bonding: Change active slave quietly when bond is down
[linux-2.6.git] / drivers / net / bonding / bond_main.c
1 /*
2  * originally based on the dummy device.
3  *
4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6  *
7  * bonding.c: an Ethernet Bonding driver
8  *
9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
10  *      Cisco 5500
11  *      Sun Trunking (Solaris)
12  *      Alteon AceDirector Trunks
13  *      Linux Bonding
14  *      and probably many L2 switches ...
15  *
16  * How it works:
17  *    ifconfig bond0 ipaddress netmask up
18  *      will setup a network device, with an ip address.  No mac address
19  *      will be assigned at this time.  The hw mac address will come from
20  *      the first slave bonded to the channel.  All slaves will then use
21  *      this hw mac address.
22  *
23  *    ifconfig bond0 down
24  *         will release all slaves, marking them as down.
25  *
26  *    ifenslave bond0 eth0
27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
28  *      a: be used as initial mac address
29  *      b: if a hw mac address already is there, eth0's hw mac address
30  *         will then be set from bond0.
31  *
32  */
33
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
43 #include <linux/in.h>
44 #include <net/ip.h>
45 #include <linux/ip.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
56 #include <linux/io.h>
57 #include <asm/system.h>
58 #include <asm/dma.h>
59 #include <linux/uaccess.h>
60 #include <linux/errno.h>
61 #include <linux/netdevice.h>
62 #include <linux/netpoll.h>
63 #include <linux/inetdevice.h>
64 #include <linux/igmp.h>
65 #include <linux/etherdevice.h>
66 #include <linux/skbuff.h>
67 #include <net/sock.h>
68 #include <linux/rtnetlink.h>
69 #include <linux/proc_fs.h>
70 #include <linux/seq_file.h>
71 #include <linux/smp.h>
72 #include <linux/if_ether.h>
73 #include <net/arp.h>
74 #include <linux/mii.h>
75 #include <linux/ethtool.h>
76 #include <linux/if_vlan.h>
77 #include <linux/if_bonding.h>
78 #include <linux/jiffies.h>
79 #include <linux/preempt.h>
80 #include <net/route.h>
81 #include <net/net_namespace.h>
82 #include <net/netns/generic.h>
83 #include "bonding.h"
84 #include "bond_3ad.h"
85 #include "bond_alb.h"
86
87 /*---------------------------- Module parameters ----------------------------*/
88
89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
90 #define BOND_LINK_MON_INTERV    0
91 #define BOND_LINK_ARP_INTERV    0
92
93 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
94 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
95 static int num_grat_arp = 1;
96 static int num_unsol_na = 1;
97 static int miimon       = BOND_LINK_MON_INTERV;
98 static int updelay;
99 static int downdelay;
100 static int use_carrier  = 1;
101 static char *mode;
102 static char *primary;
103 static char *primary_reselect;
104 static char *lacp_rate;
105 static char *ad_select;
106 static char *xmit_hash_policy;
107 static int arp_interval = BOND_LINK_ARP_INTERV;
108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
109 static char *arp_validate;
110 static char *fail_over_mac;
111 static int all_slaves_active = 0;
112 static struct bond_params bonding_defaults;
113 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
114
115 module_param(max_bonds, int, 0);
116 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
117 module_param(tx_queues, int, 0);
118 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
119 module_param(num_grat_arp, int, 0644);
120 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
121 module_param(num_unsol_na, int, 0644);
122 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
123 module_param(miimon, int, 0);
124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
125 module_param(updelay, int, 0);
126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
127 module_param(downdelay, int, 0);
128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
129                             "in milliseconds");
130 module_param(use_carrier, int, 0);
131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
132                               "0 for off, 1 for on (default)");
133 module_param(mode, charp, 0);
134 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
135                        "1 for active-backup, 2 for balance-xor, "
136                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
137                        "6 for balance-alb");
138 module_param(primary, charp, 0);
139 MODULE_PARM_DESC(primary, "Primary network device to use");
140 module_param(primary_reselect, charp, 0);
141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
142                                    "once it comes up; "
143                                    "0 for always (default), "
144                                    "1 for only if speed of primary is "
145                                    "better, "
146                                    "2 for only on active slave "
147                                    "failure");
148 module_param(lacp_rate, charp, 0);
149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
150                             "(slow/fast)");
151 module_param(ad_select, charp, 0);
152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
153 module_param(xmit_hash_policy, charp, 0);
154 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
155                                    ", 1 for layer 3+4");
156 module_param(arp_interval, int, 0);
157 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
158 module_param_array(arp_ip_target, charp, NULL, 0);
159 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
160 module_param(arp_validate, charp, 0);
161 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
162 module_param(fail_over_mac, charp, 0);
163 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC.  none (default), active or follow");
164 module_param(all_slaves_active, int, 0);
165 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
166                                      "by setting active flag for all slaves.  "
167                                      "0 for never (default), 1 for always.");
168 module_param(resend_igmp, int, 0);
169 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
170
171 /*----------------------------- Global variables ----------------------------*/
172
173 #ifdef CONFIG_NET_POLL_CONTROLLER
174 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
175 #endif
176
177 static const char * const version =
178         DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n";
179
180 int bond_net_id __read_mostly;
181
182 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
183 static int arp_ip_count;
184 static int bond_mode    = BOND_MODE_ROUNDROBIN;
185 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
186 static int lacp_fast;
187
188 const struct bond_parm_tbl bond_lacp_tbl[] = {
189 {       "slow",         AD_LACP_SLOW},
190 {       "fast",         AD_LACP_FAST},
191 {       NULL,           -1},
192 };
193
194 const struct bond_parm_tbl bond_mode_tbl[] = {
195 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
196 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
197 {       "balance-xor",          BOND_MODE_XOR},
198 {       "broadcast",            BOND_MODE_BROADCAST},
199 {       "802.3ad",              BOND_MODE_8023AD},
200 {       "balance-tlb",          BOND_MODE_TLB},
201 {       "balance-alb",          BOND_MODE_ALB},
202 {       NULL,                   -1},
203 };
204
205 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
206 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
207 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
208 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
209 {       NULL,                   -1},
210 };
211
212 const struct bond_parm_tbl arp_validate_tbl[] = {
213 {       "none",                 BOND_ARP_VALIDATE_NONE},
214 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
215 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
216 {       "all",                  BOND_ARP_VALIDATE_ALL},
217 {       NULL,                   -1},
218 };
219
220 const struct bond_parm_tbl fail_over_mac_tbl[] = {
221 {       "none",                 BOND_FOM_NONE},
222 {       "active",               BOND_FOM_ACTIVE},
223 {       "follow",               BOND_FOM_FOLLOW},
224 {       NULL,                   -1},
225 };
226
227 const struct bond_parm_tbl pri_reselect_tbl[] = {
228 {       "always",               BOND_PRI_RESELECT_ALWAYS},
229 {       "better",               BOND_PRI_RESELECT_BETTER},
230 {       "failure",              BOND_PRI_RESELECT_FAILURE},
231 {       NULL,                   -1},
232 };
233
234 struct bond_parm_tbl ad_select_tbl[] = {
235 {       "stable",       BOND_AD_STABLE},
236 {       "bandwidth",    BOND_AD_BANDWIDTH},
237 {       "count",        BOND_AD_COUNT},
238 {       NULL,           -1},
239 };
240
241 /*-------------------------- Forward declarations ---------------------------*/
242
243 static void bond_send_gratuitous_arp(struct bonding *bond);
244 static int bond_init(struct net_device *bond_dev);
245 static void bond_uninit(struct net_device *bond_dev);
246
247 /*---------------------------- General routines -----------------------------*/
248
249 static const char *bond_mode_name(int mode)
250 {
251         static const char *names[] = {
252                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
253                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
254                 [BOND_MODE_XOR] = "load balancing (xor)",
255                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
256                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
257                 [BOND_MODE_TLB] = "transmit load balancing",
258                 [BOND_MODE_ALB] = "adaptive load balancing",
259         };
260
261         if (mode < 0 || mode > BOND_MODE_ALB)
262                 return "unknown";
263
264         return names[mode];
265 }
266
267 /*---------------------------------- VLAN -----------------------------------*/
268
269 /**
270  * bond_add_vlan - add a new vlan id on bond
271  * @bond: bond that got the notification
272  * @vlan_id: the vlan id to add
273  *
274  * Returns -ENOMEM if allocation failed.
275  */
276 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
277 {
278         struct vlan_entry *vlan;
279
280         pr_debug("bond: %s, vlan id %d\n",
281                  (bond ? bond->dev->name : "None"), vlan_id);
282
283         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
284         if (!vlan)
285                 return -ENOMEM;
286
287         INIT_LIST_HEAD(&vlan->vlan_list);
288         vlan->vlan_id = vlan_id;
289
290         write_lock_bh(&bond->lock);
291
292         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
293
294         write_unlock_bh(&bond->lock);
295
296         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
297
298         return 0;
299 }
300
301 /**
302  * bond_del_vlan - delete a vlan id from bond
303  * @bond: bond that got the notification
304  * @vlan_id: the vlan id to delete
305  *
306  * returns -ENODEV if @vlan_id was not found in @bond.
307  */
308 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
309 {
310         struct vlan_entry *vlan;
311         int res = -ENODEV;
312
313         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
314
315         block_netpoll_tx();
316         write_lock_bh(&bond->lock);
317
318         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
319                 if (vlan->vlan_id == vlan_id) {
320                         list_del(&vlan->vlan_list);
321
322                         if (bond_is_lb(bond))
323                                 bond_alb_clear_vlan(bond, vlan_id);
324
325                         pr_debug("removed VLAN ID %d from bond %s\n",
326                                  vlan_id, bond->dev->name);
327
328                         kfree(vlan);
329
330                         if (list_empty(&bond->vlan_list) &&
331                             (bond->slave_cnt == 0)) {
332                                 /* Last VLAN removed and no slaves, so
333                                  * restore block on adding VLANs. This will
334                                  * be removed once new slaves that are not
335                                  * VLAN challenged will be added.
336                                  */
337                                 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
338                         }
339
340                         res = 0;
341                         goto out;
342                 }
343         }
344
345         pr_debug("couldn't find VLAN ID %d in bond %s\n",
346                  vlan_id, bond->dev->name);
347
348 out:
349         write_unlock_bh(&bond->lock);
350         unblock_netpoll_tx();
351         return res;
352 }
353
354 /**
355  * bond_has_challenged_slaves
356  * @bond: the bond we're working on
357  *
358  * Searches the slave list. Returns 1 if a vlan challenged slave
359  * was found, 0 otherwise.
360  *
361  * Assumes bond->lock is held.
362  */
363 static int bond_has_challenged_slaves(struct bonding *bond)
364 {
365         struct slave *slave;
366         int i;
367
368         bond_for_each_slave(bond, slave, i) {
369                 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
370                         pr_debug("found VLAN challenged slave - %s\n",
371                                  slave->dev->name);
372                         return 1;
373                 }
374         }
375
376         pr_debug("no VLAN challenged slaves found\n");
377         return 0;
378 }
379
380 /**
381  * bond_next_vlan - safely skip to the next item in the vlans list.
382  * @bond: the bond we're working on
383  * @curr: item we're advancing from
384  *
385  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
386  * or @curr->next otherwise (even if it is @curr itself again).
387  *
388  * Caller must hold bond->lock
389  */
390 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
391 {
392         struct vlan_entry *next, *last;
393
394         if (list_empty(&bond->vlan_list))
395                 return NULL;
396
397         if (!curr) {
398                 next = list_entry(bond->vlan_list.next,
399                                   struct vlan_entry, vlan_list);
400         } else {
401                 last = list_entry(bond->vlan_list.prev,
402                                   struct vlan_entry, vlan_list);
403                 if (last == curr) {
404                         next = list_entry(bond->vlan_list.next,
405                                           struct vlan_entry, vlan_list);
406                 } else {
407                         next = list_entry(curr->vlan_list.next,
408                                           struct vlan_entry, vlan_list);
409                 }
410         }
411
412         return next;
413 }
414
415 /**
416  * bond_dev_queue_xmit - Prepare skb for xmit.
417  *
418  * @bond: bond device that got this skb for tx.
419  * @skb: hw accel VLAN tagged skb to transmit
420  * @slave_dev: slave that is supposed to xmit this skbuff
421  */
422 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
423                         struct net_device *slave_dev)
424 {
425         skb->dev = slave_dev;
426         skb->priority = 1;
427 #ifdef CONFIG_NET_POLL_CONTROLLER
428         if (unlikely(bond->dev->priv_flags & IFF_IN_NETPOLL)) {
429                 struct netpoll *np = bond->dev->npinfo->netpoll;
430                 slave_dev->npinfo = bond->dev->npinfo;
431                 slave_dev->priv_flags |= IFF_IN_NETPOLL;
432                 netpoll_send_skb_on_dev(np, skb, slave_dev);
433                 slave_dev->priv_flags &= ~IFF_IN_NETPOLL;
434         } else
435 #endif
436                 dev_queue_xmit(skb);
437
438         return 0;
439 }
440
441 /*
442  * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
443  * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
444  * lock because:
445  * a. This operation is performed in IOCTL context,
446  * b. The operation is protected by the RTNL semaphore in the 8021q code,
447  * c. Holding a lock with BH disabled while directly calling a base driver
448  *    entry point is generally a BAD idea.
449  *
450  * The design of synchronization/protection for this operation in the 8021q
451  * module is good for one or more VLAN devices over a single physical device
452  * and cannot be extended for a teaming solution like bonding, so there is a
453  * potential race condition here where a net device from the vlan group might
454  * be referenced (either by a base driver or the 8021q code) while it is being
455  * removed from the system. However, it turns out we're not making matters
456  * worse, and if it works for regular VLAN usage it will work here too.
457 */
458
459 /**
460  * bond_vlan_rx_register - Propagates registration to slaves
461  * @bond_dev: bonding net device that got called
462  * @grp: vlan group being registered
463  */
464 static void bond_vlan_rx_register(struct net_device *bond_dev,
465                                   struct vlan_group *grp)
466 {
467         struct bonding *bond = netdev_priv(bond_dev);
468         struct slave *slave;
469         int i;
470
471         write_lock_bh(&bond->lock);
472         bond->vlgrp = grp;
473         write_unlock_bh(&bond->lock);
474
475         bond_for_each_slave(bond, slave, i) {
476                 struct net_device *slave_dev = slave->dev;
477                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
478
479                 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
480                     slave_ops->ndo_vlan_rx_register) {
481                         slave_ops->ndo_vlan_rx_register(slave_dev, grp);
482                 }
483         }
484 }
485
486 /**
487  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
488  * @bond_dev: bonding net device that got called
489  * @vid: vlan id being added
490  */
491 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
492 {
493         struct bonding *bond = netdev_priv(bond_dev);
494         struct slave *slave;
495         int i, res;
496
497         bond_for_each_slave(bond, slave, i) {
498                 struct net_device *slave_dev = slave->dev;
499                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
500
501                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
502                     slave_ops->ndo_vlan_rx_add_vid) {
503                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
504                 }
505         }
506
507         res = bond_add_vlan(bond, vid);
508         if (res) {
509                 pr_err("%s: Error: Failed to add vlan id %d\n",
510                        bond_dev->name, vid);
511         }
512 }
513
514 /**
515  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
516  * @bond_dev: bonding net device that got called
517  * @vid: vlan id being removed
518  */
519 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
520 {
521         struct bonding *bond = netdev_priv(bond_dev);
522         struct slave *slave;
523         struct net_device *vlan_dev;
524         int i, res;
525
526         bond_for_each_slave(bond, slave, i) {
527                 struct net_device *slave_dev = slave->dev;
528                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
529
530                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
531                     slave_ops->ndo_vlan_rx_kill_vid) {
532                         /* Save and then restore vlan_dev in the grp array,
533                          * since the slave's driver might clear it.
534                          */
535                         vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
536                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
537                         vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
538                 }
539         }
540
541         res = bond_del_vlan(bond, vid);
542         if (res) {
543                 pr_err("%s: Error: Failed to remove vlan id %d\n",
544                        bond_dev->name, vid);
545         }
546 }
547
548 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
549 {
550         struct vlan_entry *vlan;
551         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
552
553         if (!bond->vlgrp)
554                 return;
555
556         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
557             slave_ops->ndo_vlan_rx_register)
558                 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
559
560         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
561             !(slave_ops->ndo_vlan_rx_add_vid))
562                 return;
563
564         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
565                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
566 }
567
568 static void bond_del_vlans_from_slave(struct bonding *bond,
569                                       struct net_device *slave_dev)
570 {
571         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
572         struct vlan_entry *vlan;
573         struct net_device *vlan_dev;
574
575         if (!bond->vlgrp)
576                 return;
577
578         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
579             !(slave_ops->ndo_vlan_rx_kill_vid))
580                 goto unreg;
581
582         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
583                 if (!vlan->vlan_id)
584                         continue;
585                 /* Save and then restore vlan_dev in the grp array,
586                  * since the slave's driver might clear it.
587                  */
588                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
589                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
590                 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
591         }
592
593 unreg:
594         if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
595             slave_ops->ndo_vlan_rx_register)
596                 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
597 }
598
599 /*------------------------------- Link status -------------------------------*/
600
601 /*
602  * Set the carrier state for the master according to the state of its
603  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
604  * do special 802.3ad magic.
605  *
606  * Returns zero if carrier state does not change, nonzero if it does.
607  */
608 static int bond_set_carrier(struct bonding *bond)
609 {
610         struct slave *slave;
611         int i;
612
613         if (bond->slave_cnt == 0)
614                 goto down;
615
616         if (bond->params.mode == BOND_MODE_8023AD)
617                 return bond_3ad_set_carrier(bond);
618
619         bond_for_each_slave(bond, slave, i) {
620                 if (slave->link == BOND_LINK_UP) {
621                         if (!netif_carrier_ok(bond->dev)) {
622                                 netif_carrier_on(bond->dev);
623                                 return 1;
624                         }
625                         return 0;
626                 }
627         }
628
629 down:
630         if (netif_carrier_ok(bond->dev)) {
631                 netif_carrier_off(bond->dev);
632                 return 1;
633         }
634         return 0;
635 }
636
637 /*
638  * Get link speed and duplex from the slave's base driver
639  * using ethtool. If for some reason the call fails or the
640  * values are invalid, fake speed and duplex to 100/Full
641  * and return error.
642  */
643 static int bond_update_speed_duplex(struct slave *slave)
644 {
645         struct net_device *slave_dev = slave->dev;
646         struct ethtool_cmd etool;
647         int res;
648
649         /* Fake speed and duplex */
650         slave->speed = SPEED_100;
651         slave->duplex = DUPLEX_FULL;
652
653         if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
654                 return -1;
655
656         res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
657         if (res < 0)
658                 return -1;
659
660         switch (etool.speed) {
661         case SPEED_10:
662         case SPEED_100:
663         case SPEED_1000:
664         case SPEED_10000:
665                 break;
666         default:
667                 return -1;
668         }
669
670         switch (etool.duplex) {
671         case DUPLEX_FULL:
672         case DUPLEX_HALF:
673                 break;
674         default:
675                 return -1;
676         }
677
678         slave->speed = etool.speed;
679         slave->duplex = etool.duplex;
680
681         return 0;
682 }
683
684 /*
685  * if <dev> supports MII link status reporting, check its link status.
686  *
687  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
688  * depending upon the setting of the use_carrier parameter.
689  *
690  * Return either BMSR_LSTATUS, meaning that the link is up (or we
691  * can't tell and just pretend it is), or 0, meaning that the link is
692  * down.
693  *
694  * If reporting is non-zero, instead of faking link up, return -1 if
695  * both ETHTOOL and MII ioctls fail (meaning the device does not
696  * support them).  If use_carrier is set, return whatever it says.
697  * It'd be nice if there was a good way to tell if a driver supports
698  * netif_carrier, but there really isn't.
699  */
700 static int bond_check_dev_link(struct bonding *bond,
701                                struct net_device *slave_dev, int reporting)
702 {
703         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
704         int (*ioctl)(struct net_device *, struct ifreq *, int);
705         struct ifreq ifr;
706         struct mii_ioctl_data *mii;
707
708         if (!reporting && !netif_running(slave_dev))
709                 return 0;
710
711         if (bond->params.use_carrier)
712                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
713
714         /* Try to get link status using Ethtool first. */
715         if (slave_dev->ethtool_ops) {
716                 if (slave_dev->ethtool_ops->get_link) {
717                         u32 link;
718
719                         link = slave_dev->ethtool_ops->get_link(slave_dev);
720
721                         return link ? BMSR_LSTATUS : 0;
722                 }
723         }
724
725         /* Ethtool can't be used, fallback to MII ioctls. */
726         ioctl = slave_ops->ndo_do_ioctl;
727         if (ioctl) {
728                 /* TODO: set pointer to correct ioctl on a per team member */
729                 /*       bases to make this more efficient. that is, once  */
730                 /*       we determine the correct ioctl, we will always    */
731                 /*       call it and not the others for that team          */
732                 /*       member.                                           */
733
734                 /*
735                  * We cannot assume that SIOCGMIIPHY will also read a
736                  * register; not all network drivers (e.g., e100)
737                  * support that.
