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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// SPDX-License-Identifier: GPL-1.0+
2/*
3 * originally based on the dummy device.
4 *
5 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
6 * Based on dummy.c, and eql.c devices.
7 *
8 * bonding.c: an Ethernet Bonding driver
9 *
10 * This is useful to talk to a Cisco EtherChannel compatible equipment:
11 * Cisco 5500
12 * Sun Trunking (Solaris)
13 * Alteon AceDirector Trunks
14 * Linux Bonding
15 * and probably many L2 switches ...
16 *
17 * How it works:
18 * ifconfig bond0 ipaddress netmask up
19 * will setup a network device, with an ip address. No mac address
20 * will be assigned at this time. The hw mac address will come from
21 * the first slave bonded to the channel. All slaves will then use
22 * this hw mac address.
23 *
24 * ifconfig bond0 down
25 * will release all slaves, marking them as down.
26 *
27 * ifenslave bond0 eth0
28 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
29 * a: be used as initial mac address
30 * b: if a hw mac address already is there, eth0's hw mac address
31 * will then be set from bond0.
32 *
33 */
34
35#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/types.h>
38#include <linux/fcntl.h>
39#include <linux/filter.h>
40#include <linux/interrupt.h>
41#include <linux/ptrace.h>
42#include <linux/ioport.h>
43#include <linux/in.h>
44#include <net/ip.h>
45#include <linux/ip.h>
46#include <linux/icmp.h>
47#include <linux/icmpv6.h>
48#include <linux/tcp.h>
49#include <linux/udp.h>
50#include <linux/slab.h>
51#include <linux/string.h>
52#include <linux/init.h>
53#include <linux/timer.h>
54#include <linux/socket.h>
55#include <linux/ctype.h>
56#include <linux/inet.h>
57#include <linux/bitops.h>
58#include <linux/io.h>
59#include <asm/dma.h>
60#include <linux/uaccess.h>
61#include <linux/errno.h>
62#include <linux/netdevice.h>
63#include <linux/inetdevice.h>
64#include <linux/igmp.h>
65#include <linux/etherdevice.h>
66#include <linux/skbuff.h>
67#include <net/sock.h>
68#include <linux/rtnetlink.h>
69#include <linux/smp.h>
70#include <linux/if_ether.h>
71#include <net/arp.h>
72#include <linux/mii.h>
73#include <linux/ethtool.h>
74#include <linux/if_vlan.h>
75#include <linux/if_bonding.h>
76#include <linux/phy.h>
77#include <linux/jiffies.h>
78#include <linux/preempt.h>
79#include <net/route.h>
80#include <net/net_namespace.h>
81#include <net/netns/generic.h>
82#include <net/pkt_sched.h>
83#include <linux/rculist.h>
84#include <net/flow_dissector.h>
85#include <net/xfrm.h>
86#include <net/bonding.h>
87#include <net/bond_3ad.h>
88#include <net/bond_alb.h>
89#if IS_ENABLED(CONFIG_TLS_DEVICE)
90#include <net/tls.h>
91#endif
92#include <net/ip6_route.h>
93#include <net/xdp.h>
94
95#include "bonding_priv.h"
96
97/*---------------------------- Module parameters ----------------------------*/
98
99/* monitor all links that often (in milliseconds). <=0 disables monitoring */
100
101static int max_bonds = BOND_DEFAULT_MAX_BONDS;
102static int tx_queues = BOND_DEFAULT_TX_QUEUES;
103static int num_peer_notif = 1;
104static int miimon;
105static int updelay;
106static int downdelay;
107static int use_carrier = 1;
108static char *mode;
109static char *primary;
110static char *primary_reselect;
111static char *lacp_rate;
112static int min_links;
113static char *ad_select;
114static char *xmit_hash_policy;
115static int arp_interval;
116static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
117static char *arp_validate;
118static char *arp_all_targets;
119static char *fail_over_mac;
120static int all_slaves_active;
121static struct bond_params bonding_defaults;
122static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
123static int packets_per_slave = 1;
124static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
125
126module_param(max_bonds, int, 0);
127MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
128module_param(tx_queues, int, 0);
129MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
130module_param_named(num_grat_arp, num_peer_notif, int, 0644);
131MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
132 "failover event (alias of num_unsol_na)");
133module_param_named(num_unsol_na, num_peer_notif, int, 0644);
134MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
135 "failover event (alias of num_grat_arp)");
136module_param(miimon, int, 0);
137MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
138module_param(updelay, int, 0);
139MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
140module_param(downdelay, int, 0);
141MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
142 "in milliseconds");
143module_param(use_carrier, int, 0);
144MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
145 "0 for off, 1 for on (default)");
146module_param(mode, charp, 0);
147MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
148 "1 for active-backup, 2 for balance-xor, "
149 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
150 "6 for balance-alb");
151module_param(primary, charp, 0);
152MODULE_PARM_DESC(primary, "Primary network device to use");
153module_param(primary_reselect, charp, 0);
154MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
155 "once it comes up; "
156 "0 for always (default), "
157 "1 for only if speed of primary is "
158 "better, "
159 "2 for only on active slave "
160 "failure");
161module_param(lacp_rate, charp, 0);
162MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
163 "0 for slow, 1 for fast");
164module_param(ad_select, charp, 0);
165MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
166 "0 for stable (default), 1 for bandwidth, "
167 "2 for count");
168module_param(min_links, int, 0);
169MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
170
171module_param(xmit_hash_policy, charp, 0);
172MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
173 "0 for layer 2 (default), 1 for layer 3+4, "
174 "2 for layer 2+3, 3 for encap layer 2+3, "
175 "4 for encap layer 3+4, 5 for vlan+srcmac");
176module_param(arp_interval, int, 0);
177MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
178module_param_array(arp_ip_target, charp, NULL, 0);
179MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
180module_param(arp_validate, charp, 0);
181MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
182 "0 for none (default), 1 for active, "
183 "2 for backup, 3 for all");
184module_param(arp_all_targets, charp, 0);
185MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
186module_param(fail_over_mac, charp, 0);
187MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
188 "the same MAC; 0 for none (default), "
189 "1 for active, 2 for follow");
190module_param(all_slaves_active, int, 0);
191MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
192 "by setting active flag for all slaves; "
193 "0 for never (default), 1 for always.");
194module_param(resend_igmp, int, 0);
195MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
196 "link failure");
197module_param(packets_per_slave, int, 0);
198MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
199 "mode; 0 for a random slave, 1 packet per "
200 "slave (default), >1 packets per slave.");
201module_param(lp_interval, uint, 0);
202MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
203 "the bonding driver sends learning packets to "
204 "each slaves peer switch. The default is 1.");
205
206/*----------------------------- Global variables ----------------------------*/
207
208#ifdef CONFIG_NET_POLL_CONTROLLER
209atomic_t netpoll_block_tx = ATOMIC_INIT(0);
210#endif
211
212unsigned int bond_net_id __read_mostly;
213
214static const struct flow_dissector_key flow_keys_bonding_keys[] = {
215 {
216 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
217 .offset = offsetof(struct flow_keys, control),
218 },
219 {
220 .key_id = FLOW_DISSECTOR_KEY_BASIC,
221 .offset = offsetof(struct flow_keys, basic),
222 },
223 {
224 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
225 .offset = offsetof(struct flow_keys, addrs.v4addrs),
226 },
227 {
228 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
229 .offset = offsetof(struct flow_keys, addrs.v6addrs),
230 },
231 {
232 .key_id = FLOW_DISSECTOR_KEY_TIPC,
233 .offset = offsetof(struct flow_keys, addrs.tipckey),
234 },
235 {
236 .key_id = FLOW_DISSECTOR_KEY_PORTS,
237 .offset = offsetof(struct flow_keys, ports),
238 },
239 {
240 .key_id = FLOW_DISSECTOR_KEY_ICMP,
241 .offset = offsetof(struct flow_keys, icmp),
242 },
243 {
244 .key_id = FLOW_DISSECTOR_KEY_VLAN,
245 .offset = offsetof(struct flow_keys, vlan),
246 },
247 {
248 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
249 .offset = offsetof(struct flow_keys, tags),
250 },
251 {
252 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
253 .offset = offsetof(struct flow_keys, keyid),
254 },
255};
256
257static struct flow_dissector flow_keys_bonding __read_mostly;
258
259/*-------------------------- Forward declarations ---------------------------*/
260
261static int bond_init(struct net_device *bond_dev);
262static void bond_uninit(struct net_device *bond_dev);
263static void bond_get_stats(struct net_device *bond_dev,
264 struct rtnl_link_stats64 *stats);
265static void bond_slave_arr_handler(struct work_struct *work);
266static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
267 int mod);
268static void bond_netdev_notify_work(struct work_struct *work);
269
270/*---------------------------- General routines -----------------------------*/
271
272const char *bond_mode_name(int mode)
273{
274 static const char *names[] = {
275 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
276 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
277 [BOND_MODE_XOR] = "load balancing (xor)",
278 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
279 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
280 [BOND_MODE_TLB] = "transmit load balancing",
281 [BOND_MODE_ALB] = "adaptive load balancing",
282 };
283
284 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
285 return "unknown";
286
287 return names[mode];
288}
289
290/**
291 * bond_dev_queue_xmit - Prepare skb for xmit.
292 *
293 * @bond: bond device that got this skb for tx.
294 * @skb: hw accel VLAN tagged skb to transmit
295 * @slave_dev: slave that is supposed to xmit this skbuff
296 */
297netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
298 struct net_device *slave_dev)
299{
300 skb->dev = slave_dev;
301
302 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
303 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
304 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
305
306 if (unlikely(netpoll_tx_running(bond->dev)))
307 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
308
309 return dev_queue_xmit(skb);
310}
311
312static bool bond_sk_check(struct bonding *bond)
313{
314 switch (BOND_MODE(bond)) {
315 case BOND_MODE_8023AD:
316 case BOND_MODE_XOR:
317 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34)
318 return true;
319 fallthrough;
320 default:
321 return false;
322 }
323}
324
325static bool bond_xdp_check(struct bonding *bond)
326{
327 switch (BOND_MODE(bond)) {
328 case BOND_MODE_ROUNDROBIN:
329 case BOND_MODE_ACTIVEBACKUP:
330 return true;
331 case BOND_MODE_8023AD:
332 case BOND_MODE_XOR:
333 /* vlan+srcmac is not supported with XDP as in most cases the 802.1q
334 * payload is not in the packet due to hardware offload.
335 */
336 if (bond->params.xmit_policy != BOND_XMIT_POLICY_VLAN_SRCMAC)
337 return true;
338 fallthrough;
339 default:
340 return false;
341 }
342}
343
344/*---------------------------------- VLAN -----------------------------------*/
345
346/* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
347 * We don't protect the slave list iteration with a lock because:
348 * a. This operation is performed in IOCTL context,
349 * b. The operation is protected by the RTNL semaphore in the 8021q code,
350 * c. Holding a lock with BH disabled while directly calling a base driver
351 * entry point is generally a BAD idea.
352 *
353 * The design of synchronization/protection for this operation in the 8021q
354 * module is good for one or more VLAN devices over a single physical device
355 * and cannot be extended for a teaming solution like bonding, so there is a
356 * potential race condition here where a net device from the vlan group might
357 * be referenced (either by a base driver or the 8021q code) while it is being
358 * removed from the system. However, it turns out we're not making matters
359 * worse, and if it works for regular VLAN usage it will work here too.
360*/
361
362/**
363 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
364 * @bond_dev: bonding net device that got called
365 * @proto: network protocol ID
366 * @vid: vlan id being added
367 */
368static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
369 __be16 proto, u16 vid)
370{
371 struct bonding *bond = netdev_priv(bond_dev);
372 struct slave *slave, *rollback_slave;
373 struct list_head *iter;
374 int res;
375
376 bond_for_each_slave(bond, slave, iter) {
377 res = vlan_vid_add(slave->dev, proto, vid);
378 if (res)
379 goto unwind;
380 }
381
382 return 0;
383
384unwind:
385 /* unwind to the slave that failed */
386 bond_for_each_slave(bond, rollback_slave, iter) {
387 if (rollback_slave == slave)
388 break;
389
390 vlan_vid_del(rollback_slave->dev, proto, vid);
391 }
392
393 return res;
394}
395
396/**
397 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
398 * @bond_dev: bonding net device that got called
399 * @proto: network protocol ID
400 * @vid: vlan id being removed
401 */
402static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
403 __be16 proto, u16 vid)
404{
405 struct bonding *bond = netdev_priv(bond_dev);
406 struct list_head *iter;
407 struct slave *slave;
408
409 bond_for_each_slave(bond, slave, iter)
410 vlan_vid_del(slave->dev, proto, vid);
411
412 if (bond_is_lb(bond))
413 bond_alb_clear_vlan(bond, vid);
414
415 return 0;
416}
417
418/*---------------------------------- XFRM -----------------------------------*/
419
420#ifdef CONFIG_XFRM_OFFLOAD
421/**
422 * bond_ipsec_dev - Get active device for IPsec offload
423 * @xs: pointer to transformer state struct
424 *
425 * Context: caller must hold rcu_read_lock.
426 *
427 * Return: the device for ipsec offload, or NULL if not exist.
428 **/
429static struct net_device *bond_ipsec_dev(struct xfrm_state *xs)
430{
431 struct net_device *bond_dev = xs->xso.dev;
432 struct bonding *bond;
433 struct slave *slave;
434
435 if (!bond_dev)
436 return NULL;
437
438 bond = netdev_priv(bond_dev);
439 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
440 return NULL;
441
442 slave = rcu_dereference(bond->curr_active_slave);
443 if (!slave)
444 return NULL;
445
446 if (!xs->xso.real_dev)
447 return NULL;
448
449 if (xs->xso.real_dev != slave->dev)
450 pr_warn_ratelimited("%s: (slave %s): not same with IPsec offload real dev %s\n",
451 bond_dev->name, slave->dev->name, xs->xso.real_dev->name);
452
453 return slave->dev;
454}
455
456/**
457 * bond_ipsec_add_sa - program device with a security association
458 * @xs: pointer to transformer state struct
459 * @extack: extack point to fill failure reason
460 **/
461static int bond_ipsec_add_sa(struct xfrm_state *xs,
462 struct netlink_ext_ack *extack)
463{
464 struct net_device *bond_dev = xs->xso.dev;
465 struct net_device *real_dev;
466 netdevice_tracker tracker;
467 struct bond_ipsec *ipsec;
468 struct bonding *bond;
469 struct slave *slave;
470 int err;
471
472 if (!bond_dev)
473 return -EINVAL;
474
475 rcu_read_lock();
476 bond = netdev_priv(bond_dev);
477 slave = rcu_dereference(bond->curr_active_slave);
478 real_dev = slave ? slave->dev : NULL;
479 netdev_hold(real_dev, &tracker, GFP_ATOMIC);
480 rcu_read_unlock();
481 if (!real_dev) {
482 err = -ENODEV;
483 goto out;
484 }
485
486 if (!real_dev->xfrmdev_ops ||
487 !real_dev->xfrmdev_ops->xdo_dev_state_add ||
488 netif_is_bond_master(real_dev)) {
489 NL_SET_ERR_MSG_MOD(extack, "Slave does not support ipsec offload");
490 err = -EINVAL;
491 goto out;
492 }
493
494 ipsec = kmalloc(sizeof(*ipsec), GFP_KERNEL);
495 if (!ipsec) {
496 err = -ENOMEM;
497 goto out;
498 }
499
500 xs->xso.real_dev = real_dev;
501 err = real_dev->xfrmdev_ops->xdo_dev_state_add(xs, extack);
502 if (!err) {
503 ipsec->xs = xs;
504 INIT_LIST_HEAD(&ipsec->list);
505 mutex_lock(&bond->ipsec_lock);
506 list_add(&ipsec->list, &bond->ipsec_list);
507 mutex_unlock(&bond->ipsec_lock);
508 } else {
509 kfree(ipsec);
510 }
511out:
512 netdev_put(real_dev, &tracker);
513 return err;
514}
515
516static void bond_ipsec_add_sa_all(struct bonding *bond)
517{
518 struct net_device *bond_dev = bond->dev;
519 struct net_device *real_dev;
520 struct bond_ipsec *ipsec;
521 struct slave *slave;
522
523 slave = rtnl_dereference(bond->curr_active_slave);
524 real_dev = slave ? slave->dev : NULL;
525 if (!real_dev)
526 return;
527
528 mutex_lock(&bond->ipsec_lock);
529 if (!real_dev->xfrmdev_ops ||
530 !real_dev->xfrmdev_ops->xdo_dev_state_add ||
531 netif_is_bond_master(real_dev)) {
532 if (!list_empty(&bond->ipsec_list))
533 slave_warn(bond_dev, real_dev,
534 "%s: no slave xdo_dev_state_add\n",
535 __func__);
536 goto out;
537 }
538
539 list_for_each_entry(ipsec, &bond->ipsec_list, list) {
540 /* If new state is added before ipsec_lock acquired */
541 if (ipsec->xs->xso.real_dev == real_dev)
542 continue;
543
544 ipsec->xs->xso.real_dev = real_dev;
545 if (real_dev->xfrmdev_ops->xdo_dev_state_add(ipsec->xs, NULL)) {
546 slave_warn(bond_dev, real_dev, "%s: failed to add SA\n", __func__);
547 ipsec->xs->xso.real_dev = NULL;
548 }
549 }
550out:
551 mutex_unlock(&bond->ipsec_lock);
552}
553
554/**
555 * bond_ipsec_del_sa - clear out this specific SA
556 * @xs: pointer to transformer state struct
557 **/
558static void bond_ipsec_del_sa(struct xfrm_state *xs)
559{
560 struct net_device *bond_dev = xs->xso.dev;
561 struct net_device *real_dev;
562 netdevice_tracker tracker;
563 struct bond_ipsec *ipsec;
564 struct bonding *bond;
565 struct slave *slave;
566
567 if (!bond_dev)
568 return;
569
570 rcu_read_lock();
571 bond = netdev_priv(bond_dev);
572 slave = rcu_dereference(bond->curr_active_slave);
573 real_dev = slave ? slave->dev : NULL;
574 netdev_hold(real_dev, &tracker, GFP_ATOMIC);
575 rcu_read_unlock();
576
577 if (!slave)
578 goto out;
579
580 if (!xs->xso.real_dev)
581 goto out;
582
583 WARN_ON(xs->xso.real_dev != real_dev);
584
585 if (!real_dev->xfrmdev_ops ||
586 !real_dev->xfrmdev_ops->xdo_dev_state_delete ||
587 netif_is_bond_master(real_dev)) {
588 slave_warn(bond_dev, real_dev, "%s: no slave xdo_dev_state_delete\n", __func__);
589 goto out;
590 }
591
592 real_dev->xfrmdev_ops->xdo_dev_state_delete(xs);
593out:
594 netdev_put(real_dev, &tracker);
595 mutex_lock(&bond->ipsec_lock);
596 list_for_each_entry(ipsec, &bond->ipsec_list, list) {
597 if (ipsec->xs == xs) {
598 list_del(&ipsec->list);
599 kfree(ipsec);
600 break;
601 }
602 }
603 mutex_unlock(&bond->ipsec_lock);
604}
605
606static void bond_ipsec_del_sa_all(struct bonding *bond)
607{
608 struct net_device *bond_dev = bond->dev;
609 struct net_device *real_dev;
610 struct bond_ipsec *ipsec;
611 struct slave *slave;
612
613 slave = rtnl_dereference(bond->curr_active_slave);
614 real_dev = slave ? slave->dev : NULL;
615 if (!real_dev)
616 return;
617
618 mutex_lock(&bond->ipsec_lock);
619 list_for_each_entry(ipsec, &bond->ipsec_list, list) {
620 if (!ipsec->xs->xso.real_dev)
621 continue;
622
623 if (!real_dev->xfrmdev_ops ||
624 !real_dev->xfrmdev_ops->xdo_dev_state_delete ||
625 netif_is_bond_master(real_dev)) {
626 slave_warn(bond_dev, real_dev,
627 "%s: no slave xdo_dev_state_delete\n",
628 __func__);
629 } else {
630 real_dev->xfrmdev_ops->xdo_dev_state_delete(ipsec->xs);
631 if (real_dev->xfrmdev_ops->xdo_dev_state_free)
632 real_dev->xfrmdev_ops->xdo_dev_state_free(ipsec->xs);
633 }
634 }
635 mutex_unlock(&bond->ipsec_lock);
636}
637
638static void bond_ipsec_free_sa(struct xfrm_state *xs)
639{
640 struct net_device *bond_dev = xs->xso.dev;
641 struct net_device *real_dev;
642 netdevice_tracker tracker;
643 struct bonding *bond;
644 struct slave *slave;
645
646 if (!bond_dev)
647 return;
648
649 rcu_read_lock();
650 bond = netdev_priv(bond_dev);
651 slave = rcu_dereference(bond->curr_active_slave);
652 real_dev = slave ? slave->dev : NULL;
653 netdev_hold(real_dev, &tracker, GFP_ATOMIC);
654 rcu_read_unlock();
655
656 if (!slave)
657 goto out;
658
659 if (!xs->xso.real_dev)
660 goto out;
661
662 WARN_ON(xs->xso.real_dev != real_dev);
663
664 if (real_dev && real_dev->xfrmdev_ops &&
665 real_dev->xfrmdev_ops->xdo_dev_state_free)
666 real_dev->xfrmdev_ops->xdo_dev_state_free(xs);
667out:
668 netdev_put(real_dev, &tracker);
669}
670
671/**
672 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
673 * @skb: current data packet
674 * @xs: pointer to transformer state struct
675 **/
676static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
677{
678 struct net_device *real_dev;
679 bool ok = false;
680
681 rcu_read_lock();
682 real_dev = bond_ipsec_dev(xs);
683 if (!real_dev)
684 goto out;
685
686 if (!real_dev->xfrmdev_ops ||
687 !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
688 netif_is_bond_master(real_dev))
689 goto out;
690
691 ok = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
692out:
693 rcu_read_unlock();
694 return ok;
695}
696
697/**
698 * bond_advance_esn_state - ESN support for IPSec HW offload
699 * @xs: pointer to transformer state struct
700 **/
701static void bond_advance_esn_state(struct xfrm_state *xs)
702{
703 struct net_device *real_dev;
704
705 rcu_read_lock();
706 real_dev = bond_ipsec_dev(xs);
707 if (!real_dev)
708 goto out;
709
710 if (!real_dev->xfrmdev_ops ||
711 !real_dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
712 pr_warn_ratelimited("%s: %s doesn't support xdo_dev_state_advance_esn\n", __func__, real_dev->name);
713 goto out;
714 }
715
716 real_dev->xfrmdev_ops->xdo_dev_state_advance_esn(xs);
717out:
718 rcu_read_unlock();
719}
720
721/**
722 * bond_xfrm_update_stats - Update xfrm state
723 * @xs: pointer to transformer state struct
724 **/
725static void bond_xfrm_update_stats(struct xfrm_state *xs)
726{
727 struct net_device *real_dev;
728
729 rcu_read_lock();
730 real_dev = bond_ipsec_dev(xs);
731 if (!real_dev)
732 goto out;
733
734 if (!real_dev->xfrmdev_ops ||
735 !real_dev->xfrmdev_ops->xdo_dev_state_update_stats) {
736 pr_warn_ratelimited("%s: %s doesn't support xdo_dev_state_update_stats\n", __func__, real_dev->name);
737 goto out;
738 }
739
740 real_dev->xfrmdev_ops->xdo_dev_state_update_stats(xs);
741out:
742 rcu_read_unlock();
743}
744
745static const struct xfrmdev_ops bond_xfrmdev_ops = {
746 .xdo_dev_state_add = bond_ipsec_add_sa,
747 .xdo_dev_state_delete = bond_ipsec_del_sa,
748 .xdo_dev_state_free = bond_ipsec_free_sa,
749 .xdo_dev_offload_ok = bond_ipsec_offload_ok,
750 .xdo_dev_state_advance_esn = bond_advance_esn_state,
751 .xdo_dev_state_update_stats = bond_xfrm_update_stats,
752};
753#endif /* CONFIG_XFRM_OFFLOAD */
754
755/*------------------------------- Link status -------------------------------*/
756
757/* Set the carrier state for the master according to the state of its
758 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
759 * do special 802.3ad magic.
760 *
761 * Returns zero if carrier state does not change, nonzero if it does.
762 */
763int bond_set_carrier(struct bonding *bond)
764{
765 struct list_head *iter;
766 struct slave *slave;
767
768 if (!bond_has_slaves(bond))
769 goto down;
770
771 if (BOND_MODE(bond) == BOND_MODE_8023AD)
772 return bond_3ad_set_carrier(bond);
773
774 bond_for_each_slave(bond, slave, iter) {
775 if (slave->link == BOND_LINK_UP) {
776 if (!netif_carrier_ok(bond->dev)) {
777 netif_carrier_on(bond->dev);
778 return 1;
779 }
780 return 0;
781 }
782 }
783
784down:
785 if (netif_carrier_ok(bond->dev)) {
786 netif_carrier_off(bond->dev);
787 return 1;
788 }
789 return 0;
790}
791
792/* Get link speed and duplex from the slave's base driver
793 * using ethtool. If for some reason the call fails or the
794 * values are invalid, set speed and duplex to -1,
795 * and return. Return 1 if speed or duplex settings are
796 * UNKNOWN; 0 otherwise.
797 */
798static int bond_update_speed_duplex(struct slave *slave)
799{
800 struct net_device *slave_dev = slave->dev;
801 struct ethtool_link_ksettings ecmd;
802 int res;
803
804 slave->speed = SPEED_UNKNOWN;
805 slave->duplex = DUPLEX_UNKNOWN;
806
807 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
808 if (res < 0)
809 return 1;
810 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
811 return 1;
812 switch (ecmd.base.duplex) {
813 case DUPLEX_FULL:
814 case DUPLEX_HALF:
815 break;
816 default:
817 return 1;
818 }
819
820 slave->speed = ecmd.base.speed;
821 slave->duplex = ecmd.base.duplex;
822
823 return 0;
824}
825
826const char *bond_slave_link_status(s8 link)
827{
828 switch (link) {
829 case BOND_LINK_UP:
830 return "up";
831 case BOND_LINK_FAIL:
832 return "going down";
833 case BOND_LINK_DOWN:
834 return "down";
835 case BOND_LINK_BACK:
836 return "going back";
837 default:
838 return "unknown";
839 }
840}
841
842/* if <dev> supports MII link status reporting, check its link status.
843 *
844 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
845 * depending upon the setting of the use_carrier parameter.
846 *
847 * Return either BMSR_LSTATUS, meaning that the link is up (or we
848 * can't tell and just pretend it is), or 0, meaning that the link is
849 * down.
850 *
851 * If reporting is non-zero, instead of faking link up, return -1 if
852 * both ETHTOOL and MII ioctls fail (meaning the device does not
853 * support them). If use_carrier is set, return whatever it says.
854 * It'd be nice if there was a good way to tell if a driver supports
855 * netif_carrier, but there really isn't.
