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xenbus_client.c: correct exit path for xenbus_map_ring_valloc_hvm
[linux/fpc-iii.git] / drivers / net / bonding / bond_main.c
blobd0aade04e49aff739294de120d44defaba46fbf2
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 rcu_read_lock();
768 read_lock(&bond->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
791 if (--bond->igmp_retrans > 0)
792 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
793
794 read_unlock(&bond->lock);
795 rcu_read_unlock();
796 }
797
798 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
799 {
800 struct bonding *bond = container_of(work, struct bonding,
801 mcast_work.work);
802
803 bond_resend_igmp_join_requests(bond);
804 }
805
806 /*
807 * flush all members of flush->mc_list from device dev->mc_list
808 */
809 static void bond_mc_list_flush(struct net_device *bond_dev,
810 struct net_device *slave_dev)
811 {
812 struct bonding *bond = netdev_priv(bond_dev);
813 struct netdev_hw_addr *ha;
814
815 netdev_for_each_mc_addr(ha, bond_dev)
816 dev_mc_del(slave_dev, ha->addr);
817
818 if (bond->params.mode == BOND_MODE_8023AD) {
819 /* del lacpdu mc addr from mc list */
820 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
821
822 dev_mc_del(slave_dev, lacpdu_multicast);
823 }
824 }
825
826 /*--------------------------- Active slave change ---------------------------*/
827
828 /*
829 * Update the mc list and multicast-related flags for the new and
830 * old active slaves (if any) according to the multicast mode, and
831 * promiscuous flags unconditionally.
832 */
833 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
834 struct slave *old_active)
835 {
836 struct netdev_hw_addr *ha;
837
838 if (!USES_PRIMARY(bond->params.mode))
839 /* nothing to do - mc list is already up-to-date on
840 * all slaves
841 */
842 return;
843
844 if (old_active) {
845 if (bond->dev->flags & IFF_PROMISC)
846 dev_set_promiscuity(old_active->dev, -1);
847
848 if (bond->dev->flags & IFF_ALLMULTI)
849 dev_set_allmulti(old_active->dev, -1);
850
851 netif_addr_lock_bh(bond->dev);
852 netdev_for_each_mc_addr(ha, bond->dev)
853 dev_mc_del(old_active->dev, ha->addr);
854 netif_addr_unlock_bh(bond->dev);
855 }
856
857 if (new_active) {
858 /* FIXME: Signal errors upstream. */
859 if (bond->dev->flags & IFF_PROMISC)
860 dev_set_promiscuity(new_active->dev, 1);
861
862 if (bond->dev->flags & IFF_ALLMULTI)
863 dev_set_allmulti(new_active->dev, 1);
864
865 netif_addr_lock_bh(bond->dev);
866 netdev_for_each_mc_addr(ha, bond->dev)
867 dev_mc_add(new_active->dev, ha->addr);
868 netif_addr_unlock_bh(bond->dev);
869 }
870 }
871
872 /*
873 * bond_do_fail_over_mac
874 *
875 * Perform special MAC address swapping for fail_over_mac settings
876 *
877 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
878 */
879 static void bond_do_fail_over_mac(struct bonding *bond,
880 struct slave *new_active,
881 struct slave *old_active)
882 __releases(&bond->curr_slave_lock)
883 __releases(&bond->lock)
884 __acquires(&bond->lock)
885 __acquires(&bond->curr_slave_lock)
886 {
887 u8 tmp_mac[ETH_ALEN];
888 struct sockaddr saddr;
889 int rv;
890
891 switch (bond->params.fail_over_mac) {
892 case BOND_FOM_ACTIVE:
893 if (new_active) {
894 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
895 new_active->dev->addr_len);
896 write_unlock_bh(&bond->curr_slave_lock);
897 read_unlock(&bond->lock);
898 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
899 read_lock(&bond->lock);
900 write_lock_bh(&bond->curr_slave_lock);
901 }
902 break;
903 case BOND_FOM_FOLLOW:
904 /*
905 * if new_active && old_active, swap them
906 * if just old_active, do nothing (going to no active slave)
907 * if just new_active, set new_active to bond's MAC
908 */
909 if (!new_active)
910 return;
911
912 write_unlock_bh(&bond->curr_slave_lock);
913 read_unlock(&bond->lock);
914
915 if (old_active) {
916 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
917 memcpy(saddr.sa_data, old_active->dev->dev_addr,
