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[deliverable/linux.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 "bonding.h"
81 #include "bond_3ad.h"
82 #include "bond_alb.h"
83
84 /*---------------------------- Module parameters ----------------------------*/
85
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV 0
88 #define BOND_LINK_ARP_INTERV 0
89
90 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92 static int num_grat_arp = 1;
93 static int num_unsol_na = 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 char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval = BOND_LINK_ARP_INTERV;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *fail_over_mac;
108 static int all_slaves_active = 0;
109 static struct bond_params bonding_defaults;
110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
111
112 module_param(max_bonds, int, 0);
113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114 module_param(tx_queues, int, 0);
115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116 module_param(num_grat_arp, int, 0644);
117 MODULE_PARM_DESC(num_grat_arp, "Number of gratuitous ARP packets to send on failover event");
118 module_param(num_unsol_na, int, 0644);
119 MODULE_PARM_DESC(num_unsol_na, "Number of unsolicited IPv6 Neighbor Advertisements packets to send on failover event");
120 module_param(miimon, int, 0);
121 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
122 module_param(updelay, int, 0);
123 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
124 module_param(downdelay, int, 0);
125 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
126 "in milliseconds");
127 module_param(use_carrier, int, 0);
128 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
129 "0 for off, 1 for on (default)");
130 module_param(mode, charp, 0);
131 MODULE_PARM_DESC(mode, "Mode of operation : 0 for balance-rr, "
132 "1 for active-backup, 2 for balance-xor, "
133 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
134 "6 for balance-alb");
135 module_param(primary, charp, 0);
136 MODULE_PARM_DESC(primary, "Primary network device to use");
137 module_param(primary_reselect, charp, 0);
138 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
139 "once it comes up; "
140 "0 for always (default), "
141 "1 for only if speed of primary is "
142 "better, "
143 "2 for only on active slave "
144 "failure");
145 module_param(lacp_rate, charp, 0);
146 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner "
147 "(slow/fast)");
148 module_param(ad_select, charp, 0);
149 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic: stable (0, default), bandwidth (1), count (2)");
150 module_param(xmit_hash_policy, charp, 0);
151 MODULE_PARM_DESC(xmit_hash_policy, "XOR hashing method: 0 for layer 2 (default)"
152 ", 1 for layer 3+4");
153 module_param(arp_interval, int, 0);
154 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
155 module_param_array(arp_ip_target, charp, NULL, 0);
156 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
157 module_param(arp_validate, charp, 0);
158 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
159 module_param(fail_over_mac, charp, 0);
160 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC. none (default), active or follow");
161 module_param(all_slaves_active, int, 0);
162 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
163 "by setting active flag for all slaves. "
164 "0 for never (default), 1 for always.");
165 module_param(resend_igmp, int, 0);
166 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on link failure");
167
168 /*----------------------------- Global variables ----------------------------*/
169
170 #ifdef CONFIG_NET_POLL_CONTROLLER
171 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
172 #endif
173
174 int bond_net_id __read_mostly;
175
176 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
177 static int arp_ip_count;
178 static int bond_mode = BOND_MODE_ROUNDROBIN;
179 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
180 static int lacp_fast;
181
182 const struct bond_parm_tbl bond_lacp_tbl[] = {
183 { "slow", AD_LACP_SLOW},
184 { "fast", AD_LACP_FAST},
185 { NULL, -1},
186 };
187
188 const struct bond_parm_tbl bond_mode_tbl[] = {
189 { "balance-rr", BOND_MODE_ROUNDROBIN},
190 { "active-backup", BOND_MODE_ACTIVEBACKUP},
191 { "balance-xor", BOND_MODE_XOR},
192 { "broadcast", BOND_MODE_BROADCAST},
193 { "802.3ad", BOND_MODE_8023AD},
194 { "balance-tlb", BOND_MODE_TLB},
195 { "balance-alb", BOND_MODE_ALB},
196 { NULL, -1},
197 };
198
199 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
200 { "layer2", BOND_XMIT_POLICY_LAYER2},
201 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
202 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
203 { NULL, -1},
204 };
205
206 const struct bond_parm_tbl arp_validate_tbl[] = {
207 { "none", BOND_ARP_VALIDATE_NONE},
208 { "active", BOND_ARP_VALIDATE_ACTIVE},
209 { "backup", BOND_ARP_VALIDATE_BACKUP},
210 { "all", BOND_ARP_VALIDATE_ALL},
211 { NULL, -1},
212 };
213
214 const struct bond_parm_tbl fail_over_mac_tbl[] = {
215 { "none", BOND_FOM_NONE},
216 { "active", BOND_FOM_ACTIVE},
217 { "follow", BOND_FOM_FOLLOW},
218 { NULL, -1},
219 };
220
221 const struct bond_parm_tbl pri_reselect_tbl[] = {
222 { "always", BOND_PRI_RESELECT_ALWAYS},
223 { "better", BOND_PRI_RESELECT_BETTER},
224 { "failure", BOND_PRI_RESELECT_FAILURE},
225 { NULL, -1},
226 };
227
228 struct bond_parm_tbl ad_select_tbl[] = {
229 { "stable", BOND_AD_STABLE},
230 { "bandwidth", BOND_AD_BANDWIDTH},
231 { "count", BOND_AD_COUNT},
232 { NULL, -1},
233 };
234
235 /*-------------------------- Forward declarations ---------------------------*/
236
237 static void bond_send_gratuitous_arp(struct bonding *bond);
238 static int bond_init(struct net_device *bond_dev);
239 static void bond_uninit(struct net_device *bond_dev);
240
241 /*---------------------------- General routines -----------------------------*/
242
243 const char *bond_mode_name(int mode)
244 {
245 static const char *names[] = {
246 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
247 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
248 [BOND_MODE_XOR] = "load balancing (xor)",
249 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
250 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
251 [BOND_MODE_TLB] = "transmit load balancing",
252 [BOND_MODE_ALB] = "adaptive load balancing",
253 };
254
255 if (mode < 0 || mode > BOND_MODE_ALB)
256 return "unknown";
257
258 return names[mode];
259 }
260
261 /*---------------------------------- VLAN -----------------------------------*/
262
263 /**
264 * bond_add_vlan - add a new vlan id on bond
265 * @bond: bond that got the notification
266 * @vlan_id: the vlan id to add
267 *
268 * Returns -ENOMEM if allocation failed.
269 */
270 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
271 {
272 struct vlan_entry *vlan;
273
274 pr_debug("bond: %s, vlan id %d\n",
275 (bond ? bond->dev->name : "None"), vlan_id);
276
277 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
278 if (!vlan)
279 return -ENOMEM;
280
281 INIT_LIST_HEAD(&vlan->vlan_list);
282 vlan->vlan_id = vlan_id;
283
284 write_lock_bh(&bond->lock);
285
286 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
287
288 write_unlock_bh(&bond->lock);
289
290 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
291
292 return 0;
293 }
294
295 /**
296 * bond_del_vlan - delete a vlan id from bond
297 * @bond: bond that got the notification
298 * @vlan_id: the vlan id to delete
299 *
300 * returns -ENODEV if @vlan_id was not found in @bond.
301 */
302 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
303 {
304 struct vlan_entry *vlan;
305 int res = -ENODEV;
306
307 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
308
309 block_netpoll_tx();
310 write_lock_bh(&bond->lock);
311
312 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
313 if (vlan->vlan_id == vlan_id) {
314 list_del(&vlan->vlan_list);
315
316 if (bond_is_lb(bond))
317 bond_alb_clear_vlan(bond, vlan_id);
318
319 pr_debug("removed VLAN ID %d from bond %s\n",
320 vlan_id, bond->dev->name);
321
322 kfree(vlan);
323
324 if (list_empty(&bond->vlan_list) &&
325 (bond->slave_cnt == 0)) {
326 /* Last VLAN removed and no slaves, so
327 * restore block on adding VLANs. This will
328 * be removed once new slaves that are not
329 * VLAN challenged will be added.
330 */
331 bond->dev->features |= NETIF_F_VLAN_CHALLENGED;
332 }
333
334 res = 0;
335 goto out;
336 }
337 }
338
339 pr_debug("couldn't find VLAN ID %d in bond %s\n",
340 vlan_id, bond->dev->name);
341
342 out:
343 write_unlock_bh(&bond->lock);
344 unblock_netpoll_tx();
345 return res;
346 }
347
348 /**
349 * bond_has_challenged_slaves
350 * @bond: the bond we're working on
351 *
352 * Searches the slave list. Returns 1 if a vlan challenged slave
353 * was found, 0 otherwise.
354 *
355 * Assumes bond->lock is held.
356 */
357 static int bond_has_challenged_slaves(struct bonding *bond)
358 {
359 struct slave *slave;
360 int i;
361
362 bond_for_each_slave(bond, slave, i) {
363 if (slave->dev->features & NETIF_F_VLAN_CHALLENGED) {
364 pr_debug("found VLAN challenged slave - %s\n",
365 slave->dev->name);
366 return 1;
367 }
368 }
369
370 pr_debug("no VLAN challenged slaves found\n");
371 return 0;
372 }
373
374 /**
375 * bond_next_vlan - safely skip to the next item in the vlans list.
376 * @bond: the bond we're working on
377 * @curr: item we're advancing from
378 *
379 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
380 * or @curr->next otherwise (even if it is @curr itself again).
381 *
382 * Caller must hold bond->lock
383 */
384 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
385 {
386 struct vlan_entry *next, *last;
387
388 if (list_empty(&bond->vlan_list))
389 return NULL;
390
391 if (!curr) {
392 next = list_entry(bond->vlan_list.next,
393 struct vlan_entry, vlan_list);
394 } else {
395 last = list_entry(bond->vlan_list.prev,
396 struct vlan_entry, vlan_list);
397 if (last == curr) {
398 next = list_entry(bond->vlan_list.next,
399 struct vlan_entry, vlan_list);
400 } else {
401 next = list_entry(curr->vlan_list.next,
402 struct vlan_entry, vlan_list);
403 }
404 }
405
406 return next;
407 }
408
409 /**
410 * bond_dev_queue_xmit - Prepare skb for xmit.
411 *
412 * @bond: bond device that got this skb for tx.
413 * @skb: hw accel VLAN tagged skb to transmit
414 * @slave_dev: slave that is supposed to xmit this skbuff
415 */
416 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
417 struct net_device *slave_dev)
418 {
419 skb->dev = slave_dev;
420 skb->priority = 1;
421 if (unlikely(netpoll_tx_running(slave_dev)))
422 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
423 else
424 dev_queue_xmit(skb);
425
426 return 0;
427 }
428
429 /*
430 * In the following 3 functions, bond_vlan_rx_register(), bond_vlan_rx_add_vid
431 * and bond_vlan_rx_kill_vid, We don't protect the slave list iteration with a
432 * lock because:
433 * a. This operation is performed in IOCTL context,
434 * b. The operation is protected by the RTNL semaphore in the 8021q code,
435 * c. Holding a lock with BH disabled while directly calling a base driver
436 * entry point is generally a BAD idea.
437 *
438 * The design of synchronization/protection for this operation in the 8021q
439 * module is good for one or more VLAN devices over a single physical device
440 * and cannot be extended for a teaming solution like bonding, so there is a
441 * potential race condition here where a net device from the vlan group might
442 * be referenced (either by a base driver or the 8021q code) while it is being
443 * removed from the system. However, it turns out we're not making matters
444 * worse, and if it works for regular VLAN usage it will work here too.
445 */
446
447 /**
448 * bond_vlan_rx_register - Propagates registration to slaves
449 * @bond_dev: bonding net device that got called
450 * @grp: vlan group being registered
451 */
452 static void bond_vlan_rx_register(struct net_device *bond_dev,
453 struct vlan_group *grp)
454 {
455 struct bonding *bond = netdev_priv(bond_dev);
456 struct slave *slave;
457 int i;
458
459 write_lock_bh(&bond->lock);
460 bond->vlgrp = grp;
461 write_unlock_bh(&bond->lock);
462
463 bond_for_each_slave(bond, slave, i) {
464 struct net_device *slave_dev = slave->dev;
465 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
466
467 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
468 slave_ops->ndo_vlan_rx_register) {
469 slave_ops->ndo_vlan_rx_register(slave_dev, grp);
470 }
471 }
472 }
473
474 /**
475 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
476 * @bond_dev: bonding net device that got called
477 * @vid: vlan id being added
478 */
479 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
480 {
481 struct bonding *bond = netdev_priv(bond_dev);
482 struct slave *slave;
483 int i, res;
484
485 bond_for_each_slave(bond, slave, i) {
486 struct net_device *slave_dev = slave->dev;
487 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
488
489 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
490 slave_ops->ndo_vlan_rx_add_vid) {
491 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
492 }
493 }
494
495 res = bond_add_vlan(bond, vid);
496 if (res) {
497 pr_err("%s: Error: Failed to add vlan id %d\n",
498 bond_dev->name, vid);
499 }
500 }
501
502 /**
503 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
504 * @bond_dev: bonding net device that got called
505 * @vid: vlan id being removed
506 */
507 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
508 {
509 struct bonding *bond = netdev_priv(bond_dev);
510 struct slave *slave;
511 struct net_device *vlan_dev;
512 int i, res;
513
514 bond_for_each_slave(bond, slave, i) {
515 struct net_device *slave_dev = slave->dev;
516 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
517
518 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
519 slave_ops->ndo_vlan_rx_kill_vid) {
520 /* Save and then restore vlan_dev in the grp array,
521 * since the slave's driver might clear it.
522 */
523 vlan_dev = vlan_group_get_device(bond->vlgrp, vid);
524 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
525 vlan_group_set_device(bond->vlgrp, vid, vlan_dev);
526 }
527 }
528
529 res = bond_del_vlan(bond, vid);
530 if (res) {
531 pr_err("%s: Error: Failed to remove vlan id %d\n",
532 bond_dev->name, vid);
533 }
534 }
535
536 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
537 {
538 struct vlan_entry *vlan;
539 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
540
541 if (!bond->vlgrp)
542 return;
543
544 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
545 slave_ops->ndo_vlan_rx_register)
546 slave_ops->ndo_vlan_rx_register(slave_dev, bond->vlgrp);
547
548 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
549 !(slave_ops->ndo_vlan_rx_add_vid))
550 return;
551
552 list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
553 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
554 }
555
556 static void bond_del_vlans_from_slave(struct bonding *bond,
557 struct net_device *slave_dev)
558 {
559 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
560 struct vlan_entry *vlan;
561 struct net_device *vlan_dev;
562
563 if (!bond->vlgrp)
564 return;
565
566 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
567 !(slave_ops->ndo_vlan_rx_kill_vid))
568 goto unreg;
569
570 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
571 if (!vlan->vlan_id)
572 continue;
573 /* Save and then restore vlan_dev in the grp array,
574 * since the slave's driver might clear it.
575 */
576 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
577 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
578 vlan_group_set_device(bond->vlgrp, vlan->vlan_id, vlan_dev);
579 }
580
581 unreg:
582 if ((slave_dev->features & NETIF_F_HW_VLAN_RX) &&
583 slave_ops->ndo_vlan_rx_register)
584 slave_ops->ndo_vlan_rx_register(slave_dev, NULL);
585 }
586
587 /*------------------------------- Link status -------------------------------*/
588
589 /*
590 * Set the carrier state for the master according to the state of its
591 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
592 * do special 802.3ad magic.
593 *
594 * Returns zero if carrier state does not change, nonzero if it does.
595 */
596 static int bond_set_carrier(struct bonding *bond)
597 {
598 struct slave *slave;
599 int i;
600
601 if (bond->slave_cnt == 0)
602 goto down;
603
604 if (bond->params.mode == BOND_MODE_8023AD)
605 return bond_3ad_set_carrier(bond);
606
607 bond_for_each_slave(bond, slave, i) {
608 if (slave->link == BOND_LINK_UP) {
609 if (!netif_carrier_ok(bond->dev)) {
610 netif_carrier_on(bond->dev);
611 return 1;
612 }
613 return 0;
614 }
615 }
616
617 down:
618 if (netif_carrier_ok(bond->dev)) {
619 netif_carrier_off(bond->dev);
620 return 1;
621 }
622 return 0;
623 }
624
625 /*
626 * Get link speed and duplex from the slave's base driver
627 * using ethtool. If for some reason the call fails or the
628 * values are invalid, fake speed and duplex to 100/Full
629 * and return error.
630 */
631 static int bond_update_speed_duplex(struct slave *slave)
632 {
633 struct net_device *slave_dev = slave->dev;
634 struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET };
635 u32 slave_speed;
636 int res;
637
638 /* Fake speed and duplex */
639 slave->speed = SPEED_100;
640 slave->duplex = DUPLEX_FULL;
641
642 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
643 return -1;
644
645 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
646 if (res < 0)
647 return -1;
648
649 slave_speed = ethtool_cmd_speed(&etool);
650 switch (slave_speed) {
651 case SPEED_10:
652 case SPEED_100:
653 case SPEED_1000:
654 case SPEED_10000:
655 break;
656 default:
657 return -1;
658 }
659
660 switch (etool.duplex) {
661 case DUPLEX_FULL:
662 case DUPLEX_HALF:
663 break;
664 default:
665 return -1;
666 }
667
668 slave->speed = slave_speed;
669 slave->duplex = etool.duplex;
670
671 return 0;
672 }
673
674 /*
675 * if <dev> supports MII link status reporting, check its link status.
676 *
677 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
678 * depending upon the setting of the use_carrier parameter.
679 *
680 * Return either BMSR_LSTATUS, meaning that the link is up (or we
681 * can't tell and just pretend it is), or 0, meaning that the link is
682 * down.
683 *
684 * If reporting is non-zero, instead of faking link up, return -1 if
685 * both ETHTOOL and MII ioctls fail (meaning the device does not
686 * support them). If use_carrier is set, return whatever it says.
687 * It'd be nice if there was a good way to tell if a driver supports
688 * netif_carrier, but there really isn't.
689 */
690 static int bond_check_dev_link(struct bonding *bond,
691 struct net_device *slave_dev, int reporting)
692 {
693 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
694 int (*ioctl)(struct net_device *, struct ifreq *, int);
695 struct ifreq ifr;
696 struct mii_ioctl_data *mii;
697
698 if (!reporting && !netif_running(slave_dev))
699 return 0;
700
701 if (bond->params.use_carrier)
702 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
703
704 /* Try to get link status using Ethtool first. */
705 if (slave_dev->ethtool_ops) {
706 if (slave_dev->ethtool_ops->get_link) {
707 u32 link;
708
709 link = slave_dev->ethtool_ops->get_link(slave_dev);
710
711 return link ? BMSR_LSTATUS : 0;
712 }
713 }
714
715 /* Ethtool can't be used, fallback to MII ioctls. */
716 ioctl = slave_ops->ndo_do_ioctl;
717 if (ioctl) {
718 /* TODO: set pointer to correct ioctl on a per team member */
719 /* bases to make this more efficient. that is, once */
720 /* we determine the correct ioctl, we will always */
721 /* call it and not the others for that team */
722 /* member. */
723
724 /*
725 * We cannot assume that SIOCGMIIPHY will also read a
726 * register; not all network drivers (e.g., e100)
727 * support that.
728 */
729
730 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
731 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
732 mii = if_mii(&ifr);
733 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
734 mii->reg_num = MII_BMSR;
735 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
736 return mii->val_out & BMSR_LSTATUS;
737 }
738 }
739
740 /*
741 * If reporting, report that either there's no dev->do_ioctl,
742 * or both SIOCGMIIREG and get_link failed (meaning that we
743 * cannot report link status). If not reporting, pretend
744 * we're ok.
