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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#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/types.h>
37#include <linux/fcntl.h>
38#include <linux/interrupt.h>
39#include <linux/ptrace.h>
40#include <linux/ioport.h>
41#include <linux/in.h>
42#include <net/ip.h>
43#include <linux/ip.h>
44#include <linux/tcp.h>
45#include <linux/udp.h>
46#include <linux/slab.h>
47#include <linux/string.h>
48#include <linux/init.h>
49#include <linux/timer.h>
50#include <linux/socket.h>
51#include <linux/ctype.h>
52#include <linux/inet.h>
53#include <linux/bitops.h>
54#include <linux/io.h>
55#include <asm/dma.h>
56#include <linux/uaccess.h>
57#include <linux/errno.h>
58#include <linux/netdevice.h>
59#include <linux/inetdevice.h>
60#include <linux/igmp.h>
61#include <linux/etherdevice.h>
62#include <linux/skbuff.h>
63#include <net/sock.h>
64#include <linux/rtnetlink.h>
65#include <linux/smp.h>
66#include <linux/if_ether.h>
67#include <net/arp.h>
68#include <linux/mii.h>
69#include <linux/ethtool.h>
70#include <linux/if_vlan.h>
71#include <linux/if_bonding.h>
72#include <linux/jiffies.h>
73#include <linux/preempt.h>
74#include <net/route.h>
75#include <net/net_namespace.h>
76#include <net/netns/generic.h>
77#include <net/pkt_sched.h>
78#include <linux/rculist.h>
79#include <net/flow_dissector.h>
80#include <net/bonding.h>
81#include <net/bond_3ad.h>
82#include <net/bond_alb.h>
83
84#include "bonding_priv.h"
85
86/*---------------------------- Module parameters ----------------------------*/
87
88/* monitor all links that often (in milliseconds). <=0 disables monitoring */
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;
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;
105static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106static char *arp_validate;
107static char *arp_all_targets;
108static char *fail_over_mac;
109static int all_slaves_active;
110static struct bond_params bonding_defaults;
111static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112static int packets_per_slave = 1;
113static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
114
115module_param(max_bonds, int, 0);
116MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
117module_param(tx_queues, int, 0);
118MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
119module_param_named(num_grat_arp, num_peer_notif, int, 0644);
120MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
121 "failover event (alias of num_unsol_na)");
122module_param_named(num_unsol_na, num_peer_notif, int, 0644);
123MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
124 "failover event (alias of num_grat_arp)");
125module_param(miimon, int, 0);
126MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
127module_param(updelay, int, 0);
128MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
129module_param(downdelay, int, 0);
130MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
131 "in milliseconds");
132module_param(use_carrier, int, 0);
133MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
134 "0 for off, 1 for on (default)");
135module_param(mode, charp, 0);
136MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
137 "1 for active-backup, 2 for balance-xor, "
138 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
139 "6 for balance-alb");
140module_param(primary, charp, 0);
141MODULE_PARM_DESC(primary, "Primary network device to use");
142module_param(primary_reselect, charp, 0);
143MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
144 "once it comes up; "
145 "0 for always (default), "
146 "1 for only if speed of primary is "
147 "better, "
148 "2 for only on active slave "
149 "failure");
150module_param(lacp_rate, charp, 0);
151MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
152 "0 for slow, 1 for fast");
153module_param(ad_select, charp, 0);
154MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
155 "0 for stable (default), 1 for bandwidth, "
156 "2 for count");
157module_param(min_links, int, 0);
158MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
159
160module_param(xmit_hash_policy, charp, 0);
161MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
162 "0 for layer 2 (default), 1 for layer 3+4, "
163 "2 for layer 2+3, 3 for encap layer 2+3, "
164 "4 for encap layer 3+4");
165module_param(arp_interval, int, 0);
166MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
167module_param_array(arp_ip_target, charp, NULL, 0);
168MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
169module_param(arp_validate, charp, 0);
170MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
171 "0 for none (default), 1 for active, "
172 "2 for backup, 3 for all");
173module_param(arp_all_targets, charp, 0);
174MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
175module_param(fail_over_mac, charp, 0);
176MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
177 "the same MAC; 0 for none (default), "
178 "1 for active, 2 for follow");
179module_param(all_slaves_active, int, 0);
180MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
181 "by setting active flag for all slaves; "
182 "0 for never (default), 1 for always.");
183module_param(resend_igmp, int, 0);
184MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
185 "link failure");
186module_param(packets_per_slave, int, 0);
187MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
188 "mode; 0 for a random slave, 1 packet per "
189 "slave (default), >1 packets per slave.");
190module_param(lp_interval, uint, 0);
191MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
192 "the bonding driver sends learning packets to "
193 "each slaves peer switch. The default is 1.");
194
195/*----------------------------- Global variables ----------------------------*/
196
197#ifdef CONFIG_NET_POLL_CONTROLLER
198atomic_t netpoll_block_tx = ATOMIC_INIT(0);
199#endif
200
201unsigned int bond_net_id __read_mostly;
202
203/*-------------------------- Forward declarations ---------------------------*/
204
205static int bond_init(struct net_device *bond_dev);
206static void bond_uninit(struct net_device *bond_dev);
207static void bond_get_stats(struct net_device *bond_dev,
208 struct rtnl_link_stats64 *stats);
209static void bond_slave_arr_handler(struct work_struct *work);
210static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
211 int mod);
212static void bond_netdev_notify_work(struct work_struct *work);
213
214/*---------------------------- General routines -----------------------------*/
215
216const char *bond_mode_name(int mode)
217{
218 static const char *names[] = {
219 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
220 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
221 [BOND_MODE_XOR] = "load balancing (xor)",
222 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
223 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
224 [BOND_MODE_TLB] = "transmit load balancing",
225 [BOND_MODE_ALB] = "adaptive load balancing",
226 };
227
228 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
229 return "unknown";
230
231 return names[mode];
232}
233
234/*---------------------------------- VLAN -----------------------------------*/
235
236/**
237 * bond_dev_queue_xmit - Prepare skb for xmit.
238 *
239 * @bond: bond device that got this skb for tx.
240 * @skb: hw accel VLAN tagged skb to transmit
241 * @slave_dev: slave that is supposed to xmit this skbuff
242 */
243void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
244 struct net_device *slave_dev)
245{
246 skb->dev = slave_dev;
247
248 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
249 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
250 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
251
252 if (unlikely(netpoll_tx_running(bond->dev)))
253 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
254 else
255 dev_queue_xmit(skb);
256}
257
258/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
259 * We don't protect the slave list iteration with a lock because:
260 * a. This operation is performed in IOCTL context,
261 * b. The operation is protected by the RTNL semaphore in the 8021q code,
262 * c. Holding a lock with BH disabled while directly calling a base driver
263 * entry point is generally a BAD idea.
264 *
265 * The design of synchronization/protection for this operation in the 8021q
266 * module is good for one or more VLAN devices over a single physical device
267 * and cannot be extended for a teaming solution like bonding, so there is a
268 * potential race condition here where a net device from the vlan group might
269 * be referenced (either by a base driver or the 8021q code) while it is being
270 * removed from the system. However, it turns out we're not making matters
271 * worse, and if it works for regular VLAN usage it will work here too.
272*/
273
274/**
275 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
276 * @bond_dev: bonding net device that got called
277 * @vid: vlan id being added
278 */
279static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
280 __be16 proto, u16 vid)
281{
282 struct bonding *bond = netdev_priv(bond_dev);
283 struct slave *slave, *rollback_slave;
284 struct list_head *iter;
285 int res;
286
287 bond_for_each_slave(bond, slave, iter) {
288 res = vlan_vid_add(slave->dev, proto, vid);
289 if (res)
290 goto unwind;
291 }
292
293 return 0;
294
295unwind:
296 /* unwind to the slave that failed */
297 bond_for_each_slave(bond, rollback_slave, iter) {
298 if (rollback_slave == slave)
299 break;
300
301 vlan_vid_del(rollback_slave->dev, proto, vid);
302 }
303
304 return res;
305}
306
307/**
308 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
309 * @bond_dev: bonding net device that got called
310 * @vid: vlan id being removed
311 */
312static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
313 __be16 proto, u16 vid)
314{
315 struct bonding *bond = netdev_priv(bond_dev);
316 struct list_head *iter;
317 struct slave *slave;
318
319 bond_for_each_slave(bond, slave, iter)
320 vlan_vid_del(slave->dev, proto, vid);
321
322 if (bond_is_lb(bond))
323 bond_alb_clear_vlan(bond, vid);
324
325 return 0;
326}
327
328/*------------------------------- Link status -------------------------------*/
329
330/* Set the carrier state for the master according to the state of its
331 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
332 * do special 802.3ad magic.
333 *
334 * Returns zero if carrier state does not change, nonzero if it does.
335 */
336int bond_set_carrier(struct bonding *bond)
337{
338 struct list_head *iter;
339 struct slave *slave;
340
341 if (!bond_has_slaves(bond))
342 goto down;
343
344 if (BOND_MODE(bond) == BOND_MODE_8023AD)
345 return bond_3ad_set_carrier(bond);
346
347 bond_for_each_slave(bond, slave, iter) {
348 if (slave->link == BOND_LINK_UP) {
349 if (!netif_carrier_ok(bond->dev)) {
350 netif_carrier_on(bond->dev);
351 return 1;
352 }
353 return 0;
354 }
355 }
356
357down:
358 if (netif_carrier_ok(bond->dev)) {
359 netif_carrier_off(bond->dev);
360 return 1;
361 }
362 return 0;
363}
364
365/* Get link speed and duplex from the slave's base driver
366 * using ethtool. If for some reason the call fails or the
367 * values are invalid, set speed and duplex to -1,
368 * and return. Return 1 if speed or duplex settings are
369 * UNKNOWN; 0 otherwise.
370 */
371static int bond_update_speed_duplex(struct slave *slave)
372{
373 struct net_device *slave_dev = slave->dev;
374 struct ethtool_link_ksettings ecmd;
375 int res;
376
377 slave->speed = SPEED_UNKNOWN;
378 slave->duplex = DUPLEX_UNKNOWN;
379
380 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
381 if (res < 0)
382 return 1;
383 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
384 return 1;
385 switch (ecmd.base.duplex) {
386 case DUPLEX_FULL:
387 case DUPLEX_HALF:
388 break;
389 default:
390 return 1;
391 }
392
393 slave->speed = ecmd.base.speed;
394 slave->duplex = ecmd.base.duplex;
395
396 return 0;
397}
398
399const char *bond_slave_link_status(s8 link)
400{
401 switch (link) {
402 case BOND_LINK_UP:
403 return "up";
404 case BOND_LINK_FAIL:
405 return "going down";
406 case BOND_LINK_DOWN:
407 return "down";
408 case BOND_LINK_BACK:
409 return "going back";
410 default:
411 return "unknown";
412 }
413}
414
415/* if <dev> supports MII link status reporting, check its link status.
416 *
417 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
418 * depending upon the setting of the use_carrier parameter.
419 *
420 * Return either BMSR_LSTATUS, meaning that the link is up (or we
421 * can't tell and just pretend it is), or 0, meaning that the link is
422 * down.
423 *
424 * If reporting is non-zero, instead of faking link up, return -1 if
425 * both ETHTOOL and MII ioctls fail (meaning the device does not
426 * support them). If use_carrier is set, return whatever it says.
427 * It'd be nice if there was a good way to tell if a driver supports
428 * netif_carrier, but there really isn't.
429 */
430static int bond_check_dev_link(struct bonding *bond,
431 struct net_device *slave_dev, int reporting)
432{
433 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
434 int (*ioctl)(struct net_device *, struct ifreq *, int);
435 struct ifreq ifr;
436 struct mii_ioctl_data *mii;
437
438 if (!reporting && !netif_running(slave_dev))
439 return 0;
440
441 if (bond->params.use_carrier)
442 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
443
444 /* Try to get link status using Ethtool first. */
445 if (slave_dev->ethtool_ops->get_link)
446 return slave_dev->ethtool_ops->get_link(slave_dev) ?
447 BMSR_LSTATUS : 0;
448
449 /* Ethtool can't be used, fallback to MII ioctls. */
450 ioctl = slave_ops->ndo_do_ioctl;
451 if (ioctl) {
452 /* TODO: set pointer to correct ioctl on a per team member
453 * bases to make this more efficient. that is, once
454 * we determine the correct ioctl, we will always
455 * call it and not the others for that team
456 * member.
457 */
458
459 /* We cannot assume that SIOCGMIIPHY will also read a
460 * register; not all network drivers (e.g., e100)
461 * support that.
462 */
463
464 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
465 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
466 mii = if_mii(&ifr);
467 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
468 mii->reg_num = MII_BMSR;
469 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
470 return mii->val_out & BMSR_LSTATUS;
471 }
472 }
473
474 /* If reporting, report that either there's no dev->do_ioctl,
475 * or both SIOCGMIIREG and get_link failed (meaning that we
476 * cannot report link status). If not reporting, pretend
477 * we're ok.
478 */
479 return reporting ? -1 : BMSR_LSTATUS;
480}
481
482/*----------------------------- Multicast list ------------------------------*/
483
484/* Push the promiscuity flag down to appropriate slaves */
485static int bond_set_promiscuity(struct bonding *bond, int inc)
486{
487 struct list_head *iter;
488 int err = 0;
489
490 if (bond_uses_primary(bond)) {
491 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
492
493 if (curr_active)
494 err = dev_set_promiscuity(curr_active->dev, inc);
495 } else {
496 struct slave *slave;
497
498 bond_for_each_slave(bond, slave, iter) {
499 err = dev_set_promiscuity(slave->dev, inc);
500 if (err)
501 return err;
502 }
503 }
504 return err;
505}
506
507/* Push the allmulti flag down to all slaves */
508static int bond_set_allmulti(struct bonding *bond, int inc)
509{
510 struct list_head *iter;
511 int err = 0;
512
513 if (bond_uses_primary(bond)) {
514 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
515
516 if (curr_active)
517 err = dev_set_allmulti(curr_active->dev, inc);
518 } else {
519 struct slave *slave;
520
521 bond_for_each_slave(bond, slave, iter) {
522 err = dev_set_allmulti(slave->dev, inc);
523 if (err)
524 return err;
525 }
526 }
527 return err;
528}
529
530/* Retrieve the list of registered multicast addresses for the bonding
531 * device and retransmit an IGMP JOIN request to the current active
532 * slave.
533 */
534static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
535{
536 struct bonding *bond = container_of(work, struct bonding,
537 mcast_work.work);
538
539 if (!rtnl_trylock()) {
540 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
541 return;
542 }
543 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
544
545 if (bond->igmp_retrans > 1) {
546 bond->igmp_retrans--;
547 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
548 }
549 rtnl_unlock();
550}
551
552/* Flush bond's hardware addresses from slave */
553static void bond_hw_addr_flush(struct net_device *bond_dev,
554 struct net_device *slave_dev)
555{
556 struct bonding *bond = netdev_priv(bond_dev);
557
558 dev_uc_unsync(slave_dev, bond_dev);
559 dev_mc_unsync(slave_dev, bond_dev);
560
561 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
562 /* del lacpdu mc addr from mc list */
563 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
564
565 dev_mc_del(slave_dev, lacpdu_multicast);
566 }
567}
568
569/*--------------------------- Active slave change ---------------------------*/
570
571/* Update the hardware address list and promisc/allmulti for the new and
572 * old active slaves (if any). Modes that are not using primary keep all
573 * slaves up date at all times; only the modes that use primary need to call
574 * this function to swap these settings during a failover.
575 */
576static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
577 struct slave *old_active)
578{
579 if (old_active) {
580 if (bond->dev->flags & IFF_PROMISC)
581 dev_set_promiscuity(old_active->dev, -1);
582
583 if (bond->dev->flags & IFF_ALLMULTI)
584 dev_set_allmulti(old_active->dev, -1);
585
586 bond_hw_addr_flush(bond->dev, old_active->dev);
587 }
588
589 if (new_active) {
590 /* FIXME: Signal errors upstream. */
591 if (bond->dev->flags & IFF_PROMISC)
592 dev_set_promiscuity(new_active->dev, 1);
593
594 if (bond->dev->flags & IFF_ALLMULTI)
595 dev_set_allmulti(new_active->dev, 1);
596
597 netif_addr_lock_bh(bond->dev);
598 dev_uc_sync(new_active->dev, bond->dev);
599 dev_mc_sync(new_active->dev, bond->dev);
600 netif_addr_unlock_bh(bond->dev);
601 }
602}
603
604/**
605 * bond_set_dev_addr - clone slave's address to bond
606 * @bond_dev: bond net device
607 * @slave_dev: slave net device
608 *
609 * Should be called with RTNL held.
