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bonding: Fix bonding crash
[GitHub/mt8127/android_kernel_alcatel_ttab.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 "bonding.h"
81 #include "bond_3ad.h"
82 #include "bond_alb.h"
83
84 /*---------------------------- Module parameters ----------------------------*/
85
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV 0
88 #define BOND_LINK_ARP_INTERV 0
89
90 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92 static int num_peer_notif = 1;
93 static int miimon = BOND_LINK_MON_INTERV;
94 static int updelay;
95 static int downdelay;
96 static int use_carrier = 1;
97 static char *mode;
98 static char *primary;
99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval = BOND_LINK_ARP_INTERV;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *fail_over_mac;
108 static int all_slaves_active = 0;
109 static struct bond_params bonding_defaults;
110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
111
112 module_param(max_bonds, int, 0);
113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114 module_param(tx_queues, int, 0);
115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
118 "failover event (alias of num_unsol_na)");
119 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
121 "failover event (alias of num_grat_arp)");
122 module_param(miimon, int, 0);
123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
124 module_param(updelay, int, 0);
125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
126 module_param(downdelay, int, 0);
127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
128 "in milliseconds");
129 module_param(use_carrier, int, 0);
130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
131 "0 for off, 1 for on (default)");
132 module_param(mode, charp, 0);
133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
134 "1 for active-backup, 2 for balance-xor, "
135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
136 "6 for balance-alb");
137 module_param(primary, charp, 0);
138 MODULE_PARM_DESC(primary, "Primary network device to use");
139 module_param(primary_reselect, charp, 0);
140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
141 "once it comes up; "
142 "0 for always (default), "
143 "1 for only if speed of primary is "
144 "better, "
145 "2 for only on active slave "
146 "failure");
147 module_param(lacp_rate, charp, 0);
148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
149 "0 for slow, 1 for fast");
150 module_param(ad_select, charp, 0);
151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
152 "0 for stable (default), 1 for bandwidth, "
153 "2 for count");
154 module_param(min_links, int, 0);
155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
156
157 module_param(xmit_hash_policy, charp, 0);
158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
159 "0 for layer 2 (default), 1 for layer 3+4, "
160 "2 for layer 2+3");
161 module_param(arp_interval, int, 0);
162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
163 module_param_array(arp_ip_target, charp, NULL, 0);
164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
165 module_param(arp_validate, charp, 0);
166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
167 "0 for none (default), 1 for active, "
168 "2 for backup, 3 for all");
169 module_param(fail_over_mac, charp, 0);
170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
171 "the same MAC; 0 for none (default), "
172 "1 for active, 2 for follow");
173 module_param(all_slaves_active, int, 0);
174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
175 "by setting active flag for all slaves; "
176 "0 for never (default), 1 for always.");
177 module_param(resend_igmp, int, 0);
178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
179 "link failure");
180
181 /*----------------------------- Global variables ----------------------------*/
182
183 #ifdef CONFIG_NET_POLL_CONTROLLER
184 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
185 #endif
186
187 int bond_net_id __read_mostly;
188
189 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
190 static int arp_ip_count;
191 static int bond_mode = BOND_MODE_ROUNDROBIN;
192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
193 static int lacp_fast;
194
195 const struct bond_parm_tbl bond_lacp_tbl[] = {
196 { "slow", AD_LACP_SLOW},
197 { "fast", AD_LACP_FAST},
198 { NULL, -1},
199 };
200
201 const struct bond_parm_tbl bond_mode_tbl[] = {
202 { "balance-rr", BOND_MODE_ROUNDROBIN},
203 { "active-backup", BOND_MODE_ACTIVEBACKUP},
204 { "balance-xor", BOND_MODE_XOR},
205 { "broadcast", BOND_MODE_BROADCAST},
206 { "802.3ad", BOND_MODE_8023AD},
207 { "balance-tlb", BOND_MODE_TLB},
208 { "balance-alb", BOND_MODE_ALB},
209 { NULL, -1},
210 };
211
212 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
213 { "layer2", BOND_XMIT_POLICY_LAYER2},
214 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
215 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
216 { NULL, -1},
217 };
218
219 const struct bond_parm_tbl arp_validate_tbl[] = {
220 { "none", BOND_ARP_VALIDATE_NONE},
221 { "active", BOND_ARP_VALIDATE_ACTIVE},
222 { "backup", BOND_ARP_VALIDATE_BACKUP},
223 { "all", BOND_ARP_VALIDATE_ALL},
224 { NULL, -1},
225 };
226
227 const struct bond_parm_tbl fail_over_mac_tbl[] = {
228 { "none", BOND_FOM_NONE},
229 { "active", BOND_FOM_ACTIVE},
230 { "follow", BOND_FOM_FOLLOW},
231 { NULL, -1},
232 };
233
234 const struct bond_parm_tbl pri_reselect_tbl[] = {
235 { "always", BOND_PRI_RESELECT_ALWAYS},
236 { "better", BOND_PRI_RESELECT_BETTER},
237 { "failure", BOND_PRI_RESELECT_FAILURE},
238 { NULL, -1},
239 };
240
241 struct bond_parm_tbl ad_select_tbl[] = {
242 { "stable", BOND_AD_STABLE},
243 { "bandwidth", BOND_AD_BANDWIDTH},
244 { "count", BOND_AD_COUNT},
245 { NULL, -1},
246 };
247
248 /*-------------------------- Forward declarations ---------------------------*/
249
250 static int bond_init(struct net_device *bond_dev);
251 static void bond_uninit(struct net_device *bond_dev);
252
253 /*---------------------------- General routines -----------------------------*/
254
255 const char *bond_mode_name(int mode)
256 {
257 static const char *names[] = {
258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
260 [BOND_MODE_XOR] = "load balancing (xor)",
261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
263 [BOND_MODE_TLB] = "transmit load balancing",
264 [BOND_MODE_ALB] = "adaptive load balancing",
265 };
266
267 if (mode < 0 || mode > BOND_MODE_ALB)
268 return "unknown";
269
270 return names[mode];
271 }
272
273 /*---------------------------------- VLAN -----------------------------------*/
274
275 /**
276 * bond_add_vlan - add a new vlan id on bond
277 * @bond: bond that got the notification
278 * @vlan_id: the vlan id to add
279 *
280 * Returns -ENOMEM if allocation failed.
281 */
282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
283 {
284 struct vlan_entry *vlan;
285
286 pr_debug("bond: %s, vlan id %d\n",
287 (bond ? bond->dev->name : "None"), vlan_id);
288
289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
290 if (!vlan)
291 return -ENOMEM;
292
293 INIT_LIST_HEAD(&vlan->vlan_list);
294 vlan->vlan_id = vlan_id;
295
296 write_lock_bh(&bond->lock);
297
298 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
299
300 write_unlock_bh(&bond->lock);
301
302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
303
304 return 0;
305 }
306
307 /**
308 * bond_del_vlan - delete a vlan id from bond
309 * @bond: bond that got the notification
310 * @vlan_id: the vlan id to delete
311 *
312 * returns -ENODEV if @vlan_id was not found in @bond.
313 */
314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
315 {
316 struct vlan_entry *vlan;
317 int res = -ENODEV;
318
319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
320
321 block_netpoll_tx();
322 write_lock_bh(&bond->lock);
323
324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
325 if (vlan->vlan_id == vlan_id) {
326 list_del(&vlan->vlan_list);
327
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vlan_id);
330
331 pr_debug("removed VLAN ID %d from bond %s\n",
332 vlan_id, bond->dev->name);
333
334 kfree(vlan);
335
336 res = 0;
337 goto out;
338 }
339 }
340
341 pr_debug("couldn't find VLAN ID %d in bond %s\n",
342 vlan_id, bond->dev->name);
343
344 out:
345 write_unlock_bh(&bond->lock);
346 unblock_netpoll_tx();
347 return res;
348 }
349
350 /**
351 * bond_next_vlan - safely skip to the next item in the vlans list.
352 * @bond: the bond we're working on
353 * @curr: item we're advancing from
354 *
355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
356 * or @curr->next otherwise (even if it is @curr itself again).
357 *
358 * Caller must hold bond->lock
359 */
360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
361 {
362 struct vlan_entry *next, *last;
363
364 if (list_empty(&bond->vlan_list))
365 return NULL;
366
367 if (!curr) {
368 next = list_entry(bond->vlan_list.next,
369 struct vlan_entry, vlan_list);
370 } else {
371 last = list_entry(bond->vlan_list.prev,
372 struct vlan_entry, vlan_list);
373 if (last == curr) {
374 next = list_entry(bond->vlan_list.next,
375 struct vlan_entry, vlan_list);
376 } else {
377 next = list_entry(curr->vlan_list.next,
378 struct vlan_entry, vlan_list);
379 }
380 }
381
382 return next;
383 }
384
385 /**
386 * bond_dev_queue_xmit - Prepare skb for xmit.
387 *
388 * @bond: bond device that got this skb for tx.
389 * @skb: hw accel VLAN tagged skb to transmit
390 * @slave_dev: slave that is supposed to xmit this skbuff
391 */
392 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
393 struct net_device *slave_dev)
394 {
395 skb->dev = slave_dev;
396
397 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
398 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
399 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
400
401 if (unlikely(netpoll_tx_running(bond->dev)))
402 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
403 else
404 dev_queue_xmit(skb);
405
406 return 0;
407 }
408
409 /*
410 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
411 * We don't protect the slave list iteration with a lock because:
412 * a. This operation is performed in IOCTL context,
413 * b. The operation is protected by the RTNL semaphore in the 8021q code,
414 * c. Holding a lock with BH disabled while directly calling a base driver
415 * entry point is generally a BAD idea.
416 *
417 * The design of synchronization/protection for this operation in the 8021q
418 * module is good for one or more VLAN devices over a single physical device
419 * and cannot be extended for a teaming solution like bonding, so there is a
420 * potential race condition here where a net device from the vlan group might
421 * be referenced (either by a base driver or the 8021q code) while it is being
422 * removed from the system. However, it turns out we're not making matters
423 * worse, and if it works for regular VLAN usage it will work here too.
424 */
425
426 /**
427 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
428 * @bond_dev: bonding net device that got called
429 * @vid: vlan id being added
430 */
431 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
432 __be16 proto, u16 vid)
433 {
434 struct bonding *bond = netdev_priv(bond_dev);
435 struct slave *slave, *stop_at;
436 int i, res;
437
438 bond_for_each_slave(bond, slave, i) {
439 res = vlan_vid_add(slave->dev, proto, vid);
440 if (res)
441 goto unwind;
442 }
443
444 res = bond_add_vlan(bond, vid);
445 if (res) {
446 pr_err("%s: Error: Failed to add vlan id %d\n",
447 bond_dev->name, vid);
448 return res;
449 }
450
451 return 0;
452
453 unwind:
454 /* unwind from head to the slave that failed */
455 stop_at = slave;
456 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
457 vlan_vid_del(slave->dev, proto, vid);
458
459 return res;
460 }
461
462 /**
463 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
464 * @bond_dev: bonding net device that got called
465 * @vid: vlan id being removed
466 */
467 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
468 __be16 proto, u16 vid)
469 {
470 struct bonding *bond = netdev_priv(bond_dev);
471 struct slave *slave;
472 int i, res;
473
474 bond_for_each_slave(bond, slave, i)
475 vlan_vid_del(slave->dev, proto, vid);
476
477 res = bond_del_vlan(bond, vid);
478 if (res) {
479 pr_err("%s: Error: Failed to remove vlan id %d\n",
480 bond_dev->name, vid);
481 return res;
482 }
483
484 return 0;
485 }
486
487 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
488 {
489 struct vlan_entry *vlan;
490 int res;
491
492 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
493 res = vlan_vid_add(slave_dev, htons(ETH_P_8021Q),
494 vlan->vlan_id);
495 if (res)
496 pr_warning("%s: Failed to add vlan id %d to device %s\n",
497 bond->dev->name, vlan->vlan_id,
498 slave_dev->name);
499 }
500 }
501
502 static void bond_del_vlans_from_slave(struct bonding *bond,
503 struct net_device *slave_dev)
504 {
505 struct vlan_entry *vlan;
506
507 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
508 if (!vlan->vlan_id)
509 continue;
510 vlan_vid_del(slave_dev, htons(ETH_P_8021Q), vlan->vlan_id);
511 }
512 }
513
514 /*------------------------------- Link status -------------------------------*/
515
516 /*
517 * Set the carrier state for the master according to the state of its
518 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
519 * do special 802.3ad magic.
520 *
521 * Returns zero if carrier state does not change, nonzero if it does.
522 */
523 static int bond_set_carrier(struct bonding *bond)
524 {
525 struct slave *slave;
526 int i;
527
528 if (bond->slave_cnt == 0)
529 goto down;
530
531 if (bond->params.mode == BOND_MODE_8023AD)
532 return bond_3ad_set_carrier(bond);
533
534 bond_for_each_slave(bond, slave, i) {
535 if (slave->link == BOND_LINK_UP) {
536 if (!netif_carrier_ok(bond->dev)) {
537 netif_carrier_on(bond->dev);
538 return 1;
539 }
540 return 0;
541 }
542 }
543
544 down:
545 if (netif_carrier_ok(bond->dev)) {
546 netif_carrier_off(bond->dev);
547 return 1;
548 }
549 return 0;
550 }
551
552 /*
553 * Get link speed and duplex from the slave's base driver
554 * using ethtool. If for some reason the call fails or the
555 * values are invalid, set speed and duplex to -1,
556 * and return.
557 */
558 static void bond_update_speed_duplex(struct slave *slave)
559 {
560 struct net_device *slave_dev = slave->dev;
561 struct ethtool_cmd ecmd;
562 u32 slave_speed;
563 int res;
564
565 slave->speed = SPEED_UNKNOWN;
566 slave->duplex = DUPLEX_UNKNOWN;
567
568 res = __ethtool_get_settings(slave_dev, &ecmd);
569 if (res < 0)
570 return;
571
572 slave_speed = ethtool_cmd_speed(&ecmd);
573 if (slave_speed == 0 || slave_speed == ((__u32) -1))
574 return;
575
576 switch (ecmd.duplex) {
577 case DUPLEX_FULL:
578 case DUPLEX_HALF:
579 break;
580 default:
581 return;
582 }
583
584 slave->speed = slave_speed;
585 slave->duplex = ecmd.duplex;
586
587 return;
588 }
589
590 /*
591 * if <dev> supports MII link status reporting, check its link status.
592 *
593 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
594 * depending upon the setting of the use_carrier parameter.
595 *
596 * Return either BMSR_LSTATUS, meaning that the link is up (or we
597 * can't tell and just pretend it is), or 0, meaning that the link is
598 * down.
599 *
600 * If reporting is non-zero, instead of faking link up, return -1 if
601 * both ETHTOOL and MII ioctls fail (meaning the device does not
602 * support them). If use_carrier is set, return whatever it says.
603 * It'd be nice if there was a good way to tell if a driver supports
604 * netif_carrier, but there really isn't.
605 */
606 static int bond_check_dev_link(struct bonding *bond,
607 struct net_device *slave_dev, int reporting)
608 {
609 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
610 int (*ioctl)(struct net_device *, struct ifreq *, int);
611 struct ifreq ifr;
612 struct mii_ioctl_data *mii;
613
614 if (!reporting && !netif_running(slave_dev))
615 return 0;
616
617 if (bond->params.use_carrier)
618 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
619
620 /* Try to get link status using Ethtool first. */
621 if (slave_dev->ethtool_ops->get_link)
622 return slave_dev->ethtool_ops->get_link(slave_dev) ?
623 BMSR_LSTATUS : 0;
624
625 /* Ethtool can't be used, fallback to MII ioctls. */
626 ioctl = slave_ops->ndo_do_ioctl;
627 if (ioctl) {
628 /* TODO: set pointer to correct ioctl on a per team member */
629 /* bases to make this more efficient. that is, once */
630 /* we determine the correct ioctl, we will always */
631 /* call it and not the others for that team */
632 /* member. */
633
634 /*
635 * We cannot assume that SIOCGMIIPHY will also read a
636 * register; not all network drivers (e.g., e100)
637 * support that.
638 */
639
640 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
641 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
642 mii = if_mii(&ifr);
643 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
644 mii->reg_num = MII_BMSR;
645 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
646 return mii->val_out & BMSR_LSTATUS;
647 }
648 }
649
650 /*
651 * If reporting, report that either there's no dev->do_ioctl,
652 * or both SIOCGMIIREG and get_link failed (meaning that we
653 * cannot report link status). If not reporting, pretend
654 * we're ok.
655 */
656 return reporting ? -1 : BMSR_LSTATUS;
657 }
658
659 /*----------------------------- Multicast list ------------------------------*/
660
661 /*
662 * Push the promiscuity flag down to appropriate slaves
663 */
664 static int bond_set_promiscuity(struct bonding *bond, int inc)
665 {
666 int err = 0;
667 if (USES_PRIMARY(bond->params.mode)) {
668 /* write lock already acquired */
669 if (bond->curr_active_slave) {
670 err = dev_set_promiscuity(bond->curr_active_slave->dev,
671 inc);
672 }
673 } else {
674 struct slave *slave;
675 int i;
676 bond_for_each_slave(bond, slave, i) {
677 err = dev_set_promiscuity(slave->dev, inc);
678 if (err)
679 return err;
680 }
681 }
682 return err;
683 }
684
685 /*
686 * Push the allmulti flag down to all slaves
687 */
688 static int bond_set_allmulti(struct bonding *bond, int inc)
689 {
690 int err = 0;
691 if (USES_PRIMARY(bond->params.mode)) {
692 /* write lock already acquired */
693 if (bond->curr_active_slave) {
694 err = dev_set_allmulti(bond->curr_active_slave->dev,
695 inc);
696 }
697 } else {
698 struct slave *slave;
699 int i;
700 bond_for_each_slave(bond, slave, i) {
701 err = dev_set_allmulti(slave->dev, inc);
702 if (err)
703 return err;
704 }
705 }
706 return err;
707 }
708
709 /*
710 * Add a Multicast address to slaves
711 * according to mode
712 */
713 static void bond_mc_add(struct bonding *bond, void *addr)
714 {
715 if (USES_PRIMARY(bond->params.mode)) {
716 /* write lock already acquired */
717 if (bond->curr_active_slave)
718 dev_mc_add(bond->curr_active_slave->dev, addr);
719 } else {
720 struct slave *slave;
721 int i;
722
723 bond_for_each_slave(bond, slave, i)
724 dev_mc_add(slave->dev, addr);
725 }
726 }
727
728 /*
729 * Remove a multicast address from slave
730 * according to mode
731 */
732 static void bond_mc_del(struct bonding *bond, void *addr)
733 {
734 if (USES_PRIMARY(bond->params.mode)) {
735 /* write lock already acquired */
736 if (bond->curr_active_slave)
737 dev_mc_del(bond->curr_active_slave->dev, addr);
738 } else {
739 struct slave *slave;
740 int i;
741 bond_for_each_slave(bond, slave, i) {
742 dev_mc_del(slave->dev, addr);
743 }
744 }
745 }
746
747
748 static void __bond_resend_igmp_join_requests(struct net_device *dev)
749 {
750 struct in_device *in_dev;
751
752 in_dev = __in_dev_get_rcu(dev);
753 if (in_dev)
754 ip_mc_rejoin_groups(in_dev);
755 }
756
757 /*
758 * Retrieve the list of registered multicast addresses for the bonding
759 * device and retransmit an IGMP JOIN request to the current active
760 * slave.
