bonding: process the err returned by dev_set_allmulti properly in bond_enslave
[pandora-kernel.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/inetdevice.h>
63 #include <linux/igmp.h>
64 #include <linux/etherdevice.h>
65 #include <linux/skbuff.h>
66 #include <net/sock.h>
67 #include <linux/rtnetlink.h>
68 #include <linux/smp.h>
69 #include <linux/if_ether.h>
70 #include <net/arp.h>
71 #include <linux/mii.h>
72 #include <linux/ethtool.h>
73 #include <linux/if_vlan.h>
74 #include <linux/if_bonding.h>
75 #include <linux/jiffies.h>
76 #include <linux/preempt.h>
77 #include <net/route.h>
78 #include <net/net_namespace.h>
79 #include <net/netns/generic.h>
80 #include <net/pkt_sched.h>
81 #include "bonding.h"
82 #include "bond_3ad.h"
83 #include "bond_alb.h"
84
85 /*---------------------------- Module parameters ----------------------------*/
86
87 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
88 #define BOND_LINK_MON_INTERV    0
89 #define BOND_LINK_ARP_INTERV    0
90
91 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
92 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
93 static int num_peer_notif = 1;
94 static int miimon       = BOND_LINK_MON_INTERV;
95 static int updelay;
96 static int downdelay;
97 static int use_carrier  = 1;
98 static char *mode;
99 static char *primary;
100 static char *primary_reselect;
101 static char *lacp_rate;
102 static int min_links;
103 static char *ad_select;
104 static char *xmit_hash_policy;
105 static int arp_interval = BOND_LINK_ARP_INTERV;
106 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
107 static char *arp_validate;
108 static char *fail_over_mac;
109 static int all_slaves_active = 0;
110 static struct bond_params bonding_defaults;
111 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112
113 module_param(max_bonds, int, 0);
114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
115 module_param(tx_queues, int, 0);
116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
117 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
119                                "failover event (alias of num_unsol_na)");
120 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
122                                "failover event (alias of num_grat_arp)");
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                             "0 for slow, 1 for fast");
151 module_param(ad_select, charp, 0);
152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
153                             "0 for stable (default), 1 for bandwidth, "
154                             "2 for count");
155 module_param(min_links, int, 0);
156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
157
158 module_param(xmit_hash_policy, charp, 0);
159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
160                                    "0 for layer 2 (default), 1 for layer 3+4, "
161                                    "2 for layer 2+3");
162 module_param(arp_interval, int, 0);
163 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
164 module_param_array(arp_ip_target, charp, NULL, 0);
165 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
166 module_param(arp_validate, charp, 0);
167 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
168                                "0 for none (default), 1 for active, "
169                                "2 for backup, 3 for all");
170 module_param(fail_over_mac, charp, 0);
171 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
172                                 "the same MAC; 0 for none (default), "
173                                 "1 for active, 2 for follow");
174 module_param(all_slaves_active, int, 0);
175 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
176                                      "by setting active flag for all slaves; "
177                                      "0 for never (default), 1 for always.");
178 module_param(resend_igmp, int, 0);
179 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
180                               "link failure");
181
182 /*----------------------------- Global variables ----------------------------*/
183
184 #ifdef CONFIG_NET_POLL_CONTROLLER
185 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
186 #endif
187
188 int bond_net_id __read_mostly;
189
190 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
191 static int arp_ip_count;
192 static int bond_mode    = BOND_MODE_ROUNDROBIN;
193 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
194 static int lacp_fast;
195
196 const struct bond_parm_tbl bond_lacp_tbl[] = {
197 {       "slow",         AD_LACP_SLOW},
198 {       "fast",         AD_LACP_FAST},
199 {       NULL,           -1},
200 };
201
202 const struct bond_parm_tbl bond_mode_tbl[] = {
203 {       "balance-rr",           BOND_MODE_ROUNDROBIN},
204 {       "active-backup",        BOND_MODE_ACTIVEBACKUP},
205 {       "balance-xor",          BOND_MODE_XOR},
206 {       "broadcast",            BOND_MODE_BROADCAST},
207 {       "802.3ad",              BOND_MODE_8023AD},
208 {       "balance-tlb",          BOND_MODE_TLB},
209 {       "balance-alb",          BOND_MODE_ALB},
210 {       NULL,                   -1},
211 };
212
213 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
214 {       "layer2",               BOND_XMIT_POLICY_LAYER2},
215 {       "layer3+4",             BOND_XMIT_POLICY_LAYER34},
216 {       "layer2+3",             BOND_XMIT_POLICY_LAYER23},
217 {       NULL,                   -1},
218 };
219
220 const struct bond_parm_tbl arp_validate_tbl[] = {
221 {       "none",                 BOND_ARP_VALIDATE_NONE},
222 {       "active",               BOND_ARP_VALIDATE_ACTIVE},
223 {       "backup",               BOND_ARP_VALIDATE_BACKUP},
224 {       "all",                  BOND_ARP_VALIDATE_ALL},
225 {       NULL,                   -1},
226 };
227
228 const struct bond_parm_tbl fail_over_mac_tbl[] = {
229 {       "none",                 BOND_FOM_NONE},
230 {       "active",               BOND_FOM_ACTIVE},
231 {       "follow",               BOND_FOM_FOLLOW},
232 {       NULL,                   -1},
233 };
234
235 const struct bond_parm_tbl pri_reselect_tbl[] = {
236 {       "always",               BOND_PRI_RESELECT_ALWAYS},
237 {       "better",               BOND_PRI_RESELECT_BETTER},
238 {       "failure",              BOND_PRI_RESELECT_FAILURE},
239 {       NULL,                   -1},
240 };
241
242 struct bond_parm_tbl ad_select_tbl[] = {
243 {       "stable",       BOND_AD_STABLE},
244 {       "bandwidth",    BOND_AD_BANDWIDTH},
245 {       "count",        BOND_AD_COUNT},
246 {       NULL,           -1},
247 };
248
249 /*-------------------------- Forward declarations ---------------------------*/
250
251 static int bond_init(struct net_device *bond_dev);
252 static void bond_uninit(struct net_device *bond_dev);
253
254 /*---------------------------- General routines -----------------------------*/
255
256 const char *bond_mode_name(int mode)
257 {
258         static const char *names[] = {
259                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
260                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
261                 [BOND_MODE_XOR] = "load balancing (xor)",
262                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
263                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
264                 [BOND_MODE_TLB] = "transmit load balancing",
265                 [BOND_MODE_ALB] = "adaptive load balancing",
266         };
267
268         if (mode < 0 || mode > BOND_MODE_ALB)
269                 return "unknown";
270
271         return names[mode];
272 }
273
274 /*---------------------------------- VLAN -----------------------------------*/
275
276 /**
277  * bond_add_vlan - add a new vlan id on bond
278  * @bond: bond that got the notification
279  * @vlan_id: the vlan id to add
280  *
281  * Returns -ENOMEM if allocation failed.
282  */
283 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
284 {
285         struct vlan_entry *vlan;
286
287         pr_debug("bond: %s, vlan id %d\n",
288                  (bond ? bond->dev->name : "None"), vlan_id);
289
290         vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
291         if (!vlan)
292                 return -ENOMEM;
293
294         INIT_LIST_HEAD(&vlan->vlan_list);
295         vlan->vlan_id = vlan_id;
296
297         write_lock_bh(&bond->lock);
298
299         list_add_tail(&vlan->vlan_list, &bond->vlan_list);
300
301         write_unlock_bh(&bond->lock);
302
303         pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
304
305         return 0;
306 }
307
308 /**
309  * bond_del_vlan - delete a vlan id from bond
310  * @bond: bond that got the notification
311  * @vlan_id: the vlan id to delete
312  *
313  * returns -ENODEV if @vlan_id was not found in @bond.
314  */
315 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
316 {
317         struct vlan_entry *vlan;
318         int res = -ENODEV;
319
320         pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
321
322         block_netpoll_tx();
323         write_lock_bh(&bond->lock);
324
325         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
326                 if (vlan->vlan_id == vlan_id) {
327                         list_del(&vlan->vlan_list);
328
329                         if (bond_is_lb(bond))
330                                 bond_alb_clear_vlan(bond, vlan_id);
331
332                         pr_debug("removed VLAN ID %d from bond %s\n",
333                                  vlan_id, bond->dev->name);
334
335                         kfree(vlan);
336
337                         res = 0;
338                         goto out;
339                 }
340         }
341
342         pr_debug("couldn't find VLAN ID %d in bond %s\n",
343                  vlan_id, bond->dev->name);
344
345 out:
346         write_unlock_bh(&bond->lock);
347         unblock_netpoll_tx();
348         return res;
349 }
350
351 /**
352  * bond_next_vlan - safely skip to the next item in the vlans list.
353  * @bond: the bond we're working on
354  * @curr: item we're advancing from
355  *
356  * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
357  * or @curr->next otherwise (even if it is @curr itself again).
358  *
359  * Caller must hold bond->lock
360  */
361 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
362 {
363         struct vlan_entry *next, *last;
364
365         if (list_empty(&bond->vlan_list))
366                 return NULL;
367
368         if (!curr) {
369                 next = list_entry(bond->vlan_list.next,
370                                   struct vlan_entry, vlan_list);
371         } else {
372                 last = list_entry(bond->vlan_list.prev,
373                                   struct vlan_entry, vlan_list);
374                 if (last == curr) {
375                         next = list_entry(bond->vlan_list.next,
376                                           struct vlan_entry, vlan_list);
377                 } else {
378                         next = list_entry(curr->vlan_list.next,
379                                           struct vlan_entry, vlan_list);
380                 }
381         }
382
383         return next;
384 }
385
386 /**
387  * bond_dev_queue_xmit - Prepare skb for xmit.
388  *
389  * @bond: bond device that got this skb for tx.
390  * @skb: hw accel VLAN tagged skb to transmit
391  * @slave_dev: slave that is supposed to xmit this skbuff
392  */
393 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
394                         struct net_device *slave_dev)
395 {
396         skb->dev = slave_dev;
397
398         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
399                      sizeof(qdisc_skb_cb(skb)->bond_queue_mapping));
400         skb->queue_mapping = qdisc_skb_cb(skb)->bond_queue_mapping;
401
402         if (unlikely(netpoll_tx_running(slave_dev)))
403                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
404         else
405                 dev_queue_xmit(skb);
406
407         return 0;
408 }
409
410 /*
411  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
412  * We don't protect the slave list iteration with a lock because:
413  * a. This operation is performed in IOCTL context,
414  * b. The operation is protected by the RTNL semaphore in the 8021q code,
415  * c. Holding a lock with BH disabled while directly calling a base driver
416  *    entry point is generally a BAD idea.
417  *
418  * The design of synchronization/protection for this operation in the 8021q
419  * module is good for one or more VLAN devices over a single physical device
420  * and cannot be extended for a teaming solution like bonding, so there is a
421  * potential race condition here where a net device from the vlan group might
422  * be referenced (either by a base driver or the 8021q code) while it is being
423  * removed from the system. However, it turns out we're not making matters
424  * worse, and if it works for regular VLAN usage it will work here too.