738                  */
739
740                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
741                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
742                 mii = if_mii(&ifr);
743                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
744                         mii->reg_num = MII_BMSR;
745                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
746                                 return mii->val_out & BMSR_LSTATUS;
747                 }
748         }
749
750         /*
751          * If reporting, report that either there's no dev->do_ioctl,
752          * or both SIOCGMIIREG and get_link failed (meaning that we
753          * cannot report link status).  If not reporting, pretend
754          * we're ok.
755          */
756         return reporting ? -1 : BMSR_LSTATUS;
757 }
758
759 /*----------------------------- Multicast list ------------------------------*/
760
761 /*
762  * Push the promiscuity flag down to appropriate slaves
763  */
764 static int bond_set_promiscuity(struct bonding *bond, int inc)
765 {
766         int err = 0;
767         if (USES_PRIMARY(bond->params.mode)) {
768                 /* write lock already acquired */
769                 if (bond->curr_active_slave) {
770                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
771                                                   inc);
772                 }
773         } else {
774                 struct slave *slave;
775                 int i;
776                 bond_for_each_slave(bond, slave, i) {
777                         err = dev_set_promiscuity(slave->dev, inc);
778                         if (err)
779                                 return err;
780                 }
781         }
782         return err;
783 }
784
785 /*
786  * Push the allmulti flag down to all slaves
787  */
788 static int bond_set_allmulti(struct bonding *bond, int inc)
789 {
790         int err = 0;
791         if (USES_PRIMARY(bond->params.mode)) {
792                 /* write lock already acquired */
793                 if (bond->curr_active_slave) {
794                         err = dev_set_allmulti(bond->curr_active_slave->dev,
795                                                inc);
796                 }
797         } else {
798                 struct slave *slave;
799                 int i;
800                 bond_for_each_slave(bond, slave, i) {
801                         err = dev_set_allmulti(slave->dev, inc);
802                         if (err)
803                                 return err;
804                 }
805         }
806         return err;
807 }
808
809 /*
810  * Add a Multicast address to slaves
811  * according to mode
812  */
813 static void bond_mc_add(struct bonding *bond, void *addr)
814 {
815         if (USES_PRIMARY(bond->params.mode)) {
816                 /* write lock already acquired */
817                 if (bond->curr_active_slave)
818                         dev_mc_add(bond->curr_active_slave->dev, addr);
819         } else {
820                 struct slave *slave;
821                 int i;
822
823                 bond_for_each_slave(bond, slave, i)
824                         dev_mc_add(slave->dev, addr);
825         }
826 }
827
828 /*
829  * Remove a multicast address from slave
830  * according to mode
831  */
832 static void bond_mc_del(struct bonding *bond, void *addr)
833 {
834         if (USES_PRIMARY(bond->params.mode)) {
835                 /* write lock already acquired */
836                 if (bond->curr_active_slave)
837                         dev_mc_del(bond->curr_active_slave->dev, addr);
838         } else {
839                 struct slave *slave;
840                 int i;
841                 bond_for_each_slave(bond, slave, i) {
842                         dev_mc_del(slave->dev, addr);
843                 }
844         }
845 }
846
847
848 static void __bond_resend_igmp_join_requests(struct net_device *dev)
849 {
850         struct in_device *in_dev;
851         struct ip_mc_list *im;
852
853         rcu_read_lock();
854         in_dev = __in_dev_get_rcu(dev);
855         if (in_dev) {
856                 read_lock(&in_dev->mc_list_lock);
857                 for (im = in_dev->mc_list; im; im = im->next)
858                         ip_mc_rejoin_group(im);
859                 read_unlock(&in_dev->mc_list_lock);
860         }
861
862         rcu_read_unlock();
863 }
864
865 /*
866  * Retrieve the list of registered multicast addresses for the bonding
867  * device and retransmit an IGMP JOIN request to the current active
868  * slave.
869  */
870 static void bond_resend_igmp_join_requests(struct bonding *bond)
871 {
872         struct net_device *vlan_dev;
873         struct vlan_entry *vlan;
874
875         read_lock(&bond->lock);
876
877         /* rejoin all groups on bond device */
878         __bond_resend_igmp_join_requests(bond->dev);
879
880         /* rejoin all groups on vlan devices */
881         if (bond->vlgrp) {
882                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
883                         vlan_dev = vlan_group_get_device(bond->vlgrp,
884                                                          vlan->vlan_id);
885                         if (vlan_dev)
886                                 __bond_resend_igmp_join_requests(vlan_dev);
887                 }
888         }
889
890         if (--bond->igmp_retrans > 0)
891                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
892
893         read_unlock(&bond->lock);
894 }
895
896 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
897 {
898         struct bonding *bond = container_of(work, struct bonding,
899                                                         mcast_work.work);
900         bond_resend_igmp_join_requests(bond);
901 }
902
903 /*
904  * flush all members of flush->mc_list from device dev->mc_list
905  */
906 static void bond_mc_list_flush(struct net_device *bond_dev,
907                                struct net_device *slave_dev)
908 {
909         struct bonding *bond = netdev_priv(bond_dev);
910         struct netdev_hw_addr *ha;
911
912         netdev_for_each_mc_addr(ha, bond_dev)
913                 dev_mc_del(slave_dev, ha->addr);
914
915         if (bond->params.mode == BOND_MODE_8023AD) {
916                 /* del lacpdu mc addr from mc list */
917                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
918
919                 dev_mc_del(slave_dev, lacpdu_multicast);
920         }
921 }
922
923 /*--------------------------- Active slave change ---------------------------*/
924
925 /*
926  * Update the mc list and multicast-related flags for the new and
927  * old active slaves (if any) according to the multicast mode, and
928  * promiscuous flags unconditionally.
929  */
930 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
931                          struct slave *old_active)
932 {
933         struct netdev_hw_addr *ha;
934
935         if (!USES_PRIMARY(bond->params.mode))
936                 /* nothing to do -  mc list is already up-to-date on
937                  * all slaves
938                  */
939                 return;
940
941         if (old_active) {
942                 if (bond->dev->flags & IFF_PROMISC)
943                         dev_set_promiscuity(old_active->dev, -1);
944
945                 if (bond->dev->flags & IFF_ALLMULTI)
946                         dev_set_allmulti(old_active->dev, -1);
947
948                 netdev_for_each_mc_addr(ha, bond->dev)
949                         dev_mc_del(old_active->dev, ha->addr);
950         }
951
952         if (new_active) {
953                 /* FIXME: Signal errors upstream. */
954                 if (bond->dev->flags & IFF_PROMISC)
955                         dev_set_promiscuity(new_active->dev, 1);
956
957                 if (bond->dev->flags & IFF_ALLMULTI)
958                         dev_set_allmulti(new_active->dev, 1);
959
960                 netdev_for_each_mc_addr(ha, bond->dev)
961                         dev_mc_add(new_active->dev, ha->addr);
962         }
963 }
964
965 /*
966  * bond_do_fail_over_mac
967  *
968  * Perform special MAC address swapping for fail_over_mac settings
969  *
970  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
971  */
972 static void bond_do_fail_over_mac(struct bonding *bond,
973                                   struct slave *new_active,
974                                   struct slave *old_active)
975         __releases(&bond->curr_slave_lock)
976         __releases(&bond->lock)
977         __acquires(&bond->lock)
978         __acquires(&bond->curr_slave_lock)
979 {
980         u8 tmp_mac[ETH_ALEN];
981         struct sockaddr saddr;
982         int rv;
983
984         switch (bond->params.fail_over_mac) {
985         case BOND_FOM_ACTIVE:
986                 if (new_active)
987                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
988                                new_active->dev->addr_len);
989                 break;
990         case BOND_FOM_FOLLOW:
991                 /*
992                  * if new_active && old_active, swap them
993                  * if just old_active, do nothing (going to no active slave)
994                  * if just new_active, set new_active to bond's MAC
995                  */
996                 if (!new_active)
997                         return;
998
999                 write_unlock_bh(&bond->curr_slave_lock);
1000                 read_unlock(&bond->lock);
1001
1002                 if (old_active) {
1003                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
1004                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
1005                                ETH_ALEN);
1006                         saddr.sa_family = new_active->dev->type;
1007                 } else {
1008                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
1009                         saddr.sa_family = bond->dev->type;
1010                 }
1011
1012                 rv = dev_set_mac_address(new_active->dev, &saddr);
1013                 if (rv) {
1014                         pr_err("%s: Error %d setting MAC of slave %s\n",
1015                                bond->dev->name, -rv, new_active->dev->name);
1016                         goto out;
1017                 }
1018
1019                 if (!old_active)
1020                         goto out;
1021
1022                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1023                 saddr.sa_family = old_active->dev->type;
1024
1025                 rv = dev_set_mac_address(old_active->dev, &saddr);
1026                 if (rv)
1027                         pr_err("%s: Error %d setting MAC of slave %s\n",
1028                                bond->dev->name, -rv, new_active->dev->name);
1029 out:
1030                 read_lock(&bond->lock);
1031                 write_lock_bh(&bond->curr_slave_lock);
1032                 break;
1033         default:
1034                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1035                        bond->dev->name, bond->params.fail_over_mac);
1036                 break;
1037         }
1038
1039 }
1040
1041 static bool bond_should_change_active(struct bonding *bond)
1042 {
1043         struct slave *prim = bond->primary_slave;
1044         struct slave *curr = bond->curr_active_slave;
1045
1046         if (!prim || !curr || curr->link != BOND_LINK_UP)
1047                 return true;
1048         if (bond->force_primary) {
1049                 bond->force_primary = false;
1050                 return true;
1051         }
1052         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1053             (prim->speed < curr->speed ||
1054              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1055                 return false;
1056         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1057                 return false;
1058         return true;
1059 }
1060
1061 /**
1062  * find_best_interface - select the best available slave to be the active one
1063  * @bond: our bonding struct
1064  *
1065  * Warning: Caller must hold curr_slave_lock for writing.
1066  */
1067 static struct slave *bond_find_best_slave(struct bonding *bond)
1068 {
1069         struct slave *new_active, *old_active;
1070         struct slave *bestslave = NULL;
1071         int mintime = bond->params.updelay;
1072         int i;
1073
1074         new_active = bond->curr_active_slave;
1075
1076         if (!new_active) { /* there were no active slaves left */
1077                 if (bond->slave_cnt > 0)   /* found one slave */
1078                         new_active = bond->first_slave;
1079                 else
1080                         return NULL; /* still no slave, return NULL */
1081         }
1082
1083         if ((bond->primary_slave) &&
1084             bond->primary_slave->link == BOND_LINK_UP &&
1085             bond_should_change_active(bond)) {
1086                 new_active = bond->primary_slave;
1087         }
1088
1089         /* remember where to stop iterating over the slaves */
1090         old_active = new_active;
1091
1092         bond_for_each_slave_from(bond, new_active, i, old_active) {
1093                 if (new_active->link == BOND_LINK_UP) {
1094                         return new_active;
1095                 } else if (new_active->link == BOND_LINK_BACK &&
1096                            IS_UP(new_active->dev)) {
1097                         /* link up, but waiting for stabilization */
1098                         if (new_active->delay < mintime) {
1099                                 mintime = new_active->delay;
1100                                 bestslave = new_active;
1101                         }
1102                 }
1103         }
1104
1105         return bestslave;
1106 }
1107
1108 /**
1109  * change_active_interface - change the active slave into the specified one
1110  * @bond: our bonding struct
1111  * @new: the new slave to make the active one
1112  *
1113  * Set the new slave to the bond's settings and unset them on the old
1114  * curr_active_slave.
1115  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1116  *
1117  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1118  * because it is apparently the best available slave we have, even though its
1119  * updelay hasn't timed out yet.
1120  *
1121  * If new_active is not NULL, caller must hold bond->lock for read and
1122  * curr_slave_lock for write_bh.
1123  */
1124 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1125 {
1126         struct slave *old_active = bond->curr_active_slave;
1127
1128         if (old_active == new_active)
1129                 return;
1130
1131         if (new_active) {
1132                 new_active->jiffies = jiffies;
1133
1134                 if (new_active->link == BOND_LINK_BACK) {
1135                         if (USES_PRIMARY(bond->params.mode)) {
1136                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1137                                         bond->dev->name, new_active->dev->name,
1138                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1139                         }
1140
1141                         new_active->delay = 0;
1142                         new_active->link = BOND_LINK_UP;
1143
1144                         if (bond->params.mode == BOND_MODE_8023AD)
1145                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1146
1147                         if (bond_is_lb(bond))
1148                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1149                 } else {
1150                         if (USES_PRIMARY(bond->params.mode)) {
1151                                 pr_info("%s: making interface %s the new active one.\n",
1152                                         bond->dev->name, new_active->dev->name);
1153                         }
1154                 }
1155         }
1156
1157         if (USES_PRIMARY(bond->params.mode))
1158                 bond_mc_swap(bond, new_active, old_active);
1159
1160         if (bond_is_lb(bond)) {
1161                 bond_alb_handle_active_change(bond, new_active);
1162                 if (old_active)
1163                         bond_set_slave_inactive_flags(old_active);
1164                 if (new_active)
1165                         bond_set_slave_active_flags(new_active);
1166         } else {
1167                 bond->curr_active_slave = new_active;
1168         }
1169
1170         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1171                 if (old_active)
1172                         bond_set_slave_inactive_flags(old_active);
1173
1174                 if (new_active) {
1175                         bond_set_slave_active_flags(new_active);
1176
1177                         if (bond->params.fail_over_mac)
1178                                 bond_do_fail_over_mac(bond, new_active,
1179                                                       old_active);
1180
1181                         if (netif_running(bond->dev)) {
1182                                 bond->send_grat_arp = bond->params.num_grat_arp;
1183                                 bond_send_gratuitous_arp(bond);
1184
1185                                 bond->send_unsol_na = bond->params.num_unsol_na;
1186                                 bond_send_unsolicited_na(bond);
1187                         }
1188
1189                         write_unlock_bh(&bond->curr_slave_lock);
1190                         read_unlock(&bond->lock);
1191
1192                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1193
1194                         read_lock(&bond->lock);
1195                         write_lock_bh(&bond->curr_slave_lock);
1196                 }
1197         }
1198
1199         /* resend IGMP joins since active slave has changed or
1200          * all were sent on curr_active_slave */
1201         if (((USES_PRIMARY(bond->params.mode) && new_active) ||
1202              bond->params.mode == BOND_MODE_ROUNDROBIN) &&
1203             netif_running(bond->dev)) {
1204                 bond->igmp_retrans = bond->params.resend_igmp;
1205                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1206         }
1207 }
1208
1209 /**
1210  * bond_select_active_slave - select a new active slave, if needed
1211  * @bond: our bonding struct
1212  *
1213  * This functions should be called when one of the following occurs:
1214  * - The old curr_active_slave has been released or lost its link.
1215  * - The primary_slave has got its link back.
1216  * - A slave has got its link back and there's no old curr_active_slave.
1217  *
1218  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1219  */
1220 void bond_select_active_slave(struct bonding *bond)
1221 {
1222         struct slave *best_slave;
1223         int rv;
1224
1225         best_slave = bond_find_best_slave(bond);
1226         if (best_slave != bond->curr_active_slave) {
1227                 bond_change_active_slave(bond, best_slave);
1228                 rv = bond_set_carrier(bond);
1229                 if (!rv)
1230                         return;
1231
1232                 if (netif_carrier_ok(bond->dev)) {
1233                         pr_info("%s: first active interface up!\n",
1234                                 bond->dev->name);
1235                 } else {
1236                         pr_info("%s: now running without any active interface !\n",
1237                                 bond->dev->name);
1238                 }
1239         }
1240 }
1241
1242 /*--------------------------- slave list handling ---------------------------*/
1243
1244 /*
1245  * This function attaches the slave to the end of list.
1246  *
1247  * bond->lock held for writing by caller.
1248  */
1249 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1250 {
1251         if (bond->first_slave == NULL) { /* attaching the first slave */
1252                 new_slave->next = new_slave;
1253                 new_slave->prev = new_slave;
1254                 bond->first_slave = new_slave;
1255         } else {
1256                 new_slave->next = bond->first_slave;
1257                 new_slave->prev = bond->first_slave->prev;
1258                 new_slave->next->prev = new_slave;
1259                 new_slave->prev->next = new_slave;
1260         }
1261
1262         bond->slave_cnt++;
1263 }
1264
1265 /*
1266  * This function detaches the slave from the list.
1267  * WARNING: no check is made to verify if the slave effectively
1268  * belongs to <bond>.
1269  * Nothing is freed on return, structures are just unchained.
1270  * If any slave pointer in bond was pointing to <slave>,
1271  * it should be changed by the calling function.
1272  *
1273  * bond->lock held for writing by caller.
1274  */
1275 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1276 {
1277         if (slave->next)
1278                 slave->next->prev = slave->prev;
1279
1280         if (slave->prev)
1281                 slave->prev->next = slave->next;
1282
1283         if (bond->first_slave == slave) { /* slave is the first slave */
1284                 if (bond->slave_cnt > 1) { /* there are more slave */
1285                         bond->first_slave = slave->next;
1286                 } else {
1287                         bond->first_slave = NULL; /* slave was the last one */
1288                 }
1289         }
1290
1291         slave->next = NULL;
1292         slave->prev = NULL;
1293         bond->slave_cnt--;
1294 }
1295
1296 #ifdef CONFIG_NET_POLL_CONTROLLER
1297 /*
1298  * You must hold read lock on bond->lock before calling this.
1299  */
1300 static bool slaves_support_netpoll(struct net_device *bond_dev)
1301 {
1302         struct bonding *bond = netdev_priv(bond_dev);
1303         struct slave *slave;
1304         int i = 0;
1305         bool ret = true;
1306
1307         bond_for_each_slave(bond, slave, i) {
1308                 if ((slave->dev->priv_flags & IFF_DISABLE_NETPOLL) ||
1309                     !slave->dev->netdev_ops->ndo_poll_controller)
1310                         ret = false;
1311         }
1312         return i != 0 && ret;
1313 }
1314
1315 static void bond_poll_controller(struct net_device *bond_dev)
1316 {
1317         struct bonding *bond = netdev_priv(bond_dev);
1318         struct slave *slave;
1319         int i;
1320
1321         bond_for_each_slave(bond, slave, i) {
1322                 if (slave->dev && IS_UP(slave->dev))
1323                         netpoll_poll_dev(slave->dev);
1324         }
1325 }
1326
1327 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1328 {
1329         struct bonding *bond = netdev_priv(bond_dev);
1330         struct slave *slave;
1331         const struct net_device_ops *ops;
1332         int i;
1333
1334         read_lock(&bond->lock);
1335         bond_dev->npinfo = NULL;
1336         bond_for_each_slave(bond, slave, i) {
1337                 if (slave->dev) {
1338                         ops = slave->dev->netdev_ops;
1339                         if (ops->ndo_netpoll_cleanup)
1340                                 ops->ndo_netpoll_cleanup(slave->dev);
1341                         else
1342                                 slave->dev->npinfo = NULL;
1343                 }
1344         }
1345         read_unlock(&bond->lock);
1346 }
1347
1348 #else
1349
1350 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1351 {
1352 }
1353
1354 #endif
1355
1356 /*---------------------------------- IOCTL ----------------------------------*/
1357
1358 static int bond_sethwaddr(struct net_device *bond_dev,
1359                           struct net_device *slave_dev)
1360 {
1361         pr_debug("bond_dev=%p\n", bond_dev);
1362         pr_debug("slave_dev=%p\n", slave_dev);
1363         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1364         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1365         return 0;
1366 }
1367
1368 #define BOND_VLAN_FEATURES \
1369         (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1370          NETIF_F_HW_VLAN_FILTER)
1371
1372 /*
1373  * Compute the common dev->feature set available to all slaves.  Some
1374  * feature bits are managed elsewhere, so preserve those feature bits
1375  * on the master device.