745 */
746 return reporting ? -1 : BMSR_LSTATUS;
747 }
748
749 /*----------------------------- Multicast list ------------------------------*/
750
751 /*
752 * Push the promiscuity flag down to appropriate slaves
753 */
754 static int bond_set_promiscuity(struct bonding *bond, int inc)
755 {
756 int err = 0;
757 if (USES_PRIMARY(bond->params.mode)) {
758 /* write lock already acquired */
759 if (bond->curr_active_slave) {
760 err = dev_set_promiscuity(bond->curr_active_slave->dev,
761 inc);
762 }
763 } else {
764 struct slave *slave;
765 int i;
766 bond_for_each_slave(bond, slave, i) {
767 err = dev_set_promiscuity(slave->dev, inc);
768 if (err)
769 return err;
770 }
771 }
772 return err;
773 }
774
775 /*
776 * Push the allmulti flag down to all slaves
777 */
778 static int bond_set_allmulti(struct bonding *bond, int inc)
779 {
780 int err = 0;
781 if (USES_PRIMARY(bond->params.mode)) {
782 /* write lock already acquired */
783 if (bond->curr_active_slave) {
784 err = dev_set_allmulti(bond->curr_active_slave->dev,
785 inc);
786 }
787 } else {
788 struct slave *slave;
789 int i;
790 bond_for_each_slave(bond, slave, i) {
791 err = dev_set_allmulti(slave->dev, inc);
792 if (err)
793 return err;
794 }
795 }
796 return err;
797 }
798
799 /*
800 * Add a Multicast address to slaves
801 * according to mode
802 */
803 static void bond_mc_add(struct bonding *bond, void *addr)
804 {
805 if (USES_PRIMARY(bond->params.mode)) {
806 /* write lock already acquired */
807 if (bond->curr_active_slave)
808 dev_mc_add(bond->curr_active_slave->dev, addr);
809 } else {
810 struct slave *slave;
811 int i;
812
813 bond_for_each_slave(bond, slave, i)
814 dev_mc_add(slave->dev, addr);
815 }
816 }
817
818 /*
819 * Remove a multicast address from slave
820 * according to mode
821 */
822 static void bond_mc_del(struct bonding *bond, void *addr)
823 {
824 if (USES_PRIMARY(bond->params.mode)) {
825 /* write lock already acquired */
826 if (bond->curr_active_slave)
827 dev_mc_del(bond->curr_active_slave->dev, addr);
828 } else {
829 struct slave *slave;
830 int i;
831 bond_for_each_slave(bond, slave, i) {
832 dev_mc_del(slave->dev, addr);
833 }
834 }
835 }
836
837
838 static void __bond_resend_igmp_join_requests(struct net_device *dev)
839 {
840 struct in_device *in_dev;
841
842 rcu_read_lock();
843 in_dev = __in_dev_get_rcu(dev);
844 if (in_dev)
845 ip_mc_rejoin_groups(in_dev);
846 rcu_read_unlock();
847 }
848
849 /*
850 * Retrieve the list of registered multicast addresses for the bonding
851 * device and retransmit an IGMP JOIN request to the current active
852 * slave.
853 */
854 static void bond_resend_igmp_join_requests(struct bonding *bond)
855 {
856 struct net_device *vlan_dev;
857 struct vlan_entry *vlan;
858
859 read_lock(&bond->lock);
860
861 /* rejoin all groups on bond device */
862 __bond_resend_igmp_join_requests(bond->dev);
863
864 /* rejoin all groups on vlan devices */
865 if (bond->vlgrp) {
866 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
867 vlan_dev = vlan_group_get_device(bond->vlgrp,
868 vlan->vlan_id);
869 if (vlan_dev)
870 __bond_resend_igmp_join_requests(vlan_dev);
871 }
872 }
873
874 if (--bond->igmp_retrans > 0)
875 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
876
877 read_unlock(&bond->lock);
878 }
879
880 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
881 {
882 struct bonding *bond = container_of(work, struct bonding,
883 mcast_work.work);
884 bond_resend_igmp_join_requests(bond);
885 }
886
887 /*
888 * flush all members of flush->mc_list from device dev->mc_list
889 */
890 static void bond_mc_list_flush(struct net_device *bond_dev,
891 struct net_device *slave_dev)
892 {
893 struct bonding *bond = netdev_priv(bond_dev);
894 struct netdev_hw_addr *ha;
895
896 netdev_for_each_mc_addr(ha, bond_dev)
897 dev_mc_del(slave_dev, ha->addr);
898
899 if (bond->params.mode == BOND_MODE_8023AD) {
900 /* del lacpdu mc addr from mc list */
901 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
902
903 dev_mc_del(slave_dev, lacpdu_multicast);
904 }
905 }
906
907 /*--------------------------- Active slave change ---------------------------*/
908
909 /*
910 * Update the mc list and multicast-related flags for the new and
911 * old active slaves (if any) according to the multicast mode, and
912 * promiscuous flags unconditionally.
913 */
914 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
915 struct slave *old_active)
916 {
917 struct netdev_hw_addr *ha;
918
919 if (!USES_PRIMARY(bond->params.mode))
920 /* nothing to do - mc list is already up-to-date on
921 * all slaves
922 */
923 return;
924
925 if (old_active) {
926 if (bond->dev->flags & IFF_PROMISC)
927 dev_set_promiscuity(old_active->dev, -1);
928
929 if (bond->dev->flags & IFF_ALLMULTI)
930 dev_set_allmulti(old_active->dev, -1);
931
932 netdev_for_each_mc_addr(ha, bond->dev)
933 dev_mc_del(old_active->dev, ha->addr);
934 }
935
936 if (new_active) {
937 /* FIXME: Signal errors upstream. */
938 if (bond->dev->flags & IFF_PROMISC)
939 dev_set_promiscuity(new_active->dev, 1);
940
941 if (bond->dev->flags & IFF_ALLMULTI)
942 dev_set_allmulti(new_active->dev, 1);
943
944 netdev_for_each_mc_addr(ha, bond->dev)
945 dev_mc_add(new_active->dev, ha->addr);
946 }
947 }
948
949 /*
950 * bond_do_fail_over_mac
951 *
952 * Perform special MAC address swapping for fail_over_mac settings
953 *
954 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
955 */
956 static void bond_do_fail_over_mac(struct bonding *bond,
957 struct slave *new_active,
958 struct slave *old_active)
959 __releases(&bond->curr_slave_lock)
960 __releases(&bond->lock)
961 __acquires(&bond->lock)
962 __acquires(&bond->curr_slave_lock)
963 {
964 u8 tmp_mac[ETH_ALEN];
965 struct sockaddr saddr;
966 int rv;
967
968 switch (bond->params.fail_over_mac) {
969 case BOND_FOM_ACTIVE:
970 if (new_active)
971 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
972 new_active->dev->addr_len);
973 break;
974 case BOND_FOM_FOLLOW:
975 /*
976 * if new_active && old_active, swap them
977 * if just old_active, do nothing (going to no active slave)
978 * if just new_active, set new_active to bond's MAC
979 */
980 if (!new_active)
981 return;
982
983 write_unlock_bh(&bond->curr_slave_lock);
984 read_unlock(&bond->lock);
985
986 if (old_active) {
987 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
988 memcpy(saddr.sa_data, old_active->dev->dev_addr,
989 ETH_ALEN);
990 saddr.sa_family = new_active->dev->type;
991 } else {
992 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
993 saddr.sa_family = bond->dev->type;
994 }
995
996 rv = dev_set_mac_address(new_active->dev, &saddr);
997 if (rv) {
998 pr_err("%s: Error %d setting MAC of slave %s\n",
999 bond->dev->name, -rv, new_active->dev->name);
1000 goto out;
1001 }
1002
1003 if (!old_active)
1004 goto out;
1005
1006 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
1007 saddr.sa_family = old_active->dev->type;
1008
1009 rv = dev_set_mac_address(old_active->dev, &saddr);
1010 if (rv)
1011 pr_err("%s: Error %d setting MAC of slave %s\n",
1012 bond->dev->name, -rv, new_active->dev->name);
1013 out:
1014 read_lock(&bond->lock);
1015 write_lock_bh(&bond->curr_slave_lock);
1016 break;
1017 default:
1018 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
1019 bond->dev->name, bond->params.fail_over_mac);
1020 break;
1021 }
1022
1023 }
1024
1025 static bool bond_should_change_active(struct bonding *bond)
1026 {
1027 struct slave *prim = bond->primary_slave;
1028 struct slave *curr = bond->curr_active_slave;
1029
1030 if (!prim || !curr || curr->link != BOND_LINK_UP)
1031 return true;
1032 if (bond->force_primary) {
1033 bond->force_primary = false;
1034 return true;
1035 }
1036 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
1037 (prim->speed < curr->speed ||
1038 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
1039 return false;
1040 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
1041 return false;
1042 return true;
1043 }
1044
1045 /**
1046 * find_best_interface - select the best available slave to be the active one
1047 * @bond: our bonding struct
1048 *
1049 * Warning: Caller must hold curr_slave_lock for writing.
1050 */
1051 static struct slave *bond_find_best_slave(struct bonding *bond)
1052 {
1053 struct slave *new_active, *old_active;
1054 struct slave *bestslave = NULL;
1055 int mintime = bond->params.updelay;
1056 int i;
1057
1058 new_active = bond->curr_active_slave;
1059
1060 if (!new_active) { /* there were no active slaves left */
1061 if (bond->slave_cnt > 0) /* found one slave */
1062 new_active = bond->first_slave;
1063 else
1064 return NULL; /* still no slave, return NULL */
1065 }
1066
1067 if ((bond->primary_slave) &&
1068 bond->primary_slave->link == BOND_LINK_UP &&
1069 bond_should_change_active(bond)) {
1070 new_active = bond->primary_slave;
1071 }
1072
1073 /* remember where to stop iterating over the slaves */
1074 old_active = new_active;
1075
1076 bond_for_each_slave_from(bond, new_active, i, old_active) {
1077 if (new_active->link == BOND_LINK_UP) {
1078 return new_active;
1079 } else if (new_active->link == BOND_LINK_BACK &&
1080 IS_UP(new_active->dev)) {
1081 /* link up, but waiting for stabilization */
1082 if (new_active->delay < mintime) {
1083 mintime = new_active->delay;
1084 bestslave = new_active;
1085 }
1086 }
1087 }
1088
1089 return bestslave;
1090 }
1091
1092 /**
1093 * change_active_interface - change the active slave into the specified one
1094 * @bond: our bonding struct
1095 * @new: the new slave to make the active one
1096 *
1097 * Set the new slave to the bond's settings and unset them on the old
1098 * curr_active_slave.
1099 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1100 *
1101 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1102 * because it is apparently the best available slave we have, even though its
1103 * updelay hasn't timed out yet.
1104 *
1105 * If new_active is not NULL, caller must hold bond->lock for read and
1106 * curr_slave_lock for write_bh.
1107 */
1108 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1109 {
1110 struct slave *old_active = bond->curr_active_slave;
1111
1112 if (old_active == new_active)
1113 return;
1114
1115 if (new_active) {
1116 new_active->jiffies = jiffies;
1117
1118 if (new_active->link == BOND_LINK_BACK) {
1119 if (USES_PRIMARY(bond->params.mode)) {
1120 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1121 bond->dev->name, new_active->dev->name,
1122 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1123 }
1124
1125 new_active->delay = 0;
1126 new_active->link = BOND_LINK_UP;
1127
1128 if (bond->params.mode == BOND_MODE_8023AD)
1129 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1130
1131 if (bond_is_lb(bond))
1132 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1133 } else {
1134 if (USES_PRIMARY(bond->params.mode)) {
1135 pr_info("%s: making interface %s the new active one.\n",
1136 bond->dev->name, new_active->dev->name);
1137 }
1138 }
1139 }
1140
1141 if (USES_PRIMARY(bond->params.mode))
1142 bond_mc_swap(bond, new_active, old_active);
1143
1144 if (bond_is_lb(bond)) {
1145 bond_alb_handle_active_change(bond, new_active);
1146 if (old_active)
1147 bond_set_slave_inactive_flags(old_active);
1148 if (new_active)
1149 bond_set_slave_active_flags(new_active);
1150 } else {
1151 bond->curr_active_slave = new_active;
1152 }
1153
1154 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1155 if (old_active)
1156 bond_set_slave_inactive_flags(old_active);
1157
1158 if (new_active) {
1159 bond_set_slave_active_flags(new_active);
1160
1161 if (bond->params.fail_over_mac)
1162 bond_do_fail_over_mac(bond, new_active,
1163 old_active);
1164
1165 if (netif_running(bond->dev)) {
1166 bond->send_grat_arp = bond->params.num_grat_arp;
1167 bond_send_gratuitous_arp(bond);
1168
1169 bond->send_unsol_na = bond->params.num_unsol_na;
1170 bond_send_unsolicited_na(bond);
1171 }
1172
1173 write_unlock_bh(&bond->curr_slave_lock);
1174 read_unlock(&bond->lock);
1175
1176 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1177
1178 read_lock(&bond->lock);
1179 write_lock_bh(&bond->curr_slave_lock);
1180 }
1181 }
1182
1183 /* resend IGMP joins since active slave has changed or
1184 * all were sent on curr_active_slave */
1185 if (((USES_PRIMARY(bond->params.mode) && new_active) ||
1186 bond->params.mode == BOND_MODE_ROUNDROBIN) &&
1187 netif_running(bond->dev)) {
1188 bond->igmp_retrans = bond->params.resend_igmp;
1189 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1190 }
1191 }
1192
1193 /**
1194 * bond_select_active_slave - select a new active slave, if needed
1195 * @bond: our bonding struct
1196 *
1197 * This functions should be called when one of the following occurs:
1198 * - The old curr_active_slave has been released or lost its link.
1199 * - The primary_slave has got its link back.
1200 * - A slave has got its link back and there's no old curr_active_slave.
1201 *
1202 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1203 */
1204 void bond_select_active_slave(struct bonding *bond)
1205 {
1206 struct slave *best_slave;
1207 int rv;
1208
1209 best_slave = bond_find_best_slave(bond);
1210 if (best_slave != bond->curr_active_slave) {
1211 bond_change_active_slave(bond, best_slave);
1212 rv = bond_set_carrier(bond);
1213 if (!rv)
1214 return;
1215
1216 if (netif_carrier_ok(bond->dev)) {
1217 pr_info("%s: first active interface up!\n",
1218 bond->dev->name);
1219 } else {
1220 pr_info("%s: now running without any active interface !\n",
1221 bond->dev->name);
1222 }
1223 }
1224 }
1225
1226 /*--------------------------- slave list handling ---------------------------*/
1227
1228 /*
1229 * This function attaches the slave to the end of list.
1230 *
1231 * bond->lock held for writing by caller.
1232 */
1233 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1234 {
1235 if (bond->first_slave == NULL) { /* attaching the first slave */
1236 new_slave->next = new_slave;
1237 new_slave->prev = new_slave;
1238 bond->first_slave = new_slave;
1239 } else {
1240 new_slave->next = bond->first_slave;
1241 new_slave->prev = bond->first_slave->prev;
1242 new_slave->next->prev = new_slave;
1243 new_slave->prev->next = new_slave;
1244 }
1245
1246 bond->slave_cnt++;
1247 }
1248
1249 /*
1250 * This function detaches the slave from the list.
1251 * WARNING: no check is made to verify if the slave effectively
1252 * belongs to <bond>.
1253 * Nothing is freed on return, structures are just unchained.
1254 * If any slave pointer in bond was pointing to <slave>,
1255 * it should be changed by the calling function.
1256 *
1257 * bond->lock held for writing by caller.
1258 */
1259 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1260 {
1261 if (slave->next)
1262 slave->next->prev = slave->prev;
1263
1264 if (slave->prev)
1265 slave->prev->next = slave->next;
1266
1267 if (bond->first_slave == slave) { /* slave is the first slave */
1268 if (bond->slave_cnt > 1) { /* there are more slave */
1269 bond->first_slave = slave->next;
1270 } else {
1271 bond->first_slave = NULL; /* slave was the last one */
1272 }
1273 }
1274
1275 slave->next = NULL;
1276 slave->prev = NULL;
1277 bond->slave_cnt--;
1278 }
1279
1280 #ifdef CONFIG_NET_POLL_CONTROLLER
1281 static inline int slave_enable_netpoll(struct slave *slave)
1282 {
1283 struct netpoll *np;
1284 int err = 0;
1285
1286 np = kzalloc(sizeof(*np), GFP_KERNEL);
1287 err = -ENOMEM;
1288 if (!np)
1289 goto out;
1290
1291 np->dev = slave->dev;
1292 err = __netpoll_setup(np);
1293 if (err) {
1294 kfree(np);
1295 goto out;
1296 }
1297 slave->np = np;
1298 out:
1299 return err;
1300 }
1301 static inline void slave_disable_netpoll(struct slave *slave)
1302 {
1303 struct netpoll *np = slave->np;
1304
1305 if (!np)
1306 return;
1307
1308 slave->np = NULL;
1309 synchronize_rcu_bh();
1310 __netpoll_cleanup(np);
1311 kfree(np);
1312 }
1313 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1314 {
1315 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1316 return false;
1317 if (!slave_dev->netdev_ops->ndo_poll_controller)
1318 return false;
1319 return true;
1320 }
1321
1322 static void bond_poll_controller(struct net_device *bond_dev)
1323 {
1324 }
1325
1326 static void __bond_netpoll_cleanup(struct bonding *bond)
1327 {
1328 struct slave *slave;
1329 int i;
1330
1331 bond_for_each_slave(bond, slave, i)
1332 if (IS_UP(slave->dev))
1333 slave_disable_netpoll(slave);
1334 }
1335 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1336 {
1337 struct bonding *bond = netdev_priv(bond_dev);
1338
1339 read_lock(&bond->lock);
1340 __bond_netpoll_cleanup(bond);
1341 read_unlock(&bond->lock);
1342 }
1343
1344 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1345 {
1346 struct bonding *bond = netdev_priv(dev);
1347 struct slave *slave;
1348 int i, err = 0;
1349
1350 read_lock(&bond->lock);
1351 bond_for_each_slave(bond, slave, i) {
1352 err = slave_enable_netpoll(slave);
1353 if (err) {
1354 __bond_netpoll_cleanup(bond);
1355 break;
1356 }
1357 }
1358 read_unlock(&bond->lock);
1359 return err;
1360 }
1361
1362 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1363 {
1364 return bond->dev->npinfo;
1365 }
1366
1367 #else
1368 static inline int slave_enable_netpoll(struct slave *slave)
1369 {
1370 return 0;
1371 }
1372 static inline void slave_disable_netpoll(struct slave *slave)
1373 {
1374 }
1375 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1376 {
1377 }
1378 #endif
1379
1380 /*---------------------------------- IOCTL ----------------------------------*/
1381
1382 static int bond_sethwaddr(struct net_device *bond_dev,
1383 struct net_device *slave_dev)
1384 {
1385 pr_debug("bond_dev=%p\n", bond_dev);
1386 pr_debug("slave_dev=%p\n", slave_dev);
1387 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1388 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1389 return 0;
1390 }
1391
1392 #define BOND_VLAN_FEATURES \
1393 (NETIF_F_VLAN_CHALLENGED | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX | \
1394 NETIF_F_HW_VLAN_FILTER)
1395
1396 /*
1397 * Compute the common dev->feature set available to all slaves. Some
1398 * feature bits are managed elsewhere, so preserve those feature bits
1399 * on the master device.