610 */
611static int bond_set_dev_addr(struct net_device *bond_dev,
612 struct net_device *slave_dev)
613{
614 int err;
615
616 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
617 bond_dev, slave_dev, slave_dev->addr_len);
618 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
619 if (err)
620 return err;
621
622 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
623 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
624 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
625 return 0;
626}
627
628static struct slave *bond_get_old_active(struct bonding *bond,
629 struct slave *new_active)
630{
631 struct slave *slave;
632 struct list_head *iter;
633
634 bond_for_each_slave(bond, slave, iter) {
635 if (slave == new_active)
636 continue;
637
638 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
639 return slave;
640 }
641
642 return NULL;
643}
644
645/* bond_do_fail_over_mac
646 *
647 * Perform special MAC address swapping for fail_over_mac settings
648 *
649 * Called with RTNL
650 */
651static void bond_do_fail_over_mac(struct bonding *bond,
652 struct slave *new_active,
653 struct slave *old_active)
654{
655 u8 tmp_mac[MAX_ADDR_LEN];
656 struct sockaddr_storage ss;
657 int rv;
658
659 switch (bond->params.fail_over_mac) {
660 case BOND_FOM_ACTIVE:
661 if (new_active) {
662 rv = bond_set_dev_addr(bond->dev, new_active->dev);
663 if (rv)
664 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
665 -rv);
666 }
667 break;
668 case BOND_FOM_FOLLOW:
669 /* if new_active && old_active, swap them
670 * if just old_active, do nothing (going to no active slave)
671 * if just new_active, set new_active to bond's MAC
672 */
673 if (!new_active)
674 return;
675
676 if (!old_active)
677 old_active = bond_get_old_active(bond, new_active);
678
679 if (old_active) {
680 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
681 new_active->dev->addr_len);
682 bond_hw_addr_copy(ss.__data,
683 old_active->dev->dev_addr,
684 old_active->dev->addr_len);
685 ss.ss_family = new_active->dev->type;
686 } else {
687 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
688 bond->dev->addr_len);
689 ss.ss_family = bond->dev->type;
690 }
691
692 rv = dev_set_mac_address(new_active->dev,
693 (struct sockaddr *)&ss, NULL);
694 if (rv) {
695 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
696 -rv);
697 goto out;
698 }
699
700 if (!old_active)
701 goto out;
702
703 bond_hw_addr_copy(ss.__data, tmp_mac,
704 new_active->dev->addr_len);
705 ss.ss_family = old_active->dev->type;
706
707 rv = dev_set_mac_address(old_active->dev,
708 (struct sockaddr *)&ss, NULL);
709 if (rv)
710 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
711 -rv);
712out:
713 break;
714 default:
715 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
716 bond->params.fail_over_mac);
717 break;
718 }
719
720}
721
722static struct slave *bond_choose_primary_or_current(struct bonding *bond)
723{
724 struct slave *prim = rtnl_dereference(bond->primary_slave);
725 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
726
727 if (!prim || prim->link != BOND_LINK_UP) {
728 if (!curr || curr->link != BOND_LINK_UP)
729 return NULL;
730 return curr;
731 }
732
733 if (bond->force_primary) {
734 bond->force_primary = false;
735 return prim;
736 }
737
738 if (!curr || curr->link != BOND_LINK_UP)
739 return prim;
740
741 /* At this point, prim and curr are both up */
742 switch (bond->params.primary_reselect) {
743 case BOND_PRI_RESELECT_ALWAYS:
744 return prim;
745 case BOND_PRI_RESELECT_BETTER:
746 if (prim->speed < curr->speed)
747 return curr;
748 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
749 return curr;
750 return prim;
751 case BOND_PRI_RESELECT_FAILURE:
752 return curr;
753 default:
754 netdev_err(bond->dev, "impossible primary_reselect %d\n",
755 bond->params.primary_reselect);
756 return curr;
757 }
758}
759
760/**
761 * bond_find_best_slave - select the best available slave to be the active one
762 * @bond: our bonding struct
763 */
764static struct slave *bond_find_best_slave(struct bonding *bond)
765{
766 struct slave *slave, *bestslave = NULL;
767 struct list_head *iter;
768 int mintime = bond->params.updelay;
769
770 slave = bond_choose_primary_or_current(bond);
771 if (slave)
772 return slave;
773
774 bond_for_each_slave(bond, slave, iter) {
775 if (slave->link == BOND_LINK_UP)
776 return slave;
777 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
778 slave->delay < mintime) {
779 mintime = slave->delay;
780 bestslave = slave;
781 }
782 }
783
784 return bestslave;
785}
786
787static bool bond_should_notify_peers(struct bonding *bond)
788{
789 struct slave *slave;
790
791 rcu_read_lock();
792 slave = rcu_dereference(bond->curr_active_slave);
793 rcu_read_unlock();
794
795 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
796 slave ? slave->dev->name : "NULL");
797
798 if (!slave || !bond->send_peer_notif ||
799 bond->send_peer_notif %
800 max(1, bond->params.peer_notif_delay) != 0 ||
801 !netif_carrier_ok(bond->dev) ||
802 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
803 return false;
804
805 return true;
806}
807
808/**
809 * change_active_interface - change the active slave into the specified one
810 * @bond: our bonding struct
811 * @new: the new slave to make the active one
812 *
813 * Set the new slave to the bond's settings and unset them on the old
814 * curr_active_slave.
815 * Setting include flags, mc-list, promiscuity, allmulti, etc.
816 *
817 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
818 * because it is apparently the best available slave we have, even though its
819 * updelay hasn't timed out yet.
820 *
821 * Caller must hold RTNL.
822 */
823void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
824{
825 struct slave *old_active;
826
827 ASSERT_RTNL();
828
829 old_active = rtnl_dereference(bond->curr_active_slave);
830
831 if (old_active == new_active)
832 return;
833
834 if (new_active) {
835 new_active->last_link_up = jiffies;
836
837 if (new_active->link == BOND_LINK_BACK) {
838 if (bond_uses_primary(bond)) {
839 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
840 (bond->params.updelay - new_active->delay) * bond->params.miimon);
841 }
842
843 new_active->delay = 0;
844 bond_set_slave_link_state(new_active, BOND_LINK_UP,
845 BOND_SLAVE_NOTIFY_NOW);
846
847 if (BOND_MODE(bond) == BOND_MODE_8023AD)
848 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
849
850 if (bond_is_lb(bond))
851 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
852 } else {
853 if (bond_uses_primary(bond)) {
854 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
855 }
856 }
857 }
858
859 if (bond_uses_primary(bond))
860 bond_hw_addr_swap(bond, new_active, old_active);
861
862 if (bond_is_lb(bond)) {
863 bond_alb_handle_active_change(bond, new_active);
864 if (old_active)
865 bond_set_slave_inactive_flags(old_active,
866 BOND_SLAVE_NOTIFY_NOW);
867 if (new_active)
868 bond_set_slave_active_flags(new_active,
869 BOND_SLAVE_NOTIFY_NOW);
870 } else {
871 rcu_assign_pointer(bond->curr_active_slave, new_active);
872 }
873
874 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
875 if (old_active)
876 bond_set_slave_inactive_flags(old_active,
877 BOND_SLAVE_NOTIFY_NOW);
878
879 if (new_active) {
880 bool should_notify_peers = false;
881
882 bond_set_slave_active_flags(new_active,
883 BOND_SLAVE_NOTIFY_NOW);
884
885 if (bond->params.fail_over_mac)
886 bond_do_fail_over_mac(bond, new_active,
887 old_active);
888
889 if (netif_running(bond->dev)) {
890 bond->send_peer_notif =
891 bond->params.num_peer_notif *
892 max(1, bond->params.peer_notif_delay);
893 should_notify_peers =
894 bond_should_notify_peers(bond);
895 }
896
897 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
898 if (should_notify_peers) {
899 bond->send_peer_notif--;
900 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
901 bond->dev);
902 }
903 }
904 }
905
906 /* resend IGMP joins since active slave has changed or
907 * all were sent on curr_active_slave.
908 * resend only if bond is brought up with the affected
909 * bonding modes and the retransmission is enabled
910 */
911 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
912 ((bond_uses_primary(bond) && new_active) ||
913 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
914 bond->igmp_retrans = bond->params.resend_igmp;
915 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
916 }
917}
918
919/**
920 * bond_select_active_slave - select a new active slave, if needed
921 * @bond: our bonding struct
922 *
923 * This functions should be called when one of the following occurs:
924 * - The old curr_active_slave has been released or lost its link.
925 * - The primary_slave has got its link back.
926 * - A slave has got its link back and there's no old curr_active_slave.
927 *
928 * Caller must hold RTNL.
929 */
930void bond_select_active_slave(struct bonding *bond)
931{
932 struct slave *best_slave;
933 int rv;
934
935 ASSERT_RTNL();
936
937 best_slave = bond_find_best_slave(bond);
938 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
939 bond_change_active_slave(bond, best_slave);
940 rv = bond_set_carrier(bond);
941 if (!rv)
942 return;
943
944 if (netif_carrier_ok(bond->dev))
945 netdev_info(bond->dev, "active interface up!\n");
946 else
947 netdev_info(bond->dev, "now running without any active interface!\n");
948 }
949}
950
951#ifdef CONFIG_NET_POLL_CONTROLLER
952static inline int slave_enable_netpoll(struct slave *slave)
953{
954 struct netpoll *np;
955 int err = 0;
956
957 np = kzalloc(sizeof(*np), GFP_KERNEL);
958 err = -ENOMEM;
959 if (!np)
960 goto out;
961
962 err = __netpoll_setup(np, slave->dev);
963 if (err) {
964 kfree(np);
965 goto out;
966 }
967 slave->np = np;
968out:
969 return err;
970}
971static inline void slave_disable_netpoll(struct slave *slave)
972{
973 struct netpoll *np = slave->np;
974
975 if (!np)
976 return;
977
978 slave->np = NULL;
979
980 __netpoll_free(np);
981}
982
983static void bond_poll_controller(struct net_device *bond_dev)
984{
985 struct bonding *bond = netdev_priv(bond_dev);
986 struct slave *slave = NULL;
987 struct list_head *iter;
988 struct ad_info ad_info;
989
990 if (BOND_MODE(bond) == BOND_MODE_8023AD)
991 if (bond_3ad_get_active_agg_info(bond, &ad_info))
992 return;
993
994 bond_for_each_slave_rcu(bond, slave, iter) {
995 if (!bond_slave_is_up(slave))
996 continue;
997
998 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
999 struct aggregator *agg =
1000 SLAVE_AD_INFO(slave)->port.aggregator;
1001
1002 if (agg &&
1003 agg->aggregator_identifier != ad_info.aggregator_id)
1004 continue;
1005 }
1006
1007 netpoll_poll_dev(slave->dev);
1008 }
1009}
1010
1011static void bond_netpoll_cleanup(struct net_device *bond_dev)
1012{
1013 struct bonding *bond = netdev_priv(bond_dev);
1014 struct list_head *iter;
1015 struct slave *slave;
1016
1017 bond_for_each_slave(bond, slave, iter)
1018 if (bond_slave_is_up(slave))
1019 slave_disable_netpoll(slave);
1020}
1021
1022static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1023{
1024 struct bonding *bond = netdev_priv(dev);
1025 struct list_head *iter;
1026 struct slave *slave;
1027 int err = 0;
1028
1029 bond_for_each_slave(bond, slave, iter) {
1030 err = slave_enable_netpoll(slave);
1031 if (err) {
1032 bond_netpoll_cleanup(dev);
1033 break;
1034 }
1035 }
1036 return err;
1037}
1038#else
1039static inline int slave_enable_netpoll(struct slave *slave)
1040{
1041 return 0;
1042}
1043static inline void slave_disable_netpoll(struct slave *slave)
1044{
1045}
1046static void bond_netpoll_cleanup(struct net_device *bond_dev)
1047{
1048}
1049#endif
1050
1051/*---------------------------------- IOCTL ----------------------------------*/
1052
1053static netdev_features_t bond_fix_features(struct net_device *dev,
1054 netdev_features_t features)
1055{
1056 struct bonding *bond = netdev_priv(dev);
1057 struct list_head *iter;
1058 netdev_features_t mask;
1059 struct slave *slave;
1060
1061 mask = features;
1062
1063 features &= ~NETIF_F_ONE_FOR_ALL;
1064 features |= NETIF_F_ALL_FOR_ALL;
1065
1066 bond_for_each_slave(bond, slave, iter) {
1067 features = netdev_increment_features(features,
1068 slave->dev->features,
1069 mask);
1070 }
1071 features = netdev_add_tso_features(features, mask);
1072
1073 return features;
1074}
1075
1076#define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1077 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1078 NETIF_F_HIGHDMA | NETIF_F_LRO)
1079
1080#define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1081 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1082
1083#define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1084 NETIF_F_ALL_TSO)
1085
1086static void bond_compute_features(struct bonding *bond)
1087{
1088 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1089 IFF_XMIT_DST_RELEASE_PERM;
1090 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1091 netdev_features_t enc_features = BOND_ENC_FEATURES;
1092 netdev_features_t mpls_features = BOND_MPLS_FEATURES;
1093 struct net_device *bond_dev = bond->dev;
1094 struct list_head *iter;
1095 struct slave *slave;
1096 unsigned short max_hard_header_len = ETH_HLEN;
1097 unsigned int gso_max_size = GSO_MAX_SIZE;
1098 u16 gso_max_segs = GSO_MAX_SEGS;
1099
1100 if (!bond_has_slaves(bond))
1101 goto done;
1102 vlan_features &= NETIF_F_ALL_FOR_ALL;
1103 mpls_features &= NETIF_F_ALL_FOR_ALL;
1104
1105 bond_for_each_slave(bond, slave, iter) {
1106 vlan_features = netdev_increment_features(vlan_features,
1107 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1108
1109 enc_features = netdev_increment_features(enc_features,
1110 slave->dev->hw_enc_features,
1111 BOND_ENC_FEATURES);
1112
1113 mpls_features = netdev_increment_features(mpls_features,
1114 slave->dev->mpls_features,
1115 BOND_MPLS_FEATURES);
1116
1117 dst_release_flag &= slave->dev->priv_flags;
1118 if (slave->dev->hard_header_len > max_hard_header_len)
1119 max_hard_header_len = slave->dev->hard_header_len;
1120
1121 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1122 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1123 }
1124 bond_dev->hard_header_len = max_hard_header_len;
1125
1126done:
1127 bond_dev->vlan_features = vlan_features;
1128 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1129 NETIF_F_HW_VLAN_CTAG_TX |
1130 NETIF_F_HW_VLAN_STAG_TX |
1131 NETIF_F_GSO_UDP_L4;
1132 bond_dev->mpls_features = mpls_features;
1133 bond_dev->gso_max_segs = gso_max_segs;
1134 netif_set_gso_max_size(bond_dev, gso_max_size);
1135
1136 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1137 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1138 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1139 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1140
1141 netdev_change_features(bond_dev);
1142}
1143
1144static void bond_setup_by_slave(struct net_device *bond_dev,
1145 struct net_device *slave_dev)
1146{
1147 bond_dev->header_ops = slave_dev->header_ops;
1148
1149 bond_dev->type = slave_dev->type;
1150 bond_dev->hard_header_len = slave_dev->hard_header_len;
1151 bond_dev->addr_len = slave_dev->addr_len;
1152
1153 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1154 slave_dev->addr_len);
1155}
1156
1157/* On bonding slaves other than the currently active slave, suppress
1158 * duplicates except for alb non-mcast/bcast.
1159 */
1160static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1161 struct slave *slave,
1162 struct bonding *bond)
1163{
1164 if (bond_is_slave_inactive(slave)) {
1165 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1166 skb->pkt_type != PACKET_BROADCAST &&
1167 skb->pkt_type != PACKET_MULTICAST)
1168 return false;
1169 return true;
1170 }
1171 return false;
1172}
1173
1174static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1175{
1176 struct sk_buff *skb = *pskb;
1177 struct slave *slave;
1178 struct bonding *bond;
1179 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1180 struct slave *);
1181 int ret = RX_HANDLER_ANOTHER;
1182
1183 skb = skb_share_check(skb, GFP_ATOMIC);
1184 if (unlikely(!skb))
1185 return RX_HANDLER_CONSUMED;
1186
1187 *pskb = skb;
1188
1189 slave = bond_slave_get_rcu(skb->dev);
1190 bond = slave->bond;
1191
1192 recv_probe = READ_ONCE(bond->recv_probe);
1193 if (recv_probe) {
1194 ret = recv_probe(skb, bond, slave);
1195 if (ret == RX_HANDLER_CONSUMED) {
1196 consume_skb(skb);
1197 return ret;
1198 }
1199 }
1200
1201 /*
1202 * For packets determined by bond_should_deliver_exact_match() call to
1203 * be suppressed we want to make an exception for link-local packets.
1204 * This is necessary for e.g. LLDP daemons to be able to monitor
1205 * inactive slave links without being forced to bind to them
1206 * explicitly.
1207 *
1208 * At the same time, packets that are passed to the bonding master
1209 * (including link-local ones) can have their originating interface
1210 * determined via PACKET_ORIGDEV socket option.