425 */
426
427 /**
428  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
429  * @bond_dev: bonding net device that got called
430  * @vid: vlan id being added
431  */
432 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
433 {
434         struct bonding *bond = netdev_priv(bond_dev);
435         struct slave *slave;
436         int i, res;
437
438         bond_for_each_slave(bond, slave, i) {
439                 struct net_device *slave_dev = slave->dev;
440                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441
442                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
443                     slave_ops->ndo_vlan_rx_add_vid) {
444                         slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
445                 }
446         }
447
448         res = bond_add_vlan(bond, vid);
449         if (res) {
450                 pr_err("%s: Error: Failed to add vlan id %d\n",
451                        bond_dev->name, vid);
452         }
453 }
454
455 /**
456  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
457  * @bond_dev: bonding net device that got called
458  * @vid: vlan id being removed
459  */
460 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
461 {
462         struct bonding *bond = netdev_priv(bond_dev);
463         struct slave *slave;
464         int i, res;
465
466         bond_for_each_slave(bond, slave, i) {
467                 struct net_device *slave_dev = slave->dev;
468                 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
469
470                 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
471                     slave_ops->ndo_vlan_rx_kill_vid) {
472                         slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
473                 }
474         }
475
476         res = bond_del_vlan(bond, vid);
477         if (res) {
478                 pr_err("%s: Error: Failed to remove vlan id %d\n",
479                        bond_dev->name, vid);
480         }
481 }
482
483 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
484 {
485         struct vlan_entry *vlan;
486         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
487
488         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
489             !(slave_ops->ndo_vlan_rx_add_vid))
490                 return;
491
492         list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
493                 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
494 }
495
496 static void bond_del_vlans_from_slave(struct bonding *bond,
497                                       struct net_device *slave_dev)
498 {
499         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
500         struct vlan_entry *vlan;
501
502         if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
503             !(slave_ops->ndo_vlan_rx_kill_vid))
504                 return;
505
506         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
507                 if (!vlan->vlan_id)
508                         continue;
509                 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
510         }
511 }
512
513 /*------------------------------- Link status -------------------------------*/
514
515 /*
516  * Set the carrier state for the master according to the state of its
517  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
518  * do special 802.3ad magic.
519  *
520  * Returns zero if carrier state does not change, nonzero if it does.
521  */
522 static int bond_set_carrier(struct bonding *bond)
523 {
524         struct slave *slave;
525         int i;
526
527         if (bond->slave_cnt == 0)
528                 goto down;
529
530         if (bond->params.mode == BOND_MODE_8023AD)
531                 return bond_3ad_set_carrier(bond);
532
533         bond_for_each_slave(bond, slave, i) {
534                 if (slave->link == BOND_LINK_UP) {
535                         if (!netif_carrier_ok(bond->dev)) {
536                                 netif_carrier_on(bond->dev);
537                                 return 1;
538                         }
539                         return 0;
540                 }
541         }
542
543 down:
544         if (netif_carrier_ok(bond->dev)) {
545                 netif_carrier_off(bond->dev);
546                 return 1;
547         }
548         return 0;
549 }
550
551 /*
552  * Get link speed and duplex from the slave's base driver
553  * using ethtool. If for some reason the call fails or the
554  * values are invalid, set speed and duplex to -1,
555  * and return error.
556  */
557 static int bond_update_speed_duplex(struct slave *slave)
558 {
559         struct net_device *slave_dev = slave->dev;
560         struct ethtool_cmd ecmd;
561         u32 slave_speed;
562         int res;
563
564         slave->speed = SPEED_UNKNOWN;
565         slave->duplex = DUPLEX_UNKNOWN;
566
567         res = __ethtool_get_settings(slave_dev, &ecmd);
568         if (res < 0)
569                 return -1;
570
571         slave_speed = ethtool_cmd_speed(&ecmd);
572         if (slave_speed == 0 || slave_speed == ((__u32) -1))
573                 return -1;
574
575         switch (ecmd.duplex) {
576         case DUPLEX_FULL:
577         case DUPLEX_HALF:
578                 break;
579         default:
580                 return -1;
581         }
582
583         slave->speed = slave_speed;
584         slave->duplex = ecmd.duplex;
585
586         return 0;
587 }
588
589 /*
590  * if <dev> supports MII link status reporting, check its link status.
591  *
592  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
593  * depending upon the setting of the use_carrier parameter.
594  *
595  * Return either BMSR_LSTATUS, meaning that the link is up (or we
596  * can't tell and just pretend it is), or 0, meaning that the link is
597  * down.
598  *
599  * If reporting is non-zero, instead of faking link up, return -1 if
600  * both ETHTOOL and MII ioctls fail (meaning the device does not
601  * support them).  If use_carrier is set, return whatever it says.
602  * It'd be nice if there was a good way to tell if a driver supports
603  * netif_carrier, but there really isn't.
604  */
605 static int bond_check_dev_link(struct bonding *bond,
606                                struct net_device *slave_dev, int reporting)
607 {
608         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
609         int (*ioctl)(struct net_device *, struct ifreq *, int);
610         struct ifreq ifr;
611         struct mii_ioctl_data *mii;
612
613         if (!reporting && !netif_running(slave_dev))
614                 return 0;
615
616         if (bond->params.use_carrier)
617                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
618
619         /* Try to get link status using Ethtool first. */
620         if (slave_dev->ethtool_ops) {
621                 if (slave_dev->ethtool_ops->get_link) {
622                         u32 link;
623
624                         link = slave_dev->ethtool_ops->get_link(slave_dev);
625
626                         return link ? BMSR_LSTATUS : 0;
627                 }
628         }
629
630         /* Ethtool can't be used, fallback to MII ioctls. */
631         ioctl = slave_ops->ndo_do_ioctl;
632         if (ioctl) {
633                 /* TODO: set pointer to correct ioctl on a per team member */
634                 /*       bases to make this more efficient. that is, once  */
635                 /*       we determine the correct ioctl, we will always    */
636                 /*       call it and not the others for that team          */
637                 /*       member.                                           */
638
639                 /*
640                  * We cannot assume that SIOCGMIIPHY will also read a
641                  * register; not all network drivers (e.g., e100)
642                  * support that.
643                  */
644
645                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
646                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
647                 mii = if_mii(&ifr);
648                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
649                         mii->reg_num = MII_BMSR;
650                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
651                                 return mii->val_out & BMSR_LSTATUS;
652                 }
653         }
654
655         /*
656          * If reporting, report that either there's no dev->do_ioctl,
657          * or both SIOCGMIIREG and get_link failed (meaning that we
658          * cannot report link status).  If not reporting, pretend
659          * we're ok.
660          */
661         return reporting ? -1 : BMSR_LSTATUS;
662 }
663
664 /*----------------------------- Multicast list ------------------------------*/
665
666 /*
667  * Push the promiscuity flag down to appropriate slaves
668  */
669 static int bond_set_promiscuity(struct bonding *bond, int inc)
670 {
671         int err = 0;
672         if (USES_PRIMARY(bond->params.mode)) {
673                 /* write lock already acquired */
674                 if (bond->curr_active_slave) {
675                         err = dev_set_promiscuity(bond->curr_active_slave->dev,
676                                                   inc);
677                 }
678         } else {
679                 struct slave *slave;
680                 int i;
681                 bond_for_each_slave(bond, slave, i) {
682                         err = dev_set_promiscuity(slave->dev, inc);
683                         if (err)
684                                 return err;
685                 }
686         }
687         return err;
688 }
689
690 /*
691  * Push the allmulti flag down to all slaves
692  */
693 static int bond_set_allmulti(struct bonding *bond, int inc)
694 {
695         int err = 0;
696         if (USES_PRIMARY(bond->params.mode)) {
697                 /* write lock already acquired */
698                 if (bond->curr_active_slave) {
699                         err = dev_set_allmulti(bond->curr_active_slave->dev,
700                                                inc);
701                 }
702         } else {
703                 struct slave *slave;
704                 int i;
705                 bond_for_each_slave(bond, slave, i) {
706                         err = dev_set_allmulti(slave->dev, inc);
707                         if (err)
708                                 return err;
709                 }
710         }
711         return err;
712 }
713
714 /*
715  * Add a Multicast address to slaves
716  * according to mode
717  */
718 static void bond_mc_add(struct bonding *bond, void *addr)
719 {
720         if (USES_PRIMARY(bond->params.mode)) {
721                 /* write lock already acquired */
722                 if (bond->curr_active_slave)
723                         dev_mc_add(bond->curr_active_slave->dev, addr);
724         } else {
725                 struct slave *slave;
726                 int i;
727
728                 bond_for_each_slave(bond, slave, i)
729                         dev_mc_add(slave->dev, addr);
730         }
731 }
732
733 /*
734  * Remove a multicast address from slave
735  * according to mode
736  */
737 static void bond_mc_del(struct bonding *bond, void *addr)
738 {
739         if (USES_PRIMARY(bond->params.mode)) {
740                 /* write lock already acquired */
741                 if (bond->curr_active_slave)
742                         dev_mc_del(bond->curr_active_slave->dev, addr);
743         } else {
744                 struct slave *slave;
745                 int i;
746                 bond_for_each_slave(bond, slave, i) {
747                         dev_mc_del(slave->dev, addr);
748                 }
749         }
750 }
751
752
753 static void __bond_resend_igmp_join_requests(struct net_device *dev)
754 {
755         struct in_device *in_dev;
756
757         rcu_read_lock();
758         in_dev = __in_dev_get_rcu(dev);
759         if (in_dev)
760                 ip_mc_rejoin_groups(in_dev);
761         rcu_read_unlock();
762 }
763
764 /*
765  * Retrieve the list of registered multicast addresses for the bonding
766  * device and retransmit an IGMP JOIN request to the current active
767  * slave.
768  */
769 static void bond_resend_igmp_join_requests(struct bonding *bond)
770 {
771         struct net_device *vlan_dev;
772         struct vlan_entry *vlan;
773
774         read_lock(&bond->lock);
775
776         /* rejoin all groups on bond device */
777         __bond_resend_igmp_join_requests(bond->dev);
778
779         /* rejoin all groups on vlan devices */
780         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
781                 rcu_read_lock();
782                 vlan_dev = __vlan_find_dev_deep(bond->dev,
783                                                 vlan->vlan_id);
784                 rcu_read_unlock();
785                 if (vlan_dev)
786                         __bond_resend_igmp_join_requests(vlan_dev);
787         }
788
789         if (--bond->igmp_retrans > 0)
790                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
791
792         read_unlock(&bond->lock);
793 }
794
795 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
796 {
797         struct bonding *bond = container_of(work, struct bonding,
798                                             mcast_work.work);
799         bond_resend_igmp_join_requests(bond);
800 }
801
802 /*
803  * flush all members of flush->mc_list from device dev->mc_list
804  */
805 static void bond_mc_list_flush(struct net_device *bond_dev,
806                                struct net_device *slave_dev)
807 {
808         struct bonding *bond = netdev_priv(bond_dev);
809         struct netdev_hw_addr *ha;
810
811         netdev_for_each_mc_addr(ha, bond_dev)
812                 dev_mc_del(slave_dev, ha->addr);
813
814         if (bond->params.mode == BOND_MODE_8023AD) {
815                 /* del lacpdu mc addr from mc list */
816                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
817
818                 dev_mc_del(slave_dev, lacpdu_multicast);
819         }
820 }
821
822 /*--------------------------- Active slave change ---------------------------*/
823
824 /*
825  * Update the mc list and multicast-related flags for the new and
826  * old active slaves (if any) according to the multicast mode, and
827  * promiscuous flags unconditionally.
