_bh(&bond->curr_slave_lock);
2997
2998                                 bond_select_active_slave(bond);
2999                                 if (bond->curr_active_slave)
3000                                         bond->curr_active_slave->jiffies =
3001                                                 jiffies;
3002
3003                                 write_unlock_bh(&bond->curr_slave_lock);
3004
3005                                 bond->current_arp_slave = NULL;
3006
3007                         } else if (slave->state == BOND_STATE_BACKUP) {
3008                                 pr_info(DRV_NAME
3009                                        ": %s: backup interface %s is now down\n",
3010                                        bond->dev->name, slave->dev->name);
3011
3012                                 bond_set_slave_inactive_flags(slave);
3013                         }
3014                         break;
3015
3016                 default:
3017                         pr_err(DRV_NAME
3018                                ": %s: impossible: new_link %d on slave %s\n",
3019                                bond->dev->name, slave->new_link,
3020                                slave->dev->name);
3021                 }
3022         }
3023
3024         /*
3025          * No race with changes to primary via sysfs, as we hold rtnl.
3026          */
3027         if (bond->primary_slave &&
3028             (bond->primary_slave != bond->curr_active_slave) &&
3029             (bond->primary_slave->link == BOND_LINK_UP)) {
3030                 write_lock_bh(&bond->curr_slave_lock);
3031                 bond_change_active_slave(bond, bond->primary_slave);
3032                 write_unlock_bh(&bond->curr_slave_lock);
3033         }
3034
3035         bond_set_carrier(bond);
3036 }
3037
3038 /*
3039  * Send ARP probes for active-backup mode ARP monitor.
3040  *
3041  * Called with bond->lock held for read.
3042  */
3043 static void bond_ab_arp_probe(struct bonding *bond)
3044 {
3045         struct slave *slave;
3046         int i;
3047
3048         read_lock(&bond->curr_slave_lock);
3049
3050         if (bond->current_arp_slave && bond->curr_active_slave)
3051                 pr_info(DRV_NAME "PROBE: c_arp %s && cas %s BAD\n",
3052                        bond->current_arp_slave->dev->name,
3053                        bond->curr_active_slave->dev->name);
3054
3055         if (bond->curr_active_slave) {
3056                 bond_arp_send_all(bond, bond->curr_active_slave);
3057                 read_unlock(&bond->curr_slave_lock);
3058                 return;
3059         }
3060
3061         read_unlock(&bond->curr_slave_lock);
3062
3063         /* if we don't have a curr_active_slave, search for the next available
3064          * backup slave from the current_arp_slave and make it the candidate
3065          * for becoming the curr_active_slave
3066          */
3067
3068         if (!bond->current_arp_slave) {
3069                 bond->current_arp_slave = bond->first_slave;
3070                 if (!bond->current_arp_slave)
3071                         return;
3072         }
3073
3074         bond_set_slave_inactive_flags(bond->current_arp_slave);
3075
3076         /* search for next candidate */
3077         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3078                 if (IS_UP(slave->dev)) {
3079                         slave->link = BOND_LINK_BACK;
3080                         bond_set_slave_active_flags(slave);
3081                         bond_arp_send_all(bond, slave);
3082                         slave->jiffies = jiffies;
3083                         bond->current_arp_slave = slave;
3084                         break;
3085                 }
3086
3087                 /* if the link state is up at this point, we
3088                  * mark it down - this can happen if we have
3089                  * simultaneous link failures and
3090                  * reselect_active_interface doesn't make this
3091                  * one the current slave so it is still marked
3092                  * up when it is actually down
3093                  */
3094                 if (slave->link == BOND_LINK_UP) {
3095                         slave->link = BOND_LINK_DOWN;
3096                         if (slave->link_failure_count < UINT_MAX)
3097                                 slave->link_failure_count++;
3098
3099                         bond_set_slave_inactive_flags(slave);
3100
3101                         pr_info(DRV_NAME
3102                                ": %s: backup interface %s is now down.\n",
3103                                bond->dev->name, slave->dev->name);
3104                 }
3105         }
3106 }
3107
3108 void bond_activebackup_arp_mon(struct work_struct *work)
3109 {
3110         struct bonding *bond = container_of(work, struct bonding,
3111                                             arp_work.work);
3112         int delta_in_ticks;
3113
3114         read_lock(&bond->lock);
3115
3116         if (bond->kill_timers)
3117                 goto out;
3118
3119         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3120
3121         if (bond->slave_cnt == 0)
3122                 goto re_arm;
3123
3124         if (bond->send_grat_arp) {
3125                 read_lock(&bond->curr_slave_lock);
3126                 bond_send_gratuitous_arp(bond);
3127                 read_unlock(&bond->curr_slave_lock);
3128         }
3129
3130         if (bond->send_unsol_na) {
3131                 read_lock(&bond->curr_slave_lock);
3132                 bond_send_unsolicited_na(bond);
3133                 read_unlock(&bond->curr_slave_lock);
3134         }
3135
3136         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3137                 read_unlock(&bond->lock);
3138                 rtnl_lock();
3139                 read_lock(&bond->lock);
3140
3141                 bond_ab_arp_commit(bond, delta_in_ticks);
3142
3143                 read_unlock(&bond->lock);
3144                 rtnl_unlock();
3145                 read_lock(&bond->lock);
3146         }
3147
3148         bond_ab_arp_probe(bond);
3149
3150 re_arm:
3151         if (bond->params.arp_interval)
3152                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3153 out:
3154         read_unlock(&bond->lock);
3155 }
3156
3157 /*------------------------------ proc/seq_file-------------------------------*/
3158
3159 #ifdef CONFIG_PROC_FS
3160
3161 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3162         __acquires(&dev_base_lock)
3163         __acquires(&bond->lock)
3164 {
3165         struct bonding *bond = seq->private;
3166         loff_t off = 0;
3167         struct slave *slave;
3168         int i;
3169
3170         /* make sure the bond won't be taken away */
3171         read_lock(&dev_base_lock);
3172         read_lock(&bond->lock);
3173
3174         if (*pos == 0)
3175                 return SEQ_START_TOKEN;
3176
3177         bond_for_each_slave(bond, slave, i) {
3178                 if (++off == *pos)
3179                         return slave;
3180         }
3181
3182         return NULL;
3183 }
3184
3185 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3186 {
3187         struct bonding *bond = seq->private;
3188         struct slave *slave = v;
3189
3190         ++*pos;
3191         if (v == SEQ_START_TOKEN)
3192                 return bond->first_slave;
3193
3194         slave = slave->next;
3195
3196         return (slave == bond->first_slave) ? NULL : slave;
3197 }
3198
3199 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3200         __releases(&bond->lock)
3201         __releases(&dev_base_lock)
3202 {
3203         struct bonding *bond = seq->private;
3204
3205         read_unlock(&bond->lock);
3206         read_unlock(&dev_base_lock);
3207 }
3208
3209 static void bond_info_show_master(struct seq_file *seq)
3210 {
3211         struct bonding *bond = seq->private;
3212         struct slave *curr;
3213         int i;
3214
3215         read_lock(&bond->curr_slave_lock);
3216         curr = bond->curr_active_slave;
3217         read_unlock(&bond->curr_slave_lock);
3218
3219         seq_printf(seq, "Bonding Mode: %s",
3220                    bond_mode_name(bond->params.mode));
3221
3222         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3223             bond->params.fail_over_mac)
3224                 seq_printf(seq, " (fail_over_mac %s)",
3225                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3226
3227         seq_printf(seq, "\n");
3228
3229         if (bond->params.mode == BOND_MODE_XOR ||
3230                 bond->params.mode == BOND_MODE_8023AD) {
3231                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3232                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3233                         bond->params.xmit_policy);
3234         }
3235
3236         if (USES_PRIMARY(bond->params.mode)) {
3237                 seq_printf(seq, "Primary Slave: %s\n",
3238                            (bond->primary_slave) ?