856 */
857static int bond_check_dev_link(struct bonding *bond,
858 struct net_device *slave_dev, int reporting)
859{
860 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
861 int (*ioctl)(struct net_device *, struct ifreq *, int);
862 struct ifreq ifr;
863 struct mii_ioctl_data *mii;
864
865 if (!reporting && !netif_running(slave_dev))
866 return 0;
867
868 if (bond->params.use_carrier)
869 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
870
871 /* Try to get link status using Ethtool first. */
872 if (slave_dev->ethtool_ops->get_link)
873 return slave_dev->ethtool_ops->get_link(slave_dev) ?
874 BMSR_LSTATUS : 0;
875
876 /* Ethtool can't be used, fallback to MII ioctls. */
877 ioctl = slave_ops->ndo_eth_ioctl;
878 if (ioctl) {
879 /* TODO: set pointer to correct ioctl on a per team member
880 * bases to make this more efficient. that is, once
881 * we determine the correct ioctl, we will always
882 * call it and not the others for that team
883 * member.
884 */
885
886 /* We cannot assume that SIOCGMIIPHY will also read a
887 * register; not all network drivers (e.g., e100)
888 * support that.
889 */
890
891 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
892 strscpy_pad(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
893 mii = if_mii(&ifr);
894 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
895 mii->reg_num = MII_BMSR;
896 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
897 return mii->val_out & BMSR_LSTATUS;
898 }
899 }
900
901 /* If reporting, report that either there's no ndo_eth_ioctl,
902 * or both SIOCGMIIREG and get_link failed (meaning that we
903 * cannot report link status). If not reporting, pretend
904 * we're ok.
905 */
906 return reporting ? -1 : BMSR_LSTATUS;
907}
908
909/*----------------------------- Multicast list ------------------------------*/
910
911/* Push the promiscuity flag down to appropriate slaves */
912static int bond_set_promiscuity(struct bonding *bond, int inc)
913{
914 struct list_head *iter;
915 int err = 0;
916
917 if (bond_uses_primary(bond)) {
918 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
919
920 if (curr_active)
921 err = dev_set_promiscuity(curr_active->dev, inc);
922 } else {
923 struct slave *slave;
924
925 bond_for_each_slave(bond, slave, iter) {
926 err = dev_set_promiscuity(slave->dev, inc);
927 if (err)
928 return err;
929 }
930 }
931 return err;
932}
933
934/* Push the allmulti flag down to all slaves */
935static int bond_set_allmulti(struct bonding *bond, int inc)
936{
937 struct list_head *iter;
938 int err = 0;
939
940 if (bond_uses_primary(bond)) {
941 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
942
943 if (curr_active)
944 err = dev_set_allmulti(curr_active->dev, inc);
945 } else {
946 struct slave *slave;
947
948 bond_for_each_slave(bond, slave, iter) {
949 err = dev_set_allmulti(slave->dev, inc);
950 if (err)
951 return err;
952 }
953 }
954 return err;
955}
956
957/* Retrieve the list of registered multicast addresses for the bonding
958 * device and retransmit an IGMP JOIN request to the current active
959 * slave.
960 */
961static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
962{
963 struct bonding *bond = container_of(work, struct bonding,
964 mcast_work.work);
965
966 if (!rtnl_trylock()) {
967 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
968 return;
969 }
970 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
971
972 if (bond->igmp_retrans > 1) {
973 bond->igmp_retrans--;
974 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
975 }
976 rtnl_unlock();
977}
978
979/* Flush bond's hardware addresses from slave */
980static void bond_hw_addr_flush(struct net_device *bond_dev,
981 struct net_device *slave_dev)
982{
983 struct bonding *bond = netdev_priv(bond_dev);
984
985 dev_uc_unsync(slave_dev, bond_dev);
986 dev_mc_unsync(slave_dev, bond_dev);
987
988 if (BOND_MODE(bond) == BOND_MODE_8023AD)
989 dev_mc_del(slave_dev, lacpdu_mcast_addr);
990}
991
992/*--------------------------- Active slave change ---------------------------*/
993
994/* Update the hardware address list and promisc/allmulti for the new and
995 * old active slaves (if any). Modes that are not using primary keep all
996 * slaves up date at all times; only the modes that use primary need to call
997 * this function to swap these settings during a failover.
998 */
999static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
1000 struct slave *old_active)
1001{
1002 if (old_active) {
1003 if (bond->dev->flags & IFF_PROMISC)
1004 dev_set_promiscuity(old_active->dev, -1);
1005
1006 if (bond->dev->flags & IFF_ALLMULTI)
1007 dev_set_allmulti(old_active->dev, -1);
1008
1009 if (bond->dev->flags & IFF_UP)
1010 bond_hw_addr_flush(bond->dev, old_active->dev);
1011
1012 bond_slave_ns_maddrs_add(bond, old_active);
1013 }
1014
1015 if (new_active) {
1016 /* FIXME: Signal errors upstream. */
1017 if (bond->dev->flags & IFF_PROMISC)
1018 dev_set_promiscuity(new_active->dev, 1);
1019
1020 if (bond->dev->flags & IFF_ALLMULTI)
1021 dev_set_allmulti(new_active->dev, 1);
1022
1023 if (bond->dev->flags & IFF_UP) {
1024 netif_addr_lock_bh(bond->dev);
1025 dev_uc_sync(new_active->dev, bond->dev);
1026 dev_mc_sync(new_active->dev, bond->dev);
1027 netif_addr_unlock_bh(bond->dev);
1028 }
1029
1030 bond_slave_ns_maddrs_del(bond, new_active);
1031 }
1032}
1033
1034/**
1035 * bond_set_dev_addr - clone slave's address to bond
1036 * @bond_dev: bond net device
1037 * @slave_dev: slave net device
1038 *
1039 * Should be called with RTNL held.
1040 */
1041static int bond_set_dev_addr(struct net_device *bond_dev,
1042 struct net_device *slave_dev)
1043{
1044 int err;
1045
1046 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
1047 bond_dev, slave_dev, slave_dev->addr_len);
1048 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
1049 if (err)
1050 return err;
1051
1052 __dev_addr_set(bond_dev, slave_dev->dev_addr, slave_dev->addr_len);
1053 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
1054 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
1055 return 0;
1056}
1057
1058static struct slave *bond_get_old_active(struct bonding *bond,
1059 struct slave *new_active)
1060{
1061 struct slave *slave;
1062 struct list_head *iter;
1063
1064 bond_for_each_slave(bond, slave, iter) {
1065 if (slave == new_active)
1066 continue;
1067
1068 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
1069 return slave;
1070 }
1071
1072 return NULL;
1073}
1074
1075/* bond_do_fail_over_mac
1076 *
1077 * Perform special MAC address swapping for fail_over_mac settings
1078 *
1079 * Called with RTNL
1080 */
1081static void bond_do_fail_over_mac(struct bonding *bond,
1082 struct slave *new_active,
1083 struct slave *old_active)
1084{
1085 u8 tmp_mac[MAX_ADDR_LEN];
1086 struct sockaddr_storage ss;
1087 int rv;
1088
1089 switch (bond->params.fail_over_mac) {
1090 case BOND_FOM_ACTIVE:
1091 if (new_active) {
1092 rv = bond_set_dev_addr(bond->dev, new_active->dev);
1093 if (rv)
1094 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
1095 -rv);
1096 }
1097 break;
1098 case BOND_FOM_FOLLOW:
1099 /* if new_active && old_active, swap them
1100 * if just old_active, do nothing (going to no active slave)
1101 * if just new_active, set new_active to bond's MAC
1102 */
1103 if (!new_active)
1104 return;
1105
1106 if (!old_active)
1107 old_active = bond_get_old_active(bond, new_active);
1108
1109 if (old_active) {
1110 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
1111 new_active->dev->addr_len);
1112 bond_hw_addr_copy(ss.__data,
1113 old_active->dev->dev_addr,
1114 old_active->dev->addr_len);
1115 ss.ss_family = new_active->dev->type;
1116 } else {
1117 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
1118 bond->dev->addr_len);
1119 ss.ss_family = bond->dev->type;
1120 }
1121
1122 rv = dev_set_mac_address(new_active->dev,
1123 (struct sockaddr *)&ss, NULL);
1124 if (rv) {
1125 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
1126 -rv);
1127 goto out;
1128 }
1129
1130 if (!old_active)
1131 goto out;
1132
1133 bond_hw_addr_copy(ss.__data, tmp_mac,
1134 new_active->dev->addr_len);
1135 ss.ss_family = old_active->dev->type;
1136
1137 rv = dev_set_mac_address(old_active->dev,
1138 (struct sockaddr *)&ss, NULL);
1139 if (rv)
1140 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
1141 -rv);
1142out:
1143 break;
1144 default:
1145 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
1146 bond->params.fail_over_mac);
1147 break;
1148 }
1149
1150}
1151
1152/**
1153 * bond_choose_primary_or_current - select the primary or high priority slave
1154 * @bond: our bonding struct
1155 *
1156 * - Check if there is a primary link. If the primary link was set and is up,
1157 * go on and do link reselection.
1158 *
1159 * - If primary link is not set or down, find the highest priority link.
1160 * If the highest priority link is not current slave, set it as primary
1161 * link and do link reselection.
1162 */
1163static struct slave *bond_choose_primary_or_current(struct bonding *bond)
1164{
1165 struct slave *prim = rtnl_dereference(bond->primary_slave);
1166 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
1167 struct slave *slave, *hprio = NULL;
1168 struct list_head *iter;
1169
1170 if (!prim || prim->link != BOND_LINK_UP) {
1171 bond_for_each_slave(bond, slave, iter) {
1172 if (slave->link == BOND_LINK_UP) {
1173 hprio = hprio ?: slave;
1174 if (slave->prio > hprio->prio)
1175 hprio = slave;
1176 }
1177 }
1178
1179 if (hprio && hprio != curr) {
1180 prim = hprio;
1181 goto link_reselect;
1182 }
1183
1184 if (!curr || curr->link != BOND_LINK_UP)
1185 return NULL;
1186 return curr;
1187 }
1188
1189 if (bond->force_primary) {
1190 bond->force_primary = false;
1191 return prim;
1192 }
1193
1194link_reselect:
1195 if (!curr || curr->link != BOND_LINK_UP)
1196 return prim;
1197
1198 /* At this point, prim and curr are both up */
1199 switch (bond->params.primary_reselect) {
1200 case BOND_PRI_RESELECT_ALWAYS:
1201 return prim;
1202 case BOND_PRI_RESELECT_BETTER:
1203 if (prim->speed < curr->speed)
1204 return curr;
1205 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
1206 return curr;
1207 return prim;
1208 case BOND_PRI_RESELECT_FAILURE:
1209 return curr;
1210 default:
1211 netdev_err(bond->dev, "impossible primary_reselect %d\n",
1212 bond->params.primary_reselect);
1213 return curr;
1214 }
1215}
1216
1217/**
1218 * bond_find_best_slave - select the best available slave to be the active one
1219 * @bond: our bonding struct
1220 */
1221static struct slave *bond_find_best_slave(struct bonding *bond)
1222{
1223 struct slave *slave, *bestslave = NULL;
1224 struct list_head *iter;
1225 int mintime = bond->params.updelay;
1226
1227 slave = bond_choose_primary_or_current(bond);
1228 if (slave)
1229 return slave;
1230
1231 bond_for_each_slave(bond, slave, iter) {
1232 if (slave->link == BOND_LINK_UP)
1233 return slave;
1234 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
1235 slave->delay < mintime) {
1236 mintime = slave->delay;
1237 bestslave = slave;
1238 }
1239 }
1240
1241 return bestslave;
1242}
1243
1244/* must be called in RCU critical section or with RTNL held */
1245static bool bond_should_notify_peers(struct bonding *bond)
1246{
1247 struct slave *slave = rcu_dereference_rtnl(bond->curr_active_slave);
1248
1249 if (!slave || !bond->send_peer_notif ||
1250 bond->send_peer_notif %
1251 max(1, bond->params.peer_notif_delay) != 0 ||
1252 !netif_carrier_ok(bond->dev) ||
1253 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1254 return false;
1255
1256 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
1257 slave ? slave->dev->name : "NULL");
1258
1259 return true;
1260}
1261
1262/**
1263 * bond_change_active_slave - change the active slave into the specified one
1264 * @bond: our bonding struct
1265 * @new_active: the new slave to make the active one
1266 *
1267 * Set the new slave to the bond's settings and unset them on the old
1268 * curr_active_slave.
1269 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1270 *
1271 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1272 * because it is apparently the best available slave we have, even though its
1273 * updelay hasn't timed out yet.
1274 *
1275 * Caller must hold RTNL.
1276 */
1277void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1278{
1279 struct slave *old_active;
1280
1281 ASSERT_RTNL();
1282
1283 old_active = rtnl_dereference(bond->curr_active_slave);
1284
1285 if (old_active == new_active)
1286 return;
1287
1288#ifdef CONFIG_XFRM_OFFLOAD
1289 bond_ipsec_del_sa_all(bond);
1290#endif /* CONFIG_XFRM_OFFLOAD */
1291
1292 if (new_active) {
1293 new_active->last_link_up = jiffies;
1294
1295 if (new_active->link == BOND_LINK_BACK) {
1296 if (bond_uses_primary(bond)) {
1297 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
1298 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1299 }
1300
1301 new_active->delay = 0;
1302 bond_set_slave_link_state(new_active, BOND_LINK_UP,
1303 BOND_SLAVE_NOTIFY_NOW);
1304
1305 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1306 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1307
1308 if (bond_is_lb(bond))
1309 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1310 } else {
1311 if (bond_uses_primary(bond))
1312 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1313 }
1314 }
1315
1316 if (bond_uses_primary(bond))
1317 bond_hw_addr_swap(bond, new_active, old_active);
1318
1319 if (bond_is_lb(bond)) {
1320 bond_alb_handle_active_change(bond, new_active);
1321 if (old_active)
1322 bond_set_slave_inactive_flags(old_active,
1323 BOND_SLAVE_NOTIFY_NOW);
1324 if (new_active)
1325 bond_set_slave_active_flags(new_active,
1326 BOND_SLAVE_NOTIFY_NOW);
1327 } else {
1328 rcu_assign_pointer(bond->curr_active_slave, new_active);
1329 }
1330
1331 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1332 if (old_active)
1333 bond_set_slave_inactive_flags(old_active,
1334 BOND_SLAVE_NOTIFY_NOW);
1335
1336 if (new_active) {
1337 bool should_notify_peers = false;
1338
1339 bond_set_slave_active_flags(new_active,
1340 BOND_SLAVE_NOTIFY_NOW);
1341
1342 if (bond->params.fail_over_mac)
1343 bond_do_fail_over_mac(bond, new_active,
1344 old_active);
1345
1346 if (netif_running(bond->dev)) {
1347 bond->send_peer_notif =
1348 bond->params.num_peer_notif *
1349 max(1, bond->params.peer_notif_delay);
1350 should_notify_peers =
1351 bond_should_notify_peers(bond);
1352 }
1353
1354 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1355 if (should_notify_peers) {
1356 bond->send_peer_notif--;
1357 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1358 bond->dev);
1359 }
1360 }
1361 }
1362
1363#ifdef CONFIG_XFRM_OFFLOAD
1364 bond_ipsec_add_sa_all(bond);
1365#endif /* CONFIG_XFRM_OFFLOAD */
1366
1367 /* resend IGMP joins since active slave has changed or
1368 * all were sent on curr_active_slave.
1369 * resend only if bond is brought up with the affected
1370 * bonding modes and the retransmission is enabled
1371 */
1372 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1373 ((bond_uses_primary(bond) && new_active) ||
1374 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1375 bond->igmp_retrans = bond->params.resend_igmp;
1376 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1377 }
1378}
1379
1380/**
1381 * bond_select_active_slave - select a new active slave, if needed
1382 * @bond: our bonding struct
1383 *
1384 * This functions should be called when one of the following occurs:
1385 * - The old curr_active_slave has been released or lost its link.
1386 * - The primary_slave has got its link back.
1387 * - A slave has got its link back and there's no old curr_active_slave.
1388 *
1389 * Caller must hold RTNL.
1390 */
1391void bond_select_active_slave(struct bonding *bond)
1392{
1393 struct slave *best_slave;
1394 int rv;
1395
1396 ASSERT_RTNL();
1397
1398 best_slave = bond_find_best_slave(bond);
1399 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1400 bond_change_active_slave(bond, best_slave);
1401 rv = bond_set_carrier(bond);
1402 if (!rv)
1403 return;
1404
1405 if (netif_carrier_ok(bond->dev))
1406 netdev_info(bond->dev, "active interface up!\n");
1407 else
1408 netdev_info(bond->dev, "now running without any active interface!\n");
1409 }
1410}
1411
1412#ifdef CONFIG_NET_POLL_CONTROLLER
1413static inline int slave_enable_netpoll(struct slave *slave)
1414{
1415 struct netpoll *np;
1416 int err = 0;
1417
1418 np = kzalloc(sizeof(*np), GFP_KERNEL);
1419 err = -ENOMEM;
1420 if (!np)
1421 goto out;
1422
1423 err = __netpoll_setup(np, slave->dev);
1424 if (err) {
1425 kfree(np);
1426 goto out;
1427 }
1428 slave->np = np;
1429out:
1430 return err;
1431}
1432static inline void slave_disable_netpoll(struct slave *slave)
1433{
1434 struct netpoll *np = slave->np;
1435
1436 if (!np)
1437 return;
1438
1439 slave->np = NULL;
1440
1441 __netpoll_free(np);
1442}
1443
1444static void bond_poll_controller(struct net_device *bond_dev)
1445{
1446 struct bonding *bond = netdev_priv(bond_dev);
1447 struct slave *slave = NULL;
1448 struct list_head *iter;
1449 struct ad_info ad_info;
1450
1451 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1452 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1453 return;
1454
1455 bond_for_each_slave_rcu(bond, slave, iter) {
1456 if (!bond_slave_is_up(slave))
1457 continue;
1458
1459 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1460 struct aggregator *agg =
1461 SLAVE_AD_INFO(slave)->port.aggregator;
1462
1463 if (agg &&
1464 agg->aggregator_identifier != ad_info.aggregator_id)
1465 continue;
1466 }
1467
1468 netpoll_poll_dev(slave->dev);
1469 }
1470}
1471
1472static void bond_netpoll_cleanup(struct net_device *bond_dev)
1473{
1474 struct bonding *bond = netdev_priv(bond_dev);
1475 struct list_head *iter;
1476 struct slave *slave;
1477
1478 bond_for_each_slave(bond, slave, iter)
1479 if (bond_slave_is_up(slave))
1480 slave_disable_netpoll(slave);
1481}
1482
1483static int bond_netpoll_setup(struct net_device *dev)
1484{
1485 struct bonding *bond = netdev_priv(dev);
1486 struct list_head *iter;
1487 struct slave *slave;
1488 int err = 0;
1489
1490 bond_for_each_slave(bond, slave, iter) {
1491 err = slave_enable_netpoll(slave);
1492 if (err) {
1493 bond_netpoll_cleanup(dev);
1494 break;
1495 }
1496 }
1497 return err;
1498}
1499#else
1500static inline int slave_enable_netpoll(struct slave *slave)
1501{
1502 return 0;
1503}
1504static inline void slave_disable_netpoll(struct slave *slave)
1505{
1506}
1507static void bond_netpoll_cleanup(struct net_device *bond_dev)
1508{
1509}
1510#endif
1511
1512/*---------------------------------- IOCTL ----------------------------------*/
1513
1514static netdev_features_t bond_fix_features(struct net_device *dev,
1515 netdev_features_t features)
1516{
1517 struct bonding *bond = netdev_priv(dev);
1518 struct list_head *iter;
1519 netdev_features_t mask;
1520 struct slave *slave;
1521
1522 mask = features;
1523 features = netdev_base_features(features);
1524
1525 bond_for_each_slave(bond, slave, iter) {
1526 features = netdev_increment_features(features,
1527 slave->dev->features,
1528 mask);
1529 }
1530 features = netdev_add_tso_features(features, mask);
1531
1532 return features;
1533}
1534
1535#define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1536 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1537 NETIF_F_GSO_ENCAP_ALL | \
1538 NETIF_F_HIGHDMA | NETIF_F_LRO)
1539
1540#define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1541 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE | \
1542 NETIF_F_GSO_PARTIAL)
1543
1544#define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1545 NETIF_F_GSO_SOFTWARE)
1546
1547#define BOND_GSO_PARTIAL_FEATURES (NETIF_F_GSO_ESP)
1548
1549
1550static void bond_compute_features(struct bonding *bond)
1551{
1552 netdev_features_t gso_partial_features = BOND_GSO_PARTIAL_FEATURES;
1553 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1554 IFF_XMIT_DST_RELEASE_PERM;
1555 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1556 netdev_features_t enc_features = BOND_ENC_FEATURES;
1557#ifdef CONFIG_XFRM_OFFLOAD
1558 netdev_features_t xfrm_features = BOND_XFRM_FEATURES;
1559#endif /* CONFIG_XFRM_OFFLOAD */
1560 netdev_features_t mpls_features = BOND_MPLS_FEATURES;
1561 struct net_device *bond_dev = bond->dev;
1562 struct list_head *iter;
1563 struct slave *slave;
1564 unsigned short max_hard_header_len = ETH_HLEN;
1565 unsigned int tso_max_size = TSO_MAX_SIZE;
1566 u16 tso_max_segs = TSO_MAX_SEGS;
1567
1568 if (!bond_has_slaves(bond))
1569 goto done;
1570
1571 vlan_features = netdev_base_features(vlan_features);
1572 mpls_features = netdev_base_features(mpls_features);
1573
1574 bond_for_each_slave(bond, slave, iter) {
1575 vlan_features = netdev_increment_features(vlan_features,
1576 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1577
1578 enc_features = netdev_increment_features(enc_features,
1579 slave->dev->hw_enc_features,
1580 BOND_ENC_FEATURES);
1581
1582#ifdef CONFIG_XFRM_OFFLOAD
1583 xfrm_features = netdev_increment_features(xfrm_features,
1584 slave->dev->hw_enc_features,
1585 BOND_XFRM_FEATURES);
1586#endif /* CONFIG_XFRM_OFFLOAD */
1587
1588 gso_partial_features = netdev_increment_features(gso_partial_features,
1589 slave->dev->gso_partial_features,
1590 BOND_GSO_PARTIAL_FEATURES);
1591
1592 mpls_features = netdev_increment_features(mpls_features,
1593 slave->dev->mpls_features,
1594 BOND_MPLS_FEATURES);
1595
1596 dst_release_flag &= slave->dev->priv_flags;
1597 if (slave->dev->hard_header_len > max_hard_header_len)
1598 max_hard_header_len = slave->dev->hard_header_len;
1599
1600 tso_max_size = min(tso_max_size, slave->dev->tso_max_size);
1601 tso_max_segs = min(tso_max_segs, slave->dev->tso_max_segs);
1602 }
1603 bond_dev->hard_header_len = max_hard_header_len;
1604
1605done:
1606 bond_dev->gso_partial_features = gso_partial_features;
1607 bond_dev->vlan_features = vlan_features;
1608 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1609 NETIF_F_HW_VLAN_CTAG_TX |
1610 NETIF_F_HW_VLAN_STAG_TX;
1611#ifdef CONFIG_XFRM_OFFLOAD
1612 bond_dev->hw_enc_features |= xfrm_features;
1613#endif /* CONFIG_XFRM_OFFLOAD */
1614 bond_dev->mpls_features = mpls_features;
1615 netif_set_tso_max_segs(bond_dev, tso_max_segs);
1616 netif_set_tso_max_size(bond_dev, tso_max_size);
1617
1618 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1619 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1620 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1621 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1622
1623 netdev_change_features(bond_dev);
1624}
1625
1626static void bond_setup_by_slave(struct net_device *bond_dev,
1627 struct net_device *slave_dev)
1628{
1629 bool was_up = !!(bond_dev->flags & IFF_UP);
1630
1631 dev_close(bond_dev);
1632
1633 bond_dev->header_ops = slave_dev->header_ops;
1634
1635 bond_dev->type = slave_dev->type;
1636 bond_dev->hard_header_len = slave_dev->hard_header_len;
1637 bond_dev->needed_headroom = slave_dev->needed_headroom;
1638 bond_dev->addr_len = slave_dev->addr_len;
1639
1640 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1641 slave_dev->addr_len);
1642
1643 if (slave_dev->flags & IFF_POINTOPOINT) {
1644 bond_dev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);
1645 bond_dev->flags |= (IFF_POINTOPOINT | IFF_NOARP);
1646 }
1647 if (was_up)
1648 dev_open(bond_dev, NULL);
1649}
1650
1651/* On bonding slaves other than the currently active slave, suppress
1652 * duplicates except for alb non-mcast/bcast.
1653 */
1654static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1655 struct slave *slave,
1656 struct bonding *bond)
1657{
1658 if (bond_is_slave_inactive(slave)) {
1659 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1660 skb->pkt_type != PACKET_BROADCAST &&
1661 skb->pkt_type != PACKET_MULTICAST)
1662 return false;
1663 return true;
1664 }
1665 return false;
1666}
1667
1668static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1669{
1670 struct sk_buff *skb = *pskb;
1671 struct slave *slave;
1672 struct bonding *bond;
1673 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1674 struct slave *);
1675 int ret = RX_HANDLER_ANOTHER;
1676
1677 skb = skb_share_check(skb, GFP_ATOMIC);
1678 if (unlikely(!skb))
1679 return RX_HANDLER_CONSUMED;
1680
1681 *pskb = skb;
1682
1683 slave = bond_slave_get_rcu(skb->dev);
1684 bond = slave->bond;
1685
1686 recv_probe = READ_ONCE(bond->recv_probe);
1687 if (recv_probe) {
1688 ret = recv_probe(skb, bond, slave);
1689 if (ret == RX_HANDLER_CONSUMED) {
1690 consume_skb(skb);
1691 return ret;
1692 }
1693 }
1694
1695 /*
1696 * For packets determined by bond_should_deliver_exact_match() call to
1697 * be suppressed we want to make an exception for link-local packets.
1698 * This is necessary for e.g. LLDP daemons to be able to monitor
1699 * inactive slave links without being forced to bind to them
1700 * explicitly.
1701 *
1702 * At the same time, packets that are passed to the bonding master
1703 * (including link-local ones) can have their originating interface
1704 * determined via PACKET_ORIGDEV socket option.
