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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
90static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92static int num_peer_notif = 1;
93static int miimon = BOND_LINK_MON_INTERV;
94static int updelay;
95static int downdelay;
96static int use_carrier = 1;
97static char *mode;
98static char *primary;
99static char *primary_reselect;
100static char *lacp_rate;
101static int min_links;
102static char *ad_select;
103static char *xmit_hash_policy;
104static int arp_interval = BOND_LINK_ARP_INTERV;
105static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106static char *arp_validate;
107static char *fail_over_mac;
108static int all_slaves_active = 0;
109static struct bond_params bonding_defaults;
110static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
111
112module_param(max_bonds, int, 0);
113MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114module_param(tx_queues, int, 0);
115MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116module_param_named(num_grat_arp, num_peer_notif, int, 0644);
117MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
118 "failover event (alias of num_unsol_na)");
119module_param_named(num_unsol_na, num_peer_notif, int, 0644);
120MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
121 "failover event (alias of num_grat_arp)");
122module_param(miimon, int, 0);
123MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
124module_param(updelay, int, 0);
125MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
126module_param(downdelay, int, 0);
127MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
128 "in milliseconds");
129module_param(use_carrier, int, 0);
130MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
131 "0 for off, 1 for on (default)");
132module_param(mode, charp, 0);
133MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
134 "1 for active-backup, 2 for balance-xor, "
135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
136 "6 for balance-alb");
137module_param(primary, charp, 0);
138MODULE_PARM_DESC(primary, "Primary network device to use");
139module_param(primary_reselect, charp, 0);
140MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
141 "once it comes up; "
142 "0 for always (default), "
143 "1 for only if speed of primary is "
144 "better, "
145 "2 for only on active slave "
146 "failure");
147module_param(lacp_rate, charp, 0);
148MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
149 "0 for slow, 1 for fast");
150module_param(ad_select, charp, 0);
151MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
152 "0 for stable (default), 1 for bandwidth, "
153 "2 for count");
154module_param(min_links, int, 0);
155MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
156
157module_param(xmit_hash_policy, charp, 0);
158MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
159 "0 for layer 2 (default), 1 for layer 3+4, "
160 "2 for layer 2+3");
161module_param(arp_interval, int, 0);
162MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
163module_param_array(arp_ip_target, charp, NULL, 0);
164MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
165module_param(arp_validate, charp, 0);
166MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
167 "0 for none (default), 1 for active, "
168 "2 for backup, 3 for all");
169module_param(fail_over_mac, charp, 0);
170MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
171 "the same MAC; 0 for none (default), "
172 "1 for active, 2 for follow");
173module_param(all_slaves_active, int, 0);
174MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
175 "by setting active flag for all slaves; "
176 "0 for never (default), 1 for always.");
177module_param(resend_igmp, int, 0);
178MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
179 "link failure");
180
181/*----------------------------- Global variables ----------------------------*/
182
183#ifdef CONFIG_NET_POLL_CONTROLLER
184atomic_t netpoll_block_tx = ATOMIC_INIT(0);
185#endif
186
187int bond_net_id __read_mostly;
188
189static __be32 arp_target[BOND_MAX_ARP_TARGETS];
190static int arp_ip_count;
191static int bond_mode = BOND_MODE_ROUNDROBIN;
192static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
193static int lacp_fast;
194
195const struct bond_parm_tbl bond_lacp_tbl[] = {
196{ "slow", AD_LACP_SLOW},
197{ "fast", AD_LACP_FAST},
198{ NULL, -1},
199};
200
201const struct bond_parm_tbl bond_mode_tbl[] = {
202{ "balance-rr", BOND_MODE_ROUNDROBIN},
203{ "active-backup", BOND_MODE_ACTIVEBACKUP},
204{ "balance-xor", BOND_MODE_XOR},
205{ "broadcast", BOND_MODE_BROADCAST},
206{ "802.3ad", BOND_MODE_8023AD},
207{ "balance-tlb", BOND_MODE_TLB},
208{ "balance-alb", BOND_MODE_ALB},
209{ NULL, -1},
210};
211
212const struct bond_parm_tbl xmit_hashtype_tbl[] = {
213{ "layer2", BOND_XMIT_POLICY_LAYER2},
214{ "layer3+4", BOND_XMIT_POLICY_LAYER34},
215{ "layer2+3", BOND_XMIT_POLICY_LAYER23},
216{ NULL, -1},
217};
218
219const struct bond_parm_tbl arp_validate_tbl[] = {
220{ "none", BOND_ARP_VALIDATE_NONE},
221{ "active", BOND_ARP_VALIDATE_ACTIVE},
222{ "backup", BOND_ARP_VALIDATE_BACKUP},
223{ "all", BOND_ARP_VALIDATE_ALL},
224{ NULL, -1},
225};
226
227const struct bond_parm_tbl fail_over_mac_tbl[] = {
228{ "none", BOND_FOM_NONE},
229{ "active", BOND_FOM_ACTIVE},
230{ "follow", BOND_FOM_FOLLOW},
231{ NULL, -1},
232};
233
234const struct bond_parm_tbl pri_reselect_tbl[] = {
235{ "always", BOND_PRI_RESELECT_ALWAYS},
236{ "better", BOND_PRI_RESELECT_BETTER},
237{ "failure", BOND_PRI_RESELECT_FAILURE},
238{ NULL, -1},
239};
240
241struct bond_parm_tbl ad_select_tbl[] = {
242{ "stable", BOND_AD_STABLE},
243{ "bandwidth", BOND_AD_BANDWIDTH},
244{ "count", BOND_AD_COUNT},
245{ NULL, -1},
246};
247
248/*-------------------------- Forward declarations ---------------------------*/
249
250static int bond_init(struct net_device *bond_dev);
251static void bond_uninit(struct net_device *bond_dev);
252
253/*---------------------------- General routines -----------------------------*/
254
255const char *bond_mode_name(int mode)
256{
257 static const char *names[] = {
258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
260 [BOND_MODE_XOR] = "load balancing (xor)",
261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
263 [BOND_MODE_TLB] = "transmit load balancing",
264 [BOND_MODE_ALB] = "adaptive load balancing",
265 };
266
267 if (mode < 0 || mode > BOND_MODE_ALB)
268 return "unknown";
269
270 return names[mode];
271}
272
273/*---------------------------------- VLAN -----------------------------------*/
274
275/**
276 * bond_add_vlan - add a new vlan id on bond
277 * @bond: bond that got the notification
278 * @vlan_id: the vlan id to add
279 *
280 * Returns -ENOMEM if allocation failed.
281 */
282static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
283{
284 struct vlan_entry *vlan;
285
286 pr_debug("bond: %s, vlan id %d\n",
287 (bond ? bond->dev->name : "None"), vlan_id);
288
289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
290 if (!vlan)
291 return -ENOMEM;
292
293 INIT_LIST_HEAD(&vlan->vlan_list);
294 vlan->vlan_id = vlan_id;
295
296 write_lock_bh(&bond->lock);
297
298 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
299
300 write_unlock_bh(&bond->lock);
301
302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
303
304 return 0;
305}
306
307/**
308 * bond_del_vlan - delete a vlan id from bond
309 * @bond: bond that got the notification
310 * @vlan_id: the vlan id to delete
311 *
312 * returns -ENODEV if @vlan_id was not found in @bond.
313 */
314static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
315{
316 struct vlan_entry *vlan;
317 int res = -ENODEV;
318
319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
320
321 block_netpoll_tx();
322 write_lock_bh(&bond->lock);
323
324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
325 if (vlan->vlan_id == vlan_id) {
326 list_del(&vlan->vlan_list);
327
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vlan_id);
330
331 pr_debug("removed VLAN ID %d from bond %s\n",
332 vlan_id, bond->dev->name);
333
334 kfree(vlan);
335
336 res = 0;
337 goto out;
338 }
339 }
340
341 pr_debug("couldn't find VLAN ID %d in bond %s\n",
342 vlan_id, bond->dev->name);
343
344out:
345 write_unlock_bh(&bond->lock);
346 unblock_netpoll_tx();
347 return res;
348}
349
350/**
351 * bond_next_vlan - safely skip to the next item in the vlans list.
352 * @bond: the bond we're working on
353 * @curr: item we're advancing from
354 *
355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
356 * or @curr->next otherwise (even if it is @curr itself again).
357 *
358 * Caller must hold bond->lock
359 */
360struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
361{
362 struct vlan_entry *next, *last;
363
364 if (list_empty(&bond->vlan_list))
365 return NULL;
366
367 if (!curr) {
368 next = list_entry(bond->vlan_list.next,
369 struct vlan_entry, vlan_list);
370 } else {
371 last = list_entry(bond->vlan_list.prev,
372 struct vlan_entry, vlan_list);
373 if (last == curr) {
374 next = list_entry(bond->vlan_list.next,
375 struct vlan_entry, vlan_list);
376 } else {
377 next = list_entry(curr->vlan_list.next,
378 struct vlan_entry, vlan_list);
379 }
380 }
381
382 return next;
383}
384
385#define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))
386
387/**
388 * bond_dev_queue_xmit - Prepare skb for xmit.
389 *
390 * @bond: bond device that got this skb for tx.
391 * @skb: hw accel VLAN tagged skb to transmit
392 * @slave_dev: slave that is supposed to xmit this skbuff
393 */
394int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
395 struct net_device *slave_dev)
396{
397 skb->dev = slave_dev;
398 skb->priority = 1;
399
400 skb->queue_mapping = bond_queue_mapping(skb);
401
402 if (unlikely(netpoll_tx_running(slave_dev)))
403 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
404 else
405 dev_queue_xmit(skb);
406
407 return 0;
408}
409
410/*
411 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
412 * We don't protect the slave list iteration with a lock because:
413 * a. This operation is performed in IOCTL context,
414 * b. The operation is protected by the RTNL semaphore in the 8021q code,
415 * c. Holding a lock with BH disabled while directly calling a base driver
416 * entry point is generally a BAD idea.
417 *
418 * The design of synchronization/protection for this operation in the 8021q
419 * module is good for one or more VLAN devices over a single physical device
420 * and cannot be extended for a teaming solution like bonding, so there is a
421 * potential race condition here where a net device from the vlan group might
422 * be referenced (either by a base driver or the 8021q code) while it is being
423 * removed from the system. However, it turns out we're not making matters
424 * worse, and if it works for regular VLAN usage it will work here too.
425*/
426
427/**
428 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
429 * @bond_dev: bonding net device that got called
430 * @vid: vlan id being added
431 */
432static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
433{
434 struct bonding *bond = netdev_priv(bond_dev);
435 struct slave *slave;
436 int i, res;
437
438 bond_for_each_slave(bond, slave, i) {
439 struct net_device *slave_dev = slave->dev;
440 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441
442 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
443 slave_ops->ndo_vlan_rx_add_vid) {
444 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
445 }
446 }
447
448 res = bond_add_vlan(bond, vid);
449 if (res) {
450 pr_err("%s: Error: Failed to add vlan id %d\n",
451 bond_dev->name, vid);
452 }
453}
454
455/**
456 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
457 * @bond_dev: bonding net device that got called
458 * @vid: vlan id being removed
459 */
460static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
461{
462 struct bonding *bond = netdev_priv(bond_dev);
463 struct slave *slave;
464 int i, res;
465
466 bond_for_each_slave(bond, slave, i) {
467 struct net_device *slave_dev = slave->dev;
468 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
469
470 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
471 slave_ops->ndo_vlan_rx_kill_vid) {
472 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
473 }
474 }
475
476 res = bond_del_vlan(bond, vid);
477 if (res) {
478 pr_err("%s: Error: Failed to remove vlan id %d\n",
479 bond_dev->name, vid);
480 }
481}
482
483static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
484{
485 struct vlan_entry *vlan;
486 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
487
488 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
489 !(slave_ops->ndo_vlan_rx_add_vid))
490 return;
491
492 list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
493 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
494}
495
496static void bond_del_vlans_from_slave(struct bonding *bond,
497 struct net_device *slave_dev)
498{
499 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
500 struct vlan_entry *vlan;
501
502 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
503 !(slave_ops->ndo_vlan_rx_kill_vid))
504 return;
505
506 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
507 if (!vlan->vlan_id)
508 continue;
509 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
510 }
511}
512
513/*------------------------------- Link status -------------------------------*/
514
515/*
516 * Set the carrier state for the master according to the state of its
517 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
518 * do special 802.3ad magic.
519 *
520 * Returns zero if carrier state does not change, nonzero if it does.
521 */
522static int bond_set_carrier(struct bonding *bond)
523{
524 struct slave *slave;
525 int i;
526
527 if (bond->slave_cnt == 0)
528 goto down;
529
530 if (bond->params.mode == BOND_MODE_8023AD)
531 return bond_3ad_set_carrier(bond);
532
533 bond_for_each_slave(bond, slave, i) {
534 if (slave->link == BOND_LINK_UP) {
535 if (!netif_carrier_ok(bond->dev)) {
536 netif_carrier_on(bond->dev);
537 return 1;
538 }
539 return 0;
540 }
541 }
542
543down:
544 if (netif_carrier_ok(bond->dev)) {
545 netif_carrier_off(bond->dev);
546 return 1;
547 }
548 return 0;
549}
550
551/*
552 * Get link speed and duplex from the slave's base driver
553 * using ethtool. If for some reason the call fails or the
554 * values are invalid, fake speed and duplex to 100/Full
555 * and return error.
556 */
557static int bond_update_speed_duplex(struct slave *slave)
558{
559 struct net_device *slave_dev = slave->dev;
560 struct ethtool_cmd etool = { .cmd = ETHTOOL_GSET };
561 u32 slave_speed;
562 int res;
563
564 /* Fake speed and duplex */
565 slave->speed = SPEED_100;
566 slave->duplex = DUPLEX_FULL;
567
568 if (!slave_dev->ethtool_ops || !slave_dev->ethtool_ops->get_settings)
569 return -1;
570
571 res = slave_dev->ethtool_ops->get_settings(slave_dev, &etool);
572 if (res < 0)
573 return -1;
574
575 slave_speed = ethtool_cmd_speed(&etool);
576 if (slave_speed == 0 || slave_speed == ((__u32) -1))
577 return -1;
578
579 switch (etool.duplex) {
580 case DUPLEX_FULL:
581 case DUPLEX_HALF:
582 break;
583 default:
584 return -1;
585 }
586
587 slave->speed = slave_speed;
588 slave->duplex = etool.duplex;
589
590 return 0;
591}
592
593/*
594 * if <dev> supports MII link status reporting, check its link status.
595 *
596 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
597 * depending upon the setting of the use_carrier parameter.
598 *
599 * Return either BMSR_LSTATUS, meaning that the link is up (or we
600 * can't tell and just pretend it is), or 0, meaning that the link is
601 * down.
602 *
603 * If reporting is non-zero, instead of faking link up, return -1 if
604 * both ETHTOOL and MII ioctls fail (meaning the device does not
605 * support them). If use_carrier is set, return whatever it says.
606 * It'd be nice if there was a good way to tell if a driver supports
607 * netif_carrier, but there really isn't.
608 */
609static int bond_check_dev_link(struct bonding *bond,
610 struct net_device *slave_dev, int reporting)
611{
612 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
613 int (*ioctl)(struct net_device *, struct ifreq *, int);
614 struct ifreq ifr;
615 struct mii_ioctl_data *mii;
616
617 if (!reporting && !netif_running(slave_dev))
618 return 0;
619
620 if (bond->params.use_carrier)
621 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
622
623 /* Try to get link status using Ethtool first. */
624 if (slave_dev->ethtool_ops) {
625 if (slave_dev->ethtool_ops->get_link) {
626 u32 link;
627
628 link = slave_dev->ethtool_ops->get_link(slave_dev);
629
630 return link ? BMSR_LSTATUS : 0;
631 }
632 }
633
634 /* Ethtool can't be used, fallback to MII ioctls. */
635 ioctl = slave_ops->ndo_do_ioctl;
636 if (ioctl) {
637 /* TODO: set pointer to correct ioctl on a per team member */
638 /* bases to make this more efficient. that is, once */
639 /* we determine the correct ioctl, we will always */
640 /* call it and not the others for that team */
641 /* member. */
642
643 /*
644 * We cannot assume that SIOCGMIIPHY will also read a
645 * register; not all network drivers (e.g., e100)
646 * support that.
647 */
648
649 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
650 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
651 mii = if_mii(&ifr);
652 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
653 mii->reg_num = MII_BMSR;
654 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
655 return mii->val_out & BMSR_LSTATUS;
656 }
657 }
658
659 /*
660 * If reporting, report that either there's no dev->do_ioctl,
661 * or both SIOCGMIIREG and get_link failed (meaning that we
662 * cannot report link status). If not reporting, pretend
663 * we're ok.
664 */
665 return reporting ? -1 : BMSR_LSTATUS;
666}
667
668/*----------------------------- Multicast list ------------------------------*/
669
670/*
671 * Push the promiscuity flag down to appropriate slaves
672 */
673static int bond_set_promiscuity(struct bonding *bond, int inc)
674{
675 int err = 0;
676 if (USES_PRIMARY(bond->params.mode)) {
677 /* write lock already acquired */
678 if (bond->curr_active_slave) {
679 err = dev_set_promiscuity(bond->curr_active_slave->dev,
680 inc);
681 }
682 } else {
683 struct slave *slave;
684 int i;
685 bond_for_each_slave(bond, slave, i) {
686 err = dev_set_promiscuity(slave->dev, inc);
687 if (err)
688 return err;
689 }
690 }
691 return err;
692}
693
694/*
695 * Push the allmulti flag down to all slaves
696 */
697static int bond_set_allmulti(struct bonding *bond, int inc)
698{
699 int err = 0;
700 if (USES_PRIMARY(bond->params.mode)) {
701 /* write lock already acquired */
702 if (bond->curr_active_slave) {
703 err = dev_set_allmulti(bond->curr_active_slave->dev,
704 inc);
705 }
706 } else {
707 struct slave *slave;
708 int i;
709 bond_for_each_slave(bond, slave, i) {
710 err = dev_set_allmulti(slave->dev, inc);
711 if (err)
712 return err;
713 }
714 }
715 return err;
716}
717
718/*
719 * Add a Multicast address to slaves
720 * according to mode
721 */
722static void bond_mc_add(struct bonding *bond, void *addr)
723{
724 if (USES_PRIMARY(bond->params.mode)) {
725 /* write lock already acquired */
726 if (bond->curr_active_slave)
727 dev_mc_add(bond->curr_active_slave->dev, addr);
728 } else {
729 struct slave *slave;
730 int i;
731
732 bond_for_each_slave(bond, slave, i)
733 dev_mc_add(slave->dev, addr);
734 }
735}
736
737/*
738 * Remove a multicast address from slave
739 * according to mode
740 */
741static void bond_mc_del(struct bonding *bond, void *addr)
742{
743 if (USES_PRIMARY(bond->params.mode)) {
744 /* write lock already acquired */
745 if (bond->curr_active_slave)
746 dev_mc_del(bond->curr_active_slave->dev, addr);
747 } else {
748 struct slave *slave;
749 int i;
750 bond_for_each_slave(bond, slave, i) {
751 dev_mc_del(slave->dev, addr);
752 }
753 }
754}
755
756
757static void __bond_resend_igmp_join_requests(struct net_device *dev)
758{
759 struct in_device *in_dev;
760
761 rcu_read_lock();
762 in_dev = __in_dev_get_rcu(dev);
763 if (in_dev)
764 ip_mc_rejoin_groups(in_dev);
765 rcu_read_unlock();
766}
767
768/*
769 * Retrieve the list of registered multicast addresses for the bonding
770 * device and retransmit an IGMP JOIN request to the current active
771 * slave.
772 */
773static void bond_resend_igmp_join_requests(struct bonding *bond)
774{
775 struct net_device *vlan_dev;
776 struct vlan_entry *vlan;
777
778 read_lock(&bond->lock);
779
780 if (bond->kill_timers)
781 goto out;
782
783 /* rejoin all groups on bond device */
784 __bond_resend_igmp_join_requests(bond->dev);
785
786 /* rejoin all groups on vlan devices */
787 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
788 rcu_read_lock();
789 vlan_dev = __vlan_find_dev_deep(bond->dev,
790 vlan->vlan_id);
791 rcu_read_unlock();
792 if (vlan_dev)
793 __bond_resend_igmp_join_requests(vlan_dev);
794 }
795
796 if ((--bond->igmp_retrans > 0) && !bond->kill_timers)
797 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
798out:
799 read_unlock(&bond->lock);
800}
801
802static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
803{
804 struct bonding *bond = container_of(work, struct bonding,
805 mcast_work.work);
806 bond_resend_igmp_join_requests(bond);
807}
808
809/*
810 * flush all members of flush->mc_list from device dev->mc_list
811 */
812static void bond_mc_list_flush(struct net_device *bond_dev,
813 struct net_device *slave_dev)
814{
815 struct bonding *bond = netdev_priv(bond_dev);
816 struct netdev_hw_addr *ha;
817
818 netdev_for_each_mc_addr(ha, bond_dev)
819 dev_mc_del(slave_dev, ha->addr);
820
821 if (bond->params.mode == BOND_MODE_8023AD) {
822 /* del lacpdu mc addr from mc list */
823 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
824
825 dev_mc_del(slave_dev, lacpdu_multicast);
826 }
827}
828
829/*--------------------------- Active slave change ---------------------------*/
830
831/*
832 * Update the mc list and multicast-related flags for the new and
833 * old active slaves (if any) according to the multicast mode, and
834 * promiscuous flags unconditionally.
835 */
836static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
837 struct slave *old_active)
838{
839 struct netdev_hw_addr *ha;
840
841 if (!USES_PRIMARY(bond->params.mode))
842 /* nothing to do - mc list is already up-to-date on
843 * all slaves
844 */
845 return;
846
847 if (old_active) {
848 if (bond->dev->flags & IFF_PROMISC)
849 dev_set_promiscuity(old_active->dev, -1);
850
851 if (bond->dev->flags & IFF_ALLMULTI)
852 dev_set_allmulti(old_active->dev, -1);
853
854 netdev_for_each_mc_addr(ha, bond->dev)
855 dev_mc_del(old_active->dev, ha->addr);
856 }
857
858 if (new_active) {
859 /* FIXME: Signal errors upstream. */
860 if (bond->dev->flags & IFF_PROMISC)
861 dev_set_promiscuity(new_active->dev, 1);
862
863 if (bond->dev->flags & IFF_ALLMULTI)
864 dev_set_allmulti(new_active->dev, 1);
865
866 netdev_for_each_mc_addr(ha, bond->dev)
867 dev_mc_add(new_active->dev, ha->addr);
868 }
869}
870
871/*
872 * bond_do_fail_over_mac
873 *
874 * Perform special MAC address swapping for fail_over_mac settings
875 *
876 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
877 */
878static void bond_do_fail_over_mac(struct bonding *bond,
879 struct slave *new_active,
880 struct slave *old_active)
881 __releases(&bond->curr_slave_lock)
882 __releases(&bond->lock)
883 __acquires(&bond->lock)
884 __acquires(&bond->curr_slave_lock)
885{
886 u8 tmp_mac[ETH_ALEN];
887 struct sockaddr saddr;
888 int rv;
889
890 switch (bond->params.fail_over_mac) {
891 case BOND_FOM_ACTIVE:
892 if (new_active)
893 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
894 new_active->dev->addr_len);
895 break;
896 case BOND_FOM_FOLLOW:
897 /*
898 * if new_active && old_active, swap them
899 * if just old_active, do nothing (going to no active slave)
900 * if just new_active, set new_active to bond's MAC
901 */
902 if (!new_active)
903 return;
904
905 write_unlock_bh(&bond->curr_slave_lock);
906 read_unlock(&bond->lock);
907
908 if (old_active) {
909 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
910 memcpy(saddr.sa_data, old_active->dev->dev_addr,
911 ETH_ALEN);
912 saddr.sa_family = new_active->dev->type;
913 } else {
914 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
915 saddr.sa_family = bond->dev->type;
916 }
917
918 rv = dev_set_mac_address(new_active->dev, &saddr);
919 if (rv) {
920 pr_err("%s: Error %d setting MAC of slave %s\n",
921 bond->dev->name, -rv, new_active->dev->name);
922 goto out;
923 }
924
925 if (!old_active)
926 goto out;
927
928 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
929 saddr.sa_family = old_active->dev->type;
930
931 rv = dev_set_mac_address(old_active->dev, &saddr);
932 if (rv)
933 pr_err("%s: Error %d setting MAC of slave %s\n",
934 bond->dev->name, -rv, new_active->dev->name);
935out:
936 read_lock(&bond->lock);
937 write_lock_bh(&bond->curr_slave_lock);
938 break;
939 default:
940 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
941 bond->dev->name, bond->params.fail_over_mac);
942 break;
943 }
944
945}
946
947static bool bond_should_change_active(struct bonding *bond)
948{
949 struct slave *prim = bond->primary_slave;
950 struct slave *curr = bond->curr_active_slave;
951
952 if (!prim || !curr || curr->link != BOND_LINK_UP)
953 return true;
954 if (bond->force_primary) {
955 bond->force_primary = false;
956 return true;
957 }
958 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
959 (prim->speed < curr->speed ||
960 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
961 return false;
962 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
963 return false;
964 return true;
965}
966
967/**
968 * find_best_interface - select the best available slave to be the active one
969 * @bond: our bonding struct
970 *
971 * Warning: Caller must hold curr_slave_lock for writing.
972 */
973static struct slave *bond_find_best_slave(struct bonding *bond)
974{
975 struct slave *new_active, *old_active;
976 struct slave *bestslave = NULL;
977 int mintime = bond->params.updelay;
978 int i;
979
980 new_active = bond->curr_active_slave;
981
982 if (!new_active) { /* there were no active slaves left */
983 if (bond->slave_cnt > 0) /* found one slave */
984 new_active = bond->first_slave;
985 else
986 return NULL; /* still no slave, return NULL */
987 }
988
989 if ((bond->primary_slave) &&
990 bond->primary_slave->link == BOND_LINK_UP &&
991 bond_should_change_active(bond)) {
992 new_active = bond->primary_slave;
993 }
994
995 /* remember where to stop iterating over the slaves */
996 old_active = new_active;
997
998 bond_for_each_slave_from(bond, new_active, i, old_active) {
999 if (new_active->link == BOND_LINK_UP) {
1000 return new_active;
1001 } else if (new_active->link == BOND_LINK_BACK &&
1002 IS_UP(new_active->dev)) {
1003 /* link up, but waiting for stabilization */
1004 if (new_active->delay < mintime) {
1005 mintime = new_active->delay;
1006 bestslave = new_active;
1007 }
1008 }
1009 }
1010
1011 return bestslave;
1012}
1013
1014static bool bond_should_notify_peers(struct bonding *bond)
1015{
1016 struct slave *slave = bond->curr_active_slave;
1017
1018 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1019 bond->dev->name, slave ? slave->dev->name : "NULL");
1020
1021 if (!slave || !bond->send_peer_notif ||
1022 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1023 return false;
1024
1025 bond->send_peer_notif--;
1026 return true;
1027}
1028
1029/**
1030 * change_active_interface - change the active slave into the specified one
1031 * @bond: our bonding struct
1032 * @new: the new slave to make the active one
1033 *
1034 * Set the new slave to the bond's settings and unset them on the old
1035 * curr_active_slave.
1036 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1037 *
1038 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1039 * because it is apparently the best available slave we have, even though its
1040 * updelay hasn't timed out yet.
1041 *
1042 * If new_active is not NULL, caller must hold bond->lock for read and
1043 * curr_slave_lock for write_bh.
1044 */
1045void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1046{
1047 struct slave *old_active = bond->curr_active_slave;
1048
1049 if (old_active == new_active)
1050 return;
1051
1052 if (new_active) {
1053 new_active->jiffies = jiffies;
1054
1055 if (new_active->link == BOND_LINK_BACK) {
1056 if (USES_PRIMARY(bond->params.mode)) {
1057 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1058 bond->dev->name, new_active->dev->name,
1059 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1060 }
1061
1062 new_active->delay = 0;
1063 new_active->link = BOND_LINK_UP;
1064
1065 if (bond->params.mode == BOND_MODE_8023AD)
1066 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1067
1068 if (bond_is_lb(bond))
1069 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1070 } else {
1071 if (USES_PRIMARY(bond->params.mode)) {
1072 pr_info("%s: making interface %s the new active one.\n",
1073 bond->dev->name, new_active->dev->name);
1074 }
1075 }
1076 }
1077
1078 if (USES_PRIMARY(bond->params.mode))
1079 bond_mc_swap(bond, new_active, old_active);
1080
1081 if (bond_is_lb(bond)) {
1082 bond_alb_handle_active_change(bond, new_active);
1083 if (old_active)
1084 bond_set_slave_inactive_flags(old_active);
1085 if (new_active)
1086 bond_set_slave_active_flags(new_active);
1087 } else {
1088 bond->curr_active_slave = new_active;
1089 }
1090
1091 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1092 if (old_active)
1093 bond_set_slave_inactive_flags(old_active);
1094
1095 if (new_active) {
1096 bool should_notify_peers = false;
1097
1098 bond_set_slave_active_flags(new_active);
1099
1100 if (bond->params.fail_over_mac)
1101 bond_do_fail_over_mac(bond, new_active,
1102 old_active);
1103
1104 if (netif_running(bond->dev)) {
1105 bond->send_peer_notif =
1106 bond->params.num_peer_notif;
1107 should_notify_peers =
1108 bond_should_notify_peers(bond);
1109 }
1110
1111 write_unlock_bh(&bond->curr_slave_lock);
1112 read_unlock(&bond->lock);
1113
1114 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1115 if (should_notify_peers)
1116 netdev_bonding_change(bond->dev,
1117 NETDEV_NOTIFY_PEERS);
1118
1119 read_lock(&bond->lock);
1120 write_lock_bh(&bond->curr_slave_lock);
1121 }
1122 }
1123
1124 /* resend IGMP joins since active slave has changed or
1125 * all were sent on curr_active_slave.
1126 * resend only if bond is brought up with the affected
1127 * bonding modes and the retransmission is enabled */
1128 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1129 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1130 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1131 bond->igmp_retrans = bond->params.resend_igmp;
1132 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1133 }
1134}
1135
1136/**
1137 * bond_select_active_slave - select a new active slave, if needed
1138 * @bond: our bonding struct
1139 *
1140 * This functions should be called when one of the following occurs:
1141 * - The old curr_active_slave has been released or lost its link.
1142 * - The primary_slave has got its link back.
1143 * - A slave has got its link back and there's no old curr_active_slave.
1144 *
1145 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1146 */
1147void bond_select_active_slave(struct bonding *bond)
1148{
1149 struct slave *best_slave;
1150 int rv;
1151
1152 best_slave = bond_find_best_slave(bond);
1153 if (best_slave != bond->curr_active_slave) {
1154 bond_change_active_slave(bond, best_slave);
1155 rv = bond_set_carrier(bond);
1156 if (!rv)
1157 return;
1158
1159 if (netif_carrier_ok(bond->dev)) {
1160 pr_info("%s: first active interface up!\n",
1161 bond->dev->name);
1162 } else {
1163 pr_info("%s: now running without any active interface !\n",
1164 bond->dev->name);
1165 }
1166 }
1167}
1168
1169/*--------------------------- slave list handling ---------------------------*/
1170
1171/*
1172 * This function attaches the slave to the end of list.
1173 *
1174 * bond->lock held for writing by caller.
1175 */
1176static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1177{
1178 if (bond->first_slave == NULL) { /* attaching the first slave */
1179 new_slave->next = new_slave;
1180 new_slave->prev = new_slave;
1181 bond->first_slave = new_slave;
1182 } else {
1183 new_slave->next = bond->first_slave;
1184 new_slave->prev = bond->first_slave->prev;
1185 new_slave->next->prev = new_slave;
1186 new_slave->prev->next = new_slave;
1187 }
1188
1189 bond->slave_cnt++;
1190}
1191
1192/*
1193 * This function detaches the slave from the list.
1194 * WARNING: no check is made to verify if the slave effectively
1195 * belongs to <bond>.
1196 * Nothing is freed on return, structures are just unchained.
1197 * If any slave pointer in bond was pointing to <slave>,
1198 * it should be changed by the calling function.
1199 *
1200 * bond->lock held for writing by caller.
1201 */
1202static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1203{
1204 if (slave->next)
1205 slave->next->prev = slave->prev;
1206
1207 if (slave->prev)
1208 slave->prev->next = slave->next;
1209
1210 if (bond->first_slave == slave) { /* slave is the first slave */
1211 if (bond->slave_cnt > 1) { /* there are more slave */
1212 bond->first_slave = slave->next;
1213 } else {
1214 bond->first_slave = NULL; /* slave was the last one */
1215 }
1216 }
1217
1218 slave->next = NULL;
1219 slave->prev = NULL;
1220 bond->slave_cnt--;
1221}
1222
1223#ifdef CONFIG_NET_POLL_CONTROLLER
1224static inline int slave_enable_netpoll(struct slave *slave)
1225{
1226 struct netpoll *np;
1227 int err = 0;
1228
1229 np = kzalloc(sizeof(*np), GFP_KERNEL);
1230 err = -ENOMEM;
1231 if (!np)
1232 goto out;
1233
1234 np->dev = slave->dev;
1235 strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1236 err = __netpoll_setup(np);
1237 if (err) {
1238 kfree(np);
1239 goto out;
1240 }
1241 slave->np = np;
1242out:
1243 return err;
1244}
1245static inline void slave_disable_netpoll(struct slave *slave)
1246{
1247 struct netpoll *np = slave->np;
1248
1249 if (!np)
1250 return;
1251
1252 slave->np = NULL;
1253 synchronize_rcu_bh();
1254 __netpoll_cleanup(np);
1255 kfree(np);
1256}
1257static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1258{
1259 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1260 return false;
1261 if (!slave_dev->netdev_ops->ndo_poll_controller)
1262 return false;
1263 return true;
1264}
1265
1266static void bond_poll_controller(struct net_device *bond_dev)
1267{
1268}
1269
1270static void __bond_netpoll_cleanup(struct bonding *bond)
1271{
1272 struct slave *slave;
1273 int i;
1274
1275 bond_for_each_slave(bond, slave, i)
1276 if (IS_UP(slave->dev))
1277 slave_disable_netpoll(slave);
1278}
1279static void bond_netpoll_cleanup(struct net_device *bond_dev)
1280{
1281 struct bonding *bond = netdev_priv(bond_dev);
1282
1283 read_lock(&bond->lock);
1284 __bond_netpoll_cleanup(bond);
1285 read_unlock(&bond->lock);
1286}
1287
1288static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1289{
1290 struct bonding *bond = netdev_priv(dev);
1291 struct slave *slave;
1292 int i, err = 0;
1293
1294 read_lock(&bond->lock);
1295 bond_for_each_slave(bond, slave, i) {
1296 err = slave_enable_netpoll(slave);
1297 if (err) {
1298 __bond_netpoll_cleanup(bond);
1299 break;
1300 }
1301 }
1302 read_unlock(&bond->lock);
1303 return err;
1304}
1305
1306static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1307{
1308 return bond->dev->npinfo;
1309}
1310
1311#else
1312static inline int slave_enable_netpoll(struct slave *slave)
1313{
1314 return 0;
1315}
1316static inline void slave_disable_netpoll(struct slave *slave)
1317{
1318}
1319static void bond_netpoll_cleanup(struct net_device *bond_dev)
1320{
1321}
1322#endif
1323
1324/*---------------------------------- IOCTL ----------------------------------*/
1325
1326static int bond_sethwaddr(struct net_device *bond_dev,
1327 struct net_device *slave_dev)
1328{
1329 pr_debug("bond_dev=%p\n", bond_dev);
1330 pr_debug("slave_dev=%p\n", slave_dev);
1331 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1332 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1333 return 0;
1334}
1335
1336static u32 bond_fix_features(struct net_device *dev, u32 features)
1337{
1338 struct slave *slave;
1339 struct bonding *bond = netdev_priv(dev);
1340 u32 mask;
1341 int i;
1342
1343 read_lock(&bond->lock);
1344
1345 if (!bond->first_slave) {
1346 /* Disable adding VLANs to empty bond. But why? --mq */
1347 features |= NETIF_F_VLAN_CHALLENGED;
1348 goto out;
1349 }
1350
1351 mask = features;
1352 features &= ~NETIF_F_ONE_FOR_ALL;
1353 features |= NETIF_F_ALL_FOR_ALL;
1354
1355 bond_for_each_slave(bond, slave, i) {
1356 features = netdev_increment_features(features,
1357 slave->dev->features,
1358 mask);
1359 }
1360
1361out:
1362 read_unlock(&bond->lock);
1363 return features;
1364}
1365
1366#define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1367 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1368 NETIF_F_HIGHDMA | NETIF_F_LRO)
1369
1370static void bond_compute_features(struct bonding *bond)
1371{
1372 struct slave *slave;
1373 struct net_device *bond_dev = bond->dev;
1374 u32 vlan_features = BOND_VLAN_FEATURES;
1375 unsigned short max_hard_header_len = ETH_HLEN;
1376 int i;
1377
1378 read_lock(&bond->lock);
1379
1380 if (!bond->first_slave)
1381 goto done;
1382
1383 bond_for_each_slave(bond, slave, i) {
1384 vlan_features = netdev_increment_features(vlan_features,
1385 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1386
1387 if (slave->dev->hard_header_len > max_hard_header_len)
1388 max_hard_header_len = slave->dev->hard_header_len;
1389 }
1390
1391done:
1392 bond_dev->vlan_features = vlan_features;
1393 bond_dev->hard_header_len = max_hard_header_len;
1394
1395 read_unlock(&bond->lock);
1396
1397 netdev_change_features(bond_dev);
1398}
1399
1400static void bond_setup_by_slave(struct net_device *bond_dev,
1401 struct net_device *slave_dev)
1402{
1403 struct bonding *bond = netdev_priv(bond_dev);
1404
1405 bond_dev->header_ops = slave_dev->header_ops;
1406
1407 bond_dev->type = slave_dev->type;
1408 bond_dev->hard_header_len = slave_dev->hard_header_len;
1409 bond_dev->addr_len = slave_dev->addr_len;
1410
1411 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1412 slave_dev->addr_len);
1413 bond->setup_by_slave = 1;
1414}
1415
1416/* On bonding slaves other than the currently active slave, suppress
1417 * duplicates except for alb non-mcast/bcast.