1376  */
1377 static int bond_compute_features(struct bonding *bond)
1378 {
1379         struct slave *slave;
1380         struct net_device *bond_dev = bond->dev;
1381         unsigned long features = bond_dev->features;
1382         unsigned long vlan_features = 0;
1383         unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1384                                                 bond_dev->hard_header_len);
1385         int i;
1386
1387         features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1388         features |=  NETIF_F_GSO_MASK | NETIF_F_NO_CSUM;
1389
1390         if (!bond->first_slave)
1391                 goto done;
1392
1393         features &= ~NETIF_F_ONE_FOR_ALL;
1394
1395         vlan_features = bond->first_slave->dev->vlan_features;
1396         bond_for_each_slave(bond, slave, i) {
1397                 features = netdev_increment_features(features,
1398                                                      slave->dev->features,
1399                                                      NETIF_F_ONE_FOR_ALL);
1400                 vlan_features = netdev_increment_features(vlan_features,
1401                                                         slave->dev->vlan_features,
1402                                                         NETIF_F_ONE_FOR_ALL);
1403                 if (slave->dev->hard_header_len > max_hard_header_len)
1404                         max_hard_header_len = slave->dev->hard_header_len;
1405         }
1406
1407 done:
1408         features |= (bond_dev->features & BOND_VLAN_FEATURES);
1409         bond_dev->features = netdev_fix_features(features, NULL);
1410         bond_dev->vlan_features = netdev_fix_features(vlan_features, NULL);
1411         bond_dev->hard_header_len = max_hard_header_len;
1412
1413         return 0;
1414 }
1415
1416 static void bond_setup_by_slave(struct net_device *bond_dev,
1417                                 struct net_device *slave_dev)
1418 {
1419         struct bonding *bond = netdev_priv(bond_dev);
1420
1421         bond_dev->header_ops        = slave_dev->header_ops;
1422
1423         bond_dev->type              = slave_dev->type;
1424         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1425         bond_dev->addr_len          = slave_dev->addr_len;
1426
1427         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1428                 slave_dev->addr_len);
1429         bond->setup_by_slave = 1;
1430 }
1431
1432 /* enslave device <slave> to bond device <master> */
1433 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1434 {
1435         struct bonding *bond = netdev_priv(bond_dev);
1436         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1437         struct slave *new_slave = NULL;
1438         struct netdev_hw_addr *ha;
1439         struct sockaddr addr;
1440         int link_reporting;
1441         int old_features = bond_dev->features;
1442         int res = 0;
1443
1444         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1445                 slave_ops->ndo_do_ioctl == NULL) {
1446                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1447                            bond_dev->name, slave_dev->name);
1448         }
1449
1450         /* bond must be initialized by bond_open() before enslaving */
1451         if (!(bond_dev->flags & IFF_UP)) {
1452                 pr_warning("%s: master_dev is not up in bond_enslave\n",
1453                            bond_dev->name);
1454         }
1455
1456         /* already enslaved */
1457         if (slave_dev->flags & IFF_SLAVE) {
1458                 pr_debug("Error, Device was already enslaved\n");
1459                 return -EBUSY;
1460         }
1461
1462         /* vlan challenged mutual exclusion */
1463         /* no need to lock since we're protected by rtnl_lock */
1464         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1465                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1466                 if (bond->vlgrp) {
1467                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1468                                bond_dev->name, slave_dev->name, bond_dev->name);
1469                         return -EPERM;
1470                 } else {
1471                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1472                                    bond_dev->name, slave_dev->name,
1473                                    slave_dev->name, bond_dev->name);
1474                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1475                 }
1476         } else {
1477                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1478                 if (bond->slave_cnt == 0) {
1479                         /* First slave, and it is not VLAN challenged,
1480                          * so remove the block of adding VLANs over the bond.
1481                          */
1482                         bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1483                 }
1484         }
1485
1486         /*
1487          * Old ifenslave binaries are no longer supported.  These can
1488          * be identified with moderate accuracy by the state of the slave:
1489          * the current ifenslave will set the interface down prior to
1490          * enslaving it; the old ifenslave will not.
1491          */
1492         if ((slave_dev->flags & IFF_UP)) {
1493                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1494                        slave_dev->name);
1495                 res = -EPERM;
1496                 goto err_undo_flags;
1497         }
1498
1499         /* set bonding device ether type by slave - bonding netdevices are
1500          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1501          * there is a need to override some of the type dependent attribs/funcs.
1502          *
1503          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1504          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1505          */
1506         if (bond->slave_cnt == 0) {
1507                 if (bond_dev->type != slave_dev->type) {
1508                         pr_debug("%s: change device type from %d to %d\n",
1509                                  bond_dev->name,
1510                                  bond_dev->type, slave_dev->type);
1511
1512                         res = netdev_bonding_change(bond_dev,
1513                                                     NETDEV_PRE_TYPE_CHANGE);
1514                         res = notifier_to_errno(res);
1515                         if (res) {
1516                                 pr_err("%s: refused to change device type\n",
1517                                        bond_dev->name);
1518                                 res = -EBUSY;
1519                                 goto err_undo_flags;
1520                         }
1521
1522                         /* Flush unicast and multicast addresses */
1523                         dev_uc_flush(bond_dev);
1524                         dev_mc_flush(bond_dev);
1525
1526                         if (slave_dev->type != ARPHRD_ETHER)
1527                                 bond_setup_by_slave(bond_dev, slave_dev);
1528                         else
1529                                 ether_setup(bond_dev);
1530
1531                         netdev_bonding_change(bond_dev,
1532                                               NETDEV_POST_TYPE_CHANGE);
1533                 }
1534         } else if (bond_dev->type != slave_dev->type) {
1535                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1536                        slave_dev->name,
1537                        slave_dev->type, bond_dev->type);
1538                 res = -EINVAL;
1539                 goto err_undo_flags;
1540         }
1541
1542         if (slave_ops->ndo_set_mac_address == NULL) {
1543                 if (bond->slave_cnt == 0) {
1544                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1545                                    bond_dev->name);
1546                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1547                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1548                         pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1549                                bond_dev->name);
1550                         res = -EOPNOTSUPP;
1551                         goto err_undo_flags;
1552                 }
1553         }
1554
1555         /* If this is the first slave, then we need to set the master's hardware
1556          * address to be the same as the slave's. */
1557         if (is_zero_ether_addr(bond->dev->dev_addr))
1558                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1559                        slave_dev->addr_len);
1560
1561
1562         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1563         if (!new_slave) {
1564                 res = -ENOMEM;
1565                 goto err_undo_flags;
1566         }
1567
1568         /*
1569          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1570          * is set via sysfs or module option if desired.
1571          */
1572         new_slave->queue_id = 0;
1573
1574         /* Save slave's original mtu and then set it to match the bond */
1575         new_slave->original_mtu = slave_dev->mtu;
1576         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1577         if (res) {
1578                 pr_debug("Error %d calling dev_set_mtu\n", res);
1579                 goto err_free;
1580         }
1581
1582         /*
1583          * Save slave's original ("permanent") mac address for modes
1584          * that need it, and for restoring it upon release, and then
1585          * set it to the master's address
1586          */
1587         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1588
1589         if (!bond->params.fail_over_mac) {
1590                 /*
1591                  * Set slave to master's mac address.  The application already
1592                  * set the master's mac address to that of the first slave
1593                  */
1594                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1595                 addr.sa_family = slave_dev->type;
1596                 res = dev_set_mac_address(slave_dev, &addr);
1597                 if (res) {
1598                         pr_debug("Error %d calling set_mac_address\n", res);
1599                         goto err_restore_mtu;
1600                 }
1601         }
1602
1603         res = netdev_set_master(slave_dev, bond_dev);
1604         if (res) {
1605                 pr_debug("Error %d calling netdev_set_master\n", res);
1606                 goto err_restore_mac;
1607         }
1608         /* open the slave since the application closed it */
1609         res = dev_open(slave_dev);
1610         if (res) {
1611                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1612                 goto err_unset_master;
1613         }
1614
1615         new_slave->dev = slave_dev;
1616         slave_dev->priv_flags |= IFF_BONDING;
1617
1618         if (bond_is_lb(bond)) {
1619                 /* bond_alb_init_slave() must be called before all other stages since
1620                  * it might fail and we do not want to have to undo everything
1621                  */
1622                 res = bond_alb_init_slave(bond, new_slave);
1623                 if (res)
1624                         goto err_close;
1625         }
1626
1627         /* If the mode USES_PRIMARY, then the new slave gets the
1628          * master's promisc (and mc) settings only if it becomes the
1629          * curr_active_slave, and that is taken care of later when calling
1630          * bond_change_active()
1631          */
1632         if (!USES_PRIMARY(bond->params.mode)) {
1633                 /* set promiscuity level to new slave */
1634                 if (bond_dev->flags & IFF_PROMISC) {
1635                         res = dev_set_promiscuity(slave_dev, 1);
1636                         if (res)
1637                                 goto err_close;
1638                 }
1639
1640                 /* set allmulti level to new slave */
1641                 if (bond_dev->flags & IFF_ALLMULTI) {
1642                         res = dev_set_allmulti(slave_dev, 1);
1643                         if (res)
1644                                 goto err_close;
1645                 }
1646
1647                 netif_addr_lock_bh(bond_dev);
1648                 /* upload master's mc_list to new slave */
1649                 netdev_for_each_mc_addr(ha, bond_dev)
1650                         dev_mc_add(slave_dev, ha->addr);
1651                 netif_addr_unlock_bh(bond_dev);
1652         }
1653
1654         if (bond->params.mode == BOND_MODE_8023AD) {
1655                 /* add lacpdu mc addr to mc list */
1656                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1657
1658                 dev_mc_add(slave_dev, lacpdu_multicast);
1659         }
1660
1661         bond_add_vlans_on_slave(bond, slave_dev);
1662
1663         write_lock_bh(&bond->lock);
1664
1665         bond_attach_slave(bond, new_slave);
1666
1667         new_slave->delay = 0;
1668         new_slave->link_failure_count = 0;
1669
1670         bond_compute_features(bond);
1671
1672         write_unlock_bh(&bond->lock);
1673
1674         read_lock(&bond->lock);
1675
1676         new_slave->last_arp_rx = jiffies;
1677
1678         if (bond->params.miimon && !bond->params.use_carrier) {
1679                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1680
1681                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1682                         /*
1683                          * miimon is set but a bonded network driver
1684                          * does not support ETHTOOL/MII and
1685                          * arp_interval is not set.  Note: if
1686                          * use_carrier is enabled, we will never go
1687                          * here (because netif_carrier is always
1688                          * supported); thus, we don't need to change
1689                          * the messages for netif_carrier.
1690                          */
1691                         pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1692                                bond_dev->name, slave_dev->name);
1693                 } else if (link_reporting == -1) {
1694                         /* unable get link status using mii/ethtool */
1695                         pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1696                                    bond_dev->name, slave_dev->name);
1697                 }
1698         }
1699
1700         /* check for initial state */
1701         if (!bond->params.miimon ||
1702             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1703                 if (bond->params.updelay) {
1704                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1705                         new_slave->link  = BOND_LINK_BACK;
1706                         new_slave->delay = bond->params.updelay;
1707                 } else {
1708                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1709                         new_slave->link  = BOND_LINK_UP;
1710                 }
1711                 new_slave->jiffies = jiffies;
1712         } else {
1713                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1714                 new_slave->link  = BOND_LINK_DOWN;
1715         }
1716
1717         if (bond_update_speed_duplex(new_slave) &&
1718             (new_slave->link != BOND_LINK_DOWN)) {
1719                 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1720                            bond_dev->name, new_slave->dev->name);
1721
1722                 if (bond->params.mode == BOND_MODE_8023AD) {
1723                         pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1724                                    bond_dev->name);
1725                 }
1726         }
1727
1728         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1729                 /* if there is a primary slave, remember it */
1730                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1731                         bond->primary_slave = new_slave;
1732                         bond->force_primary = true;
1733                 }
1734         }
1735
1736         write_lock_bh(&bond->curr_slave_lock);
1737
1738         switch (bond->params.mode) {
1739         case BOND_MODE_ACTIVEBACKUP:
1740                 bond_set_slave_inactive_flags(new_slave);
1741                 bond_select_active_slave(bond);
1742                 break;
1743         case BOND_MODE_8023AD:
1744                 /* in 802.3ad mode, the internal mechanism
1745                  * will activate the slaves in the selected
1746                  * aggregator
1747                  */
1748                 bond_set_slave_inactive_flags(new_slave);
1749                 /* if this is the first slave */
1750                 if (bond->slave_cnt == 1) {
1751                         SLAVE_AD_INFO(new_slave).id = 1;
1752                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1753                          * can be called only after the mac address of the bond is set
1754                          */
1755                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1756                                             bond->params.lacp_fast);
1757                 } else {
1758                         SLAVE_AD_INFO(new_slave).id =
1759                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1760                 }
1761
1762                 bond_3ad_bind_slave(new_slave);
1763                 break;
1764         case BOND_MODE_TLB:
1765         case BOND_MODE_ALB:
1766                 new_slave->state = BOND_STATE_ACTIVE;
1767                 bond_set_slave_inactive_flags(new_slave);
1768                 bond_select_active_slave(bond);
1769                 break;
1770         default:
1771                 pr_debug("This slave is always active in trunk mode\n");
1772
1773                 /* always active in trunk mode */
1774                 new_slave->state = BOND_STATE_ACTIVE;
1775
1776                 /* In trunking mode there is little meaning to curr_active_slave
1777                  * anyway (it holds no special properties of the bond device),
1778                  * so we can change it without calling change_active_interface()
1779                  */
1780                 if (!bond->curr_active_slave)
1781                         bond->curr_active_slave = new_slave;
1782
1783                 break;
1784         } /* switch(bond_mode) */
1785
1786         write_unlock_bh(&bond->curr_slave_lock);
1787
1788         bond_set_carrier(bond);
1789
1790 #ifdef CONFIG_NET_POLL_CONTROLLER
1791         if (slaves_support_netpoll(bond_dev)) {
1792                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
1793                 if (bond_dev->npinfo)
1794                         slave_dev->npinfo = bond_dev->npinfo;
1795         } else if (!(bond_dev->priv_flags & IFF_DISABLE_NETPOLL)) {
1796                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1797                 pr_info("New slave device %s does not support netpoll\n",
1798                         slave_dev->name);
1799                 pr_info("Disabling netpoll support for %s\n", bond_dev->name);
1800         }
1801 #endif
1802         read_unlock(&bond->lock);
1803
1804         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1805         if (res)
1806                 goto err_close;
1807
1808         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1809                 bond_dev->name, slave_dev->name,
1810                 new_slave->state == BOND_STATE_ACTIVE ? "n active" : " backup",
1811                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1812
1813         /* enslave is successful */
1814         return 0;
1815
1816 /* Undo stages on error */
1817 err_close:
1818         dev_close(slave_dev);
1819
1820 err_unset_master:
1821         netdev_set_master(slave_dev, NULL);
1822
1823 err_restore_mac:
1824         if (!bond->params.fail_over_mac) {
1825                 /* XXX TODO - fom follow mode needs to change master's
1826                  * MAC if this slave's MAC is in use by the bond, or at
1827                  * least print a warning.
1828                  */
1829                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1830                 addr.sa_family = slave_dev->type;
1831                 dev_set_mac_address(slave_dev, &addr);
1832         }
1833
1834 err_restore_mtu:
1835         dev_set_mtu(slave_dev, new_slave->original_mtu);
1836
1837 err_free:
1838         kfree(new_slave);
1839
1840 err_undo_flags:
1841         bond_dev->features = old_features;
1842
1843         return res;
1844 }
1845
1846 /*
1847  * Try to release the slave device <slave> from the bond device <master>
1848  * It is legal to access curr_active_slave without a lock because all the function
1849  * is write-locked.
1850  *
1851  * The rules for slave state should be:
1852  *   for Active/Backup:
1853  *     Active stays on all backups go down
1854  *   for Bonded connections:
1855  *     The first up interface should be left on and all others downed.
1856  */
1857 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1858 {
1859         struct bonding *bond = netdev_priv(bond_dev);
1860         struct slave *slave, *oldcurrent;
1861         struct sockaddr addr;
1862
1863         /* slave is not a slave or master is not master of this slave */
1864         if (!(slave_dev->flags & IFF_SLAVE) ||
1865             (slave_dev->master != bond_dev)) {
1866                 pr_err("%s: Error: cannot release %s.\n",
1867                        bond_dev->name, slave_dev->name);
1868                 return -EINVAL;
1869         }
1870
1871         block_netpoll_tx();
1872         netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1873         write_lock_bh(&bond->lock);
1874
1875         slave = bond_get_slave_by_dev(bond, slave_dev);
1876         if (!slave) {
1877                 /* not a slave of this bond */
1878                 pr_info("%s: %s not enslaved\n",
1879                         bond_dev->name, slave_dev->name);
1880                 write_unlock_bh(&bond->lock);
1881                 unblock_netpoll_tx();
1882                 return -EINVAL;
1883         }
1884
1885         if (!bond->params.fail_over_mac) {
1886                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1887                     bond->slave_cnt > 1)
1888                         pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1889                                    bond_dev->name, slave_dev->name,
1890                                    slave->perm_hwaddr,
1891                                    bond_dev->name, slave_dev->name);
1892         }
1893
1894         /* Inform AD package of unbinding of slave. */
1895         if (bond->params.mode == BOND_MODE_8023AD) {
1896                 /* must be called before the slave is
1897                  * detached from the list
1898                  */
1899                 bond_3ad_unbind_slave(slave);
1900         }
1901
1902         pr_info("%s: releasing %s interface %s\n",
1903                 bond_dev->name,
1904                 (slave->state == BOND_STATE_ACTIVE) ? "active" : "backup",
1905                 slave_dev->name);
1906
1907         oldcurrent = bond->curr_active_slave;
1908
1909         bond->current_arp_slave = NULL;
1910
1911         /* release the slave from its bond */
1912         bond_detach_slave(bond, slave);
1913
1914         bond_compute_features(bond);
1915
1916         if (bond->primary_slave == slave)
1917                 bond->primary_slave = NULL;
1918
1919         if (oldcurrent == slave)
1920                 bond_change_active_slave(bond, NULL);
1921
1922         if (bond_is_lb(bond)) {
1923                 /* Must be called only after the slave has been
1924                  * detached from the list and the curr_active_slave
1925                  * has been cleared (if our_slave == old_current),
1926                  * but before a new active slave is selected.
1927                  */
1928                 write_unlock_bh(&bond->lock);
1929                 bond_alb_deinit_slave(bond, slave);
1930                 write_lock_bh(&bond->lock);
1931         }
1932
1933         if (oldcurrent == slave) {
1934                 /*
1935                  * Note that we hold RTNL over this sequence, so there
1936                  * is no concern that another slave add/remove event
1937                  * will interfere.
1938                  */
1939                 write_unlock_bh(&bond->lock);
1940                 read_lock(&bond->lock);
1941                 write_lock_bh(&bond->curr_slave_lock);
1942
1943                 bond_select_active_slave(bond);
1944
1945                 write_unlock_bh(&bond->curr_slave_lock);
1946                 read_unlock(&bond->lock);
1947                 write_lock_bh(&bond->lock);
1948         }
1949
1950         if (bond->slave_cnt == 0) {
1951                 bond_set_carrier(bond);
1952
1953                 /* if the last slave was removed, zero the mac address
1954                  * of the master so it will be set by the application
1955                  * to the mac address of the first slave
1956                  */
1957                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
1958
1959                 if (!bond->vlgrp) {
1960                         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1961                 } else {
1962                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1963                                    bond_dev->name, bond_dev->name);
1964                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1965                                    bond_dev->name);
1966                 }
1967         } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1968                    !bond_has_challenged_slaves(bond)) {
1969                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1970                         bond_dev->name, slave_dev->name, bond_dev->name);
1971                 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1972         }
1973
1974         write_unlock_bh(&bond->lock);
1975         unblock_netpoll_tx();
1976
1977         /* must do this from outside any spinlocks */
1978         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1979
1980         bond_del_vlans_from_slave(bond, slave_dev);
1981
1982         /* If the mode USES_PRIMARY, then we should only remove its
1983          * promisc and mc settings if it was the curr_active_slave, but that was
1984          * already taken care of above when we detached the slave
1985          */
1986         if (!USES_PRIMARY(bond->params.mode)) {
1987                 /* unset promiscuity level from slave */
1988                 if (bond_dev->flags & IFF_PROMISC)
1989                         dev_set_promiscuity(slave_dev, -1);
1990
1991                 /* unset allmulti level from slave */
1992                 if (bond_dev->flags & IFF_ALLMULTI)
1993                         dev_set_allmulti(slave_dev, -1);
1994
1995                 /* flush master's mc_list from slave */
1996                 netif_addr_lock_bh(bond_dev);
1997                 bond_mc_list_flush(bond_dev, slave_dev);
1998                 netif_addr_unlock_bh(bond_dev);
1999         }
2000
2001         netdev_set_master(slave_dev, NULL);
2002
2003 #ifdef CONFIG_NET_POLL_CONTROLLER
2004         read_lock_bh(&bond->lock);
2005
2006         if (slaves_support_netpoll(bond_dev))
2007                 bond_dev->priv_flags &= ~IFF_DISABLE_NETPOLL;
2008         read_unlock_bh(&bond->lock);
2009         if (slave_dev->netdev_ops->ndo_netpoll_cleanup)
2010                 slave_dev->netdev_ops->ndo_netpoll_cleanup(slave_dev);
2011         else
2012                 slave_dev->npinfo = NULL;
2013 #endif
2014
2015         /* close slave before restoring its mac address */
2016         dev_close(slave_dev);
2017
2018         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2019                 /* restore original ("permanent") mac address */
2020                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2021                 addr.sa_family = slave_dev->type;
2022                 dev_set_mac_address(slave_dev, &addr);
2023         }
2024
2025         dev_set_mtu(slave_dev, slave->original_mtu);
2026
2027         slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2028                                    IFF_SLAVE_INACTIVE | IFF_BONDING |
2029                                    IFF_SLAVE_NEEDARP);
2030
2031         kfree(slave);
2032
2033         return 0;  /* deletion OK */
2034 }
2035
2036 /*
2037 * First release a slave and than destroy the bond if no more slaves are left.
