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bonding: disable arp and enable mii monitoring when bond change to no uses arp mode
[deliverable/linux.git] / drivers / net / bonding / bond_main.c
1 /*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
32 */
33
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
43 #include <linux/in.h>
44 #include <net/ip.h>
45 #include <linux/ip.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
56 #include <linux/io.h>
57 #include <asm/dma.h>
58 #include <linux/uaccess.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/inetdevice.h>
62 #include <linux/igmp.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
65 #include <net/sock.h>
66 #include <linux/rtnetlink.h>
67 #include <linux/smp.h>
68 #include <linux/if_ether.h>
69 #include <net/arp.h>
70 #include <linux/mii.h>
71 #include <linux/ethtool.h>
72 #include <linux/if_vlan.h>
73 #include <linux/if_bonding.h>
74 #include <linux/jiffies.h>
75 #include <linux/preempt.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
79 #include <net/pkt_sched.h>
80 #include <linux/rculist.h>
81 #include <net/flow_keys.h>
82 #include <linux/reciprocal_div.h>
83 #include "bonding.h"
84 #include "bond_3ad.h"
85 #include "bond_alb.h"
86
87 /*---------------------------- Module parameters ----------------------------*/
88
89 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
90 #define BOND_LINK_MON_INTERV 0
91 #define BOND_LINK_ARP_INTERV 0
92
93 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
94 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
95 static int num_peer_notif = 1;
96 static int miimon = BOND_LINK_MON_INTERV;
97 static int updelay;
98 static int downdelay;
99 static int use_carrier = 1;
100 static char *mode;
101 static char *primary;
102 static char *primary_reselect;
103 static char *lacp_rate;
104 static int min_links;
105 static char *ad_select;
106 static char *xmit_hash_policy;
107 static int arp_interval = BOND_LINK_ARP_INTERV;
108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
109 static char *arp_validate;
110 static char *arp_all_targets;
111 static char *fail_over_mac;
112 static int all_slaves_active;
113 static struct bond_params bonding_defaults;
114 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
115 static int packets_per_slave = 1;
116
117 module_param(max_bonds, int, 0);
118 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
119 module_param(tx_queues, int, 0);
120 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
121 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
122 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
123 "failover event (alias of num_unsol_na)");
124 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
125 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
126 "failover event (alias of num_grat_arp)");
127 module_param(miimon, int, 0);
128 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
129 module_param(updelay, int, 0);
130 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
131 module_param(downdelay, int, 0);
132 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
133 "in milliseconds");
134 module_param(use_carrier, int, 0);
135 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
136 "0 for off, 1 for on (default)");
137 module_param(mode, charp, 0);
138 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
139 "1 for active-backup, 2 for balance-xor, "
140 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
141 "6 for balance-alb");
142 module_param(primary, charp, 0);
143 MODULE_PARM_DESC(primary, "Primary network device to use");
144 module_param(primary_reselect, charp, 0);
145 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
146 "once it comes up; "
147 "0 for always (default), "
148 "1 for only if speed of primary is "
149 "better, "
150 "2 for only on active slave "
151 "failure");
152 module_param(lacp_rate, charp, 0);
153 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
154 "0 for slow, 1 for fast");
155 module_param(ad_select, charp, 0);
156 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
157 "0 for stable (default), 1 for bandwidth, "
158 "2 for count");
159 module_param(min_links, int, 0);
160 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
161
162 module_param(xmit_hash_policy, charp, 0);
163 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
164 "0 for layer 2 (default), 1 for layer 3+4, "
165 "2 for layer 2+3, 3 for encap layer 2+3, "
166 "4 for encap layer 3+4");
167 module_param(arp_interval, int, 0);
168 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
169 module_param_array(arp_ip_target, charp, NULL, 0);
170 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
171 module_param(arp_validate, charp, 0);
172 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
173 "0 for none (default), 1 for active, "
174 "2 for backup, 3 for all");
175 module_param(arp_all_targets, charp, 0);
176 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
177 module_param(fail_over_mac, charp, 0);
178 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
179 "the same MAC; 0 for none (default), "
180 "1 for active, 2 for follow");
181 module_param(all_slaves_active, int, 0);
182 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
183 "by setting active flag for all slaves; "
184 "0 for never (default), 1 for always.");
185 module_param(resend_igmp, int, 0);
186 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
187 "link failure");
188 module_param(packets_per_slave, int, 0);
189 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
190 "mode; 0 for a random slave, 1 packet per "
191 "slave (default), >1 packets per slave.");
192
193 /*----------------------------- Global variables ----------------------------*/
194
195 #ifdef CONFIG_NET_POLL_CONTROLLER
196 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
197 #endif
198
199 int bond_net_id __read_mostly;
200
201 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
202 static int arp_ip_count;
203 static int bond_mode = BOND_MODE_ROUNDROBIN;
204 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
205 static int lacp_fast;
206
207 const struct bond_parm_tbl bond_lacp_tbl[] = {
208 { "slow", AD_LACP_SLOW},
209 { "fast", AD_LACP_FAST},
210 { NULL, -1},
211 };
212
213 const struct bond_parm_tbl bond_mode_tbl[] = {
214 { "balance-rr", BOND_MODE_ROUNDROBIN},
215 { "active-backup", BOND_MODE_ACTIVEBACKUP},
216 { "balance-xor", BOND_MODE_XOR},
217 { "broadcast", BOND_MODE_BROADCAST},
218 { "802.3ad", BOND_MODE_8023AD},
219 { "balance-tlb", BOND_MODE_TLB},
220 { "balance-alb", BOND_MODE_ALB},
221 { NULL, -1},
222 };
223
224 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
225 { "layer2", BOND_XMIT_POLICY_LAYER2},
226 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
227 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
228 { "encap2+3", BOND_XMIT_POLICY_ENCAP23},
229 { "encap3+4", BOND_XMIT_POLICY_ENCAP34},
230 { NULL, -1},
231 };
232
233 const struct bond_parm_tbl arp_all_targets_tbl[] = {
234 { "any", BOND_ARP_TARGETS_ANY},
235 { "all", BOND_ARP_TARGETS_ALL},
236 { NULL, -1},
237 };
238
239 const struct bond_parm_tbl arp_validate_tbl[] = {
240 { "none", BOND_ARP_VALIDATE_NONE},
241 { "active", BOND_ARP_VALIDATE_ACTIVE},
242 { "backup", BOND_ARP_VALIDATE_BACKUP},
243 { "all", BOND_ARP_VALIDATE_ALL},
244 { NULL, -1},
245 };
246
247 const struct bond_parm_tbl fail_over_mac_tbl[] = {
248 { "none", BOND_FOM_NONE},
249 { "active", BOND_FOM_ACTIVE},
250 { "follow", BOND_FOM_FOLLOW},
251 { NULL, -1},
252 };
253
254 const struct bond_parm_tbl pri_reselect_tbl[] = {
255 { "always", BOND_PRI_RESELECT_ALWAYS},
256 { "better", BOND_PRI_RESELECT_BETTER},
257 { "failure", BOND_PRI_RESELECT_FAILURE},
258 { NULL, -1},
259 };
260
261 struct bond_parm_tbl ad_select_tbl[] = {
262 { "stable", BOND_AD_STABLE},
263 { "bandwidth", BOND_AD_BANDWIDTH},
264 { "count", BOND_AD_COUNT},
265 { NULL, -1},
266 };
267
268 /*-------------------------- Forward declarations ---------------------------*/
269
270 static int bond_init(struct net_device *bond_dev);
271 static void bond_uninit(struct net_device *bond_dev);
272
273 /*---------------------------- General routines -----------------------------*/
274
275 const char *bond_mode_name(int mode)
276 {
277 static const char *names[] = {
278 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
279 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
280 [BOND_MODE_XOR] = "load balancing (xor)",
281 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
282 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
283 [BOND_MODE_TLB] = "transmit load balancing",
284 [BOND_MODE_ALB] = "adaptive load balancing",
285 };
286
287 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
288 return "unknown";
289
290 return names[mode];
291 }
292
293 /*---------------------------------- VLAN -----------------------------------*/
294
295 /**
296 * bond_dev_queue_xmit - Prepare skb for xmit.
297 *
298 * @bond: bond device that got this skb for tx.
299 * @skb: hw accel VLAN tagged skb to transmit
300 * @slave_dev: slave that is supposed to xmit this skbuff
301 */
302 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
303 struct net_device *slave_dev)
304 {
305 skb->dev = slave_dev;
306
307 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
308 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
309 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
310
311 if (unlikely(netpoll_tx_running(bond->dev)))
312 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
313 else
314 dev_queue_xmit(skb);
315
316 return 0;
317 }
318
319 /*
320 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
321 * We don't protect the slave list iteration with a lock because:
322 * a. This operation is performed in IOCTL context,
323 * b. The operation is protected by the RTNL semaphore in the 8021q code,
324 * c. Holding a lock with BH disabled while directly calling a base driver
325 * entry point is generally a BAD idea.
326 *
327 * The design of synchronization/protection for this operation in the 8021q
328 * module is good for one or more VLAN devices over a single physical device
329 * and cannot be extended for a teaming solution like bonding, so there is a
330 * potential race condition here where a net device from the vlan group might
331 * be referenced (either by a base driver or the 8021q code) while it is being
332 * removed from the system. However, it turns out we're not making matters
333 * worse, and if it works for regular VLAN usage it will work here too.
334 */
335
336 /**
337 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
338 * @bond_dev: bonding net device that got called
339 * @vid: vlan id being added
340 */
341 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
342 __be16 proto, u16 vid)
343 {
344 struct bonding *bond = netdev_priv(bond_dev);
345 struct slave *slave, *rollback_slave;
346 struct list_head *iter;
347 int res;
348
349 bond_for_each_slave(bond, slave, iter) {
350 res = vlan_vid_add(slave->dev, proto, vid);
351 if (res)
352 goto unwind;
353 }
354
355 return 0;
356
357 unwind:
358 /* unwind to the slave that failed */
359 bond_for_each_slave(bond, rollback_slave, iter) {
360 if (rollback_slave == slave)
361 break;
362
363 vlan_vid_del(rollback_slave->dev, proto, vid);
364 }
365
366 return res;
367 }
368
369 /**
370 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
371 * @bond_dev: bonding net device that got called
372 * @vid: vlan id being removed
373 */
374 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
375 __be16 proto, u16 vid)
376 {
377 struct bonding *bond = netdev_priv(bond_dev);
378 struct list_head *iter;
379 struct slave *slave;
380
381 bond_for_each_slave(bond, slave, iter)
382 vlan_vid_del(slave->dev, proto, vid);
383
384 if (bond_is_lb(bond))
385 bond_alb_clear_vlan(bond, vid);
386
387 return 0;
388 }
389
390 /*------------------------------- Link status -------------------------------*/
391
392 /*
393 * Set the carrier state for the master according to the state of its
394 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
395 * do special 802.3ad magic.
396 *
397 * Returns zero if carrier state does not change, nonzero if it does.
398 */
399 static int bond_set_carrier(struct bonding *bond)
400 {
401 struct list_head *iter;
402 struct slave *slave;
403
404 if (!bond_has_slaves(bond))
405 goto down;
406
407 if (bond->params.mode == BOND_MODE_8023AD)
408 return bond_3ad_set_carrier(bond);
409
410 bond_for_each_slave(bond, slave, iter) {
411 if (slave->link == BOND_LINK_UP) {
412 if (!netif_carrier_ok(bond->dev)) {
413 netif_carrier_on(bond->dev);
414 return 1;
415 }
416 return 0;
417 }
418 }
419
420 down:
421 if (netif_carrier_ok(bond->dev)) {
422 netif_carrier_off(bond->dev);
423 return 1;
424 }
425 return 0;
426 }
427
428 /*
429 * Get link speed and duplex from the slave's base driver
430 * using ethtool. If for some reason the call fails or the
431 * values are invalid, set speed and duplex to -1,
432 * and return.
433 */
434 static void bond_update_speed_duplex(struct slave *slave)
435 {
436 struct net_device *slave_dev = slave->dev;
437 struct ethtool_cmd ecmd;
438 u32 slave_speed;
439 int res;
440
441 slave->speed = SPEED_UNKNOWN;
442 slave->duplex = DUPLEX_UNKNOWN;
443
444 res = __ethtool_get_settings(slave_dev, &ecmd);
445 if (res < 0)
446 return;
447
448 slave_speed = ethtool_cmd_speed(&ecmd);
449 if (slave_speed == 0 || slave_speed == ((__u32) -1))
450 return;
451
452 switch (ecmd.duplex) {
453 case DUPLEX_FULL:
454 case DUPLEX_HALF:
455 break;
456 default:
457 return;
458 }
459
460 slave->speed = slave_speed;
461 slave->duplex = ecmd.duplex;
462
463 return;
464 }
465
466 /*
467 * if <dev> supports MII link status reporting, check its link status.
468 *
469 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
470 * depending upon the setting of the use_carrier parameter.
471 *
472 * Return either BMSR_LSTATUS, meaning that the link is up (or we
473 * can't tell and just pretend it is), or 0, meaning that the link is
474 * down.
475 *
476 * If reporting is non-zero, instead of faking link up, return -1 if
477 * both ETHTOOL and MII ioctls fail (meaning the device does not
478 * support them). If use_carrier is set, return whatever it says.
479 * It'd be nice if there was a good way to tell if a driver supports
480 * netif_carrier, but there really isn't.
481 */
482 static int bond_check_dev_link(struct bonding *bond,
483 struct net_device *slave_dev, int reporting)
484 {
485 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
486 int (*ioctl)(struct net_device *, struct ifreq *, int);
487 struct ifreq ifr;
488 struct mii_ioctl_data *mii;
489
490 if (!reporting && !netif_running(slave_dev))
491 return 0;
492
493 if (bond->params.use_carrier)
494 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
495
496 /* Try to get link status using Ethtool first. */
497 if (slave_dev->ethtool_ops->get_link)
498 return slave_dev->ethtool_ops->get_link(slave_dev) ?
499 BMSR_LSTATUS : 0;
500
501 /* Ethtool can't be used, fallback to MII ioctls. */
502 ioctl = slave_ops->ndo_do_ioctl;
503 if (ioctl) {
504 /* TODO: set pointer to correct ioctl on a per team member */
505 /* bases to make this more efficient. that is, once */
506 /* we determine the correct ioctl, we will always */
507 /* call it and not the others for that team */
508 /* member. */
509
510 /*
511 * We cannot assume that SIOCGMIIPHY will also read a
512 * register; not all network drivers (e.g., e100)
513 * support that.
514 */
515
516 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
517 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
518 mii = if_mii(&ifr);
519 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
520 mii->reg_num = MII_BMSR;
521 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
522 return mii->val_out & BMSR_LSTATUS;
523 }
524 }
525
526 /*
527 * If reporting, report that either there's no dev->do_ioctl,
528 * or both SIOCGMIIREG and get_link failed (meaning that we
529 * cannot report link status). If not reporting, pretend
530 * we're ok.
531 */
532 return reporting ? -1 : BMSR_LSTATUS;
533 }
534
535 /*----------------------------- Multicast list ------------------------------*/
536
537 /*
538 * Push the promiscuity flag down to appropriate slaves
539 */
540 static int bond_set_promiscuity(struct bonding *bond, int inc)
541 {
542 struct list_head *iter;
543 int err = 0;
544
545 if (USES_PRIMARY(bond->params.mode)) {
546 /* write lock already acquired */
547 if (bond->curr_active_slave) {
548 err = dev_set_promiscuity(bond->curr_active_slave->dev,
549 inc);
550 }
551 } else {
552 struct slave *slave;
553
554 bond_for_each_slave(bond, slave, iter) {
555 err = dev_set_promiscuity(slave->dev, inc);
556 if (err)
557 return err;
558 }
559 }
560 return err;
561 }
562
563 /*
564 * Push the allmulti flag down to all slaves
565 */
566 static int bond_set_allmulti(struct bonding *bond, int inc)
567 {
568 struct list_head *iter;
569 int err = 0;
570
571 if (USES_PRIMARY(bond->params.mode)) {
572 /* write lock already acquired */
573 if (bond->curr_active_slave) {
574 err = dev_set_allmulti(bond->curr_active_slave->dev,
575 inc);
576 }
577 } else {
578 struct slave *slave;
579
580 bond_for_each_slave(bond, slave, iter) {
581 err = dev_set_allmulti(slave->dev, inc);
582 if (err)
583 return err;
584 }
585 }
586 return err;
587 }
588
589 /*
590 * Retrieve the list of registered multicast addresses for the bonding
591 * device and retransmit an IGMP JOIN request to the current active
592 * slave.
593 */
594 static void bond_resend_igmp_join_requests(struct bonding *bond)
595 {
596 if (!rtnl_trylock()) {
597 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
598 return;
599 }
600 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
601 rtnl_unlock();
602
603 /* We use curr_slave_lock to protect against concurrent access to
604 * igmp_retrans from multiple running instances of this function and
605 * bond_change_active_slave
606 */
607 write_lock_bh(&bond->curr_slave_lock);
608 if (bond->igmp_retrans > 1) {
609 bond->igmp_retrans--;
610 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
611 }
612 write_unlock_bh(&bond->curr_slave_lock);
613 }
614
615 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
616 {
617 struct bonding *bond = container_of(work, struct bonding,
618 mcast_work.work);
619
620 bond_resend_igmp_join_requests(bond);
621 }
622
623 /* Flush bond's hardware addresses from slave
624 */
625 static void bond_hw_addr_flush(struct net_device *bond_dev,
626 struct net_device *slave_dev)
627 {
628 struct bonding *bond = netdev_priv(bond_dev);
629
630 dev_uc_unsync(slave_dev, bond_dev);
631 dev_mc_unsync(slave_dev, bond_dev);
632
633 if (bond->params.mode == BOND_MODE_8023AD) {
634 /* del lacpdu mc addr from mc list */
635 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
636
637 dev_mc_del(slave_dev, lacpdu_multicast);
638 }
639 }
640
641 /*--------------------------- Active slave change ---------------------------*/
642
643 /* Update the hardware address list and promisc/allmulti for the new and
644 * old active slaves (if any). Modes that are !USES_PRIMARY keep all
645 * slaves up date at all times; only the USES_PRIMARY modes need to call
646 * this function to swap these settings during a failover.