761 */
762 static void bond_resend_igmp_join_requests(struct bonding *bond)
763 {
764 struct net_device *bond_dev, *vlan_dev, *upper_dev;
765 struct vlan_entry *vlan;
766
767 read_lock(&bond->lock);
768 rcu_read_lock();
769
770 bond_dev = bond->dev;
771
772 /* rejoin all groups on bond device */
773 __bond_resend_igmp_join_requests(bond_dev);
774
775 /*
776 * if bond is enslaved to a bridge,
777 * then rejoin all groups on its master
778 */
779 upper_dev = netdev_master_upper_dev_get_rcu(bond_dev);
780 if (upper_dev && upper_dev->priv_flags & IFF_EBRIDGE)
781 __bond_resend_igmp_join_requests(upper_dev);
782
783 /* rejoin all groups on vlan devices */
784 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
785 vlan_dev = __vlan_find_dev_deep(bond_dev, htons(ETH_P_8021Q),
786 vlan->vlan_id);
787 if (vlan_dev)
788 __bond_resend_igmp_join_requests(vlan_dev);
789 }
790 rcu_read_unlock();
791
792 /* We use curr_slave_lock to protect against concurrent access to
793 * igmp_retrans from multiple running instances of this function and
794 * bond_change_active_slave
795 */
796 write_lock_bh(&bond->curr_slave_lock);
797 if (bond->igmp_retrans > 1) {
798 bond->igmp_retrans--;
799 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
800 }
801 write_unlock_bh(&bond->curr_slave_lock);
802 read_unlock(&bond->lock);
803 }
804
805 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
806 {
807 struct bonding *bond = container_of(work, struct bonding,
808 mcast_work.work);
809
810 bond_resend_igmp_join_requests(bond);
811 }
812
813 /*
814 * flush all members of flush->mc_list from device dev->mc_list
815 */
816 static void bond_mc_list_flush(struct net_device *bond_dev,
817 struct net_device *slave_dev)
818 {
819 struct bonding *bond = netdev_priv(bond_dev);
820 struct netdev_hw_addr *ha;
821
822 netdev_for_each_mc_addr(ha, bond_dev)
823 dev_mc_del(slave_dev, ha->addr);
824
825 if (bond->params.mode == BOND_MODE_8023AD) {
826 /* del lacpdu mc addr from mc list */
827 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
828
829 dev_mc_del(slave_dev, lacpdu_multicast);
830 }
831 }
832
833 /*--------------------------- Active slave change ---------------------------*/
834
835 /*
836 * Update the mc list and multicast-related flags for the new and
837 * old active slaves (if any) according to the multicast mode, and
838 * promiscuous flags unconditionally.
839 */
840 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
841 struct slave *old_active)
842 {
843 struct netdev_hw_addr *ha;
844
845 if (!USES_PRIMARY(bond->params.mode))
846 /* nothing to do - mc list is already up-to-date on
847 * all slaves
848 */
849 return;
850
851 if (old_active) {
852 if (bond->dev->flags & IFF_PROMISC)
853 dev_set_promiscuity(old_active->dev, -1);
854
855 if (bond->dev->flags & IFF_ALLMULTI)
856 dev_set_allmulti(old_active->dev, -1);
857
858 netif_addr_lock_bh(bond->dev);
859 netdev_for_each_mc_addr(ha, bond->dev)
860 dev_mc_del(old_active->dev, ha->addr);
861 netif_addr_unlock_bh(bond->dev);
862 }
863
864 if (new_active) {
865 /* FIXME: Signal errors upstream. */
866 if (bond->dev->flags & IFF_PROMISC)
867 dev_set_promiscuity(new_active->dev, 1);
868
869 if (bond->dev->flags & IFF_ALLMULTI)
870 dev_set_allmulti(new_active->dev, 1);
871
872 netif_addr_lock_bh(bond->dev);
873 netdev_for_each_mc_addr(ha, bond->dev)
874 dev_mc_add(new_active->dev, ha->addr);
875 netif_addr_unlock_bh(bond->dev);
876 }
877 }
878
879 static struct slave *bond_get_old_active(struct bonding *bond,
880 struct slave *new_active)
881 {
882 struct slave *slave;
883 int i;
884
885 bond_for_each_slave(bond, slave, i) {
886 if (slave == new_active)
887 continue;
888
889 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
890 return slave;
891 }
892
893 return NULL;
894 }
895
896 /*
897 * bond_do_fail_over_mac
898 *
899 * Perform special MAC address swapping for fail_over_mac settings
900 *
901 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
902 */
903 static void bond_do_fail_over_mac(struct bonding *bond,
904 struct slave *new_active,
905 struct slave *old_active)
906 __releases(&bond->curr_slave_lock)
907 __releases(&bond->lock)
908 __acquires(&bond->lock)
909 __acquires(&bond->curr_slave_lock)
910 {
911 u8 tmp_mac[ETH_ALEN];
912 struct sockaddr saddr;
913 int rv;
914
915 switch (bond->params.fail_over_mac) {
916 case BOND_FOM_ACTIVE:
917 if (new_active) {
918 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
919 new_active->dev->addr_len);
920 write_unlock_bh(&bond->curr_slave_lock);
921 read_unlock(&bond->lock);
922 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
923 read_lock(&bond->lock);
924 write_lock_bh(&bond->curr_slave_lock);
925 }
926 break;
927 case BOND_FOM_FOLLOW:
928 /*
929 * if new_active && old_active, swap them
930 * if just old_active, do nothing (going to no active slave)
931 * if just new_active, set new_active to bond's MAC
932 */
933 if (!new_active)
934 return;
935
936 write_unlock_bh(&bond->curr_slave_lock);
937 read_unlock(&bond->lock);
938
939 if (!old_active)
940 old_active = bond_get_old_active(bond, new_active);
941
942 if (old_active) {
943 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
944 memcpy(saddr.sa_data, old_active->dev->dev_addr,
945 ETH_ALEN);
946 saddr.sa_family = new_active->dev->type;
947 } else {
948 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
949 saddr.sa_family = bond->dev->type;
950 }
951
952 rv = dev_set_mac_address(new_active->dev, &saddr);
953 if (rv) {
954 pr_err("%s: Error %d setting MAC of slave %s\n",
955 bond->dev->name, -rv, new_active->dev->name);
956 goto out;
957 }
958
959 if (!old_active)
960 goto out;
961
962 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
963 saddr.sa_family = old_active->dev->type;
964
965 rv = dev_set_mac_address(old_active->dev, &saddr);
966 if (rv)
967 pr_err("%s: Error %d setting MAC of slave %s\n",
968 bond->dev->name, -rv, new_active->dev->name);
969 out:
970 read_lock(&bond->lock);
971 write_lock_bh(&bond->curr_slave_lock);
972 break;
973 default:
974 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
975 bond->dev->name, bond->params.fail_over_mac);
976 break;
977 }
978
979 }
980
981 static bool bond_should_change_active(struct bonding *bond)
982 {
983 struct slave *prim = bond->primary_slave;
984 struct slave *curr = bond->curr_active_slave;
985
986 if (!prim || !curr || curr->link != BOND_LINK_UP)
987 return true;
988 if (bond->force_primary) {
989 bond->force_primary = false;
990 return true;
991 }
992 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
993 (prim->speed < curr->speed ||
994 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
995 return false;
996 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
997 return false;
998 return true;
999 }
1000
1001 /**
1002 * find_best_interface - select the best available slave to be the active one
1003 * @bond: our bonding struct
1004 *
1005 * Warning: Caller must hold curr_slave_lock for writing.
1006 */
1007 static struct slave *bond_find_best_slave(struct bonding *bond)
1008 {
1009 struct slave *new_active, *old_active;
1010 struct slave *bestslave = NULL;
1011 int mintime = bond->params.updelay;
1012 int i;
1013
1014 new_active = bond->curr_active_slave;
1015
1016 if (!new_active) { /* there were no active slaves left */
1017 if (bond->slave_cnt > 0) /* found one slave */
1018 new_active = bond->first_slave;
1019 else
1020 return NULL; /* still no slave, return NULL */
1021 }
1022
1023 if ((bond->primary_slave) &&
1024 bond->primary_slave->link == BOND_LINK_UP &&
1025 bond_should_change_active(bond)) {
1026 new_active = bond->primary_slave;
1027 }
1028
1029 /* remember where to stop iterating over the slaves */
1030 old_active = new_active;
1031
1032 bond_for_each_slave_from(bond, new_active, i, old_active) {
1033 if (new_active->link == BOND_LINK_UP) {
1034 return new_active;
1035 } else if (new_active->link == BOND_LINK_BACK &&
1036 IS_UP(new_active->dev)) {
1037 /* link up, but waiting for stabilization */
1038 if (new_active->delay < mintime) {
1039 mintime = new_active->delay;
1040 bestslave = new_active;
1041 }
1042 }
1043 }
1044
1045 return bestslave;
1046 }
1047
1048 static bool bond_should_notify_peers(struct bonding *bond)
1049 {
1050 struct slave *slave = bond->curr_active_slave;
1051
1052 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1053 bond->dev->name, slave ? slave->dev->name : "NULL");
1054
1055 if (!slave || !bond->send_peer_notif ||
1056 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1057 return false;
1058
1059 bond->send_peer_notif--;
1060 return true;
1061 }
1062
1063 /**
1064 * change_active_interface - change the active slave into the specified one
1065 * @bond: our bonding struct
1066 * @new: the new slave to make the active one
1067 *
1068 * Set the new slave to the bond's settings and unset them on the old
1069 * curr_active_slave.
1070 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1071 *
1072 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1073 * because it is apparently the best available slave we have, even though its
1074 * updelay hasn't timed out yet.
1075 *
1076 * If new_active is not NULL, caller must hold bond->lock for read and
1077 * curr_slave_lock for write_bh.
1078 */
1079 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1080 {
1081 struct slave *old_active = bond->curr_active_slave;
1082
1083 if (old_active == new_active)
1084 return;
1085
1086 if (new_active) {
1087 new_active->jiffies = jiffies;
1088
1089 if (new_active->link == BOND_LINK_BACK) {
1090 if (USES_PRIMARY(bond->params.mode)) {
1091 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1092 bond->dev->name, new_active->dev->name,
1093 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1094 }
1095
1096 new_active->delay = 0;
1097 new_active->link = BOND_LINK_UP;
1098
1099 if (bond->params.mode == BOND_MODE_8023AD)
1100 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1101
1102 if (bond_is_lb(bond))
1103 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1104 } else {
1105 if (USES_PRIMARY(bond->params.mode)) {
1106 pr_info("%s: making interface %s the new active one.\n",
1107 bond->dev->name, new_active->dev->name);
1108 }
1109 }
1110 }
1111
1112 if (USES_PRIMARY(bond->params.mode))
1113 bond_mc_swap(bond, new_active, old_active);
1114
1115 if (bond_is_lb(bond)) {
1116 bond_alb_handle_active_change(bond, new_active);
1117 if (old_active)
1118 bond_set_slave_inactive_flags(old_active);
1119 if (new_active)
1120 bond_set_slave_active_flags(new_active);
1121 } else {
1122 bond->curr_active_slave = new_active;
1123 }
1124
1125 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1126 if (old_active)
1127 bond_set_slave_inactive_flags(old_active);
1128
1129 if (new_active) {
1130 bool should_notify_peers = false;
1131
1132 bond_set_slave_active_flags(new_active);
1133
1134 if (bond->params.fail_over_mac)
1135 bond_do_fail_over_mac(bond, new_active,
1136 old_active);
1137
1138 if (netif_running(bond->dev)) {
1139 bond->send_peer_notif =
1140 bond->params.num_peer_notif;
1141 should_notify_peers =
1142 bond_should_notify_peers(bond);
1143 }
1144
1145 write_unlock_bh(&bond->curr_slave_lock);
1146 read_unlock(&bond->lock);
1147
1148 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1149 if (should_notify_peers)
1150 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1151 bond->dev);
1152
1153 read_lock(&bond->lock);
1154 write_lock_bh(&bond->curr_slave_lock);
1155 }
1156 }
1157
1158 /* resend IGMP joins since active slave has changed or
1159 * all were sent on curr_active_slave.
1160 * resend only if bond is brought up with the affected
1161 * bonding modes and the retransmission is enabled */
1162 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1163 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1164 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1165 bond->igmp_retrans = bond->params.resend_igmp;
1166 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1167 }
1168 }
1169
1170 /**
1171 * bond_select_active_slave - select a new active slave, if needed
1172 * @bond: our bonding struct
1173 *
1174 * This functions should be called when one of the following occurs:
1175 * - The old curr_active_slave has been released or lost its link.
1176 * - The primary_slave has got its link back.
1177 * - A slave has got its link back and there's no old curr_active_slave.
1178 *
1179 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1180 */
1181 void bond_select_active_slave(struct bonding *bond)
1182 {
1183 struct slave *best_slave;
1184 int rv;
1185
1186 best_slave = bond_find_best_slave(bond);
1187 if (best_slave != bond->curr_active_slave) {
1188 bond_change_active_slave(bond, best_slave);
1189 rv = bond_set_carrier(bond);
1190 if (!rv)
1191 return;
1192
1193 if (netif_carrier_ok(bond->dev)) {
1194 pr_info("%s: first active interface up!\n",
1195 bond->dev->name);
1196 } else {
1197 pr_info("%s: now running without any active interface !\n",
1198 bond->dev->name);
1199 }
1200 }
1201 }
1202
1203 /*--------------------------- slave list handling ---------------------------*/
1204
1205 /*
1206 * This function attaches the slave to the end of list.
1207 *
1208 * bond->lock held for writing by caller.
1209 */
1210 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1211 {
1212 if (bond->first_slave == NULL) { /* attaching the first slave */
1213 new_slave->next = new_slave;
1214 new_slave->prev = new_slave;
1215 bond->first_slave = new_slave;
1216 } else {
1217 new_slave->next = bond->first_slave;
1218 new_slave->prev = bond->first_slave->prev;
1219 new_slave->next->prev = new_slave;
1220 new_slave->prev->next = new_slave;
1221 }
1222
1223 bond->slave_cnt++;
1224 }
1225
1226 /*
1227 * This function detaches the slave from the list.
1228 * WARNING: no check is made to verify if the slave effectively
1229 * belongs to <bond>.
1230 * Nothing is freed on return, structures are just unchained.
1231 * If any slave pointer in bond was pointing to <slave>,
1232 * it should be changed by the calling function.
1233 *
1234 * bond->lock held for writing by caller.
1235 */
1236 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1237 {
1238 if (slave->next)
1239 slave->next->prev = slave->prev;
1240
1241 if (slave->prev)
1242 slave->prev->next = slave->next;
1243
1244 if (bond->first_slave == slave) { /* slave is the first slave */
1245 if (bond->slave_cnt > 1) { /* there are more slave */
1246 bond->first_slave = slave->next;
1247 } else {
1248 bond->first_slave = NULL; /* slave was the last one */
1249 }
1250 }
1251
1252 slave->next = NULL;
1253 slave->prev = NULL;
1254 bond->slave_cnt--;
1255 }
1256
1257 #ifdef CONFIG_NET_POLL_CONTROLLER
1258 static inline int slave_enable_netpoll(struct slave *slave)
1259 {
1260 struct netpoll *np;
1261 int err = 0;
1262
1263 np = kzalloc(sizeof(*np), GFP_ATOMIC);
1264 err = -ENOMEM;
1265 if (!np)
1266 goto out;
1267
1268 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1269 if (err) {
1270 kfree(np);
1271 goto out;
1272 }
1273 slave->np = np;
1274 out:
1275 return err;
1276 }
1277 static inline void slave_disable_netpoll(struct slave *slave)
1278 {
1279 struct netpoll *np = slave->np;
1280
1281 if (!np)
1282 return;
1283
1284 slave->np = NULL;
1285 __netpoll_free_async(np);
1286 }
1287 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1288 {
1289 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1290 return false;
1291 if (!slave_dev->netdev_ops->ndo_poll_controller)
1292 return false;
1293 return true;
1294 }
1295
1296 static void bond_poll_controller(struct net_device *bond_dev)
1297 {
1298 }
1299
1300 static void __bond_netpoll_cleanup(struct bonding *bond)
1301 {
1302 struct slave *slave;
1303 int i;
1304
1305 bond_for_each_slave(bond, slave, i)
1306 if (IS_UP(slave->dev))
1307 slave_disable_netpoll(slave);
1308 }
1309 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1310 {
1311 struct bonding *bond = netdev_priv(bond_dev);
1312
1313 read_lock(&bond->lock);
1314 __bond_netpoll_cleanup(bond);
1315 read_unlock(&bond->lock);
1316 }
1317
1318 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1319 {
1320 struct bonding *bond = netdev_priv(dev);
1321 struct slave *slave;
1322 int i, err = 0;
1323
1324 read_lock(&bond->lock);
1325 bond_for_each_slave(bond, slave, i) {
1326 err = slave_enable_netpoll(slave);
1327 if (err) {
1328 __bond_netpoll_cleanup(bond);
1329 break;
1330 }
1331 }
1332 read_unlock(&bond->lock);
1333 return err;
1334 }
1335
1336 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1337 {
1338 return bond->dev->npinfo;
1339 }
1340
1341 #else
1342 static inline int slave_enable_netpoll(struct slave *slave)
1343 {
1344 return 0;
1345 }
1346 static inline void slave_disable_netpoll(struct slave *slave)
1347 {
1348 }
1349 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1350 {
1351 }
1352 #endif
1353
1354 /*---------------------------------- IOCTL ----------------------------------*/
1355
1356 static void bond_set_dev_addr(struct net_device *bond_dev,
1357 struct net_device *slave_dev)
1358 {
1359 pr_debug("bond_dev=%p\n", bond_dev);
1360 pr_debug("slave_dev=%p\n", slave_dev);
1361 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1362 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1363 bond_dev->addr_assign_type = NET_ADDR_SET;
1364 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
1365 }
1366
1367 static netdev_features_t bond_fix_features(struct net_device *dev,
1368 netdev_features_t features)
1369 {
1370 struct slave *slave;
1371 struct bonding *bond = netdev_priv(dev);
1372 netdev_features_t mask;
1373 int i;
1374
1375 read_lock(&bond->lock);
1376
1377 if (!bond->first_slave) {
1378 /* Disable adding VLANs to empty bond. But why? --mq */
1379 features |= NETIF_F_VLAN_CHALLENGED;
1380 goto out;
1381 }
1382
1383 mask = features;
1384 features &= ~NETIF_F_ONE_FOR_ALL;
1385 features |= NETIF_F_ALL_FOR_ALL;
1386
1387 bond_for_each_slave(bond, slave, i) {
1388 features = netdev_increment_features(features,
1389 slave->dev->features,
1390 mask);
1391 }
1392 features = netdev_add_tso_features(features, mask);
1393
1394 out:
1395 read_unlock(&bond->lock);
1396 return features;
1397 }
1398
1399 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1400 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1401 NETIF_F_HIGHDMA | NETIF_F_LRO)
1402
1403 static void bond_compute_features(struct bonding *bond)
1404 {
1405 struct slave *slave;
1406 struct net_device *bond_dev = bond->dev;
1407 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1408 unsigned short max_hard_header_len = ETH_HLEN;
1409 unsigned int gso_max_size = GSO_MAX_SIZE;
1410 u16 gso_max_segs = GSO_MAX_SEGS;
1411 int i;
1412 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1413
1414 read_lock(&bond->lock);
1415
1416 if (!bond->first_slave)
1417 goto done;
1418
1419 bond_for_each_slave(bond, slave, i) {
1420 vlan_features = netdev_increment_features(vlan_features,
1421 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1422
1423 dst_release_flag &= slave->dev->priv_flags;
1424 if (slave->dev->hard_header_len > max_hard_header_len)
1425 max_hard_header_len = slave->dev->hard_header_len;
1426
1427 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1428 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1429 }
1430
1431 done:
1432 bond_dev->vlan_features = vlan_features;
1433 bond_dev->hard_header_len = max_hard_header_len;
1434 bond_dev->gso_max_segs = gso_max_segs;
1435 netif_set_gso_max_size(bond_dev, gso_max_size);
1436
1437 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1438 bond_dev->priv_flags = flags | dst_release_flag;
1439
1440 read_unlock(&bond->lock);
1441
1442 netdev_change_features(bond_dev);
1443 }
1444
1445 static void bond_setup_by_slave(struct net_device *bond_dev,
1446 struct net_device *slave_dev)
1447 {
1448 struct bonding *bond = netdev_priv(bond_dev);
1449
1450 bond_dev->header_ops = slave_dev->header_ops;
1451
1452 bond_dev->type = slave_dev->type;
1453 bond_dev->hard_header_len = slave_dev->hard_header_len;
1454 bond_dev->addr_len = slave_dev->addr_len;
1455
1456 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1457 slave_dev->addr_len);
1458 bond->setup_by_slave = 1;
1459 }
1460
1461 /* On bonding slaves other than the currently active slave, suppress
1462 * duplicates except for alb non-mcast/bcast.