918 ETH_ALEN);
919 saddr.sa_family = new_active->dev->type;
920 } else {
921 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
922 saddr.sa_family = bond->dev->type;
923 }
924
925 rv = dev_set_mac_address(new_active->dev, &saddr);
926 if (rv) {
927 pr_err("%s: Error %d setting MAC of slave %s\n",
928 bond->dev->name, -rv, new_active->dev->name);
929 goto out;
930 }
931
932 if (!old_active)
933 goto out;
934
935 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
936 saddr.sa_family = old_active->dev->type;
937
938 rv = dev_set_mac_address(old_active->dev, &saddr);
939 if (rv)
940 pr_err("%s: Error %d setting MAC of slave %s\n",
941 bond->dev->name, -rv, new_active->dev->name);
942 out:
943 read_lock(&bond->lock);
944 write_lock_bh(&bond->curr_slave_lock);
945 break;
946 default:
947 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
948 bond->dev->name, bond->params.fail_over_mac);
949 break;
950 }
951
952 }
953
954 static bool bond_should_change_active(struct bonding *bond)
955 {
956 struct slave *prim = bond->primary_slave;
957 struct slave *curr = bond->curr_active_slave;
958
959 if (!prim || !curr || curr->link != BOND_LINK_UP)
960 return true;
961 if (bond->force_primary) {
962 bond->force_primary = false;
963 return true;
964 }
965 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
966 (prim->speed < curr->speed ||
967 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
968 return false;
969 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
970 return false;
971 return true;
972 }
973
974 /**
975 * find_best_interface - select the best available slave to be the active one
976 * @bond: our bonding struct
977 *
978 * Warning: Caller must hold curr_slave_lock for writing.
979 */
980 static struct slave *bond_find_best_slave(struct bonding *bond)
981 {
982 struct slave *new_active, *old_active;
983 struct slave *bestslave = NULL;
984 int mintime = bond->params.updelay;
985 int i;
986
987 new_active = bond->curr_active_slave;
988
989 if (!new_active) { /* there were no active slaves left */
990 if (bond->slave_cnt > 0) /* found one slave */
991 new_active = bond->first_slave;
992 else
993 return NULL; /* still no slave, return NULL */
994 }
995
996 if ((bond->primary_slave) &&
997 bond->primary_slave->link == BOND_LINK_UP &&
998 bond_should_change_active(bond)) {
999 new_active = bond->primary_slave;
1000 }
1001
1002 /* remember where to stop iterating over the slaves */
1003 old_active = new_active;
1004
1005 bond_for_each_slave_from(bond, new_active, i, old_active) {
1006 if (new_active->link == BOND_LINK_UP) {
1007 return new_active;
1008 } else if (new_active->link == BOND_LINK_BACK &&
1009 IS_UP(new_active->dev)) {
1010 /* link up, but waiting for stabilization */
1011 if (new_active->delay < mintime) {
1012 mintime = new_active->delay;
1013 bestslave = new_active;
1014 }
1015 }
1016 }
1017
1018 return bestslave;
1019 }
1020
1021 static bool bond_should_notify_peers(struct bonding *bond)
1022 {
1023 struct slave *slave = bond->curr_active_slave;
1024
1025 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1026 bond->dev->name, slave ? slave->dev->name : "NULL");
1027
1028 if (!slave || !bond->send_peer_notif ||
1029 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1030 return false;
1031
1032 bond->send_peer_notif--;
1033 return true;
1034 }
1035
1036 /**
1037 * change_active_interface - change the active slave into the specified one
1038 * @bond: our bonding struct
1039 * @new: the new slave to make the active one
1040 *
1041 * Set the new slave to the bond's settings and unset them on the old
1042 * curr_active_slave.
1043 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1044 *
1045 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1046 * because it is apparently the best available slave we have, even though its
1047 * updelay hasn't timed out yet.
1048 *
1049 * If new_active is not NULL, caller must hold bond->lock for read and
1050 * curr_slave_lock for write_bh.