647 */
648 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
649 struct slave *old_active)
650 {
651 ASSERT_RTNL();
652
653 if (old_active) {
654 if (bond->dev->flags & IFF_PROMISC)
655 dev_set_promiscuity(old_active->dev, -1);
656
657 if (bond->dev->flags & IFF_ALLMULTI)
658 dev_set_allmulti(old_active->dev, -1);
659
660 bond_hw_addr_flush(bond->dev, old_active->dev);
661 }
662
663 if (new_active) {
664 /* FIXME: Signal errors upstream. */
665 if (bond->dev->flags & IFF_PROMISC)
666 dev_set_promiscuity(new_active->dev, 1);
667
668 if (bond->dev->flags & IFF_ALLMULTI)
669 dev_set_allmulti(new_active->dev, 1);
670
671 netif_addr_lock_bh(bond->dev);
672 dev_uc_sync(new_active->dev, bond->dev);
673 dev_mc_sync(new_active->dev, bond->dev);
674 netif_addr_unlock_bh(bond->dev);
675 }
676 }
677
678 /**
679 * bond_set_dev_addr - clone slave's address to bond
680 * @bond_dev: bond net device
681 * @slave_dev: slave net device
682 *
683 * Should be called with RTNL held.
684 */
685 static void bond_set_dev_addr(struct net_device *bond_dev,
686 struct net_device *slave_dev)
687 {
688 pr_debug("bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
689 bond_dev, slave_dev, slave_dev->addr_len);
690 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
691 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
692 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
693 }
694
695 /*
696 * bond_do_fail_over_mac
697 *
698 * Perform special MAC address swapping for fail_over_mac settings
699 *
700 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
701 */
702 static void bond_do_fail_over_mac(struct bonding *bond,
703 struct slave *new_active,
704 struct slave *old_active)
705 __releases(&bond->curr_slave_lock)
706 __releases(&bond->lock)
707 __acquires(&bond->lock)
708 __acquires(&bond->curr_slave_lock)
709 {
710 u8 tmp_mac[ETH_ALEN];
711 struct sockaddr saddr;
712 int rv;
713
714 switch (bond->params.fail_over_mac) {
715 case BOND_FOM_ACTIVE:
716 if (new_active) {
717 write_unlock_bh(&bond->curr_slave_lock);
718 read_unlock(&bond->lock);
719 bond_set_dev_addr(bond->dev, new_active->dev);
720 read_lock(&bond->lock);
721 write_lock_bh(&bond->curr_slave_lock);
722 }
723 break;
724 case BOND_FOM_FOLLOW:
725 /*
726 * if new_active && old_active, swap them
727 * if just old_active, do nothing (going to no active slave)
728 * if just new_active, set new_active to bond's MAC
729 */
730 if (!new_active)
731 return;
732
733 write_unlock_bh(&bond->curr_slave_lock);
734 read_unlock(&bond->lock);
735
736 if (old_active) {
737 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
738 memcpy(saddr.sa_data, old_active->dev->dev_addr,
739 ETH_ALEN);
740 saddr.sa_family = new_active->dev->type;
741 } else {
742 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
743 saddr.sa_family = bond->dev->type;
744 }
745
746 rv = dev_set_mac_address(new_active->dev, &saddr);
747 if (rv) {
748 pr_err("%s: Error %d setting MAC of slave %s\n",
749 bond->dev->name, -rv, new_active->dev->name);
750 goto out;
751 }
752
753 if (!old_active)
754 goto out;
755
756 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
757 saddr.sa_family = old_active->dev->type;
758
759 rv = dev_set_mac_address(old_active->dev, &saddr);
760 if (rv)
761 pr_err("%s: Error %d setting MAC of slave %s\n",
762 bond->dev->name, -rv, new_active->dev->name);
763 out:
764 read_lock(&bond->lock);
765 write_lock_bh(&bond->curr_slave_lock);
766 break;
767 default:
768 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
769 bond->dev->name, bond->params.fail_over_mac);
770 break;
771 }
772
773 }
774
775 static bool bond_should_change_active(struct bonding *bond)
776 {
777 struct slave *prim = bond->primary_slave;
778 struct slave *curr = bond->curr_active_slave;
779
780 if (!prim || !curr || curr->link != BOND_LINK_UP)
781 return true;
782 if (bond->force_primary) {
783 bond->force_primary = false;
784 return true;
785 }
786 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
787 (prim->speed < curr->speed ||
788 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
789 return false;
790 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
791 return false;
792 return true;
793 }
794
795 /**
796 * find_best_interface - select the best available slave to be the active one
797 * @bond: our bonding struct
798 */
799 static struct slave *bond_find_best_slave(struct bonding *bond)
800 {
801 struct slave *slave, *bestslave = NULL;
802 struct list_head *iter;
803 int mintime = bond->params.updelay;
804
805 if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
806 bond_should_change_active(bond))
807 return bond->primary_slave;
808
809 bond_for_each_slave(bond, slave, iter) {
810 if (slave->link == BOND_LINK_UP)
811 return slave;
812 if (slave->link == BOND_LINK_BACK && IS_UP(slave->dev) &&
813 slave->delay < mintime) {
814 mintime = slave->delay;
815 bestslave = slave;
816 }
817 }
818
819 return bestslave;
820 }
821
822 static bool bond_should_notify_peers(struct bonding *bond)
823 {
824 struct slave *slave = bond->curr_active_slave;
825
826 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
827 bond->dev->name, slave ? slave->dev->name : "NULL");
828
829 if (!slave || !bond->send_peer_notif ||
830 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
831 return false;
832
833 return true;
834 }
835
836 /**
837 * change_active_interface - change the active slave into the specified one
838 * @bond: our bonding struct
839 * @new: the new slave to make the active one
840 *
841 * Set the new slave to the bond's settings and unset them on the old
842 * curr_active_slave.
843 * Setting include flags, mc-list, promiscuity, allmulti, etc.
844 *
845 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
846 * because it is apparently the best available slave we have, even though its
847 * updelay hasn't timed out yet.
848 *
849 * If new_active is not NULL, caller must hold bond->lock for read and
850 * curr_slave_lock for write_bh.
851 */
852 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
853 {
854 struct slave *old_active = bond->curr_active_slave;
855
856 if (old_active == new_active)
857 return;
858
859 if (new_active) {
860 new_active->jiffies = jiffies;
861
862 if (new_active->link == BOND_LINK_BACK) {
863 if (USES_PRIMARY(bond->params.mode)) {
864 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
865 bond->dev->name, new_active->dev->name,
866 (bond->params.updelay - new_active->delay) * bond->params.miimon);
867 }
868
869 new_active->delay = 0;
870 new_active->link = BOND_LINK_UP;
871
872 if (bond->params.mode == BOND_MODE_8023AD)
873 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
874
875 if (bond_is_lb(bond))
876 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
877 } else {
878 if (USES_PRIMARY(bond->params.mode)) {
879 pr_info("%s: making interface %s the new active one.\n",
880 bond->dev->name, new_active->dev->name);
881 }
882 }
883 }
884
885 if (USES_PRIMARY(bond->params.mode))
886 bond_hw_addr_swap(bond, new_active, old_active);
887
888 if (bond_is_lb(bond)) {
889 bond_alb_handle_active_change(bond, new_active);
890 if (old_active)
891 bond_set_slave_inactive_flags(old_active);
892 if (new_active)
893 bond_set_slave_active_flags(new_active);
894 } else {
895 rcu_assign_pointer(bond->curr_active_slave, new_active);
896 }
897
898 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
899 if (old_active)
900 bond_set_slave_inactive_flags(old_active);
901
902 if (new_active) {
903 bool should_notify_peers = false;
904
905 bond_set_slave_active_flags(new_active);
906
907 if (bond->params.fail_over_mac)
908 bond_do_fail_over_mac(bond, new_active,
909 old_active);
910
911 if (netif_running(bond->dev)) {
912 bond->send_peer_notif =
913 bond->params.num_peer_notif;
914 should_notify_peers =
915 bond_should_notify_peers(bond);
916 }
917
918 write_unlock_bh(&bond->curr_slave_lock);
919 read_unlock(&bond->lock);
920
921 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
922 if (should_notify_peers)
923 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
924 bond->dev);
925
926 read_lock(&bond->lock);
927 write_lock_bh(&bond->curr_slave_lock);
928 }
929 }
930
931 /* resend IGMP joins since active slave has changed or
932 * all were sent on curr_active_slave.
933 * resend only if bond is brought up with the affected
934 * bonding modes and the retransmission is enabled */
935 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
936 ((USES_PRIMARY(bond->params.mode) && new_active) ||
937 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
938 bond->igmp_retrans = bond->params.resend_igmp;
939 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
940 }
941 }
942
943 /**
944 * bond_select_active_slave - select a new active slave, if needed
945 * @bond: our bonding struct
946 *
947 * This functions should be called when one of the following occurs:
948 * - The old curr_active_slave has been released or lost its link.
949 * - The primary_slave has got its link back.
950 * - A slave has got its link back and there's no old curr_active_slave.
951 *
952 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
953 */
954 void bond_select_active_slave(struct bonding *bond)
955 {
956 struct slave *best_slave;
957 int rv;
958
959 best_slave = bond_find_best_slave(bond);
960 if (best_slave != bond->curr_active_slave) {
961 bond_change_active_slave(bond, best_slave);
962 rv = bond_set_carrier(bond);
963 if (!rv)
964 return;
965
966 if (netif_carrier_ok(bond->dev)) {
967 pr_info("%s: first active interface up!\n",
968 bond->dev->name);
969 } else {
970 pr_info("%s: now running without any active interface !\n",
971 bond->dev->name);
972 }
973 }
974 }
975
976 #ifdef CONFIG_NET_POLL_CONTROLLER
977 static inline int slave_enable_netpoll(struct slave *slave)
978 {
979 struct netpoll *np;
980 int err = 0;
981
982 np = kzalloc(sizeof(*np), GFP_ATOMIC);
983 err = -ENOMEM;
984 if (!np)
985 goto out;
986
987 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
988 if (err) {
989 kfree(np);
990 goto out;
991 }
992 slave->np = np;
993 out:
994 return err;
995 }
996 static inline void slave_disable_netpoll(struct slave *slave)
997 {
998 struct netpoll *np = slave->np;
999
1000 if (!np)
1001 return;
1002
1003 slave->np = NULL;
1004 __netpoll_free_async(np);
1005 }
1006 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1007 {
1008 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1009 return false;
1010 if (!slave_dev->netdev_ops->ndo_poll_controller)
1011 return false;
1012 return true;
1013 }
1014
1015 static void bond_poll_controller(struct net_device *bond_dev)
1016 {
1017 }
1018
1019 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1020 {
1021 struct bonding *bond = netdev_priv(bond_dev);
1022 struct list_head *iter;
1023 struct slave *slave;
1024
1025 bond_for_each_slave(bond, slave, iter)
1026 if (IS_UP(slave->dev))
1027 slave_disable_netpoll(slave);
1028 }
1029
1030 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1031 {
1032 struct bonding *bond = netdev_priv(dev);
1033 struct list_head *iter;
1034 struct slave *slave;
1035 int err = 0;
1036
1037 bond_for_each_slave(bond, slave, iter) {
1038 err = slave_enable_netpoll(slave);
1039 if (err) {
1040 bond_netpoll_cleanup(dev);
1041 break;
1042 }
1043 }
1044 return err;
1045 }
1046 #else
1047 static inline int slave_enable_netpoll(struct slave *slave)
1048 {
1049 return 0;
1050 }
1051 static inline void slave_disable_netpoll(struct slave *slave)
1052 {
1053 }
1054 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1055 {
1056 }
1057 #endif
1058
1059 /*---------------------------------- IOCTL ----------------------------------*/
1060
1061 static netdev_features_t bond_fix_features(struct net_device *dev,
1062 netdev_features_t features)
1063 {
1064 struct bonding *bond = netdev_priv(dev);
1065 struct list_head *iter;
1066 netdev_features_t mask;
1067 struct slave *slave;
1068
1069 if (!bond_has_slaves(bond)) {
1070 /* Disable adding VLANs to empty bond. But why? --mq */
1071 features |= NETIF_F_VLAN_CHALLENGED;
1072 return features;
1073 }
1074
1075 mask = features;
1076 features &= ~NETIF_F_ONE_FOR_ALL;
1077 features |= NETIF_F_ALL_FOR_ALL;
1078
1079 bond_for_each_slave(bond, slave, iter) {
1080 features = netdev_increment_features(features,
1081 slave->dev->features,
1082 mask);
1083 }
1084 features = netdev_add_tso_features(features, mask);
1085
1086 return features;
1087 }
1088
1089 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1090 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1091 NETIF_F_HIGHDMA | NETIF_F_LRO)
1092
1093 static void bond_compute_features(struct bonding *bond)
1094 {
1095 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1096 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1097 struct net_device *bond_dev = bond->dev;
1098 struct list_head *iter;
1099 struct slave *slave;
1100 unsigned short max_hard_header_len = ETH_HLEN;
1101 unsigned int gso_max_size = GSO_MAX_SIZE;
1102 u16 gso_max_segs = GSO_MAX_SEGS;
1103
1104 if (!bond_has_slaves(bond))
1105 goto done;
1106
1107 bond_for_each_slave(bond, slave, iter) {
1108 vlan_features = netdev_increment_features(vlan_features,
1109 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1110
1111 dst_release_flag &= slave->dev->priv_flags;
1112 if (slave->dev->hard_header_len > max_hard_header_len)
1113 max_hard_header_len = slave->dev->hard_header_len;
1114
1115 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1116 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1117 }
1118
1119 done:
1120 bond_dev->vlan_features = vlan_features;
1121 bond_dev->hard_header_len = max_hard_header_len;
1122 bond_dev->gso_max_segs = gso_max_segs;
1123 netif_set_gso_max_size(bond_dev, gso_max_size);
1124
1125 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1126 bond_dev->priv_flags = flags | dst_release_flag;
1127
1128 netdev_change_features(bond_dev);
1129 }
1130
1131 static void bond_setup_by_slave(struct net_device *bond_dev,
1132 struct net_device *slave_dev)
1133 {
1134 bond_dev->header_ops = slave_dev->header_ops;
1135
1136 bond_dev->type = slave_dev->type;
1137 bond_dev->hard_header_len = slave_dev->hard_header_len;
1138 bond_dev->addr_len = slave_dev->addr_len;
1139
1140 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1141 slave_dev->addr_len);
1142 }
1143
1144 /* On bonding slaves other than the currently active slave, suppress
1145 * duplicates except for alb non-mcast/bcast.
1146 */
1147 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1148 struct slave *slave,
1149 struct bonding *bond)
1150 {
1151 if (bond_is_slave_inactive(slave)) {
1152 if (bond->params.mode == BOND_MODE_ALB &&
1153 skb->pkt_type != PACKET_BROADCAST &&
1154 skb->pkt_type != PACKET_MULTICAST)
1155 return false;
1156 return true;
1157 }
1158 return false;
1159 }
1160
1161 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1162 {
1163 struct sk_buff *skb = *pskb;
1164 struct slave *slave;
1165 struct bonding *bond;
1166 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1167 struct slave *);
1168 int ret = RX_HANDLER_ANOTHER;
1169
1170 skb = skb_share_check(skb, GFP_ATOMIC);
1171 if (unlikely(!skb))
1172 return RX_HANDLER_CONSUMED;
1173
1174 *pskb = skb;
1175
1176 slave = bond_slave_get_rcu(skb->dev);
1177 bond = slave->bond;
1178
1179 if (bond->params.arp_interval)
1180 slave->dev->last_rx = jiffies;
1181
1182 recv_probe = ACCESS_ONCE(bond->recv_probe);
1183 if (recv_probe) {
1184 ret = recv_probe(skb, bond, slave);
1185 if (ret == RX_HANDLER_CONSUMED) {
1186 consume_skb(skb);
1187 return ret;
1188 }
1189 }
1190
1191 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1192 return RX_HANDLER_EXACT;
1193 }
1194
1195 skb->dev = bond->dev;
1196
1197 if (bond->params.mode == BOND_MODE_ALB &&
1198 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1199 skb->pkt_type == PACKET_HOST) {
1200
1201 if (unlikely(skb_cow_head(skb,
1202 skb->data - skb_mac_header(skb)))) {
1203 kfree_skb(skb);
1204 return RX_HANDLER_CONSUMED;
1205 }
1206 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1207 }
1208
1209 return ret;
1210 }
1211
1212 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1213 struct net_device *slave_dev,
1214 struct slave *slave)
1215 {
1216 int err;
1217
1218 err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1219 if (err)
1220 return err;
1221 slave_dev->flags |= IFF_SLAVE;
1222 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1223 return 0;
1224 }
1225
1226 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1227 struct net_device *slave_dev)
1228 {
1229 netdev_upper_dev_unlink(slave_dev, bond_dev);
1230 slave_dev->flags &= ~IFF_SLAVE;
1231 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1232 }
1233
1234 /* enslave device <slave> to bond device <master> */
1235 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1236 {
1237 struct bonding *bond = netdev_priv(bond_dev);
1238 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1239 struct slave *new_slave = NULL, *prev_slave;
1240 struct sockaddr addr;
1241 int link_reporting;
1242 int res = 0, i;
1243
1244 if (!bond->params.use_carrier &&
1245 slave_dev->ethtool_ops->get_link == NULL &&
1246 slave_ops->ndo_do_ioctl == NULL) {
1247 pr_warning("%s: Warning: no link monitoring support for %s\n",
1248 bond_dev->name, slave_dev->name);
1249 }
1250
1251 /* already enslaved */
1252 if (slave_dev->flags & IFF_SLAVE) {
1253 pr_debug("Error, Device was already enslaved\n");
1254 return -EBUSY;
1255 }
1256
1257 /* vlan challenged mutual exclusion */
1258 /* no need to lock since we're protected by rtnl_lock */
1259 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1260 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1261 if (vlan_uses_dev(bond_dev)) {
1262 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1263 bond_dev->name, slave_dev->name, bond_dev->name);
1264 return -EPERM;
1265 } else {
1266 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1267 bond_dev->name, slave_dev->name,
1268 slave_dev->name, bond_dev->name);
1269 }
1270 } else {
1271 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1272 }
1273
1274 /*
1275 * Old ifenslave binaries are no longer supported. These can
1276 * be identified with moderate accuracy by the state of the slave:
1277 * the current ifenslave will set the interface down prior to
1278 * enslaving it; the old ifenslave will not.