1463 */
1464 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1465 struct slave *slave,
1466 struct bonding *bond)
1467 {
1468 if (bond_is_slave_inactive(slave)) {
1469 if (bond->params.mode == BOND_MODE_ALB &&
1470 skb->pkt_type != PACKET_BROADCAST &&
1471 skb->pkt_type != PACKET_MULTICAST)
1472 return false;
1473 return true;
1474 }
1475 return false;
1476 }
1477
1478 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1479 {
1480 struct sk_buff *skb = *pskb;
1481 struct slave *slave;
1482 struct bonding *bond;
1483 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1484 struct slave *);
1485 int ret = RX_HANDLER_ANOTHER;
1486
1487 skb = skb_share_check(skb, GFP_ATOMIC);
1488 if (unlikely(!skb))
1489 return RX_HANDLER_CONSUMED;
1490
1491 *pskb = skb;
1492
1493 slave = bond_slave_get_rcu(skb->dev);
1494 bond = slave->bond;
1495
1496 if (bond->params.arp_interval)
1497 slave->dev->last_rx = jiffies;
1498
1499 recv_probe = ACCESS_ONCE(bond->recv_probe);
1500 if (recv_probe) {
1501 ret = recv_probe(skb, bond, slave);
1502 if (ret == RX_HANDLER_CONSUMED) {
1503 consume_skb(skb);
1504 return ret;
1505 }
1506 }
1507
1508 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1509 return RX_HANDLER_EXACT;
1510 }
1511
1512 skb->dev = bond->dev;
1513
1514 if (bond->params.mode == BOND_MODE_ALB &&
1515 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1516 skb->pkt_type == PACKET_HOST) {
1517
1518 if (unlikely(skb_cow_head(skb,
1519 skb->data - skb_mac_header(skb)))) {
1520 kfree_skb(skb);
1521 return RX_HANDLER_CONSUMED;
1522 }
1523 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1524 }
1525
1526 return ret;
1527 }
1528
1529 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1530 struct net_device *slave_dev)
1531 {
1532 int err;
1533
1534 err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1535 if (err)
1536 return err;
1537 slave_dev->flags |= IFF_SLAVE;
1538 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1539 return 0;
1540 }
1541
1542 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1543 struct net_device *slave_dev)
1544 {
1545 netdev_upper_dev_unlink(slave_dev, bond_dev);
1546 slave_dev->flags &= ~IFF_SLAVE;
1547 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1548 }
1549
1550 /* enslave device <slave> to bond device <master> */
1551 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1552 {
1553 struct bonding *bond = netdev_priv(bond_dev);
1554 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1555 struct slave *new_slave = NULL;
1556 struct netdev_hw_addr *ha;
1557 struct sockaddr addr;
1558 int link_reporting;
1559 int res = 0;
1560
1561 if (!bond->params.use_carrier &&
1562 slave_dev->ethtool_ops->get_link == NULL &&
1563 slave_ops->ndo_do_ioctl == NULL) {
1564 pr_warning("%s: Warning: no link monitoring support for %s\n",
1565 bond_dev->name, slave_dev->name);
1566 }
1567
1568 /* already in-use? */
1569 if (netdev_is_rx_handler_busy(slave_dev)) {
1570 netdev_err(bond_dev,
1571 "Error: Device is in use and cannot be enslaved\n");
1572 return -EBUSY;
1573 }
1574
1575 /* vlan challenged mutual exclusion */
1576 /* no need to lock since we're protected by rtnl_lock */
1577 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1578 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1579 if (vlan_uses_dev(bond_dev)) {
1580 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1581 bond_dev->name, slave_dev->name, bond_dev->name);
1582 return -EPERM;
1583 } else {
1584 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1585 bond_dev->name, slave_dev->name,
1586 slave_dev->name, bond_dev->name);
1587 }
1588 } else {
1589 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1590 }
1591
1592 /*
1593 * Old ifenslave binaries are no longer supported. These can
1594 * be identified with moderate accuracy by the state of the slave:
1595 * the current ifenslave will set the interface down prior to
1596 * enslaving it; the old ifenslave will not.
1597 */
1598 if ((slave_dev->flags & IFF_UP)) {
1599 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1600 slave_dev->name);
1601 res = -EPERM;
1602 goto err_undo_flags;
1603 }
1604
1605 /* set bonding device ether type by slave - bonding netdevices are
1606 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1607 * there is a need to override some of the type dependent attribs/funcs.
1608 *
1609 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1610 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1611 */
1612 if (bond->slave_cnt == 0) {
1613 if (bond_dev->type != slave_dev->type) {
1614 pr_debug("%s: change device type from %d to %d\n",
1615 bond_dev->name,
1616 bond_dev->type, slave_dev->type);
1617
1618 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1619 bond_dev);
1620 res = notifier_to_errno(res);
1621 if (res) {
1622 pr_err("%s: refused to change device type\n",
1623 bond_dev->name);
1624 res = -EBUSY;
1625 goto err_undo_flags;
1626 }
1627
1628 /* Flush unicast and multicast addresses */
1629 dev_uc_flush(bond_dev);
1630 dev_mc_flush(bond_dev);
1631
1632 if (slave_dev->type != ARPHRD_ETHER)
1633 bond_setup_by_slave(bond_dev, slave_dev);
1634 else {
1635 ether_setup(bond_dev);
1636 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1637 }
1638
1639 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1640 bond_dev);
1641 }
1642 } else if (bond_dev->type != slave_dev->type) {
1643 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1644 slave_dev->name,
1645 slave_dev->type, bond_dev->type);
1646 res = -EINVAL;
1647 goto err_undo_flags;
1648 }
1649
1650 if (slave_ops->ndo_set_mac_address == NULL) {
1651 if (bond->slave_cnt == 0) {
1652 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1653 bond_dev->name);
1654 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1655 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1656 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",
1657 bond_dev->name);
1658 res = -EOPNOTSUPP;
1659 goto err_undo_flags;
1660 }
1661 }
1662
1663 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1664
1665 /* If this is the first slave, then we need to set the master's hardware
1666 * address to be the same as the slave's. */
1667 if (bond->slave_cnt == 0 && bond->dev_addr_from_first)
1668 bond_set_dev_addr(bond->dev, slave_dev);
1669
1670 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1671 if (!new_slave) {
1672 res = -ENOMEM;
1673 goto err_undo_flags;
1674 }
1675
1676 /*
1677 * Set the new_slave's queue_id to be zero. Queue ID mapping
1678 * is set via sysfs or module option if desired.
1679 */
1680 new_slave->queue_id = 0;
1681
1682 /* Save slave's original mtu and then set it to match the bond */
1683 new_slave->original_mtu = slave_dev->mtu;
1684 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1685 if (res) {
1686 pr_debug("Error %d calling dev_set_mtu\n", res);
1687 goto err_free;
1688 }
1689
1690 /*
1691 * Save slave's original ("permanent") mac address for modes
1692 * that need it, and for restoring it upon release, and then
1693 * set it to the master's address
1694 */
1695 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1696
1697 if (!bond->params.fail_over_mac) {
1698 /*
1699 * Set slave to master's mac address. The application already
1700 * set the master's mac address to that of the first slave
1701 */
1702 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1703 addr.sa_family = slave_dev->type;
1704 res = dev_set_mac_address(slave_dev, &addr);
1705 if (res) {
1706 pr_debug("Error %d calling set_mac_address\n", res);
1707 goto err_restore_mtu;
1708 }
1709 }
1710
1711 res = bond_master_upper_dev_link(bond_dev, slave_dev);
1712 if (res) {
1713 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1714 goto err_restore_mac;
1715 }
1716
1717 /* open the slave since the application closed it */
1718 res = dev_open(slave_dev);
1719 if (res) {
1720 pr_debug("Opening slave %s failed\n", slave_dev->name);
1721 goto err_unset_master;
1722 }
1723
1724 new_slave->bond = bond;
1725 new_slave->dev = slave_dev;
1726 slave_dev->priv_flags |= IFF_BONDING;
1727
1728 if (bond_is_lb(bond)) {
1729 /* bond_alb_init_slave() must be called before all other stages since
1730 * it might fail and we do not want to have to undo everything
1731 */
1732 res = bond_alb_init_slave(bond, new_slave);
1733 if (res)
1734 goto err_close;
1735 }
1736
1737 /* If the mode USES_PRIMARY, then the new slave gets the
1738 * master's promisc (and mc) settings only if it becomes the
1739 * curr_active_slave, and that is taken care of later when calling
1740 * bond_change_active()
1741 */
1742 if (!USES_PRIMARY(bond->params.mode)) {
1743 /* set promiscuity level to new slave */
1744 if (bond_dev->flags & IFF_PROMISC) {
1745 res = dev_set_promiscuity(slave_dev, 1);
1746 if (res)
1747 goto err_close;
1748 }
1749
1750 /* set allmulti level to new slave */
1751 if (bond_dev->flags & IFF_ALLMULTI) {
1752 res = dev_set_allmulti(slave_dev, 1);
1753 if (res)
1754 goto err_close;
1755 }
1756
1757 netif_addr_lock_bh(bond_dev);
1758 /* upload master's mc_list to new slave */
1759 netdev_for_each_mc_addr(ha, bond_dev)
1760 dev_mc_add(slave_dev, ha->addr);
1761 netif_addr_unlock_bh(bond_dev);
1762 }
1763
1764 if (bond->params.mode == BOND_MODE_8023AD) {
1765 /* add lacpdu mc addr to mc list */
1766 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1767
1768 dev_mc_add(slave_dev, lacpdu_multicast);
1769 }
1770
1771 bond_add_vlans_on_slave(bond, slave_dev);
1772
1773 write_lock_bh(&bond->lock);
1774
1775 bond_attach_slave(bond, new_slave);
1776
1777 new_slave->delay = 0;
1778 new_slave->link_failure_count = 0;
1779
1780 write_unlock_bh(&bond->lock);
1781
1782 bond_compute_features(bond);
1783
1784 bond_update_speed_duplex(new_slave);
1785
1786 read_lock(&bond->lock);
1787
1788 new_slave->last_arp_rx = jiffies -
1789 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1790
1791 if (bond->params.miimon && !bond->params.use_carrier) {
1792 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1793
1794 if ((link_reporting == -1) && !bond->params.arp_interval) {
1795 /*
1796 * miimon is set but a bonded network driver
1797 * does not support ETHTOOL/MII and
1798 * arp_interval is not set. Note: if
1799 * use_carrier is enabled, we will never go
1800 * here (because netif_carrier is always
1801 * supported); thus, we don't need to change
1802 * the messages for netif_carrier.
1803 */
1804 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",
1805 bond_dev->name, slave_dev->name);
1806 } else if (link_reporting == -1) {
1807 /* unable get link status using mii/ethtool */
1808 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",
1809 bond_dev->name, slave_dev->name);
1810 }
1811 }
1812
1813 /* check for initial state */
1814 if (bond->params.miimon) {
1815 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1816 if (bond->params.updelay) {
1817 new_slave->link = BOND_LINK_BACK;
1818 new_slave->delay = bond->params.updelay;
1819 } else {
1820 new_slave->link = BOND_LINK_UP;
1821 }
1822 } else {
1823 new_slave->link = BOND_LINK_DOWN;
1824 }
1825 } else if (bond->params.arp_interval) {
1826 new_slave->link = (netif_carrier_ok(slave_dev) ?
1827 BOND_LINK_UP : BOND_LINK_DOWN);
1828 } else {
1829 new_slave->link = BOND_LINK_UP;
1830 }
1831
1832 if (new_slave->link != BOND_LINK_DOWN)
1833 new_slave->jiffies = jiffies;
1834 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1835 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1836 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1837
1838 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1839 /* if there is a primary slave, remember it */
1840 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1841 bond->primary_slave = new_slave;
1842 bond->force_primary = true;
1843 }
1844 }
1845
1846 write_lock_bh(&bond->curr_slave_lock);
1847
1848 switch (bond->params.mode) {
1849 case BOND_MODE_ACTIVEBACKUP:
1850 bond_set_slave_inactive_flags(new_slave);
1851 bond_select_active_slave(bond);
1852 break;
1853 case BOND_MODE_8023AD:
1854 /* in 802.3ad mode, the internal mechanism
1855 * will activate the slaves in the selected
1856 * aggregator
1857 */
1858 bond_set_slave_inactive_flags(new_slave);
1859 /* if this is the first slave */
1860 if (bond->slave_cnt == 1) {
1861 SLAVE_AD_INFO(new_slave).id = 1;
1862 /* Initialize AD with the number of times that the AD timer is called in 1 second
1863 * can be called only after the mac address of the bond is set
1864 */
1865 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1866 } else {
1867 SLAVE_AD_INFO(new_slave).id =
1868 SLAVE_AD_INFO(new_slave->prev).id + 1;
1869 }
1870
1871 bond_3ad_bind_slave(new_slave);
1872 break;
1873 case BOND_MODE_TLB:
1874 case BOND_MODE_ALB:
1875 bond_set_active_slave(new_slave);
1876 bond_set_slave_inactive_flags(new_slave);
1877 bond_select_active_slave(bond);
1878 break;
1879 default:
1880 pr_debug("This slave is always active in trunk mode\n");
1881
1882 /* always active in trunk mode */
1883 bond_set_active_slave(new_slave);
1884
1885 /* In trunking mode there is little meaning to curr_active_slave
1886 * anyway (it holds no special properties of the bond device),
1887 * so we can change it without calling change_active_interface()
1888 */
1889 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1890 bond->curr_active_slave = new_slave;
1891
1892 break;
1893 } /* switch(bond_mode) */
1894
1895 write_unlock_bh(&bond->curr_slave_lock);
1896
1897 bond_set_carrier(bond);
1898
1899 #ifdef CONFIG_NET_POLL_CONTROLLER
1900 slave_dev->npinfo = bond_netpoll_info(bond);
1901 if (slave_dev->npinfo) {
1902 if (slave_enable_netpoll(new_slave)) {
1903 read_unlock(&bond->lock);
1904 pr_info("Error, %s: master_dev is using netpoll, "
1905 "but new slave device does not support netpoll.\n",
1906 bond_dev->name);
1907 res = -EBUSY;
1908 goto err_detach;
1909 }
1910 }
1911 #endif
1912
1913 read_unlock(&bond->lock);
1914
1915 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1916 if (res)
1917 goto err_detach;
1918
1919 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1920 new_slave);
1921 if (res) {
1922 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1923 goto err_dest_symlinks;
1924 }
1925
1926 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1927 bond_dev->name, slave_dev->name,
1928 bond_is_active_slave(new_slave) ? "n active" : " backup",
1929 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1930
1931 /* enslave is successful */
1932 return 0;
1933
1934 /* Undo stages on error */
1935 err_dest_symlinks:
1936 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1937
1938 err_detach:
1939 if (!USES_PRIMARY(bond->params.mode)) {
1940 netif_addr_lock_bh(bond_dev);
1941 bond_mc_list_flush(bond_dev, slave_dev);
1942 netif_addr_unlock_bh(bond_dev);
1943 }
1944 bond_del_vlans_from_slave(bond, slave_dev);
1945 write_lock_bh(&bond->lock);
1946 bond_detach_slave(bond, new_slave);
1947 if (bond->primary_slave == new_slave)
1948 bond->primary_slave = NULL;
1949 if (bond->curr_active_slave == new_slave) {
1950 bond_change_active_slave(bond, NULL);
1951 write_unlock_bh(&bond->lock);
1952 read_lock(&bond->lock);
1953 write_lock_bh(&bond->curr_slave_lock);
1954 bond_select_active_slave(bond);
1955 write_unlock_bh(&bond->curr_slave_lock);
1956 read_unlock(&bond->lock);
1957 } else {
1958 write_unlock_bh(&bond->lock);
1959 }
1960 slave_disable_netpoll(new_slave);
1961
1962 err_close:
1963 slave_dev->priv_flags &= ~IFF_BONDING;
1964 dev_close(slave_dev);
1965
1966 err_unset_master:
1967 bond_upper_dev_unlink(bond_dev, slave_dev);
1968
1969 err_restore_mac:
1970 if (!bond->params.fail_over_mac) {
1971 /* XXX TODO - fom follow mode needs to change master's
1972 * MAC if this slave's MAC is in use by the bond, or at
1973 * least print a warning.