1705 */
1706 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1707 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1708 return RX_HANDLER_PASS;
1709 return RX_HANDLER_EXACT;
1710 }
1711
1712 skb->dev = bond->dev;
1713
1714 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1715 netif_is_bridge_port(bond->dev) &&
1716 skb->pkt_type == PACKET_HOST) {
1717
1718 if (unlikely(skb_cow_head(skb,
1719 skb->data - skb_mac_header(skb)))) {
1720 kfree_skb(skb);
1721 return RX_HANDLER_CONSUMED;
1722 }
1723 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1724 bond->dev->addr_len);
1725 }
1726
1727 return ret;
1728}
1729
1730static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1731{
1732 switch (BOND_MODE(bond)) {
1733 case BOND_MODE_ROUNDROBIN:
1734 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1735 case BOND_MODE_ACTIVEBACKUP:
1736 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1737 case BOND_MODE_BROADCAST:
1738 return NETDEV_LAG_TX_TYPE_BROADCAST;
1739 case BOND_MODE_XOR:
1740 case BOND_MODE_8023AD:
1741 return NETDEV_LAG_TX_TYPE_HASH;
1742 default:
1743 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1744 }
1745}
1746
1747static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1748 enum netdev_lag_tx_type type)
1749{
1750 if (type != NETDEV_LAG_TX_TYPE_HASH)
1751 return NETDEV_LAG_HASH_NONE;
1752
1753 switch (bond->params.xmit_policy) {
1754 case BOND_XMIT_POLICY_LAYER2:
1755 return NETDEV_LAG_HASH_L2;
1756 case BOND_XMIT_POLICY_LAYER34:
1757 return NETDEV_LAG_HASH_L34;
1758 case BOND_XMIT_POLICY_LAYER23:
1759 return NETDEV_LAG_HASH_L23;
1760 case BOND_XMIT_POLICY_ENCAP23:
1761 return NETDEV_LAG_HASH_E23;
1762 case BOND_XMIT_POLICY_ENCAP34:
1763 return NETDEV_LAG_HASH_E34;
1764 case BOND_XMIT_POLICY_VLAN_SRCMAC:
1765 return NETDEV_LAG_HASH_VLAN_SRCMAC;
1766 default:
1767 return NETDEV_LAG_HASH_UNKNOWN;
1768 }
1769}
1770
1771static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1772 struct netlink_ext_ack *extack)
1773{
1774 struct netdev_lag_upper_info lag_upper_info;
1775 enum netdev_lag_tx_type type;
1776 int err;
1777
1778 type = bond_lag_tx_type(bond);
1779 lag_upper_info.tx_type = type;
1780 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1781
1782 err = netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1783 &lag_upper_info, extack);
1784 if (err)
1785 return err;
1786
1787 slave->dev->flags |= IFF_SLAVE;
1788 return 0;
1789}
1790
1791static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1792{
1793 netdev_upper_dev_unlink(slave->dev, bond->dev);
1794 slave->dev->flags &= ~IFF_SLAVE;
1795}
1796
1797static void slave_kobj_release(struct kobject *kobj)
1798{
1799 struct slave *slave = to_slave(kobj);
1800 struct bonding *bond = bond_get_bond_by_slave(slave);
1801
1802 cancel_delayed_work_sync(&slave->notify_work);
1803 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1804 kfree(SLAVE_AD_INFO(slave));
1805
1806 kfree(slave);
1807}
1808
1809static struct kobj_type slave_ktype = {
1810 .release = slave_kobj_release,
1811#ifdef CONFIG_SYSFS
1812 .sysfs_ops = &slave_sysfs_ops,
1813#endif
1814};
1815
1816static int bond_kobj_init(struct slave *slave)
1817{
1818 int err;
1819
1820 err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1821 &(slave->dev->dev.kobj), "bonding_slave");
1822 if (err)
1823 kobject_put(&slave->kobj);
1824
1825 return err;
1826}
1827
1828static struct slave *bond_alloc_slave(struct bonding *bond,
1829 struct net_device *slave_dev)
1830{
1831 struct slave *slave = NULL;
1832
1833 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1834 if (!slave)
1835 return NULL;
1836
1837 slave->bond = bond;
1838 slave->dev = slave_dev;
1839 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1840
1841 if (bond_kobj_init(slave))
1842 return NULL;
1843
1844 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1845 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1846 GFP_KERNEL);
1847 if (!SLAVE_AD_INFO(slave)) {
1848 kobject_put(&slave->kobj);
1849 return NULL;
1850 }
1851 }
1852
1853 return slave;
1854}
1855
1856static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1857{
1858 info->bond_mode = BOND_MODE(bond);
1859 info->miimon = bond->params.miimon;
1860 info->num_slaves = bond->slave_cnt;
1861}
1862
1863static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1864{
1865 strcpy(info->slave_name, slave->dev->name);
1866 info->link = slave->link;
1867 info->state = bond_slave_state(slave);
1868 info->link_failure_count = slave->link_failure_count;
1869}
1870
1871static void bond_netdev_notify_work(struct work_struct *_work)
1872{
1873 struct slave *slave = container_of(_work, struct slave,
1874 notify_work.work);
1875
1876 if (rtnl_trylock()) {
1877 struct netdev_bonding_info binfo;
1878
1879 bond_fill_ifslave(slave, &binfo.slave);
1880 bond_fill_ifbond(slave->bond, &binfo.master);
1881 netdev_bonding_info_change(slave->dev, &binfo);
1882 rtnl_unlock();
1883 } else {
1884 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1885 }
1886}
1887
1888void bond_queue_slave_event(struct slave *slave)
1889{
1890 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1891}
1892
1893void bond_lower_state_changed(struct slave *slave)
1894{
1895 struct netdev_lag_lower_state_info info;
1896
1897 info.link_up = slave->link == BOND_LINK_UP ||
1898 slave->link == BOND_LINK_FAIL;
1899 info.tx_enabled = bond_is_active_slave(slave);
1900 netdev_lower_state_changed(slave->dev, &info);
1901}
1902
1903#define BOND_NL_ERR(bond_dev, extack, errmsg) do { \
1904 if (extack) \
1905 NL_SET_ERR_MSG(extack, errmsg); \
1906 else \
1907 netdev_err(bond_dev, "Error: %s\n", errmsg); \
1908} while (0)
1909
1910#define SLAVE_NL_ERR(bond_dev, slave_dev, extack, errmsg) do { \
1911 if (extack) \
1912 NL_SET_ERR_MSG(extack, errmsg); \
1913 else \
1914 slave_err(bond_dev, slave_dev, "Error: %s\n", errmsg); \
1915} while (0)
1916
1917/* The bonding driver uses ether_setup() to convert a master bond device
1918 * to ARPHRD_ETHER, that resets the target netdevice's flags so we always
1919 * have to restore the IFF_MASTER flag, and only restore IFF_SLAVE and IFF_UP
1920 * if they were set
1921 */
1922static void bond_ether_setup(struct net_device *bond_dev)
1923{
1924 unsigned int flags = bond_dev->flags & (IFF_SLAVE | IFF_UP);
1925
1926 ether_setup(bond_dev);
1927 bond_dev->flags |= IFF_MASTER | flags;
1928 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1929}
1930
1931void bond_xdp_set_features(struct net_device *bond_dev)
1932{
1933 struct bonding *bond = netdev_priv(bond_dev);
1934 xdp_features_t val = NETDEV_XDP_ACT_MASK;
1935 struct list_head *iter;
1936 struct slave *slave;
1937
1938 ASSERT_RTNL();
1939
1940 if (!bond_xdp_check(bond) || !bond_has_slaves(bond)) {
1941 xdp_clear_features_flag(bond_dev);
1942 return;
1943 }
1944
1945 bond_for_each_slave(bond, slave, iter)
1946 val &= slave->dev->xdp_features;
1947
1948 val &= ~NETDEV_XDP_ACT_XSK_ZEROCOPY;
1949
1950 xdp_set_features_flag(bond_dev, val);
1951}
1952
1953/* enslave device <slave> to bond device <master> */
1954int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1955 struct netlink_ext_ack *extack)
1956{
1957 struct bonding *bond = netdev_priv(bond_dev);
1958 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1959 struct slave *new_slave = NULL, *prev_slave;
1960 struct sockaddr_storage ss;
1961 int link_reporting;
1962 int res = 0, i;
1963
1964 if (slave_dev->flags & IFF_MASTER &&
1965 !netif_is_bond_master(slave_dev)) {
1966 BOND_NL_ERR(bond_dev, extack,
1967 "Device type (master device) cannot be enslaved");
1968 return -EPERM;
1969 }
1970
1971 if (!bond->params.use_carrier &&
1972 slave_dev->ethtool_ops->get_link == NULL &&
1973 slave_ops->ndo_eth_ioctl == NULL) {
1974 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1975 }
1976
1977 /* already in-use? */
1978 if (netdev_is_rx_handler_busy(slave_dev)) {
1979 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1980 "Device is in use and cannot be enslaved");
1981 return -EBUSY;
1982 }
1983
1984 if (bond_dev == slave_dev) {
1985 BOND_NL_ERR(bond_dev, extack, "Cannot enslave bond to itself.");
1986 return -EPERM;
1987 }
1988
1989 /* vlan challenged mutual exclusion */
1990 /* no need to lock since we're protected by rtnl_lock */
1991 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1992 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1993 if (vlan_uses_dev(bond_dev)) {
1994 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
1995 "Can not enslave VLAN challenged device to VLAN enabled bond");
1996 return -EPERM;
1997 } else {
1998 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1999 }
2000 } else {
2001 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
2002 }
2003
2004 if (slave_dev->features & NETIF_F_HW_ESP)
2005 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
2006
2007 /* Old ifenslave binaries are no longer supported. These can
2008 * be identified with moderate accuracy by the state of the slave:
2009 * the current ifenslave will set the interface down prior to
2010 * enslaving it; the old ifenslave will not.
2011 */
2012 if (slave_dev->flags & IFF_UP) {
2013 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2014 "Device can not be enslaved while up");
2015 return -EPERM;
2016 }
2017
2018 /* set bonding device ether type by slave - bonding netdevices are
2019 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
2020 * there is a need to override some of the type dependent attribs/funcs.
2021 *
2022 * bond ether type mutual exclusion - don't allow slaves of dissimilar
2023 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
2024 */
2025 if (!bond_has_slaves(bond)) {
2026 if (bond_dev->type != slave_dev->type) {
2027 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
2028 bond_dev->type, slave_dev->type);
2029
2030 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
2031 bond_dev);
2032 res = notifier_to_errno(res);
2033 if (res) {
2034 slave_err(bond_dev, slave_dev, "refused to change device type\n");
2035 return -EBUSY;
2036 }
2037
2038 /* Flush unicast and multicast addresses */
2039 dev_uc_flush(bond_dev);
2040 dev_mc_flush(bond_dev);
2041
2042 if (slave_dev->type != ARPHRD_ETHER)
2043 bond_setup_by_slave(bond_dev, slave_dev);
2044 else
2045 bond_ether_setup(bond_dev);
2046
2047 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
2048 bond_dev);
2049 }
2050 } else if (bond_dev->type != slave_dev->type) {
2051 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2052 "Device type is different from other slaves");
2053 return -EINVAL;
2054 }
2055
2056 if (slave_dev->type == ARPHRD_INFINIBAND &&
2057 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2058 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2059 "Only active-backup mode is supported for infiniband slaves");
2060 res = -EOPNOTSUPP;
2061 goto err_undo_flags;
2062 }
2063
2064 if (!slave_ops->ndo_set_mac_address ||
2065 slave_dev->type == ARPHRD_INFINIBAND) {
2066 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
2067 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
2068 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2069 if (!bond_has_slaves(bond)) {
2070 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
2071 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
2072 } else {
2073 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2074 "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
2075 res = -EOPNOTSUPP;
2076 goto err_undo_flags;
2077 }
2078 }
2079 }
2080
2081 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
2082
2083 /* If this is the first slave, then we need to set the master's hardware
2084 * address to be the same as the slave's.
2085 */
2086 if (!bond_has_slaves(bond) &&
2087 bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
2088 res = bond_set_dev_addr(bond->dev, slave_dev);
2089 if (res)
2090 goto err_undo_flags;
2091 }
2092
2093 new_slave = bond_alloc_slave(bond, slave_dev);
2094 if (!new_slave) {
2095 res = -ENOMEM;
2096 goto err_undo_flags;
2097 }
2098
2099 /* Set the new_slave's queue_id to be zero. Queue ID mapping
2100 * is set via sysfs or module option if desired.
2101 */
2102 new_slave->queue_id = 0;
2103
2104 /* Save slave's original mtu and then set it to match the bond */
2105 new_slave->original_mtu = slave_dev->mtu;
2106 res = dev_set_mtu(slave_dev, bond->dev->mtu);
2107 if (res) {
2108 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
2109 goto err_free;
2110 }
2111
2112 /* Save slave's original ("permanent") mac address for modes
2113 * that need it, and for restoring it upon release, and then
2114 * set it to the master's address
2115 */
2116 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
2117 slave_dev->addr_len);
2118
2119 if (!bond->params.fail_over_mac ||
2120 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2121 /* Set slave to master's mac address. The application already
2122 * set the master's mac address to that of the first slave
2123 */
2124 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
2125 ss.ss_family = slave_dev->type;
2126 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
2127 extack);
2128 if (res) {
2129 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
2130 goto err_restore_mtu;
2131 }
2132 }
2133
2134 /* set no_addrconf flag before open to prevent IPv6 addrconf */
2135 slave_dev->priv_flags |= IFF_NO_ADDRCONF;
2136
2137 /* open the slave since the application closed it */
2138 res = dev_open(slave_dev, extack);
2139 if (res) {
2140 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
2141 goto err_restore_mac;
2142 }
2143
2144 slave_dev->priv_flags |= IFF_BONDING;
2145 /* initialize slave stats */
2146 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
2147
2148 if (bond_is_lb(bond)) {
2149 /* bond_alb_init_slave() must be called before all other stages since
2150 * it might fail and we do not want to have to undo everything
2151 */
2152 res = bond_alb_init_slave(bond, new_slave);
2153 if (res)
2154 goto err_close;
2155 }
2156
2157 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
2158 if (res) {
2159 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
2160 goto err_close;
2161 }
2162
2163 prev_slave = bond_last_slave(bond);
2164
2165 new_slave->delay = 0;
2166 new_slave->link_failure_count = 0;
2167
2168 if (bond_update_speed_duplex(new_slave) &&
2169 bond_needs_speed_duplex(bond))
2170 new_slave->link = BOND_LINK_DOWN;
2171
2172 new_slave->last_rx = jiffies -
2173 (msecs_to_jiffies(bond->params.arp_interval) + 1);
2174 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
2175 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
2176
2177 new_slave->last_tx = new_slave->last_rx;
2178
2179 if (bond->params.miimon && !bond->params.use_carrier) {
2180 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
2181
2182 if ((link_reporting == -1) && !bond->params.arp_interval) {
2183 /* miimon is set but a bonded network driver
2184 * does not support ETHTOOL/MII and
2185 * arp_interval is not set. Note: if
2186 * use_carrier is enabled, we will never go
2187 * here (because netif_carrier is always
2188 * supported); thus, we don't need to change
2189 * the messages for netif_carrier.
2190 */
2191 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");
2192 } else if (link_reporting == -1) {
2193 /* unable get link status using mii/ethtool */
2194 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");
2195 }
2196 }
2197
2198 /* check for initial state */
2199 new_slave->link = BOND_LINK_NOCHANGE;
2200 if (bond->params.miimon) {
2201 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
2202 if (bond->params.updelay) {
2203 bond_set_slave_link_state(new_slave,
2204 BOND_LINK_BACK,
2205 BOND_SLAVE_NOTIFY_NOW);
2206 new_slave->delay = bond->params.updelay;
2207 } else {
2208 bond_set_slave_link_state(new_slave,
2209 BOND_LINK_UP,
2210 BOND_SLAVE_NOTIFY_NOW);
2211 }
2212 } else {
2213 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
2214 BOND_SLAVE_NOTIFY_NOW);
2215 }
2216 } else if (bond->params.arp_interval) {
2217 bond_set_slave_link_state(new_slave,
2218 (netif_carrier_ok(slave_dev) ?
2219 BOND_LINK_UP : BOND_LINK_DOWN),
2220 BOND_SLAVE_NOTIFY_NOW);
2221 } else {
2222 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
2223 BOND_SLAVE_NOTIFY_NOW);
2224 }
2225
2226 if (new_slave->link != BOND_LINK_DOWN)
2227 new_slave->last_link_up = jiffies;
2228 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
2229 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
2230 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
2231
2232 if (bond_uses_primary(bond) && bond->params.primary[0]) {
2233 /* if there is a primary slave, remember it */
2234 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
2235 rcu_assign_pointer(bond->primary_slave, new_slave);
2236 bond->force_primary = true;
2237 }
2238 }
2239
2240 switch (BOND_MODE(bond)) {
2241 case BOND_MODE_ACTIVEBACKUP:
2242 bond_set_slave_inactive_flags(new_slave,
2243 BOND_SLAVE_NOTIFY_NOW);
2244 break;
2245 case BOND_MODE_8023AD:
2246 /* in 802.3ad mode, the internal mechanism
2247 * will activate the slaves in the selected
2248 * aggregator
2249 */
2250 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2251 /* if this is the first slave */
2252 if (!prev_slave) {
2253 SLAVE_AD_INFO(new_slave)->id = 1;
2254 /* Initialize AD with the number of times that the AD timer is called in 1 second
2255 * can be called only after the mac address of the bond is set
2256 */
2257 bond_3ad_initialize(bond);
2258 } else {
2259 SLAVE_AD_INFO(new_slave)->id =
2260 SLAVE_AD_INFO(prev_slave)->id + 1;
2261 }
2262
2263 bond_3ad_bind_slave(new_slave);
2264 break;
2265 case BOND_MODE_TLB:
2266 case BOND_MODE_ALB:
2267 bond_set_active_slave(new_slave);
2268 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
2269 break;
2270 default:
2271 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
2272
2273 /* always active in trunk mode */
2274 bond_set_active_slave(new_slave);
2275
2276 /* In trunking mode there is little meaning to curr_active_slave
2277 * anyway (it holds no special properties of the bond device),
2278 * so we can change it without calling change_active_interface()
2279 */
2280 if (!rcu_access_pointer(bond->curr_active_slave) &&
2281 new_slave->link == BOND_LINK_UP)
2282 rcu_assign_pointer(bond->curr_active_slave, new_slave);
2283
2284 break;
2285 } /* switch(bond_mode) */
2286
2287#ifdef CONFIG_NET_POLL_CONTROLLER
2288 if (bond->dev->npinfo) {
2289 if (slave_enable_netpoll(new_slave)) {
2290 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
2291 res = -EBUSY;
2292 goto err_detach;
2293 }
2294 }
2295#endif
2296
2297 if (!(bond_dev->features & NETIF_F_LRO))
2298 dev_disable_lro(slave_dev);
2299
2300 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
2301 new_slave);
2302 if (res) {
2303 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
2304 goto err_detach;
2305 }
2306
2307 res = bond_master_upper_dev_link(bond, new_slave, extack);
2308 if (res) {
2309 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
2310 goto err_unregister;
2311 }
2312
2313 bond_lower_state_changed(new_slave);
2314
2315 res = bond_sysfs_slave_add(new_slave);
2316 if (res) {
2317 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
2318 goto err_upper_unlink;
2319 }
2320
2321 /* If the mode uses primary, then the following is handled by
2322 * bond_change_active_slave().
2323 */
2324 if (!bond_uses_primary(bond)) {
2325 /* set promiscuity level to new slave */
2326 if (bond_dev->flags & IFF_PROMISC) {
2327 res = dev_set_promiscuity(slave_dev, 1);
2328 if (res)
2329 goto err_sysfs_del;
2330 }
2331
2332 /* set allmulti level to new slave */
2333 if (bond_dev->flags & IFF_ALLMULTI) {
2334 res = dev_set_allmulti(slave_dev, 1);
2335 if (res) {
2336 if (bond_dev->flags & IFF_PROMISC)
2337 dev_set_promiscuity(slave_dev, -1);
2338 goto err_sysfs_del;
2339 }
2340 }
2341
2342 if (bond_dev->flags & IFF_UP) {
2343 netif_addr_lock_bh(bond_dev);
2344 dev_mc_sync_multiple(slave_dev, bond_dev);
2345 dev_uc_sync_multiple(slave_dev, bond_dev);
2346 netif_addr_unlock_bh(bond_dev);
2347
2348 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2349 dev_mc_add(slave_dev, lacpdu_mcast_addr);
2350 }
2351 }
2352
2353 bond->slave_cnt++;
2354 bond_compute_features(bond);
2355 bond_set_carrier(bond);
2356
2357 /* Needs to be called before bond_select_active_slave(), which will
2358 * remove the maddrs if the slave is selected as active slave.
2359 */
2360 bond_slave_ns_maddrs_add(bond, new_slave);
2361
2362 if (bond_uses_primary(bond)) {
2363 block_netpoll_tx();
2364 bond_select_active_slave(bond);
2365 unblock_netpoll_tx();
2366 }
2367
2368 if (bond_mode_can_use_xmit_hash(bond))
2369 bond_update_slave_arr(bond, NULL);
2370
2371 if (!slave_dev->netdev_ops->ndo_bpf ||
2372 !slave_dev->netdev_ops->ndo_xdp_xmit) {
2373 if (bond->xdp_prog) {
2374 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2375 "Slave does not support XDP");
2376 res = -EOPNOTSUPP;
2377 goto err_sysfs_del;
2378 }
2379 } else if (bond->xdp_prog) {
2380 struct netdev_bpf xdp = {
2381 .command = XDP_SETUP_PROG,
2382 .flags = 0,
2383 .prog = bond->xdp_prog,
2384 .extack = extack,
2385 };
2386
2387 if (dev_xdp_prog_count(slave_dev) > 0) {
2388 SLAVE_NL_ERR(bond_dev, slave_dev, extack,
2389 "Slave has XDP program loaded, please unload before enslaving");
2390 res = -EOPNOTSUPP;
2391 goto err_sysfs_del;
2392 }
2393
2394 res = dev_xdp_propagate(slave_dev, &xdp);
2395 if (res < 0) {
2396 /* ndo_bpf() sets extack error message */
2397 slave_dbg(bond_dev, slave_dev, "Error %d calling ndo_bpf\n", res);
2398 goto err_sysfs_del;
2399 }
2400 if (bond->xdp_prog)
2401 bpf_prog_inc(bond->xdp_prog);
2402 }
2403
2404 bond_xdp_set_features(bond_dev);
2405
2406 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
2407 bond_is_active_slave(new_slave) ? "an active" : "a backup",
2408 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
2409
2410 /* enslave is successful */
2411 bond_queue_slave_event(new_slave);
2412 return 0;
2413
2414/* Undo stages on error */
2415err_sysfs_del:
2416 bond_sysfs_slave_del(new_slave);
2417
2418err_upper_unlink:
2419 bond_upper_dev_unlink(bond, new_slave);
2420
2421err_unregister:
2422 netdev_rx_handler_unregister(slave_dev);
2423
2424err_detach:
2425 vlan_vids_del_by_dev(slave_dev, bond_dev);
2426 if (rcu_access_pointer(bond->primary_slave) == new_slave)
2427 RCU_INIT_POINTER(bond->primary_slave, NULL);
2428 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2429 block_netpoll_tx();
2430 bond_change_active_slave(bond, NULL);
2431 bond_select_active_slave(bond);
2432 unblock_netpoll_tx();
2433 }
2434 /* either primary_slave or curr_active_slave might've changed */
2435 synchronize_rcu();
2436 slave_disable_netpoll(new_slave);
2437
2438err_close:
2439 if (!netif_is_bond_master(slave_dev))
2440 slave_dev->priv_flags &= ~IFF_BONDING;
2441 dev_close(slave_dev);
2442
2443err_restore_mac:
2444 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;
2445 if (!bond->params.fail_over_mac ||
2446 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2447 /* XXX TODO - fom follow mode needs to change master's
2448 * MAC if this slave's MAC is in use by the bond, or at
2449 * least print a warning.
2450 */
2451 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2452 new_slave->dev->addr_len);
2453 ss.ss_family = slave_dev->type;
2454 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2455 }
2456
2457err_restore_mtu:
2458 dev_set_mtu(slave_dev, new_slave->original_mtu);
2459
2460err_free:
2461 kobject_put(&new_slave->kobj);
2462
2463err_undo_flags:
2464 /* Enslave of first slave has failed and we need to fix master's mac */
2465 if (!bond_has_slaves(bond)) {
2466 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2467 slave_dev->dev_addr))
2468 eth_hw_addr_random(bond_dev);
2469 if (bond_dev->type != ARPHRD_ETHER) {
2470 dev_close(bond_dev);
2471 bond_ether_setup(bond_dev);
2472 }
2473 }
2474
2475 return res;
2476}
2477
2478/* Try to release the slave device <slave> from the bond device <master>
2479 * It is legal to access curr_active_slave without a lock because all the function
2480 * is RTNL-locked. If "all" is true it means that the function is being called
2481 * while destroying a bond interface and all slaves are being released.
2482 *
2483 * The rules for slave state should be:
2484 * for Active/Backup:
2485 * Active stays on all backups go down
2486 * for Bonded connections:
2487 * The first up interface should be left on and all others downed.
2488 */
2489static int __bond_release_one(struct net_device *bond_dev,
2490 struct net_device *slave_dev,
2491 bool all, bool unregister)
2492{
2493 struct bonding *bond = netdev_priv(bond_dev);
2494 struct slave *slave, *oldcurrent;
2495 struct sockaddr_storage ss;
2496 int old_flags = bond_dev->flags;
2497 netdev_features_t old_features = bond_dev->features;
2498
2499 /* slave is not a slave or master is not master of this slave */
2500 if (!(slave_dev->flags & IFF_SLAVE) ||
2501 !netdev_has_upper_dev(slave_dev, bond_dev)) {
2502 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2503 return -EINVAL;
2504 }
2505
2506 block_netpoll_tx();
2507
2508 slave = bond_get_slave_by_dev(bond, slave_dev);
2509 if (!slave) {
2510 /* not a slave of this bond */
2511 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2512 unblock_netpoll_tx();
2513 return -EINVAL;
2514 }
2515
2516 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2517
2518 bond_sysfs_slave_del(slave);
2519
2520 /* recompute stats just before removing the slave */
2521 bond_get_stats(bond->dev, &bond->bond_stats);
2522
2523 if (bond->xdp_prog) {
2524 struct netdev_bpf xdp = {
2525 .command = XDP_SETUP_PROG,
2526 .flags = 0,
2527 .prog = NULL,
2528 .extack = NULL,
2529 };
2530 if (dev_xdp_propagate(slave_dev, &xdp))
2531 slave_warn(bond_dev, slave_dev, "failed to unload XDP program\n");
2532 }
2533
2534 /* unregister rx_handler early so bond_handle_frame wouldn't be called
2535 * for this slave anymore.
2536 */
2537 netdev_rx_handler_unregister(slave_dev);
2538
2539 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2540 bond_3ad_unbind_slave(slave);
2541
2542 bond_upper_dev_unlink(bond, slave);
2543
2544 if (bond_mode_can_use_xmit_hash(bond))
2545 bond_update_slave_arr(bond, slave);
2546
2547 slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2548 bond_is_active_slave(slave) ? "active" : "backup");
2549
2550 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2551
2552 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2553
2554 if (!all && (!bond->params.fail_over_mac ||
2555 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2556 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2557 bond_has_slaves(bond))
2558 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",
2559 slave->perm_hwaddr);
2560 }
2561
2562 if (rtnl_dereference(bond->primary_slave) == slave)
2563 RCU_INIT_POINTER(bond->primary_slave, NULL);
2564
2565 if (oldcurrent == slave)
2566 bond_change_active_slave(bond, NULL);
2567
2568 /* Must be called after bond_change_active_slave () as the slave
2569 * might change from an active slave to a backup slave. Then it is
2570 * necessary to clear the maddrs on the backup slave.