1400 */
1401 static int bond_compute_features(struct bonding *bond)
1402 {
1403 struct slave *slave;
1404 struct net_device *bond_dev = bond->dev;
1405 u32 features = bond_dev->features;
1406 u32 vlan_features = 0;
1407 unsigned short max_hard_header_len = max((u16)ETH_HLEN,
1408 bond_dev->hard_header_len);
1409 int i;
1410
1411 features &= ~(NETIF_F_ALL_CSUM | BOND_VLAN_FEATURES);
1412 features |= NETIF_F_GSO_MASK | NETIF_F_NO_CSUM | NETIF_F_NOCACHE_COPY;
1413
1414 if (!bond->first_slave)
1415 goto done;
1416
1417 features &= ~NETIF_F_ONE_FOR_ALL;
1418
1419 vlan_features = bond->first_slave->dev->vlan_features;
1420 bond_for_each_slave(bond, slave, i) {
1421 features = netdev_increment_features(features,
1422 slave->dev->features,
1423 NETIF_F_ONE_FOR_ALL);
1424 vlan_features = netdev_increment_features(vlan_features,
1425 slave->dev->vlan_features,
1426 NETIF_F_ONE_FOR_ALL);
1427 if (slave->dev->hard_header_len > max_hard_header_len)
1428 max_hard_header_len = slave->dev->hard_header_len;
1429 }
1430
1431 done:
1432 features |= (bond_dev->features & BOND_VLAN_FEATURES);
1433 bond_dev->features = netdev_fix_features(bond_dev, features);
1434 bond_dev->vlan_features = netdev_fix_features(bond_dev, vlan_features);
1435 bond_dev->hard_header_len = max_hard_header_len;
1436
1437 return 0;
1438 }
1439
1440 static void bond_setup_by_slave(struct net_device *bond_dev,
1441 struct net_device *slave_dev)
1442 {
1443 struct bonding *bond = netdev_priv(bond_dev);
1444
1445 bond_dev->header_ops = slave_dev->header_ops;
1446
1447 bond_dev->type = slave_dev->type;
1448 bond_dev->hard_header_len = slave_dev->hard_header_len;
1449 bond_dev->addr_len = slave_dev->addr_len;
1450
1451 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1452 slave_dev->addr_len);
1453 bond->setup_by_slave = 1;
1454 }
1455
1456 /* On bonding slaves other than the currently active slave, suppress
1457 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
1458 * ARP on active-backup slaves with arp_validate enabled.
1459 */
1460 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1461 struct slave *slave,
1462 struct bonding *bond)
1463 {
1464 if (bond_is_slave_inactive(slave)) {
1465 if (slave_do_arp_validate(bond, slave) &&
1466 skb->protocol == __cpu_to_be16(ETH_P_ARP))
1467 return false;
1468
1469 if (bond->params.mode == BOND_MODE_ALB &&
1470 skb->pkt_type != PACKET_BROADCAST &&
1471 skb->pkt_type != PACKET_MULTICAST)
1472 return false;
1473
1474 if (bond->params.mode == BOND_MODE_8023AD &&
1475 skb->protocol == __cpu_to_be16(ETH_P_SLOW))
1476 return false;
1477
1478 return true;
1479 }
1480 return false;
1481 }
1482
1483 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1484 {
1485 struct sk_buff *skb = *pskb;
1486 struct slave *slave;
1487 struct bonding *bond;
1488
1489 skb = skb_share_check(skb, GFP_ATOMIC);
1490 if (unlikely(!skb))
1491 return RX_HANDLER_CONSUMED;
1492
1493 *pskb = skb;
1494
1495 slave = bond_slave_get_rcu(skb->dev);
1496 bond = slave->bond;
1497
1498 if (bond->params.arp_interval)
1499 slave->dev->last_rx = jiffies;
1500
1501 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1502 return RX_HANDLER_EXACT;
1503 }
1504
1505 skb->dev = bond->dev;
1506
1507 if (bond->params.mode == BOND_MODE_ALB &&
1508 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1509 skb->pkt_type == PACKET_HOST) {
1510
1511 if (unlikely(skb_cow_head(skb,
1512 skb->data - skb_mac_header(skb)))) {
1513 kfree_skb(skb);
1514 return RX_HANDLER_CONSUMED;
1515 }
1516 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1517 }
1518
1519 return RX_HANDLER_ANOTHER;
1520 }
1521
1522 /* enslave device <slave> to bond device <master> */
1523 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1524 {
1525 struct bonding *bond = netdev_priv(bond_dev);
1526 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1527 struct slave *new_slave = NULL;
1528 struct netdev_hw_addr *ha;
1529 struct sockaddr addr;
1530 int link_reporting;
1531 int old_features = bond_dev->features;
1532 int res = 0;
1533
1534 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1535 slave_ops->ndo_do_ioctl == NULL) {
1536 pr_warning("%s: Warning: no link monitoring support for %s\n",
1537 bond_dev->name, slave_dev->name);
1538 }
1539
1540 /* bond must be initialized by bond_open() before enslaving */
1541 if (!(bond_dev->flags & IFF_UP)) {
1542 pr_warning("%s: master_dev is not up in bond_enslave\n",
1543 bond_dev->name);
1544 }
1545
1546 /* already enslaved */
1547 if (slave_dev->flags & IFF_SLAVE) {
1548 pr_debug("Error, Device was already enslaved\n");
1549 return -EBUSY;
1550 }
1551
1552 /* vlan challenged mutual exclusion */
1553 /* no need to lock since we're protected by rtnl_lock */
1554 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1555 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1556 if (bond->vlgrp) {
1557 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1558 bond_dev->name, slave_dev->name, bond_dev->name);
1559 return -EPERM;
1560 } else {
1561 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1562 bond_dev->name, slave_dev->name,
1563 slave_dev->name, bond_dev->name);
1564 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
1565 }
1566 } else {
1567 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1568 if (bond->slave_cnt == 0) {
1569 /* First slave, and it is not VLAN challenged,
1570 * so remove the block of adding VLANs over the bond.
1571 */
1572 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
1573 }
1574 }
1575
1576 /*
1577 * Old ifenslave binaries are no longer supported. These can
1578 * be identified with moderate accuracy by the state of the slave:
1579 * the current ifenslave will set the interface down prior to
1580 * enslaving it; the old ifenslave will not.
1581 */
1582 if ((slave_dev->flags & IFF_UP)) {
1583 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1584 slave_dev->name);
1585 res = -EPERM;
1586 goto err_undo_flags;
1587 }
1588
1589 /* set bonding device ether type by slave - bonding netdevices are
1590 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1591 * there is a need to override some of the type dependent attribs/funcs.
1592 *
1593 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1594 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1595 */
1596 if (bond->slave_cnt == 0) {
1597 if (bond_dev->type != slave_dev->type) {
1598 pr_debug("%s: change device type from %d to %d\n",
1599 bond_dev->name,
1600 bond_dev->type, slave_dev->type);
1601
1602 res = netdev_bonding_change(bond_dev,
1603 NETDEV_PRE_TYPE_CHANGE);
1604 res = notifier_to_errno(res);
1605 if (res) {
1606 pr_err("%s: refused to change device type\n",
1607 bond_dev->name);
1608 res = -EBUSY;
1609 goto err_undo_flags;
1610 }
1611
1612 /* Flush unicast and multicast addresses */
1613 dev_uc_flush(bond_dev);
1614 dev_mc_flush(bond_dev);
1615
1616 if (slave_dev->type != ARPHRD_ETHER)
1617 bond_setup_by_slave(bond_dev, slave_dev);
1618 else
1619 ether_setup(bond_dev);
1620
1621 netdev_bonding_change(bond_dev,
1622 NETDEV_POST_TYPE_CHANGE);
1623 }
1624 } else if (bond_dev->type != slave_dev->type) {
1625 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1626 slave_dev->name,
1627 slave_dev->type, bond_dev->type);
1628 res = -EINVAL;
1629 goto err_undo_flags;
1630 }
1631
1632 if (slave_ops->ndo_set_mac_address == NULL) {
1633 if (bond->slave_cnt == 0) {
1634 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1635 bond_dev->name);
1636 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1637 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1638 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",
1639 bond_dev->name);
1640 res = -EOPNOTSUPP;
1641 goto err_undo_flags;
1642 }
1643 }
1644
1645 /* If this is the first slave, then we need to set the master's hardware
1646 * address to be the same as the slave's. */
1647 if (is_zero_ether_addr(bond->dev->dev_addr))
1648 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1649 slave_dev->addr_len);
1650
1651
1652 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1653 if (!new_slave) {
1654 res = -ENOMEM;
1655 goto err_undo_flags;
1656 }
1657
1658 /*
1659 * Set the new_slave's queue_id to be zero. Queue ID mapping
1660 * is set via sysfs or module option if desired.
1661 */
1662 new_slave->queue_id = 0;
1663
1664 /* Save slave's original mtu and then set it to match the bond */
1665 new_slave->original_mtu = slave_dev->mtu;
1666 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1667 if (res) {
1668 pr_debug("Error %d calling dev_set_mtu\n", res);
1669 goto err_free;
1670 }
1671
1672 /*
1673 * Save slave's original ("permanent") mac address for modes
1674 * that need it, and for restoring it upon release, and then
1675 * set it to the master's address
1676 */
1677 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1678
1679 if (!bond->params.fail_over_mac) {
1680 /*
1681 * Set slave to master's mac address. The application already
1682 * set the master's mac address to that of the first slave
1683 */
1684 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1685 addr.sa_family = slave_dev->type;
1686 res = dev_set_mac_address(slave_dev, &addr);
1687 if (res) {
1688 pr_debug("Error %d calling set_mac_address\n", res);
1689 goto err_restore_mtu;
1690 }
1691 }
1692
1693 res = netdev_set_bond_master(slave_dev, bond_dev);
1694 if (res) {
1695 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1696 goto err_restore_mac;
1697 }
1698
1699 /* open the slave since the application closed it */
1700 res = dev_open(slave_dev);
1701 if (res) {
1702 pr_debug("Opening slave %s failed\n", slave_dev->name);
1703 goto err_unset_master;
1704 }
1705
1706 new_slave->bond = bond;
1707 new_slave->dev = slave_dev;
1708 slave_dev->priv_flags |= IFF_BONDING;
1709
1710 if (bond_is_lb(bond)) {
1711 /* bond_alb_init_slave() must be called before all other stages since
1712 * it might fail and we do not want to have to undo everything
1713 */
1714 res = bond_alb_init_slave(bond, new_slave);
1715 if (res)
1716 goto err_close;
1717 }
1718
1719 /* If the mode USES_PRIMARY, then the new slave gets the
1720 * master's promisc (and mc) settings only if it becomes the
1721 * curr_active_slave, and that is taken care of later when calling
1722 * bond_change_active()
1723 */
1724 if (!USES_PRIMARY(bond->params.mode)) {
1725 /* set promiscuity level to new slave */
1726 if (bond_dev->flags & IFF_PROMISC) {
1727 res = dev_set_promiscuity(slave_dev, 1);
1728 if (res)
1729 goto err_close;
1730 }
1731
1732 /* set allmulti level to new slave */
1733 if (bond_dev->flags & IFF_ALLMULTI) {
1734 res = dev_set_allmulti(slave_dev, 1);
1735 if (res)
1736 goto err_close;
1737 }
1738
1739 netif_addr_lock_bh(bond_dev);
1740 /* upload master's mc_list to new slave */
1741 netdev_for_each_mc_addr(ha, bond_dev)
1742 dev_mc_add(slave_dev, ha->addr);
1743 netif_addr_unlock_bh(bond_dev);
1744 }
1745
1746 if (bond->params.mode == BOND_MODE_8023AD) {
1747 /* add lacpdu mc addr to mc list */
1748 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1749
1750 dev_mc_add(slave_dev, lacpdu_multicast);
1751 }
1752
1753 bond_add_vlans_on_slave(bond, slave_dev);
1754
1755 write_lock_bh(&bond->lock);
1756
1757 bond_attach_slave(bond, new_slave);
1758
1759 new_slave->delay = 0;
1760 new_slave->link_failure_count = 0;
1761
1762 bond_compute_features(bond);
1763
1764 write_unlock_bh(&bond->lock);
1765
1766 read_lock(&bond->lock);
1767
1768 new_slave->last_arp_rx = jiffies;
1769
1770 if (bond->params.miimon && !bond->params.use_carrier) {
1771 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1772
1773 if ((link_reporting == -1) && !bond->params.arp_interval) {
1774 /*
1775 * miimon is set but a bonded network driver
1776 * does not support ETHTOOL/MII and
1777 * arp_interval is not set. Note: if
1778 * use_carrier is enabled, we will never go
1779 * here (because netif_carrier is always
1780 * supported); thus, we don't need to change
1781 * the messages for netif_carrier.
1782 */
1783 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",
1784 bond_dev->name, slave_dev->name);
1785 } else if (link_reporting == -1) {
1786 /* unable get link status using mii/ethtool */
1787 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",
1788 bond_dev->name, slave_dev->name);
1789 }
1790 }
1791
1792 /* check for initial state */
1793 if (!bond->params.miimon ||
1794 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1795 if (bond->params.updelay) {
1796 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1797 new_slave->link = BOND_LINK_BACK;
1798 new_slave->delay = bond->params.updelay;
1799 } else {
1800 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1801 new_slave->link = BOND_LINK_UP;
1802 }
1803 new_slave->jiffies = jiffies;
1804 } else {
1805 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1806 new_slave->link = BOND_LINK_DOWN;
1807 }
1808
1809 if (bond_update_speed_duplex(new_slave) &&
1810 (new_slave->link != BOND_LINK_DOWN)) {
1811 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1812 bond_dev->name, new_slave->dev->name);
1813
1814 if (bond->params.mode == BOND_MODE_8023AD) {
1815 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1816 bond_dev->name);
1817 }
1818 }
1819
1820 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1821 /* if there is a primary slave, remember it */
1822 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1823 bond->primary_slave = new_slave;
1824 bond->force_primary = true;
1825 }
1826 }
1827
1828 write_lock_bh(&bond->curr_slave_lock);
1829
1830 switch (bond->params.mode) {
1831 case BOND_MODE_ACTIVEBACKUP:
1832 bond_set_slave_inactive_flags(new_slave);
1833 bond_select_active_slave(bond);
1834 break;
1835 case BOND_MODE_8023AD:
1836 /* in 802.3ad mode, the internal mechanism
1837 * will activate the slaves in the selected
1838 * aggregator
1839 */
1840 bond_set_slave_inactive_flags(new_slave);
1841 /* if this is the first slave */
1842 if (bond->slave_cnt == 1) {
1843 SLAVE_AD_INFO(new_slave).id = 1;
1844 /* Initialize AD with the number of times that the AD timer is called in 1 second
1845 * can be called only after the mac address of the bond is set
1846 */
1847 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL,
1848 bond->params.lacp_fast);
1849 } else {
1850 SLAVE_AD_INFO(new_slave).id =
1851 SLAVE_AD_INFO(new_slave->prev).id + 1;
1852 }
1853
1854 bond_3ad_bind_slave(new_slave);
1855 break;
1856 case BOND_MODE_TLB:
1857 case BOND_MODE_ALB:
1858 bond_set_active_slave(new_slave);
1859 bond_set_slave_inactive_flags(new_slave);
1860 bond_select_active_slave(bond);
1861 break;
1862 default:
1863 pr_debug("This slave is always active in trunk mode\n");
1864
1865 /* always active in trunk mode */
1866 bond_set_active_slave(new_slave);
1867
1868 /* In trunking mode there is little meaning to curr_active_slave
1869 * anyway (it holds no special properties of the bond device),
1870 * so we can change it without calling change_active_interface()
1871 */
1872 if (!bond->curr_active_slave)
1873 bond->curr_active_slave = new_slave;
1874
1875 break;
1876 } /* switch(bond_mode) */
1877
1878 write_unlock_bh(&bond->curr_slave_lock);
1879
1880 bond_set_carrier(bond);
1881
1882 #ifdef CONFIG_NET_POLL_CONTROLLER
1883 slave_dev->npinfo = bond_netpoll_info(bond);
1884 if (slave_dev->npinfo) {
1885 if (slave_enable_netpoll(new_slave)) {
1886 read_unlock(&bond->lock);
1887 pr_info("Error, %s: master_dev is using netpoll, "
1888 "but new slave device does not support netpoll.\n",
1889 bond_dev->name);
1890 res = -EBUSY;
1891 goto err_close;
1892 }
1893 }
1894 #endif
1895
1896 read_unlock(&bond->lock);
1897
1898 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1899 if (res)
1900 goto err_close;
1901
1902 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1903 new_slave);
1904 if (res) {
1905 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1906 goto err_dest_symlinks;
1907 }
1908
1909 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1910 bond_dev->name, slave_dev->name,
1911 bond_is_active_slave(new_slave) ? "n active" : " backup",
1912 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1913
1914 /* enslave is successful */
1915 return 0;
1916
1917 /* Undo stages on error */
1918 err_dest_symlinks:
1919 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1920
1921 err_close:
1922 dev_close(slave_dev);
1923
1924 err_unset_master:
1925 netdev_set_bond_master(slave_dev, NULL);
1926
1927 err_restore_mac:
1928 if (!bond->params.fail_over_mac) {
1929 /* XXX TODO - fom follow mode needs to change master's
1930 * MAC if this slave's MAC is in use by the bond, or at
1931 * least print a warning.
1932 */
1933 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1934 addr.sa_family = slave_dev->type;
1935 dev_set_mac_address(slave_dev, &addr);
1936 }
1937
1938 err_restore_mtu:
1939 dev_set_mtu(slave_dev, new_slave->original_mtu);
1940
1941 err_free:
1942 kfree(new_slave);
1943
1944 err_undo_flags:
1945 bond_dev->features = old_features;
1946
1947 return res;
1948 }
1949
1950 /*
1951 * Try to release the slave device <slave> from the bond device <master>
1952 * It is legal to access curr_active_slave without a lock because all the function
1953 * is write-locked.
1954 *
1955 * The rules for slave state should be:
1956 * for Active/Backup:
1957 * Active stays on all backups go down
1958 * for Bonded connections:
1959 * The first up interface should be left on and all others downed.
1960 */
1961 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1962 {
1963 struct bonding *bond = netdev_priv(bond_dev);
1964 struct slave *slave, *oldcurrent;
1965 struct sockaddr addr;
1966
1967 /* slave is not a slave or master is not master of this slave */
1968 if (!(slave_dev->flags & IFF_SLAVE) ||
1969 (slave_dev->master != bond_dev)) {
1970 pr_err("%s: Error: cannot release %s.\n",
1971 bond_dev->name, slave_dev->name);
1972 return -EINVAL;
1973 }
1974
1975 block_netpoll_tx();
1976 netdev_bonding_change(bond_dev, NETDEV_BONDING_DESLAVE);
1977 write_lock_bh(&bond->lock);
1978
1979 slave = bond_get_slave_by_dev(bond, slave_dev);
1980 if (!slave) {
1981 /* not a slave of this bond */
1982 pr_info("%s: %s not enslaved\n",
1983 bond_dev->name, slave_dev->name);
1984 write_unlock_bh(&bond->lock);
1985 unblock_netpoll_tx();
1986 return -EINVAL;
1987 }
1988
1989 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1990 * for this slave anymore.