3239                            bond->primary_slave->dev->name : "None");
3240
3241                 seq_printf(seq, "Currently Active Slave: %s\n",
3242                            (curr) ? curr->dev->name : "None");
3243         }
3244
3245         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3246                    "up" : "down");
3247         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3248         seq_printf(seq, "Up Delay (ms): %d\n",
3249                    bond->params.updelay * bond->params.miimon);
3250         seq_printf(seq, "Down Delay (ms): %d\n",
3251                    bond->params.downdelay * bond->params.miimon);
3252
3253
3254         /* ARP information */
3255         if (bond->params.arp_interval > 0) {
3256                 int printed = 0;
3257                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3258                                 bond->params.arp_interval);
3259
3260                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3261
3262                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3263                         if (!bond->params.arp_targets[i])
3264                                 break;
3265                         if (printed)
3266                                 seq_printf(seq, ",");
3267                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3268                         printed = 1;
3269                 }
3270                 seq_printf(seq, "\n");
3271         }
3272
3273         if (bond->params.mode == BOND_MODE_8023AD) {
3274                 struct ad_info ad_info;
3275
3276                 seq_puts(seq, "\n802.3ad info\n");
3277                 seq_printf(seq, "LACP rate: %s\n",
3278                            (bond->params.lacp_fast) ? "fast" : "slow");
3279                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3280                            ad_select_tbl[bond->params.ad_select].modename);
3281
3282                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3283                         seq_printf(seq, "bond %s has no active aggregator\n",
3284                                    bond->dev->name);
3285                 } else {
3286                         seq_printf(seq, "Active Aggregator Info:\n");
3287
3288                         seq_printf(seq, "\tAggregator ID: %d\n",
3289                                    ad_info.aggregator_id);
3290                         seq_printf(seq, "\tNumber of ports: %d\n",
3291                                    ad_info.ports);
3292                         seq_printf(seq, "\tActor Key: %d\n",
3293                                    ad_info.actor_key);
3294                         seq_printf(seq, "\tPartner Key: %d\n",
3295                                    ad_info.partner_key);
3296                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3297                                    ad_info.partner_system);
3298                 }
3299         }
3300 }
3301
3302 static void bond_info_show_slave(struct seq_file *seq,
3303                                  const struct slave *slave)
3304 {
3305         struct bonding *bond = seq->private;
3306
3307         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3308         seq_printf(seq, "MII Status: %s\n",
3309                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3310         seq_printf(seq, "Link Failure Count: %u\n",
3311                    slave->link_failure_count);
3312
3313         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3314
3315         if (bond->params.mode == BOND_MODE_8023AD) {
3316                 const struct aggregator *agg
3317                         = SLAVE_AD_INFO(slave).port.aggregator;
3318
3319                 if (agg)
3320                         seq_printf(seq, "Aggregator ID: %d\n",
3321                                    agg->aggregator_identifier);
3322                 else
3323                         seq_puts(seq, "Aggregator ID: N/A\n");
3324         }
3325 }
3326
3327 static int bond_info_seq_show(struct seq_file *seq, void *v)
3328 {
3329         if (v == SEQ_START_TOKEN) {
3330                 seq_printf(seq, "%s\n", version);
3331                 bond_info_show_master(seq);
3332         } else
3333                 bond_info_show_slave(seq, v);
3334
3335         return 0;
3336 }
3337
3338 static const struct seq_operations bond_info_seq_ops = {
3339         .start = bond_info_seq_start,
3340         .next  = bond_info_seq_next,
3341         .stop  = bond_info_seq_stop,
3342         .show  = bond_info_seq_show,
3343 };
3344
3345 static int bond_info_open(struct inode *inode, struct file *file)
3346 {
3347         struct seq_file *seq;
3348         struct proc_dir_entry *proc;
3349         int res;
3350
3351         res = seq_open(file, &bond_info_seq_ops);
3352         if (!res) {
3353                 /* recover the pointer buried in proc_dir_entry data */
3354                 seq = file->private_data;
3355                 proc = PDE(inode);
3356                 seq->private = proc->data;
3357         }
3358
3359         return res;
3360 }
3361
3362 static const struct file_operations bond_info_fops = {
3363         .owner   = THIS_MODULE,
3364         .open    = bond_info_open,
3365         .read    = seq_read,
3366         .llseek  = seq_lseek,
3367         .release = seq_release,
3368 };
3369
3370 static int bond_create_proc_entry(struct bonding *bond)
3371 {
3372         struct net_device *bond_dev = bond->dev;
3373
3374         if (bond_proc_dir) {
3375                 bond->proc_entry = proc_create_data(bond_dev->name,
3376                                                     S_IRUGO, bond_proc_dir,
3377                                                     &bond_info_fops, bond);
3378                 if (bond->proc_entry == NULL)
3379                         pr_warning(DRV_NAME
3380                                ": Warning: Cannot create /proc/net/%s/%s\n",
3381                                DRV_NAME, bond_dev->name);
3382                 else
3383                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3384         }
3385
3386         return 0;
3387 }
3388
3389 static void bond_remove_proc_entry(struct bonding *bond)
3390 {
3391         if (bond_proc_dir && bond->proc_entry) {
3392                 remove_proc_entry(bond->proc_file_name, bond_proc_dir);
3393                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3394                 bond->proc_entry = NULL;
3395         }
3396 }
3397
3398 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3399  * Caller must hold rtnl_lock.
3400  */
3401 static void bond_create_proc_dir(void)
3402 {
3403         if (!bond_proc_dir) {
3404                 bond_proc_dir = proc_mkdir(DRV_NAME, init_net.proc_net);
3405                 if (!bond_proc_dir)
3406                         pr_warning(DRV_NAME
3407                                 ": Warning: cannot create /proc/net/%s\n",
3408                                 DRV_NAME);
3409         }
3410 }
3411
3412 /* Destroy the bonding directory under /proc/net, if empty.
3413  * Caller must hold rtnl_lock.
3414  */
3415 static void bond_destroy_proc_dir(void)
3416 {
3417         if (bond_proc_dir) {
3418                 remove_proc_entry(DRV_NAME, init_net.proc_net);
3419                 bond_proc_dir = NULL;
3420         }
3421 }
3422
3423 #else /* !CONFIG_PROC_FS */
3424
3425 static int bond_create_proc_entry(struct bonding *bond)
3426 {
3427 }
3428
3429 static void bond_remove_proc_entry(struct bonding *bond)
3430 {
3431 }
3432
3433 static void bond_create_proc_dir(void)
3434 {
3435 }
3436
3437 static void bond_destroy_proc_dir(void)
3438 {
3439 }
3440
3441 #endif /* CONFIG_PROC_FS */
3442
3443
3444 /*-------------------------- netdev event handling --------------------------*/
3445
3446 /*
3447  * Change device name
3448  */
3449 static int bond_event_changename(struct bonding *bond)
3450 {
3451         bond_remove_proc_entry(bond);
3452         bond_create_proc_entry(bond);
3453
3454         bond_destroy_sysfs_entry(bond);
3455         bond_create_sysfs_entry(bond);
3456
3457         return NOTIFY_DONE;
3458 }
3459
3460 static int bond_master_netdev_event(unsigned long event,
3461                                     struct net_device *bond_dev)
3462 {
3463         struct bonding *event_bond = netdev_priv(bond_dev);
3464
3465         switch (event) {
3466         case NETDEV_CHANGENAME:
3467                 return bond_event_changename(event_bond);
3468         case NETDEV_UNREGISTER:
3469                 bond_release_all(event_bond->dev);
3470                 break;
3471         default:
3472                 break;
3473         }
3474
3475         return NOTIFY_DONE;
3476 }
3477
3478 static int bond_slave_netdev_event(unsigned long event,
3479                                    struct net_device *slave_dev)
3480 {
3481         struct net_device *bond_dev = slave_dev->master;
3482         struct bonding *bond = netdev_priv(bond_dev);
3483
3484         switch (event) {
3485         case NETDEV_UNREGISTER:
3486                 if (bond_dev) {
3487                         if (bond->setup_by_slave)
3488                                 bond_release_and_destroy(bond_dev, slave_dev);
3489                         else
3490                                 bond_release(bond_dev, slave_dev);
3491                 }
3492                 break;
3493         case NETDEV_CHANGE:
3494                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3495                         struct slave *slave;
3496
3497                         slave = bond_get_slave_by_dev(bond, slave_dev);
3498                         if (slave) {
3499                                 u16 old_speed = slave->speed;
3500                                 u16 old_duplex = slave->duplex;
3501
3502                                 bond_update_speed_duplex(slave);
3503
3504                                 if (bond_is_lb(bond))
3505                                         break;
3506
3507                                 if (old_speed != slave->speed)
3508                                         bond_3ad_adapter_speed_changed(slave);
3509                                 if (old_duplex != slave->duplex)
3510                                         bond_3ad_adapter_duplex_changed(slave);
3511                         }
3512                 }
3513
3514                 break;
3515         case NETDEV_DOWN:
3516                 /*
3517                  * ... Or is it this?
3518                  */
3519                 break;
3520         case NETDEV_CHANGEMTU:
3521                 /*
3522                  * TODO: Should slaves be allowed to
3523                  * independently alter their MTU?  For
3524                  * an active-backup bond, slaves need
3525                  * not be the same type of device, so
3526                  * MTUs may vary.  For other modes,
3527                  * slaves arguably should have the
3528                  * same MTUs. To do this, we'd need to
3529                  * take over the slave's change_mtu
3530                  * function for the duration of their
3531                  * servitude.
3532                  */
3533                 break;
3534         case NETDEV_CHANGENAME:
3535                 /*
3536                  * TODO: handle changing the primary's name
3537                  */
3538                 break;
3539         case NETDEV_FEAT_CHANGE:
3540                 bond_compute_features(bond);
3541                 break;
3542         default:
3543                 break;
3544         }
3545
3546         return NOTIFY_DONE;
3547 }
3548
3549 /*
3550  * bond_netdev_event: handle netdev notifier chain events.
3551  *
3552  * This function receives events for the netdev chain.  The caller (an
3553  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3554  * locks for us to safely manipulate the slave devices (RTNL lock,
3555  * dev_probe_lock).