828  */
829 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
830                          struct slave *old_active)
831 {
832         struct netdev_hw_addr *ha;
833
834         if (!USES_PRIMARY(bond->params.mode))
835                 /* nothing to do -  mc list is already up-to-date on
836                  * all slaves
837                  */
838                 return;
839
840         if (old_active) {
841                 if (bond->dev->flags & IFF_PROMISC)
842                         dev_set_promiscuity(old_active->dev, -1);
843
844                 if (bond->dev->flags & IFF_ALLMULTI)
845                         dev_set_allmulti(old_active->dev, -1);
846
847                 netdev_for_each_mc_addr(ha, bond->dev)
848                         dev_mc_del(old_active->dev, ha->addr);
849         }
850
851         if (new_active) {
852                 /* FIXME: Signal errors upstream. */
853                 if (bond->dev->flags & IFF_PROMISC)
854                         dev_set_promiscuity(new_active->dev, 1);
855
856                 if (bond->dev->flags & IFF_ALLMULTI)
857                         dev_set_allmulti(new_active->dev, 1);
858
859                 netdev_for_each_mc_addr(ha, bond->dev)
860                         dev_mc_add(new_active->dev, ha->addr);
861         }
862 }
863
864 static struct slave *bond_get_old_active(struct bonding *bond,
865                                          struct slave *new_active)
866 {
867         struct slave *slave;
868         int i;
869
870         bond_for_each_slave(bond, slave, i) {
871                 if (slave == new_active)
872                         continue;
873
874                 if (!compare_ether_addr(bond->dev->dev_addr, slave->dev->dev_addr))
875                         return slave;
876         }
877
878         return NULL;
879 }
880
881 /*
882  * bond_do_fail_over_mac
883  *
884  * Perform special MAC address swapping for fail_over_mac settings
885  *
886  * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
887  */
888 static void bond_do_fail_over_mac(struct bonding *bond,
889                                   struct slave *new_active,
890                                   struct slave *old_active)
891         __releases(&bond->curr_slave_lock)
892         __releases(&bond->lock)
893         __acquires(&bond->lock)
894         __acquires(&bond->curr_slave_lock)
895 {
896         u8 tmp_mac[ETH_ALEN];
897         struct sockaddr saddr;
898         int rv;
899
900         switch (bond->params.fail_over_mac) {
901         case BOND_FOM_ACTIVE:
902                 if (new_active)
903                         memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
904                                new_active->dev->addr_len);
905                 break;
906         case BOND_FOM_FOLLOW:
907                 /*
908                  * if new_active && old_active, swap them
909                  * if just old_active, do nothing (going to no active slave)
910                  * if just new_active, set new_active to bond's MAC
911                  */
912                 if (!new_active)
913                         return;
914
915                 write_unlock_bh(&bond->curr_slave_lock);
916                 read_unlock(&bond->lock);
917
918                 if (!old_active)
919                         old_active = bond_get_old_active(bond, new_active);
920
921                 if (old_active) {
922                         memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
923                         memcpy(saddr.sa_data, old_active->dev->dev_addr,
924                                ETH_ALEN);
925                         saddr.sa_family = new_active->dev->type;
926                 } else {
927                         memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
928                         saddr.sa_family = bond->dev->type;
929                 }
930
931                 rv = dev_set_mac_address(new_active->dev, &saddr);
932                 if (rv) {
933                         pr_err("%s: Error %d setting MAC of slave %s\n",
934                                bond->dev->name, -rv, new_active->dev->name);
935                         goto out;
936                 }
937
938                 if (!old_active)
939                         goto out;
940
941                 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
942                 saddr.sa_family = old_active->dev->type;
943
944                 rv = dev_set_mac_address(old_active->dev, &saddr);
945                 if (rv)
946                         pr_err("%s: Error %d setting MAC of slave %s\n",
947                                bond->dev->name, -rv, new_active->dev->name);
948 out:
949                 read_lock(&bond->lock);
950                 write_lock_bh(&bond->curr_slave_lock);
951                 break;
952         default:
953                 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
954                        bond->dev->name, bond->params.fail_over_mac);
955                 break;
956         }
957
958 }
959
960 static bool bond_should_change_active(struct bonding *bond)
961 {
962         struct slave *prim = bond->primary_slave;
963         struct slave *curr = bond->curr_active_slave;
964
965         if (!prim || !curr || curr->link != BOND_LINK_UP)
966                 return true;
967         if (bond->force_primary) {
968                 bond->force_primary = false;
969                 return true;
970         }
971         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
972             (prim->speed < curr->speed ||
973              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
974                 return false;
975         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
976                 return false;
977         return true;
978 }
979
980 /**
981  * find_best_interface - select the best available slave to be the active one
982  * @bond: our bonding struct
983  *
984  * Warning: Caller must hold curr_slave_lock for writing.
985  */
986 static struct slave *bond_find_best_slave(struct bonding *bond)
987 {
988         struct slave *new_active, *old_active;
989         struct slave *bestslave = NULL;
990         int mintime = bond->params.updelay;
991         int i;
992
993         new_active = bond->curr_active_slave;
994
995         if (!new_active) { /* there were no active slaves left */
996                 if (bond->slave_cnt > 0)   /* found one slave */
997                         new_active = bond->first_slave;
998                 else
999                         return NULL; /* still no slave, return NULL */
1000         }
1001
1002         if ((bond->primary_slave) &&
1003             bond->primary_slave->link == BOND_LINK_UP &&
1004             bond_should_change_active(bond)) {
1005                 new_active = bond->primary_slave;
1006         }
1007
1008         /* remember where to stop iterating over the slaves */
1009         old_active = new_active;
1010
1011         bond_for_each_slave_from(bond, new_active, i, old_active) {
1012                 if (new_active->link == BOND_LINK_UP) {
1013                         return new_active;
1014                 } else if (new_active->link == BOND_LINK_BACK &&
1015                            IS_UP(new_active->dev)) {
1016                         /* link up, but waiting for stabilization */
1017                         if (new_active->delay < mintime) {
1018                                 mintime = new_active->delay;
1019                                 bestslave = new_active;
1020                         }
1021                 }
1022         }
1023
1024         return bestslave;
1025 }
1026
1027 static bool bond_should_notify_peers(struct bonding *bond)
1028 {
1029         struct slave *slave = bond->curr_active_slave;
1030
1031         pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1032                  bond->dev->name, slave ? slave->dev->name : "NULL");
1033
1034         if (!slave || !bond->send_peer_notif ||
1035             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1036                 return false;
1037
1038         bond->send_peer_notif--;
1039         return true;
1040 }
1041
1042 /**
1043  * change_active_interface - change the active slave into the specified one
1044  * @bond: our bonding struct
1045  * @new: the new slave to make the active one
1046  *
1047  * Set the new slave to the bond's settings and unset them on the old
1048  * curr_active_slave.
1049  * Setting include flags, mc-list, promiscuity, allmulti, etc.
1050  *
1051  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1052  * because it is apparently the best available slave we have, even though its
1053  * updelay hasn't timed out yet.
1054  *
1055  * If new_active is not NULL, caller must hold bond->lock for read and
1056  * curr_slave_lock for write_bh.
1057  */
1058 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1059 {
1060         struct slave *old_active = bond->curr_active_slave;
1061
1062         if (old_active == new_active)
1063                 return;
1064
1065         if (new_active) {
1066                 new_active->jiffies = jiffies;
1067
1068                 if (new_active->link == BOND_LINK_BACK) {
1069                         if (USES_PRIMARY(bond->params.mode)) {
1070                                 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1071                                         bond->dev->name, new_active->dev->name,
1072                                         (bond->params.updelay - new_active->delay) * bond->params.miimon);
1073                         }
1074
1075                         new_active->delay = 0;
1076                         new_active->link = BOND_LINK_UP;
1077
1078                         if (bond->params.mode == BOND_MODE_8023AD)
1079                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1080
1081                         if (bond_is_lb(bond))
1082                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1083                 } else {
1084                         if (USES_PRIMARY(bond->params.mode)) {
1085                                 pr_info("%s: making interface %s the new active one.\n",
1086                                         bond->dev->name, new_active->dev->name);
1087                         }
1088                 }
1089         }
1090
1091         if (USES_PRIMARY(bond->params.mode))
1092                 bond_mc_swap(bond, new_active, old_active);
1093
1094         if (bond_is_lb(bond)) {
1095                 bond_alb_handle_active_change(bond, new_active);
1096                 if (old_active)
1097                         bond_set_slave_inactive_flags(old_active);
1098                 if (new_active)
1099                         bond_set_slave_active_flags(new_active);
1100         } else {
1101                 bond->curr_active_slave = new_active;
1102         }
1103
1104         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1105                 if (old_active)
1106                         bond_set_slave_inactive_flags(old_active);
1107
1108                 if (new_active) {
1109                         bool should_notify_peers = false;
1110
1111                         bond_set_slave_active_flags(new_active);
1112
1113                         if (bond->params.fail_over_mac)
1114                                 bond_do_fail_over_mac(bond, new_active,
1115                                                       old_active);
1116
1117                         if (netif_running(bond->dev)) {
1118                                 bond->send_peer_notif =
1119                                         bond->params.num_peer_notif;
1120                                 should_notify_peers =
1121                                         bond_should_notify_peers(bond);
1122                         }
1123
1124                         write_unlock_bh(&bond->curr_slave_lock);
1125                         read_unlock(&bond->lock);
1126
1127                         netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1128                         if (should_notify_peers)
1129                                 netdev_bonding_change(bond->dev,
1130                                                       NETDEV_NOTIFY_PEERS);
1131
1132                         read_lock(&bond->lock);
1133                         write_lock_bh(&bond->curr_slave_lock);
1134                 }
1135         }
1136
1137         /* resend IGMP joins since active slave has changed or
1138          * all were sent on curr_active_slave.
1139          * resend only if bond is brought up with the affected
1140          * bonding modes and the retransmission is enabled */
1141         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1142             ((USES_PRIMARY(bond->params.mode) && new_active) ||
1143              bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1144                 bond->igmp_retrans = bond->params.resend_igmp;
1145                 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1146         }
1147 }
1148
1149 /**
1150  * bond_select_active_slave - select a new active slave, if needed
1151  * @bond: our bonding struct
1152  *
1153  * This functions should be called when one of the following occurs:
1154  * - The old curr_active_slave has been released or lost its link.
1155  * - The primary_slave has got its link back.
1156  * - A slave has got its link back and there's no old curr_active_slave.
1157  *
1158  * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1159  */
1160 void bond_select_active_slave(struct bonding *bond)
1161 {
1162         struct slave *best_slave;
1163         int rv;
1164
1165         best_slave = bond_find_best_slave(bond);
1166         if (best_slave != bond->curr_active_slave) {
1167                 bond_change_active_slave(bond, best_slave);
1168                 rv = bond_set_carrier(bond);
1169                 if (!rv)
1170                         return;
1171
1172                 if (netif_carrier_ok(bond->dev)) {
1173                         pr_info("%s: first active interface up!\n",
1174                                 bond->dev->name);
1175                 } else {
1176                         pr_info("%s: now running without any active interface !\n",
1177                                 bond->dev->name);
1178                 }
1179         }
1180 }
1181
1182 /*--------------------------- slave list handling ---------------------------*/
1183
1184 /*
1185  * This function attaches the slave to the end of list.
1186  *
1187  * bond->lock held for writing by caller.
1188  */
1189 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1190 {
1191         if (bond->first_slave == NULL) { /* attaching the first slave */
1192                 new_slave->next = new_slave;
1193                 new_slave->prev = new_slave;
1194                 bond->first_slave = new_slave;
1195         } else {
1196                 new_slave->next = bond->first_slave;
1197                 new_slave->prev = bond->first_slave->prev;
1198                 new_slave->next->prev = new_slave;
1199                 new_slave->prev->next = new_slave;
1200         }
1201
1202         bond->slave_cnt++;
1203 }
1204
1205 /*
1206  * This function detaches the slave from the list.
1207  * WARNING: no check is made to verify if the slave effectively
1208  * belongs to <bond>.
1209  * Nothing is freed on return, structures are just unchained.
1210  * If any slave pointer in bond was pointing to <slave>,
1211  * it should be changed by the calling function.
1212  *
1213  * bond->lock held for writing by caller.