1991 */
1992 netdev_rx_handler_unregister(slave_dev);
1993 write_unlock_bh(&bond->lock);
1994 synchronize_net();
1995 write_lock_bh(&bond->lock);
1996
1997 if (!bond->params.fail_over_mac) {
1998 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1999 bond->slave_cnt > 1)
2000 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",
2001 bond_dev->name, slave_dev->name,
2002 slave->perm_hwaddr,
2003 bond_dev->name, slave_dev->name);
2004 }
2005
2006 /* Inform AD package of unbinding of slave. */
2007 if (bond->params.mode == BOND_MODE_8023AD) {
2008 /* must be called before the slave is
2009 * detached from the list
2010 */
2011 bond_3ad_unbind_slave(slave);
2012 }
2013
2014 pr_info("%s: releasing %s interface %s\n",
2015 bond_dev->name,
2016 bond_is_active_slave(slave) ? "active" : "backup",
2017 slave_dev->name);
2018
2019 oldcurrent = bond->curr_active_slave;
2020
2021 bond->current_arp_slave = NULL;
2022
2023 /* release the slave from its bond */
2024 bond_detach_slave(bond, slave);
2025
2026 bond_compute_features(bond);
2027
2028 if (bond->primary_slave == slave)
2029 bond->primary_slave = NULL;
2030
2031 if (oldcurrent == slave)
2032 bond_change_active_slave(bond, NULL);
2033
2034 if (bond_is_lb(bond)) {
2035 /* Must be called only after the slave has been
2036 * detached from the list and the curr_active_slave
2037 * has been cleared (if our_slave == old_current),
2038 * but before a new active slave is selected.
2039 */
2040 write_unlock_bh(&bond->lock);
2041 bond_alb_deinit_slave(bond, slave);
2042 write_lock_bh(&bond->lock);
2043 }
2044
2045 if (oldcurrent == slave) {
2046 /*
2047 * Note that we hold RTNL over this sequence, so there
2048 * is no concern that another slave add/remove event
2049 * will interfere.
2050 */
2051 write_unlock_bh(&bond->lock);
2052 read_lock(&bond->lock);
2053 write_lock_bh(&bond->curr_slave_lock);
2054
2055 bond_select_active_slave(bond);
2056
2057 write_unlock_bh(&bond->curr_slave_lock);
2058 read_unlock(&bond->lock);
2059 write_lock_bh(&bond->lock);
2060 }
2061
2062 if (bond->slave_cnt == 0) {
2063 bond_set_carrier(bond);
2064
2065 /* if the last slave was removed, zero the mac address
2066 * of the master so it will be set by the application
2067 * to the mac address of the first slave
2068 */
2069 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2070
2071 if (!bond->vlgrp) {
2072 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2073 } else {
2074 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2075 bond_dev->name, bond_dev->name);
2076 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2077 bond_dev->name);
2078 }
2079 } else if ((bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2080 !bond_has_challenged_slaves(bond)) {
2081 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2082 bond_dev->name, slave_dev->name, bond_dev->name);
2083 bond_dev->features &= ~NETIF_F_VLAN_CHALLENGED;
2084 }
2085
2086 write_unlock_bh(&bond->lock);
2087 unblock_netpoll_tx();
2088
2089 /* must do this from outside any spinlocks */
2090 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2091
2092 bond_del_vlans_from_slave(bond, slave_dev);
2093
2094 /* If the mode USES_PRIMARY, then we should only remove its
2095 * promisc and mc settings if it was the curr_active_slave, but that was
2096 * already taken care of above when we detached the slave
2097 */
2098 if (!USES_PRIMARY(bond->params.mode)) {
2099 /* unset promiscuity level from slave */
2100 if (bond_dev->flags & IFF_PROMISC)
2101 dev_set_promiscuity(slave_dev, -1);
2102
2103 /* unset allmulti level from slave */
2104 if (bond_dev->flags & IFF_ALLMULTI)
2105 dev_set_allmulti(slave_dev, -1);
2106
2107 /* flush master's mc_list from slave */
2108 netif_addr_lock_bh(bond_dev);
2109 bond_mc_list_flush(bond_dev, slave_dev);
2110 netif_addr_unlock_bh(bond_dev);
2111 }
2112
2113 netdev_set_bond_master(slave_dev, NULL);
2114
2115 slave_disable_netpoll(slave);
2116
2117 /* close slave before restoring its mac address */
2118 dev_close(slave_dev);
2119
2120 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2121 /* restore original ("permanent") mac address */
2122 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2123 addr.sa_family = slave_dev->type;
2124 dev_set_mac_address(slave_dev, &addr);
2125 }
2126
2127 dev_set_mtu(slave_dev, slave->original_mtu);
2128
2129 slave_dev->priv_flags &= ~IFF_BONDING;
2130
2131 kfree(slave);
2132
2133 return 0; /* deletion OK */
2134 }
2135
2136 /*
2137 * First release a slave and then destroy the bond if no more slaves are left.
2138 * Must be under rtnl_lock when this function is called.
2139 */
2140 static int bond_release_and_destroy(struct net_device *bond_dev,
2141 struct net_device *slave_dev)
2142 {
2143 struct bonding *bond = netdev_priv(bond_dev);
2144 int ret;
2145
2146 ret = bond_release(bond_dev, slave_dev);
2147 if ((ret == 0) && (bond->slave_cnt == 0)) {
2148 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2149 pr_info("%s: destroying bond %s.\n",
2150 bond_dev->name, bond_dev->name);
2151 unregister_netdevice(bond_dev);
2152 }
2153 return ret;
2154 }
2155
2156 /*
2157 * This function releases all slaves.
2158 */
2159 static int bond_release_all(struct net_device *bond_dev)
2160 {
2161 struct bonding *bond = netdev_priv(bond_dev);
2162 struct slave *slave;
2163 struct net_device *slave_dev;
2164 struct sockaddr addr;
2165
2166 write_lock_bh(&bond->lock);
2167
2168 netif_carrier_off(bond_dev);
2169
2170 if (bond->slave_cnt == 0)
2171 goto out;
2172
2173 bond->current_arp_slave = NULL;
2174 bond->primary_slave = NULL;
2175 bond_change_active_slave(bond, NULL);
2176
2177 while ((slave = bond->first_slave) != NULL) {
2178 /* Inform AD package of unbinding of slave
2179 * before slave is detached from the list.
2180 */
2181 if (bond->params.mode == BOND_MODE_8023AD)
2182 bond_3ad_unbind_slave(slave);
2183
2184 slave_dev = slave->dev;
2185 bond_detach_slave(bond, slave);
2186
2187 /* now that the slave is detached, unlock and perform
2188 * all the undo steps that should not be called from
2189 * within a lock.
2190 */
2191 write_unlock_bh(&bond->lock);
2192
2193 /* unregister rx_handler early so bond_handle_frame wouldn't
2194 * be called for this slave anymore.
2195 */
2196 netdev_rx_handler_unregister(slave_dev);
2197 synchronize_net();
2198
2199 if (bond_is_lb(bond)) {
2200 /* must be called only after the slave
2201 * has been detached from the list
2202 */
2203 bond_alb_deinit_slave(bond, slave);
2204 }
2205
2206 bond_compute_features(bond);
2207
2208 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2209 bond_del_vlans_from_slave(bond, slave_dev);
2210
2211 /* If the mode USES_PRIMARY, then we should only remove its
2212 * promisc and mc settings if it was the curr_active_slave, but that was
2213 * already taken care of above when we detached the slave
2214 */
2215 if (!USES_PRIMARY(bond->params.mode)) {
2216 /* unset promiscuity level from slave */
2217 if (bond_dev->flags & IFF_PROMISC)
2218 dev_set_promiscuity(slave_dev, -1);
2219
2220 /* unset allmulti level from slave */
2221 if (bond_dev->flags & IFF_ALLMULTI)
2222 dev_set_allmulti(slave_dev, -1);
2223
2224 /* flush master's mc_list from slave */
2225 netif_addr_lock_bh(bond_dev);
2226 bond_mc_list_flush(bond_dev, slave_dev);
2227 netif_addr_unlock_bh(bond_dev);
2228 }
2229
2230 netdev_set_bond_master(slave_dev, NULL);
2231
2232 slave_disable_netpoll(slave);
2233
2234 /* close slave before restoring its mac address */
2235 dev_close(slave_dev);
2236
2237 if (!bond->params.fail_over_mac) {
2238 /* restore original ("permanent") mac address*/
2239 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2240 addr.sa_family = slave_dev->type;
2241 dev_set_mac_address(slave_dev, &addr);
2242 }
2243
2244 kfree(slave);
2245
2246 /* re-acquire the lock before getting the next slave */
2247 write_lock_bh(&bond->lock);
2248 }
2249
2250 /* zero the mac address of the master so it will be
2251 * set by the application to the mac address of the
2252 * first slave
2253 */
2254 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2255
2256 if (!bond->vlgrp) {
2257 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
2258 } else {
2259 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2260 bond_dev->name, bond_dev->name);
2261 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2262 bond_dev->name);
2263 }
2264
2265 pr_info("%s: released all slaves\n", bond_dev->name);
2266
2267 out:
2268 write_unlock_bh(&bond->lock);
2269 return 0;
2270 }
2271
2272 /*
2273 * This function changes the active slave to slave <slave_dev>.
2274 * It returns -EINVAL in the following cases.
2275 * - <slave_dev> is not found in the list.
2276 * - There is not active slave now.
2277 * - <slave_dev> is already active.
2278 * - The link state of <slave_dev> is not BOND_LINK_UP.
2279 * - <slave_dev> is not running.
2280 * In these cases, this function does nothing.
2281 * In the other cases, current_slave pointer is changed and 0 is returned.
2282 */
2283 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2284 {
2285 struct bonding *bond = netdev_priv(bond_dev);
2286 struct slave *old_active = NULL;
2287 struct slave *new_active = NULL;
2288 int res = 0;
2289
2290 if (!USES_PRIMARY(bond->params.mode))
2291 return -EINVAL;
2292
2293 /* Verify that master_dev is indeed the master of slave_dev */
2294 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2295 return -EINVAL;
2296
2297 read_lock(&bond->lock);
2298
2299 read_lock(&bond->curr_slave_lock);
2300 old_active = bond->curr_active_slave;
2301 read_unlock(&bond->curr_slave_lock);
2302
2303 new_active = bond_get_slave_by_dev(bond, slave_dev);
2304
2305 /*
2306 * Changing to the current active: do nothing; return success.
2307 */
2308 if (new_active && (new_active == old_active)) {
2309 read_unlock(&bond->lock);
2310 return 0;
2311 }
2312
2313 if ((new_active) &&
2314 (old_active) &&
2315 (new_active->link == BOND_LINK_UP) &&
2316 IS_UP(new_active->dev)) {
2317 block_netpoll_tx();
2318 write_lock_bh(&bond->curr_slave_lock);
2319 bond_change_active_slave(bond, new_active);
2320 write_unlock_bh(&bond->curr_slave_lock);
2321 unblock_netpoll_tx();
2322 } else
2323 res = -EINVAL;
2324
2325 read_unlock(&bond->lock);
2326
2327 return res;
2328 }
2329
2330 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2331 {
2332 struct bonding *bond = netdev_priv(bond_dev);
2333
2334 info->bond_mode = bond->params.mode;
2335 info->miimon = bond->params.miimon;
2336
2337 read_lock(&bond->lock);
2338 info->num_slaves = bond->slave_cnt;
2339 read_unlock(&bond->lock);
2340
2341 return 0;
2342 }
2343
2344 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2345 {
2346 struct bonding *bond = netdev_priv(bond_dev);
2347 struct slave *slave;
2348 int i, res = -ENODEV;
2349
2350 read_lock(&bond->lock);
2351
2352 bond_for_each_slave(bond, slave, i) {
2353 if (i == (int)info->slave_id) {
2354 res = 0;
2355 strcpy(info->slave_name, slave->dev->name);
2356 info->link = slave->link;
2357 info->state = bond_slave_state(slave);
2358 info->link_failure_count = slave->link_failure_count;
2359 break;
2360 }
2361 }
2362
2363 read_unlock(&bond->lock);
2364
2365 return res;
2366 }
2367
2368 /*-------------------------------- Monitoring -------------------------------*/
2369
2370
2371 static int bond_miimon_inspect(struct bonding *bond)
2372 {
2373 struct slave *slave;
2374 int i, link_state, commit = 0;
2375 bool ignore_updelay;
2376
2377 ignore_updelay = !bond->curr_active_slave ? true : false;
2378
2379 bond_for_each_slave(bond, slave, i) {
2380 slave->new_link = BOND_LINK_NOCHANGE;
2381
2382 link_state = bond_check_dev_link(bond, slave->dev, 0);
2383
2384 switch (slave->link) {
2385 case BOND_LINK_UP:
2386 if (link_state)
2387 continue;
2388
2389 slave->link = BOND_LINK_FAIL;
2390 slave->delay = bond->params.downdelay;
2391 if (slave->delay) {
2392 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2393 bond->dev->name,
2394 (bond->params.mode ==
2395 BOND_MODE_ACTIVEBACKUP) ?
2396 (bond_is_active_slave(slave) ?
2397 "active " : "backup ") : "",
2398 slave->dev->name,
2399 bond->params.downdelay * bond->params.miimon);
2400 }
2401 /*FALLTHRU*/
2402 case BOND_LINK_FAIL:
2403 if (link_state) {
2404 /*
2405 * recovered before downdelay expired
2406 */
2407 slave->link = BOND_LINK_UP;
2408 slave->jiffies = jiffies;
2409 pr_info("%s: link status up again after %d ms for interface %s.\n",
2410 bond->dev->name,
2411 (bond->params.downdelay - slave->delay) *
2412 bond->params.miimon,
2413 slave->dev->name);
2414 continue;
2415 }
2416
2417 if (slave->delay <= 0) {
2418 slave->new_link = BOND_LINK_DOWN;
2419 commit++;
2420 continue;
2421 }
2422
2423 slave->delay--;
2424 break;
2425
2426 case BOND_LINK_DOWN:
2427 if (!link_state)
2428 continue;
2429
2430 slave->link = BOND_LINK_BACK;
2431 slave->delay = bond->params.updelay;
2432
2433 if (slave->delay) {
2434 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2435 bond->dev->name, slave->dev->name,
2436 ignore_updelay ? 0 :
2437 bond->params.updelay *
2438 bond->params.miimon);
2439 }
2440 /*FALLTHRU*/
2441 case BOND_LINK_BACK:
2442 if (!link_state) {
2443 slave->link = BOND_LINK_DOWN;
2444 pr_info("%s: link status down again after %d ms for interface %s.\n",
2445 bond->dev->name,
2446 (bond->params.updelay - slave->delay) *
2447 bond->params.miimon,
2448 slave->dev->name);
2449
2450 continue;
2451 }
2452
2453 if (ignore_updelay)
2454 slave->delay = 0;
2455
2456 if (slave->delay <= 0) {
2457 slave->new_link = BOND_LINK_UP;
2458 commit++;
2459 ignore_updelay = false;
2460 continue;
2461 }
2462
2463 slave->delay--;
2464 break;
2465 }
2466 }
2467
2468 return commit;
2469 }
2470
2471 static void bond_miimon_commit(struct bonding *bond)
2472 {
2473 struct slave *slave;
2474 int i;
2475
2476 bond_for_each_slave(bond, slave, i) {
2477 switch (slave->new_link) {
2478 case BOND_LINK_NOCHANGE:
2479 continue;
2480
2481 case BOND_LINK_UP:
2482 slave->link = BOND_LINK_UP;
2483 slave->jiffies = jiffies;
2484
2485 if (bond->params.mode == BOND_MODE_8023AD) {
2486 /* prevent it from being the active one */
2487 bond_set_backup_slave(slave);
2488 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2489 /* make it immediately active */
2490 bond_set_active_slave(slave);
2491 } else if (slave != bond->primary_slave) {
2492 /* prevent it from being the active one */
2493 bond_set_backup_slave(slave);
2494 }
2495
2496 bond_update_speed_duplex(slave);
2497
2498 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2499 bond->dev->name, slave->dev->name,
2500 slave->speed, slave->duplex ? "full" : "half");
2501
2502 /* notify ad that the link status has changed */
2503 if (bond->params.mode == BOND_MODE_8023AD)
2504 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2505
2506 if (bond_is_lb(bond))
2507 bond_alb_handle_link_change(bond, slave,
2508 BOND_LINK_UP);
2509
2510 if (!bond->curr_active_slave ||
2511 (slave == bond->primary_slave))
2512 goto do_failover;
2513
2514 continue;
2515
2516 case BOND_LINK_DOWN:
2517 if (slave->link_failure_count < UINT_MAX)
2518 slave->link_failure_count++;
2519
2520 slave->link = BOND_LINK_DOWN;
2521
2522 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2523 bond->params.mode == BOND_MODE_8023AD)
2524 bond_set_slave_inactive_flags(slave);
2525
2526 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2527 bond->dev->name, slave->dev->name);
2528
2529 if (bond->params.mode == BOND_MODE_8023AD)
2530 bond_3ad_handle_link_change(slave,
2531 BOND_LINK_DOWN);
2532
2533 if (bond_is_lb(bond))
2534 bond_alb_handle_link_change(bond, slave,
2535 BOND_LINK_DOWN);
2536
2537 if (slave == bond->curr_active_slave)
2538 goto do_failover;
2539
2540 continue;
2541
2542 default:
2543 pr_err("%s: invalid new link %d on slave %s\n",
2544 bond->dev->name, slave->new_link,
2545 slave->dev->name);
2546 slave->new_link = BOND_LINK_NOCHANGE;
2547
2548 continue;
2549 }
2550
2551 do_failover:
2552 ASSERT_RTNL();
2553 block_netpoll_tx();
2554 write_lock_bh(&bond->curr_slave_lock);
2555 bond_select_active_slave(bond);
2556 write_unlock_bh(&bond->curr_slave_lock);
2557 unblock_netpoll_tx();
2558 }
2559
2560 bond_set_carrier(bond);
2561 }
2562
2563 /*
2564 * bond_mii_monitor
2565 *
2566 * Really a wrapper that splits the mii monitor into two phases: an
2567 * inspection, then (if inspection indicates something needs to be done)
2568 * an acquisition of appropriate locks followed by a commit phase to
2569 * implement whatever link state changes are indicated.
2570 */
2571 void bond_mii_monitor(struct work_struct *work)
2572 {
2573 struct bonding *bond = container_of(work, struct bonding,
2574 mii_work.work);
2575
2576 read_lock(&bond->lock);
2577 if (bond->kill_timers)
2578 goto out;
2579
2580 if (bond->slave_cnt == 0)
2581 goto re_arm;
2582
2583 if (bond->send_grat_arp) {
2584 read_lock(&bond->curr_slave_lock);
2585 bond_send_gratuitous_arp(bond);
2586 read_unlock(&bond->curr_slave_lock);
2587 }
2588
2589 if (bond->send_unsol_na) {
2590 read_lock(&bond->curr_slave_lock);
2591 bond_send_unsolicited_na(bond);
2592 read_unlock(&bond->curr_slave_lock);
2593 }
2594
2595 if (bond_miimon_inspect(bond)) {
2596 read_unlock(&bond->lock);
2597 rtnl_lock();
2598 read_lock(&bond->lock);
2599
2600 bond_miimon_commit(bond);
2601
2602 read_unlock(&bond->lock);
2603 rtnl_unlock(); /* might sleep, hold no other locks */
2604 read_lock(&bond->lock);
2605 }
2606
2607 re_arm:
2608 if (bond->params.miimon)
2609 queue_delayed_work(bond->wq, &bond->mii_work,
2610 msecs_to_jiffies(bond->params.miimon));
2611 out:
2612 read_unlock(&bond->lock);
2613 }
2614
2615 static __be32 bond_glean_dev_ip(struct net_device *dev)
2616 {
2617 struct in_device *idev;
2618 struct in_ifaddr *ifa;
2619 __be32 addr = 0;
2620
2621 if (!dev)
2622 return 0;
2623
2624 rcu_read_lock();
2625 idev = __in_dev_get_rcu(dev);
2626 if (!idev)
2627 goto out;
2628
2629 ifa = idev->ifa_list;
2630 if (!ifa)
2631 goto out;
2632
2633 addr = ifa->ifa_local;
2634 out:
2635 rcu_read_unlock();
2636 return addr;
2637 }
2638
2639 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2640 {
2641 struct vlan_entry *vlan;
2642
2643 if (ip == bond->master_ip)
2644 return 1;
2645
2646 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2647 if (ip == vlan->vlan_ip)
2648 return 1;
2649 }
2650
2651 return 0;
2652 }
2653
2654 /*
2655 * We go to the (large) trouble of VLAN tagging ARP frames because
2656 * switches in VLAN mode (especially if ports are configured as
2657 * "native" to a VLAN) might not pass non-tagged frames.