2571 */
2572 bond_slave_ns_maddrs_del(bond, slave);
2573
2574 if (bond_is_lb(bond)) {
2575 /* Must be called only after the slave has been
2576 * detached from the list and the curr_active_slave
2577 * has been cleared (if our_slave == old_current),
2578 * but before a new active slave is selected.
2579 */
2580 bond_alb_deinit_slave(bond, slave);
2581 }
2582
2583 if (all) {
2584 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2585 } else if (oldcurrent == slave) {
2586 /* Note that we hold RTNL over this sequence, so there
2587 * is no concern that another slave add/remove event
2588 * will interfere.
2589 */
2590 bond_select_active_slave(bond);
2591 }
2592
2593 bond_set_carrier(bond);
2594 if (!bond_has_slaves(bond))
2595 eth_hw_addr_random(bond_dev);
2596
2597 unblock_netpoll_tx();
2598 synchronize_rcu();
2599 bond->slave_cnt--;
2600
2601 if (!bond_has_slaves(bond)) {
2602 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2603 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2604 }
2605
2606 bond_compute_features(bond);
2607 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2608 (old_features & NETIF_F_VLAN_CHALLENGED))
2609 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2610
2611 vlan_vids_del_by_dev(slave_dev, bond_dev);
2612
2613 /* If the mode uses primary, then this case was handled above by
2614 * bond_change_active_slave(..., NULL)
2615 */
2616 if (!bond_uses_primary(bond)) {
2617 /* unset promiscuity level from slave
2618 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2619 * of the IFF_PROMISC flag in the bond_dev, but we need the
2620 * value of that flag before that change, as that was the value
2621 * when this slave was attached, so we cache at the start of the
2622 * function and use it here. Same goes for ALLMULTI below
2623 */
2624 if (old_flags & IFF_PROMISC)
2625 dev_set_promiscuity(slave_dev, -1);
2626
2627 /* unset allmulti level from slave */
2628 if (old_flags & IFF_ALLMULTI)
2629 dev_set_allmulti(slave_dev, -1);
2630
2631 if (old_flags & IFF_UP)
2632 bond_hw_addr_flush(bond_dev, slave_dev);
2633 }
2634
2635 slave_disable_netpoll(slave);
2636
2637 /* close slave before restoring its mac address */
2638 dev_close(slave_dev);
2639
2640 slave_dev->priv_flags &= ~IFF_NO_ADDRCONF;
2641
2642 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2643 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2644 /* restore original ("permanent") mac address */
2645 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2646 slave->dev->addr_len);
2647 ss.ss_family = slave_dev->type;
2648 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2649 }
2650
2651 if (unregister)
2652 __dev_set_mtu(slave_dev, slave->original_mtu);
2653 else
2654 dev_set_mtu(slave_dev, slave->original_mtu);
2655
2656 if (!netif_is_bond_master(slave_dev))
2657 slave_dev->priv_flags &= ~IFF_BONDING;
2658
2659 bond_xdp_set_features(bond_dev);
2660 kobject_put(&slave->kobj);
2661
2662 return 0;
2663}
2664
2665/* A wrapper used because of ndo_del_link */
2666int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2667{
2668 return __bond_release_one(bond_dev, slave_dev, false, false);
2669}
2670
2671/* First release a slave and then destroy the bond if no more slaves are left.
2672 * Must be under rtnl_lock when this function is called.
2673 */
2674static int bond_release_and_destroy(struct net_device *bond_dev,
2675 struct net_device *slave_dev)
2676{
2677 struct bonding *bond = netdev_priv(bond_dev);
2678 int ret;
2679
2680 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2681 if (ret == 0 && !bond_has_slaves(bond) &&
2682 bond_dev->reg_state != NETREG_UNREGISTERING) {
2683 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2684 netdev_info(bond_dev, "Destroying bond\n");
2685 bond_remove_proc_entry(bond);
2686 unregister_netdevice(bond_dev);
2687 }
2688 return ret;
2689}
2690
2691static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2692{
2693 struct bonding *bond = netdev_priv(bond_dev);
2694
2695 bond_fill_ifbond(bond, info);
2696}
2697
2698static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2699{
2700 struct bonding *bond = netdev_priv(bond_dev);
2701 struct list_head *iter;
2702 int i = 0, res = -ENODEV;
2703 struct slave *slave;
2704
2705 bond_for_each_slave(bond, slave, iter) {
2706 if (i++ == (int)info->slave_id) {
2707 res = 0;
2708 bond_fill_ifslave(slave, info);
2709 break;
2710 }
2711 }
2712
2713 return res;
2714}
2715
2716/*-------------------------------- Monitoring -------------------------------*/
2717
2718/* called with rcu_read_lock() */
2719static int bond_miimon_inspect(struct bonding *bond)
2720{
2721 bool ignore_updelay = false;
2722 int link_state, commit = 0;
2723 struct list_head *iter;
2724 struct slave *slave;
2725
2726 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
2727 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2728 } else {
2729 struct bond_up_slave *usable_slaves;
2730
2731 usable_slaves = rcu_dereference(bond->usable_slaves);
2732
2733 if (usable_slaves && usable_slaves->count == 0)
2734 ignore_updelay = true;
2735 }
2736
2737 bond_for_each_slave_rcu(bond, slave, iter) {
2738 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2739
2740 link_state = bond_check_dev_link(bond, slave->dev, 0);
2741
2742 switch (slave->link) {
2743 case BOND_LINK_UP:
2744 if (link_state)
2745 continue;
2746
2747 bond_propose_link_state(slave, BOND_LINK_FAIL);
2748 commit++;
2749 slave->delay = bond->params.downdelay;
2750 if (slave->delay && net_ratelimit()) {
2751 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2752 (BOND_MODE(bond) ==
2753 BOND_MODE_ACTIVEBACKUP) ?
2754 (bond_is_active_slave(slave) ?
2755 "active " : "backup ") : "",
2756 bond->params.downdelay * bond->params.miimon);
2757 }
2758 fallthrough;
2759 case BOND_LINK_FAIL:
2760 if (link_state) {
2761 /* recovered before downdelay expired */
2762 bond_propose_link_state(slave, BOND_LINK_UP);
2763 slave->last_link_up = jiffies;
2764 if (net_ratelimit())
2765 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2766 (bond->params.downdelay - slave->delay) *
2767 bond->params.miimon);
2768 commit++;
2769 continue;
2770 }
2771
2772 if (slave->delay <= 0) {
2773 bond_propose_link_state(slave, BOND_LINK_DOWN);
2774 commit++;
2775 continue;
2776 }
2777
2778 slave->delay--;
2779 break;
2780
2781 case BOND_LINK_DOWN:
2782 if (!link_state)
2783 continue;
2784
2785 bond_propose_link_state(slave, BOND_LINK_BACK);
2786 commit++;
2787 slave->delay = bond->params.updelay;
2788
2789 if (slave->delay && net_ratelimit()) {
2790 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2791 ignore_updelay ? 0 :
2792 bond->params.updelay *
2793 bond->params.miimon);
2794 }
2795 fallthrough;
2796 case BOND_LINK_BACK:
2797 if (!link_state) {
2798 bond_propose_link_state(slave, BOND_LINK_DOWN);
2799 if (net_ratelimit())
2800 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2801 (bond->params.updelay - slave->delay) *
2802 bond->params.miimon);
2803 commit++;
2804 continue;
2805 }
2806
2807 if (ignore_updelay)
2808 slave->delay = 0;
2809
2810 if (slave->delay <= 0) {
2811 bond_propose_link_state(slave, BOND_LINK_UP);
2812 commit++;
2813 ignore_updelay = false;
2814 continue;
2815 }
2816
2817 slave->delay--;
2818 break;
2819 }
2820 }
2821
2822 return commit;
2823}
2824
2825static void bond_miimon_link_change(struct bonding *bond,
2826 struct slave *slave,
2827 char link)
2828{
2829 switch (BOND_MODE(bond)) {
2830 case BOND_MODE_8023AD:
2831 bond_3ad_handle_link_change(slave, link);
2832 break;
2833 case BOND_MODE_TLB:
2834 case BOND_MODE_ALB:
2835 bond_alb_handle_link_change(bond, slave, link);
2836 break;
2837 case BOND_MODE_XOR:
2838 bond_update_slave_arr(bond, NULL);
2839 break;
2840 }
2841}
2842
2843static void bond_miimon_commit(struct bonding *bond)
2844{
2845 struct slave *slave, *primary, *active;
2846 bool do_failover = false;
2847 struct list_head *iter;
2848
2849 ASSERT_RTNL();
2850
2851 bond_for_each_slave(bond, slave, iter) {
2852 switch (slave->link_new_state) {
2853 case BOND_LINK_NOCHANGE:
2854 /* For 802.3ad mode, check current slave speed and
2855 * duplex again in case its port was disabled after
2856 * invalid speed/duplex reporting but recovered before
2857 * link monitoring could make a decision on the actual
2858 * link status
2859 */
2860 if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2861 slave->link == BOND_LINK_UP)
2862 bond_3ad_adapter_speed_duplex_changed(slave);
2863 continue;
2864
2865 case BOND_LINK_UP:
2866 if (bond_update_speed_duplex(slave) &&
2867 bond_needs_speed_duplex(bond)) {
2868 slave->link = BOND_LINK_DOWN;
2869 if (net_ratelimit())
2870 slave_warn(bond->dev, slave->dev,
2871 "failed to get link speed/duplex\n");
2872 continue;
2873 }
2874 bond_set_slave_link_state(slave, BOND_LINK_UP,
2875 BOND_SLAVE_NOTIFY_NOW);
2876 slave->last_link_up = jiffies;
2877
2878 primary = rtnl_dereference(bond->primary_slave);
2879 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2880 /* prevent it from being the active one */
2881 bond_set_backup_slave(slave);
2882 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2883 /* make it immediately active */
2884 bond_set_active_slave(slave);
2885 }
2886
2887 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2888 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2889 slave->duplex ? "full" : "half");
2890
2891 bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2892
2893 active = rtnl_dereference(bond->curr_active_slave);
2894 if (!active || slave == primary || slave->prio > active->prio)
2895 do_failover = true;
2896
2897 continue;
2898
2899 case BOND_LINK_DOWN:
2900 if (slave->link_failure_count < UINT_MAX)
2901 slave->link_failure_count++;
2902
2903 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2904 BOND_SLAVE_NOTIFY_NOW);
2905
2906 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2907 BOND_MODE(bond) == BOND_MODE_8023AD)
2908 bond_set_slave_inactive_flags(slave,
2909 BOND_SLAVE_NOTIFY_NOW);
2910
2911 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2912
2913 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2914
2915 if (slave == rcu_access_pointer(bond->curr_active_slave))
2916 do_failover = true;
2917
2918 continue;
2919
2920 default:
2921 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2922 slave->link_new_state);
2923 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2924
2925 continue;
2926 }
2927 }
2928
2929 if (do_failover) {
2930 block_netpoll_tx();
2931 bond_select_active_slave(bond);
2932 unblock_netpoll_tx();
2933 }
2934
2935 bond_set_carrier(bond);
2936}
2937
2938/* bond_mii_monitor
2939 *
2940 * Really a wrapper that splits the mii monitor into two phases: an
2941 * inspection, then (if inspection indicates something needs to be done)
2942 * an acquisition of appropriate locks followed by a commit phase to
2943 * implement whatever link state changes are indicated.
2944 */
2945static void bond_mii_monitor(struct work_struct *work)
2946{
2947 struct bonding *bond = container_of(work, struct bonding,
2948 mii_work.work);
2949 bool should_notify_peers = false;
2950 bool commit;
2951 unsigned long delay;
2952 struct slave *slave;
2953 struct list_head *iter;
2954
2955 delay = msecs_to_jiffies(bond->params.miimon);
2956
2957 if (!bond_has_slaves(bond))
2958 goto re_arm;
2959
2960 rcu_read_lock();
2961 should_notify_peers = bond_should_notify_peers(bond);
2962 commit = !!bond_miimon_inspect(bond);
2963 if (bond->send_peer_notif) {
2964 rcu_read_unlock();
2965 if (rtnl_trylock()) {
2966 bond->send_peer_notif--;
2967 rtnl_unlock();
2968 }
2969 } else {
2970 rcu_read_unlock();
2971 }
2972
2973 if (commit) {
2974 /* Race avoidance with bond_close cancel of workqueue */
2975 if (!rtnl_trylock()) {
2976 delay = 1;
2977 should_notify_peers = false;
2978 goto re_arm;
2979 }
2980
2981 bond_for_each_slave(bond, slave, iter) {
2982 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2983 }
2984 bond_miimon_commit(bond);
2985
2986 rtnl_unlock(); /* might sleep, hold no other locks */
2987 }
2988
2989re_arm:
2990 if (bond->params.miimon)
2991 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2992
2993 if (should_notify_peers) {
2994 if (!rtnl_trylock())
2995 return;
2996 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2997 rtnl_unlock();
2998 }
2999}
3000
3001static int bond_upper_dev_walk(struct net_device *upper,
3002 struct netdev_nested_priv *priv)
3003{
3004 __be32 ip = *(__be32 *)priv->data;
3005
3006 return ip == bond_confirm_addr(upper, 0, ip);
3007}
3008
3009static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
3010{
3011 struct netdev_nested_priv priv = {
3012 .data = (void *)&ip,
3013 };
3014 bool ret = false;
3015
3016 if (ip == bond_confirm_addr(bond->dev, 0, ip))
3017 return true;
3018
3019 rcu_read_lock();
3020 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
3021 ret = true;
3022 rcu_read_unlock();
3023
3024 return ret;
3025}
3026
3027#define BOND_VLAN_PROTO_NONE cpu_to_be16(0xffff)
3028
3029static bool bond_handle_vlan(struct slave *slave, struct bond_vlan_tag *tags,
3030 struct sk_buff *skb)
3031{
3032 struct net_device *bond_dev = slave->bond->dev;
3033 struct net_device *slave_dev = slave->dev;
3034 struct bond_vlan_tag *outer_tag = tags;
3035
3036 if (!tags || tags->vlan_proto == BOND_VLAN_PROTO_NONE)
3037 return true;
3038
3039 tags++;
3040
3041 /* Go through all the tags backwards and add them to the packet */
3042 while (tags->vlan_proto != BOND_VLAN_PROTO_NONE) {
3043 if (!tags->vlan_id) {
3044 tags++;
3045 continue;
3046 }
3047
3048 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
3049 ntohs(outer_tag->vlan_proto), tags->vlan_id);
3050 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
3051 tags->vlan_id);
3052 if (!skb) {
3053 net_err_ratelimited("failed to insert inner VLAN tag\n");
3054 return false;
3055 }
3056
3057 tags++;
3058 }
3059 /* Set the outer tag */
3060 if (outer_tag->vlan_id) {
3061 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
3062 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
3063 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
3064 outer_tag->vlan_id);
3065 }
3066
3067 return true;
3068}
3069
3070/* We go to the (large) trouble of VLAN tagging ARP frames because
3071 * switches in VLAN mode (especially if ports are configured as
3072 * "native" to a VLAN) might not pass non-tagged frames.
3073 */
3074static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
3075 __be32 src_ip, struct bond_vlan_tag *tags)
3076{
3077 struct net_device *bond_dev = slave->bond->dev;
3078 struct net_device *slave_dev = slave->dev;
3079 struct sk_buff *skb;
3080
3081 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
3082 arp_op, &dest_ip, &src_ip);
3083
3084 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
3085 NULL, slave_dev->dev_addr, NULL);
3086
3087 if (!skb) {
3088 net_err_ratelimited("ARP packet allocation failed\n");
3089 return;
3090 }
3091
3092 if (bond_handle_vlan(slave, tags, skb)) {
3093 slave_update_last_tx(slave);
3094 arp_xmit(skb);
3095 }
3096
3097 return;
3098}
3099
3100/* Validate the device path between the @start_dev and the @end_dev.
3101 * The path is valid if the @end_dev is reachable through device
3102 * stacking.
3103 * When the path is validated, collect any vlan information in the
3104 * path.
3105 */
3106struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
3107 struct net_device *end_dev,
3108 int level)
3109{
3110 struct bond_vlan_tag *tags;
3111 struct net_device *upper;
3112 struct list_head *iter;
3113
3114 if (start_dev == end_dev) {
3115 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
3116 if (!tags)
3117 return ERR_PTR(-ENOMEM);
3118 tags[level].vlan_proto = BOND_VLAN_PROTO_NONE;
3119 return tags;
3120 }
3121
3122 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
3123 tags = bond_verify_device_path(upper, end_dev, level + 1);
3124 if (IS_ERR_OR_NULL(tags)) {
3125 if (IS_ERR(tags))
3126 return tags;
3127 continue;
3128 }
3129 if (is_vlan_dev(upper)) {
3130 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
3131 tags[level].vlan_id = vlan_dev_vlan_id(upper);
3132 }
3133
3134 return tags;
3135 }
3136
3137 return NULL;
3138}
3139
3140static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
3141{
3142 struct rtable *rt;
3143 struct bond_vlan_tag *tags;
3144 __be32 *targets = bond->params.arp_targets, addr;
3145 int i;
3146
3147 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
3148 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
3149 __func__, &targets[i]);
3150 tags = NULL;
3151
3152 /* Find out through which dev should the packet go */
3153 rt = ip_route_output(dev_net(bond->dev), targets[i], 0, 0, 0,
3154 RT_SCOPE_LINK);
3155 if (IS_ERR(rt)) {
3156 /* there's no route to target - try to send arp
3157 * probe to generate any traffic (arp_validate=0)
3158 */
3159 if (bond->params.arp_validate)
3160 pr_warn_once("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
3161 bond->dev->name,
3162 &targets[i]);
3163 bond_arp_send(slave, ARPOP_REQUEST, targets[i],
3164 0, tags);
3165 continue;
3166 }
3167
3168 /* bond device itself */
3169 if (rt->dst.dev == bond->dev)
3170 goto found;
3171
3172 rcu_read_lock();
3173 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
3174 rcu_read_unlock();
3175
3176 if (!IS_ERR_OR_NULL(tags))
3177 goto found;
3178
3179 /* Not our device - skip */
3180 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
3181 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
3182
3183 ip_rt_put(rt);
3184 continue;
3185
3186found:
3187 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
3188 ip_rt_put(rt);
3189 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
3190 kfree(tags);
3191 }
3192}
3193
3194static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
3195{
3196 int i;
3197
3198 if (!sip || !bond_has_this_ip(bond, tip)) {
3199 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
3200 __func__, &sip, &tip);
3201 return;
3202 }
3203
3204 i = bond_get_targets_ip(bond->params.arp_targets, sip);
3205 if (i == -1) {
3206 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
3207 __func__, &sip);
3208 return;
3209 }
3210 slave->last_rx = jiffies;
3211 slave->target_last_arp_rx[i] = jiffies;
3212}
3213
3214static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
3215 struct slave *slave)
3216{
3217 struct arphdr *arp = (struct arphdr *)skb->data;
3218 struct slave *curr_active_slave, *curr_arp_slave;
3219 unsigned char *arp_ptr;
3220 __be32 sip, tip;
3221 unsigned int alen;
3222
3223 alen = arp_hdr_len(bond->dev);
3224
3225 if (alen > skb_headlen(skb)) {
3226 arp = kmalloc(alen, GFP_ATOMIC);
3227 if (!arp)
3228 goto out_unlock;
3229 if (skb_copy_bits(skb, 0, arp, alen) < 0)
3230 goto out_unlock;
3231 }
3232
3233 if (arp->ar_hln != bond->dev->addr_len ||
3234 skb->pkt_type == PACKET_OTHERHOST ||
3235 skb->pkt_type == PACKET_LOOPBACK ||
3236 arp->ar_hrd != htons(ARPHRD_ETHER) ||
3237 arp->ar_pro != htons(ETH_P_IP) ||
3238 arp->ar_pln != 4)
3239 goto out_unlock;
3240
3241 arp_ptr = (unsigned char *)(arp + 1);
3242 arp_ptr += bond->dev->addr_len;
3243 memcpy(&sip, arp_ptr, 4);
3244 arp_ptr += 4 + bond->dev->addr_len;
3245 memcpy(&tip, arp_ptr, 4);
3246
3247 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
3248 __func__, slave->dev->name, bond_slave_state(slave),
3249 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3250 &sip, &tip);
3251
3252 curr_active_slave = rcu_dereference(bond->curr_active_slave);
3253 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3254
3255 /* We 'trust' the received ARP enough to validate it if:
3256 *
3257 * (a) the slave receiving the ARP is active (which includes the
3258 * current ARP slave, if any), or
3259 *
3260 * (b) the receiving slave isn't active, but there is a currently
3261 * active slave and it received valid arp reply(s) after it became
3262 * the currently active slave, or
3263 *
3264 * (c) there is an ARP slave that sent an ARP during the prior ARP
3265 * interval, and we receive an ARP reply on any slave. We accept
3266 * these because switch FDB update delays may deliver the ARP
3267 * reply to a slave other than the sender of the ARP request.
3268 *
3269 * Note: for (b), backup slaves are receiving the broadcast ARP
3270 * request, not a reply. This request passes from the sending
3271 * slave through the L2 switch(es) to the receiving slave. Since
3272 * this is checking the request, sip/tip are swapped for
3273 * validation.
3274 *
3275 * This is done to avoid endless looping when we can't reach the
3276 * arp_ip_target and fool ourselves with our own arp requests.
3277 */
3278 if (bond_is_active_slave(slave))
3279 bond_validate_arp(bond, slave, sip, tip);
3280 else if (curr_active_slave &&
3281 time_after(slave_last_rx(bond, curr_active_slave),
3282 curr_active_slave->last_link_up))
3283 bond_validate_arp(bond, slave, tip, sip);
3284 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
3285 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3286 bond_validate_arp(bond, slave, sip, tip);
3287
3288out_unlock:
3289 if (arp != (struct arphdr *)skb->data)
3290 kfree(arp);
3291 return RX_HANDLER_ANOTHER;
3292}
3293
3294#if IS_ENABLED(CONFIG_IPV6)
3295static void bond_ns_send(struct slave *slave, const struct in6_addr *daddr,
3296 const struct in6_addr *saddr, struct bond_vlan_tag *tags)
3297{
3298 struct net_device *bond_dev = slave->bond->dev;
3299 struct net_device *slave_dev = slave->dev;
3300 struct in6_addr mcaddr;
3301 struct sk_buff *skb;
3302
3303 slave_dbg(bond_dev, slave_dev, "NS on slave: dst %pI6c src %pI6c\n",
3304 daddr, saddr);
3305
3306 skb = ndisc_ns_create(slave_dev, daddr, saddr, 0);
3307 if (!skb) {
3308 net_err_ratelimited("NS packet allocation failed\n");
3309 return;
3310 }
3311
3312 addrconf_addr_solict_mult(daddr, &mcaddr);
3313 if (bond_handle_vlan(slave, tags, skb)) {
3314 slave_update_last_tx(slave);
3315 ndisc_send_skb(skb, &mcaddr, saddr);
3316 }
3317}
3318
3319static void bond_ns_send_all(struct bonding *bond, struct slave *slave)
3320{
3321 struct in6_addr *targets = bond->params.ns_targets;
3322 struct bond_vlan_tag *tags;
3323 struct dst_entry *dst;
3324 struct in6_addr saddr;
3325 struct flowi6 fl6;
3326 int i;
3327
3328 for (i = 0; i < BOND_MAX_NS_TARGETS && !ipv6_addr_any(&targets[i]); i++) {
3329 slave_dbg(bond->dev, slave->dev, "%s: target %pI6c\n",
3330 __func__, &targets[i]);
3331 tags = NULL;
3332
3333 /* Find out through which dev should the packet go */
3334 memset(&fl6, 0, sizeof(struct flowi6));
3335 fl6.daddr = targets[i];
3336 fl6.flowi6_oif = bond->dev->ifindex;
3337
3338 dst = ip6_route_output(dev_net(bond->dev), NULL, &fl6);
3339 if (dst->error) {
3340 dst_release(dst);
3341 /* there's no route to target - try to send arp
3342 * probe to generate any traffic (arp_validate=0)
3343 */
3344 if (bond->params.arp_validate)
3345 pr_warn_once("%s: no route to ns_ip6_target %pI6c and arp_validate is set\n",
3346 bond->dev->name,
3347 &targets[i]);
3348 bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3349 continue;
3350 }
3351
3352 /* bond device itself */
3353 if (dst->dev == bond->dev)
3354 goto found;
3355
3356 rcu_read_lock();
3357 tags = bond_verify_device_path(bond->dev, dst->dev, 0);
3358 rcu_read_unlock();
3359
3360 if (!IS_ERR_OR_NULL(tags))
3361 goto found;
3362
3363 /* Not our device - skip */
3364 slave_dbg(bond->dev, slave->dev, "no path to ns_ip6_target %pI6c via dst->dev %s\n",
3365 &targets[i], dst->dev ? dst->dev->name : "NULL");
3366
3367 dst_release(dst);
3368 continue;
3369
3370found:
3371 if (!ipv6_dev_get_saddr(dev_net(dst->dev), dst->dev, &targets[i], 0, &saddr))
3372 bond_ns_send(slave, &targets[i], &saddr, tags);
3373 else
3374 bond_ns_send(slave, &targets[i], &in6addr_any, tags);
3375
3376 dst_release(dst);
3377 kfree(tags);
3378 }
3379}
3380
3381static int bond_confirm_addr6(struct net_device *dev,
3382 struct netdev_nested_priv *priv)
3383{
3384 struct in6_addr *addr = (struct in6_addr *)priv->data;
3385
3386 return ipv6_chk_addr(dev_net(dev), addr, dev, 0);
3387}
3388
3389static bool bond_has_this_ip6(struct bonding *bond, struct in6_addr *addr)
3390{
3391 struct netdev_nested_priv priv = {
3392 .data = addr,
3393 };
3394 int ret = false;
3395
3396 if (bond_confirm_addr6(bond->dev, &priv))
3397 return true;
3398
3399 rcu_read_lock();
3400 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_confirm_addr6, &priv))
3401 ret = true;
3402 rcu_read_unlock();
3403
3404 return ret;
3405}
3406
3407static void bond_validate_na(struct bonding *bond, struct slave *slave,
3408 struct in6_addr *saddr, struct in6_addr *daddr)
3409{
3410 int i;
3411
3412 /* Ignore NAs that:
3413 * 1. Source address is unspecified address.
3414 * 2. Dest address is neither all-nodes multicast address nor
3415 * exist on bond interface.