1051 */
1052 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1053 {
1054 struct slave *old_active = bond->curr_active_slave;
1055
1056 if (old_active == new_active)
1057 return;
1058
1059 if (new_active) {
1060 new_active->jiffies = jiffies;
1061
1062 if (new_active->link == BOND_LINK_BACK) {
1063 if (USES_PRIMARY(bond->params.mode)) {
1064 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1065 bond->dev->name, new_active->dev->name,
1066 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1067 }
1068
1069 new_active->delay = 0;
1070 new_active->link = BOND_LINK_UP;
1071
1072 if (bond->params.mode == BOND_MODE_8023AD)
1073 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1074
1075 if (bond_is_lb(bond))
1076 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1077 } else {
1078 if (USES_PRIMARY(bond->params.mode)) {
1079 pr_info("%s: making interface %s the new active one.\n",
1080 bond->dev->name, new_active->dev->name);
1081 }
1082 }
1083 }
1084
1085 if (USES_PRIMARY(bond->params.mode))
1086 bond_mc_swap(bond, new_active, old_active);
1087
1088 if (bond_is_lb(bond)) {
1089 bond_alb_handle_active_change(bond, new_active);
1090 if (old_active)
1091 bond_set_slave_inactive_flags(old_active);
1092 if (new_active)
1093 bond_set_slave_active_flags(new_active);
1094 } else {
1095 bond->curr_active_slave = new_active;
1096 }
1097
1098 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1099 if (old_active)
1100 bond_set_slave_inactive_flags(old_active);
1101
1102 if (new_active) {
1103 bool should_notify_peers = false;
1104
1105 bond_set_slave_active_flags(new_active);
1106
1107 if (bond->params.fail_over_mac)
1108 bond_do_fail_over_mac(bond, new_active,
1109 old_active);
1110
1111 if (netif_running(bond->dev)) {
1112 bond->send_peer_notif =
1113 bond->params.num_peer_notif;
1114 should_notify_peers =
1115 bond_should_notify_peers(bond);
1116 }
1117
1118 write_unlock_bh(&bond->curr_slave_lock);
1119 read_unlock(&bond->lock);
1120
1121 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1122 if (should_notify_peers)
1123 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1124 bond->dev);
1125
1126 read_lock(&bond->lock);
1127 write_lock_bh(&bond->curr_slave_lock);
1128 }
1129 }
1130
1131 /* resend IGMP joins since active slave has changed or
1132 * all were sent on curr_active_slave.
1133 * resend only if bond is brought up with the affected
1134 * bonding modes and the retransmission is enabled */
1135 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1136 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1137 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1138 bond->igmp_retrans = bond->params.resend_igmp;
1139 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1140 }
1141 }
1142
1143 /**
1144 * bond_select_active_slave - select a new active slave, if needed
1145 * @bond: our bonding struct
1146 *
1147 * This functions should be called when one of the following occurs:
1148 * - The old curr_active_slave has been released or lost its link.
1149 * - The primary_slave has got its link back.
1150 * - A slave has got its link back and there's no old curr_active_slave.
1151 *
1152 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1153 */
1154 void bond_select_active_slave(struct bonding *bond)
1155 {
1156 struct slave *best_slave;
1157 int rv;
1158
1159 best_slave = bond_find_best_slave(bond);
1160 if (best_slave != bond->curr_active_slave) {
1161 bond_change_active_slave(bond, best_slave);
1162 rv = bond_set_carrier(bond);
1163 if (!rv)
1164 return;
1165
1166 if (netif_carrier_ok(bond->dev)) {
1167 pr_info("%s: first active interface up!\n",
1168 bond->dev->name);
1169 } else {
1170 pr_info("%s: now running without any active interface !\n",
1171 bond->dev->name);
1172 }
1173 }
1174 }
1175
1176 /*--------------------------- slave list handling ---------------------------*/
1177
1178 /*
1179 * This function attaches the slave to the end of list.
1180 *
1181 * bond->lock held for writing by caller.
1182 */
1183 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1184 {
1185 if (bond->first_slave == NULL) { /* attaching the first slave */
1186 new_slave->next = new_slave;
1187 new_slave->prev = new_slave;
1188 bond->first_slave = new_slave;
1189 } else {
1190 new_slave->next = bond->first_slave;
1191 new_slave->prev = bond->first_slave->prev;
1192 new_slave->next->prev = new_slave;
1193 new_slave->prev->next = new_slave;
1194 }
1195
1196 bond->slave_cnt++;
1197 }
1198
1199 /*
1200 * This function detaches the slave from the list.
1201 * WARNING: no check is made to verify if the slave effectively
1202 * belongs to <bond>.
1203 * Nothing is freed on return, structures are just unchained.
1204 * If any slave pointer in bond was pointing to <slave>,
1205 * it should be changed by the calling function.
1206 *
1207 * bond->lock held for writing by caller.