2658 */
2659 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2660 {
2661 struct sk_buff *skb;
2662
2663 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2664 slave_dev->name, dest_ip, src_ip, vlan_id);
2665
2666 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2667 NULL, slave_dev->dev_addr, NULL);
2668
2669 if (!skb) {
2670 pr_err("ARP packet allocation failed\n");
2671 return;
2672 }
2673 if (vlan_id) {
2674 skb = vlan_put_tag(skb, vlan_id);
2675 if (!skb) {
2676 pr_err("failed to insert VLAN tag\n");
2677 return;
2678 }
2679 }
2680 arp_xmit(skb);
2681 }
2682
2683
2684 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2685 {
2686 int i, vlan_id;
2687 __be32 *targets = bond->params.arp_targets;
2688 struct vlan_entry *vlan;
2689 struct net_device *vlan_dev;
2690 struct rtable *rt;
2691
2692 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2693 if (!targets[i])
2694 break;
2695 pr_debug("basa: target %x\n", targets[i]);
2696 if (!bond->vlgrp) {
2697 pr_debug("basa: empty vlan: arp_send\n");
2698 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2699 bond->master_ip, 0);
2700 continue;
2701 }
2702
2703 /*
2704 * If VLANs are configured, we do a route lookup to
2705 * determine which VLAN interface would be used, so we
2706 * can tag the ARP with the proper VLAN tag.
2707 */
2708 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2709 RTO_ONLINK, 0);
2710 if (IS_ERR(rt)) {
2711 if (net_ratelimit()) {
2712 pr_warning("%s: no route to arp_ip_target %pI4\n",
2713 bond->dev->name, &targets[i]);
2714 }
2715 continue;
2716 }
2717
2718 /*
2719 * This target is not on a VLAN
2720 */
2721 if (rt->dst.dev == bond->dev) {
2722 ip_rt_put(rt);
2723 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2724 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2725 bond->master_ip, 0);
2726 continue;
2727 }
2728
2729 vlan_id = 0;
2730 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2731 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
2732 if (vlan_dev == rt->dst.dev) {
2733 vlan_id = vlan->vlan_id;
2734 pr_debug("basa: vlan match on %s %d\n",
2735 vlan_dev->name, vlan_id);
2736 break;
2737 }
2738 }
2739
2740 if (vlan_id) {
2741 ip_rt_put(rt);
2742 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2743 vlan->vlan_ip, vlan_id);
2744 continue;
2745 }
2746
2747 if (net_ratelimit()) {
2748 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2749 bond->dev->name, &targets[i],
2750 rt->dst.dev ? rt->dst.dev->name : "NULL");
2751 }
2752 ip_rt_put(rt);
2753 }
2754 }
2755
2756 /*
2757 * Kick out a gratuitous ARP for an IP on the bonding master plus one
2758 * for each VLAN above us.
2759 *
2760 * Caller must hold curr_slave_lock for read or better
2761 */
2762 static void bond_send_gratuitous_arp(struct bonding *bond)
2763 {
2764 struct slave *slave = bond->curr_active_slave;
2765 struct vlan_entry *vlan;
2766
2767 pr_debug("bond_send_grat_arp: bond %s slave %s\n",
2768 bond->dev->name, slave ? slave->dev->name : "NULL");
2769
2770 if (!slave || !bond->send_grat_arp ||
2771 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
2772 return;
2773
2774 bond->send_grat_arp--;
2775
2776 if (bond->master_ip) {
2777 bond_arp_send(slave->dev, ARPOP_REPLY, bond->master_ip,
2778 bond->master_ip, 0);
2779 }
2780
2781 if (!bond->vlgrp)
2782 return;
2783
2784 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2785 if (vlan->vlan_ip) {
2786 bond_arp_send(slave->dev, ARPOP_REPLY, vlan->vlan_ip,
2787 vlan->vlan_ip, vlan->vlan_id);
2788 }
2789 }
2790 }
2791
2792 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2793 {
2794 int i;
2795 __be32 *targets = bond->params.arp_targets;
2796
2797 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2798 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2799 &sip, &tip, i, &targets[i],
2800 bond_has_this_ip(bond, tip));
2801 if (sip == targets[i]) {
2802 if (bond_has_this_ip(bond, tip))
2803 slave->last_arp_rx = jiffies;
2804 return;
2805 }
2806 }
2807 }
2808
2809 static int bond_arp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
2810 {
2811 struct arphdr *arp;
2812 struct slave *slave;
2813 struct bonding *bond;
2814 unsigned char *arp_ptr;
2815 __be32 sip, tip;
2816
2817 if (dev->priv_flags & IFF_802_1Q_VLAN) {
2818 /*
2819 * When using VLANS and bonding, dev and oriv_dev may be
2820 * incorrect if the physical interface supports VLAN
2821 * acceleration. With this change ARP validation now
2822 * works for hosts only reachable on the VLAN interface.
2823 */
2824 dev = vlan_dev_real_dev(dev);
2825 orig_dev = dev_get_by_index_rcu(dev_net(skb->dev),skb->skb_iif);
2826 }
2827
2828 if (!(dev->priv_flags & IFF_BONDING) || !(dev->flags & IFF_MASTER))
2829 goto out;
2830
2831 bond = netdev_priv(dev);
2832 read_lock(&bond->lock);
2833
2834 pr_debug("bond_arp_rcv: bond %s skb->dev %s orig_dev %s\n",
2835 bond->dev->name, skb->dev ? skb->dev->name : "NULL",
2836 orig_dev ? orig_dev->name : "NULL");
2837
2838 slave = bond_get_slave_by_dev(bond, orig_dev);
2839 if (!slave || !slave_do_arp_validate(bond, slave))
2840 goto out_unlock;
2841
2842 skb = skb_share_check(skb, GFP_ATOMIC);
2843 if (!skb)
2844 goto out_unlock;
2845
2846 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
2847 goto out_unlock;
2848
2849 arp = arp_hdr(skb);
2850 if (arp->ar_hln != dev->addr_len ||
2851 skb->pkt_type == PACKET_OTHERHOST ||
2852 skb->pkt_type == PACKET_LOOPBACK ||
2853 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2854 arp->ar_pro != htons(ETH_P_IP) ||
2855 arp->ar_pln != 4)
2856 goto out_unlock;
2857
2858 arp_ptr = (unsigned char *)(arp + 1);
2859 arp_ptr += dev->addr_len;
2860 memcpy(&sip, arp_ptr, 4);
2861 arp_ptr += 4 + dev->addr_len;
2862 memcpy(&tip, arp_ptr, 4);
2863
2864 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2865 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2866 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2867 &sip, &tip);
2868
2869 /*
2870 * Backup slaves won't see the ARP reply, but do come through
2871 * here for each ARP probe (so we swap the sip/tip to validate
2872 * the probe). In a "redundant switch, common router" type of
2873 * configuration, the ARP probe will (hopefully) travel from
2874 * the active, through one switch, the router, then the other
2875 * switch before reaching the backup.
2876 */
2877 if (bond_is_active_slave(slave))
2878 bond_validate_arp(bond, slave, sip, tip);
2879 else
2880 bond_validate_arp(bond, slave, tip, sip);
2881
2882 out_unlock:
2883 read_unlock(&bond->lock);
2884 out:
2885 dev_kfree_skb(skb);
2886 return NET_RX_SUCCESS;
2887 }
2888
2889 /*
2890 * this function is called regularly to monitor each slave's link
2891 * ensuring that traffic is being sent and received when arp monitoring
2892 * is used in load-balancing mode. if the adapter has been dormant, then an
2893 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2894 * arp monitoring in active backup mode.
2895 */
2896 void bond_loadbalance_arp_mon(struct work_struct *work)
2897 {
2898 struct bonding *bond = container_of(work, struct bonding,
2899 arp_work.work);
2900 struct slave *slave, *oldcurrent;
2901 int do_failover = 0;
2902 int delta_in_ticks;
2903 int i;
2904
2905 read_lock(&bond->lock);
2906
2907 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2908
2909 if (bond->kill_timers)
2910 goto out;
2911
2912 if (bond->slave_cnt == 0)
2913 goto re_arm;
2914
2915 read_lock(&bond->curr_slave_lock);
2916 oldcurrent = bond->curr_active_slave;
2917 read_unlock(&bond->curr_slave_lock);
2918
2919 /* see if any of the previous devices are up now (i.e. they have
2920 * xmt and rcv traffic). the curr_active_slave does not come into
2921 * the picture unless it is null. also, slave->jiffies is not needed
2922 * here because we send an arp on each slave and give a slave as
2923 * long as it needs to get the tx/rx within the delta.
2924 * TODO: what about up/down delay in arp mode? it wasn't here before
2925 * so it can wait
2926 */
2927 bond_for_each_slave(bond, slave, i) {
2928 unsigned long trans_start = dev_trans_start(slave->dev);
2929
2930 if (slave->link != BOND_LINK_UP) {
2931 if (time_in_range(jiffies,
2932 trans_start - delta_in_ticks,
2933 trans_start + delta_in_ticks) &&
2934 time_in_range(jiffies,
2935 slave->dev->last_rx - delta_in_ticks,
2936 slave->dev->last_rx + delta_in_ticks)) {
2937
2938 slave->link = BOND_LINK_UP;
2939 bond_set_active_slave(slave);
2940
2941 /* primary_slave has no meaning in round-robin
2942 * mode. the window of a slave being up and
2943 * curr_active_slave being null after enslaving
2944 * is closed.
2945 */
2946 if (!oldcurrent) {
2947 pr_info("%s: link status definitely up for interface %s, ",
2948 bond->dev->name,
2949 slave->dev->name);
2950 do_failover = 1;
2951 } else {
2952 pr_info("%s: interface %s is now up\n",
2953 bond->dev->name,
2954 slave->dev->name);
2955 }
2956 }
2957 } else {
2958 /* slave->link == BOND_LINK_UP */
2959
2960 /* not all switches will respond to an arp request
2961 * when the source ip is 0, so don't take the link down
2962 * if we don't know our ip yet
2963 */
2964 if (!time_in_range(jiffies,
2965 trans_start - delta_in_ticks,
2966 trans_start + 2 * delta_in_ticks) ||
2967 !time_in_range(jiffies,
2968 slave->dev->last_rx - delta_in_ticks,
2969 slave->dev->last_rx + 2 * delta_in_ticks)) {
2970
2971 slave->link = BOND_LINK_DOWN;
2972 bond_set_backup_slave(slave);
2973
2974 if (slave->link_failure_count < UINT_MAX)
2975 slave->link_failure_count++;
2976
2977 pr_info("%s: interface %s is now down.\n",
2978 bond->dev->name,
2979 slave->dev->name);
2980
2981 if (slave == oldcurrent)
2982 do_failover = 1;
2983 }
2984 }
2985
2986 /* note: if switch is in round-robin mode, all links
2987 * must tx arp to ensure all links rx an arp - otherwise
2988 * links may oscillate or not come up at all; if switch is
2989 * in something like xor mode, there is nothing we can
2990 * do - all replies will be rx'ed on same link causing slaves
2991 * to be unstable during low/no traffic periods
2992 */
2993 if (IS_UP(slave->dev))
2994 bond_arp_send_all(bond, slave);
2995 }
2996
2997 if (do_failover) {
2998 block_netpoll_tx();
2999 write_lock_bh(&bond->curr_slave_lock);
3000
3001 bond_select_active_slave(bond);
3002
3003 write_unlock_bh(&bond->curr_slave_lock);
3004 unblock_netpoll_tx();
3005 }
3006
3007 re_arm:
3008 if (bond->params.arp_interval)
3009 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3010 out:
3011 read_unlock(&bond->lock);
3012 }
3013
3014 /*
3015 * Called to inspect slaves for active-backup mode ARP monitor link state
3016 * changes. Sets new_link in slaves to specify what action should take
3017 * place for the slave. Returns 0 if no changes are found, >0 if changes
3018 * to link states must be committed.
3019 *
3020 * Called with bond->lock held for read.
3021 */
3022 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
3023 {
3024 struct slave *slave;
3025 int i, commit = 0;
3026 unsigned long trans_start;
3027
3028 bond_for_each_slave(bond, slave, i) {
3029 slave->new_link = BOND_LINK_NOCHANGE;
3030
3031 if (slave->link != BOND_LINK_UP) {
3032 if (time_in_range(jiffies,
3033 slave_last_rx(bond, slave) - delta_in_ticks,
3034 slave_last_rx(bond, slave) + delta_in_ticks)) {
3035
3036 slave->new_link = BOND_LINK_UP;
3037 commit++;
3038 }
3039
3040 continue;
3041 }
3042
3043 /*
3044 * Give slaves 2*delta after being enslaved or made
3045 * active. This avoids bouncing, as the last receive
3046 * times need a full ARP monitor cycle to be updated.
3047 */
3048 if (time_in_range(jiffies,
3049 slave->jiffies - delta_in_ticks,
3050 slave->jiffies + 2 * delta_in_ticks))
3051 continue;
3052
3053 /*
3054 * Backup slave is down if:
3055 * - No current_arp_slave AND
3056 * - more than 3*delta since last receive AND
3057 * - the bond has an IP address
3058 *
3059 * Note: a non-null current_arp_slave indicates
3060 * the curr_active_slave went down and we are
3061 * searching for a new one; under this condition
3062 * we only take the curr_active_slave down - this
3063 * gives each slave a chance to tx/rx traffic
3064 * before being taken out
3065 */
3066 if (!bond_is_active_slave(slave) &&
3067 !bond->current_arp_slave &&
3068 !time_in_range(jiffies,
3069 slave_last_rx(bond, slave) - delta_in_ticks,
3070 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
3071
3072 slave->new_link = BOND_LINK_DOWN;
3073 commit++;
3074 }
3075
3076 /*
3077 * Active slave is down if:
3078 * - more than 2*delta since transmitting OR
3079 * - (more than 2*delta since receive AND
3080 * the bond has an IP address)
3081 */
3082 trans_start = dev_trans_start(slave->dev);
3083 if (bond_is_active_slave(slave) &&
3084 (!time_in_range(jiffies,
3085 trans_start - delta_in_ticks,
3086 trans_start + 2 * delta_in_ticks) ||
3087 !time_in_range(jiffies,
3088 slave_last_rx(bond, slave) - delta_in_ticks,
3089 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
3090
3091 slave->new_link = BOND_LINK_DOWN;
3092 commit++;
3093 }
3094 }
3095
3096 return commit;
3097 }
3098
3099 /*
3100 * Called to commit link state changes noted by inspection step of
3101 * active-backup mode ARP monitor.
3102 *
3103 * Called with RTNL and bond->lock for read.
3104 */
3105 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3106 {
3107 struct slave *slave;
3108 int i;
3109 unsigned long trans_start;
3110
3111 bond_for_each_slave(bond, slave, i) {
3112 switch (slave->new_link) {
3113 case BOND_LINK_NOCHANGE:
3114 continue;
3115
3116 case BOND_LINK_UP:
3117 trans_start = dev_trans_start(slave->dev);
3118 if ((!bond->curr_active_slave &&
3119 time_in_range(jiffies,
3120 trans_start - delta_in_ticks,
3121 trans_start + delta_in_ticks)) ||
3122 bond->curr_active_slave != slave) {
3123 slave->link = BOND_LINK_UP;
3124 bond->current_arp_slave = NULL;
3125
3126 pr_info("%s: link status definitely up for interface %s.\n",
3127 bond->dev->name, slave->dev->name);
3128
3129 if (!bond->curr_active_slave ||
3130 (slave == bond->primary_slave))
3131 goto do_failover;
3132
3133 }
3134
3135 continue;
3136
3137 case BOND_LINK_DOWN:
3138 if (slave->link_failure_count < UINT_MAX)
3139 slave->link_failure_count++;
3140
3141 slave->link = BOND_LINK_DOWN;
3142 bond_set_slave_inactive_flags(slave);
3143
3144 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3145 bond->dev->name, slave->dev->name);
3146
3147 if (slave == bond->curr_active_slave) {
3148 bond->current_arp_slave = NULL;
3149 goto do_failover;
3150 }
3151
3152 continue;
3153
3154 default:
3155 pr_err("%s: impossible: new_link %d on slave %s\n",
3156 bond->dev->name, slave->new_link,
3157 slave->dev->name);
3158 continue;
3159 }
3160
3161 do_failover:
3162 ASSERT_RTNL();
3163 block_netpoll_tx();
3164 write_lock_bh(&bond->curr_slave_lock);
3165 bond_select_active_slave(bond);
3166 write_unlock_bh(&bond->curr_slave_lock);
3167 unblock_netpoll_tx();
3168 }
3169
3170 bond_set_carrier(bond);
3171 }
3172
3173 /*
3174 * Send ARP probes for active-backup mode ARP monitor.
3175 *
3176 * Called with bond->lock held for read.