1214  */
1215 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1216 {
1217         if (slave->next)
1218                 slave->next->prev = slave->prev;
1219
1220         if (slave->prev)
1221                 slave->prev->next = slave->next;
1222
1223         if (bond->first_slave == slave) { /* slave is the first slave */
1224                 if (bond->slave_cnt > 1) { /* there are more slave */
1225                         bond->first_slave = slave->next;
1226                 } else {
1227                         bond->first_slave = NULL; /* slave was the last one */
1228                 }
1229         }
1230
1231         slave->next = NULL;
1232         slave->prev = NULL;
1233         bond->slave_cnt--;
1234 }
1235
1236 #ifdef CONFIG_NET_POLL_CONTROLLER
1237 static inline int slave_enable_netpoll(struct slave *slave)
1238 {
1239         struct netpoll *np;
1240         int err = 0;
1241
1242         np = kzalloc(sizeof(*np), GFP_KERNEL);
1243         err = -ENOMEM;
1244         if (!np)
1245                 goto out;
1246
1247         np->dev = slave->dev;
1248         strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1249         err = __netpoll_setup(np);
1250         if (err) {
1251                 kfree(np);
1252                 goto out;
1253         }
1254         slave->np = np;
1255 out:
1256         return err;
1257 }
1258 static inline void slave_disable_netpoll(struct slave *slave)
1259 {
1260         struct netpoll *np = slave->np;
1261
1262         if (!np)
1263                 return;
1264
1265         slave->np = NULL;
1266         synchronize_rcu_bh();
1267         __netpoll_cleanup(np);
1268         kfree(np);
1269 }
1270 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1271 {
1272         if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1273                 return false;
1274         if (!slave_dev->netdev_ops->ndo_poll_controller)
1275                 return false;
1276         return true;
1277 }
1278
1279 static void bond_poll_controller(struct net_device *bond_dev)
1280 {
1281 }
1282
1283 static void __bond_netpoll_cleanup(struct bonding *bond)
1284 {
1285         struct slave *slave;
1286         int i;
1287
1288         bond_for_each_slave(bond, slave, i)
1289                 if (IS_UP(slave->dev))
1290                         slave_disable_netpoll(slave);
1291 }
1292 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1293 {
1294         struct bonding *bond = netdev_priv(bond_dev);
1295
1296         read_lock(&bond->lock);
1297         __bond_netpoll_cleanup(bond);
1298         read_unlock(&bond->lock);
1299 }
1300
1301 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1302 {
1303         struct bonding *bond = netdev_priv(dev);
1304         struct slave *slave;
1305         int i, err = 0;
1306
1307         read_lock(&bond->lock);
1308         bond_for_each_slave(bond, slave, i) {
1309                 err = slave_enable_netpoll(slave);
1310                 if (err) {
1311                         __bond_netpoll_cleanup(bond);
1312                         break;
1313                 }
1314         }
1315         read_unlock(&bond->lock);
1316         return err;
1317 }
1318
1319 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1320 {
1321         return bond->dev->npinfo;
1322 }
1323
1324 #else
1325 static inline int slave_enable_netpoll(struct slave *slave)
1326 {
1327         return 0;
1328 }
1329 static inline void slave_disable_netpoll(struct slave *slave)
1330 {
1331 }
1332 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1333 {
1334 }
1335 #endif
1336
1337 /*---------------------------------- IOCTL ----------------------------------*/
1338
1339 static int bond_sethwaddr(struct net_device *bond_dev,
1340                           struct net_device *slave_dev)
1341 {
1342         pr_debug("bond_dev=%p\n", bond_dev);
1343         pr_debug("slave_dev=%p\n", slave_dev);
1344         pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1345         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1346         return 0;
1347 }
1348
1349 static u32 bond_fix_features(struct net_device *dev, u32 features)
1350 {
1351         struct slave *slave;
1352         struct bonding *bond = netdev_priv(dev);
1353         u32 mask;
1354         int i;
1355
1356         read_lock(&bond->lock);
1357
1358         if (!bond->first_slave) {
1359                 /* Disable adding VLANs to empty bond. But why? --mq */
1360                 features |= NETIF_F_VLAN_CHALLENGED;
1361                 goto out;
1362         }
1363
1364         mask = features;
1365         features &= ~NETIF_F_ONE_FOR_ALL;
1366         features |= NETIF_F_ALL_FOR_ALL;
1367
1368         bond_for_each_slave(bond, slave, i) {
1369                 features = netdev_increment_features(features,
1370                                                      slave->dev->features,
1371                                                      mask);
1372         }
1373
1374 out:
1375         read_unlock(&bond->lock);
1376         return features;
1377 }
1378
1379 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1380                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1381                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1382
1383 static void bond_compute_features(struct bonding *bond)
1384 {
1385         struct slave *slave;
1386         struct net_device *bond_dev = bond->dev;
1387         u32 vlan_features = BOND_VLAN_FEATURES;
1388         unsigned short max_hard_header_len = ETH_HLEN;
1389         unsigned int gso_max_size = GSO_MAX_SIZE;
1390         u16 gso_max_segs = GSO_MAX_SEGS;
1391         int i;
1392
1393         read_lock(&bond->lock);
1394
1395         if (!bond->first_slave)
1396                 goto done;
1397
1398         bond_for_each_slave(bond, slave, i) {
1399                 vlan_features = netdev_increment_features(vlan_features,
1400                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1401
1402                 if (slave->dev->hard_header_len > max_hard_header_len)
1403                         max_hard_header_len = slave->dev->hard_header_len;
1404
1405                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1406                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1407         }
1408
1409 done:
1410         bond_dev->vlan_features = vlan_features;
1411         bond_dev->hard_header_len = max_hard_header_len;
1412         bond_dev->gso_max_segs = gso_max_segs;
1413         netif_set_gso_max_size(bond_dev, gso_max_size);
1414
1415         read_unlock(&bond->lock);
1416
1417         netdev_change_features(bond_dev);
1418 }
1419
1420 static void bond_setup_by_slave(struct net_device *bond_dev,
1421                                 struct net_device *slave_dev)
1422 {
1423         struct bonding *bond = netdev_priv(bond_dev);
1424
1425         bond_dev->header_ops        = slave_dev->header_ops;
1426
1427         bond_dev->type              = slave_dev->type;
1428         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1429         bond_dev->addr_len          = slave_dev->addr_len;
1430
1431         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1432                 slave_dev->addr_len);
1433         bond->setup_by_slave = 1;
1434 }
1435
1436 /* On bonding slaves other than the currently active slave, suppress
1437  * duplicates except for alb non-mcast/bcast.
1438  */
1439 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1440                                             struct slave *slave,
1441                                             struct bonding *bond)
1442 {
1443         if (bond_is_slave_inactive(slave)) {
1444                 if (bond->params.mode == BOND_MODE_ALB &&
1445                     skb->pkt_type != PACKET_BROADCAST &&
1446                     skb->pkt_type != PACKET_MULTICAST)
1447                         return false;
1448                 return true;
1449         }
1450         return false;
1451 }
1452
1453 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1454 {
1455         struct sk_buff *skb = *pskb;
1456         struct slave *slave;
1457         struct bonding *bond;
1458         void (*recv_probe)(struct sk_buff *, struct bonding *,
1459                                 struct slave *);
1460
1461         skb = skb_share_check(skb, GFP_ATOMIC);
1462         if (unlikely(!skb))
1463                 return RX_HANDLER_CONSUMED;
1464
1465         *pskb = skb;
1466
1467         slave = bond_slave_get_rcu(skb->dev);
1468         bond = slave->bond;
1469
1470         if (bond->params.arp_interval)
1471                 slave->dev->last_rx = jiffies;
1472
1473         recv_probe = ACCESS_ONCE(bond->recv_probe);
1474         if (recv_probe) {
1475                 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1476
1477                 if (likely(nskb)) {
1478                         recv_probe(nskb, bond, slave);
1479                         dev_kfree_skb(nskb);
1480                 }
1481         }
1482
1483         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1484                 return RX_HANDLER_EXACT;
1485         }
1486
1487         skb->dev = bond->dev;
1488
1489         if (bond->params.mode == BOND_MODE_ALB &&
1490             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1491             skb->pkt_type == PACKET_HOST) {
1492
1493                 if (unlikely(skb_cow_head(skb,
1494                                           skb->data - skb_mac_header(skb)))) {
1495                         kfree_skb(skb);
1496                         return RX_HANDLER_CONSUMED;
1497                 }
1498                 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1499         }
1500
1501         return RX_HANDLER_ANOTHER;
1502 }
1503
1504 /* enslave device <slave> to bond device <master> */
1505 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1506 {
1507         struct bonding *bond = netdev_priv(bond_dev);
1508         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1509         struct slave *new_slave = NULL;
1510         struct netdev_hw_addr *ha;
1511         struct sockaddr addr;
1512         int link_reporting;
1513         int res = 0;
1514
1515         if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1516                 slave_ops->ndo_do_ioctl == NULL) {
1517                 pr_warning("%s: Warning: no link monitoring support for %s\n",
1518                            bond_dev->name, slave_dev->name);
1519         }
1520
1521         /* already enslaved */
1522         if (slave_dev->flags & IFF_SLAVE) {
1523                 pr_debug("Error, Device was already enslaved\n");
1524                 return -EBUSY;
1525         }
1526
1527         /* vlan challenged mutual exclusion */
1528         /* no need to lock since we're protected by rtnl_lock */
1529         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1530                 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1531                 if (bond_vlan_used(bond)) {
1532                         pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1533                                bond_dev->name, slave_dev->name, bond_dev->name);
1534                         return -EPERM;
1535                 } else {
1536                         pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1537                                    bond_dev->name, slave_dev->name,
1538                                    slave_dev->name, bond_dev->name);
1539                 }
1540         } else {
1541                 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1542         }
1543
1544         /*
1545          * Old ifenslave binaries are no longer supported.  These can
1546          * be identified with moderate accuracy by the state of the slave:
1547          * the current ifenslave will set the interface down prior to
1548          * enslaving it; the old ifenslave will not.
1549          */
1550         if ((slave_dev->flags & IFF_UP)) {
1551                 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1552                        slave_dev->name);
1553                 res = -EPERM;
1554                 goto err_undo_flags;
1555         }
1556
1557         /* set bonding device ether type by slave - bonding netdevices are
1558          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1559          * there is a need to override some of the type dependent attribs/funcs.
1560          *
1561          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1562          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1563          */
1564         if (bond->slave_cnt == 0) {
1565                 if (bond_dev->type != slave_dev->type) {
1566                         pr_debug("%s: change device type from %d to %d\n",
1567                                  bond_dev->name,
1568                                  bond_dev->type, slave_dev->type);
1569
1570                         res = netdev_bonding_change(bond_dev,
1571                                                     NETDEV_PRE_TYPE_CHANGE);
1572                         res = notifier_to_errno(res);
1573                         if (res) {
1574                                 pr_err("%s: refused to change device type\n",
1575                                        bond_dev->name);
1576                                 res = -EBUSY;
1577                                 goto err_undo_flags;
1578                         }
1579
1580                         /* Flush unicast and multicast addresses */
1581                         dev_uc_flush(bond_dev);
1582                         dev_mc_flush(bond_dev);
1583
1584                         if (slave_dev->type != ARPHRD_ETHER)
1585                                 bond_setup_by_slave(bond_dev, slave_dev);
1586                         else {
1587                                 ether_setup(bond_dev);
1588                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1589                         }
1590
1591                         netdev_bonding_change(bond_dev,
1592                                               NETDEV_POST_TYPE_CHANGE);
1593                 }
1594         } else if (bond_dev->type != slave_dev->type) {
1595                 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1596                        slave_dev->name,
1597                        slave_dev->type, bond_dev->type);
1598                 res = -EINVAL;
1599                 goto err_undo_flags;
1600         }
1601
1602         if (slave_ops->ndo_set_mac_address == NULL) {
1603                 if (bond->slave_cnt == 0) {
1604                         pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1605                                    bond_dev->name);
1606                         bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1607                 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1608                         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",
1609                                bond_dev->name);
1610                         res = -EOPNOTSUPP;
1611                         goto err_undo_flags;
1612                 }
1613         }
1614
1615         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1616
1617         /* If this is the first slave, then we need to set the master's hardware
1618          * address to be the same as the slave's. */
1619         if (is_zero_ether_addr(bond->dev->dev_addr))
1620                 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1621                        slave_dev->addr_len);
1622
1623
1624         new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1625         if (!new_slave) {
1626                 res = -ENOMEM;
1627                 goto err_undo_flags;
1628         }
1629
1630         /*
1631          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1632          * is set via sysfs or module option if desired.