3556  */
3557 static int bond_netdev_event(struct notifier_block *this,
3558                              unsigned long event, void *ptr)
3559 {
3560         struct net_device *event_dev = (struct net_device *)ptr;
3561
3562         if (dev_net(event_dev) != &init_net)
3563                 return NOTIFY_DONE;
3564
3565         pr_debug("event_dev: %s, event: %lx\n",
3566                 (event_dev ? event_dev->name : "None"),
3567                 event);
3568
3569         if (!(event_dev->priv_flags & IFF_BONDING))
3570                 return NOTIFY_DONE;
3571
3572         if (event_dev->flags & IFF_MASTER) {
3573                 pr_debug("IFF_MASTER\n");
3574                 return bond_master_netdev_event(event, event_dev);
3575         }
3576
3577         if (event_dev->flags & IFF_SLAVE) {
3578                 pr_debug("IFF_SLAVE\n");
3579                 return bond_slave_netdev_event(event, event_dev);
3580         }
3581
3582         return NOTIFY_DONE;
3583 }
3584
3585 /*
3586  * bond_inetaddr_event: handle inetaddr notifier chain events.
3587  *
3588  * We keep track of device IPs primarily to use as source addresses in
3589  * ARP monitor probes (rather than spewing out broadcasts all the time).
3590  *
3591  * We track one IP for the main device (if it has one), plus one per VLAN.
3592  */
3593 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3594 {
3595         struct in_ifaddr *ifa = ptr;
3596         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3597         struct bonding *bond;
3598         struct vlan_entry *vlan;
3599
3600         if (dev_net(ifa->ifa_dev->dev) != &init_net)
3601                 return NOTIFY_DONE;
3602
3603         list_for_each_entry(bond, &bond_dev_list, bond_list) {
3604                 if (bond->dev == event_dev) {
3605                         switch (event) {
3606                         case NETDEV_UP:
3607                                 bond->master_ip = ifa->ifa_local;
3608                                 return NOTIFY_OK;
3609                         case NETDEV_DOWN:
3610                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3611                                 return NOTIFY_OK;
3612                         default:
3613                                 return NOTIFY_DONE;
3614                         }
3615                 }
3616
3617                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3618                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3619                         if (vlan_dev == event_dev) {
3620                                 switch (event) {
3621                                 case NETDEV_UP:
3622                                         vlan->vlan_ip = ifa->ifa_local;
3623                                         return NOTIFY_OK;
3624                                 case NETDEV_DOWN:
3625                                         vlan->vlan_ip =
3626                                                 bond_glean_dev_ip(vlan_dev);
3627                                         return NOTIFY_OK;
3628                                 default:
3629                                         return NOTIFY_DONE;
3630                                 }
3631                         }
3632                 }
3633         }
3634         return NOTIFY_DONE;
3635 }
3636
3637 static struct notifier_block bond_netdev_notifier = {
3638         .notifier_call = bond_netdev_event,
3639 };
3640
3641 static struct notifier_block bond_inetaddr_notifier = {
3642         .notifier_call = bond_inetaddr_event,
3643 };
3644
3645 /*-------------------------- Packet type handling ---------------------------*/
3646
3647 /* register to receive lacpdus on a bond */
3648 static void bond_register_lacpdu(struct bonding *bond)
3649 {
3650         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3651
3652         /* initialize packet type */
3653         pk_type->type = PKT_TYPE_LACPDU;
3654         pk_type->dev = bond->dev;
3655         pk_type->func = bond_3ad_lacpdu_recv;
3656
3657         dev_add_pack(pk_type);
3658 }
3659
3660 /* unregister to receive lacpdus on a bond */
3661 static void bond_unregister_lacpdu(struct bonding *bond)
3662 {
3663         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3664 }
3665
3666 void bond_register_arp(struct bonding *bond)
3667 {
3668         struct packet_type *pt = &bond->arp_mon_pt;
3669
3670         if (pt->type)
3671                 return;
3672
3673         pt->type = htons(ETH_P_ARP);
3674         pt->dev = bond->dev;
3675         pt->func = bond_arp_rcv;
3676         dev_add_pack(pt);
3677 }
3678
3679 void bond_unregister_arp(struct bonding *bond)
3680 {
3681         struct packet_type *pt = &bond->arp_mon_pt;
3682
3683         dev_remove_pack(pt);
3684         pt->type = 0;
3685 }
3686
3687 /*---------------------------- Hashing Policies -----------------------------*/
3688
3689 /*
3690  * Hash for the output device based upon layer 2 and layer 3 data. If
3691  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3692  */
3693 static int bond_xmit_hash_policy_l23(struct sk_buff *skb,
3694                                      struct net_device *bond_dev, int count)
3695 {
3696         struct ethhdr *data = (struct ethhdr *)skb->data;
3697         struct iphdr *iph = ip_hdr(skb);
3698
3699         if (skb->protocol == htons(ETH_P_IP)) {
3700                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3701                         (data->h_dest[5] ^ bond_dev->dev_addr[5])) % count;
3702         }
3703
3704         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3705 }
3706
3707 /*
3708  * Hash for the output device based upon layer 3 and layer 4 data. If
3709  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3710  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3711  */
3712 static int bond_xmit_hash_policy_l34(struct sk_buff *skb,
3713                                     struct net_device *bond_dev, int count)
3714 {
3715         struct ethhdr *data = (struct ethhdr *)skb->data;
3716         struct iphdr *iph = ip_hdr(skb);
3717         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3718         int layer4_xor = 0;
3719
3720         if (skb->protocol == htons(ETH_P_IP)) {
3721                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3722                     (iph->protocol == IPPROTO_TCP ||
3723                      iph->protocol == IPPROTO_UDP)) {
3724                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3725                 }
3726                 return (layer4_xor ^
3727                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3728
3729         }
3730
3731         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3732 }
3733
3734 /*
3735  * Hash for the output device based upon layer 2 data
3736  */
3737 static int bond_xmit_hash_policy_l2(struct sk_buff *skb,
3738                                    struct net_device *bond_dev, int count)
3739 {
3740         struct ethhdr *data = (struct ethhdr *)skb->data;
3741
3742         return (data->h_dest[5] ^ bond_dev->dev_addr[5]) % count;
3743 }
3744
3745 /*-------------------------- Device entry points ----------------------------*/
3746
3747 static int bond_open(struct net_device *bond_dev)
3748 {
3749         struct bonding *bond = netdev_priv(bond_dev);
3750
3751         bond->kill_timers = 0;
3752
3753         if (bond_is_lb(bond)) {
3754                 /* bond_alb_initialize must be called before the timer
3755                  * is started.