3177 */
3178 static void bond_ab_arp_probe(struct bonding *bond)
3179 {
3180 struct slave *slave;
3181 int i;
3182
3183 read_lock(&bond->curr_slave_lock);
3184
3185 if (bond->current_arp_slave && bond->curr_active_slave)
3186 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3187 bond->current_arp_slave->dev->name,
3188 bond->curr_active_slave->dev->name);
3189
3190 if (bond->curr_active_slave) {
3191 bond_arp_send_all(bond, bond->curr_active_slave);
3192 read_unlock(&bond->curr_slave_lock);
3193 return;
3194 }
3195
3196 read_unlock(&bond->curr_slave_lock);
3197
3198 /* if we don't have a curr_active_slave, search for the next available
3199 * backup slave from the current_arp_slave and make it the candidate
3200 * for becoming the curr_active_slave
3201 */
3202
3203 if (!bond->current_arp_slave) {
3204 bond->current_arp_slave = bond->first_slave;
3205 if (!bond->current_arp_slave)
3206 return;
3207 }
3208
3209 bond_set_slave_inactive_flags(bond->current_arp_slave);
3210
3211 /* search for next candidate */
3212 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3213 if (IS_UP(slave->dev)) {
3214 slave->link = BOND_LINK_BACK;
3215 bond_set_slave_active_flags(slave);
3216 bond_arp_send_all(bond, slave);
3217 slave->jiffies = jiffies;
3218 bond->current_arp_slave = slave;
3219 break;
3220 }
3221
3222 /* if the link state is up at this point, we
3223 * mark it down - this can happen if we have
3224 * simultaneous link failures and
3225 * reselect_active_interface doesn't make this
3226 * one the current slave so it is still marked
3227 * up when it is actually down
3228 */
3229 if (slave->link == BOND_LINK_UP) {
3230 slave->link = BOND_LINK_DOWN;
3231 if (slave->link_failure_count < UINT_MAX)
3232 slave->link_failure_count++;
3233
3234 bond_set_slave_inactive_flags(slave);
3235
3236 pr_info("%s: backup interface %s is now down.\n",
3237 bond->dev->name, slave->dev->name);
3238 }
3239 }
3240 }
3241
3242 void bond_activebackup_arp_mon(struct work_struct *work)
3243 {
3244 struct bonding *bond = container_of(work, struct bonding,
3245 arp_work.work);
3246 int delta_in_ticks;
3247
3248 read_lock(&bond->lock);
3249
3250 if (bond->kill_timers)
3251 goto out;
3252
3253 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3254
3255 if (bond->slave_cnt == 0)
3256 goto re_arm;
3257
3258 if (bond->send_grat_arp) {
3259 read_lock(&bond->curr_slave_lock);
3260 bond_send_gratuitous_arp(bond);
3261 read_unlock(&bond->curr_slave_lock);
3262 }
3263
3264 if (bond->send_unsol_na) {
3265 read_lock(&bond->curr_slave_lock);
3266 bond_send_unsolicited_na(bond);
3267 read_unlock(&bond->curr_slave_lock);
3268 }
3269
3270 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3271 read_unlock(&bond->lock);
3272 rtnl_lock();
3273 read_lock(&bond->lock);
3274
3275 bond_ab_arp_commit(bond, delta_in_ticks);
3276
3277 read_unlock(&bond->lock);
3278 rtnl_unlock();
3279 read_lock(&bond->lock);
3280 }
3281
3282 bond_ab_arp_probe(bond);
3283
3284 re_arm:
3285 if (bond->params.arp_interval)
3286 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3287 out:
3288 read_unlock(&bond->lock);
3289 }
3290
3291 /*-------------------------- netdev event handling --------------------------*/
3292
3293 /*
3294 * Change device name
3295 */
3296 static int bond_event_changename(struct bonding *bond)
3297 {
3298 bond_remove_proc_entry(bond);
3299 bond_create_proc_entry(bond);
3300
3301 bond_debug_reregister(bond);
3302
3303 return NOTIFY_DONE;
3304 }
3305
3306 static int bond_master_netdev_event(unsigned long event,
3307 struct net_device *bond_dev)
3308 {
3309 struct bonding *event_bond = netdev_priv(bond_dev);
3310
3311 switch (event) {
3312 case NETDEV_CHANGENAME:
3313 return bond_event_changename(event_bond);
3314 default:
3315 break;
3316 }
3317
3318 return NOTIFY_DONE;
3319 }
3320
3321 static int bond_slave_netdev_event(unsigned long event,
3322 struct net_device *slave_dev)
3323 {
3324 struct net_device *bond_dev = slave_dev->master;
3325 struct bonding *bond = netdev_priv(bond_dev);
3326
3327 switch (event) {
3328 case NETDEV_UNREGISTER:
3329 if (bond_dev) {
3330 if (bond->setup_by_slave)
3331 bond_release_and_destroy(bond_dev, slave_dev);
3332 else
3333 bond_release(bond_dev, slave_dev);
3334 }
3335 break;
3336 case NETDEV_CHANGE:
3337 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3338 struct slave *slave;
3339
3340 slave = bond_get_slave_by_dev(bond, slave_dev);
3341 if (slave) {
3342 u32 old_speed = slave->speed;
3343 u8 old_duplex = slave->duplex;
3344
3345 bond_update_speed_duplex(slave);
3346
3347 if (bond_is_lb(bond))
3348 break;
3349
3350 if (old_speed != slave->speed)
3351 bond_3ad_adapter_speed_changed(slave);
3352 if (old_duplex != slave->duplex)
3353 bond_3ad_adapter_duplex_changed(slave);
3354 }
3355 }
3356
3357 break;
3358 case NETDEV_DOWN:
3359 /*
3360 * ... Or is it this?
3361 */
3362 break;
3363 case NETDEV_CHANGEMTU:
3364 /*
3365 * TODO: Should slaves be allowed to
3366 * independently alter their MTU? For
3367 * an active-backup bond, slaves need
3368 * not be the same type of device, so
3369 * MTUs may vary. For other modes,
3370 * slaves arguably should have the
3371 * same MTUs. To do this, we'd need to
3372 * take over the slave's change_mtu
3373 * function for the duration of their
3374 * servitude.
3375 */
3376 break;
3377 case NETDEV_CHANGENAME:
3378 /*
3379 * TODO: handle changing the primary's name
3380 */
3381 break;
3382 case NETDEV_FEAT_CHANGE:
3383 bond_compute_features(bond);
3384 break;
3385 default:
3386 break;
3387 }
3388
3389 return NOTIFY_DONE;
3390 }
3391
3392 /*
3393 * bond_netdev_event: handle netdev notifier chain events.
3394 *
3395 * This function receives events for the netdev chain. The caller (an
3396 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3397 * locks for us to safely manipulate the slave devices (RTNL lock,
3398 * dev_probe_lock).
3399 */
3400 static int bond_netdev_event(struct notifier_block *this,
3401 unsigned long event, void *ptr)
3402 {
3403 struct net_device *event_dev = (struct net_device *)ptr;
3404
3405 pr_debug("event_dev: %s, event: %lx\n",
3406 event_dev ? event_dev->name : "None",
3407 event);
3408
3409 if (!(event_dev->priv_flags & IFF_BONDING))
3410 return NOTIFY_DONE;
3411
3412 if (event_dev->flags & IFF_MASTER) {
3413 pr_debug("IFF_MASTER\n");
3414 return bond_master_netdev_event(event, event_dev);
3415 }
3416
3417 if (event_dev->flags & IFF_SLAVE) {
3418 pr_debug("IFF_SLAVE\n");
3419 return bond_slave_netdev_event(event, event_dev);
3420 }
3421
3422 return NOTIFY_DONE;
3423 }
3424
3425 /*
3426 * bond_inetaddr_event: handle inetaddr notifier chain events.
3427 *
3428 * We keep track of device IPs primarily to use as source addresses in
3429 * ARP monitor probes (rather than spewing out broadcasts all the time).
3430 *
3431 * We track one IP for the main device (if it has one), plus one per VLAN.
3432 */
3433 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3434 {
3435 struct in_ifaddr *ifa = ptr;
3436 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3437 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3438 struct bonding *bond;
3439 struct vlan_entry *vlan;
3440
3441 list_for_each_entry(bond, &bn->dev_list, bond_list) {
3442 if (bond->dev == event_dev) {
3443 switch (event) {
3444 case NETDEV_UP:
3445 bond->master_ip = ifa->ifa_local;
3446 return NOTIFY_OK;
3447 case NETDEV_DOWN:
3448 bond->master_ip = bond_glean_dev_ip(bond->dev);
3449 return NOTIFY_OK;
3450 default:
3451 return NOTIFY_DONE;
3452 }
3453 }
3454
3455 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3456 if (!bond->vlgrp)
3457 continue;
3458 vlan_dev = vlan_group_get_device(bond->vlgrp, vlan->vlan_id);
3459 if (vlan_dev == event_dev) {
3460 switch (event) {
3461 case NETDEV_UP:
3462 vlan->vlan_ip = ifa->ifa_local;
3463 return NOTIFY_OK;
3464 case NETDEV_DOWN:
3465 vlan->vlan_ip =
3466 bond_glean_dev_ip(vlan_dev);
3467 return NOTIFY_OK;
3468 default:
3469 return NOTIFY_DONE;
3470 }
3471 }
3472 }
3473 }
3474 return NOTIFY_DONE;
3475 }
3476
3477 static struct notifier_block bond_netdev_notifier = {
3478 .notifier_call = bond_netdev_event,
3479 };
3480
3481 static struct notifier_block bond_inetaddr_notifier = {
3482 .notifier_call = bond_inetaddr_event,
3483 };
3484
3485 /*-------------------------- Packet type handling ---------------------------*/
3486
3487 /* register to receive lacpdus on a bond */
3488 static void bond_register_lacpdu(struct bonding *bond)
3489 {
3490 struct packet_type *pk_type = &(BOND_AD_INFO(bond).ad_pkt_type);
3491
3492 /* initialize packet type */
3493 pk_type->type = PKT_TYPE_LACPDU;
3494 pk_type->dev = bond->dev;
3495 pk_type->func = bond_3ad_lacpdu_recv;
3496
3497 dev_add_pack(pk_type);
3498 }
3499
3500 /* unregister to receive lacpdus on a bond */
3501 static void bond_unregister_lacpdu(struct bonding *bond)
3502 {
3503 dev_remove_pack(&(BOND_AD_INFO(bond).ad_pkt_type));
3504 }
3505
3506 void bond_register_arp(struct bonding *bond)
3507 {
3508 struct packet_type *pt = &bond->arp_mon_pt;
3509
3510 if (pt->type)
3511 return;
3512
3513 pt->type = htons(ETH_P_ARP);
3514 pt->dev = bond->dev;
3515 pt->func = bond_arp_rcv;
3516 dev_add_pack(pt);
3517 }
3518
3519 void bond_unregister_arp(struct bonding *bond)
3520 {
3521 struct packet_type *pt = &bond->arp_mon_pt;
3522
3523 dev_remove_pack(pt);
3524 pt->type = 0;
3525 }
3526
3527 /*---------------------------- Hashing Policies -----------------------------*/
3528
3529 /*
3530 * Hash for the output device based upon layer 2 and layer 3 data. If
3531 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3532 */
3533 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3534 {
3535 struct ethhdr *data = (struct ethhdr *)skb->data;
3536 struct iphdr *iph = ip_hdr(skb);
3537
3538 if (skb->protocol == htons(ETH_P_IP)) {
3539 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3540 (data->h_dest[5] ^ data->h_source[5])) % count;
3541 }
3542
3543 return (data->h_dest[5] ^ data->h_source[5]) % count;
3544 }
3545
3546 /*
3547 * Hash for the output device based upon layer 3 and layer 4 data. If
3548 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3549 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3550 */
3551 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3552 {
3553 struct ethhdr *data = (struct ethhdr *)skb->data;
3554 struct iphdr *iph = ip_hdr(skb);
3555 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3556 int layer4_xor = 0;
3557
3558 if (skb->protocol == htons(ETH_P_IP)) {
3559 if (!(iph->frag_off & htons(IP_MF|IP_OFFSET)) &&
3560 (iph->protocol == IPPROTO_TCP ||
3561 iph->protocol == IPPROTO_UDP)) {
3562 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3563 }
3564 return (layer4_xor ^
3565 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3566
3567 }
3568
3569 return (data->h_dest[5] ^ data->h_source[5]) % count;
3570 }
3571
3572 /*
3573 * Hash for the output device based upon layer 2 data
3574 */
3575 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3576 {
3577 struct ethhdr *data = (struct ethhdr *)skb->data;
3578
3579 return (data->h_dest[5] ^ data->h_source[5]) % count;
3580 }
3581
3582 /*-------------------------- Device entry points ----------------------------*/
3583
3584 static int bond_open(struct net_device *bond_dev)
3585 {
3586 struct bonding *bond = netdev_priv(bond_dev);
3587
3588 bond->kill_timers = 0;
3589
3590 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3591
3592 if (bond_is_lb(bond)) {
3593 /* bond_alb_initialize must be called before the timer
3594 * is started.
3595 */
3596 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3597 /* something went wrong - fail the open operation */
3598 return -ENOMEM;
3599 }
3600
3601 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3602 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3603 }
3604
3605 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3606 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3607 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3608 }
3609
3610 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3611 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3612 INIT_DELAYED_WORK(&bond->arp_work,
3613 bond_activebackup_arp_mon);
3614 else
3615 INIT_DELAYED_WORK(&bond->arp_work,
3616 bond_loadbalance_arp_mon);
3617
3618 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3619 if (bond->params.arp_validate)
3620 bond_register_arp(bond);
3621 }
3622
3623 if (bond->params.mode == BOND_MODE_8023AD) {
3624 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3625 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3626 /* register to receive LACPDUs */
3627 bond_register_lacpdu(bond);
3628 bond_3ad_initiate_agg_selection(bond, 1);
3629 }
3630
3631 return 0;
3632 }
3633
3634 static int bond_close(struct net_device *bond_dev)
3635 {
3636 struct bonding *bond = netdev_priv(bond_dev);
3637
3638 if (bond->params.mode == BOND_MODE_8023AD) {
3639 /* Unregister the receive of LACPDUs */
3640 bond_unregister_lacpdu(bond);
3641 }
3642
3643 if (bond->params.arp_validate)
3644 bond_unregister_arp(bond);
3645
3646 write_lock_bh(&bond->lock);
3647
3648 bond->send_grat_arp = 0;
3649 bond->send_unsol_na = 0;
3650
3651 /* signal timers not to re-arm */
3652 bond->kill_timers = 1;
3653
3654 write_unlock_bh(&bond->lock);
3655
3656 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3657 cancel_delayed_work(&bond->mii_work);
3658 }
3659
3660 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3661 cancel_delayed_work(&bond->arp_work);
3662 }
3663
3664 switch (bond->params.mode) {
3665 case BOND_MODE_8023AD:
3666 cancel_delayed_work(&bond->ad_work);
3667 break;
3668 case BOND_MODE_TLB:
3669 case BOND_MODE_ALB:
3670 cancel_delayed_work(&bond->alb_work);
3671 break;
3672 default:
3673 break;
3674 }
3675
3676 if (delayed_work_pending(&bond->mcast_work))
3677 cancel_delayed_work(&bond->mcast_work);
3678
3679 if (bond_is_lb(bond)) {
3680 /* Must be called only after all
3681 * slaves have been released
3682 */
3683 bond_alb_deinitialize(bond);
3684 }
3685
3686 return 0;
3687 }
3688
3689 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3690 struct rtnl_link_stats64 *stats)
3691 {
3692 struct bonding *bond = netdev_priv(bond_dev);
3693 struct rtnl_link_stats64 temp;
3694 struct slave *slave;
3695 int i;
3696
3697 memset(stats, 0, sizeof(*stats));
3698
3699 read_lock_bh(&bond->lock);
3700
3701 bond_for_each_slave(bond, slave, i) {
3702 const struct rtnl_link_stats64 *sstats =
3703 dev_get_stats(slave->dev, &temp);
3704
3705 stats->rx_packets += sstats->rx_packets;
3706 stats->rx_bytes += sstats->rx_bytes;
3707 stats->rx_errors += sstats->rx_errors;
3708 stats->rx_dropped += sstats->rx_dropped;
3709
3710 stats->tx_packets += sstats->tx_packets;
3711 stats->tx_bytes += sstats->tx_bytes;
3712 stats->tx_errors += sstats->tx_errors;
3713 stats->tx_dropped += sstats->tx_dropped;
3714
3715 stats->multicast += sstats->multicast;
3716 stats->collisions += sstats->collisions;
3717
3718 stats->rx_length_errors += sstats->rx_length_errors;
3719 stats->rx_over_errors += sstats->rx_over_errors;
3720 stats->rx_crc_errors += sstats->rx_crc_errors;
3721 stats->rx_frame_errors += sstats->rx_frame_errors;
3722 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3723 stats->rx_missed_errors += sstats->rx_missed_errors;
3724
3725 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3726 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3727 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3728 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3729 stats->tx_window_errors += sstats->tx_window_errors;
3730 }
3731
3732 read_unlock_bh(&bond->lock);
3733
3734 return stats;
3735 }
3736
3737 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3738 {
3739 struct net_device *slave_dev = NULL;
3740 struct ifbond k_binfo;
3741 struct ifbond __user *u_binfo = NULL;
3742 struct ifslave k_sinfo;
3743 struct ifslave __user *u_sinfo = NULL;
3744 struct mii_ioctl_data *mii = NULL;
3745 int res = 0;
3746
3747 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3748
3749 switch (cmd) {
3750 case SIOCGMIIPHY:
3751 mii = if_mii(ifr);
3752 if (!mii)
3753 return -EINVAL;
3754
3755 mii->phy_id = 0;
3756 /* Fall Through */
3757 case SIOCGMIIREG:
3758 /*
3759 * We do this again just in case we were called by SIOCGMIIREG
3760 * instead of SIOCGMIIPHY.
3761 */
3762 mii = if_mii(ifr);
3763 if (!mii)
3764 return -EINVAL;
3765
3766
3767 if (mii->reg_num == 1) {
3768 struct bonding *bond = netdev_priv(bond_dev);
3769 mii->val_out = 0;
3770 read_lock(&bond->lock);
3771 read_lock(&bond->curr_slave_lock);
3772 if (netif_carrier_ok(bond->dev))
3773 mii->val_out = BMSR_LSTATUS;
3774
3775 read_unlock(&bond->curr_slave_lock);
3776 read_unlock(&bond->lock);
3777 }
3778
3779 return 0;
3780 case BOND_INFO_QUERY_OLD:
3781 case SIOCBONDINFOQUERY:
3782 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3783
3784 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3785 return -EFAULT;
3786
3787 res = bond_info_query(bond_dev, &k_binfo);
3788 if (res == 0 &&
3789 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3790 return -EFAULT;
3791
3792 return res;
3793 case BOND_SLAVE_INFO_QUERY_OLD:
3794 case SIOCBONDSLAVEINFOQUERY:
3795 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3796
3797 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3798 return -EFAULT;
3799
3800 res = bond_slave_info_query(bond_dev, &k_sinfo);
3801 if (res == 0 &&
3802 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3803 return -EFAULT;
3804
3805 return res;
3806 default:
3807 /* Go on */
3808 break;
3809 }
3810
3811 if (!capable(CAP_NET_ADMIN))
3812 return -EPERM;
3813
3814 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3815
3816 pr_debug("slave_dev=%p:\n", slave_dev);
3817
3818 if (!slave_dev)
3819 res = -ENODEV;
3820 else {
3821 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3822 switch (cmd) {
3823 case BOND_ENSLAVE_OLD:
3824 case SIOCBONDENSLAVE:
3825 res = bond_enslave(bond_dev, slave_dev);
3826 break;
3827 case BOND_RELEASE_OLD:
3828 case SIOCBONDRELEASE:
3829 res = bond_release(bond_dev, slave_dev);
3830 break;
3831 case BOND_SETHWADDR_OLD:
3832 case SIOCBONDSETHWADDR:
3833 res = bond_sethwaddr(bond_dev, slave_dev);
3834 break;
3835 case BOND_CHANGE_ACTIVE_OLD:
3836 case SIOCBONDCHANGEACTIVE:
3837 res = bond_ioctl_change_active(bond_dev, slave_dev);
3838 break;
3839 default:
3840 res = -EOPNOTSUPP;
3841 }
3842
3843 dev_put(slave_dev);
3844 }
3845
3846 return res;
3847 }
3848
3849 static bool bond_addr_in_mc_list(unsigned char *addr,
3850 struct netdev_hw_addr_list *list,
3851 int addrlen)
3852 {
3853 struct netdev_hw_addr *ha;
3854
3855 netdev_hw_addr_list_for_each(ha, list)
3856 if (!memcmp(ha->addr, addr, addrlen))
3857 return true;
3858
3859 return false;
3860 }
3861
3862 static void bond_set_multicast_list(struct net_device *bond_dev)
3863 {
3864 struct bonding *bond = netdev_priv(bond_dev);
3865 struct netdev_hw_addr *ha;
3866 bool found;
3867
3868 /*
3869 * Do promisc before checking multicast_mode
3870 */
3871 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
3872 /*
3873 * FIXME: Need to handle the error when one of the multi-slaves
3874 * encounters error.
3875 */
3876 bond_set_promiscuity(bond, 1);
3877
3878
3879 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
3880 bond_set_promiscuity(bond, -1);
3881
3882
3883 /* set allmulti flag to slaves */
3884 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
3885 /*
3886 * FIXME: Need to handle the error when one of the multi-slaves
3887 * encounters error.