1279 */
1280 if ((slave_dev->flags & IFF_UP)) {
1281 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1282 slave_dev->name);
1283 res = -EPERM;
1284 goto err_undo_flags;
1285 }
1286
1287 /* set bonding device ether type by slave - bonding netdevices are
1288 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1289 * there is a need to override some of the type dependent attribs/funcs.
1290 *
1291 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1292 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1293 */
1294 if (!bond_has_slaves(bond)) {
1295 if (bond_dev->type != slave_dev->type) {
1296 pr_debug("%s: change device type from %d to %d\n",
1297 bond_dev->name,
1298 bond_dev->type, slave_dev->type);
1299
1300 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1301 bond_dev);
1302 res = notifier_to_errno(res);
1303 if (res) {
1304 pr_err("%s: refused to change device type\n",
1305 bond_dev->name);
1306 res = -EBUSY;
1307 goto err_undo_flags;
1308 }
1309
1310 /* Flush unicast and multicast addresses */
1311 dev_uc_flush(bond_dev);
1312 dev_mc_flush(bond_dev);
1313
1314 if (slave_dev->type != ARPHRD_ETHER)
1315 bond_setup_by_slave(bond_dev, slave_dev);
1316 else {
1317 ether_setup(bond_dev);
1318 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1319 }
1320
1321 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1322 bond_dev);
1323 }
1324 } else if (bond_dev->type != slave_dev->type) {
1325 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1326 slave_dev->name,
1327 slave_dev->type, bond_dev->type);
1328 res = -EINVAL;
1329 goto err_undo_flags;
1330 }
1331
1332 if (slave_ops->ndo_set_mac_address == NULL) {
1333 if (!bond_has_slaves(bond)) {
1334 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1335 bond_dev->name);
1336 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1337 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1338 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1339 bond_dev->name);
1340 res = -EOPNOTSUPP;
1341 goto err_undo_flags;
1342 }
1343 }
1344
1345 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1346
1347 /* If this is the first slave, then we need to set the master's hardware
1348 * address to be the same as the slave's. */
1349 if (!bond_has_slaves(bond) &&
1350 bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1351 bond_set_dev_addr(bond->dev, slave_dev);
1352
1353 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1354 if (!new_slave) {
1355 res = -ENOMEM;
1356 goto err_undo_flags;
1357 }
1358 /*
1359 * Set the new_slave's queue_id to be zero. Queue ID mapping
1360 * is set via sysfs or module option if desired.
1361 */
1362 new_slave->queue_id = 0;
1363
1364 /* Save slave's original mtu and then set it to match the bond */
1365 new_slave->original_mtu = slave_dev->mtu;
1366 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1367 if (res) {
1368 pr_debug("Error %d calling dev_set_mtu\n", res);
1369 goto err_free;
1370 }
1371
1372 /*
1373 * Save slave's original ("permanent") mac address for modes
1374 * that need it, and for restoring it upon release, and then
1375 * set it to the master's address
1376 */
1377 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1378
1379 if (!bond->params.fail_over_mac) {
1380 /*
1381 * Set slave to master's mac address. The application already
1382 * set the master's mac address to that of the first slave
1383 */
1384 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1385 addr.sa_family = slave_dev->type;
1386 res = dev_set_mac_address(slave_dev, &addr);
1387 if (res) {
1388 pr_debug("Error %d calling set_mac_address\n", res);
1389 goto err_restore_mtu;
1390 }
1391 }
1392
1393 /* open the slave since the application closed it */
1394 res = dev_open(slave_dev);
1395 if (res) {
1396 pr_debug("Opening slave %s failed\n", slave_dev->name);
1397 goto err_restore_mac;
1398 }
1399
1400 new_slave->bond = bond;
1401 new_slave->dev = slave_dev;
1402 slave_dev->priv_flags |= IFF_BONDING;
1403
1404 if (bond_is_lb(bond)) {
1405 /* bond_alb_init_slave() must be called before all other stages since
1406 * it might fail and we do not want to have to undo everything
1407 */
1408 res = bond_alb_init_slave(bond, new_slave);
1409 if (res)
1410 goto err_close;
1411 }
1412
1413 /* If the mode USES_PRIMARY, then the following is handled by
1414 * bond_change_active_slave().
1415 */
1416 if (!USES_PRIMARY(bond->params.mode)) {
1417 /* set promiscuity level to new slave */
1418 if (bond_dev->flags & IFF_PROMISC) {
1419 res = dev_set_promiscuity(slave_dev, 1);
1420 if (res)
1421 goto err_close;
1422 }
1423
1424 /* set allmulti level to new slave */
1425 if (bond_dev->flags & IFF_ALLMULTI) {
1426 res = dev_set_allmulti(slave_dev, 1);
1427 if (res)
1428 goto err_close;
1429 }
1430
1431 netif_addr_lock_bh(bond_dev);
1432
1433 dev_mc_sync_multiple(slave_dev, bond_dev);
1434 dev_uc_sync_multiple(slave_dev, bond_dev);
1435
1436 netif_addr_unlock_bh(bond_dev);
1437 }
1438
1439 if (bond->params.mode == BOND_MODE_8023AD) {
1440 /* add lacpdu mc addr to mc list */
1441 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1442
1443 dev_mc_add(slave_dev, lacpdu_multicast);
1444 }
1445
1446 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1447 if (res) {
1448 pr_err("%s: Error: Couldn't add bond vlan ids to %s\n",
1449 bond_dev->name, slave_dev->name);
1450 goto err_close;
1451 }
1452
1453 prev_slave = bond_last_slave(bond);
1454
1455 new_slave->delay = 0;
1456 new_slave->link_failure_count = 0;
1457
1458 bond_update_speed_duplex(new_slave);
1459
1460 new_slave->last_arp_rx = jiffies -
1461 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1462 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1463 new_slave->target_last_arp_rx[i] = new_slave->last_arp_rx;
1464
1465 if (bond->params.miimon && !bond->params.use_carrier) {
1466 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1467
1468 if ((link_reporting == -1) && !bond->params.arp_interval) {
1469 /*
1470 * miimon is set but a bonded network driver
1471 * does not support ETHTOOL/MII and
1472 * arp_interval is not set. Note: if
1473 * use_carrier is enabled, we will never go
1474 * here (because netif_carrier is always
1475 * supported); thus, we don't need to change
1476 * the messages for netif_carrier.
1477 */
1478 pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1479 bond_dev->name, slave_dev->name);
1480 } else if (link_reporting == -1) {
1481 /* unable get link status using mii/ethtool */
1482 pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1483 bond_dev->name, slave_dev->name);
1484 }
1485 }
1486
1487 /* check for initial state */
1488 if (bond->params.miimon) {
1489 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1490 if (bond->params.updelay) {
1491 new_slave->link = BOND_LINK_BACK;
1492 new_slave->delay = bond->params.updelay;
1493 } else {
1494 new_slave->link = BOND_LINK_UP;
1495 }
1496 } else {
1497 new_slave->link = BOND_LINK_DOWN;
1498 }
1499 } else if (bond->params.arp_interval) {
1500 new_slave->link = (netif_carrier_ok(slave_dev) ?
1501 BOND_LINK_UP : BOND_LINK_DOWN);
1502 } else {
1503 new_slave->link = BOND_LINK_UP;
1504 }
1505
1506 if (new_slave->link != BOND_LINK_DOWN)
1507 new_slave->jiffies = jiffies;
1508 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1509 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1510 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1511
1512 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1513 /* if there is a primary slave, remember it */
1514 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1515 bond->primary_slave = new_slave;
1516 bond->force_primary = true;
1517 }
1518 }
1519
1520 switch (bond->params.mode) {
1521 case BOND_MODE_ACTIVEBACKUP:
1522 bond_set_slave_inactive_flags(new_slave);
1523 break;
1524 case BOND_MODE_8023AD:
1525 /* in 802.3ad mode, the internal mechanism
1526 * will activate the slaves in the selected
1527 * aggregator
1528 */
1529 bond_set_slave_inactive_flags(new_slave);
1530 /* if this is the first slave */
1531 if (!prev_slave) {
1532 SLAVE_AD_INFO(new_slave).id = 1;
1533 /* Initialize AD with the number of times that the AD timer is called in 1 second
1534 * can be called only after the mac address of the bond is set
1535 */
1536 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1537 } else {
1538 SLAVE_AD_INFO(new_slave).id =
1539 SLAVE_AD_INFO(prev_slave).id + 1;
1540 }
1541
1542 bond_3ad_bind_slave(new_slave);
1543 break;
1544 case BOND_MODE_TLB:
1545 case BOND_MODE_ALB:
1546 bond_set_active_slave(new_slave);
1547 bond_set_slave_inactive_flags(new_slave);
1548 break;
1549 default:
1550 pr_debug("This slave is always active in trunk mode\n");
1551
1552 /* always active in trunk mode */
1553 bond_set_active_slave(new_slave);
1554
1555 /* In trunking mode there is little meaning to curr_active_slave
1556 * anyway (it holds no special properties of the bond device),
1557 * so we can change it without calling change_active_interface()
1558 */
1559 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1560 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1561
1562 break;
1563 } /* switch(bond_mode) */
1564
1565 #ifdef CONFIG_NET_POLL_CONTROLLER
1566 slave_dev->npinfo = bond->dev->npinfo;
1567 if (slave_dev->npinfo) {
1568 if (slave_enable_netpoll(new_slave)) {
1569 read_unlock(&bond->lock);
1570 pr_info("Error, %s: master_dev is using netpoll, "
1571 "but new slave device does not support netpoll.\n",
1572 bond_dev->name);
1573 res = -EBUSY;
1574 goto err_detach;
1575 }
1576 }
1577 #endif
1578
1579 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1580 new_slave);
1581 if (res) {
1582 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1583 goto err_detach;
1584 }
1585
1586 res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1587 if (res) {
1588 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1589 goto err_unregister;
1590 }
1591
1592 bond->slave_cnt++;
1593 bond_compute_features(bond);
1594 bond_set_carrier(bond);
1595
1596 if (USES_PRIMARY(bond->params.mode)) {
1597 read_lock(&bond->lock);
1598 write_lock_bh(&bond->curr_slave_lock);
1599 bond_select_active_slave(bond);
1600 write_unlock_bh(&bond->curr_slave_lock);
1601 read_unlock(&bond->lock);
1602 }
1603
1604 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1605 bond_dev->name, slave_dev->name,
1606 bond_is_active_slave(new_slave) ? "n active" : " backup",
1607 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1608
1609 /* enslave is successful */
1610 return 0;
1611
1612 /* Undo stages on error */
1613 err_unregister:
1614 netdev_rx_handler_unregister(slave_dev);
1615
1616 err_detach:
1617 if (!USES_PRIMARY(bond->params.mode))
1618 bond_hw_addr_flush(bond_dev, slave_dev);
1619
1620 vlan_vids_del_by_dev(slave_dev, bond_dev);
1621 write_lock_bh(&bond->lock);
1622 if (bond->primary_slave == new_slave)
1623 bond->primary_slave = NULL;
1624 if (bond->curr_active_slave == new_slave) {
1625 bond_change_active_slave(bond, NULL);
1626 write_unlock_bh(&bond->lock);
1627 read_lock(&bond->lock);
1628 write_lock_bh(&bond->curr_slave_lock);
1629 bond_select_active_slave(bond);
1630 write_unlock_bh(&bond->curr_slave_lock);
1631 read_unlock(&bond->lock);
1632 } else {
1633 write_unlock_bh(&bond->lock);
1634 }
1635 slave_disable_netpoll(new_slave);
1636
1637 err_close:
1638 slave_dev->priv_flags &= ~IFF_BONDING;
1639 dev_close(slave_dev);
1640
1641 err_restore_mac:
1642 if (!bond->params.fail_over_mac) {
1643 /* XXX TODO - fom follow mode needs to change master's
1644 * MAC if this slave's MAC is in use by the bond, or at
1645 * least print a warning.
1646 */
1647 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1648 addr.sa_family = slave_dev->type;
1649 dev_set_mac_address(slave_dev, &addr);
1650 }
1651
1652 err_restore_mtu:
1653 dev_set_mtu(slave_dev, new_slave->original_mtu);
1654
1655 err_free:
1656 kfree(new_slave);
1657
1658 err_undo_flags:
1659 /* Enslave of first slave has failed and we need to fix master's mac */
1660 if (!bond_has_slaves(bond) &&
1661 ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1662 eth_hw_addr_random(bond_dev);
1663
1664 return res;
1665 }
1666
1667 /*
1668 * Try to release the slave device <slave> from the bond device <master>
1669 * It is legal to access curr_active_slave without a lock because all the function
1670 * is write-locked. If "all" is true it means that the function is being called
1671 * while destroying a bond interface and all slaves are being released.
1672 *
1673 * The rules for slave state should be:
1674 * for Active/Backup:
1675 * Active stays on all backups go down
1676 * for Bonded connections:
1677 * The first up interface should be left on and all others downed.
1678 */
1679 static int __bond_release_one(struct net_device *bond_dev,
1680 struct net_device *slave_dev,
1681 bool all)
1682 {
1683 struct bonding *bond = netdev_priv(bond_dev);
1684 struct slave *slave, *oldcurrent;
1685 struct sockaddr addr;
1686 int old_flags = bond_dev->flags;
1687 netdev_features_t old_features = bond_dev->features;
1688
1689 /* slave is not a slave or master is not master of this slave */
1690 if (!(slave_dev->flags & IFF_SLAVE) ||
1691 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1692 pr_err("%s: Error: cannot release %s.\n",
1693 bond_dev->name, slave_dev->name);
1694 return -EINVAL;
1695 }
1696
1697 block_netpoll_tx();
1698 write_lock_bh(&bond->lock);
1699
1700 slave = bond_get_slave_by_dev(bond, slave_dev);
1701 if (!slave) {
1702 /* not a slave of this bond */
1703 pr_info("%s: %s not enslaved\n",
1704 bond_dev->name, slave_dev->name);
1705 write_unlock_bh(&bond->lock);
1706 unblock_netpoll_tx();
1707 return -EINVAL;
1708 }
1709
1710 write_unlock_bh(&bond->lock);
1711
1712 /* release the slave from its bond */
1713 bond->slave_cnt--;
1714
1715 bond_upper_dev_unlink(bond_dev, slave_dev);
1716 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1717 * for this slave anymore.
1718 */
1719 netdev_rx_handler_unregister(slave_dev);
1720 write_lock_bh(&bond->lock);
1721
1722 /* Inform AD package of unbinding of slave. */
1723 if (bond->params.mode == BOND_MODE_8023AD) {
1724 /* must be called before the slave is
1725 * detached from the list
1726 */
1727 bond_3ad_unbind_slave(slave);
1728 }
1729
1730 pr_info("%s: releasing %s interface %s\n",
1731 bond_dev->name,
1732 bond_is_active_slave(slave) ? "active" : "backup",
1733 slave_dev->name);
1734
1735 oldcurrent = bond->curr_active_slave;
1736
1737 bond->current_arp_slave = NULL;
1738
1739 if (!all && !bond->params.fail_over_mac) {
1740 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
1741 bond_has_slaves(bond))
1742 pr_warn("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1743 bond_dev->name, slave_dev->name,
1744 slave->perm_hwaddr,
1745 bond_dev->name, slave_dev->name);
1746 }
1747
1748 if (bond->primary_slave == slave)
1749 bond->primary_slave = NULL;
1750
1751 if (oldcurrent == slave)
1752 bond_change_active_slave(bond, NULL);
1753
1754 if (bond_is_lb(bond)) {
1755 /* Must be called only after the slave has been
1756 * detached from the list and the curr_active_slave
1757 * has been cleared (if our_slave == old_current),
1758 * but before a new active slave is selected.