2038 * Must be under rtnl_lock when this function is called.
2039 */
2040 static int  bond_release_and_destroy(struct net_device *bond_dev,
2041                                      struct net_device *slave_dev)
2042 {
2043         struct bonding *bond = netdev_priv(bond_dev);
2044         int ret;
2045
2046         ret = bond_release(bond_dev, slave_dev);
2047         if ((ret == 0) && (bond->slave_cnt == 0)) {
2048                 pr_info("%s: destroying bond %s.\n",
2049                         bond_dev->name, bond_dev->name);
2050                 unregister_netdevice(bond_dev);
2051         }
2052         return ret;
2053 }
2054
2055 /*
2056  * This function releases all slaves.
2057  */
2058 static int bond_release_all(struct net_device *bond_dev)
2059 {
2060         struct bonding *bond = netdev_priv(bond_dev);
2061         struct slave *slave;
2062         struct net_device *slave_dev;
2063         struct sockaddr addr;
2064
2065         write_lock_bh(&bond->lock);
2066
2067         netif_carrier_off(bond_dev);
2068
2069         if (bond->slave_cnt == 0)
2070                 goto out;
2071
2072         bond->current_arp_slave = NULL;
2073         bond->primary_slave = NULL;
2074         bond_change_active_slave(bond, NULL);
2075
2076         while ((slave = bond->first_slave) != NULL) {
2077                 /* Inform AD package of unbinding of slave
2078                  * before slave is detached from the list.
2079                  */
2080                 if (bond->params.mode == BOND_MODE_8023AD)
2081                         bond_3ad_unbind_slave(slave);
2082
2083                 slave_dev = slave->dev;
2084                 bond_detach_slave(bond, slave);
2085
2086                 /* now that the slave is detached, unlock and perform
2087                  * all the undo steps that should not be called from
2088                  * within a lock.
2089                  */
2090                 write_unlock_bh(&bond->lock);
2091
2092                 if (bond_is_lb(bond)) {
2093                         /* must be called only after the slave
2094                          * has been detached from the list
2095                          */
2096                         bond_alb_deinit_slave(bond, slave);
2097                 }
2098
2099                 bond_compute_features(bond);
2100
2101                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2102                 bond_del_vlans_from_slave(bond, slave_dev);
2103
2104                 /* If the mode USES_PRIMARY, then we should only remove its
2105                  * promisc and mc settings if it was the curr_active_slave, but that was
2106                  * already taken care of above when we detached the slave
2107                  */
2108                 if (!USES_PRIMARY(bond->params.mode)) {
2109                         /* unset promiscuity level from slave */
2110                         if (bond_dev->flags & IFF_PROMISC)
2111                                 dev_set_promiscuity(slave_dev, -1);
2112
2113                         /* unset allmulti level from slave */
2114                         if (bond_dev->flags & IFF_ALLMULTI)
2115                                 dev_set_allmulti(slave_dev, -1);
2116
2117                         /* flush master's mc_list from slave */
2118                         netif_addr_lock_bh(bond_dev);
2119                         bond_mc_list_flush(bond_dev, slave_dev);
2120                         netif_addr_unlock_bh(bond_dev);
2121                 }
2122
2123                 netdev_set_master(slave_dev, NULL);
2124
2125                 /* close slave before restoring its mac address */
2126                 dev_close(slave_dev);
2127
2128                 if (!bond->params.fail_over_mac) {
2129                         /* restore original ("permanent") mac address*/
2130                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2131                         addr.sa_family = slave_dev->type;
2132                         dev_set_mac_address(slave_dev, &addr);
2133                 }
2134
2135                 slave_dev->priv_flags &= ~(IFF_MASTER_8023AD | IFF_MASTER_ALB |
2136                                            IFF_SLAVE_INACTIVE);
2137
2138                 kfree(slave);
2139
2140                 /* re-acquire the lock before getting the next slave */
2141                 write_lock_bh(&bond->lock);
2142         }
2143
2144         /* zero the mac address of the master so it will be
2145          * set by the application to the mac address of the
2146          * first slave
2147          */
2148         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2149
2150         if (!bond->vlgrp) {
2151                 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2152         } else {
2153                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2154                            bond_dev->name, bond_dev->name);
2155                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2156                            bond_dev->name);
2157         }
2158
2159         pr_info("%s: released all slaves\n", bond_dev->name);
2160
2161 out:
2162         write_unlock_bh(&bond->lock);
2163         return 0;
2164 }
2165
2166 /*
2167  * This function changes the active slave to slave <slave_dev>.
2168  * It returns -EINVAL in the following cases.
2169  *  - <slave_dev> is not found in the list.
2170  *  - There is not active slave now.
2171  *  - <slave_dev> is already active.
2172  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2173  *  - <slave_dev> is not running.
2174  * In these cases, this function does nothing.
2175  * In the other cases, current_slave pointer is changed and 0 is returned.
2176  */
2177 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2178 {
2179         struct bonding *bond = netdev_priv(bond_dev);
2180         struct slave *old_active = NULL;
2181         struct slave *new_active = NULL;
2182         int res = 0;
2183
2184         if (!USES_PRIMARY(bond->params.mode))
2185                 return -EINVAL;
2186
2187         /* Verify that master_dev is indeed the master of slave_dev */
2188         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2189                 return -EINVAL;
2190
2191         read_lock(&bond->lock);
2192
2193         read_lock(&bond->curr_slave_lock);
2194         old_active = bond->curr_active_slave;
2195         read_unlock(&bond->curr_slave_lock);
2196
2197         new_active = bond_get_slave_by_dev(bond, slave_dev);
2198
2199         /*
2200          * Changing to the current active: do nothing; return success.
2201          */
2202         if (new_active && (new_active == old_active)) {
2203                 read_unlock(&bond->lock);
2204                 return 0;
2205         }
2206
2207         if ((new_active) &&
2208             (old_active) &&
2209             (new_active->link == BOND_LINK_UP) &&
2210             IS_UP(new_active->dev)) {
2211                 block_netpoll_tx();
2212                 write_lock_bh(&bond->curr_slave_lock);
2213                 bond_change_active_slave(bond, new_active);
2214                 write_unlock_bh(&bond->curr_slave_lock);
2215                 unblock_netpoll_tx();
2216         } else
2217                 res = -EINVAL;
2218
2219         read_unlock(&bond->lock);
2220
2221         return res;
2222 }
2223
2224 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2225 {
2226         struct bonding *bond = netdev_priv(bond_dev);
2227
2228         info->bond_mode = bond->params.mode;
2229         info->miimon = bond->params.miimon;
2230
2231         read_lock(&bond->lock);
2232         info->num_slaves = bond->slave_cnt;
2233         read_unlock(&bond->lock);
2234
2235         return 0;
2236 }
2237
2238 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2239 {
2240         struct bonding *bond = netdev_priv(bond_dev);
2241         struct slave *slave;
2242         int i, res = -ENODEV;
2243
2244         read_lock(&bond->lock);
2245
2246         bond_for_each_slave(bond, slave, i) {
2247                 if (i == (int)info->slave_id) {
2248                         res = 0;
2249                         strcpy(info->slave_name, slave->dev->name);
2250                         info->link = slave->link;
2251                         info->state = slave->state;
2252                         info->link_failure_count = slave->link_failure_count;
2253                         break;
2254                 }
2255         }
2256
2257         read_unlock(&bond->lock);
2258
2259         return res;
2260 }
2261
2262 /*-------------------------------- Monitoring -------------------------------*/
2263
2264
2265 static int bond_miimon_inspect(struct bonding *bond)
2266 {
2267         struct slave *slave;
2268         int i, link_state, commit = 0;
2269         bool ignore_updelay;
2270
2271         ignore_updelay = !bond->curr_active_slave ? true : false;
2272
2273         bond_for_each_slave(bond, slave, i) {
2274                 slave->new_link = BOND_LINK_NOCHANGE;
2275
2276                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2277
2278                 switch (slave->link) {
2279                 case BOND_LINK_UP:
2280                         if (link_state)
2281                                 continue;
2282
2283                         slave->link = BOND_LINK_FAIL;
2284                         slave->delay = bond->params.downdelay;
2285                         if (slave->delay) {
2286                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2287                                         bond->dev->name,
2288                                         (bond->params.mode ==
2289                                          BOND_MODE_ACTIVEBACKUP) ?
2290                                         ((slave->state == BOND_STATE_ACTIVE) ?
2291                                          "active " : "backup ") : "",
2292                                         slave->dev->name,
2293                                         bond->params.downdelay * bond->params.miimon);
2294                         }
2295                         /*FALLTHRU*/
2296                 case BOND_LINK_FAIL:
2297                         if (link_state) {
2298                                 /*
2299                                  * recovered before downdelay expired
2300                                  */
2301                                 slave->link = BOND_LINK_UP;
2302                                 slave->jiffies = jiffies;
2303                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2304                                         bond->dev->name,
2305                                         (bond->params.downdelay - slave->delay) *
2306                                         bond->params.miimon,
2307                                         slave->dev->name);
2308                                 continue;
2309                         }
2310
2311                         if (slave->delay <= 0) {
2312                                 slave->new_link = BOND_LINK_DOWN;
2313                                 commit++;
2314                                 continue;
2315                         }
2316
2317                         slave->delay--;
2318                         break;
2319
2320                 case BOND_LINK_DOWN:
2321                         if (!link_state)
2322                                 continue;
2323
2324                         slave->link = BOND_LINK_BACK;
2325                         slave->delay = bond->params.updelay;
2326
2327                         if (slave->delay) {
2328                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2329                                         bond->dev->name, slave->dev->name,
2330                                         ignore_updelay ? 0 :
2331                                         bond->params.updelay *
2332                                         bond->params.miimon);
2333                         }
2334                         /*FALLTHRU*/
2335                 case BOND_LINK_BACK:
2336                         if (!link_state) {
2337                                 slave->link = BOND_LINK_DOWN;
2338                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2339                                         bond->dev->name,
2340                                         (bond->params.updelay - slave->delay) *
2341                                         bond->params.miimon,
2342                                         slave->dev->name);
2343
2344                                 continue;
2345                         }
2346
2347                         if (ignore_updelay)
2348                                 slave->delay = 0;
2349
2350                         if (slave->delay <= 0) {
2351                                 slave->new_link = BOND_LINK_UP;
2352                                 commit++;
2353                                 ignore_updelay = false;
2354                                 continue;
2355                         }
2356
2357                         slave->delay--;
2358                         break;
2359                 }
2360         }
2361
2362         return commit;
2363 }
2364
2365 static void bond_miimon_commit(struct bonding *bond)
2366 {
2367         struct slave *slave;
2368         int i;
2369
2370         bond_for_each_slave(bond, slave, i) {
2371                 switch (slave->new_link) {
2372                 case BOND_LINK_NOCHANGE:
2373                         continue;
2374
2375                 case BOND_LINK_UP:
2376                         slave->link = BOND_LINK_UP;
2377                         slave->jiffies = jiffies;
2378
2379                         if (bond->params.mode == BOND_MODE_8023AD) {
2380                                 /* prevent it from being the active one */
2381                                 slave->state = BOND_STATE_BACKUP;
2382                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2383                                 /* make it immediately active */
2384                                 slave->state = BOND_STATE_ACTIVE;
2385                         } else if (slave != bond->primary_slave) {
2386                                 /* prevent it from being the active one */
2387                                 slave->state = BOND_STATE_BACKUP;
2388                         }
2389
2390                         bond_update_speed_duplex(slave);
2391
2392                         pr_info("%s: link status definitely up for interface %s, %d Mbps %s duplex.\n",
2393                                 bond->dev->name, slave->dev->name,
2394                                 slave->speed, slave->duplex ? "full" : "half");
2395
2396                         /* notify ad that the link status has changed */
2397                         if (bond->params.mode == BOND_MODE_8023AD)
2398                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2399
2400                         if (bond_is_lb(bond))
2401                                 bond_alb_handle_link_change(bond, slave,
2402                                                             BOND_LINK_UP);
2403
2404                         if (!bond->curr_active_slave ||
2405                             (slave == bond->primary_slave))
2406                                 goto do_failover;
2407
2408                         continue;
2409
2410                 case BOND_LINK_DOWN:
2411                         if (slave->link_failure_count < UINT_MAX)
2412                                 slave->link_failure_count++;
2413
2414                         slave->link = BOND_LINK_DOWN;
2415
2416                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2417                             bond->params.mode == BOND_MODE_8023AD)
2418                                 bond_set_slave_inactive_flags(slave);
2419
2420                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2421                                 bond->dev->name, slave->dev->name);
2422
2423                         if (bond->params.mode == BOND_MODE_8023AD)
2424                                 bond_3ad_handle_link_change(slave,
2425                                                             BOND_LINK_DOWN);
2426
2427                         if (bond_is_lb(bond))
2428                                 bond_alb_handle_link_change(bond, slave,
2429                                                             BOND_LINK_DOWN);
2430
2431                         if (slave == bond->curr_active_slave)
2432                                 goto do_failover;
2433
2434                         continue;
2435
2436                 default:
2437                         pr_err("%s: invalid new link %d on slave %s\n",
2438                                bond->dev->name, slave->new_link,
2439                                slave->dev->name);
2440                         slave->new_link = BOND_LINK_NOCHANGE;
2441
2442                         continue;
2443                 }
2444
2445 do_failover:
2446                 ASSERT_RTNL();
2447                 block_netpoll_tx();
2448                 write_lock_bh(&bond->curr_slave_lock);
2449                 bond_select_active_slave(bond);
2450                 write_unlock_bh(&bond->curr_slave_lock);
2451                 unblock_netpoll_tx();
2452         }
2453
2454         bond_set_carrier(bond);
2455 }
2456
2457 /*
2458  * bond_mii_monitor
2459  *
2460  * Really a wrapper that splits the mii monitor into two phases: an
2461  * inspection, then (if inspection indicates something needs to be done)
2462  * an acquisition of appropriate locks followed by a commit phase to
2463  * implement whatever link state changes are indicated.
2464  */
2465 void bond_mii_monitor(struct work_struct *work)
2466 {
2467         struct bonding *bond = container_of(work, struct bonding,
2468                                             mii_work.work);
2469
2470         read_lock(&bond->lock);
2471         if (bond->kill_timers)
2472                 goto out;
2473
2474         if (bond->slave_cnt == 0)
2475                 goto re_arm;
2476
2477         if (bond->send_grat_arp) {
2478                 read_lock(&bond->curr_slave_lock);
2479                 bond_send_gratuitous_arp(bond);
2480                 read_unlock(&bond->curr_slave_lock);
2481         }
2482
2483         if (bond->send_unsol_na) {
2484                 read_lock(&bond->curr_slave_lock);
2485                 bond_send_unsolicited_na(bond);
2486                 read_unlock(&bond->curr_slave_lock);
2487         }
2488
2489         if (bond_miimon_inspect(bond)) {
2490                 read_unlock(&bond->lock);
2491                 rtnl_lock();
2492                 read_lock(&bond->lock);
2493
2494                 bond_miimon_commit(bond);
2495
2496                 read_unlock(&bond->lock);
2497                 rtnl_unlock();  /* might sleep, hold no other locks */
2498                 read_lock(&bond->lock);
2499         }
2500
2501 re_arm:
2502         if (bond->params.miimon)
2503                 queue_delayed_work(bond->wq, &bond->mii_work,
2504                                    msecs_to_jiffies(bond->params.miimon));
2505 out:
2506         read_unlock(&bond->lock);
2507 }
2508
2509 static __be32 bond_glean_dev_ip(struct net_device *dev)
2510 {
2511         struct in_device *idev;
2512         struct in_ifaddr *ifa;
2513         __be32 addr = 0;
2514
2515         if (!dev)
2516                 return 0;
2517
2518         rcu_read_lock();
2519         idev = __in_dev_get_rcu(dev);
2520         if (!idev)
2521                 goto out;
2522
2523         ifa = idev->ifa_list;
2524         if (!ifa)
2525                 goto out;
2526
2527         addr = ifa->ifa_local;
2528 out:
2529         rcu_read_unlock();
2530         return addr;
2531 }
2532
2533 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2534 {
2535         struct vlan_entry *vlan;
2536
2537         if (ip == bond->master_ip)
2538                 return 1;
2539
2540         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2541                 if (ip == vlan->vlan_ip)
2542                         return 1;
2543         }
2544
2545         return 0;
2546 }
2547
2548 /*
2549  * We go to the (large) trouble of VLAN tagging ARP frames because
2550  * switches in VLAN mode (especially if ports are configured as
2551  * "native" to a VLAN) might not pass non-tagged frames.
2552  */
2553 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2554 {
2555         struct sk_buff *skb;
2556
2557         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2558                  slave_dev->name, dest_ip, src_ip, vlan_id);
2559
2560         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2561                          NULL, slave_dev->dev_addr, NULL);
2562
2563         if (!skb) {
2564                 pr_err("ARP packet allocation failed\n");
2565                 return;
2566         }
2567         if (vlan_id) {
2568                 skb = vlan_put_tag(skb, vlan_id);
2569                 if (!skb) {
2570                         pr_err("failed to insert VLAN tag\n");
2571                         return;
2572                 }
2573         }
2574         arp_xmit(skb);
2575 }
2576
2577
2578 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2579 {
2580         int i, vlan_id, rv;
2581         __be32 *targets = bond->params.arp_targets;
2582         struct vlan_entry *vlan;
2583         struct net_device *vlan_dev;
2584         struct flowi fl;
2585         struct rtable *rt;
2586
2587         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2588                 if (!targets[i])
2589                         break;
2590                 pr_debug("basa: target %x\n", targets[i]);
2591                 if (!bond->vlgrp) {
2592                         pr_debug("basa: empty vlan: arp_send\n");
2593                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2594                                       bond->master_ip, 0);
2595                         continue;
2596                 }
2597
2598                 /*
2599                  * If VLANs are configured, we do a route lookup to
2600                  * determine which VLAN interface would be used, so we
2601                  * can tag the ARP with the proper VLAN tag.
2602                  */
2603                 memset(&fl, 0, sizeof(fl));
2604                 fl.fl4_dst = targets[i];
2605                 fl.fl4_tos = RTO_ONLINK;
2606
2607                 rv = ip_route_output_key(dev_net(bond->dev), &rt, &fl);
2608                 if (rv) {
2609                         if (net_ratelimit()) {
2610                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2611                                            bond->dev->name, &fl.fl4_dst);
2612                         }
2613                         continue;
2614                 }
2615
2616                 /*
2617                  * This target is not on a VLAN
2618                  */
2619                 if (rt->dst.dev == bond->dev) {
2620                         ip_rt_put(rt);
2621                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2622                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2623                                       bond->master_ip, 0);
2624                         continue;
2625                 }
2626
2627                 vlan_id = 0;
2628                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2629                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2630                         if (vlan_dev == rt->dst.dev) {
2631                                 vlan_id = vlan->vlan_id;
2632                                 pr_debug("basa: vlan match on %s %d\n",
2633                                        vlan_dev->name, vlan_id);
2634                                 break;
2635                         }
2636                 }
2637
2638                 if (vlan_id) {
2639                         ip_rt_put(rt);
2640                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2641                                       vlan->vlan_ip, vlan_id);
2642                         continue;
2643                 }
2644
2645                 if (net_ratelimit()) {
2646                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2647                                    bond->dev->name, &fl.fl4_dst,
2648                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2649                 }
2650                 ip_rt_put(rt);
2651         }
2652 }
2653
2654 /*
2655  * Kick out a gratuitous ARP for an IP on the bonding master plus one
2656  * for each VLAN above us.
2657  *
2658  * Caller must hold curr_slave_lock for read or better
2659  */
2660 static void bond_send_gratuitous_arp(struct bonding *bond)
2661 {
2662         struct slave *slave = bond->curr_active_slave;
2663         struct vlan_entry *vlan;
2664         struct net_device *vlan_dev;
2665
2666         pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2667                  bond->dev->name, slave ? slave->dev->name : "NULL");
2668
2669         if (!slave || !bond->send_grat_arp ||
2670             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2671                 return;
2672
2673         bond->send_grat_arp--;
2674
2675         if (bond->master_ip) {
2676                 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2677                                 bond->master_ip, 0);
2678         }
2679
2680         if (!bond->vlgrp)
2681                 return;
2682
2683         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2684                 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2685                 if (vlan->vlan_ip) {
2686                         bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2687                                       vlan->vlan_ip, vlan->vlan_id);
2688                 }
2689         }
2690 }
2691
2692 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2693 {
2694         int i;
2695         __be32 *targets = bond->params.arp_targets;
2696
2697         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2698                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2699                          &sip, &tip, i, &targets[i],
2700                          bond_has_this_ip(bond, tip));
2701                 if (sip == targets[i]) {
2702                         if (bond_has_this_ip(bond, tip))
2703                                 slave->last_arp_rx = jiffies;
2704                         return;
2705                 }
2706         }
2707 }
2708
2709 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2710 {
2711         struct arphdr *arp;
2712         struct slave *slave;
2713         struct bonding *bond;
2714         unsigned char *arp_ptr;
2715         __be32 sip, tip;
2716
2717         if (dev->priv_flags & IFF_802_1Q_VLAN) {
2718                 /*
2719                  * When using VLANS and bonding, dev and oriv_dev may be
2720                  * incorrect if the physical interface supports VLAN
2721                  * acceleration.  With this change ARP validation now
2722                  * works for hosts only reachable on the VLAN interface.