1974 */
1975 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1976 addr.sa_family = slave_dev->type;
1977 dev_set_mac_address(slave_dev, &addr);
1978 }
1979
1980 err_restore_mtu:
1981 dev_set_mtu(slave_dev, new_slave->original_mtu);
1982
1983 err_free:
1984 kfree(new_slave);
1985
1986 err_undo_flags:
1987 bond_compute_features(bond);
1988 /* Enslave of first slave has failed and we need to fix master's mac */
1989 if (bond->slave_cnt == 0 &&
1990 ether_addr_equal(bond_dev->dev_addr, slave_dev->dev_addr))
1991 eth_hw_addr_random(bond_dev);
1992
1993 return res;
1994 }
1995
1996 /*
1997 * Try to release the slave device <slave> from the bond device <master>
1998 * It is legal to access curr_active_slave without a lock because all the function
1999 * is write-locked. If "all" is true it means that the function is being called
2000 * while destroying a bond interface and all slaves are being released.
2001 *
2002 * The rules for slave state should be:
2003 * for Active/Backup:
2004 * Active stays on all backups go down
2005 * for Bonded connections:
2006 * The first up interface should be left on and all others downed.
2007 */
2008 static int __bond_release_one(struct net_device *bond_dev,
2009 struct net_device *slave_dev,
2010 bool all)
2011 {
2012 struct bonding *bond = netdev_priv(bond_dev);
2013 struct slave *slave, *oldcurrent;
2014 struct sockaddr addr;
2015 int old_flags = bond_dev->flags;
2016 netdev_features_t old_features = bond_dev->features;
2017
2018 /* slave is not a slave or master is not master of this slave */
2019 if (!(slave_dev->flags & IFF_SLAVE) ||
2020 !netdev_has_upper_dev(slave_dev, bond_dev)) {
2021 pr_err("%s: Error: cannot release %s.\n",
2022 bond_dev->name, slave_dev->name);
2023 return -EINVAL;
2024 }
2025
2026 block_netpoll_tx();
2027 write_lock_bh(&bond->lock);
2028
2029 slave = bond_get_slave_by_dev(bond, slave_dev);
2030 if (!slave) {
2031 /* not a slave of this bond */
2032 pr_info("%s: %s not enslaved\n",
2033 bond_dev->name, slave_dev->name);
2034 write_unlock_bh(&bond->lock);
2035 unblock_netpoll_tx();
2036 return -EINVAL;
2037 }
2038
2039 write_unlock_bh(&bond->lock);
2040 /* unregister rx_handler early so bond_handle_frame wouldn't be called
2041 * for this slave anymore.
2042 */
2043 netdev_rx_handler_unregister(slave_dev);
2044 write_lock_bh(&bond->lock);
2045
2046 if (!all && !bond->params.fail_over_mac) {
2047 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
2048 bond->slave_cnt > 1)
2049 pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
2050 bond_dev->name, slave_dev->name,
2051 slave->perm_hwaddr,
2052 bond_dev->name, slave_dev->name);
2053 }
2054
2055 /* Inform AD package of unbinding of slave. */
2056 if (bond->params.mode == BOND_MODE_8023AD) {
2057 /* must be called before the slave is
2058 * detached from the list
2059 */
2060 bond_3ad_unbind_slave(slave);
2061 }
2062
2063 pr_info("%s: releasing %s interface %s\n",
2064 bond_dev->name,
2065 bond_is_active_slave(slave) ? "active" : "backup",
2066 slave_dev->name);
2067
2068 oldcurrent = bond->curr_active_slave;
2069
2070 bond->current_arp_slave = NULL;
2071
2072 /* release the slave from its bond */
2073 bond_detach_slave(bond, slave);
2074
2075 if (bond->primary_slave == slave)
2076 bond->primary_slave = NULL;
2077
2078 if (oldcurrent == slave)
2079 bond_change_active_slave(bond, NULL);
2080
2081 if (bond_is_lb(bond)) {
2082 /* Must be called only after the slave has been
2083 * detached from the list and the curr_active_slave
2084 * has been cleared (if our_slave == old_current),
2085 * but before a new active slave is selected.
2086 */
2087 write_unlock_bh(&bond->lock);
2088 bond_alb_deinit_slave(bond, slave);
2089 write_lock_bh(&bond->lock);
2090 }
2091
2092 if (all) {
2093 bond->curr_active_slave = NULL;
2094 } else if (oldcurrent == slave) {
2095 /*
2096 * Note that we hold RTNL over this sequence, so there
2097 * is no concern that another slave add/remove event
2098 * will interfere.
2099 */
2100 write_unlock_bh(&bond->lock);
2101 read_lock(&bond->lock);
2102 write_lock_bh(&bond->curr_slave_lock);
2103
2104 bond_select_active_slave(bond);
2105
2106 write_unlock_bh(&bond->curr_slave_lock);
2107 read_unlock(&bond->lock);
2108 write_lock_bh(&bond->lock);
2109 }
2110
2111 if (bond->slave_cnt == 0) {
2112 bond_set_carrier(bond);
2113 eth_hw_addr_random(bond_dev);
2114 bond->dev_addr_from_first = true;
2115
2116 if (bond_vlan_used(bond)) {
2117 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2118 bond_dev->name, bond_dev->name);
2119 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2120 bond_dev->name);
2121 }
2122 }
2123
2124 write_unlock_bh(&bond->lock);
2125 unblock_netpoll_tx();
2126
2127 if (bond->slave_cnt == 0) {
2128 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2129 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2130 }
2131
2132 bond_compute_features(bond);
2133 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2134 (old_features & NETIF_F_VLAN_CHALLENGED))
2135 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2136 bond_dev->name, slave_dev->name, bond_dev->name);
2137
2138 /* must do this from outside any spinlocks */
2139 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2140
2141 bond_del_vlans_from_slave(bond, slave_dev);
2142
2143 /* If the mode USES_PRIMARY, then we should only remove its
2144 * promisc and mc settings if it was the curr_active_slave, but that was
2145 * already taken care of above when we detached the slave
2146 */
2147 if (!USES_PRIMARY(bond->params.mode)) {
2148 /* unset promiscuity level from slave
2149 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2150 * of the IFF_PROMISC flag in the bond_dev, but we need the
2151 * value of that flag before that change, as that was the value
2152 * when this slave was attached, so we cache at the start of the
2153 * function and use it here. Same goes for ALLMULTI below
2154 */
2155 if (old_flags & IFF_PROMISC)
2156 dev_set_promiscuity(slave_dev, -1);
2157
2158 /* unset allmulti level from slave */
2159 if (old_flags & IFF_ALLMULTI)
2160 dev_set_allmulti(slave_dev, -1);
2161
2162 /* flush master's mc_list from slave */
2163 netif_addr_lock_bh(bond_dev);
2164 bond_mc_list_flush(bond_dev, slave_dev);
2165 netif_addr_unlock_bh(bond_dev);
2166 }
2167
2168 bond_upper_dev_unlink(bond_dev, slave_dev);
2169
2170 slave_disable_netpoll(slave);
2171
2172 /* close slave before restoring its mac address */
2173 dev_close(slave_dev);
2174
2175 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2176 /* restore original ("permanent") mac address */
2177 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2178 addr.sa_family = slave_dev->type;
2179 dev_set_mac_address(slave_dev, &addr);
2180 }
2181
2182 dev_set_mtu(slave_dev, slave->original_mtu);
2183
2184 slave_dev->priv_flags &= ~IFF_BONDING;
2185
2186 kfree(slave);
2187
2188 return 0; /* deletion OK */
2189 }
2190
2191 /* A wrapper used because of ndo_del_link */
2192 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2193 {
2194 return __bond_release_one(bond_dev, slave_dev, false);
2195 }
2196
2197 /*
2198 * First release a slave and then destroy the bond if no more slaves are left.
2199 * Must be under rtnl_lock when this function is called.
2200 */
2201 static int bond_release_and_destroy(struct net_device *bond_dev,
2202 struct net_device *slave_dev)
2203 {
2204 struct bonding *bond = netdev_priv(bond_dev);
2205 int ret;
2206
2207 ret = bond_release(bond_dev, slave_dev);
2208 if ((ret == 0) && (bond->slave_cnt == 0)) {
2209 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2210 pr_info("%s: destroying bond %s.\n",
2211 bond_dev->name, bond_dev->name);
2212 bond_remove_proc_entry(bond);
2213 unregister_netdevice(bond_dev);
2214 }
2215 return ret;
2216 }
2217
2218 /*
2219 * This function changes the active slave to slave <slave_dev>.
2220 * It returns -EINVAL in the following cases.
2221 * - <slave_dev> is not found in the list.
2222 * - There is not active slave now.
2223 * - <slave_dev> is already active.
2224 * - The link state of <slave_dev> is not BOND_LINK_UP.
2225 * - <slave_dev> is not running.
2226 * In these cases, this function does nothing.
2227 * In the other cases, current_slave pointer is changed and 0 is returned.
2228 */
2229 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2230 {
2231 struct bonding *bond = netdev_priv(bond_dev);
2232 struct slave *old_active = NULL;
2233 struct slave *new_active = NULL;
2234 int res = 0;
2235
2236 if (!USES_PRIMARY(bond->params.mode))
2237 return -EINVAL;
2238
2239 /* Verify that bond_dev is indeed the master of slave_dev */
2240 if (!(slave_dev->flags & IFF_SLAVE) ||
2241 !netdev_has_upper_dev(slave_dev, bond_dev))
2242 return -EINVAL;
2243
2244 read_lock(&bond->lock);
2245
2246 read_lock(&bond->curr_slave_lock);
2247 old_active = bond->curr_active_slave;
2248 read_unlock(&bond->curr_slave_lock);
2249
2250 new_active = bond_get_slave_by_dev(bond, slave_dev);
2251
2252 /*
2253 * Changing to the current active: do nothing; return success.
2254 */
2255 if (new_active && (new_active == old_active)) {
2256 read_unlock(&bond->lock);
2257 return 0;
2258 }
2259
2260 if ((new_active) &&
2261 (old_active) &&
2262 (new_active->link == BOND_LINK_UP) &&
2263 IS_UP(new_active->dev)) {
2264 block_netpoll_tx();
2265 write_lock_bh(&bond->curr_slave_lock);
2266 bond_change_active_slave(bond, new_active);
2267 write_unlock_bh(&bond->curr_slave_lock);
2268 unblock_netpoll_tx();
2269 } else
2270 res = -EINVAL;
2271
2272 read_unlock(&bond->lock);
2273
2274 return res;
2275 }
2276
2277 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2278 {
2279 struct bonding *bond = netdev_priv(bond_dev);
2280
2281 info->bond_mode = bond->params.mode;
2282 info->miimon = bond->params.miimon;
2283
2284 read_lock(&bond->lock);
2285 info->num_slaves = bond->slave_cnt;
2286 read_unlock(&bond->lock);
2287
2288 return 0;
2289 }
2290
2291 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2292 {
2293 struct bonding *bond = netdev_priv(bond_dev);
2294 struct slave *slave;
2295 int i, res = -ENODEV;
2296
2297 read_lock(&bond->lock);
2298
2299 bond_for_each_slave(bond, slave, i) {
2300 if (i == (int)info->slave_id) {
2301 res = 0;
2302 strcpy(info->slave_name, slave->dev->name);
2303 info->link = slave->link;
2304 info->state = bond_slave_state(slave);
2305 info->link_failure_count = slave->link_failure_count;
2306 break;
2307 }
2308 }
2309
2310 read_unlock(&bond->lock);
2311
2312 return res;
2313 }
2314
2315 /*-------------------------------- Monitoring -------------------------------*/
2316
2317
2318 static int bond_miimon_inspect(struct bonding *bond)
2319 {
2320 struct slave *slave;
2321 int i, link_state, commit = 0;
2322 bool ignore_updelay;
2323
2324 ignore_updelay = !bond->curr_active_slave ? true : false;
2325
2326 bond_for_each_slave(bond, slave, i) {
2327 slave->new_link = BOND_LINK_NOCHANGE;
2328
2329 link_state = bond_check_dev_link(bond, slave->dev, 0);
2330
2331 switch (slave->link) {
2332 case BOND_LINK_UP:
2333 if (link_state)
2334 continue;
2335
2336 slave->link = BOND_LINK_FAIL;
2337 slave->delay = bond->params.downdelay;
2338 if (slave->delay) {
2339 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2340 bond->dev->name,
2341 (bond->params.mode ==
2342 BOND_MODE_ACTIVEBACKUP) ?
2343 (bond_is_active_slave(slave) ?
2344 "active " : "backup ") : "",
2345 slave->dev->name,
2346 bond->params.downdelay * bond->params.miimon);
2347 }
2348 /*FALLTHRU*/
2349 case BOND_LINK_FAIL:
2350 if (link_state) {
2351 /*
2352 * recovered before downdelay expired
2353 */
2354 slave->link = BOND_LINK_UP;
2355 slave->jiffies = jiffies;
2356 pr_info("%s: link status up again after %d ms for interface %s.\n",
2357 bond->dev->name,
2358 (bond->params.downdelay - slave->delay) *
2359 bond->params.miimon,
2360 slave->dev->name);
2361 continue;
2362 }
2363
2364 if (slave->delay <= 0) {
2365 slave->new_link = BOND_LINK_DOWN;
2366 commit++;
2367 continue;
2368 }
2369
2370 slave->delay--;
2371 break;
2372
2373 case BOND_LINK_DOWN:
2374 if (!link_state)
2375 continue;
2376
2377 slave->link = BOND_LINK_BACK;
2378 slave->delay = bond->params.updelay;
2379
2380 if (slave->delay) {
2381 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2382 bond->dev->name, slave->dev->name,
2383 ignore_updelay ? 0 :
2384 bond->params.updelay *
2385 bond->params.miimon);
2386 }
2387 /*FALLTHRU*/
2388 case BOND_LINK_BACK:
2389 if (!link_state) {
2390 slave->link = BOND_LINK_DOWN;
2391 pr_info("%s: link status down again after %d ms for interface %s.\n",
2392 bond->dev->name,
2393 (bond->params.updelay - slave->delay) *
2394 bond->params.miimon,
2395 slave->dev->name);
2396
2397 continue;
2398 }
2399
2400 if (ignore_updelay)
2401 slave->delay = 0;
2402
2403 if (slave->delay <= 0) {
2404 slave->new_link = BOND_LINK_UP;
2405 commit++;
2406 ignore_updelay = false;
2407 continue;
2408 }
2409
2410 slave->delay--;
2411 break;
2412 }
2413 }
2414
2415 return commit;
2416 }
2417
2418 static void bond_miimon_commit(struct bonding *bond)
2419 {
2420 struct slave *slave;
2421 int i;
2422
2423 bond_for_each_slave(bond, slave, i) {
2424 switch (slave->new_link) {
2425 case BOND_LINK_NOCHANGE:
2426 continue;
2427
2428 case BOND_LINK_UP:
2429 slave->link = BOND_LINK_UP;
2430 slave->jiffies = jiffies;
2431
2432 if (bond->params.mode == BOND_MODE_8023AD) {
2433 /* prevent it from being the active one */
2434 bond_set_backup_slave(slave);
2435 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2436 /* make it immediately active */
2437 bond_set_active_slave(slave);
2438 } else if (slave != bond->primary_slave) {
2439 /* prevent it from being the active one */
2440 bond_set_backup_slave(slave);
2441 }
2442
2443 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2444 bond->dev->name, slave->dev->name,
2445 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2446 slave->duplex ? "full" : "half");
2447
2448 /* notify ad that the link status has changed */
2449 if (bond->params.mode == BOND_MODE_8023AD)
2450 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2451
2452 if (bond_is_lb(bond))
2453 bond_alb_handle_link_change(bond, slave,
2454 BOND_LINK_UP);
2455
2456 if (!bond->curr_active_slave ||
2457 (slave == bond->primary_slave))
2458 goto do_failover;
2459
2460 continue;
2461
2462 case BOND_LINK_DOWN:
2463 if (slave->link_failure_count < UINT_MAX)
2464 slave->link_failure_count++;
2465
2466 slave->link = BOND_LINK_DOWN;
2467
2468 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2469 bond->params.mode == BOND_MODE_8023AD)
2470 bond_set_slave_inactive_flags(slave);
2471
2472 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2473 bond->dev->name, slave->dev->name);
2474
2475 if (bond->params.mode == BOND_MODE_8023AD)
2476 bond_3ad_handle_link_change(slave,
2477 BOND_LINK_DOWN);
2478
2479 if (bond_is_lb(bond))
2480 bond_alb_handle_link_change(bond, slave,
2481 BOND_LINK_DOWN);
2482
2483 if (slave == bond->curr_active_slave)
2484 goto do_failover;
2485
2486 continue;
2487
2488 default:
2489 pr_err("%s: invalid new link %d on slave %s\n",
2490 bond->dev->name, slave->new_link,
2491 slave->dev->name);
2492 slave->new_link = BOND_LINK_NOCHANGE;
2493
2494 continue;
2495 }
2496
2497 do_failover:
2498 ASSERT_RTNL();
2499 block_netpoll_tx();
2500 write_lock_bh(&bond->curr_slave_lock);
2501 bond_select_active_slave(bond);
2502 write_unlock_bh(&bond->curr_slave_lock);
2503 unblock_netpoll_tx();
2504 }
2505
2506 bond_set_carrier(bond);
2507 }
2508
2509 /*
2510 * bond_mii_monitor
2511 *
2512 * Really a wrapper that splits the mii monitor into two phases: an
2513 * inspection, then (if inspection indicates something needs to be done)
2514 * an acquisition of appropriate locks followed by a commit phase to
2515 * implement whatever link state changes are indicated.
2516 */
2517 void bond_mii_monitor(struct work_struct *work)
2518 {
2519 struct bonding *bond = container_of(work, struct bonding,
2520 mii_work.work);
2521 bool should_notify_peers = false;
2522 unsigned long delay;
2523
2524 read_lock(&bond->lock);
2525
2526 delay = msecs_to_jiffies(bond->params.miimon);
2527
2528 if (bond->slave_cnt == 0)
2529 goto re_arm;
2530
2531 should_notify_peers = bond_should_notify_peers(bond);
2532
2533 if (bond_miimon_inspect(bond)) {
2534 read_unlock(&bond->lock);
2535
2536 /* Race avoidance with bond_close cancel of workqueue */
2537 if (!rtnl_trylock()) {
2538 read_lock(&bond->lock);
2539 delay = 1;
2540 should_notify_peers = false;
2541 goto re_arm;
2542 }
2543
2544 read_lock(&bond->lock);
2545
2546 bond_miimon_commit(bond);
2547
2548 read_unlock(&bond->lock);
2549 rtnl_unlock(); /* might sleep, hold no other locks */
2550 read_lock(&bond->lock);
2551 }
2552
2553 re_arm:
2554 if (bond->params.miimon)
2555 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2556
2557 read_unlock(&bond->lock);
2558
2559 if (should_notify_peers) {
2560 if (!rtnl_trylock()) {
2561 read_lock(&bond->lock);
2562 bond->send_peer_notif++;
2563 read_unlock(&bond->lock);
2564 return;
2565 }
2566 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2567 rtnl_unlock();
2568 }
2569 }
2570
2571 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2572 {
2573 struct vlan_entry *vlan;
2574 struct net_device *vlan_dev;
2575
2576 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2577 return 1;
2578
2579 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2580 rcu_read_lock();
2581 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
2582 vlan->vlan_id);
2583 rcu_read_unlock();
2584 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2585 return 1;
2586 }
2587
2588 return 0;
2589 }
2590
2591 /*
2592 * We go to the (large) trouble of VLAN tagging ARP frames because
2593 * switches in VLAN mode (especially if ports are configured as
2594 * "native" to a VLAN) might not pass non-tagged frames.