1759 */
1760 write_unlock_bh(&bond->lock);
1761 bond_alb_deinit_slave(bond, slave);
1762 write_lock_bh(&bond->lock);
1763 }
1764
1765 if (all) {
1766 rcu_assign_pointer(bond->curr_active_slave, NULL);
1767 } else if (oldcurrent == slave) {
1768 /*
1769 * Note that we hold RTNL over this sequence, so there
1770 * is no concern that another slave add/remove event
1771 * will interfere.
1772 */
1773 write_unlock_bh(&bond->lock);
1774 read_lock(&bond->lock);
1775 write_lock_bh(&bond->curr_slave_lock);
1776
1777 bond_select_active_slave(bond);
1778
1779 write_unlock_bh(&bond->curr_slave_lock);
1780 read_unlock(&bond->lock);
1781 write_lock_bh(&bond->lock);
1782 }
1783
1784 if (!bond_has_slaves(bond)) {
1785 bond_set_carrier(bond);
1786 eth_hw_addr_random(bond_dev);
1787
1788 if (vlan_uses_dev(bond_dev)) {
1789 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
1790 bond_dev->name, bond_dev->name);
1791 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
1792 bond_dev->name);
1793 }
1794 }
1795
1796 write_unlock_bh(&bond->lock);
1797 unblock_netpoll_tx();
1798 synchronize_rcu();
1799
1800 if (!bond_has_slaves(bond)) {
1801 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1802 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1803 }
1804
1805 bond_compute_features(bond);
1806 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1807 (old_features & NETIF_F_VLAN_CHALLENGED))
1808 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
1809 bond_dev->name, slave_dev->name, bond_dev->name);
1810
1811 /* must do this from outside any spinlocks */
1812 vlan_vids_del_by_dev(slave_dev, bond_dev);
1813
1814 /* If the mode USES_PRIMARY, then this cases was handled above by
1815 * bond_change_active_slave(..., NULL)
1816 */
1817 if (!USES_PRIMARY(bond->params.mode)) {
1818 /* unset promiscuity level from slave
1819 * NOTE: The NETDEV_CHANGEADDR call above may change the value
1820 * of the IFF_PROMISC flag in the bond_dev, but we need the
1821 * value of that flag before that change, as that was the value
1822 * when this slave was attached, so we cache at the start of the
1823 * function and use it here. Same goes for ALLMULTI below
1824 */
1825 if (old_flags & IFF_PROMISC)
1826 dev_set_promiscuity(slave_dev, -1);
1827
1828 /* unset allmulti level from slave */
1829 if (old_flags & IFF_ALLMULTI)
1830 dev_set_allmulti(slave_dev, -1);
1831
1832 bond_hw_addr_flush(bond_dev, slave_dev);
1833 }
1834
1835 slave_disable_netpoll(slave);
1836
1837 /* close slave before restoring its mac address */
1838 dev_close(slave_dev);
1839
1840 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1841 /* restore original ("permanent") mac address */
1842 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
1843 addr.sa_family = slave_dev->type;
1844 dev_set_mac_address(slave_dev, &addr);
1845 }
1846
1847 dev_set_mtu(slave_dev, slave->original_mtu);
1848
1849 slave_dev->priv_flags &= ~IFF_BONDING;
1850
1851 kfree(slave);
1852
1853 return 0; /* deletion OK */
1854 }
1855
1856 /* A wrapper used because of ndo_del_link */
1857 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1858 {
1859 return __bond_release_one(bond_dev, slave_dev, false);
1860 }
1861
1862 /*
1863 * First release a slave and then destroy the bond if no more slaves are left.
1864 * Must be under rtnl_lock when this function is called.
1865 */
1866 static int bond_release_and_destroy(struct net_device *bond_dev,
1867 struct net_device *slave_dev)
1868 {
1869 struct bonding *bond = netdev_priv(bond_dev);
1870 int ret;
1871
1872 ret = bond_release(bond_dev, slave_dev);
1873 if (ret == 0 && !bond_has_slaves(bond)) {
1874 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1875 pr_info("%s: destroying bond %s.\n",
1876 bond_dev->name, bond_dev->name);
1877 unregister_netdevice(bond_dev);
1878 }
1879 return ret;
1880 }
1881
1882 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1883 {
1884 struct bonding *bond = netdev_priv(bond_dev);
1885
1886 info->bond_mode = bond->params.mode;
1887 info->miimon = bond->params.miimon;
1888
1889 read_lock(&bond->lock);
1890 info->num_slaves = bond->slave_cnt;
1891 read_unlock(&bond->lock);
1892
1893 return 0;
1894 }
1895
1896 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1897 {
1898 struct bonding *bond = netdev_priv(bond_dev);
1899 struct list_head *iter;
1900 int i = 0, res = -ENODEV;
1901 struct slave *slave;
1902
1903 read_lock(&bond->lock);
1904 bond_for_each_slave(bond, slave, iter) {
1905 if (i++ == (int)info->slave_id) {
1906 res = 0;
1907 strcpy(info->slave_name, slave->dev->name);
1908 info->link = slave->link;
1909 info->state = bond_slave_state(slave);
1910 info->link_failure_count = slave->link_failure_count;
1911 break;
1912 }
1913 }
1914 read_unlock(&bond->lock);
1915
1916 return res;
1917 }
1918
1919 /*-------------------------------- Monitoring -------------------------------*/
1920
1921
1922 static int bond_miimon_inspect(struct bonding *bond)
1923 {
1924 int link_state, commit = 0;
1925 struct list_head *iter;
1926 struct slave *slave;
1927 bool ignore_updelay;
1928
1929 ignore_updelay = !bond->curr_active_slave ? true : false;
1930
1931 bond_for_each_slave(bond, slave, iter) {
1932 slave->new_link = BOND_LINK_NOCHANGE;
1933
1934 link_state = bond_check_dev_link(bond, slave->dev, 0);
1935
1936 switch (slave->link) {
1937 case BOND_LINK_UP:
1938 if (link_state)
1939 continue;
1940
1941 slave->link = BOND_LINK_FAIL;
1942 slave->delay = bond->params.downdelay;
1943 if (slave->delay) {
1944 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
1945 bond->dev->name,
1946 (bond->params.mode ==
1947 BOND_MODE_ACTIVEBACKUP) ?
1948 (bond_is_active_slave(slave) ?
1949 "active " : "backup ") : "",
1950 slave->dev->name,
1951 bond->params.downdelay * bond->params.miimon);
1952 }
1953 /*FALLTHRU*/
1954 case BOND_LINK_FAIL:
1955 if (link_state) {
1956 /*
1957 * recovered before downdelay expired
1958 */
1959 slave->link = BOND_LINK_UP;
1960 slave->jiffies = jiffies;
1961 pr_info("%s: link status up again after %d ms for interface %s.\n",
1962 bond->dev->name,
1963 (bond->params.downdelay - slave->delay) *
1964 bond->params.miimon,
1965 slave->dev->name);
1966 continue;
1967 }
1968
1969 if (slave->delay <= 0) {
1970 slave->new_link = BOND_LINK_DOWN;
1971 commit++;
1972 continue;
1973 }
1974
1975 slave->delay--;
1976 break;
1977
1978 case BOND_LINK_DOWN:
1979 if (!link_state)
1980 continue;
1981
1982 slave->link = BOND_LINK_BACK;
1983 slave->delay = bond->params.updelay;
1984
1985 if (slave->delay) {
1986 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
1987 bond->dev->name, slave->dev->name,
1988 ignore_updelay ? 0 :
1989 bond->params.updelay *
1990 bond->params.miimon);
1991 }
1992 /*FALLTHRU*/
1993 case BOND_LINK_BACK:
1994 if (!link_state) {
1995 slave->link = BOND_LINK_DOWN;
1996 pr_info("%s: link status down again after %d ms for interface %s.\n",
1997 bond->dev->name,
1998 (bond->params.updelay - slave->delay) *
1999 bond->params.miimon,
2000 slave->dev->name);
2001
2002 continue;
2003 }
2004
2005 if (ignore_updelay)
2006 slave->delay = 0;
2007
2008 if (slave->delay <= 0) {
2009 slave->new_link = BOND_LINK_UP;
2010 commit++;
2011 ignore_updelay = false;
2012 continue;
2013 }
2014
2015 slave->delay--;
2016 break;
2017 }
2018 }
2019
2020 return commit;
2021 }
2022
2023 static void bond_miimon_commit(struct bonding *bond)
2024 {
2025 struct list_head *iter;
2026 struct slave *slave;
2027
2028 bond_for_each_slave(bond, slave, iter) {
2029 switch (slave->new_link) {
2030 case BOND_LINK_NOCHANGE:
2031 continue;
2032
2033 case BOND_LINK_UP:
2034 slave->link = BOND_LINK_UP;
2035 slave->jiffies = jiffies;
2036
2037 if (bond->params.mode == BOND_MODE_8023AD) {
2038 /* prevent it from being the active one */
2039 bond_set_backup_slave(slave);
2040 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2041 /* make it immediately active */
2042 bond_set_active_slave(slave);
2043 } else if (slave != bond->primary_slave) {
2044 /* prevent it from being the active one */
2045 bond_set_backup_slave(slave);
2046 }
2047
2048 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2049 bond->dev->name, slave->dev->name,
2050 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2051 slave->duplex ? "full" : "half");
2052
2053 /* notify ad that the link status has changed */
2054 if (bond->params.mode == BOND_MODE_8023AD)
2055 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2056
2057 if (bond_is_lb(bond))
2058 bond_alb_handle_link_change(bond, slave,
2059 BOND_LINK_UP);
2060
2061 if (!bond->curr_active_slave ||
2062 (slave == bond->primary_slave))
2063 goto do_failover;
2064
2065 continue;
2066
2067 case BOND_LINK_DOWN:
2068 if (slave->link_failure_count < UINT_MAX)
2069 slave->link_failure_count++;
2070
2071 slave->link = BOND_LINK_DOWN;
2072
2073 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2074 bond->params.mode == BOND_MODE_8023AD)
2075 bond_set_slave_inactive_flags(slave);
2076
2077 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2078 bond->dev->name, slave->dev->name);
2079
2080 if (bond->params.mode == BOND_MODE_8023AD)
2081 bond_3ad_handle_link_change(slave,
2082 BOND_LINK_DOWN);
2083
2084 if (bond_is_lb(bond))
2085 bond_alb_handle_link_change(bond, slave,
2086 BOND_LINK_DOWN);
2087
2088 if (slave == bond->curr_active_slave)
2089 goto do_failover;
2090
2091 continue;
2092
2093 default:
2094 pr_err("%s: invalid new link %d on slave %s\n",
2095 bond->dev->name, slave->new_link,
2096 slave->dev->name);
2097 slave->new_link = BOND_LINK_NOCHANGE;
2098
2099 continue;
2100 }
2101
2102 do_failover:
2103 ASSERT_RTNL();
2104 block_netpoll_tx();
2105 write_lock_bh(&bond->curr_slave_lock);
2106 bond_select_active_slave(bond);
2107 write_unlock_bh(&bond->curr_slave_lock);
2108 unblock_netpoll_tx();
2109 }
2110
2111 bond_set_carrier(bond);
2112 }
2113
2114 /*
2115 * bond_mii_monitor
2116 *
2117 * Really a wrapper that splits the mii monitor into two phases: an
2118 * inspection, then (if inspection indicates something needs to be done)
2119 * an acquisition of appropriate locks followed by a commit phase to
2120 * implement whatever link state changes are indicated.
2121 */
2122 void bond_mii_monitor(struct work_struct *work)
2123 {
2124 struct bonding *bond = container_of(work, struct bonding,
2125 mii_work.work);
2126 bool should_notify_peers = false;
2127 unsigned long delay;
2128
2129 read_lock(&bond->lock);
2130
2131 delay = msecs_to_jiffies(bond->params.miimon);
2132
2133 if (!bond_has_slaves(bond))
2134 goto re_arm;
2135
2136 should_notify_peers = bond_should_notify_peers(bond);
2137
2138 if (bond_miimon_inspect(bond)) {
2139 read_unlock(&bond->lock);
2140
2141 /* Race avoidance with bond_close cancel of workqueue */
2142 if (!rtnl_trylock()) {
2143 read_lock(&bond->lock);
2144 delay = 1;
2145 should_notify_peers = false;
2146 goto re_arm;
2147 }
2148
2149 read_lock(&bond->lock);
2150
2151 bond_miimon_commit(bond);
2152
2153 read_unlock(&bond->lock);
2154 rtnl_unlock(); /* might sleep, hold no other locks */
2155 read_lock(&bond->lock);
2156 }
2157
2158 re_arm:
2159 if (bond->params.miimon)
2160 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2161
2162 read_unlock(&bond->lock);
2163
2164 if (should_notify_peers) {
2165 if (!rtnl_trylock())
2166 return;
2167 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2168 rtnl_unlock();
2169 }
2170 }
2171
2172 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2173 {
2174 struct net_device *upper;
2175 struct list_head *iter;
2176 bool ret = false;
2177
2178 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2179 return true;
2180
2181 rcu_read_lock();
2182 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2183 if (ip == bond_confirm_addr(upper, 0, ip)) {
2184 ret = true;
2185 break;
2186 }
2187 }
2188 rcu_read_unlock();
2189
2190 return ret;
2191 }
2192
2193 /*
2194 * We go to the (large) trouble of VLAN tagging ARP frames because
2195 * switches in VLAN mode (especially if ports are configured as
2196 * "native" to a VLAN) might not pass non-tagged frames.
2197 */
2198 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2199 {
2200 struct sk_buff *skb;
2201
2202 pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2203 slave_dev->name, &dest_ip, &src_ip, vlan_id);
2204
2205 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2206 NULL, slave_dev->dev_addr, NULL);
2207
2208 if (!skb) {
2209 pr_err("ARP packet allocation failed\n");
2210 return;
2211 }
2212 if (vlan_id) {
2213 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2214 if (!skb) {
2215 pr_err("failed to insert VLAN tag\n");
2216 return;
2217 }
2218 }
2219 arp_xmit(skb);
2220 }
2221
2222
2223 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2224 {
2225 struct net_device *upper, *vlan_upper;
2226 struct list_head *iter, *vlan_iter;
2227 struct rtable *rt;
2228 __be32 *targets = bond->params.arp_targets, addr;
2229 int i, vlan_id;
2230
2231 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2232 pr_debug("basa: target %pI4\n", &targets[i]);
2233
2234 /* Find out through which dev should the packet go */
2235 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2236 RTO_ONLINK, 0);
2237 if (IS_ERR(rt)) {
2238 pr_debug("%s: no route to arp_ip_target %pI4\n",
2239 bond->dev->name, &targets[i]);
2240 continue;
2241 }
2242
2243 vlan_id = 0;
2244
2245 /* bond device itself */
2246 if (rt->dst.dev == bond->dev)
2247 goto found;
2248
2249 rcu_read_lock();
2250 /* first we search only for vlan devices. for every vlan
2251 * found we verify its upper dev list, searching for the
2252 * rt->dst.dev. If found we save the tag of the vlan and
2253 * proceed to send the packet.
2254 *
2255 * TODO: QinQ?
2256 */
2257 netdev_for_each_all_upper_dev_rcu(bond->dev, vlan_upper,
2258 vlan_iter) {
2259 if (!is_vlan_dev(vlan_upper))
2260 continue;
2261 netdev_for_each_all_upper_dev_rcu(vlan_upper, upper,
2262 iter) {
2263 if (upper == rt->dst.dev) {
2264 vlan_id = vlan_dev_vlan_id(vlan_upper);
2265 rcu_read_unlock();
2266 goto found;
2267 }
2268 }
2269 }
2270
2271 /* if the device we're looking for is not on top of any of
2272 * our upper vlans, then just search for any dev that
2273 * matches, and in case it's a vlan - save the id
2274 */
2275 netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2276 if (upper == rt->dst.dev) {
2277 /* if it's a vlan - get its VID */
2278 if (is_vlan_dev(upper))
2279 vlan_id = vlan_dev_vlan_id(upper);
2280
2281 rcu_read_unlock();
2282 goto found;
2283 }
2284 }
2285 rcu_read_unlock();
2286
2287 /* Not our device - skip */
2288 pr_debug("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2289 bond->dev->name, &targets[i],
2290 rt->dst.dev ? rt->dst.dev->name : "NULL");
2291
2292 ip_rt_put(rt);
2293 continue;
2294
2295 found:
2296 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2297 ip_rt_put(rt);
2298 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2299 addr, vlan_id);
2300 }
2301 }
2302
2303 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2304 {
2305 int i;
2306
2307 if (!sip || !bond_has_this_ip(bond, tip)) {
2308 pr_debug("bva: sip %pI4 tip %pI4 not found\n", &sip, &tip);
2309 return;
2310 }
2311
2312 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2313 if (i == -1) {
2314 pr_debug("bva: sip %pI4 not found in targets\n", &sip);
2315 return;
2316 }
2317 slave->last_arp_rx = jiffies;
2318 slave->target_last_arp_rx[i] = jiffies;
2319 }
2320
2321 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2322 struct slave *slave)
2323 {
2324 struct arphdr *arp = (struct arphdr *)skb->data;
2325 unsigned char *arp_ptr;
2326 __be32 sip, tip;
2327 int alen;
2328
2329 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2330 return RX_HANDLER_ANOTHER;
2331
2332 read_lock(&bond->lock);
2333
2334 if (!slave_do_arp_validate(bond, slave))
2335 goto out_unlock;
2336
2337 alen = arp_hdr_len(bond->dev);
2338
2339 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2340 bond->dev->name, skb->dev->name);
2341
2342 if (alen > skb_headlen(skb)) {
2343 arp = kmalloc(alen, GFP_ATOMIC);
2344 if (!arp)
2345 goto out_unlock;
2346 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2347 goto out_unlock;
2348 }
2349
2350 if (arp->ar_hln != bond->dev->addr_len ||
2351 skb->pkt_type == PACKET_OTHERHOST ||
2352 skb->pkt_type == PACKET_LOOPBACK ||
2353 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2354 arp->ar_pro != htons(ETH_P_IP) ||
2355 arp->ar_pln != 4)
2356 goto out_unlock;
2357
2358 arp_ptr = (unsigned char *)(arp + 1);
2359 arp_ptr += bond->dev->addr_len;
2360 memcpy(&sip, arp_ptr, 4);
2361 arp_ptr += 4 + bond->dev->addr_len;
2362 memcpy(&tip, arp_ptr, 4);
2363
2364 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2365 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2366 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2367 &sip, &tip);
2368
2369 /*
2370 * Backup slaves won't see the ARP reply, but do come through
2371 * here for each ARP probe (so we swap the sip/tip to validate
2372 * the probe). In a "redundant switch, common router" type of
2373 * configuration, the ARP probe will (hopefully) travel from
2374 * the active, through one switch, the router, then the other
2375 * switch before reaching the backup.