1211 */
1212 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1213 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1214 return RX_HANDLER_PASS;
1215 return RX_HANDLER_EXACT;
1216 }
1217
1218 skb->dev = bond->dev;
1219
1220 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1221 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1222 skb->pkt_type == PACKET_HOST) {
1223
1224 if (unlikely(skb_cow_head(skb,
1225 skb->data - skb_mac_header(skb)))) {
1226 kfree_skb(skb);
1227 return RX_HANDLER_CONSUMED;
1228 }
1229 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1230 bond->dev->addr_len);
1231 }
1232
1233 return ret;
1234}
1235
1236static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1237{
1238 switch (BOND_MODE(bond)) {
1239 case BOND_MODE_ROUNDROBIN:
1240 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1241 case BOND_MODE_ACTIVEBACKUP:
1242 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1243 case BOND_MODE_BROADCAST:
1244 return NETDEV_LAG_TX_TYPE_BROADCAST;
1245 case BOND_MODE_XOR:
1246 case BOND_MODE_8023AD:
1247 return NETDEV_LAG_TX_TYPE_HASH;
1248 default:
1249 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1250 }
1251}
1252
1253static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1254 enum netdev_lag_tx_type type)
1255{
1256 if (type != NETDEV_LAG_TX_TYPE_HASH)
1257 return NETDEV_LAG_HASH_NONE;
1258
1259 switch (bond->params.xmit_policy) {
1260 case BOND_XMIT_POLICY_LAYER2:
1261 return NETDEV_LAG_HASH_L2;
1262 case BOND_XMIT_POLICY_LAYER34:
1263 return NETDEV_LAG_HASH_L34;
1264 case BOND_XMIT_POLICY_LAYER23:
1265 return NETDEV_LAG_HASH_L23;
1266 case BOND_XMIT_POLICY_ENCAP23:
1267 return NETDEV_LAG_HASH_E23;
1268 case BOND_XMIT_POLICY_ENCAP34:
1269 return NETDEV_LAG_HASH_E34;
1270 default:
1271 return NETDEV_LAG_HASH_UNKNOWN;
1272 }
1273}
1274
1275static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1276 struct netlink_ext_ack *extack)
1277{
1278 struct netdev_lag_upper_info lag_upper_info;
1279 enum netdev_lag_tx_type type;
1280
1281 type = bond_lag_tx_type(bond);
1282 lag_upper_info.tx_type = type;
1283 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1284
1285 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1286 &lag_upper_info, extack);
1287}
1288
1289static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1290{
1291 netdev_upper_dev_unlink(slave->dev, bond->dev);
1292 slave->dev->flags &= ~IFF_SLAVE;
1293}
1294
1295static struct slave *bond_alloc_slave(struct bonding *bond)
1296{
1297 struct slave *slave = NULL;
1298
1299 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1300 if (!slave)
1301 return NULL;
1302
1303 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1304 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1305 GFP_KERNEL);
1306 if (!SLAVE_AD_INFO(slave)) {
1307 kfree(slave);
1308 return NULL;
1309 }
1310 }
1311 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1312
1313 return slave;
1314}
1315
1316static void bond_free_slave(struct slave *slave)
1317{
1318 struct bonding *bond = bond_get_bond_by_slave(slave);
1319
1320 cancel_delayed_work_sync(&slave->notify_work);
1321 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1322 kfree(SLAVE_AD_INFO(slave));
1323
1324 kfree(slave);
1325}
1326
1327static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1328{
1329 info->bond_mode = BOND_MODE(bond);
1330 info->miimon = bond->params.miimon;
1331 info->num_slaves = bond->slave_cnt;
1332}
1333
1334static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1335{
1336 strcpy(info->slave_name, slave->dev->name);
1337 info->link = slave->link;
1338 info->state = bond_slave_state(slave);
1339 info->link_failure_count = slave->link_failure_count;
1340}
1341
1342static void bond_netdev_notify_work(struct work_struct *_work)
1343{
1344 struct slave *slave = container_of(_work, struct slave,
1345 notify_work.work);
1346
1347 if (rtnl_trylock()) {
1348 struct netdev_bonding_info binfo;
1349
1350 bond_fill_ifslave(slave, &binfo.slave);
1351 bond_fill_ifbond(slave->bond, &binfo.master);
1352 netdev_bonding_info_change(slave->dev, &binfo);
1353 rtnl_unlock();
1354 } else {
1355 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1356 }
1357}
1358
1359void bond_queue_slave_event(struct slave *slave)
1360{
1361 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1362}
1363
1364void bond_lower_state_changed(struct slave *slave)
1365{
1366 struct netdev_lag_lower_state_info info;
1367
1368 info.link_up = slave->link == BOND_LINK_UP ||
1369 slave->link == BOND_LINK_FAIL;
1370 info.tx_enabled = bond_is_active_slave(slave);
1371 netdev_lower_state_changed(slave->dev, &info);
1372}
1373
1374/* enslave device <slave> to bond device <master> */
1375int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1376 struct netlink_ext_ack *extack)
1377{
1378 struct bonding *bond = netdev_priv(bond_dev);
1379 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1380 struct slave *new_slave = NULL, *prev_slave;
1381 struct sockaddr_storage ss;
1382 int link_reporting;
1383 int res = 0, i;
1384
1385 if (!bond->params.use_carrier &&
1386 slave_dev->ethtool_ops->get_link == NULL &&
1387 slave_ops->ndo_do_ioctl == NULL) {
1388 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1389 }
1390
1391 /* already in-use? */
1392 if (netdev_is_rx_handler_busy(slave_dev)) {
1393 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1394 slave_err(bond_dev, slave_dev,
1395 "Error: Device is in use and cannot be enslaved\n");
1396 return -EBUSY;
1397 }
1398
1399 if (bond_dev == slave_dev) {
1400 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1401 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1402 return -EPERM;
1403 }
1404
1405 /* vlan challenged mutual exclusion */
1406 /* no need to lock since we're protected by rtnl_lock */
1407 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1408 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1409 if (vlan_uses_dev(bond_dev)) {
1410 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1411 slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1412 return -EPERM;
1413 } else {
1414 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1415 }
1416 } else {
1417 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1418 }
1419
1420 /* Old ifenslave binaries are no longer supported. These can
1421 * be identified with moderate accuracy by the state of the slave:
1422 * the current ifenslave will set the interface down prior to
1423 * enslaving it; the old ifenslave will not.
1424 */
1425 if (slave_dev->flags & IFF_UP) {
1426 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1427 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1428 return -EPERM;
1429 }
1430
1431 /* set bonding device ether type by slave - bonding netdevices are
1432 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1433 * there is a need to override some of the type dependent attribs/funcs.
1434 *
1435 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1436 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1437 */
1438 if (!bond_has_slaves(bond)) {
1439 if (bond_dev->type != slave_dev->type) {
1440 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1441 bond_dev->type, slave_dev->type);
1442
1443 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1444 bond_dev);
1445 res = notifier_to_errno(res);
1446 if (res) {
1447 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1448 return -EBUSY;
1449 }
1450
1451 /* Flush unicast and multicast addresses */
1452 dev_uc_flush(bond_dev);
1453 dev_mc_flush(bond_dev);
1454
1455 if (slave_dev->type != ARPHRD_ETHER)
1456 bond_setup_by_slave(bond_dev, slave_dev);
1457 else {
1458 ether_setup(bond_dev);
1459 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1460 }
1461
1462 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1463 bond_dev);
1464 }
1465 } else if (bond_dev->type != slave_dev->type) {
1466 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1467 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1468 slave_dev->type, bond_dev->type);
1469 return -EINVAL;
1470 }
1471
1472 if (slave_dev->type == ARPHRD_INFINIBAND &&
1473 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1474 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1475 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1476 slave_dev->type);
1477 res = -EOPNOTSUPP;
1478 goto err_undo_flags;
1479 }
1480
1481 if (!slave_ops->ndo_set_mac_address ||
1482 slave_dev->type == ARPHRD_INFINIBAND) {
1483 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1484 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1485 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1486 if (!bond_has_slaves(bond)) {
1487 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1488 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1489 } else {
1490 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1491 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");
1492 res = -EOPNOTSUPP;
1493 goto err_undo_flags;
1494 }
1495 }
1496 }
1497
1498 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1499
1500 /* If this is the first slave, then we need to set the master's hardware
1501 * address to be the same as the slave's.
1502 */
1503 if (!bond_has_slaves(bond) &&
1504 bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1505 res = bond_set_dev_addr(bond->dev, slave_dev);
1506 if (res)
1507 goto err_undo_flags;
1508 }
1509
1510 new_slave = bond_alloc_slave(bond);
1511 if (!new_slave) {
1512 res = -ENOMEM;
1513 goto err_undo_flags;
1514 }
1515
1516 new_slave->bond = bond;
1517 new_slave->dev = slave_dev;
1518 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1519 * is set via sysfs or module option if desired.
1520 */
1521 new_slave->queue_id = 0;
1522
1523 /* Save slave's original mtu and then set it to match the bond */
1524 new_slave->original_mtu = slave_dev->mtu;
1525 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1526 if (res) {
1527 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1528 goto err_free;
1529 }
1530
1531 /* Save slave's original ("permanent") mac address for modes
1532 * that need it, and for restoring it upon release, and then
1533 * set it to the master's address
1534 */
1535 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1536 slave_dev->addr_len);
1537
1538 if (!bond->params.fail_over_mac ||
1539 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1540 /* Set slave to master's mac address. The application already
1541 * set the master's mac address to that of the first slave
1542 */
1543 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1544 ss.ss_family = slave_dev->type;
1545 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1546 extack);
1547 if (res) {
1548 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1549 goto err_restore_mtu;
1550 }
1551 }
1552
1553 /* set slave flag before open to prevent IPv6 addrconf */
1554 slave_dev->flags |= IFF_SLAVE;
1555
1556 /* open the slave since the application closed it */
1557 res = dev_open(slave_dev, extack);
1558 if (res) {
1559 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1560 goto err_restore_mac;
1561 }
1562
1563 slave_dev->priv_flags |= IFF_BONDING;
1564 /* initialize slave stats */
1565 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1566
1567 if (bond_is_lb(bond)) {
1568 /* bond_alb_init_slave() must be called before all other stages since
1569 * it might fail and we do not want to have to undo everything
1570 */
1571 res = bond_alb_init_slave(bond, new_slave);
1572 if (res)
1573 goto err_close;
1574 }
1575
1576 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1577 if (res) {
1578 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1579 goto err_close;
1580 }
1581
1582 prev_slave = bond_last_slave(bond);
1583
1584 new_slave->delay = 0;
1585 new_slave->link_failure_count = 0;
1586
1587 if (bond_update_speed_duplex(new_slave) &&
1588 bond_needs_speed_duplex(bond))
1589 new_slave->link = BOND_LINK_DOWN;
1590
1591 new_slave->last_rx = jiffies -
1592 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1593 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1594 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1595
1596 if (bond->params.miimon && !bond->params.use_carrier) {
1597 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1598
1599 if ((link_reporting == -1) && !bond->params.arp_interval) {
1600 /* miimon is set but a bonded network driver
1601 * does not support ETHTOOL/MII and
1602 * arp_interval is not set. Note: if
1603 * use_carrier is enabled, we will never go
1604 * here (because netif_carrier is always
1605 * supported); thus, we don't need to change
1606 * the messages for netif_carrier.
1607 */
1608 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");
1609 } else if (link_reporting == -1) {
1610 /* unable get link status using mii/ethtool */
1611 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");
1612 }
1613 }
1614
1615 /* check for initial state */
1616 new_slave->link = BOND_LINK_NOCHANGE;
1617 if (bond->params.miimon) {
1618 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1619 if (bond->params.updelay) {
1620 bond_set_slave_link_state(new_slave,
1621 BOND_LINK_BACK,
1622 BOND_SLAVE_NOTIFY_NOW);
1623 new_slave->delay = bond->params.updelay;
1624 } else {
1625 bond_set_slave_link_state(new_slave,
1626 BOND_LINK_UP,
1627 BOND_SLAVE_NOTIFY_NOW);
1628 }
1629 } else {
1630 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1631 BOND_SLAVE_NOTIFY_NOW);
1632 }
1633 } else if (bond->params.arp_interval) {
1634 bond_set_slave_link_state(new_slave,
1635 (netif_carrier_ok(slave_dev) ?
1636 BOND_LINK_UP : BOND_LINK_DOWN),
1637 BOND_SLAVE_NOTIFY_NOW);
1638 } else {
1639 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1640 BOND_SLAVE_NOTIFY_NOW);
1641 }
1642
1643 if (new_slave->link != BOND_LINK_DOWN)
1644 new_slave->last_link_up = jiffies;
1645 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1646 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1647 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1648
1649 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1650 /* if there is a primary slave, remember it */
1651 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1652 rcu_assign_pointer(bond->primary_slave, new_slave);
1653 bond->force_primary = true;
1654 }
1655 }
1656
1657 switch (BOND_MODE(bond)) {
1658 case BOND_MODE_ACTIVEBACKUP:
1659 bond_set_slave_inactive_flags(new_slave,
1660 BOND_SLAVE_NOTIFY_NOW);
1661 break;
1662 case BOND_MODE_8023AD:
1663 /* in 802.3ad mode, the internal mechanism
1664 * will activate the slaves in the selected
1665 * aggregator
1666 */
1667 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1668 /* if this is the first slave */
1669 if (!prev_slave) {
1670 SLAVE_AD_INFO(new_slave)->id = 1;
1671 /* Initialize AD with the number of times that the AD timer is called in 1 second
1672 * can be called only after the mac address of the bond is set
1673 */
1674 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1675 } else {
1676 SLAVE_AD_INFO(new_slave)->id =
1677 SLAVE_AD_INFO(prev_slave)->id + 1;
1678 }
1679
1680 bond_3ad_bind_slave(new_slave);
1681 break;
1682 case BOND_MODE_TLB:
1683 case BOND_MODE_ALB:
1684 bond_set_active_slave(new_slave);
1685 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1686 break;
1687 default:
1688 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1689
1690 /* always active in trunk mode */
1691 bond_set_active_slave(new_slave);
1692
1693 /* In trunking mode there is little meaning to curr_active_slave
1694 * anyway (it holds no special properties of the bond device),
1695 * so we can change it without calling change_active_interface()
1696 */
1697 if (!rcu_access_pointer(bond->curr_active_slave) &&
1698 new_slave->link == BOND_LINK_UP)
1699 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1700
1701 break;
1702 } /* switch(bond_mode) */
1703
1704#ifdef CONFIG_NET_POLL_CONTROLLER
1705 if (bond->dev->npinfo) {
1706 if (slave_enable_netpoll(new_slave)) {
1707 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1708 res = -EBUSY;
1709 goto err_detach;
1710 }
1711 }
1712#endif
1713
1714 if (!(bond_dev->features & NETIF_F_LRO))
1715 dev_disable_lro(slave_dev);
1716
1717 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1718 new_slave);
1719 if (res) {
1720 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1721 goto err_detach;
1722 }
1723
1724 res = bond_master_upper_dev_link(bond, new_slave, extack);
1725 if (res) {
1726 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1727 goto err_unregister;
1728 }
1729
1730 res = bond_sysfs_slave_add(new_slave);
1731 if (res) {
1732 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1733 goto err_upper_unlink;
1734 }
1735
1736 /* If the mode uses primary, then the following is handled by
1737 * bond_change_active_slave().
1738 */
1739 if (!bond_uses_primary(bond)) {
1740 /* set promiscuity level to new slave */
1741 if (bond_dev->flags & IFF_PROMISC) {
1742 res = dev_set_promiscuity(slave_dev, 1);
1743 if (res)
1744 goto err_sysfs_del;
1745 }
1746
1747 /* set allmulti level to new slave */
1748 if (bond_dev->flags & IFF_ALLMULTI) {
1749 res = dev_set_allmulti(slave_dev, 1);
1750 if (res) {
1751 if (bond_dev->flags & IFF_PROMISC)
1752 dev_set_promiscuity(slave_dev, -1);
1753 goto err_sysfs_del;
1754 }
1755 }
1756
1757 netif_addr_lock_bh(bond_dev);
1758 dev_mc_sync_multiple(slave_dev, bond_dev);
1759 dev_uc_sync_multiple(slave_dev, bond_dev);
1760 netif_addr_unlock_bh(bond_dev);
1761
1762 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1763 /* add lacpdu mc addr to mc list */
1764 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1765
1766 dev_mc_add(slave_dev, lacpdu_multicast);
1767 }
1768 }
1769
1770 bond->slave_cnt++;
1771 bond_compute_features(bond);
1772 bond_set_carrier(bond);
1773
1774 if (bond_uses_primary(bond)) {
1775 block_netpoll_tx();
1776 bond_select_active_slave(bond);
1777 unblock_netpoll_tx();
1778 }
1779
1780 if (bond_mode_can_use_xmit_hash(bond))
1781 bond_update_slave_arr(bond, NULL);
1782
1783
1784 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1785 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1786 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1787
1788 /* enslave is successful */
1789 bond_queue_slave_event(new_slave);
1790 return 0;
1791
1792/* Undo stages on error */
1793err_sysfs_del:
1794 bond_sysfs_slave_del(new_slave);
1795
1796err_upper_unlink:
1797 bond_upper_dev_unlink(bond, new_slave);
1798
1799err_unregister:
1800 netdev_rx_handler_unregister(slave_dev);
1801
1802err_detach:
1803 vlan_vids_del_by_dev(slave_dev, bond_dev);
1804 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1805 RCU_INIT_POINTER(bond->primary_slave, NULL);
1806 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1807 block_netpoll_tx();
1808 bond_change_active_slave(bond, NULL);
1809 bond_select_active_slave(bond);
1810 unblock_netpoll_tx();
1811 }
1812 /* either primary_slave or curr_active_slave might've changed */
1813 synchronize_rcu();
1814 slave_disable_netpoll(new_slave);
1815
1816err_close:
1817 if (!netif_is_bond_master(slave_dev))
1818 slave_dev->priv_flags &= ~IFF_BONDING;
1819 dev_close(slave_dev);
1820
1821err_restore_mac:
1822 slave_dev->flags &= ~IFF_SLAVE;
1823 if (!bond->params.fail_over_mac ||
1824 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1825 /* XXX TODO - fom follow mode needs to change master's
1826 * MAC if this slave's MAC is in use by the bond, or at
1827 * least print a warning.
1828 */
1829 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1830 new_slave->dev->addr_len);
1831 ss.ss_family = slave_dev->type;
1832 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
1833 }
1834
1835err_restore_mtu:
1836 dev_set_mtu(slave_dev, new_slave->original_mtu);
1837
1838err_free:
1839 bond_free_slave(new_slave);
1840
1841err_undo_flags:
1842 /* Enslave of first slave has failed and we need to fix master's mac */
1843 if (!bond_has_slaves(bond)) {
1844 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1845 slave_dev->dev_addr))
1846 eth_hw_addr_random(bond_dev);
1847 if (bond_dev->type != ARPHRD_ETHER) {
1848 dev_close(bond_dev);
1849 ether_setup(bond_dev);
1850 bond_dev->flags |= IFF_MASTER;
1851 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1852 }
1853 }
1854
1855 return res;
1856}
1857
1858/* Try to release the slave device <slave> from the bond device <master>
1859 * It is legal to access curr_active_slave without a lock because all the function
1860 * is RTNL-locked. If "all" is true it means that the function is being called
1861 * while destroying a bond interface and all slaves are being released.
1862 *
1863 * The rules for slave state should be:
1864 * for Active/Backup:
1865 * Active stays on all backups go down
1866 * for Bonded connections:
1867 * The first up interface should be left on and all others downed.
1868 */
1869static int __bond_release_one(struct net_device *bond_dev,
1870 struct net_device *slave_dev,
1871 bool all, bool unregister)
1872{
1873 struct bonding *bond = netdev_priv(bond_dev);
1874 struct slave *slave, *oldcurrent;
1875 struct sockaddr_storage ss;
1876 int old_flags = bond_dev->flags;
1877 netdev_features_t old_features = bond_dev->features;
1878
1879 /* slave is not a slave or master is not master of this slave */
1880 if (!(slave_dev->flags & IFF_SLAVE) ||
1881 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1882 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
1883 return -EINVAL;
1884 }
1885
1886 block_netpoll_tx();
1887
1888 slave = bond_get_slave_by_dev(bond, slave_dev);
1889 if (!slave) {
1890 /* not a slave of this bond */
1891 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
1892 unblock_netpoll_tx();
1893 return -EINVAL;
1894 }
1895
1896 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1897
1898 bond_sysfs_slave_del(slave);
1899
1900 /* recompute stats just before removing the slave */
1901 bond_get_stats(bond->dev, &bond->bond_stats);
1902
1903 bond_upper_dev_unlink(bond, slave);
1904 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1905 * for this slave anymore.
1906 */
1907 netdev_rx_handler_unregister(slave_dev);
1908
1909 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1910 bond_3ad_unbind_slave(slave);
1911
1912 if (bond_mode_can_use_xmit_hash(bond))
1913 bond_update_slave_arr(bond, slave);
1914
1915 slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
1916 bond_is_active_slave(slave) ? "active" : "backup");
1917
1918 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1919
1920 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1921
1922 if (!all && (!bond->params.fail_over_mac ||
1923 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1924 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1925 bond_has_slaves(bond))
1926 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",
1927 slave->perm_hwaddr);
1928 }
1929
1930 if (rtnl_dereference(bond->primary_slave) == slave)
1931 RCU_INIT_POINTER(bond->primary_slave, NULL);
1932
1933 if (oldcurrent == slave)
1934 bond_change_active_slave(bond, NULL);
1935
1936 if (bond_is_lb(bond)) {
1937 /* Must be called only after the slave has been
1938 * detached from the list and the curr_active_slave
1939 * has been cleared (if our_slave == old_current),
1940 * but before a new active slave is selected.