2595 */
2596 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2597 {
2598 struct sk_buff *skb;
2599
2600 pr_debug("arp %d on slave %s: dst %pI4 src %pI4 vid %d\n", arp_op,
2601 slave_dev->name, &dest_ip, &src_ip, vlan_id);
2602
2603 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2604 NULL, slave_dev->dev_addr, NULL);
2605
2606 if (!skb) {
2607 pr_err("ARP packet allocation failed\n");
2608 return;
2609 }
2610 if (vlan_id) {
2611 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2612 if (!skb) {
2613 pr_err("failed to insert VLAN tag\n");
2614 return;
2615 }
2616 }
2617 arp_xmit(skb);
2618 }
2619
2620
2621 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2622 {
2623 int i, vlan_id;
2624 __be32 *targets = bond->params.arp_targets;
2625 struct vlan_entry *vlan;
2626 struct net_device *vlan_dev = NULL;
2627 struct rtable *rt;
2628
2629 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2630 __be32 addr;
2631 if (!targets[i])
2632 break;
2633 pr_debug("basa: target %pI4\n", &targets[i]);
2634 if (!bond_vlan_used(bond)) {
2635 pr_debug("basa: empty vlan: arp_send\n");
2636 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2637 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2638 addr, 0);
2639 continue;
2640 }
2641
2642 /*
2643 * If VLANs are configured, we do a route lookup to
2644 * determine which VLAN interface would be used, so we
2645 * can tag the ARP with the proper VLAN tag.
2646 */
2647 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2648 RTO_ONLINK, 0);
2649 if (IS_ERR(rt)) {
2650 if (net_ratelimit()) {
2651 pr_warning("%s: no route to arp_ip_target %pI4\n",
2652 bond->dev->name, &targets[i]);
2653 }
2654 continue;
2655 }
2656
2657 /*
2658 * This target is not on a VLAN
2659 */
2660 if (rt->dst.dev == bond->dev) {
2661 ip_rt_put(rt);
2662 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2663 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2664 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2665 addr, 0);
2666 continue;
2667 }
2668
2669 vlan_id = 0;
2670 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2671 rcu_read_lock();
2672 vlan_dev = __vlan_find_dev_deep(bond->dev,
2673 htons(ETH_P_8021Q),
2674 vlan->vlan_id);
2675 rcu_read_unlock();
2676 if (vlan_dev == rt->dst.dev) {
2677 vlan_id = vlan->vlan_id;
2678 pr_debug("basa: vlan match on %s %d\n",
2679 vlan_dev->name, vlan_id);
2680 break;
2681 }
2682 }
2683
2684 if (vlan_id && vlan_dev) {
2685 ip_rt_put(rt);
2686 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2687 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2688 addr, vlan_id);
2689 continue;
2690 }
2691
2692 if (net_ratelimit()) {
2693 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2694 bond->dev->name, &targets[i],
2695 rt->dst.dev ? rt->dst.dev->name : "NULL");
2696 }
2697 ip_rt_put(rt);
2698 }
2699 }
2700
2701 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2702 {
2703 int i;
2704 __be32 *targets = bond->params.arp_targets;
2705
2706 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2707 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2708 &sip, &tip, i, &targets[i],
2709 bond_has_this_ip(bond, tip));
2710 if (sip == targets[i]) {
2711 if (bond_has_this_ip(bond, tip))
2712 slave->last_arp_rx = jiffies;
2713 return;
2714 }
2715 }
2716 }
2717
2718 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2719 struct slave *slave)
2720 {
2721 struct arphdr *arp = (struct arphdr *)skb->data;
2722 unsigned char *arp_ptr;
2723 __be32 sip, tip;
2724 int alen;
2725
2726 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2727 return RX_HANDLER_ANOTHER;
2728
2729 read_lock(&bond->lock);
2730 alen = arp_hdr_len(bond->dev);
2731
2732 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2733 bond->dev->name, skb->dev->name);
2734
2735 if (alen > skb_headlen(skb)) {
2736 arp = kmalloc(alen, GFP_ATOMIC);
2737 if (!arp)
2738 goto out_unlock;
2739 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2740 goto out_unlock;
2741 }
2742
2743 if (arp->ar_hln != bond->dev->addr_len ||
2744 skb->pkt_type == PACKET_OTHERHOST ||
2745 skb->pkt_type == PACKET_LOOPBACK ||
2746 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2747 arp->ar_pro != htons(ETH_P_IP) ||
2748 arp->ar_pln != 4)
2749 goto out_unlock;
2750
2751 arp_ptr = (unsigned char *)(arp + 1);
2752 arp_ptr += bond->dev->addr_len;
2753 memcpy(&sip, arp_ptr, 4);
2754 arp_ptr += 4 + bond->dev->addr_len;
2755 memcpy(&tip, arp_ptr, 4);
2756
2757 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2758 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2759 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2760 &sip, &tip);
2761
2762 /*
2763 * Backup slaves won't see the ARP reply, but do come through
2764 * here for each ARP probe (so we swap the sip/tip to validate
2765 * the probe). In a "redundant switch, common router" type of
2766 * configuration, the ARP probe will (hopefully) travel from
2767 * the active, through one switch, the router, then the other
2768 * switch before reaching the backup.
2769 */
2770 if (bond_is_active_slave(slave))
2771 bond_validate_arp(bond, slave, sip, tip);
2772 else
2773 bond_validate_arp(bond, slave, tip, sip);
2774
2775 out_unlock:
2776 read_unlock(&bond->lock);
2777 if (arp != (struct arphdr *)skb->data)
2778 kfree(arp);
2779 return RX_HANDLER_ANOTHER;
2780 }
2781
2782 /*
2783 * this function is called regularly to monitor each slave's link
2784 * ensuring that traffic is being sent and received when arp monitoring
2785 * is used in load-balancing mode. if the adapter has been dormant, then an
2786 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2787 * arp monitoring in active backup mode.
2788 */
2789 void bond_loadbalance_arp_mon(struct work_struct *work)
2790 {
2791 struct bonding *bond = container_of(work, struct bonding,
2792 arp_work.work);
2793 struct slave *slave, *oldcurrent;
2794 int do_failover = 0;
2795 int delta_in_ticks, extra_ticks;
2796 int i;
2797
2798 read_lock(&bond->lock);
2799
2800 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2801 extra_ticks = delta_in_ticks / 2;
2802
2803 if (bond->slave_cnt == 0)
2804 goto re_arm;
2805
2806 read_lock(&bond->curr_slave_lock);
2807 oldcurrent = bond->curr_active_slave;
2808 read_unlock(&bond->curr_slave_lock);
2809
2810 /* see if any of the previous devices are up now (i.e. they have
2811 * xmt and rcv traffic). the curr_active_slave does not come into
2812 * the picture unless it is null. also, slave->jiffies is not needed
2813 * here because we send an arp on each slave and give a slave as
2814 * long as it needs to get the tx/rx within the delta.
2815 * TODO: what about up/down delay in arp mode? it wasn't here before
2816 * so it can wait
2817 */
2818 bond_for_each_slave(bond, slave, i) {
2819 unsigned long trans_start = dev_trans_start(slave->dev);
2820
2821 if (slave->link != BOND_LINK_UP) {
2822 if (time_in_range(jiffies,
2823 trans_start - delta_in_ticks,
2824 trans_start + delta_in_ticks + extra_ticks) &&
2825 time_in_range(jiffies,
2826 slave->dev->last_rx - delta_in_ticks,
2827 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2828
2829 slave->link = BOND_LINK_UP;
2830 bond_set_active_slave(slave);
2831
2832 /* primary_slave has no meaning in round-robin
2833 * mode. the window of a slave being up and
2834 * curr_active_slave being null after enslaving
2835 * is closed.
2836 */
2837 if (!oldcurrent) {
2838 pr_info("%s: link status definitely up for interface %s, ",
2839 bond->dev->name,
2840 slave->dev->name);
2841 do_failover = 1;
2842 } else {
2843 pr_info("%s: interface %s is now up\n",
2844 bond->dev->name,
2845 slave->dev->name);
2846 }
2847 }
2848 } else {
2849 /* slave->link == BOND_LINK_UP */
2850
2851 /* not all switches will respond to an arp request
2852 * when the source ip is 0, so don't take the link down
2853 * if we don't know our ip yet
2854 */
2855 if (!time_in_range(jiffies,
2856 trans_start - delta_in_ticks,
2857 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2858 !time_in_range(jiffies,
2859 slave->dev->last_rx - delta_in_ticks,
2860 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2861
2862 slave->link = BOND_LINK_DOWN;
2863 bond_set_backup_slave(slave);
2864
2865 if (slave->link_failure_count < UINT_MAX)
2866 slave->link_failure_count++;
2867
2868 pr_info("%s: interface %s is now down.\n",
2869 bond->dev->name,
2870 slave->dev->name);
2871
2872 if (slave == oldcurrent)
2873 do_failover = 1;
2874 }
2875 }
2876
2877 /* note: if switch is in round-robin mode, all links
2878 * must tx arp to ensure all links rx an arp - otherwise
2879 * links may oscillate or not come up at all; if switch is
2880 * in something like xor mode, there is nothing we can
2881 * do - all replies will be rx'ed on same link causing slaves
2882 * to be unstable during low/no traffic periods
2883 */
2884 if (IS_UP(slave->dev))
2885 bond_arp_send_all(bond, slave);
2886 }
2887
2888 if (do_failover) {
2889 block_netpoll_tx();
2890 write_lock_bh(&bond->curr_slave_lock);
2891
2892 bond_select_active_slave(bond);
2893
2894 write_unlock_bh(&bond->curr_slave_lock);
2895 unblock_netpoll_tx();
2896 }
2897
2898 re_arm:
2899 if (bond->params.arp_interval)
2900 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2901
2902 read_unlock(&bond->lock);
2903 }
2904
2905 /*
2906 * Called to inspect slaves for active-backup mode ARP monitor link state
2907 * changes. Sets new_link in slaves to specify what action should take
2908 * place for the slave. Returns 0 if no changes are found, >0 if changes
2909 * to link states must be committed.
2910 *
2911 * Called with bond->lock held for read.
2912 */
2913 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2914 {
2915 struct slave *slave;
2916 int i, commit = 0;
2917 unsigned long trans_start;
2918 int extra_ticks;
2919
2920 /* All the time comparisons below need some extra time. Otherwise, on
2921 * fast networks the ARP probe/reply may arrive within the same jiffy
2922 * as it was sent. Then, the next time the ARP monitor is run, one
2923 * arp_interval will already have passed in the comparisons.
2924 */
2925 extra_ticks = delta_in_ticks / 2;
2926
2927 bond_for_each_slave(bond, slave, i) {
2928 slave->new_link = BOND_LINK_NOCHANGE;
2929
2930 if (slave->link != BOND_LINK_UP) {
2931 if (time_in_range(jiffies,
2932 slave_last_rx(bond, slave) - delta_in_ticks,
2933 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2934
2935 slave->new_link = BOND_LINK_UP;
2936 commit++;
2937 }
2938
2939 continue;
2940 }
2941
2942 /*
2943 * Give slaves 2*delta after being enslaved or made
2944 * active. This avoids bouncing, as the last receive
2945 * times need a full ARP monitor cycle to be updated.
2946 */
2947 if (time_in_range(jiffies,
2948 slave->jiffies - delta_in_ticks,
2949 slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2950 continue;
2951
2952 /*
2953 * Backup slave is down if:
2954 * - No current_arp_slave AND
2955 * - more than 3*delta since last receive AND
2956 * - the bond has an IP address
2957 *
2958 * Note: a non-null current_arp_slave indicates
2959 * the curr_active_slave went down and we are
2960 * searching for a new one; under this condition
2961 * we only take the curr_active_slave down - this
2962 * gives each slave a chance to tx/rx traffic
2963 * before being taken out
2964 */
2965 if (!bond_is_active_slave(slave) &&
2966 !bond->current_arp_slave &&
2967 !time_in_range(jiffies,
2968 slave_last_rx(bond, slave) - delta_in_ticks,
2969 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2970
2971 slave->new_link = BOND_LINK_DOWN;
2972 commit++;
2973 }
2974
2975 /*
2976 * Active slave is down if:
2977 * - more than 2*delta since transmitting OR
2978 * - (more than 2*delta since receive AND
2979 * the bond has an IP address)
2980 */
2981 trans_start = dev_trans_start(slave->dev);
2982 if (bond_is_active_slave(slave) &&
2983 (!time_in_range(jiffies,
2984 trans_start - delta_in_ticks,
2985 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2986 !time_in_range(jiffies,
2987 slave_last_rx(bond, slave) - delta_in_ticks,
2988 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2989
2990 slave->new_link = BOND_LINK_DOWN;
2991 commit++;
2992 }
2993 }
2994
2995 return commit;
2996 }
2997
2998 /*
2999 * Called to commit link state changes noted by inspection step of
3000 * active-backup mode ARP monitor.
3001 *
3002 * Called with RTNL and bond->lock for read.
3003 */
3004 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
3005 {
3006 struct slave *slave;
3007 int i;
3008 unsigned long trans_start;
3009
3010 bond_for_each_slave(bond, slave, i) {
3011 switch (slave->new_link) {
3012 case BOND_LINK_NOCHANGE:
3013 continue;
3014
3015 case BOND_LINK_UP:
3016 trans_start = dev_trans_start(slave->dev);
3017 if ((!bond->curr_active_slave &&
3018 time_in_range(jiffies,
3019 trans_start - delta_in_ticks,
3020 trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
3021 bond->curr_active_slave != slave) {
3022 slave->link = BOND_LINK_UP;
3023 if (bond->current_arp_slave) {
3024 bond_set_slave_inactive_flags(
3025 bond->current_arp_slave);
3026 bond->current_arp_slave = NULL;
3027 }
3028
3029 pr_info("%s: link status definitely up for interface %s.\n",
3030 bond->dev->name, slave->dev->name);
3031
3032 if (!bond->curr_active_slave ||
3033 (slave == bond->primary_slave))
3034 goto do_failover;
3035
3036 }
3037
3038 continue;
3039
3040 case BOND_LINK_DOWN:
3041 if (slave->link_failure_count < UINT_MAX)
3042 slave->link_failure_count++;
3043
3044 slave->link = BOND_LINK_DOWN;
3045 bond_set_slave_inactive_flags(slave);
3046
3047 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3048 bond->dev->name, slave->dev->name);
3049
3050 if (slave == bond->curr_active_slave) {
3051 bond->current_arp_slave = NULL;
3052 goto do_failover;
3053 }
3054
3055 continue;
3056
3057 default:
3058 pr_err("%s: impossible: new_link %d on slave %s\n",
3059 bond->dev->name, slave->new_link,
3060 slave->dev->name);
3061 continue;
3062 }
3063
3064 do_failover:
3065 ASSERT_RTNL();
3066 block_netpoll_tx();
3067 write_lock_bh(&bond->curr_slave_lock);
3068 bond_select_active_slave(bond);
3069 write_unlock_bh(&bond->curr_slave_lock);
3070 unblock_netpoll_tx();
3071 }
3072
3073 bond_set_carrier(bond);
3074 }
3075
3076 /*
3077 * Send ARP probes for active-backup mode ARP monitor.
3078 *
3079 * Called with bond->lock held for read.
3080 */
3081 static void bond_ab_arp_probe(struct bonding *bond)
3082 {
3083 struct slave *slave;
3084 int i;
3085
3086 read_lock(&bond->curr_slave_lock);
3087
3088 if (bond->current_arp_slave && bond->curr_active_slave)
3089 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3090 bond->current_arp_slave->dev->name,
3091 bond->curr_active_slave->dev->name);
3092
3093 if (bond->curr_active_slave) {
3094 bond_arp_send_all(bond, bond->curr_active_slave);
3095 read_unlock(&bond->curr_slave_lock);
3096 return;
3097 }
3098
3099 read_unlock(&bond->curr_slave_lock);
3100
3101 /* if we don't have a curr_active_slave, search for the next available
3102 * backup slave from the current_arp_slave and make it the candidate
3103 * for becoming the curr_active_slave
3104 */
3105
3106 if (!bond->current_arp_slave) {
3107 bond->current_arp_slave = bond->first_slave;
3108 if (!bond->current_arp_slave)
3109 return;
3110 }
3111
3112 bond_set_slave_inactive_flags(bond->current_arp_slave);
3113
3114 /* search for next candidate */
3115 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3116 if (IS_UP(slave->dev)) {
3117 slave->link = BOND_LINK_BACK;
3118 bond_set_slave_active_flags(slave);
3119 bond_arp_send_all(bond, slave);
3120 slave->jiffies = jiffies;
3121 bond->current_arp_slave = slave;
3122 break;
3123 }
3124
3125 /* if the link state is up at this point, we
3126 * mark it down - this can happen if we have
3127 * simultaneous link failures and
3128 * reselect_active_interface doesn't make this
3129 * one the current slave so it is still marked
3130 * up when it is actually down
3131 */
3132 if (slave->link == BOND_LINK_UP) {
3133 slave->link = BOND_LINK_DOWN;
3134 if (slave->link_failure_count < UINT_MAX)
3135 slave->link_failure_count++;
3136
3137 bond_set_slave_inactive_flags(slave);
3138
3139 pr_info("%s: backup interface %s is now down.\n",
3140 bond->dev->name, slave->dev->name);
3141 }
3142 }
3143 }
3144
3145 void bond_activebackup_arp_mon(struct work_struct *work)
3146 {
3147 struct bonding *bond = container_of(work, struct bonding,
3148 arp_work.work);
3149 bool should_notify_peers = false;
3150 int delta_in_ticks;
3151
3152 read_lock(&bond->lock);
3153
3154 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3155
3156 if (bond->slave_cnt == 0)
3157 goto re_arm;
3158
3159 should_notify_peers = bond_should_notify_peers(bond);
3160
3161 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3162 read_unlock(&bond->lock);
3163
3164 /* Race avoidance with bond_close flush of workqueue */
3165 if (!rtnl_trylock()) {
3166 read_lock(&bond->lock);
3167 delta_in_ticks = 1;
3168 should_notify_peers = false;
3169 goto re_arm;
3170 }
3171
3172 read_lock(&bond->lock);
3173
3174 bond_ab_arp_commit(bond, delta_in_ticks);
3175
3176 read_unlock(&bond->lock);
3177 rtnl_unlock();
3178 read_lock(&bond->lock);
3179 }
3180
3181 bond_ab_arp_probe(bond);
3182
3183 re_arm:
3184 if (bond->params.arp_interval)
3185 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3186
3187 read_unlock(&bond->lock);
3188
3189 if (should_notify_peers) {
3190 if (!rtnl_trylock()) {
3191 read_lock(&bond->lock);
3192 bond->send_peer_notif++;
3193 read_unlock(&bond->lock);
3194 return;
3195 }
3196 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3197 rtnl_unlock();
3198 }
3199 }
3200
3201 /*-------------------------- netdev event handling --------------------------*/
3202
3203 /*
3204 * Change device name
3205 */
3206 static int bond_event_changename(struct bonding *bond)
3207 {
3208 bond_remove_proc_entry(bond);
3209 bond_create_proc_entry(bond);
3210
3211 bond_debug_reregister(bond);
3212
3213 return NOTIFY_DONE;
3214 }
3215
3216 static int bond_master_netdev_event(unsigned long event,
3217 struct net_device *bond_dev)
3218 {
3219 struct bonding *event_bond = netdev_priv(bond_dev);
3220
3221 switch (event) {
3222 case NETDEV_CHANGENAME:
3223 return bond_event_changename(event_bond);
3224 case NETDEV_UNREGISTER:
3225 bond_remove_proc_entry(event_bond);
3226 break;
3227 case NETDEV_REGISTER:
3228 bond_create_proc_entry(event_bond);
3229 break;
3230 default:
3231 break;
3232 }
3233
3234 return NOTIFY_DONE;
3235 }
3236
3237 static int bond_slave_netdev_event(unsigned long event,
3238 struct net_device *slave_dev)
3239 {
3240 struct slave *slave = bond_slave_get_rtnl(slave_dev);
3241 struct bonding *bond;
3242 struct net_device *bond_dev;
3243 u32 old_speed;
3244 u8 old_duplex;
3245
3246 /* A netdev event can be generated while enslaving a device
3247 * before netdev_rx_handler_register is called in which case
3248 * slave will be NULL
3249 */
3250 if (!slave)
3251 return NOTIFY_DONE;
3252 bond_dev = slave->bond->dev;
3253 bond = slave->bond;
3254
3255 switch (event) {
3256 case NETDEV_UNREGISTER:
3257 if (bond->setup_by_slave)
3258 bond_release_and_destroy(bond_dev, slave_dev);
3259 else
3260 bond_release(bond_dev, slave_dev);
3261 break;
3262 case NETDEV_UP:
3263 case NETDEV_CHANGE:
3264 old_speed = slave->speed;
3265 old_duplex = slave->duplex;
3266
3267 bond_update_speed_duplex(slave);
3268
3269 if (bond->params.mode == BOND_MODE_8023AD) {
3270 if (old_speed != slave->speed)
3271 bond_3ad_adapter_speed_changed(slave);
3272 if (old_duplex != slave->duplex)
3273 bond_3ad_adapter_duplex_changed(slave);
3274 }
3275 break;
3276 case NETDEV_DOWN:
3277 /*
3278 * ... Or is it this?