2376 *
2377 * We 'trust' the arp requests if there is an active slave and
2378 * it received valid arp reply(s) after it became active. This
2379 * is done to avoid endless looping when we can't reach the
2380 * arp_ip_target and fool ourselves with our own arp requests.
2381 */
2382 if (bond_is_active_slave(slave))
2383 bond_validate_arp(bond, slave, sip, tip);
2384 else if (bond->curr_active_slave &&
2385 time_after(slave_last_rx(bond, bond->curr_active_slave),
2386 bond->curr_active_slave->jiffies))
2387 bond_validate_arp(bond, slave, tip, sip);
2388
2389 out_unlock:
2390 read_unlock(&bond->lock);
2391 if (arp != (struct arphdr *)skb->data)
2392 kfree(arp);
2393 return RX_HANDLER_ANOTHER;
2394 }
2395
2396 /* function to verify if we're in the arp_interval timeslice, returns true if
2397 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2398 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2399 */
2400 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2401 int mod)
2402 {
2403 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2404
2405 return time_in_range(jiffies,
2406 last_act - delta_in_ticks,
2407 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2408 }
2409
2410 /*
2411 * this function is called regularly to monitor each slave's link
2412 * ensuring that traffic is being sent and received when arp monitoring
2413 * is used in load-balancing mode. if the adapter has been dormant, then an
2414 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2415 * arp monitoring in active backup mode.
2416 */
2417 void bond_loadbalance_arp_mon(struct work_struct *work)
2418 {
2419 struct bonding *bond = container_of(work, struct bonding,
2420 arp_work.work);
2421 struct slave *slave, *oldcurrent;
2422 struct list_head *iter;
2423 int do_failover = 0;
2424
2425 read_lock(&bond->lock);
2426
2427 if (!bond_has_slaves(bond))
2428 goto re_arm;
2429
2430 oldcurrent = bond->curr_active_slave;
2431 /* see if any of the previous devices are up now (i.e. they have
2432 * xmt and rcv traffic). the curr_active_slave does not come into
2433 * the picture unless it is null. also, slave->jiffies is not needed
2434 * here because we send an arp on each slave and give a slave as
2435 * long as it needs to get the tx/rx within the delta.
2436 * TODO: what about up/down delay in arp mode? it wasn't here before
2437 * so it can wait
2438 */
2439 bond_for_each_slave(bond, slave, iter) {
2440 unsigned long trans_start = dev_trans_start(slave->dev);
2441
2442 if (slave->link != BOND_LINK_UP) {
2443 if (bond_time_in_interval(bond, trans_start, 1) &&
2444 bond_time_in_interval(bond, slave->dev->last_rx, 1)) {
2445
2446 slave->link = BOND_LINK_UP;
2447 bond_set_active_slave(slave);
2448
2449 /* primary_slave has no meaning in round-robin
2450 * mode. the window of a slave being up and
2451 * curr_active_slave being null after enslaving
2452 * is closed.
2453 */
2454 if (!oldcurrent) {
2455 pr_info("%s: link status definitely up for interface %s, ",
2456 bond->dev->name,
2457 slave->dev->name);
2458 do_failover = 1;
2459 } else {
2460 pr_info("%s: interface %s is now up\n",
2461 bond->dev->name,
2462 slave->dev->name);
2463 }
2464 }
2465 } else {
2466 /* slave->link == BOND_LINK_UP */
2467
2468 /* not all switches will respond to an arp request
2469 * when the source ip is 0, so don't take the link down
2470 * if we don't know our ip yet
2471 */
2472 if (!bond_time_in_interval(bond, trans_start, 2) ||
2473 !bond_time_in_interval(bond, slave->dev->last_rx, 2)) {
2474
2475 slave->link = BOND_LINK_DOWN;
2476 bond_set_backup_slave(slave);
2477
2478 if (slave->link_failure_count < UINT_MAX)
2479 slave->link_failure_count++;
2480
2481 pr_info("%s: interface %s is now down.\n",
2482 bond->dev->name,
2483 slave->dev->name);
2484
2485 if (slave == oldcurrent)
2486 do_failover = 1;
2487 }
2488 }
2489
2490 /* note: if switch is in round-robin mode, all links
2491 * must tx arp to ensure all links rx an arp - otherwise
2492 * links may oscillate or not come up at all; if switch is
2493 * in something like xor mode, there is nothing we can
2494 * do - all replies will be rx'ed on same link causing slaves
2495 * to be unstable during low/no traffic periods
2496 */
2497 if (IS_UP(slave->dev))
2498 bond_arp_send_all(bond, slave);
2499 }
2500
2501 if (do_failover) {
2502 block_netpoll_tx();
2503 write_lock_bh(&bond->curr_slave_lock);
2504
2505 bond_select_active_slave(bond);
2506
2507 write_unlock_bh(&bond->curr_slave_lock);
2508 unblock_netpoll_tx();
2509 }
2510
2511 re_arm:
2512 if (bond->params.arp_interval)
2513 queue_delayed_work(bond->wq, &bond->arp_work,
2514 msecs_to_jiffies(bond->params.arp_interval));
2515
2516 read_unlock(&bond->lock);
2517 }
2518
2519 /*
2520 * Called to inspect slaves for active-backup mode ARP monitor link state
2521 * changes. Sets new_link in slaves to specify what action should take
2522 * place for the slave. Returns 0 if no changes are found, >0 if changes
2523 * to link states must be committed.
2524 *
2525 * Called with bond->lock held for read.
2526 */
2527 static int bond_ab_arp_inspect(struct bonding *bond)
2528 {
2529 unsigned long trans_start, last_rx;
2530 struct list_head *iter;
2531 struct slave *slave;
2532 int commit = 0;
2533
2534 bond_for_each_slave(bond, slave, iter) {
2535 slave->new_link = BOND_LINK_NOCHANGE;
2536 last_rx = slave_last_rx(bond, slave);
2537
2538 if (slave->link != BOND_LINK_UP) {
2539 if (bond_time_in_interval(bond, last_rx, 1)) {
2540 slave->new_link = BOND_LINK_UP;
2541 commit++;
2542 }
2543 continue;
2544 }
2545
2546 /*
2547 * Give slaves 2*delta after being enslaved or made
2548 * active. This avoids bouncing, as the last receive
2549 * times need a full ARP monitor cycle to be updated.
2550 */
2551 if (bond_time_in_interval(bond, slave->jiffies, 2))
2552 continue;
2553
2554 /*
2555 * Backup slave is down if:
2556 * - No current_arp_slave AND
2557 * - more than 3*delta since last receive AND
2558 * - the bond has an IP address
2559 *
2560 * Note: a non-null current_arp_slave indicates
2561 * the curr_active_slave went down and we are
2562 * searching for a new one; under this condition
2563 * we only take the curr_active_slave down - this
2564 * gives each slave a chance to tx/rx traffic
2565 * before being taken out
2566 */
2567 if (!bond_is_active_slave(slave) &&
2568 !bond->current_arp_slave &&
2569 !bond_time_in_interval(bond, last_rx, 3)) {
2570 slave->new_link = BOND_LINK_DOWN;
2571 commit++;
2572 }
2573
2574 /*
2575 * Active slave is down if:
2576 * - more than 2*delta since transmitting OR
2577 * - (more than 2*delta since receive AND
2578 * the bond has an IP address)
2579 */
2580 trans_start = dev_trans_start(slave->dev);
2581 if (bond_is_active_slave(slave) &&
2582 (!bond_time_in_interval(bond, trans_start, 2) ||
2583 !bond_time_in_interval(bond, last_rx, 2))) {
2584 slave->new_link = BOND_LINK_DOWN;
2585 commit++;
2586 }
2587 }
2588
2589 return commit;
2590 }
2591
2592 /*
2593 * Called to commit link state changes noted by inspection step of
2594 * active-backup mode ARP monitor.
2595 *
2596 * Called with RTNL and bond->lock for read.
2597 */
2598 static void bond_ab_arp_commit(struct bonding *bond)
2599 {
2600 unsigned long trans_start;
2601 struct list_head *iter;
2602 struct slave *slave;
2603
2604 bond_for_each_slave(bond, slave, iter) {
2605 switch (slave->new_link) {
2606 case BOND_LINK_NOCHANGE:
2607 continue;
2608
2609 case BOND_LINK_UP:
2610 trans_start = dev_trans_start(slave->dev);
2611 if (bond->curr_active_slave != slave ||
2612 (!bond->curr_active_slave &&
2613 bond_time_in_interval(bond, trans_start, 1))) {
2614 slave->link = BOND_LINK_UP;
2615 if (bond->current_arp_slave) {
2616 bond_set_slave_inactive_flags(
2617 bond->current_arp_slave);
2618 bond->current_arp_slave = NULL;
2619 }
2620
2621 pr_info("%s: link status definitely up for interface %s.\n",
2622 bond->dev->name, slave->dev->name);
2623
2624 if (!bond->curr_active_slave ||
2625 (slave == bond->primary_slave))
2626 goto do_failover;
2627
2628 }
2629
2630 continue;
2631
2632 case BOND_LINK_DOWN:
2633 if (slave->link_failure_count < UINT_MAX)
2634 slave->link_failure_count++;
2635
2636 slave->link = BOND_LINK_DOWN;
2637 bond_set_slave_inactive_flags(slave);
2638
2639 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2640 bond->dev->name, slave->dev->name);
2641
2642 if (slave == bond->curr_active_slave) {
2643 bond->current_arp_slave = NULL;
2644 goto do_failover;
2645 }
2646
2647 continue;
2648
2649 default:
2650 pr_err("%s: impossible: new_link %d on slave %s\n",
2651 bond->dev->name, slave->new_link,
2652 slave->dev->name);
2653 continue;
2654 }
2655
2656 do_failover:
2657 ASSERT_RTNL();
2658 block_netpoll_tx();
2659 write_lock_bh(&bond->curr_slave_lock);
2660 bond_select_active_slave(bond);
2661 write_unlock_bh(&bond->curr_slave_lock);
2662 unblock_netpoll_tx();
2663 }
2664
2665 bond_set_carrier(bond);
2666 }
2667
2668 /*
2669 * Send ARP probes for active-backup mode ARP monitor.
2670 *
2671 * Called with bond->lock held for read.
2672 */
2673 static void bond_ab_arp_probe(struct bonding *bond)
2674 {
2675 struct slave *slave, *before = NULL, *new_slave = NULL;
2676 struct list_head *iter;
2677 bool found = false;
2678
2679 read_lock(&bond->curr_slave_lock);
2680
2681 if (bond->current_arp_slave && bond->curr_active_slave)
2682 pr_info("PROBE: c_arp %s && cas %s BAD\n",
2683 bond->current_arp_slave->dev->name,
2684 bond->curr_active_slave->dev->name);
2685
2686 if (bond->curr_active_slave) {
2687 bond_arp_send_all(bond, bond->curr_active_slave);
2688 read_unlock(&bond->curr_slave_lock);
2689 return;
2690 }
2691
2692 read_unlock(&bond->curr_slave_lock);
2693
2694 /* if we don't have a curr_active_slave, search for the next available
2695 * backup slave from the current_arp_slave and make it the candidate
2696 * for becoming the curr_active_slave
2697 */
2698
2699 if (!bond->current_arp_slave) {
2700 bond->current_arp_slave = bond_first_slave(bond);
2701 if (!bond->current_arp_slave)
2702 return;
2703 }
2704
2705 bond_set_slave_inactive_flags(bond->current_arp_slave);
2706
2707 bond_for_each_slave(bond, slave, iter) {
2708 if (!found && !before && IS_UP(slave->dev))
2709 before = slave;
2710
2711 if (found && !new_slave && IS_UP(slave->dev))
2712 new_slave = slave;
2713 /* if the link state is up at this point, we
2714 * mark it down - this can happen if we have
2715 * simultaneous link failures and
2716 * reselect_active_interface doesn't make this
2717 * one the current slave so it is still marked
2718 * up when it is actually down
2719 */
2720 if (!IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
2721 slave->link = BOND_LINK_DOWN;
2722 if (slave->link_failure_count < UINT_MAX)
2723 slave->link_failure_count++;
2724
2725 bond_set_slave_inactive_flags(slave);
2726
2727 pr_info("%s: backup interface %s is now down.\n",
2728 bond->dev->name, slave->dev->name);
2729 }
2730 if (slave == bond->current_arp_slave)
2731 found = true;
2732 }
2733
2734 if (!new_slave && before)
2735 new_slave = before;
2736
2737 if (!new_slave)
2738 return;
2739
2740 new_slave->link = BOND_LINK_BACK;
2741 bond_set_slave_active_flags(new_slave);
2742 bond_arp_send_all(bond, new_slave);
2743 new_slave->jiffies = jiffies;
2744 bond->current_arp_slave = new_slave;
2745
2746 }
2747
2748 void bond_activebackup_arp_mon(struct work_struct *work)
2749 {
2750 struct bonding *bond = container_of(work, struct bonding,
2751 arp_work.work);
2752 bool should_notify_peers = false;
2753 int delta_in_ticks;
2754
2755 read_lock(&bond->lock);
2756
2757 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2758
2759 if (!bond_has_slaves(bond))
2760 goto re_arm;
2761
2762 should_notify_peers = bond_should_notify_peers(bond);
2763
2764 if (bond_ab_arp_inspect(bond)) {
2765 read_unlock(&bond->lock);
2766
2767 /* Race avoidance with bond_close flush of workqueue */
2768 if (!rtnl_trylock()) {
2769 read_lock(&bond->lock);
2770 delta_in_ticks = 1;
2771 should_notify_peers = false;
2772 goto re_arm;
2773 }
2774
2775 read_lock(&bond->lock);
2776
2777 bond_ab_arp_commit(bond);
2778
2779 read_unlock(&bond->lock);
2780 rtnl_unlock();
2781 read_lock(&bond->lock);
2782 }
2783
2784 bond_ab_arp_probe(bond);
2785
2786 re_arm:
2787 if (bond->params.arp_interval)
2788 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2789
2790 read_unlock(&bond->lock);
2791
2792 if (should_notify_peers) {
2793 if (!rtnl_trylock())
2794 return;
2795 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2796 rtnl_unlock();
2797 }
2798 }
2799
2800 /*-------------------------- netdev event handling --------------------------*/
2801
2802 /*
2803 * Change device name
2804 */
2805 static int bond_event_changename(struct bonding *bond)
2806 {
2807 bond_remove_proc_entry(bond);
2808 bond_create_proc_entry(bond);
2809
2810 bond_debug_reregister(bond);
2811
2812 return NOTIFY_DONE;
2813 }
2814
2815 static int bond_master_netdev_event(unsigned long event,
2816 struct net_device *bond_dev)
2817 {
2818 struct bonding *event_bond = netdev_priv(bond_dev);
2819
2820 switch (event) {
2821 case NETDEV_CHANGENAME:
2822 return bond_event_changename(event_bond);
2823 case NETDEV_UNREGISTER:
2824 bond_remove_proc_entry(event_bond);
2825 break;
2826 case NETDEV_REGISTER:
2827 bond_create_proc_entry(event_bond);
2828 break;
2829 case NETDEV_NOTIFY_PEERS:
2830 if (event_bond->send_peer_notif)
2831 event_bond->send_peer_notif--;
2832 break;
2833 default:
2834 break;
2835 }
2836
2837 return NOTIFY_DONE;
2838 }
2839
2840 static int bond_slave_netdev_event(unsigned long event,
2841 struct net_device *slave_dev)
2842 {
2843 struct slave *slave = bond_slave_get_rtnl(slave_dev);
2844 struct bonding *bond;
2845 struct net_device *bond_dev;
2846 u32 old_speed;
2847 u8 old_duplex;
2848
2849 /* A netdev event can be generated while enslaving a device
2850 * before netdev_rx_handler_register is called in which case
2851 * slave will be NULL
2852 */
2853 if (!slave)
2854 return NOTIFY_DONE;
2855 bond_dev = slave->bond->dev;
2856 bond = slave->bond;
2857
2858 switch (event) {
2859 case NETDEV_UNREGISTER:
2860 if (bond_dev->type != ARPHRD_ETHER)
2861 bond_release_and_destroy(bond_dev, slave_dev);
2862 else
2863 bond_release(bond_dev, slave_dev);
2864 break;
2865 case NETDEV_UP:
2866 case NETDEV_CHANGE:
2867 old_speed = slave->speed;
2868 old_duplex = slave->duplex;
2869
2870 bond_update_speed_duplex(slave);
2871
2872 if (bond->params.mode == BOND_MODE_8023AD) {
2873 if (old_speed != slave->speed)
2874 bond_3ad_adapter_speed_changed(slave);
2875 if (old_duplex != slave->duplex)
2876 bond_3ad_adapter_duplex_changed(slave);
2877 }
2878 break;
2879 case NETDEV_DOWN:
2880 /*
2881 * ... Or is it this?