1941 */
1942 bond_alb_deinit_slave(bond, slave);
1943 }
1944
1945 if (all) {
1946 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1947 } else if (oldcurrent == slave) {
1948 /* Note that we hold RTNL over this sequence, so there
1949 * is no concern that another slave add/remove event
1950 * will interfere.
1951 */
1952 bond_select_active_slave(bond);
1953 }
1954
1955 if (!bond_has_slaves(bond)) {
1956 bond_set_carrier(bond);
1957 eth_hw_addr_random(bond_dev);
1958 }
1959
1960 unblock_netpoll_tx();
1961 synchronize_rcu();
1962 bond->slave_cnt--;
1963
1964 if (!bond_has_slaves(bond)) {
1965 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1966 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1967 }
1968
1969 bond_compute_features(bond);
1970 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1971 (old_features & NETIF_F_VLAN_CHALLENGED))
1972 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
1973
1974 vlan_vids_del_by_dev(slave_dev, bond_dev);
1975
1976 /* If the mode uses primary, then this case was handled above by
1977 * bond_change_active_slave(..., NULL)
1978 */
1979 if (!bond_uses_primary(bond)) {
1980 /* unset promiscuity level from slave
1981 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1982 * of the IFF_PROMISC flag in the bond_dev, but we need the
1983 * value of that flag before that change, as that was the value
1984 * when this slave was attached, so we cache at the start of the
1985 * function and use it here. Same goes for ALLMULTI below
1986 */
1987 if (old_flags & IFF_PROMISC)
1988 dev_set_promiscuity(slave_dev, -1);
1989
1990 /* unset allmulti level from slave */
1991 if (old_flags & IFF_ALLMULTI)
1992 dev_set_allmulti(slave_dev, -1);
1993
1994 bond_hw_addr_flush(bond_dev, slave_dev);
1995 }
1996
1997 slave_disable_netpoll(slave);
1998
1999 /* close slave before restoring its mac address */
2000 dev_close(slave_dev);
2001
2002 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2003 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2004 /* restore original ("permanent") mac address */
2005 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2006 slave->dev->addr_len);
2007 ss.ss_family = slave_dev->type;
2008 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2009 }
2010
2011 if (unregister)
2012 __dev_set_mtu(slave_dev, slave->original_mtu);
2013 else
2014 dev_set_mtu(slave_dev, slave->original_mtu);
2015
2016 if (!netif_is_bond_master(slave_dev))
2017 slave_dev->priv_flags &= ~IFF_BONDING;
2018
2019 bond_free_slave(slave);
2020
2021 return 0;
2022}
2023
2024/* A wrapper used because of ndo_del_link */
2025int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2026{
2027 return __bond_release_one(bond_dev, slave_dev, false, false);
2028}
2029
2030/* First release a slave and then destroy the bond if no more slaves are left.
2031 * Must be under rtnl_lock when this function is called.
2032 */
2033static int bond_release_and_destroy(struct net_device *bond_dev,
2034 struct net_device *slave_dev)
2035{
2036 struct bonding *bond = netdev_priv(bond_dev);
2037 int ret;
2038
2039 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2040 if (ret == 0 && !bond_has_slaves(bond)) {
2041 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2042 netdev_info(bond_dev, "Destroying bond\n");
2043 bond_remove_proc_entry(bond);
2044 unregister_netdevice(bond_dev);
2045 }
2046 return ret;
2047}
2048
2049static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2050{
2051 struct bonding *bond = netdev_priv(bond_dev);
2052 bond_fill_ifbond(bond, info);
2053}
2054
2055static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2056{
2057 struct bonding *bond = netdev_priv(bond_dev);
2058 struct list_head *iter;
2059 int i = 0, res = -ENODEV;
2060 struct slave *slave;
2061
2062 bond_for_each_slave(bond, slave, iter) {
2063 if (i++ == (int)info->slave_id) {
2064 res = 0;
2065 bond_fill_ifslave(slave, info);
2066 break;
2067 }
2068 }
2069
2070 return res;
2071}
2072
2073/*-------------------------------- Monitoring -------------------------------*/
2074
2075/* called with rcu_read_lock() */
2076static int bond_miimon_inspect(struct bonding *bond)
2077{
2078 int link_state, commit = 0;
2079 struct list_head *iter;
2080 struct slave *slave;
2081 bool ignore_updelay;
2082
2083 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2084
2085 bond_for_each_slave_rcu(bond, slave, iter) {
2086 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2087
2088 link_state = bond_check_dev_link(bond, slave->dev, 0);
2089
2090 switch (slave->link) {
2091 case BOND_LINK_UP:
2092 if (link_state)
2093 continue;
2094
2095 bond_propose_link_state(slave, BOND_LINK_FAIL);
2096 commit++;
2097 slave->delay = bond->params.downdelay;
2098 if (slave->delay) {
2099 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2100 (BOND_MODE(bond) ==
2101 BOND_MODE_ACTIVEBACKUP) ?
2102 (bond_is_active_slave(slave) ?
2103 "active " : "backup ") : "",
2104 bond->params.downdelay * bond->params.miimon);
2105 }
2106 /*FALLTHRU*/
2107 case BOND_LINK_FAIL:
2108 if (link_state) {
2109 /* recovered before downdelay expired */
2110 bond_propose_link_state(slave, BOND_LINK_UP);
2111 slave->last_link_up = jiffies;
2112 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2113 (bond->params.downdelay - slave->delay) *
2114 bond->params.miimon);
2115 commit++;
2116 continue;
2117 }
2118
2119 if (slave->delay <= 0) {
2120 bond_propose_link_state(slave, BOND_LINK_DOWN);
2121 commit++;
2122 continue;
2123 }
2124
2125 slave->delay--;
2126 break;
2127
2128 case BOND_LINK_DOWN:
2129 if (!link_state)
2130 continue;
2131
2132 bond_propose_link_state(slave, BOND_LINK_BACK);
2133 commit++;
2134 slave->delay = bond->params.updelay;
2135
2136 if (slave->delay) {
2137 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2138 ignore_updelay ? 0 :
2139 bond->params.updelay *
2140 bond->params.miimon);
2141 }
2142 /*FALLTHRU*/
2143 case BOND_LINK_BACK:
2144 if (!link_state) {
2145 bond_propose_link_state(slave, BOND_LINK_DOWN);
2146 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2147 (bond->params.updelay - slave->delay) *
2148 bond->params.miimon);
2149 commit++;
2150 continue;
2151 }
2152
2153 if (ignore_updelay)
2154 slave->delay = 0;
2155
2156 if (slave->delay <= 0) {
2157 bond_propose_link_state(slave, BOND_LINK_UP);
2158 commit++;
2159 ignore_updelay = false;
2160 continue;
2161 }
2162
2163 slave->delay--;
2164 break;
2165 }
2166 }
2167
2168 return commit;
2169}
2170
2171static void bond_miimon_link_change(struct bonding *bond,
2172 struct slave *slave,
2173 char link)
2174{
2175 switch (BOND_MODE(bond)) {
2176 case BOND_MODE_8023AD:
2177 bond_3ad_handle_link_change(slave, link);
2178 break;
2179 case BOND_MODE_TLB:
2180 case BOND_MODE_ALB:
2181 bond_alb_handle_link_change(bond, slave, link);
2182 break;
2183 case BOND_MODE_XOR:
2184 bond_update_slave_arr(bond, NULL);
2185 break;
2186 }
2187}
2188
2189static void bond_miimon_commit(struct bonding *bond)
2190{
2191 struct list_head *iter;
2192 struct slave *slave, *primary;
2193
2194 bond_for_each_slave(bond, slave, iter) {
2195 switch (slave->link_new_state) {
2196 case BOND_LINK_NOCHANGE:
2197 /* For 802.3ad mode, check current slave speed and
2198 * duplex again in case its port was disabled after
2199 * invalid speed/duplex reporting but recovered before
2200 * link monitoring could make a decision on the actual
2201 * link status
2202 */
2203 if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2204 slave->link == BOND_LINK_UP)
2205 bond_3ad_adapter_speed_duplex_changed(slave);
2206 continue;
2207
2208 case BOND_LINK_UP:
2209 if (bond_update_speed_duplex(slave) &&
2210 bond_needs_speed_duplex(bond)) {
2211 slave->link = BOND_LINK_DOWN;
2212 if (net_ratelimit())
2213 slave_warn(bond->dev, slave->dev,
2214 "failed to get link speed/duplex\n");
2215 continue;
2216 }
2217 bond_set_slave_link_state(slave, BOND_LINK_UP,
2218 BOND_SLAVE_NOTIFY_NOW);
2219 slave->last_link_up = jiffies;
2220
2221 primary = rtnl_dereference(bond->primary_slave);
2222 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2223 /* prevent it from being the active one */
2224 bond_set_backup_slave(slave);
2225 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2226 /* make it immediately active */
2227 bond_set_active_slave(slave);
2228 } else if (slave != primary) {
2229 /* prevent it from being the active one */
2230 bond_set_backup_slave(slave);
2231 }
2232
2233 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2234 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2235 slave->duplex ? "full" : "half");
2236
2237 bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2238
2239 if (!bond->curr_active_slave || slave == primary)
2240 goto do_failover;
2241
2242 continue;
2243
2244 case BOND_LINK_DOWN:
2245 if (slave->link_failure_count < UINT_MAX)
2246 slave->link_failure_count++;
2247
2248 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2249 BOND_SLAVE_NOTIFY_NOW);
2250
2251 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2252 BOND_MODE(bond) == BOND_MODE_8023AD)
2253 bond_set_slave_inactive_flags(slave,
2254 BOND_SLAVE_NOTIFY_NOW);
2255
2256 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2257
2258 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2259
2260 if (slave == rcu_access_pointer(bond->curr_active_slave))
2261 goto do_failover;
2262
2263 continue;
2264
2265 default:
2266 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2267 slave->link_new_state);
2268 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2269
2270 continue;
2271 }
2272
2273do_failover:
2274 block_netpoll_tx();
2275 bond_select_active_slave(bond);
2276 unblock_netpoll_tx();
2277 }
2278
2279 bond_set_carrier(bond);
2280}
2281
2282/* bond_mii_monitor
2283 *
2284 * Really a wrapper that splits the mii monitor into two phases: an
2285 * inspection, then (if inspection indicates something needs to be done)
2286 * an acquisition of appropriate locks followed by a commit phase to
2287 * implement whatever link state changes are indicated.
2288 */
2289static void bond_mii_monitor(struct work_struct *work)
2290{
2291 struct bonding *bond = container_of(work, struct bonding,
2292 mii_work.work);
2293 bool should_notify_peers = false;
2294 bool commit;
2295 unsigned long delay;
2296 struct slave *slave;
2297 struct list_head *iter;
2298
2299 delay = msecs_to_jiffies(bond->params.miimon);
2300
2301 if (!bond_has_slaves(bond))
2302 goto re_arm;
2303
2304 rcu_read_lock();
2305 should_notify_peers = bond_should_notify_peers(bond);
2306 commit = !!bond_miimon_inspect(bond);
2307 if (bond->send_peer_notif) {
2308 rcu_read_unlock();
2309 if (rtnl_trylock()) {
2310 bond->send_peer_notif--;
2311 rtnl_unlock();
2312 }
2313 } else {
2314 rcu_read_unlock();
2315 }
2316
2317 if (commit) {
2318 /* Race avoidance with bond_close cancel of workqueue */
2319 if (!rtnl_trylock()) {
2320 delay = 1;
2321 should_notify_peers = false;
2322 goto re_arm;
2323 }
2324
2325 bond_for_each_slave(bond, slave, iter) {
2326 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2327 }
2328 bond_miimon_commit(bond);
2329
2330 rtnl_unlock(); /* might sleep, hold no other locks */
2331 }
2332
2333re_arm:
2334 if (bond->params.miimon)
2335 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2336
2337 if (should_notify_peers) {
2338 if (!rtnl_trylock())
2339 return;
2340 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2341 rtnl_unlock();
2342 }
2343}
2344
2345static int bond_upper_dev_walk(struct net_device *upper, void *data)
2346{
2347 __be32 ip = *((__be32 *)data);
2348
2349 return ip == bond_confirm_addr(upper, 0, ip);
2350}
2351
2352static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2353{
2354 bool ret = false;
2355
2356 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2357 return true;
2358
2359 rcu_read_lock();
2360 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2361 ret = true;
2362 rcu_read_unlock();
2363
2364 return ret;
2365}
2366
2367/* We go to the (large) trouble of VLAN tagging ARP frames because
2368 * switches in VLAN mode (especially if ports are configured as
2369 * "native" to a VLAN) might not pass non-tagged frames.
2370 */
2371static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2372 __be32 src_ip, struct bond_vlan_tag *tags)
2373{
2374 struct sk_buff *skb;
2375 struct bond_vlan_tag *outer_tag = tags;
2376 struct net_device *slave_dev = slave->dev;
2377 struct net_device *bond_dev = slave->bond->dev;
2378
2379 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2380 arp_op, &dest_ip, &src_ip);
2381
2382 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2383 NULL, slave_dev->dev_addr, NULL);
2384
2385 if (!skb) {
2386 net_err_ratelimited("ARP packet allocation failed\n");
2387 return;
2388 }
2389
2390 if (!tags || tags->vlan_proto == VLAN_N_VID)
2391 goto xmit;
2392
2393 tags++;
2394
2395 /* Go through all the tags backwards and add them to the packet */
2396 while (tags->vlan_proto != VLAN_N_VID) {
2397 if (!tags->vlan_id) {
2398 tags++;
2399 continue;
2400 }
2401
2402 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2403 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2404 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2405 tags->vlan_id);
2406 if (!skb) {
2407 net_err_ratelimited("failed to insert inner VLAN tag\n");
2408 return;
2409 }
2410
2411 tags++;
2412 }
2413 /* Set the outer tag */
2414 if (outer_tag->vlan_id) {
2415 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2416 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2417 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2418 outer_tag->vlan_id);
2419 }
2420
2421xmit:
2422 arp_xmit(skb);
2423}
2424
2425/* Validate the device path between the @start_dev and the @end_dev.
2426 * The path is valid if the @end_dev is reachable through device
2427 * stacking.
2428 * When the path is validated, collect any vlan information in the
2429 * path.
2430 */
2431struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2432 struct net_device *end_dev,
2433 int level)
2434{
2435 struct bond_vlan_tag *tags;
2436 struct net_device *upper;
2437 struct list_head *iter;
2438
2439 if (start_dev == end_dev) {
2440 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2441 if (!tags)
2442 return ERR_PTR(-ENOMEM);
2443 tags[level].vlan_proto = VLAN_N_VID;
2444 return tags;
2445 }
2446
2447 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2448 tags = bond_verify_device_path(upper, end_dev, level + 1);
2449 if (IS_ERR_OR_NULL(tags)) {
2450 if (IS_ERR(tags))
2451 return tags;
2452 continue;
2453 }
2454 if (is_vlan_dev(upper)) {
2455 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2456 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2457 }
2458
2459 return tags;
2460 }
2461
2462 return NULL;
2463}
2464
2465static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2466{
2467 struct rtable *rt;
2468 struct bond_vlan_tag *tags;
2469 __be32 *targets = bond->params.arp_targets, addr;
2470 int i;
2471
2472 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2473 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2474 __func__, &targets[i]);
2475 tags = NULL;
2476
2477 /* Find out through which dev should the packet go */
2478 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2479 RTO_ONLINK, 0);
2480 if (IS_ERR(rt)) {
2481 /* there's no route to target - try to send arp
2482 * probe to generate any traffic (arp_validate=0)
2483 */
2484 if (bond->params.arp_validate)
2485 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2486 bond->dev->name,
2487 &targets[i]);
2488 bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2489 0, tags);
2490 continue;
2491 }
2492
2493 /* bond device itself */
2494 if (rt->dst.dev == bond->dev)
2495 goto found;
2496
2497 rcu_read_lock();
2498 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2499 rcu_read_unlock();
2500
2501 if (!IS_ERR_OR_NULL(tags))
2502 goto found;
2503
2504 /* Not our device - skip */
2505 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2506 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2507
2508 ip_rt_put(rt);
2509 continue;
2510
2511found:
2512 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2513 ip_rt_put(rt);
2514 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2515 kfree(tags);
2516 }
2517}
2518
2519static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2520{
2521 int i;
2522
2523 if (!sip || !bond_has_this_ip(bond, tip)) {
2524 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2525 __func__, &sip, &tip);
2526 return;
2527 }
2528
2529 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2530 if (i == -1) {
2531 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2532 __func__, &sip);
2533 return;
2534 }
2535 slave->last_rx = jiffies;
2536 slave->target_last_arp_rx[i] = jiffies;
2537}
2538
2539int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2540 struct slave *slave)
2541{
2542 struct arphdr *arp = (struct arphdr *)skb->data;
2543 struct slave *curr_active_slave, *curr_arp_slave;
2544 unsigned char *arp_ptr;
2545 __be32 sip, tip;
2546 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2547 unsigned int alen;
2548
2549 if (!slave_do_arp_validate(bond, slave)) {
2550 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2551 !slave_do_arp_validate_only(bond))
2552 slave->last_rx = jiffies;
2553 return RX_HANDLER_ANOTHER;
2554 } else if (!is_arp) {
2555 return RX_HANDLER_ANOTHER;
2556 }
2557
2558 alen = arp_hdr_len(bond->dev);
2559
2560 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2561 __func__, skb->dev->name);
2562
2563 if (alen > skb_headlen(skb)) {
2564 arp = kmalloc(alen, GFP_ATOMIC);
2565 if (!arp)
2566 goto out_unlock;
2567 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2568 goto out_unlock;
2569 }
2570
2571 if (arp->ar_hln != bond->dev->addr_len ||
2572 skb->pkt_type == PACKET_OTHERHOST ||
2573 skb->pkt_type == PACKET_LOOPBACK ||
2574 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2575 arp->ar_pro != htons(ETH_P_IP) ||
2576 arp->ar_pln != 4)
2577 goto out_unlock;
2578
2579 arp_ptr = (unsigned char *)(arp + 1);
2580 arp_ptr += bond->dev->addr_len;
2581 memcpy(&sip, arp_ptr, 4);
2582 arp_ptr += 4 + bond->dev->addr_len;
2583 memcpy(&tip, arp_ptr, 4);
2584
2585 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2586 __func__, slave->dev->name, bond_slave_state(slave),
2587 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2588 &sip, &tip);
2589
2590 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2591 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2592
2593 /* We 'trust' the received ARP enough to validate it if:
2594 *
2595 * (a) the slave receiving the ARP is active (which includes the
2596 * current ARP slave, if any), or
2597 *
2598 * (b) the receiving slave isn't active, but there is a currently
2599 * active slave and it received valid arp reply(s) after it became
2600 * the currently active slave, or
2601 *
2602 * (c) there is an ARP slave that sent an ARP during the prior ARP
2603 * interval, and we receive an ARP reply on any slave. We accept
2604 * these because switch FDB update delays may deliver the ARP
2605 * reply to a slave other than the sender of the ARP request.