3756                  */
3757                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3758                         /* something went wrong - fail the open operation */
3759                         return -1;
3760                 }
3761
3762                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3763                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3764         }
3765
3766         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3767                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3768                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3769         }
3770
3771         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3772                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3773                         INIT_DELAYED_WORK(&bond->arp_work,
3774                                           bond_activebackup_arp_mon);
3775                 else
3776                         INIT_DELAYED_WORK(&bond->arp_work,
3777                                           bond_loadbalance_arp_mon);
3778
3779                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3780                 if (bond->params.arp_validate)
3781                         bond_register_arp(bond);
3782         }
3783
3784         if (bond->params.mode == BOND_MODE_8023AD) {
3785                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3786                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3787                 /* register to receive LACPDUs */
3788                 bond_register_lacpdu(bond);
3789                 bond_3ad_initiate_agg_selection(bond, 1);
3790         }
3791
3792         return 0;
3793 }
3794
3795 static int bond_close(struct net_device *bond_dev)
3796 {
3797         struct bonding *bond = netdev_priv(bond_dev);
3798
3799         if (bond->params.mode == BOND_MODE_8023AD) {
3800                 /* Unregister the receive of LACPDUs */
3801                 bond_unregister_lacpdu(bond);
3802         }
3803
3804         if (bond->params.arp_validate)
3805                 bond_unregister_arp(bond);
3806
3807         write_lock_bh(&bond->lock);
3808
3809         bond->send_grat_arp = 0;
3810         bond->send_unsol_na = 0;
3811
3812         /* signal timers not to re-arm */
3813         bond->kill_timers = 1;
3814
3815         write_unlock_bh(&bond->lock);
3816
3817         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3818                 cancel_delayed_work(&bond->mii_work);
3819         }
3820
3821         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3822                 cancel_delayed_work(&bond->arp_work);
3823         }
3824
3825         switch (bond->params.mode) {
3826         case BOND_MODE_8023AD:
3827                 cancel_delayed_work(&bond->ad_work);
3828                 break;
3829         case BOND_MODE_TLB:
3830         case BOND_MODE_ALB:
3831                 cancel_delayed_work(&bond->alb_work);
3832                 break;
3833         default:
3834                 break;
3835         }
3836
3837
3838         if (bond_is_lb(bond)) {
3839                 /* Must be called only after all
3840                  * slaves have been released
3841                  */
3842                 bond_alb_deinitialize(bond);
3843         }
3844
3845         return 0;
3846 }
3847
3848 static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
3849 {
3850         struct bonding *bond = netdev_priv(bond_dev);
3851         struct net_device_stats *stats = &bond->stats;
3852         struct net_device_stats local_stats;
3853         struct slave *slave;
3854         int i;
3855
3856         memset(&local_stats, 0, sizeof(struct net_device_stats));
3857
3858         read_lock_bh(&bond->lock);
3859
3860         bond_for_each_slave(bond, slave, i) {
3861                 const struct net_device_stats *sstats = dev_get_stats(slave->dev);
3862
3863                 local_stats.rx_packets += sstats->rx_packets;
3864                 local_stats.rx_bytes += sstats->rx_bytes;
3865                 local_stats.rx_errors += sstats->rx_errors;
3866                 local_stats.rx_dropped += sstats->rx_dropped;
3867
3868                 local_stats.tx_packets += sstats->tx_packets;
3869                 local_stats.tx_bytes += sstats->tx_bytes;
3870                 local_stats.tx_errors += sstats->tx_errors;
3871                 local_stats.tx_dropped += sstats->tx_dropped;
3872
3873                 local_stats.multicast += sstats->multicast;
3874                 local_stats.collisions += sstats->collisions;
3875
3876                 local_stats.rx_length_errors += sstats->rx_length_errors;
3877                 local_stats.rx_over_errors += sstats->rx_over_errors;
3878                 local_stats.rx_crc_errors += sstats->rx_crc_errors;
3879                 local_stats.rx_frame_errors += sstats->rx_frame_errors;
3880                 local_stats.rx_fifo_errors += sstats->rx_fifo_errors;
3881                 local_stats.rx_missed_errors += sstats->rx_missed_errors;
3882
3883                 local_stats.tx_aborted_errors += sstats->tx_aborted_errors;
3884                 local_stats.tx_carrier_errors += sstats->tx_carrier_errors;
3885                 local_stats.tx_fifo_errors += sstats->tx_fifo_errors;
3886                 local_stats.tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3887                 local_stats.tx_window_errors += sstats->tx_window_errors;
3888         }
3889
3890         memcpy(stats, &local_stats, sizeof(struct net_device_stats));
3891
3892         read_unlock_bh(&bond->lock);
3893
3894         return stats;
3895 }
3896
3897 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3898 {
3899         struct net_device *slave_dev = NULL;
3900         struct ifbond k_binfo;
3901         struct ifbond __user *u_binfo = NULL;
3902         struct ifslave k_sinfo;
3903         struct ifslave __user *u_sinfo = NULL;
3904         struct mii_ioctl_data *mii = NULL;
3905         int res = 0;
3906
3907         pr_debug("bond_ioctl: master=%s, cmd=%d\n",
3908                 bond_dev->name, cmd);
3909
3910         switch (cmd) {
3911         case SIOCGMIIPHY:
3912                 mii = if_mii(ifr);
3913                 if (!mii)
3914                         return -EINVAL;
3915
3916                 mii->phy_id = 0;
3917                 /* Fall Through */
3918         case SIOCGMIIREG:
3919                 /*
3920                  * We do this again just in case we were called by SIOCGMIIREG
3921                  * instead of SIOCGMIIPHY.
3922                  */
3923                 mii = if_mii(ifr);
3924                 if (!mii)
3925                         return -EINVAL;
3926
3927
3928                 if (mii->reg_num == 1) {
3929                         struct bonding *bond = netdev_priv(bond_dev);
3930                         mii->val_out = 0;
3931                         read_lock(&bond->lock);
3932                         read_lock(&bond->curr_slave_lock);
3933                         if (netif_carrier_ok(bond->dev))
3934                                 mii->val_out = BMSR_LSTATUS;
3935
3936                         read_unlock(&bond->curr_slave_lock);
3937                         read_unlock(&bond->lock);
3938                 }
3939
3940                 return 0;
3941         case BOND_INFO_QUERY_OLD:
3942         case SIOCBONDINFOQUERY:
3943                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3944
3945                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3946                         return -EFAULT;
3947
3948                 res = bond_info_query(bond_dev, &k_binfo);
3949                 if (res == 0 &&
3950                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3951                         return -EFAULT;
3952
3953                 return res;
3954         case BOND_SLAVE_INFO_QUERY_OLD:
3955         case SIOCBONDSLAVEINFOQUERY:
3956                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3957
3958                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3959                         return -EFAULT;
3960
3961                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3962                 if (res == 0 &&
3963                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3964                         return -EFAULT;
3965
3966                 return res;
3967         default:
3968                 /* Go on */
3969                 break;
3970         }
3971
3972         if (!capable(CAP_NET_ADMIN))
3973                 return -EPERM;
3974
3975         slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
3976
3977         pr_debug("slave_dev=%p: \n", slave_dev);
3978
3979         if (!slave_dev)
3980                 res = -ENODEV;
3981         else {
3982                 pr_debug("slave_dev->name=%s: \n", slave_dev->name);
3983                 switch (cmd) {
3984                 case BOND_ENSLAVE_OLD:
3985                 case SIOCBONDENSLAVE:
3986                         res = bond_enslave(bond_dev, slave_dev);
3987                         break;
3988                 case BOND_RELEASE_OLD:
3989                 case SIOCBONDRELEASE:
3990                         res = bond_release(bond_dev, slave_dev);
3991                         break;
3992                 case BOND_SETHWADDR_OLD:
3993                 case SIOCBONDSETHWADDR:
3994                         res = bond_sethwaddr(bond_dev, slave_dev);
3995                         break;
3996                 case BOND_CHANGE_ACTIVE_OLD:
3997                 case SIOCBONDCHANGEACTIVE:
3998                         res = bond_ioctl_change_active(bond_dev, slave_dev);
3999                         break;
4000                 default:
4001                         res = -EOPNOTSUPP;
4002                 }
4003
4004                 dev_put(slave_dev);
4005         }
4006
4007         return res;
4008 }
4009
4010 static void bond_set_multicast_list(struct net_device *bond_dev)
4011 {
4012         struct bonding *bond = netdev_priv(bond_dev);
4013         struct dev_mc_list *dmi;
4014
4015         /*
4016          * Do promisc before checking multicast_mode
4017          */
4018         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4019                 /*
4020                  * FIXME: Need to handle the error when one of the multi-slaves
4021                  * encounters error.
4022                  */
4023                 bond_set_promiscuity(bond, 1);
4024
4025
4026         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4027                 bond_set_promiscuity(bond, -1);
4028
4029
4030         /* set allmulti flag to slaves */
4031         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4032                 /*
4033                  * FIXME: Need to handle the error when one of the multi-slaves
4034                  * encounters error.
4035                  */
4036                 bond_set_allmulti(bond, 1);
4037
4038
4039         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4040                 bond_set_allmulti(bond, -1);
4041
4042
4043         read_lock(&bond->lock);
4044
4045         bond->flags = bond_dev->flags;
4046
4047         /* looking for addresses to add to slaves' mc list */
4048         for (dmi = bond_dev->mc_list; dmi; dmi = dmi->next) {
4049                 if (!bond_mc_list_find_dmi(dmi, bond->mc_list))
4050                         bond_mc_add(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4051         }
4052
4053         /* looking for addresses to delete from slaves' list */
4054         for (dmi = bond->mc_list; dmi; dmi = dmi->next) {
4055                 if (!bond_mc_list_find_dmi(dmi, bond_dev->mc_list))
4056                         bond_mc_delete(bond, dmi->dmi_addr, dmi->dmi_addrlen);
4057         }
4058
4059         /* save master's multicast list */
4060         bond_mc_list_destroy(bond);
4061         bond_mc_list_copy(bond_dev->mc_list, bond, GFP_ATOMIC);
4062
4063         read_unlock(&bond->lock);
4064 }
4065
4066 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4067 {
4068         struct bonding *bond = netdev_priv(dev);
4069         struct slave *slave = bond->first_slave;
4070
4071         if (slave) {
4072                 const struct net_device_ops *slave_ops
4073                         = slave->dev->netdev_ops;
4074                 if (slave_ops->ndo_neigh_setup)
4075                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4076         }
4077         return 0;
4078 }
4079
4080 /*
4081  * Change the MTU of all of a master's slaves to match the master
4082  */
4083 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4084 {
4085         struct bonding *bond = netdev_priv(bond_dev);
4086         struct slave *slave, *stop_at;
4087         int res = 0;
4088         int i;
4089
4090         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4091                 (bond_dev ? bond_dev->name : "None"), new_mtu);
4092
4093         /* Can't hold bond->lock with bh disabled here since
4094          * some base drivers panic. On the other hand we can't
4095          * hold bond->lock without bh disabled because we'll
4096          * deadlock. The only solution is to rely on the fact
4097          * that we're under rtnl_lock here, and the slaves
4098          * list won't change. This doesn't solve the problem
4099          * of setting the slave's MTU while it is
4100          * transmitting, but the assumption is that the base
4101          * driver can handle that.
4102          *
4103          * TODO: figure out a way to safely iterate the slaves
4104          * list, but without holding a lock around the actual
4105          * call to the base driver.