2882 */
2883 break;
2884 case NETDEV_CHANGEMTU:
2885 /*
2886 * TODO: Should slaves be allowed to
2887 * independently alter their MTU? For
2888 * an active-backup bond, slaves need
2889 * not be the same type of device, so
2890 * MTUs may vary. For other modes,
2891 * slaves arguably should have the
2892 * same MTUs. To do this, we'd need to
2893 * take over the slave's change_mtu
2894 * function for the duration of their
2895 * servitude.
2896 */
2897 break;
2898 case NETDEV_CHANGENAME:
2899 /*
2900 * TODO: handle changing the primary's name
2901 */
2902 break;
2903 case NETDEV_FEAT_CHANGE:
2904 bond_compute_features(bond);
2905 break;
2906 case NETDEV_RESEND_IGMP:
2907 /* Propagate to master device */
2908 call_netdevice_notifiers(event, slave->bond->dev);
2909 break;
2910 default:
2911 break;
2912 }
2913
2914 return NOTIFY_DONE;
2915 }
2916
2917 /*
2918 * bond_netdev_event: handle netdev notifier chain events.
2919 *
2920 * This function receives events for the netdev chain. The caller (an
2921 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2922 * locks for us to safely manipulate the slave devices (RTNL lock,
2923 * dev_probe_lock).
2924 */
2925 static int bond_netdev_event(struct notifier_block *this,
2926 unsigned long event, void *ptr)
2927 {
2928 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2929
2930 pr_debug("event_dev: %s, event: %lx\n",
2931 event_dev ? event_dev->name : "None",
2932 event);
2933
2934 if (!(event_dev->priv_flags & IFF_BONDING))
2935 return NOTIFY_DONE;
2936
2937 if (event_dev->flags & IFF_MASTER) {
2938 pr_debug("IFF_MASTER\n");
2939 return bond_master_netdev_event(event, event_dev);
2940 }
2941
2942 if (event_dev->flags & IFF_SLAVE) {
2943 pr_debug("IFF_SLAVE\n");
2944 return bond_slave_netdev_event(event, event_dev);
2945 }
2946
2947 return NOTIFY_DONE;
2948 }
2949
2950 static struct notifier_block bond_netdev_notifier = {
2951 .notifier_call = bond_netdev_event,
2952 };
2953
2954 /*---------------------------- Hashing Policies -----------------------------*/
2955
2956 /* L2 hash helper */
2957 static inline u32 bond_eth_hash(struct sk_buff *skb)
2958 {
2959 struct ethhdr *data = (struct ethhdr *)skb->data;
2960
2961 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
2962 return data->h_dest[5] ^ data->h_source[5];
2963
2964 return 0;
2965 }
2966
2967 /* Extract the appropriate headers based on bond's xmit policy */
2968 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
2969 struct flow_keys *fk)
2970 {
2971 const struct ipv6hdr *iph6;
2972 const struct iphdr *iph;
2973 int noff, proto = -1;
2974
2975 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
2976 return skb_flow_dissect(skb, fk);
2977
2978 fk->ports = 0;
2979 noff = skb_network_offset(skb);
2980 if (skb->protocol == htons(ETH_P_IP)) {
2981 if (!pskb_may_pull(skb, noff + sizeof(*iph)))
2982 return false;
2983 iph = ip_hdr(skb);
2984 fk->src = iph->saddr;
2985 fk->dst = iph->daddr;
2986 noff += iph->ihl << 2;
2987 if (!ip_is_fragment(iph))
2988 proto = iph->protocol;
2989 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2990 if (!pskb_may_pull(skb, noff + sizeof(*iph6)))
2991 return false;
2992 iph6 = ipv6_hdr(skb);
2993 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
2994 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
2995 noff += sizeof(*iph6);
2996 proto = iph6->nexthdr;
2997 } else {
2998 return false;
2999 }
3000 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3001 fk->ports = skb_flow_get_ports(skb, noff, proto);
3002
3003 return true;
3004 }
3005
3006 /**
3007 * bond_xmit_hash - generate a hash value based on the xmit policy
3008 * @bond: bonding device
3009 * @skb: buffer to use for headers
3010 * @count: modulo value
3011 *
3012 * This function will extract the necessary headers from the skb buffer and use
3013 * them to generate a hash based on the xmit_policy set in the bonding device
3014 * which will be reduced modulo count before returning.
3015 */
3016 int bond_xmit_hash(struct bonding *bond, struct sk_buff *skb, int count)
3017 {
3018 struct flow_keys flow;
3019 u32 hash;
3020
3021 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3022 !bond_flow_dissect(bond, skb, &flow))
3023 return bond_eth_hash(skb) % count;
3024
3025 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3026 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3027 hash = bond_eth_hash(skb);
3028 else
3029 hash = (__force u32)flow.ports;
3030 hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3031 hash ^= (hash >> 16);
3032 hash ^= (hash >> 8);
3033
3034 return hash % count;
3035 }
3036
3037 /*-------------------------- Device entry points ----------------------------*/
3038
3039 static void bond_work_init_all(struct bonding *bond)
3040 {
3041 INIT_DELAYED_WORK(&bond->mcast_work,
3042 bond_resend_igmp_join_requests_delayed);
3043 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3044 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3045 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3046 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3047 else
3048 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3049 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3050 }
3051
3052 static void bond_work_cancel_all(struct bonding *bond)
3053 {
3054 cancel_delayed_work_sync(&bond->mii_work);
3055 cancel_delayed_work_sync(&bond->arp_work);
3056 cancel_delayed_work_sync(&bond->alb_work);
3057 cancel_delayed_work_sync(&bond->ad_work);
3058 cancel_delayed_work_sync(&bond->mcast_work);
3059 }
3060
3061 static int bond_open(struct net_device *bond_dev)
3062 {
3063 struct bonding *bond = netdev_priv(bond_dev);
3064 struct list_head *iter;
3065 struct slave *slave;
3066
3067 /* reset slave->backup and slave->inactive */
3068 read_lock(&bond->lock);
3069 if (bond_has_slaves(bond)) {
3070 read_lock(&bond->curr_slave_lock);
3071 bond_for_each_slave(bond, slave, iter) {
3072 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3073 && (slave != bond->curr_active_slave)) {
3074 bond_set_slave_inactive_flags(slave);
3075 } else {
3076 bond_set_slave_active_flags(slave);
3077 }
3078 }
3079 read_unlock(&bond->curr_slave_lock);
3080 }
3081 read_unlock(&bond->lock);
3082
3083 bond_work_init_all(bond);
3084
3085 if (bond_is_lb(bond)) {
3086 /* bond_alb_initialize must be called before the timer
3087 * is started.
3088 */
3089 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3090 return -ENOMEM;
3091 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3092 }
3093
3094 if (bond->params.miimon) /* link check interval, in milliseconds. */
3095 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3096
3097 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3098 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3099 if (bond->params.arp_validate)
3100 bond->recv_probe = bond_arp_rcv;
3101 }
3102
3103 if (bond->params.mode == BOND_MODE_8023AD) {
3104 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3105 /* register to receive LACPDUs */
3106 bond->recv_probe = bond_3ad_lacpdu_recv;
3107 bond_3ad_initiate_agg_selection(bond, 1);
3108 }
3109
3110 return 0;
3111 }
3112
3113 static int bond_close(struct net_device *bond_dev)
3114 {
3115 struct bonding *bond = netdev_priv(bond_dev);
3116
3117 bond_work_cancel_all(bond);
3118 bond->send_peer_notif = 0;
3119 if (bond_is_lb(bond))
3120 bond_alb_deinitialize(bond);
3121 bond->recv_probe = NULL;
3122
3123 return 0;
3124 }
3125
3126 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3127 struct rtnl_link_stats64 *stats)
3128 {
3129 struct bonding *bond = netdev_priv(bond_dev);
3130 struct rtnl_link_stats64 temp;
3131 struct list_head *iter;
3132 struct slave *slave;
3133
3134 memset(stats, 0, sizeof(*stats));
3135
3136 read_lock_bh(&bond->lock);
3137 bond_for_each_slave(bond, slave, iter) {
3138 const struct rtnl_link_stats64 *sstats =
3139 dev_get_stats(slave->dev, &temp);
3140
3141 stats->rx_packets += sstats->rx_packets;
3142 stats->rx_bytes += sstats->rx_bytes;
3143 stats->rx_errors += sstats->rx_errors;
3144 stats->rx_dropped += sstats->rx_dropped;
3145
3146 stats->tx_packets += sstats->tx_packets;
3147 stats->tx_bytes += sstats->tx_bytes;
3148 stats->tx_errors += sstats->tx_errors;
3149 stats->tx_dropped += sstats->tx_dropped;
3150
3151 stats->multicast += sstats->multicast;
3152 stats->collisions += sstats->collisions;
3153
3154 stats->rx_length_errors += sstats->rx_length_errors;
3155 stats->rx_over_errors += sstats->rx_over_errors;
3156 stats->rx_crc_errors += sstats->rx_crc_errors;
3157 stats->rx_frame_errors += sstats->rx_frame_errors;
3158 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3159 stats->rx_missed_errors += sstats->rx_missed_errors;
3160
3161 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3162 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3163 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3164 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3165 stats->tx_window_errors += sstats->tx_window_errors;
3166 }
3167 read_unlock_bh(&bond->lock);
3168
3169 return stats;
3170 }
3171
3172 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3173 {
3174 struct bonding *bond = netdev_priv(bond_dev);
3175 struct net_device *slave_dev = NULL;
3176 struct ifbond k_binfo;
3177 struct ifbond __user *u_binfo = NULL;
3178 struct ifslave k_sinfo;
3179 struct ifslave __user *u_sinfo = NULL;
3180 struct mii_ioctl_data *mii = NULL;
3181 struct net *net;
3182 int res = 0;
3183
3184 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3185
3186 switch (cmd) {
3187 case SIOCGMIIPHY:
3188 mii = if_mii(ifr);
3189 if (!mii)
3190 return -EINVAL;
3191
3192 mii->phy_id = 0;
3193 /* Fall Through */
3194 case SIOCGMIIREG:
3195 /*
3196 * We do this again just in case we were called by SIOCGMIIREG
3197 * instead of SIOCGMIIPHY.
3198 */
3199 mii = if_mii(ifr);
3200 if (!mii)
3201 return -EINVAL;
3202
3203
3204 if (mii->reg_num == 1) {
3205 mii->val_out = 0;
3206 read_lock(&bond->lock);
3207 read_lock(&bond->curr_slave_lock);
3208 if (netif_carrier_ok(bond->dev))
3209 mii->val_out = BMSR_LSTATUS;
3210
3211 read_unlock(&bond->curr_slave_lock);
3212 read_unlock(&bond->lock);
3213 }
3214
3215 return 0;
3216 case BOND_INFO_QUERY_OLD:
3217 case SIOCBONDINFOQUERY:
3218 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3219
3220 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3221 return -EFAULT;
3222
3223 res = bond_info_query(bond_dev, &k_binfo);
3224 if (res == 0 &&
3225 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3226 return -EFAULT;
3227
3228 return res;
3229 case BOND_SLAVE_INFO_QUERY_OLD:
3230 case SIOCBONDSLAVEINFOQUERY:
3231 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3232
3233 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3234 return -EFAULT;
3235
3236 res = bond_slave_info_query(bond_dev, &k_sinfo);
3237 if (res == 0 &&
3238 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3239 return -EFAULT;
3240
3241 return res;
3242 default:
3243 /* Go on */
3244 break;
3245 }
3246
3247 net = dev_net(bond_dev);
3248
3249 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3250 return -EPERM;
3251
3252 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3253
3254 pr_debug("slave_dev=%p:\n", slave_dev);
3255
3256 if (!slave_dev)
3257 res = -ENODEV;
3258 else {
3259 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3260 switch (cmd) {
3261 case BOND_ENSLAVE_OLD:
3262 case SIOCBONDENSLAVE:
3263 res = bond_enslave(bond_dev, slave_dev);
3264 break;
3265 case BOND_RELEASE_OLD:
3266 case SIOCBONDRELEASE:
3267 res = bond_release(bond_dev, slave_dev);
3268 break;
3269 case BOND_SETHWADDR_OLD:
3270 case SIOCBONDSETHWADDR:
3271 bond_set_dev_addr(bond_dev, slave_dev);
3272 res = 0;
3273 break;
3274 case BOND_CHANGE_ACTIVE_OLD:
3275 case SIOCBONDCHANGEACTIVE:
3276 res = bond_option_active_slave_set(bond, slave_dev);
3277 break;
3278 default:
3279 res = -EOPNOTSUPP;
3280 }
3281
3282 dev_put(slave_dev);
3283 }
3284
3285 return res;
3286 }
3287
3288 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3289 {
3290 struct bonding *bond = netdev_priv(bond_dev);
3291
3292 if (change & IFF_PROMISC)
3293 bond_set_promiscuity(bond,
3294 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3295
3296 if (change & IFF_ALLMULTI)
3297 bond_set_allmulti(bond,
3298 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3299 }
3300
3301 static void bond_set_rx_mode(struct net_device *bond_dev)
3302 {
3303 struct bonding *bond = netdev_priv(bond_dev);
3304 struct list_head *iter;
3305 struct slave *slave;
3306
3307
3308 rcu_read_lock();
3309 if (USES_PRIMARY(bond->params.mode)) {
3310 slave = rcu_dereference(bond->curr_active_slave);
3311 if (slave) {
3312 dev_uc_sync(slave->dev, bond_dev);
3313 dev_mc_sync(slave->dev, bond_dev);
3314 }
3315 } else {
3316 bond_for_each_slave_rcu(bond, slave, iter) {
3317 dev_uc_sync_multiple(slave->dev, bond_dev);
3318 dev_mc_sync_multiple(slave->dev, bond_dev);
3319 }
3320 }
3321 rcu_read_unlock();
3322 }
3323
3324 static int bond_neigh_init(struct neighbour *n)
3325 {
3326 struct bonding *bond = netdev_priv(n->dev);
3327 const struct net_device_ops *slave_ops;
3328 struct neigh_parms parms;
3329 struct slave *slave;
3330 int ret;
3331
3332 slave = bond_first_slave(bond);
3333 if (!slave)
3334 return 0;
3335 slave_ops = slave->dev->netdev_ops;
3336 if (!slave_ops->ndo_neigh_setup)
3337 return 0;
3338
3339 parms.neigh_setup = NULL;
3340 parms.neigh_cleanup = NULL;
3341 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3342 if (ret)
3343 return ret;
3344
3345 /*
3346 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3347 * after the last slave has been detached. Assumes that all slaves
3348 * utilize the same neigh_cleanup (true at this writing as only user
3349 * is ipoib).
3350 */
3351 n->parms->neigh_cleanup = parms.neigh_cleanup;
3352
3353 if (!parms.neigh_setup)
3354 return 0;
3355
3356 return parms.neigh_setup(n);
3357 }
3358
3359 /*
3360 * The bonding ndo_neigh_setup is called at init time beofre any
3361 * slave exists. So we must declare proxy setup function which will
3362 * be used at run time to resolve the actual slave neigh param setup.
3363 *
3364 * It's also called by master devices (such as vlans) to setup their
3365 * underlying devices. In that case - do nothing, we're already set up from
3366 * our init.
3367 */
3368 static int bond_neigh_setup(struct net_device *dev,
3369 struct neigh_parms *parms)
3370 {
3371 /* modify only our neigh_parms */
3372 if (parms->dev == dev)
3373 parms->neigh_setup = bond_neigh_init;
3374
3375 return 0;
3376 }
3377
3378 /*
3379 * Change the MTU of all of a master's slaves to match the master
3380 */
3381 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3382 {
3383 struct bonding *bond = netdev_priv(bond_dev);
3384 struct slave *slave, *rollback_slave;
3385 struct list_head *iter;
3386 int res = 0;
3387
3388 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3389 (bond_dev ? bond_dev->name : "None"), new_mtu);
3390
3391 /* Can't hold bond->lock with bh disabled here since
3392 * some base drivers panic. On the other hand we can't
3393 * hold bond->lock without bh disabled because we'll
3394 * deadlock. The only solution is to rely on the fact
3395 * that we're under rtnl_lock here, and the slaves
3396 * list won't change. This doesn't solve the problem
3397 * of setting the slave's MTU while it is
3398 * transmitting, but the assumption is that the base
3399 * driver can handle that.
3400 *
3401 * TODO: figure out a way to safely iterate the slaves
3402 * list, but without holding a lock around the actual
3403 * call to the base driver.
3404 */
3405
3406 bond_for_each_slave(bond, slave, iter) {
3407 pr_debug("s %p c_m %p\n",
3408 slave,
3409 slave->dev->netdev_ops->ndo_change_mtu);
3410
3411 res = dev_set_mtu(slave->dev, new_mtu);
3412
3413 if (res) {
3414 /* If we failed to set the slave's mtu to the new value
3415 * we must abort the operation even in ACTIVE_BACKUP
3416 * mode, because if we allow the backup slaves to have
3417 * different mtu values than the active slave we'll
3418 * need to change their mtu when doing a failover. That
3419 * means changing their mtu from timer context, which
3420 * is probably not a good idea.