1633          */
1634         new_slave->queue_id = 0;
1635
1636         /* Save slave's original mtu and then set it to match the bond */
1637         new_slave->original_mtu = slave_dev->mtu;
1638         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1639         if (res) {
1640                 pr_debug("Error %d calling dev_set_mtu\n", res);
1641                 goto err_free;
1642         }
1643
1644         /*
1645          * Save slave's original ("permanent") mac address for modes
1646          * that need it, and for restoring it upon release, and then
1647          * set it to the master's address
1648          */
1649         memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1650
1651         if (!bond->params.fail_over_mac) {
1652                 /*
1653                  * Set slave to master's mac address.  The application already
1654                  * set the master's mac address to that of the first slave
1655                  */
1656                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1657                 addr.sa_family = slave_dev->type;
1658                 res = dev_set_mac_address(slave_dev, &addr);
1659                 if (res) {
1660                         pr_debug("Error %d calling set_mac_address\n", res);
1661                         goto err_restore_mtu;
1662                 }
1663         }
1664
1665         res = netdev_set_bond_master(slave_dev, bond_dev);
1666         if (res) {
1667                 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1668                 goto err_restore_mac;
1669         }
1670
1671         /* open the slave since the application closed it */
1672         res = dev_open(slave_dev);
1673         if (res) {
1674                 pr_debug("Opening slave %s failed\n", slave_dev->name);
1675                 goto err_unset_master;
1676         }
1677
1678         new_slave->bond = bond;
1679         new_slave->dev = slave_dev;
1680         slave_dev->priv_flags |= IFF_BONDING;
1681
1682         if (bond_is_lb(bond)) {
1683                 /* bond_alb_init_slave() must be called before all other stages since
1684                  * it might fail and we do not want to have to undo everything
1685                  */
1686                 res = bond_alb_init_slave(bond, new_slave);
1687                 if (res)
1688                         goto err_close;
1689         }
1690
1691         /* If the mode USES_PRIMARY, then the new slave gets the
1692          * master's promisc (and mc) settings only if it becomes the
1693          * curr_active_slave, and that is taken care of later when calling
1694          * bond_change_active()
1695          */
1696         if (!USES_PRIMARY(bond->params.mode)) {
1697                 /* set promiscuity level to new slave */
1698                 if (bond_dev->flags & IFF_PROMISC) {
1699                         res = dev_set_promiscuity(slave_dev, 1);
1700                         if (res)
1701                                 goto err_close;
1702                 }
1703
1704                 /* set allmulti level to new slave */
1705                 if (bond_dev->flags & IFF_ALLMULTI) {
1706                         res = dev_set_allmulti(slave_dev, 1);
1707                         if (res) {
1708                                 if (bond_dev->flags & IFF_PROMISC)
1709                                         dev_set_promiscuity(slave_dev, -1);
1710                                 goto err_close;
1711                         }
1712                 }
1713
1714                 netif_addr_lock_bh(bond_dev);
1715                 /* upload master's mc_list to new slave */
1716                 netdev_for_each_mc_addr(ha, bond_dev)
1717                         dev_mc_add(slave_dev, ha->addr);
1718                 netif_addr_unlock_bh(bond_dev);
1719         }
1720
1721         if (bond->params.mode == BOND_MODE_8023AD) {
1722                 /* add lacpdu mc addr to mc list */
1723                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1724
1725                 dev_mc_add(slave_dev, lacpdu_multicast);
1726         }
1727
1728         bond_add_vlans_on_slave(bond, slave_dev);
1729
1730         write_lock_bh(&bond->lock);
1731
1732         bond_attach_slave(bond, new_slave);
1733
1734         new_slave->delay = 0;
1735         new_slave->link_failure_count = 0;
1736
1737         write_unlock_bh(&bond->lock);
1738
1739         bond_compute_features(bond);
1740
1741         bond_update_speed_duplex(new_slave);
1742
1743         read_lock(&bond->lock);
1744
1745         new_slave->last_arp_rx = jiffies;
1746
1747         if (bond->params.miimon && !bond->params.use_carrier) {
1748                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1749
1750                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1751                         /*
1752                          * miimon is set but a bonded network driver
1753                          * does not support ETHTOOL/MII and
1754                          * arp_interval is not set.  Note: if
1755                          * use_carrier is enabled, we will never go
1756                          * here (because netif_carrier is always
1757                          * supported); thus, we don't need to change
1758                          * the messages for netif_carrier.
1759                          */
1760                         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",
1761                                bond_dev->name, slave_dev->name);
1762                 } else if (link_reporting == -1) {
1763                         /* unable get link status using mii/ethtool */
1764                         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",
1765                                    bond_dev->name, slave_dev->name);
1766                 }
1767         }
1768
1769         /* check for initial state */
1770         if (!bond->params.miimon ||
1771             (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1772                 if (bond->params.updelay) {
1773                         pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1774                         new_slave->link  = BOND_LINK_BACK;
1775                         new_slave->delay = bond->params.updelay;
1776                 } else {
1777                         pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1778                         new_slave->link  = BOND_LINK_UP;
1779                 }
1780                 new_slave->jiffies = jiffies;
1781         } else {
1782                 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1783                 new_slave->link  = BOND_LINK_DOWN;
1784         }
1785
1786         if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1787                 /* if there is a primary slave, remember it */
1788                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1789                         bond->primary_slave = new_slave;
1790                         bond->force_primary = true;
1791                 }
1792         }
1793
1794         write_lock_bh(&bond->curr_slave_lock);
1795
1796         switch (bond->params.mode) {
1797         case BOND_MODE_ACTIVEBACKUP:
1798                 bond_set_slave_inactive_flags(new_slave);
1799                 bond_select_active_slave(bond);
1800                 break;
1801         case BOND_MODE_8023AD:
1802                 /* in 802.3ad mode, the internal mechanism
1803                  * will activate the slaves in the selected
1804                  * aggregator
1805                  */
1806                 bond_set_slave_inactive_flags(new_slave);
1807                 /* if this is the first slave */
1808                 if (bond->slave_cnt == 1) {
1809                         SLAVE_AD_INFO(new_slave).id = 1;
1810                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1811                          * can be called only after the mac address of the bond is set
1812                          */
1813                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1814                 } else {
1815                         SLAVE_AD_INFO(new_slave).id =
1816                                 SLAVE_AD_INFO(new_slave->prev).id + 1;
1817                 }
1818
1819                 bond_3ad_bind_slave(new_slave);
1820                 break;
1821         case BOND_MODE_TLB:
1822         case BOND_MODE_ALB:
1823                 bond_set_active_slave(new_slave);
1824                 bond_set_slave_inactive_flags(new_slave);
1825                 bond_select_active_slave(bond);
1826                 break;
1827         default:
1828                 pr_debug("This slave is always active in trunk mode\n");
1829
1830                 /* always active in trunk mode */
1831                 bond_set_active_slave(new_slave);
1832
1833                 /* In trunking mode there is little meaning to curr_active_slave
1834                  * anyway (it holds no special properties of the bond device),
1835                  * so we can change it without calling change_active_interface()
1836                  */
1837                 if (!bond->curr_active_slave)
1838                         bond->curr_active_slave = new_slave;
1839
1840                 break;
1841         } /* switch(bond_mode) */
1842
1843         write_unlock_bh(&bond->curr_slave_lock);
1844
1845         bond_set_carrier(bond);
1846
1847 #ifdef CONFIG_NET_POLL_CONTROLLER
1848         slave_dev->npinfo = bond_netpoll_info(bond);
1849         if (slave_dev->npinfo) {
1850                 if (slave_enable_netpoll(new_slave)) {
1851                         read_unlock(&bond->lock);
1852                         pr_info("Error, %s: master_dev is using netpoll, "
1853                                  "but new slave device does not support netpoll.\n",
1854                                  bond_dev->name);
1855                         res = -EBUSY;
1856                         goto err_detach;
1857                 }
1858         }
1859 #endif
1860
1861         read_unlock(&bond->lock);
1862
1863         res = bond_create_slave_symlinks(bond_dev, slave_dev);
1864         if (res)
1865                 goto err_detach;
1866
1867         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1868                                          new_slave);
1869         if (res) {
1870                 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1871                 goto err_dest_symlinks;
1872         }
1873
1874         pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1875                 bond_dev->name, slave_dev->name,
1876                 bond_is_active_slave(new_slave) ? "n active" : " backup",
1877                 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1878
1879         /* enslave is successful */
1880         return 0;
1881
1882 /* Undo stages on error */
1883 err_dest_symlinks:
1884         bond_destroy_slave_symlinks(bond_dev, slave_dev);
1885
1886 err_detach:
1887         write_lock_bh(&bond->lock);
1888         bond_detach_slave(bond, new_slave);
1889         write_unlock_bh(&bond->lock);
1890
1891 err_close:
1892         slave_dev->priv_flags &= ~IFF_BONDING;
1893         dev_close(slave_dev);
1894
1895 err_unset_master:
1896         netdev_set_bond_master(slave_dev, NULL);
1897
1898 err_restore_mac:
1899         if (!bond->params.fail_over_mac) {
1900                 /* XXX TODO - fom follow mode needs to change master's
1901                  * MAC if this slave's MAC is in use by the bond, or at
1902                  * least print a warning.
1903                  */
1904                 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1905                 addr.sa_family = slave_dev->type;
1906                 dev_set_mac_address(slave_dev, &addr);
1907         }
1908
1909 err_restore_mtu:
1910         dev_set_mtu(slave_dev, new_slave->original_mtu);
1911
1912 err_free:
1913         kfree(new_slave);
1914
1915 err_undo_flags:
1916         bond_compute_features(bond);
1917
1918         return res;
1919 }
1920
1921 /*
1922  * Try to release the slave device <slave> from the bond device <master>
1923  * It is legal to access curr_active_slave without a lock because all the function
1924  * is write-locked.
1925  *
1926  * The rules for slave state should be:
1927  *   for Active/Backup:
1928  *     Active stays on all backups go down
1929  *   for Bonded connections:
1930  *     The first up interface should be left on and all others downed.
1931  */
1932 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1933 {
1934         struct bonding *bond = netdev_priv(bond_dev);
1935         struct slave *slave, *oldcurrent;
1936         struct sockaddr addr;
1937         int old_flags = bond_dev->flags;
1938         u32 old_features = bond_dev->features;
1939
1940         /* slave is not a slave or master is not master of this slave */
1941         if (!(slave_dev->flags & IFF_SLAVE) ||
1942             (slave_dev->master != bond_dev)) {
1943                 pr_err("%s: Error: cannot release %s.\n",
1944                        bond_dev->name, slave_dev->name);
1945                 return -EINVAL;
1946         }
1947
1948         block_netpoll_tx();
1949         netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1950         write_lock_bh(&bond->lock);
1951
1952         slave = bond_get_slave_by_dev(bond, slave_dev);
1953         if (!slave) {
1954                 /* not a slave of this bond */
1955                 pr_info("%s: %s not enslaved\n",
1956                         bond_dev->name, slave_dev->name);
1957                 write_unlock_bh(&bond->lock);
1958                 unblock_netpoll_tx();
1959                 return -EINVAL;
1960         }
1961
1962         write_unlock_bh(&bond->lock);
1963         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1964          * for this slave anymore.