2723                  */
2724                 dev = vlan_dev_real_dev(dev);
2725                 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2726         }
2727
2728         if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2729                 goto out;
2730
2731         bond = netdev_priv(dev);
2732         read_lock(&bond->lock);
2733
2734         pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2735                  bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2736                  orig_dev ? orig_dev->name : "NULL");
2737
2738         slave = bond_get_slave_by_dev(bond, orig_dev);
2739         if (!slave || !slave_do_arp_validate(bond, slave))
2740                 goto out_unlock;
2741
2742         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2743                 goto out_unlock;
2744
2745         arp = arp_hdr(skb);
2746         if (arp->ar_hln != dev->addr_len ||
2747             skb->pkt_type == PACKET_OTHERHOST ||
2748             skb->pkt_type == PACKET_LOOPBACK ||
2749             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2750             arp->ar_pro != htons(ETH_P_IP) ||
2751             arp->ar_pln != 4)
2752                 goto out_unlock;
2753
2754         arp_ptr = (unsigned char *)(arp + 1);
2755         arp_ptr += dev->addr_len;
2756         memcpy(&sip, arp_ptr, 4);
2757         arp_ptr += 4 + dev->addr_len;
2758         memcpy(&tip, arp_ptr, 4);
2759
2760         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2761                  bond->dev->name, slave->dev->name, slave->state,
2762                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2763                  &sip, &tip);
2764
2765         /*
2766          * Backup slaves won't see the ARP reply, but do come through
2767          * here for each ARP probe (so we swap the sip/tip to validate
2768          * the probe).  In a "redundant switch, common router" type of
2769          * configuration, the ARP probe will (hopefully) travel from
2770          * the active, through one switch, the router, then the other
2771          * switch before reaching the backup.
2772          */
2773         if (slave->state == BOND_STATE_ACTIVE)
2774                 bond_validate_arp(bond, slave, sip, tip);
2775         else
2776                 bond_validate_arp(bond, slave, tip, sip);
2777
2778 out_unlock:
2779         read_unlock(&bond->lock);
2780 out:
2781         dev_kfree_skb(skb);
2782         return NET_RX_SUCCESS;
2783 }
2784
2785 /*
2786  * this function is called regularly to monitor each slave's link
2787  * ensuring that traffic is being sent and received when arp monitoring
2788  * is used in load-balancing mode. if the adapter has been dormant, then an
2789  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2790  * arp monitoring in active backup mode.
2791  */
2792 void bond_loadbalance_arp_mon(struct work_struct *work)
2793 {
2794         struct bonding *bond = container_of(work, struct bonding,
2795                                             arp_work.work);
2796         struct slave *slave, *oldcurrent;
2797         int do_failover = 0;
2798         int delta_in_ticks;
2799         int i;
2800
2801         read_lock(&bond->lock);
2802
2803         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2804
2805         if (bond->kill_timers)
2806                 goto out;
2807
2808         if (bond->slave_cnt == 0)
2809                 goto re_arm;
2810
2811         read_lock(&bond->curr_slave_lock);
2812         oldcurrent = bond->curr_active_slave;
2813         read_unlock(&bond->curr_slave_lock);
2814
2815         /* see if any of the previous devices are up now (i.e. they have
2816          * xmt and rcv traffic). the curr_active_slave does not come into
2817          * the picture unless it is null. also, slave->jiffies is not needed
2818          * here because we send an arp on each slave and give a slave as
2819          * long as it needs to get the tx/rx within the delta.
2820          * TODO: what about up/down delay in arp mode? it wasn't here before
2821          *       so it can wait
2822          */
2823         bond_for_each_slave(bond, slave, i) {
2824                 unsigned long trans_start = dev_trans_start(slave->dev);
2825
2826                 if (slave->link != BOND_LINK_UP) {
2827                         if (time_in_range(jiffies,
2828                                 trans_start - delta_in_ticks,
2829                                 trans_start + delta_in_ticks) &&
2830                             time_in_range(jiffies,
2831                                 slave->dev->last_rx - delta_in_ticks,
2832                                 slave->dev->last_rx + delta_in_ticks)) {
2833
2834                                 slave->link  = BOND_LINK_UP;
2835                                 slave->state = BOND_STATE_ACTIVE;
2836
2837                                 /* primary_slave has no meaning in round-robin
2838                                  * mode. the window of a slave being up and
2839                                  * curr_active_slave being null after enslaving
2840                                  * is closed.
2841                                  */
2842                                 if (!oldcurrent) {
2843                                         pr_info("%s: link status definitely up for interface %s, ",
2844                                                 bond->dev->name,
2845                                                 slave->dev->name);
2846                                         do_failover = 1;
2847                                 } else {
2848                                         pr_info("%s: interface %s is now up\n",
2849                                                 bond->dev->name,
2850                                                 slave->dev->name);
2851                                 }
2852                         }
2853                 } else {
2854                         /* slave->link == BOND_LINK_UP */
2855
2856                         /* not all switches will respond to an arp request
2857                          * when the source ip is 0, so don't take the link down
2858                          * if we don't know our ip yet
2859                          */
2860                         if (!time_in_range(jiffies,
2861                                 trans_start - delta_in_ticks,
2862                                 trans_start + 2 * delta_in_ticks) ||
2863                             !time_in_range(jiffies,
2864                                 slave->dev->last_rx - delta_in_ticks,
2865                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2866
2867                                 slave->link  = BOND_LINK_DOWN;
2868                                 slave->state = BOND_STATE_BACKUP;
2869
2870                                 if (slave->link_failure_count < UINT_MAX)
2871                                         slave->link_failure_count++;
2872
2873                                 pr_info("%s: interface %s is now down.\n",
2874                                         bond->dev->name,
2875                                         slave->dev->name);
2876
2877                                 if (slave == oldcurrent)
2878                                         do_failover = 1;
2879                         }
2880                 }
2881
2882                 /* note: if switch is in round-robin mode, all links
2883                  * must tx arp to ensure all links rx an arp - otherwise
2884                  * links may oscillate or not come up at all; if switch is
2885                  * in something like xor mode, there is nothing we can
2886                  * do - all replies will be rx'ed on same link causing slaves
2887                  * to be unstable during low/no traffic periods
2888                  */
2889                 if (IS_UP(slave->dev))
2890                         bond_arp_send_all(bond, slave);
2891         }
2892
2893         if (do_failover) {
2894                 block_netpoll_tx();
2895                 write_lock_bh(&bond->curr_slave_lock);
2896
2897                 bond_select_active_slave(bond);
2898
2899                 write_unlock_bh(&bond->curr_slave_lock);
2900                 unblock_netpoll_tx();
2901         }
2902
2903 re_arm:
2904         if (bond->params.arp_interval)
2905                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2906 out:
2907         read_unlock(&bond->lock);
2908 }
2909
2910 /*
2911  * Called to inspect slaves for active-backup mode ARP monitor link state
2912  * changes.  Sets new_link in slaves to specify what action should take
2913  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2914  * to link states must be committed.
2915  *
2916  * Called with bond->lock held for read.
2917  */
2918 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2919 {
2920         struct slave *slave;
2921         int i, commit = 0;
2922         unsigned long trans_start;
2923
2924         bond_for_each_slave(bond, slave, i) {
2925                 slave->new_link = BOND_LINK_NOCHANGE;
2926
2927                 if (slave->link != BOND_LINK_UP) {
2928                         if (time_in_range(jiffies,
2929                                 slave_last_rx(bond, slave) - delta_in_ticks,
2930                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2931
2932                                 slave->new_link = BOND_LINK_UP;
2933                                 commit++;
2934                         }
2935
2936                         continue;
2937                 }
2938
2939                 /*
2940                  * Give slaves 2*delta after being enslaved or made
2941                  * active.  This avoids bouncing, as the last receive
2942                  * times need a full ARP monitor cycle to be updated.
2943                  */
2944                 if (time_in_range(jiffies,
2945                                   slave->jiffies - delta_in_ticks,
2946                                   slave->jiffies + 2 * delta_in_ticks))
2947                         continue;
2948
2949                 /*
2950                  * Backup slave is down if:
2951                  * - No current_arp_slave AND
2952                  * - more than 3*delta since last receive AND
2953                  * - the bond has an IP address
2954                  *
2955                  * Note: a non-null current_arp_slave indicates
2956                  * the curr_active_slave went down and we are
2957                  * searching for a new one; under this condition
2958                  * we only take the curr_active_slave down - this
2959                  * gives each slave a chance to tx/rx traffic
2960                  * before being taken out
2961                  */
2962                 if (slave->state == BOND_STATE_BACKUP &&
2963                     !bond->current_arp_slave &&
2964                     !time_in_range(jiffies,
2965                         slave_last_rx(bond, slave) - delta_in_ticks,
2966                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2967
2968                         slave->new_link = BOND_LINK_DOWN;
2969                         commit++;
2970                 }
2971
2972                 /*
2973                  * Active slave is down if:
2974                  * - more than 2*delta since transmitting OR
2975                  * - (more than 2*delta since receive AND
2976                  *    the bond has an IP address)
2977                  */
2978                 trans_start = dev_trans_start(slave->dev);
2979                 if ((slave->state == BOND_STATE_ACTIVE) &&
2980                     (!time_in_range(jiffies,
2981                         trans_start - delta_in_ticks,
2982                         trans_start + 2 * delta_in_ticks) ||
2983                      !time_in_range(jiffies,
2984                         slave_last_rx(bond, slave) - delta_in_ticks,
2985                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2986
2987                         slave->new_link = BOND_LINK_DOWN;
2988                         commit++;
2989                 }
2990         }
2991
2992         return commit;
2993 }
2994
2995 /*
2996  * Called to commit link state changes noted by inspection step of
2997  * active-backup mode ARP monitor.
2998  *
2999  * Called with RTNL and bond->lock for read.
3000  */
3001 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3002 {
3003         struct slave *slave;
3004         int i;
3005         unsigned long trans_start;
3006
3007         bond_for_each_slave(bond, slave, i) {
3008                 switch (slave->new_link) {
3009                 case BOND_LINK_NOCHANGE:
3010                         continue;
3011
3012                 case BOND_LINK_UP:
3013                         trans_start = dev_trans_start(slave->dev);
3014                         if ((!bond->curr_active_slave &&
3015                              time_in_range(jiffies,
3016                                            trans_start - delta_in_ticks,
3017                                            trans_start + delta_in_ticks)) ||
3018                             bond->curr_active_slave != slave) {
3019                                 slave->link = BOND_LINK_UP;
3020                                 bond->current_arp_slave = NULL;
3021
3022                                 pr_info("%s: link status definitely up for interface %s.\n",
3023                                         bond->dev->name, slave->dev->name);
3024
3025                                 if (!bond->curr_active_slave ||
3026                                     (slave == bond->primary_slave))
3027                                         goto do_failover;
3028
3029                         }
3030
3031                         continue;
3032
3033                 case BOND_LINK_DOWN:
3034                         if (slave->link_failure_count < UINT_MAX)
3035                                 slave->link_failure_count++;
3036
3037                         slave->link = BOND_LINK_DOWN;
3038                         bond_set_slave_inactive_flags(slave);
3039
3040                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
3041                                 bond->dev->name, slave->dev->name);
3042
3043                         if (slave == bond->curr_active_slave) {
3044                                 bond->current_arp_slave = NULL;
3045                                 goto do_failover;
3046                         }
3047
3048                         continue;
3049
3050                 default:
3051                         pr_err("%s: impossible: new_link %d on slave %s\n",
3052                                bond->dev->name, slave->new_link,
3053                                slave->dev->name);
3054                         continue;
3055                 }
3056
3057 do_failover:
3058                 ASSERT_RTNL();
3059                 block_netpoll_tx();
3060                 write_lock_bh(&bond->curr_slave_lock);
3061                 bond_select_active_slave(bond);
3062                 write_unlock_bh(&bond->curr_slave_lock);
3063                 unblock_netpoll_tx();
3064         }
3065
3066         bond_set_carrier(bond);
3067 }
3068
3069 /*
3070  * Send ARP probes for active-backup mode ARP monitor.
3071  *
3072  * Called with bond->lock held for read.
3073  */
3074 static void bond_ab_arp_probe(struct bonding *bond)
3075 {
3076         struct slave *slave;
3077         int i;
3078
3079         read_lock(&bond->curr_slave_lock);
3080
3081         if (bond->current_arp_slave && bond->curr_active_slave)
3082                 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3083                         bond->current_arp_slave->dev->name,
3084                         bond->curr_active_slave->dev->name);
3085
3086         if (bond->curr_active_slave) {
3087                 bond_arp_send_all(bond, bond->curr_active_slave);
3088                 read_unlock(&bond->curr_slave_lock);
3089                 return;
3090         }
3091
3092         read_unlock(&bond->curr_slave_lock);
3093
3094         /* if we don't have a curr_active_slave, search for the next available
3095          * backup slave from the current_arp_slave and make it the candidate
3096          * for becoming the curr_active_slave
3097          */
3098
3099         if (!bond->current_arp_slave) {
3100                 bond->current_arp_slave = bond->first_slave;
3101                 if (!bond->current_arp_slave)
3102                         return;
3103         }
3104
3105         bond_set_slave_inactive_flags(bond->current_arp_slave);
3106
3107         /* search for next candidate */
3108         bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3109                 if (IS_UP(slave->dev)) {
3110                         slave->link = BOND_LINK_BACK;
3111                         bond_set_slave_active_flags(slave);
3112                         bond_arp_send_all(bond, slave);
3113                         slave->jiffies = jiffies;
3114                         bond->current_arp_slave = slave;
3115                         break;
3116                 }
3117
3118                 /* if the link state is up at this point, we
3119                  * mark it down - this can happen if we have
3120                  * simultaneous link failures and
3121                  * reselect_active_interface doesn't make this
3122                  * one the current slave so it is still marked
3123                  * up when it is actually down
3124                  */
3125                 if (slave->link == BOND_LINK_UP) {
3126                         slave->link = BOND_LINK_DOWN;
3127                         if (slave->link_failure_count < UINT_MAX)
3128                                 slave->link_failure_count++;
3129
3130                         bond_set_slave_inactive_flags(slave);
3131
3132                         pr_info("%s: backup interface %s is now down.\n",
3133                                 bond->dev->name, slave->dev->name);
3134                 }
3135         }
3136 }
3137
3138 void bond_activebackup_arp_mon(struct work_struct *work)
3139 {
3140         struct bonding *bond = container_of(work, struct bonding,
3141                                             arp_work.work);
3142         int delta_in_ticks;
3143
3144         read_lock(&bond->lock);
3145
3146         if (bond->kill_timers)
3147                 goto out;
3148
3149         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3150
3151         if (bond->slave_cnt == 0)
3152                 goto re_arm;
3153
3154         if (bond->send_grat_arp) {
3155                 read_lock(&bond->curr_slave_lock);
3156                 bond_send_gratuitous_arp(bond);
3157                 read_unlock(&bond->curr_slave_lock);
3158         }
3159
3160         if (bond->send_unsol_na) {
3161                 read_lock(&bond->curr_slave_lock);
3162                 bond_send_unsolicited_na(bond);
3163                 read_unlock(&bond->curr_slave_lock);
3164         }
3165
3166         if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3167                 read_unlock(&bond->lock);
3168                 rtnl_lock();
3169                 read_lock(&bond->lock);
3170
3171                 bond_ab_arp_commit(bond, delta_in_ticks);
3172
3173                 read_unlock(&bond->lock);
3174                 rtnl_unlock();
3175                 read_lock(&bond->lock);
3176         }
3177
3178         bond_ab_arp_probe(bond);
3179
3180 re_arm:
3181         if (bond->params.arp_interval)
3182                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3183 out:
3184         read_unlock(&bond->lock);
3185 }
3186
3187 /*------------------------------ proc/seq_file-------------------------------*/
3188
3189 #ifdef CONFIG_PROC_FS
3190
3191 static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
3192         __acquires(&dev_base_lock)
3193         __acquires(&bond->lock)
3194 {
3195         struct bonding *bond = seq->private;
3196         loff_t off = 0;
3197         struct slave *slave;
3198         int i;
3199
3200         /* make sure the bond won't be taken away */
3201         read_lock(&dev_base_lock);
3202         read_lock(&bond->lock);
3203
3204         if (*pos == 0)
3205                 return SEQ_START_TOKEN;
3206
3207         bond_for_each_slave(bond, slave, i) {
3208                 if (++off == *pos)
3209                         return slave;
3210         }
3211
3212         return NULL;
3213 }
3214
3215 static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3216 {
3217         struct bonding *bond = seq->private;
3218         struct slave *slave = v;
3219
3220         ++*pos;
3221         if (v == SEQ_START_TOKEN)
3222                 return bond->first_slave;
3223
3224         slave = slave->next;
3225
3226         return (slave == bond->first_slave) ? NULL : slave;
3227 }
3228
3229 static void bond_info_seq_stop(struct seq_file *seq, void *v)
3230         __releases(&bond->lock)
3231         __releases(&dev_base_lock)
3232 {
3233         struct bonding *bond = seq->private;
3234
3235         read_unlock(&bond->lock);
3236         read_unlock(&dev_base_lock);
3237 }
3238
3239 static void bond_info_show_master(struct seq_file *seq)
3240 {
3241         struct bonding *bond = seq->private;
3242         struct slave *curr;
3243         int i;
3244
3245         read_lock(&bond->curr_slave_lock);
3246         curr = bond->curr_active_slave;
3247         read_unlock(&bond->curr_slave_lock);
3248
3249         seq_printf(seq, "Bonding Mode: %s",
3250                    bond_mode_name(bond->params.mode));
3251
3252         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
3253             bond->params.fail_over_mac)
3254                 seq_printf(seq, " (fail_over_mac %s)",
3255                    fail_over_mac_tbl[bond->params.fail_over_mac].modename);
3256
3257         seq_printf(seq, "\n");
3258
3259         if (bond->params.mode == BOND_MODE_XOR ||
3260                 bond->params.mode == BOND_MODE_8023AD) {
3261                 seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
3262                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
3263                         bond->params.xmit_policy);
3264         }
3265
3266         if (USES_PRIMARY(bond->params.mode)) {
3267                 seq_printf(seq, "Primary Slave: %s",
3268                            (bond->primary_slave) ?