3421 */
3422 pr_debug("err %d %s\n", res, slave->dev->name);
3423 goto unwind;
3424 }
3425 }
3426
3427 bond_dev->mtu = new_mtu;
3428
3429 return 0;
3430
3431 unwind:
3432 /* unwind from head to the slave that failed */
3433 bond_for_each_slave(bond, rollback_slave, iter) {
3434 int tmp_res;
3435
3436 if (rollback_slave == slave)
3437 break;
3438
3439 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3440 if (tmp_res) {
3441 pr_debug("unwind err %d dev %s\n",
3442 tmp_res, rollback_slave->dev->name);
3443 }
3444 }
3445
3446 return res;
3447 }
3448
3449 /*
3450 * Change HW address
3451 *
3452 * Note that many devices must be down to change the HW address, and
3453 * downing the master releases all slaves. We can make bonds full of
3454 * bonding devices to test this, however.
3455 */
3456 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3457 {
3458 struct bonding *bond = netdev_priv(bond_dev);
3459 struct slave *slave, *rollback_slave;
3460 struct sockaddr *sa = addr, tmp_sa;
3461 struct list_head *iter;
3462 int res = 0;
3463
3464 if (bond->params.mode == BOND_MODE_ALB)
3465 return bond_alb_set_mac_address(bond_dev, addr);
3466
3467
3468 pr_debug("bond=%p, name=%s\n",
3469 bond, bond_dev ? bond_dev->name : "None");
3470
3471 /* If fail_over_mac is enabled, do nothing and return success.
3472 * Returning an error causes ifenslave to fail.
3473 */
3474 if (bond->params.fail_over_mac)
3475 return 0;
3476
3477 if (!is_valid_ether_addr(sa->sa_data))
3478 return -EADDRNOTAVAIL;
3479
3480 /* Can't hold bond->lock with bh disabled here since
3481 * some base drivers panic. On the other hand we can't
3482 * hold bond->lock without bh disabled because we'll
3483 * deadlock. The only solution is to rely on the fact
3484 * that we're under rtnl_lock here, and the slaves
3485 * list won't change. This doesn't solve the problem
3486 * of setting the slave's hw address while it is
3487 * transmitting, but the assumption is that the base
3488 * driver can handle that.
3489 *
3490 * TODO: figure out a way to safely iterate the slaves
3491 * list, but without holding a lock around the actual
3492 * call to the base driver.
3493 */
3494
3495 bond_for_each_slave(bond, slave, iter) {
3496 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3497 pr_debug("slave %p %s\n", slave, slave->dev->name);
3498
3499 if (slave_ops->ndo_set_mac_address == NULL) {
3500 res = -EOPNOTSUPP;
3501 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3502 goto unwind;
3503 }
3504
3505 res = dev_set_mac_address(slave->dev, addr);
3506 if (res) {
3507 /* TODO: consider downing the slave
3508 * and retry ?
3509 * User should expect communications
3510 * breakage anyway until ARP finish
3511 * updating, so...
3512 */
3513 pr_debug("err %d %s\n", res, slave->dev->name);
3514 goto unwind;
3515 }
3516 }
3517
3518 /* success */
3519 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3520 return 0;
3521
3522 unwind:
3523 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3524 tmp_sa.sa_family = bond_dev->type;
3525
3526 /* unwind from head to the slave that failed */
3527 bond_for_each_slave(bond, rollback_slave, iter) {
3528 int tmp_res;
3529
3530 if (rollback_slave == slave)
3531 break;
3532
3533 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3534 if (tmp_res) {
3535 pr_debug("unwind err %d dev %s\n",
3536 tmp_res, rollback_slave->dev->name);
3537 }
3538 }
3539
3540 return res;
3541 }
3542
3543 /**
3544 * bond_xmit_slave_id - transmit skb through slave with slave_id
3545 * @bond: bonding device that is transmitting
3546 * @skb: buffer to transmit
3547 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3548 *
3549 * This function tries to transmit through slave with slave_id but in case
3550 * it fails, it tries to find the first available slave for transmission.
3551 * The skb is consumed in all cases, thus the function is void.
3552 */
3553 void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3554 {
3555 struct list_head *iter;
3556 struct slave *slave;
3557 int i = slave_id;
3558
3559 /* Here we start from the slave with slave_id */
3560 bond_for_each_slave_rcu(bond, slave, iter) {
3561 if (--i < 0) {
3562 if (slave_can_tx(slave)) {
3563 bond_dev_queue_xmit(bond, skb, slave->dev);
3564 return;
3565 }
3566 }
3567 }
3568
3569 /* Here we start from the first slave up to slave_id */
3570 i = slave_id;
3571 bond_for_each_slave_rcu(bond, slave, iter) {
3572 if (--i < 0)
3573 break;
3574 if (slave_can_tx(slave)) {
3575 bond_dev_queue_xmit(bond, skb, slave->dev);
3576 return;
3577 }
3578 }
3579 /* no slave that can tx has been found */
3580 kfree_skb(skb);
3581 }
3582
3583 /**
3584 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3585 * @bond: bonding device to use
3586 *
3587 * Based on the value of the bonding device's packets_per_slave parameter
3588 * this function generates a slave id, which is usually used as the next
3589 * slave to transmit through.
3590 */
3591 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3592 {
3593 int packets_per_slave = bond->params.packets_per_slave;
3594 u32 slave_id;
3595
3596 switch (packets_per_slave) {
3597 case 0:
3598 slave_id = prandom_u32();
3599 break;
3600 case 1:
3601 slave_id = bond->rr_tx_counter;
3602 break;
3603 default:
3604 slave_id = reciprocal_divide(bond->rr_tx_counter,
3605 packets_per_slave);
3606 break;
3607 }
3608 bond->rr_tx_counter++;
3609
3610 return slave_id;
3611 }
3612
3613 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3614 {
3615 struct bonding *bond = netdev_priv(bond_dev);
3616 struct iphdr *iph = ip_hdr(skb);
3617 struct slave *slave;
3618 u32 slave_id;
3619
3620 /* Start with the curr_active_slave that joined the bond as the
3621 * default for sending IGMP traffic. For failover purposes one
3622 * needs to maintain some consistency for the interface that will
3623 * send the join/membership reports. The curr_active_slave found
3624 * will send all of this type of traffic.
3625 */
3626 if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3627 slave = rcu_dereference(bond->curr_active_slave);
3628 if (slave && slave_can_tx(slave))
3629 bond_dev_queue_xmit(bond, skb, slave->dev);
3630 else
3631 bond_xmit_slave_id(bond, skb, 0);
3632 } else {
3633 slave_id = bond_rr_gen_slave_id(bond);
3634 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3635 }
3636
3637 return NETDEV_TX_OK;
3638 }
3639
3640 /*
3641 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3642 * the bond has a usable interface.
3643 */
3644 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3645 {
3646 struct bonding *bond = netdev_priv(bond_dev);
3647 struct slave *slave;
3648
3649 slave = rcu_dereference(bond->curr_active_slave);
3650 if (slave)
3651 bond_dev_queue_xmit(bond, skb, slave->dev);
3652 else
3653 kfree_skb(skb);
3654
3655 return NETDEV_TX_OK;
3656 }
3657
3658 /* In bond_xmit_xor() , we determine the output device by using a pre-
3659 * determined xmit_hash_policy(), If the selected device is not enabled,
3660 * find the next active slave.
3661 */
3662 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3663 {
3664 struct bonding *bond = netdev_priv(bond_dev);
3665
3666 bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb, bond->slave_cnt));
3667
3668 return NETDEV_TX_OK;
3669 }
3670
3671 /* in broadcast mode, we send everything to all usable interfaces. */
3672 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3673 {
3674 struct bonding *bond = netdev_priv(bond_dev);
3675 struct slave *slave = NULL;
3676 struct list_head *iter;
3677
3678 bond_for_each_slave_rcu(bond, slave, iter) {
3679 if (bond_is_last_slave(bond, slave))
3680 break;
3681 if (IS_UP(slave->dev) && slave->link == BOND_LINK_UP) {
3682 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3683
3684 if (!skb2) {
3685 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
3686 bond_dev->name);
3687 continue;
3688 }
3689 /* bond_dev_queue_xmit always returns 0 */
3690 bond_dev_queue_xmit(bond, skb2, slave->dev);
3691 }
3692 }
3693 if (slave && IS_UP(slave->dev) && slave->link == BOND_LINK_UP)
3694 bond_dev_queue_xmit(bond, skb, slave->dev);
3695 else
3696 kfree_skb(skb);
3697
3698 return NETDEV_TX_OK;
3699 }
3700
3701 /*------------------------- Device initialization ---------------------------*/
3702
3703 /*
3704 * Lookup the slave that corresponds to a qid
3705 */
3706 static inline int bond_slave_override(struct bonding *bond,
3707 struct sk_buff *skb)
3708 {
3709 struct slave *slave = NULL;
3710 struct slave *check_slave;
3711 struct list_head *iter;
3712 int res = 1;
3713
3714 if (!skb->queue_mapping)
3715 return 1;
3716
3717 /* Find out if any slaves have the same mapping as this skb. */
3718 bond_for_each_slave_rcu(bond, check_slave, iter) {
3719 if (check_slave->queue_id == skb->queue_mapping) {
3720 slave = check_slave;
3721 break;
3722 }
3723 }
3724
3725 /* If the slave isn't UP, use default transmit policy. */
3726 if (slave && slave->queue_id && IS_UP(slave->dev) &&
3727 (slave->link == BOND_LINK_UP)) {
3728 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3729 }
3730
3731 return res;
3732 }
3733
3734
3735 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
3736 {
3737 /*
3738 * This helper function exists to help dev_pick_tx get the correct
3739 * destination queue. Using a helper function skips a call to
3740 * skb_tx_hash and will put the skbs in the queue we expect on their
3741 * way down to the bonding driver.
3742 */
3743 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3744
3745 /*
3746 * Save the original txq to restore before passing to the driver
3747 */
3748 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3749
3750 if (unlikely(txq >= dev->real_num_tx_queues)) {
3751 do {
3752 txq -= dev->real_num_tx_queues;
3753 } while (txq >= dev->real_num_tx_queues);
3754 }
3755 return txq;
3756 }
3757
3758 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3759 {
3760 struct bonding *bond = netdev_priv(dev);
3761
3762 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
3763 if (!bond_slave_override(bond, skb))
3764 return NETDEV_TX_OK;
3765 }
3766
3767 switch (bond->params.mode) {
3768 case BOND_MODE_ROUNDROBIN:
3769 return bond_xmit_roundrobin(skb, dev);
3770 case BOND_MODE_ACTIVEBACKUP:
3771 return bond_xmit_activebackup(skb, dev);
3772 case BOND_MODE_XOR:
3773 return bond_xmit_xor(skb, dev);
3774 case BOND_MODE_BROADCAST:
3775 return bond_xmit_broadcast(skb, dev);
3776 case BOND_MODE_8023AD:
3777 return bond_3ad_xmit_xor(skb, dev);
3778 case BOND_MODE_ALB:
3779 case BOND_MODE_TLB:
3780 return bond_alb_xmit(skb, dev);
3781 default:
3782 /* Should never happen, mode already checked */
3783 pr_err("%s: Error: Unknown bonding mode %d\n",
3784 dev->name, bond->params.mode);
3785 WARN_ON_ONCE(1);
3786 kfree_skb(skb);
3787 return NETDEV_TX_OK;
3788 }
3789 }
3790
3791 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3792 {
3793 struct bonding *bond = netdev_priv(dev);
3794 netdev_tx_t ret = NETDEV_TX_OK;
3795
3796 /*
3797 * If we risk deadlock from transmitting this in the
3798 * netpoll path, tell netpoll to queue the frame for later tx
3799 */
3800 if (is_netpoll_tx_blocked(dev))
3801 return NETDEV_TX_BUSY;
3802
3803 rcu_read_lock();
3804 if (bond_has_slaves(bond))
3805 ret = __bond_start_xmit(skb, dev);
3806 else
3807 kfree_skb(skb);
3808 rcu_read_unlock();
3809
3810 return ret;
3811 }
3812
3813 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3814 struct ethtool_cmd *ecmd)
3815 {
3816 struct bonding *bond = netdev_priv(bond_dev);
3817 unsigned long speed = 0;
3818 struct list_head *iter;
3819 struct slave *slave;
3820
3821 ecmd->duplex = DUPLEX_UNKNOWN;
3822 ecmd->port = PORT_OTHER;
3823
3824 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
3825 * do not need to check mode. Though link speed might not represent
3826 * the true receive or transmit bandwidth (not all modes are symmetric)
3827 * this is an accurate maximum.
3828 */
3829 read_lock(&bond->lock);
3830 bond_for_each_slave(bond, slave, iter) {
3831 if (SLAVE_IS_OK(slave)) {
3832 if (slave->speed != SPEED_UNKNOWN)
3833 speed += slave->speed;
3834 if (ecmd->duplex == DUPLEX_UNKNOWN &&
3835 slave->duplex != DUPLEX_UNKNOWN)
3836 ecmd->duplex = slave->duplex;
3837 }
3838 }
3839 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3840 read_unlock(&bond->lock);
3841
3842 return 0;
3843 }
3844
3845 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3846 struct ethtool_drvinfo *drvinfo)
3847 {
3848 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3849 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3850 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3851 BOND_ABI_VERSION);
3852 }
3853
3854 static const struct ethtool_ops bond_ethtool_ops = {
3855 .get_drvinfo = bond_ethtool_get_drvinfo,
3856 .get_settings = bond_ethtool_get_settings,
3857 .get_link = ethtool_op_get_link,
3858 };
3859
3860 static const struct net_device_ops bond_netdev_ops = {
3861 .ndo_init = bond_init,
3862 .ndo_uninit = bond_uninit,
3863 .ndo_open = bond_open,
3864 .ndo_stop = bond_close,
3865 .ndo_start_xmit = bond_start_xmit,
3866 .ndo_select_queue = bond_select_queue,
3867 .ndo_get_stats64 = bond_get_stats,
3868 .ndo_do_ioctl = bond_do_ioctl,
3869 .ndo_change_rx_flags = bond_change_rx_flags,
3870 .ndo_set_rx_mode = bond_set_rx_mode,
3871 .ndo_change_mtu = bond_change_mtu,
3872 .ndo_set_mac_address = bond_set_mac_address,
3873 .ndo_neigh_setup = bond_neigh_setup,
3874 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
3875 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
3876 #ifdef CONFIG_NET_POLL_CONTROLLER
3877 .ndo_netpoll_setup = bond_netpoll_setup,
3878 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
3879 .ndo_poll_controller = bond_poll_controller,
3880 #endif
3881 .ndo_add_slave = bond_enslave,
3882 .ndo_del_slave = bond_release,
3883 .ndo_fix_features = bond_fix_features,
3884 };
3885
3886 static const struct device_type bond_type = {
3887 .name = "bond",
3888 };
3889
3890 static void bond_destructor(struct net_device *bond_dev)
3891 {
3892 struct bonding *bond = netdev_priv(bond_dev);
3893 if (bond->wq)
3894 destroy_workqueue(bond->wq);
3895 free_netdev(bond_dev);
3896 }
3897
3898 void bond_setup(struct net_device *bond_dev)
3899 {
3900 struct bonding *bond = netdev_priv(bond_dev);
3901
3902 /* initialize rwlocks */
3903 rwlock_init(&bond->lock);
3904 rwlock_init(&bond->curr_slave_lock);
3905 bond->params = bonding_defaults;
3906
3907 /* Initialize pointers */
3908 bond->dev = bond_dev;
3909
3910 /* Initialize the device entry points */
3911 ether_setup(bond_dev);
3912 bond_dev->netdev_ops = &bond_netdev_ops;
3913 bond_dev->ethtool_ops = &bond_ethtool_ops;
3914
3915 bond_dev->destructor = bond_destructor;
3916
3917 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3918
3919 /* Initialize the device options */
3920 bond_dev->tx_queue_len = 0;
3921 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3922 bond_dev->priv_flags |= IFF_BONDING;
3923 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3924
3925 /* At first, we block adding VLANs. That's the only way to
3926 * prevent problems that occur when adding VLANs over an
3927 * empty bond. The block will be removed once non-challenged
3928 * slaves are enslaved.
3929 */
3930 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
3931
3932 /* don't acquire bond device's netif_tx_lock when
3933 * transmitting */
3934 bond_dev->features |= NETIF_F_LLTX;
3935
3936 /* By default, we declare the bond to be fully
3937 * VLAN hardware accelerated capable. Special
3938 * care is taken in the various xmit functions
3939 * when there are slaves that are not hw accel
3940 * capable
3941 */
3942
3943 bond_dev->hw_features = BOND_VLAN_FEATURES |
3944 NETIF_F_HW_VLAN_CTAG_TX |
3945 NETIF_F_HW_VLAN_CTAG_RX |
3946 NETIF_F_HW_VLAN_CTAG_FILTER;
3947
3948 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3949 bond_dev->features |= bond_dev->hw_features;
3950 }
3951
3952 /*
3953 * Destroy a bonding device.
3954 * Must be under rtnl_lock when this function is called.