1418 */
1419static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1420 struct slave *slave,
1421 struct bonding *bond)
1422{
1423 if (bond_is_slave_inactive(slave)) {
1424 if (bond->params.mode == BOND_MODE_ALB &&
1425 skb->pkt_type != PACKET_BROADCAST &&
1426 skb->pkt_type != PACKET_MULTICAST)
1427 return false;
1428 return true;
1429 }
1430 return false;
1431}
1432
1433static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1434{
1435 struct sk_buff *skb = *pskb;
1436 struct slave *slave;
1437 struct bonding *bond;
1438 void (*recv_probe)(struct sk_buff *, struct bonding *,
1439 struct slave *);
1440
1441 skb = skb_share_check(skb, GFP_ATOMIC);
1442 if (unlikely(!skb))
1443 return RX_HANDLER_CONSUMED;
1444
1445 *pskb = skb;
1446
1447 slave = bond_slave_get_rcu(skb->dev);
1448 bond = slave->bond;
1449
1450 if (bond->params.arp_interval)
1451 slave->dev->last_rx = jiffies;
1452
1453 recv_probe = ACCESS_ONCE(bond->recv_probe);
1454 if (recv_probe) {
1455 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1456
1457 if (likely(nskb)) {
1458 recv_probe(nskb, bond, slave);
1459 dev_kfree_skb(nskb);
1460 }
1461 }
1462
1463 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1464 return RX_HANDLER_EXACT;
1465 }
1466
1467 skb->dev = bond->dev;
1468
1469 if (bond->params.mode == BOND_MODE_ALB &&
1470 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1471 skb->pkt_type == PACKET_HOST) {
1472
1473 if (unlikely(skb_cow_head(skb,
1474 skb->data - skb_mac_header(skb)))) {
1475 kfree_skb(skb);
1476 return RX_HANDLER_CONSUMED;
1477 }
1478 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1479 }
1480
1481 return RX_HANDLER_ANOTHER;
1482}
1483
1484/* enslave device <slave> to bond device <master> */
1485int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1486{
1487 struct bonding *bond = netdev_priv(bond_dev);
1488 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1489 struct slave *new_slave = NULL;
1490 struct netdev_hw_addr *ha;
1491 struct sockaddr addr;
1492 int link_reporting;
1493 int res = 0;
1494
1495 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1496 slave_ops->ndo_do_ioctl == NULL) {
1497 pr_warning("%s: Warning: no link monitoring support for %s\n",
1498 bond_dev->name, slave_dev->name);
1499 }
1500
1501 /* already enslaved */
1502 if (slave_dev->flags & IFF_SLAVE) {
1503 pr_debug("Error, Device was already enslaved\n");
1504 return -EBUSY;
1505 }
1506
1507 /* vlan challenged mutual exclusion */
1508 /* no need to lock since we're protected by rtnl_lock */
1509 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1510 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1511 if (bond_vlan_used(bond)) {
1512 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1513 bond_dev->name, slave_dev->name, bond_dev->name);
1514 return -EPERM;
1515 } else {
1516 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1517 bond_dev->name, slave_dev->name,
1518 slave_dev->name, bond_dev->name);
1519 }
1520 } else {
1521 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1522 }
1523
1524 /*
1525 * Old ifenslave binaries are no longer supported. These can
1526 * be identified with moderate accuracy by the state of the slave:
1527 * the current ifenslave will set the interface down prior to
1528 * enslaving it; the old ifenslave will not.
1529 */
1530 if ((slave_dev->flags & IFF_UP)) {
1531 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1532 slave_dev->name);
1533 res = -EPERM;
1534 goto err_undo_flags;
1535 }
1536
1537 /* set bonding device ether type by slave - bonding netdevices are
1538 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1539 * there is a need to override some of the type dependent attribs/funcs.
1540 *
1541 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1542 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1543 */
1544 if (bond->slave_cnt == 0) {
1545 if (bond_dev->type != slave_dev->type) {
1546 pr_debug("%s: change device type from %d to %d\n",
1547 bond_dev->name,
1548 bond_dev->type, slave_dev->type);
1549
1550 res = netdev_bonding_change(bond_dev,
1551 NETDEV_PRE_TYPE_CHANGE);
1552 res = notifier_to_errno(res);
1553 if (res) {
1554 pr_err("%s: refused to change device type\n",
1555 bond_dev->name);
1556 res = -EBUSY;
1557 goto err_undo_flags;
1558 }
1559
1560 /* Flush unicast and multicast addresses */
1561 dev_uc_flush(bond_dev);
1562 dev_mc_flush(bond_dev);
1563
1564 if (slave_dev->type != ARPHRD_ETHER)
1565 bond_setup_by_slave(bond_dev, slave_dev);
1566 else {
1567 ether_setup(bond_dev);
1568 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1569 }
1570
1571 netdev_bonding_change(bond_dev,
1572 NETDEV_POST_TYPE_CHANGE);
1573 }
1574 } else if (bond_dev->type != slave_dev->type) {
1575 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1576 slave_dev->name,
1577 slave_dev->type, bond_dev->type);
1578 res = -EINVAL;
1579 goto err_undo_flags;
1580 }
1581
1582 if (slave_ops->ndo_set_mac_address == NULL) {
1583 if (bond->slave_cnt == 0) {
1584 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1585 bond_dev->name);
1586 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1587 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1588 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",
1589 bond_dev->name);
1590 res = -EOPNOTSUPP;
1591 goto err_undo_flags;
1592 }
1593 }
1594
1595 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1596
1597 /* If this is the first slave, then we need to set the master's hardware
1598 * address to be the same as the slave's. */
1599 if (is_zero_ether_addr(bond->dev->dev_addr))
1600 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1601 slave_dev->addr_len);
1602
1603
1604 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1605 if (!new_slave) {
1606 res = -ENOMEM;
1607 goto err_undo_flags;
1608 }
1609
1610 /*
1611 * Set the new_slave's queue_id to be zero. Queue ID mapping
1612 * is set via sysfs or module option if desired.
1613 */
1614 new_slave->queue_id = 0;
1615
1616 /* Save slave's original mtu and then set it to match the bond */
1617 new_slave->original_mtu = slave_dev->mtu;
1618 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1619 if (res) {
1620 pr_debug("Error %d calling dev_set_mtu\n", res);
1621 goto err_free;
1622 }
1623
1624 /*
1625 * Save slave's original ("permanent") mac address for modes
1626 * that need it, and for restoring it upon release, and then
1627 * set it to the master's address
1628 */
1629 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1630
1631 if (!bond->params.fail_over_mac) {
1632 /*
1633 * Set slave to master's mac address. The application already
1634 * set the master's mac address to that of the first slave
1635 */
1636 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1637 addr.sa_family = slave_dev->type;
1638 res = dev_set_mac_address(slave_dev, &addr);
1639 if (res) {
1640 pr_debug("Error %d calling set_mac_address\n", res);
1641 goto err_restore_mtu;
1642 }
1643 }
1644
1645 res = netdev_set_bond_master(slave_dev, bond_dev);
1646 if (res) {
1647 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1648 goto err_restore_mac;
1649 }
1650
1651 /* open the slave since the application closed it */
1652 res = dev_open(slave_dev);
1653 if (res) {
1654 pr_debug("Opening slave %s failed\n", slave_dev->name);
1655 goto err_unset_master;
1656 }
1657
1658 new_slave->bond = bond;
1659 new_slave->dev = slave_dev;
1660 slave_dev->priv_flags |= IFF_BONDING;
1661
1662 if (bond_is_lb(bond)) {
1663 /* bond_alb_init_slave() must be called before all other stages since
1664 * it might fail and we do not want to have to undo everything
1665 */
1666 res = bond_alb_init_slave(bond, new_slave);
1667 if (res)
1668 goto err_close;
1669 }
1670
1671 /* If the mode USES_PRIMARY, then the new slave gets the
1672 * master's promisc (and mc) settings only if it becomes the
1673 * curr_active_slave, and that is taken care of later when calling
1674 * bond_change_active()
1675 */
1676 if (!USES_PRIMARY(bond->params.mode)) {
1677 /* set promiscuity level to new slave */
1678 if (bond_dev->flags & IFF_PROMISC) {
1679 res = dev_set_promiscuity(slave_dev, 1);
1680 if (res)
1681 goto err_close;
1682 }
1683
1684 /* set allmulti level to new slave */
1685 if (bond_dev->flags & IFF_ALLMULTI) {
1686 res = dev_set_allmulti(slave_dev, 1);
1687 if (res)
1688 goto err_close;
1689 }
1690
1691 netif_addr_lock_bh(bond_dev);
1692 /* upload master's mc_list to new slave */
1693 netdev_for_each_mc_addr(ha, bond_dev)
1694 dev_mc_add(slave_dev, ha->addr);
1695 netif_addr_unlock_bh(bond_dev);
1696 }
1697
1698 if (bond->params.mode == BOND_MODE_8023AD) {
1699 /* add lacpdu mc addr to mc list */
1700 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1701
1702 dev_mc_add(slave_dev, lacpdu_multicast);
1703 }
1704
1705 bond_add_vlans_on_slave(bond, slave_dev);
1706
1707 write_lock_bh(&bond->lock);
1708
1709 bond_attach_slave(bond, new_slave);
1710
1711 new_slave->delay = 0;
1712 new_slave->link_failure_count = 0;
1713
1714 write_unlock_bh(&bond->lock);
1715
1716 bond_compute_features(bond);
1717
1718 read_lock(&bond->lock);
1719
1720 new_slave->last_arp_rx = jiffies;
1721
1722 if (bond->params.miimon && !bond->params.use_carrier) {
1723 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1724
1725 if ((link_reporting == -1) && !bond->params.arp_interval) {
1726 /*
1727 * miimon is set but a bonded network driver
1728 * does not support ETHTOOL/MII and
1729 * arp_interval is not set. Note: if
1730 * use_carrier is enabled, we will never go
1731 * here (because netif_carrier is always
1732 * supported); thus, we don't need to change
1733 * the messages for netif_carrier.
1734 */
1735 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",
1736 bond_dev->name, slave_dev->name);
1737 } else if (link_reporting == -1) {
1738 /* unable get link status using mii/ethtool */
1739 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",
1740 bond_dev->name, slave_dev->name);
1741 }
1742 }
1743
1744 /* check for initial state */
1745 if (!bond->params.miimon ||
1746 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1747 if (bond->params.updelay) {
1748 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1749 new_slave->link = BOND_LINK_BACK;
1750 new_slave->delay = bond->params.updelay;
1751 } else {
1752 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1753 new_slave->link = BOND_LINK_UP;
1754 }
1755 new_slave->jiffies = jiffies;
1756 } else {
1757 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1758 new_slave->link = BOND_LINK_DOWN;
1759 }
1760
1761 if (bond_update_speed_duplex(new_slave) &&
1762 (new_slave->link != BOND_LINK_DOWN)) {
1763 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1764 bond_dev->name, new_slave->dev->name);
1765
1766 if (bond->params.mode == BOND_MODE_8023AD) {
1767 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1768 bond_dev->name);
1769 }
1770 }
1771
1772 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1773 /* if there is a primary slave, remember it */
1774 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1775 bond->primary_slave = new_slave;
1776 bond->force_primary = true;
1777 }
1778 }
1779
1780 write_lock_bh(&bond->curr_slave_lock);
1781
1782 switch (bond->params.mode) {
1783 case BOND_MODE_ACTIVEBACKUP:
1784 bond_set_slave_inactive_flags(new_slave);
1785 bond_select_active_slave(bond);
1786 break;
1787 case BOND_MODE_8023AD:
1788 /* in 802.3ad mode, the internal mechanism
1789 * will activate the slaves in the selected
1790 * aggregator
1791 */
1792 bond_set_slave_inactive_flags(new_slave);
1793 /* if this is the first slave */
1794 if (bond->slave_cnt == 1) {
1795 SLAVE_AD_INFO(new_slave).id = 1;
1796 /* Initialize AD with the number of times that the AD timer is called in 1 second
1797 * can be called only after the mac address of the bond is set
1798 */
1799 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1800 } else {
1801 SLAVE_AD_INFO(new_slave).id =
1802 SLAVE_AD_INFO(new_slave->prev).id + 1;
1803 }
1804
1805 bond_3ad_bind_slave(new_slave);
1806 break;
1807 case BOND_MODE_TLB:
1808 case BOND_MODE_ALB:
1809 bond_set_active_slave(new_slave);
1810 bond_set_slave_inactive_flags(new_slave);
1811 bond_select_active_slave(bond);
1812 break;
1813 default:
1814 pr_debug("This slave is always active in trunk mode\n");
1815
1816 /* always active in trunk mode */
1817 bond_set_active_slave(new_slave);
1818
1819 /* In trunking mode there is little meaning to curr_active_slave
1820 * anyway (it holds no special properties of the bond device),
1821 * so we can change it without calling change_active_interface()
1822 */
1823 if (!bond->curr_active_slave)
1824 bond->curr_active_slave = new_slave;
1825
1826 break;
1827 } /* switch(bond_mode) */
1828
1829 write_unlock_bh(&bond->curr_slave_lock);
1830
1831 bond_set_carrier(bond);
1832
1833#ifdef CONFIG_NET_POLL_CONTROLLER
1834 slave_dev->npinfo = bond_netpoll_info(bond);
1835 if (slave_dev->npinfo) {
1836 if (slave_enable_netpoll(new_slave)) {
1837 read_unlock(&bond->lock);
1838 pr_info("Error, %s: master_dev is using netpoll, "
1839 "but new slave device does not support netpoll.\n",
1840 bond_dev->name);
1841 res = -EBUSY;
1842 goto err_close;
1843 }
1844 }
1845#endif
1846
1847 read_unlock(&bond->lock);
1848
1849 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1850 if (res)
1851 goto err_close;
1852
1853 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1854 new_slave);
1855 if (res) {
1856 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1857 goto err_dest_symlinks;
1858 }
1859
1860 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1861 bond_dev->name, slave_dev->name,
1862 bond_is_active_slave(new_slave) ? "n active" : " backup",
1863 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1864
1865 /* enslave is successful */
1866 return 0;
1867
1868/* Undo stages on error */
1869err_dest_symlinks:
1870 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1871
1872err_close:
1873 dev_close(slave_dev);
1874
1875err_unset_master:
1876 netdev_set_bond_master(slave_dev, NULL);
1877
1878err_restore_mac:
1879 if (!bond->params.fail_over_mac) {
1880 /* XXX TODO - fom follow mode needs to change master's
1881 * MAC if this slave's MAC is in use by the bond, or at
1882 * least print a warning.
1883 */
1884 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1885 addr.sa_family = slave_dev->type;
1886 dev_set_mac_address(slave_dev, &addr);
1887 }
1888
1889err_restore_mtu:
1890 dev_set_mtu(slave_dev, new_slave->original_mtu);
1891
1892err_free:
1893 kfree(new_slave);
1894
1895err_undo_flags:
1896 bond_compute_features(bond);
1897
1898 return res;
1899}
1900
1901/*
1902 * Try to release the slave device <slave> from the bond device <master>
1903 * It is legal to access curr_active_slave without a lock because all the function
1904 * is write-locked.
1905 *
1906 * The rules for slave state should be:
1907 * for Active/Backup:
1908 * Active stays on all backups go down
1909 * for Bonded connections:
1910 * The first up interface should be left on and all others downed.
1911 */
1912int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1913{
1914 struct bonding *bond = netdev_priv(bond_dev);
1915 struct slave *slave, *oldcurrent;
1916 struct sockaddr addr;
1917 u32 old_features = bond_dev->features;
1918
1919 /* slave is not a slave or master is not master of this slave */
1920 if (!(slave_dev->flags & IFF_SLAVE) ||
1921 (slave_dev->master != bond_dev)) {
1922 pr_err("%s: Error: cannot release %s.\n",
1923 bond_dev->name, slave_dev->name);
1924 return -EINVAL;
1925 }
1926
1927 block_netpoll_tx();
1928 netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1929 write_lock_bh(&bond->lock);
1930
1931 slave = bond_get_slave_by_dev(bond, slave_dev);
1932 if (!slave) {
1933 /* not a slave of this bond */
1934 pr_info("%s: %s not enslaved\n",
1935 bond_dev->name, slave_dev->name);
1936 write_unlock_bh(&bond->lock);
1937 unblock_netpoll_tx();
1938 return -EINVAL;
1939 }
1940
1941 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1942 * for this slave anymore.
1943 */
1944 netdev_rx_handler_unregister(slave_dev);
1945 write_unlock_bh(&bond->lock);
1946 synchronize_net();
1947 write_lock_bh(&bond->lock);
1948
1949 if (!bond->params.fail_over_mac) {
1950 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1951 bond->slave_cnt > 1)
1952 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",
1953 bond_dev->name, slave_dev->name,
1954 slave->perm_hwaddr,
1955 bond_dev->name, slave_dev->name);
1956 }
1957
1958 /* Inform AD package of unbinding of slave. */
1959 if (bond->params.mode == BOND_MODE_8023AD) {
1960 /* must be called before the slave is
1961 * detached from the list
1962 */
1963 bond_3ad_unbind_slave(slave);
1964 }
1965
1966 pr_info("%s: releasing %s interface %s\n",
1967 bond_dev->name,
1968 bond_is_active_slave(slave) ? "active" : "backup",
1969 slave_dev->name);
1970
1971 oldcurrent = bond->curr_active_slave;
1972
1973 bond->current_arp_slave = NULL;
1974
1975 /* release the slave from its bond */
1976 bond_detach_slave(bond, slave);
1977
1978 if (bond->primary_slave == slave)
1979 bond->primary_slave = NULL;
1980
1981 if (oldcurrent == slave)
1982 bond_change_active_slave(bond, NULL);
1983
1984 if (bond_is_lb(bond)) {
1985 /* Must be called only after the slave has been
1986 * detached from the list and the curr_active_slave
1987 * has been cleared (if our_slave == old_current),
1988 * but before a new active slave is selected.
1989 */
1990 write_unlock_bh(&bond->lock);
1991 bond_alb_deinit_slave(bond, slave);
1992 write_lock_bh(&bond->lock);
1993 }
1994
1995 if (oldcurrent == slave) {
1996 /*
1997 * Note that we hold RTNL over this sequence, so there
1998 * is no concern that another slave add/remove event
1999 * will interfere.
2000 */
2001 write_unlock_bh(&bond->lock);
2002 read_lock(&bond->lock);
2003 write_lock_bh(&bond->curr_slave_lock);
2004
2005 bond_select_active_slave(bond);
2006
2007 write_unlock_bh(&bond->curr_slave_lock);
2008 read_unlock(&bond->lock);
2009 write_lock_bh(&bond->lock);
2010 }
2011
2012 if (bond->slave_cnt == 0) {
2013 bond_set_carrier(bond);
2014
2015 /* if the last slave was removed, zero the mac address
2016 * of the master so it will be set by the application
2017 * to the mac address of the first slave
2018 */
2019 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2020
2021 if (bond_vlan_used(bond)) {
2022 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2023 bond_dev->name, bond_dev->name);
2024 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2025 bond_dev->name);
2026 }
2027 }
2028
2029 write_unlock_bh(&bond->lock);
2030 unblock_netpoll_tx();
2031
2032 bond_compute_features(bond);
2033 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2034 (old_features & NETIF_F_VLAN_CHALLENGED))
2035 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2036 bond_dev->name, slave_dev->name, bond_dev->name);
2037
2038 /* must do this from outside any spinlocks */
2039 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2040
2041 bond_del_vlans_from_slave(bond, slave_dev);
2042
2043 /* If the mode USES_PRIMARY, then we should only remove its
2044 * promisc and mc settings if it was the curr_active_slave, but that was
2045 * already taken care of above when we detached the slave
2046 */
2047 if (!USES_PRIMARY(bond->params.mode)) {
2048 /* unset promiscuity level from slave */
2049 if (bond_dev->flags & IFF_PROMISC)
2050 dev_set_promiscuity(slave_dev, -1);
2051
2052 /* unset allmulti level from slave */
2053 if (bond_dev->flags & IFF_ALLMULTI)
2054 dev_set_allmulti(slave_dev, -1);
2055
2056 /* flush master's mc_list from slave */
2057 netif_addr_lock_bh(bond_dev);
2058 bond_mc_list_flush(bond_dev, slave_dev);
2059 netif_addr_unlock_bh(bond_dev);
2060 }
2061
2062 netdev_set_bond_master(slave_dev, NULL);
2063
2064 slave_disable_netpoll(slave);
2065
2066 /* close slave before restoring its mac address */
2067 dev_close(slave_dev);
2068
2069 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2070 /* restore original ("permanent") mac address */
2071 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2072 addr.sa_family = slave_dev->type;
2073 dev_set_mac_address(slave_dev, &addr);
2074 }
2075
2076 dev_set_mtu(slave_dev, slave->original_mtu);
2077
2078 slave_dev->priv_flags &= ~IFF_BONDING;
2079
2080 kfree(slave);
2081
2082 return 0; /* deletion OK */
2083}
2084
2085/*
2086* First release a slave and then destroy the bond if no more slaves are left.
2087* Must be under rtnl_lock when this function is called.
2088*/
2089static int bond_release_and_destroy(struct net_device *bond_dev,
2090 struct net_device *slave_dev)
2091{
2092 struct bonding *bond = netdev_priv(bond_dev);
2093 int ret;
2094
2095 ret = bond_release(bond_dev, slave_dev);
2096 if ((ret == 0) && (bond->slave_cnt == 0)) {
2097 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2098 pr_info("%s: destroying bond %s.\n",
2099 bond_dev->name, bond_dev->name);
2100 unregister_netdevice(bond_dev);
2101 }
2102 return ret;
2103}
2104
2105/*
2106 * This function releases all slaves.
2107 */
2108static int bond_release_all(struct net_device *bond_dev)
2109{
2110 struct bonding *bond = netdev_priv(bond_dev);
2111 struct slave *slave;
2112 struct net_device *slave_dev;
2113 struct sockaddr addr;
2114
2115 write_lock_bh(&bond->lock);
2116
2117 netif_carrier_off(bond_dev);
2118
2119 if (bond->slave_cnt == 0)
2120 goto out;
2121
2122 bond->current_arp_slave = NULL;
2123 bond->primary_slave = NULL;
2124 bond_change_active_slave(bond, NULL);
2125
2126 while ((slave = bond->first_slave) != NULL) {
2127 /* Inform AD package of unbinding of slave
2128 * before slave is detached from the list.
2129 */
2130 if (bond->params.mode == BOND_MODE_8023AD)
2131 bond_3ad_unbind_slave(slave);
2132
2133 slave_dev = slave->dev;
2134 bond_detach_slave(bond, slave);
2135
2136 /* now that the slave is detached, unlock and perform
2137 * all the undo steps that should not be called from
2138 * within a lock.
2139 */
2140 write_unlock_bh(&bond->lock);
2141
2142 /* unregister rx_handler early so bond_handle_frame wouldn't
2143 * be called for this slave anymore.
2144 */
2145 netdev_rx_handler_unregister(slave_dev);
2146 synchronize_net();
2147
2148 if (bond_is_lb(bond)) {
2149 /* must be called only after the slave
2150 * has been detached from the list
2151 */
2152 bond_alb_deinit_slave(bond, slave);
2153 }
2154
2155 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2156 bond_del_vlans_from_slave(bond, slave_dev);
2157
2158 /* If the mode USES_PRIMARY, then we should only remove its
2159 * promisc and mc settings if it was the curr_active_slave, but that was
2160 * already taken care of above when we detached the slave
2161 */
2162 if (!USES_PRIMARY(bond->params.mode)) {
2163 /* unset promiscuity level from slave */
2164 if (bond_dev->flags & IFF_PROMISC)
2165 dev_set_promiscuity(slave_dev, -1);
2166
2167 /* unset allmulti level from slave */
2168 if (bond_dev->flags & IFF_ALLMULTI)
2169 dev_set_allmulti(slave_dev, -1);
2170
2171 /* flush master's mc_list from slave */
2172 netif_addr_lock_bh(bond_dev);
2173 bond_mc_list_flush(bond_dev, slave_dev);
2174 netif_addr_unlock_bh(bond_dev);
2175 }
2176
2177 netdev_set_bond_master(slave_dev, NULL);
2178
2179 slave_disable_netpoll(slave);
2180
2181 /* close slave before restoring its mac address */
2182 dev_close(slave_dev);
2183
2184 if (!bond->params.fail_over_mac) {
2185 /* restore original ("permanent") mac address*/
2186 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2187 addr.sa_family = slave_dev->type;
2188 dev_set_mac_address(slave_dev, &addr);
2189 }
2190
2191 kfree(slave);
2192
2193 /* re-acquire the lock before getting the next slave */
2194 write_lock_bh(&bond->lock);
2195 }
2196
2197 /* zero the mac address of the master so it will be
2198 * set by the application to the mac address of the
2199 * first slave
2200 */
2201 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2202
2203 if (bond_vlan_used(bond)) {
2204 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2205 bond_dev->name, bond_dev->name);
2206 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2207 bond_dev->name);
2208 }
2209
2210 pr_info("%s: released all slaves\n", bond_dev->name);
2211
2212out:
2213 write_unlock_bh(&bond->lock);
2214
2215 bond_compute_features(bond);
2216
2217 return 0;
2218}
2219
2220/*
2221 * This function changes the active slave to slave <slave_dev>.
2222 * It returns -EINVAL in the following cases.
2223 * - <slave_dev> is not found in the list.
2224 * - There is not active slave now.
2225 * - <slave_dev> is already active.
2226 * - The link state of <slave_dev> is not BOND_LINK_UP.
2227 * - <slave_dev> is not running.
2228 * In these cases, this function does nothing.
2229 * In the other cases, current_slave pointer is changed and 0 is returned.
2230 */
2231static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2232{
2233 struct bonding *bond = netdev_priv(bond_dev);
2234 struct slave *old_active = NULL;
2235 struct slave *new_active = NULL;
2236 int res = 0;
2237
2238 if (!USES_PRIMARY(bond->params.mode))
2239 return -EINVAL;
2240
2241 /* Verify that master_dev is indeed the master of slave_dev */
2242 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2243 return -EINVAL;
2244
2245 read_lock(&bond->lock);
2246
2247 read_lock(&bond->curr_slave_lock);
2248 old_active = bond->curr_active_slave;
2249 read_unlock(&bond->curr_slave_lock);
2250
2251 new_active = bond_get_slave_by_dev(bond, slave_dev);
2252
2253 /*
2254 * Changing to the current active: do nothing; return success.
2255 */
2256 if (new_active && (new_active == old_active)) {
2257 read_unlock(&bond->lock);
2258 return 0;
2259 }
2260
2261 if ((new_active) &&
2262 (old_active) &&
2263 (new_active->link == BOND_LINK_UP) &&
2264 IS_UP(new_active->dev)) {
2265 block_netpoll_tx();
2266 write_lock_bh(&bond->curr_slave_lock);
2267 bond_change_active_slave(bond, new_active);
2268 write_unlock_bh(&bond->curr_slave_lock);
2269 unblock_netpoll_tx();
2270 } else
2271 res = -EINVAL;
2272
2273 read_unlock(&bond->lock);
2274
2275 return res;
2276}
2277
2278static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2279{
2280 struct bonding *bond = netdev_priv(bond_dev);
2281
2282 info->bond_mode = bond->params.mode;
2283 info->miimon = bond->params.miimon;
2284
2285 read_lock(&bond->lock);
2286 info->num_slaves = bond->slave_cnt;
2287 read_unlock(&bond->lock);
2288
2289 return 0;
2290}
2291
2292static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2293{
2294 struct bonding *bond = netdev_priv(bond_dev);
2295 struct slave *slave;
2296 int i, res = -ENODEV;
2297
2298 read_lock(&bond->lock);
2299
2300 bond_for_each_slave(bond, slave, i) {
2301 if (i == (int)info->slave_id) {
2302 res = 0;
2303 strcpy(info->slave_name, slave->dev->name);
2304 info->link = slave->link;
2305 info->state = bond_slave_state(slave);
2306 info->link_failure_count = slave->link_failure_count;
2307 break;
2308 }
2309 }
2310
2311 read_unlock(&bond->lock);
2312
2313 return res;
2314}
2315
2316/*-------------------------------- Monitoring -------------------------------*/
2317
2318
2319static int bond_miimon_inspect(struct bonding *bond)
2320{
2321 struct slave *slave;
2322 int i, link_state, commit = 0;
2323 bool ignore_updelay;
2324
2325 ignore_updelay = !bond->curr_active_slave ? true : false;
2326
2327 bond_for_each_slave(bond, slave, i) {
2328 slave->new_link = BOND_LINK_NOCHANGE;
2329
2330 link_state = bond_check_dev_link(bond, slave->dev, 0);
2331
2332 switch (slave->link) {
2333 case BOND_LINK_UP:
2334 if (link_state)
2335 continue;
2336
2337 slave->link = BOND_LINK_FAIL;
2338 slave->delay = bond->params.downdelay;
2339 if (slave->delay) {
2340 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2341 bond->dev->name,
2342 (bond->params.mode ==
2343 BOND_MODE_ACTIVEBACKUP) ?
2344 (bond_is_active_slave(slave) ?
2345 "active " : "backup ") : "",
2346 slave->dev->name,
2347 bond->params.downdelay * bond->params.miimon);
2348 }
2349 /*FALLTHRU*/
2350 case BOND_LINK_FAIL:
2351 if (link_state) {
2352 /*
2353 * recovered before downdelay expired
2354 */
2355 slave->link = BOND_LINK_UP;
2356 slave->jiffies = jiffies;
2357 pr_info("%s: link status up again after %d ms for interface %s.\n",
2358 bond->dev->name,
2359 (bond->params.downdelay - slave->delay) *
2360 bond->params.miimon,
2361 slave->dev->name);
2362 continue;
2363 }
2364
2365 if (slave->delay <= 0) {
2366 slave->new_link = BOND_LINK_DOWN;
2367 commit++;
2368 continue;
2369 }
2370
2371 slave->delay--;
2372 break;
2373
2374 case BOND_LINK_DOWN:
2375 if (!link_state)
2376 continue;
2377
2378 slave->link = BOND_LINK_BACK;
2379 slave->delay = bond->params.updelay;
2380
2381 if (slave->delay) {
2382 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2383 bond->dev->name, slave->dev->name,
2384 ignore_updelay ? 0 :
2385 bond->params.updelay *
2386 bond->params.miimon);
2387 }
2388 /*FALLTHRU*/
2389 case BOND_LINK_BACK:
2390 if (!link_state) {
2391 slave->link = BOND_LINK_DOWN;
2392 pr_info("%s: link status down again after %d ms for interface %s.\n",
2393 bond->dev->name,
2394 (bond->params.updelay - slave->delay) *
2395 bond->params.miimon,
2396 slave->dev->name);
2397
2398 continue;
2399 }
2400
2401 if (ignore_updelay)
2402 slave->delay = 0;
2403
2404 if (slave->delay <= 0) {
2405 slave->new_link = BOND_LINK_UP;
2406 commit++;
2407 ignore_updelay = false;
2408 continue;
2409 }
2410
2411 slave->delay--;
2412 break;
2413 }
2414 }
2415
2416 return commit;
2417}
2418
2419static void bond_miimon_commit(struct bonding *bond)
2420{
2421 struct slave *slave;
2422 int i;
2423
2424 bond_for_each_slave(bond, slave, i) {
2425 switch (slave->new_link) {
2426 case BOND_LINK_NOCHANGE:
2427 continue;
2428
2429 case BOND_LINK_UP:
2430 slave->link = BOND_LINK_UP;
2431 slave->jiffies = jiffies;
2432
2433 if (bond->params.mode == BOND_MODE_8023AD) {
2434 /* prevent it from being the active one */
2435 bond_set_backup_slave(slave);
2436 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2437 /* make it immediately active */
2438 bond_set_active_slave(slave);
2439 } else if (slave != bond->primary_slave) {
2440 /* prevent it from being the active one */
2441 bond_set_backup_slave(slave);
2442 }
2443
2444 bond_update_speed_duplex(slave);
2445
2446 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2447 bond->dev->name, slave->dev->name,
2448 slave->speed, slave->duplex ? "full" : "half");
2449
2450 /* notify ad that the link status has changed */
2451 if (bond->params.mode == BOND_MODE_8023AD)
2452 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2453
2454 if (bond_is_lb(bond))
2455 bond_alb_handle_link_change(bond, slave,
2456 BOND_LINK_UP);
2457
2458 if (!bond->curr_active_slave ||
2459 (slave == bond->primary_slave))
2460 goto do_failover;
2461
2462 continue;
2463
2464 case BOND_LINK_DOWN:
2465 if (slave->link_failure_count < UINT_MAX)
2466 slave->link_failure_count++;
2467
2468 slave->link = BOND_LINK_DOWN;
2469
2470 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2471 bond->params.mode == BOND_MODE_8023AD)
2472 bond_set_slave_inactive_flags(slave);
2473
2474 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2475 bond->dev->name, slave->dev->name);
2476
2477 if (bond->params.mode == BOND_MODE_8023AD)
2478 bond_3ad_handle_link_change(slave,
2479 BOND_LINK_DOWN);
2480
2481 if (bond_is_lb(bond))
2482 bond_alb_handle_link_change(bond, slave,
2483 BOND_LINK_DOWN);
2484
2485 if (slave == bond->curr_active_slave)
2486 goto do_failover;
2487
2488 continue;
2489
2490 default:
2491 pr_err("%s: invalid new link %d on slave %s\n",
2492 bond->dev->name, slave->new_link,
2493 slave->dev->name);
2494 slave->new_link = BOND_LINK_NOCHANGE;
2495
2496 continue;
2497 }
2498
2499do_failover:
2500 ASSERT_RTNL();
2501 block_netpoll_tx();
2502 write_lock_bh(&bond->curr_slave_lock);
2503 bond_select_active_slave(bond);
2504 write_unlock_bh(&bond->curr_slave_lock);
2505 unblock_netpoll_tx();
2506 }
2507
2508 bond_set_carrier(bond);
2509}
2510
2511/*
2512 * bond_mii_monitor
2513 *
2514 * Really a wrapper that splits the mii monitor into two phases: an
2515 * inspection, then (if inspection indicates something needs to be done)
2516 * an acquisition of appropriate locks followed by a commit phase to
2517 * implement whatever link state changes are indicated.
2518 */
2519void bond_mii_monitor(struct work_struct *work)
2520{
2521 struct bonding *bond = container_of(work, struct bonding,
2522 mii_work.work);
2523 bool should_notify_peers = false;
2524
2525 read_lock(&bond->lock);
2526 if (bond->kill_timers)
2527 goto out;
2528
2529 if (bond->slave_cnt == 0)
2530 goto re_arm;
2531
2532 should_notify_peers = bond_should_notify_peers(bond);
2533
2534 if (bond_miimon_inspect(bond)) {
2535 read_unlock(&bond->lock);
2536 rtnl_lock();
2537 read_lock(&bond->lock);
2538
2539 bond_miimon_commit(bond);
2540
2541 read_unlock(&bond->lock);
2542 rtnl_unlock(); /* might sleep, hold no other locks */
2543 read_lock(&bond->lock);
2544 }
2545
2546re_arm:
2547 if (bond->params.miimon && !bond->kill_timers)
2548 queue_delayed_work(bond->wq, &bond->mii_work,
2549 msecs_to_jiffies(bond->params.miimon));
2550out:
2551 read_unlock(&bond->lock);
2552
2553 if (should_notify_peers) {
2554 rtnl_lock();
2555 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2556 rtnl_unlock();
2557 }
2558}
2559
2560static __be32 bond_glean_dev_ip(struct net_device *dev)
2561{
2562 struct in_device *idev;
2563 struct in_ifaddr *ifa;
2564 __be32 addr = 0;
2565
2566 if (!dev)
2567 return 0;
2568
2569 rcu_read_lock();
2570 idev = __in_dev_get_rcu(dev);
2571 if (!idev)
2572 goto out;
2573
2574 ifa = idev->ifa_list;
2575 if (!ifa)
2576 goto out;
2577
2578 addr = ifa->ifa_local;
2579out:
2580 rcu_read_unlock();
2581 return addr;
2582}
2583
2584static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2585{
2586 struct vlan_entry *vlan;
2587
2588 if (ip == bond->master_ip)
2589 return 1;
2590
2591 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2592 if (ip == vlan->vlan_ip)
2593 return 1;
2594 }
2595
2596 return 0;
2597}
2598
2599/*
2600 * We go to the (large) trouble of VLAN tagging ARP frames because
2601 * switches in VLAN mode (especially if ports are configured as
2602 * "native" to a VLAN) might not pass non-tagged frames.
2603 */
2604static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2605{
2606 struct sk_buff *skb;
2607
2608 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2609 slave_dev->name, dest_ip, src_ip, vlan_id);
2610
2611 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2612 NULL, slave_dev->dev_addr, NULL);
2613
2614 if (!skb) {
2615 pr_err("ARP packet allocation failed\n");
2616 return;
2617 }
2618 if (vlan_id) {
2619 skb = vlan_put_tag(skb, vlan_id);
2620 if (!skb) {
2621 pr_err("failed to insert VLAN tag\n");
2622 return;
2623 }
2624 }
2625 arp_xmit(skb);
2626}
2627
2628
2629static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2630{
2631 int i, vlan_id;
2632 __be32 *targets = bond->params.arp_targets;
2633 struct vlan_entry *vlan;
2634 struct net_device *vlan_dev;
2635 struct rtable *rt;
2636
2637 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2638 if (!targets[i])
2639 break;
2640 pr_debug("basa: target %x\n", targets[i]);
2641 if (!bond_vlan_used(bond)) {
2642 pr_debug("basa: empty vlan: arp_send\n");
2643 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2644 bond->master_ip, 0);
2645 continue;
2646 }
2647
2648 /*
2649 * If VLANs are configured, we do a route lookup to
2650 * determine which VLAN interface would be used, so we
2651 * can tag the ARP with the proper VLAN tag.