4106          */
4107
4108         bond_for_each_slave(bond, slave, i) {
4109                 pr_debug("s %p s->p %p c_m %p\n", slave,
4110                         slave->prev, slave->dev->netdev_ops->ndo_change_mtu);
4111
4112                 res = dev_set_mtu(slave->dev, new_mtu);
4113
4114                 if (res) {
4115                         /* If we failed to set the slave's mtu to the new value
4116                          * we must abort the operation even in ACTIVE_BACKUP
4117                          * mode, because if we allow the backup slaves to have
4118                          * different mtu values than the active slave we'll
4119                          * need to change their mtu when doing a failover. That
4120                          * means changing their mtu from timer context, which
4121                          * is probably not a good idea.
4122                          */
4123                         pr_debug("err %d %s\n", res, slave->dev->name);
4124                         goto unwind;
4125                 }
4126         }
4127
4128         bond_dev->mtu = new_mtu;
4129
4130         return 0;
4131
4132 unwind:
4133         /* unwind from head to the slave that failed */
4134         stop_at = slave;
4135         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4136                 int tmp_res;
4137
4138                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4139                 if (tmp_res) {
4140                         pr_debug("unwind err %d dev %s\n", tmp_res,
4141                                 slave->dev->name);
4142                 }
4143         }
4144
4145         return res;
4146 }
4147
4148 /*
4149  * Change HW address
4150  *
4151  * Note that many devices must be down to change the HW address, and
4152  * downing the master releases all slaves.  We can make bonds full of
4153  * bonding devices to test this, however.
4154  */
4155 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4156 {
4157         struct bonding *bond = netdev_priv(bond_dev);
4158         struct sockaddr *sa = addr, tmp_sa;
4159         struct slave *slave, *stop_at;
4160         int res = 0;
4161         int i;
4162
4163         if (bond->params.mode == BOND_MODE_ALB)
4164                 return bond_alb_set_mac_address(bond_dev, addr);
4165
4166
4167         pr_debug("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
4168
4169         /*
4170          * If fail_over_mac is set to active, do nothing and return
4171          * success.  Returning an error causes ifenslave to fail.
4172          */
4173         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4174                 return 0;
4175
4176         if (!is_valid_ether_addr(sa->sa_data))
4177                 return -EADDRNOTAVAIL;
4178
4179         /* Can't hold bond->lock with bh disabled here since
4180          * some base drivers panic. On the other hand we can't
4181          * hold bond->lock without bh disabled because we'll
4182          * deadlock. The only solution is to rely on the fact
4183          * that we're under rtnl_lock here, and the slaves
4184          * list won't change. This doesn't solve the problem
4185          * of setting the slave's hw address while it is
4186          * transmitting, but the assumption is that the base
4187          * driver can handle that.
4188          *
4189          * TODO: figure out a way to safely iterate the slaves
4190          * list, but without holding a lock around the actual
4191          * call to the base driver.
4192          */
4193
4194         bond_for_each_slave(bond, slave, i) {
4195                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4196                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4197
4198                 if (slave_ops->ndo_set_mac_address == NULL) {
4199                         res = -EOPNOTSUPP;
4200                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4201                         goto unwind;
4202                 }
4203
4204                 res = dev_set_mac_address(slave->dev, addr);
4205                 if (res) {
4206                         /* TODO: consider downing the slave
4207                          * and retry ?
4208                          * User should expect communications
4209                          * breakage anyway until ARP finish
4210                          * updating, so...
4211                          */
4212                         pr_debug("err %d %s\n", res, slave->dev->name);
4213                         goto unwind;
4214                 }
4215         }
4216
4217         /* success */
4218         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4219         return 0;
4220
4221 unwind:
4222         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4223         tmp_sa.sa_family = bond_dev->type;
4224
4225         /* unwind from head to the slave that failed */
4226         stop_at = slave;
4227         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4228                 int tmp_res;
4229
4230                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4231                 if (tmp_res) {
4232                         pr_debug("unwind err %d dev %s\n", tmp_res,
4233                                 slave->dev->name);
4234                 }
4235         }
4236
4237         return res;
4238 }
4239
4240 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4241 {
4242         struct bonding *bond = netdev_priv(bond_dev);
4243         struct slave *slave, *start_at;
4244         int i, slave_no, res = 1;
4245
4246         read_lock(&bond->lock);
4247
4248         if (!BOND_IS_OK(bond))
4249                 goto out;
4250
4251         /*
4252          * Concurrent TX may collide on rr_tx_counter; we accept that
4253          * as being rare enough not to justify using an atomic op here
4254          */
4255         slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4256
4257         bond_for_each_slave(bond, slave, i) {
4258                 slave_no--;
4259                 if (slave_no < 0)
4260                         break;
4261         }
4262
4263         start_at = slave;
4264         bond_for_each_slave_from(bond, slave, i, start_at) {
4265                 if (IS_UP(slave->dev) &&
4266                     (slave->link == BOND_LINK_UP) &&
4267                     (slave->state == BOND_STATE_ACTIVE)) {
4268                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4269                         break;
4270                 }
4271         }
4272
4273 out:
4274         if (res) {
4275                 /* no suitable interface, frame not sent */
4276                 dev_kfree_skb(skb);
4277         }
4278         read_unlock(&bond->lock);
4279         return 0;
4280 }
4281
4282
4283 /*
4284  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4285  * the bond has a usable interface.
4286  */
4287 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4288 {
4289         struct bonding *bond = netdev_priv(bond_dev);
4290         int res = 1;
4291
4292         read_lock(&bond->lock);
4293         read_lock(&bond->curr_slave_lock);
4294
4295         if (!BOND_IS_OK(bond))
4296                 goto out;
4297
4298         if (!bond->curr_active_slave)
4299                 goto out;
4300
4301         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4302
4303 out:
4304         if (res)
4305                 /* no suitable interface, frame not sent */
4306                 dev_kfree_skb(skb);
4307
4308         read_unlock(&bond->curr_slave_lock);
4309         read_unlock(&bond->lock);
4310         return 0;
4311 }
4312
4313 /*
4314  * In bond_xmit_xor() , we determine the output device by using a pre-
4315  * determined xmit_hash_policy(), If the selected device is not enabled,
4316  * find the next active slave.
4317  */
4318 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4319 {
4320         struct bonding *bond = netdev_priv(bond_dev);
4321         struct slave *slave, *start_at;
4322         int slave_no;
4323         int i;
4324         int res = 1;
4325
4326         read_lock(&bond->lock);
4327
4328         if (!BOND_IS_OK(bond))
4329                 goto out;
4330
4331         slave_no = bond->xmit_hash_policy(skb, bond_dev, bond->slave_cnt);
4332
4333         bond_for_each_slave(bond, slave, i) {
4334                 slave_no--;
4335                 if (slave_no < 0)
4336                         break;
4337         }
4338
4339         start_at = slave;
4340
4341         bond_for_each_slave_from(bond, slave, i, start_at) {
4342                 if (IS_UP(slave->dev) &&
4343                     (slave->link == BOND_LINK_UP) &&
4344                     (slave->state == BOND_STATE_ACTIVE)) {
4345                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4346                         break;
4347                 }
4348         }
4349
4350 out:
4351         if (res) {
4352                 /* no suitable interface, frame not sent */
4353                 dev_kfree_skb(skb);
4354         }
4355         read_unlock(&bond->lock);
4356         return 0;
4357 }
4358
4359 /*
4360  * in broadcast mode, we send everything to all usable interfaces.