1965          */
1966         netdev_rx_handler_unregister(slave_dev);
1967         write_lock_bh(&bond->lock);
1968
1969         if (!bond->params.fail_over_mac) {
1970                 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1971                     bond->slave_cnt > 1)
1972                         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",
1973                                    bond_dev->name, slave_dev->name,
1974                                    slave->perm_hwaddr,
1975                                    bond_dev->name, slave_dev->name);
1976         }
1977
1978         /* Inform AD package of unbinding of slave. */
1979         if (bond->params.mode == BOND_MODE_8023AD) {
1980                 /* must be called before the slave is
1981                  * detached from the list
1982                  */
1983                 bond_3ad_unbind_slave(slave);
1984         }
1985
1986         pr_info("%s: releasing %s interface %s\n",
1987                 bond_dev->name,
1988                 bond_is_active_slave(slave) ? "active" : "backup",
1989                 slave_dev->name);
1990
1991         oldcurrent = bond->curr_active_slave;
1992
1993         bond->current_arp_slave = NULL;
1994
1995         /* release the slave from its bond */
1996         bond_detach_slave(bond, slave);
1997
1998         if (bond->primary_slave == slave)
1999                 bond->primary_slave = NULL;
2000
2001         if (oldcurrent == slave)
2002                 bond_change_active_slave(bond, NULL);
2003
2004         if (bond_is_lb(bond)) {
2005                 /* Must be called only after the slave has been
2006                  * detached from the list and the curr_active_slave
2007                  * has been cleared (if our_slave == old_current),
2008                  * but before a new active slave is selected.
2009                  */
2010                 write_unlock_bh(&bond->lock);
2011                 bond_alb_deinit_slave(bond, slave);
2012                 write_lock_bh(&bond->lock);
2013         }
2014
2015         if (oldcurrent == slave) {
2016                 /*
2017                  * Note that we hold RTNL over this sequence, so there
2018                  * is no concern that another slave add/remove event
2019                  * will interfere.
2020                  */
2021                 write_unlock_bh(&bond->lock);
2022                 read_lock(&bond->lock);
2023                 write_lock_bh(&bond->curr_slave_lock);
2024
2025                 bond_select_active_slave(bond);
2026
2027                 write_unlock_bh(&bond->curr_slave_lock);
2028                 read_unlock(&bond->lock);
2029                 write_lock_bh(&bond->lock);
2030         }
2031
2032         if (bond->slave_cnt == 0) {
2033                 bond_set_carrier(bond);
2034
2035                 /* if the last slave was removed, zero the mac address
2036                  * of the master so it will be set by the application
2037                  * to the mac address of the first slave
2038                  */
2039                 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2040
2041                 if (bond_vlan_used(bond)) {
2042                         pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2043                                    bond_dev->name, bond_dev->name);
2044                         pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2045                                    bond_dev->name);
2046                 }
2047         }
2048
2049         write_unlock_bh(&bond->lock);
2050         unblock_netpoll_tx();
2051
2052         bond_compute_features(bond);
2053         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2054             (old_features & NETIF_F_VLAN_CHALLENGED))
2055                 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2056                         bond_dev->name, slave_dev->name, bond_dev->name);
2057
2058         /* must do this from outside any spinlocks */
2059         bond_destroy_slave_symlinks(bond_dev, slave_dev);
2060
2061         bond_del_vlans_from_slave(bond, slave_dev);
2062
2063         /* If the mode USES_PRIMARY, then we should only remove its
2064          * promisc and mc settings if it was the curr_active_slave, but that was
2065          * already taken care of above when we detached the slave
2066          */
2067         if (!USES_PRIMARY(bond->params.mode)) {
2068                 /* unset promiscuity level from slave
2069                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
2070                  * of the IFF_PROMISC flag in the bond_dev, but we need the
2071                  * value of that flag before that change, as that was the value
2072                  * when this slave was attached, so we cache at the start of the
2073                  * function and use it here. Same goes for ALLMULTI below
2074                  */
2075                 if (old_flags & IFF_PROMISC)
2076                         dev_set_promiscuity(slave_dev, -1);
2077
2078                 /* unset allmulti level from slave */
2079                 if (old_flags & IFF_ALLMULTI)
2080                         dev_set_allmulti(slave_dev, -1);
2081
2082                 /* flush master's mc_list from slave */
2083                 netif_addr_lock_bh(bond_dev);
2084                 bond_mc_list_flush(bond_dev, slave_dev);
2085                 netif_addr_unlock_bh(bond_dev);
2086         }
2087
2088         netdev_set_bond_master(slave_dev, NULL);
2089
2090         slave_disable_netpoll(slave);
2091
2092         /* close slave before restoring its mac address */
2093         dev_close(slave_dev);
2094
2095         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2096                 /* restore original ("permanent") mac address */
2097                 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2098                 addr.sa_family = slave_dev->type;
2099                 dev_set_mac_address(slave_dev, &addr);
2100         }
2101
2102         dev_set_mtu(slave_dev, slave->original_mtu);
2103
2104         slave_dev->priv_flags &= ~IFF_BONDING;
2105
2106         kfree(slave);
2107
2108         return 0;  /* deletion OK */
2109 }
2110
2111 /*
2112 * First release a slave and then destroy the bond if no more slaves are left.
2113 * Must be under rtnl_lock when this function is called.
2114 */
2115 static int  bond_release_and_destroy(struct net_device *bond_dev,
2116                                      struct net_device *slave_dev)
2117 {
2118         struct bonding *bond = netdev_priv(bond_dev);
2119         int ret;
2120
2121         ret = bond_release(bond_dev, slave_dev);
2122         if ((ret == 0) && (bond->slave_cnt == 0)) {
2123                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2124                 pr_info("%s: destroying bond %s.\n",
2125                         bond_dev->name, bond_dev->name);
2126                 unregister_netdevice(bond_dev);
2127         }
2128         return ret;
2129 }
2130
2131 /*
2132  * This function releases all slaves.
2133  */
2134 static int bond_release_all(struct net_device *bond_dev)
2135 {
2136         struct bonding *bond = netdev_priv(bond_dev);
2137         struct slave *slave;
2138         struct net_device *slave_dev;
2139         struct sockaddr addr;
2140
2141         write_lock_bh(&bond->lock);
2142
2143         netif_carrier_off(bond_dev);
2144
2145         if (bond->slave_cnt == 0)
2146                 goto out;
2147
2148         bond->current_arp_slave = NULL;
2149         bond->primary_slave = NULL;
2150         bond_change_active_slave(bond, NULL);
2151
2152         while ((slave = bond->first_slave) != NULL) {
2153                 /* Inform AD package of unbinding of slave
2154                  * before slave is detached from the list.
2155                  */
2156                 if (bond->params.mode == BOND_MODE_8023AD)
2157                         bond_3ad_unbind_slave(slave);
2158
2159                 slave_dev = slave->dev;
2160                 bond_detach_slave(bond, slave);
2161
2162                 /* now that the slave is detached, unlock and perform
2163                  * all the undo steps that should not be called from
2164                  * within a lock.
2165                  */
2166                 write_unlock_bh(&bond->lock);
2167
2168                 /* unregister rx_handler early so bond_handle_frame wouldn't
2169                  * be called for this slave anymore.
2170                  */
2171                 netdev_rx_handler_unregister(slave_dev);
2172                 synchronize_net();
2173
2174                 if (bond_is_lb(bond)) {
2175                         /* must be called only after the slave
2176                          * has been detached from the list
2177                          */
2178                         bond_alb_deinit_slave(bond, slave);
2179                 }
2180
2181                 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2182                 bond_del_vlans_from_slave(bond, slave_dev);
2183
2184                 /* If the mode USES_PRIMARY, then we should only remove its
2185                  * promisc and mc settings if it was the curr_active_slave, but that was
2186                  * already taken care of above when we detached the slave
2187                  */
2188                 if (!USES_PRIMARY(bond->params.mode)) {
2189                         /* unset promiscuity level from slave */
2190                         if (bond_dev->flags & IFF_PROMISC)
2191                                 dev_set_promiscuity(slave_dev, -1);
2192
2193                         /* unset allmulti level from slave */
2194                         if (bond_dev->flags & IFF_ALLMULTI)
2195                                 dev_set_allmulti(slave_dev, -1);
2196
2197                         /* flush master's mc_list from slave */
2198                         netif_addr_lock_bh(bond_dev);
2199                         bond_mc_list_flush(bond_dev, slave_dev);
2200                         netif_addr_unlock_bh(bond_dev);
2201                 }
2202
2203                 netdev_set_bond_master(slave_dev, NULL);
2204
2205                 slave_disable_netpoll(slave);
2206
2207                 /* close slave before restoring its mac address */
2208                 dev_close(slave_dev);
2209
2210                 if (!bond->params.fail_over_mac) {
2211                         /* restore original ("permanent") mac address*/
2212                         memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2213                         addr.sa_family = slave_dev->type;
2214                         dev_set_mac_address(slave_dev, &addr);
2215                 }
2216
2217                 kfree(slave);
2218
2219                 /* re-acquire the lock before getting the next slave */
2220                 write_lock_bh(&bond->lock);
2221         }
2222
2223         /* zero the mac address of the master so it will be
2224          * set by the application to the mac address of the
2225          * first slave
2226          */
2227         memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2228
2229         if (bond_vlan_used(bond)) {
2230                 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2231                            bond_dev->name, bond_dev->name);
2232                 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2233                            bond_dev->name);
2234         }
2235
2236         pr_info("%s: released all slaves\n", bond_dev->name);
2237
2238 out:
2239         write_unlock_bh(&bond->lock);
2240
2241         bond_compute_features(bond);
2242
2243         return 0;
2244 }
2245
2246 /*
2247  * This function changes the active slave to slave <slave_dev>.
2248  * It returns -EINVAL in the following cases.
2249  *  - <slave_dev> is not found in the list.
2250  *  - There is not active slave now.
2251  *  - <slave_dev> is already active.
2252  *  - The link state of <slave_dev> is not BOND_LINK_UP.
2253  *  - <slave_dev> is not running.
2254  * In these cases, this function does nothing.
2255  * In the other cases, current_slave pointer is changed and 0 is returned.
2256  */
2257 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2258 {
2259         struct bonding *bond = netdev_priv(bond_dev);
2260         struct slave *old_active = NULL;
2261         struct slave *new_active = NULL;
2262         int res = 0;
2263
2264         if (!USES_PRIMARY(bond->params.mode))
2265                 return -EINVAL;
2266
2267         /* Verify that master_dev is indeed the master of slave_dev */
2268         if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2269                 return -EINVAL;
2270
2271         read_lock(&bond->lock);
2272
2273         read_lock(&bond->curr_slave_lock);
2274         old_active = bond->curr_active_slave;
2275         read_unlock(&bond->curr_slave_lock);
2276
2277         new_active = bond_get_slave_by_dev(bond, slave_dev);
2278
2279         /*
2280          * Changing to the current active: do nothing; return success.