2652 */
2653 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2654 RTO_ONLINK, 0);
2655 if (IS_ERR(rt)) {
2656 if (net_ratelimit()) {
2657 pr_warning("%s: no route to arp_ip_target %pI4\n",
2658 bond->dev->name, &targets[i]);
2659 }
2660 continue;
2661 }
2662
2663 /*
2664 * This target is not on a VLAN
2665 */
2666 if (rt->dst.dev == bond->dev) {
2667 ip_rt_put(rt);
2668 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2669 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2670 bond->master_ip, 0);
2671 continue;
2672 }
2673
2674 vlan_id = 0;
2675 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2676 rcu_read_lock();
2677 vlan_dev = __vlan_find_dev_deep(bond->dev,
2678 vlan->vlan_id);
2679 rcu_read_unlock();
2680 if (vlan_dev == rt->dst.dev) {
2681 vlan_id = vlan->vlan_id;
2682 pr_debug("basa: vlan match on %s %d\n",
2683 vlan_dev->name, vlan_id);
2684 break;
2685 }
2686 }
2687
2688 if (vlan_id) {
2689 ip_rt_put(rt);
2690 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2691 vlan->vlan_ip, vlan_id);
2692 continue;
2693 }
2694
2695 if (net_ratelimit()) {
2696 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2697 bond->dev->name, &targets[i],
2698 rt->dst.dev ? rt->dst.dev->name : "NULL");
2699 }
2700 ip_rt_put(rt);
2701 }
2702}
2703
2704static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2705{
2706 int i;
2707 __be32 *targets = bond->params.arp_targets;
2708
2709 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2710 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2711 &sip, &tip, i, &targets[i],
2712 bond_has_this_ip(bond, tip));
2713 if (sip == targets[i]) {
2714 if (bond_has_this_ip(bond, tip))
2715 slave->last_arp_rx = jiffies;
2716 return;
2717 }
2718 }
2719}
2720
2721static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2722 struct slave *slave)
2723{
2724 struct arphdr *arp;
2725 unsigned char *arp_ptr;
2726 __be32 sip, tip;
2727
2728 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2729 return;
2730
2731 read_lock(&bond->lock);
2732
2733 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2734 bond->dev->name, skb->dev->name);
2735
2736 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2737 goto out_unlock;
2738
2739 arp = arp_hdr(skb);
2740 if (arp->ar_hln != bond->dev->addr_len ||
2741 skb->pkt_type == PACKET_OTHERHOST ||
2742 skb->pkt_type == PACKET_LOOPBACK ||
2743 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2744 arp->ar_pro != htons(ETH_P_IP) ||
2745 arp->ar_pln != 4)
2746 goto out_unlock;
2747
2748 arp_ptr = (unsigned char *)(arp + 1);
2749 arp_ptr += bond->dev->addr_len;
2750 memcpy(&sip, arp_ptr, 4);
2751 arp_ptr += 4 + bond->dev->addr_len;
2752 memcpy(&tip, arp_ptr, 4);
2753
2754 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2755 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2756 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2757 &sip, &tip);
2758
2759 /*
2760 * Backup slaves won't see the ARP reply, but do come through
2761 * here for each ARP probe (so we swap the sip/tip to validate
2762 * the probe). In a "redundant switch, common router" type of
2763 * configuration, the ARP probe will (hopefully) travel from
2764 * the active, through one switch, the router, then the other
2765 * switch before reaching the backup.
2766 */
2767 if (bond_is_active_slave(slave))
2768 bond_validate_arp(bond, slave, sip, tip);
2769 else
2770 bond_validate_arp(bond, slave, tip, sip);
2771
2772out_unlock:
2773 read_unlock(&bond->lock);
2774}
2775
2776/*
2777 * this function is called regularly to monitor each slave's link
2778 * ensuring that traffic is being sent and received when arp monitoring
2779 * is used in load-balancing mode. if the adapter has been dormant, then an
2780 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2781 * arp monitoring in active backup mode.
2782 */
2783void bond_loadbalance_arp_mon(struct work_struct *work)
2784{
2785 struct bonding *bond = container_of(work, struct bonding,
2786 arp_work.work);
2787 struct slave *slave, *oldcurrent;
2788 int do_failover = 0;
2789 int delta_in_ticks;
2790 int i;
2791
2792 read_lock(&bond->lock);
2793
2794 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2795
2796 if (bond->kill_timers)
2797 goto out;
2798
2799 if (bond->slave_cnt == 0)
2800 goto re_arm;
2801
2802 read_lock(&bond->curr_slave_lock);
2803 oldcurrent = bond->curr_active_slave;
2804 read_unlock(&bond->curr_slave_lock);
2805
2806 /* see if any of the previous devices are up now (i.e. they have
2807 * xmt and rcv traffic). the curr_active_slave does not come into
2808 * the picture unless it is null. also, slave->jiffies is not needed
2809 * here because we send an arp on each slave and give a slave as
2810 * long as it needs to get the tx/rx within the delta.
2811 * TODO: what about up/down delay in arp mode? it wasn't here before
2812 * so it can wait
2813 */
2814 bond_for_each_slave(bond, slave, i) {
2815 unsigned long trans_start = dev_trans_start(slave->dev);
2816
2817 if (slave->link != BOND_LINK_UP) {
2818 if (time_in_range(jiffies,
2819 trans_start - delta_in_ticks,
2820 trans_start + delta_in_ticks) &&
2821 time_in_range(jiffies,
2822 slave->dev->last_rx - delta_in_ticks,
2823 slave->dev->last_rx + delta_in_ticks)) {
2824
2825 slave->link = BOND_LINK_UP;
2826 bond_set_active_slave(slave);
2827
2828 /* primary_slave has no meaning in round-robin
2829 * mode. the window of a slave being up and
2830 * curr_active_slave being null after enslaving
2831 * is closed.
2832 */
2833 if (!oldcurrent) {
2834 pr_info("%s: link status definitely up for interface %s, ",
2835 bond->dev->name,
2836 slave->dev->name);
2837 do_failover = 1;
2838 } else {
2839 pr_info("%s: interface %s is now up\n",
2840 bond->dev->name,
2841 slave->dev->name);
2842 }
2843 }
2844 } else {
2845 /* slave->link == BOND_LINK_UP */
2846
2847 /* not all switches will respond to an arp request
2848 * when the source ip is 0, so don't take the link down
2849 * if we don't know our ip yet
2850 */
2851 if (!time_in_range(jiffies,
2852 trans_start - delta_in_ticks,
2853 trans_start + 2 * delta_in_ticks) ||
2854 !time_in_range(jiffies,
2855 slave->dev->last_rx - delta_in_ticks,
2856 slave->dev->last_rx + 2 * delta_in_ticks)) {
2857
2858 slave->link = BOND_LINK_DOWN;
2859 bond_set_backup_slave(slave);
2860
2861 if (slave->link_failure_count < UINT_MAX)
2862 slave->link_failure_count++;
2863
2864 pr_info("%s: interface %s is now down.\n",
2865 bond->dev->name,
2866 slave->dev->name);
2867
2868 if (slave == oldcurrent)
2869 do_failover = 1;
2870 }
2871 }
2872
2873 /* note: if switch is in round-robin mode, all links
2874 * must tx arp to ensure all links rx an arp - otherwise
2875 * links may oscillate or not come up at all; if switch is
2876 * in something like xor mode, there is nothing we can
2877 * do - all replies will be rx'ed on same link causing slaves
2878 * to be unstable during low/no traffic periods
2879 */
2880 if (IS_UP(slave->dev))
2881 bond_arp_send_all(bond, slave);
2882 }
2883
2884 if (do_failover) {
2885 block_netpoll_tx();
2886 write_lock_bh(&bond->curr_slave_lock);
2887
2888 bond_select_active_slave(bond);
2889
2890 write_unlock_bh(&bond->curr_slave_lock);
2891 unblock_netpoll_tx();
2892 }
2893
2894re_arm:
2895 if (bond->params.arp_interval && !bond->kill_timers)
2896 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2897out:
2898 read_unlock(&bond->lock);
2899}
2900
2901/*
2902 * Called to inspect slaves for active-backup mode ARP monitor link state
2903 * changes. Sets new_link in slaves to specify what action should take
2904 * place for the slave. Returns 0 if no changes are found, >0 if changes
2905 * to link states must be committed.
2906 *
2907 * Called with bond->lock held for read.
2908 */
2909static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2910{
2911 struct slave *slave;
2912 int i, commit = 0;
2913 unsigned long trans_start;
2914
2915 bond_for_each_slave(bond, slave, i) {
2916 slave->new_link = BOND_LINK_NOCHANGE;
2917
2918 if (slave->link != BOND_LINK_UP) {
2919 if (time_in_range(jiffies,
2920 slave_last_rx(bond, slave) - delta_in_ticks,
2921 slave_last_rx(bond, slave) + delta_in_ticks)) {
2922
2923 slave->new_link = BOND_LINK_UP;
2924 commit++;
2925 }
2926
2927 continue;
2928 }
2929
2930 /*
2931 * Give slaves 2*delta after being enslaved or made
2932 * active. This avoids bouncing, as the last receive
2933 * times need a full ARP monitor cycle to be updated.
2934 */
2935 if (time_in_range(jiffies,
2936 slave->jiffies - delta_in_ticks,
2937 slave->jiffies + 2 * delta_in_ticks))
2938 continue;
2939
2940 /*
2941 * Backup slave is down if:
2942 * - No current_arp_slave AND
2943 * - more than 3*delta since last receive AND
2944 * - the bond has an IP address
2945 *
2946 * Note: a non-null current_arp_slave indicates
2947 * the curr_active_slave went down and we are
2948 * searching for a new one; under this condition
2949 * we only take the curr_active_slave down - this
2950 * gives each slave a chance to tx/rx traffic
2951 * before being taken out
2952 */
2953 if (!bond_is_active_slave(slave) &&
2954 !bond->current_arp_slave &&
2955 !time_in_range(jiffies,
2956 slave_last_rx(bond, slave) - delta_in_ticks,
2957 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2958
2959 slave->new_link = BOND_LINK_DOWN;
2960 commit++;
2961 }
2962
2963 /*
2964 * Active slave is down if:
2965 * - more than 2*delta since transmitting OR
2966 * - (more than 2*delta since receive AND
2967 * the bond has an IP address)
2968 */
2969 trans_start = dev_trans_start(slave->dev);
2970 if (bond_is_active_slave(slave) &&
2971 (!time_in_range(jiffies,
2972 trans_start - delta_in_ticks,
2973 trans_start + 2 * delta_in_ticks) ||
2974 !time_in_range(jiffies,
2975 slave_last_rx(bond, slave) - delta_in_ticks,
2976 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2977
2978 slave->new_link = BOND_LINK_DOWN;
2979 commit++;
2980 }
2981 }
2982
2983 return commit;
2984}
2985
2986/*
2987 * Called to commit link state changes noted by inspection step of
2988 * active-backup mode ARP monitor.
2989 *
2990 * Called with RTNL and bond->lock for read.
2991 */
2992static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2993{
2994 struct slave *slave;
2995 int i;
2996 unsigned long trans_start;
2997
2998 bond_for_each_slave(bond, slave, i) {
2999 switch (slave->new_link) {
3000 case BOND_LINK_NOCHANGE:
3001 continue;
3002
3003 case BOND_LINK_UP:
3004 trans_start = dev_trans_start(slave->dev);
3005 if ((!bond->curr_active_slave &&
3006 time_in_range(jiffies,
3007 trans_start - delta_in_ticks,
3008 trans_start + delta_in_ticks)) ||
3009 bond->curr_active_slave != slave) {
3010 slave->link = BOND_LINK_UP;
3011 bond->current_arp_slave = NULL;
3012
3013 pr_info("%s: link status definitely up for interface %s.\n",
3014 bond->dev->name, slave->dev->name);
3015
3016 if (!bond->curr_active_slave ||
3017 (slave == bond->primary_slave))
3018 goto do_failover;
3019
3020 }
3021
3022 continue;
3023
3024 case BOND_LINK_DOWN:
3025 if (slave->link_failure_count < UINT_MAX)
3026 slave->link_failure_count++;
3027
3028 slave->link = BOND_LINK_DOWN;
3029 bond_set_slave_inactive_flags(slave);
3030
3031 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3032 bond->dev->name, slave->dev->name);
3033
3034 if (slave == bond->curr_active_slave) {
3035 bond->current_arp_slave = NULL;
3036 goto do_failover;
3037 }
3038
3039 continue;
3040
3041 default:
3042 pr_err("%s: impossible: new_link %d on slave %s\n",
3043 bond->dev->name, slave->new_link,
3044 slave->dev->name);
3045 continue;
3046 }
3047
3048do_failover:
3049 ASSERT_RTNL();
3050 block_netpoll_tx();
3051 write_lock_bh(&bond->curr_slave_lock);
3052 bond_select_active_slave(bond);
3053 write_unlock_bh(&bond->curr_slave_lock);
3054 unblock_netpoll_tx();
3055 }
3056
3057 bond_set_carrier(bond);
3058}
3059
3060/*
3061 * Send ARP probes for active-backup mode ARP monitor.
3062 *
3063 * Called with bond->lock held for read.
3064 */
3065static void bond_ab_arp_probe(struct bonding *bond)
3066{
3067 struct slave *slave;
3068 int i;
3069
3070 read_lock(&bond->curr_slave_lock);
3071
3072 if (bond->current_arp_slave && bond->curr_active_slave)
3073 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3074 bond->current_arp_slave->dev->name,
3075 bond->curr_active_slave->dev->name);
3076
3077 if (bond->curr_active_slave) {
3078 bond_arp_send_all(bond, bond->curr_active_slave);
3079 read_unlock(&bond->curr_slave_lock);
3080 return;
3081 }
3082
3083 read_unlock(&bond->curr_slave_lock);
3084
3085 /* if we don't have a curr_active_slave, search for the next available
3086 * backup slave from the current_arp_slave and make it the candidate
3087 * for becoming the curr_active_slave
3088 */
3089
3090 if (!bond->current_arp_slave) {
3091 bond->current_arp_slave = bond->first_slave;
3092 if (!bond->current_arp_slave)
3093 return;
3094 }
3095
3096 bond_set_slave_inactive_flags(bond->current_arp_slave);
3097
3098 /* search for next candidate */
3099 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3100 if (IS_UP(slave->dev)) {
3101 slave->link = BOND_LINK_BACK;
3102 bond_set_slave_active_flags(slave);
3103 bond_arp_send_all(bond, slave);
3104 slave->jiffies = jiffies;
3105 bond->current_arp_slave = slave;
3106 break;
3107 }
3108
3109 /* if the link state is up at this point, we
3110 * mark it down - this can happen if we have
3111 * simultaneous link failures and
3112 * reselect_active_interface doesn't make this
3113 * one the current slave so it is still marked
3114 * up when it is actually down
3115 */
3116 if (slave->link == BOND_LINK_UP) {
3117 slave->link = BOND_LINK_DOWN;
3118 if (slave->link_failure_count < UINT_MAX)
3119 slave->link_failure_count++;
3120
3121 bond_set_slave_inactive_flags(slave);
3122
3123 pr_info("%s: backup interface %s is now down.\n",
3124 bond->dev->name, slave->dev->name);
3125 }
3126 }
3127}
3128
3129void bond_activebackup_arp_mon(struct work_struct *work)
3130{
3131 struct bonding *bond = container_of(work, struct bonding,
3132 arp_work.work);
3133 bool should_notify_peers = false;
3134 int delta_in_ticks;
3135
3136 read_lock(&bond->lock);
3137
3138 if (bond->kill_timers)
3139 goto out;
3140
3141 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3142
3143 if (bond->slave_cnt == 0)
3144 goto re_arm;
3145
3146 should_notify_peers = bond_should_notify_peers(bond);
3147
3148 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3149 read_unlock(&bond->lock);
3150 rtnl_lock();
3151 read_lock(&bond->lock);
3152
3153 bond_ab_arp_commit(bond, delta_in_ticks);
3154
3155 read_unlock(&bond->lock);
3156 rtnl_unlock();
3157 read_lock(&bond->lock);
3158 }
3159
3160 bond_ab_arp_probe(bond);
3161
3162re_arm:
3163 if (bond->params.arp_interval && !bond->kill_timers)
3164 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3165out:
3166 read_unlock(&bond->lock);
3167
3168 if (should_notify_peers) {
3169 rtnl_lock();
3170 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3171 rtnl_unlock();
3172 }
3173}
3174
3175/*-------------------------- netdev event handling --------------------------*/
3176
3177/*
3178 * Change device name
3179 */
3180static int bond_event_changename(struct bonding *bond)
3181{
3182 bond_remove_proc_entry(bond);
3183 bond_create_proc_entry(bond);
3184
3185 bond_debug_reregister(bond);
3186
3187 return NOTIFY_DONE;
3188}
3189
3190static int bond_master_netdev_event(unsigned long event,
3191 struct net_device *bond_dev)
3192{
3193 struct bonding *event_bond = netdev_priv(bond_dev);
3194
3195 switch (event) {
3196 case NETDEV_CHANGENAME:
3197 return bond_event_changename(event_bond);
3198 default:
3199 break;
3200 }
3201
3202 return NOTIFY_DONE;
3203}
3204
3205static int bond_slave_netdev_event(unsigned long event,
3206 struct net_device *slave_dev)
3207{
3208 struct net_device *bond_dev = slave_dev->master;
3209 struct bonding *bond = netdev_priv(bond_dev);
3210
3211 switch (event) {
3212 case NETDEV_UNREGISTER:
3213 if (bond_dev) {
3214 if (bond->setup_by_slave)
3215 bond_release_and_destroy(bond_dev, slave_dev);
3216 else
3217 bond_release(bond_dev, slave_dev);
3218 }
3219 break;
3220 case NETDEV_CHANGE:
3221 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3222 struct slave *slave;
3223
3224 slave = bond_get_slave_by_dev(bond, slave_dev);
3225 if (slave) {
3226 u32 old_speed = slave->speed;
3227 u8 old_duplex = slave->duplex;
3228
3229 bond_update_speed_duplex(slave);
3230
3231 if (bond_is_lb(bond))
3232 break;
3233
3234 if (old_speed != slave->speed)
3235 bond_3ad_adapter_speed_changed(slave);
3236 if (old_duplex != slave->duplex)
3237 bond_3ad_adapter_duplex_changed(slave);
3238 }
3239 }
3240
3241 break;
3242 case NETDEV_DOWN:
3243 /*
3244 * ... Or is it this?
3245 */
3246 break;
3247 case NETDEV_CHANGEMTU:
3248 /*
3249 * TODO: Should slaves be allowed to
3250 * independently alter their MTU? For
3251 * an active-backup bond, slaves need
3252 * not be the same type of device, so
3253 * MTUs may vary. For other modes,
3254 * slaves arguably should have the
3255 * same MTUs. To do this, we'd need to
3256 * take over the slave's change_mtu
3257 * function for the duration of their
3258 * servitude.
3259 */
3260 break;
3261 case NETDEV_CHANGENAME:
3262 /*
3263 * TODO: handle changing the primary's name
3264 */
3265 break;
3266 case NETDEV_FEAT_CHANGE:
3267 bond_compute_features(bond);
3268 break;
3269 default:
3270 break;
3271 }
3272
3273 return NOTIFY_DONE;
3274}
3275
3276/*
3277 * bond_netdev_event: handle netdev notifier chain events.
3278 *
3279 * This function receives events for the netdev chain. The caller (an
3280 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3281 * locks for us to safely manipulate the slave devices (RTNL lock,
3282 * dev_probe_lock).
3283 */
3284static int bond_netdev_event(struct notifier_block *this,
3285 unsigned long event, void *ptr)
3286{
3287 struct net_device *event_dev = (struct net_device *)ptr;
3288
3289 pr_debug("event_dev: %s, event: %lx\n",
3290 event_dev ? event_dev->name : "None",
3291 event);
3292
3293 if (!(event_dev->priv_flags & IFF_BONDING))
3294 return NOTIFY_DONE;
3295
3296 if (event_dev->flags & IFF_MASTER) {
3297 pr_debug("IFF_MASTER\n");
3298 return bond_master_netdev_event(event, event_dev);
3299 }
3300
3301 if (event_dev->flags & IFF_SLAVE) {
3302 pr_debug("IFF_SLAVE\n");
3303 return bond_slave_netdev_event(event, event_dev);
3304 }
3305
3306 return NOTIFY_DONE;
3307}
3308
3309/*
3310 * bond_inetaddr_event: handle inetaddr notifier chain events.
3311 *
3312 * We keep track of device IPs primarily to use as source addresses in
3313 * ARP monitor probes (rather than spewing out broadcasts all the time).
3314 *
3315 * We track one IP for the main device (if it has one), plus one per VLAN.
3316 */
3317static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3318{
3319 struct in_ifaddr *ifa = ptr;
3320 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3321 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3322 struct bonding *bond;
3323 struct vlan_entry *vlan;
3324
3325 list_for_each_entry(bond, &bn->dev_list, bond_list) {
3326 if (bond->dev == event_dev) {
3327 switch (event) {
3328 case NETDEV_UP:
3329 bond->master_ip = ifa->ifa_local;
3330 return NOTIFY_OK;
3331 case NETDEV_DOWN:
3332 bond->master_ip = bond_glean_dev_ip(bond->dev);
3333 return NOTIFY_OK;
3334 default:
3335 return NOTIFY_DONE;
3336 }
3337 }
3338
3339 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3340 vlan_dev = __vlan_find_dev_deep(bond->dev,
3341 vlan->vlan_id);
3342 if (vlan_dev == event_dev) {
3343 switch (event) {
3344 case NETDEV_UP:
3345 vlan->vlan_ip = ifa->ifa_local;
3346 return NOTIFY_OK;
3347 case NETDEV_DOWN:
3348 vlan->vlan_ip =
3349 bond_glean_dev_ip(vlan_dev);
3350 return NOTIFY_OK;
3351 default:
3352 return NOTIFY_DONE;
3353 }
3354 }
3355 }
3356 }
3357 return NOTIFY_DONE;
3358}
3359
3360static struct notifier_block bond_netdev_notifier = {
3361 .notifier_call = bond_netdev_event,
3362};
3363
3364static struct notifier_block bond_inetaddr_notifier = {
3365 .notifier_call = bond_inetaddr_event,
3366};
3367
3368/*---------------------------- Hashing Policies -----------------------------*/
3369
3370/*
3371 * Hash for the output device based upon layer 2 and layer 3 data. If
3372 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3373 */
3374static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3375{
3376 struct ethhdr *data = (struct ethhdr *)skb->data;
3377 struct iphdr *iph = ip_hdr(skb);
3378
3379 if (skb->protocol == htons(ETH_P_IP)) {
3380 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3381 (data->h_dest[5] ^ data->h_source[5])) % count;
3382 }
3383
3384 return (data->h_dest[5] ^ data->h_source[5]) % count;
3385}
3386
3387/*
3388 * Hash for the output device based upon layer 3 and layer 4 data. If
3389 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3390 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3391 */
3392static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3393{
3394 struct ethhdr *data = (struct ethhdr *)skb->data;
3395 struct iphdr *iph = ip_hdr(skb);
3396 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3397 int layer4_xor = 0;
3398
3399 if (skb->protocol == htons(ETH_P_IP)) {
3400 if (!ip_is_fragment(iph) &&
3401 (iph->protocol == IPPROTO_TCP ||
3402 iph->protocol == IPPROTO_UDP)) {
3403 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3404 }
3405 return (layer4_xor ^
3406 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3407
3408 }
3409
3410 return (data->h_dest[5] ^ data->h_source[5]) % count;
3411}
3412
3413/*
3414 * Hash for the output device based upon layer 2 data
3415 */
3416static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3417{
3418 struct ethhdr *data = (struct ethhdr *)skb->data;
3419
3420 return (data->h_dest[5] ^ data->h_source[5]) % count;
3421}
3422
3423/*-------------------------- Device entry points ----------------------------*/
3424
3425static int bond_open(struct net_device *bond_dev)
3426{
3427 struct bonding *bond = netdev_priv(bond_dev);
3428 struct slave *slave;
3429 int i;
3430
3431 bond->kill_timers = 0;
3432
3433 /* reset slave->backup and slave->inactive */
3434 read_lock(&bond->lock);
3435 if (bond->slave_cnt > 0) {
3436 read_lock(&bond->curr_slave_lock);
3437 bond_for_each_slave(bond, slave, i) {
3438 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3439 && (slave != bond->curr_active_slave)) {
3440 bond_set_slave_inactive_flags(slave);
3441 } else {
3442 bond_set_slave_active_flags(slave);
3443 }
3444 }
3445 read_unlock(&bond->curr_slave_lock);
3446 }
3447 read_unlock(&bond->lock);
3448
3449 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3450
3451 if (bond_is_lb(bond)) {
3452 /* bond_alb_initialize must be called before the timer
3453 * is started.
3454 */
3455 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3456 /* something went wrong - fail the open operation */
3457 return -ENOMEM;
3458 }
3459
3460 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3461 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3462 }
3463
3464 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3465 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3466 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3467 }
3468
3469 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3470 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3471 INIT_DELAYED_WORK(&bond->arp_work,
3472 bond_activebackup_arp_mon);
3473 else
3474 INIT_DELAYED_WORK(&bond->arp_work,
3475 bond_loadbalance_arp_mon);
3476
3477 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3478 if (bond->params.arp_validate)
3479 bond->recv_probe = bond_arp_rcv;
3480 }
3481
3482 if (bond->params.mode == BOND_MODE_8023AD) {
3483 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3484 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3485 /* register to receive LACPDUs */
3486 bond->recv_probe = bond_3ad_lacpdu_recv;
3487 bond_3ad_initiate_agg_selection(bond, 1);
3488 }
3489
3490 return 0;
3491}
3492
3493static int bond_close(struct net_device *bond_dev)
3494{
3495 struct bonding *bond = netdev_priv(bond_dev);
3496
3497 write_lock_bh(&bond->lock);
3498
3499 bond->send_peer_notif = 0;
3500
3501 /* signal timers not to re-arm */
3502 bond->kill_timers = 1;
3503
3504 write_unlock_bh(&bond->lock);
3505
3506 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3507 cancel_delayed_work(&bond->mii_work);
3508 }
3509
3510 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3511 cancel_delayed_work(&bond->arp_work);
3512 }
3513
3514 switch (bond->params.mode) {
3515 case BOND_MODE_8023AD:
3516 cancel_delayed_work(&bond->ad_work);
3517 break;
3518 case BOND_MODE_TLB:
3519 case BOND_MODE_ALB:
3520 cancel_delayed_work(&bond->alb_work);
3521 break;
3522 default:
3523 break;
3524 }
3525
3526 if (delayed_work_pending(&bond->mcast_work))
3527 cancel_delayed_work(&bond->mcast_work);
3528
3529 if (bond_is_lb(bond)) {
3530 /* Must be called only after all
3531 * slaves have been released
3532 */
3533 bond_alb_deinitialize(bond);
3534 }
3535 bond->recv_probe = NULL;
3536
3537 return 0;
3538}
3539
3540static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3541 struct rtnl_link_stats64 *stats)
3542{
3543 struct bonding *bond = netdev_priv(bond_dev);
3544 struct rtnl_link_stats64 temp;
3545 struct slave *slave;
3546 int i;
3547
3548 memset(stats, 0, sizeof(*stats));
3549
3550 read_lock_bh(&bond->lock);
3551
3552 bond_for_each_slave(bond, slave, i) {
3553 const struct rtnl_link_stats64 *sstats =
3554 dev_get_stats(slave->dev, &temp);
3555
3556 stats->rx_packets += sstats->rx_packets;
3557 stats->rx_bytes += sstats->rx_bytes;
3558 stats->rx_errors += sstats->rx_errors;
3559 stats->rx_dropped += sstats->rx_dropped;
3560
3561 stats->tx_packets += sstats->tx_packets;
3562 stats->tx_bytes += sstats->tx_bytes;
3563 stats->tx_errors += sstats->tx_errors;
3564 stats->tx_dropped += sstats->tx_dropped;
3565
3566 stats->multicast += sstats->multicast;
3567 stats->collisions += sstats->collisions;
3568
3569 stats->rx_length_errors += sstats->rx_length_errors;
3570 stats->rx_over_errors += sstats->rx_over_errors;
3571 stats->rx_crc_errors += sstats->rx_crc_errors;
3572 stats->rx_frame_errors += sstats->rx_frame_errors;
3573 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3574 stats->rx_missed_errors += sstats->rx_missed_errors;
3575
3576 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3577 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3578 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3579 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3580 stats->tx_window_errors += sstats->tx_window_errors;
3581 }
3582
3583 read_unlock_bh(&bond->lock);
3584
3585 return stats;
3586}
3587
3588static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3589{
3590 struct net_device *slave_dev = NULL;
3591 struct ifbond k_binfo;
3592 struct ifbond __user *u_binfo = NULL;
3593 struct ifslave k_sinfo;
3594 struct ifslave __user *u_sinfo = NULL;
3595 struct mii_ioctl_data *mii = NULL;
3596 int res = 0;
3597
3598 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3599
3600 switch (cmd) {
3601 case SIOCGMIIPHY:
3602 mii = if_mii(ifr);
3603 if (!mii)
3604 return -EINVAL;
3605
3606 mii->phy_id = 0;
3607 /* Fall Through */
3608 case SIOCGMIIREG:
3609 /*
3610 * We do this again just in case we were called by SIOCGMIIREG
3611 * instead of SIOCGMIIPHY.
3612 */
3613 mii = if_mii(ifr);
3614 if (!mii)
3615 return -EINVAL;
3616
3617
3618 if (mii->reg_num == 1) {
3619 struct bonding *bond = netdev_priv(bond_dev);
3620 mii->val_out = 0;
3621 read_lock(&bond->lock);
3622 read_lock(&bond->curr_slave_lock);
3623 if (netif_carrier_ok(bond->dev))
3624 mii->val_out = BMSR_LSTATUS;
3625
3626 read_unlock(&bond->curr_slave_lock);
3627 read_unlock(&bond->lock);
3628 }
3629
3630 return 0;
3631 case BOND_INFO_QUERY_OLD:
3632 case SIOCBONDINFOQUERY:
3633 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3634
3635 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3636 return -EFAULT;
3637
3638 res = bond_info_query(bond_dev, &k_binfo);
3639 if (res == 0 &&
3640 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3641 return -EFAULT;
3642
3643 return res;
3644 case BOND_SLAVE_INFO_QUERY_OLD:
3645 case SIOCBONDSLAVEINFOQUERY:
3646 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3647
3648 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3649 return -EFAULT;
3650
3651 res = bond_slave_info_query(bond_dev, &k_sinfo);
3652 if (res == 0 &&
3653 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3654 return -EFAULT;
3655
3656 return res;
3657 default:
3658 /* Go on */
3659 break;
3660 }
3661
3662 if (!capable(CAP_NET_ADMIN))
3663 return -EPERM;
3664
3665 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3666
3667 pr_debug("slave_dev=%p:\n", slave_dev);
3668
3669 if (!slave_dev)
3670 res = -ENODEV;
3671 else {
3672 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3673 switch (cmd) {
3674 case BOND_ENSLAVE_OLD:
3675 case SIOCBONDENSLAVE:
3676 res = bond_enslave(bond_dev, slave_dev);
3677 break;
3678 case BOND_RELEASE_OLD:
3679 case SIOCBONDRELEASE:
3680 res = bond_release(bond_dev, slave_dev);
3681 break;
3682 case BOND_SETHWADDR_OLD:
3683 case SIOCBONDSETHWADDR:
3684 res = bond_sethwaddr(bond_dev, slave_dev);
3685 break;
3686 case BOND_CHANGE_ACTIVE_OLD:
3687 case SIOCBONDCHANGEACTIVE:
3688 res = bond_ioctl_change_active(bond_dev, slave_dev);
3689 break;
3690 default:
3691 res = -EOPNOTSUPP;
3692 }
3693
3694 dev_put(slave_dev);
3695 }
3696
3697 return res;
3698}
3699
3700static bool bond_addr_in_mc_list(unsigned char *addr,
3701 struct netdev_hw_addr_list *list,
3702 int addrlen)
3703{
3704 struct netdev_hw_addr *ha;
3705
3706 netdev_hw_addr_list_for_each(ha, list)
3707 if (!memcmp(ha->addr, addr, addrlen))
3708 return true;
3709
3710 return false;
3711}
3712
3713static void bond_set_multicast_list(struct net_device *bond_dev)
3714{
3715 struct bonding *bond = netdev_priv(bond_dev);
3716 struct netdev_hw_addr *ha;
3717 bool found;
3718
3719 /*
3720 * Do promisc before checking multicast_mode
3721 */
3722 if ((bond_dev->flags & IFF_PROMISC) && !(bond->flags & IFF_PROMISC))
3723 /*
3724 * FIXME: Need to handle the error when one of the multi-slaves
3725 * encounters error.
3726 */
3727 bond_set_promiscuity(bond, 1);
3728
3729
3730 if (!(bond_dev->flags & IFF_PROMISC) && (bond->flags & IFF_PROMISC))
3731 bond_set_promiscuity(bond, -1);
3732
3733
3734 /* set allmulti flag to slaves */
3735 if ((bond_dev->flags & IFF_ALLMULTI) && !(bond->flags & IFF_ALLMULTI))
3736 /*
3737 * FIXME: Need to handle the error when one of the multi-slaves
3738 * encounters error.
3739 */
3740 bond_set_allmulti(bond, 1);
3741
3742
3743 if (!(bond_dev->flags & IFF_ALLMULTI) && (bond->flags & IFF_ALLMULTI))
3744 bond_set_allmulti(bond, -1);
3745
3746
3747 read_lock(&bond->lock);
3748
3749 bond->flags = bond_dev->flags;
3750
3751 /* looking for addresses to add to slaves' mc list */
3752 netdev_for_each_mc_addr(ha, bond_dev) {
3753 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3754 bond_dev->addr_len);
3755 if (!found)
3756 bond_mc_add(bond, ha->addr);
3757 }
3758
3759 /* looking for addresses to delete from slaves' list */
3760 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3761 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3762 bond_dev->addr_len);
3763 if (!found)
3764 bond_mc_del(bond, ha->addr);
3765 }
3766
3767 /* save master's multicast list */
3768 __hw_addr_flush(&bond->mc_list);
3769 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3770 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3771
3772 read_unlock(&bond->lock);
3773}
3774
3775static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3776{
3777 struct bonding *bond = netdev_priv(dev);
3778 struct slave *slave = bond->first_slave;
3779
3780 if (slave) {
3781 const struct net_device_ops *slave_ops
3782 = slave->dev->netdev_ops;
3783 if (slave_ops->ndo_neigh_setup)
3784 return slave_ops->ndo_neigh_setup(slave->dev, parms);
3785 }
3786 return 0;
3787}
3788
3789/*
3790 * Change the MTU of all of a master's slaves to match the master
3791 */
3792static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3793{
3794 struct bonding *bond = netdev_priv(bond_dev);
3795 struct slave *slave, *stop_at;
3796 int res = 0;
3797 int i;
3798
3799 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3800 (bond_dev ? bond_dev->name : "None"), new_mtu);
3801
3802 /* Can't hold bond->lock with bh disabled here since
3803 * some base drivers panic. On the other hand we can't
3804 * hold bond->lock without bh disabled because we'll
3805 * deadlock. The only solution is to rely on the fact
3806 * that we're under rtnl_lock here, and the slaves
3807 * list won't change. This doesn't solve the problem
3808 * of setting the slave's MTU while it is
3809 * transmitting, but the assumption is that the base
3810 * driver can handle that.
3811 *
3812 * TODO: figure out a way to safely iterate the slaves
3813 * list, but without holding a lock around the actual
3814 * call to the base driver.
3815 */
3816
3817 bond_for_each_slave(bond, slave, i) {
3818 pr_debug("s %p s->p %p c_m %p\n",
3819 slave,
3820 slave->prev,
3821 slave->dev->netdev_ops->ndo_change_mtu);
3822
3823 res = dev_set_mtu(slave->dev, new_mtu);
3824
3825 if (res) {
3826 /* If we failed to set the slave's mtu to the new value
3827 * we must abort the operation even in ACTIVE_BACKUP
3828 * mode, because if we allow the backup slaves to have
3829 * different mtu values than the active slave we'll
3830 * need to change their mtu when doing a failover. That
3831 * means changing their mtu from timer context, which
3832 * is probably not a good idea.
3833 */
3834 pr_debug("err %d %s\n", res, slave->dev->name);
3835 goto unwind;
3836 }
3837 }
3838
3839 bond_dev->mtu = new_mtu;
3840
3841 return 0;
3842
3843unwind:
3844 /* unwind from head to the slave that failed */
3845 stop_at = slave;
3846 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3847 int tmp_res;
3848
3849 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3850 if (tmp_res) {
3851 pr_debug("unwind err %d dev %s\n",
3852 tmp_res, slave->dev->name);
3853 }
3854 }
3855
3856 return res;
3857}
3858
3859/*
3860 * Change HW address
3861 *
3862 * Note that many devices must be down to change the HW address, and
3863 * downing the master releases all slaves. We can make bonds full of
3864 * bonding devices to test this, however.
3865 */
3866static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3867{
3868 struct bonding *bond = netdev_priv(bond_dev);
3869 struct sockaddr *sa = addr, tmp_sa;
3870 struct slave *slave, *stop_at;
3871 int res = 0;
3872 int i;
3873
3874 if (bond->params.mode == BOND_MODE_ALB)
3875 return bond_alb_set_mac_address(bond_dev, addr);
3876
3877
3878 pr_debug("bond=%p, name=%s\n",
3879 bond, bond_dev ? bond_dev->name : "None");
3880
3881 /*
3882 * If fail_over_mac is set to active, do nothing and return
3883 * success. Returning an error causes ifenslave to fail.
3884 */
3885 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3886 return 0;
3887
3888 if (!is_valid_ether_addr(sa->sa_data))
3889 return -EADDRNOTAVAIL;
3890
3891 /* Can't hold bond->lock with bh disabled here since
3892 * some base drivers panic. On the other hand we can't
3893 * hold bond->lock without bh disabled because we'll
3894 * deadlock. The only solution is to rely on the fact
3895 * that we're under rtnl_lock here, and the slaves
3896 * list won't change. This doesn't solve the problem
3897 * of setting the slave's hw address while it is
3898 * transmitting, but the assumption is that the base
3899 * driver can handle that.
3900 *
3901 * TODO: figure out a way to safely iterate the slaves
3902 * list, but without holding a lock around the actual
3903 * call to the base driver.