3269                            bond->primary_slave->dev->name : "None");
3270                 if (bond->primary_slave)
3271                         seq_printf(seq, " (primary_reselect %s)",
3272                    pri_reselect_tbl[bond->params.primary_reselect].modename);
3273
3274                 seq_printf(seq, "\nCurrently Active Slave: %s\n",
3275                            (curr) ? curr->dev->name : "None");
3276         }
3277
3278         seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
3279                    "up" : "down");
3280         seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
3281         seq_printf(seq, "Up Delay (ms): %d\n",
3282                    bond->params.updelay * bond->params.miimon);
3283         seq_printf(seq, "Down Delay (ms): %d\n",
3284                    bond->params.downdelay * bond->params.miimon);
3285
3286
3287         /* ARP information */
3288         if (bond->params.arp_interval > 0) {
3289                 int printed = 0;
3290                 seq_printf(seq, "ARP Polling Interval (ms): %d\n",
3291                                 bond->params.arp_interval);
3292
3293                 seq_printf(seq, "ARP IP target/s (n.n.n.n form):");
3294
3295                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
3296                         if (!bond->params.arp_targets[i])
3297                                 break;
3298                         if (printed)
3299                                 seq_printf(seq, ",");
3300                         seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
3301                         printed = 1;
3302                 }
3303                 seq_printf(seq, "\n");
3304         }
3305
3306         if (bond->params.mode == BOND_MODE_8023AD) {
3307                 struct ad_info ad_info;
3308
3309                 seq_puts(seq, "\n802.3ad info\n");
3310                 seq_printf(seq, "LACP rate: %s\n",
3311                            (bond->params.lacp_fast) ? "fast" : "slow");
3312                 seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
3313                            ad_select_tbl[bond->params.ad_select].modename);
3314
3315                 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3316                         seq_printf(seq, "bond %s has no active aggregator\n",
3317                                    bond->dev->name);
3318                 } else {
3319                         seq_printf(seq, "Active Aggregator Info:\n");
3320
3321                         seq_printf(seq, "\tAggregator ID: %d\n",
3322                                    ad_info.aggregator_id);
3323                         seq_printf(seq, "\tNumber of ports: %d\n",
3324                                    ad_info.ports);
3325                         seq_printf(seq, "\tActor Key: %d\n",
3326                                    ad_info.actor_key);
3327                         seq_printf(seq, "\tPartner Key: %d\n",
3328                                    ad_info.partner_key);
3329                         seq_printf(seq, "\tPartner Mac Address: %pM\n",
3330                                    ad_info.partner_system);
3331                 }
3332         }
3333 }
3334
3335 static void bond_info_show_slave(struct seq_file *seq,
3336                                  const struct slave *slave)
3337 {
3338         struct bonding *bond = seq->private;
3339
3340         seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
3341         seq_printf(seq, "MII Status: %s\n",
3342                    (slave->link == BOND_LINK_UP) ?  "up" : "down");
3343         seq_printf(seq, "Speed: %d Mbps\n", slave->speed);
3344         seq_printf(seq, "Duplex: %s\n", slave->duplex ? "full" : "half");
3345         seq_printf(seq, "Link Failure Count: %u\n",
3346                    slave->link_failure_count);
3347
3348         seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);
3349
3350         if (bond->params.mode == BOND_MODE_8023AD) {
3351                 const struct aggregator *agg
3352                         = SLAVE_AD_INFO(slave).port.aggregator;
3353
3354                 if (agg)
3355                         seq_printf(seq, "Aggregator ID: %d\n",
3356                                    agg->aggregator_identifier);
3357                 else
3358                         seq_puts(seq, "Aggregator ID: N/A\n");
3359         }
3360         seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
3361 }
3362
3363 static int bond_info_seq_show(struct seq_file *seq, void *v)
3364 {
3365         if (v == SEQ_START_TOKEN) {
3366                 seq_printf(seq, "%s\n", version);
3367                 bond_info_show_master(seq);
3368         } else
3369                 bond_info_show_slave(seq, v);
3370
3371         return 0;
3372 }
3373
3374 static const struct seq_operations bond_info_seq_ops = {
3375         .start = bond_info_seq_start,
3376         .next  = bond_info_seq_next,
3377         .stop  = bond_info_seq_stop,
3378         .show  = bond_info_seq_show,
3379 };
3380
3381 static int bond_info_open(struct inode *inode, struct file *file)
3382 {
3383         struct seq_file *seq;
3384         struct proc_dir_entry *proc;
3385         int res;
3386
3387         res = seq_open(file, &bond_info_seq_ops);
3388         if (!res) {
3389                 /* recover the pointer buried in proc_dir_entry data */
3390                 seq = file->private_data;
3391                 proc = PDE(inode);
3392                 seq->private = proc->data;
3393         }
3394
3395         return res;
3396 }
3397
3398 static const struct file_operations bond_info_fops = {
3399         .owner   = THIS_MODULE,
3400         .open    = bond_info_open,
3401         .read    = seq_read,
3402         .llseek  = seq_lseek,
3403         .release = seq_release,
3404 };
3405
3406 static void bond_create_proc_entry(struct bonding *bond)
3407 {
3408         struct net_device *bond_dev = bond->dev;
3409         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3410
3411         if (bn->proc_dir) {
3412                 bond->proc_entry = proc_create_data(bond_dev->name,
3413                                                     S_IRUGO, bn->proc_dir,
3414                                                     &bond_info_fops, bond);
3415                 if (bond->proc_entry == NULL)
3416                         pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
3417                                    DRV_NAME, bond_dev->name);
3418                 else
3419                         memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
3420         }
3421 }
3422
3423 static void bond_remove_proc_entry(struct bonding *bond)
3424 {
3425         struct net_device *bond_dev = bond->dev;
3426         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
3427
3428         if (bn->proc_dir && bond->proc_entry) {
3429                 remove_proc_entry(bond->proc_file_name, bn->proc_dir);
3430                 memset(bond->proc_file_name, 0, IFNAMSIZ);
3431                 bond->proc_entry = NULL;
3432         }
3433 }
3434
3435 /* Create the bonding directory under /proc/net, if doesn't exist yet.
3436  * Caller must hold rtnl_lock.
3437  */
3438 static void __net_init bond_create_proc_dir(struct bond_net *bn)
3439 {
3440         if (!bn->proc_dir) {
3441                 bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
3442                 if (!bn->proc_dir)
3443                         pr_warning("Warning: cannot create /proc/net/%s\n",
3444                                    DRV_NAME);
3445         }
3446 }
3447
3448 /* Destroy the bonding directory under /proc/net, if empty.
3449  * Caller must hold rtnl_lock.
3450  */
3451 static void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
3452 {
3453         if (bn->proc_dir) {
3454                 remove_proc_entry(DRV_NAME, bn->net->proc_net);
3455                 bn->proc_dir = NULL;
3456         }
3457 }
3458
3459 #else /* !CONFIG_PROC_FS */
3460
3461 static void bond_create_proc_entry(struct bonding *bond)
3462 {
3463 }
3464
3465 static void bond_remove_proc_entry(struct bonding *bond)
3466 {
3467 }
3468
3469 static inline void bond_create_proc_dir(struct bond_net *bn)
3470 {
3471 }
3472
3473 static inline void bond_destroy_proc_dir(struct bond_net *bn)
3474 {
3475 }
3476
3477 #endif /* CONFIG_PROC_FS */
3478
3479
3480 /*-------------------------- netdev event handling --------------------------*/
3481
3482 /*
3483  * Change device name
3484  */
3485 static int bond_event_changename(struct bonding *bond)
3486 {
3487         bond_remove_proc_entry(bond);
3488         bond_create_proc_entry(bond);
3489
3490         return NOTIFY_DONE;
3491 }
3492
3493 static int bond_master_netdev_event(unsigned long event,
3494                                     struct net_device *bond_dev)
3495 {
3496         struct bonding *event_bond = netdev_priv(bond_dev);
3497
3498         switch (event) {
3499         case NETDEV_CHANGENAME:
3500                 return bond_event_changename(event_bond);
3501         default:
3502                 break;
3503         }
3504
3505         return NOTIFY_DONE;
3506 }
3507
3508 static int bond_slave_netdev_event(unsigned long event,
3509                                    struct net_device *slave_dev)
3510 {
3511         struct net_device *bond_dev = slave_dev->master;
3512         struct bonding *bond = netdev_priv(bond_dev);
3513
3514         switch (event) {
3515         case NETDEV_UNREGISTER:
3516                 if (bond_dev) {
3517                         if (bond->setup_by_slave)
3518                                 bond_release_and_destroy(bond_dev, slave_dev);
3519                         else
3520                                 bond_release(bond_dev, slave_dev);
3521                 }
3522                 break;
3523         case NETDEV_CHANGE:
3524                 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3525                         struct slave *slave;
3526
3527                         slave = bond_get_slave_by_dev(bond, slave_dev);
3528                         if (slave) {
3529                                 u16 old_speed = slave->speed;
3530                                 u16 old_duplex = slave->duplex;
3531
3532                                 bond_update_speed_duplex(slave);
3533
3534                                 if (bond_is_lb(bond))
3535                                         break;
3536
3537                                 if (old_speed != slave->speed)
3538                                         bond_3ad_adapter_speed_changed(slave);
3539                                 if (old_duplex != slave->duplex)
3540                                         bond_3ad_adapter_duplex_changed(slave);
3541                         }
3542                 }
3543
3544                 break;
3545         case NETDEV_DOWN:
3546                 /*
3547                  * ... Or is it this?
3548                  */
3549                 break;
3550         case NETDEV_CHANGEMTU:
3551                 /*
3552                  * TODO: Should slaves be allowed to
3553                  * independently alter their MTU?  For
3554                  * an active-backup bond, slaves need
3555                  * not be the same type of device, so
3556                  * MTUs may vary.  For other modes,
3557                  * slaves arguably should have the
3558                  * same MTUs. To do this, we'd need to
3559                  * take over the slave's change_mtu
3560                  * function for the duration of their
3561                  * servitude.
3562                  */
3563                 break;
3564         case NETDEV_CHANGENAME:
3565                 /*
3566                  * TODO: handle changing the primary's name
3567                  */
3568                 break;
3569         case NETDEV_FEAT_CHANGE:
3570                 bond_compute_features(bond);
3571                 break;
3572         default:
3573                 break;
3574         }
3575
3576         return NOTIFY_DONE;
3577 }
3578
3579 /*
3580  * bond_netdev_event: handle netdev notifier chain events.
3581  *
3582  * This function receives events for the netdev chain.  The caller (an
3583  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3584  * locks for us to safely manipulate the slave devices (RTNL lock,
3585  * dev_probe_lock).
3586  */
3587 static int bond_netdev_event(struct notifier_block *this,
3588                              unsigned long event, void *ptr)
3589 {
3590         struct net_device *event_dev = (struct net_device *)ptr;
3591
3592         pr_debug("event_dev: %s, event: %lx\n",
3593                  event_dev ? event_dev->name : "None",
3594                  event);
3595
3596         if (!(event_dev->priv_flags & IFF_BONDING))
3597                 return NOTIFY_DONE;
3598
3599         if (event_dev->flags & IFF_MASTER) {
3600                 pr_debug("IFF_MASTER\n");
3601                 return bond_master_netdev_event(event, event_dev);
3602         }
3603
3604         if (event_dev->flags & IFF_SLAVE) {
3605                 pr_debug("IFF_SLAVE\n");
3606                 return bond_slave_netdev_event(event, event_dev);
3607         }
3608
3609         return NOTIFY_DONE;
3610 }
3611
3612 /*
3613  * bond_inetaddr_event: handle inetaddr notifier chain events.
3614  *
3615  * We keep track of device IPs primarily to use as source addresses in
3616  * ARP monitor probes (rather than spewing out broadcasts all the time).
3617  *
3618  * We track one IP for the main device (if it has one), plus one per VLAN.
3619  */
3620 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3621 {
3622         struct in_ifaddr *ifa = ptr;
3623         struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3624         struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3625         struct bonding *bond;
3626         struct vlan_entry *vlan;
3627
3628         list_for_each_entry(bond, &bn->dev_list, bond_list) {
3629                 if (bond->dev == event_dev) {
3630                         switch (event) {
3631                         case NETDEV_UP:
3632                                 bond->master_ip = ifa->ifa_local;
3633                                 return NOTIFY_OK;
3634                         case NETDEV_DOWN:
3635                                 bond->master_ip = bond_glean_dev_ip(bond->dev);
3636                                 return NOTIFY_OK;
3637                         default:
3638                                 return NOTIFY_DONE;
3639                         }
3640                 }
3641
3642                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3643                         if (!bond->vlgrp)
3644                                 continue;
3645                         vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3646                         if (vlan_dev == event_dev) {
3647                                 switch (event) {
3648                                 case NETDEV_UP:
3649                                         vlan->vlan_ip = ifa->ifa_local;
3650                                         return NOTIFY_OK;
3651                                 case NETDEV_DOWN:
3652                                         vlan->vlan_ip =
3653                                                 bond_glean_dev_ip(vlan_dev);
3654                                         return NOTIFY_OK;
3655                                 default:
3656                                         return NOTIFY_DONE;
3657                                 }
3658                         }
3659                 }
3660         }
3661         return NOTIFY_DONE;
3662 }
3663
3664 static struct notifier_block bond_netdev_notifier = {
3665         .notifier_call = bond_netdev_event,
3666 };
3667
3668 static struct notifier_block bond_inetaddr_notifier = {
3669         .notifier_call = bond_inetaddr_event,
3670 };
3671
3672 /*-------------------------- Packet type handling ---------------------------*/
3673
3674 /* register to receive lacpdus on a bond */
3675 static void bond_register_lacpdu(struct bonding *bond)
3676 {
3677         struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3678
3679         /* initialize packet type */
3680         pk_type->type = PKT_TYPE_LACPDU;
3681         pk_type->dev = bond->dev;
3682         pk_type->func = bond_3ad_lacpdu_recv;
3683
3684         dev_add_pack(pk_type);
3685 }
3686
3687 /* unregister to receive lacpdus on a bond */
3688 static void bond_unregister_lacpdu(struct bonding *bond)
3689 {
3690         dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3691 }
3692
3693 void bond_register_arp(struct bonding *bond)
3694 {
3695         struct packet_type *pt = &bond->arp_mon_pt;
3696
3697         if (pt->type)
3698                 return;
3699
3700         pt->type = htons(ETH_P_ARP);
3701         pt->dev = bond->dev;
3702         pt->func = bond_arp_rcv;
3703         dev_add_pack(pt);
3704 }
3705
3706 void bond_unregister_arp(struct bonding *bond)
3707 {
3708         struct packet_type *pt = &bond->arp_mon_pt;
3709
3710         dev_remove_pack(pt);
3711         pt->type = 0;
3712 }
3713
3714 /*---------------------------- Hashing Policies -----------------------------*/
3715
3716 /*
3717  * Hash for the output device based upon layer 2 and layer 3 data. If
3718  * the packet is not IP mimic bond_xmit_hash_policy_l2()
3719  */
3720 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3721 {
3722         struct ethhdr *data = (struct ethhdr *)skb->data;
3723         struct iphdr *iph = ip_hdr(skb);
3724
3725         if (skb->protocol == htons(ETH_P_IP)) {
3726                 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3727                         (data->h_dest[5] ^ data->h_source[5])) % count;
3728         }
3729
3730         return (data->h_dest[5] ^ data->h_source[5]) % count;
3731 }
3732
3733 /*
3734  * Hash for the output device based upon layer 3 and layer 4 data. If
3735  * the packet is a frag or not TCP or UDP, just use layer 3 data.  If it is
3736  * altogether not IP, mimic bond_xmit_hash_policy_l2()
3737  */
3738 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3739 {
3740         struct ethhdr *data = (struct ethhdr *)skb->data;
3741         struct iphdr *iph = ip_hdr(skb);
3742         __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3743         int layer4_xor = 0;
3744
3745         if (skb->protocol == htons(ETH_P_IP)) {
3746                 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3747                     (iph->protocol == IPPROTO_TCP ||
3748                      iph->protocol == IPPROTO_UDP)) {
3749                         layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3750                 }
3751                 return (layer4_xor ^
3752                         ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3753
3754         }
3755
3756         return (data->h_dest[5] ^ data->h_source[5]) % count;
3757 }
3758
3759 /*
3760  * Hash for the output device based upon layer 2 data
3761  */
3762 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3763 {
3764         struct ethhdr *data = (struct ethhdr *)skb->data;
3765
3766         return (data->h_dest[5] ^ data->h_source[5]) % count;
3767 }
3768
3769 /*-------------------------- Device entry points ----------------------------*/
3770
3771 static int bond_open(struct net_device *bond_dev)
3772 {
3773         struct bonding *bond = netdev_priv(bond_dev);
3774
3775         bond->kill_timers = 0;
3776
3777         INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3778
3779         if (bond_is_lb(bond)) {
3780                 /* bond_alb_initialize must be called before the timer
3781                  * is started.
3782                  */
3783                 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3784                         /* something went wrong - fail the open operation */
3785                         return -ENOMEM;
3786                 }
3787
3788                 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3789                 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3790         }
3791
3792         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3793                 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3794                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3795         }
3796
3797         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3798                 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3799                         INIT_DELAYED_WORK(&bond->arp_work,
3800                                           bond_activebackup_arp_mon);
3801                 else
3802                         INIT_DELAYED_WORK(&bond->arp_work,
3803                                           bond_loadbalance_arp_mon);
3804
3805                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3806                 if (bond->params.arp_validate)
3807                         bond_register_arp(bond);
3808         }
3809
3810         if (bond->params.mode == BOND_MODE_8023AD) {
3811                 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3812                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3813                 /* register to receive LACPDUs */
3814                 bond_register_lacpdu(bond);
3815                 bond_3ad_initiate_agg_selection(bond, 1);
3816         }
3817
3818         return 0;
3819 }
3820
3821 static int bond_close(struct net_device *bond_dev)
3822 {
3823         struct bonding *bond = netdev_priv(bond_dev);
3824
3825         if (bond->params.mode == BOND_MODE_8023AD) {
3826                 /* Unregister the receive of LACPDUs */
3827                 bond_unregister_lacpdu(bond);
3828         }
3829
3830         if (bond->params.arp_validate)
3831                 bond_unregister_arp(bond);
3832
3833         write_lock_bh(&bond->lock);
3834
3835         bond->send_grat_arp = 0;
3836         bond->send_unsol_na = 0;
3837
3838         /* signal timers not to re-arm */
3839         bond->kill_timers = 1;
3840
3841         write_unlock_bh(&bond->lock);
3842
3843         if (bond->params.miimon) {  /* link check interval, in milliseconds. */
3844                 cancel_delayed_work(&bond->mii_work);
3845         }
3846
3847         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3848                 cancel_delayed_work(&bond->arp_work);
3849         }
3850
3851         switch (bond->params.mode) {
3852         case BOND_MODE_8023AD:
3853                 cancel_delayed_work(&bond->ad_work);
3854                 break;
3855         case BOND_MODE_TLB:
3856         case BOND_MODE_ALB:
3857                 cancel_delayed_work(&bond->alb_work);
3858                 break;
3859         default:
3860                 break;
3861         }
3862
3863         if (delayed_work_pending(&bond->mcast_work))
3864                 cancel_delayed_work(&bond->mcast_work);
3865
3866         if (bond_is_lb(bond)) {
3867                 /* Must be called only after all
3868                  * slaves have been released
3869                  */
3870                 bond_alb_deinitialize(bond);
3871         }
3872
3873         return 0;
3874 }
3875
3876 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3877                                                 struct rtnl_link_stats64 *stats)
3878 {
3879         struct bonding *bond = netdev_priv(bond_dev);
3880         struct rtnl_link_stats64 temp;
3881         struct slave *slave;
3882         int i;
3883
3884         memset(stats, 0, sizeof(*stats));
3885
3886         read_lock_bh(&bond->lock);
3887
3888         bond_for_each_slave(bond, slave, i) {
3889                 const struct rtnl_link_stats64 *sstats =
3890                         dev_get_stats(slave->dev, &temp);
3891
3892                 stats->rx_packets += sstats->rx_packets;
3893                 stats->rx_bytes += sstats->rx_bytes;
3894                 stats->rx_errors += sstats->rx_errors;
3895                 stats->rx_dropped += sstats->rx_dropped;
3896
3897                 stats->tx_packets += sstats->tx_packets;
3898                 stats->tx_bytes += sstats->tx_bytes;
3899                 stats->tx_errors += sstats->tx_errors;
3900                 stats->tx_dropped += sstats->tx_dropped;
3901
3902                 stats->multicast += sstats->multicast;
3903                 stats->collisions += sstats->collisions;
3904
3905                 stats->rx_length_errors += sstats->rx_length_errors;
3906                 stats->rx_over_errors += sstats->rx_over_errors;
3907                 stats->rx_crc_errors += sstats->rx_crc_errors;
3908                 stats->rx_frame_errors += sstats->rx_frame_errors;
3909                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3910                 stats->rx_missed_errors += sstats->rx_missed_errors;
3911
3912                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3913                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3914                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3915                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3916                 stats->tx_window_errors += sstats->tx_window_errors;
3917         }
3918
3919         read_unlock_bh(&bond->lock);
3920
3921         return stats;
3922 }
3923
3924 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3925 {
3926         struct net_device *slave_dev = NULL;
3927         struct ifbond k_binfo;
3928         struct ifbond __user *u_binfo = NULL;
3929         struct ifslave k_sinfo;
3930         struct ifslave __user *u_sinfo = NULL;
3931         struct mii_ioctl_data *mii = NULL;
3932         int res = 0;
3933
3934         pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3935
3936         switch (cmd) {
3937         case SIOCGMIIPHY:
3938                 mii = if_mii(ifr);
3939                 if (!mii)
3940                         return -EINVAL;
3941
3942                 mii->phy_id = 0;
3943                 /* Fall Through */
3944         case SIOCGMIIREG:
3945                 /*
3946                  * We do this again just in case we were called by SIOCGMIIREG
3947                  * instead of SIOCGMIIPHY.