3416 */
3417 if (ipv6_addr_any(saddr) ||
3418 (!ipv6_addr_equal(daddr, &in6addr_linklocal_allnodes) &&
3419 !bond_has_this_ip6(bond, daddr))) {
3420 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c tip %pI6c not found\n",
3421 __func__, saddr, daddr);
3422 return;
3423 }
3424
3425 i = bond_get_targets_ip6(bond->params.ns_targets, saddr);
3426 if (i == -1) {
3427 slave_dbg(bond->dev, slave->dev, "%s: sip %pI6c not found in targets\n",
3428 __func__, saddr);
3429 return;
3430 }
3431 slave->last_rx = jiffies;
3432 slave->target_last_arp_rx[i] = jiffies;
3433}
3434
3435static int bond_na_rcv(const struct sk_buff *skb, struct bonding *bond,
3436 struct slave *slave)
3437{
3438 struct slave *curr_active_slave, *curr_arp_slave;
3439 struct in6_addr *saddr, *daddr;
3440 struct {
3441 struct ipv6hdr ip6;
3442 struct icmp6hdr icmp6;
3443 } *combined, _combined;
3444
3445 if (skb->pkt_type == PACKET_OTHERHOST ||
3446 skb->pkt_type == PACKET_LOOPBACK)
3447 goto out;
3448
3449 combined = skb_header_pointer(skb, 0, sizeof(_combined), &_combined);
3450 if (!combined || combined->ip6.nexthdr != NEXTHDR_ICMP ||
3451 (combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION &&
3452 combined->icmp6.icmp6_type != NDISC_NEIGHBOUR_ADVERTISEMENT))
3453 goto out;
3454
3455 saddr = &combined->ip6.saddr;
3456 daddr = &combined->ip6.daddr;
3457
3458 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI6c tip %pI6c\n",
3459 __func__, slave->dev->name, bond_slave_state(slave),
3460 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
3461 saddr, daddr);
3462
3463 curr_active_slave = rcu_dereference(bond->curr_active_slave);
3464 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
3465
3466 /* We 'trust' the received ARP enough to validate it if:
3467 * see bond_arp_rcv().
3468 */
3469 if (bond_is_active_slave(slave))
3470 bond_validate_na(bond, slave, saddr, daddr);
3471 else if (curr_active_slave &&
3472 time_after(slave_last_rx(bond, curr_active_slave),
3473 curr_active_slave->last_link_up))
3474 bond_validate_na(bond, slave, daddr, saddr);
3475 else if (curr_arp_slave &&
3476 bond_time_in_interval(bond, slave_last_tx(curr_arp_slave), 1))
3477 bond_validate_na(bond, slave, saddr, daddr);
3478
3479out:
3480 return RX_HANDLER_ANOTHER;
3481}
3482#endif
3483
3484int bond_rcv_validate(const struct sk_buff *skb, struct bonding *bond,
3485 struct slave *slave)
3486{
3487#if IS_ENABLED(CONFIG_IPV6)
3488 bool is_ipv6 = skb->protocol == __cpu_to_be16(ETH_P_IPV6);
3489#endif
3490 bool is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
3491
3492 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
3493 __func__, skb->dev->name);
3494
3495 /* Use arp validate logic for both ARP and NS */
3496 if (!slave_do_arp_validate(bond, slave)) {
3497 if ((slave_do_arp_validate_only(bond) && is_arp) ||
3498#if IS_ENABLED(CONFIG_IPV6)
3499 (slave_do_arp_validate_only(bond) && is_ipv6) ||
3500#endif
3501 !slave_do_arp_validate_only(bond))
3502 slave->last_rx = jiffies;
3503 return RX_HANDLER_ANOTHER;
3504 } else if (is_arp) {
3505 return bond_arp_rcv(skb, bond, slave);
3506#if IS_ENABLED(CONFIG_IPV6)
3507 } else if (is_ipv6) {
3508 return bond_na_rcv(skb, bond, slave);
3509#endif
3510 } else {
3511 return RX_HANDLER_ANOTHER;
3512 }
3513}
3514
3515static void bond_send_validate(struct bonding *bond, struct slave *slave)
3516{
3517 bond_arp_send_all(bond, slave);
3518#if IS_ENABLED(CONFIG_IPV6)
3519 bond_ns_send_all(bond, slave);
3520#endif
3521}
3522
3523/* function to verify if we're in the arp_interval timeslice, returns true if
3524 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
3525 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
3526 */
3527static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
3528 int mod)
3529{
3530 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3531
3532 return time_in_range(jiffies,
3533 last_act - delta_in_ticks,
3534 last_act + mod * delta_in_ticks + delta_in_ticks/2);
3535}
3536
3537/* This function is called regularly to monitor each slave's link
3538 * ensuring that traffic is being sent and received when arp monitoring
3539 * is used in load-balancing mode. if the adapter has been dormant, then an
3540 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
3541 * arp monitoring in active backup mode.
3542 */
3543static void bond_loadbalance_arp_mon(struct bonding *bond)
3544{
3545 struct slave *slave, *oldcurrent;
3546 struct list_head *iter;
3547 int do_failover = 0, slave_state_changed = 0;
3548
3549 if (!bond_has_slaves(bond))
3550 goto re_arm;
3551
3552 rcu_read_lock();
3553
3554 oldcurrent = rcu_dereference(bond->curr_active_slave);
3555 /* see if any of the previous devices are up now (i.e. they have
3556 * xmt and rcv traffic). the curr_active_slave does not come into
3557 * the picture unless it is null. also, slave->last_link_up is not
3558 * needed here because we send an arp on each slave and give a slave
3559 * as long as it needs to get the tx/rx within the delta.
3560 * TODO: what about up/down delay in arp mode? it wasn't here before
3561 * so it can wait
3562 */
3563 bond_for_each_slave_rcu(bond, slave, iter) {
3564 unsigned long last_tx = slave_last_tx(slave);
3565
3566 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3567
3568 if (slave->link != BOND_LINK_UP) {
3569 if (bond_time_in_interval(bond, last_tx, 1) &&
3570 bond_time_in_interval(bond, slave->last_rx, 1)) {
3571
3572 bond_propose_link_state(slave, BOND_LINK_UP);
3573 slave_state_changed = 1;
3574
3575 /* primary_slave has no meaning in round-robin
3576 * mode. the window of a slave being up and
3577 * curr_active_slave being null after enslaving
3578 * is closed.
3579 */
3580 if (!oldcurrent) {
3581 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3582 do_failover = 1;
3583 } else {
3584 slave_info(bond->dev, slave->dev, "interface is now up\n");
3585 }
3586 }
3587 } else {
3588 /* slave->link == BOND_LINK_UP */
3589
3590 /* not all switches will respond to an arp request
3591 * when the source ip is 0, so don't take the link down
3592 * if we don't know our ip yet
3593 */
3594 if (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3595 !bond_time_in_interval(bond, slave->last_rx, bond->params.missed_max)) {
3596
3597 bond_propose_link_state(slave, BOND_LINK_DOWN);
3598 slave_state_changed = 1;
3599
3600 if (slave->link_failure_count < UINT_MAX)
3601 slave->link_failure_count++;
3602
3603 slave_info(bond->dev, slave->dev, "interface is now down\n");
3604
3605 if (slave == oldcurrent)
3606 do_failover = 1;
3607 }
3608 }
3609
3610 /* note: if switch is in round-robin mode, all links
3611 * must tx arp to ensure all links rx an arp - otherwise
3612 * links may oscillate or not come up at all; if switch is
3613 * in something like xor mode, there is nothing we can
3614 * do - all replies will be rx'ed on same link causing slaves
3615 * to be unstable during low/no traffic periods
3616 */
3617 if (bond_slave_is_up(slave))
3618 bond_send_validate(bond, slave);
3619 }
3620
3621 rcu_read_unlock();
3622
3623 if (do_failover || slave_state_changed) {
3624 if (!rtnl_trylock())
3625 goto re_arm;
3626
3627 bond_for_each_slave(bond, slave, iter) {
3628 if (slave->link_new_state != BOND_LINK_NOCHANGE)
3629 slave->link = slave->link_new_state;
3630 }
3631
3632 if (slave_state_changed) {
3633 bond_slave_state_change(bond);
3634 if (BOND_MODE(bond) == BOND_MODE_XOR)
3635 bond_update_slave_arr(bond, NULL);
3636 }
3637 if (do_failover) {
3638 block_netpoll_tx();
3639 bond_select_active_slave(bond);
3640 unblock_netpoll_tx();
3641 }
3642 rtnl_unlock();
3643 }
3644
3645re_arm:
3646 if (bond->params.arp_interval)
3647 queue_delayed_work(bond->wq, &bond->arp_work,
3648 msecs_to_jiffies(bond->params.arp_interval));
3649}
3650
3651/* Called to inspect slaves for active-backup mode ARP monitor link state
3652 * changes. Sets proposed link state in slaves to specify what action
3653 * should take place for the slave. Returns 0 if no changes are found, >0
3654 * if changes to link states must be committed.
3655 *
3656 * Called with rcu_read_lock held.
3657 */
3658static int bond_ab_arp_inspect(struct bonding *bond)
3659{
3660 unsigned long last_tx, last_rx;
3661 struct list_head *iter;
3662 struct slave *slave;
3663 int commit = 0;
3664
3665 bond_for_each_slave_rcu(bond, slave, iter) {
3666 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
3667 last_rx = slave_last_rx(bond, slave);
3668
3669 if (slave->link != BOND_LINK_UP) {
3670 if (bond_time_in_interval(bond, last_rx, 1)) {
3671 bond_propose_link_state(slave, BOND_LINK_UP);
3672 commit++;
3673 } else if (slave->link == BOND_LINK_BACK) {
3674 bond_propose_link_state(slave, BOND_LINK_FAIL);
3675 commit++;
3676 }
3677 continue;
3678 }
3679
3680 /* Give slaves 2*delta after being enslaved or made
3681 * active. This avoids bouncing, as the last receive
3682 * times need a full ARP monitor cycle to be updated.
3683 */
3684 if (bond_time_in_interval(bond, slave->last_link_up, 2))
3685 continue;
3686
3687 /* Backup slave is down if:
3688 * - No current_arp_slave AND
3689 * - more than (missed_max+1)*delta since last receive AND
3690 * - the bond has an IP address
3691 *
3692 * Note: a non-null current_arp_slave indicates
3693 * the curr_active_slave went down and we are
3694 * searching for a new one; under this condition
3695 * we only take the curr_active_slave down - this
3696 * gives each slave a chance to tx/rx traffic
3697 * before being taken out
3698 */
3699 if (!bond_is_active_slave(slave) &&
3700 !rcu_access_pointer(bond->current_arp_slave) &&
3701 !bond_time_in_interval(bond, last_rx, bond->params.missed_max + 1)) {
3702 bond_propose_link_state(slave, BOND_LINK_DOWN);
3703 commit++;
3704 }
3705
3706 /* Active slave is down if:
3707 * - more than missed_max*delta since transmitting OR
3708 * - (more than missed_max*delta since receive AND
3709 * the bond has an IP address)
3710 */
3711 last_tx = slave_last_tx(slave);
3712 if (bond_is_active_slave(slave) &&
3713 (!bond_time_in_interval(bond, last_tx, bond->params.missed_max) ||
3714 !bond_time_in_interval(bond, last_rx, bond->params.missed_max))) {
3715 bond_propose_link_state(slave, BOND_LINK_DOWN);
3716 commit++;
3717 }
3718 }
3719
3720 return commit;
3721}
3722
3723/* Called to commit link state changes noted by inspection step of
3724 * active-backup mode ARP monitor.
3725 *
3726 * Called with RTNL hold.
3727 */
3728static void bond_ab_arp_commit(struct bonding *bond)
3729{
3730 bool do_failover = false;
3731 struct list_head *iter;
3732 unsigned long last_tx;
3733 struct slave *slave;
3734
3735 bond_for_each_slave(bond, slave, iter) {
3736 switch (slave->link_new_state) {
3737 case BOND_LINK_NOCHANGE:
3738 continue;
3739
3740 case BOND_LINK_UP:
3741 last_tx = slave_last_tx(slave);
3742 if (rtnl_dereference(bond->curr_active_slave) != slave ||
3743 (!rtnl_dereference(bond->curr_active_slave) &&
3744 bond_time_in_interval(bond, last_tx, 1))) {
3745 struct slave *current_arp_slave;
3746
3747 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3748 bond_set_slave_link_state(slave, BOND_LINK_UP,
3749 BOND_SLAVE_NOTIFY_NOW);
3750 if (current_arp_slave) {
3751 bond_set_slave_inactive_flags(
3752 current_arp_slave,
3753 BOND_SLAVE_NOTIFY_NOW);
3754 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3755 }
3756
3757 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3758
3759 if (!rtnl_dereference(bond->curr_active_slave) ||
3760 slave == rtnl_dereference(bond->primary_slave) ||
3761 slave->prio > rtnl_dereference(bond->curr_active_slave)->prio)
3762 do_failover = true;
3763
3764 }
3765
3766 continue;
3767
3768 case BOND_LINK_DOWN:
3769 if (slave->link_failure_count < UINT_MAX)
3770 slave->link_failure_count++;
3771
3772 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3773 BOND_SLAVE_NOTIFY_NOW);
3774 bond_set_slave_inactive_flags(slave,
3775 BOND_SLAVE_NOTIFY_NOW);
3776
3777 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3778
3779 if (slave == rtnl_dereference(bond->curr_active_slave)) {
3780 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3781 do_failover = true;
3782 }
3783
3784 continue;
3785
3786 case BOND_LINK_FAIL:
3787 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3788 BOND_SLAVE_NOTIFY_NOW);
3789 bond_set_slave_inactive_flags(slave,
3790 BOND_SLAVE_NOTIFY_NOW);
3791
3792 /* A slave has just been enslaved and has become
3793 * the current active slave.
3794 */
3795 if (rtnl_dereference(bond->curr_active_slave))
3796 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3797 continue;
3798
3799 default:
3800 slave_err(bond->dev, slave->dev,
3801 "impossible: link_new_state %d on slave\n",
3802 slave->link_new_state);
3803 continue;
3804 }
3805 }
3806
3807 if (do_failover) {
3808 block_netpoll_tx();
3809 bond_select_active_slave(bond);
3810 unblock_netpoll_tx();
3811 }
3812
3813 bond_set_carrier(bond);
3814}
3815
3816/* Send ARP probes for active-backup mode ARP monitor.
3817 *
3818 * Called with rcu_read_lock held.
3819 */
3820static bool bond_ab_arp_probe(struct bonding *bond)
3821{
3822 struct slave *slave, *before = NULL, *new_slave = NULL,
3823 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3824 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3825 struct list_head *iter;
3826 bool found = false;
3827 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3828
3829 if (curr_arp_slave && curr_active_slave)
3830 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3831 curr_arp_slave->dev->name,
3832 curr_active_slave->dev->name);
3833
3834 if (curr_active_slave) {
3835 bond_send_validate(bond, curr_active_slave);
3836 return should_notify_rtnl;
3837 }
3838
3839 /* if we don't have a curr_active_slave, search for the next available
3840 * backup slave from the current_arp_slave and make it the candidate
3841 * for becoming the curr_active_slave
3842 */
3843
3844 if (!curr_arp_slave) {
3845 curr_arp_slave = bond_first_slave_rcu(bond);
3846 if (!curr_arp_slave)
3847 return should_notify_rtnl;
3848 }
3849
3850 bond_for_each_slave_rcu(bond, slave, iter) {
3851 if (!found && !before && bond_slave_is_up(slave))
3852 before = slave;
3853
3854 if (found && !new_slave && bond_slave_is_up(slave))
3855 new_slave = slave;
3856 /* if the link state is up at this point, we
3857 * mark it down - this can happen if we have
3858 * simultaneous link failures and
3859 * reselect_active_interface doesn't make this
3860 * one the current slave so it is still marked
3861 * up when it is actually down
3862 */
3863 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3864 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3865 BOND_SLAVE_NOTIFY_LATER);
3866 if (slave->link_failure_count < UINT_MAX)
3867 slave->link_failure_count++;
3868
3869 bond_set_slave_inactive_flags(slave,
3870 BOND_SLAVE_NOTIFY_LATER);
3871
3872 slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3873 }
3874 if (slave == curr_arp_slave)
3875 found = true;
3876 }
3877
3878 if (!new_slave && before)
3879 new_slave = before;
3880
3881 if (!new_slave)
3882 goto check_state;
3883
3884 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3885 BOND_SLAVE_NOTIFY_LATER);
3886 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3887 bond_send_validate(bond, new_slave);
3888 new_slave->last_link_up = jiffies;
3889 rcu_assign_pointer(bond->current_arp_slave, new_slave);
3890
3891check_state:
3892 bond_for_each_slave_rcu(bond, slave, iter) {
3893 if (slave->should_notify || slave->should_notify_link) {
3894 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3895 break;
3896 }
3897 }
3898 return should_notify_rtnl;
3899}
3900
3901static void bond_activebackup_arp_mon(struct bonding *bond)
3902{
3903 bool should_notify_peers = false;
3904 bool should_notify_rtnl = false;
3905 int delta_in_ticks;
3906
3907 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3908
3909 if (!bond_has_slaves(bond))
3910 goto re_arm;
3911
3912 rcu_read_lock();
3913
3914 should_notify_peers = bond_should_notify_peers(bond);
3915
3916 if (bond_ab_arp_inspect(bond)) {
3917 rcu_read_unlock();
3918
3919 /* Race avoidance with bond_close flush of workqueue */
3920 if (!rtnl_trylock()) {
3921 delta_in_ticks = 1;
3922 should_notify_peers = false;
3923 goto re_arm;
3924 }
3925
3926 bond_ab_arp_commit(bond);
3927
3928 rtnl_unlock();
3929 rcu_read_lock();
3930 }
3931
3932 should_notify_rtnl = bond_ab_arp_probe(bond);
3933 rcu_read_unlock();
3934
3935re_arm:
3936 if (bond->params.arp_interval)
3937 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3938
3939 if (should_notify_peers || should_notify_rtnl) {
3940 if (!rtnl_trylock())
3941 return;
3942
3943 if (should_notify_peers) {
3944 bond->send_peer_notif--;
3945 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3946 bond->dev);
3947 }
3948 if (should_notify_rtnl) {
3949 bond_slave_state_notify(bond);
3950 bond_slave_link_notify(bond);
3951 }
3952
3953 rtnl_unlock();
3954 }
3955}
3956
3957static void bond_arp_monitor(struct work_struct *work)
3958{
3959 struct bonding *bond = container_of(work, struct bonding,
3960 arp_work.work);
3961
3962 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3963 bond_activebackup_arp_mon(bond);
3964 else
3965 bond_loadbalance_arp_mon(bond);
3966}
3967
3968/*-------------------------- netdev event handling --------------------------*/
3969
3970/* Change device name */
3971static int bond_event_changename(struct bonding *bond)
3972{
3973 bond_remove_proc_entry(bond);
3974 bond_create_proc_entry(bond);
3975
3976 bond_debug_reregister(bond);
3977
3978 return NOTIFY_DONE;
3979}
3980
3981static int bond_master_netdev_event(unsigned long event,
3982 struct net_device *bond_dev)
3983{
3984 struct bonding *event_bond = netdev_priv(bond_dev);
3985
3986 netdev_dbg(bond_dev, "%s called\n", __func__);
3987
3988 switch (event) {
3989 case NETDEV_CHANGENAME:
3990 return bond_event_changename(event_bond);
3991 case NETDEV_UNREGISTER:
3992 bond_remove_proc_entry(event_bond);
3993#ifdef CONFIG_XFRM_OFFLOAD
3994 xfrm_dev_state_flush(dev_net(bond_dev), bond_dev, true);
3995#endif /* CONFIG_XFRM_OFFLOAD */
3996 break;
3997 case NETDEV_REGISTER:
3998 bond_create_proc_entry(event_bond);
3999 break;
4000 default:
4001 break;
4002 }
4003
4004 return NOTIFY_DONE;
4005}
4006
4007static int bond_slave_netdev_event(unsigned long event,
4008 struct net_device *slave_dev)
4009{
4010 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
4011 struct bonding *bond;
4012 struct net_device *bond_dev;
4013
4014 /* A netdev event can be generated while enslaving a device
4015 * before netdev_rx_handler_register is called in which case
4016 * slave will be NULL
4017 */
4018 if (!slave) {
4019 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
4020 return NOTIFY_DONE;
4021 }
4022
4023 bond_dev = slave->bond->dev;
4024 bond = slave->bond;
4025 primary = rtnl_dereference(bond->primary_slave);
4026
4027 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
4028
4029 switch (event) {
4030 case NETDEV_UNREGISTER:
4031 if (bond_dev->type != ARPHRD_ETHER)
4032 bond_release_and_destroy(bond_dev, slave_dev);
4033 else
4034 __bond_release_one(bond_dev, slave_dev, false, true);
4035 break;
4036 case NETDEV_UP:
4037 case NETDEV_CHANGE:
4038 /* For 802.3ad mode only:
4039 * Getting invalid Speed/Duplex values here will put slave
4040 * in weird state. Mark it as link-fail if the link was
4041 * previously up or link-down if it hasn't yet come up, and
4042 * let link-monitoring (miimon) set it right when correct
4043 * speeds/duplex are available.
4044 */
4045 if (bond_update_speed_duplex(slave) &&
4046 BOND_MODE(bond) == BOND_MODE_8023AD) {
4047 if (slave->last_link_up)
4048 slave->link = BOND_LINK_FAIL;
4049 else
4050 slave->link = BOND_LINK_DOWN;
4051 }
4052
4053 if (BOND_MODE(bond) == BOND_MODE_8023AD)
4054 bond_3ad_adapter_speed_duplex_changed(slave);
4055 fallthrough;
4056 case NETDEV_DOWN:
4057 /* Refresh slave-array if applicable!
4058 * If the setup does not use miimon or arpmon (mode-specific!),
4059 * then these events will not cause the slave-array to be
4060 * refreshed. This will cause xmit to use a slave that is not
4061 * usable. Avoid such situation by refeshing the array at these
4062 * events. If these (miimon/arpmon) parameters are configured
4063 * then array gets refreshed twice and that should be fine!
4064 */
4065 if (bond_mode_can_use_xmit_hash(bond))
4066 bond_update_slave_arr(bond, NULL);
4067 break;
4068 case NETDEV_CHANGEMTU:
4069 /* TODO: Should slaves be allowed to
4070 * independently alter their MTU? For
4071 * an active-backup bond, slaves need
4072 * not be the same type of device, so
4073 * MTUs may vary. For other modes,
4074 * slaves arguably should have the
4075 * same MTUs. To do this, we'd need to
4076 * take over the slave's change_mtu
4077 * function for the duration of their
4078 * servitude.
4079 */
4080 break;
4081 case NETDEV_CHANGENAME:
4082 /* we don't care if we don't have primary set */
4083 if (!bond_uses_primary(bond) ||
4084 !bond->params.primary[0])
4085 break;
4086
4087 if (slave == primary) {
4088 /* slave's name changed - he's no longer primary */
4089 RCU_INIT_POINTER(bond->primary_slave, NULL);
4090 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
4091 /* we have a new primary slave */
4092 rcu_assign_pointer(bond->primary_slave, slave);
4093 } else { /* we didn't change primary - exit */
4094 break;
4095 }
4096
4097 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
4098 primary ? slave_dev->name : "none");
4099
4100 block_netpoll_tx();
4101 bond_select_active_slave(bond);
4102 unblock_netpoll_tx();
4103 break;
4104 case NETDEV_FEAT_CHANGE:
4105 if (!bond->notifier_ctx) {
4106 bond->notifier_ctx = true;
4107 bond_compute_features(bond);
4108 bond->notifier_ctx = false;
4109 }
4110 break;
4111 case NETDEV_RESEND_IGMP:
4112 /* Propagate to master device */
4113 call_netdevice_notifiers(event, slave->bond->dev);
4114 break;
4115 case NETDEV_XDP_FEAT_CHANGE:
4116 bond_xdp_set_features(bond_dev);
4117 break;
4118 default:
4119 break;
4120 }
4121
4122 return NOTIFY_DONE;
4123}
4124
4125/* bond_netdev_event: handle netdev notifier chain events.
4126 *
4127 * This function receives events for the netdev chain. The caller (an
4128 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
4129 * locks for us to safely manipulate the slave devices (RTNL lock,
4130 * dev_probe_lock).
4131 */
4132static int bond_netdev_event(struct notifier_block *this,
4133 unsigned long event, void *ptr)
4134{
4135 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
4136
4137 netdev_dbg(event_dev, "%s received %s\n",
4138 __func__, netdev_cmd_to_name(event));
4139
4140 if (!(event_dev->priv_flags & IFF_BONDING))
4141 return NOTIFY_DONE;
4142
4143 if (event_dev->flags & IFF_MASTER) {
4144 int ret;
4145
4146 ret = bond_master_netdev_event(event, event_dev);
4147 if (ret != NOTIFY_DONE)
4148 return ret;
4149 }
4150
4151 if (event_dev->flags & IFF_SLAVE)
4152 return bond_slave_netdev_event(event, event_dev);
4153
4154 return NOTIFY_DONE;
4155}
4156
4157static struct notifier_block bond_netdev_notifier = {
4158 .notifier_call = bond_netdev_event,
4159};
4160
4161/*---------------------------- Hashing Policies -----------------------------*/
4162
4163/* Helper to access data in a packet, with or without a backing skb.
4164 * If skb is given the data is linearized if necessary via pskb_may_pull.
4165 */
4166static inline const void *bond_pull_data(struct sk_buff *skb,
4167 const void *data, int hlen, int n)
4168{
4169 if (likely(n <= hlen))
4170 return data;
4171 else if (skb && likely(pskb_may_pull(skb, n)))
4172 return skb->data;
4173
4174 return NULL;
4175}
4176
4177/* L2 hash helper */
4178static inline u32 bond_eth_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4179{
4180 struct ethhdr *ep;
4181
4182 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4183 if (!data)
4184 return 0;
4185
4186 ep = (struct ethhdr *)(data + mhoff);
4187 return ep->h_dest[5] ^ ep->h_source[5] ^ be16_to_cpu(ep->h_proto);
4188}
4189
4190static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk, const void *data,
4191 int hlen, __be16 l2_proto, int *nhoff, int *ip_proto, bool l34)
4192{
4193 const struct ipv6hdr *iph6;
4194 const struct iphdr *iph;
4195
4196 if (l2_proto == htons(ETH_P_IP)) {
4197 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph));
4198 if (!data)
4199 return false;
4200
4201 iph = (const struct iphdr *)(data + *nhoff);
4202 iph_to_flow_copy_v4addrs(fk, iph);
4203 *nhoff += iph->ihl << 2;
4204 if (!ip_is_fragment(iph))
4205 *ip_proto = iph->protocol;
4206 } else if (l2_proto == htons(ETH_P_IPV6)) {
4207 data = bond_pull_data(skb, data, hlen, *nhoff + sizeof(*iph6));
4208 if (!data)
4209 return false;
4210
4211 iph6 = (const struct ipv6hdr *)(data + *nhoff);
4212 iph_to_flow_copy_v6addrs(fk, iph6);
4213 *nhoff += sizeof(*iph6);
4214 *ip_proto = iph6->nexthdr;
4215 } else {
4216 return false;
4217 }
4218
4219 if (l34 && *ip_proto >= 0)
4220 fk->ports.ports = __skb_flow_get_ports(skb, *nhoff, *ip_proto, data, hlen);
4221
4222 return true;
4223}
4224
4225static u32 bond_vlan_srcmac_hash(struct sk_buff *skb, const void *data, int mhoff, int hlen)
4226{
4227 u32 srcmac_vendor = 0, srcmac_dev = 0;
4228 struct ethhdr *mac_hdr;
4229 u16 vlan = 0;
4230 int i;
4231
4232 data = bond_pull_data(skb, data, hlen, mhoff + sizeof(struct ethhdr));
4233 if (!data)
4234 return 0;
4235 mac_hdr = (struct ethhdr *)(data + mhoff);
4236
4237 for (i = 0; i < 3; i++)
4238 srcmac_vendor = (srcmac_vendor << 8) | mac_hdr->h_source[i];
4239
4240 for (i = 3; i < ETH_ALEN; i++)
4241 srcmac_dev = (srcmac_dev << 8) | mac_hdr->h_source[i];
4242
4243 if (skb && skb_vlan_tag_present(skb))
4244 vlan = skb_vlan_tag_get(skb);
4245
4246 return vlan ^ srcmac_vendor ^ srcmac_dev;
4247}
4248
4249/* Extract the appropriate headers based on bond's xmit policy */
4250static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb, const void *data,
4251 __be16 l2_proto, int nhoff, int hlen, struct flow_keys *fk)
4252{
4253 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
4254 int ip_proto = -1;
4255
4256 switch (bond->params.xmit_policy) {
4257 case BOND_XMIT_POLICY_ENCAP23:
4258 case BOND_XMIT_POLICY_ENCAP34:
4259 memset(fk, 0, sizeof(*fk));
4260 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
4261 fk, data, l2_proto, nhoff, hlen, 0);
4262 default:
4263 break;
4264 }
4265
4266 fk->ports.ports = 0;
4267 memset(&fk->icmp, 0, sizeof(fk->icmp));
4268 if (!bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34))
4269 return false;
4270
4271 /* ICMP error packets contains at least 8 bytes of the header
4272 * of the packet which generated the error. Use this information
4273 * to correlate ICMP error packets within the same flow which
4274 * generated the error.