2606 *
2607 * Note: for (b), backup slaves are receiving the broadcast ARP
2608 * request, not a reply. This request passes from the sending
2609 * slave through the L2 switch(es) to the receiving slave. Since
2610 * this is checking the request, sip/tip are swapped for
2611 * validation.
2612 *
2613 * This is done to avoid endless looping when we can't reach the
2614 * arp_ip_target and fool ourselves with our own arp requests.
2615 */
2616 if (bond_is_active_slave(slave))
2617 bond_validate_arp(bond, slave, sip, tip);
2618 else if (curr_active_slave &&
2619 time_after(slave_last_rx(bond, curr_active_slave),
2620 curr_active_slave->last_link_up))
2621 bond_validate_arp(bond, slave, tip, sip);
2622 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2623 bond_time_in_interval(bond,
2624 dev_trans_start(curr_arp_slave->dev), 1))
2625 bond_validate_arp(bond, slave, sip, tip);
2626
2627out_unlock:
2628 if (arp != (struct arphdr *)skb->data)
2629 kfree(arp);
2630 return RX_HANDLER_ANOTHER;
2631}
2632
2633/* function to verify if we're in the arp_interval timeslice, returns true if
2634 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2635 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2636 */
2637static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2638 int mod)
2639{
2640 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2641
2642 return time_in_range(jiffies,
2643 last_act - delta_in_ticks,
2644 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2645}
2646
2647/* This function is called regularly to monitor each slave's link
2648 * ensuring that traffic is being sent and received when arp monitoring
2649 * is used in load-balancing mode. if the adapter has been dormant, then an
2650 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2651 * arp monitoring in active backup mode.
2652 */
2653static void bond_loadbalance_arp_mon(struct bonding *bond)
2654{
2655 struct slave *slave, *oldcurrent;
2656 struct list_head *iter;
2657 int do_failover = 0, slave_state_changed = 0;
2658
2659 if (!bond_has_slaves(bond))
2660 goto re_arm;
2661
2662 rcu_read_lock();
2663
2664 oldcurrent = rcu_dereference(bond->curr_active_slave);
2665 /* see if any of the previous devices are up now (i.e. they have
2666 * xmt and rcv traffic). the curr_active_slave does not come into
2667 * the picture unless it is null. also, slave->last_link_up is not
2668 * needed here because we send an arp on each slave and give a slave
2669 * as long as it needs to get the tx/rx within the delta.
2670 * TODO: what about up/down delay in arp mode? it wasn't here before
2671 * so it can wait
2672 */
2673 bond_for_each_slave_rcu(bond, slave, iter) {
2674 unsigned long trans_start = dev_trans_start(slave->dev);
2675
2676 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2677
2678 if (slave->link != BOND_LINK_UP) {
2679 if (bond_time_in_interval(bond, trans_start, 1) &&
2680 bond_time_in_interval(bond, slave->last_rx, 1)) {
2681
2682 bond_propose_link_state(slave, BOND_LINK_UP);
2683 slave_state_changed = 1;
2684
2685 /* primary_slave has no meaning in round-robin
2686 * mode. the window of a slave being up and
2687 * curr_active_slave being null after enslaving
2688 * is closed.
2689 */
2690 if (!oldcurrent) {
2691 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2692 do_failover = 1;
2693 } else {
2694 slave_info(bond->dev, slave->dev, "interface is now up\n");
2695 }
2696 }
2697 } else {
2698 /* slave->link == BOND_LINK_UP */
2699
2700 /* not all switches will respond to an arp request
2701 * when the source ip is 0, so don't take the link down
2702 * if we don't know our ip yet
2703 */
2704 if (!bond_time_in_interval(bond, trans_start, 2) ||
2705 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2706
2707 bond_propose_link_state(slave, BOND_LINK_DOWN);
2708 slave_state_changed = 1;
2709
2710 if (slave->link_failure_count < UINT_MAX)
2711 slave->link_failure_count++;
2712
2713 slave_info(bond->dev, slave->dev, "interface is now down\n");
2714
2715 if (slave == oldcurrent)
2716 do_failover = 1;
2717 }
2718 }
2719
2720 /* note: if switch is in round-robin mode, all links
2721 * must tx arp to ensure all links rx an arp - otherwise
2722 * links may oscillate or not come up at all; if switch is
2723 * in something like xor mode, there is nothing we can
2724 * do - all replies will be rx'ed on same link causing slaves
2725 * to be unstable during low/no traffic periods
2726 */
2727 if (bond_slave_is_up(slave))
2728 bond_arp_send_all(bond, slave);
2729 }
2730
2731 rcu_read_unlock();
2732
2733 if (do_failover || slave_state_changed) {
2734 if (!rtnl_trylock())
2735 goto re_arm;
2736
2737 bond_for_each_slave(bond, slave, iter) {
2738 if (slave->link_new_state != BOND_LINK_NOCHANGE)
2739 slave->link = slave->link_new_state;
2740 }
2741
2742 if (slave_state_changed) {
2743 bond_slave_state_change(bond);
2744 if (BOND_MODE(bond) == BOND_MODE_XOR)
2745 bond_update_slave_arr(bond, NULL);
2746 }
2747 if (do_failover) {
2748 block_netpoll_tx();
2749 bond_select_active_slave(bond);
2750 unblock_netpoll_tx();
2751 }
2752 rtnl_unlock();
2753 }
2754
2755re_arm:
2756 if (bond->params.arp_interval)
2757 queue_delayed_work(bond->wq, &bond->arp_work,
2758 msecs_to_jiffies(bond->params.arp_interval));
2759}
2760
2761/* Called to inspect slaves for active-backup mode ARP monitor link state
2762 * changes. Sets proposed link state in slaves to specify what action
2763 * should take place for the slave. Returns 0 if no changes are found, >0
2764 * if changes to link states must be committed.
2765 *
2766 * Called with rcu_read_lock held.
2767 */
2768static int bond_ab_arp_inspect(struct bonding *bond)
2769{
2770 unsigned long trans_start, last_rx;
2771 struct list_head *iter;
2772 struct slave *slave;
2773 int commit = 0;
2774
2775 bond_for_each_slave_rcu(bond, slave, iter) {
2776 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2777 last_rx = slave_last_rx(bond, slave);
2778
2779 if (slave->link != BOND_LINK_UP) {
2780 if (bond_time_in_interval(bond, last_rx, 1)) {
2781 bond_propose_link_state(slave, BOND_LINK_UP);
2782 commit++;
2783 }
2784 continue;
2785 }
2786
2787 /* Give slaves 2*delta after being enslaved or made
2788 * active. This avoids bouncing, as the last receive
2789 * times need a full ARP monitor cycle to be updated.
2790 */
2791 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2792 continue;
2793
2794 /* Backup slave is down if:
2795 * - No current_arp_slave AND
2796 * - more than 3*delta since last receive AND
2797 * - the bond has an IP address
2798 *
2799 * Note: a non-null current_arp_slave indicates
2800 * the curr_active_slave went down and we are
2801 * searching for a new one; under this condition
2802 * we only take the curr_active_slave down - this
2803 * gives each slave a chance to tx/rx traffic
2804 * before being taken out
2805 */
2806 if (!bond_is_active_slave(slave) &&
2807 !rcu_access_pointer(bond->current_arp_slave) &&
2808 !bond_time_in_interval(bond, last_rx, 3)) {
2809 bond_propose_link_state(slave, BOND_LINK_DOWN);
2810 commit++;
2811 }
2812
2813 /* Active slave is down if:
2814 * - more than 2*delta since transmitting OR
2815 * - (more than 2*delta since receive AND
2816 * the bond has an IP address)
2817 */
2818 trans_start = dev_trans_start(slave->dev);
2819 if (bond_is_active_slave(slave) &&
2820 (!bond_time_in_interval(bond, trans_start, 2) ||
2821 !bond_time_in_interval(bond, last_rx, 2))) {
2822 bond_propose_link_state(slave, BOND_LINK_DOWN);
2823 commit++;
2824 }
2825 }
2826
2827 return commit;
2828}
2829
2830/* Called to commit link state changes noted by inspection step of
2831 * active-backup mode ARP monitor.
2832 *
2833 * Called with RTNL hold.
2834 */
2835static void bond_ab_arp_commit(struct bonding *bond)
2836{
2837 unsigned long trans_start;
2838 struct list_head *iter;
2839 struct slave *slave;
2840
2841 bond_for_each_slave(bond, slave, iter) {
2842 switch (slave->link_new_state) {
2843 case BOND_LINK_NOCHANGE:
2844 continue;
2845
2846 case BOND_LINK_UP:
2847 trans_start = dev_trans_start(slave->dev);
2848 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2849 (!rtnl_dereference(bond->curr_active_slave) &&
2850 bond_time_in_interval(bond, trans_start, 1))) {
2851 struct slave *current_arp_slave;
2852
2853 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2854 bond_set_slave_link_state(slave, BOND_LINK_UP,
2855 BOND_SLAVE_NOTIFY_NOW);
2856 if (current_arp_slave) {
2857 bond_set_slave_inactive_flags(
2858 current_arp_slave,
2859 BOND_SLAVE_NOTIFY_NOW);
2860 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2861 }
2862
2863 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2864
2865 if (!rtnl_dereference(bond->curr_active_slave) ||
2866 slave == rtnl_dereference(bond->primary_slave))
2867 goto do_failover;
2868
2869 }
2870
2871 continue;
2872
2873 case BOND_LINK_DOWN:
2874 if (slave->link_failure_count < UINT_MAX)
2875 slave->link_failure_count++;
2876
2877 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2878 BOND_SLAVE_NOTIFY_NOW);
2879 bond_set_slave_inactive_flags(slave,
2880 BOND_SLAVE_NOTIFY_NOW);
2881
2882 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2883
2884 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2885 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2886 goto do_failover;
2887 }
2888
2889 continue;
2890
2891 default:
2892 slave_err(bond->dev, slave->dev,
2893 "impossible: link_new_state %d on slave\n",
2894 slave->link_new_state);
2895 continue;
2896 }
2897
2898do_failover:
2899 block_netpoll_tx();
2900 bond_select_active_slave(bond);
2901 unblock_netpoll_tx();
2902 }
2903
2904 bond_set_carrier(bond);
2905}
2906
2907/* Send ARP probes for active-backup mode ARP monitor.
2908 *
2909 * Called with rcu_read_lock held.
2910 */
2911static bool bond_ab_arp_probe(struct bonding *bond)
2912{
2913 struct slave *slave, *before = NULL, *new_slave = NULL,
2914 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2915 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2916 struct list_head *iter;
2917 bool found = false;
2918 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2919
2920 if (curr_arp_slave && curr_active_slave)
2921 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2922 curr_arp_slave->dev->name,
2923 curr_active_slave->dev->name);
2924
2925 if (curr_active_slave) {
2926 bond_arp_send_all(bond, curr_active_slave);
2927 return should_notify_rtnl;
2928 }
2929
2930 /* if we don't have a curr_active_slave, search for the next available
2931 * backup slave from the current_arp_slave and make it the candidate
2932 * for becoming the curr_active_slave
2933 */
2934
2935 if (!curr_arp_slave) {
2936 curr_arp_slave = bond_first_slave_rcu(bond);
2937 if (!curr_arp_slave)
2938 return should_notify_rtnl;
2939 }
2940
2941 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2942
2943 bond_for_each_slave_rcu(bond, slave, iter) {
2944 if (!found && !before && bond_slave_is_up(slave))
2945 before = slave;
2946
2947 if (found && !new_slave && bond_slave_is_up(slave))
2948 new_slave = slave;
2949 /* if the link state is up at this point, we
2950 * mark it down - this can happen if we have
2951 * simultaneous link failures and
2952 * reselect_active_interface doesn't make this
2953 * one the current slave so it is still marked
2954 * up when it is actually down
2955 */
2956 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2957 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2958 BOND_SLAVE_NOTIFY_LATER);
2959 if (slave->link_failure_count < UINT_MAX)
2960 slave->link_failure_count++;
2961
2962 bond_set_slave_inactive_flags(slave,
2963 BOND_SLAVE_NOTIFY_LATER);
2964
2965 slave_info(bond->dev, slave->dev, "backup interface is now down\n");
2966 }
2967 if (slave == curr_arp_slave)
2968 found = true;
2969 }
2970
2971 if (!new_slave && before)
2972 new_slave = before;
2973
2974 if (!new_slave)
2975 goto check_state;
2976
2977 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
2978 BOND_SLAVE_NOTIFY_LATER);
2979 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2980 bond_arp_send_all(bond, new_slave);
2981 new_slave->last_link_up = jiffies;
2982 rcu_assign_pointer(bond->current_arp_slave, new_slave);
2983
2984check_state:
2985 bond_for_each_slave_rcu(bond, slave, iter) {
2986 if (slave->should_notify || slave->should_notify_link) {
2987 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2988 break;
2989 }
2990 }
2991 return should_notify_rtnl;
2992}
2993
2994static void bond_activebackup_arp_mon(struct bonding *bond)
2995{
2996 bool should_notify_peers = false;
2997 bool should_notify_rtnl = false;
2998 int delta_in_ticks;
2999
3000 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3001
3002 if (!bond_has_slaves(bond))
3003 goto re_arm;
3004
3005 rcu_read_lock();
3006
3007 should_notify_peers = bond_should_notify_peers(bond);
3008
3009 if (bond_ab_arp_inspect(bond)) {
3010 rcu_read_unlock();
3011
3012 /* Race avoidance with bond_close flush of workqueue */
3013 if (!rtnl_trylock()) {
3014 delta_in_ticks = 1;
3015 should_notify_peers = false;
3016 goto re_arm;
3017 }
3018
3019 bond_ab_arp_commit(bond);
3020
3021 rtnl_unlock();
3022 rcu_read_lock();
3023 }
3024
3025 should_notify_rtnl = bond_ab_arp_probe(bond);
3026 rcu_read_unlock();
3027
3028re_arm:
3029 if (bond->params.arp_interval)
3030 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3031
3032 if (should_notify_peers || should_notify_rtnl) {
3033 if (!rtnl_trylock())
3034 return;
3035
3036 if (should_notify_peers)
3037 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3038 bond->dev);
3039 if (should_notify_rtnl) {
3040 bond_slave_state_notify(bond);
3041 bond_slave_link_notify(bond);
3042 }
3043
3044 rtnl_unlock();
3045 }
3046}
3047
3048static void bond_arp_monitor(struct work_struct *work)
3049{
3050 struct bonding *bond = container_of(work, struct bonding,
3051 arp_work.work);
3052
3053 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3054 bond_activebackup_arp_mon(bond);
3055 else
3056 bond_loadbalance_arp_mon(bond);
3057}
3058
3059/*-------------------------- netdev event handling --------------------------*/
3060
3061/* Change device name */
3062static int bond_event_changename(struct bonding *bond)
3063{
3064 bond_remove_proc_entry(bond);
3065 bond_create_proc_entry(bond);
3066
3067 bond_debug_reregister(bond);
3068
3069 return NOTIFY_DONE;
3070}
3071
3072static int bond_master_netdev_event(unsigned long event,
3073 struct net_device *bond_dev)
3074{
3075 struct bonding *event_bond = netdev_priv(bond_dev);
3076
3077 netdev_dbg(bond_dev, "%s called\n", __func__);
3078
3079 switch (event) {
3080 case NETDEV_CHANGENAME:
3081 return bond_event_changename(event_bond);
3082 case NETDEV_UNREGISTER:
3083 bond_remove_proc_entry(event_bond);
3084 break;
3085 case NETDEV_REGISTER:
3086 bond_create_proc_entry(event_bond);
3087 break;
3088 default:
3089 break;
3090 }
3091
3092 return NOTIFY_DONE;
3093}
3094
3095static int bond_slave_netdev_event(unsigned long event,
3096 struct net_device *slave_dev)
3097{
3098 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3099 struct bonding *bond;
3100 struct net_device *bond_dev;
3101
3102 /* A netdev event can be generated while enslaving a device
3103 * before netdev_rx_handler_register is called in which case
3104 * slave will be NULL
3105 */
3106 if (!slave) {
3107 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3108 return NOTIFY_DONE;
3109 }
3110
3111 bond_dev = slave->bond->dev;
3112 bond = slave->bond;
3113 primary = rtnl_dereference(bond->primary_slave);
3114
3115 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3116
3117 switch (event) {
3118 case NETDEV_UNREGISTER:
3119 if (bond_dev->type != ARPHRD_ETHER)
3120 bond_release_and_destroy(bond_dev, slave_dev);
3121 else
3122 __bond_release_one(bond_dev, slave_dev, false, true);
3123 break;
3124 case NETDEV_UP:
3125 case NETDEV_CHANGE:
3126 /* For 802.3ad mode only:
3127 * Getting invalid Speed/Duplex values here will put slave
3128 * in weird state. Mark it as link-fail if the link was
3129 * previously up or link-down if it hasn't yet come up, and
3130 * let link-monitoring (miimon) set it right when correct
3131 * speeds/duplex are available.
3132 */
3133 if (bond_update_speed_duplex(slave) &&
3134 BOND_MODE(bond) == BOND_MODE_8023AD) {
3135 if (slave->last_link_up)
3136 slave->link = BOND_LINK_FAIL;
3137 else
3138 slave->link = BOND_LINK_DOWN;
3139 }
3140
3141 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3142 bond_3ad_adapter_speed_duplex_changed(slave);
3143 /* Fallthrough */
3144 case NETDEV_DOWN:
3145 /* Refresh slave-array if applicable!