3888 */
3889 bond_set_allmulti(bond, 1);
3890
3891
3892 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
3893 bond_set_allmulti(bond, -1);
3894
3895
3896 read_lock(&bond->lock);
3897
3898 bond->flags = bond_dev->flags;
3899
3900 /* looking for addresses to add to slaves' mc list */
3901 netdev_for_each_mc_addr(ha, bond_dev) {
3902 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3903 bond_dev->addr_len);
3904 if (!found)
3905 bond_mc_add(bond, ha->addr);
3906 }
3907
3908 /* looking for addresses to delete from slaves' list */
3909 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3910 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3911 bond_dev->addr_len);
3912 if (!found)
3913 bond_mc_del(bond, ha->addr);
3914 }
3915
3916 /* save master's multicast list */
3917 __hw_addr_flush(&bond->mc_list);
3918 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3919 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3920
3921 read_unlock(&bond->lock);
3922 }
3923
3924 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3925 {
3926 struct bonding *bond = netdev_priv(dev);
3927 struct slave *slave = bond->first_slave;
3928
3929 if (slave) {
3930 const struct net_device_ops *slave_ops
3931 = slave->dev->netdev_ops;
3932 if (slave_ops->ndo_neigh_setup)
3933 return slave_ops->ndo_neigh_setup(slave->dev, parms);
3934 }
3935 return 0;
3936 }
3937
3938 /*
3939 * Change the MTU of all of a master's slaves to match the master
3940 */
3941 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3942 {
3943 struct bonding *bond = netdev_priv(bond_dev);
3944 struct slave *slave, *stop_at;
3945 int res = 0;
3946 int i;
3947
3948 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3949 (bond_dev ? bond_dev->name : "None"), new_mtu);
3950
3951 /* Can't hold bond->lock with bh disabled here since
3952 * some base drivers panic. On the other hand we can't
3953 * hold bond->lock without bh disabled because we'll
3954 * deadlock. The only solution is to rely on the fact
3955 * that we're under rtnl_lock here, and the slaves
3956 * list won't change. This doesn't solve the problem
3957 * of setting the slave's MTU while it is
3958 * transmitting, but the assumption is that the base
3959 * driver can handle that.
3960 *
3961 * TODO: figure out a way to safely iterate the slaves
3962 * list, but without holding a lock around the actual
3963 * call to the base driver.
3964 */
3965
3966 bond_for_each_slave(bond, slave, i) {
3967 pr_debug("s %p s->p %p c_m %p\n",
3968 slave,
3969 slave->prev,
3970 slave->dev->netdev_ops->ndo_change_mtu);
3971
3972 res = dev_set_mtu(slave->dev, new_mtu);
3973
3974 if (res) {
3975 /* If we failed to set the slave's mtu to the new value
3976 * we must abort the operation even in ACTIVE_BACKUP
3977 * mode, because if we allow the backup slaves to have
3978 * different mtu values than the active slave we'll
3979 * need to change their mtu when doing a failover. That
3980 * means changing their mtu from timer context, which
3981 * is probably not a good idea.
3982 */
3983 pr_debug("err %d %s\n", res, slave->dev->name);
3984 goto unwind;
3985 }
3986 }
3987
3988 bond_dev->mtu = new_mtu;
3989
3990 return 0;
3991
3992 unwind:
3993 /* unwind from head to the slave that failed */
3994 stop_at = slave;
3995 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3996 int tmp_res;
3997
3998 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3999 if (tmp_res) {
4000 pr_debug("unwind err %d dev %s\n",
4001 tmp_res, slave->dev->name);
4002 }
4003 }
4004
4005 return res;
4006 }
4007
4008 /*
4009 * Change HW address
4010 *
4011 * Note that many devices must be down to change the HW address, and
4012 * downing the master releases all slaves. We can make bonds full of
4013 * bonding devices to test this, however.
4014 */
4015 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4016 {
4017 struct bonding *bond = netdev_priv(bond_dev);
4018 struct sockaddr *sa = addr, tmp_sa;
4019 struct slave *slave, *stop_at;
4020 int res = 0;
4021 int i;
4022
4023 if (bond->params.mode == BOND_MODE_ALB)
4024 return bond_alb_set_mac_address(bond_dev, addr);
4025
4026
4027 pr_debug("bond=%p, name=%s\n",
4028 bond, bond_dev ? bond_dev->name : "None");
4029
4030 /*
4031 * If fail_over_mac is set to active, do nothing and return
4032 * success. Returning an error causes ifenslave to fail.
4033 */
4034 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
4035 return 0;
4036
4037 if (!is_valid_ether_addr(sa->sa_data))
4038 return -EADDRNOTAVAIL;
4039
4040 /* Can't hold bond->lock with bh disabled here since
4041 * some base drivers panic. On the other hand we can't
4042 * hold bond->lock without bh disabled because we'll
4043 * deadlock. The only solution is to rely on the fact
4044 * that we're under rtnl_lock here, and the slaves
4045 * list won't change. This doesn't solve the problem
4046 * of setting the slave's hw address while it is
4047 * transmitting, but the assumption is that the base
4048 * driver can handle that.
4049 *
4050 * TODO: figure out a way to safely iterate the slaves
4051 * list, but without holding a lock around the actual
4052 * call to the base driver.
4053 */
4054
4055 bond_for_each_slave(bond, slave, i) {
4056 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
4057 pr_debug("slave %p %s\n", slave, slave->dev->name);
4058
4059 if (slave_ops->ndo_set_mac_address == NULL) {
4060 res = -EOPNOTSUPP;
4061 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
4062 goto unwind;
4063 }
4064
4065 res = dev_set_mac_address(slave->dev, addr);
4066 if (res) {
4067 /* TODO: consider downing the slave
4068 * and retry ?
4069 * User should expect communications
4070 * breakage anyway until ARP finish
4071 * updating, so...
4072 */
4073 pr_debug("err %d %s\n", res, slave->dev->name);
4074 goto unwind;
4075 }
4076 }
4077
4078 /* success */
4079 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
4080 return 0;
4081
4082 unwind:
4083 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
4084 tmp_sa.sa_family = bond_dev->type;
4085
4086 /* unwind from head to the slave that failed */
4087 stop_at = slave;
4088 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
4089 int tmp_res;
4090
4091 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
4092 if (tmp_res) {
4093 pr_debug("unwind err %d dev %s\n",
4094 tmp_res, slave->dev->name);
4095 }
4096 }
4097
4098 return res;
4099 }
4100
4101 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
4102 {
4103 struct bonding *bond = netdev_priv(bond_dev);
4104 struct slave *slave, *start_at;
4105 int i, slave_no, res = 1;
4106 struct iphdr *iph = ip_hdr(skb);
4107
4108 read_lock(&bond->lock);
4109
4110 if (!BOND_IS_OK(bond))
4111 goto out;
4112 /*
4113 * Start with the curr_active_slave that joined the bond as the
4114 * default for sending IGMP traffic. For failover purposes one
4115 * needs to maintain some consistency for the interface that will
4116 * send the join/membership reports. The curr_active_slave found
4117 * will send all of this type of traffic.
4118 */
4119 if ((iph->protocol == IPPROTO_IGMP) &&
4120 (skb->protocol == htons(ETH_P_IP))) {
4121
4122 read_lock(&bond->curr_slave_lock);
4123 slave = bond->curr_active_slave;
4124 read_unlock(&bond->curr_slave_lock);
4125
4126 if (!slave)
4127 goto out;
4128 } else {
4129 /*
4130 * Concurrent TX may collide on rr_tx_counter; we accept
4131 * that as being rare enough not to justify using an
4132 * atomic op here.
4133 */
4134 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4135
4136 bond_for_each_slave(bond, slave, i) {
4137 slave_no--;
4138 if (slave_no < 0)
4139 break;
4140 }
4141 }
4142
4143 start_at = slave;
4144 bond_for_each_slave_from(bond, slave, i, start_at) {
4145 if (IS_UP(slave->dev) &&
4146 (slave->link == BOND_LINK_UP) &&
4147 bond_is_active_slave(slave)) {
4148 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4149 break;
4150 }
4151 }
4152
4153 out:
4154 if (res) {
4155 /* no suitable interface, frame not sent */
4156 dev_kfree_skb(skb);
4157 }
4158 read_unlock(&bond->lock);
4159 return NETDEV_TX_OK;
4160 }
4161
4162
4163 /*
4164 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4165 * the bond has a usable interface.
4166 */
4167 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4168 {
4169 struct bonding *bond = netdev_priv(bond_dev);
4170 int res = 1;
4171
4172 read_lock(&bond->lock);
4173 read_lock(&bond->curr_slave_lock);
4174
4175 if (!BOND_IS_OK(bond))
4176 goto out;
4177
4178 if (!bond->curr_active_slave)
4179 goto out;
4180
4181 res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
4182
4183 out:
4184 if (res)
4185 /* no suitable interface, frame not sent */
4186 dev_kfree_skb(skb);
4187
4188 read_unlock(&bond->curr_slave_lock);
4189 read_unlock(&bond->lock);
4190 return NETDEV_TX_OK;
4191 }
4192
4193 /*
4194 * In bond_xmit_xor() , we determine the output device by using a pre-
4195 * determined xmit_hash_policy(), If the selected device is not enabled,
4196 * find the next active slave.
4197 */
4198 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4199 {
4200 struct bonding *bond = netdev_priv(bond_dev);
4201 struct slave *slave, *start_at;
4202 int slave_no;
4203 int i;
4204 int res = 1;
4205
4206 read_lock(&bond->lock);
4207
4208 if (!BOND_IS_OK(bond))
4209 goto out;
4210
4211 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4212
4213 bond_for_each_slave(bond, slave, i) {
4214 slave_no--;
4215 if (slave_no < 0)
4216 break;
4217 }
4218
4219 start_at = slave;
4220
4221 bond_for_each_slave_from(bond, slave, i, start_at) {
4222 if (IS_UP(slave->dev) &&
4223 (slave->link == BOND_LINK_UP) &&
4224 bond_is_active_slave(slave)) {
4225 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4226 break;
4227 }
4228 }
4229
4230 out:
4231 if (res) {
4232 /* no suitable interface, frame not sent */
4233 dev_kfree_skb(skb);
4234 }
4235 read_unlock(&bond->lock);
4236 return NETDEV_TX_OK;
4237 }
4238
4239 /*
4240 * in broadcast mode, we send everything to all usable interfaces.
4241 */
4242 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4243 {
4244 struct bonding *bond = netdev_priv(bond_dev);
4245 struct slave *slave, *start_at;
4246 struct net_device *tx_dev = NULL;
4247 int i;
4248 int res = 1;
4249
4250 read_lock(&bond->lock);
4251
4252 if (!BOND_IS_OK(bond))
4253 goto out;
4254
4255 read_lock(&bond->curr_slave_lock);
4256 start_at = bond->curr_active_slave;
4257 read_unlock(&bond->curr_slave_lock);
4258
4259 if (!start_at)
4260 goto out;
4261
4262 bond_for_each_slave_from(bond, slave, i, start_at) {
4263 if (IS_UP(slave->dev) &&
4264 (slave->link == BOND_LINK_UP) &&
4265 bond_is_active_slave(slave)) {
4266 if (tx_dev) {
4267 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4268 if (!skb2) {
4269 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4270 bond_dev->name);
4271 continue;
4272 }
4273
4274 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4275 if (res) {
4276 dev_kfree_skb(skb2);
4277 continue;
4278 }
4279 }
4280 tx_dev = slave->dev;
4281 }
4282 }
4283
4284 if (tx_dev)
4285 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4286
4287 out:
4288 if (res)
4289 /* no suitable interface, frame not sent */
4290 dev_kfree_skb(skb);
4291
4292 /* frame sent to all suitable interfaces */
4293 read_unlock(&bond->lock);
4294 return NETDEV_TX_OK;
4295 }
4296
4297 /*------------------------- Device initialization ---------------------------*/
4298
4299 static void bond_set_xmit_hash_policy(struct bonding *bond)
4300 {
4301 switch (bond->params.xmit_policy) {
4302 case BOND_XMIT_POLICY_LAYER23:
4303 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4304 break;
4305 case BOND_XMIT_POLICY_LAYER34:
4306 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4307 break;
4308 case BOND_XMIT_POLICY_LAYER2:
4309 default:
4310 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4311 break;
4312 }
4313 }
4314
4315 /*
4316 * Lookup the slave that corresponds to a qid
4317 */
4318 static inline int bond_slave_override(struct bonding *bond,
4319 struct sk_buff *skb)
4320 {
4321 int i, res = 1;
4322 struct slave *slave = NULL;
4323 struct slave *check_slave;
4324
4325 read_lock(&bond->lock);
4326
4327 if (!BOND_IS_OK(bond) || !skb->queue_mapping)
4328 goto out;
4329
4330 /* Find out if any slaves have the same mapping as this skb. */
4331 bond_for_each_slave(bond, check_slave, i) {
4332 if (check_slave->queue_id == skb->queue_mapping) {
4333 slave = check_slave;
4334 break;
4335 }
4336 }
4337
4338 /* If the slave isn't UP, use default transmit policy. */
4339 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4340 (slave->link == BOND_LINK_UP)) {
4341 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4342 }
4343
4344 out:
4345 read_unlock(&bond->lock);
4346 return res;
4347 }
4348
4349 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4350 {
4351 /*
4352 * This helper function exists to help dev_pick_tx get the correct
4353 * destination queue. Using a helper function skips a call to
4354 * skb_tx_hash and will put the skbs in the queue we expect on their
4355 * way down to the bonding driver.
4356 */
4357 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4358
4359 if (unlikely(txq >= dev->real_num_tx_queues)) {
4360 do {
4361 txq -= dev->real_num_tx_queues;
4362 } while (txq >= dev->real_num_tx_queues);
4363 }
4364 return txq;
4365 }
4366
4367 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4368 {
4369 struct bonding *bond = netdev_priv(dev);
4370
4371 /*
4372 * If we risk deadlock from transmitting this in the
4373 * netpoll path, tell netpoll to queue the frame for later tx
4374 */
4375 if (is_netpoll_tx_blocked(dev))
4376 return NETDEV_TX_BUSY;
4377
4378 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4379 if (!bond_slave_override(bond, skb))
4380 return NETDEV_TX_OK;
4381 }
4382
4383 switch (bond->params.mode) {
4384 case BOND_MODE_ROUNDROBIN:
4385 return bond_xmit_roundrobin(skb, dev);
4386 case BOND_MODE_ACTIVEBACKUP:
4387 return bond_xmit_activebackup(skb, dev);
4388 case BOND_MODE_XOR:
4389 return bond_xmit_xor(skb, dev);
4390 case BOND_MODE_BROADCAST:
4391 return bond_xmit_broadcast(skb, dev);
4392 case BOND_MODE_8023AD:
4393 return bond_3ad_xmit_xor(skb, dev);
4394 case BOND_MODE_ALB:
4395 case BOND_MODE_TLB:
4396 return bond_alb_xmit(skb, dev);
4397 default:
4398 /* Should never happen, mode already checked */
4399 pr_err("%s: Error: Unknown bonding mode %d\n",
4400 dev->name, bond->params.mode);
4401 WARN_ON_ONCE(1);
4402 dev_kfree_skb(skb);
4403 return NETDEV_TX_OK;
4404 }
4405 }
4406
4407
4408 /*
4409 * set bond mode specific net device operations
4410 */
4411 void bond_set_mode_ops(struct bonding *bond, int mode)
4412 {
4413 struct net_device *bond_dev = bond->dev;
4414
4415 switch (mode) {
4416 case BOND_MODE_ROUNDROBIN:
4417 break;
4418 case BOND_MODE_ACTIVEBACKUP:
4419 break;
4420 case BOND_MODE_XOR:
4421 bond_set_xmit_hash_policy(bond);
4422 break;
4423 case BOND_MODE_BROADCAST:
4424 break;
4425 case BOND_MODE_8023AD:
4426 bond_set_xmit_hash_policy(bond);
4427 break;
4428 case BOND_MODE_ALB:
4429 /* FALLTHRU */
4430 case BOND_MODE_TLB:
4431 break;
4432 default:
4433 /* Should never happen, mode already checked */
4434 pr_err("%s: Error: Unknown bonding mode %d\n",
4435 bond_dev->name, mode);
4436 break;
4437 }
4438 }
4439
4440 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4441 struct ethtool_drvinfo *drvinfo)
4442 {
4443 strncpy(drvinfo->driver, DRV_NAME, 32);
4444 strncpy(drvinfo->version, DRV_VERSION, 32);
4445 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4446 }
4447
4448 static const struct ethtool_ops bond_ethtool_ops = {
4449 .get_drvinfo = bond_ethtool_get_drvinfo,
4450 .get_link = ethtool_op_get_link,
4451 .get_tx_csum = ethtool_op_get_tx_csum,
4452 .get_sg = ethtool_op_get_sg,
4453 .get_tso = ethtool_op_get_tso,
4454 .get_ufo = ethtool_op_get_ufo,
4455 .get_flags = ethtool_op_get_flags,
4456 };
4457
4458 static const struct net_device_ops bond_netdev_ops = {
4459 .ndo_init = bond_init,
4460 .ndo_uninit = bond_uninit,
4461 .ndo_open = bond_open,
4462 .ndo_stop = bond_close,
4463 .ndo_start_xmit = bond_start_xmit,
4464 .ndo_select_queue = bond_select_queue,
4465 .ndo_get_stats64 = bond_get_stats,
4466 .ndo_do_ioctl = bond_do_ioctl,
4467 .ndo_set_multicast_list = bond_set_multicast_list,
4468 .ndo_change_mtu = bond_change_mtu,
4469 .ndo_set_mac_address = bond_set_mac_address,
4470 .ndo_neigh_setup = bond_neigh_setup,
4471 .ndo_vlan_rx_register = bond_vlan_rx_register,
4472 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4473 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4474 #ifdef CONFIG_NET_POLL_CONTROLLER
4475 .ndo_netpoll_setup = bond_netpoll_setup,
4476 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4477 .ndo_poll_controller = bond_poll_controller,
4478 #endif
4479 .ndo_add_slave = bond_enslave,
4480 .ndo_del_slave = bond_release,
4481 };
4482
4483 static void bond_destructor(struct net_device *bond_dev)
4484 {
4485 struct bonding *bond = netdev_priv(bond_dev);
4486 if (bond->wq)
4487 destroy_workqueue(bond->wq);
4488 free_netdev(bond_dev);
4489 }
4490
4491 static void bond_setup(struct net_device *bond_dev)
4492 {
4493 struct bonding *bond = netdev_priv(bond_dev);
4494
4495 /* initialize rwlocks */
4496 rwlock_init(&bond->lock);
4497 rwlock_init(&bond->curr_slave_lock);
4498
4499 bond->params = bonding_defaults;
4500
4501 /* Initialize pointers */
4502 bond->dev = bond_dev;
4503 INIT_LIST_HEAD(&bond->vlan_list);
4504
4505 /* Initialize the device entry points */
4506 ether_setup(bond_dev);
4507 bond_dev->netdev_ops = &bond_netdev_ops;
4508 bond_dev->ethtool_ops = &bond_ethtool_ops;
4509 bond_set_mode_ops(bond, bond->params.mode);
4510
4511 bond_dev->destructor = bond_destructor;
4512
4513 /* Initialize the device options */
4514 bond_dev->tx_queue_len = 0;
4515 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4516 bond_dev->priv_flags |= IFF_BONDING;
4517 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
4518
4519 /* At first, we block adding VLANs. That's the only way to
4520 * prevent problems that occur when adding VLANs over an
4521 * empty bond. The block will be removed once non-challenged
4522 * slaves are enslaved.