3904 */
3905
3906 bond_for_each_slave(bond, slave, i) {
3907 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3908 pr_debug("slave %p %s\n", slave, slave->dev->name);
3909
3910 if (slave_ops->ndo_set_mac_address == NULL) {
3911 res = -EOPNOTSUPP;
3912 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3913 goto unwind;
3914 }
3915
3916 res = dev_set_mac_address(slave->dev, addr);
3917 if (res) {
3918 /* TODO: consider downing the slave
3919 * and retry ?
3920 * User should expect communications
3921 * breakage anyway until ARP finish
3922 * updating, so...
3923 */
3924 pr_debug("err %d %s\n", res, slave->dev->name);
3925 goto unwind;
3926 }
3927 }
3928
3929 /* success */
3930 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3931 return 0;
3932
3933unwind:
3934 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3935 tmp_sa.sa_family = bond_dev->type;
3936
3937 /* unwind from head to the slave that failed */
3938 stop_at = slave;
3939 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3940 int tmp_res;
3941
3942 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3943 if (tmp_res) {
3944 pr_debug("unwind err %d dev %s\n",
3945 tmp_res, slave->dev->name);
3946 }
3947 }
3948
3949 return res;
3950}
3951
3952static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3953{
3954 struct bonding *bond = netdev_priv(bond_dev);
3955 struct slave *slave, *start_at;
3956 int i, slave_no, res = 1;
3957 struct iphdr *iph = ip_hdr(skb);
3958
3959 /*
3960 * Start with the curr_active_slave that joined the bond as the
3961 * default for sending IGMP traffic. For failover purposes one
3962 * needs to maintain some consistency for the interface that will
3963 * send the join/membership reports. The curr_active_slave found
3964 * will send all of this type of traffic.
3965 */
3966 if ((iph->protocol == IPPROTO_IGMP) &&
3967 (skb->protocol == htons(ETH_P_IP))) {
3968
3969 read_lock(&bond->curr_slave_lock);
3970 slave = bond->curr_active_slave;
3971 read_unlock(&bond->curr_slave_lock);
3972
3973 if (!slave)
3974 goto out;
3975 } else {
3976 /*
3977 * Concurrent TX may collide on rr_tx_counter; we accept
3978 * that as being rare enough not to justify using an
3979 * atomic op here.
3980 */
3981 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3982
3983 bond_for_each_slave(bond, slave, i) {
3984 slave_no--;
3985 if (slave_no < 0)
3986 break;
3987 }
3988 }
3989
3990 start_at = slave;
3991 bond_for_each_slave_from(bond, slave, i, start_at) {
3992 if (IS_UP(slave->dev) &&
3993 (slave->link == BOND_LINK_UP) &&
3994 bond_is_active_slave(slave)) {
3995 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3996 break;
3997 }
3998 }
3999
4000out:
4001 if (res) {
4002 /* no suitable interface, frame not sent */
4003 dev_kfree_skb(skb);
4004 }
4005
4006 return NETDEV_TX_OK;
4007}
4008
4009
4010/*
4011 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4012 * the bond has a usable interface.
4013 */
4014static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4015{
4016 struct bonding *bond = netdev_priv(bond_dev);
4017 int res = 1;
4018
4019 read_lock(&bond->curr_slave_lock);
4020
4021 if (bond->curr_active_slave)
4022 res = bond_dev_queue_xmit(bond, skb,
4023 bond->curr_active_slave->dev);
4024
4025 if (res)
4026 /* no suitable interface, frame not sent */
4027 dev_kfree_skb(skb);
4028
4029 read_unlock(&bond->curr_slave_lock);
4030
4031 return NETDEV_TX_OK;
4032}
4033
4034/*
4035 * In bond_xmit_xor() , we determine the output device by using a pre-
4036 * determined xmit_hash_policy(), If the selected device is not enabled,
4037 * find the next active slave.
4038 */
4039static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4040{
4041 struct bonding *bond = netdev_priv(bond_dev);
4042 struct slave *slave, *start_at;
4043 int slave_no;
4044 int i;
4045 int res = 1;
4046
4047 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4048
4049 bond_for_each_slave(bond, slave, i) {
4050 slave_no--;
4051 if (slave_no < 0)
4052 break;
4053 }
4054
4055 start_at = slave;
4056
4057 bond_for_each_slave_from(bond, slave, i, start_at) {
4058 if (IS_UP(slave->dev) &&
4059 (slave->link == BOND_LINK_UP) &&
4060 bond_is_active_slave(slave)) {
4061 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4062 break;
4063 }
4064 }
4065
4066 if (res) {
4067 /* no suitable interface, frame not sent */
4068 dev_kfree_skb(skb);
4069 }
4070
4071 return NETDEV_TX_OK;
4072}
4073
4074/*
4075 * in broadcast mode, we send everything to all usable interfaces.
4076 */
4077static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4078{
4079 struct bonding *bond = netdev_priv(bond_dev);
4080 struct slave *slave, *start_at;
4081 struct net_device *tx_dev = NULL;
4082 int i;
4083 int res = 1;
4084
4085 read_lock(&bond->curr_slave_lock);
4086 start_at = bond->curr_active_slave;
4087 read_unlock(&bond->curr_slave_lock);
4088
4089 if (!start_at)
4090 goto out;
4091
4092 bond_for_each_slave_from(bond, slave, i, start_at) {
4093 if (IS_UP(slave->dev) &&
4094 (slave->link == BOND_LINK_UP) &&
4095 bond_is_active_slave(slave)) {
4096 if (tx_dev) {
4097 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4098 if (!skb2) {
4099 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4100 bond_dev->name);
4101 continue;
4102 }
4103
4104 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4105 if (res) {
4106 dev_kfree_skb(skb2);
4107 continue;
4108 }
4109 }
4110 tx_dev = slave->dev;
4111 }
4112 }
4113
4114 if (tx_dev)
4115 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4116
4117out:
4118 if (res)
4119 /* no suitable interface, frame not sent */
4120 dev_kfree_skb(skb);
4121
4122 /* frame sent to all suitable interfaces */
4123 return NETDEV_TX_OK;
4124}
4125
4126/*------------------------- Device initialization ---------------------------*/
4127
4128static void bond_set_xmit_hash_policy(struct bonding *bond)
4129{
4130 switch (bond->params.xmit_policy) {
4131 case BOND_XMIT_POLICY_LAYER23:
4132 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4133 break;
4134 case BOND_XMIT_POLICY_LAYER34:
4135 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4136 break;
4137 case BOND_XMIT_POLICY_LAYER2:
4138 default:
4139 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4140 break;
4141 }
4142}
4143
4144/*
4145 * Lookup the slave that corresponds to a qid
4146 */
4147static inline int bond_slave_override(struct bonding *bond,
4148 struct sk_buff *skb)
4149{
4150 int i, res = 1;
4151 struct slave *slave = NULL;
4152 struct slave *check_slave;
4153
4154 if (!skb->queue_mapping)
4155 return 1;
4156
4157 /* Find out if any slaves have the same mapping as this skb. */
4158 bond_for_each_slave(bond, check_slave, i) {
4159 if (check_slave->queue_id == skb->queue_mapping) {
4160 slave = check_slave;
4161 break;
4162 }
4163 }
4164
4165 /* If the slave isn't UP, use default transmit policy. */
4166 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4167 (slave->link == BOND_LINK_UP)) {
4168 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4169 }
4170
4171 return res;
4172}
4173
4174
4175static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4176{
4177 /*
4178 * This helper function exists to help dev_pick_tx get the correct
4179 * destination queue. Using a helper function skips a call to
4180 * skb_tx_hash and will put the skbs in the queue we expect on their
4181 * way down to the bonding driver.
4182 */
4183 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4184
4185 /*
4186 * Save the original txq to restore before passing to the driver
4187 */
4188 bond_queue_mapping(skb) = skb->queue_mapping;
4189
4190 if (unlikely(txq >= dev->real_num_tx_queues)) {
4191 do {
4192 txq -= dev->real_num_tx_queues;
4193 } while (txq >= dev->real_num_tx_queues);
4194 }
4195 return txq;
4196}
4197
4198static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4199{
4200 struct bonding *bond = netdev_priv(dev);
4201
4202 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4203 if (!bond_slave_override(bond, skb))
4204 return NETDEV_TX_OK;
4205 }
4206
4207 switch (bond->params.mode) {
4208 case BOND_MODE_ROUNDROBIN:
4209 return bond_xmit_roundrobin(skb, dev);
4210 case BOND_MODE_ACTIVEBACKUP:
4211 return bond_xmit_activebackup(skb, dev);
4212 case BOND_MODE_XOR:
4213 return bond_xmit_xor(skb, dev);
4214 case BOND_MODE_BROADCAST:
4215 return bond_xmit_broadcast(skb, dev);
4216 case BOND_MODE_8023AD:
4217 return bond_3ad_xmit_xor(skb, dev);
4218 case BOND_MODE_ALB:
4219 case BOND_MODE_TLB:
4220 return bond_alb_xmit(skb, dev);
4221 default:
4222 /* Should never happen, mode already checked */
4223 pr_err("%s: Error: Unknown bonding mode %d\n",
4224 dev->name, bond->params.mode);
4225 WARN_ON_ONCE(1);
4226 dev_kfree_skb(skb);
4227 return NETDEV_TX_OK;
4228 }
4229}
4230
4231static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4232{
4233 struct bonding *bond = netdev_priv(dev);
4234 netdev_tx_t ret = NETDEV_TX_OK;
4235
4236 /*
4237 * If we risk deadlock from transmitting this in the
4238 * netpoll path, tell netpoll to queue the frame for later tx
4239 */
4240 if (is_netpoll_tx_blocked(dev))
4241 return NETDEV_TX_BUSY;
4242
4243 read_lock(&bond->lock);
4244
4245 if (bond->slave_cnt)
4246 ret = __bond_start_xmit(skb, dev);
4247 else
4248 dev_kfree_skb(skb);
4249
4250 read_unlock(&bond->lock);
4251
4252 return ret;
4253}
4254
4255/*
4256 * set bond mode specific net device operations
4257 */
4258void bond_set_mode_ops(struct bonding *bond, int mode)
4259{
4260 struct net_device *bond_dev = bond->dev;
4261
4262 switch (mode) {
4263 case BOND_MODE_ROUNDROBIN:
4264 break;
4265 case BOND_MODE_ACTIVEBACKUP:
4266 break;
4267 case BOND_MODE_XOR:
4268 bond_set_xmit_hash_policy(bond);
4269 break;
4270 case BOND_MODE_BROADCAST:
4271 break;
4272 case BOND_MODE_8023AD:
4273 bond_set_xmit_hash_policy(bond);
4274 break;
4275 case BOND_MODE_ALB:
4276 /* FALLTHRU */
4277 case BOND_MODE_TLB:
4278 break;
4279 default:
4280 /* Should never happen, mode already checked */
4281 pr_err("%s: Error: Unknown bonding mode %d\n",
4282 bond_dev->name, mode);
4283 break;
4284 }
4285}
4286
4287static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4288 struct ethtool_drvinfo *drvinfo)
4289{
4290 strncpy(drvinfo->driver, DRV_NAME, 32);
4291 strncpy(drvinfo->version, DRV_VERSION, 32);
4292 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4293}
4294
4295static const struct ethtool_ops bond_ethtool_ops = {
4296 .get_drvinfo = bond_ethtool_get_drvinfo,
4297 .get_link = ethtool_op_get_link,
4298};
4299
4300static const struct net_device_ops bond_netdev_ops = {
4301 .ndo_init = bond_init,
4302 .ndo_uninit = bond_uninit,
4303 .ndo_open = bond_open,
4304 .ndo_stop = bond_close,
4305 .ndo_start_xmit = bond_start_xmit,
4306 .ndo_select_queue = bond_select_queue,
4307 .ndo_get_stats64 = bond_get_stats,
4308 .ndo_do_ioctl = bond_do_ioctl,
4309 .ndo_set_multicast_list = bond_set_multicast_list,
4310 .ndo_change_mtu = bond_change_mtu,
4311 .ndo_set_mac_address = bond_set_mac_address,
4312 .ndo_neigh_setup = bond_neigh_setup,
4313 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4314 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4315#ifdef CONFIG_NET_POLL_CONTROLLER
4316 .ndo_netpoll_setup = bond_netpoll_setup,
4317 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4318 .ndo_poll_controller = bond_poll_controller,
4319#endif
4320 .ndo_add_slave = bond_enslave,
4321 .ndo_del_slave = bond_release,
4322 .ndo_fix_features = bond_fix_features,
4323};
4324
4325static void bond_destructor(struct net_device *bond_dev)
4326{
4327 struct bonding *bond = netdev_priv(bond_dev);
4328 if (bond->wq)
4329 destroy_workqueue(bond->wq);
4330 free_netdev(bond_dev);
4331}
4332
4333static void bond_setup(struct net_device *bond_dev)
4334{
4335 struct bonding *bond = netdev_priv(bond_dev);
4336
4337 /* initialize rwlocks */
4338 rwlock_init(&bond->lock);
4339 rwlock_init(&bond->curr_slave_lock);
4340
4341 bond->params = bonding_defaults;
4342
4343 /* Initialize pointers */
4344 bond->dev = bond_dev;
4345 INIT_LIST_HEAD(&bond->vlan_list);
4346
4347 /* Initialize the device entry points */
4348 ether_setup(bond_dev);
4349 bond_dev->netdev_ops = &bond_netdev_ops;
4350 bond_dev->ethtool_ops = &bond_ethtool_ops;
4351 bond_set_mode_ops(bond, bond->params.mode);
4352
4353 bond_dev->destructor = bond_destructor;
4354
4355 /* Initialize the device options */
4356 bond_dev->tx_queue_len = 0;
4357 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4358 bond_dev->priv_flags |= IFF_BONDING;
4359 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4360
4361 /* At first, we block adding VLANs. That's the only way to
4362 * prevent problems that occur when adding VLANs over an
4363 * empty bond. The block will be removed once non-challenged
4364 * slaves are enslaved.
4365 */
4366 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4367
4368 /* don't acquire bond device's netif_tx_lock when
4369 * transmitting */
4370 bond_dev->features |= NETIF_F_LLTX;
4371
4372 /* By default, we declare the bond to be fully
4373 * VLAN hardware accelerated capable. Special
4374 * care is taken in the various xmit functions
4375 * when there are slaves that are not hw accel
4376 * capable
4377 */
4378
4379 bond_dev->hw_features = BOND_VLAN_FEATURES |
4380 NETIF_F_HW_VLAN_TX |
4381 NETIF_F_HW_VLAN_RX |
4382 NETIF_F_HW_VLAN_FILTER;
4383
4384 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
4385 bond_dev->features |= bond_dev->hw_features;
4386}
4387
4388static void bond_work_cancel_all(struct bonding *bond)
4389{
4390 write_lock_bh(&bond->lock);
4391 bond->kill_timers = 1;
4392 write_unlock_bh(&bond->lock);
4393
4394 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4395 cancel_delayed_work(&bond->mii_work);
4396
4397 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4398 cancel_delayed_work(&bond->arp_work);
4399
4400 if (bond->params.mode == BOND_MODE_ALB &&
4401 delayed_work_pending(&bond->alb_work))
4402 cancel_delayed_work(&bond->alb_work);
4403
4404 if (bond->params.mode == BOND_MODE_8023AD &&
4405 delayed_work_pending(&bond->ad_work))
4406 cancel_delayed_work(&bond->ad_work);
4407
4408 if (delayed_work_pending(&bond->mcast_work))
4409 cancel_delayed_work(&bond->mcast_work);
4410}
4411
4412/*
4413* Destroy a bonding device.
4414* Must be under rtnl_lock when this function is called.
4415*/
4416static void bond_uninit(struct net_device *bond_dev)
4417{
4418 struct bonding *bond = netdev_priv(bond_dev);
4419 struct vlan_entry *vlan, *tmp;
4420
4421 bond_netpoll_cleanup(bond_dev);
4422
4423 /* Release the bonded slaves */
4424 bond_release_all(bond_dev);
4425
4426 list_del(&bond->bond_list);
4427
4428 bond_work_cancel_all(bond);
4429
4430 bond_remove_proc_entry(bond);
4431
4432 bond_debug_unregister(bond);
4433
4434 __hw_addr_flush(&bond->mc_list);
4435
4436 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4437 list_del(&vlan->vlan_list);
4438 kfree(vlan);
4439 }
4440}
4441
4442/*------------------------- Module initialization ---------------------------*/
4443
4444/*
4445 * Convert string input module parms. Accept either the
4446 * number of the mode or its string name. A bit complicated because
4447 * some mode names are substrings of other names, and calls from sysfs
4448 * may have whitespace in the name (trailing newlines, for example).
4449 */
4450int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4451{
4452 int modeint = -1, i, rv;
4453 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4454
4455 for (p = (char *)buf; *p; p++)
4456 if (!(isdigit(*p) || isspace(*p)))
4457 break;
4458
4459 if (*p)
4460 rv = sscanf(buf, "%20s", modestr);
4461 else
4462 rv = sscanf(buf, "%d", &modeint);
4463
4464 if (!rv)
4465 return -1;
4466
4467 for (i = 0; tbl[i].modename; i++) {
4468 if (modeint == tbl[i].mode)
4469 return tbl[i].mode;
4470 if (strcmp(modestr, tbl[i].modename) == 0)
4471 return tbl[i].mode;
4472 }
4473
4474 return -1;
4475}
4476
4477static int bond_check_params(struct bond_params *params)
4478{
4479 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4480
4481 /*
4482 * Convert string parameters.
4483 */
4484 if (mode) {
4485 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4486 if (bond_mode == -1) {
4487 pr_err("Error: Invalid bonding mode \"%s\"\n",
4488 mode == NULL ? "NULL" : mode);
4489 return -EINVAL;
4490 }
4491 }
4492
4493 if (xmit_hash_policy) {
4494 if ((bond_mode != BOND_MODE_XOR) &&
4495 (bond_mode != BOND_MODE_8023AD)) {
4496 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4497 bond_mode_name(bond_mode));
4498 } else {
4499 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4500 xmit_hashtype_tbl);
4501 if (xmit_hashtype == -1) {
4502 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4503 xmit_hash_policy == NULL ? "NULL" :
4504 xmit_hash_policy);
4505 return -EINVAL;
4506 }
4507 }
4508 }
4509
4510 if (lacp_rate) {
4511 if (bond_mode != BOND_MODE_8023AD) {
4512 pr_info("lacp_rate param is irrelevant in mode %s\n",
4513 bond_mode_name(bond_mode));
4514 } else {
4515 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4516 if (lacp_fast == -1) {
4517 pr_err("Error: Invalid lacp rate \"%s\"\n",
4518 lacp_rate == NULL ? "NULL" : lacp_rate);
4519 return -EINVAL;
4520 }
4521 }
4522 }
4523
4524 if (ad_select) {
4525 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4526 if (params->ad_select == -1) {
4527 pr_err("Error: Invalid ad_select \"%s\"\n",
4528 ad_select == NULL ? "NULL" : ad_select);
4529 return -EINVAL;
4530 }
4531
4532 if (bond_mode != BOND_MODE_8023AD) {
4533 pr_warning("ad_select param only affects 802.3ad mode\n");
4534 }
4535 } else {
4536 params->ad_select = BOND_AD_STABLE;
4537 }
4538
4539 if (max_bonds < 0) {
4540 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4541 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4542 max_bonds = BOND_DEFAULT_MAX_BONDS;
4543 }
4544
4545 if (miimon < 0) {
4546 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4547 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4548 miimon = BOND_LINK_MON_INTERV;
4549 }
4550
4551 if (updelay < 0) {
4552 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4553 updelay, INT_MAX);
4554 updelay = 0;
4555 }
4556
4557 if (downdelay < 0) {
4558 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4559 downdelay, INT_MAX);
4560 downdelay = 0;
4561 }
4562
4563 if ((use_carrier != 0) && (use_carrier != 1)) {
4564 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4565 use_carrier);
4566 use_carrier = 1;
4567 }
4568
4569 if (num_peer_notif < 0 || num_peer_notif > 255) {
4570 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4571 num_peer_notif);
4572 num_peer_notif = 1;
4573 }
4574
4575 /* reset values for 802.3ad */
4576 if (bond_mode == BOND_MODE_8023AD) {
4577 if (!miimon) {
4578 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");
4579 pr_warning("Forcing miimon to 100msec\n");
4580 miimon = 100;
4581 }
4582 }
4583
4584 if (tx_queues < 1 || tx_queues > 255) {
4585 pr_warning("Warning: tx_queues (%d) should be between "
4586 "1 and 255, resetting to %d\n",
4587 tx_queues, BOND_DEFAULT_TX_QUEUES);
4588 tx_queues = BOND_DEFAULT_TX_QUEUES;
4589 }
4590
4591 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4592 pr_warning("Warning: all_slaves_active module parameter (%d), "
4593 "not of valid value (0/1), so it was set to "
4594 "0\n", all_slaves_active);
4595 all_slaves_active = 0;
4596 }
4597
4598 if (resend_igmp < 0 || resend_igmp > 255) {
4599 pr_warning("Warning: resend_igmp (%d) should be between "
4600 "0 and 255, resetting to %d\n",
4601 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4602 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4603 }
4604
4605 /* reset values for TLB/ALB */
4606 if ((bond_mode == BOND_MODE_TLB) ||
4607 (bond_mode == BOND_MODE_ALB)) {
4608 if (!miimon) {
4609 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");
4610 pr_warning("Forcing miimon to 100msec\n");
4611 miimon = 100;
4612 }
4613 }
4614
4615 if (bond_mode == BOND_MODE_ALB) {
4616 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",
4617 updelay);
4618 }
4619
4620 if (!miimon) {
4621 if (updelay || downdelay) {
4622 /* just warn the user the up/down delay will have
4623 * no effect since miimon is zero...
4624 */
4625 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",
4626 updelay, downdelay);
4627 }
4628 } else {
4629 /* don't allow arp monitoring */
4630 if (arp_interval) {
4631 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4632 miimon, arp_interval);
4633 arp_interval = 0;
4634 }
4635
4636 if ((updelay % miimon) != 0) {
4637 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4638 updelay, miimon,
4639 (updelay / miimon) * miimon);
4640 }
4641
4642 updelay /= miimon;
4643
4644 if ((downdelay % miimon) != 0) {
4645 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4646 downdelay, miimon,
4647 (downdelay / miimon) * miimon);
4648 }
4649
4650 downdelay /= miimon;
4651 }
4652
4653 if (arp_interval < 0) {
4654 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4655 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4656 arp_interval = BOND_LINK_ARP_INTERV;
4657 }
4658
4659 for (arp_ip_count = 0;
4660 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4661 arp_ip_count++) {
4662 /* not complete check, but should be good enough to
4663 catch mistakes */
4664 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4665 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4666 arp_ip_target[arp_ip_count]);
4667 arp_interval = 0;
4668 } else {
4669 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4670 arp_target[arp_ip_count] = ip;
4671 }
4672 }
4673
4674 if (arp_interval && !arp_ip_count) {
4675 /* don't allow arping if no arp_ip_target given... */
4676 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4677 arp_interval);
4678 arp_interval = 0;
4679 }
4680
4681 if (arp_validate) {
4682 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4683 pr_err("arp_validate only supported in active-backup mode\n");
4684 return -EINVAL;
4685 }
4686 if (!arp_interval) {
4687 pr_err("arp_validate requires arp_interval\n");
4688 return -EINVAL;
4689 }
4690
4691 arp_validate_value = bond_parse_parm(arp_validate,
4692 arp_validate_tbl);
4693 if (arp_validate_value == -1) {
4694 pr_err("Error: invalid arp_validate \"%s\"\n",
4695 arp_validate == NULL ? "NULL" : arp_validate);
4696 return -EINVAL;
4697 }
4698 } else
4699 arp_validate_value = 0;
4700
4701 if (miimon) {
4702 pr_info("MII link monitoring set to %d ms\n", miimon);
4703 } else if (arp_interval) {
4704 int i;
4705
4706 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4707 arp_interval,
4708 arp_validate_tbl[arp_validate_value].modename,
4709 arp_ip_count);
4710
4711 for (i = 0; i < arp_ip_count; i++)
4712 pr_info(" %s", arp_ip_target[i]);
4713
4714 pr_info("\n");
4715
4716 } else if (max_bonds) {
4717 /* miimon and arp_interval not set, we need one so things
4718 * work as expected, see bonding.txt for details
4719 */
4720 pr_debug("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");
4721 }
4722
4723 if (primary && !USES_PRIMARY(bond_mode)) {
4724 /* currently, using a primary only makes sense
4725 * in active backup, TLB or ALB modes
4726 */
4727 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4728 primary, bond_mode_name(bond_mode));
4729 primary = NULL;
4730 }
4731
4732 if (primary && primary_reselect) {
4733 primary_reselect_value = bond_parse_parm(primary_reselect,
4734 pri_reselect_tbl);
4735 if (primary_reselect_value == -1) {
4736 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4737 primary_reselect ==
4738 NULL ? "NULL" : primary_reselect);
4739 return -EINVAL;
4740 }
4741 } else {
4742 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4743 }
4744
4745 if (fail_over_mac) {
4746 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4747 fail_over_mac_tbl);
4748 if (fail_over_mac_value == -1) {
4749 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4750 arp_validate == NULL ? "NULL" : arp_validate);
4751 return -EINVAL;
4752 }
4753
4754 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4755 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4756 } else {
4757 fail_over_mac_value = BOND_FOM_NONE;
4758 }
4759
4760 /* fill params struct with the proper values */
4761 params->mode = bond_mode;
4762 params->xmit_policy = xmit_hashtype;
4763 params->miimon = miimon;
4764 params->num_peer_notif = num_peer_notif;
4765 params->arp_interval = arp_interval;
4766 params->arp_validate = arp_validate_value;
4767 params->updelay = updelay;
4768 params->downdelay = downdelay;
4769 params->use_carrier = use_carrier;
4770 params->lacp_fast = lacp_fast;
4771 params->primary[0] = 0;
4772 params->primary_reselect = primary_reselect_value;
4773 params->fail_over_mac = fail_over_mac_value;
4774 params->tx_queues = tx_queues;
4775 params->all_slaves_active = all_slaves_active;
4776 params->resend_igmp = resend_igmp;
4777 params->min_links = min_links;
4778
4779 if (primary) {
4780 strncpy(params->primary, primary, IFNAMSIZ);
4781 params->primary[IFNAMSIZ - 1] = 0;
4782 }
4783
4784 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4785
4786 return 0;
4787}
4788
4789static struct lock_class_key bonding_netdev_xmit_lock_key;
4790static struct lock_class_key bonding_netdev_addr_lock_key;
4791
4792static void bond_set_lockdep_class_one(struct net_device *dev,
4793 struct netdev_queue *txq,
4794 void *_unused)
4795{
4796 lockdep_set_class(&txq->_xmit_lock,
4797 &bonding_netdev_xmit_lock_key);
4798}
4799
4800static void bond_set_lockdep_class(struct net_device *dev)
4801{
4802 lockdep_set_class(&dev->addr_list_lock,
4803 &bonding_netdev_addr_lock_key);
4804 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4805}
4806
4807/*
4808 * Called from registration process
4809 */
4810static int bond_init(struct net_device *bond_dev)
4811{
4812 struct bonding *bond = netdev_priv(bond_dev);
4813 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4814 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4815
4816 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4817
4818 /*
4819 * Initialize locks that may be required during
4820 * en/deslave operations. All of the bond_open work
4821 * (of which this is part) should really be moved to
4822 * a phase prior to dev_open
4823 */
4824 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4825 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4826
4827 bond->wq = create_singlethread_workqueue(bond_dev->name);
4828 if (!bond->wq)
4829 return -ENOMEM;
4830
4831 bond_set_lockdep_class(bond_dev);
4832
4833 bond_create_proc_entry(bond);
4834 list_add_tail(&bond->bond_list, &bn->dev_list);
4835
4836 bond_prepare_sysfs_group(bond);
4837
4838 bond_debug_register(bond);
4839
4840 __hw_addr_init(&bond->mc_list);
4841 return 0;
4842}
4843
4844static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4845{
4846 if (tb[IFLA_ADDRESS]) {
4847 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4848 return -EINVAL;
4849 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4850 return -EADDRNOTAVAIL;
4851 }
4852 return 0;
4853}
4854
4855static struct rtnl_link_ops bond_link_ops __read_mostly = {
4856 .kind = "bond",
4857 .priv_size = sizeof(struct bonding),
4858 .setup = bond_setup,
4859 .validate = bond_validate,
4860};
4861
4862/* Create a new bond based on the specified name and bonding parameters.
4863 * If name is NULL, obtain a suitable "bond%d" name for us.
4864 * Caller must NOT hold rtnl_lock; we need to release it here before we
4865 * set up our sysfs entries.
4866 */
4867int bond_create(struct net *net, const char *name)
4868{
4869 struct net_device *bond_dev;
4870 int res;
4871
4872 rtnl_lock();
4873
4874 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4875 name ? name : "bond%d",
4876 bond_setup, tx_queues);
4877 if (!bond_dev) {
4878 pr_err("%s: eek! can't alloc netdev!\n", name);
4879 rtnl_unlock();
4880 return -ENOMEM;
4881 }
4882
4883 dev_net_set(bond_dev, net);
4884 bond_dev->rtnl_link_ops = &bond_link_ops;
4885
4886 res = register_netdevice(bond_dev);
4887
4888 netif_carrier_off(bond_dev);
4889
4890 rtnl_unlock();
4891 if (res < 0)
4892 bond_destructor(bond_dev);
4893 return res;
4894}
4895
4896static int __net_init bond_net_init(struct net *net)
4897{
4898 struct bond_net *bn = net_generic(net, bond_net_id);
4899
4900 bn->net = net;
4901 INIT_LIST_HEAD(&bn->dev_list);
4902
4903 bond_create_proc_dir(bn);
4904
4905 return 0;
4906}
4907
4908static void __net_exit bond_net_exit(struct net *net)
4909{
4910 struct bond_net *bn = net_generic(net, bond_net_id);
4911
4912 bond_destroy_proc_dir(bn);
4913}
4914
4915static struct pernet_operations bond_net_ops = {
4916 .init = bond_net_init,
4917 .exit = bond_net_exit,
4918 .id = &bond_net_id,
4919 .size = sizeof(struct bond_net),
4920};
4921
4922static int __init bonding_init(void)
4923{
4924 int i;
4925 int res;
4926
4927 pr_info("%s", bond_version);
4928
4929 res = bond_check_params(&bonding_defaults);
4930 if (res)
4931 goto out;
4932
4933 res = register_pernet_subsys(&bond_net_ops);
4934 if (res)
4935 goto out;
4936
4937 res = rtnl_link_register(&bond_link_ops);
4938 if (res)
4939 goto err_link;
4940
4941 bond_create_debugfs();
4942
4943 for (i = 0; i < max_bonds; i++) {
4944 res = bond_create(&init_net, NULL);
4945 if (res)
4946 goto err;
4947 }
4948
4949 res = bond_create_sysfs();
4950 if (res)
4951 goto err;
4952
4953 register_netdevice_notifier(&bond_netdev_notifier);
4954 register_inetaddr_notifier(&bond_inetaddr_notifier);
4955out:
4956 return res;
4957err:
4958 rtnl_link_unregister(&bond_link_ops);
4959err_link:
4960 unregister_pernet_subsys(&bond_net_ops);
4961 goto out;
4962
4963}
4964
4965static void __exit bonding_exit(void)
4966{
4967 unregister_netdevice_notifier(&bond_netdev_notifier);
4968 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4969
4970 bond_destroy_sysfs();
4971 bond_destroy_debugfs();
4972
4973 rtnl_link_unregister(&bond_link_ops);
4974 unregister_pernet_subsys(&bond_net_ops);
4975
4976#ifdef CONFIG_NET_POLL_CONTROLLER
4977 /*
4978 * Make sure we don't have an imbalance on our netpoll blocking
4979 */
4980 WARN_ON(atomic_read(&netpoll_block_tx));
4981#endif
4982}
4983
4984module_init(bonding_init);
4985module_exit(bonding_exit);
4986MODULE_LICENSE("GPL");
4987MODULE_VERSION(DRV_VERSION);
4988MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4989MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4990MODULE_ALIAS_RTNL_LINK("bond");
1/*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
32 */
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/types.h>
37#include <linux/fcntl.h>
38#include <linux/interrupt.h>
39#include <linux/ptrace.h>
40#include <linux/ioport.h>
41#include <linux/in.h>
42#include <net/ip.h>
43#include <linux/ip.h>
44#include <linux/icmp.h>
45#include <linux/icmpv6.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/dma.h>
58#include <linux/uaccess.h>
59#include <linux/errno.h>
60#include <linux/netdevice.h>
61#include <linux/inetdevice.h>
62#include <linux/igmp.h>
63#include <linux/etherdevice.h>
64#include <linux/skbuff.h>
65#include <net/sock.h>
66#include <linux/rtnetlink.h>
67#include <linux/smp.h>
68#include <linux/if_ether.h>
69#include <net/arp.h>
70#include <linux/mii.h>
71#include <linux/ethtool.h>
72#include <linux/if_vlan.h>
73#include <linux/if_bonding.h>
74#include <linux/jiffies.h>
75#include <linux/preempt.h>
76#include <net/route.h>
77#include <net/net_namespace.h>
78#include <net/netns/generic.h>
79#include <net/pkt_sched.h>
80#include <linux/rculist.h>
81#include <net/flow_dissector.h>
82#include <net/xfrm.h>
83#include <net/bonding.h>
84#include <net/bond_3ad.h>
85#include <net/bond_alb.h>
86
87#include "bonding_priv.h"
88
89/*---------------------------- Module parameters ----------------------------*/
90
91/* monitor all links that often (in milliseconds). <=0 disables monitoring */
92
93static int max_bonds = BOND_DEFAULT_MAX_BONDS;
94static int tx_queues = BOND_DEFAULT_TX_QUEUES;
95static int num_peer_notif = 1;
96static int miimon;
97static int updelay;
98static int downdelay;
99static int use_carrier = 1;
100static char *mode;
101static char *primary;
102static char *primary_reselect;
103static char *lacp_rate;
104static int min_links;
105static char *ad_select;
106static char *xmit_hash_policy;
107static int arp_interval;
108static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
109static char *arp_validate;
110static char *arp_all_targets;
111static char *fail_over_mac;
112static int all_slaves_active;
113static struct bond_params bonding_defaults;
114static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
115static int packets_per_slave = 1;
116static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
117
118module_param(max_bonds, int, 0);
119MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
120module_param(tx_queues, int, 0);
121MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
122module_param_named(num_grat_arp, num_peer_notif, int, 0644);
123MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
124 "failover event (alias of num_unsol_na)");
125module_param_named(num_unsol_na, num_peer_notif, int, 0644);
126MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
127 "failover event (alias of num_grat_arp)");
128module_param(miimon, int, 0);
129MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
130module_param(updelay, int, 0);
131MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
132module_param(downdelay, int, 0);
133MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
134 "in milliseconds");
135module_param(use_carrier, int, 0);
136MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
137 "0 for off, 1 for on (default)");
138module_param(mode, charp, 0);
139MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
140 "1 for active-backup, 2 for balance-xor, "
141 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
142 "6 for balance-alb");
143module_param(primary, charp, 0);
144MODULE_PARM_DESC(primary, "Primary network device to use");
145module_param(primary_reselect, charp, 0);
146MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
147 "once it comes up; "
148 "0 for always (default), "
149 "1 for only if speed of primary is "
150 "better, "
151 "2 for only on active slave "
152 "failure");
153module_param(lacp_rate, charp, 0);
154MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
155 "0 for slow, 1 for fast");
156module_param(ad_select, charp, 0);
157MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
158 "0 for stable (default), 1 for bandwidth, "
159 "2 for count");
160module_param(min_links, int, 0);
161MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
162
163module_param(xmit_hash_policy, charp, 0);
164MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
165 "0 for layer 2 (default), 1 for layer 3+4, "
166 "2 for layer 2+3, 3 for encap layer 2+3, "
167 "4 for encap layer 3+4");
168module_param(arp_interval, int, 0);
169MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
170module_param_array(arp_ip_target, charp, NULL, 0);
171MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
172module_param(arp_validate, charp, 0);
173MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
174 "0 for none (default), 1 for active, "
175 "2 for backup, 3 for all");
176module_param(arp_all_targets, charp, 0);
177MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
178module_param(fail_over_mac, charp, 0);
179MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
180 "the same MAC; 0 for none (default), "
181 "1 for active, 2 for follow");
182module_param(all_slaves_active, int, 0);
183MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
184 "by setting active flag for all slaves; "
185 "0 for never (default), 1 for always.");
186module_param(resend_igmp, int, 0);
187MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
188 "link failure");
189module_param(packets_per_slave, int, 0);
190MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
191 "mode; 0 for a random slave, 1 packet per "
192 "slave (default), >1 packets per slave.");
193module_param(lp_interval, uint, 0);
194MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
195 "the bonding driver sends learning packets to "
196 "each slaves peer switch. The default is 1.");
197
198/*----------------------------- Global variables ----------------------------*/
199
200#ifdef CONFIG_NET_POLL_CONTROLLER
201atomic_t netpoll_block_tx = ATOMIC_INIT(0);
202#endif
203
204unsigned int bond_net_id __read_mostly;
205
206static const struct flow_dissector_key flow_keys_bonding_keys[] = {
207 {
208 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
209 .offset = offsetof(struct flow_keys, control),
210 },
211 {
212 .key_id = FLOW_DISSECTOR_KEY_BASIC,
213 .offset = offsetof(struct flow_keys, basic),
214 },
215 {
216 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
217 .offset = offsetof(struct flow_keys, addrs.v4addrs),
218 },
219 {
220 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
221 .offset = offsetof(struct flow_keys, addrs.v6addrs),
222 },
223 {
224 .key_id = FLOW_DISSECTOR_KEY_TIPC,
225 .offset = offsetof(struct flow_keys, addrs.tipckey),
226 },
227 {
228 .key_id = FLOW_DISSECTOR_KEY_PORTS,
229 .offset = offsetof(struct flow_keys, ports),
230 },
231 {
232 .key_id = FLOW_DISSECTOR_KEY_ICMP,
233 .offset = offsetof(struct flow_keys, icmp),
234 },
235 {
236 .key_id = FLOW_DISSECTOR_KEY_VLAN,
237 .offset = offsetof(struct flow_keys, vlan),
238 },
239 {
240 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
241 .offset = offsetof(struct flow_keys, tags),
242 },
243 {
244 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
245 .offset = offsetof(struct flow_keys, keyid),
246 },
247};
248
249static struct flow_dissector flow_keys_bonding __read_mostly;
250
251/*-------------------------- Forward declarations ---------------------------*/
252
253static int bond_init(struct net_device *bond_dev);
254static void bond_uninit(struct net_device *bond_dev);
255static void bond_get_stats(struct net_device *bond_dev,
256 struct rtnl_link_stats64 *stats);
257static void bond_slave_arr_handler(struct work_struct *work);
258static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
259 int mod);
260static void bond_netdev_notify_work(struct work_struct *work);
261
262/*---------------------------- General routines -----------------------------*/
263
264const char *bond_mode_name(int mode)
265{
266 static const char *names[] = {
267 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
268 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
269 [BOND_MODE_XOR] = "load balancing (xor)",
270 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
271 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
272 [BOND_MODE_TLB] = "transmit load balancing",
273 [BOND_MODE_ALB] = "adaptive load balancing",
274 };
275
276 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
277 return "unknown";
278
279 return names[mode];
280}
281
282/**
283 * bond_dev_queue_xmit - Prepare skb for xmit.