2281          */
2282         if (new_active && (new_active == old_active)) {
2283                 read_unlock(&bond->lock);
2284                 return 0;
2285         }
2286
2287         if ((new_active) &&
2288             (old_active) &&
2289             (new_active->link == BOND_LINK_UP) &&
2290             IS_UP(new_active->dev)) {
2291                 block_netpoll_tx();
2292                 write_lock_bh(&bond->curr_slave_lock);
2293                 bond_change_active_slave(bond, new_active);
2294                 write_unlock_bh(&bond->curr_slave_lock);
2295                 unblock_netpoll_tx();
2296         } else
2297                 res = -EINVAL;
2298
2299         read_unlock(&bond->lock);
2300
2301         return res;
2302 }
2303
2304 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2305 {
2306         struct bonding *bond = netdev_priv(bond_dev);
2307
2308         info->bond_mode = bond->params.mode;
2309         info->miimon = bond->params.miimon;
2310
2311         read_lock(&bond->lock);
2312         info->num_slaves = bond->slave_cnt;
2313         read_unlock(&bond->lock);
2314
2315         return 0;
2316 }
2317
2318 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2319 {
2320         struct bonding *bond = netdev_priv(bond_dev);
2321         struct slave *slave;
2322         int i, res = -ENODEV;
2323
2324         read_lock(&bond->lock);
2325
2326         bond_for_each_slave(bond, slave, i) {
2327                 if (i == (int)info->slave_id) {
2328                         res = 0;
2329                         strcpy(info->slave_name, slave->dev->name);
2330                         info->link = slave->link;
2331                         info->state = bond_slave_state(slave);
2332                         info->link_failure_count = slave->link_failure_count;
2333                         break;
2334                 }
2335         }
2336
2337         read_unlock(&bond->lock);
2338
2339         return res;
2340 }
2341
2342 /*-------------------------------- Monitoring -------------------------------*/
2343
2344
2345 static int bond_miimon_inspect(struct bonding *bond)
2346 {
2347         struct slave *slave;
2348         int i, link_state, commit = 0;
2349         bool ignore_updelay;
2350
2351         ignore_updelay = !bond->curr_active_slave ? true : false;
2352
2353         bond_for_each_slave(bond, slave, i) {
2354                 slave->new_link = BOND_LINK_NOCHANGE;
2355
2356                 link_state = bond_check_dev_link(bond, slave->dev, 0);
2357
2358                 switch (slave->link) {
2359                 case BOND_LINK_UP:
2360                         if (link_state)
2361                                 continue;
2362
2363                         slave->link = BOND_LINK_FAIL;
2364                         slave->delay = bond->params.downdelay;
2365                         if (slave->delay) {
2366                                 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2367                                         bond->dev->name,
2368                                         (bond->params.mode ==
2369                                          BOND_MODE_ACTIVEBACKUP) ?
2370                                         (bond_is_active_slave(slave) ?
2371                                          "active " : "backup ") : "",
2372                                         slave->dev->name,
2373                                         bond->params.downdelay * bond->params.miimon);
2374                         }
2375                         /*FALLTHRU*/
2376                 case BOND_LINK_FAIL:
2377                         if (link_state) {
2378                                 /*
2379                                  * recovered before downdelay expired
2380                                  */
2381                                 slave->link = BOND_LINK_UP;
2382                                 slave->jiffies = jiffies;
2383                                 pr_info("%s: link status up again after %d ms for interface %s.\n",
2384                                         bond->dev->name,
2385                                         (bond->params.downdelay - slave->delay) *
2386                                         bond->params.miimon,
2387                                         slave->dev->name);
2388                                 continue;
2389                         }
2390
2391                         if (slave->delay <= 0) {
2392                                 slave->new_link = BOND_LINK_DOWN;
2393                                 commit++;
2394                                 continue;
2395                         }
2396
2397                         slave->delay--;
2398                         break;
2399
2400                 case BOND_LINK_DOWN:
2401                         if (!link_state)
2402                                 continue;
2403
2404                         slave->link = BOND_LINK_BACK;
2405                         slave->delay = bond->params.updelay;
2406
2407                         if (slave->delay) {
2408                                 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2409                                         bond->dev->name, slave->dev->name,
2410                                         ignore_updelay ? 0 :
2411                                         bond->params.updelay *
2412                                         bond->params.miimon);
2413                         }
2414                         /*FALLTHRU*/
2415                 case BOND_LINK_BACK:
2416                         if (!link_state) {
2417                                 slave->link = BOND_LINK_DOWN;
2418                                 pr_info("%s: link status down again after %d ms for interface %s.\n",
2419                                         bond->dev->name,
2420                                         (bond->params.updelay - slave->delay) *
2421                                         bond->params.miimon,
2422                                         slave->dev->name);
2423
2424                                 continue;
2425                         }
2426
2427                         if (ignore_updelay)
2428                                 slave->delay = 0;
2429
2430                         if (slave->delay <= 0) {
2431                                 slave->new_link = BOND_LINK_UP;
2432                                 commit++;
2433                                 ignore_updelay = false;
2434                                 continue;
2435                         }
2436
2437                         slave->delay--;
2438                         break;
2439                 }
2440         }
2441
2442         return commit;
2443 }
2444
2445 static void bond_miimon_commit(struct bonding *bond)
2446 {
2447         struct slave *slave;
2448         int i;
2449
2450         bond_for_each_slave(bond, slave, i) {
2451                 switch (slave->new_link) {
2452                 case BOND_LINK_NOCHANGE:
2453                         continue;
2454
2455                 case BOND_LINK_UP:
2456                         slave->link = BOND_LINK_UP;
2457                         slave->jiffies = jiffies;
2458
2459                         if (bond->params.mode == BOND_MODE_8023AD) {
2460                                 /* prevent it from being the active one */
2461                                 bond_set_backup_slave(slave);
2462                         } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2463                                 /* make it immediately active */
2464                                 bond_set_active_slave(slave);
2465                         } else if (slave != bond->primary_slave) {
2466                                 /* prevent it from being the active one */
2467                                 bond_set_backup_slave(slave);
2468                         }
2469
2470                         pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2471                                 bond->dev->name, slave->dev->name,
2472                                 slave->speed, slave->duplex ? "full" : "half");
2473
2474                         /* notify ad that the link status has changed */
2475                         if (bond->params.mode == BOND_MODE_8023AD)
2476                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2477
2478                         if (bond_is_lb(bond))
2479                                 bond_alb_handle_link_change(bond, slave,
2480                                                             BOND_LINK_UP);
2481
2482                         if (!bond->curr_active_slave ||
2483                             (slave == bond->primary_slave))
2484                                 goto do_failover;
2485
2486                         continue;
2487
2488                 case BOND_LINK_DOWN:
2489                         if (slave->link_failure_count < UINT_MAX)
2490                                 slave->link_failure_count++;
2491
2492                         slave->link = BOND_LINK_DOWN;
2493
2494                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2495                             bond->params.mode == BOND_MODE_8023AD)
2496                                 bond_set_slave_inactive_flags(slave);
2497
2498                         pr_info("%s: link status definitely down for interface %s, disabling it\n",
2499                                 bond->dev->name, slave->dev->name);
2500
2501                         if (bond->params.mode == BOND_MODE_8023AD)
2502                                 bond_3ad_handle_link_change(slave,
2503                                                             BOND_LINK_DOWN);
2504
2505                         if (bond_is_lb(bond))
2506                                 bond_alb_handle_link_change(bond, slave,
2507                                                             BOND_LINK_DOWN);
2508
2509                         if (slave == bond->curr_active_slave)
2510                                 goto do_failover;
2511
2512                         continue;
2513
2514                 default:
2515                         pr_err("%s: invalid new link %d on slave %s\n",
2516                                bond->dev->name, slave->new_link,
2517                                slave->dev->name);
2518                         slave->new_link = BOND_LINK_NOCHANGE;
2519
2520                         continue;
2521                 }
2522
2523 do_failover:
2524                 ASSERT_RTNL();
2525                 block_netpoll_tx();
2526                 write_lock_bh(&bond->curr_slave_lock);
2527                 bond_select_active_slave(bond);
2528                 write_unlock_bh(&bond->curr_slave_lock);
2529                 unblock_netpoll_tx();
2530         }
2531
2532         bond_set_carrier(bond);
2533 }
2534
2535 /*
2536  * bond_mii_monitor
2537  *
2538  * Really a wrapper that splits the mii monitor into two phases: an
2539  * inspection, then (if inspection indicates something needs to be done)
2540  * an acquisition of appropriate locks followed by a commit phase to
2541  * implement whatever link state changes are indicated.
2542  */
2543 void bond_mii_monitor(struct work_struct *work)
2544 {
2545         struct bonding *bond = container_of(work, struct bonding,
2546                                             mii_work.work);
2547         bool should_notify_peers = false;
2548         unsigned long delay;
2549
2550         read_lock(&bond->lock);
2551
2552         delay = msecs_to_jiffies(bond->params.miimon);
2553
2554         if (bond->slave_cnt == 0)
2555                 goto re_arm;
2556
2557         should_notify_peers = bond_should_notify_peers(bond);
2558
2559         if (bond_miimon_inspect(bond)) {
2560                 read_unlock(&bond->lock);
2561
2562                 /* Race avoidance with bond_close cancel of workqueue */
2563                 if (!rtnl_trylock()) {
2564                         read_lock(&bond->lock);
2565                         delay = 1;
2566                         should_notify_peers = false;
2567                         goto re_arm;
2568                 }
2569
2570                 read_lock(&bond->lock);
2571
2572                 bond_miimon_commit(bond);
2573
2574                 read_unlock(&bond->lock);
2575                 rtnl_unlock();  /* might sleep, hold no other locks */
2576                 read_lock(&bond->lock);
2577         }
2578
2579 re_arm:
2580         if (bond->params.miimon)
2581                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2582
2583         read_unlock(&bond->lock);
2584
2585         if (should_notify_peers) {
2586                 if (!rtnl_trylock()) {
2587                         read_lock(&bond->lock);
2588                         bond->send_peer_notif++;
2589                         read_unlock(&bond->lock);
2590                         return;
2591                 }
2592                 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2593                 rtnl_unlock();
2594         }
2595 }
2596
2597 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2598 {
2599         struct vlan_entry *vlan;
2600
2601         if (ip == bond->master_ip)
2602                 return 1;
2603
2604         list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2605                 if (ip == vlan->vlan_ip)
2606                         return 1;
2607         }
2608
2609         return 0;
2610 }
2611
2612 /*
2613  * We go to the (large) trouble of VLAN tagging ARP frames because
2614  * switches in VLAN mode (especially if ports are configured as
2615  * "native" to a VLAN) might not pass non-tagged frames.
2616  */
2617 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2618 {
2619         struct sk_buff *skb;
2620
2621         pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2622                  slave_dev->name, dest_ip, src_ip, vlan_id);
2623
2624         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2625                          NULL, slave_dev->dev_addr, NULL);
2626
2627         if (!skb) {
2628                 pr_err("ARP packet allocation failed\n");
2629                 return;
2630         }
2631         if (vlan_id) {
2632                 skb = vlan_put_tag(skb, vlan_id);
2633                 if (!skb) {
2634                         pr_err("failed to insert VLAN tag\n");
2635                         return;
2636                 }
2637         }
2638         arp_xmit(skb);
2639 }
2640
2641
2642 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2643 {
2644         int i, vlan_id;
2645         __be32 *targets = bond->params.arp_targets;
2646         struct vlan_entry *vlan;
2647         struct net_device *vlan_dev;
2648         struct rtable *rt;
2649
2650         for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2651                 if (!targets[i])
2652                         break;
2653                 pr_debug("basa: target %x\n", targets[i]);
2654                 if (!bond_vlan_used(bond)) {
2655                         pr_debug("basa: empty vlan: arp_send\n");
2656                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2657                                       bond->master_ip, 0);
2658                         continue;
2659                 }
2660
2661                 /*
2662                  * If VLANs are configured, we do a route lookup to
2663                  * determine which VLAN interface would be used, so we
2664                  * can tag the ARP with the proper VLAN tag.