3948                  */
3949                 mii = if_mii(ifr);
3950                 if (!mii)
3951                         return -EINVAL;
3952
3953
3954                 if (mii->reg_num == 1) {
3955                         struct bonding *bond = netdev_priv(bond_dev);
3956                         mii->val_out = 0;
3957                         read_lock(&bond->lock);
3958                         read_lock(&bond->curr_slave_lock);
3959                         if (netif_carrier_ok(bond->dev))
3960                                 mii->val_out = BMSR_LSTATUS;
3961
3962                         read_unlock(&bond->curr_slave_lock);
3963                         read_unlock(&bond->lock);
3964                 }
3965
3966                 return 0;
3967         case BOND_INFO_QUERY_OLD:
3968         case SIOCBONDINFOQUERY:
3969                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3970
3971                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3972                         return -EFAULT;
3973
3974                 res = bond_info_query(bond_dev, &k_binfo);
3975                 if (res == 0 &&
3976                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3977                         return -EFAULT;
3978
3979                 return res;
3980         case BOND_SLAVE_INFO_QUERY_OLD:
3981         case SIOCBONDSLAVEINFOQUERY:
3982                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3983
3984                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3985                         return -EFAULT;
3986
3987                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3988                 if (res == 0 &&
3989                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3990                         return -EFAULT;
3991
3992                 return res;
3993         default:
3994                 /* Go on */
3995                 break;
3996         }
3997
3998         if (!capable(CAP_NET_ADMIN))
3999                 return -EPERM;
4000
4001         slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
4002
4003         pr_debug("slave_dev=%p:\n", slave_dev);
4004
4005         if (!slave_dev)
4006                 res = -ENODEV;
4007         else {
4008                 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
4009                 switch (cmd) {
4010                 case BOND_ENSLAVE_OLD:
4011                 case SIOCBONDENSLAVE:
4012                         res = bond_enslave(bond_dev, slave_dev);
4013                         break;
4014                 case BOND_RELEASE_OLD:
4015                 case SIOCBONDRELEASE:
4016                         res = bond_release(bond_dev, slave_dev);
4017                         break;
4018                 case BOND_SETHWADDR_OLD:
4019                 case SIOCBONDSETHWADDR:
4020                         res = bond_sethwaddr(bond_dev, slave_dev);
4021                         break;
4022                 case BOND_CHANGE_ACTIVE_OLD:
4023                 case SIOCBONDCHANGEACTIVE:
4024                         res = bond_ioctl_change_active(bond_dev, slave_dev);
4025                         break;
4026                 default:
4027                         res = -EOPNOTSUPP;
4028                 }
4029
4030                 dev_put(slave_dev);
4031         }
4032
4033         return res;
4034 }
4035
4036 static bool bond_addr_in_mc_list(unsigned char *addr,
4037                                  struct netdev_hw_addr_list *list,
4038                                  int addrlen)
4039 {
4040         struct netdev_hw_addr *ha;
4041
4042         netdev_hw_addr_list_for_each(ha, list)
4043                 if (!memcmp(ha->addr, addr, addrlen))
4044                         return true;
4045
4046         return false;
4047 }
4048
4049 static void bond_set_multicast_list(struct net_device *bond_dev)
4050 {
4051         struct bonding *bond = netdev_priv(bond_dev);
4052         struct netdev_hw_addr *ha;
4053         bool found;
4054
4055         /*
4056          * Do promisc before checking multicast_mode
4057          */
4058         if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
4059                 /*
4060                  * FIXME: Need to handle the error when one of the multi-slaves
4061                  * encounters error.
4062                  */
4063                 bond_set_promiscuity(bond, 1);
4064
4065
4066         if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
4067                 bond_set_promiscuity(bond, -1);
4068
4069
4070         /* set allmulti flag to slaves */
4071         if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
4072                 /*
4073                  * FIXME: Need to handle the error when one of the multi-slaves
4074                  * encounters error.
4075                  */
4076                 bond_set_allmulti(bond, 1);
4077
4078
4079         if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
4080                 bond_set_allmulti(bond, -1);
4081
4082
4083         read_lock(&bond->lock);
4084
4085         bond->flags = bond_dev->flags;
4086
4087         /* looking for addresses to add to slaves' mc list */
4088         netdev_for_each_mc_addr(ha, bond_dev) {
4089                 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
4090                                              bond_dev->addr_len);
4091                 if (!found)
4092                         bond_mc_add(bond, ha->addr);
4093         }
4094
4095         /* looking for addresses to delete from slaves' list */
4096         netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
4097                 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
4098                                              bond_dev->addr_len);
4099                 if (!found)
4100                         bond_mc_del(bond, ha->addr);
4101         }
4102
4103         /* save master's multicast list */
4104         __hw_addr_flush(&bond->mc_list);
4105         __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
4106                                bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
4107
4108         read_unlock(&bond->lock);
4109 }
4110
4111 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
4112 {
4113         struct bonding *bond = netdev_priv(dev);
4114         struct slave *slave = bond->first_slave;
4115
4116         if (slave) {
4117                 const struct net_device_ops *slave_ops
4118                         = slave->dev->netdev_ops;
4119                 if (slave_ops->ndo_neigh_setup)
4120                         return slave_ops->ndo_neigh_setup(slave->dev, parms);
4121         }
4122         return 0;
4123 }
4124
4125 /*
4126  * Change the MTU of all of a master's slaves to match the master
4127  */
4128 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4129 {
4130         struct bonding *bond = netdev_priv(bond_dev);
4131         struct slave *slave, *stop_at;
4132         int res = 0;
4133         int i;
4134
4135         pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
4136                  (bond_dev ? bond_dev->name : "None"), new_mtu);
4137
4138         /* Can't hold bond->lock with bh disabled here since
4139          * some base drivers panic. On the other hand we can't
4140          * hold bond->lock without bh disabled because we'll
4141          * deadlock. The only solution is to rely on the fact
4142          * that we're under rtnl_lock here, and the slaves
4143          * list won't change. This doesn't solve the problem
4144          * of setting the slave's MTU while it is
4145          * transmitting, but the assumption is that the base
4146          * driver can handle that.
4147          *
4148          * TODO: figure out a way to safely iterate the slaves
4149          * list, but without holding a lock around the actual
4150          * call to the base driver.
4151          */
4152
4153         bond_for_each_slave(bond, slave, i) {
4154                 pr_debug("s %p s->p %p c_m %p\n",
4155                          slave,
4156                          slave->prev,
4157                          slave->dev->netdev_ops->ndo_change_mtu);
4158
4159                 res = dev_set_mtu(slave->dev, new_mtu);
4160
4161                 if (res) {
4162                         /* If we failed to set the slave's mtu to the new value
4163                          * we must abort the operation even in ACTIVE_BACKUP
4164                          * mode, because if we allow the backup slaves to have
4165                          * different mtu values than the active slave we'll
4166                          * need to change their mtu when doing a failover. That
4167                          * means changing their mtu from timer context, which
4168                          * is probably not a good idea.
4169                          */
4170                         pr_debug("err %d %s\n", res, slave->dev->name);
4171                         goto unwind;
4172                 }
4173         }
4174
4175         bond_dev->mtu = new_mtu;
4176
4177         return 0;
4178
4179 unwind:
4180         /* unwind from head to the slave that failed */
4181         stop_at = slave;
4182         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4183                 int tmp_res;
4184
4185                 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
4186                 if (tmp_res) {
4187                         pr_debug("unwind err %d dev %s\n",
4188                                  tmp_res, slave->dev->name);
4189                 }
4190         }
4191
4192         return res;
4193 }
4194
4195 /*
4196  * Change HW address
4197  *
4198  * Note that many devices must be down to change the HW address, and
4199  * downing the master releases all slaves.  We can make bonds full of
4200  * bonding devices to test this, however.
4201  */
4202 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4203 {
4204         struct bonding *bond = netdev_priv(bond_dev);
4205         struct sockaddr *sa = addr, tmp_sa;
4206         struct slave *slave, *stop_at;
4207         int res = 0;
4208         int i;
4209
4210         if (bond->params.mode == BOND_MODE_ALB)
4211                 return bond_alb_set_mac_address(bond_dev, addr);
4212
4213
4214         pr_debug("bond=%p, name=%s\n",
4215                  bond, bond_dev ? bond_dev->name : "None");
4216
4217         /*
4218          * If fail_over_mac is set to active, do nothing and return
4219          * success.  Returning an error causes ifenslave to fail.
4220          */
4221         if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4222                 return 0;
4223
4224         if (!is_valid_ether_addr(sa->sa_data))
4225                 return -EADDRNOTAVAIL;
4226
4227         /* Can't hold bond->lock with bh disabled here since
4228          * some base drivers panic. On the other hand we can't
4229          * hold bond->lock without bh disabled because we'll
4230          * deadlock. The only solution is to rely on the fact
4231          * that we're under rtnl_lock here, and the slaves
4232          * list won't change. This doesn't solve the problem
4233          * of setting the slave's hw address while it is
4234          * transmitting, but the assumption is that the base
4235          * driver can handle that.
4236          *
4237          * TODO: figure out a way to safely iterate the slaves
4238          * list, but without holding a lock around the actual
4239          * call to the base driver.
4240          */
4241
4242         bond_for_each_slave(bond, slave, i) {
4243                 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4244                 pr_debug("slave %p %s\n", slave, slave->dev->name);
4245
4246                 if (slave_ops->ndo_set_mac_address == NULL) {
4247                         res = -EOPNOTSUPP;
4248                         pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4249                         goto unwind;
4250                 }
4251
4252                 res = dev_set_mac_address(slave->dev, addr);
4253                 if (res) {
4254                         /* TODO: consider downing the slave
4255                          * and retry ?
4256                          * User should expect communications
4257                          * breakage anyway until ARP finish
4258                          * updating, so...
4259                          */
4260                         pr_debug("err %d %s\n", res, slave->dev->name);
4261                         goto unwind;
4262                 }
4263         }
4264
4265         /* success */
4266         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4267         return 0;
4268
4269 unwind:
4270         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4271         tmp_sa.sa_family = bond_dev->type;
4272
4273         /* unwind from head to the slave that failed */
4274         stop_at = slave;
4275         bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4276                 int tmp_res;
4277
4278                 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4279                 if (tmp_res) {
4280                         pr_debug("unwind err %d dev %s\n",
4281                                  tmp_res, slave->dev->name);
4282                 }
4283         }
4284
4285         return res;
4286 }
4287
4288 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4289 {
4290         struct bonding *bond = netdev_priv(bond_dev);
4291         struct slave *slave, *start_at;
4292         int i, slave_no, res = 1;
4293         struct iphdr *iph = ip_hdr(skb);
4294
4295         read_lock(&bond->lock);
4296
4297         if (!BOND_IS_OK(bond))
4298                 goto out;
4299         /*
4300          * Start with the curr_active_slave that joined the bond as the
4301          * default for sending IGMP traffic.  For failover purposes one
4302          * needs to maintain some consistency for the interface that will
4303          * send the join/membership reports.  The curr_active_slave found
4304          * will send all of this type of traffic.
4305          */
4306         if ((iph->protocol == IPPROTO_IGMP) &&
4307             (skb->protocol == htons(ETH_P_IP))) {
4308
4309                 read_lock(&bond->curr_slave_lock);
4310                 slave = bond->curr_active_slave;
4311                 read_unlock(&bond->curr_slave_lock);
4312
4313                 if (!slave)
4314                         goto out;
4315         } else {
4316                 /*
4317                  * Concurrent TX may collide on rr_tx_counter; we accept
4318                  * that as being rare enough not to justify using an
4319                  * atomic op here.
4320                  */
4321                 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4322
4323                 bond_for_each_slave(bond, slave, i) {
4324                         slave_no--;
4325                         if (slave_no < 0)
4326                                 break;
4327                 }
4328         }
4329
4330         start_at = slave;
4331         bond_for_each_slave_from(bond, slave, i, start_at) {
4332                 if (IS_UP(slave->dev) &&
4333                     (slave->link == BOND_LINK_UP) &&
4334                     (slave->state == BOND_STATE_ACTIVE)) {
4335                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4336                         break;
4337                 }
4338         }
4339
4340 out:
4341         if (res) {
4342                 /* no suitable interface, frame not sent */
4343                 dev_kfree_skb(skb);
4344         }
4345         read_unlock(&bond->lock);
4346         return NETDEV_TX_OK;
4347 }
4348
4349
4350 /*
4351  * in active-backup mode, we know that bond->curr_active_slave is always valid if
4352  * the bond has a usable interface.
4353  */
4354 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4355 {
4356         struct bonding *bond = netdev_priv(bond_dev);
4357         int res = 1;
4358
4359         read_lock(&bond->lock);
4360         read_lock(&bond->curr_slave_lock);
4361
4362         if (!BOND_IS_OK(bond))
4363                 goto out;
4364
4365         if (!bond->curr_active_slave)
4366                 goto out;
4367
4368         res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4369
4370 out:
4371         if (res)
4372                 /* no suitable interface, frame not sent */
4373                 dev_kfree_skb(skb);
4374
4375         read_unlock(&bond->curr_slave_lock);
4376         read_unlock(&bond->lock);
4377         return NETDEV_TX_OK;
4378 }
4379
4380 /*
4381  * In bond_xmit_xor() , we determine the output device by using a pre-
4382  * determined xmit_hash_policy(), If the selected device is not enabled,
4383  * find the next active slave.
4384  */
4385 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4386 {
4387         struct bonding *bond = netdev_priv(bond_dev);
4388         struct slave *slave, *start_at;
4389         int slave_no;
4390         int i;
4391         int res = 1;
4392
4393         read_lock(&bond->lock);
4394
4395         if (!BOND_IS_OK(bond))
4396                 goto out;
4397
4398         slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4399
4400         bond_for_each_slave(bond, slave, i) {
4401                 slave_no--;
4402                 if (slave_no < 0)
4403                         break;
4404         }
4405
4406         start_at = slave;
4407
4408         bond_for_each_slave_from(bond, slave, i, start_at) {
4409                 if (IS_UP(slave->dev) &&
4410                     (slave->link == BOND_LINK_UP) &&
4411                     (slave->state == BOND_STATE_ACTIVE)) {
4412                         res = bond_dev_queue_xmit(bond, skb, slave->dev);
4413                         break;
4414                 }
4415         }
4416
4417 out:
4418         if (res) {
4419                 /* no suitable interface, frame not sent */
4420                 dev_kfree_skb(skb);
4421         }
4422         read_unlock(&bond->lock);
4423         return NETDEV_TX_OK;
4424 }
4425
4426 /*
4427  * in broadcast mode, we send everything to all usable interfaces.
4428  */
4429 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4430 {
4431         struct bonding *bond = netdev_priv(bond_dev);
4432         struct slave *slave, *start_at;
4433         struct net_device *tx_dev = NULL;
4434         int i;
4435         int res = 1;
4436
4437         read_lock(&bond->lock);
4438
4439         if (!BOND_IS_OK(bond))
4440                 goto out;
4441
4442         read_lock(&bond->curr_slave_lock);
4443         start_at = bond->curr_active_slave;
4444         read_unlock(&bond->curr_slave_lock);
4445
4446         if (!start_at)
4447                 goto out;
4448
4449         bond_for_each_slave_from(bond, slave, i, start_at) {
4450                 if (IS_UP(slave->dev) &&
4451                     (slave->link == BOND_LINK_UP) &&
4452                     (slave->state == BOND_STATE_ACTIVE)) {
4453                         if (tx_dev) {
4454                                 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4455                                 if (!skb2) {
4456                                         pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4457                                                bond_dev->name);
4458                                         continue;
4459                                 }
4460
4461                                 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4462                                 if (res) {
4463                                         dev_kfree_skb(skb2);
4464                                         continue;
4465                                 }
4466                         }
4467                         tx_dev = slave->dev;
4468                 }
4469         }
4470
4471         if (tx_dev)
4472                 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4473
4474 out:
4475         if (res)
4476                 /* no suitable interface, frame not sent */
4477                 dev_kfree_skb(skb);
4478
4479         /* frame sent to all suitable interfaces */
4480         read_unlock(&bond->lock);
4481         return NETDEV_TX_OK;
4482 }
4483
4484 /*------------------------- Device initialization ---------------------------*/
4485
4486 static void bond_set_xmit_hash_policy(struct bonding *bond)
4487 {
4488         switch (bond->params.xmit_policy) {
4489         case BOND_XMIT_POLICY_LAYER23:
4490                 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4491                 break;
4492         case BOND_XMIT_POLICY_LAYER34:
4493                 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4494                 break;
4495         case BOND_XMIT_POLICY_LAYER2:
4496         default:
4497                 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4498                 break;
4499         }
4500 }
4501
4502 /*
4503  * Lookup the slave that corresponds to a qid
4504  */
4505 static inline int bond_slave_override(struct bonding *bond,
4506                                       struct sk_buff *skb)
4507 {
4508         int i, res = 1;
4509         struct slave *slave = NULL;
4510         struct slave *check_slave;
4511
4512         read_lock(&bond->lock);
4513
4514         if (!BOND_IS_OK(bond) || !skb->queue_mapping)
4515                 goto out;
4516
4517         /* Find out if any slaves have the same mapping as this skb. */
4518         bond_for_each_slave(bond, check_slave, i) {
4519                 if (check_slave->queue_id == skb->queue_mapping) {
4520                         slave = check_slave;
4521                         break;
4522                 }
4523         }
4524
4525         /* If the slave isn't UP, use default transmit policy. */
4526         if (slave && slave->queue_id && IS_UP(slave->dev) &&
4527             (slave->link == BOND_LINK_UP)) {
4528                 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4529         }
4530
4531 out:
4532         read_unlock(&bond->lock);
4533         return res;
4534 }
4535
4536 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4537 {
4538         /*
4539          * This helper function exists to help dev_pick_tx get the correct
4540          * destination queue.  Using a helper function skips the a call to
4541          * skb_tx_hash and will put the skbs in the queue we expect on their
4542          * way down to the bonding driver.
4543          */
4544         return skb->queue_mapping;
4545 }
4546
4547 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4548 {
4549         struct bonding *bond = netdev_priv(dev);
4550
4551         /*
4552          * If we risk deadlock from transmitting this in the
4553          * netpoll path, tell netpoll to queue the frame for later tx
4554          */
4555         if (is_netpoll_tx_blocked(dev))
4556                 return NETDEV_TX_BUSY;
4557
4558         if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4559                 if (!bond_slave_override(bond, skb))
4560                         return NETDEV_TX_OK;
4561         }
4562
4563         switch (bond->params.mode) {
4564         case BOND_MODE_ROUNDROBIN:
4565                 return bond_xmit_roundrobin(skb, dev);
4566         case BOND_MODE_ACTIVEBACKUP:
4567                 return bond_xmit_activebackup(skb, dev);
4568         case BOND_MODE_XOR:
4569                 return bond_xmit_xor(skb, dev);
4570         case BOND_MODE_BROADCAST:
4571                 return bond_xmit_broadcast(skb, dev);
4572         case BOND_MODE_8023AD:
4573                 return bond_3ad_xmit_xor(skb, dev);
4574         case BOND_MODE_ALB:
4575         case BOND_MODE_TLB:
4576                 return bond_alb_xmit(skb, dev);
4577         default:
4578                 /* Should never happen, mode already checked */
4579                 pr_err("%s: Error: Unknown bonding mode %d\n",
4580                        dev->name, bond->params.mode);
4581                 WARN_ON_ONCE(1);
4582                 dev_kfree_skb(skb);
4583                 return NETDEV_TX_OK;
4584         }
4585 }
4586
4587
4588 /*
4589  * set bond mode specific net device operations
4590  */
4591 void bond_set_mode_ops(struct bonding *bond, int mode)
4592 {
4593         struct net_device *bond_dev = bond->dev;
4594
4595         switch (mode) {
4596         case BOND_MODE_ROUNDROBIN:
4597                 break;
4598         case BOND_MODE_ACTIVEBACKUP:
4599                 break;
4600         case BOND_MODE_XOR:
4601                 bond_set_xmit_hash_policy(bond);
4602                 break;
4603         case BOND_MODE_BROADCAST:
4604                 break;
4605         case BOND_MODE_8023AD:
4606                 bond_set_master_3ad_flags(bond);
4607                 bond_set_xmit_hash_policy(bond);
4608                 break;
4609         case BOND_MODE_ALB:
4610                 bond_set_master_alb_flags(bond);
4611                 /* FALLTHRU */
4612         case BOND_MODE_TLB:
4613                 break;
4614         default:
4615                 /* Should never happen, mode already checked */
4616                 pr_err("%s: Error: Unknown bonding mode %d\n",
4617                        bond_dev->name, mode);
4618                 break;
4619         }
4620 }
4621
4622 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4623                                     struct ethtool_drvinfo *drvinfo)
4624 {
4625         strncpy(drvinfo->driver, DRV_NAME, 32);
4626         strncpy(drvinfo->version, DRV_VERSION, 32);
4627         snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4628 }
4629
4630 static const struct ethtool_ops bond_ethtool_ops = {
4631         .get_drvinfo            = bond_ethtool_get_drvinfo,
4632         .get_link               = ethtool_op_get_link,
4633         .get_tx_csum            = ethtool_op_get_tx_csum,
4634         .get_sg                 = ethtool_op_get_sg,
4635         .get_tso                = ethtool_op_get_tso,
4636         .get_ufo                = ethtool_op_get_ufo,
4637         .get_flags              = ethtool_op_get_flags,
4638 };
4639
4640 static const struct net_device_ops bond_netdev_ops = {
4641         .ndo_init               = bond_init,
4642         .ndo_uninit             = bond_uninit,
4643         .ndo_open               = bond_open,
4644         .ndo_stop               = bond_close,
4645         .ndo_start_xmit         = bond_start_xmit,
4646         .ndo_select_queue       = bond_select_queue,
4647         .ndo_get_stats64        = bond_get_stats,
4648         .ndo_do_ioctl           = bond_do_ioctl,
4649         .ndo_set_multicast_list = bond_set_multicast_list,
4650         .ndo_change_mtu         = bond_change_mtu,
4651         .ndo_set_mac_address    = bond_set_mac_address,
4652         .ndo_neigh_setup        = bond_neigh_setup,
4653         .ndo_vlan_rx_register   = bond_vlan_rx_register,
4654         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
4655         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
4656 #ifdef CONFIG_NET_POLL_CONTROLLER
4657         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
4658         .ndo_poll_controller    = bond_poll_controller,
4659 #endif
4660 };
4661
4662 static void bond_destructor(struct net_device *bond_dev)
4663 {
4664         struct bonding *bond = netdev_priv(bond_dev);
4665         if (bond->wq)
4666                 destroy_workqueue(bond->wq);
4667         free_netdev(bond_dev);
4668 }
4669
4670 static void bond_setup(struct net_device *bond_dev)
4671 {
4672         struct bonding *bond = netdev_priv(bond_dev);
4673
4674         /* initialize rwlocks */
4675         rwlock_init(&bond->lock);
4676         rwlock_init(&bond->curr_slave_lock);
4677
4678         bond->params = bonding_defaults;
4679
4680         /* Initialize pointers */
4681         bond->dev = bond_dev;
4682         INIT_LIST_HEAD(&bond->vlan_list);
4683
4684         /* Initialize the device entry points */
4685         ether_setup(bond_dev);
4686         bond_dev->netdev_ops = &bond_netdev_ops;
4687         bond_dev->ethtool_ops = &bond_ethtool_ops;
4688         bond_set_mode_ops(bond, bond->params.mode);
4689
4690         bond_dev->destructor = bond_destructor;
4691
4692         /* Initialize the device options */
4693         bond_dev->tx_queue_len = 0;
4694         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4695         bond_dev->priv_flags |= IFF_BONDING;
4696         bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4697
4698         if (bond->params.arp_interval)
4699                 bond_dev->priv_flags |= IFF_MASTER_ARPMON;
4700
4701         /* At first, we block adding VLANs. That's the only way to
4702          * prevent problems that occur when adding VLANs over an
4703          * empty bond. The block will be removed once non-challenged
4704          * slaves are enslaved.