284 *
285 * @bond: bond device that got this skb for tx.
286 * @skb: hw accel VLAN tagged skb to transmit
287 * @slave_dev: slave that is supposed to xmit this skbuff
288 */
289netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
290 struct net_device *slave_dev)
291{
292 skb->dev = slave_dev;
293
294 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
295 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
296 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
297
298 if (unlikely(netpoll_tx_running(bond->dev)))
299 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
300
301 return dev_queue_xmit(skb);
302}
303
304/*---------------------------------- VLAN -----------------------------------*/
305
306/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
307 * We don't protect the slave list iteration with a lock because:
308 * a. This operation is performed in IOCTL context,
309 * b. The operation is protected by the RTNL semaphore in the 8021q code,
310 * c. Holding a lock with BH disabled while directly calling a base driver
311 * entry point is generally a BAD idea.
312 *
313 * The design of synchronization/protection for this operation in the 8021q
314 * module is good for one or more VLAN devices over a single physical device
315 * and cannot be extended for a teaming solution like bonding, so there is a
316 * potential race condition here where a net device from the vlan group might
317 * be referenced (either by a base driver or the 8021q code) while it is being
318 * removed from the system. However, it turns out we're not making matters
319 * worse, and if it works for regular VLAN usage it will work here too.
320*/
321
322/**
323 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
324 * @bond_dev: bonding net device that got called
325 * @proto: network protocol ID
326 * @vid: vlan id being added
327 */
328static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
329 __be16 proto, u16 vid)
330{
331 struct bonding *bond = netdev_priv(bond_dev);
332 struct slave *slave, *rollback_slave;
333 struct list_head *iter;
334 int res;
335
336 bond_for_each_slave(bond, slave, iter) {
337 res = vlan_vid_add(slave->dev, proto, vid);
338 if (res)
339 goto unwind;
340 }
341
342 return 0;
343
344unwind:
345 /* unwind to the slave that failed */
346 bond_for_each_slave(bond, rollback_slave, iter) {
347 if (rollback_slave == slave)
348 break;
349
350 vlan_vid_del(rollback_slave->dev, proto, vid);
351 }
352
353 return res;
354}
355
356/**
357 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
358 * @bond_dev: bonding net device that got called
359 * @proto: network protocol ID
360 * @vid: vlan id being removed
361 */
362static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
363 __be16 proto, u16 vid)
364{
365 struct bonding *bond = netdev_priv(bond_dev);
366 struct list_head *iter;
367 struct slave *slave;
368
369 bond_for_each_slave(bond, slave, iter)
370 vlan_vid_del(slave->dev, proto, vid);
371
372 if (bond_is_lb(bond))
373 bond_alb_clear_vlan(bond, vid);
374
375 return 0;
376}
377
378/*---------------------------------- XFRM -----------------------------------*/
379
380#ifdef CONFIG_XFRM_OFFLOAD
381/**
382 * bond_ipsec_add_sa - program device with a security association
383 * @xs: pointer to transformer state struct
384 **/
385static int bond_ipsec_add_sa(struct xfrm_state *xs)
386{
387 struct net_device *bond_dev = xs->xso.dev;
388 struct bonding *bond;
389 struct slave *slave;
390
391 if (!bond_dev)
392 return -EINVAL;
393
394 bond = netdev_priv(bond_dev);
395 slave = rcu_dereference(bond->curr_active_slave);
396 xs->xso.real_dev = slave->dev;
397 bond->xs = xs;
398
399 if (!(slave->dev->xfrmdev_ops
400 && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
401 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
402 return -EINVAL;
403 }
404
405 return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
406}
407
408/**
409 * bond_ipsec_del_sa - clear out this specific SA
410 * @xs: pointer to transformer state struct
411 **/
412static void bond_ipsec_del_sa(struct xfrm_state *xs)
413{
414 struct net_device *bond_dev = xs->xso.dev;
415 struct bonding *bond;
416 struct slave *slave;
417
418 if (!bond_dev)
419 return;
420
421 bond = netdev_priv(bond_dev);
422 slave = rcu_dereference(bond->curr_active_slave);
423
424 if (!slave)
425 return;
426
427 xs->xso.real_dev = slave->dev;
428
429 if (!(slave->dev->xfrmdev_ops
430 && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
431 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
432 return;
433 }
434
435 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
436}
437
438/**
439 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
440 * @skb: current data packet
441 * @xs: pointer to transformer state struct
442 **/
443static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
444{
445 struct net_device *bond_dev = xs->xso.dev;
446 struct bonding *bond = netdev_priv(bond_dev);
447 struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
448 struct net_device *slave_dev = curr_active->dev;
449
450 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
451 return true;
452
453 if (!(slave_dev->xfrmdev_ops
454 && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
455 slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
456 return false;
457 }
458
459 xs->xso.real_dev = slave_dev;
460 return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
461}
462
463static const struct xfrmdev_ops bond_xfrmdev_ops = {
464 .xdo_dev_state_add = bond_ipsec_add_sa,
465 .xdo_dev_state_delete = bond_ipsec_del_sa,
466 .xdo_dev_offload_ok = bond_ipsec_offload_ok,
467};
468#endif /* CONFIG_XFRM_OFFLOAD */
469
470/*------------------------------- Link status -------------------------------*/
471
472/* Set the carrier state for the master according to the state of its
473 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
474 * do special 802.3ad magic.
475 *
476 * Returns zero if carrier state does not change, nonzero if it does.
477 */
478int bond_set_carrier(struct bonding *bond)
479{
480 struct list_head *iter;
481 struct slave *slave;
482
483 if (!bond_has_slaves(bond))
484 goto down;
485
486 if (BOND_MODE(bond) == BOND_MODE_8023AD)
487 return bond_3ad_set_carrier(bond);
488
489 bond_for_each_slave(bond, slave, iter) {
490 if (slave->link == BOND_LINK_UP) {
491 if (!netif_carrier_ok(bond->dev)) {
492 netif_carrier_on(bond->dev);
493 return 1;
494 }
495 return 0;
496 }
497 }
498
499down:
500 if (netif_carrier_ok(bond->dev)) {
501 netif_carrier_off(bond->dev);
502 return 1;
503 }
504 return 0;
505}
506
507/* Get link speed and duplex from the slave's base driver
508 * using ethtool. If for some reason the call fails or the
509 * values are invalid, set speed and duplex to -1,
510 * and return. Return 1 if speed or duplex settings are
511 * UNKNOWN; 0 otherwise.
512 */
513static int bond_update_speed_duplex(struct slave *slave)
514{
515 struct net_device *slave_dev = slave->dev;
516 struct ethtool_link_ksettings ecmd;
517 int res;
518
519 slave->speed = SPEED_UNKNOWN;
520 slave->duplex = DUPLEX_UNKNOWN;
521
522 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
523 if (res < 0)
524 return 1;
525 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
526 return 1;
527 switch (ecmd.base.duplex) {
528 case DUPLEX_FULL:
529 case DUPLEX_HALF:
530 break;
531 default:
532 return 1;
533 }
534
535 slave->speed = ecmd.base.speed;
536 slave->duplex = ecmd.base.duplex;
537
538 return 0;
539}
540
541const char *bond_slave_link_status(s8 link)
542{
543 switch (link) {
544 case BOND_LINK_UP:
545 return "up";
546 case BOND_LINK_FAIL:
547 return "going down";
548 case BOND_LINK_DOWN:
549 return "down";
550 case BOND_LINK_BACK:
551 return "going back";
552 default:
553 return "unknown";
554 }
555}
556
557/* if <dev> supports MII link status reporting, check its link status.
558 *
559 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
560 * depending upon the setting of the use_carrier parameter.
561 *
562 * Return either BMSR_LSTATUS, meaning that the link is up (or we
563 * can't tell and just pretend it is), or 0, meaning that the link is
564 * down.
565 *
566 * If reporting is non-zero, instead of faking link up, return -1 if
567 * both ETHTOOL and MII ioctls fail (meaning the device does not
568 * support them). If use_carrier is set, return whatever it says.
569 * It'd be nice if there was a good way to tell if a driver supports
570 * netif_carrier, but there really isn't.
571 */
572static int bond_check_dev_link(struct bonding *bond,
573 struct net_device *slave_dev, int reporting)
574{
575 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
576 int (*ioctl)(struct net_device *, struct ifreq *, int);
577 struct ifreq ifr;
578 struct mii_ioctl_data *mii;
579
580 if (!reporting && !netif_running(slave_dev))
581 return 0;
582
583 if (bond->params.use_carrier)
584 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
585
586 /* Try to get link status using Ethtool first. */
587 if (slave_dev->ethtool_ops->get_link)
588 return slave_dev->ethtool_ops->get_link(slave_dev) ?
589 BMSR_LSTATUS : 0;
590
591 /* Ethtool can't be used, fallback to MII ioctls. */
592 ioctl = slave_ops->ndo_do_ioctl;
593 if (ioctl) {
594 /* TODO: set pointer to correct ioctl on a per team member
595 * bases to make this more efficient. that is, once
596 * we determine the correct ioctl, we will always
597 * call it and not the others for that team
598 * member.
599 */
600
601 /* We cannot assume that SIOCGMIIPHY will also read a
602 * register; not all network drivers (e.g., e100)
603 * support that.
604 */
605
606 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
607 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
608 mii = if_mii(&ifr);
609 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
610 mii->reg_num = MII_BMSR;
611 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
612 return mii->val_out & BMSR_LSTATUS;
613 }
614 }
615
616 /* If reporting, report that either there's no dev->do_ioctl,
617 * or both SIOCGMIIREG and get_link failed (meaning that we
618 * cannot report link status). If not reporting, pretend
619 * we're ok.
620 */
621 return reporting ? -1 : BMSR_LSTATUS;
622}
623
624/*----------------------------- Multicast list ------------------------------*/
625
626/* Push the promiscuity flag down to appropriate slaves */
627static int bond_set_promiscuity(struct bonding *bond, int inc)
628{
629 struct list_head *iter;
630 int err = 0;
631
632 if (bond_uses_primary(bond)) {
633 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
634
635 if (curr_active)
636 err = dev_set_promiscuity(curr_active->dev, inc);
637 } else {
638 struct slave *slave;
639
640 bond_for_each_slave(bond, slave, iter) {
641 err = dev_set_promiscuity(slave->dev, inc);
642 if (err)
643 return err;
644 }
645 }
646 return err;
647}
648
649/* Push the allmulti flag down to all slaves */
650static int bond_set_allmulti(struct bonding *bond, int inc)
651{
652 struct list_head *iter;
653 int err = 0;
654
655 if (bond_uses_primary(bond)) {
656 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
657
658 if (curr_active)
659 err = dev_set_allmulti(curr_active->dev, inc);
660 } else {
661 struct slave *slave;
662
663 bond_for_each_slave(bond, slave, iter) {
664 err = dev_set_allmulti(slave->dev, inc);
665 if (err)
666 return err;
667 }
668 }
669 return err;
670}
671
672/* Retrieve the list of registered multicast addresses for the bonding
673 * device and retransmit an IGMP JOIN request to the current active
674 * slave.
675 */
676static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
677{
678 struct bonding *bond = container_of(work, struct bonding,
679 mcast_work.work);
680
681 if (!rtnl_trylock()) {
682 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
683 return;
684 }
685 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
686
687 if (bond->igmp_retrans > 1) {
688 bond->igmp_retrans--;
689 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
690 }
691 rtnl_unlock();
692}
693
694/* Flush bond's hardware addresses from slave */
695static void bond_hw_addr_flush(struct net_device *bond_dev,
696 struct net_device *slave_dev)
697{
698 struct bonding *bond = netdev_priv(bond_dev);
699
700 dev_uc_unsync(slave_dev, bond_dev);
701 dev_mc_unsync(slave_dev, bond_dev);
702
703 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
704 /* del lacpdu mc addr from mc list */
705 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
706
707 dev_mc_del(slave_dev, lacpdu_multicast);
708 }
709}
710
711/*--------------------------- Active slave change ---------------------------*/
712
713/* Update the hardware address list and promisc/allmulti for the new and
714 * old active slaves (if any). Modes that are not using primary keep all
715 * slaves up date at all times; only the modes that use primary need to call
716 * this function to swap these settings during a failover.
717 */
718static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
719 struct slave *old_active)
720{
721 if (old_active) {
722 if (bond->dev->flags & IFF_PROMISC)
723 dev_set_promiscuity(old_active->dev, -1);
724
725 if (bond->dev->flags & IFF_ALLMULTI)
726 dev_set_allmulti(old_active->dev, -1);
727
728 bond_hw_addr_flush(bond->dev, old_active->dev);
729 }
730
731 if (new_active) {
732 /* FIXME: Signal errors upstream. */
733 if (bond->dev->flags & IFF_PROMISC)
734 dev_set_promiscuity(new_active->dev, 1);
735
736 if (bond->dev->flags & IFF_ALLMULTI)
737 dev_set_allmulti(new_active->dev, 1);
738
739 netif_addr_lock_bh(bond->dev);
740 dev_uc_sync(new_active->dev, bond->dev);
741 dev_mc_sync(new_active->dev, bond->dev);
742 netif_addr_unlock_bh(bond->dev);
743 }
744}
745
746/**
747 * bond_set_dev_addr - clone slave's address to bond
748 * @bond_dev: bond net device
749 * @slave_dev: slave net device
750 *
751 * Should be called with RTNL held.
752 */
753static int bond_set_dev_addr(struct net_device *bond_dev,
754 struct net_device *slave_dev)
755{
756 int err;
757
758 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
759 bond_dev, slave_dev, slave_dev->addr_len);
760 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
761 if (err)
762 return err;
763
764 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
765 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
766 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
767 return 0;
768}
769
770static struct slave *bond_get_old_active(struct bonding *bond,
771 struct slave *new_active)
772{
773 struct slave *slave;
774 struct list_head *iter;
775
776 bond_for_each_slave(bond, slave, iter) {
777 if (slave == new_active)
778 continue;
779
780 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
781 return slave;
782 }
783
784 return NULL;
785}
786
787/* bond_do_fail_over_mac
788 *
789 * Perform special MAC address swapping for fail_over_mac settings
790 *
791 * Called with RTNL
792 */
793static void bond_do_fail_over_mac(struct bonding *bond,
794 struct slave *new_active,
795 struct slave *old_active)
796{
797 u8 tmp_mac[MAX_ADDR_LEN];
798 struct sockaddr_storage ss;
799 int rv;
800
801 switch (bond->params.fail_over_mac) {
802 case BOND_FOM_ACTIVE:
803 if (new_active) {
804 rv = bond_set_dev_addr(bond->dev, new_active->dev);
805 if (rv)
806 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
807 -rv);
808 }
809 break;
810 case BOND_FOM_FOLLOW:
811 /* if new_active && old_active, swap them
812 * if just old_active, do nothing (going to no active slave)
813 * if just new_active, set new_active to bond's MAC
814 */
815 if (!new_active)
816 return;
817
818 if (!old_active)
819 old_active = bond_get_old_active(bond, new_active);
820
821 if (old_active) {
822 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
823 new_active->dev->addr_len);
824 bond_hw_addr_copy(ss.__data,
825 old_active->dev->dev_addr,
826 old_active->dev->addr_len);
827 ss.ss_family = new_active->dev->type;
828 } else {
829 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
830 bond->dev->addr_len);
831 ss.ss_family = bond->dev->type;
832 }
833
834 rv = dev_set_mac_address(new_active->dev,
835 (struct sockaddr *)&ss, NULL);
836 if (rv) {
837 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
838 -rv);
839 goto out;
840 }
841
842 if (!old_active)
843 goto out;
844
845 bond_hw_addr_copy(ss.__data, tmp_mac,
846 new_active->dev->addr_len);
847 ss.ss_family = old_active->dev->type;
848
849 rv = dev_set_mac_address(old_active->dev,
850 (struct sockaddr *)&ss, NULL);
851 if (rv)
852 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
853 -rv);
854out:
855 break;
856 default:
857 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
858 bond->params.fail_over_mac);
859 break;
860 }
861
862}
863
864static struct slave *bond_choose_primary_or_current(struct bonding *bond)
865{
866 struct slave *prim = rtnl_dereference(bond->primary_slave);
867 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
868
869 if (!prim || prim->link != BOND_LINK_UP) {
870 if (!curr || curr->link != BOND_LINK_UP)
871 return NULL;
872 return curr;
873 }
874
875 if (bond->force_primary) {
876 bond->force_primary = false;
877 return prim;
878 }
879
880 if (!curr || curr->link != BOND_LINK_UP)
881 return prim;
882
883 /* At this point, prim and curr are both up */
884 switch (bond->params.primary_reselect) {
885 case BOND_PRI_RESELECT_ALWAYS:
886 return prim;
887 case BOND_PRI_RESELECT_BETTER:
888 if (prim->speed < curr->speed)
889 return curr;
890 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
891 return curr;
892 return prim;
893 case BOND_PRI_RESELECT_FAILURE:
894 return curr;
895 default:
896 netdev_err(bond->dev, "impossible primary_reselect %d\n",
897 bond->params.primary_reselect);
898 return curr;
899 }
900}
901
902/**
903 * bond_find_best_slave - select the best available slave to be the active one
904 * @bond: our bonding struct
905 */
906static struct slave *bond_find_best_slave(struct bonding *bond)
907{
908 struct slave *slave, *bestslave = NULL;
909 struct list_head *iter;
910 int mintime = bond->params.updelay;
911
912 slave = bond_choose_primary_or_current(bond);
913 if (slave)
914 return slave;
915
916 bond_for_each_slave(bond, slave, iter) {
917 if (slave->link == BOND_LINK_UP)
918 return slave;
919 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
920 slave->delay < mintime) {
921 mintime = slave->delay;
922 bestslave = slave;
923 }
924 }
925
926 return bestslave;
927}
928
929static bool bond_should_notify_peers(struct bonding *bond)
930{
931 struct slave *slave;
932
933 rcu_read_lock();
934 slave = rcu_dereference(bond->curr_active_slave);
935 rcu_read_unlock();
936
937 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
938 slave ? slave->dev->name : "NULL");
939
940 if (!slave || !bond->send_peer_notif ||
941 bond->send_peer_notif %
942 max(1, bond->params.peer_notif_delay) != 0 ||
943 !netif_carrier_ok(bond->dev) ||
944 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
945 return false;
946
947 return true;
948}
949
950/**
951 * change_active_interface - change the active slave into the specified one
952 * @bond: our bonding struct
953 * @new_active: the new slave to make the active one
954 *
955 * Set the new slave to the bond's settings and unset them on the old
956 * curr_active_slave.
957 * Setting include flags, mc-list, promiscuity, allmulti, etc.
958 *
959 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
960 * because it is apparently the best available slave we have, even though its
961 * updelay hasn't timed out yet.
962 *
963 * Caller must hold RTNL.
964 */
965void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
966{
967 struct slave *old_active;
968
969 ASSERT_RTNL();
970
971 old_active = rtnl_dereference(bond->curr_active_slave);
972
973 if (old_active == new_active)
974 return;
975
976#ifdef CONFIG_XFRM_OFFLOAD
977 if (old_active && bond->xs)
978 bond_ipsec_del_sa(bond->xs);
979#endif /* CONFIG_XFRM_OFFLOAD */
980
981 if (new_active) {
982 new_active->last_link_up = jiffies;
983
984 if (new_active->link == BOND_LINK_BACK) {
985 if (bond_uses_primary(bond)) {
986 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
987 (bond->params.updelay - new_active->delay) * bond->params.miimon);
988 }
989
990 new_active->delay = 0;
991 bond_set_slave_link_state(new_active, BOND_LINK_UP,
992 BOND_SLAVE_NOTIFY_NOW);
993
994 if (BOND_MODE(bond) == BOND_MODE_8023AD)
995 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
996
997 if (bond_is_lb(bond))
998 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
999 } else {
1000 if (bond_uses_primary(bond)) {
1001 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1002 }
1003 }
1004 }
1005
1006 if (bond_uses_primary(bond))
1007 bond_hw_addr_swap(bond, new_active, old_active);
1008
1009 if (bond_is_lb(bond)) {
1010 bond_alb_handle_active_change(bond, new_active);
1011 if (old_active)
1012 bond_set_slave_inactive_flags(old_active,
1013 BOND_SLAVE_NOTIFY_NOW);
1014 if (new_active)
1015 bond_set_slave_active_flags(new_active,
1016 BOND_SLAVE_NOTIFY_NOW);
1017 } else {
1018 rcu_assign_pointer(bond->curr_active_slave, new_active);
1019 }
1020
1021 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1022 if (old_active)
1023 bond_set_slave_inactive_flags(old_active,
1024 BOND_SLAVE_NOTIFY_NOW);
1025
1026 if (new_active) {
1027 bool should_notify_peers = false;
1028
1029 bond_set_slave_active_flags(new_active,
1030 BOND_SLAVE_NOTIFY_NOW);
1031
1032 if (bond->params.fail_over_mac)
1033 bond_do_fail_over_mac(bond, new_active,
1034 old_active);
1035
1036 if (netif_running(bond->dev)) {
1037 bond->send_peer_notif =
1038 bond->params.num_peer_notif *
1039 max(1, bond->params.peer_notif_delay);
1040 should_notify_peers =
1041 bond_should_notify_peers(bond);
1042 }
1043
1044 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1045 if (should_notify_peers) {
1046 bond->send_peer_notif--;
1047 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1048 bond->dev);
1049 }
1050 }
1051 }
1052
1053#ifdef CONFIG_XFRM_OFFLOAD
1054 if (new_active && bond->xs) {
1055 xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1056 bond_ipsec_add_sa(bond->xs);
1057 }
1058#endif /* CONFIG_XFRM_OFFLOAD */
1059
1060 /* resend IGMP joins since active slave has changed or
1061 * all were sent on curr_active_slave.
1062 * resend only if bond is brought up with the affected
1063 * bonding modes and the retransmission is enabled
1064 */
1065 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1066 ((bond_uses_primary(bond) && new_active) ||
1067 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1068 bond->igmp_retrans = bond->params.resend_igmp;
1069 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1070 }
1071}
1072
1073/**
1074 * bond_select_active_slave - select a new active slave, if needed
1075 * @bond: our bonding struct
1076 *
1077 * This functions should be called when one of the following occurs:
1078 * - The old curr_active_slave has been released or lost its link.
1079 * - The primary_slave has got its link back.
1080 * - A slave has got its link back and there's no old curr_active_slave.
1081 *
1082 * Caller must hold RTNL.
1083 */
1084void bond_select_active_slave(struct bonding *bond)
1085{
1086 struct slave *best_slave;
1087 int rv;
1088
1089 ASSERT_RTNL();
1090
1091 best_slave = bond_find_best_slave(bond);
1092 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1093 bond_change_active_slave(bond, best_slave);
1094 rv = bond_set_carrier(bond);
1095 if (!rv)
1096 return;
1097
1098 if (netif_carrier_ok(bond->dev))
1099 netdev_info(bond->dev, "active interface up!\n");
1100 else
1101 netdev_info(bond->dev, "now running without any active interface!\n");
1102 }
1103}
1104
1105#ifdef CONFIG_NET_POLL_CONTROLLER
1106static inline int slave_enable_netpoll(struct slave *slave)
1107{
1108 struct netpoll *np;
1109 int err = 0;
1110
1111 np = kzalloc(sizeof(*np), GFP_KERNEL);
1112 err = -ENOMEM;
1113 if (!np)
1114 goto out;
1115
1116 err = __netpoll_setup(np, slave->dev);
1117 if (err) {
1118 kfree(np);
1119 goto out;
1120 }
1121 slave->np = np;
1122out:
1123 return err;
1124}
1125static inline void slave_disable_netpoll(struct slave *slave)
1126{
1127 struct netpoll *np = slave->np;
1128
1129 if (!np)
1130 return;
1131
1132 slave->np = NULL;
1133
1134 __netpoll_free(np);
1135}
1136
1137static void bond_poll_controller(struct net_device *bond_dev)
1138{
1139 struct bonding *bond = netdev_priv(bond_dev);
1140 struct slave *slave = NULL;
1141 struct list_head *iter;
1142 struct ad_info ad_info;
1143
1144 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1145 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1146 return;
1147
1148 bond_for_each_slave_rcu(bond, slave, iter) {
1149 if (!bond_slave_is_up(slave))
1150 continue;
1151
1152 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1153 struct aggregator *agg =
1154 SLAVE_AD_INFO(slave)->port.aggregator;
1155
1156 if (agg &&
1157 agg->aggregator_identifier != ad_info.aggregator_id)
1158 continue;
1159 }
1160
1161 netpoll_poll_dev(slave->dev);
1162 }
1163}
1164
1165static void bond_netpoll_cleanup(struct net_device *bond_dev)
1166{
1167 struct bonding *bond = netdev_priv(bond_dev);
1168 struct list_head *iter;
1169 struct slave *slave;
1170
1171 bond_for_each_slave(bond, slave, iter)
1172 if (bond_slave_is_up(slave))
1173 slave_disable_netpoll(slave);
1174}
1175
1176static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1177{
1178 struct bonding *bond = netdev_priv(dev);
1179 struct list_head *iter;
1180 struct slave *slave;
1181 int err = 0;
1182
1183 bond_for_each_slave(bond, slave, iter) {
1184 err = slave_enable_netpoll(slave);
1185 if (err) {
1186 bond_netpoll_cleanup(dev);
1187 break;
1188 }
1189 }
1190 return err;
1191}
1192#else
1193static inline int slave_enable_netpoll(struct slave *slave)
1194{
1195 return 0;
1196}
1197static inline void slave_disable_netpoll(struct slave *slave)
1198{
1199}
1200static void bond_netpoll_cleanup(struct net_device *bond_dev)
1201{
1202}
1203#endif
1204
1205/*---------------------------------- IOCTL ----------------------------------*/
1206
1207static netdev_features_t bond_fix_features(struct net_device *dev,
1208 netdev_features_t features)
1209{
1210 struct bonding *bond = netdev_priv(dev);
1211 struct list_head *iter;
1212 netdev_features_t mask;
1213 struct slave *slave;
1214
1215 mask = features;
1216
1217 features &= ~NETIF_F_ONE_FOR_ALL;
1218 features |= NETIF_F_ALL_FOR_ALL;
1219
1220 bond_for_each_slave(bond, slave, iter) {
1221 features = netdev_increment_features(features,
1222 slave->dev->features,
1223 mask);
1224 }
1225 features = netdev_add_tso_features(features, mask);
1226
1227 return features;
1228}
1229
1230#define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1231 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1232 NETIF_F_HIGHDMA | NETIF_F_LRO)
1233
1234#define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1235 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1236
1237#define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1238 NETIF_F_ALL_TSO)
1239
1240
1241static void bond_compute_features(struct bonding *bond)
1242{
1243 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1244 IFF_XMIT_DST_RELEASE_PERM;
1245 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1246 netdev_features_t enc_features = BOND_ENC_FEATURES;
1247#ifdef CONFIG_XFRM_OFFLOAD
1248 netdev_features_t xfrm_features = BOND_XFRM_FEATURES;
1249#endif /* CONFIG_XFRM_OFFLOAD */
1250 netdev_features_t mpls_features = BOND_MPLS_FEATURES;
1251 struct net_device *bond_dev = bond->dev;
1252 struct list_head *iter;
1253 struct slave *slave;
1254 unsigned short max_hard_header_len = ETH_HLEN;
1255 unsigned int gso_max_size = GSO_MAX_SIZE;
1256 u16 gso_max_segs = GSO_MAX_SEGS;
1257
1258 if (!bond_has_slaves(bond))
1259 goto done;
1260 vlan_features &= NETIF_F_ALL_FOR_ALL;
1261 mpls_features &= NETIF_F_ALL_FOR_ALL;
1262
1263 bond_for_each_slave(bond, slave, iter) {
1264 vlan_features = netdev_increment_features(vlan_features,
1265 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1266
1267 enc_features = netdev_increment_features(enc_features,
1268 slave->dev->hw_enc_features,
1269 BOND_ENC_FEATURES);
1270
1271#ifdef CONFIG_XFRM_OFFLOAD
1272 xfrm_features = netdev_increment_features(xfrm_features,
1273 slave->dev->hw_enc_features,
1274 BOND_XFRM_FEATURES);
1275#endif /* CONFIG_XFRM_OFFLOAD */
1276
1277 mpls_features = netdev_increment_features(mpls_features,
1278 slave->dev->mpls_features,
1279 BOND_MPLS_FEATURES);
1280
1281 dst_release_flag &= slave->dev->priv_flags;
1282 if (slave->dev->hard_header_len > max_hard_header_len)
1283 max_hard_header_len = slave->dev->hard_header_len;
1284
1285 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1286 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1287 }
1288 bond_dev->hard_header_len = max_hard_header_len;
1289
1290done:
1291 bond_dev->vlan_features = vlan_features;
1292 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1293 NETIF_F_HW_VLAN_CTAG_TX |
1294 NETIF_F_HW_VLAN_STAG_TX |
1295 NETIF_F_GSO_UDP_L4;
1296#ifdef CONFIG_XFRM_OFFLOAD
1297 bond_dev->hw_enc_features |= xfrm_features;
1298#endif /* CONFIG_XFRM_OFFLOAD */
1299 bond_dev->mpls_features = mpls_features;
1300 bond_dev->gso_max_segs = gso_max_segs;
1301 netif_set_gso_max_size(bond_dev, gso_max_size);
1302
1303 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1304 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1305 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1306 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1307
1308 netdev_change_features(bond_dev);
1309}
1310
1311static void bond_setup_by_slave(struct net_device *bond_dev,
1312 struct net_device *slave_dev)
1313{
1314 bond_dev->header_ops = slave_dev->header_ops;
1315
1316 bond_dev->type = slave_dev->type;
1317 bond_dev->hard_header_len = slave_dev->hard_header_len;
1318 bond_dev->needed_headroom = slave_dev->needed_headroom;
1319 bond_dev->addr_len = slave_dev->addr_len;
1320
1321 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1322 slave_dev->addr_len);
1323}
1324
1325/* On bonding slaves other than the currently active slave, suppress
1326 * duplicates except for alb non-mcast/bcast.
1327 */
1328static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1329 struct slave *slave,
1330 struct bonding *bond)
1331{
1332 if (bond_is_slave_inactive(slave)) {
1333 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1334 skb->pkt_type != PACKET_BROADCAST &&
1335 skb->pkt_type != PACKET_MULTICAST)
1336 return false;
1337 return true;
1338 }
1339 return false;
1340}
1341
1342static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1343{
1344 struct sk_buff *skb = *pskb;
1345 struct slave *slave;
1346 struct bonding *bond;
1347 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1348 struct slave *);
1349 int ret = RX_HANDLER_ANOTHER;
1350
1351 skb = skb_share_check(skb, GFP_ATOMIC);
1352 if (unlikely(!skb))
1353 return RX_HANDLER_CONSUMED;
1354
1355 *pskb = skb;
1356
1357 slave = bond_slave_get_rcu(skb->dev);
1358 bond = slave->bond;
1359
1360 recv_probe = READ_ONCE(bond->recv_probe);
1361 if (recv_probe) {
1362 ret = recv_probe(skb, bond, slave);
1363 if (ret == RX_HANDLER_CONSUMED) {
1364 consume_skb(skb);
1365 return ret;
1366 }
1367 }
1368
1369 /*
1370 * For packets determined by bond_should_deliver_exact_match() call to
1371 * be suppressed we want to make an exception for link-local packets.
1372 * This is necessary for e.g. LLDP daemons to be able to monitor
1373 * inactive slave links without being forced to bind to them
1374 * explicitly.
1375 *
1376 * At the same time, packets that are passed to the bonding master
1377 * (including link-local ones) can have their originating interface
1378 * determined via PACKET_ORIGDEV socket option.
1379 */
1380 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1381 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1382 return RX_HANDLER_PASS;
1383 return RX_HANDLER_EXACT;
1384 }
1385
1386 skb->dev = bond->dev;
1387
1388 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1389 netif_is_bridge_port(bond->dev) &&
1390 skb->pkt_type == PACKET_HOST) {
1391
1392 if (unlikely(skb_cow_head(skb,
1393 skb->data - skb_mac_header(skb)))) {
1394 kfree_skb(skb);
1395 return RX_HANDLER_CONSUMED;
1396 }
1397 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1398 bond->dev->addr_len);
1399 }
1400
1401 return ret;
1402}
1403
1404static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1405{
1406 switch (BOND_MODE(bond)) {
1407 case BOND_MODE_ROUNDROBIN:
1408 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1409 case BOND_MODE_ACTIVEBACKUP:
1410 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1411 case BOND_MODE_BROADCAST:
1412 return NETDEV_LAG_TX_TYPE_BROADCAST;
1413 case BOND_MODE_XOR:
1414 case BOND_MODE_8023AD:
1415 return NETDEV_LAG_TX_TYPE_HASH;
1416 default:
1417 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1418 }
1419}
1420
1421static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1422 enum netdev_lag_tx_type type)
1423{
1424 if (type != NETDEV_LAG_TX_TYPE_HASH)
1425 return NETDEV_LAG_HASH_NONE;
1426
1427 switch (bond->params.xmit_policy) {
1428 case BOND_XMIT_POLICY_LAYER2:
1429 return NETDEV_LAG_HASH_L2;
1430 case BOND_XMIT_POLICY_LAYER34:
1431 return NETDEV_LAG_HASH_L34;
1432 case BOND_XMIT_POLICY_LAYER23:
1433 return NETDEV_LAG_HASH_L23;
1434 case BOND_XMIT_POLICY_ENCAP23:
1435 return NETDEV_LAG_HASH_E23;
1436 case BOND_XMIT_POLICY_ENCAP34:
1437 return NETDEV_LAG_HASH_E34;
1438 default:
1439 return NETDEV_LAG_HASH_UNKNOWN;
1440 }
1441}
1442
1443static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1444 struct netlink_ext_ack *extack)
1445{
1446 struct netdev_lag_upper_info lag_upper_info;
1447 enum netdev_lag_tx_type type;
1448
1449 type = bond_lag_tx_type(bond);
1450 lag_upper_info.tx_type = type;
1451 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1452
1453 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1454 &lag_upper_info, extack);
1455}
1456
1457static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1458{
1459 netdev_upper_dev_unlink(slave->dev, bond->dev);
1460 slave->dev->flags &= ~IFF_SLAVE;
1461}
1462
1463static struct slave *bond_alloc_slave(struct bonding *bond)
1464{
1465 struct slave *slave = NULL;
1466
1467 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1468 if (!slave)
1469 return NULL;
1470
1471 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1472 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1473 GFP_KERNEL);
1474 if (!SLAVE_AD_INFO(slave)) {
1475 kfree(slave);
1476 return NULL;
1477 }
1478 }
1479 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1480
1481 return slave;
1482}
1483
1484static void bond_free_slave(struct slave *slave)
1485{
1486 struct bonding *bond = bond_get_bond_by_slave(slave);
1487
1488 cancel_delayed_work_sync(&slave->notify_work);
1489 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1490 kfree(SLAVE_AD_INFO(slave));
1491
1492 kfree(slave);
1493}
1494
1495static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1496{
1497 info->bond_mode = BOND_MODE(bond);
1498 info->miimon = bond->params.miimon;
1499 info->num_slaves = bond->slave_cnt;
1500}
1501
1502static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1503{
1504 strcpy(info->slave_name, slave->dev->name);
1505 info->link = slave->link;
1506 info->state = bond_slave_state(slave);
1507 info->link_failure_count = slave->link_failure_count;
1508}
1509
1510static void bond_netdev_notify_work(struct work_struct *_work)
1511{
1512 struct slave *slave = container_of(_work, struct slave,
1513 notify_work.work);
1514
1515 if (rtnl_trylock()) {
1516 struct netdev_bonding_info binfo;
1517
1518 bond_fill_ifslave(slave, &binfo.slave);
1519 bond_fill_ifbond(slave->bond, &binfo.master);
1520 netdev_bonding_info_change(slave->dev, &binfo);
1521 rtnl_unlock();
1522 } else {
1523 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1524 }
1525}
1526
1527void bond_queue_slave_event(struct slave *slave)
1528{
1529 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1530}
1531
1532void bond_lower_state_changed(struct slave *slave)
1533{
1534 struct netdev_lag_lower_state_info info;
1535
1536 info.link_up = slave->link == BOND_LINK_UP ||
1537 slave->link == BOND_LINK_FAIL;
1538 info.tx_enabled = bond_is_active_slave(slave);
1539 netdev_lower_state_changed(slave->dev, &info);
1540}
1541
1542/* enslave device <slave> to bond device <master> */
1543int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1544 struct netlink_ext_ack *extack)
1545{
1546 struct bonding *bond = netdev_priv(bond_dev);
1547 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1548 struct slave *new_slave = NULL, *prev_slave;
1549 struct sockaddr_storage ss;
1550 int link_reporting;
1551 int res = 0, i;
1552
1553 if (!bond->params.use_carrier &&
1554 slave_dev->ethtool_ops->get_link == NULL &&
1555 slave_ops->ndo_do_ioctl == NULL) {
1556 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1557 }
1558
1559 /* already in-use? */
1560 if (netdev_is_rx_handler_busy(slave_dev)) {
1561 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1562 slave_err(bond_dev, slave_dev,
1563 "Error: Device is in use and cannot be enslaved\n");
1564 return -EBUSY;
1565 }
1566
1567 if (bond_dev == slave_dev) {
1568 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1569 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1570 return -EPERM;
1571 }
1572
1573 /* vlan challenged mutual exclusion */
1574 /* no need to lock since we're protected by rtnl_lock */
1575 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1576 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1577 if (vlan_uses_dev(bond_dev)) {
1578 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1579 slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1580 return -EPERM;
1581 } else {
1582 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1583 }
1584 } else {
1585 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1586 }
1587
1588 if (slave_dev->features & NETIF_F_HW_ESP)
1589 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1590
1591 /* Old ifenslave binaries are no longer supported. These can
1592 * be identified with moderate accuracy by the state of the slave:
1593 * the current ifenslave will set the interface down prior to
1594 * enslaving it; the old ifenslave will not.