2665                  */
2666                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2667                                      RTO_ONLINK, 0);
2668                 if (IS_ERR(rt)) {
2669                         if (net_ratelimit()) {
2670                                 pr_warning("%s: no route to arp_ip_target %pI4\n",
2671                                            bond->dev->name, &targets[i]);
2672                         }
2673                         continue;
2674                 }
2675
2676                 /*
2677                  * This target is not on a VLAN
2678                  */
2679                 if (rt->dst.dev == bond->dev) {
2680                         ip_rt_put(rt);
2681                         pr_debug("basa: rtdev == bond->dev: arp_send\n");
2682                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2683                                       bond->master_ip, 0);
2684                         continue;
2685                 }
2686
2687                 vlan_id = 0;
2688                 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2689                         rcu_read_lock();
2690                         vlan_dev = __vlan_find_dev_deep(bond->dev,
2691                                                         vlan->vlan_id);
2692                         rcu_read_unlock();
2693                         if (vlan_dev == rt->dst.dev) {
2694                                 vlan_id = vlan->vlan_id;
2695                                 pr_debug("basa: vlan match on %s %d\n",
2696                                        vlan_dev->name, vlan_id);
2697                                 break;
2698                         }
2699                 }
2700
2701                 if (vlan_id) {
2702                         ip_rt_put(rt);
2703                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2704                                       vlan->vlan_ip, vlan_id);
2705                         continue;
2706                 }
2707
2708                 if (net_ratelimit()) {
2709                         pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2710                                    bond->dev->name, &targets[i],
2711                                    rt->dst.dev ? rt->dst.dev->name : "NULL");
2712                 }
2713                 ip_rt_put(rt);
2714         }
2715 }
2716
2717 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2718 {
2719         int i;
2720         __be32 *targets = bond->params.arp_targets;
2721
2722         for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2723                 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2724                          &sip, &tip, i, &targets[i],
2725                          bond_has_this_ip(bond, tip));
2726                 if (sip == targets[i]) {
2727                         if (bond_has_this_ip(bond, tip))
2728                                 slave->last_arp_rx = jiffies;
2729                         return;
2730                 }
2731         }
2732 }
2733
2734 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2735                          struct slave *slave)
2736 {
2737         struct arphdr *arp;
2738         unsigned char *arp_ptr;
2739         __be32 sip, tip;
2740
2741         if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2742                 return;
2743
2744         read_lock(&bond->lock);
2745
2746         pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2747                  bond->dev->name, skb->dev->name);
2748
2749         if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2750                 goto out_unlock;
2751
2752         arp = arp_hdr(skb);
2753         if (arp->ar_hln != bond->dev->addr_len ||
2754             skb->pkt_type == PACKET_OTHERHOST ||
2755             skb->pkt_type == PACKET_LOOPBACK ||
2756             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2757             arp->ar_pro != htons(ETH_P_IP) ||
2758             arp->ar_pln != 4)
2759                 goto out_unlock;
2760
2761         arp_ptr = (unsigned char *)(arp + 1);
2762         arp_ptr += bond->dev->addr_len;
2763         memcpy(&sip, arp_ptr, 4);
2764         arp_ptr += 4 + bond->dev->addr_len;
2765         memcpy(&tip, arp_ptr, 4);
2766
2767         pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2768                  bond->dev->name, slave->dev->name, bond_slave_state(slave),
2769                  bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2770                  &sip, &tip);
2771
2772         /*
2773          * Backup slaves won't see the ARP reply, but do come through
2774          * here for each ARP probe (so we swap the sip/tip to validate
2775          * the probe).  In a "redundant switch, common router" type of
2776          * configuration, the ARP probe will (hopefully) travel from
2777          * the active, through one switch, the router, then the other
2778          * switch before reaching the backup.
2779          */
2780         if (bond_is_active_slave(slave))
2781                 bond_validate_arp(bond, slave, sip, tip);
2782         else
2783                 bond_validate_arp(bond, slave, tip, sip);
2784
2785 out_unlock:
2786         read_unlock(&bond->lock);
2787 }
2788
2789 /*
2790  * this function is called regularly to monitor each slave's link
2791  * ensuring that traffic is being sent and received when arp monitoring
2792  * is used in load-balancing mode. if the adapter has been dormant, then an
2793  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2794  * arp monitoring in active backup mode.
2795  */
2796 void bond_loadbalance_arp_mon(struct work_struct *work)
2797 {
2798         struct bonding *bond = container_of(work, struct bonding,
2799                                             arp_work.work);
2800         struct slave *slave, *oldcurrent;
2801         int do_failover = 0;
2802         int delta_in_ticks;
2803         int i;
2804
2805         read_lock(&bond->lock);
2806
2807         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2808
2809         if (bond->slave_cnt == 0)
2810                 goto re_arm;
2811
2812         read_lock(&bond->curr_slave_lock);
2813         oldcurrent = bond->curr_active_slave;
2814         read_unlock(&bond->curr_slave_lock);
2815
2816         /* see if any of the previous devices are up now (i.e. they have
2817          * xmt and rcv traffic). the curr_active_slave does not come into
2818          * the picture unless it is null. also, slave->jiffies is not needed
2819          * here because we send an arp on each slave and give a slave as
2820          * long as it needs to get the tx/rx within the delta.
2821          * TODO: what about up/down delay in arp mode? it wasn't here before
2822          *       so it can wait
2823          */
2824         bond_for_each_slave(bond, slave, i) {
2825                 unsigned long trans_start = dev_trans_start(slave->dev);
2826
2827                 if (slave->link != BOND_LINK_UP) {
2828                         if (time_in_range(jiffies,
2829                                 trans_start - delta_in_ticks,
2830                                 trans_start + delta_in_ticks) &&
2831                             time_in_range(jiffies,
2832                                 slave->dev->last_rx - delta_in_ticks,
2833                                 slave->dev->last_rx + delta_in_ticks)) {
2834
2835                                 slave->link  = BOND_LINK_UP;
2836                                 bond_set_active_slave(slave);
2837
2838                                 /* primary_slave has no meaning in round-robin
2839                                  * mode. the window of a slave being up and
2840                                  * curr_active_slave being null after enslaving
2841                                  * is closed.
2842                                  */
2843                                 if (!oldcurrent) {
2844                                         pr_info("%s: link status definitely up for interface %s, ",
2845                                                 bond->dev->name,
2846                                                 slave->dev->name);
2847                                         do_failover = 1;
2848                                 } else {
2849                                         pr_info("%s: interface %s is now up\n",
2850                                                 bond->dev->name,
2851                                                 slave->dev->name);
2852                                 }
2853                         }
2854                 } else {
2855                         /* slave->link == BOND_LINK_UP */
2856
2857                         /* not all switches will respond to an arp request
2858                          * when the source ip is 0, so don't take the link down
2859                          * if we don't know our ip yet
2860                          */
2861                         if (!time_in_range(jiffies,
2862                                 trans_start - delta_in_ticks,
2863                                 trans_start + 2 * delta_in_ticks) ||
2864                             !time_in_range(jiffies,
2865                                 slave->dev->last_rx - delta_in_ticks,
2866                                 slave->dev->last_rx + 2 * delta_in_ticks)) {
2867
2868                                 slave->link  = BOND_LINK_DOWN;
2869                                 bond_set_backup_slave(slave);
2870
2871                                 if (slave->link_failure_count < UINT_MAX)
2872                                         slave->link_failure_count++;
2873
2874                                 pr_info("%s: interface %s is now down.\n",
2875                                         bond->dev->name,
2876                                         slave->dev->name);
2877
2878                                 if (slave == oldcurrent)
2879                                         do_failover = 1;
2880                         }
2881                 }
2882
2883                 /* note: if switch is in round-robin mode, all links
2884                  * must tx arp to ensure all links rx an arp - otherwise
2885                  * links may oscillate or not come up at all; if switch is
2886                  * in something like xor mode, there is nothing we can
2887                  * do - all replies will be rx'ed on same link causing slaves
2888                  * to be unstable during low/no traffic periods
2889                  */
2890                 if (IS_UP(slave->dev))
2891                         bond_arp_send_all(bond, slave);
2892         }
2893
2894         if (do_failover) {
2895                 block_netpoll_tx();
2896                 write_lock_bh(&bond->curr_slave_lock);
2897
2898                 bond_select_active_slave(bond);
2899
2900                 write_unlock_bh(&bond->curr_slave_lock);
2901                 unblock_netpoll_tx();
2902         }
2903
2904 re_arm:
2905         if (bond->params.arp_interval)
2906                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2907
2908         read_unlock(&bond->lock);
2909 }
2910
2911 /*
2912  * Called to inspect slaves for active-backup mode ARP monitor link state
2913  * changes.  Sets new_link in slaves to specify what action should take
2914  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2915  * to link states must be committed.
2916  *
2917  * Called with bond->lock held for read.
2918  */
2919 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2920 {
2921         struct slave *slave;
2922         int i, commit = 0;
2923         unsigned long trans_start;
2924
2925         bond_for_each_slave(bond, slave, i) {
2926                 slave->new_link = BOND_LINK_NOCHANGE;
2927
2928                 if (slave->link != BOND_LINK_UP) {
2929                         if (time_in_range(jiffies,
2930                                 slave_last_rx(bond, slave) - delta_in_ticks,
2931                                 slave_last_rx(bond, slave) + delta_in_ticks)) {
2932
2933                                 slave->new_link = BOND_LINK_UP;
2934                                 commit++;
2935                         }
2936
2937                         continue;
2938                 }
2939
2940                 /*
2941                  * Give slaves 2*delta after being enslaved or made
2942                  * active.  This avoids bouncing, as the last receive
2943                  * times need a full ARP monitor cycle to be updated.
2944                  */
2945                 if (time_in_range(jiffies,
2946                                   slave->jiffies - delta_in_ticks,
2947                                   slave->jiffies + 2 * delta_in_ticks))
2948                         continue;
2949
2950                 /*
2951                  * Backup slave is down if:
2952                  * - No current_arp_slave AND
2953                  * - more than 3*delta since last receive AND
2954                  * - the bond has an IP address
2955                  *
2956                  * Note: a non-null current_arp_slave indicates
2957                  * the curr_active_slave went down and we are
2958                  * searching for a new one; under this condition
2959                  * we only take the curr_active_slave down - this
2960                  * gives each slave a chance to tx/rx traffic
2961                  * before being taken out
2962                  */
2963                 if (!bond_is_active_slave(slave) &&
2964                     !bond->current_arp_slave &&
2965                     !time_in_range(jiffies,
2966                         slave_last_rx(bond, slave) - delta_in_ticks,
2967                         slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2968
2969                         slave->new_link = BOND_LINK_DOWN;
2970                         commit++;
2971                 }
2972
2973                 /*
2974                  * Active slave is down if:
2975                  * - more than 2*delta since transmitting OR
2976                  * - (more than 2*delta since receive AND
2977                  *    the bond has an IP address)
2978                  */
2979                 trans_start = dev_trans_start(slave->dev);
2980                 if (bond_is_active_slave(slave) &&
2981                     (!time_in_range(jiffies,
2982                         trans_start - delta_in_ticks,
2983                         trans_start + 2 * delta_in_ticks) ||
2984                      !time_in_range(jiffies,
2985                         slave_last_rx(bond, slave) - delta_in_ticks,
2986                         slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2987
2988                         slave->new_link = BOND_LINK_DOWN;
2989                         commit++;
2990                 }
2991         }
2992
2993         return commit;
2994 }
2995
2996 /*
2997  * Called to commit link state changes noted by inspection step of
2998  * active-backup mode ARP monitor.
2999  *
3000  * Called with RTNL and bond->lock for read.
3001  */
3002 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3003 {
3004         struct slave *slave;
3005         int i;
3006         unsigned long trans_start;
3007
3008         bond_for_each_slave(bond, slave, i) {
3009                 switch (slave->new_link) {
3010                 case BOND_LINK_NOCHANGE:
3011                         continue;
3012
3013                 case BOND_LINK_UP:
3014                         trans_start = dev_trans_start(slave->dev);
3015                         if ((!bond->curr_active_slave &&
3016                              time_in_range(jiffies,
3017                                &nb