3955 */
3956 static void bond_uninit(struct net_device *bond_dev)
3957 {
3958 struct bonding *bond = netdev_priv(bond_dev);
3959 struct list_head *iter;
3960 struct slave *slave;
3961
3962 bond_netpoll_cleanup(bond_dev);
3963
3964 /* Release the bonded slaves */
3965 bond_for_each_slave(bond, slave, iter)
3966 __bond_release_one(bond_dev, slave->dev, true);
3967 pr_info("%s: released all slaves\n", bond_dev->name);
3968
3969 list_del(&bond->bond_list);
3970
3971 bond_debug_unregister(bond);
3972 }
3973
3974 /*------------------------- Module initialization ---------------------------*/
3975
3976 /*
3977 * Convert string input module parms. Accept either the
3978 * number of the mode or its string name. A bit complicated because
3979 * some mode names are substrings of other names, and calls from sysfs
3980 * may have whitespace in the name (trailing newlines, for example).
3981 */
3982 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
3983 {
3984 int modeint = -1, i, rv;
3985 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
3986
3987 for (p = (char *)buf; *p; p++)
3988 if (!(isdigit(*p) || isspace(*p)))
3989 break;
3990
3991 if (*p)
3992 rv = sscanf(buf, "%20s", modestr);
3993 else
3994 rv = sscanf(buf, "%d", &modeint);
3995
3996 if (!rv)
3997 return -1;
3998
3999 for (i = 0; tbl[i].modename; i++) {
4000 if (modeint == tbl[i].mode)
4001 return tbl[i].mode;
4002 if (strcmp(modestr, tbl[i].modename) == 0)
4003 return tbl[i].mode;
4004 }
4005
4006 return -1;
4007 }
4008
4009 static int bond_check_params(struct bond_params *params)
4010 {
4011 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4012 int arp_all_targets_value;
4013
4014 /*
4015 * Convert string parameters.
4016 */
4017 if (mode) {
4018 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4019 if (bond_mode == -1) {
4020 pr_err("Error: Invalid bonding mode \"%s\"\n",
4021 mode == NULL ? "NULL" : mode);
4022 return -EINVAL;
4023 }
4024 }
4025
4026 if (xmit_hash_policy) {
4027 if ((bond_mode != BOND_MODE_XOR) &&
4028 (bond_mode != BOND_MODE_8023AD)) {
4029 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4030 bond_mode_name(bond_mode));
4031 } else {
4032 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4033 xmit_hashtype_tbl);
4034 if (xmit_hashtype == -1) {
4035 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4036 xmit_hash_policy == NULL ? "NULL" :
4037 xmit_hash_policy);
4038 return -EINVAL;
4039 }
4040 }
4041 }
4042
4043 if (lacp_rate) {
4044 if (bond_mode != BOND_MODE_8023AD) {
4045 pr_info("lacp_rate param is irrelevant in mode %s\n",
4046 bond_mode_name(bond_mode));
4047 } else {
4048 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4049 if (lacp_fast == -1) {
4050 pr_err("Error: Invalid lacp rate \"%s\"\n",
4051 lacp_rate == NULL ? "NULL" : lacp_rate);
4052 return -EINVAL;
4053 }
4054 }
4055 }
4056
4057 if (ad_select) {
4058 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4059 if (params->ad_select == -1) {
4060 pr_err("Error: Invalid ad_select \"%s\"\n",
4061 ad_select == NULL ? "NULL" : ad_select);
4062 return -EINVAL;
4063 }
4064
4065 if (bond_mode != BOND_MODE_8023AD) {
4066 pr_warning("ad_select param only affects 802.3ad mode\n");
4067 }
4068 } else {
4069 params->ad_select = BOND_AD_STABLE;
4070 }
4071
4072 if (max_bonds < 0) {
4073 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4074 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4075 max_bonds = BOND_DEFAULT_MAX_BONDS;
4076 }
4077
4078 if (miimon < 0) {
4079 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4080 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4081 miimon = BOND_LINK_MON_INTERV;
4082 }
4083
4084 if (updelay < 0) {
4085 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4086 updelay, INT_MAX);
4087 updelay = 0;
4088 }
4089
4090 if (downdelay < 0) {
4091 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4092 downdelay, INT_MAX);
4093 downdelay = 0;
4094 }
4095
4096 if ((use_carrier != 0) && (use_carrier != 1)) {
4097 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4098 use_carrier);
4099 use_carrier = 1;
4100 }
4101
4102 if (num_peer_notif < 0 || num_peer_notif > 255) {
4103 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4104 num_peer_notif);
4105 num_peer_notif = 1;
4106 }
4107
4108 /* reset values for 802.3ad */
4109 if (bond_mode == BOND_MODE_8023AD) {
4110 if (!miimon) {
4111 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4112 pr_warning("Forcing miimon to 100msec\n");
4113 miimon = BOND_DEFAULT_MIIMON;
4114 }
4115 }
4116
4117 if (tx_queues < 1 || tx_queues > 255) {
4118 pr_warning("Warning: tx_queues (%d) should be between "
4119 "1 and 255, resetting to %d\n",
4120 tx_queues, BOND_DEFAULT_TX_QUEUES);
4121 tx_queues = BOND_DEFAULT_TX_QUEUES;
4122 }
4123
4124 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4125 pr_warning("Warning: all_slaves_active module parameter (%d), "
4126 "not of valid value (0/1), so it was set to "
4127 "0\n", all_slaves_active);
4128 all_slaves_active = 0;
4129 }
4130
4131 if (resend_igmp < 0 || resend_igmp > 255) {
4132 pr_warning("Warning: resend_igmp (%d) should be between "
4133 "0 and 255, resetting to %d\n",
4134 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4135 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4136 }
4137
4138 if (packets_per_slave < 0 || packets_per_slave > USHRT_MAX) {
4139 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4140 packets_per_slave, USHRT_MAX);
4141 packets_per_slave = 1;
4142 }
4143
4144 /* reset values for TLB/ALB */
4145 if ((bond_mode == BOND_MODE_TLB) ||
4146 (bond_mode == BOND_MODE_ALB)) {
4147 if (!miimon) {
4148 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4149 pr_warning("Forcing miimon to 100msec\n");
4150 miimon = BOND_DEFAULT_MIIMON;
4151 }
4152 }
4153
4154 if (bond_mode == BOND_MODE_ALB) {
4155 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",
4156 updelay);
4157 }
4158
4159 if (!miimon) {
4160 if (updelay || downdelay) {
4161 /* just warn the user the up/down delay will have
4162 * no effect since miimon is zero...
4163 */
4164 pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4165 updelay, downdelay);
4166 }
4167 } else {
4168 /* don't allow arp monitoring */
4169 if (arp_interval) {
4170 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4171 miimon, arp_interval);
4172 arp_interval = 0;
4173 }
4174
4175 if ((updelay % miimon) != 0) {
4176 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4177 updelay, miimon,
4178 (updelay / miimon) * miimon);
4179 }
4180
4181 updelay /= miimon;
4182
4183 if ((downdelay % miimon) != 0) {
4184 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4185 downdelay, miimon,
4186 (downdelay / miimon) * miimon);
4187 }
4188
4189 downdelay /= miimon;
4190 }
4191
4192 if (arp_interval < 0) {
4193 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4194 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4195 arp_interval = BOND_LINK_ARP_INTERV;
4196 }
4197
4198 for (arp_ip_count = 0, i = 0;
4199 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4200 /* not complete check, but should be good enough to
4201 catch mistakes */
4202 __be32 ip = in_aton(arp_ip_target[i]);
4203 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4204 ip == htonl(INADDR_BROADCAST)) {
4205 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4206 arp_ip_target[i]);
4207 arp_interval = 0;
4208 } else {
4209 if (bond_get_targets_ip(arp_target, ip) == -1)
4210 arp_target[arp_ip_count++] = ip;
4211 else
4212 pr_warning("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4213 &ip);
4214 }
4215 }
4216
4217 if (arp_interval && !arp_ip_count) {
4218 /* don't allow arping if no arp_ip_target given... */
4219 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4220 arp_interval);
4221 arp_interval = 0;
4222 }
4223
4224 if (arp_validate) {
4225 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4226 pr_err("arp_validate only supported in active-backup mode\n");
4227 return -EINVAL;
4228 }
4229 if (!arp_interval) {
4230 pr_err("arp_validate requires arp_interval\n");
4231 return -EINVAL;
4232 }
4233
4234 arp_validate_value = bond_parse_parm(arp_validate,
4235 arp_validate_tbl);
4236 if (arp_validate_value == -1) {
4237 pr_err("Error: invalid arp_validate \"%s\"\n",
4238 arp_validate == NULL ? "NULL" : arp_validate);
4239 return -EINVAL;
4240 }
4241 } else
4242 arp_validate_value = 0;
4243
4244 arp_all_targets_value = 0;
4245 if (arp_all_targets) {
4246 arp_all_targets_value = bond_parse_parm(arp_all_targets,
4247 arp_all_targets_tbl);
4248
4249 if (arp_all_targets_value == -1) {
4250 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4251 arp_all_targets);
4252 arp_all_targets_value = 0;
4253 }
4254 }
4255
4256 if (miimon) {
4257 pr_info("MII link monitoring set to %d ms\n", miimon);
4258 } else if (arp_interval) {
4259 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4260 arp_interval,
4261 arp_validate_tbl[arp_validate_value].modename,
4262 arp_ip_count);
4263
4264 for (i = 0; i < arp_ip_count; i++)
4265 pr_info(" %s", arp_ip_target[i]);
4266
4267 pr_info("\n");
4268
4269 } else if (max_bonds) {
4270 /* miimon and arp_interval not set, we need one so things
4271 * work as expected, see bonding.txt for details
4272 */
4273 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");
4274 }
4275
4276 if (primary && !USES_PRIMARY(bond_mode)) {
4277 /* currently, using a primary only makes sense
4278 * in active backup, TLB or ALB modes
4279 */
4280 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4281 primary, bond_mode_name(bond_mode));
4282 primary = NULL;
4283 }
4284
4285 if (primary && primary_reselect) {
4286 primary_reselect_value = bond_parse_parm(primary_reselect,
4287 pri_reselect_tbl);
4288 if (primary_reselect_value == -1) {
4289 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4290 primary_reselect ==
4291 NULL ? "NULL" : primary_reselect);
4292 return -EINVAL;
4293 }
4294 } else {
4295 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4296 }
4297
4298 if (fail_over_mac) {
4299 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4300 fail_over_mac_tbl);
4301 if (fail_over_mac_value == -1) {
4302 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4303 arp_validate == NULL ? "NULL" : arp_validate);
4304 return -EINVAL;
4305 }
4306
4307 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4308 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4309 } else {
4310 fail_over_mac_value = BOND_FOM_NONE;
4311 }
4312
4313 /* fill params struct with the proper values */
4314 params->mode = bond_mode;
4315 params->xmit_policy = xmit_hashtype;
4316 params->miimon = miimon;
4317 params->num_peer_notif = num_peer_notif;
4318 params->arp_interval = arp_interval;
4319 params->arp_validate = arp_validate_value;
4320 params->arp_all_targets = arp_all_targets_value;
4321 params->updelay = updelay;
4322 params->downdelay = downdelay;
4323 params->use_carrier = use_carrier;
4324 params->lacp_fast = lacp_fast;
4325 params->primary[0] = 0;
4326 params->primary_reselect = primary_reselect_value;
4327 params->fail_over_mac = fail_over_mac_value;
4328 params->tx_queues = tx_queues;
4329 params->all_slaves_active = all_slaves_active;
4330 params->resend_igmp = resend_igmp;
4331 params->min_links = min_links;
4332 params->lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4333 if (packets_per_slave > 1)
4334 params->packets_per_slave = reciprocal_value(packets_per_slave);
4335 else
4336 params->packets_per_slave = packets_per_slave;
4337 if (primary) {
4338 strncpy(params->primary, primary, IFNAMSIZ);
4339 params->primary[IFNAMSIZ - 1] = 0;
4340 }
4341
4342 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4343
4344 return 0;
4345 }
4346
4347 static struct lock_class_key bonding_netdev_xmit_lock_key;
4348 static struct lock_class_key bonding_netdev_addr_lock_key;
4349 static struct lock_class_key bonding_tx_busylock_key;
4350
4351 static void bond_set_lockdep_class_one(struct net_device *dev,
4352 struct netdev_queue *txq,
4353 void *_unused)
4354 {
4355 lockdep_set_class(&txq->_xmit_lock,
4356 &bonding_netdev_xmit_lock_key);
4357 }
4358
4359 static void bond_set_lockdep_class(struct net_device *dev)
4360 {
4361 lockdep_set_class(&dev->addr_list_lock,
4362 &bonding_netdev_addr_lock_key);
4363 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4364 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4365 }
4366
4367 /*
4368 * Called from registration process
4369 */
4370 static int bond_init(struct net_device *bond_dev)
4371 {
4372 struct bonding *bond = netdev_priv(bond_dev);
4373 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4374 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4375
4376 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4377
4378 /*
4379 * Initialize locks that may be required during
4380 * en/deslave operations. All of the bond_open work
4381 * (of which this is part) should really be moved to
4382 * a phase prior to dev_open
4383 */
4384 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4385 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4386
4387 bond->wq = create_singlethread_workqueue(bond_dev->name);
4388 if (!bond->wq)
4389 return -ENOMEM;
4390
4391 bond_set_lockdep_class(bond_dev);
4392
4393 list_add_tail(&bond->bond_list, &bn->dev_list);
4394
4395 bond_prepare_sysfs_group(bond);
4396
4397 bond_debug_register(bond);
4398
4399 /* Ensure valid dev_addr */
4400 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4401 bond_dev->addr_assign_type == NET_ADDR_PERM)
4402 eth_hw_addr_random(bond_dev);
4403
4404 return 0;
4405 }
4406
4407 unsigned int bond_get_num_tx_queues(void)
4408 {
4409 return tx_queues;
4410 }
4411
4412 /* Create a new bond based on the specified name and bonding parameters.
4413 * If name is NULL, obtain a suitable "bond%d" name for us.
4414 * Caller must NOT hold rtnl_lock; we need to release it here before we
4415 * set up our sysfs entries.
4416 */
4417 int bond_create(struct net *net, const char *name)
4418 {
4419 struct net_device *bond_dev;
4420 int res;
4421
4422 rtnl_lock();
4423
4424 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4425 name ? name : "bond%d",
4426 bond_setup, tx_queues);
4427 if (!bond_dev) {
4428 pr_err("%s: eek! can't alloc netdev!\n", name);
4429 rtnl_unlock();
4430 return -ENOMEM;
4431 }
4432
4433 dev_net_set(bond_dev, net);
4434 bond_dev->rtnl_link_ops = &bond_link_ops;
4435
4436 res = register_netdevice(bond_dev);
4437
4438 netif_carrier_off(bond_dev);
4439
4440 rtnl_unlock();
4441 if (res < 0)
4442 bond_destructor(bond_dev);
4443 return res;
4444 }
4445
4446 static int __net_init bond_net_init(struct net *net)
4447 {
4448 struct bond_net *bn = net_generic(net, bond_net_id);
4449
4450 bn->net = net;
4451 INIT_LIST_HEAD(&bn->dev_list);
4452
4453 bond_create_proc_dir(bn);
4454 bond_create_sysfs(bn);
4455
4456 return 0;
4457 }
4458
4459 static void __net_exit bond_net_exit(struct net *net)
4460 {
4461 struct bond_net *bn = net_generic(net, bond_net_id);
4462 struct bonding *bond, *tmp_bond;
4463 LIST_HEAD(list);
4464
4465 bond_destroy_sysfs(bn);
4466 bond_destroy_proc_dir(bn);
4467
4468 /* Kill off any bonds created after unregistering bond rtnl ops */
4469 rtnl_lock();
4470 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4471 unregister_netdevice_queue(bond->dev, &list);
4472 unregister_netdevice_many(&list);
4473 rtnl_unlock();
4474 }
4475
4476 static struct pernet_operations bond_net_ops = {
4477 .init = bond_net_init,
4478 .exit = bond_net_exit,
4479 .id = &bond_net_id,
4480 .size = sizeof(struct bond_net),
4481 };
4482
4483 static int __init bonding_init(void)
4484 {
4485 int i;
4486 int res;
4487
4488 pr_info("%s", bond_version);
4489
4490 res = bond_check_params(&bonding_defaults);
4491 if (res)
4492 goto out;
4493
4494 res = register_pernet_subsys(&bond_net_ops);
4495 if (res)
4496 goto out;
4497
4498 res = bond_netlink_init();
4499 if (res)
4500 goto err_link;
4501
4502 bond_create_debugfs();
4503
4504 for (i = 0; i < max_bonds; i++) {
4505 res = bond_create(&init_net, NULL);
4506 if (res)
4507 goto err;
4508 }
4509
4510 register_netdevice_notifier(&bond_netdev_notifier);
4511 out:
4512 return res;
4513 err:
4514 bond_netlink_fini();
4515 err_link:
4516 unregister_pernet_subsys(&bond_net_ops);
4517 goto out;
4518
4519 }
4520
4521 static void __exit bonding_exit(void)
4522 {
4523 unregister_netdevice_notifier(&bond_netdev_notifier);
4524
4525 bond_destroy_debugfs();
4526
4527 bond_netlink_fini();
4528 unregister_pernet_subsys(&bond_net_ops);
4529
4530 #ifdef CONFIG_NET_POLL_CONTROLLER
4531 /*
4532 * Make sure we don't have an imbalance on our netpoll blocking
4533 */
4534 WARN_ON(atomic_read(&netpoll_block_tx));
4535 #endif
4536 }
4537
4538 module_init(bonding_init);
4539 module_exit(bonding_exit);
4540 MODULE_LICENSE("GPL");
4541 MODULE_VERSION(DRV_VERSION);
4542 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4543 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux kernel - Deliverables
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