3279 */
3280 break;
3281 case NETDEV_CHANGEMTU:
3282 /*
3283 * TODO: Should slaves be allowed to
3284 * independently alter their MTU? For
3285 * an active-backup bond, slaves need
3286 * not be the same type of device, so
3287 * MTUs may vary. For other modes,
3288 * slaves arguably should have the
3289 * same MTUs. To do this, we'd need to
3290 * take over the slave's change_mtu
3291 * function for the duration of their
3292 * servitude.
3293 */
3294 break;
3295 case NETDEV_CHANGENAME:
3296 /*
3297 * TODO: handle changing the primary's name
3298 */
3299 break;
3300 case NETDEV_FEAT_CHANGE:
3301 bond_compute_features(bond);
3302 break;
3303 default:
3304 break;
3305 }
3306
3307 return NOTIFY_DONE;
3308 }
3309
3310 /*
3311 * bond_netdev_event: handle netdev notifier chain events.
3312 *
3313 * This function receives events for the netdev chain. The caller (an
3314 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3315 * locks for us to safely manipulate the slave devices (RTNL lock,
3316 * dev_probe_lock).
3317 */
3318 static int bond_netdev_event(struct notifier_block *this,
3319 unsigned long event, void *ptr)
3320 {
3321 struct net_device *event_dev = (struct net_device *)ptr;
3322
3323 pr_debug("event_dev: %s, event: %lx\n",
3324 event_dev ? event_dev->name : "None",
3325 event);
3326
3327 if (!(event_dev->priv_flags & IFF_BONDING))
3328 return NOTIFY_DONE;
3329
3330 if (event_dev->flags & IFF_MASTER) {
3331 pr_debug("IFF_MASTER\n");
3332 return bond_master_netdev_event(event, event_dev);
3333 }
3334
3335 if (event_dev->flags & IFF_SLAVE) {
3336 pr_debug("IFF_SLAVE\n");
3337 return bond_slave_netdev_event(event, event_dev);
3338 }
3339
3340 return NOTIFY_DONE;
3341 }
3342
3343 static struct notifier_block bond_netdev_notifier = {
3344 .notifier_call = bond_netdev_event,
3345 };
3346
3347 /*---------------------------- Hashing Policies -----------------------------*/
3348
3349 /*
3350 * Hash for the output device based upon layer 2 data
3351 */
3352 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3353 {
3354 struct ethhdr *data = (struct ethhdr *)skb->data;
3355
3356 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3357 return (data->h_dest[5] ^ data->h_source[5]) % count;
3358
3359 return 0;
3360 }
3361
3362 /*
3363 * Hash for the output device based upon layer 2 and layer 3 data. If
3364 * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3365 */
3366 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3367 {
3368 const struct ethhdr *data;
3369 const struct iphdr *iph;
3370 const struct ipv6hdr *ipv6h;
3371 u32 v6hash;
3372 const __be32 *s, *d;
3373
3374 if (skb->protocol == htons(ETH_P_IP) &&
3375 pskb_network_may_pull(skb, sizeof(*iph))) {
3376 iph = ip_hdr(skb);
3377 data = (struct ethhdr *)skb->data;
3378 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3379 (data->h_dest[5] ^ data->h_source[5])) % count;
3380 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3381 pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3382 ipv6h = ipv6_hdr(skb);
3383 data = (struct ethhdr *)skb->data;
3384 s = &ipv6h->saddr.s6_addr32[0];
3385 d = &ipv6h->daddr.s6_addr32[0];
3386 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3387 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3388 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3389 }
3390
3391 return bond_xmit_hash_policy_l2(skb, count);
3392 }
3393
3394 /*
3395 * Hash for the output device based upon layer 3 and layer 4 data. If
3396 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3397 * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3398 */
3399 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3400 {
3401 u32 layer4_xor = 0;
3402 const struct iphdr *iph;
3403 const struct ipv6hdr *ipv6h;
3404 const __be32 *s, *d;
3405 const __be16 *l4 = NULL;
3406 __be16 _l4[2];
3407 int noff = skb_network_offset(skb);
3408 int poff;
3409
3410 if (skb->protocol == htons(ETH_P_IP) &&
3411 pskb_may_pull(skb, noff + sizeof(*iph))) {
3412 iph = ip_hdr(skb);
3413 poff = proto_ports_offset(iph->protocol);
3414
3415 if (!ip_is_fragment(iph) && poff >= 0) {
3416 l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3417 sizeof(_l4), &_l4);
3418 if (l4)
3419 layer4_xor = ntohs(l4[0] ^ l4[1]);
3420 }
3421 return (layer4_xor ^
3422 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3423 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3424 pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3425 ipv6h = ipv6_hdr(skb);
3426 poff = proto_ports_offset(ipv6h->nexthdr);
3427 if (poff >= 0) {
3428 l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3429 sizeof(_l4), &_l4);
3430 if (l4)
3431 layer4_xor = ntohs(l4[0] ^ l4[1]);
3432 }
3433 s = &ipv6h->saddr.s6_addr32[0];
3434 d = &ipv6h->daddr.s6_addr32[0];
3435 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3436 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3437 (layer4_xor >> 8);
3438 return layer4_xor % count;
3439 }
3440
3441 return bond_xmit_hash_policy_l2(skb, count);
3442 }
3443
3444 /*-------------------------- Device entry points ----------------------------*/
3445
3446 static void bond_work_init_all(struct bonding *bond)
3447 {
3448 INIT_DELAYED_WORK(&bond->mcast_work,
3449 bond_resend_igmp_join_requests_delayed);
3450 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3451 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3452 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3453 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3454 else
3455 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3456 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3457 }
3458
3459 static void bond_work_cancel_all(struct bonding *bond)
3460 {
3461 cancel_delayed_work_sync(&bond->mii_work);
3462 cancel_delayed_work_sync(&bond->arp_work);
3463 cancel_delayed_work_sync(&bond->alb_work);
3464 cancel_delayed_work_sync(&bond->ad_work);
3465 cancel_delayed_work_sync(&bond->mcast_work);
3466 }
3467
3468 static int bond_open(struct net_device *bond_dev)
3469 {
3470 struct bonding *bond = netdev_priv(bond_dev);
3471 struct slave *slave;
3472 int i;
3473
3474 /* reset slave->backup and slave->inactive */
3475 read_lock(&bond->lock);
3476 if (bond->slave_cnt > 0) {
3477 read_lock(&bond->curr_slave_lock);
3478 bond_for_each_slave(bond, slave, i) {
3479 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3480 && (slave != bond->curr_active_slave)) {
3481 bond_set_slave_inactive_flags(slave);
3482 } else {
3483 bond_set_slave_active_flags(slave);
3484 }
3485 }
3486 read_unlock(&bond->curr_slave_lock);
3487 }
3488 read_unlock(&bond->lock);
3489
3490 bond_work_init_all(bond);
3491
3492 if (bond_is_lb(bond)) {
3493 /* bond_alb_initialize must be called before the timer
3494 * is started.
3495 */
3496 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3497 return -ENOMEM;
3498 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3499 }
3500
3501 if (bond->params.miimon) /* link check interval, in milliseconds. */
3502 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3503
3504 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3505 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3506 if (bond->params.arp_validate)
3507 bond->recv_probe = bond_arp_rcv;
3508 }
3509
3510 if (bond->params.mode == BOND_MODE_8023AD) {
3511 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3512 /* register to receive LACPDUs */
3513 bond->recv_probe = bond_3ad_lacpdu_recv;
3514 bond_3ad_initiate_agg_selection(bond, 1);
3515 }
3516
3517 return 0;
3518 }
3519
3520 static int bond_close(struct net_device *bond_dev)
3521 {
3522 struct bonding *bond = netdev_priv(bond_dev);
3523
3524 write_lock_bh(&bond->lock);
3525 bond->send_peer_notif = 0;
3526 write_unlock_bh(&bond->lock);
3527
3528 bond_work_cancel_all(bond);
3529 if (bond_is_lb(bond)) {
3530 /* Must be called only after all
3531 * slaves have been released
3532 */
3533 bond_alb_deinitialize(bond);
3534 }
3535 bond->recv_probe = NULL;
3536
3537 return 0;
3538 }
3539
3540 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3541 struct rtnl_link_stats64 *stats)
3542 {
3543 struct bonding *bond = netdev_priv(bond_dev);
3544 struct rtnl_link_stats64 temp;
3545 struct slave *slave;
3546 int i;
3547
3548 memset(stats, 0, sizeof(*stats));
3549
3550 read_lock_bh(&bond->lock);
3551
3552 bond_for_each_slave(bond, slave, i) {
3553 const struct rtnl_link_stats64 *sstats =
3554 dev_get_stats(slave->dev, &temp);
3555
3556 stats->rx_packets += sstats->rx_packets;
3557 stats->rx_bytes += sstats->rx_bytes;
3558 stats->rx_errors += sstats->rx_errors;
3559 stats->rx_dropped += sstats->rx_dropped;
3560
3561 stats->tx_packets += sstats->tx_packets;
3562 stats->tx_bytes += sstats->tx_bytes;
3563 stats->tx_errors += sstats->tx_errors;
3564 stats->tx_dropped += sstats->tx_dropped;
3565
3566 stats->multicast += sstats->multicast;
3567 stats->collisions += sstats->collisions;
3568
3569 stats->rx_length_errors += sstats->rx_length_errors;
3570 stats->rx_over_errors += sstats->rx_over_errors;
3571 stats->rx_crc_errors += sstats->rx_crc_errors;
3572 stats->rx_frame_errors += sstats->rx_frame_errors;
3573 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3574 stats->rx_missed_errors += sstats->rx_missed_errors;
3575
3576 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3577 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3578 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3579 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3580 stats->tx_window_errors += sstats->tx_window_errors;
3581 }
3582
3583 read_unlock_bh(&bond->lock);
3584
3585 return stats;
3586 }
3587
3588 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3589 {
3590 struct net_device *slave_dev = NULL;
3591 struct ifbond k_binfo;
3592 struct ifbond __user *u_binfo = NULL;
3593 struct ifslave k_sinfo;
3594 struct ifslave __user *u_sinfo = NULL;
3595 struct mii_ioctl_data *mii = NULL;
3596 struct net *net;
3597 int res = 0;
3598
3599 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3600
3601 switch (cmd) {
3602 case SIOCGMIIPHY:
3603 mii = if_mii(ifr);
3604 if (!mii)
3605 return -EINVAL;
3606
3607 mii->phy_id = 0;
3608 /* Fall Through */
3609 case SIOCGMIIREG:
3610 /*
3611 * We do this again just in case we were called by SIOCGMIIREG
3612 * instead of SIOCGMIIPHY.
3613 */
3614 mii = if_mii(ifr);
3615 if (!mii)
3616 return -EINVAL;
3617
3618
3619 if (mii->reg_num == 1) {
3620 struct bonding *bond = netdev_priv(bond_dev);
3621 mii->val_out = 0;
3622 read_lock(&bond->lock);
3623 read_lock(&bond->curr_slave_lock);
3624 if (netif_carrier_ok(bond->dev))
3625 mii->val_out = BMSR_LSTATUS;
3626
3627 read_unlock(&bond->curr_slave_lock);
3628 read_unlock(&bond->lock);
3629 }
3630
3631 return 0;
3632 case BOND_INFO_QUERY_OLD:
3633 case SIOCBONDINFOQUERY:
3634 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3635
3636 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3637 return -EFAULT;
3638
3639 res = bond_info_query(bond_dev, &k_binfo);
3640 if (res == 0 &&
3641 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3642 return -EFAULT;
3643
3644 return res;
3645 case BOND_SLAVE_INFO_QUERY_OLD:
3646 case SIOCBONDSLAVEINFOQUERY:
3647 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3648
3649 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3650 return -EFAULT;
3651
3652 res = bond_slave_info_query(bond_dev, &k_sinfo);
3653 if (res == 0 &&
3654 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3655 return -EFAULT;
3656
3657 return res;
3658 default:
3659 /* Go on */
3660 break;
3661 }
3662
3663 net = dev_net(bond_dev);
3664
3665 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3666 return -EPERM;
3667
3668 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3669
3670 pr_debug("slave_dev=%p:\n", slave_dev);
3671
3672 if (!slave_dev)
3673 res = -ENODEV;
3674 else {
3675 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3676 switch (cmd) {
3677 case BOND_ENSLAVE_OLD:
3678 case SIOCBONDENSLAVE:
3679 res = bond_enslave(bond_dev, slave_dev);
3680 break;
3681 case BOND_RELEASE_OLD:
3682 case SIOCBONDRELEASE:
3683 res = bond_release(bond_dev, slave_dev);
3684 break;
3685 case BOND_SETHWADDR_OLD:
3686 case SIOCBONDSETHWADDR:
3687 bond_set_dev_addr(bond_dev, slave_dev);
3688 res = 0;
3689 break;
3690 case BOND_CHANGE_ACTIVE_OLD:
3691 case SIOCBONDCHANGEACTIVE:
3692 res = bond_ioctl_change_active(bond_dev, slave_dev);
3693 break;
3694 default:
3695 res = -EOPNOTSUPP;
3696 }
3697
3698 dev_put(slave_dev);
3699 }
3700
3701 return res;
3702 }
3703
3704 static bool bond_addr_in_mc_list(unsigned char *addr,
3705 struct netdev_hw_addr_list *list,
3706 int addrlen)
3707 {
3708 struct netdev_hw_addr *ha;
3709
3710 netdev_hw_addr_list_for_each(ha, list)
3711 if (!memcmp(ha->addr, addr, addrlen))
3712 return true;
3713
3714 return false;
3715 }
3716
3717 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3718 {
3719 struct bonding *bond = netdev_priv(bond_dev);
3720
3721 if (change & IFF_PROMISC)
3722 bond_set_promiscuity(bond,
3723 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3724
3725 if (change & IFF_ALLMULTI)
3726 bond_set_allmulti(bond,
3727 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3728 }
3729
3730 static void bond_set_multicast_list(struct net_device *bond_dev)
3731 {
3732 struct bonding *bond = netdev_priv(bond_dev);
3733 struct netdev_hw_addr *ha;
3734 bool found;
3735
3736 read_lock(&bond->lock);
3737
3738 /* looking for addresses to add to slaves' mc list */
3739 netdev_for_each_mc_addr(ha, bond_dev) {
3740 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3741 bond_dev->addr_len);
3742 if (!found)
3743 bond_mc_add(bond, ha->addr);
3744 }
3745
3746 /* looking for addresses to delete from slaves' list */
3747 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3748 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3749 bond_dev->addr_len);
3750 if (!found)
3751 bond_mc_del(bond, ha->addr);
3752 }
3753
3754 /* save master's multicast list */
3755 __hw_addr_flush(&bond->mc_list);
3756 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3757 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3758
3759 read_unlock(&bond->lock);
3760 }
3761
3762 static int bond_neigh_init(struct neighbour *n)
3763 {
3764 struct bonding *bond = netdev_priv(n->dev);
3765 struct slave *slave = bond->first_slave;
3766 const struct net_device_ops *slave_ops;
3767 struct neigh_parms parms;
3768 int ret;
3769
3770 if (!slave)
3771 return 0;
3772
3773 slave_ops = slave->dev->netdev_ops;
3774
3775 if (!slave_ops->ndo_neigh_setup)
3776 return 0;
3777
3778 parms.neigh_setup = NULL;
3779 parms.neigh_cleanup = NULL;
3780 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3781 if (ret)
3782 return ret;
3783
3784 /*
3785 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3786 * after the last slave has been detached. Assumes that all slaves
3787 * utilize the same neigh_cleanup (true at this writing as only user
3788 * is ipoib).
3789 */
3790 n->parms->neigh_cleanup = parms.neigh_cleanup;
3791
3792 if (!parms.neigh_setup)
3793 return 0;
3794
3795 return parms.neigh_setup(n);
3796 }
3797
3798 /*
3799 * The bonding ndo_neigh_setup is called at init time beofre any
3800 * slave exists. So we must declare proxy setup function which will
3801 * be used at run time to resolve the actual slave neigh param setup.
3802 *
3803 * It's also called by master devices (such as vlans) to setup their
3804 * underlying devices. In that case - do nothing, we're already set up from
3805 * our init.