4523 */
4524 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4525
4526 /* don't acquire bond device's netif_tx_lock when
4527 * transmitting */
4528 bond_dev->features |= NETIF_F_LLTX;
4529
4530 /* By default, we declare the bond to be fully
4531 * VLAN hardware accelerated capable. Special
4532 * care is taken in the various xmit functions
4533 * when there are slaves that are not hw accel
4534 * capable
4535 */
4536 bond_dev->features |= (NETIF_F_HW_VLAN_TX |
4537 NETIF_F_HW_VLAN_RX |
4538 NETIF_F_HW_VLAN_FILTER);
4539
4540 /* By default, we enable GRO on bonding devices.
4541 * Actual support requires lowlevel drivers are GRO ready.
4542 */
4543 bond_dev->features |= NETIF_F_GRO;
4544 }
4545
4546 static void bond_work_cancel_all(struct bonding *bond)
4547 {
4548 write_lock_bh(&bond->lock);
4549 bond->kill_timers = 1;
4550 write_unlock_bh(&bond->lock);
4551
4552 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4553 cancel_delayed_work(&bond->mii_work);
4554
4555 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4556 cancel_delayed_work(&bond->arp_work);
4557
4558 if (bond->params.mode == BOND_MODE_ALB &&
4559 delayed_work_pending(&bond->alb_work))
4560 cancel_delayed_work(&bond->alb_work);
4561
4562 if (bond->params.mode == BOND_MODE_8023AD &&
4563 delayed_work_pending(&bond->ad_work))
4564 cancel_delayed_work(&bond->ad_work);
4565
4566 if (delayed_work_pending(&bond->mcast_work))
4567 cancel_delayed_work(&bond->mcast_work);
4568 }
4569
4570 /*
4571 * Destroy a bonding device.
4572 * Must be under rtnl_lock when this function is called.
4573 */
4574 static void bond_uninit(struct net_device *bond_dev)
4575 {
4576 struct bonding *bond = netdev_priv(bond_dev);
4577 struct vlan_entry *vlan, *tmp;
4578
4579 bond_netpoll_cleanup(bond_dev);
4580
4581 /* Release the bonded slaves */
4582 bond_release_all(bond_dev);
4583
4584 list_del(&bond->bond_list);
4585
4586 bond_work_cancel_all(bond);
4587
4588 bond_remove_proc_entry(bond);
4589
4590 bond_debug_unregister(bond);
4591
4592 __hw_addr_flush(&bond->mc_list);
4593
4594 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4595 list_del(&vlan->vlan_list);
4596 kfree(vlan);
4597 }
4598 }
4599
4600 /*------------------------- Module initialization ---------------------------*/
4601
4602 /*
4603 * Convert string input module parms. Accept either the
4604 * number of the mode or its string name. A bit complicated because
4605 * some mode names are substrings of other names, and calls from sysfs
4606 * may have whitespace in the name (trailing newlines, for example).
4607 */
4608 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4609 {
4610 int modeint = -1, i, rv;
4611 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4612
4613 for (p = (char *)buf; *p; p++)
4614 if (!(isdigit(*p) || isspace(*p)))
4615 break;
4616
4617 if (*p)
4618 rv = sscanf(buf, "%20s", modestr);
4619 else
4620 rv = sscanf(buf, "%d", &modeint);
4621
4622 if (!rv)
4623 return -1;
4624
4625 for (i = 0; tbl[i].modename; i++) {
4626 if (modeint == tbl[i].mode)
4627 return tbl[i].mode;
4628 if (strcmp(modestr, tbl[i].modename) == 0)
4629 return tbl[i].mode;
4630 }
4631
4632 return -1;
4633 }
4634
4635 static int bond_check_params(struct bond_params *params)
4636 {
4637 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4638
4639 /*
4640 * Convert string parameters.
4641 */
4642 if (mode) {
4643 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4644 if (bond_mode == -1) {
4645 pr_err("Error: Invalid bonding mode \"%s\"\n",
4646 mode == NULL ? "NULL" : mode);
4647 return -EINVAL;
4648 }
4649 }
4650
4651 if (xmit_hash_policy) {
4652 if ((bond_mode != BOND_MODE_XOR) &&
4653 (bond_mode != BOND_MODE_8023AD)) {
4654 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4655 bond_mode_name(bond_mode));
4656 } else {
4657 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4658 xmit_hashtype_tbl);
4659 if (xmit_hashtype == -1) {
4660 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4661 xmit_hash_policy == NULL ? "NULL" :
4662 xmit_hash_policy);
4663 return -EINVAL;
4664 }
4665 }
4666 }
4667
4668 if (lacp_rate) {
4669 if (bond_mode != BOND_MODE_8023AD) {
4670 pr_info("lacp_rate param is irrelevant in mode %s\n",
4671 bond_mode_name(bond_mode));
4672 } else {
4673 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4674 if (lacp_fast == -1) {
4675 pr_err("Error: Invalid lacp rate \"%s\"\n",
4676 lacp_rate == NULL ? "NULL" : lacp_rate);
4677 return -EINVAL;
4678 }
4679 }
4680 }
4681
4682 if (ad_select) {
4683 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4684 if (params->ad_select == -1) {
4685 pr_err("Error: Invalid ad_select \"%s\"\n",
4686 ad_select == NULL ? "NULL" : ad_select);
4687 return -EINVAL;
4688 }
4689
4690 if (bond_mode != BOND_MODE_8023AD) {
4691 pr_warning("ad_select param only affects 802.3ad mode\n");
4692 }
4693 } else {
4694 params->ad_select = BOND_AD_STABLE;
4695 }
4696
4697 if (max_bonds < 0) {
4698 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4699 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4700 max_bonds = BOND_DEFAULT_MAX_BONDS;
4701 }
4702
4703 if (miimon < 0) {
4704 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4705 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4706 miimon = BOND_LINK_MON_INTERV;
4707 }
4708
4709 if (updelay < 0) {
4710 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4711 updelay, INT_MAX);
4712 updelay = 0;
4713 }
4714
4715 if (downdelay < 0) {
4716 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4717 downdelay, INT_MAX);
4718 downdelay = 0;
4719 }
4720
4721 if ((use_carrier != 0) && (use_carrier != 1)) {
4722 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4723 use_carrier);
4724 use_carrier = 1;
4725 }
4726
4727 if (num_grat_arp < 0 || num_grat_arp > 255) {
4728 pr_warning("Warning: num_grat_arp (%d) not in range 0-255 so it was reset to 1\n",
4729 num_grat_arp);
4730 num_grat_arp = 1;
4731 }
4732
4733 if (num_unsol_na < 0 || num_unsol_na > 255) {
4734 pr_warning("Warning: num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4735 num_unsol_na);
4736 num_unsol_na = 1;
4737 }
4738
4739 /* reset values for 802.3ad */
4740 if (bond_mode == BOND_MODE_8023AD) {
4741 if (!miimon) {
4742 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4743 pr_warning("Forcing miimon to 100msec\n");
4744 miimon = 100;
4745 }
4746 }
4747
4748 if (tx_queues < 1 || tx_queues > 255) {
4749 pr_warning("Warning: tx_queues (%d) should be between "
4750 "1 and 255, resetting to %d\n",
4751 tx_queues, BOND_DEFAULT_TX_QUEUES);
4752 tx_queues = BOND_DEFAULT_TX_QUEUES;
4753 }
4754
4755 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4756 pr_warning("Warning: all_slaves_active module parameter (%d), "
4757 "not of valid value (0/1), so it was set to "
4758 "0\n", all_slaves_active);
4759 all_slaves_active = 0;
4760 }
4761
4762 if (resend_igmp < 0 || resend_igmp > 255) {
4763 pr_warning("Warning: resend_igmp (%d) should be between "
4764 "0 and 255, resetting to %d\n",
4765 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4766 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4767 }
4768
4769 /* reset values for TLB/ALB */
4770 if ((bond_mode == BOND_MODE_TLB) ||
4771 (bond_mode == BOND_MODE_ALB)) {
4772 if (!miimon) {
4773 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4774 pr_warning("Forcing miimon to 100msec\n");
4775 miimon = 100;
4776 }
4777 }
4778
4779 if (bond_mode == BOND_MODE_ALB) {
4780 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4781 updelay);
4782 }
4783
4784 if (!miimon) {
4785 if (updelay || downdelay) {
4786 /* just warn the user the up/down delay will have
4787 * no effect since miimon is zero...
4788 */
4789 pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4790 updelay, downdelay);
4791 }
4792 } else {
4793 /* don't allow arp monitoring */
4794 if (arp_interval) {
4795 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4796 miimon, arp_interval);
4797 arp_interval = 0;
4798 }
4799
4800 if ((updelay % miimon) != 0) {
4801 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4802 updelay, miimon,
4803 (updelay / miimon) * miimon);
4804 }
4805
4806 updelay /= miimon;
4807
4808 if ((downdelay % miimon) != 0) {
4809 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4810 downdelay, miimon,
4811 (downdelay / miimon) * miimon);
4812 }
4813
4814 downdelay /= miimon;
4815 }
4816
4817 if (arp_interval < 0) {
4818 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4819 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4820 arp_interval = BOND_LINK_ARP_INTERV;
4821 }
4822
4823 for (arp_ip_count = 0;
4824 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4825 arp_ip_count++) {
4826 /* not complete check, but should be good enough to
4827 catch mistakes */
4828 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4829 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4830 arp_ip_target[arp_ip_count]);
4831 arp_interval = 0;
4832 } else {
4833 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4834 arp_target[arp_ip_count] = ip;
4835 }
4836 }
4837
4838 if (arp_interval && !arp_ip_count) {
4839 /* don't allow arping if no arp_ip_target given... */
4840 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4841 arp_interval);
4842 arp_interval = 0;
4843 }
4844
4845 if (arp_validate) {
4846 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4847 pr_err("arp_validate only supported in active-backup mode\n");
4848 return -EINVAL;
4849 }
4850 if (!arp_interval) {
4851 pr_err("arp_validate requires arp_interval\n");
4852 return -EINVAL;
4853 }
4854
4855 arp_validate_value = bond_parse_parm(arp_validate,
4856 arp_validate_tbl);
4857 if (arp_validate_value == -1) {
4858 pr_err("Error: invalid arp_validate \"%s\"\n",
4859 arp_validate == NULL ? "NULL" : arp_validate);
4860 return -EINVAL;
4861 }
4862 } else
4863 arp_validate_value = 0;
4864
4865 if (miimon) {
4866 pr_info("MII link monitoring set to %d ms\n", miimon);
4867 } else if (arp_interval) {
4868 int i;
4869
4870 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4871 arp_interval,
4872 arp_validate_tbl[arp_validate_value].modename,
4873 arp_ip_count);
4874
4875 for (i = 0; i < arp_ip_count; i++)
4876 pr_info(" %s", arp_ip_target[i]);
4877
4878 pr_info("\n");
4879
4880 } else if (max_bonds) {
4881 /* miimon and arp_interval not set, we need one so things
4882 * work as expected, see bonding.txt for details
4883 */
4884 pr_warning("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details.\n");
4885 }
4886
4887 if (primary && !USES_PRIMARY(bond_mode)) {
4888 /* currently, using a primary only makes sense
4889 * in active backup, TLB or ALB modes
4890 */
4891 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4892 primary, bond_mode_name(bond_mode));
4893 primary = NULL;
4894 }
4895
4896 if (primary && primary_reselect) {
4897 primary_reselect_value = bond_parse_parm(primary_reselect,
4898 pri_reselect_tbl);
4899 if (primary_reselect_value == -1) {
4900 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4901 primary_reselect ==
4902 NULL ? "NULL" : primary_reselect);
4903 return -EINVAL;
4904 }
4905 } else {
4906 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4907 }
4908
4909 if (fail_over_mac) {
4910 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4911 fail_over_mac_tbl);
4912 if (fail_over_mac_value == -1) {
4913 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4914 arp_validate == NULL ? "NULL" : arp_validate);
4915 return -EINVAL;
4916 }
4917
4918 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4919 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4920 } else {
4921 fail_over_mac_value = BOND_FOM_NONE;
4922 }
4923
4924 /* fill params struct with the proper values */
4925 params->mode = bond_mode;
4926 params->xmit_policy = xmit_hashtype;
4927 params->miimon = miimon;
4928 params->num_grat_arp = num_grat_arp;
4929 params->num_unsol_na = num_unsol_na;
4930 params->arp_interval = arp_interval;
4931 params->arp_validate = arp_validate_value;
4932 params->updelay = updelay;
4933 params->downdelay = downdelay;
4934 params->use_carrier = use_carrier;
4935 params->lacp_fast = lacp_fast;
4936 params->primary[0] = 0;
4937 params->primary_reselect = primary_reselect_value;
4938 params->fail_over_mac = fail_over_mac_value;
4939 params->tx_queues = tx_queues;
4940 params->all_slaves_active = all_slaves_active;
4941 params->resend_igmp = resend_igmp;
4942
4943 if (primary) {
4944 strncpy(params->primary, primary, IFNAMSIZ);
4945 params->primary[IFNAMSIZ - 1] = 0;
4946 }
4947
4948 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4949
4950 return 0;
4951 }
4952
4953 static struct lock_class_key bonding_netdev_xmit_lock_key;
4954 static struct lock_class_key bonding_netdev_addr_lock_key;
4955
4956 static void bond_set_lockdep_class_one(struct net_device *dev,
4957 struct netdev_queue *txq,
4958 void *_unused)
4959 {
4960 lockdep_set_class(&txq->_xmit_lock,
4961 &bonding_netdev_xmit_lock_key);
4962 }
4963
4964 static void bond_set_lockdep_class(struct net_device *dev)
4965 {
4966 lockdep_set_class(&dev->addr_list_lock,
4967 &bonding_netdev_addr_lock_key);
4968 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4969 }
4970
4971 /*
4972 * Called from registration process
4973 */
4974 static int bond_init(struct net_device *bond_dev)
4975 {
4976 struct bonding *bond = netdev_priv(bond_dev);
4977 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4978
4979 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4980
4981 bond->wq = create_singlethread_workqueue(bond_dev->name);
4982 if (!bond->wq)
4983 return -ENOMEM;
4984
4985 bond_set_lockdep_class(bond_dev);
4986
4987 bond_create_proc_entry(bond);
4988 list_add_tail(&bond->bond_list, &bn->dev_list);
4989
4990 bond_prepare_sysfs_group(bond);
4991
4992 bond_debug_register(bond);
4993
4994 __hw_addr_init(&bond->mc_list);
4995 return 0;
4996 }
4997
4998 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4999 {
5000 if (tb[IFLA_ADDRESS]) {
5001 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
5002 return -EINVAL;
5003 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
5004 return -EADDRNOTAVAIL;
5005 }
5006 return 0;
5007 }
5008
5009 static struct rtnl_link_ops bond_link_ops __read_mostly = {
5010 .kind = "bond",
5011 .priv_size = sizeof(struct bonding),
5012 .setup = bond_setup,
5013 .validate = bond_validate,
5014 };
5015
5016 /* Create a new bond based on the specified name and bonding parameters.
5017 * If name is NULL, obtain a suitable "bond%d" name for us.
5018 * Caller must NOT hold rtnl_lock; we need to release it here before we
5019 * set up our sysfs entries.
5020 */
5021 int bond_create(struct net *net, const char *name)
5022 {
5023 struct net_device *bond_dev;
5024 int res;
5025
5026 rtnl_lock();
5027
5028 bond_dev = alloc_netdev_mq(sizeof(struct bonding), name ? name : "",
5029 bond_setup, tx_queues);
5030 if (!bond_dev) {
5031 pr_err("%s: eek! can't alloc netdev!\n", name);
5032 rtnl_unlock();
5033 return -ENOMEM;
5034 }
5035
5036 dev_net_set(bond_dev, net);
5037 bond_dev->rtnl_link_ops = &bond_link_ops;
5038
5039 if (!name) {
5040 res = dev_alloc_name(bond_dev, "bond%d");
5041 if (res < 0)
5042 goto out;
5043 } else {
5044 /*
5045 * If we're given a name to register
5046 * we need to ensure that its not already
5047 * registered
5048 */
5049 res = -EEXIST;
5050 if (__dev_get_by_name(net, name) != NULL)
5051 goto out;
5052 }
5053
5054 res = register_netdevice(bond_dev);
5055
5056 netif_carrier_off(bond_dev);
5057
5058 out:
5059 rtnl_unlock();
5060 if (res < 0)
5061 bond_destructor(bond_dev);
5062 return res;
5063 }
5064
5065 static int __net_init bond_net_init(struct net *net)
5066 {
5067 struct bond_net *bn = net_generic(net, bond_net_id);
5068
5069 bn->net = net;
5070 INIT_LIST_HEAD(&bn->dev_list);
5071
5072 bond_create_proc_dir(bn);
5073
5074 return 0;
5075 }
5076
5077 static void __net_exit bond_net_exit(struct net *net)
5078 {
5079 struct bond_net *bn = net_generic(net, bond_net_id);
5080
5081 bond_destroy_proc_dir(bn);
5082 }
5083
5084 static struct pernet_operations bond_net_ops = {
5085 .init = bond_net_init,
5086 .exit = bond_net_exit,
5087 .id = &bond_net_id,
5088 .size = sizeof(struct bond_net),
5089 };
5090
5091 static int __init bonding_init(void)
5092 {
5093 int i;
5094 int res;
5095
5096 pr_info("%s", bond_version);
5097
5098 res = bond_check_params(&bonding_defaults);
5099 if (res)
5100 goto out;
5101
5102 res = register_pernet_subsys(&bond_net_ops);
5103 if (res)
5104 goto out;
5105
5106 res = rtnl_link_register(&bond_link_ops);
5107 if (res)
5108 goto err_link;
5109
5110 bond_create_debugfs();
5111
5112 for (i = 0; i < max_bonds; i++) {
5113 res = bond_create(&init_net, NULL);
5114 if (res)
5115 goto err;
5116 }
5117
5118 res = bond_create_sysfs();
5119 if (res)
5120 goto err;
5121
5122 register_netdevice_notifier(&bond_netdev_notifier);
5123 register_inetaddr_notifier(&bond_inetaddr_notifier);
5124 bond_register_ipv6_notifier();
5125 out:
5126 return res;
5127 err:
5128 rtnl_link_unregister(&bond_link_ops);
5129 err_link:
5130 unregister_pernet_subsys(&bond_net_ops);
5131 goto out;
5132
5133 }
5134
5135 static void __exit bonding_exit(void)
5136 {
5137 unregister_netdevice_notifier(&bond_netdev_notifier);
5138 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
5139 bond_unregister_ipv6_notifier();
5140
5141 bond_destroy_sysfs();
5142 bond_destroy_debugfs();
5143
5144 rtnl_link_unregister(&bond_link_ops);
5145 unregister_pernet_subsys(&bond_net_ops);
5146
5147 #ifdef CONFIG_NET_POLL_CONTROLLER
5148 /*
5149 * Make sure we don't have an imbalance on our netpoll blocking
5150 */
5151 WARN_ON(atomic_read(&netpoll_block_tx));
5152 #endif
5153 }
5154
5155 module_init(bonding_init);
5156 module_exit(bonding_exit);
5157 MODULE_LICENSE("GPL");
5158 MODULE_VERSION(DRV_VERSION);
5159 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5160 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5161 MODULE_ALIAS_RTNL_LINK("bond");
Linux kernel - Deliverables
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