3146 * If the setup does not use miimon or arpmon (mode-specific!),
3147 * then these events will not cause the slave-array to be
3148 * refreshed. This will cause xmit to use a slave that is not
3149 * usable. Avoid such situation by refeshing the array at these
3150 * events. If these (miimon/arpmon) parameters are configured
3151 * then array gets refreshed twice and that should be fine!
3152 */
3153 if (bond_mode_can_use_xmit_hash(bond))
3154 bond_update_slave_arr(bond, NULL);
3155 break;
3156 case NETDEV_CHANGEMTU:
3157 /* TODO: Should slaves be allowed to
3158 * independently alter their MTU? For
3159 * an active-backup bond, slaves need
3160 * not be the same type of device, so
3161 * MTUs may vary. For other modes,
3162 * slaves arguably should have the
3163 * same MTUs. To do this, we'd need to
3164 * take over the slave's change_mtu
3165 * function for the duration of their
3166 * servitude.
3167 */
3168 break;
3169 case NETDEV_CHANGENAME:
3170 /* we don't care if we don't have primary set */
3171 if (!bond_uses_primary(bond) ||
3172 !bond->params.primary[0])
3173 break;
3174
3175 if (slave == primary) {
3176 /* slave's name changed - he's no longer primary */
3177 RCU_INIT_POINTER(bond->primary_slave, NULL);
3178 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3179 /* we have a new primary slave */
3180 rcu_assign_pointer(bond->primary_slave, slave);
3181 } else { /* we didn't change primary - exit */
3182 break;
3183 }
3184
3185 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3186 primary ? slave_dev->name : "none");
3187
3188 block_netpoll_tx();
3189 bond_select_active_slave(bond);
3190 unblock_netpoll_tx();
3191 break;
3192 case NETDEV_FEAT_CHANGE:
3193 bond_compute_features(bond);
3194 break;
3195 case NETDEV_RESEND_IGMP:
3196 /* Propagate to master device */
3197 call_netdevice_notifiers(event, slave->bond->dev);
3198 break;
3199 default:
3200 break;
3201 }
3202
3203 return NOTIFY_DONE;
3204}
3205
3206/* bond_netdev_event: handle netdev notifier chain events.
3207 *
3208 * This function receives events for the netdev chain. The caller (an
3209 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3210 * locks for us to safely manipulate the slave devices (RTNL lock,
3211 * dev_probe_lock).
3212 */
3213static int bond_netdev_event(struct notifier_block *this,
3214 unsigned long event, void *ptr)
3215{
3216 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3217
3218 netdev_dbg(event_dev, "%s received %s\n",
3219 __func__, netdev_cmd_to_name(event));
3220
3221 if (!(event_dev->priv_flags & IFF_BONDING))
3222 return NOTIFY_DONE;
3223
3224 if (event_dev->flags & IFF_MASTER) {
3225 int ret;
3226
3227 ret = bond_master_netdev_event(event, event_dev);
3228 if (ret != NOTIFY_DONE)
3229 return ret;
3230 }
3231
3232 if (event_dev->flags & IFF_SLAVE)
3233 return bond_slave_netdev_event(event, event_dev);
3234
3235 return NOTIFY_DONE;
3236}
3237
3238static struct notifier_block bond_netdev_notifier = {
3239 .notifier_call = bond_netdev_event,
3240};
3241
3242/*---------------------------- Hashing Policies -----------------------------*/
3243
3244/* L2 hash helper */
3245static inline u32 bond_eth_hash(struct sk_buff *skb)
3246{
3247 struct ethhdr *ep, hdr_tmp;
3248
3249 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3250 if (ep)
3251 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3252 return 0;
3253}
3254
3255/* Extract the appropriate headers based on bond's xmit policy */
3256static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3257 struct flow_keys *fk)
3258{
3259 const struct ipv6hdr *iph6;
3260 const struct iphdr *iph;
3261 int noff, proto = -1;
3262
3263 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3264 return skb_flow_dissect_flow_keys(skb, fk, 0);
3265
3266 fk->ports.ports = 0;
3267 noff = skb_network_offset(skb);
3268 if (skb->protocol == htons(ETH_P_IP)) {
3269 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3270 return false;
3271 iph = ip_hdr(skb);
3272 iph_to_flow_copy_v4addrs(fk, iph);
3273 noff += iph->ihl << 2;
3274 if (!ip_is_fragment(iph))
3275 proto = iph->protocol;
3276 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3277 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3278 return false;
3279 iph6 = ipv6_hdr(skb);
3280 iph_to_flow_copy_v6addrs(fk, iph6);
3281 noff += sizeof(*iph6);
3282 proto = iph6->nexthdr;
3283 } else {
3284 return false;
3285 }
3286 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3287 fk->ports.ports = skb_flow_get_ports(skb, noff, proto);
3288
3289 return true;
3290}
3291
3292/**
3293 * bond_xmit_hash - generate a hash value based on the xmit policy
3294 * @bond: bonding device
3295 * @skb: buffer to use for headers
3296 *
3297 * This function will extract the necessary headers from the skb buffer and use
3298 * them to generate a hash based on the xmit_policy set in the bonding device
3299 */
3300u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3301{
3302 struct flow_keys flow;
3303 u32 hash;
3304
3305 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3306 skb->l4_hash)
3307 return skb->hash;
3308
3309 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3310 !bond_flow_dissect(bond, skb, &flow))
3311 return bond_eth_hash(skb);
3312
3313 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3314 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3315 hash = bond_eth_hash(skb);
3316 else
3317 hash = (__force u32)flow.ports.ports;
3318 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3319 (__force u32)flow_get_u32_src(&flow);
3320 hash ^= (hash >> 16);
3321 hash ^= (hash >> 8);
3322
3323 return hash >> 1;
3324}
3325
3326/*-------------------------- Device entry points ----------------------------*/
3327
3328void bond_work_init_all(struct bonding *bond)
3329{
3330 INIT_DELAYED_WORK(&bond->mcast_work,
3331 bond_resend_igmp_join_requests_delayed);
3332 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3333 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3334 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3335 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3336 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3337}
3338
3339static void bond_work_cancel_all(struct bonding *bond)
3340{
3341 cancel_delayed_work_sync(&bond->mii_work);
3342 cancel_delayed_work_sync(&bond->arp_work);
3343 cancel_delayed_work_sync(&bond->alb_work);
3344 cancel_delayed_work_sync(&bond->ad_work);
3345 cancel_delayed_work_sync(&bond->mcast_work);
3346 cancel_delayed_work_sync(&bond->slave_arr_work);
3347}
3348
3349static int bond_open(struct net_device *bond_dev)
3350{
3351 struct bonding *bond = netdev_priv(bond_dev);
3352 struct list_head *iter;
3353 struct slave *slave;
3354
3355 /* reset slave->backup and slave->inactive */
3356 if (bond_has_slaves(bond)) {
3357 bond_for_each_slave(bond, slave, iter) {
3358 if (bond_uses_primary(bond) &&
3359 slave != rcu_access_pointer(bond->curr_active_slave)) {
3360 bond_set_slave_inactive_flags(slave,
3361 BOND_SLAVE_NOTIFY_NOW);
3362 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3363 bond_set_slave_active_flags(slave,
3364 BOND_SLAVE_NOTIFY_NOW);
3365 }
3366 }
3367 }
3368
3369 if (bond_is_lb(bond)) {
3370 /* bond_alb_initialize must be called before the timer
3371 * is started.
3372 */
3373 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3374 return -ENOMEM;
3375 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3376 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3377 }
3378
3379 if (bond->params.miimon) /* link check interval, in milliseconds. */
3380 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3381
3382 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3383 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3384 bond->recv_probe = bond_arp_rcv;
3385 }
3386
3387 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3388 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3389 /* register to receive LACPDUs */
3390 bond->recv_probe = bond_3ad_lacpdu_recv;
3391 bond_3ad_initiate_agg_selection(bond, 1);
3392 }
3393
3394 if (bond_mode_can_use_xmit_hash(bond))
3395 bond_update_slave_arr(bond, NULL);
3396
3397 return 0;
3398}
3399
3400static int bond_close(struct net_device *bond_dev)
3401{
3402 struct bonding *bond = netdev_priv(bond_dev);
3403
3404 bond_work_cancel_all(bond);
3405 bond->send_peer_notif = 0;
3406 if (bond_is_lb(bond))
3407 bond_alb_deinitialize(bond);
3408 bond->recv_probe = NULL;
3409
3410 return 0;
3411}
3412
3413/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3414 * that some drivers can provide 32bit values only.
3415 */
3416static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3417 const struct rtnl_link_stats64 *_new,
3418 const struct rtnl_link_stats64 *_old)
3419{
3420 const u64 *new = (const u64 *)_new;
3421 const u64 *old = (const u64 *)_old;
3422 u64 *res = (u64 *)_res;
3423 int i;
3424
3425 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3426 u64 nv = new[i];
3427 u64 ov = old[i];
3428 s64 delta = nv - ov;
3429
3430 /* detects if this particular field is 32bit only */
3431 if (((nv | ov) >> 32) == 0)
3432 delta = (s64)(s32)((u32)nv - (u32)ov);
3433
3434 /* filter anomalies, some drivers reset their stats
3435 * at down/up events.
3436 */
3437 if (delta > 0)
3438 res[i] += delta;
3439 }
3440}
3441
3442static void bond_get_stats(struct net_device *bond_dev,
3443 struct rtnl_link_stats64 *stats)
3444{
3445 struct bonding *bond = netdev_priv(bond_dev);
3446 struct rtnl_link_stats64 temp;
3447 struct list_head *iter;
3448 struct slave *slave;
3449
3450 spin_lock(&bond->stats_lock);
3451 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3452
3453 rcu_read_lock();
3454 bond_for_each_slave_rcu(bond, slave, iter) {
3455 const struct rtnl_link_stats64 *new =
3456 dev_get_stats(slave->dev, &temp);
3457
3458 bond_fold_stats(stats, new, &slave->slave_stats);
3459
3460 /* save off the slave stats for the next run */
3461 memcpy(&slave->slave_stats, new, sizeof(*new));
3462 }
3463 rcu_read_unlock();
3464
3465 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3466 spin_unlock(&bond->stats_lock);
3467}
3468
3469static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3470{
3471 struct bonding *bond = netdev_priv(bond_dev);
3472 struct net_device *slave_dev = NULL;
3473 struct ifbond k_binfo;
3474 struct ifbond __user *u_binfo = NULL;
3475 struct ifslave k_sinfo;
3476 struct ifslave __user *u_sinfo = NULL;
3477 struct mii_ioctl_data *mii = NULL;
3478 struct bond_opt_value newval;
3479 struct net *net;
3480 int res = 0;
3481
3482 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3483
3484 switch (cmd) {
3485 case SIOCGMIIPHY:
3486 mii = if_mii(ifr);
3487 if (!mii)
3488 return -EINVAL;
3489
3490 mii->phy_id = 0;
3491 /* Fall Through */
3492 case SIOCGMIIREG:
3493 /* We do this again just in case we were called by SIOCGMIIREG
3494 * instead of SIOCGMIIPHY.
3495 */
3496 mii = if_mii(ifr);
3497 if (!mii)
3498 return -EINVAL;
3499
3500 if (mii->reg_num == 1) {
3501 mii->val_out = 0;
3502 if (netif_carrier_ok(bond->dev))
3503 mii->val_out = BMSR_LSTATUS;
3504 }
3505
3506 return 0;
3507 case BOND_INFO_QUERY_OLD:
3508 case SIOCBONDINFOQUERY:
3509 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3510
3511 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3512 return -EFAULT;
3513
3514 bond_info_query(bond_dev, &k_binfo);
3515 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3516 return -EFAULT;
3517
3518 return 0;
3519 case BOND_SLAVE_INFO_QUERY_OLD:
3520 case SIOCBONDSLAVEINFOQUERY:
3521 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3522
3523 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3524 return -EFAULT;
3525
3526 res = bond_slave_info_query(bond_dev, &k_sinfo);
3527 if (res == 0 &&
3528 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3529 return -EFAULT;
3530
3531 return res;
3532 default:
3533 break;
3534 }
3535
3536 net = dev_net(bond_dev);
3537
3538 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3539 return -EPERM;
3540
3541 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3542
3543 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3544
3545 if (!slave_dev)
3546 return -ENODEV;
3547
3548 switch (cmd) {
3549 case BOND_ENSLAVE_OLD:
3550 case SIOCBONDENSLAVE:
3551 res = bond_enslave(bond_dev, slave_dev, NULL);
3552 break;
3553 case BOND_RELEASE_OLD:
3554 case SIOCBONDRELEASE:
3555 res = bond_release(bond_dev, slave_dev);
3556 break;
3557 case BOND_SETHWADDR_OLD:
3558 case SIOCBONDSETHWADDR:
3559 res = bond_set_dev_addr(bond_dev, slave_dev);
3560 break;
3561 case BOND_CHANGE_ACTIVE_OLD:
3562 case SIOCBONDCHANGEACTIVE:
3563 bond_opt_initstr(&newval, slave_dev->name);
3564 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3565 &newval);
3566 break;
3567 default:
3568 res = -EOPNOTSUPP;
3569 }
3570
3571 return res;
3572}
3573
3574static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3575{
3576 struct bonding *bond = netdev_priv(bond_dev);
3577
3578 if (change & IFF_PROMISC)
3579 bond_set_promiscuity(bond,
3580 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3581
3582 if (change & IFF_ALLMULTI)
3583 bond_set_allmulti(bond,
3584 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3585}
3586
3587static void bond_set_rx_mode(struct net_device *bond_dev)
3588{
3589 struct bonding *bond = netdev_priv(bond_dev);
3590 struct list_head *iter;
3591 struct slave *slave;
3592
3593 rcu_read_lock();
3594 if (bond_uses_primary(bond)) {
3595 slave = rcu_dereference(bond->curr_active_slave);
3596 if (slave) {
3597 dev_uc_sync(slave->dev, bond_dev);
3598 dev_mc_sync(slave->dev, bond_dev);
3599 }
3600 } else {
3601 bond_for_each_slave_rcu(bond, slave, iter) {
3602 dev_uc_sync_multiple(slave->dev, bond_dev);
3603 dev_mc_sync_multiple(slave->dev, bond_dev);
3604 }
3605 }
3606 rcu_read_unlock();
3607}
3608
3609static int bond_neigh_init(struct neighbour *n)
3610{
3611 struct bonding *bond = netdev_priv(n->dev);
3612 const struct net_device_ops *slave_ops;
3613 struct neigh_parms parms;
3614 struct slave *slave;
3615 int ret;
3616
3617 slave = bond_first_slave(bond);
3618 if (!slave)
3619 return 0;
3620 slave_ops = slave->dev->netdev_ops;
3621 if (!slave_ops->ndo_neigh_setup)
3622 return 0;
3623
3624 parms.neigh_setup = NULL;
3625 parms.neigh_cleanup = NULL;
3626 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3627 if (ret)
3628 return ret;
3629
3630 /* Assign slave's neigh_cleanup to neighbour in case cleanup is called
3631 * after the last slave has been detached. Assumes that all slaves
3632 * utilize the same neigh_cleanup (true at this writing as only user
3633 * is ipoib).
3634 */
3635 n->parms->neigh_cleanup = parms.neigh_cleanup;
3636
3637 if (!parms.neigh_setup)
3638 return 0;
3639
3640 return parms.neigh_setup(n);
3641}
3642
3643/* The bonding ndo_neigh_setup is called at init time beofre any
3644 * slave exists. So we must declare proxy setup function which will
3645 * be used at run time to resolve the actual slave neigh param setup.
3646 *
3647 * It's also called by master devices (such as vlans) to setup their
3648 * underlying devices. In that case - do nothing, we're already set up from
3649 * our init.
3650 */
3651static int bond_neigh_setup(struct net_device *dev,
3652 struct neigh_parms *parms)
3653{
3654 /* modify only our neigh_parms */
3655 if (parms->dev == dev)
3656 parms->neigh_setup = bond_neigh_init;
3657
3658 return 0;
3659}
3660
3661/* Change the MTU of all of a master's slaves to match the master */
3662static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3663{
3664 struct bonding *bond = netdev_priv(bond_dev);
3665 struct slave *slave, *rollback_slave;
3666 struct list_head *iter;
3667 int res = 0;
3668
3669 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3670
3671 bond_for_each_slave(bond, slave, iter) {
3672 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3673 slave, slave->dev->netdev_ops->ndo_change_mtu);
3674
3675 res = dev_set_mtu(slave->dev, new_mtu);
3676
3677 if (res) {
3678 /* If we failed to set the slave's mtu to the new value
3679 * we must abort the operation even in ACTIVE_BACKUP
3680 * mode, because if we allow the backup slaves to have
3681 * different mtu values than the active slave we'll
3682 * need to change their mtu when doing a failover. That
3683 * means changing their mtu from timer context, which
3684 * is probably not a good idea.
3685 */
3686 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3687 res, new_mtu);
3688 goto unwind;
3689 }
3690 }
3691
3692 bond_dev->mtu = new_mtu;
3693
3694 return 0;
3695
3696unwind:
3697 /* unwind from head to the slave that failed */
3698 bond_for_each_slave(bond, rollback_slave, iter) {
3699 int tmp_res;
3700
3701 if (rollback_slave == slave)
3702 break;
3703
3704 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3705 if (tmp_res)
3706 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3707 tmp_res);
3708 }
3709
3710 return res;
3711}
3712
3713/* Change HW address
3714 *
3715 * Note that many devices must be down to change the HW address, and
3716 * downing the master releases all slaves. We can make bonds full of
3717 * bonding devices to test this, however.
3718 */
3719static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3720{
3721 struct bonding *bond = netdev_priv(bond_dev);
3722 struct slave *slave, *rollback_slave;
3723 struct sockaddr_storage *ss = addr, tmp_ss;
3724 struct list_head *iter;
3725 int res = 0;
3726
3727 if (BOND_MODE(bond) == BOND_MODE_ALB)
3728 return bond_alb_set_mac_address(bond_dev, addr);
3729
3730
3731 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
3732
3733 /* If fail_over_mac is enabled, do nothing and return success.
3734 * Returning an error causes ifenslave to fail.