1595 */
1596 if (slave_dev->flags & IFF_UP) {
1597 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1598 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1599 return -EPERM;
1600 }
1601
1602 /* set bonding device ether type by slave - bonding netdevices are
1603 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1604 * there is a need to override some of the type dependent attribs/funcs.
1605 *
1606 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1607 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1608 */
1609 if (!bond_has_slaves(bond)) {
1610 if (bond_dev->type != slave_dev->type) {
1611 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1612 bond_dev->type, slave_dev->type);
1613
1614 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1615 bond_dev);
1616 res = notifier_to_errno(res);
1617 if (res) {
1618 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1619 return -EBUSY;
1620 }
1621
1622 /* Flush unicast and multicast addresses */
1623 dev_uc_flush(bond_dev);
1624 dev_mc_flush(bond_dev);
1625
1626 if (slave_dev->type != ARPHRD_ETHER)
1627 bond_setup_by_slave(bond_dev, slave_dev);
1628 else {
1629 ether_setup(bond_dev);
1630 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1631 }
1632
1633 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1634 bond_dev);
1635 }
1636 } else if (bond_dev->type != slave_dev->type) {
1637 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1638 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1639 slave_dev->type, bond_dev->type);
1640 return -EINVAL;
1641 }
1642
1643 if (slave_dev->type == ARPHRD_INFINIBAND &&
1644 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1645 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1646 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1647 slave_dev->type);
1648 res = -EOPNOTSUPP;
1649 goto err_undo_flags;
1650 }
1651
1652 if (!slave_ops->ndo_set_mac_address ||
1653 slave_dev->type == ARPHRD_INFINIBAND) {
1654 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1655 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1656 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1657 if (!bond_has_slaves(bond)) {
1658 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1659 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1660 } else {
1661 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1662 slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1663 res = -EOPNOTSUPP;
1664 goto err_undo_flags;
1665 }
1666 }
1667 }
1668
1669 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1670
1671 /* If this is the first slave, then we need to set the master's hardware
1672 * address to be the same as the slave's.
1673 */
1674 if (!bond_has_slaves(bond) &&
1675 bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1676 res = bond_set_dev_addr(bond->dev, slave_dev);
1677 if (res)
1678 goto err_undo_flags;
1679 }
1680
1681 new_slave = bond_alloc_slave(bond);
1682 if (!new_slave) {
1683 res = -ENOMEM;
1684 goto err_undo_flags;
1685 }
1686
1687 new_slave->bond = bond;
1688 new_slave->dev = slave_dev;
1689 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1690 * is set via sysfs or module option if desired.
1691 */
1692 new_slave->queue_id = 0;
1693
1694 /* Save slave's original mtu and then set it to match the bond */
1695 new_slave->original_mtu = slave_dev->mtu;
1696 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1697 if (res) {
1698 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1699 goto err_free;
1700 }
1701
1702 /* Save slave's original ("permanent") mac address for modes
1703 * that need it, and for restoring it upon release, and then
1704 * set it to the master's address
1705 */
1706 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1707 slave_dev->addr_len);
1708
1709 if (!bond->params.fail_over_mac ||
1710 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1711 /* Set slave to master's mac address. The application already
1712 * set the master's mac address to that of the first slave
1713 */
1714 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1715 ss.ss_family = slave_dev->type;
1716 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1717 extack);
1718 if (res) {
1719 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1720 goto err_restore_mtu;
1721 }
1722 }
1723
1724 /* set slave flag before open to prevent IPv6 addrconf */
1725 slave_dev->flags |= IFF_SLAVE;
1726
1727 /* open the slave since the application closed it */
1728 res = dev_open(slave_dev, extack);
1729 if (res) {
1730 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1731 goto err_restore_mac;
1732 }
1733
1734 slave_dev->priv_flags |= IFF_BONDING;
1735 /* initialize slave stats */
1736 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1737
1738 if (bond_is_lb(bond)) {
1739 /* bond_alb_init_slave() must be called before all other stages since
1740 * it might fail and we do not want to have to undo everything
1741 */
1742 res = bond_alb_init_slave(bond, new_slave);
1743 if (res)
1744 goto err_close;
1745 }
1746
1747 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1748 if (res) {
1749 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1750 goto err_close;
1751 }
1752
1753 prev_slave = bond_last_slave(bond);
1754
1755 new_slave->delay = 0;
1756 new_slave->link_failure_count = 0;
1757
1758 if (bond_update_speed_duplex(new_slave) &&
1759 bond_needs_speed_duplex(bond))
1760 new_slave->link = BOND_LINK_DOWN;
1761
1762 new_slave->last_rx = jiffies -
1763 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1764 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1765 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1766
1767 if (bond->params.miimon && !bond->params.use_carrier) {
1768 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1769
1770 if ((link_reporting == -1) && !bond->params.arp_interval) {
1771 /* miimon is set but a bonded network driver
1772 * does not support ETHTOOL/MII and
1773 * arp_interval is not set. Note: if
1774 * use_carrier is enabled, we will never go
1775 * here (because netif_carrier is always
1776 * supported); thus, we don't need to change
1777 * the messages for netif_carrier.
1778 */
1779 slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1780 } else if (link_reporting == -1) {
1781 /* unable get link status using mii/ethtool */
1782 slave_warn(bond_dev, slave_dev, "can't get link status from slave; 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");
1783 }
1784 }
1785
1786 /* check for initial state */
1787 new_slave->link = BOND_LINK_NOCHANGE;
1788 if (bond->params.miimon) {
1789 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1790 if (bond->params.updelay) {
1791 bond_set_slave_link_state(new_slave,
1792 BOND_LINK_BACK,
1793 BOND_SLAVE_NOTIFY_NOW);
1794 new_slave->delay = bond->params.updelay;
1795 } else {
1796 bond_set_slave_link_state(new_slave,
1797 BOND_LINK_UP,
1798 BOND_SLAVE_NOTIFY_NOW);
1799 }
1800 } else {
1801 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1802 BOND_SLAVE_NOTIFY_NOW);
1803 }
1804 } else if (bond->params.arp_interval) {
1805 bond_set_slave_link_state(new_slave,
1806 (netif_carrier_ok(slave_dev) ?
1807 BOND_LINK_UP : BOND_LINK_DOWN),
1808 BOND_SLAVE_NOTIFY_NOW);
1809 } else {
1810 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1811 BOND_SLAVE_NOTIFY_NOW);
1812 }
1813
1814 if (new_slave->link != BOND_LINK_DOWN)
1815 new_slave->last_link_up = jiffies;
1816 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1817 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1818 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1819
1820 if (bond_uses_primary(bond) && 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 rcu_assign_pointer(bond->primary_slave, new_slave);
1824 bond->force_primary = true;
1825 }
1826 }
1827
1828 switch (BOND_MODE(bond)) {
1829 case BOND_MODE_ACTIVEBACKUP:
1830 bond_set_slave_inactive_flags(new_slave,
1831 BOND_SLAVE_NOTIFY_NOW);
1832 break;
1833 case BOND_MODE_8023AD:
1834 /* in 802.3ad mode, the internal mechanism
1835 * will activate the slaves in the selected
1836 * aggregator
1837 */
1838 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1839 /* if this is the first slave */
1840 if (!prev_slave) {
1841 SLAVE_AD_INFO(new_slave)->id = 1;
1842 /* Initialize AD with the number of times that the AD timer is called in 1 second
1843 * can be called only after the mac address of the bond is set
1844 */
1845 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1846 } else {
1847 SLAVE_AD_INFO(new_slave)->id =
1848 SLAVE_AD_INFO(prev_slave)->id + 1;
1849 }
1850
1851 bond_3ad_bind_slave(new_slave);
1852 break;
1853 case BOND_MODE_TLB:
1854 case BOND_MODE_ALB:
1855 bond_set_active_slave(new_slave);
1856 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1857 break;
1858 default:
1859 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1860
1861 /* always active in trunk mode */
1862 bond_set_active_slave(new_slave);
1863
1864 /* In trunking mode there is little meaning to curr_active_slave
1865 * anyway (it holds no special properties of the bond device),
1866 * so we can change it without calling change_active_interface()
1867 */
1868 if (!rcu_access_pointer(bond->curr_active_slave) &&
1869 new_slave->link == BOND_LINK_UP)
1870 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1871
1872 break;
1873 } /* switch(bond_mode) */
1874
1875#ifdef CONFIG_NET_POLL_CONTROLLER
1876 if (bond->dev->npinfo) {
1877 if (slave_enable_netpoll(new_slave)) {
1878 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1879 res = -EBUSY;
1880 goto err_detach;
1881 }
1882 }
1883#endif
1884
1885 if (!(bond_dev->features & NETIF_F_LRO))
1886 dev_disable_lro(slave_dev);
1887
1888 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1889 new_slave);
1890 if (res) {
1891 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1892 goto err_detach;
1893 }
1894
1895 res = bond_master_upper_dev_link(bond, new_slave, extack);
1896 if (res) {
1897 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1898 goto err_unregister;
1899 }
1900
1901 res = bond_sysfs_slave_add(new_slave);
1902 if (res) {
1903 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1904 goto err_upper_unlink;
1905 }
1906
1907 /* If the mode uses primary, then the following is handled by
1908 * bond_change_active_slave().
1909 */
1910 if (!bond_uses_primary(bond)) {
1911 /* set promiscuity level to new slave */
1912 if (bond_dev->flags & IFF_PROMISC) {
1913 res = dev_set_promiscuity(slave_dev, 1);
1914 if (res)
1915 goto err_sysfs_del;
1916 }
1917
1918 /* set allmulti level to new slave */
1919 if (bond_dev->flags & IFF_ALLMULTI) {
1920 res = dev_set_allmulti(slave_dev, 1);
1921 if (res) {
1922 if (bond_dev->flags & IFF_PROMISC)
1923 dev_set_promiscuity(slave_dev, -1);
1924 goto err_sysfs_del;
1925 }
1926 }
1927
1928 netif_addr_lock_bh(bond_dev);
1929 dev_mc_sync_multiple(slave_dev, bond_dev);
1930 dev_uc_sync_multiple(slave_dev, bond_dev);
1931 netif_addr_unlock_bh(bond_dev);
1932
1933 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1934 /* add lacpdu mc addr to mc list */
1935 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1936
1937 dev_mc_add(slave_dev, lacpdu_multicast);
1938 }
1939 }
1940
1941 bond->slave_cnt++;
1942 bond_compute_features(bond);
1943 bond_set_carrier(bond);
1944
1945 if (bond_uses_primary(bond)) {
1946 block_netpoll_tx();
1947 bond_select_active_slave(bond);
1948 unblock_netpoll_tx();
1949 }
1950
1951 if (bond_mode_can_use_xmit_hash(bond))
1952 bond_update_slave_arr(bond, NULL);
1953
1954
1955 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1956 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1957 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1958
1959 /* enslave is successful */
1960 bond_queue_slave_event(new_slave);
1961 return 0;
1962
1963/* Undo stages on error */
1964err_sysfs_del:
1965 bond_sysfs_slave_del(new_slave);
1966
1967err_upper_unlink:
1968 bond_upper_dev_unlink(bond, new_slave);
1969
1970err_unregister:
1971 netdev_rx_handler_unregister(slave_dev);
1972
1973err_detach:
1974 vlan_vids_del_by_dev(slave_dev, bond_dev);
1975 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1976 RCU_INIT_POINTER(bond->primary_slave, NULL);
1977 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1978 block_netpoll_tx();
1979 bond_change_active_slave(bond, NULL);
1980 bond_select_active_slave(bond);
1981 unblock_netpoll_tx();
1982 }
1983 /* either primary_slave or curr_active_slave might've changed */
1984 synchronize_rcu();
1985 slave_disable_netpoll(new_slave);
1986
1987err_close:
1988 if (!netif_is_bond_master(slave_dev))
1989 slave_dev->priv_flags &= ~IFF_BONDING;
1990 dev_close(slave_dev);
1991
1992err_restore_mac:
1993 slave_dev->flags &= ~IFF_SLAVE;
1994 if (!bond->params.fail_over_mac ||
1995 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1996 /* XXX TODO - fom follow mode needs to change master's
1997 * MAC if this slave's MAC is in use by the bond, or at
1998 * least print a warning.
1999 */
2000 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2001 new_slave->dev->addr_len);
2002 ss.ss_family = slave_dev->type;
2003 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2004 }
2005
2006err_restore_mtu:
2007 dev_set_mtu(slave_dev, new_slave->original_mtu);
2008
2009err_free:
2010 bond_free_slave(new_slave);
2011
2012err_undo_flags:
2013 /* Enslave of first slave has failed and we need to fix master's mac */
2014 if (!bond_has_slaves(bond)) {
2015 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2016 slave_dev->dev_addr))
2017 eth_hw_addr_random(bond_dev);
2018 if (bond_dev->type != ARPHRD_ETHER) {
2019 dev_close(bond_dev);
2020 ether_setup(bond_dev);
2021 bond_dev->flags |= IFF_MASTER;
2022 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2023 }
2024 }
2025
2026 return res;
2027}
2028
2029/* Try to release the slave device <slave> from the bond device <master>
2030 * It is legal to access curr_active_slave without a lock because all the function
2031 * is RTNL-locked. If "all" is true it means that the function is being called
2032 * while destroying a bond interface and all slaves are being released.
2033 *
2034 * The rules for slave state should be:
2035 * for Active/Backup:
2036 * Active stays on all backups go down
2037 * for Bonded connections:
2038 * The first up interface should be left on and all others downed.
2039 */
2040static int __bond_release_one(struct net_device *bond_dev,
2041 struct net_device *slave_dev,
2042 bool all, bool unregister)
2043{
2044 struct bonding *bond = netdev_priv(bond_dev);
2045 struct slave *slave, *oldcurrent;
2046 struct sockaddr_storage ss;
2047 int old_flags = bond_dev->flags;
2048 netdev_features_t old_features = bond_dev->features;
2049
2050 /* slave is not a slave or master is not master of this slave */
2051 if (!(slave_dev->flags & IFF_SLAVE) ||
2052 !netdev_has_upper_dev(slave_dev, bond_dev)) {
2053 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2054 return -EINVAL;
2055 }
2056
2057 block_netpoll_tx();
2058
2059 slave = bond_get_slave_by_dev(bond, slave_dev);
2060 if (!slave) {
2061 /* not a slave of this bond */
2062 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2063 unblock_netpoll_tx();
2064 return -EINVAL;
2065 }
2066
2067 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2068
2069 bond_sysfs_slave_del(slave);
2070
2071 /* recompute stats just before removing the slave */
2072 bond_get_stats(bond->dev, &bond->bond_stats);
2073
2074 bond_upper_dev_unlink(bond, slave);
2075 /* unregister rx_handler early so bond_handle_frame wouldn't be called
2076 * for this slave anymore.
2077 */
2078 netdev_rx_handler_unregister(slave_dev);
2079
2080 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2081 bond_3ad_unbind_slave(slave);
2082
2083 if (bond_mode_can_use_xmit_hash(bond))
2084 bond_update_slave_arr(bond, slave);
2085
2086 slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2087 bond_is_active_slave(slave) ? "active" : "backup");
2088
2089 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2090
2091 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2092
2093 if (!all && (!bond->params.fail_over_mac ||
2094 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2095 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2096 bond_has_slaves(bond))
2097 slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
2098 slave->perm_hwaddr);
2099 }
2100
2101 if (rtnl_dereference(bond->primary_slave) == slave)
2102 RCU_INIT_POINTER(bond->primary_slave, NULL);
2103
2104 if (oldcurrent == slave)
2105 bond_change_active_slave(bond, NULL);
2106
2107 if (bond_is_lb(bond)) {
2108 /* Must be called only after the slave has been
2109 * detached from the list and the curr_active_slave
2110 * has been cleared (if our_slave == old_current),
2111 * but before a new active slave is selected.
2112 */
2113 bond_alb_deinit_slave(bond, slave);
2114 }
2115
2116 if (all) {
2117 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2118 } else if (oldcurrent == slave) {
2119 /* Note that we hold RTNL over this sequence, so there
2120 * is no concern that another slave add/remove event
2121 * will interfere.
2122 */
2123 bond_select_active_slave(bond);
2124 }
2125
2126 if (!bond_has_slaves(bond)) {
2127 bond_set_carrier(bond);
2128 eth_hw_addr_random(bond_dev);
2129 }
2130
2131 unblock_netpoll_tx();
2132 synchronize_rcu();
2133 bond->slave_cnt--;
2134
2135 if (!bond_has_slaves(bond)) {
2136 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2137 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2138 }
2139
2140 bond_compute_features(bond);
2141 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2142 (old_features & NETIF_F_VLAN_CHALLENGED))
2143 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2144
2145 vlan_vids_del_by_dev(slave_dev, bond_dev);
2146
2147 /* If the mode uses primary, then this case was handled above by
2148 * bond_change_active_slave(..., NULL)
2149 */
2150 if (!bond_uses_primary(bond)) {
2151 /* unset promiscuity level from slave
2152 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2153 * of the IFF_PROMISC flag in the bond_dev, but we need the
2154 * value of that flag before that change, as that was the value
2155 * when this slave was attached, so we cache at the start of the
2156 * function and use it here. Same goes for ALLMULTI below
2157 */
2158 if (old_flags & IFF_PROMISC)
2159 dev_set_promiscuity(slave_dev, -1);
2160
2161 /* unset allmulti level from slave */
2162 if (old_flags & IFF_ALLMULTI)
2163 dev_set_allmulti(slave_dev, -1);
2164
2165 bond_hw_addr_flush(bond_dev, slave_dev);
2166 }
2167
2168 slave_disable_netpoll(slave);
2169
2170 /* close slave before restoring its mac address */
2171 dev_close(slave_dev);
2172
2173 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2174 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2175 /* restore original ("permanent") mac address */
2176 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2177 slave->dev->addr_len);
2178 ss.ss_family = slave_dev->type;
2179 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2180 }
2181
2182 if (unregister)
2183 __dev_set_mtu(slave_dev, slave->original_mtu);
2184 else
2185 dev_set_mtu(slave_dev, slave->original_mtu);
2186
2187 if (!netif_is_bond_master(slave_dev))
2188 slave_dev->priv_flags &= ~IFF_BONDING;
2189
2190 bond_free_slave(slave);
2191
2192 return 0;
2193}
2194
2195/* A wrapper used because of ndo_del_link */
2196int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2197{
2198 return __bond_release_one(bond_dev, slave_dev, false, false);
2199}
2200
2201/* First release a slave and then destroy the bond if no more slaves are left.
2202 * Must be under rtnl_lock when this function is called.
2203 */
2204static int bond_release_and_destroy(struct net_device *bond_dev,
2205 struct net_device *slave_dev)
2206{
2207 struct bonding *bond = netdev_priv(bond_dev);
2208 int ret;
2209
2210 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2211 if (ret == 0 && !bond_has_slaves(bond) &&
2212 bond_dev->reg_state != NETREG_UNREGISTERING) {
2213 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2214 netdev_info(bond_dev, "Destroying bond\n");
2215 bond_remove_proc_entry(bond);
2216 unregister_netdevice(bond_dev);
2217 }
2218 return ret;
2219}
2220
2221static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2222{
2223 struct bonding *bond = netdev_priv(bond_dev);
2224 bond_fill_ifbond(bond, info);
2225}
2226
2227static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2228{
2229 struct bonding *bond = netdev_priv(bond_dev);
2230 struct list_head *iter;
2231 int i = 0, res = -ENODEV;
2232 struct slave *slave;
2233
2234 bond_for_each_slave(bond, slave, iter) {
2235 if (i++ == (int)info->slave_id) {
2236 res = 0;
2237 bond_fill_ifslave(slave, info);
2238 break;
2239 }
2240 }
2241
2242 return res;
2243}
2244
2245/*-------------------------------- Monitoring -------------------------------*/
2246
2247/* called with rcu_read_lock() */
2248static int bond_miimon_inspect(struct bonding *bond)
2249{
2250 int link_state, commit = 0;
2251 struct list_head *iter;
2252 struct slave *slave;
2253 bool ignore_updelay;
2254
2255 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2256
2257 bond_for_each_slave_rcu(bond, slave, iter) {
2258 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2259
2260 link_state = bond_check_dev_link(bond, slave->dev, 0);
2261
2262 switch (slave->link) {
2263 case BOND_LINK_UP:
2264 if (link_state)
2265 continue;
2266
2267 bond_propose_link_state(slave, BOND_LINK_FAIL);
2268 commit++;
2269 slave->delay = bond->params.downdelay;
2270 if (slave->delay) {
2271 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2272 (BOND_MODE(bond) ==
2273 BOND_MODE_ACTIVEBACKUP) ?
2274 (bond_is_active_slave(slave) ?
2275 "active " : "backup ") : "",
2276 bond->params.downdelay * bond->params.miimon);
2277 }
2278 fallthrough;
2279 case BOND_LINK_FAIL:
2280 if (link_state) {
2281 /* recovered before downdelay expired */
2282 bond_propose_link_state(slave, BOND_LINK_UP);
2283 slave->last_link_up = jiffies;
2284 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2285 (bond->params.downdelay - slave->delay) *
2286 bond->params.miimon);
2287 commit++;
2288 continue;
2289 }
2290
2291 if (slave->delay <= 0) {
2292 bond_propose_link_state(slave, BOND_LINK_DOWN);
2293 commit++;
2294 continue;
2295 }
2296
2297 slave->delay--;
2298 break;
2299
2300 case BOND_LINK_DOWN:
2301 if (!link_state)
2302 continue;
2303
2304 bond_propose_link_state(slave, BOND_LINK_BACK);
2305 commit++;
2306 slave->delay = bond->params.updelay;
2307
2308 if (slave->delay) {
2309 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2310 ignore_updelay ? 0 :
2311 bond->params.updelay *
2312 bond->params.miimon);
2313 }
2314 fallthrough;
2315 case BOND_LINK_BACK:
2316 if (!link_state) {
2317 bond_propose_link_state(slave, BOND_LINK_DOWN);
2318 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2319 (bond->params.updelay - slave->delay) *
2320 bond->params.miimon);
2321 commit++;
2322 continue;
2323 }
2324
2325 if (ignore_updelay)
2326 slave->delay = 0;
2327
2328 if (slave->delay <= 0) {
2329 bond_propose_link_state(slave, BOND_LINK_UP);
2330 commit++;
2331 ignore_updelay = false;
2332 continue;
2333 }
2334
2335 slave->delay--;
2336 break;
2337 }
2338 }
2339
2340 return commit;
2341}
2342
2343static void bond_miimon_link_change(struct bonding *bond,
2344 struct slave *slave,
2345 char link)
2346{
2347 switch (BOND_MODE(bond)) {
2348 case BOND_MODE_8023AD:
2349 bond_3ad_handle_link_change(slave, link);
2350 break;
2351 case BOND_MODE_TLB:
2352 case BOND_MODE_ALB:
2353 bond_alb_handle_link_change(bond, slave, link);
2354 break;
2355 case BOND_MODE_XOR:
2356 bond_update_slave_arr(bond, NULL);
2357 break;
2358 }
2359}
2360
2361static void bond_miimon_commit(struct bonding *bond)
2362{
2363 struct list_head *iter;
2364 struct slave *slave, *primary;
2365
2366 bond_for_each_slave(bond, slave, iter) {
2367 switch (slave->link_new_state) {
2368 case BOND_LINK_NOCHANGE:
2369 /* For 802.3ad mode, check current slave speed and
2370 * duplex again in case its port was disabled after
2371 * invalid speed/duplex reporting but recovered before
2372 * link monitoring could make a decision on the actual
2373 * link status
2374 */
2375 if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2376 slave->link == BOND_LINK_UP)
2377 bond_3ad_adapter_speed_duplex_changed(slave);
2378 continue;
2379
2380 case BOND_LINK_UP:
2381 if (bond_update_speed_duplex(slave) &&
2382 bond_needs_speed_duplex(bond)) {
2383 slave->link = BOND_LINK_DOWN;
2384 if (net_ratelimit())
2385 slave_warn(bond->dev, slave->dev,
2386 "failed to get link speed/duplex\n");
2387 continue;
2388 }
2389 bond_set_slave_link_state(slave, BOND_LINK_UP,
2390 BOND_SLAVE_NOTIFY_NOW);
2391 slave->last_link_up = jiffies;
2392
2393 primary = rtnl_dereference(bond->primary_slave);
2394 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2395 /* prevent it from being the active one */
2396 bond_set_backup_slave(slave);
2397 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2398 /* make it immediately active */
2399 bond_set_active_slave(slave);
2400 }
2401
2402 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2403 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2404 slave->duplex ? "full" : "half");
2405
2406 bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2407
2408 if (!bond->curr_active_slave || slave == primary)
2409 goto do_failover;
2410
2411 continue;
2412
2413 case BOND_LINK_DOWN:
2414 if (slave->link_failure_count < UINT_MAX)
2415 slave->link_failure_count++;
2416
2417 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2418 BOND_SLAVE_NOTIFY_NOW);
2419
2420 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2421 BOND_MODE(bond) == BOND_MODE_8023AD)
2422 bond_set_slave_inactive_flags(slave,
2423 BOND_SLAVE_NOTIFY_NOW);
2424
2425 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2426
2427 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2428
2429 if (slave == rcu_access_pointer(bond->curr_active_slave))
2430 goto do_failover;
2431
2432 continue;
2433
2434 default:
2435 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2436 slave->link_new_state);
2437 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2438
2439 continue;
2440 }
2441
2442do_failover:
2443 block_netpoll_tx();
2444 bond_select_active_slave(bond);
2445 unblock_netpoll_tx();
2446 }
2447
2448 bond_set_carrier(bond);
2449}
2450
2451/* bond_mii_monitor
2452 *
2453 * Really a wrapper that splits the mii monitor into two phases: an
2454 * inspection, then (if inspection indicates something needs to be done)
2455 * an acquisition of appropriate locks followed by a commit phase to
2456 * implement whatever link state changes are indicated.
2457 */
2458static void bond_mii_monitor(struct work_struct *work)
2459{
2460 struct bonding *bond = container_of(work, struct bonding,
2461 mii_work.work);
2462 bool should_notify_peers = false;
2463 bool commit;
2464 unsigned long delay;
2465 struct slave *slave;
2466 struct list_head *iter;
2467
2468 delay = msecs_to_jiffies(bond->params.miimon);
2469
2470 if (!bond_has_slaves(bond))
2471 goto re_arm;
2472
2473 rcu_read_lock();
2474 should_notify_peers = bond_should_notify_peers(bond);
2475 commit = !!bond_miimon_inspect(bond);
2476 if (bond->send_peer_notif) {
2477 rcu_read_unlock();
2478 if (rtnl_trylock()) {
2479 bond->send_peer_notif--;
2480 rtnl_unlock();
2481 }
2482 } else {
2483 rcu_read_unlock();
2484 }
2485
2486 if (commit) {
2487 /* Race avoidance with bond_close cancel of workqueue */
2488 if (!rtnl_trylock()) {
2489 delay = 1;
2490 should_notify_peers = false;
2491 goto re_arm;
2492 }
2493
2494 bond_for_each_slave(bond, slave, iter) {
2495 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2496 }
2497 bond_miimon_commit(bond);
2498
2499 rtnl_unlock(); /* might sleep, hold no other locks */
2500 }
2501
2502re_arm:
2503 if (bond->params.miimon)
2504 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2505
2506 if (should_notify_peers) {
2507 if (!rtnl_trylock())
2508 return;
2509 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2510 rtnl_unlock();
2511 }
2512}
2513
2514static int bond_upper_dev_walk(struct net_device *upper,
2515 struct netdev_nested_priv *priv)
2516{
2517 __be32 ip = *(__be32 *)priv->data;
2518
2519 return ip == bond_confirm_addr(upper, 0, ip);
2520}
2521
2522static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2523{
2524 struct netdev_nested_priv priv = {
2525 .data = (void *)&ip,
2526 };
2527 bool ret = false;
2528
2529 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2530 return true;
2531
2532 rcu_read_lock();
2533 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2534 ret = true;
2535 rcu_read_unlock();
2536
2537 return ret;
2538}
2539
2540/* We go to the (large) trouble of VLAN tagging ARP frames because
2541 * switches in VLAN mode (especially if ports are configured as
2542 * "native" to a VLAN) might not pass non-tagged frames.
2543 */
2544static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2545 __be32 src_ip, struct bond_vlan_tag *tags)
2546{
2547 struct sk_buff *skb;
2548 struct bond_vlan_tag *outer_tag = tags;
2549 struct net_device *slave_dev = slave->dev;
2550 struct net_device *bond_dev = slave->bond->dev;
2551
2552 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2553 arp_op, &dest_ip, &src_ip);
2554
2555 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2556 NULL, slave_dev->dev_addr, NULL);
2557
2558 if (!skb) {
2559 net_err_ratelimited("ARP packet allocation failed\n");
2560 return;
2561 }
2562
2563 if (!tags || tags->vlan_proto == VLAN_N_VID)
2564 goto xmit;
2565
2566 tags++;
2567
2568 /* Go through all the tags backwards and add them to the packet */
2569 while (tags->vlan_proto != VLAN_N_VID) {
2570 if (!tags->vlan_id) {
2571 tags++;
2572 continue;
2573 }
2574
2575 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2576 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2577 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2578 tags->vlan_id);
2579 if (!skb) {
2580 net_err_ratelimited("failed to insert inner VLAN tag\n");
2581 return;
2582 }
2583
2584 tags++;
2585 }
2586 /* Set the outer tag */
2587 if (outer_tag->vlan_id) {
2588 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2589 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2590 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2591 outer_tag->vlan_id);
2592 }
2593
2594xmit:
2595 arp_xmit(skb);
2596}
2597
2598/* Validate the device path between the @start_dev and the @end_dev.
2599 * The path is valid if the @end_dev is reachable through device
2600 * stacking.
2601 * When the path is validated, collect any vlan information in the
2602 * path.
2603 */
2604struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2605 struct net_device *end_dev,
2606 int level)
2607{
2608 struct bond_vlan_tag *tags;
2609 struct net_device *upper;
2610 struct list_head *iter;
2611
2612 if (start_dev == end_dev) {
2613 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2614 if (!tags)
2615 return ERR_PTR(-ENOMEM);
2616 tags[level].vlan_proto = VLAN_N_VID;
2617 return tags;
2618 }
2619
2620 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2621 tags = bond_verify_device_path(upper, end_dev, level + 1);
2622 if (IS_ERR_OR_NULL(tags)) {
2623 if (IS_ERR(tags))
2624 return tags;
2625 continue;
2626 }
2627 if (is_vlan_dev(upper)) {
2628 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2629 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2630 }
2631
2632 return tags;
2633 }
2634
2635 return NULL;
2636}
2637
2638static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2639{
2640 struct rtable *rt;
2641 struct bond_vlan_tag *tags;
2642 __be32 *targets = bond->params.arp_targets, addr;
2643 int i;
2644
2645 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2646 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2647 __func__, &targets[i]);
2648 tags = NULL;
2649
2650 /* Find out through which dev should the packet go */
2651 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2652 RTO_ONLINK, 0);
2653 if (IS_ERR(rt)) {
2654 /* there's no route to target - try to send arp
2655 * probe to generate any traffic (arp_validate=0)
2656 */
2657 if (bond->params.arp_validate)
2658 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2659 bond->dev->name,
2660 &targets[i]);
2661 bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2662 0, tags);
2663 continue;
2664 }
2665
2666 /* bond device itself */
2667 if (rt->dst.dev == bond->dev)
2668 goto found;
2669
2670 rcu_read_lock();
2671 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2672 rcu_read_unlock();
2673
2674 if (!IS_ERR_OR_NULL(tags))
2675 goto found;
2676
2677 /* Not our device - skip */
2678 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2679 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2680
2681 ip_rt_put(rt);
2682 continue;
2683
2684found:
2685 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2686 ip_rt_put(rt);
2687 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2688 kfree(tags);
2689 }
2690}
2691
2692static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2693{
2694 int i;
2695
2696 if (!sip || !bond_has_this_ip(bond, tip)) {
2697 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2698 __func__, &sip, &tip);
2699 return;
2700 }
2701
2702 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2703 if (i == -1) {
2704 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2705 __func__, &sip);
2706 return;
2707 }
2708 slave->last_rx = jiffies;
2709 slave->target_last_arp_rx[i] = jiffies;
2710}
2711
2712int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2713 struct slave *slave)
2714{
2715 struct arphdr *arp = (struct arphdr *)skb->data;
2716 struct slave *curr_active_slave, *curr_arp_slave;
2717 unsigned char *arp_ptr;
2718 __be32 sip, tip;
2719 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2720 unsigned int alen;
2721
2722 if (!slave_do_arp_validate(bond, slave)) {
2723 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2724 !slave_do_arp_validate_only(bond))
2725 slave->last_rx = jiffies;
2726 return RX_HANDLER_ANOTHER;
2727 } else if (!is_arp) {
2728 return RX_HANDLER_ANOTHER;
2729 }
2730
2731 alen = arp_hdr_len(bond->dev);
2732
2733 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2734 __func__, skb->dev->name);
2735
2736 if (alen > skb_headlen(skb)) {
2737 arp = kmalloc(alen, GFP_ATOMIC);
2738 if (!arp)
2739 goto out_unlock;
2740 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2741 goto out_unlock;
2742 }
2743
2744 if (arp->ar_hln != bond->dev->addr_len ||
2745 skb->pkt_type == PACKET_OTHERHOST ||
2746 skb->pkt_type == PACKET_LOOPBACK ||
2747 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2748 arp->ar_pro != htons(ETH_P_IP) ||
2749 arp->ar_pln != 4)
2750 goto out_unlock;
2751
2752 arp_ptr = (unsigned char *)(arp + 1);
2753 arp_ptr += bond->dev->addr_len;
2754 memcpy(&sip, arp_ptr, 4);
2755 arp_ptr += 4 + bond->dev->addr_len;
2756 memcpy(&tip, arp_ptr, 4);
2757
2758 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2759 __func__, slave->dev->name, bond_slave_state(slave),
2760 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2761 &sip, &tip);
2762
2763 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2764 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2765
2766 /* We 'trust' the received ARP enough to validate it if:
2767 *
2768 * (a) the slave receiving the ARP is active (which includes the
2769 * current ARP slave, if any), or
2770 *
2771 * (b) the receiving slave isn't active, but there is a currently
2772 * active slave and it received valid arp reply(s) after it became
2773 * the currently active slave, or
2774 *
2775 * (c) there is an ARP slave that sent an ARP during the prior ARP
2776 * interval, and we receive an ARP reply on any slave. We accept
2777 * these because switch FDB update delays may deliver the ARP
2778 * reply to a slave other than the sender of the ARP request.
2779 *
2780 * Note: for (b), backup slaves are receiving the broadcast ARP
2781 * request, not a reply. This request passes from the sending
2782 * slave through the L2 switch(es) to the receiving slave. Since
2783 * this is checking the request, sip/tip are swapped for
2784 * validation.
2785 *
2786 * This is done to avoid endless looping when we can't reach the
2787 * arp_ip_target and fool ourselves with our own arp requests.
2788 */
2789 if (bond_is_active_slave(slave))
2790 bond_validate_arp(bond, slave, sip, tip);
2791 else if (curr_active_slave &&
2792 time_after(slave_last_rx(bond, curr_active_slave),
2793 curr_active_slave->last_link_up))
2794 bond_validate_arp(bond, slave, tip, sip);
2795 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2796 bond_time_in_interval(bond,
2797 dev_trans_start(curr_arp_slave->dev), 1))
2798 bond_validate_arp(bond, slave, sip, tip);
2799
2800out_unlock:
2801 if (arp != (struct arphdr *)skb->data)
2802 kfree(arp);
2803 return RX_HANDLER_ANOTHER;
2804}
2805
2806/* function to verify if we're in the arp_interval timeslice, returns true if
2807 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2808 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2809 */
2810static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2811 int mod)
2812{
2813 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2814
2815 return time_in_range(jiffies,
2816 last_act - delta_in_ticks,
2817 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2818}
2819
2820/* This function is called regularly to monitor each slave's link
2821 * ensuring that traffic is being sent and received when arp monitoring
2822 * is used in load-balancing mode. if the adapter has been dormant, then an
2823 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2824 * arp monitoring in active backup mode.
2825 */
2826static void bond_loadbalance_arp_mon(struct bonding *bond)
2827{
2828 struct slave *slave, *oldcurrent;
2829 struct list_head *iter;
2830 int do_failover = 0, slave_state_changed = 0;
2831
2832 if (!bond_has_slaves(bond))
2833 goto re_arm;
2834
2835 rcu_read_lock();
2836
2837 oldcurrent = rcu_dereference(bond->curr_active_slave);
2838 /* see if any of the previous devices are up now (i.e. they have
2839 * xmt and rcv traffic). the curr_active_slave does not come into
2840 * the picture unless it is null. also, slave->last_link_up is not
2841 * needed here because we send an arp on each slave and give a slave
2842 * as long as it needs to get the tx/rx within the delta.