4361  */
4362 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4363 {
4364         struct bonding *bond = netdev_priv(bond_dev);
4365         struct slave *slave, *start_at;
4366         struct net_device *tx_dev = NULL;
4367         int i;
4368         int res = 1;
4369
4370         read_lock(&bond->lock);
4371
4372         if (!BOND_IS_OK(bond))
4373                 goto out;
4374
4375         read_lock(&bond->curr_slave_lock);
4376         start_at = bond->curr_active_slave;
4377         read_unlock(&bond->curr_slave_lock);
4378
4379         if (!start_at)
4380                 goto out;
4381
4382         bond_for_each_slave_from(bond, slave, i, start_at) {
4383                 if (IS_UP(slave->dev) &&
4384                     (slave->link == BOND_LINK_UP) &&
4385                     (slave->state == BOND_STATE_ACTIVE)) {
4386                         if (tx_dev) {
4387                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4388                                 if (!skb2) {
4389                                         pr_err(DRV_NAME
4390                                                ": %s: Error: bond_xmit_broadcast(): "
4391                                                "skb_clone() failed\n",
4392                                                bond_dev->name);
4393                                         continue;
4394                                 }
4395
4396                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4397                                 if (res) {
4398                                         dev_kfree_skb(skb2);
4399                                         continue;
4400                                 }
4401                         }
4402                         tx_dev = slave->dev;
4403                 }
4404         }
4405
4406         if (tx_dev)
4407                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4408
4409 out:
4410         if (res)
4411                 /* no suitable interface, frame not sent */
4412                 dev_kfree_skb(skb);
4413
4414         /* frame sent to all suitable interfaces */
4415         read_unlock(&bond->lock);
4416         return 0;
4417 }
4418
4419 /*------------------------- Device initialization ---------------------------*/
4420
4421 static void bond_set_xmit_hash_policy(struct bonding *bond)
4422 {
4423         switch (bond->params.xmit_policy) {
4424         case BOND_XMIT_POLICY_LAYER23:
4425                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4426                 break;
4427         case BOND_XMIT_POLICY_LAYER34:
4428                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4429                 break;
4430         case BOND_XMIT_POLICY_LAYER2:
4431         default:
4432                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4433                 break;
4434         }
4435 }
4436
4437 static int bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4438 {
4439         const struct bonding *bond = netdev_priv(dev);
4440
4441         switch (bond->params.mode) {
4442         case BOND_MODE_ROUNDROBIN:
4443                 return bond_xmit_roundrobin(skb, dev);
4444         case BOND_MODE_ACTIVEBACKUP:
4445                 return bond_xmit_activebackup(skb, dev);
4446         case BOND_MODE_XOR:
4447                 return bond_xmit_xor(skb, dev);
4448         case BOND_MODE_BROADCAST:
4449                 return bond_xmit_broadcast(skb, dev);
4450         case BOND_MODE_8023AD:
4451                 return bond_3ad_xmit_xor(skb, dev);
4452         case BOND_MODE_ALB:
4453         case BOND_MODE_TLB:
4454                 return bond_alb_xmit(skb, dev);
4455         default:
4456                 /* Should never happen, mode already checked */
4457                 pr_err(DRV_NAME ": %s: Error: Unknown bonding mode %d\n",
4458                      dev->name, bond->params.mode);
4459                 WARN_ON_ONCE(1);
4460                 dev_kfree_skb(skb);
4461                 return NETDEV_TX_OK;
4462         }
4463 }
4464
4465
4466 /*
4467  * set bond mode specific net device operations
4468  */
4469 void bond_set_mode_ops(struct bonding *bond, int mode)
4470 {
4471         struct net_device *bond_dev = bond->dev;
4472
4473         switch (mode) {
4474         case BOND_MODE_ROUNDROBIN:
4475                 break;
4476         case BOND_MODE_ACTIVEBACKUP:
4477                 break;
4478         case BOND_MODE_XOR:
4479                 bond_set_xmit_hash_policy(bond);
4480                 break;
4481         case BOND_MODE_BROADCAST:
4482                 break;
4483         case BOND_MODE_8023AD:
4484                 bond_set_master_3ad_flags(bond);
4485                 bond_set_xmit_hash_policy(bond);
4486                 break;
4487         case BOND_MODE_ALB:
4488                 bond_set_master_alb_flags(bond);
4489                 /* FALLTHRU */
4490         case BOND_MODE_TLB:
4491                 break;
4492         default:
4493                 /* Should never happen, mode already checked */
4494                 pr_err(DRV_NAME
4495                        ": %s: Error: Unknown bonding mode %d\n",
4496                        bond_dev->name,
4497                        mode);
4498                 break;
4499         }
4500 }
4501
4502 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4503                                     struct ethtool_drvinfo *drvinfo)
4504 {
4505         strncpy(drvinfo->driver, DRV_NAME, 32);
4506         strncpy(drvinfo->version, DRV_VERSION, 32);
4507         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4508 }
4509
4510 static const struct ethtool_ops bond_ethtool_ops = {
4511         .get_drvinfo            = bond_ethtool_get_drvinfo,
4512         .get_link               = ethtool_op_get_link,
4513         .get_tx_csum            = ethtool_op_get_tx_csum,
4514         .get_sg                 = ethtool_op_get_sg,
4515         .get_tso                = ethtool_op_get_tso,
4516         .get_ufo                = ethtool_op_get_ufo,
4517         .get_flags              = ethtool_op_get_flags,
4518 };
4519
4520 static const struct net_device_ops bond_netdev_ops = {
4521         .ndo_uninit             = bond_uninit,
4522         .ndo_open               = bond_open,
4523         .ndo_stop               = bond_close,
4524         .ndo_start_xmit         = bond_start_xmit,
4525         .ndo_get_stats          = bond_get_stats,
4526         .ndo_do_ioctl           = bond_do_ioctl,
4527         .ndo_set_multicast_list = bond_set_multicast_list,
4528         .ndo_change_mtu         = bond_change_mtu,
4529         .ndo_set_mac_address    = bond_set_mac_address,
4530         .ndo_neigh_setup        = bond_neigh_setup,
4531         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4532         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4533         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4534 };
4535
4536 /*
4537  * Does not allocate but creates a /proc entry.
4538  * Allowed to fail.
4539  */
4540 static int bond_init(struct net_device *bond_dev)
4541 {
4542         struct bonding *bond = netdev_priv(bond_dev);
4543
4544         pr_debug("Begin bond_init for %s\n", bond_dev->name);
4545
4546         /* initialize rwlocks */
4547         rwlock_init(&bond->lock);
4548         rwlock_init(&bond->curr_slave_lock);
4549
4550         bond->params = bonding_defaults;
4551
4552         bond->wq = create_singlethread_workqueue(bond_dev->name);
4553         if (!bond->wq)
4554                 return -ENOMEM;
4555
4556         /* Initialize pointers */
4557         bond->first_slave = NULL;
4558         bond->curr_active_slave = NULL;
4559         bond->current_arp_slave = NULL;
4560         bond->primary_slave = NULL;
4561         bond->dev = bond_dev;
4562         bond->send_grat_arp = 0;
4563         bond->send_unsol_na = 0;
4564         bond->setup_by_slave = 0;
4565         INIT_LIST_HEAD(&bond->vlan_list);
4566
4567         /* Initialize the device entry points */
4568         bond_dev->netdev_ops = &bond_netdev_ops;
4569         bond_dev->ethtool_ops = &bond_ethtool_ops;
4570         bond_set_mode_ops(bond, bond->params.mode);
4571
4572         bond_dev->destructor = free_netdev;
4573
4574         /* Initialize the device options */
4575         bond_dev->tx_queue_len = 0;
4576         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4577         bond_dev->priv_flags |= IFF_BONDING;
4578         if (bond->params.arp_interval)
4579                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4580
4581         /* At first, we block adding VLANs. That's the only way to
4582          * prevent problems that occur when adding VLANs over an
4583          * empty bond. The block will be removed once non-challenged
4584          * slaves are enslaved.
4585          */
4586         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4587
4588         /* don't acquire bond device's netif_tx_lock when
4589          * transmitting */
4590         bond_dev->features |= NETIF_F_LLTX;
4591
4592         /* By default, we declare the bond to be fully
4593          * VLAN hardware accelerated capable. Special
4594          * care is taken in the various xmit functions
4595          * when there are slaves that are not hw accel
4596          * capable
4597          */
4598         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4599                                NETIF_F_HW_VLAN_RX |
4600                                NETIF_F_HW_VLAN_FILTER);
4601
4602         bond_create_proc_entry(bond);
4603         list_add_tail(&bond->bond_list, &bond_dev_list);
4604
4605         return 0;
4606 }
4607
4608 static void bond_work_cancel_all(struct bonding *bond)
4609 {
4610         write_lock_bh(&bond->lock);
4611         bond->kill_timers = 1;
4612         write_unlock_bh(&bond->lock);
4613
4614         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4615                 cancel_delayed_work(&bond->mii_work);
4616
4617         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4618                 cancel_delayed_work(&bond->arp_work);
4619
4620         if (bond->params.mode == BOND_MODE_ALB &&
4621             delayed_work_pending(&bond->alb_work))
4622                 cancel_delayed_work(&bond->alb_work);
4623
4624         if (bond->params.mode == BOND_MODE_8023AD &&
4625             delayed_work_pending(&bond->ad_work))
4626                 cancel_delayed_work(&bond->ad_work);
4627 }
4628
4629 /* De-initialize device specific data.
4630  * Caller must hold rtnl_lock.
4631  */
4632 static void bond_deinit(struct net_device *bond_dev)
4633 {
4634         struct bonding *bond = netdev_priv(bond_dev);
4635
4636         list_del(&bond->bond_list);
4637
4638         bond_work_cancel_all(bond);
4639
4640         bond_remove_proc_entry(bond);
4641 }
4642
4643 /* Unregister and free all bond devices.
4644  * Caller must hold rtnl_lock.
4645  */
4646 static void bond_free_all(void)
4647 {
4648         struct bonding *bond, *nxt;
4649
4650         list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list) {
4651                 struct net_device *bond_dev = bond->dev;
4652
4653                 bond_work_cancel_all(bond);
4654                 /* Release the bonded slaves */
4655                 bond_release_all(bond_dev);
4656                 unregister_netdevice(bond_dev);
4657         }
4658
4659         bond_destroy_proc_dir();
4660 }
4661
4662 /*------------------------- Module initialization ---------------------------*/
4663
4664 /*
4665  * Convert string input module parms.  Accept either the
4666  * number of the mode or its string name.  A bit complicated because
4667  * some mode names are substrings of other names, and calls from sysfs
4668  * may have whitespace in the name (trailing newlines, for example).