3735 */
3736 if (bond->params.fail_over_mac &&
3737 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3738 return 0;
3739
3740 if (!is_valid_ether_addr(ss->__data))
3741 return -EADDRNOTAVAIL;
3742
3743 bond_for_each_slave(bond, slave, iter) {
3744 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
3745 __func__, slave);
3746 res = dev_set_mac_address(slave->dev, addr, NULL);
3747 if (res) {
3748 /* TODO: consider downing the slave
3749 * and retry ?
3750 * User should expect communications
3751 * breakage anyway until ARP finish
3752 * updating, so...
3753 */
3754 slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
3755 __func__, res);
3756 goto unwind;
3757 }
3758 }
3759
3760 /* success */
3761 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3762 return 0;
3763
3764unwind:
3765 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3766 tmp_ss.ss_family = bond_dev->type;
3767
3768 /* unwind from head to the slave that failed */
3769 bond_for_each_slave(bond, rollback_slave, iter) {
3770 int tmp_res;
3771
3772 if (rollback_slave == slave)
3773 break;
3774
3775 tmp_res = dev_set_mac_address(rollback_slave->dev,
3776 (struct sockaddr *)&tmp_ss, NULL);
3777 if (tmp_res) {
3778 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
3779 __func__, tmp_res);
3780 }
3781 }
3782
3783 return res;
3784}
3785
3786/**
3787 * bond_xmit_slave_id - transmit skb through slave with slave_id
3788 * @bond: bonding device that is transmitting
3789 * @skb: buffer to transmit
3790 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3791 *
3792 * This function tries to transmit through slave with slave_id but in case
3793 * it fails, it tries to find the first available slave for transmission.
3794 * The skb is consumed in all cases, thus the function is void.
3795 */
3796static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3797{
3798 struct list_head *iter;
3799 struct slave *slave;
3800 int i = slave_id;
3801
3802 /* Here we start from the slave with slave_id */
3803 bond_for_each_slave_rcu(bond, slave, iter) {
3804 if (--i < 0) {
3805 if (bond_slave_can_tx(slave)) {
3806 bond_dev_queue_xmit(bond, skb, slave->dev);
3807 return;
3808 }
3809 }
3810 }
3811
3812 /* Here we start from the first slave up to slave_id */
3813 i = slave_id;
3814 bond_for_each_slave_rcu(bond, slave, iter) {
3815 if (--i < 0)
3816 break;
3817 if (bond_slave_can_tx(slave)) {
3818 bond_dev_queue_xmit(bond, skb, slave->dev);
3819 return;
3820 }
3821 }
3822 /* no slave that can tx has been found */
3823 bond_tx_drop(bond->dev, skb);
3824}
3825
3826/**
3827 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3828 * @bond: bonding device to use
3829 *
3830 * Based on the value of the bonding device's packets_per_slave parameter
3831 * this function generates a slave id, which is usually used as the next
3832 * slave to transmit through.
3833 */
3834static u32 bond_rr_gen_slave_id(struct bonding *bond)
3835{
3836 u32 slave_id;
3837 struct reciprocal_value reciprocal_packets_per_slave;
3838 int packets_per_slave = bond->params.packets_per_slave;
3839
3840 switch (packets_per_slave) {
3841 case 0:
3842 slave_id = prandom_u32();
3843 break;
3844 case 1:
3845 slave_id = bond->rr_tx_counter;
3846 break;
3847 default:
3848 reciprocal_packets_per_slave =
3849 bond->params.reciprocal_packets_per_slave;
3850 slave_id = reciprocal_divide(bond->rr_tx_counter,
3851 reciprocal_packets_per_slave);
3852 break;
3853 }
3854 bond->rr_tx_counter++;
3855
3856 return slave_id;
3857}
3858
3859static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3860 struct net_device *bond_dev)
3861{
3862 struct bonding *bond = netdev_priv(bond_dev);
3863 struct slave *slave;
3864 int slave_cnt;
3865 u32 slave_id;
3866
3867 /* Start with the curr_active_slave that joined the bond as the
3868 * default for sending IGMP traffic. For failover purposes one
3869 * needs to maintain some consistency for the interface that will
3870 * send the join/membership reports. The curr_active_slave found
3871 * will send all of this type of traffic.
3872 */
3873 if (skb->protocol == htons(ETH_P_IP)) {
3874 int noff = skb_network_offset(skb);
3875 struct iphdr *iph;
3876
3877 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3878 goto non_igmp;
3879
3880 iph = ip_hdr(skb);
3881 if (iph->protocol == IPPROTO_IGMP) {
3882 slave = rcu_dereference(bond->curr_active_slave);
3883 if (slave)
3884 bond_dev_queue_xmit(bond, skb, slave->dev);
3885 else
3886 bond_xmit_slave_id(bond, skb, 0);
3887 return NETDEV_TX_OK;
3888 }
3889 }
3890
3891non_igmp:
3892 slave_cnt = READ_ONCE(bond->slave_cnt);
3893 if (likely(slave_cnt)) {
3894 slave_id = bond_rr_gen_slave_id(bond);
3895 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
3896 } else {
3897 bond_tx_drop(bond_dev, skb);
3898 }
3899 return NETDEV_TX_OK;
3900}
3901
3902/* In active-backup mode, we know that bond->curr_active_slave is always valid if
3903 * the bond has a usable interface.
3904 */
3905static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
3906 struct net_device *bond_dev)
3907{
3908 struct bonding *bond = netdev_priv(bond_dev);
3909 struct slave *slave;
3910
3911 slave = rcu_dereference(bond->curr_active_slave);
3912 if (slave)
3913 bond_dev_queue_xmit(bond, skb, slave->dev);
3914 else
3915 bond_tx_drop(bond_dev, skb);
3916
3917 return NETDEV_TX_OK;
3918}
3919
3920/* Use this to update slave_array when (a) it's not appropriate to update
3921 * slave_array right away (note that update_slave_array() may sleep)
3922 * and / or (b) RTNL is not held.
3923 */
3924void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
3925{
3926 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
3927}
3928
3929/* Slave array work handler. Holds only RTNL */
3930static void bond_slave_arr_handler(struct work_struct *work)
3931{
3932 struct bonding *bond = container_of(work, struct bonding,
3933 slave_arr_work.work);
3934 int ret;
3935
3936 if (!rtnl_trylock())
3937 goto err;
3938
3939 ret = bond_update_slave_arr(bond, NULL);
3940 rtnl_unlock();
3941 if (ret) {
3942 pr_warn_ratelimited("Failed to update slave array from WT\n");
3943 goto err;
3944 }
3945 return;
3946
3947err:
3948 bond_slave_arr_work_rearm(bond, 1);
3949}
3950
3951/* Build the usable slaves array in control path for modes that use xmit-hash
3952 * to determine the slave interface -
3953 * (a) BOND_MODE_8023AD
3954 * (b) BOND_MODE_XOR
3955 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
3956 *
3957 * The caller is expected to hold RTNL only and NO other lock!
3958 */
3959int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
3960{
3961 struct slave *slave;
3962 struct list_head *iter;
3963 struct bond_up_slave *new_arr, *old_arr;
3964 int agg_id = 0;
3965 int ret = 0;
3966
3967#ifdef CONFIG_LOCKDEP
3968 WARN_ON(lockdep_is_held(&bond->mode_lock));
3969#endif
3970
3971 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
3972 GFP_KERNEL);
3973 if (!new_arr) {
3974 ret = -ENOMEM;
3975 pr_err("Failed to build slave-array.\n");
3976 goto out;
3977 }
3978 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3979 struct ad_info ad_info;
3980
3981 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
3982 pr_debug("bond_3ad_get_active_agg_info failed\n");
3983 kfree_rcu(new_arr, rcu);
3984 /* No active aggragator means it's not safe to use
3985 * the previous array.
3986 */
3987 old_arr = rtnl_dereference(bond->slave_arr);
3988 if (old_arr) {
3989 RCU_INIT_POINTER(bond->slave_arr, NULL);
3990 kfree_rcu(old_arr, rcu);
3991 }
3992 goto out;
3993 }
3994 agg_id = ad_info.aggregator_id;
3995 }
3996 bond_for_each_slave(bond, slave, iter) {
3997 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3998 struct aggregator *agg;
3999
4000 agg = SLAVE_AD_INFO(slave)->port.aggregator;
4001 if (!agg || agg->aggregator_identifier != agg_id)
4002 continue;
4003 }
4004 if (!bond_slave_can_tx(slave))
4005 continue;
4006 if (skipslave == slave)
4007 continue;
4008
4009 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4010 new_arr->count);
4011
4012 new_arr->arr[new_arr->count++] = slave;
4013 }
4014
4015 old_arr = rtnl_dereference(bond->slave_arr);
4016 rcu_assign_pointer(bond->slave_arr, new_arr);
4017 if (old_arr)
4018 kfree_rcu(old_arr, rcu);
4019out:
4020 if (ret != 0 && skipslave) {
4021 int idx;
4022
4023 /* Rare situation where caller has asked to skip a specific
4024 * slave but allocation failed (most likely!). BTW this is
4025 * only possible when the call is initiated from
4026 * __bond_release_one(). In this situation; overwrite the
4027 * skipslave entry in the array with the last entry from the
4028 * array to avoid a situation where the xmit path may choose
4029 * this to-be-skipped slave to send a packet out.
4030 */
4031 old_arr = rtnl_dereference(bond->slave_arr);
4032 for (idx = 0; old_arr != NULL && idx < old_arr->count; idx++) {
4033 if (skipslave == old_arr->arr[idx]) {
4034 old_arr->arr[idx] =
4035 old_arr->arr[old_arr->count-1];
4036 old_arr->count--;
4037 break;
4038 }
4039 }
4040 }
4041 return ret;
4042}
4043
4044/* Use this Xmit function for 3AD as well as XOR modes. The current
4045 * usable slave array is formed in the control path. The xmit function
4046 * just calculates hash and sends the packet out.
4047 */
4048static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4049 struct net_device *dev)
4050{
4051 struct bonding *bond = netdev_priv(dev);
4052 struct slave *slave;
4053 struct bond_up_slave *slaves;
4054 unsigned int count;
4055
4056 slaves = rcu_dereference(bond->slave_arr);
4057 count = slaves ? READ_ONCE(slaves->count) : 0;
4058 if (likely(count)) {
4059 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4060 bond_dev_queue_xmit(bond, skb, slave->dev);
4061 } else {
4062 bond_tx_drop(dev, skb);
4063 }
4064
4065 return NETDEV_TX_OK;
4066}
4067
4068/* in broadcast mode, we send everything to all usable interfaces. */
4069static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4070 struct net_device *bond_dev)
4071{
4072 struct bonding *bond = netdev_priv(bond_dev);
4073 struct slave *slave = NULL;
4074 struct list_head *iter;
4075
4076 bond_for_each_slave_rcu(bond, slave, iter) {
4077 if (bond_is_last_slave(bond, slave))
4078 break;
4079 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4080 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4081
4082 if (!skb2) {
4083 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4084 bond_dev->name, __func__);
4085 continue;
4086 }
4087 bond_dev_queue_xmit(bond, skb2, slave->dev);
4088 }
4089 }
4090 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4091 bond_dev_queue_xmit(bond, skb, slave->dev);
4092 else
4093 bond_tx_drop(bond_dev, skb);
4094
4095 return NETDEV_TX_OK;
4096}
4097
4098/*------------------------- Device initialization ---------------------------*/
4099
4100/* Lookup the slave that corresponds to a qid */
4101static inline int bond_slave_override(struct bonding *bond,
4102 struct sk_buff *skb)
4103{
4104 struct slave *slave = NULL;
4105 struct list_head *iter;
4106
4107 if (!skb_rx_queue_recorded(skb))
4108 return 1;
4109
4110 /* Find out if any slaves have the same mapping as this skb. */
4111 bond_for_each_slave_rcu(bond, slave, iter) {
4112 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4113 if (bond_slave_is_up(slave) &&
4114 slave->link == BOND_LINK_UP) {
4115 bond_dev_queue_xmit(bond, skb, slave->dev);
4116 return 0;
4117 }
4118 /* If the slave isn't UP, use default transmit policy. */
4119 break;
4120 }
4121 }
4122
4123 return 1;
4124}
4125
4126
4127static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4128 struct net_device *sb_dev)
4129{
4130 /* This helper function exists to help dev_pick_tx get the correct
4131 * destination queue. Using a helper function skips a call to
4132 * skb_tx_hash and will put the skbs in the queue we expect on their
4133 * way down to the bonding driver.
4134 */
4135 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4136
4137 /* Save the original txq to restore before passing to the driver */
4138 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4139
4140 if (unlikely(txq >= dev->real_num_tx_queues)) {
4141 do {
4142 txq -= dev->real_num_tx_queues;
4143 } while (txq >= dev->real_num_tx_queues);
4144 }
4145 return txq;
4146}
4147
4148static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4149{
4150 struct bonding *bond = netdev_priv(dev);
4151
4152 if (bond_should_override_tx_queue(bond) &&
4153 !bond_slave_override(bond, skb))
4154 return NETDEV_TX_OK;
4155
4156 switch (BOND_MODE(bond)) {
4157 case BOND_MODE_ROUNDROBIN:
4158 return bond_xmit_roundrobin(skb, dev);
4159 case BOND_MODE_ACTIVEBACKUP:
4160 return bond_xmit_activebackup(skb, dev);
4161 case BOND_MODE_8023AD:
4162 case BOND_MODE_XOR:
4163 return bond_3ad_xor_xmit(skb, dev);
4164 case BOND_MODE_BROADCAST:
4165 return bond_xmit_broadcast(skb, dev);
4166 case BOND_MODE_ALB:
4167 return bond_alb_xmit(skb, dev);
4168 case BOND_MODE_TLB:
4169 return bond_tlb_xmit(skb, dev);
4170 default:
4171 /* Should never happen, mode already checked */
4172 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4173 WARN_ON_ONCE(1);
4174 bond_tx_drop(dev, skb);
4175 return NETDEV_TX_OK;
4176 }
4177}
4178
4179static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4180{
4181 struct bonding *bond = netdev_priv(dev);
4182 netdev_tx_t ret = NETDEV_TX_OK;
4183
4184 /* If we risk deadlock from transmitting this in the
4185 * netpoll path, tell netpoll to queue the frame for later tx
4186 */
4187 if (unlikely(is_netpoll_tx_blocked(dev)))
4188 return NETDEV_TX_BUSY;
4189
4190 rcu_read_lock();
4191 if (bond_has_slaves(bond))
4192 ret = __bond_start_xmit(skb, dev);
4193 else
4194 bond_tx_drop(dev, skb);
4195 rcu_read_unlock();
4196
4197 return ret;
4198}
4199
4200static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4201 struct ethtool_link_ksettings *cmd)
4202{
4203 struct bonding *bond = netdev_priv(bond_dev);
4204 unsigned long speed = 0;
4205 struct list_head *iter;
4206 struct slave *slave;
4207
4208 cmd->base.duplex = DUPLEX_UNKNOWN;
4209 cmd->base.port = PORT_OTHER;
4210
4211 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4212 * do not need to check mode. Though link speed might not represent
4213 * the true receive or transmit bandwidth (not all modes are symmetric)
4214 * this is an accurate maximum.
4215 */
4216 bond_for_each_slave(bond, slave, iter) {
4217 if (bond_slave_can_tx(slave)) {
4218 if (slave->speed != SPEED_UNKNOWN)
4219 speed += slave->speed;
4220 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4221 slave->duplex != DUPLEX_UNKNOWN)
4222 cmd->base.duplex = slave->duplex;
4223 }
4224 }
4225 cmd->base.speed = speed ? : SPEED_UNKNOWN;
4226
4227 return 0;
4228}
4229
4230static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4231 struct ethtool_drvinfo *drvinfo)
4232{
4233 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4234 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4235 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4236 BOND_ABI_VERSION);
4237}
4238
4239static const struct ethtool_ops bond_ethtool_ops = {
4240 .get_drvinfo = bond_ethtool_get_drvinfo,
4241 .get_link = ethtool_op_get_link,
4242 .get_link_ksettings = bond_ethtool_get_link_ksettings,
4243};
4244
4245static const struct net_device_ops bond_netdev_ops = {
4246 .ndo_init = bond_init,
4247 .ndo_uninit = bond_uninit,
4248 .ndo_open = bond_open,
4249 .ndo_stop = bond_close,
4250 .ndo_start_xmit = bond_start_xmit,
4251 .ndo_select_queue = bond_select_queue,
4252 .ndo_get_stats64 = bond_get_stats,
4253 .ndo_do_ioctl = bond_do_ioctl,
4254 .ndo_change_rx_flags = bond_change_rx_flags,
4255 .ndo_set_rx_mode = bond_set_rx_mode,
4256 .ndo_change_mtu = bond_change_mtu,
4257 .ndo_set_mac_address = bond_set_mac_address,
4258 .ndo_neigh_setup = bond_neigh_setup,
4259 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4260 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4261#ifdef CONFIG_NET_POLL_CONTROLLER
4262 .ndo_netpoll_setup = bond_netpoll_setup,
4263 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4264 .ndo_poll_controller = bond_poll_controller,
4265#endif
4266 .ndo_add_slave = bond_enslave,
4267 .ndo_del_slave = bond_release,
4268 .ndo_fix_features = bond_fix_features,
4269 .ndo_features_check = passthru_features_check,
4270};
4271
4272static const struct device_type bond_type = {
4273 .name = "bond",
4274};
4275
4276static void bond_destructor(struct net_device *bond_dev)
4277{
4278 struct bonding *bond = netdev_priv(bond_dev);
4279 if (bond->wq)
4280 destroy_workqueue(bond->wq);
4281}
4282
4283void bond_setup(struct net_device *bond_dev)
4284{
4285 struct bonding *bond = netdev_priv(bond_dev);
4286
4287 spin_lock_init(&bond->mode_lock);
4288 bond->params = bonding_defaults;
4289
4290 /* Initialize pointers */
4291 bond->dev = bond_dev;
4292
4293 /* Initialize the device entry points */
4294 ether_setup(bond_dev);
4295 bond_dev->max_mtu = ETH_MAX_MTU;
4296 bond_dev->netdev_ops = &bond_netdev_ops;
4297 bond_dev->ethtool_ops = &bond_ethtool_ops;
4298
4299 bond_dev->needs_free_netdev = true;
4300 bond_dev->priv_destructor = bond_destructor;
4301
4302 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4303
4304 /* Initialize the device options */
4305 bond_dev->flags |= IFF_MASTER;
4306 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4307 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4308
4309 /* don't acquire bond device's netif_tx_lock when transmitting */
4310 bond_dev->features |= NETIF_F_LLTX;
4311
4312 /* By default, we declare the bond to be fully
4313 * VLAN hardware accelerated capable. Special
4314 * care is taken in the various xmit functions
4315 * when there are slaves that are not hw accel
4316 * capable
4317 */
4318
4319 /* Don't allow bond devices to change network namespaces. */
4320 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4321
4322 bond_dev->hw_features = BOND_VLAN_FEATURES |
4323 NETIF_F_HW_VLAN_CTAG_RX |
4324 NETIF_F_HW_VLAN_CTAG_FILTER;
4325
4326 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4327 bond_dev->features |= bond_dev->hw_features;
4328 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4329}
4330
4331/* Destroy a bonding device.