4705          */
4706         bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4707
4708         /* don't acquire bond device's netif_tx_lock when
4709          * transmitting */
4710         bond_dev->features |= NETIF_F_LLTX;
4711
4712         /* By default, we declare the bond to be fully
4713          * VLAN hardware accelerated capable. Special
4714          * care is taken in the various xmit functions
4715          * when there are slaves that are not hw accel
4716          * capable
4717          */
4718         bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4719                                NETIF_F_HW_VLAN_RX |
4720                                NETIF_F_HW_VLAN_FILTER);
4721
4722         /* By default, we enable GRO on bonding devices.
4723          * Actual support requires lowlevel drivers are GRO ready.
4724          */
4725         bond_dev->features |= NETIF_F_GRO;
4726 }
4727
4728 static void bond_work_cancel_all(struct bonding *bond)
4729 {
4730         write_lock_bh(&bond->lock);
4731         bond->kill_timers = 1;
4732         write_unlock_bh(&bond->lock);
4733
4734         if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4735                 cancel_delayed_work(&bond->mii_work);
4736
4737         if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4738                 cancel_delayed_work(&bond->arp_work);
4739
4740         if (bond->params.mode == BOND_MODE_ALB &&
4741             delayed_work_pending(&bond->alb_work))
4742                 cancel_delayed_work(&bond->alb_work);
4743
4744         if (bond->params.mode == BOND_MODE_8023AD &&
4745             delayed_work_pending(&bond->ad_work))
4746                 cancel_delayed_work(&bond->ad_work);
4747
4748         if (delayed_work_pending(&bond->mcast_work))
4749                 cancel_delayed_work(&bond->mcast_work);
4750 }
4751
4752 /*
4753 * Destroy a bonding device.
4754 * Must be under rtnl_lock when this function is called.
4755 */
4756 static void bond_uninit(struct net_device *bond_dev)
4757 {
4758         struct bonding *bond = netdev_priv(bond_dev);
4759         struct vlan_entry *vlan, *tmp;
4760
4761         bond_netpoll_cleanup(bond_dev);
4762
4763         /* Release the bonded slaves */
4764         bond_release_all(bond_dev);
4765
4766         list_del(&bond->bond_list);
4767
4768         bond_work_cancel_all(bond);
4769
4770         bond_remove_proc_entry(bond);
4771
4772         __hw_addr_flush(&bond->mc_list);
4773
4774         list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4775                 list_del(&vlan->vlan_list);
4776                 kfree(vlan);
4777         }
4778 }
4779
4780 /*------------------------- Module initialization ---------------------------*/
4781
4782 /*
4783  * Convert string input module parms.  Accept either the
4784  * number of the mode or its string name.  A bit complicated because
4785  * some mode names are substrings of other names, and calls from sysfs
4786  * may have whitespace in the name (trailing newlines, for example).
4787  */
4788 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4789 {
4790         int modeint = -1, i, rv;
4791         char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4792
4793         for (p = (char *)buf; *p; p++)
4794                 if (!(isdigit(*p) || isspace(*p)))
4795                         break;
4796
4797         if (*p)
4798                 rv = sscanf(buf, "%20s", modestr);
4799         else
4800                 rv = sscanf(buf, "%d", &modeint);
4801
4802         if (!rv)
4803                 return -1;
4804
4805         for (i = 0; tbl[i].modename; i++) {
4806                 if (modeint == tbl[i].mode)
4807                         return tbl[i].mode;
4808                 if (strcmp(modestr, tbl[i].modename) == 0)
4809                         return tbl[i].mode;
4810         }
4811
4812         return -1;
4813 }
4814
4815 static int bond_check_params(struct bond_params *params)
4816 {
4817         int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4818
4819         /*
4820          * Convert string parameters.
4821          */
4822         if (mode) {
4823                 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4824                 if (bond_mode == -1) {
4825                         pr_err("Error: Invalid bonding mode \"%s\"\n",
4826                                mode == NULL ? "NULL" : mode);
4827                         return -EINVAL;
4828                 }
4829         }
4830
4831         if (xmit_hash_policy) {
4832                 if ((bond_mode != BOND_MODE_XOR) &&
4833                     (bond_mode != BOND_MODE_8023AD)) {
4834                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4835                                bond_mode_name(bond_mode));
4836                 } else {
4837                         xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4838                                                         xmit_hashtype_tbl);
4839                         if (xmit_hashtype == -1) {
4840                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4841                                        xmit_hash_policy == NULL ? "NULL" :
4842                                        xmit_hash_policy);
4843                                 return -EINVAL;
4844                         }
4845                 }
4846         }
4847
4848         if (lacp_rate) {
4849                 if (bond_mode != BOND_MODE_8023AD) {
4850                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4851                                 bond_mode_name(bond_mode));
4852                 } else {
4853                         lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4854                         if (lacp_fast == -1) {
4855                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4856                                        lacp_rate == NULL ? "NULL" : lacp_rate);
4857                                 return -EINVAL;
4858                         }
4859                 }
4860         }
4861
4862         if (ad_select) {
4863                 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4864                 if (params->ad_select == -1) {
4865                         pr_err("Error: Invalid ad_select \"%s\"\n",
4866                                ad_select == NULL ? "NULL" : ad_select);
4867                         return -EINVAL;
4868                 }
4869
4870                 if (bond_mode != BOND_MODE_8023AD) {
4871                         pr_warning("ad_select param only affects 802.3ad mode\n");
4872                 }
4873         } else {
4874                 params->ad_select = BOND_AD_STABLE;
4875         }
4876
4877         if (max_bonds < 0) {
4878                 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4879                            max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4880                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4881         }
4882
4883         if (miimon < 0) {
4884                 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4885                            miimon, INT_MAX, BOND_LINK_MON_INTERV);
4886                 miimon = BOND_LINK_MON_INTERV;
4887         }
4888
4889         if (updelay < 0) {
4890                 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4891                            updelay, INT_MAX);
4892                 updelay = 0;
4893         }
4894
4895         if (downdelay < 0) {
4896                 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4897                            downdelay, INT_MAX);
4898                 downdelay = 0;
4899         }
4900
4901         if ((use_carrier != 0) && (use_carrier != 1)) {
4902                 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4903                            use_carrier);
4904                 use_carrier = 1;
4905         }
4906
4907         if (num_grat_arp < 0 || num_grat_arp > 255) {
4908                 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1\n",
4909                            num_grat_arp);
4910                 num_grat_arp = 1;
4911         }
4912
4913         if (num_unsol_na < 0 || num_unsol_na > 255) {
4914                 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4915                            num_unsol_na);
4916                 num_unsol_na = 1;
4917         }
4918
4919         /* reset values for 802.3ad */
4920         if (bond_mode == BOND_MODE_8023AD) {
4921                 if (!miimon) {
4922                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4923                         pr_warning("Forcing miimon to 100msec\n");
4924                         miimon = 100;
4925                 }
4926         }
4927
4928         if (tx_queues < 1 || tx_queues > 255) {
4929                 pr_warning("Warning: tx_queues (%d) should be between "
4930                            "1 and 255, resetting to %d\n",
4931                            tx_queues, BOND_DEFAULT_TX_QUEUES);
4932                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4933         }
4934
4935         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4936                 pr_warning("Warning: all_slaves_active module parameter (%d), "
4937                            "not of valid value (0/1), so it was set to "
4938                            "0\n", all_slaves_active);
4939                 all_slaves_active = 0;
4940         }
4941
4942         if (resend_igmp < 0 || resend_igmp > 255) {
4943                 pr_warning("Warning: resend_igmp (%d) should be between "
4944                            "0 and 255, resetting to %d\n",
4945                            resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4946                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4947         }
4948
4949         /* reset values for TLB/ALB */
4950         if ((bond_mode == BOND_MODE_TLB) ||
4951             (bond_mode == BOND_MODE_ALB)) {
4952                 if (!miimon) {
4953                         pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4954                         pr_warning("Forcing miimon to 100msec\n");
4955                         miimon = 100;
4956                 }
4957         }
4958
4959         if (bond_mode == BOND_MODE_ALB) {
4960                 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4961                           updelay);
4962         }
4963
4964         if (!miimon) {
4965                 if (updelay || downdelay) {
4966                         /* just warn the user the up/down delay will have
4967                          * no effect since miimon is zero...
4968                          */
4969                         pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4970                                    updelay, downdelay);
4971                 }
4972         } else {
4973                 /* don't allow arp monitoring */
4974                 if (arp_interval) {
4975                         pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4976                                    miimon, arp_interval);
4977                         arp_interval = 0;
4978                 }
4979
4980                 if ((updelay % miimon) != 0) {
4981                         pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4982                                    updelay, miimon,
4983                                    (updelay / miimon) * miimon);
4984                 }
4985
4986                 updelay /= miimon;
4987
4988                 if ((downdelay % miimon) != 0) {
4989                         pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4990                                    downdelay, miimon,
4991                                    (downdelay / miimon) * miimon);
4992                 }
4993
4994                 downdelay /= miimon;
4995         }
4996
4997         if (arp_interval < 0) {
4998                 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4999                            arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
5000                 arp_interval = BOND_LINK_ARP_INTERV;
5001         }
5002
5003         for (arp_ip_count = 0;
5004              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
5005              arp_ip_count++) {
5006                 /* not complete check, but should be good enough to
5007                    catch mistakes */
5008                 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
5009                         pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
5010                                    arp_ip_target[arp_ip_count]);
5011                         arp_interval = 0;
5012                 } else {
5013                         __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
5014                         arp_target[arp_ip_count] = ip;
5015                 }
5016         }
5017
5018         if (arp_interval && !arp_ip_count) {
5019                 /* don't allow arping if no arp_ip_target given... */
5020                 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5021                            arp_interval);
5022                 arp_interval = 0;
5023         }
5024
5025         if (arp_validate) {
5026                 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
5027                         pr_err("arp_validate only supported in active-backup mode\n");
5028                         return -EINVAL;
5029                 }
5030                 if (!arp_interval) {
5031                         pr_err("arp_validate requires arp_interval\n");
5032                         return -EINVAL;
5033                 }
5034
5035                 arp_validate_value = bond_parse_parm(arp_validate,
5036                                                      arp_validate_tbl);
5037                 if (arp_validate_value == -1) {
5038                         pr_err("Error: invalid arp_validate \"%s\"\n",
5039                                arp_validate == NULL ? "NULL" : arp_validate);
5040                         return -EINVAL;
5041                 }
5042         } else
5043                 arp_validate_value = 0;
5044
5045         if (miimon) {
5046                 pr_info("MII link monitoring set to %d ms\n", miimon);
5047         } else if (arp_interval) {
5048                 int i;
5049
5050                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5051                         arp_interval,
5052                         arp_validate_tbl[arp_validate_value].modename,
5053                         arp_ip_count);
5054
5055                 for (i = 0; i < arp_ip_count; i++)
5056                         pr_info(" %s", arp_ip_target[i]);
5057
5058                 pr_info("\n");
5059
5060         } else if (max_bonds) {
5061                 /* miimon and arp_interval not set, we need one so things
5062                  * work as expected, see bonding.txt for details
5063                  */
5064                 pr_warning("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n");
5065         }
5066
5067         if (primary && !USES_PRIMARY(bond_mode)) {
5068                 /* currently, using a primary only makes sense
5069                  * in active backup, TLB or ALB modes
5070                  */
5071                 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
5072                            primary, bond_mode_name(bond_mode));
5073                 primary = NULL;
5074         }
5075
5076         if (primary && primary_reselect) {
5077                 primary_reselect_value = bond_parse_parm(primary_reselect,
5078                                                          pri_reselect_tbl);
5079                 if (primary_reselect_value == -1) {
5080                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
5081                                primary_reselect ==
5082                                         NULL ? "NULL" : primary_reselect);
5083                         return -EINVAL;
5084                 }
5085         } else {
5086                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5087         }
5088
5089         if (fail_over_mac) {
5090                 fail_over_mac_value = bond_parse_parm(fail_over_mac,
5091                                                       fail_over_mac_tbl);
5092                 if (fail_over_mac_value == -1) {
5093                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
5094                                arp_validate == NULL ? "NULL" : arp_validate);
5095                         return -EINVAL;
5096                 }
5097
5098                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5099                         pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
5100         } else {
5101                 fail_over_mac_value = BOND_FOM_NONE;
5102         }
5103
5104         /* fill params struct with the proper values */
5105         params->mode = bond_mode;
5106         params->xmit_policy = xmit_hashtype;
5107         params->miimon = miimon;
5108         params->num_grat_arp = num_grat_arp;
5109         params->num_unsol_na = num_unsol_na;
5110         params->arp_interval = arp_interval;
5111         params->arp_validate = arp_validate_value;
5112         params->updelay = updelay;
5113         params->downdelay = downdelay;
5114         params->use_carrier = use_carrier;
5115         params->lacp_fast = lacp_fast;
5116         params->primary[0] = 0;
5117         params->primary_reselect = primary_reselect_value;
5118         params->fail_over_mac = fail_over_mac_value;
5119         params->tx_queues = tx_queues;
5120         params->all_slaves_active = all_slaves_active;
5121         params->resend_igmp = resend_igmp;
5122
5123         if (primary) {
5124                 strncpy(params->primary, primary, IFNAMSIZ);
5125                 params->primary[IFNAMSIZ - 1] = 0;
5126         }
5127
5128         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5129
5130         return 0;
5131 }
5132
5133 static struct lock_class_key bonding_netdev_xmit_lock_key;
5134 static struct lock_class_key bonding_netdev_addr_lock_key;
5135
5136 static void bond_set_lockdep_class_one(struct net_device *dev,
5137                                        struct netdev_queue *txq,
5138                                        void *_unused)
5139 {
5140         lockdep_set_class(&txq->_xmit_lock,
5141                           &bonding_netdev_xmit_lock_key);
5142 }
5143
5144 static void bond_set_lockdep_class(struct net_device *dev)
5145 {
5146         lockdep_set_class(&dev->addr_list_lock,
5147                           &bonding_netdev_addr_lock_key);
5148         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
5149 }
5150
5151 /*
5152  * Called from registration process
5153  */
5154 static int bond_init(struct net_device *bond_dev)
5155 {
5156         struct bonding *bond = netdev_priv(bond_dev);
5157         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5158
5159         pr_debug("Begin bond_init for %s\n", bond_dev->name);
5160
5161         bond->wq = create_singlethread_workqueue(bond_dev->name);
5162         if (!bond->wq)
5163                 return -ENOMEM;
5164
5165         bond_set_lockdep_class(bond_dev);
5166
5167         netif_carrier_off(bond_dev);
5168
5169         bond_create_proc_entry(bond);
5170         list_add_tail(&bond->bond_list, &bn->dev_list);
5171
5172         bond_prepare_sysfs_group(bond);
5173
5174         __hw_addr_init(&bond->mc_list);
5175         return 0;
5176 }
5177
5178 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
5179 {
5180         if (tb[IFLA_ADDRESS]) {
5181                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
5182                         return -EINVAL;
5183                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
5184                         return -EADDRNOTAVAIL;
5185         }
5186         return 0;
5187 }
5188
5189 static struct rtnl_link_ops bond_link_ops __read_mostly = {
5190         .kind           = "bond",
5191         .priv_size      = sizeof(struct bonding),
5192         .setup          = bond_setup,
5193         .validate       = bond_validate,
5194 };
5195
5196 /* Create a new bond based on the specified name and bonding parameters.
5197  * If name is NULL, obtain a suitable "bond%d" name for us.
5198  * Caller must NOT hold rtnl_lock; we need to release it here before we
5199  * set up our sysfs entries.
5200  */
5201 int bond_create(struct net *net, const char *name)
5202 {
5203         struct net_device *bond_dev;
5204         int res;
5205
5206         rtnl_lock();
5207
5208         bond_dev = alloc_netdev_mq(sizeof(struct bonding), name ? name : "",
5209                                 bond_setup, tx_queues);
5210         if (!bond_dev) {
5211                 pr_err("%s: eek! can't alloc netdev!\n", name);
5212                 rtnl_unlock();
5213                 return -ENOMEM;
5214         }
5215
5216         dev_net_set(bond_dev, net);
5217         bond_dev->rtnl_link_ops = &bond_link_ops;
5218
5219         if (!name) {
5220                 res = dev_alloc_name(bond_dev, "bond%d");
5221                 if (res < 0)
5222                         goto out;
5223         } else {
5224                 /*
5225                  * If we're given a name to register
5226                  * we need to ensure that its not already
5227                  * registered
5228                  */
5229                 res = -EEXIST;
5230                 if (__dev_get_by_name(net, name) != NULL)
5231                         goto out;
5232         }
5233
5234         res = register_netdevice(bond_dev);
5235
5236 out:
5237         rtnl_unlock();
5238         if (res < 0)
5239                 bond_destructor(bond_dev);
5240         return res;
5241 }
5242
5243 static int __net_init bond_net_init(struct net *net)
5244 {
5245         struct bond_net *bn = net_generic(net, bond_net_id);
5246
5247         bn->net = net;
5248         INIT_LIST_HEAD(&bn->dev_list);
5249
5250         bond_create_proc_dir(bn);
5251         
5252         return 0;
5253 }
5254
5255 static void __net_exit bond_net_exit(struct net *net)
5256 {
5257         struct bond_net *bn = net_generic(net, bond_net_id);
5258
5259         bond_destroy_proc_dir(bn);
5260 }
5261
5262 static struct pernet_operations bond_net_ops = {
5263         .init = bond_net_init,
5264         .exit = bond_net_exit,
5265         .id   = &bond_net_id,
5266         .size = sizeof(struct bond_net),
5267 };
5268
5269 static int __init bonding_init(void)
5270 {
5271         int i;
5272         int res;
5273
5274         pr_info("%s", version);
5275
5276         res = bond_check_params(&bonding_defaults);
5277         if (res)
5278                 goto out;
5279
5280         res = register_pernet_subsys(&bond_net_ops);
5281         if (res)
5282                 goto out;
5283
5284         res = rtnl_link_register(&bond_link_ops);
5285         if (res)
5286                 goto err_link;
5287
5288         for (i = 0; i < max_bonds; i++) {
5289                 res = bond_create(&init_net, NULL);
5290                 if (res)
5291                         goto err;
5292         }
5293
5294         res = bond_create_sysfs();
5295         if (res)
5296                 goto err;
5297
5298
5299         register_netdevice_notifier(&bond_netdev_notifier);
5300         register_inetaddr_notifier(&bond_inetaddr_notifier);
5301         bond_register_ipv6_notifier();
5302 out:
5303         return res;
5304 err:
5305         rtnl_link_unregister(&bond_link_ops);
5306 err_link:
5307         unregister_pernet_subsys(&bond_net_ops);
5308         goto out;
5309
5310 }
5311
5312 static void __exit bonding_exit(void)
5313 {
5314         unregister_netdevice_notifier(&bond_netdev_notifier);
5315         unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5316         bond_unregister_ipv6_notifier();
5317
5318         bond_destroy_sysfs();
5319
5320         rtnl_link_unregister(&bond_link_ops);
5321         unregister_pernet_subsys(&bond_net_ops);
5322
5323 #ifdef CONFIG_NET_POLL_CONTROLLER
5324         /*
5325          * Make sure we don't have an imbalance on our netpoll blocking
5326          */
5327         WARN_ON(atomic_read(&netpoll_block_tx));
5328 #endif
5329 }
5330
5331 module_init(bonding_init);
5332 module_exit(bonding_exit);
5333 MODULE_LICENSE("GPL");
5334 MODULE_VERSION(DRV_VERSION);
5335 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5336 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5337 MODULE_ALIAS_RTNL_LINK("bond");