3806 */
3807 static int bond_neigh_setup(struct net_device *dev,
3808 struct neigh_parms *parms)
3809 {
3810 /* modify only our neigh_parms */
3811 if (parms->dev == dev)
3812 parms->neigh_setup = bond_neigh_init;
3813
3814 return 0;
3815 }
3816
3817 /*
3818 * Change the MTU of all of a master's slaves to match the master
3819 */
3820 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3821 {
3822 struct bonding *bond = netdev_priv(bond_dev);
3823 struct slave *slave, *stop_at;
3824 int res = 0;
3825 int i;
3826
3827 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3828 (bond_dev ? bond_dev->name : "None"), new_mtu);
3829
3830 /* Can't hold bond->lock with bh disabled here since
3831 * some base drivers panic. On the other hand we can't
3832 * hold bond->lock without bh disabled because we'll
3833 * deadlock. The only solution is to rely on the fact
3834 * that we're under rtnl_lock here, and the slaves
3835 * list won't change. This doesn't solve the problem
3836 * of setting the slave's MTU while it is
3837 * transmitting, but the assumption is that the base
3838 * driver can handle that.
3839 *
3840 * TODO: figure out a way to safely iterate the slaves
3841 * list, but without holding a lock around the actual
3842 * call to the base driver.
3843 */
3844
3845 bond_for_each_slave(bond, slave, i) {
3846 pr_debug("s %p s->p %p c_m %p\n",
3847 slave,
3848 slave->prev,
3849 slave->dev->netdev_ops->ndo_change_mtu);
3850
3851 res = dev_set_mtu(slave->dev, new_mtu);
3852
3853 if (res) {
3854 /* If we failed to set the slave's mtu to the new value
3855 * we must abort the operation even in ACTIVE_BACKUP
3856 * mode, because if we allow the backup slaves to have
3857 * different mtu values than the active slave we'll
3858 * need to change their mtu when doing a failover. That
3859 * means changing their mtu from timer context, which
3860 * is probably not a good idea.
3861 */
3862 pr_debug("err %d %s\n", res, slave->dev->name);
3863 goto unwind;
3864 }
3865 }
3866
3867 bond_dev->mtu = new_mtu;
3868
3869 return 0;
3870
3871 unwind:
3872 /* unwind from head to the slave that failed */
3873 stop_at = slave;
3874 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3875 int tmp_res;
3876
3877 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3878 if (tmp_res) {
3879 pr_debug("unwind err %d dev %s\n",
3880 tmp_res, slave->dev->name);
3881 }
3882 }
3883
3884 return res;
3885 }
3886
3887 /*
3888 * Change HW address
3889 *
3890 * Note that many devices must be down to change the HW address, and
3891 * downing the master releases all slaves. We can make bonds full of
3892 * bonding devices to test this, however.
3893 */
3894 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3895 {
3896 struct bonding *bond = netdev_priv(bond_dev);
3897 struct sockaddr *sa = addr, tmp_sa;
3898 struct slave *slave, *stop_at;
3899 int res = 0;
3900 int i;
3901
3902 if (bond->params.mode == BOND_MODE_ALB)
3903 return bond_alb_set_mac_address(bond_dev, addr);
3904
3905
3906 pr_debug("bond=%p, name=%s\n",
3907 bond, bond_dev ? bond_dev->name : "None");
3908
3909 /*
3910 * If fail_over_mac is set to active, do nothing and return
3911 * success. Returning an error causes ifenslave to fail.
3912 */
3913 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3914 return 0;
3915
3916 if (!is_valid_ether_addr(sa->sa_data))
3917 return -EADDRNOTAVAIL;
3918
3919 /* Can't hold bond->lock with bh disabled here since
3920 * some base drivers panic. On the other hand we can't
3921 * hold bond->lock without bh disabled because we'll
3922 * deadlock. The only solution is to rely on the fact
3923 * that we're under rtnl_lock here, and the slaves
3924 * list won't change. This doesn't solve the problem
3925 * of setting the slave's hw address while it is
3926 * transmitting, but the assumption is that the base
3927 * driver can handle that.
3928 *
3929 * TODO: figure out a way to safely iterate the slaves
3930 * list, but without holding a lock around the actual
3931 * call to the base driver.
3932 */
3933
3934 bond_for_each_slave(bond, slave, i) {
3935 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3936 pr_debug("slave %p %s\n", slave, slave->dev->name);
3937
3938 if (slave_ops->ndo_set_mac_address == NULL) {
3939 res = -EOPNOTSUPP;
3940 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3941 goto unwind;
3942 }
3943
3944 res = dev_set_mac_address(slave->dev, addr);
3945 if (res) {
3946 /* TODO: consider downing the slave
3947 * and retry ?
3948 * User should expect communications
3949 * breakage anyway until ARP finish
3950 * updating, so...
3951 */
3952 pr_debug("err %d %s\n", res, slave->dev->name);
3953 goto unwind;
3954 }
3955 }
3956
3957 /* success */
3958 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3959 return 0;
3960
3961 unwind:
3962 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3963 tmp_sa.sa_family = bond_dev->type;
3964
3965 /* unwind from head to the slave that failed */
3966 stop_at = slave;
3967 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3968 int tmp_res;
3969
3970 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3971 if (tmp_res) {
3972 pr_debug("unwind err %d dev %s\n",
3973 tmp_res, slave->dev->name);
3974 }
3975 }
3976
3977 return res;
3978 }
3979
3980 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3981 {
3982 struct bonding *bond = netdev_priv(bond_dev);
3983 struct slave *slave, *start_at;
3984 int i, slave_no, res = 1;
3985 struct iphdr *iph = ip_hdr(skb);
3986
3987 /*
3988 * Start with the curr_active_slave that joined the bond as the
3989 * default for sending IGMP traffic. For failover purposes one
3990 * needs to maintain some consistency for the interface that will
3991 * send the join/membership reports. The curr_active_slave found
3992 * will send all of this type of traffic.
3993 */
3994 if ((iph->protocol == IPPROTO_IGMP) &&
3995 (skb->protocol == htons(ETH_P_IP))) {
3996
3997 read_lock(&bond->curr_slave_lock);
3998 slave = bond->curr_active_slave;
3999 read_unlock(&bond->curr_slave_lock);
4000
4001 if (!slave)
4002 goto out;
4003 } else {
4004 /*
4005 * Concurrent TX may collide on rr_tx_counter; we accept
4006 * that as being rare enough not to justify using an
4007 * atomic op here.
4008 */
4009 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
4010
4011 bond_for_each_slave(bond, slave, i) {
4012 slave_no--;
4013 if (slave_no < 0)
4014 break;
4015 }
4016 }
4017
4018 start_at = slave;
4019 bond_for_each_slave_from(bond, slave, i, start_at) {
4020 if (IS_UP(slave->dev) &&
4021 (slave->link == BOND_LINK_UP) &&
4022 bond_is_active_slave(slave)) {
4023 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4024 break;
4025 }
4026 }
4027
4028 out:
4029 if (res) {
4030 /* no suitable interface, frame not sent */
4031 kfree_skb(skb);
4032 }
4033
4034 return NETDEV_TX_OK;
4035 }
4036
4037
4038 /*
4039 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4040 * the bond has a usable interface.
4041 */
4042 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4043 {
4044 struct bonding *bond = netdev_priv(bond_dev);
4045 int res = 1;
4046
4047 read_lock(&bond->curr_slave_lock);
4048
4049 if (bond->curr_active_slave)
4050 res = bond_dev_queue_xmit(bond, skb,
4051 bond->curr_active_slave->dev);
4052
4053 read_unlock(&bond->curr_slave_lock);
4054
4055 if (res)
4056 /* no suitable interface, frame not sent */
4057 kfree_skb(skb);
4058
4059 return NETDEV_TX_OK;
4060 }
4061
4062 /*
4063 * In bond_xmit_xor() , we determine the output device by using a pre-
4064 * determined xmit_hash_policy(), If the selected device is not enabled,
4065 * find the next active slave.
4066 */
4067 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4068 {
4069 struct bonding *bond = netdev_priv(bond_dev);
4070 struct slave *slave, *start_at;
4071 int slave_no;
4072 int i;
4073 int res = 1;
4074
4075 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4076
4077 bond_for_each_slave(bond, slave, i) {
4078 slave_no--;
4079 if (slave_no < 0)
4080 break;
4081 }
4082
4083 start_at = slave;
4084
4085 bond_for_each_slave_from(bond, slave, i, start_at) {
4086 if (IS_UP(slave->dev) &&
4087 (slave->link == BOND_LINK_UP) &&
4088 bond_is_active_slave(slave)) {
4089 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4090 break;
4091 }
4092 }
4093
4094 if (res) {
4095 /* no suitable interface, frame not sent */
4096 kfree_skb(skb);
4097 }
4098
4099 return NETDEV_TX_OK;
4100 }
4101
4102 /*
4103 * in broadcast mode, we send everything to all usable interfaces.
4104 */
4105 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4106 {
4107 struct bonding *bond = netdev_priv(bond_dev);
4108 struct slave *slave, *start_at;
4109 struct net_device *tx_dev = NULL;
4110 int i;
4111 int res = 1;
4112
4113 read_lock(&bond->curr_slave_lock);
4114 start_at = bond->curr_active_slave;
4115 read_unlock(&bond->curr_slave_lock);
4116
4117 if (!start_at)
4118 goto out;
4119
4120 bond_for_each_slave_from(bond, slave, i, start_at) {
4121 if (IS_UP(slave->dev) &&
4122 (slave->link == BOND_LINK_UP) &&
4123 bond_is_active_slave(slave)) {
4124 if (tx_dev) {
4125 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4126 if (!skb2) {
4127 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4128 bond_dev->name);
4129 continue;
4130 }
4131
4132 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4133 if (res) {
4134 kfree_skb(skb2);
4135 continue;
4136 }
4137 }
4138 tx_dev = slave->dev;
4139 }
4140 }
4141
4142 if (tx_dev)
4143 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4144
4145 out:
4146 if (res)
4147 /* no suitable interface, frame not sent */
4148 kfree_skb(skb);
4149
4150 /* frame sent to all suitable interfaces */
4151 return NETDEV_TX_OK;
4152 }
4153
4154 /*------------------------- Device initialization ---------------------------*/
4155
4156 static void bond_set_xmit_hash_policy(struct bonding *bond)
4157 {
4158 switch (bond->params.xmit_policy) {
4159 case BOND_XMIT_POLICY_LAYER23:
4160 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4161 break;
4162 case BOND_XMIT_POLICY_LAYER34:
4163 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4164 break;
4165 case BOND_XMIT_POLICY_LAYER2:
4166 default:
4167 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4168 break;
4169 }
4170 }
4171
4172 /*
4173 * Lookup the slave that corresponds to a qid
4174 */
4175 static inline int bond_slave_override(struct bonding *bond,
4176 struct sk_buff *skb)
4177 {
4178 int i, res = 1;
4179 struct slave *slave = NULL;
4180 struct slave *check_slave;
4181
4182 if (!skb->queue_mapping)
4183 return 1;
4184
4185 /* Find out if any slaves have the same mapping as this skb. */
4186 bond_for_each_slave(bond, check_slave, i) {
4187 if (check_slave->queue_id == skb->queue_mapping) {
4188 slave = check_slave;
4189 break;
4190 }
4191 }
4192
4193 /* If the slave isn't UP, use default transmit policy. */
4194 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4195 (slave->link == BOND_LINK_UP)) {
4196 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4197 }
4198
4199 return res;
4200 }
4201
4202
4203 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4204 {
4205 /*
4206 * This helper function exists to help dev_pick_tx get the correct
4207 * destination queue. Using a helper function skips a call to
4208 * skb_tx_hash and will put the skbs in the queue we expect on their
4209 * way down to the bonding driver.
4210 */
4211 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4212
4213 /*
4214 * Save the original txq to restore before passing to the driver
4215 */
4216 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4217
4218 if (unlikely(txq >= dev->real_num_tx_queues)) {
4219 do {
4220 txq -= dev->real_num_tx_queues;
4221 } while (txq >= dev->real_num_tx_queues);
4222 }
4223 return txq;
4224 }
4225
4226 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4227 {
4228 struct bonding *bond = netdev_priv(dev);
4229
4230 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4231 if (!bond_slave_override(bond, skb))
4232 return NETDEV_TX_OK;
4233 }
4234
4235 switch (bond->params.mode) {
4236 case BOND_MODE_ROUNDROBIN:
4237 return bond_xmit_roundrobin(skb, dev);
4238 case BOND_MODE_ACTIVEBACKUP:
4239 return bond_xmit_activebackup(skb, dev);
4240 case BOND_MODE_XOR:
4241 return bond_xmit_xor(skb, dev);
4242 case BOND_MODE_BROADCAST:
4243 return bond_xmit_broadcast(skb, dev);
4244 case BOND_MODE_8023AD:
4245 return bond_3ad_xmit_xor(skb, dev);
4246 case BOND_MODE_ALB:
4247 case BOND_MODE_TLB:
4248 return bond_alb_xmit(skb, dev);
4249 default:
4250 /* Should never happen, mode already checked */
4251 pr_err("%s: Error: Unknown bonding mode %d\n",
4252 dev->name, bond->params.mode);
4253 WARN_ON_ONCE(1);
4254 kfree_skb(skb);
4255 return NETDEV_TX_OK;
4256 }
4257 }
4258
4259 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4260 {
4261 struct bonding *bond = netdev_priv(dev);
4262 netdev_tx_t ret = NETDEV_TX_OK;
4263
4264 /*
4265 * If we risk deadlock from transmitting this in the
4266 * netpoll path, tell netpoll to queue the frame for later tx
4267 */
4268 if (is_netpoll_tx_blocked(dev))
4269 return NETDEV_TX_BUSY;
4270
4271 read_lock(&bond->lock);
4272
4273 if (bond->slave_cnt)
4274 ret = __bond_start_xmit(skb, dev);
4275 else
4276 kfree_skb(skb);
4277
4278 read_unlock(&bond->lock);
4279
4280 return ret;
4281 }
4282
4283 /*
4284 * set bond mode specific net device operations
4285 */
4286 void bond_set_mode_ops(struct bonding *bond, int mode)
4287 {
4288 struct net_device *bond_dev = bond->dev;
4289
4290 switch (mode) {
4291 case BOND_MODE_ROUNDROBIN:
4292 break;
4293 case BOND_MODE_ACTIVEBACKUP:
4294 break;
4295 case BOND_MODE_XOR:
4296 bond_set_xmit_hash_policy(bond);
4297 break;
4298 case BOND_MODE_BROADCAST:
4299 break;
4300 case BOND_MODE_8023AD:
4301 bond_set_xmit_hash_policy(bond);
4302 break;
4303 case BOND_MODE_ALB:
4304 /* FALLTHRU */
4305 case BOND_MODE_TLB:
4306 break;
4307 default:
4308 /* Should never happen, mode already checked */
4309 pr_err("%s: Error: Unknown bonding mode %d\n",
4310 bond_dev->name, mode);
4311 break;
4312 }
4313 }
4314
4315 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4316 struct ethtool_cmd *ecmd)
4317 {
4318 struct bonding *bond = netdev_priv(bond_dev);
4319 struct slave *slave;
4320 int i;
4321 unsigned long speed = 0;
4322
4323 ecmd->duplex = DUPLEX_UNKNOWN;
4324 ecmd->port = PORT_OTHER;
4325
4326 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
4327 * do not need to check mode. Though link speed might not represent
4328 * the true receive or transmit bandwidth (not all modes are symmetric)
4329 * this is an accurate maximum.
4330 */
4331 read_lock(&bond->lock);
4332 bond_for_each_slave(bond, slave, i) {
4333 if (SLAVE_IS_OK(slave)) {
4334 if (slave->speed != SPEED_UNKNOWN)
4335 speed += slave->speed;
4336 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4337 slave->duplex != DUPLEX_UNKNOWN)
4338 ecmd->duplex = slave->duplex;
4339 }
4340 }
4341 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4342 read_unlock(&bond->lock);
4343 return 0;
4344 }
4345
4346 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4347 struct ethtool_drvinfo *drvinfo)
4348 {
4349 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4350 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4351 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4352 BOND_ABI_VERSION);
4353 }
4354
4355 static const struct ethtool_ops bond_ethtool_ops = {
4356 .get_drvinfo = bond_ethtool_get_drvinfo,
4357 .get_settings = bond_ethtool_get_settings,
4358 .get_link = ethtool_op_get_link,
4359 };
4360
4361 static const struct net_device_ops bond_netdev_ops = {
4362 .ndo_init = bond_init,
4363 .ndo_uninit = bond_uninit,
4364 .ndo_open = bond_open,
4365 .ndo_stop = bond_close,
4366 .ndo_start_xmit = bond_start_xmit,
4367 .ndo_select_queue = bond_select_queue,
4368 .ndo_get_stats64 = bond_get_stats,
4369 .ndo_do_ioctl = bond_do_ioctl,
4370 .ndo_change_rx_flags = bond_change_rx_flags,
4371 .ndo_set_rx_mode = bond_set_multicast_list,
4372 .ndo_change_mtu = bond_change_mtu,
4373 .ndo_set_mac_address = bond_set_mac_address,
4374 .ndo_neigh_setup = bond_neigh_setup,
4375 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4376 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4377 #ifdef CONFIG_NET_POLL_CONTROLLER
4378 .ndo_netpoll_setup = bond_netpoll_setup,
4379 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4380 .ndo_poll_controller = bond_poll_controller,
4381 #endif
4382 .ndo_add_slave = bond_enslave,
4383 .ndo_del_slave = bond_release,
4384 .ndo_fix_features = bond_fix_features,
4385 };
4386
4387 static const struct device_type bond_type = {
4388 .name = "bond",
4389 };
4390
4391 static void bond_destructor(struct net_device *bond_dev)
4392 {
4393 struct bonding *bond = netdev_priv(bond_dev);
4394 if (bond->wq)
4395 destroy_workqueue(bond->wq);
4396 free_netdev(bond_dev);
4397 }
4398
4399 static void bond_setup(struct net_device *bond_dev)
4400 {
4401 struct bonding *bond = netdev_priv(bond_dev);
4402
4403 /* initialize rwlocks */
4404 rwlock_init(&bond->lock);
4405 rwlock_init(&bond->curr_slave_lock);
4406
4407 bond->params = bonding_defaults;
4408
4409 /* Initialize pointers */
4410 bond->dev = bond_dev;
4411 INIT_LIST_HEAD(&bond->vlan_list);
4412
4413 /* Initialize the device entry points */
4414 ether_setup(bond_dev);
4415 bond_dev->netdev_ops = &bond_netdev_ops;
4416 bond_dev->ethtool_ops = &bond_ethtool_ops;
4417 bond_set_mode_ops(bond, bond->params.mode);
4418
4419 bond_dev->destructor = bond_destructor;
4420
4421 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4422
4423 /* Initialize the device options */
4424 bond_dev->tx_queue_len = 0;
4425 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4426 bond_dev->priv_flags |= IFF_BONDING;
4427 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4428
4429 /* At first, we block adding VLANs. That's the only way to
4430 * prevent problems that occur when adding VLANs over an
4431 * empty bond. The block will be removed once non-challenged
4432 * slaves are enslaved.