4332 * Must be under rtnl_lock when this function is called.
4333 */
4334static void bond_uninit(struct net_device *bond_dev)
4335{
4336 struct bonding *bond = netdev_priv(bond_dev);
4337 struct list_head *iter;
4338 struct slave *slave;
4339 struct bond_up_slave *arr;
4340
4341 bond_netpoll_cleanup(bond_dev);
4342
4343 /* Release the bonded slaves */
4344 bond_for_each_slave(bond, slave, iter)
4345 __bond_release_one(bond_dev, slave->dev, true, true);
4346 netdev_info(bond_dev, "Released all slaves\n");
4347
4348 arr = rtnl_dereference(bond->slave_arr);
4349 if (arr) {
4350 RCU_INIT_POINTER(bond->slave_arr, NULL);
4351 kfree_rcu(arr, rcu);
4352 }
4353
4354 list_del(&bond->bond_list);
4355
4356 lockdep_unregister_key(&bond->stats_lock_key);
4357 bond_debug_unregister(bond);
4358}
4359
4360/*------------------------- Module initialization ---------------------------*/
4361
4362static int bond_check_params(struct bond_params *params)
4363{
4364 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4365 struct bond_opt_value newval;
4366 const struct bond_opt_value *valptr;
4367 int arp_all_targets_value = 0;
4368 u16 ad_actor_sys_prio = 0;
4369 u16 ad_user_port_key = 0;
4370 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4371 int arp_ip_count;
4372 int bond_mode = BOND_MODE_ROUNDROBIN;
4373 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4374 int lacp_fast = 0;
4375 int tlb_dynamic_lb;
4376
4377 /* Convert string parameters. */
4378 if (mode) {
4379 bond_opt_initstr(&newval, mode);
4380 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4381 if (!valptr) {
4382 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4383 return -EINVAL;
4384 }
4385 bond_mode = valptr->value;
4386 }
4387
4388 if (xmit_hash_policy) {
4389 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4390 bond_mode == BOND_MODE_ACTIVEBACKUP ||
4391 bond_mode == BOND_MODE_BROADCAST) {
4392 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4393 bond_mode_name(bond_mode));
4394 } else {
4395 bond_opt_initstr(&newval, xmit_hash_policy);
4396 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4397 &newval);
4398 if (!valptr) {
4399 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4400 xmit_hash_policy);
4401 return -EINVAL;
4402 }
4403 xmit_hashtype = valptr->value;
4404 }
4405 }
4406
4407 if (lacp_rate) {
4408 if (bond_mode != BOND_MODE_8023AD) {
4409 pr_info("lacp_rate param is irrelevant in mode %s\n",
4410 bond_mode_name(bond_mode));
4411 } else {
4412 bond_opt_initstr(&newval, lacp_rate);
4413 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4414 &newval);
4415 if (!valptr) {
4416 pr_err("Error: Invalid lacp rate \"%s\"\n",
4417 lacp_rate);
4418 return -EINVAL;
4419 }
4420 lacp_fast = valptr->value;
4421 }
4422 }
4423
4424 if (ad_select) {
4425 bond_opt_initstr(&newval, ad_select);
4426 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4427 &newval);
4428 if (!valptr) {
4429 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4430 return -EINVAL;
4431 }
4432 params->ad_select = valptr->value;
4433 if (bond_mode != BOND_MODE_8023AD)
4434 pr_warn("ad_select param only affects 802.3ad mode\n");
4435 } else {
4436 params->ad_select = BOND_AD_STABLE;
4437 }
4438
4439 if (max_bonds < 0) {
4440 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4441 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4442 max_bonds = BOND_DEFAULT_MAX_BONDS;
4443 }
4444
4445 if (miimon < 0) {
4446 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4447 miimon, INT_MAX);
4448 miimon = 0;
4449 }
4450
4451 if (updelay < 0) {
4452 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4453 updelay, INT_MAX);
4454 updelay = 0;
4455 }
4456
4457 if (downdelay < 0) {
4458 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4459 downdelay, INT_MAX);
4460 downdelay = 0;
4461 }
4462
4463 if ((use_carrier != 0) && (use_carrier != 1)) {
4464 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4465 use_carrier);
4466 use_carrier = 1;
4467 }
4468
4469 if (num_peer_notif < 0 || num_peer_notif > 255) {
4470 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4471 num_peer_notif);
4472 num_peer_notif = 1;
4473 }
4474
4475 /* reset values for 802.3ad/TLB/ALB */
4476 if (!bond_mode_uses_arp(bond_mode)) {
4477 if (!miimon) {
4478 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");
4479 pr_warn("Forcing miimon to 100msec\n");
4480 miimon = BOND_DEFAULT_MIIMON;
4481 }
4482 }
4483
4484 if (tx_queues < 1 || tx_queues > 255) {
4485 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4486 tx_queues, BOND_DEFAULT_TX_QUEUES);
4487 tx_queues = BOND_DEFAULT_TX_QUEUES;
4488 }
4489
4490 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4491 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4492 all_slaves_active);
4493 all_slaves_active = 0;
4494 }
4495
4496 if (resend_igmp < 0 || resend_igmp > 255) {
4497 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4498 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4499 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4500 }
4501
4502 bond_opt_initval(&newval, packets_per_slave);
4503 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4504 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4505 packets_per_slave, USHRT_MAX);
4506 packets_per_slave = 1;
4507 }
4508
4509 if (bond_mode == BOND_MODE_ALB) {
4510 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",
4511 updelay);
4512 }
4513
4514 if (!miimon) {
4515 if (updelay || downdelay) {
4516 /* just warn the user the up/down delay will have
4517 * no effect since miimon is zero...
4518 */
4519 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",
4520 updelay, downdelay);
4521 }
4522 } else {
4523 /* don't allow arp monitoring */
4524 if (arp_interval) {
4525 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4526 miimon, arp_interval);
4527 arp_interval = 0;
4528 }
4529
4530 if ((updelay % miimon) != 0) {
4531 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4532 updelay, miimon, (updelay / miimon) * miimon);
4533 }
4534
4535 updelay /= miimon;
4536
4537 if ((downdelay % miimon) != 0) {
4538 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4539 downdelay, miimon,
4540 (downdelay / miimon) * miimon);
4541 }
4542
4543 downdelay /= miimon;
4544 }
4545
4546 if (arp_interval < 0) {
4547 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4548 arp_interval, INT_MAX);
4549 arp_interval = 0;
4550 }
4551
4552 for (arp_ip_count = 0, i = 0;
4553 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4554 __be32 ip;
4555
4556 /* not a complete check, but good enough to catch mistakes */
4557 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4558 !bond_is_ip_target_ok(ip)) {
4559 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4560 arp_ip_target[i]);
4561 arp_interval = 0;
4562 } else {
4563 if (bond_get_targets_ip(arp_target, ip) == -1)
4564 arp_target[arp_ip_count++] = ip;
4565 else
4566 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4567 &ip);
4568 }
4569 }
4570
4571 if (arp_interval && !arp_ip_count) {
4572 /* don't allow arping if no arp_ip_target given... */
4573 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4574 arp_interval);
4575 arp_interval = 0;
4576 }
4577
4578 if (arp_validate) {
4579 if (!arp_interval) {
4580 pr_err("arp_validate requires arp_interval\n");
4581 return -EINVAL;
4582 }
4583
4584 bond_opt_initstr(&newval, arp_validate);
4585 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4586 &newval);
4587 if (!valptr) {
4588 pr_err("Error: invalid arp_validate \"%s\"\n",
4589 arp_validate);
4590 return -EINVAL;
4591 }
4592 arp_validate_value = valptr->value;
4593 } else {
4594 arp_validate_value = 0;
4595 }
4596
4597 if (arp_all_targets) {
4598 bond_opt_initstr(&newval, arp_all_targets);
4599 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4600 &newval);
4601 if (!valptr) {
4602 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4603 arp_all_targets);
4604 arp_all_targets_value = 0;
4605 } else {
4606 arp_all_targets_value = valptr->value;
4607 }
4608 }
4609
4610 if (miimon) {
4611 pr_info("MII link monitoring set to %d ms\n", miimon);
4612 } else if (arp_interval) {
4613 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4614 arp_validate_value);
4615 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4616 arp_interval, valptr->string, arp_ip_count);
4617
4618 for (i = 0; i < arp_ip_count; i++)
4619 pr_cont(" %s", arp_ip_target[i]);
4620
4621 pr_cont("\n");
4622
4623 } else if (max_bonds) {
4624 /* miimon and arp_interval not set, we need one so things
4625 * work as expected, see bonding.txt for details
4626 */
4627 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");
4628 }
4629
4630 if (primary && !bond_mode_uses_primary(bond_mode)) {
4631 /* currently, using a primary only makes sense
4632 * in active backup, TLB or ALB modes
4633 */
4634 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4635 primary, bond_mode_name(bond_mode));
4636 primary = NULL;
4637 }
4638
4639 if (primary && primary_reselect) {
4640 bond_opt_initstr(&newval, primary_reselect);
4641 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4642 &newval);
4643 if (!valptr) {
4644 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4645 primary_reselect);
4646 return -EINVAL;
4647 }
4648 primary_reselect_value = valptr->value;
4649 } else {
4650 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4651 }
4652
4653 if (fail_over_mac) {
4654 bond_opt_initstr(&newval, fail_over_mac);
4655 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4656 &newval);
4657 if (!valptr) {
4658 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4659 fail_over_mac);
4660 return -EINVAL;
4661 }
4662 fail_over_mac_value = valptr->value;
4663 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4664 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4665 } else {
4666 fail_over_mac_value = BOND_FOM_NONE;
4667 }
4668
4669 bond_opt_initstr(&newval, "default");
4670 valptr = bond_opt_parse(
4671 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4672 &newval);
4673 if (!valptr) {
4674 pr_err("Error: No ad_actor_sys_prio default value");
4675 return -EINVAL;
4676 }
4677 ad_actor_sys_prio = valptr->value;
4678
4679 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4680 &newval);
4681 if (!valptr) {
4682 pr_err("Error: No ad_user_port_key default value");
4683 return -EINVAL;
4684 }
4685 ad_user_port_key = valptr->value;
4686
4687 bond_opt_initstr(&newval, "default");
4688 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4689 if (!valptr) {
4690 pr_err("Error: No tlb_dynamic_lb default value");
4691 return -EINVAL;
4692 }
4693 tlb_dynamic_lb = valptr->value;
4694
4695 if (lp_interval == 0) {
4696 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4697 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4698 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4699 }
4700
4701 /* fill params struct with the proper values */
4702 params->mode = bond_mode;
4703 params->xmit_policy = xmit_hashtype;
4704 params->miimon = miimon;
4705 params->num_peer_notif = num_peer_notif;
4706 params->arp_interval = arp_interval;
4707 params->arp_validate = arp_validate_value;
4708 params->arp_all_targets = arp_all_targets_value;
4709 params->updelay = updelay;
4710 params->downdelay = downdelay;
4711 params->peer_notif_delay = 0;
4712 params->use_carrier = use_carrier;
4713 params->lacp_fast = lacp_fast;
4714 params->primary[0] = 0;
4715 params->primary_reselect = primary_reselect_value;
4716 params->fail_over_mac = fail_over_mac_value;
4717 params->tx_queues = tx_queues;
4718 params->all_slaves_active = all_slaves_active;
4719 params->resend_igmp = resend_igmp;
4720 params->min_links = min_links;
4721 params->lp_interval = lp_interval;
4722 params->packets_per_slave = packets_per_slave;
4723 params->tlb_dynamic_lb = tlb_dynamic_lb;
4724 params->ad_actor_sys_prio = ad_actor_sys_prio;
4725 eth_zero_addr(params->ad_actor_system);
4726 params->ad_user_port_key = ad_user_port_key;
4727 if (packets_per_slave > 0) {
4728 params->reciprocal_packets_per_slave =
4729 reciprocal_value(packets_per_slave);
4730 } else {
4731 /* reciprocal_packets_per_slave is unused if
4732 * packets_per_slave is 0 or 1, just initialize it
4733 */
4734 params->reciprocal_packets_per_slave =
4735 (struct reciprocal_value) { 0 };
4736 }
4737
4738 if (primary) {
4739 strncpy(params->primary, primary, IFNAMSIZ);
4740 params->primary[IFNAMSIZ - 1] = 0;
4741 }
4742
4743 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4744
4745 return 0;
4746}
4747
4748/* Called from registration process */
4749static int bond_init(struct net_device *bond_dev)
4750{
4751 struct bonding *bond = netdev_priv(bond_dev);
4752 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4753
4754 netdev_dbg(bond_dev, "Begin bond_init\n");
4755
4756 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4757 if (!bond->wq)
4758 return -ENOMEM;
4759
4760 spin_lock_init(&bond->stats_lock);
4761 lockdep_register_key(&bond->stats_lock_key);
4762 lockdep_set_class(&bond->stats_lock, &bond->stats_lock_key);
4763
4764 list_add_tail(&bond->bond_list, &bn->dev_list);
4765
4766 bond_prepare_sysfs_group(bond);
4767
4768 bond_debug_register(bond);
4769
4770 /* Ensure valid dev_addr */
4771 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4772 bond_dev->addr_assign_type == NET_ADDR_PERM)
4773 eth_hw_addr_random(bond_dev);
4774
4775 return 0;
4776}
4777
4778unsigned int bond_get_num_tx_queues(void)
4779{
4780 return tx_queues;
4781}
4782
4783/* Create a new bond based on the specified name and bonding parameters.
4784 * If name is NULL, obtain a suitable "bond%d" name for us.
4785 * Caller must NOT hold rtnl_lock; we need to release it here before we
4786 * set up our sysfs entries.
4787 */
4788int bond_create(struct net *net, const char *name)
4789{
4790 struct net_device *bond_dev;
4791 struct bonding *bond;
4792 struct alb_bond_info *bond_info;
4793 int res;
4794
4795 rtnl_lock();
4796
4797 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4798 name ? name : "bond%d", NET_NAME_UNKNOWN,
4799 bond_setup, tx_queues);
4800 if (!bond_dev) {
4801 pr_err("%s: eek! can't alloc netdev!\n", name);
4802 rtnl_unlock();
4803 return -ENOMEM;
4804 }
4805
4806 /*
4807 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4808 * It is set to 0 by default which is wrong.
4809 */
4810 bond = netdev_priv(bond_dev);
4811 bond_info = &(BOND_ALB_INFO(bond));
4812 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4813
4814 dev_net_set(bond_dev, net);
4815 bond_dev->rtnl_link_ops = &bond_link_ops;
4816
4817 res = register_netdevice(bond_dev);
4818
4819 netif_carrier_off(bond_dev);
4820
4821 bond_work_init_all(bond);
4822
4823 rtnl_unlock();
4824 if (res < 0)
4825 free_netdev(bond_dev);
4826 return res;
4827}
4828
4829static int __net_init bond_net_init(struct net *net)
4830{
4831 struct bond_net *bn = net_generic(net, bond_net_id);
4832
4833 bn->net = net;
4834 INIT_LIST_HEAD(&bn->dev_list);
4835
4836 bond_create_proc_dir(bn);
4837 bond_create_sysfs(bn);
4838
4839 return 0;
4840}
4841
4842static void __net_exit bond_net_exit(struct net *net)
4843{
4844 struct bond_net *bn = net_generic(net, bond_net_id);
4845 struct bonding *bond, *tmp_bond;
4846 LIST_HEAD(list);
4847
4848 bond_destroy_sysfs(bn);
4849
4850 /* Kill off any bonds created after unregistering bond rtnl ops */
4851 rtnl_lock();
4852 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4853 unregister_netdevice_queue(bond->dev, &list);
4854 unregister_netdevice_many(&list);
4855 rtnl_unlock();
4856
4857 bond_destroy_proc_dir(bn);
4858}
4859
4860static struct pernet_operations bond_net_ops = {
4861 .init = bond_net_init,
4862 .exit = bond_net_exit,
4863 .id = &bond_net_id,
4864 .size = sizeof(struct bond_net),
4865};
4866
4867static int __init bonding_init(void)
4868{
4869 int i;
4870 int res;
4871
4872 pr_info("%s", bond_version);
4873
4874 res = bond_check_params(&bonding_defaults);
4875 if (res)
4876 goto out;
4877
4878 res = register_pernet_subsys(&bond_net_ops);
4879 if (res)
4880 goto out;
4881
4882 res = bond_netlink_init();
4883 if (res)
4884 goto err_link;
4885
4886 bond_create_debugfs();
4887
4888 for (i = 0; i < max_bonds; i++) {
4889 res = bond_create(&init_net, NULL);
4890 if (res)
4891 goto err;
4892 }
4893
4894 register_netdevice_notifier(&bond_netdev_notifier);
4895out:
4896 return res;
4897err:
4898 bond_destroy_debugfs();
4899 bond_netlink_fini();
4900err_link:
4901 unregister_pernet_subsys(&bond_net_ops);
4902 goto out;
4903
4904}
4905
4906static void __exit bonding_exit(void)
4907{
4908 unregister_netdevice_notifier(&bond_netdev_notifier);
4909
4910 bond_destroy_debugfs();
4911
4912 bond_netlink_fini();
4913 unregister_pernet_subsys(&bond_net_ops);
4914
4915#ifdef CONFIG_NET_POLL_CONTROLLER
4916 /* Make sure we don't have an imbalance on our netpoll blocking */
4917 WARN_ON(atomic_read(&netpoll_block_tx));
4918#endif
4919}
4920
4921module_init(bonding_init);
4922module_exit(bonding_exit);
4923MODULE_LICENSE("GPL");
4924MODULE_VERSION(DRV_VERSION);
4925MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4926MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
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");