4669  */
4670 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4671 {
4672         int modeint = -1, i, rv;
4673         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4674
4675         for (p = (char *)buf; *p; p++)
4676                 if (!(isdigit(*p) || isspace(*p)))
4677                         break;
4678
4679         if (*p)
4680                 rv = sscanf(buf, "%20s", modestr);
4681         else
4682                 rv = sscanf(buf, "%d", &modeint);
4683
4684         if (!rv)
4685                 return -1;
4686
4687         for (i = 0; tbl[i].modename; i++) {
4688                 if (modeint == tbl[i].mode)
4689                         return tbl[i].mode;
4690                 if (strcmp(modestr, tbl[i].modename) == 0)
4691                         return tbl[i].mode;
4692         }
4693
4694         return -1;
4695 }
4696
4697 static int bond_check_params(struct bond_params *params)
4698 {
4699         int arp_validate_value, fail_over_mac_value;
4700
4701         /*
4702          * Convert string parameters.
4703          */
4704         if (mode) {
4705                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4706                 if (bond_mode == -1) {
4707                         pr_err(DRV_NAME
4708                                ": Error: Invalid bonding mode \"%s\"\n",
4709                                mode == NULL ? "NULL" : mode);
4710                         return -EINVAL;
4711                 }
4712         }
4713
4714         if (xmit_hash_policy) {
4715                 if ((bond_mode != BOND_MODE_XOR) &&
4716                     (bond_mode != BOND_MODE_8023AD)) {
4717                         pr_info(DRV_NAME
4718                                ": xor_mode param is irrelevant in mode %s\n",
4719                                bond_mode_name(bond_mode));
4720                 } else {
4721                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4722                                                         xmit_hashtype_tbl);
4723                         if (xmit_hashtype == -1) {
4724                                 pr_err(DRV_NAME
4725                                        ": Error: Invalid xmit_hash_policy \"%s\"\n",
4726                                        xmit_hash_policy == NULL ? "NULL" :
4727                                        xmit_hash_policy);
4728                                 return -EINVAL;
4729                         }
4730                 }
4731         }
4732
4733         if (lacp_rate) {
4734                 if (bond_mode != BOND_MODE_8023AD) {
4735                         pr_info(DRV_NAME
4736                                ": lacp_rate param is irrelevant in mode %s\n",
4737                                bond_mode_name(bond_mode));
4738                 } else {
4739                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4740                         if (lacp_fast == -1) {
4741                                 pr_err(DRV_NAME
4742                                        ": Error: Invalid lacp rate \"%s\"\n",
4743                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4744                                 return -EINVAL;
4745                         }
4746                 }
4747         }
4748
4749         if (ad_select) {
4750                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4751                 if (params->ad_select == -1) {
4752                         pr_err(DRV_NAME
4753                                ": Error: Invalid ad_select \"%s\"\n",
4754                                ad_select == NULL ? "NULL" : ad_select);
4755                         return -EINVAL;
4756                 }
4757
4758                 if (bond_mode != BOND_MODE_8023AD) {
4759                         pr_warning(DRV_NAME
4760                                ": ad_select param only affects 802.3ad mode\n");
4761                 }
4762         } else {
4763                 params->ad_select = BOND_AD_STABLE;
4764         }
4765
4766         if (max_bonds < 0 || max_bonds > INT_MAX) {
4767                 pr_warning(DRV_NAME
4768                        ": Warning: max_bonds (%d) not in range %d-%d, so it "
4769                        "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4770                        max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4771                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4772         }
4773
4774         if (miimon < 0) {
4775                 pr_warning(DRV_NAME
4776                        ": Warning: miimon module parameter (%d), "
4777                        "not in range 0-%d, so it was reset to %d\n",
4778                        miimon, INT_MAX, BOND_LINK_MON_INTERV);
4779                 miimon = BOND_LINK_MON_INTERV;
4780         }
4781
4782         if (updelay < 0) {
4783                 pr_warning(DRV_NAME
4784                        ": Warning: updelay module parameter (%d), "
4785                        "not in range 0-%d, so it was reset to 0\n",
4786                        updelay, INT_MAX);
4787                 updelay = 0;
4788         }
4789
4790         if (downdelay < 0) {
4791                 pr_warning(DRV_NAME
4792                        ": Warning: downdelay module parameter (%d), "
4793                        "not in range 0-%d, so it was reset to 0\n",
4794                        downdelay, INT_MAX);
4795                 downdelay = 0;
4796         }
4797
4798         if ((use_carrier != 0) && (use_carrier != 1)) {
4799                 pr_warning(DRV_NAME
4800                        ": Warning: use_carrier module parameter (%d), "
4801                        "not of valid value (0/1), so it was set to 1\n",
4802                        use_carrier);
4803                 use_carrier = 1;
4804         }
4805
4806         if (num_grat_arp < 0 || num_grat_arp > 255) {
4807                 pr_warning(DRV_NAME
4808                        ": Warning: num_grat_arp (%d) not in range 0-255 so it "
4809                        "was reset to 1 \n", num_grat_arp);
4810                 num_grat_arp = 1;
4811         }
4812
4813         if (num_unsol_na < 0 || num_unsol_na > 255) {
4814                 pr_warning(DRV_NAME
4815                        ": Warning: num_unsol_na (%d) not in range 0-255 so it "
4816                        "was reset to 1 \n", num_unsol_na);
4817                 num_unsol_na = 1;
4818         }
4819
4820         /* reset values for 802.3ad */
4821         if (bond_mode == BOND_MODE_8023AD) {
4822                 if (!miimon) {
4823                         pr_warning(DRV_NAME
4824                                ": Warning: miimon must be specified, "
4825                                "otherwise bonding will not detect link "
4826                                "failure, speed and duplex which are "
4827                                "essential for 802.3ad operation\n");
4828                         pr_warning("Forcing miimon to 100msec\n");
4829                         miimon = 100;
4830                 }
4831         }
4832
4833         /* reset values for TLB/ALB */
4834         if ((bond_mode == BOND_MODE_TLB) ||
4835             (bond_mode == BOND_MODE_ALB)) {
4836                 if (!miimon) {
4837                         pr_warning(DRV_NAME
4838                                ": Warning: miimon must be specified, "
4839                                "otherwise bonding will not detect link "
4840                                "failure and link speed which are essential "
4841                                "for TLB/ALB load balancing\n");
4842                         pr_warning("Forcing miimon to 100msec\n");
4843                         miimon = 100;
4844                 }
4845         }
4846
4847         if (bond_mode == BOND_MODE_ALB) {
4848                 printk(KERN_NOTICE DRV_NAME
4849                        ": In ALB mode you might experience client "
4850                        "disconnections upon reconnection of a link if the "
4851                        "bonding module updelay parameter (%d msec) is "
4852                        "incompatible with the forwarding delay time of the "
4853                        "switch\n",
4854                        updelay);
4855         }
4856
4857         if (!miimon) {
4858                 if (updelay || downdelay) {
4859                         /* just warn the user the up/down delay will have
4860                          * no effect since miimon is zero...