2843 * TODO: what about up/down delay in arp mode? it wasn't here before
2844 * so it can wait
2845 */
2846 bond_for_each_slave_rcu(bond, slave, iter) {
2847 unsigned long trans_start = dev_trans_start(slave->dev);
2848
2849 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2850
2851 if (slave->link != BOND_LINK_UP) {
2852 if (bond_time_in_interval(bond, trans_start, 1) &&
2853 bond_time_in_interval(bond, slave->last_rx, 1)) {
2854
2855 bond_propose_link_state(slave, BOND_LINK_UP);
2856 slave_state_changed = 1;
2857
2858 /* primary_slave has no meaning in round-robin
2859 * mode. the window of a slave being up and
2860 * curr_active_slave being null after enslaving
2861 * is closed.
2862 */
2863 if (!oldcurrent) {
2864 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2865 do_failover = 1;
2866 } else {
2867 slave_info(bond->dev, slave->dev, "interface is now up\n");
2868 }
2869 }
2870 } else {
2871 /* slave->link == BOND_LINK_UP */
2872
2873 /* not all switches will respond to an arp request
2874 * when the source ip is 0, so don't take the link down
2875 * if we don't know our ip yet
2876 */
2877 if (!bond_time_in_interval(bond, trans_start, 2) ||
2878 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2879
2880 bond_propose_link_state(slave, BOND_LINK_DOWN);
2881 slave_state_changed = 1;
2882
2883 if (slave->link_failure_count < UINT_MAX)
2884 slave->link_failure_count++;
2885
2886 slave_info(bond->dev, slave->dev, "interface is now down\n");
2887
2888 if (slave == oldcurrent)
2889 do_failover = 1;
2890 }
2891 }
2892
2893 /* note: if switch is in round-robin mode, all links
2894 * must tx arp to ensure all links rx an arp - otherwise
2895 * links may oscillate or not come up at all; if switch is
2896 * in something like xor mode, there is nothing we can
2897 * do - all replies will be rx'ed on same link causing slaves
2898 * to be unstable during low/no traffic periods
2899 */
2900 if (bond_slave_is_up(slave))
2901 bond_arp_send_all(bond, slave);
2902 }
2903
2904 rcu_read_unlock();
2905
2906 if (do_failover || slave_state_changed) {
2907 if (!rtnl_trylock())
2908 goto re_arm;
2909
2910 bond_for_each_slave(bond, slave, iter) {
2911 if (slave->link_new_state != BOND_LINK_NOCHANGE)
2912 slave->link = slave->link_new_state;
2913 }
2914
2915 if (slave_state_changed) {
2916 bond_slave_state_change(bond);
2917 if (BOND_MODE(bond) == BOND_MODE_XOR)
2918 bond_update_slave_arr(bond, NULL);
2919 }
2920 if (do_failover) {
2921 block_netpoll_tx();
2922 bond_select_active_slave(bond);
2923 unblock_netpoll_tx();
2924 }
2925 rtnl_unlock();
2926 }
2927
2928re_arm:
2929 if (bond->params.arp_interval)
2930 queue_delayed_work(bond->wq, &bond->arp_work,
2931 msecs_to_jiffies(bond->params.arp_interval));
2932}
2933
2934/* Called to inspect slaves for active-backup mode ARP monitor link state
2935 * changes. Sets proposed link state in slaves to specify what action
2936 * should take place for the slave. Returns 0 if no changes are found, >0
2937 * if changes to link states must be committed.
2938 *
2939 * Called with rcu_read_lock held.
2940 */
2941static int bond_ab_arp_inspect(struct bonding *bond)
2942{
2943 unsigned long trans_start, last_rx;
2944 struct list_head *iter;
2945 struct slave *slave;
2946 int commit = 0;
2947
2948 bond_for_each_slave_rcu(bond, slave, iter) {
2949 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2950 last_rx = slave_last_rx(bond, slave);
2951
2952 if (slave->link != BOND_LINK_UP) {
2953 if (bond_time_in_interval(bond, last_rx, 1)) {
2954 bond_propose_link_state(slave, BOND_LINK_UP);
2955 commit++;
2956 } else if (slave->link == BOND_LINK_BACK) {
2957 bond_propose_link_state(slave, BOND_LINK_FAIL);
2958 commit++;
2959 }
2960 continue;
2961 }
2962
2963 /* Give slaves 2*delta after being enslaved or made
2964 * active. This avoids bouncing, as the last receive
2965 * times need a full ARP monitor cycle to be updated.
2966 */
2967 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2968 continue;
2969
2970 /* Backup slave is down if:
2971 * - No current_arp_slave AND
2972 * - more than 3*delta since last receive AND
2973 * - the bond has an IP address
2974 *
2975 * Note: a non-null current_arp_slave indicates
2976 * the curr_active_slave went down and we are
2977 * searching for a new one; under this condition
2978 * we only take the curr_active_slave down - this
2979 * gives each slave a chance to tx/rx traffic
2980 * before being taken out
2981 */
2982 if (!bond_is_active_slave(slave) &&
2983 !rcu_access_pointer(bond->current_arp_slave) &&
2984 !bond_time_in_interval(bond, last_rx, 3)) {
2985 bond_propose_link_state(slave, BOND_LINK_DOWN);
2986 commit++;
2987 }
2988
2989 /* Active slave is down if:
2990 * - more than 2*delta since transmitting OR
2991 * - (more than 2*delta since receive AND
2992 * the bond has an IP address)
2993 */
2994 trans_start = dev_trans_start(slave->dev);
2995 if (bond_is_active_slave(slave) &&
2996 (!bond_time_in_interval(bond, trans_start, 2) ||
2997 !bond_time_in_interval(bond, last_rx, 2))) {
2998 bond_propose_link_state(slave, BOND_LINK_DOWN);
2999 commit++;
3000 }
3001 }
3002
3003 return commit;
3004}
3005
3006/* Called to commit link state changes noted by inspection step of
3007 * active-backup mode ARP monitor.
3008 *
3009 * Called with RTNL hold.
3010 */
3011static void bond_ab_arp_commit(struct bonding *bond)
3012{
3013 unsigned long trans_start;
3014 struct list_head *iter;
3015 struct slave *slave;
3016
3017 bond_for_each_slave(bond, slave, iter) {
3018 switch (slave->link_new_state) {
3019 case BOND_LINK_NOCHANGE:
3020 continue;
3021
3022 case BOND_LINK_UP:
3023 trans_start = dev_trans_start(slave->dev);
3024 if (rtnl_dereference(bond->curr_active_slave) != slave ||
3025 (!rtnl_dereference(bond->curr_active_slave) &&
3026 bond_time_in_interval(bond, trans_start, 1))) {
3027 struct slave *current_arp_slave;
3028
3029 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3030 bond_set_slave_link_state(slave, BOND_LINK_UP,
3031 BOND_SLAVE_NOTIFY_NOW);
3032 if (current_arp_slave) {
3033 bond_set_slave_inactive_flags(
3034 current_arp_slave,
3035 BOND_SLAVE_NOTIFY_NOW);
3036 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3037 }
3038
3039 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3040
3041 if (!rtnl_dereference(bond->curr_active_slave) ||
3042 slave == rtnl_dereference(bond->primary_slave))
3043 goto do_failover;
3044
3045 }
3046
3047 continue;
3048
3049 case BOND_LINK_DOWN:
3050 if (slave->link_failure_count < UINT_MAX)
3051 slave->link_failure_count++;
3052
3053 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3054 BOND_SLAVE_NOTIFY_NOW);
3055 bond_set_slave_inactive_flags(slave,
3056 BOND_SLAVE_NOTIFY_NOW);
3057
3058 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3059
3060 if (slave == rtnl_dereference(bond->curr_active_slave)) {
3061 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3062 goto do_failover;
3063 }
3064
3065 continue;
3066
3067 case BOND_LINK_FAIL:
3068 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3069 BOND_SLAVE_NOTIFY_NOW);
3070 bond_set_slave_inactive_flags(slave,
3071 BOND_SLAVE_NOTIFY_NOW);
3072
3073 /* A slave has just been enslaved and has become
3074 * the current active slave.
3075 */
3076 if (rtnl_dereference(bond->curr_active_slave))
3077 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3078 continue;
3079
3080 default:
3081 slave_err(bond->dev, slave->dev,
3082 "impossible: link_new_state %d on slave\n",
3083 slave->link_new_state);
3084 continue;
3085 }
3086
3087do_failover:
3088 block_netpoll_tx();
3089 bond_select_active_slave(bond);
3090 unblock_netpoll_tx();
3091 }
3092
3093 bond_set_carrier(bond);
3094}
3095
3096/* Send ARP probes for active-backup mode ARP monitor.
3097 *
3098 * Called with rcu_read_lock held.
3099 */
3100static bool bond_ab_arp_probe(struct bonding *bond)
3101{
3102 struct slave *slave, *before = NULL, *new_slave = NULL,
3103 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3104 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3105 struct list_head *iter;
3106 bool found = false;
3107 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3108
3109 if (curr_arp_slave && curr_active_slave)
3110 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3111 curr_arp_slave->dev->name,
3112 curr_active_slave->dev->name);
3113
3114 if (curr_active_slave) {
3115 bond_arp_send_all(bond, curr_active_slave);
3116 return should_notify_rtnl;
3117 }
3118
3119 /* if we don't have a curr_active_slave, search for the next available
3120 * backup slave from the current_arp_slave and make it the candidate
3121 * for becoming the curr_active_slave
3122 */
3123
3124 if (!curr_arp_slave) {
3125 curr_arp_slave = bond_first_slave_rcu(bond);
3126 if (!curr_arp_slave)
3127 return should_notify_rtnl;
3128 }
3129
3130 bond_for_each_slave_rcu(bond, slave, iter) {
3131 if (!found && !before && bond_slave_is_up(slave))
3132 before = slave;
3133
3134 if (found && !new_slave && bond_slave_is_up(slave))
3135 new_slave = slave;
3136 /* if the link state is up at this point, we
3137 * mark it down - this can happen if we have
3138 * simultaneous link failures and
3139 * reselect_active_interface doesn't make this
3140 * one the current slave so it is still marked
3141 * up when it is actually down
3142 */
3143 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3144 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3145 BOND_SLAVE_NOTIFY_LATER);
3146 if (slave->link_failure_count < UINT_MAX)
3147 slave->link_failure_count++;
3148
3149 bond_set_slave_inactive_flags(slave,
3150 BOND_SLAVE_NOTIFY_LATER);
3151
3152 slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3153 }
3154 if (slave == curr_arp_slave)
3155 found = true;
3156 }
3157
3158 if (!new_slave && before)
3159 new_slave = before;
3160
3161 if (!new_slave)
3162 goto check_state;
3163
3164 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3165 BOND_SLAVE_NOTIFY_LATER);
3166 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3167 bond_arp_send_all(bond, new_slave);
3168 new_slave->last_link_up = jiffies;
3169 rcu_assign_pointer(bond->current_arp_slave, new_slave);
3170
3171check_state:
3172 bond_for_each_slave_rcu(bond, slave, iter) {
3173 if (slave->should_notify || slave->should_notify_link) {
3174 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3175 break;
3176 }
3177 }
3178 return should_notify_rtnl;
3179}
3180
3181static void bond_activebackup_arp_mon(struct bonding *bond)
3182{
3183 bool should_notify_peers = false;
3184 bool should_notify_rtnl = false;
3185 int delta_in_ticks;
3186
3187 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3188
3189 if (!bond_has_slaves(bond))
3190 goto re_arm;
3191
3192 rcu_read_lock();
3193
3194 should_notify_peers = bond_should_notify_peers(bond);
3195
3196 if (bond_ab_arp_inspect(bond)) {
3197 rcu_read_unlock();
3198
3199 /* Race avoidance with bond_close flush of workqueue */
3200 if (!rtnl_trylock()) {
3201 delta_in_ticks = 1;
3202 should_notify_peers = false;
3203 goto re_arm;
3204 }
3205
3206 bond_ab_arp_commit(bond);
3207
3208 rtnl_unlock();
3209 rcu_read_lock();
3210 }
3211
3212 should_notify_rtnl = bond_ab_arp_probe(bond);
3213 rcu_read_unlock();
3214
3215re_arm:
3216 if (bond->params.arp_interval)
3217 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3218
3219 if (should_notify_peers || should_notify_rtnl) {
3220 if (!rtnl_trylock())
3221 return;
3222
3223 if (should_notify_peers)
3224 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3225 bond->dev);
3226 if (should_notify_rtnl) {
3227 bond_slave_state_notify(bond);
3228 bond_slave_link_notify(bond);
3229 }
3230
3231 rtnl_unlock();
3232 }
3233}
3234
3235static void bond_arp_monitor(struct work_struct *work)
3236{
3237 struct bonding *bond = container_of(work, struct bonding,
3238 arp_work.work);
3239
3240 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3241 bond_activebackup_arp_mon(bond);
3242 else
3243 bond_loadbalance_arp_mon(bond);
3244}
3245
3246/*-------------------------- netdev event handling --------------------------*/
3247
3248/* Change device name */
3249static int bond_event_changename(struct bonding *bond)
3250{
3251 bond_remove_proc_entry(bond);
3252 bond_create_proc_entry(bond);
3253
3254 bond_debug_reregister(bond);
3255
3256 return NOTIFY_DONE;
3257}
3258
3259static int bond_master_netdev_event(unsigned long event,
3260 struct net_device *bond_dev)
3261{
3262 struct bonding *event_bond = netdev_priv(bond_dev);
3263
3264 netdev_dbg(bond_dev, "%s called\n", __func__);
3265
3266 switch (event) {
3267 case NETDEV_CHANGENAME:
3268 return bond_event_changename(event_bond);
3269 case NETDEV_UNREGISTER:
3270 bond_remove_proc_entry(event_bond);
3271 break;
3272 case NETDEV_REGISTER:
3273 bond_create_proc_entry(event_bond);
3274 break;
3275 default:
3276 break;
3277 }
3278
3279 return NOTIFY_DONE;
3280}
3281
3282static int bond_slave_netdev_event(unsigned long event,
3283 struct net_device *slave_dev)
3284{
3285 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3286 struct bonding *bond;
3287 struct net_device *bond_dev;
3288
3289 /* A netdev event can be generated while enslaving a device
3290 * before netdev_rx_handler_register is called in which case
3291 * slave will be NULL
3292 */
3293 if (!slave) {
3294 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3295 return NOTIFY_DONE;
3296 }
3297
3298 bond_dev = slave->bond->dev;
3299 bond = slave->bond;
3300 primary = rtnl_dereference(bond->primary_slave);
3301
3302 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3303
3304 switch (event) {
3305 case NETDEV_UNREGISTER:
3306 if (bond_dev->type != ARPHRD_ETHER)
3307 bond_release_and_destroy(bond_dev, slave_dev);
3308 else
3309 __bond_release_one(bond_dev, slave_dev, false, true);
3310 break;
3311 case NETDEV_UP:
3312 case NETDEV_CHANGE:
3313 /* For 802.3ad mode only:
3314 * Getting invalid Speed/Duplex values here will put slave
3315 * in weird state. Mark it as link-fail if the link was
3316 * previously up or link-down if it hasn't yet come up, and
3317 * let link-monitoring (miimon) set it right when correct
3318 * speeds/duplex are available.
3319 */
3320 if (bond_update_speed_duplex(slave) &&
3321 BOND_MODE(bond) == BOND_MODE_8023AD) {
3322 if (slave->last_link_up)
3323 slave->link = BOND_LINK_FAIL;
3324 else
3325 slave->link = BOND_LINK_DOWN;
3326 }
3327
3328 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3329 bond_3ad_adapter_speed_duplex_changed(slave);
3330 fallthrough;
3331 case NETDEV_DOWN:
3332 /* Refresh slave-array if applicable!
3333 * If the setup does not use miimon or arpmon (mode-specific!),
3334 * then these events will not cause the slave-array to be
3335 * refreshed. This will cause xmit to use a slave that is not
3336 * usable. Avoid such situation by refeshing the array at these
3337 * events. If these (miimon/arpmon) parameters are configured
3338 * then array gets refreshed twice and that should be fine!
3339 */
3340 if (bond_mode_can_use_xmit_hash(bond))
3341 bond_update_slave_arr(bond, NULL);
3342 break;
3343 case NETDEV_CHANGEMTU:
3344 /* TODO: Should slaves be allowed to
3345 * independently alter their MTU? For
3346 * an active-backup bond, slaves need
3347 * not be the same type of device, so
3348 * MTUs may vary. For other modes,
3349 * slaves arguably should have the
3350 * same MTUs. To do this, we'd need to
3351 * take over the slave's change_mtu
3352 * function for the duration of their
3353 * servitude.
3354 */
3355 break;
3356 case NETDEV_CHANGENAME:
3357 /* we don't care if we don't have primary set */
3358 if (!bond_uses_primary(bond) ||
3359 !bond->params.primary[0])
3360 break;
3361
3362 if (slave == primary) {
3363 /* slave's name changed - he's no longer primary */
3364 RCU_INIT_POINTER(bond->primary_slave, NULL);
3365 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3366 /* we have a new primary slave */
3367 rcu_assign_pointer(bond->primary_slave, slave);
3368 } else { /* we didn't change primary - exit */
3369 break;
3370 }
3371
3372 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3373 primary ? slave_dev->name : "none");
3374
3375 block_netpoll_tx();
3376 bond_select_active_slave(bond);
3377 unblock_netpoll_tx();
3378 break;
3379 case NETDEV_FEAT_CHANGE:
3380 bond_compute_features(bond);
3381 break;
3382 case NETDEV_RESEND_IGMP:
3383 /* Propagate to master device */
3384 call_netdevice_notifiers(event, slave->bond->dev);
3385 break;
3386 default:
3387 break;
3388 }
3389
3390 return NOTIFY_DONE;
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 */
3400static int bond_netdev_event(struct notifier_block *this,
3401 unsigned long event, void *ptr)
3402{
3403 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3404
3405 netdev_dbg(event_dev, "%s received %s\n",
3406 __func__, netdev_cmd_to_name(event));
3407
3408 if (!(event_dev->priv_flags & IFF_BONDING))
3409 return NOTIFY_DONE;
3410
3411 if (event_dev->flags & IFF_MASTER) {
3412 int ret;
3413
3414 ret = bond_master_netdev_event(event, event_dev);
3415 if (ret != NOTIFY_DONE)
3416 return ret;
3417 }
3418
3419 if (event_dev->flags & IFF_SLAVE)
3420 return bond_slave_netdev_event(event, event_dev);
3421
3422 return NOTIFY_DONE;
3423}
3424
3425static struct notifier_block bond_netdev_notifier = {
3426 .notifier_call = bond_netdev_event,
3427};
3428
3429/*---------------------------- Hashing Policies -----------------------------*/
3430
3431/* L2 hash helper */
3432static inline u32 bond_eth_hash(struct sk_buff *skb)
3433{
3434 struct ethhdr *ep, hdr_tmp;
3435
3436 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3437 if (ep)
3438 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3439 return 0;
3440}
3441
3442static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3443 int *noff, int *proto, bool l34)
3444{
3445 const struct ipv6hdr *iph6;
3446 const struct iphdr *iph;
3447
3448 if (skb->protocol == htons(ETH_P_IP)) {
3449 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3450 return false;
3451 iph = (const struct iphdr *)(skb->data + *noff);
3452 iph_to_flow_copy_v4addrs(fk, iph);
3453 *noff += iph->ihl << 2;
3454 if (!ip_is_fragment(iph))
3455 *proto = iph->protocol;
3456 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3457 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3458 return false;
3459 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3460 iph_to_flow_copy_v6addrs(fk, iph6);
3461 *noff += sizeof(*iph6);
3462 *proto = iph6->nexthdr;
3463 } else {
3464 return false;
3465 }
3466
3467 if (l34 && *proto >= 0)
3468 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3469
3470 return true;
3471}
3472
3473/* Extract the appropriate headers based on bond's xmit policy */
3474static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3475 struct flow_keys *fk)
3476{
3477 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3478 int noff, proto = -1;
3479
3480 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3481 memset(fk, 0, sizeof(*fk));
3482 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3483 fk, NULL, 0, 0, 0, 0);
3484 }
3485
3486 fk->ports.ports = 0;
3487 memset(&fk->icmp, 0, sizeof(fk->icmp));
3488 noff = skb_network_offset(skb);
3489 if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3490 return false;
3491
3492 /* ICMP error packets contains at least 8 bytes of the header
3493 * of the packet which generated the error. Use this information
3494 * to correlate ICMP error packets within the same flow which
3495 * generated the error.
3496 */
3497 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3498 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3499 skb_transport_offset(skb),
3500 skb_headlen(skb));
3501 if (proto == IPPROTO_ICMP) {
3502 if (!icmp_is_err(fk->icmp.type))
3503 return true;
3504
3505 noff += sizeof(struct icmphdr);
3506 } else if (proto == IPPROTO_ICMPV6) {
3507 if (!icmpv6_is_err(fk->icmp.type))
3508 return true;
3509
3510 noff += sizeof(struct icmp6hdr);
3511 }
3512 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3513 }
3514
3515 return true;
3516}
3517
3518/**
3519 * bond_xmit_hash - generate a hash value based on the xmit policy
3520 * @bond: bonding device
3521 * @skb: buffer to use for headers
3522 *
3523 * This function will extract the necessary headers from the skb buffer and use
3524 * them to generate a hash based on the xmit_policy set in the bonding device
3525 */
3526u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3527{
3528 struct flow_keys flow;
3529 u32 hash;
3530
3531 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3532 skb->l4_hash)
3533 return skb->hash;
3534
3535 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3536 !bond_flow_dissect(bond, skb, &flow))
3537 return bond_eth_hash(skb);
3538
3539 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3540 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3541 hash = bond_eth_hash(skb);
3542 } else {
3543 if (flow.icmp.id)
3544 memcpy(&hash, &flow.icmp, sizeof(hash));
3545 else
3546 memcpy(&hash, &flow.ports.ports, sizeof(hash));
3547 }
3548 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3549 (__force u32)flow_get_u32_src(&flow);
3550 hash ^= (hash >> 16);
3551 hash ^= (hash >> 8);
3552
3553 return hash >> 1;
3554}
3555
3556/*-------------------------- Device entry points ----------------------------*/
3557
3558void bond_work_init_all(struct bonding *bond)
3559{
3560 INIT_DELAYED_WORK(&bond->mcast_work,
3561 bond_resend_igmp_join_requests_delayed);
3562 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3563 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3564 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3565 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3566 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3567}
3568
3569static void bond_work_cancel_all(struct bonding *bond)
3570{
3571 cancel_delayed_work_sync(&bond->mii_work);
3572 cancel_delayed_work_sync(&bond->arp_work);
3573 cancel_delayed_work_sync(&bond->alb_work);
3574 cancel_delayed_work_sync(&bond->ad_work);
3575 cancel_delayed_work_sync(&bond->mcast_work);
3576 cancel_delayed_work_sync(&bond->slave_arr_work);
3577}
3578
3579static int bond_open(struct net_device *bond_dev)
3580{
3581 struct bonding *bond = netdev_priv(bond_dev);
3582 struct list_head *iter;
3583 struct slave *slave;
3584
3585 /* reset slave->backup and slave->inactive */
3586 if (bond_has_slaves(bond)) {
3587 bond_for_each_slave(bond, slave, iter) {
3588 if (bond_uses_primary(bond) &&
3589 slave != rcu_access_pointer(bond->curr_active_slave)) {
3590 bond_set_slave_inactive_flags(slave,
3591 BOND_SLAVE_NOTIFY_NOW);
3592 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3593 bond_set_slave_active_flags(slave,
3594 BOND_SLAVE_NOTIFY_NOW);
3595 }
3596 }
3597 }
3598
3599 if (bond_is_lb(bond)) {
3600 /* bond_alb_initialize must be called before the timer
3601 * is started.
3602 */
3603 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3604 return -ENOMEM;
3605 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3606 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3607 }
3608
3609 if (bond->params.miimon) /* link check interval, in milliseconds. */
3610 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3611
3612 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3613 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3614 bond->recv_probe = bond_arp_rcv;
3615 }
3616
3617 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3618 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3619 /* register to receive LACPDUs */
3620 bond->recv_probe = bond_3ad_lacpdu_recv;
3621 bond_3ad_initiate_agg_selection(bond, 1);
3622 }
3623
3624 if (bond_mode_can_use_xmit_hash(bond))
3625 bond_update_slave_arr(bond, NULL);
3626
3627 return 0;
3628}
3629
3630static int bond_close(struct net_device *bond_dev)
3631{
3632 struct bonding *bond = netdev_priv(bond_dev);
3633
3634 bond_work_cancel_all(bond);
3635 bond->send_peer_notif = 0;
3636 if (bond_is_lb(bond))
3637 bond_alb_deinitialize(bond);
3638 bond->recv_probe = NULL;
3639
3640 return 0;
3641}
3642
3643/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3644 * that some drivers can provide 32bit values only.
3645 */
3646static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3647 const struct rtnl_link_stats64 *_new,
3648 const struct rtnl_link_stats64 *_old)
3649{
3650 const u64 *new = (const u64 *)_new;
3651 const u64 *old = (const u64 *)_old;
3652 u64 *res = (u64 *)_res;
3653 int i;
3654
3655 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3656 u64 nv = new[i];
3657 u64 ov = old[i];
3658 s64 delta = nv - ov;
3659
3660 /* detects if this particular field is 32bit only */
3661 if (((nv | ov) >> 32) == 0)
3662 delta = (s64)(s32)((u32)nv - (u32)ov);
3663
3664 /* filter anomalies, some drivers reset their stats
3665 * at down/up events.
3666 */
3667 if (delta > 0)
3668 res[i] += delta;
3669 }
3670}
3671
3672#ifdef CONFIG_LOCKDEP
3673static int bond_get_lowest_level_rcu(struct net_device *dev)
3674{
3675 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3676 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3677 int cur = 0, max = 0;
3678
3679 now = dev;
3680 iter = &dev->adj_list.lower;
3681
3682 while (1) {
3683 next = NULL;
3684 while (1) {
3685 ldev = netdev_next_lower_dev_rcu(now, &iter);
3686 if (!ldev)
3687 break;
3688
3689 next = ldev;
3690 niter = &ldev->adj_list.lower;
3691 dev_stack[cur] = now;
3692 iter_stack[cur++] = iter;
3693 if (max <= cur)
3694 max = cur;
3695 break;
3696 }
3697
3698 if (!next) {
3699 if (!cur)
3700 return max;
3701 next = dev_stack[--cur];
3702 niter = iter_stack[cur];
3703 }
3704
3705 now = next;
3706 iter = niter;
3707 }
3708
3709 return max;
3710}
3711#endif
3712
3713static void bond_get_stats(struct net_device *bond_dev,
3714 struct rtnl_link_stats64 *stats)
3715{
3716 struct bonding *bond = netdev_priv(bond_dev);
3717 struct rtnl_link_stats64 temp;
3718 struct list_head *iter;
3719 struct slave *slave;
3720 int nest_level = 0;
3721
3722
3723 rcu_read_lock();
3724#ifdef CONFIG_LOCKDEP
3725 nest_level = bond_get_lowest_level_rcu(bond_dev);
3726#endif
3727
3728 spin_lock_nested(&bond->stats_lock, nest_level);
3729 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3730
3731 bond_for_each_slave_rcu(bond, slave, iter) {
3732 const struct rtnl_link_stats64 *new =
3733 dev_get_stats(slave->dev, &temp);
3734
3735 bond_fold_stats(stats, new, &slave->slave_stats);
3736
3737 /* save off the slave stats for the next run */
3738 memcpy(&slave->slave_stats, new, sizeof(*new));
3739 }
3740
3741 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3742 spin_unlock(&bond->stats_lock);
3743 rcu_read_unlock();
3744}
3745
3746static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3747{
3748 struct bonding *bond = netdev_priv(bond_dev);
3749 struct net_device *slave_dev = NULL;
3750 struct ifbond k_binfo;
3751 struct ifbond __user *u_binfo = NULL;
3752 struct ifslave k_sinfo;
3753 struct ifslave __user *u_sinfo = NULL;
3754 struct mii_ioctl_data *mii = NULL;
3755 struct bond_opt_value newval;
3756 struct net *net;
3757 int res = 0;
3758
3759 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3760
3761 switch (cmd) {
3762 case SIOCGMIIPHY:
3763 mii = if_mii(ifr);
3764 if (!mii)
3765 return -EINVAL;
3766
3767 mii->phy_id = 0;
3768 fallthrough;
3769 case SIOCGMIIREG:
3770 /* We do this again just in case we were called by SIOCGMIIREG
3771 * instead of SIOCGMIIPHY.
3772 */
3773 mii = if_mii(ifr);
3774 if (!mii)
3775 return -EINVAL;
3776
3777 if (mii->reg_num == 1) {
3778 mii->val_out = 0;
3779 if (netif_carrier_ok(bond->dev))
3780 mii->val_out = BMSR_LSTATUS;
3781 }
3782
3783 return 0;
3784 case BOND_INFO_QUERY_OLD:
3785 case SIOCBONDINFOQUERY:
3786 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3787
3788 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3789 return -EFAULT;
3790
3791 bond_info_query(bond_dev, &k_binfo);
3792 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3793 return -EFAULT;
3794
3795 return 0;
3796 case BOND_SLAVE_INFO_QUERY_OLD:
3797 case SIOCBONDSLAVEINFOQUERY:
3798 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3799
3800 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3801 return -EFAULT;
3802
3803 res = bond_slave_info_query(bond_dev, &k_sinfo);
3804 if (res == 0 &&
3805 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3806 return -EFAULT;
3807
3808 return res;
3809 default:
3810 break;
3811 }
3812
3813 net = dev_net(bond_dev);
3814
3815 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3816 return -EPERM;
3817
3818 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3819
3820 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3821
3822 if (!slave_dev)
3823 return -ENODEV;
3824
3825 switch (cmd) {
3826 case BOND_ENSLAVE_OLD:
3827 case SIOCBONDENSLAVE:
3828 res = bond_enslave(bond_dev, slave_dev, NULL);
3829 break;
3830 case BOND_RELEASE_OLD:
3831 case SIOCBONDRELEASE:
3832 res = bond_release(bond_dev, slave_dev);
3833 break;
3834 case BOND_SETHWADDR_OLD:
3835 case SIOCBONDSETHWADDR:
3836 res = bond_set_dev_addr(bond_dev, slave_dev);
3837 break;
3838 case BOND_CHANGE_ACTIVE_OLD:
3839 case SIOCBONDCHANGEACTIVE:
3840 bond_opt_initstr(&newval, slave_dev->name);
3841 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3842 &newval);
3843 break;
3844 default:
3845 res = -EOPNOTSUPP;
3846 }
3847
3848 return res;
3849}
3850
3851static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3852{
3853 struct bonding *bond = netdev_priv(bond_dev);
3854
3855 if (change & IFF_PROMISC)
3856 bond_set_promiscuity(bond,
3857 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3858
3859 if (change & IFF_ALLMULTI)
3860 bond_set_allmulti(bond,
3861 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3862}
3863
3864static void bond_set_rx_mode(struct net_device *bond_dev)
3865{
3866 struct bonding *bond = netdev_priv(bond_dev);
3867 struct list_head *iter;
3868 struct slave *slave;
3869
3870 rcu_read_lock();
3871 if (bond_uses_primary(bond)) {
3872 slave = rcu_dereference(bond->curr_active_slave);
3873 if (slave) {
3874 dev_uc_sync(slave->dev, bond_dev);
3875 dev_mc_sync(slave->dev, bond_dev);
3876 }
3877 } else {
3878 bond_for_each_slave_rcu(bond, slave, iter) {
3879 dev_uc_sync_multiple(slave->dev, bond_dev);
3880 dev_mc_sync_multiple(slave->dev, bond_dev);
3881 }
3882 }
3883 rcu_read_unlock();
3884}
3885
3886static int bond_neigh_init(struct neighbour *n)
3887{
3888 struct bonding *bond = netdev_priv(n->dev);
3889 const struct net_device_ops *slave_ops;
3890 struct neigh_parms parms;
3891 struct slave *slave;
3892 int ret = 0;
3893
3894 rcu_read_lock();
3895 slave = bond_first_slave_rcu(bond);
3896 if (!slave)
3897 goto out;
3898 slave_ops = slave->dev->netdev_ops;
3899 if (!slave_ops->ndo_neigh_setup)
3900 goto out;
3901
3902 /* TODO: find another way [1] to implement this.
3903 * Passing a zeroed structure is fragile,
3904 * but at least we do not pass garbage.
3905 *
3906 * [1] One way would be that ndo_neigh_setup() never touch
3907 * struct neigh_parms, but propagate the new neigh_setup()
3908 * back to ___neigh_create() / neigh_parms_alloc()
3909 */
3910 memset(&parms, 0, sizeof(parms));
3911 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3912
3913 if (ret)
3914 goto out;
3915
3916 if (parms.neigh_setup)
3917 ret = parms.neigh_setup(n);
3918out:
3919 rcu_read_unlock();
3920 return ret;
3921}
3922
3923/* The bonding ndo_neigh_setup is called at init time beofre any
3924 * slave exists. So we must declare proxy setup function which will
3925 * be used at run time to resolve the actual slave neigh param setup.
3926 *
3927 * It's also called by master devices (such as vlans) to setup their
3928 * underlying devices. In that case - do nothing, we're already set up from
3929 * our init.
3930 */
3931static int bond_neigh_setup(struct net_device *dev,
3932 struct neigh_parms *parms)
3933{
3934 /* modify only our neigh_parms */
3935 if (parms->dev == dev)
3936 parms->neigh_setup = bond_neigh_init;
3937
3938 return 0;
3939}
3940
3941/* Change the MTU of all of a master's slaves to match the master */
3942static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3943{
3944 struct bonding *bond = netdev_priv(bond_dev);
3945 struct slave *slave, *rollback_slave;
3946 struct list_head *iter;
3947 int res = 0;
3948
3949 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3950
3951 bond_for_each_slave(bond, slave, iter) {
3952 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3953 slave, slave->dev->netdev_ops->ndo_change_mtu);
3954
3955 res = dev_set_mtu(slave->dev, new_mtu);
3956
3957 if (res) {
3958 /* If we failed to set the slave's mtu to the new value
3959 * we must abort the operation even in ACTIVE_BACKUP
3960 * mode, because if we allow the backup slaves to have
3961 * different mtu values than the active slave we'll
3962 * need to change their mtu when doing a failover. That
3963 * means changing their mtu from timer context, which
3964 * is probably not a good idea.
3965 */
3966 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3967 res, new_mtu);
3968 goto unwind;
3969 }
3970 }
3971
3972 bond_dev->mtu = new_mtu;
3973
3974 return 0;
3975
3976unwind:
3977 /* unwind from head to the slave that failed */
3978 bond_for_each_slave(bond, rollback_slave, iter) {
3979 int tmp_res;
3980
3981 if (rollback_slave == slave)
3982 break;
3983
3984 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3985 if (tmp_res)
3986 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3987 tmp_res);
3988 }
3989
3990 return res;
3991}
3992
3993/* Change HW address
3994 *
3995 * Note that many devices must be down to change the HW address, and
3996 * downing the master releases all slaves. We can make bonds full of
3997 * bonding devices to test this, however.
3998 */
3999static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4000{
4001 struct bonding *bond = netdev_priv(bond_dev);
4002 struct slave *slave, *rollback_slave;
4003 struct sockaddr_storage *ss = addr, tmp_ss;
4004 struct list_head *iter;
4005 int res = 0;
4006
4007 if (BOND_MODE(bond) == BOND_MODE_ALB)
4008 return bond_alb_set_mac_address(bond_dev, addr);
4009
4010
4011 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4012
4013 /* If fail_over_mac is enabled, do nothing and return success.
4014 * Returning an error causes ifenslave to fail.
4015 */
4016 if (bond->params.fail_over_mac &&
4017 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4018 return 0;
4019
4020 if (!is_valid_ether_addr(ss->__data))
4021 return -EADDRNOTAVAIL;
4022
4023 bond_for_each_slave(bond, slave, iter) {
4024 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4025 __func__, slave);
4026 res = dev_set_mac_address(slave->dev, addr, NULL);
4027 if (res) {
4028 /* TODO: consider downing the slave
4029 * and retry ?
4030 * User should expect communications
4031 * breakage anyway until ARP finish
4032 * updating, so...
4033 */
4034 slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4035 __func__, res);
4036 goto unwind;
4037 }
4038 }
4039
4040 /* success */
4041 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4042 return 0;
4043
4044unwind:
4045 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4046 tmp_ss.ss_family = bond_dev->type;
4047
4048 /* unwind from head to the slave that failed */
4049 bond_for_each_slave(bond, rollback_slave, iter) {
4050 int tmp_res;
4051
4052 if (rollback_slave == slave)
4053 break;
4054
4055 tmp_res = dev_set_mac_address(rollback_slave->dev,
4056 (struct sockaddr *)&tmp_ss, NULL);
4057 if (tmp_res) {
4058 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4059 __func__, tmp_res);
4060 }
4061 }
4062
4063 return res;
4064}
4065
4066/**
4067 * bond_get_slave_by_id - get xmit slave with slave_id
4068 * @bond: bonding device that is transmitting
4069 * @slave_id: slave id up to slave_cnt-1 through which to transmit
4070 *
4071 * This function tries to get slave with slave_id but in case
4072 * it fails, it tries to find the first available slave for transmission.
4073 */
4074static struct slave *bond_get_slave_by_id(struct bonding *bond,
4075 int slave_id)
4076{
4077 struct list_head *iter;
4078 struct slave *slave;
4079 int i = slave_id;
4080
4081 /* Here we start from the slave with slave_id */
4082 bond_for_each_slave_rcu(bond, slave, iter) {
4083 if (--i < 0) {
4084 if (bond_slave_can_tx(slave))
4085 return slave;
4086 }
4087 }
4088
4089 /* Here we start from the first slave up to slave_id */
4090 i = slave_id;
4091 bond_for_each_slave_rcu(bond, slave, iter) {
4092 if (--i < 0)
4093 break;
4094 if (bond_slave_can_tx(slave))
4095 return slave;
4096 }
4097 /* no slave that can tx has been found */
4098 return NULL;
4099}
4100
4101/**
4102 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4103 * @bond: bonding device to use
4104 *
4105 * Based on the value of the bonding device's packets_per_slave parameter
4106 * this function generates a slave id, which is usually used as the next
4107 * slave to transmit through.