4275 */
4276 if (ip_proto == IPPROTO_ICMP || ip_proto == IPPROTO_ICMPV6) {
4277 skb_flow_get_icmp_tci(skb, &fk->icmp, data, nhoff, hlen);
4278 if (ip_proto == IPPROTO_ICMP) {
4279 if (!icmp_is_err(fk->icmp.type))
4280 return true;
4281
4282 nhoff += sizeof(struct icmphdr);
4283 } else if (ip_proto == IPPROTO_ICMPV6) {
4284 if (!icmpv6_is_err(fk->icmp.type))
4285 return true;
4286
4287 nhoff += sizeof(struct icmp6hdr);
4288 }
4289 return bond_flow_ip(skb, fk, data, hlen, l2_proto, &nhoff, &ip_proto, l34);
4290 }
4291
4292 return true;
4293}
4294
4295static u32 bond_ip_hash(u32 hash, struct flow_keys *flow, int xmit_policy)
4296{
4297 hash ^= (__force u32)flow_get_u32_dst(flow) ^
4298 (__force u32)flow_get_u32_src(flow);
4299 hash ^= (hash >> 16);
4300 hash ^= (hash >> 8);
4301
4302 /* discard lowest hash bit to deal with the common even ports pattern */
4303 if (xmit_policy == BOND_XMIT_POLICY_LAYER34 ||
4304 xmit_policy == BOND_XMIT_POLICY_ENCAP34)
4305 return hash >> 1;
4306
4307 return hash;
4308}
4309
4310/* Generate hash based on xmit policy. If @skb is given it is used to linearize
4311 * the data as required, but this function can be used without it if the data is
4312 * known to be linear (e.g. with xdp_buff).
4313 */
4314static u32 __bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, const void *data,
4315 __be16 l2_proto, int mhoff, int nhoff, int hlen)
4316{
4317 struct flow_keys flow;
4318 u32 hash;
4319
4320 if (bond->params.xmit_policy == BOND_XMIT_POLICY_VLAN_SRCMAC)
4321 return bond_vlan_srcmac_hash(skb, data, mhoff, hlen);
4322
4323 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
4324 !bond_flow_dissect(bond, skb, data, l2_proto, nhoff, hlen, &flow))
4325 return bond_eth_hash(skb, data, mhoff, hlen);
4326
4327 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
4328 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
4329 hash = bond_eth_hash(skb, data, mhoff, hlen);
4330 } else {
4331 if (flow.icmp.id)
4332 memcpy(&hash, &flow.icmp, sizeof(hash));
4333 else
4334 memcpy(&hash, &flow.ports.ports, sizeof(hash));
4335 }
4336
4337 return bond_ip_hash(hash, &flow, bond->params.xmit_policy);
4338}
4339
4340/**
4341 * bond_xmit_hash - generate a hash value based on the xmit policy
4342 * @bond: bonding device
4343 * @skb: buffer to use for headers
4344 *
4345 * This function will extract the necessary headers from the skb buffer and use
4346 * them to generate a hash based on the xmit_policy set in the bonding device
4347 */
4348u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
4349{
4350 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
4351 skb->l4_hash)
4352 return skb->hash;
4353
4354 return __bond_xmit_hash(bond, skb, skb->data, skb->protocol,
4355 0, skb_network_offset(skb),
4356 skb_headlen(skb));
4357}
4358
4359/**
4360 * bond_xmit_hash_xdp - generate a hash value based on the xmit policy
4361 * @bond: bonding device
4362 * @xdp: buffer to use for headers
4363 *
4364 * The XDP variant of bond_xmit_hash.
4365 */
4366static u32 bond_xmit_hash_xdp(struct bonding *bond, struct xdp_buff *xdp)
4367{
4368 struct ethhdr *eth;
4369
4370 if (xdp->data + sizeof(struct ethhdr) > xdp->data_end)
4371 return 0;
4372
4373 eth = (struct ethhdr *)xdp->data;
4374
4375 return __bond_xmit_hash(bond, NULL, xdp->data, eth->h_proto, 0,
4376 sizeof(struct ethhdr), xdp->data_end - xdp->data);
4377}
4378
4379/*-------------------------- Device entry points ----------------------------*/
4380
4381void bond_work_init_all(struct bonding *bond)
4382{
4383 INIT_DELAYED_WORK(&bond->mcast_work,
4384 bond_resend_igmp_join_requests_delayed);
4385 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
4386 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
4387 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
4388 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
4389 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
4390}
4391
4392static void bond_work_cancel_all(struct bonding *bond)
4393{
4394 cancel_delayed_work_sync(&bond->mii_work);
4395 cancel_delayed_work_sync(&bond->arp_work);
4396 cancel_delayed_work_sync(&bond->alb_work);
4397 cancel_delayed_work_sync(&bond->ad_work);
4398 cancel_delayed_work_sync(&bond->mcast_work);
4399 cancel_delayed_work_sync(&bond->slave_arr_work);
4400}
4401
4402static int bond_open(struct net_device *bond_dev)
4403{
4404 struct bonding *bond = netdev_priv(bond_dev);
4405 struct list_head *iter;
4406 struct slave *slave;
4407
4408 if (BOND_MODE(bond) == BOND_MODE_ROUNDROBIN && !bond->rr_tx_counter) {
4409 bond->rr_tx_counter = alloc_percpu(u32);
4410 if (!bond->rr_tx_counter)
4411 return -ENOMEM;
4412 }
4413
4414 /* reset slave->backup and slave->inactive */
4415 if (bond_has_slaves(bond)) {
4416 bond_for_each_slave(bond, slave, iter) {
4417 if (bond_uses_primary(bond) &&
4418 slave != rcu_access_pointer(bond->curr_active_slave)) {
4419 bond_set_slave_inactive_flags(slave,
4420 BOND_SLAVE_NOTIFY_NOW);
4421 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
4422 bond_set_slave_active_flags(slave,
4423 BOND_SLAVE_NOTIFY_NOW);
4424 }
4425 }
4426 }
4427
4428 if (bond_is_lb(bond)) {
4429 /* bond_alb_initialize must be called before the timer
4430 * is started.
4431 */
4432 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
4433 return -ENOMEM;
4434 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
4435 queue_delayed_work(bond->wq, &bond->alb_work, 0);
4436 }
4437
4438 if (bond->params.miimon) /* link check interval, in milliseconds. */
4439 queue_delayed_work(bond->wq, &bond->mii_work, 0);
4440
4441 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
4442 queue_delayed_work(bond->wq, &bond->arp_work, 0);
4443 bond->recv_probe = bond_rcv_validate;
4444 }
4445
4446 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4447 queue_delayed_work(bond->wq, &bond->ad_work, 0);
4448 /* register to receive LACPDUs */
4449 bond->recv_probe = bond_3ad_lacpdu_recv;
4450 bond_3ad_initiate_agg_selection(bond, 1);
4451
4452 bond_for_each_slave(bond, slave, iter)
4453 dev_mc_add(slave->dev, lacpdu_mcast_addr);
4454 }
4455
4456 if (bond_mode_can_use_xmit_hash(bond))
4457 bond_update_slave_arr(bond, NULL);
4458
4459 return 0;
4460}
4461
4462static int bond_close(struct net_device *bond_dev)
4463{
4464 struct bonding *bond = netdev_priv(bond_dev);
4465 struct slave *slave;
4466
4467 bond_work_cancel_all(bond);
4468 bond->send_peer_notif = 0;
4469 if (bond_is_lb(bond))
4470 bond_alb_deinitialize(bond);
4471 bond->recv_probe = NULL;
4472
4473 if (bond_uses_primary(bond)) {
4474 rcu_read_lock();
4475 slave = rcu_dereference(bond->curr_active_slave);
4476 if (slave)
4477 bond_hw_addr_flush(bond_dev, slave->dev);
4478 rcu_read_unlock();
4479 } else {
4480 struct list_head *iter;
4481
4482 bond_for_each_slave(bond, slave, iter)
4483 bond_hw_addr_flush(bond_dev, slave->dev);
4484 }
4485
4486 return 0;
4487}
4488
4489/* fold stats, assuming all rtnl_link_stats64 fields are u64, but
4490 * that some drivers can provide 32bit values only.
4491 */
4492static void bond_fold_stats(struct rtnl_link_stats64 *_res,
4493 const struct rtnl_link_stats64 *_new,
4494 const struct rtnl_link_stats64 *_old)
4495{
4496 const u64 *new = (const u64 *)_new;
4497 const u64 *old = (const u64 *)_old;
4498 u64 *res = (u64 *)_res;
4499 int i;
4500
4501 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
4502 u64 nv = new[i];
4503 u64 ov = old[i];
4504 s64 delta = nv - ov;
4505
4506 /* detects if this particular field is 32bit only */
4507 if (((nv | ov) >> 32) == 0)
4508 delta = (s64)(s32)((u32)nv - (u32)ov);
4509
4510 /* filter anomalies, some drivers reset their stats
4511 * at down/up events.
4512 */
4513 if (delta > 0)
4514 res[i] += delta;
4515 }
4516}
4517
4518#ifdef CONFIG_LOCKDEP
4519static int bond_get_lowest_level_rcu(struct net_device *dev)
4520{
4521 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
4522 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
4523 int cur = 0, max = 0;
4524
4525 now = dev;
4526 iter = &dev->adj_list.lower;
4527
4528 while (1) {
4529 next = NULL;
4530 while (1) {
4531 ldev = netdev_next_lower_dev_rcu(now, &iter);
4532 if (!ldev)
4533 break;
4534
4535 next = ldev;
4536 niter = &ldev->adj_list.lower;
4537 dev_stack[cur] = now;
4538 iter_stack[cur++] = iter;
4539 if (max <= cur)
4540 max = cur;
4541 break;
4542 }
4543
4544 if (!next) {
4545 if (!cur)
4546 return max;
4547 next = dev_stack[--cur];
4548 niter = iter_stack[cur];
4549 }
4550
4551 now = next;
4552 iter = niter;
4553 }
4554
4555 return max;
4556}
4557#endif
4558
4559static void bond_get_stats(struct net_device *bond_dev,
4560 struct rtnl_link_stats64 *stats)
4561{
4562 struct bonding *bond = netdev_priv(bond_dev);
4563 struct rtnl_link_stats64 temp;
4564 struct list_head *iter;
4565 struct slave *slave;
4566 int nest_level = 0;
4567
4568
4569 rcu_read_lock();
4570#ifdef CONFIG_LOCKDEP
4571 nest_level = bond_get_lowest_level_rcu(bond_dev);
4572#endif
4573
4574 spin_lock_nested(&bond->stats_lock, nest_level);
4575 memcpy(stats, &bond->bond_stats, sizeof(*stats));
4576
4577 bond_for_each_slave_rcu(bond, slave, iter) {
4578 const struct rtnl_link_stats64 *new =
4579 dev_get_stats(slave->dev, &temp);
4580
4581 bond_fold_stats(stats, new, &slave->slave_stats);
4582
4583 /* save off the slave stats for the next run */
4584 memcpy(&slave->slave_stats, new, sizeof(*new));
4585 }
4586
4587 memcpy(&bond->bond_stats, stats, sizeof(*stats));
4588 spin_unlock(&bond->stats_lock);
4589 rcu_read_unlock();
4590}
4591
4592static int bond_eth_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4593{
4594 struct bonding *bond = netdev_priv(bond_dev);
4595 struct mii_ioctl_data *mii = NULL;
4596
4597 netdev_dbg(bond_dev, "bond_eth_ioctl: cmd=%d\n", cmd);
4598
4599 switch (cmd) {
4600 case SIOCGMIIPHY:
4601 mii = if_mii(ifr);
4602 if (!mii)
4603 return -EINVAL;
4604
4605 mii->phy_id = 0;
4606 fallthrough;
4607 case SIOCGMIIREG:
4608 /* We do this again just in case we were called by SIOCGMIIREG
4609 * instead of SIOCGMIIPHY.
4610 */
4611 mii = if_mii(ifr);
4612 if (!mii)
4613 return -EINVAL;
4614
4615 if (mii->reg_num == 1) {
4616 mii->val_out = 0;
4617 if (netif_carrier_ok(bond->dev))
4618 mii->val_out = BMSR_LSTATUS;
4619 }
4620
4621 break;
4622 default:
4623 return -EOPNOTSUPP;
4624 }
4625
4626 return 0;
4627}
4628
4629static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
4630{
4631 struct bonding *bond = netdev_priv(bond_dev);
4632 struct net_device *slave_dev = NULL;
4633 struct ifbond k_binfo;
4634 struct ifbond __user *u_binfo = NULL;
4635 struct ifslave k_sinfo;
4636 struct ifslave __user *u_sinfo = NULL;
4637 struct bond_opt_value newval;
4638 struct net *net;
4639 int res = 0;
4640
4641 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
4642
4643 switch (cmd) {
4644 case SIOCBONDINFOQUERY:
4645 u_binfo = (struct ifbond __user *)ifr->ifr_data;
4646
4647 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
4648 return -EFAULT;
4649
4650 bond_info_query(bond_dev, &k_binfo);
4651 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
4652 return -EFAULT;
4653
4654 return 0;
4655 case SIOCBONDSLAVEINFOQUERY:
4656 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
4657
4658 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
4659 return -EFAULT;
4660
4661 res = bond_slave_info_query(bond_dev, &k_sinfo);
4662 if (res == 0 &&
4663 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
4664 return -EFAULT;
4665
4666 return res;
4667 default:
4668 break;
4669 }
4670
4671 net = dev_net(bond_dev);
4672
4673 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4674 return -EPERM;
4675
4676 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
4677
4678 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
4679
4680 if (!slave_dev)
4681 return -ENODEV;
4682
4683 switch (cmd) {
4684 case SIOCBONDENSLAVE:
4685 res = bond_enslave(bond_dev, slave_dev, NULL);
4686 break;
4687 case SIOCBONDRELEASE:
4688 res = bond_release(bond_dev, slave_dev);
4689 break;
4690 case SIOCBONDSETHWADDR:
4691 res = bond_set_dev_addr(bond_dev, slave_dev);
4692 break;
4693 case SIOCBONDCHANGEACTIVE:
4694 bond_opt_initstr(&newval, slave_dev->name);
4695 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
4696 &newval);
4697 break;
4698 default:
4699 res = -EOPNOTSUPP;
4700 }
4701
4702 return res;
4703}
4704
4705static int bond_siocdevprivate(struct net_device *bond_dev, struct ifreq *ifr,
4706 void __user *data, int cmd)
4707{
4708 struct ifreq ifrdata = { .ifr_data = data };
4709
4710 switch (cmd) {
4711 case BOND_INFO_QUERY_OLD:
4712 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDINFOQUERY);
4713 case BOND_SLAVE_INFO_QUERY_OLD:
4714 return bond_do_ioctl(bond_dev, &ifrdata, SIOCBONDSLAVEINFOQUERY);
4715 case BOND_ENSLAVE_OLD:
4716 return bond_do_ioctl(bond_dev, ifr, SIOCBONDENSLAVE);
4717 case BOND_RELEASE_OLD:
4718 return bond_do_ioctl(bond_dev, ifr, SIOCBONDRELEASE);
4719 case BOND_SETHWADDR_OLD:
4720 return bond_do_ioctl(bond_dev, ifr, SIOCBONDSETHWADDR);
4721 case BOND_CHANGE_ACTIVE_OLD:
4722 return bond_do_ioctl(bond_dev, ifr, SIOCBONDCHANGEACTIVE);
4723 }
4724
4725 return -EOPNOTSUPP;
4726}
4727
4728static void bond_change_rx_flags(struct net_device *bond_dev, int change)
4729{
4730 struct bonding *bond = netdev_priv(bond_dev);
4731
4732 if (change & IFF_PROMISC)
4733 bond_set_promiscuity(bond,
4734 bond_dev->flags & IFF_PROMISC ? 1 : -1);
4735
4736 if (change & IFF_ALLMULTI)
4737 bond_set_allmulti(bond,
4738 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
4739}
4740
4741static void bond_set_rx_mode(struct net_device *bond_dev)
4742{
4743 struct bonding *bond = netdev_priv(bond_dev);
4744 struct list_head *iter;
4745 struct slave *slave;
4746
4747 rcu_read_lock();
4748 if (bond_uses_primary(bond)) {
4749 slave = rcu_dereference(bond->curr_active_slave);
4750 if (slave) {
4751 dev_uc_sync(slave->dev, bond_dev);
4752 dev_mc_sync(slave->dev, bond_dev);
4753 }
4754 } else {
4755 bond_for_each_slave_rcu(bond, slave, iter) {
4756 dev_uc_sync_multiple(slave->dev, bond_dev);
4757 dev_mc_sync_multiple(slave->dev, bond_dev);
4758 }
4759 }
4760 rcu_read_unlock();
4761}
4762
4763static int bond_neigh_init(struct neighbour *n)
4764{
4765 struct bonding *bond = netdev_priv(n->dev);
4766 const struct net_device_ops *slave_ops;
4767 struct neigh_parms parms;
4768 struct slave *slave;
4769 int ret = 0;
4770
4771 rcu_read_lock();
4772 slave = bond_first_slave_rcu(bond);
4773 if (!slave)
4774 goto out;
4775 slave_ops = slave->dev->netdev_ops;
4776 if (!slave_ops->ndo_neigh_setup)
4777 goto out;
4778
4779 /* TODO: find another way [1] to implement this.
4780 * Passing a zeroed structure is fragile,
4781 * but at least we do not pass garbage.
4782 *
4783 * [1] One way would be that ndo_neigh_setup() never touch
4784 * struct neigh_parms, but propagate the new neigh_setup()
4785 * back to ___neigh_create() / neigh_parms_alloc()
4786 */
4787 memset(&parms, 0, sizeof(parms));
4788 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
4789
4790 if (ret)
4791 goto out;
4792
4793 if (parms.neigh_setup)
4794 ret = parms.neigh_setup(n);
4795out:
4796 rcu_read_unlock();
4797 return ret;
4798}
4799
4800/* The bonding ndo_neigh_setup is called at init time beofre any
4801 * slave exists. So we must declare proxy setup function which will
4802 * be used at run time to resolve the actual slave neigh param setup.
4803 *
4804 * It's also called by master devices (such as vlans) to setup their
4805 * underlying devices. In that case - do nothing, we're already set up from
4806 * our init.
4807 */
4808static int bond_neigh_setup(struct net_device *dev,
4809 struct neigh_parms *parms)
4810{
4811 /* modify only our neigh_parms */
4812 if (parms->dev == dev)
4813 parms->neigh_setup = bond_neigh_init;
4814
4815 return 0;
4816}
4817
4818/* Change the MTU of all of a master's slaves to match the master */
4819static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
4820{
4821 struct bonding *bond = netdev_priv(bond_dev);
4822 struct slave *slave, *rollback_slave;
4823 struct list_head *iter;
4824 int res = 0;
4825
4826 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
4827
4828 bond_for_each_slave(bond, slave, iter) {
4829 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
4830 slave, slave->dev->netdev_ops->ndo_change_mtu);
4831
4832 res = dev_set_mtu(slave->dev, new_mtu);
4833
4834 if (res) {
4835 /* If we failed to set the slave's mtu to the new value
4836 * we must abort the operation even in ACTIVE_BACKUP
4837 * mode, because if we allow the backup slaves to have
4838 * different mtu values than the active slave we'll
4839 * need to change their mtu when doing a failover. That
4840 * means changing their mtu from timer context, which
4841 * is probably not a good idea.
4842 */
4843 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
4844 res, new_mtu);
4845 goto unwind;
4846 }
4847 }
4848
4849 WRITE_ONCE(bond_dev->mtu, new_mtu);
4850
4851 return 0;
4852
4853unwind:
4854 /* unwind from head to the slave that failed */
4855 bond_for_each_slave(bond, rollback_slave, iter) {
4856 int tmp_res;
4857
4858 if (rollback_slave == slave)
4859 break;
4860
4861 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4862 if (tmp_res)
4863 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4864 tmp_res);
4865 }
4866
4867 return res;
4868}
4869
4870/* Change HW address
4871 *
4872 * Note that many devices must be down to change the HW address, and
4873 * downing the master releases all slaves. We can make bonds full of
4874 * bonding devices to test this, however.
4875 */
4876static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4877{
4878 struct bonding *bond = netdev_priv(bond_dev);
4879 struct slave *slave, *rollback_slave;
4880 struct sockaddr_storage *ss = addr, tmp_ss;
4881 struct list_head *iter;
4882 int res = 0;
4883
4884 if (BOND_MODE(bond) == BOND_MODE_ALB)
4885 return bond_alb_set_mac_address(bond_dev, addr);
4886
4887
4888 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4889
4890 /* If fail_over_mac is enabled, do nothing and return success.
4891 * Returning an error causes ifenslave to fail.
4892 */
4893 if (bond->params.fail_over_mac &&
4894 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4895 return 0;
4896
4897 if (!is_valid_ether_addr(ss->__data))
4898 return -EADDRNOTAVAIL;
4899
4900 bond_for_each_slave(bond, slave, iter) {
4901 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4902 __func__, slave);
4903 res = dev_set_mac_address(slave->dev, addr, NULL);
4904 if (res) {
4905 /* TODO: consider downing the slave
4906 * and retry ?
4907 * User should expect communications
4908 * breakage anyway until ARP finish
4909 * updating, so...
4910 */
4911 slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4912 __func__, res);
4913 goto unwind;
4914 }
4915 }
4916
4917 /* success */
4918 dev_addr_set(bond_dev, ss->__data);
4919 return 0;
4920
4921unwind:
4922 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4923 tmp_ss.ss_family = bond_dev->type;
4924
4925 /* unwind from head to the slave that failed */
4926 bond_for_each_slave(bond, rollback_slave, iter) {
4927 int tmp_res;
4928
4929 if (rollback_slave == slave)
4930 break;
4931
4932 tmp_res = dev_set_mac_address(rollback_slave->dev,
4933 (struct sockaddr *)&tmp_ss, NULL);
4934 if (tmp_res) {
4935 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4936 __func__, tmp_res);
4937 }
4938 }
4939
4940 return res;
4941}
4942
4943/**
4944 * bond_get_slave_by_id - get xmit slave with slave_id
4945 * @bond: bonding device that is transmitting
4946 * @slave_id: slave id up to slave_cnt-1 through which to transmit
4947 *
4948 * This function tries to get slave with slave_id but in case
4949 * it fails, it tries to find the first available slave for transmission.
4950 */
4951static struct slave *bond_get_slave_by_id(struct bonding *bond,
4952 int slave_id)
4953{
4954 struct list_head *iter;
4955 struct slave *slave;
4956 int i = slave_id;
4957
4958 /* Here we start from the slave with slave_id */
4959 bond_for_each_slave_rcu(bond, slave, iter) {
4960 if (--i < 0) {
4961 if (bond_slave_can_tx(slave))
4962 return slave;
4963 }
4964 }
4965
4966 /* Here we start from the first slave up to slave_id */
4967 i = slave_id;
4968 bond_for_each_slave_rcu(bond, slave, iter) {
4969 if (--i < 0)
4970 break;
4971 if (bond_slave_can_tx(slave))
4972 return slave;
4973 }
4974 /* no slave that can tx has been found */
4975 return NULL;
4976}
4977
4978/**
4979 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4980 * @bond: bonding device to use
4981 *
4982 * Based on the value of the bonding device's packets_per_slave parameter
4983 * this function generates a slave id, which is usually used as the next
4984 * slave to transmit through.
4985 */
4986static u32 bond_rr_gen_slave_id(struct bonding *bond)
4987{
4988 u32 slave_id;
4989 struct reciprocal_value reciprocal_packets_per_slave;
4990 int packets_per_slave = bond->params.packets_per_slave;
4991
4992 switch (packets_per_slave) {
4993 case 0:
4994 slave_id = get_random_u32();
4995 break;
4996 case 1:
4997 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
4998 break;
4999 default:
5000 reciprocal_packets_per_slave =
5001 bond->params.reciprocal_packets_per_slave;
5002 slave_id = this_cpu_inc_return(*bond->rr_tx_counter);
5003 slave_id = reciprocal_divide(slave_id,
5004 reciprocal_packets_per_slave);
5005 break;
5006 }
5007
5008 return slave_id;
5009}
5010
5011static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
5012 struct sk_buff *skb)
5013{
5014 struct slave *slave;
5015 int slave_cnt;
5016 u32 slave_id;
5017
5018 /* Start with the curr_active_slave that joined the bond as the
5019 * default for sending IGMP traffic. For failover purposes one
5020 * needs to maintain some consistency for the interface that will
5021 * send the join/membership reports. The curr_active_slave found
5022 * will send all of this type of traffic.