4861                          */
4862                         pr_warning(DRV_NAME
4863                                ": Warning: miimon module parameter not set "
4864                                "and updelay (%d) or downdelay (%d) module "
4865                                "parameter is set; updelay and downdelay have "
4866                                "no effect unless miimon is set\n",
4867                                updelay, downdelay);
4868                 }
4869         } else {
4870                 /* don't allow arp monitoring */
4871                 if (arp_interval) {
4872                         pr_warning(DRV_NAME
4873                                ": Warning: miimon (%d) and arp_interval (%d) "
4874                                "can't be used simultaneously, disabling ARP "
4875                                "monitoring\n",
4876                                miimon, arp_interval);
4877                         arp_interval = 0;
4878                 }
4879
4880                 if ((updelay % miimon) != 0) {
4881                         pr_warning(DRV_NAME
4882                                ": Warning: updelay (%d) is not a multiple "
4883                                "of miimon (%d), updelay rounded to %d ms\n",
4884                                updelay, miimon, (updelay / miimon) * miimon);
4885                 }
4886
4887                 updelay /= miimon;
4888
4889                 if ((downdelay % miimon) != 0) {
4890                         pr_warning(DRV_NAME
4891                                ": Warning: downdelay (%d) is not a multiple "
4892                                "of miimon (%d), downdelay rounded to %d ms\n",
4893                                downdelay, miimon,
4894                                (downdelay / miimon) * miimon);
4895                 }
4896
4897                 downdelay /= miimon;
4898         }
4899
4900         if (arp_interval < 0) {
4901                 pr_warning(DRV_NAME
4902                        ": Warning: arp_interval module parameter (%d) "
4903                        ", not in range 0-%d, so it was reset to %d\n",
4904                        arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4905                 arp_interval = BOND_LINK_ARP_INTERV;
4906         }
4907
4908         for (arp_ip_count = 0;
4909              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4910              arp_ip_count++) {
4911                 /* not complete check, but should be good enough to
4912                    catch mistakes */
4913                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4914                         pr_warning(DRV_NAME
4915                                ": Warning: bad arp_ip_target module parameter "
4916                                "(%s), ARP monitoring will not be performed\n",
4917                                arp_ip_target[arp_ip_count]);
4918                         arp_interval = 0;
4919                 } else {
4920                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4921                         arp_target[arp_ip_count] = ip;
4922                 }
4923         }
4924
4925         if (arp_interval && !arp_ip_count) {
4926                 /* don't allow arping if no arp_ip_target given... */
4927                 pr_warning(DRV_NAME
4928                        ": Warning: arp_interval module parameter (%d) "
4929                        "specified without providing an arp_ip_target "
4930                        "parameter, arp_interval was reset to 0\n",
4931                        arp_interval);
4932                 arp_interval = 0;
4933         }
4934
4935         if (arp_validate) {
4936                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4937                         pr_err(DRV_NAME
4938                                ": arp_validate only supported in active-backup mode\n");
4939                         return -EINVAL;
4940                 }
4941                 if (!arp_interval) {
4942                         pr_err(DRV_NAME
4943                                ": arp_validate requires arp_interval\n");
4944                         return -EINVAL;
4945                 }
4946
4947                 arp_validate_value = bond_parse_parm(arp_validate,
4948                                                      arp_validate_tbl);
4949                 if (arp_validate_value == -1) {
4950                         pr_err(DRV_NAME
4951                                ": Error: invalid arp_validate \"%s\"\n",
4952                                arp_validate == NULL ? "NULL" : arp_validate);
4953                         return -EINVAL;
4954                 }
4955         } else
4956                 arp_validate_value = 0;
4957
4958         if (miimon) {
4959                 pr_info(DRV_NAME
4960                        ": MII link monitoring set to %d ms\n",
4961                        miimon);
4962         } else if (arp_interval) {
4963                 int i;
4964
4965                 pr_info(DRV_NAME ": ARP monitoring set to %d ms,"
4966                        " validate %s, with %d target(s):",
4967                        arp_interval,
4968                        arp_validate_tbl[arp_validate_value].modename,
4969                        arp_ip_count);
4970
4971                 for (i = 0; i < arp_ip_count; i++)
4972                         printk(" %s", arp_ip_target[i]);
4973
4974                 printk("\n");
4975
4976         } else if (max_bonds) {
4977                 /* miimon and arp_interval not set, we need one so things
4978                  * work as expected, see bonding.txt for details
4979                  */
4980                 pr_warning(DRV_NAME
4981                        ": Warning: either miimon or arp_interval and "
4982                        "arp_ip_target module parameters must be specified, "
4983                        "otherwise bonding will not detect link failures! see "
4984                        "bonding.txt for details.\n");
4985         }
4986
4987         if (primary && !USES_PRIMARY(bond_mode)) {
4988                 /* currently, using a primary only makes sense
4989                  * in active backup, TLB or ALB modes
4990                  */
4991                 pr_warning(DRV_NAME
4992                        ": Warning: %s primary device specified but has no "
4993                        "effect in %s mode\n",
4994                        primary, bond_mode_name(bond_mode));
4995                 primary = NULL;
4996         }
4997
4998         if (fail_over_mac) {
4999                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5000                                                       fail_over_mac_tbl);
5001                 if (fail_over_mac_value == -1) {
5002                         pr_err(DRV_NAME
5003                                ": Error: invalid fail_over_mac \"%s\"\n",
5004                                arp_validate == NULL ? "NULL" : arp_validate);
5005                         return -EINVAL;
5006                 }
5007
5008                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5009                         pr_warning(DRV_NAME
5010                                ": Warning: fail_over_mac only affects "
5011                                "active-backup mode.\n");
5012         } else {
5013                 fail_over_mac_value = BOND_FOM_NONE;
5014         }
5015
5016         /* fill params struct with the proper values */
5017         params->mode = bond_mode;
5018         params->xmit_policy = xmit_hashtype;
5019         params->miimon = miimon;
5020         params->num_grat_arp = num_grat_arp;
5021         params->num_unsol_na = num_unsol_na;
5022         params->arp_interval = arp_interval;
5023         params->arp_validate = arp_validate_value;
5024         params->updelay = updelay;
5025         params->downdelay = downdelay;
5026         params->use_carrier = use_carrier;
5027         params->lacp_fast = lacp_fast;
5028         params->primary[0] = 0;
5029         params->fail_over_mac = fail_over_mac_value;
5030
5031         if (primary) {
5032                 strncpy(params->primary, primary, IFNAMSIZ);
5033                 params->primary[IFNAMSIZ - 1] = 0;
5034         }
5035
5036         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5037
5038         return 0;
5039 }
5040
5041 static struct lock_class_key bonding_netdev_xmit_lock_key;
5042 static struct lock_class_key bonding_netdev_addr_lock_key;
5043
5044 static void bond_set_lockdep_class_one(struct net_device *dev,
5045                                        struct netdev_queue *txq,
5046                                        void *_unused)
5047 {
5048         lockdep_set_class(&txq->_xmit_lock,
5049                           &bonding_netdev_xmit_lock_key);
5050 }
5051
5052 static void bond_set_lockdep_class(struct net_device *dev)
5053 {
5054         lockdep_set_class(&dev->addr_list_lock,
5055                           &bonding_netdev_addr_lock_key);
5056         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5057 }
5058
5059 /* Create a new bond based on the specified name and bonding parameters.
5060  * If name is NULL, obtain a suitable "bond%d" name for us.
5061  * Caller must NOT hold rtnl_lock; we need to release it here before we
5062  * set up our sysfs entries.
5063  */
5064 int bond_create(const char *name)
5065 {
5066         struct net_device *bond_dev;
5067         int res;
5068
5069         rtnl_lock();
5070         /* Check to see if the bond already exists. */
5071         /* FIXME: pass netns from caller */
5072         if (name && __dev_get_by_name(&init_net, name)) {
5073                 pr_err(DRV_NAME ": cannot add bond %s; already exists\n",
5074                        name);
5075                 res = -EEXIST;
5076                 goto out_rtnl;
5077         }
5078
5079         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
5080                                 ether_setup);
5081         if (!bond_dev) {
5082                 pr_err(DRV_NAME ": %s: eek! can't alloc netdev!\n",
5083                        name);
5084                 res = -ENOMEM;
5085                 goto out_rtnl;
5086         }
5087
5088         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
5089         if (!name) {
5090                 res = dev_alloc_name(bond_dev, "bond%d");
5091                 if (res < 0)
5092                         goto out_netdev;
5093         }
5094
5095         /* bond_init() must be called after dev_alloc_name() (for the
5096          * /proc files), but before register_netdevice(), because we
5097          * need to set function pointers.
5098          */
5099
5100         res = bond_init(bond_dev);
5101         if (res < 0)
5102                 goto out_netdev;
5103
5104         bond_set_lockdep_class(bond_dev);
5105
5106         netif_carrier_off(bond_dev);
5107
5108         res = register_netdevice(bond_dev);
5109         if (res < 0)
5110                 goto out_bond;
5111
5112         res = bond_create_sysfs_entry(netdev_priv(bond_dev));
5113         if (res < 0)
5114                 goto out_unreg;
5115
5116         rtnl_unlock();
5117         return 0;
5118
5119 out_unreg:
5120         unregister_netdevice(bond_dev);
5121 out_bond:
5122         bond_deinit(bond_dev);
5123 out_netdev:
5124         free_netdev(bond_dev);
5125 out_rtnl:
5126         rtnl_unlock();
5127         return res;
5128 }
5129
5130 static int __init bonding_init(void)
5131 {
5132         int i;
5133         int res;
5134
5135         pr_info("%s", version);
5136
5137         res = bond_check_params(&bonding_defaults);
5138         if (res)
5139                 goto out;
5140
5141         bond_create_proc_dir();
5142
5143         for (i = 0; i < max_bonds; i++) {
5144                 res = bond_create(NULL);
5145                 if (res)
5146                         goto err;
5147         }
5148
5149         res = bond_create_sysfs();
5150         if (res)
5151                 goto err;
5152
5153         register_netdevice_notifier(&bond_netdev_notifier);
5154         register_inetaddr_notifier(&bond_inetaddr_notifier);
5155         bond_register_ipv6_notifier();
5156
5157         goto out;
5158 err:
5159         rtnl_lock();
5160         bond_free_all();
5161         rtnl_unlock();
5162 out:
5163         return res;
5164
5165 }
5166
5167 static void __exit bonding_exit(void)
5168 {
5169         unregister_netdevice_notifier(&bond_netdev_notifier);
5170         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5171         bond_unregister_ipv6_notifier();
5172
5173         bond_destroy_sysfs();
5174
5175         rtnl_lock();
5176         bond_free_all();
5177         rtnl_unlock();
5178 }
5179
5180 module_init(bonding_init);
5181 module_exit(bonding_exit);
5182 MODULE_LICENSE("GPL");
5183 MODULE_VERSION(DRV_VERSION);
5184 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5185 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");