4433 */
4434 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4435
4436 /* don't acquire bond device's netif_tx_lock when
4437 * transmitting */
4438 bond_dev->features |= NETIF_F_LLTX;
4439
4440 /* By default, we declare the bond to be fully
4441 * VLAN hardware accelerated capable. Special
4442 * care is taken in the various xmit functions
4443 * when there are slaves that are not hw accel
4444 * capable
4445 */
4446
4447 bond_dev->hw_features = BOND_VLAN_FEATURES |
4448 NETIF_F_HW_VLAN_CTAG_TX |
4449 NETIF_F_HW_VLAN_CTAG_RX |
4450 NETIF_F_HW_VLAN_CTAG_FILTER;
4451
4452 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4453 bond_dev->features |= bond_dev->hw_features;
4454 }
4455
4456 /*
4457 * Destroy a bonding device.
4458 * Must be under rtnl_lock when this function is called.
4459 */
4460 static void bond_uninit(struct net_device *bond_dev)
4461 {
4462 struct bonding *bond = netdev_priv(bond_dev);
4463 struct vlan_entry *vlan, *tmp;
4464
4465 bond_netpoll_cleanup(bond_dev);
4466
4467 /* Release the bonded slaves */
4468 while (bond->first_slave != NULL)
4469 __bond_release_one(bond_dev, bond->first_slave->dev, true);
4470 pr_info("%s: released all slaves\n", bond_dev->name);
4471
4472 list_del(&bond->bond_list);
4473
4474 bond_debug_unregister(bond);
4475
4476 __hw_addr_flush(&bond->mc_list);
4477
4478 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4479 list_del(&vlan->vlan_list);
4480 kfree(vlan);
4481 }
4482 }
4483
4484 /*------------------------- Module initialization ---------------------------*/
4485
4486 /*
4487 * Convert string input module parms. Accept either the
4488 * number of the mode or its string name. A bit complicated because
4489 * some mode names are substrings of other names, and calls from sysfs
4490 * may have whitespace in the name (trailing newlines, for example).
4491 */
4492 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4493 {
4494 int modeint = -1, i, rv;
4495 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4496
4497 for (p = (char *)buf; *p; p++)
4498 if (!(isdigit(*p) || isspace(*p)))
4499 break;
4500
4501 if (*p)
4502 rv = sscanf(buf, "%20s", modestr);
4503 else
4504 rv = sscanf(buf, "%d", &modeint);
4505
4506 if (!rv)
4507 return -1;
4508
4509 for (i = 0; tbl[i].modename; i++) {
4510 if (modeint == tbl[i].mode)
4511 return tbl[i].mode;
4512 if (strcmp(modestr, tbl[i].modename) == 0)
4513 return tbl[i].mode;
4514 }
4515
4516 return -1;
4517 }
4518
4519 static int bond_check_params(struct bond_params *params)
4520 {
4521 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4522
4523 /*
4524 * Convert string parameters.
4525 */
4526 if (mode) {
4527 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4528 if (bond_mode == -1) {
4529 pr_err("Error: Invalid bonding mode \"%s\"\n",
4530 mode == NULL ? "NULL" : mode);
4531 return -EINVAL;
4532 }
4533 }
4534
4535 if (xmit_hash_policy) {
4536 if ((bond_mode != BOND_MODE_XOR) &&
4537 (bond_mode != BOND_MODE_8023AD)) {
4538 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4539 bond_mode_name(bond_mode));
4540 } else {
4541 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4542 xmit_hashtype_tbl);
4543 if (xmit_hashtype == -1) {
4544 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4545 xmit_hash_policy == NULL ? "NULL" :
4546 xmit_hash_policy);
4547 return -EINVAL;
4548 }
4549 }
4550 }
4551
4552 if (lacp_rate) {
4553 if (bond_mode != BOND_MODE_8023AD) {
4554 pr_info("lacp_rate param is irrelevant in mode %s\n",
4555 bond_mode_name(bond_mode));
4556 } else {
4557 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4558 if (lacp_fast == -1) {
4559 pr_err("Error: Invalid lacp rate \"%s\"\n",
4560 lacp_rate == NULL ? "NULL" : lacp_rate);
4561 return -EINVAL;
4562 }
4563 }
4564 }
4565
4566 if (ad_select) {
4567 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4568 if (params->ad_select == -1) {
4569 pr_err("Error: Invalid ad_select \"%s\"\n",
4570 ad_select == NULL ? "NULL" : ad_select);
4571 return -EINVAL;
4572 }
4573
4574 if (bond_mode != BOND_MODE_8023AD) {
4575 pr_warning("ad_select param only affects 802.3ad mode\n");
4576 }
4577 } else {
4578 params->ad_select = BOND_AD_STABLE;
4579 }
4580
4581 if (max_bonds < 0) {
4582 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4583 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4584 max_bonds = BOND_DEFAULT_MAX_BONDS;
4585 }
4586
4587 if (miimon < 0) {
4588 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4589 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4590 miimon = BOND_LINK_MON_INTERV;
4591 }
4592
4593 if (updelay < 0) {
4594 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4595 updelay, INT_MAX);
4596 updelay = 0;
4597 }
4598
4599 if (downdelay < 0) {
4600 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4601 downdelay, INT_MAX);
4602 downdelay = 0;
4603 }
4604
4605 if ((use_carrier != 0) && (use_carrier != 1)) {
4606 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4607 use_carrier);
4608 use_carrier = 1;
4609 }
4610
4611 if (num_peer_notif < 0 || num_peer_notif > 255) {
4612 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4613 num_peer_notif);
4614 num_peer_notif = 1;
4615 }
4616
4617 /* reset values for 802.3ad */
4618 if (bond_mode == BOND_MODE_8023AD) {
4619 if (!miimon) {
4620 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");
4621 pr_warning("Forcing miimon to 100msec\n");
4622 miimon = 100;
4623 }
4624 }
4625
4626 if (tx_queues < 1 || tx_queues > 255) {
4627 pr_warning("Warning: tx_queues (%d) should be between "
4628 "1 and 255, resetting to %d\n",
4629 tx_queues, BOND_DEFAULT_TX_QUEUES);
4630 tx_queues = BOND_DEFAULT_TX_QUEUES;
4631 }
4632
4633 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4634 pr_warning("Warning: all_slaves_active module parameter (%d), "
4635 "not of valid value (0/1), so it was set to "
4636 "0\n", all_slaves_active);
4637 all_slaves_active = 0;
4638 }
4639
4640 if (resend_igmp < 0 || resend_igmp > 255) {
4641 pr_warning("Warning: resend_igmp (%d) should be between "
4642 "0 and 255, resetting to %d\n",
4643 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4644 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4645 }
4646
4647 /* reset values for TLB/ALB */
4648 if ((bond_mode == BOND_MODE_TLB) ||
4649 (bond_mode == BOND_MODE_ALB)) {
4650 if (!miimon) {
4651 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");
4652 pr_warning("Forcing miimon to 100msec\n");
4653 miimon = 100;
4654 }
4655 }
4656
4657 if (bond_mode == BOND_MODE_ALB) {
4658 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",
4659 updelay);
4660 }
4661
4662 if (!miimon) {
4663 if (updelay || downdelay) {
4664 /* just warn the user the up/down delay will have
4665 * no effect since miimon is zero...
4666 */
4667 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",
4668 updelay, downdelay);
4669 }
4670 } else {
4671 /* don't allow arp monitoring */
4672 if (arp_interval) {
4673 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4674 miimon, arp_interval);
4675 arp_interval = 0;
4676 }
4677
4678 if ((updelay % miimon) != 0) {
4679 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4680 updelay, miimon,
4681 (updelay / miimon) * miimon);
4682 }
4683
4684 updelay /= miimon;
4685
4686 if ((downdelay % miimon) != 0) {
4687 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4688 downdelay, miimon,
4689 (downdelay / miimon) * miimon);
4690 }
4691
4692 downdelay /= miimon;
4693 }
4694
4695 if (arp_interval < 0) {
4696 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4697 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4698 arp_interval = BOND_LINK_ARP_INTERV;
4699 }
4700
4701 for (arp_ip_count = 0, i = 0;
4702 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4703 /* not complete check, but should be good enough to
4704 catch mistakes */
4705 __be32 ip = in_aton(arp_ip_target[i]);
4706 if (!isdigit(arp_ip_target[i][0]) || ip == 0 ||
4707 ip == htonl(INADDR_BROADCAST)) {
4708 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4709 arp_ip_target[i]);
4710 arp_interval = 0;
4711 } else {
4712 arp_target[arp_ip_count++] = ip;
4713 }
4714 }
4715
4716 if (arp_interval && !arp_ip_count) {
4717 /* don't allow arping if no arp_ip_target given... */
4718 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4719 arp_interval);
4720 arp_interval = 0;
4721 }
4722
4723 if (arp_validate) {
4724 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4725 pr_err("arp_validate only supported in active-backup mode\n");
4726 return -EINVAL;
4727 }
4728 if (!arp_interval) {
4729 pr_err("arp_validate requires arp_interval\n");
4730 return -EINVAL;
4731 }
4732
4733 arp_validate_value = bond_parse_parm(arp_validate,
4734 arp_validate_tbl);
4735 if (arp_validate_value == -1) {
4736 pr_err("Error: invalid arp_validate \"%s\"\n",
4737 arp_validate == NULL ? "NULL" : arp_validate);
4738 return -EINVAL;
4739 }
4740 } else
4741 arp_validate_value = 0;
4742
4743 if (miimon) {
4744 pr_info("MII link monitoring set to %d ms\n", miimon);
4745 } else if (arp_interval) {
4746 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4747 arp_interval,
4748 arp_validate_tbl[arp_validate_value].modename,
4749 arp_ip_count);
4750
4751 for (i = 0; i < arp_ip_count; i++)
4752 pr_info(" %s", arp_ip_target[i]);
4753
4754 pr_info("\n");
4755
4756 } else if (max_bonds) {
4757 /* miimon and arp_interval not set, we need one so things
4758 * work as expected, see bonding.txt for details
4759 */
4760 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");
4761 }
4762
4763 if (primary && !USES_PRIMARY(bond_mode)) {
4764 /* currently, using a primary only makes sense
4765 * in active backup, TLB or ALB modes
4766 */
4767 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4768 primary, bond_mode_name(bond_mode));
4769 primary = NULL;
4770 }
4771
4772 if (primary && primary_reselect) {
4773 primary_reselect_value = bond_parse_parm(primary_reselect,
4774 pri_reselect_tbl);
4775 if (primary_reselect_value == -1) {
4776 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4777 primary_reselect ==
4778 NULL ? "NULL" : primary_reselect);
4779 return -EINVAL;
4780 }
4781 } else {
4782 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4783 }
4784
4785 if (fail_over_mac) {
4786 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4787 fail_over_mac_tbl);
4788 if (fail_over_mac_value == -1) {
4789 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4790 arp_validate == NULL ? "NULL" : arp_validate);
4791 return -EINVAL;
4792 }
4793
4794 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4795 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4796 } else {
4797 fail_over_mac_value = BOND_FOM_NONE;
4798 }
4799
4800 /* fill params struct with the proper values */
4801 params->mode = bond_mode;
4802 params->xmit_policy = xmit_hashtype;
4803 params->miimon = miimon;
4804 params->num_peer_notif = num_peer_notif;
4805 params->arp_interval = arp_interval;
4806 params->arp_validate = arp_validate_value;
4807 params->updelay = updelay;
4808 params->downdelay = downdelay;
4809 params->use_carrier = use_carrier;
4810 params->lacp_fast = lacp_fast;
4811 params->primary[0] = 0;
4812 params->primary_reselect = primary_reselect_value;
4813 params->fail_over_mac = fail_over_mac_value;
4814 params->tx_queues = tx_queues;
4815 params->all_slaves_active = all_slaves_active;
4816 params->resend_igmp = resend_igmp;
4817 params->min_links = min_links;
4818
4819 if (primary) {
4820 strncpy(params->primary, primary, IFNAMSIZ);
4821 params->primary[IFNAMSIZ - 1] = 0;
4822 }
4823
4824 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4825
4826 return 0;
4827 }
4828
4829 static struct lock_class_key bonding_netdev_xmit_lock_key;
4830 static struct lock_class_key bonding_netdev_addr_lock_key;
4831 static struct lock_class_key bonding_tx_busylock_key;
4832
4833 static void bond_set_lockdep_class_one(struct net_device *dev,
4834 struct netdev_queue *txq,
4835 void *_unused)
4836 {
4837 lockdep_set_class(&txq->_xmit_lock,
4838 &bonding_netdev_xmit_lock_key);
4839 }
4840
4841 static void bond_set_lockdep_class(struct net_device *dev)
4842 {
4843 lockdep_set_class(&dev->addr_list_lock,
4844 &bonding_netdev_addr_lock_key);
4845 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4846 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4847 }
4848
4849 /*
4850 * Called from registration process
4851 */
4852 static int bond_init(struct net_device *bond_dev)
4853 {
4854 struct bonding *bond = netdev_priv(bond_dev);
4855 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4856 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4857
4858 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4859
4860 /*
4861 * Initialize locks that may be required during
4862 * en/deslave operations. All of the bond_open work
4863 * (of which this is part) should really be moved to
4864 * a phase prior to dev_open
4865 */
4866 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4867 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4868
4869 bond->wq = create_singlethread_workqueue(bond_dev->name);
4870 if (!bond->wq)
4871 return -ENOMEM;
4872
4873 bond_set_lockdep_class(bond_dev);
4874
4875 list_add_tail(&bond->bond_list, &bn->dev_list);
4876
4877 bond_prepare_sysfs_group(bond);
4878
4879 bond_debug_register(bond);
4880
4881 /* Ensure valid dev_addr */
4882 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4883 bond_dev->addr_assign_type == NET_ADDR_PERM) {
4884 eth_hw_addr_random(bond_dev);
4885 bond->dev_addr_from_first = true;
4886 }
4887
4888 __hw_addr_init(&bond->mc_list);
4889 return 0;
4890 }
4891
4892 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4893 {
4894 if (tb[IFLA_ADDRESS]) {
4895 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4896 return -EINVAL;
4897 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4898 return -EADDRNOTAVAIL;
4899 }
4900 return 0;
4901 }
4902
4903 static unsigned int bond_get_num_tx_queues(void)
4904 {
4905 return tx_queues;
4906 }
4907
4908 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4909 .kind = "bond",
4910 .priv_size = sizeof(struct bonding),
4911 .setup = bond_setup,
4912 .validate = bond_validate,
4913 .get_num_tx_queues = bond_get_num_tx_queues,
4914 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4915 as for TX queues */
4916 };
4917
4918 /* Create a new bond based on the specified name and bonding parameters.
4919 * If name is NULL, obtain a suitable "bond%d" name for us.
4920 * Caller must NOT hold rtnl_lock; we need to release it here before we
4921 * set up our sysfs entries.
4922 */
4923 int bond_create(struct net *net, const char *name)
4924 {
4925 struct net_device *bond_dev;
4926 int res;
4927
4928 rtnl_lock();
4929
4930 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4931 name ? name : "bond%d",
4932 bond_setup, tx_queues);
4933 if (!bond_dev) {
4934 pr_err("%s: eek! can't alloc netdev!\n", name);
4935 rtnl_unlock();
4936 return -ENOMEM;
4937 }
4938
4939 dev_net_set(bond_dev, net);
4940 bond_dev->rtnl_link_ops = &bond_link_ops;
4941
4942 res = register_netdevice(bond_dev);
4943
4944 netif_carrier_off(bond_dev);
4945
4946 rtnl_unlock();
4947 if (res < 0)
4948 bond_destructor(bond_dev);
4949 return res;
4950 }
4951
4952 static int __net_init bond_net_init(struct net *net)
4953 {
4954 struct bond_net *bn = net_generic(net, bond_net_id);
4955
4956 bn->net = net;
4957 INIT_LIST_HEAD(&bn->dev_list);
4958
4959 bond_create_proc_dir(bn);
4960 bond_create_sysfs(bn);
4961
4962 return 0;
4963 }
4964
4965 static void __net_exit bond_net_exit(struct net *net)
4966 {
4967 struct bond_net *bn = net_generic(net, bond_net_id);
4968 struct bonding *bond, *tmp_bond;
4969 LIST_HEAD(list);
4970
4971 bond_destroy_sysfs(bn);
4972 bond_destroy_proc_dir(bn);
4973
4974 /* Kill off any bonds created after unregistering bond rtnl ops */
4975 rtnl_lock();
4976 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4977 unregister_netdevice_queue(bond->dev, &list);
4978 unregister_netdevice_many(&list);
4979 rtnl_unlock();
4980 }
4981
4982 static struct pernet_operations bond_net_ops = {
4983 .init = bond_net_init,
4984 .exit = bond_net_exit,
4985 .id = &bond_net_id,
4986 .size = sizeof(struct bond_net),
4987 };
4988
4989 static int __init bonding_init(void)
4990 {
4991 int i;
4992 int res;
4993
4994 pr_info("%s", bond_version);
4995
4996 res = bond_check_params(&bonding_defaults);
4997 if (res)
4998 goto out;
4999
5000 res = register_pernet_subsys(&bond_net_ops);
5001 if (res)
5002 goto out;
5003
5004 res = rtnl_link_register(&bond_link_ops);
5005 if (res)
5006 goto err_link;
5007
5008 bond_create_debugfs();
5009
5010 for (i = 0; i < max_bonds; i++) {
5011 res = bond_create(&init_net, NULL);
5012 if (res)
5013 goto err;
5014 }
5015
5016 register_netdevice_notifier(&bond_netdev_notifier);
5017 out:
5018 return res;
5019 err:
5020 bond_destroy_debugfs();
5021 rtnl_link_unregister(&bond_link_ops);
5022 err_link:
5023 unregister_pernet_subsys(&bond_net_ops);
5024 goto out;
5025
5026 }
5027
5028 static void __exit bonding_exit(void)
5029 {
5030 unregister_netdevice_notifier(&bond_netdev_notifier);
5031
5032 bond_destroy_debugfs();
5033
5034 rtnl_link_unregister(&bond_link_ops);
5035 unregister_pernet_subsys(&bond_net_ops);
5036
5037 #ifdef CONFIG_NET_POLL_CONTROLLER
5038 /*
5039 * Make sure we don't have an imbalance on our netpoll blocking
5040 */
5041 WARN_ON(atomic_read(&netpoll_block_tx));
5042 #endif
5043 }
5044
5045 module_init(bonding_init);
5046 module_exit(bonding_exit);
5047 MODULE_LICENSE("GPL");
5048 MODULE_VERSION(DRV_VERSION);
5049 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5050 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5051 MODULE_ALIAS_RTNL_LINK("bond");
kernel source for telekom puls (alcatel/mediatek)