5023 */
5024 if (skb->protocol == htons(ETH_P_IP)) {
5025 int noff = skb_network_offset(skb);
5026 struct iphdr *iph;
5027
5028 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
5029 goto non_igmp;
5030
5031 iph = ip_hdr(skb);
5032 if (iph->protocol == IPPROTO_IGMP) {
5033 slave = rcu_dereference(bond->curr_active_slave);
5034 if (slave)
5035 return slave;
5036 return bond_get_slave_by_id(bond, 0);
5037 }
5038 }
5039
5040non_igmp:
5041 slave_cnt = READ_ONCE(bond->slave_cnt);
5042 if (likely(slave_cnt)) {
5043 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
5044 return bond_get_slave_by_id(bond, slave_id);
5045 }
5046 return NULL;
5047}
5048
5049static struct slave *bond_xdp_xmit_roundrobin_slave_get(struct bonding *bond,
5050 struct xdp_buff *xdp)
5051{
5052 struct slave *slave;
5053 int slave_cnt;
5054 u32 slave_id;
5055 const struct ethhdr *eth;
5056 void *data = xdp->data;
5057
5058 if (data + sizeof(struct ethhdr) > xdp->data_end)
5059 goto non_igmp;
5060
5061 eth = (struct ethhdr *)data;
5062 data += sizeof(struct ethhdr);
5063
5064 /* See comment on IGMP in bond_xmit_roundrobin_slave_get() */
5065 if (eth->h_proto == htons(ETH_P_IP)) {
5066 const struct iphdr *iph;
5067
5068 if (data + sizeof(struct iphdr) > xdp->data_end)
5069 goto non_igmp;
5070
5071 iph = (struct iphdr *)data;
5072
5073 if (iph->protocol == IPPROTO_IGMP) {
5074 slave = rcu_dereference(bond->curr_active_slave);
5075 if (slave)
5076 return slave;
5077 return bond_get_slave_by_id(bond, 0);
5078 }
5079 }
5080
5081non_igmp:
5082 slave_cnt = READ_ONCE(bond->slave_cnt);
5083 if (likely(slave_cnt)) {
5084 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
5085 return bond_get_slave_by_id(bond, slave_id);
5086 }
5087 return NULL;
5088}
5089
5090static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
5091 struct net_device *bond_dev)
5092{
5093 struct bonding *bond = netdev_priv(bond_dev);
5094 struct slave *slave;
5095
5096 slave = bond_xmit_roundrobin_slave_get(bond, skb);
5097 if (likely(slave))
5098 return bond_dev_queue_xmit(bond, skb, slave->dev);
5099
5100 return bond_tx_drop(bond_dev, skb);
5101}
5102
5103static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond)
5104{
5105 return rcu_dereference(bond->curr_active_slave);
5106}
5107
5108/* In active-backup mode, we know that bond->curr_active_slave is always valid if
5109 * the bond has a usable interface.
5110 */
5111static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
5112 struct net_device *bond_dev)
5113{
5114 struct bonding *bond = netdev_priv(bond_dev);
5115 struct slave *slave;
5116
5117 slave = bond_xmit_activebackup_slave_get(bond);
5118 if (slave)
5119 return bond_dev_queue_xmit(bond, skb, slave->dev);
5120
5121 return bond_tx_drop(bond_dev, skb);
5122}
5123
5124/* Use this to update slave_array when (a) it's not appropriate to update
5125 * slave_array right away (note that update_slave_array() may sleep)
5126 * and / or (b) RTNL is not held.
5127 */
5128void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
5129{
5130 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
5131}
5132
5133/* Slave array work handler. Holds only RTNL */
5134static void bond_slave_arr_handler(struct work_struct *work)
5135{
5136 struct bonding *bond = container_of(work, struct bonding,
5137 slave_arr_work.work);
5138 int ret;
5139
5140 if (!rtnl_trylock())
5141 goto err;
5142
5143 ret = bond_update_slave_arr(bond, NULL);
5144 rtnl_unlock();
5145 if (ret) {
5146 pr_warn_ratelimited("Failed to update slave array from WT\n");
5147 goto err;
5148 }
5149 return;
5150
5151err:
5152 bond_slave_arr_work_rearm(bond, 1);
5153}
5154
5155static void bond_skip_slave(struct bond_up_slave *slaves,
5156 struct slave *skipslave)
5157{
5158 int idx;
5159
5160 /* Rare situation where caller has asked to skip a specific
5161 * slave but allocation failed (most likely!). BTW this is
5162 * only possible when the call is initiated from
5163 * __bond_release_one(). In this situation; overwrite the
5164 * skipslave entry in the array with the last entry from the
5165 * array to avoid a situation where the xmit path may choose
5166 * this to-be-skipped slave to send a packet out.
5167 */
5168 for (idx = 0; slaves && idx < slaves->count; idx++) {
5169 if (skipslave == slaves->arr[idx]) {
5170 slaves->arr[idx] =
5171 slaves->arr[slaves->count - 1];
5172 slaves->count--;
5173 break;
5174 }
5175 }
5176}
5177
5178static void bond_set_slave_arr(struct bonding *bond,
5179 struct bond_up_slave *usable_slaves,
5180 struct bond_up_slave *all_slaves)
5181{
5182 struct bond_up_slave *usable, *all;
5183
5184 usable = rtnl_dereference(bond->usable_slaves);
5185 rcu_assign_pointer(bond->usable_slaves, usable_slaves);
5186 kfree_rcu(usable, rcu);
5187
5188 all = rtnl_dereference(bond->all_slaves);
5189 rcu_assign_pointer(bond->all_slaves, all_slaves);
5190 kfree_rcu(all, rcu);
5191}
5192
5193static void bond_reset_slave_arr(struct bonding *bond)
5194{
5195 bond_set_slave_arr(bond, NULL, NULL);
5196}
5197
5198/* Build the usable slaves array in control path for modes that use xmit-hash
5199 * to determine the slave interface -
5200 * (a) BOND_MODE_8023AD
5201 * (b) BOND_MODE_XOR
5202 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
5203 *
5204 * The caller is expected to hold RTNL only and NO other lock!
5205 */
5206int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
5207{
5208 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
5209 struct slave *slave;
5210 struct list_head *iter;
5211 int agg_id = 0;
5212 int ret = 0;
5213
5214 might_sleep();
5215
5216 usable_slaves = kzalloc(struct_size(usable_slaves, arr,
5217 bond->slave_cnt), GFP_KERNEL);
5218 all_slaves = kzalloc(struct_size(all_slaves, arr,
5219 bond->slave_cnt), GFP_KERNEL);
5220 if (!usable_slaves || !all_slaves) {
5221 ret = -ENOMEM;
5222 goto out;
5223 }
5224 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5225 struct ad_info ad_info;
5226
5227 spin_lock_bh(&bond->mode_lock);
5228 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
5229 spin_unlock_bh(&bond->mode_lock);
5230 pr_debug("bond_3ad_get_active_agg_info failed\n");
5231 /* No active aggragator means it's not safe to use
5232 * the previous array.
5233 */
5234 bond_reset_slave_arr(bond);
5235 goto out;
5236 }
5237 spin_unlock_bh(&bond->mode_lock);
5238 agg_id = ad_info.aggregator_id;
5239 }
5240 bond_for_each_slave(bond, slave, iter) {
5241 if (skipslave == slave)
5242 continue;
5243
5244 all_slaves->arr[all_slaves->count++] = slave;
5245 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
5246 struct aggregator *agg;
5247
5248 agg = SLAVE_AD_INFO(slave)->port.aggregator;
5249 if (!agg || agg->aggregator_identifier != agg_id)
5250 continue;
5251 }
5252 if (!bond_slave_can_tx(slave))
5253 continue;
5254
5255 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
5256 usable_slaves->count);
5257
5258 usable_slaves->arr[usable_slaves->count++] = slave;
5259 }
5260
5261 bond_set_slave_arr(bond, usable_slaves, all_slaves);
5262 return ret;
5263out:
5264 if (ret != 0 && skipslave) {
5265 bond_skip_slave(rtnl_dereference(bond->all_slaves),
5266 skipslave);
5267 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
5268 skipslave);
5269 }
5270 kfree_rcu(all_slaves, rcu);
5271 kfree_rcu(usable_slaves, rcu);
5272
5273 return ret;
5274}
5275
5276static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
5277 struct sk_buff *skb,
5278 struct bond_up_slave *slaves)
5279{
5280 struct slave *slave;
5281 unsigned int count;
5282 u32 hash;
5283
5284 hash = bond_xmit_hash(bond, skb);
5285 count = slaves ? READ_ONCE(slaves->count) : 0;
5286 if (unlikely(!count))
5287 return NULL;
5288
5289 slave = slaves->arr[hash % count];
5290 return slave;
5291}
5292
5293static struct slave *bond_xdp_xmit_3ad_xor_slave_get(struct bonding *bond,
5294 struct xdp_buff *xdp)
5295{
5296 struct bond_up_slave *slaves;
5297 unsigned int count;
5298 u32 hash;
5299
5300 hash = bond_xmit_hash_xdp(bond, xdp);
5301 slaves = rcu_dereference(bond->usable_slaves);
5302 count = slaves ? READ_ONCE(slaves->count) : 0;
5303 if (unlikely(!count))
5304 return NULL;
5305
5306 return slaves->arr[hash % count];
5307}
5308
5309/* Use this Xmit function for 3AD as well as XOR modes. The current
5310 * usable slave array is formed in the control path. The xmit function
5311 * just calculates hash and sends the packet out.
5312 */
5313static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
5314 struct net_device *dev)
5315{
5316 struct bonding *bond = netdev_priv(dev);
5317 struct bond_up_slave *slaves;
5318 struct slave *slave;
5319
5320 slaves = rcu_dereference(bond->usable_slaves);
5321 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5322 if (likely(slave))
5323 return bond_dev_queue_xmit(bond, skb, slave->dev);
5324
5325 return bond_tx_drop(dev, skb);
5326}
5327
5328/* in broadcast mode, we send everything to all usable interfaces. */
5329static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
5330 struct net_device *bond_dev)
5331{
5332 struct bonding *bond = netdev_priv(bond_dev);
5333 struct slave *slave = NULL;
5334 struct list_head *iter;
5335 bool xmit_suc = false;
5336 bool skb_used = false;
5337
5338 bond_for_each_slave_rcu(bond, slave, iter) {
5339 struct sk_buff *skb2;
5340
5341 if (!(bond_slave_is_up(slave) && slave->link == BOND_LINK_UP))
5342 continue;
5343
5344 if (bond_is_last_slave(bond, slave)) {
5345 skb2 = skb;
5346 skb_used = true;
5347 } else {
5348 skb2 = skb_clone(skb, GFP_ATOMIC);
5349 if (!skb2) {
5350 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
5351 bond_dev->name, __func__);
5352 continue;
5353 }
5354 }
5355
5356 if (bond_dev_queue_xmit(bond, skb2, slave->dev) == NETDEV_TX_OK)
5357 xmit_suc = true;
5358 }
5359
5360 if (!skb_used)
5361 dev_kfree_skb_any(skb);
5362
5363 if (xmit_suc)
5364 return NETDEV_TX_OK;
5365
5366 dev_core_stats_tx_dropped_inc(bond_dev);
5367 return NET_XMIT_DROP;
5368}
5369
5370/*------------------------- Device initialization ---------------------------*/
5371
5372/* Lookup the slave that corresponds to a qid */
5373static inline int bond_slave_override(struct bonding *bond,
5374 struct sk_buff *skb)
5375{
5376 struct slave *slave = NULL;
5377 struct list_head *iter;
5378
5379 if (!skb_rx_queue_recorded(skb))
5380 return 1;
5381
5382 /* Find out if any slaves have the same mapping as this skb. */
5383 bond_for_each_slave_rcu(bond, slave, iter) {
5384 if (READ_ONCE(slave->queue_id) == skb_get_queue_mapping(skb)) {
5385 if (bond_slave_is_up(slave) &&
5386 slave->link == BOND_LINK_UP) {
5387 bond_dev_queue_xmit(bond, skb, slave->dev);
5388 return 0;
5389 }
5390 /* If the slave isn't UP, use default transmit policy. */
5391 break;
5392 }
5393 }
5394
5395 return 1;
5396}
5397
5398
5399static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
5400 struct net_device *sb_dev)
5401{
5402 /* This helper function exists to help dev_pick_tx get the correct
5403 * destination queue. Using a helper function skips a call to
5404 * skb_tx_hash and will put the skbs in the queue we expect on their
5405 * way down to the bonding driver.
5406 */
5407 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
5408
5409 /* Save the original txq to restore before passing to the driver */
5410 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
5411
5412 if (unlikely(txq >= dev->real_num_tx_queues)) {
5413 do {
5414 txq -= dev->real_num_tx_queues;
5415 } while (txq >= dev->real_num_tx_queues);
5416 }
5417 return txq;
5418}
5419
5420static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
5421 struct sk_buff *skb,
5422 bool all_slaves)
5423{
5424 struct bonding *bond = netdev_priv(master_dev);
5425 struct bond_up_slave *slaves;
5426 struct slave *slave = NULL;
5427
5428 switch (BOND_MODE(bond)) {
5429 case BOND_MODE_ROUNDROBIN:
5430 slave = bond_xmit_roundrobin_slave_get(bond, skb);
5431 break;
5432 case BOND_MODE_ACTIVEBACKUP:
5433 slave = bond_xmit_activebackup_slave_get(bond);
5434 break;
5435 case BOND_MODE_8023AD:
5436 case BOND_MODE_XOR:
5437 if (all_slaves)
5438 slaves = rcu_dereference(bond->all_slaves);
5439 else
5440 slaves = rcu_dereference(bond->usable_slaves);
5441 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
5442 break;
5443 case BOND_MODE_BROADCAST:
5444 break;
5445 case BOND_MODE_ALB:
5446 slave = bond_xmit_alb_slave_get(bond, skb);
5447 break;
5448 case BOND_MODE_TLB:
5449 slave = bond_xmit_tlb_slave_get(bond, skb);
5450 break;
5451 default:
5452 /* Should never happen, mode already checked */
5453 WARN_ONCE(true, "Unknown bonding mode");
5454 break;
5455 }
5456
5457 if (slave)
5458 return slave->dev;
5459 return NULL;
5460}
5461
5462static void bond_sk_to_flow(struct sock *sk, struct flow_keys *flow)
5463{
5464 switch (sk->sk_family) {
5465#if IS_ENABLED(CONFIG_IPV6)
5466 case AF_INET6:
5467 if (ipv6_only_sock(sk) ||
5468 ipv6_addr_type(&sk->sk_v6_daddr) != IPV6_ADDR_MAPPED) {
5469 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
5470 flow->addrs.v6addrs.src = inet6_sk(sk)->saddr;
5471 flow->addrs.v6addrs.dst = sk->sk_v6_daddr;
5472 break;
5473 }
5474 fallthrough;
5475#endif
5476 default: /* AF_INET */
5477 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
5478 flow->addrs.v4addrs.src = inet_sk(sk)->inet_rcv_saddr;
5479 flow->addrs.v4addrs.dst = inet_sk(sk)->inet_daddr;
5480 break;
5481 }
5482
5483 flow->ports.src = inet_sk(sk)->inet_sport;
5484 flow->ports.dst = inet_sk(sk)->inet_dport;
5485}
5486
5487/**
5488 * bond_sk_hash_l34 - generate a hash value based on the socket's L3 and L4 fields
5489 * @sk: socket to use for headers
5490 *
5491 * This function will extract the necessary field from the socket and use
5492 * them to generate a hash based on the LAYER34 xmit_policy.
5493 * Assumes that sk is a TCP or UDP socket.
5494 */
5495static u32 bond_sk_hash_l34(struct sock *sk)
5496{
5497 struct flow_keys flow;
5498 u32 hash;
5499
5500 bond_sk_to_flow(sk, &flow);
5501
5502 /* L4 */
5503 memcpy(&hash, &flow.ports.ports, sizeof(hash));
5504 /* L3 */
5505 return bond_ip_hash(hash, &flow, BOND_XMIT_POLICY_LAYER34);
5506}
5507
5508static struct net_device *__bond_sk_get_lower_dev(struct bonding *bond,
5509 struct sock *sk)
5510{
5511 struct bond_up_slave *slaves;
5512 struct slave *slave;
5513 unsigned int count;
5514 u32 hash;
5515
5516 slaves = rcu_dereference(bond->usable_slaves);
5517 count = slaves ? READ_ONCE(slaves->count) : 0;
5518 if (unlikely(!count))
5519 return NULL;
5520
5521 hash = bond_sk_hash_l34(sk);
5522 slave = slaves->arr[hash % count];
5523
5524 return slave->dev;
5525}
5526
5527static struct net_device *bond_sk_get_lower_dev(struct net_device *dev,
5528 struct sock *sk)
5529{
5530 struct bonding *bond = netdev_priv(dev);
5531 struct net_device *lower = NULL;
5532
5533 rcu_read_lock();
5534 if (bond_sk_check(bond))
5535 lower = __bond_sk_get_lower_dev(bond, sk);
5536 rcu_read_unlock();
5537
5538 return lower;
5539}
5540
5541#if IS_ENABLED(CONFIG_TLS_DEVICE)
5542static netdev_tx_t bond_tls_device_xmit(struct bonding *bond, struct sk_buff *skb,
5543 struct net_device *dev)
5544{
5545 struct net_device *tls_netdev = rcu_dereference(tls_get_ctx(skb->sk)->netdev);
5546
5547 /* tls_netdev might become NULL, even if tls_is_skb_tx_device_offloaded
5548 * was true, if tls_device_down is running in parallel, but it's OK,
5549 * because bond_get_slave_by_dev has a NULL check.
5550 */
5551 if (likely(bond_get_slave_by_dev(bond, tls_netdev)))
5552 return bond_dev_queue_xmit(bond, skb, tls_netdev);
5553 return bond_tx_drop(dev, skb);
5554}
5555#endif
5556
5557static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5558{
5559 struct bonding *bond = netdev_priv(dev);
5560
5561 if (bond_should_override_tx_queue(bond) &&
5562 !bond_slave_override(bond, skb))
5563 return NETDEV_TX_OK;
5564
5565#if IS_ENABLED(CONFIG_TLS_DEVICE)
5566 if (tls_is_skb_tx_device_offloaded(skb))
5567 return bond_tls_device_xmit(bond, skb, dev);
5568#endif
5569
5570 switch (BOND_MODE(bond)) {
5571 case BOND_MODE_ROUNDROBIN:
5572 return bond_xmit_roundrobin(skb, dev);
5573 case BOND_MODE_ACTIVEBACKUP:
5574 return bond_xmit_activebackup(skb, dev);
5575 case BOND_MODE_8023AD:
5576 case BOND_MODE_XOR:
5577 return bond_3ad_xor_xmit(skb, dev);
5578 case BOND_MODE_BROADCAST:
5579 return bond_xmit_broadcast(skb, dev);
5580 case BOND_MODE_ALB:
5581 return bond_alb_xmit(skb, dev);
5582 case BOND_MODE_TLB:
5583 return bond_tlb_xmit(skb, dev);
5584 default:
5585 /* Should never happen, mode already checked */
5586 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
5587 WARN_ON_ONCE(1);
5588 return bond_tx_drop(dev, skb);
5589 }
5590}
5591
5592static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
5593{
5594 struct bonding *bond = netdev_priv(dev);
5595 netdev_tx_t ret = NETDEV_TX_OK;
5596
5597 /* If we risk deadlock from transmitting this in the
5598 * netpoll path, tell netpoll to queue the frame for later tx
5599 */
5600 if (unlikely(is_netpoll_tx_blocked(dev)))
5601 return NETDEV_TX_BUSY;
5602
5603 rcu_read_lock();
5604 if (bond_has_slaves(bond))
5605 ret = __bond_start_xmit(skb, dev);
5606 else
5607 ret = bond_tx_drop(dev, skb);
5608 rcu_read_unlock();
5609
5610 return ret;
5611}
5612
5613static struct net_device *
5614bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp)
5615{
5616 struct bonding *bond = netdev_priv(bond_dev);
5617 struct slave *slave;
5618
5619 /* Caller needs to hold rcu_read_lock() */
5620
5621 switch (BOND_MODE(bond)) {
5622 case BOND_MODE_ROUNDROBIN:
5623 slave = bond_xdp_xmit_roundrobin_slave_get(bond, xdp);
5624 break;
5625
5626 case BOND_MODE_ACTIVEBACKUP:
5627 slave = bond_xmit_activebackup_slave_get(bond);
5628 break;
5629
5630 case BOND_MODE_8023AD:
5631 case BOND_MODE_XOR:
5632 slave = bond_xdp_xmit_3ad_xor_slave_get(bond, xdp);
5633 break;
5634
5635 default:
5636 if (net_ratelimit())
5637 netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n",
5638 BOND_MODE(bond));
5639 return NULL;
5640 }
5641
5642 if (slave)
5643 return slave->dev;
5644
5645 return NULL;
5646}
5647
5648static int bond_xdp_xmit(struct net_device *bond_dev,
5649 int n, struct xdp_frame **frames, u32 flags)
5650{
5651 int nxmit, err = -ENXIO;
5652
5653 rcu_read_lock();
5654
5655 for (nxmit = 0; nxmit < n; nxmit++) {
5656 struct xdp_frame *frame = frames[nxmit];
5657 struct xdp_frame *frames1[] = {frame};
5658 struct net_device *slave_dev;
5659 struct xdp_buff xdp;
5660
5661 xdp_convert_frame_to_buff(frame, &xdp);
5662
5663 slave_dev = bond_xdp_get_xmit_slave(bond_dev, &xdp);
5664 if (!slave_dev) {
5665 err = -ENXIO;
5666 break;
5667 }
5668
5669 err = slave_dev->netdev_ops->ndo_xdp_xmit(slave_dev, 1, frames1, flags);
5670 if (err < 1)
5671 break;
5672 }
5673
5674 rcu_read_unlock();
5675
5676 /* If error happened on the first frame then we can pass the error up, otherwise
5677 * report the number of frames that were xmitted.
5678 */
5679 if (err < 0)
5680 return (nxmit == 0 ? err : nxmit);
5681
5682 return nxmit;
5683}
5684
5685static int bond_xdp_set(struct net_device *dev, struct bpf_prog *prog,
5686 struct netlink_ext_ack *extack)
5687{
5688 struct bonding *bond = netdev_priv(dev);
5689 struct list_head *iter;
5690 struct slave *slave, *rollback_slave;
5691 struct bpf_prog *old_prog;
5692 struct netdev_bpf xdp = {
5693 .command = XDP_SETUP_PROG,
5694 .flags = 0,
5695 .prog = prog,
5696 .extack = extack,
5697 };
5698 int err;
5699
5700 ASSERT_RTNL();
5701
5702 if (!bond_xdp_check(bond)) {
5703 BOND_NL_ERR(dev, extack,
5704 "No native XDP support for the current bonding mode");
5705 return -EOPNOTSUPP;
5706 }
5707
5708 old_prog = bond->xdp_prog;
5709 bond->xdp_prog = prog;
5710
5711 bond_for_each_slave(bond, slave, iter) {
5712 struct net_device *slave_dev = slave->dev;
5713
5714 if (!slave_dev->netdev_ops->ndo_bpf ||
5715 !slave_dev->netdev_ops->ndo_xdp_xmit) {
5716 SLAVE_NL_ERR(dev, slave_dev, extack,
5717 "Slave device does not support XDP");
5718 err = -EOPNOTSUPP;
5719 goto err;
5720 }
5721
5722 if (dev_xdp_prog_count(slave_dev) > 0) {
5723 SLAVE_NL_ERR(dev, slave_dev, extack,
5724 "Slave has XDP program loaded, please unload before enslaving");
5725 err = -EOPNOTSUPP;
5726 goto err;
5727 }
5728
5729 err = dev_xdp_propagate(slave_dev, &xdp);
5730 if (err < 0) {
5731 /* ndo_bpf() sets extack error message */
5732 slave_err(dev, slave_dev, "Error %d calling ndo_bpf\n", err);
5733 goto err;
5734 }
5735 if (prog)
5736 bpf_prog_inc(prog);
5737 }
5738
5739 if (prog) {
5740 static_branch_inc(&bpf_master_redirect_enabled_key);
5741 } else if (old_prog) {
5742 bpf_prog_put(old_prog);
5743 static_branch_dec(&bpf_master_redirect_enabled_key);
5744 }
5745
5746 return 0;
5747
5748err:
5749 /* unwind the program changes */
5750 bond->xdp_prog = old_prog;
5751 xdp.prog = old_prog;
5752 xdp.extack = NULL; /* do not overwrite original error */
5753
5754 bond_for_each_slave(bond, rollback_slave, iter) {
5755 struct net_device *slave_dev = rollback_slave->dev;
5756 int err_unwind;
5757
5758 if (slave == rollback_slave)
5759 break;
5760
5761 err_unwind = dev_xdp_propagate(slave_dev, &xdp);
5762 if (err_unwind < 0)
5763 slave_err(dev, slave_dev,
5764 "Error %d when unwinding XDP program change\n", err_unwind);
5765 else if (xdp.prog)
5766 bpf_prog_inc(xdp.prog);
5767 }
5768 return err;
5769}
5770
5771static int bond_xdp(struct net_device *dev, struct netdev_bpf *xdp)
5772{
5773 switch (xdp->command) {
5774 case XDP_SETUP_PROG:
5775 return bond_xdp_set(dev, xdp->prog, xdp->extack);
5776 default:
5777 return -EINVAL;
5778 }
5779}
5780
5781static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
5782{
5783 if (speed == 0 || speed == SPEED_UNKNOWN)
5784 speed = slave->speed;
5785 else
5786 speed = min(speed, slave->speed);
5787
5788 return speed;
5789}
5790
5791/* Set the BOND_PHC_INDEX flag to notify user space */
5792static int bond_set_phc_index_flag(struct kernel_hwtstamp_config *kernel_cfg)
5793{
5794 struct ifreq *ifr = kernel_cfg->ifr;
5795 struct hwtstamp_config cfg;
5796
5797 if (kernel_cfg->copied_to_user) {
5798 /* Lower device has a legacy implementation */
5799 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
5800 return -EFAULT;
5801
5802 cfg.flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
5803 if (copy_to_user(ifr->ifr_data, &cfg, sizeof(cfg)))
5804 return -EFAULT;
5805 } else {
5806 kernel_cfg->flags |= HWTSTAMP_FLAG_BONDED_PHC_INDEX;
5807 }
5808
5809 return 0;
5810}
5811
5812static int bond_hwtstamp_get(struct net_device *dev,
5813 struct kernel_hwtstamp_config *cfg)
5814{
5815 struct bonding *bond = netdev_priv(dev);
5816 struct net_device *real_dev;
5817 int err;
5818
5819 real_dev = bond_option_active_slave_get_rcu(bond);
5820 if (!real_dev)
5821 return -EOPNOTSUPP;
5822
5823 err = generic_hwtstamp_get_lower(real_dev, cfg);
5824 if (err)
5825 return err;
5826
5827 return bond_set_phc_index_flag(cfg);
5828}
5829
5830static int bond_hwtstamp_set(struct net_device *dev,
5831 struct kernel_hwtstamp_config *cfg,
5832 struct netlink_ext_ack *extack)
5833{
5834 struct bonding *bond = netdev_priv(dev);
5835 struct net_device *real_dev;
5836 int err;
5837
5838 if (!(cfg->flags & HWTSTAMP_FLAG_BONDED_PHC_INDEX))
5839 return -EOPNOTSUPP;
5840
5841 real_dev = bond_option_active_slave_get_rcu(bond);
5842 if (!real_dev)
5843 return -EOPNOTSUPP;
5844
5845 err = generic_hwtstamp_set_lower(real_dev, cfg, extack);
5846 if (err)
5847 return err;
5848
5849 return bond_set_phc_index_flag(cfg);
5850}
5851
5852static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
5853 struct ethtool_link_ksettings *cmd)
5854{
5855 struct bonding *bond = netdev_priv(bond_dev);
5856 struct list_head *iter;
5857 struct slave *slave;
5858 u32 speed = 0;
5859
5860 cmd->base.duplex = DUPLEX_UNKNOWN;
5861 cmd->base.port = PORT_OTHER;
5862
5863 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
5864 * do not need to check mode. Though link speed might not represent
5865 * the true receive or transmit bandwidth (not all modes are symmetric)
5866 * this is an accurate maximum.