4108 */
4109static u32 bond_rr_gen_slave_id(struct bonding *bond)
4110{
4111 u32 slave_id;
4112 struct reciprocal_value reciprocal_packets_per_slave;
4113 int packets_per_slave = bond->params.packets_per_slave;
4114
4115 switch (packets_per_slave) {
4116 case 0:
4117 slave_id = prandom_u32();
4118 break;
4119 case 1:
4120 slave_id = bond->rr_tx_counter;
4121 break;
4122 default:
4123 reciprocal_packets_per_slave =
4124 bond->params.reciprocal_packets_per_slave;
4125 slave_id = reciprocal_divide(bond->rr_tx_counter,
4126 reciprocal_packets_per_slave);
4127 break;
4128 }
4129 bond->rr_tx_counter++;
4130
4131 return slave_id;
4132}
4133
4134static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4135 struct sk_buff *skb)
4136{
4137 struct slave *slave;
4138 int slave_cnt;
4139 u32 slave_id;
4140
4141 /* Start with the curr_active_slave that joined the bond as the
4142 * default for sending IGMP traffic. For failover purposes one
4143 * needs to maintain some consistency for the interface that will
4144 * send the join/membership reports. The curr_active_slave found
4145 * will send all of this type of traffic.
4146 */
4147 if (skb->protocol == htons(ETH_P_IP)) {
4148 int noff = skb_network_offset(skb);
4149 struct iphdr *iph;
4150
4151 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4152 goto non_igmp;
4153
4154 iph = ip_hdr(skb);
4155 if (iph->protocol == IPPROTO_IGMP) {
4156 slave = rcu_dereference(bond->curr_active_slave);
4157 if (slave)
4158 return slave;
4159 return bond_get_slave_by_id(bond, 0);
4160 }
4161 }
4162
4163non_igmp:
4164 slave_cnt = READ_ONCE(bond->slave_cnt);
4165 if (likely(slave_cnt)) {
4166 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4167 return bond_get_slave_by_id(bond, slave_id);
4168 }
4169 return NULL;
4170}
4171
4172static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4173 struct net_device *bond_dev)
4174{
4175 struct bonding *bond = netdev_priv(bond_dev);
4176 struct slave *slave;
4177
4178 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4179 if (likely(slave))
4180 return bond_dev_queue_xmit(bond, skb, slave->dev);
4181
4182 return bond_tx_drop(bond_dev, skb);
4183}
4184
4185static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4186 struct sk_buff *skb)
4187{
4188 return rcu_dereference(bond->curr_active_slave);
4189}
4190
4191/* In active-backup mode, we know that bond->curr_active_slave is always valid if
4192 * the bond has a usable interface.
4193 */
4194static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4195 struct net_device *bond_dev)
4196{
4197 struct bonding *bond = netdev_priv(bond_dev);
4198 struct slave *slave;
4199
4200 slave = bond_xmit_activebackup_slave_get(bond, skb);
4201 if (slave)
4202 return bond_dev_queue_xmit(bond, skb, slave->dev);
4203
4204 return bond_tx_drop(bond_dev, skb);
4205}
4206
4207/* Use this to update slave_array when (a) it's not appropriate to update
4208 * slave_array right away (note that update_slave_array() may sleep)
4209 * and / or (b) RTNL is not held.
4210 */
4211void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4212{
4213 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4214}
4215
4216/* Slave array work handler. Holds only RTNL */
4217static void bond_slave_arr_handler(struct work_struct *work)
4218{
4219 struct bonding *bond = container_of(work, struct bonding,
4220 slave_arr_work.work);
4221 int ret;
4222
4223 if (!rtnl_trylock())
4224 goto err;
4225
4226 ret = bond_update_slave_arr(bond, NULL);
4227 rtnl_unlock();
4228 if (ret) {
4229 pr_warn_ratelimited("Failed to update slave array from WT\n");
4230 goto err;
4231 }
4232 return;
4233
4234err:
4235 bond_slave_arr_work_rearm(bond, 1);
4236}
4237
4238static void bond_skip_slave(struct bond_up_slave *slaves,
4239 struct slave *skipslave)
4240{
4241 int idx;
4242
4243 /* Rare situation where caller has asked to skip a specific
4244 * slave but allocation failed (most likely!). BTW this is
4245 * only possible when the call is initiated from
4246 * __bond_release_one(). In this situation; overwrite the
4247 * skipslave entry in the array with the last entry from the
4248 * array to avoid a situation where the xmit path may choose
4249 * this to-be-skipped slave to send a packet out.
4250 */
4251 for (idx = 0; slaves && idx < slaves->count; idx++) {
4252 if (skipslave == slaves->arr[idx]) {
4253 slaves->arr[idx] =
4254 slaves->arr[slaves->count - 1];
4255 slaves->count--;
4256 break;
4257 }
4258 }
4259}
4260
4261static void bond_set_slave_arr(struct bonding *bond,
4262 struct bond_up_slave *usable_slaves,
4263 struct bond_up_slave *all_slaves)
4264{
4265 struct bond_up_slave *usable, *all;
4266
4267 usable = rtnl_dereference(bond->usable_slaves);
4268 rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4269 kfree_rcu(usable, rcu);
4270
4271 all = rtnl_dereference(bond->all_slaves);
4272 rcu_assign_pointer(bond->all_slaves, all_slaves);
4273 kfree_rcu(all, rcu);
4274}
4275
4276static void bond_reset_slave_arr(struct bonding *bond)
4277{
4278 struct bond_up_slave *usable, *all;
4279
4280 usable = rtnl_dereference(bond->usable_slaves);
4281 if (usable) {
4282 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4283 kfree_rcu(usable, rcu);
4284 }
4285
4286 all = rtnl_dereference(bond->all_slaves);
4287 if (all) {
4288 RCU_INIT_POINTER(bond->all_slaves, NULL);
4289 kfree_rcu(all, rcu);
4290 }
4291}
4292
4293/* Build the usable slaves array in control path for modes that use xmit-hash
4294 * to determine the slave interface -
4295 * (a) BOND_MODE_8023AD
4296 * (b) BOND_MODE_XOR
4297 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4298 *
4299 * The caller is expected to hold RTNL only and NO other lock!
4300 */
4301int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4302{
4303 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4304 struct slave *slave;
4305 struct list_head *iter;
4306 int agg_id = 0;
4307 int ret = 0;
4308
4309#ifdef CONFIG_LOCKDEP
4310 WARN_ON(lockdep_is_held(&bond->mode_lock));
4311#endif
4312
4313 usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4314 bond->slave_cnt), GFP_KERNEL);
4315 all_slaves = kzalloc(struct_size(all_slaves, arr,
4316 bond->slave_cnt), GFP_KERNEL);
4317 if (!usable_slaves || !all_slaves) {
4318 ret = -ENOMEM;
4319 goto out;
4320 }
4321 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4322 struct ad_info ad_info;
4323
4324 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4325 pr_debug("bond_3ad_get_active_agg_info failed\n");
4326 /* No active aggragator means it's not safe to use
4327 * the previous array.
4328 */
4329 bond_reset_slave_arr(bond);
4330 goto out;
4331 }
4332 agg_id = ad_info.aggregator_id;
4333 }
4334 bond_for_each_slave(bond, slave, iter) {
4335 if (skipslave == slave)
4336 continue;
4337
4338 all_slaves->arr[all_slaves->count++] = slave;
4339 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4340 struct aggregator *agg;
4341
4342 agg = SLAVE_AD_INFO(slave)->port.aggregator;
4343 if (!agg || agg->aggregator_identifier != agg_id)
4344 continue;
4345 }
4346 if (!bond_slave_can_tx(slave))
4347 continue;
4348
4349 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4350 usable_slaves->count);
4351
4352 usable_slaves->arr[usable_slaves->count++] = slave;
4353 }
4354
4355 bond_set_slave_arr(bond, usable_slaves, all_slaves);
4356 return ret;
4357out:
4358 if (ret != 0 && skipslave) {
4359 bond_skip_slave(rtnl_dereference(bond->all_slaves),
4360 skipslave);
4361 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4362 skipslave);
4363 }
4364 kfree_rcu(all_slaves, rcu);
4365 kfree_rcu(usable_slaves, rcu);
4366
4367 return ret;
4368}
4369
4370static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4371 struct sk_buff *skb,
4372 struct bond_up_slave *slaves)
4373{
4374 struct slave *slave;
4375 unsigned int count;
4376 u32 hash;
4377
4378 hash = bond_xmit_hash(bond, skb);
4379 count = slaves ? READ_ONCE(slaves->count) : 0;
4380 if (unlikely(!count))
4381 return NULL;
4382
4383 slave = slaves->arr[hash % count];
4384 return slave;
4385}
4386
4387/* Use this Xmit function for 3AD as well as XOR modes. The current
4388 * usable slave array is formed in the control path. The xmit function
4389 * just calculates hash and sends the packet out.
4390 */
4391static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4392 struct net_device *dev)
4393{
4394 struct bonding *bond = netdev_priv(dev);
4395 struct bond_up_slave *slaves;
4396 struct slave *slave;
4397
4398 slaves = rcu_dereference(bond->usable_slaves);
4399 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4400 if (likely(slave))
4401 return bond_dev_queue_xmit(bond, skb, slave->dev);
4402
4403 return bond_tx_drop(dev, skb);
4404}
4405
4406/* in broadcast mode, we send everything to all usable interfaces. */
4407static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4408 struct net_device *bond_dev)
4409{
4410 struct bonding *bond = netdev_priv(bond_dev);
4411 struct slave *slave = NULL;
4412 struct list_head *iter;
4413
4414 bond_for_each_slave_rcu(bond, slave, iter) {
4415 if (bond_is_last_slave(bond, slave))
4416 break;
4417 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4418 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4419
4420 if (!skb2) {
4421 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4422 bond_dev->name, __func__);
4423 continue;
4424 }
4425 bond_dev_queue_xmit(bond, skb2, slave->dev);
4426 }
4427 }
4428 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4429 return bond_dev_queue_xmit(bond, skb, slave->dev);
4430
4431 return bond_tx_drop(bond_dev, skb);
4432}
4433
4434/*------------------------- Device initialization ---------------------------*/
4435
4436/* Lookup the slave that corresponds to a qid */
4437static inline int bond_slave_override(struct bonding *bond,
4438 struct sk_buff *skb)
4439{
4440 struct slave *slave = NULL;
4441 struct list_head *iter;
4442
4443 if (!skb_rx_queue_recorded(skb))
4444 return 1;
4445
4446 /* Find out if any slaves have the same mapping as this skb. */
4447 bond_for_each_slave_rcu(bond, slave, iter) {
4448 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4449 if (bond_slave_is_up(slave) &&
4450 slave->link == BOND_LINK_UP) {
4451 bond_dev_queue_xmit(bond, skb, slave->dev);
4452 return 0;
4453 }
4454 /* If the slave isn't UP, use default transmit policy. */
4455 break;
4456 }
4457 }
4458
4459 return 1;
4460}
4461
4462
4463static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4464 struct net_device *sb_dev)
4465{
4466 /* This helper function exists to help dev_pick_tx get the correct
4467 * destination queue. Using a helper function skips a call to
4468 * skb_tx_hash and will put the skbs in the queue we expect on their
4469 * way down to the bonding driver.
4470 */
4471 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4472
4473 /* Save the original txq to restore before passing to the driver */
4474 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4475
4476 if (unlikely(txq >= dev->real_num_tx_queues)) {
4477 do {
4478 txq -= dev->real_num_tx_queues;
4479 } while (txq >= dev->real_num_tx_queues);
4480 }
4481 return txq;
4482}
4483
4484static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4485 struct sk_buff *skb,
4486 bool all_slaves)
4487{
4488 struct bonding *bond = netdev_priv(master_dev);
4489 struct bond_up_slave *slaves;
4490 struct slave *slave = NULL;
4491
4492 switch (BOND_MODE(bond)) {
4493 case BOND_MODE_ROUNDROBIN:
4494 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4495 break;
4496 case BOND_MODE_ACTIVEBACKUP:
4497 slave = bond_xmit_activebackup_slave_get(bond, skb);
4498 break;
4499 case BOND_MODE_8023AD:
4500 case BOND_MODE_XOR:
4501 if (all_slaves)
4502 slaves = rcu_dereference(bond->all_slaves);
4503 else
4504 slaves = rcu_dereference(bond->usable_slaves);
4505 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4506 break;
4507 case BOND_MODE_BROADCAST:
4508 break;
4509 case BOND_MODE_ALB:
4510 slave = bond_xmit_alb_slave_get(bond, skb);
4511 break;
4512 case BOND_MODE_TLB:
4513 slave = bond_xmit_tlb_slave_get(bond, skb);
4514 break;
4515 default:
4516 /* Should never happen, mode already checked */
4517 WARN_ONCE(true, "Unknown bonding mode");
4518 break;
4519 }
4520
4521 if (slave)
4522 return slave->dev;
4523 return NULL;
4524}
4525
4526static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4527{
4528 struct bonding *bond = netdev_priv(dev);
4529
4530 if (bond_should_override_tx_queue(bond) &&
4531 !bond_slave_override(bond, skb))
4532 return NETDEV_TX_OK;
4533
4534 switch (BOND_MODE(bond)) {
4535 case BOND_MODE_ROUNDROBIN:
4536 return bond_xmit_roundrobin(skb, dev);
4537 case BOND_MODE_ACTIVEBACKUP:
4538 return bond_xmit_activebackup(skb, dev);
4539 case BOND_MODE_8023AD:
4540 case BOND_MODE_XOR:
4541 return bond_3ad_xor_xmit(skb, dev);
4542 case BOND_MODE_BROADCAST:
4543 return bond_xmit_broadcast(skb, dev);
4544 case BOND_MODE_ALB:
4545 return bond_alb_xmit(skb, dev);
4546 case BOND_MODE_TLB:
4547 return bond_tlb_xmit(skb, dev);
4548 default:
4549 /* Should never happen, mode already checked */
4550 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4551 WARN_ON_ONCE(1);
4552 return bond_tx_drop(dev, skb);
4553 }
4554}
4555
4556static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4557{
4558 struct bonding *bond = netdev_priv(dev);
4559 netdev_tx_t ret = NETDEV_TX_OK;
4560
4561 /* If we risk deadlock from transmitting this in the
4562 * netpoll path, tell netpoll to queue the frame for later tx
4563 */
4564 if (unlikely(is_netpoll_tx_blocked(dev)))
4565 return NETDEV_TX_BUSY;
4566
4567 rcu_read_lock();
4568 if (bond_has_slaves(bond))
4569 ret = __bond_start_xmit(skb, dev);
4570 else
4571 ret = bond_tx_drop(dev, skb);
4572 rcu_read_unlock();
4573
4574 return ret;
4575}
4576
4577static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4578{
4579 if (speed == 0 || speed == SPEED_UNKNOWN)
4580 speed = slave->speed;
4581 else
4582 speed = min(speed, slave->speed);
4583
4584 return speed;
4585}
4586
4587static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4588 struct ethtool_link_ksettings *cmd)
4589{
4590 struct bonding *bond = netdev_priv(bond_dev);
4591 struct list_head *iter;
4592 struct slave *slave;
4593 u32 speed = 0;
4594
4595 cmd->base.duplex = DUPLEX_UNKNOWN;
4596 cmd->base.port = PORT_OTHER;
4597
4598 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4599 * do not need to check mode. Though link speed might not represent
4600 * the true receive or transmit bandwidth (not all modes are symmetric)
4601 * this is an accurate maximum.
4602 */
4603 bond_for_each_slave(bond, slave, iter) {
4604 if (bond_slave_can_tx(slave)) {
4605 if (slave->speed != SPEED_UNKNOWN) {
4606 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4607 speed = bond_mode_bcast_speed(slave,
4608 speed);
4609 else
4610 speed += slave->speed;
4611 }
4612 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4613 slave->duplex != DUPLEX_UNKNOWN)
4614 cmd->base.duplex = slave->duplex;
4615 }
4616 }
4617 cmd->base.speed = speed ? : SPEED_UNKNOWN;
4618
4619 return 0;
4620}
4621
4622static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4623 struct ethtool_drvinfo *drvinfo)
4624{
4625 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4626 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4627 BOND_ABI_VERSION);
4628}
4629
4630static const struct ethtool_ops bond_ethtool_ops = {
4631 .get_drvinfo = bond_ethtool_get_drvinfo,
4632 .get_link = ethtool_op_get_link,
4633 .get_link_ksettings = bond_ethtool_get_link_ksettings,
4634};
4635
4636static const struct net_device_ops bond_netdev_ops = {
4637 .ndo_init = bond_init,
4638 .ndo_uninit = bond_uninit,
4639 .ndo_open = bond_open,
4640 .ndo_stop = bond_close,
4641 .ndo_start_xmit = bond_start_xmit,
4642 .ndo_select_queue = bond_select_queue,
4643 .ndo_get_stats64 = bond_get_stats,
4644 .ndo_do_ioctl = bond_do_ioctl,
4645 .ndo_change_rx_flags = bond_change_rx_flags,
4646 .ndo_set_rx_mode = bond_set_rx_mode,
4647 .ndo_change_mtu = bond_change_mtu,
4648 .ndo_set_mac_address = bond_set_mac_address,
4649 .ndo_neigh_setup = bond_neigh_setup,
4650 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4651 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4652#ifdef CONFIG_NET_POLL_CONTROLLER
4653 .ndo_netpoll_setup = bond_netpoll_setup,
4654 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4655 .ndo_poll_controller = bond_poll_controller,
4656#endif
4657 .ndo_add_slave = bond_enslave,
4658 .ndo_del_slave = bond_release,
4659 .ndo_fix_features = bond_fix_features,
4660 .ndo_features_check = passthru_features_check,
4661 .ndo_get_xmit_slave = bond_xmit_get_slave,
4662};
4663
4664static const struct device_type bond_type = {
4665 .name = "bond",
4666};
4667
4668static void bond_destructor(struct net_device *bond_dev)
4669{
4670 struct bonding *bond = netdev_priv(bond_dev);
4671 if (bond->wq)
4672 destroy_workqueue(bond->wq);
4673}
4674
4675void bond_setup(struct net_device *bond_dev)
4676{
4677 struct bonding *bond = netdev_priv(bond_dev);
4678
4679 spin_lock_init(&bond->mode_lock);
4680 bond->params = bonding_defaults;
4681
4682 /* Initialize pointers */
4683 bond->dev = bond_dev;
4684
4685 /* Initialize the device entry points */
4686 ether_setup(bond_dev);
4687 bond_dev->max_mtu = ETH_MAX_MTU;
4688 bond_dev->netdev_ops = &bond_netdev_ops;
4689 bond_dev->ethtool_ops = &bond_ethtool_ops;
4690
4691 bond_dev->needs_free_netdev = true;
4692 bond_dev->priv_destructor = bond_destructor;
4693
4694 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4695
4696 /* Initialize the device options */
4697 bond_dev->flags |= IFF_MASTER;
4698 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4699 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4700
4701#ifdef CONFIG_XFRM_OFFLOAD
4702 /* set up xfrm device ops (only supported in active-backup right now) */
4703 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4704 bond->xs = NULL;
4705#endif /* CONFIG_XFRM_OFFLOAD */
4706
4707 /* don't acquire bond device's netif_tx_lock when transmitting */
4708 bond_dev->features |= NETIF_F_LLTX;
4709
4710 /* By default, we declare the bond to be fully
4711 * VLAN hardware accelerated capable. Special
4712 * care is taken in the various xmit functions
4713 * when there are slaves that are not hw accel
4714 * capable
4715 */
4716
4717 /* Don't allow bond devices to change network namespaces. */
4718 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4719
4720 bond_dev->hw_features = BOND_VLAN_FEATURES |
4721 NETIF_F_HW_VLAN_CTAG_RX |
4722 NETIF_F_HW_VLAN_CTAG_FILTER;
4723
4724 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4725#ifdef CONFIG_XFRM_OFFLOAD
4726 bond_dev->hw_features |= BOND_XFRM_FEATURES;
4727#endif /* CONFIG_XFRM_OFFLOAD */
4728 bond_dev->features |= bond_dev->hw_features;
4729 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4730#ifdef CONFIG_XFRM_OFFLOAD
4731 /* Disable XFRM features if this isn't an active-backup config */
4732 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
4733 bond_dev->features &= ~BOND_XFRM_FEATURES;
4734#endif /* CONFIG_XFRM_OFFLOAD */
4735}
4736
4737/* Destroy a bonding device.
4738 * Must be under rtnl_lock when this function is called.
4739 */
4740static void bond_uninit(struct net_device *bond_dev)
4741{
4742 struct bonding *bond = netdev_priv(bond_dev);
4743 struct bond_up_slave *usable, *all;
4744 struct list_head *iter;
4745 struct slave *slave;
4746
4747 bond_netpoll_cleanup(bond_dev);
4748
4749 /* Release the bonded slaves */
4750 bond_for_each_slave(bond, slave, iter)
4751 __bond_release_one(bond_dev, slave->dev, true, true);
4752 netdev_info(bond_dev, "Released all slaves\n");
4753
4754 usable = rtnl_dereference(bond->usable_slaves);
4755 if (usable) {
4756 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4757 kfree_rcu(usable, rcu);
4758 }
4759
4760 all = rtnl_dereference(bond->all_slaves);
4761 if (all) {
4762 RCU_INIT_POINTER(bond->all_slaves, NULL);
4763 kfree_rcu(all, rcu);
4764 }
4765
4766 list_del(&bond->bond_list);
4767
4768 bond_debug_unregister(bond);
4769}
4770
4771/*------------------------- Module initialization ---------------------------*/
4772
4773static int bond_check_params(struct bond_params *params)
4774{
4775 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4776 struct bond_opt_value newval;
4777 const struct bond_opt_value *valptr;
4778 int arp_all_targets_value = 0;
4779 u16 ad_actor_sys_prio = 0;
4780 u16 ad_user_port_key = 0;
4781 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4782 int arp_ip_count;
4783 int bond_mode = BOND_MODE_ROUNDROBIN;
4784 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4785 int lacp_fast = 0;
4786 int tlb_dynamic_lb;
4787
4788 /* Convert string parameters. */
4789 if (mode) {
4790 bond_opt_initstr(&newval, mode);
4791 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4792 if (!valptr) {
4793 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4794 return -EINVAL;
4795 }
4796 bond_mode = valptr->value;
4797 }
4798
4799 if (xmit_hash_policy) {
4800 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4801 bond_mode == BOND_MODE_ACTIVEBACKUP ||
4802 bond_mode == BOND_MODE_BROADCAST) {
4803 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4804 bond_mode_name(bond_mode));
4805 } else {
4806 bond_opt_initstr(&newval, xmit_hash_policy);
4807 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4808 &newval);
4809 if (!valptr) {
4810 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4811 xmit_hash_policy);
4812 return -EINVAL;
4813 }
4814 xmit_hashtype = valptr->value;
4815 }
4816 }
4817
4818 if (lacp_rate) {
4819 if (bond_mode != BOND_MODE_8023AD) {
4820 pr_info("lacp_rate param is irrelevant in mode %s\n",
4821 bond_mode_name(bond_mode));
4822 } else {
4823 bond_opt_initstr(&newval, lacp_rate);
4824 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4825 &newval);
4826 if (!valptr) {
4827 pr_err("Error: Invalid lacp rate \"%s\"\n",
4828 lacp_rate);
4829 return -EINVAL;
4830 }
4831 lacp_fast = valptr->value;
4832 }
4833 }
4834
4835 if (ad_select) {
4836 bond_opt_initstr(&newval, ad_select);
4837 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4838 &newval);
4839 if (!valptr) {
4840 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4841 return -EINVAL;
4842 }
4843 params->ad_select = valptr->value;
4844 if (bond_mode != BOND_MODE_8023AD)
4845 pr_warn("ad_select param only affects 802.3ad mode\n");
4846 } else {
4847 params->ad_select = BOND_AD_STABLE;
4848 }
4849
4850 if (max_bonds < 0) {
4851 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4852 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4853 max_bonds = BOND_DEFAULT_MAX_BONDS;
4854 }
4855
4856 if (miimon < 0) {
4857 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4858 miimon, INT_MAX);
4859 miimon = 0;
4860 }
4861
4862 if (updelay < 0) {
4863 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4864 updelay, INT_MAX);
4865 updelay = 0;
4866 }
4867
4868 if (downdelay < 0) {
4869 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4870 downdelay, INT_MAX);
4871 downdelay = 0;
4872 }
4873
4874 if ((use_carrier != 0) && (use_carrier != 1)) {
4875 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4876 use_carrier);
4877 use_carrier = 1;
4878 }
4879
4880 if (num_peer_notif < 0 || num_peer_notif > 255) {
4881 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4882 num_peer_notif);
4883 num_peer_notif = 1;
4884 }
4885
4886 /* reset values for 802.3ad/TLB/ALB */
4887 if (!bond_mode_uses_arp(bond_mode)) {
4888 if (!miimon) {
4889 pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4890 pr_warn("Forcing miimon to 100msec\n");
4891 miimon = BOND_DEFAULT_MIIMON;
4892 }
4893 }
4894
4895 if (tx_queues < 1 || tx_queues > 255) {
4896 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4897 tx_queues, BOND_DEFAULT_TX_QUEUES);
4898 tx_queues = BOND_DEFAULT_TX_QUEUES;
4899 }
4900
4901 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4902 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4903 all_slaves_active);
4904 all_slaves_active = 0;
4905 }
4906
4907 if (resend_igmp < 0 || resend_igmp > 255) {
4908 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4909 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4910 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4911 }
4912
4913 bond_opt_initval(&newval, packets_per_slave);
4914 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4915 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4916 packets_per_slave, USHRT_MAX);
4917 packets_per_slave = 1;
4918 }
4919
4920 if (bond_mode == BOND_MODE_ALB) {
4921 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",
4922 updelay);
4923 }
4924
4925 if (!miimon) {
4926 if (updelay || downdelay) {
4927 /* just warn the user the up/down delay will have
4928 * no effect since miimon is zero...
4929 */
4930 pr_warn("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",
4931 updelay, downdelay);
4932 }
4933 } else {
4934 /* don't allow arp monitoring */
4935 if (arp_interval) {
4936 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4937 miimon, arp_interval);
4938 arp_interval = 0;
4939 }
4940
4941 if ((updelay % miimon) != 0) {
4942 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4943 updelay, miimon, (updelay / miimon) * miimon);
4944 }
4945
4946 updelay /= miimon;
4947
4948 if ((downdelay % miimon) != 0) {
4949 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4950 downdelay, miimon,
4951 (downdelay / miimon) * miimon);
4952 }
4953
4954 downdelay /= miimon;
4955 }
4956
4957 if (arp_interval < 0) {
4958 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4959 arp_interval, INT_MAX);
4960 arp_interval = 0;
4961 }
4962
4963 for (arp_ip_count = 0, i = 0;
4964 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4965 __be32 ip;
4966
4967 /* not a complete check, but good enough to catch mistakes */
4968 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4969 !bond_is_ip_target_ok(ip)) {
4970 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4971 arp_ip_target[i]);
4972 arp_interval = 0;
4973 } else {
4974 if (bond_get_targets_ip(arp_target, ip) == -1)
4975 arp_target[arp_ip_count++] = ip;
4976 else
4977 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4978 &ip);
4979 }
4980 }
4981
4982 if (arp_interval && !arp_ip_count) {
4983 /* don't allow arping if no arp_ip_target given... */
4984 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4985 arp_interval);
4986 arp_interval = 0;
4987 }
4988
4989 if (arp_validate) {
4990 if (!arp_interval) {
4991 pr_err("arp_validate requires arp_interval\n");
4992 return -EINVAL;
4993 }
4994
4995 bond_opt_initstr(&newval, arp_validate);
4996 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4997 &newval);
4998 if (!valptr) {
4999 pr_err("Error: invalid arp_validate \"%s\"\n",
5000 arp_validate);
5001 return -EINVAL;
5002 }
5003 arp_validate_value = valptr->value;
5004 } else {
5005 arp_validate_value = 0;
5006 }
5007
5008 if (arp_all_targets) {
5009 bond_opt_initstr(&newval, arp_all_targets);
5010 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5011 &newval);
5012 if (!valptr) {
5013 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5014 arp_all_targets);
5015 arp_all_targets_value = 0;
5016 } else {
5017 arp_all_targets_value = valptr->value;
5018 }
5019 }
5020
5021 if (miimon) {
5022 pr_info("MII link monitoring set to %d ms\n", miimon);
5023 } else if (arp_interval) {
5024 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5025 arp_validate_value);
5026 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5027 arp_interval, valptr->string, arp_ip_count);
5028
5029 for (i = 0; i < arp_ip_count; i++)
5030 pr_cont(" %s", arp_ip_target[i]);
5031
5032 pr_cont("\n");
5033
5034 } else if (max_bonds) {
5035 /* miimon and arp_interval not set, we need one so things
5036 * work as expected, see bonding.txt for details
5037 */
5038 pr_debug("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");
5039 }
5040
5041 if (primary && !bond_mode_uses_primary(bond_mode)) {
5042 /* currently, using a primary only makes sense
5043 * in active backup, TLB or ALB modes
5044 */
5045 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5046 primary, bond_mode_name(bond_mode));
5047 primary = NULL;
5048 }
5049
5050 if (primary && primary_reselect) {
5051 bond_opt_initstr(&newval, primary_reselect);
5052 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5053 &newval);
5054 if (!valptr) {
5055 pr_err("Error: Invalid primary_reselect \"%s\"\n",
5056 primary_reselect);
5057 return -EINVAL;
5058 }
5059 primary_reselect_value = valptr->value;
5060 } else {
5061 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5062 }
5063
5064 if (fail_over_mac) {
5065 bond_opt_initstr(&newval, fail_over_mac);
5066 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5067 &newval);
5068 if (!valptr) {
5069 pr_err("Error: invalid fail_over_mac \"%s\"\n",
5070 fail_over_mac);
5071 return -EINVAL;
5072 }
5073 fail_over_mac_value = valptr->value;
5074 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5075 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5076 } else {
5077 fail_over_mac_value = BOND_FOM_NONE;
5078 }
5079
5080 bond_opt_initstr(&newval, "default");
5081 valptr = bond_opt_parse(
5082 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5083 &newval);
5084 if (!valptr) {
5085 pr_err("Error: No ad_actor_sys_prio default value");
5086 return -EINVAL;
5087 }
5088 ad_actor_sys_prio = valptr->value;
5089
5090 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5091 &newval);
5092 if (!valptr) {
5093 pr_err("Error: No ad_user_port_key default value");
5094 return -EINVAL;
5095 }
5096 ad_user_port_key = valptr->value;
5097
5098 bond_opt_initstr(&newval, "default");
5099 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5100 if (!valptr) {
5101 pr_err("Error: No tlb_dynamic_lb default value");
5102 return -EINVAL;
5103 }
5104 tlb_dynamic_lb = valptr->value;
5105
5106 if (lp_interval == 0) {
5107 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5108 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5109 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5110 }
5111
5112 /* fill params struct with the proper values */
5113 params->mode = bond_mode;
5114 params->xmit_policy = xmit_hashtype;
5115 params->miimon = miimon;
5116 params->num_peer_notif = num_peer_notif;
5117 params->arp_interval = arp_interval;
5118 params->arp_validate = arp_validate_value;
5119 params->arp_all_targets = arp_all_targets_value;
5120 params->updelay = updelay;
5121 params->downdelay = downdelay;
5122 params->peer_notif_delay = 0;
5123 params->use_carrier = use_carrier;
5124 params->lacp_fast = lacp_fast;
5125 params->primary[0] = 0;
5126 params->primary_reselect = primary_reselect_value;
5127 params->fail_over_mac = fail_over_mac_value;
5128 params->tx_queues = tx_queues;
5129 params->all_slaves_active = all_slaves_active;
5130 params->resend_igmp = resend_igmp;
5131 params->min_links = min_links;
5132 params->lp_interval = lp_interval;
5133 params->packets_per_slave = packets_per_slave;
5134 params->tlb_dynamic_lb = tlb_dynamic_lb;
5135 params->ad_actor_sys_prio = ad_actor_sys_prio;
5136 eth_zero_addr(params->ad_actor_system);
5137 params->ad_user_port_key = ad_user_port_key;
5138 if (packets_per_slave > 0) {
5139 params->reciprocal_packets_per_slave =
5140 reciprocal_value(packets_per_slave);
5141 } else {
5142 /* reciprocal_packets_per_slave is unused if
5143 * packets_per_slave is 0 or 1, just initialize it
5144 */
5145 params->reciprocal_packets_per_slave =
5146 (struct reciprocal_value) { 0 };
5147 }
5148
5149 if (primary) {
5150 strncpy(params->primary, primary, IFNAMSIZ);
5151 params->primary[IFNAMSIZ - 1] = 0;
5152 }
5153
5154 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5155
5156 return 0;
5157}
5158
5159/* Called from registration process */
5160static int bond_init(struct net_device *bond_dev)
5161{
5162 struct bonding *bond = netdev_priv(bond_dev);
5163 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5164
5165 netdev_dbg(bond_dev, "Begin bond_init\n");
5166
5167 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5168 if (!bond->wq)
5169 return -ENOMEM;
5170
5171 spin_lock_init(&bond->stats_lock);
5172 netdev_lockdep_set_classes(bond_dev);
5173
5174 list_add_tail(&bond->bond_list, &bn->dev_list);
5175
5176 bond_prepare_sysfs_group(bond);
5177
5178 bond_debug_register(bond);
5179
5180 /* Ensure valid dev_addr */
5181 if (is_zero_ether_addr(bond_dev->dev_addr) &&
5182 bond_dev->addr_assign_type == NET_ADDR_PERM)
5183 eth_hw_addr_random(bond_dev);
5184
5185 return 0;
5186}
5187
5188unsigned int bond_get_num_tx_queues(void)
5189{
5190 return tx_queues;
5191}
5192
5193/* Create a new bond based on the specified name and bonding parameters.
5194 * If name is NULL, obtain a suitable "bond%d" name for us.
5195 * Caller must NOT hold rtnl_lock; we need to release it here before we
5196 * set up our sysfs entries.
5197 */
5198int bond_create(struct net *net, const char *name)
5199{
5200 struct net_device *bond_dev;
5201 struct bonding *bond;
5202 struct alb_bond_info *bond_info;
5203 int res;
5204
5205 rtnl_lock();
5206
5207 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5208 name ? name : "bond%d", NET_NAME_UNKNOWN,
5209 bond_setup, tx_queues);
5210 if (!bond_dev) {
5211 pr_err("%s: eek! can't alloc netdev!\n", name);
5212 rtnl_unlock();
5213 return -ENOMEM;
5214 }
5215
5216 /*
5217 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5218 * It is set to 0 by default which is wrong.
5219 */
5220 bond = netdev_priv(bond_dev);
5221 bond_info = &(BOND_ALB_INFO(bond));
5222 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5223
5224 dev_net_set(bond_dev, net);
5225 bond_dev->rtnl_link_ops = &bond_link_ops;
5226
5227 res = register_netdevice(bond_dev);
5228 if (res < 0) {
5229 free_netdev(bond_dev);
5230 rtnl_unlock();
5231
5232 return res;
5233 }
5234
5235 netif_carrier_off(bond_dev);
5236
5237 bond_work_init_all(bond);
5238
5239 rtnl_unlock();
5240 return 0;
5241}
5242
5243static int __net_init bond_net_init(struct net *net)
5244{
5245 struct bond_net *bn = net_generic(net, bond_net_id);
5246
5247 bn->net = net;
5248 INIT_LIST_HEAD(&bn->dev_list);
5249
5250 bond_create_proc_dir(bn);
5251 bond_create_sysfs(bn);
5252
5253 return 0;
5254}
5255
5256static void __net_exit bond_net_exit(struct net *net)
5257{
5258 struct bond_net *bn = net_generic(net, bond_net_id);
5259 struct bonding *bond, *tmp_bond;
5260 LIST_HEAD(list);
5261
5262 bond_destroy_sysfs(bn);
5263
5264 /* Kill off any bonds created after unregistering bond rtnl ops */
5265 rtnl_lock();
5266 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5267 unregister_netdevice_queue(bond->dev, &list);
5268 unregister_netdevice_many(&list);
5269 rtnl_unlock();
5270
5271 bond_destroy_proc_dir(bn);
5272}
5273
5274static struct pernet_operations bond_net_ops = {
5275 .init = bond_net_init,
5276 .exit = bond_net_exit,
5277 .id = &bond_net_id,
5278 .size = sizeof(struct bond_net),
5279};
5280
5281static int __init bonding_init(void)
5282{
5283 int i;
5284 int res;
5285
5286 res = bond_check_params(&bonding_defaults);
5287 if (res)
5288 goto out;
5289
5290 res = register_pernet_subsys(&bond_net_ops);
5291 if (res)
5292 goto out;
5293
5294 res = bond_netlink_init();
5295 if (res)
5296 goto err_link;
5297
5298 bond_create_debugfs();
5299
5300 for (i = 0; i < max_bonds; i++) {
5301 res = bond_create(&init_net, NULL);
5302 if (res)
5303 goto err;
5304 }
5305
5306 skb_flow_dissector_init(&flow_keys_bonding,
5307 flow_keys_bonding_keys,
5308 ARRAY_SIZE(flow_keys_bonding_keys));
5309
5310 register_netdevice_notifier(&bond_netdev_notifier);
5311out:
5312 return res;
5313err:
5314 bond_destroy_debugfs();
5315 bond_netlink_fini();
5316err_link:
5317 unregister_pernet_subsys(&bond_net_ops);
5318 goto out;
5319
5320}
5321
5322static void __exit bonding_exit(void)
5323{
5324 unregister_netdevice_notifier(&bond_netdev_notifier);
5325
5326 bond_destroy_debugfs();
5327
5328 bond_netlink_fini();
5329 unregister_pernet_subsys(&bond_net_ops);
5330
5331#ifdef CONFIG_NET_POLL_CONTROLLER
5332 /* Make sure we don't have an imbalance on our netpoll blocking */
5333 WARN_ON(atomic_read(&netpoll_block_tx));
5334#endif
5335}
5336
5337module_init(bonding_init);
5338module_exit(bonding_exit);
5339MODULE_LICENSE("GPL");
5340MODULE_DESCRIPTION(DRV_DESCRIPTION);
5341MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");