5867 */
5868 bond_for_each_slave(bond, slave, iter) {
5869 if (bond_slave_can_tx(slave)) {
5870 bond_update_speed_duplex(slave);
5871 if (slave->speed != SPEED_UNKNOWN) {
5872 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
5873 speed = bond_mode_bcast_speed(slave,
5874 speed);
5875 else
5876 speed += slave->speed;
5877 }
5878 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
5879 slave->duplex != DUPLEX_UNKNOWN)
5880 cmd->base.duplex = slave->duplex;
5881 }
5882 }
5883 cmd->base.speed = speed ? : SPEED_UNKNOWN;
5884
5885 return 0;
5886}
5887
5888static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
5889 struct ethtool_drvinfo *drvinfo)
5890{
5891 strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
5892 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
5893 BOND_ABI_VERSION);
5894}
5895
5896static int bond_ethtool_get_ts_info(struct net_device *bond_dev,
5897 struct kernel_ethtool_ts_info *info)
5898{
5899 struct bonding *bond = netdev_priv(bond_dev);
5900 struct kernel_ethtool_ts_info ts_info;
5901 struct net_device *real_dev;
5902 bool sw_tx_support = false;
5903 struct list_head *iter;
5904 struct slave *slave;
5905 int ret = 0;
5906
5907 rcu_read_lock();
5908 real_dev = bond_option_active_slave_get_rcu(bond);
5909 dev_hold(real_dev);
5910 rcu_read_unlock();
5911
5912 if (real_dev) {
5913 ret = ethtool_get_ts_info_by_layer(real_dev, info);
5914 } else {
5915 /* Check if all slaves support software tx timestamping */
5916 rcu_read_lock();
5917 bond_for_each_slave_rcu(bond, slave, iter) {
5918 ret = ethtool_get_ts_info_by_layer(slave->dev, &ts_info);
5919 if (!ret && (ts_info.so_timestamping & SOF_TIMESTAMPING_TX_SOFTWARE)) {
5920 sw_tx_support = true;
5921 continue;
5922 }
5923
5924 sw_tx_support = false;
5925 break;
5926 }
5927 rcu_read_unlock();
5928 }
5929
5930 if (sw_tx_support)
5931 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
5932
5933 dev_put(real_dev);
5934 return ret;
5935}
5936
5937static const struct ethtool_ops bond_ethtool_ops = {
5938 .get_drvinfo = bond_ethtool_get_drvinfo,
5939 .get_link = ethtool_op_get_link,
5940 .get_link_ksettings = bond_ethtool_get_link_ksettings,
5941 .get_ts_info = bond_ethtool_get_ts_info,
5942};
5943
5944static const struct net_device_ops bond_netdev_ops = {
5945 .ndo_init = bond_init,
5946 .ndo_uninit = bond_uninit,
5947 .ndo_open = bond_open,
5948 .ndo_stop = bond_close,
5949 .ndo_start_xmit = bond_start_xmit,
5950 .ndo_select_queue = bond_select_queue,
5951 .ndo_get_stats64 = bond_get_stats,
5952 .ndo_eth_ioctl = bond_eth_ioctl,
5953 .ndo_siocbond = bond_do_ioctl,
5954 .ndo_siocdevprivate = bond_siocdevprivate,
5955 .ndo_change_rx_flags = bond_change_rx_flags,
5956 .ndo_set_rx_mode = bond_set_rx_mode,
5957 .ndo_change_mtu = bond_change_mtu,
5958 .ndo_set_mac_address = bond_set_mac_address,
5959 .ndo_neigh_setup = bond_neigh_setup,
5960 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
5961 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
5962#ifdef CONFIG_NET_POLL_CONTROLLER
5963 .ndo_netpoll_setup = bond_netpoll_setup,
5964 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
5965 .ndo_poll_controller = bond_poll_controller,
5966#endif
5967 .ndo_add_slave = bond_enslave,
5968 .ndo_del_slave = bond_release,
5969 .ndo_fix_features = bond_fix_features,
5970 .ndo_features_check = passthru_features_check,
5971 .ndo_get_xmit_slave = bond_xmit_get_slave,
5972 .ndo_sk_get_lower_dev = bond_sk_get_lower_dev,
5973 .ndo_bpf = bond_xdp,
5974 .ndo_xdp_xmit = bond_xdp_xmit,
5975 .ndo_xdp_get_xmit_slave = bond_xdp_get_xmit_slave,
5976 .ndo_hwtstamp_get = bond_hwtstamp_get,
5977 .ndo_hwtstamp_set = bond_hwtstamp_set,
5978};
5979
5980static const struct device_type bond_type = {
5981 .name = "bond",
5982};
5983
5984static void bond_destructor(struct net_device *bond_dev)
5985{
5986 struct bonding *bond = netdev_priv(bond_dev);
5987
5988 if (bond->wq)
5989 destroy_workqueue(bond->wq);
5990
5991 free_percpu(bond->rr_tx_counter);
5992}
5993
5994void bond_setup(struct net_device *bond_dev)
5995{
5996 struct bonding *bond = netdev_priv(bond_dev);
5997
5998 spin_lock_init(&bond->mode_lock);
5999 bond->params = bonding_defaults;
6000
6001 /* Initialize pointers */
6002 bond->dev = bond_dev;
6003
6004 /* Initialize the device entry points */
6005 ether_setup(bond_dev);
6006 bond_dev->max_mtu = ETH_MAX_MTU;
6007 bond_dev->netdev_ops = &bond_netdev_ops;
6008 bond_dev->ethtool_ops = &bond_ethtool_ops;
6009
6010 bond_dev->needs_free_netdev = true;
6011 bond_dev->priv_destructor = bond_destructor;
6012
6013 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
6014
6015 /* Initialize the device options */
6016 bond_dev->flags |= IFF_MASTER;
6017 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
6018 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
6019
6020#ifdef CONFIG_XFRM_OFFLOAD
6021 /* set up xfrm device ops (only supported in active-backup right now) */
6022 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
6023 INIT_LIST_HEAD(&bond->ipsec_list);
6024 mutex_init(&bond->ipsec_lock);
6025#endif /* CONFIG_XFRM_OFFLOAD */
6026
6027 /* don't acquire bond device's netif_tx_lock when transmitting */
6028 bond_dev->lltx = true;
6029
6030 /* Don't allow bond devices to change network namespaces. */
6031 bond_dev->netns_local = true;
6032
6033 /* By default, we declare the bond to be fully
6034 * VLAN hardware accelerated capable. Special
6035 * care is taken in the various xmit functions
6036 * when there are slaves that are not hw accel
6037 * capable
6038 */
6039
6040 bond_dev->hw_features = BOND_VLAN_FEATURES |
6041 NETIF_F_HW_VLAN_CTAG_RX |
6042 NETIF_F_HW_VLAN_CTAG_FILTER |
6043 NETIF_F_HW_VLAN_STAG_RX |
6044 NETIF_F_HW_VLAN_STAG_FILTER;
6045
6046 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
6047 bond_dev->features |= bond_dev->hw_features;
6048 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
6049 bond_dev->features |= NETIF_F_GSO_PARTIAL;
6050#ifdef CONFIG_XFRM_OFFLOAD
6051 bond_dev->hw_features |= BOND_XFRM_FEATURES;
6052 /* Only enable XFRM features if this is an active-backup config */
6053 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
6054 bond_dev->features |= BOND_XFRM_FEATURES;
6055#endif /* CONFIG_XFRM_OFFLOAD */
6056}
6057
6058/* Destroy a bonding device.
6059 * Must be under rtnl_lock when this function is called.
6060 */
6061static void bond_uninit(struct net_device *bond_dev)
6062{
6063 struct bonding *bond = netdev_priv(bond_dev);
6064 struct list_head *iter;
6065 struct slave *slave;
6066
6067 bond_netpoll_cleanup(bond_dev);
6068
6069 /* Release the bonded slaves */
6070 bond_for_each_slave(bond, slave, iter)
6071 __bond_release_one(bond_dev, slave->dev, true, true);
6072 netdev_info(bond_dev, "Released all slaves\n");
6073
6074#ifdef CONFIG_XFRM_OFFLOAD
6075 mutex_destroy(&bond->ipsec_lock);
6076#endif /* CONFIG_XFRM_OFFLOAD */
6077
6078 bond_set_slave_arr(bond, NULL, NULL);
6079
6080 list_del_rcu(&bond->bond_list);
6081
6082 bond_debug_unregister(bond);
6083}
6084
6085/*------------------------- Module initialization ---------------------------*/
6086
6087static int __init bond_check_params(struct bond_params *params)
6088{
6089 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
6090 struct bond_opt_value newval;
6091 const struct bond_opt_value *valptr;
6092 int arp_all_targets_value = 0;
6093 u16 ad_actor_sys_prio = 0;
6094 u16 ad_user_port_key = 0;
6095 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
6096 int arp_ip_count;
6097 int bond_mode = BOND_MODE_ROUNDROBIN;
6098 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
6099 int lacp_fast = 0;
6100 int tlb_dynamic_lb;
6101
6102 /* Convert string parameters. */
6103 if (mode) {
6104 bond_opt_initstr(&newval, mode);
6105 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
6106 if (!valptr) {
6107 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
6108 return -EINVAL;
6109 }
6110 bond_mode = valptr->value;
6111 }
6112
6113 if (xmit_hash_policy) {
6114 if (bond_mode == BOND_MODE_ROUNDROBIN ||
6115 bond_mode == BOND_MODE_ACTIVEBACKUP ||
6116 bond_mode == BOND_MODE_BROADCAST) {
6117 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
6118 bond_mode_name(bond_mode));
6119 } else {
6120 bond_opt_initstr(&newval, xmit_hash_policy);
6121 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
6122 &newval);
6123 if (!valptr) {
6124 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
6125 xmit_hash_policy);
6126 return -EINVAL;
6127 }
6128 xmit_hashtype = valptr->value;
6129 }
6130 }
6131
6132 if (lacp_rate) {
6133 if (bond_mode != BOND_MODE_8023AD) {
6134 pr_info("lacp_rate param is irrelevant in mode %s\n",
6135 bond_mode_name(bond_mode));
6136 } else {
6137 bond_opt_initstr(&newval, lacp_rate);
6138 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
6139 &newval);
6140 if (!valptr) {
6141 pr_err("Error: Invalid lacp rate \"%s\"\n",
6142 lacp_rate);
6143 return -EINVAL;
6144 }
6145 lacp_fast = valptr->value;
6146 }
6147 }
6148
6149 if (ad_select) {
6150 bond_opt_initstr(&newval, ad_select);
6151 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
6152 &newval);
6153 if (!valptr) {
6154 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
6155 return -EINVAL;
6156 }
6157 params->ad_select = valptr->value;
6158 if (bond_mode != BOND_MODE_8023AD)
6159 pr_warn("ad_select param only affects 802.3ad mode\n");
6160 } else {
6161 params->ad_select = BOND_AD_STABLE;
6162 }
6163
6164 if (max_bonds < 0) {
6165 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
6166 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
6167 max_bonds = BOND_DEFAULT_MAX_BONDS;
6168 }
6169
6170 if (miimon < 0) {
6171 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6172 miimon, INT_MAX);
6173 miimon = 0;
6174 }
6175
6176 if (updelay < 0) {
6177 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6178 updelay, INT_MAX);
6179 updelay = 0;
6180 }
6181
6182 if (downdelay < 0) {
6183 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6184 downdelay, INT_MAX);
6185 downdelay = 0;
6186 }
6187
6188 if ((use_carrier != 0) && (use_carrier != 1)) {
6189 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
6190 use_carrier);
6191 use_carrier = 1;
6192 }
6193
6194 if (num_peer_notif < 0 || num_peer_notif > 255) {
6195 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
6196 num_peer_notif);
6197 num_peer_notif = 1;
6198 }
6199
6200 /* reset values for 802.3ad/TLB/ALB */
6201 if (!bond_mode_uses_arp(bond_mode)) {
6202 if (!miimon) {
6203 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");
6204 pr_warn("Forcing miimon to 100msec\n");
6205 miimon = BOND_DEFAULT_MIIMON;
6206 }
6207 }
6208
6209 if (tx_queues < 1 || tx_queues > 255) {
6210 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
6211 tx_queues, BOND_DEFAULT_TX_QUEUES);
6212 tx_queues = BOND_DEFAULT_TX_QUEUES;
6213 }
6214
6215 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
6216 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
6217 all_slaves_active);
6218 all_slaves_active = 0;
6219 }
6220
6221 if (resend_igmp < 0 || resend_igmp > 255) {
6222 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
6223 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
6224 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
6225 }
6226
6227 bond_opt_initval(&newval, packets_per_slave);
6228 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
6229 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
6230 packets_per_slave, USHRT_MAX);
6231 packets_per_slave = 1;
6232 }
6233
6234 if (bond_mode == BOND_MODE_ALB) {
6235 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",
6236 updelay);
6237 }
6238
6239 if (!miimon) {
6240 if (updelay || downdelay) {
6241 /* just warn the user the up/down delay will have
6242 * no effect since miimon is zero...
6243 */
6244 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",
6245 updelay, downdelay);
6246 }
6247 } else {
6248 /* don't allow arp monitoring */
6249 if (arp_interval) {
6250 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
6251 miimon, arp_interval);
6252 arp_interval = 0;
6253 }
6254
6255 if ((updelay % miimon) != 0) {
6256 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
6257 updelay, miimon, (updelay / miimon) * miimon);
6258 }
6259
6260 updelay /= miimon;
6261
6262 if ((downdelay % miimon) != 0) {
6263 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
6264 downdelay, miimon,
6265 (downdelay / miimon) * miimon);
6266 }
6267
6268 downdelay /= miimon;
6269 }
6270
6271 if (arp_interval < 0) {
6272 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
6273 arp_interval, INT_MAX);
6274 arp_interval = 0;
6275 }
6276
6277 for (arp_ip_count = 0, i = 0;
6278 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
6279 __be32 ip;
6280
6281 /* not a complete check, but good enough to catch mistakes */
6282 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
6283 !bond_is_ip_target_ok(ip)) {
6284 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
6285 arp_ip_target[i]);
6286 arp_interval = 0;
6287 } else {
6288 if (bond_get_targets_ip(arp_target, ip) == -1)
6289 arp_target[arp_ip_count++] = ip;
6290 else
6291 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
6292 &ip);
6293 }
6294 }
6295
6296 if (arp_interval && !arp_ip_count) {
6297 /* don't allow arping if no arp_ip_target given... */
6298 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
6299 arp_interval);
6300 arp_interval = 0;
6301 }
6302
6303 if (arp_validate) {
6304 if (!arp_interval) {
6305 pr_err("arp_validate requires arp_interval\n");
6306 return -EINVAL;
6307 }
6308
6309 bond_opt_initstr(&newval, arp_validate);
6310 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
6311 &newval);
6312 if (!valptr) {
6313 pr_err("Error: invalid arp_validate \"%s\"\n",
6314 arp_validate);
6315 return -EINVAL;
6316 }
6317 arp_validate_value = valptr->value;
6318 } else {
6319 arp_validate_value = 0;
6320 }
6321
6322 if (arp_all_targets) {
6323 bond_opt_initstr(&newval, arp_all_targets);
6324 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
6325 &newval);
6326 if (!valptr) {
6327 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
6328 arp_all_targets);
6329 arp_all_targets_value = 0;
6330 } else {
6331 arp_all_targets_value = valptr->value;
6332 }
6333 }
6334
6335 if (miimon) {
6336 pr_info("MII link monitoring set to %d ms\n", miimon);
6337 } else if (arp_interval) {
6338 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
6339 arp_validate_value);
6340 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
6341 arp_interval, valptr->string, arp_ip_count);
6342
6343 for (i = 0; i < arp_ip_count; i++)
6344 pr_cont(" %s", arp_ip_target[i]);
6345
6346 pr_cont("\n");
6347
6348 } else if (max_bonds) {
6349 /* miimon and arp_interval not set, we need one so things
6350 * work as expected, see bonding.txt for details
6351 */
6352 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");
6353 }
6354
6355 if (primary && !bond_mode_uses_primary(bond_mode)) {
6356 /* currently, using a primary only makes sense
6357 * in active backup, TLB or ALB modes
6358 */
6359 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
6360 primary, bond_mode_name(bond_mode));
6361 primary = NULL;
6362 }
6363
6364 if (primary && primary_reselect) {
6365 bond_opt_initstr(&newval, primary_reselect);
6366 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
6367 &newval);
6368 if (!valptr) {
6369 pr_err("Error: Invalid primary_reselect \"%s\"\n",
6370 primary_reselect);
6371 return -EINVAL;
6372 }
6373 primary_reselect_value = valptr->value;
6374 } else {
6375 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
6376 }
6377
6378 if (fail_over_mac) {
6379 bond_opt_initstr(&newval, fail_over_mac);
6380 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
6381 &newval);
6382 if (!valptr) {
6383 pr_err("Error: invalid fail_over_mac \"%s\"\n",
6384 fail_over_mac);
6385 return -EINVAL;
6386 }
6387 fail_over_mac_value = valptr->value;
6388 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
6389 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
6390 } else {
6391 fail_over_mac_value = BOND_FOM_NONE;
6392 }
6393
6394 bond_opt_initstr(&newval, "default");
6395 valptr = bond_opt_parse(
6396 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
6397 &newval);
6398 if (!valptr) {
6399 pr_err("Error: No ad_actor_sys_prio default value");
6400 return -EINVAL;
6401 }
6402 ad_actor_sys_prio = valptr->value;
6403
6404 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
6405 &newval);
6406 if (!valptr) {
6407 pr_err("Error: No ad_user_port_key default value");
6408 return -EINVAL;
6409 }
6410 ad_user_port_key = valptr->value;
6411
6412 bond_opt_initstr(&newval, "default");
6413 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
6414 if (!valptr) {
6415 pr_err("Error: No tlb_dynamic_lb default value");
6416 return -EINVAL;
6417 }
6418 tlb_dynamic_lb = valptr->value;
6419
6420 if (lp_interval == 0) {
6421 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
6422 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
6423 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
6424 }
6425
6426 /* fill params struct with the proper values */
6427 params->mode = bond_mode;
6428 params->xmit_policy = xmit_hashtype;
6429 params->miimon = miimon;
6430 params->num_peer_notif = num_peer_notif;
6431 params->arp_interval = arp_interval;
6432 params->arp_validate = arp_validate_value;
6433 params->arp_all_targets = arp_all_targets_value;
6434 params->missed_max = 2;
6435 params->updelay = updelay;
6436 params->downdelay = downdelay;
6437 params->peer_notif_delay = 0;
6438 params->use_carrier = use_carrier;
6439 params->lacp_active = 1;
6440 params->lacp_fast = lacp_fast;
6441 params->primary[0] = 0;
6442 params->primary_reselect = primary_reselect_value;
6443 params->fail_over_mac = fail_over_mac_value;
6444 params->tx_queues = tx_queues;
6445 params->all_slaves_active = all_slaves_active;
6446 params->resend_igmp = resend_igmp;
6447 params->min_links = min_links;
6448 params->lp_interval = lp_interval;
6449 params->packets_per_slave = packets_per_slave;
6450 params->tlb_dynamic_lb = tlb_dynamic_lb;
6451 params->ad_actor_sys_prio = ad_actor_sys_prio;
6452 eth_zero_addr(params->ad_actor_system);
6453 params->ad_user_port_key = ad_user_port_key;
6454 params->coupled_control = 1;
6455 if (packets_per_slave > 0) {
6456 params->reciprocal_packets_per_slave =
6457 reciprocal_value(packets_per_slave);
6458 } else {
6459 /* reciprocal_packets_per_slave is unused if
6460 * packets_per_slave is 0 or 1, just initialize it
6461 */
6462 params->reciprocal_packets_per_slave =
6463 (struct reciprocal_value) { 0 };
6464 }
6465
6466 if (primary)
6467 strscpy_pad(params->primary, primary, sizeof(params->primary));
6468
6469 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
6470#if IS_ENABLED(CONFIG_IPV6)
6471 memset(params->ns_targets, 0, sizeof(struct in6_addr) * BOND_MAX_NS_TARGETS);
6472#endif
6473
6474 return 0;
6475}
6476
6477/* Called from registration process */
6478static int bond_init(struct net_device *bond_dev)
6479{
6480 struct bonding *bond = netdev_priv(bond_dev);
6481 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
6482
6483 netdev_dbg(bond_dev, "Begin bond_init\n");
6484
6485 bond->wq = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM,
6486 bond_dev->name);
6487 if (!bond->wq)
6488 return -ENOMEM;
6489
6490 bond->notifier_ctx = false;
6491
6492 spin_lock_init(&bond->stats_lock);
6493 netdev_lockdep_set_classes(bond_dev);
6494
6495 list_add_tail_rcu(&bond->bond_list, &bn->dev_list);
6496
6497 bond_prepare_sysfs_group(bond);
6498
6499 bond_debug_register(bond);
6500
6501 /* Ensure valid dev_addr */
6502 if (is_zero_ether_addr(bond_dev->dev_addr) &&
6503 bond_dev->addr_assign_type == NET_ADDR_PERM)
6504 eth_hw_addr_random(bond_dev);
6505
6506 return 0;
6507}
6508
6509unsigned int bond_get_num_tx_queues(void)
6510{
6511 return tx_queues;
6512}
6513
6514/* Create a new bond based on the specified name and bonding parameters.
6515 * If name is NULL, obtain a suitable "bond%d" name for us.
6516 * Caller must NOT hold rtnl_lock; we need to release it here before we
6517 * set up our sysfs entries.
6518 */
6519int bond_create(struct net *net, const char *name)
6520{
6521 struct net_device *bond_dev;
6522 struct bonding *bond;
6523 int res = -ENOMEM;
6524
6525 rtnl_lock();
6526
6527 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
6528 name ? name : "bond%d", NET_NAME_UNKNOWN,
6529 bond_setup, tx_queues);
6530 if (!bond_dev)
6531 goto out;
6532
6533 bond = netdev_priv(bond_dev);
6534 dev_net_set(bond_dev, net);
6535 bond_dev->rtnl_link_ops = &bond_link_ops;
6536
6537 res = register_netdevice(bond_dev);
6538 if (res < 0) {
6539 free_netdev(bond_dev);
6540 goto out;
6541 }
6542
6543 netif_carrier_off(bond_dev);
6544
6545 bond_work_init_all(bond);
6546
6547out:
6548 rtnl_unlock();
6549 return res;
6550}
6551
6552static int __net_init bond_net_init(struct net *net)
6553{
6554 struct bond_net *bn = net_generic(net, bond_net_id);
6555
6556 bn->net = net;
6557 INIT_LIST_HEAD(&bn->dev_list);
6558
6559 bond_create_proc_dir(bn);
6560 bond_create_sysfs(bn);
6561
6562 return 0;
6563}
6564
6565/* According to commit 69b0216ac255 ("bonding: fix bonding_masters
6566 * race condition in bond unloading") we need to remove sysfs files
6567 * before we remove our devices (done later in bond_net_exit_batch_rtnl())
6568 */
6569static void __net_exit bond_net_pre_exit(struct net *net)
6570{
6571 struct bond_net *bn = net_generic(net, bond_net_id);
6572
6573 bond_destroy_sysfs(bn);
6574}
6575
6576static void __net_exit bond_net_exit_batch_rtnl(struct list_head *net_list,
6577 struct list_head *dev_kill_list)
6578{
6579 struct bond_net *bn;
6580 struct net *net;
6581
6582 /* Kill off any bonds created after unregistering bond rtnl ops */
6583 list_for_each_entry(net, net_list, exit_list) {
6584 struct bonding *bond, *tmp_bond;
6585
6586 bn = net_generic(net, bond_net_id);
6587 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
6588 unregister_netdevice_queue(bond->dev, dev_kill_list);
6589 }
6590}
6591
6592/* According to commit 23fa5c2caae0 ("bonding: destroy proc directory
6593 * only after all bonds are gone") bond_destroy_proc_dir() is called
6594 * after bond_net_exit_batch_rtnl() has completed.
6595 */
6596static void __net_exit bond_net_exit_batch(struct list_head *net_list)
6597{
6598 struct bond_net *bn;
6599 struct net *net;
6600
6601 list_for_each_entry(net, net_list, exit_list) {
6602 bn = net_generic(net, bond_net_id);
6603 bond_destroy_proc_dir(bn);
6604 }
6605}
6606
6607static struct pernet_operations bond_net_ops = {
6608 .init = bond_net_init,
6609 .pre_exit = bond_net_pre_exit,
6610 .exit_batch_rtnl = bond_net_exit_batch_rtnl,
6611 .exit_batch = bond_net_exit_batch,
6612 .id = &bond_net_id,
6613 .size = sizeof(struct bond_net),
6614};
6615
6616static int __init bonding_init(void)
6617{
6618 int i;
6619 int res;
6620
6621 res = bond_check_params(&bonding_defaults);
6622 if (res)
6623 goto out;
6624
6625 bond_create_debugfs();
6626
6627 res = register_pernet_subsys(&bond_net_ops);
6628 if (res)
6629 goto err_net_ops;
6630
6631 res = bond_netlink_init();
6632 if (res)
6633 goto err_link;
6634
6635 for (i = 0; i < max_bonds; i++) {
6636 res = bond_create(&init_net, NULL);
6637 if (res)
6638 goto err;
6639 }
6640
6641 skb_flow_dissector_init(&flow_keys_bonding,
6642 flow_keys_bonding_keys,
6643 ARRAY_SIZE(flow_keys_bonding_keys));
6644
6645 register_netdevice_notifier(&bond_netdev_notifier);
6646out:
6647 return res;
6648err:
6649 bond_netlink_fini();
6650err_link:
6651 unregister_pernet_subsys(&bond_net_ops);
6652err_net_ops:
6653 bond_destroy_debugfs();
6654 goto out;
6655
6656}
6657
6658static void __exit bonding_exit(void)
6659{
6660 unregister_netdevice_notifier(&bond_netdev_notifier);
6661
6662 bond_netlink_fini();
6663 unregister_pernet_subsys(&bond_net_ops);
6664
6665 bond_destroy_debugfs();
6666
6667#ifdef CONFIG_NET_POLL_CONTROLLER
6668 /* Make sure we don't have an imbalance on our netpoll blocking */
6669 WARN_ON(atomic_read(&netpoll_block_tx));
6670#endif
6671}
6672
6673module_init(bonding_init);
6674module_exit(bonding_exit);
6675MODULE_LICENSE("GPL");
6676MODULE_DESCRIPTION(DRV_DESCRIPTION);
6677MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");