1208 */
1209 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1210 {
1211 if (slave->next)
1212 slave->next->prev = slave->prev;
1213
1214 if (slave->prev)
1215 slave->prev->next = slave->next;
1216
1217 if (bond->first_slave == slave) { /* slave is the first slave */
1218 if (bond->slave_cnt > 1) { /* there are more slave */
1219 bond->first_slave = slave->next;
1220 } else {
1221 bond->first_slave = NULL; /* slave was the last one */
1222 }
1223 }
1224
1225 slave->next = NULL;
1226 slave->prev = NULL;
1227 bond->slave_cnt--;
1228 }
1229
1230 #ifdef CONFIG_NET_POLL_CONTROLLER
1231 static inline int slave_enable_netpoll(struct slave *slave)
1232 {
1233 struct netpoll *np;
1234 int err = 0;
1235
1236 np = kzalloc(sizeof(*np), GFP_ATOMIC);
1237 err = -ENOMEM;
1238 if (!np)
1239 goto out;
1240
1241 err = __netpoll_setup(np, slave->dev, GFP_ATOMIC);
1242 if (err) {
1243 kfree(np);
1244 goto out;
1245 }
1246 slave->np = np;
1247 out:
1248 return err;
1249 }
1250 static inline void slave_disable_netpoll(struct slave *slave)
1251 {
1252 struct netpoll *np = slave->np;
1253
1254 if (!np)
1255 return;
1256
1257 slave->np = NULL;
1258 __netpoll_free_async(np);
1259 }
1260 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1261 {
1262 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1263 return false;
1264 if (!slave_dev->netdev_ops->ndo_poll_controller)
1265 return false;
1266 return true;
1267 }
1268
1269 static void bond_poll_controller(struct net_device *bond_dev)
1270 {
1271 }
1272
1273 static void __bond_netpoll_cleanup(struct bonding *bond)
1274 {
1275 struct slave *slave;
1276 int i;
1277
1278 bond_for_each_slave(bond, slave, i)
1279 if (IS_UP(slave->dev))
1280 slave_disable_netpoll(slave);
1281 }
1282 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1283 {
1284 struct bonding *bond = netdev_priv(bond_dev);
1285
1286 read_lock(&bond->lock);
1287 __bond_netpoll_cleanup(bond);
1288 read_unlock(&bond->lock);
1289 }
1290
1291 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, gfp_t gfp)
1292 {
1293 struct bonding *bond = netdev_priv(dev);
1294 struct slave *slave;
1295 int i, err = 0;
1296
1297 read_lock(&bond->lock);
1298 bond_for_each_slave(bond, slave, i) {
1299 err = slave_enable_netpoll(slave);
1300 if (err) {
1301 __bond_netpoll_cleanup(bond);
1302 break;
1303 }
1304 }
1305 read_unlock(&bond->lock);
1306 return err;
1307 }
1308
1309 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1310 {
1311 return bond->dev->npinfo;
1312 }
1313
1314 #else
1315 static inline int slave_enable_netpoll(struct slave *slave)
1316 {
1317 return 0;
1318 }
1319 static inline void slave_disable_netpoll(struct slave *slave)
1320 {
1321 }
1322 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1323 {
1324 }
1325 #endif
1326
1327 /*---------------------------------- IOCTL ----------------------------------*/
1328
1329 static void bond_set_dev_addr(struct net_device *bond_dev,
1330 struct net_device *slave_dev)
1331 {
1332 pr_debug("bond_dev=%p\n", bond_dev);
1333 pr_debug("slave_dev=%p\n", slave_dev);
1334 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1335 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1336 bond_dev->addr_assign_type = NET_ADDR_SET;
1337 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
1338 }
1339
1340 static netdev_features_t bond_fix_features(struct net_device *dev,
1341 netdev_features_t features)
1342 {
1343 struct slave *slave;
1344 struct bonding *bond = netdev_priv(dev);
1345 netdev_features_t mask;
1346 int i;
1347
1348 read_lock(&bond->lock);
1349
1350 if (!bond->first_slave) {
1351 /* Disable adding VLANs to empty bond. But why? --mq */
1352 features |= NETIF_F_VLAN_CHALLENGED;
1353 goto out;
1354 }
1355
1356 mask = features;
1357 features &= ~NETIF_F_ONE_FOR_ALL;
1358 features |= NETIF_F_ALL_FOR_ALL;
1359
1360 bond_for_each_slave(bond, slave, i) {
1361 features = netdev_increment_features(features,
1362 slave->dev->features,
1363 mask);
1364 }
1365
1366 out:
1367 read_unlock(&bond->lock);
1368 return features;
1369 }
1370
1371 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1372 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1373 NETIF_F_HIGHDMA | NETIF_F_LRO)
1374
1375 static void bond_compute_features(struct bonding *bond)
1376 {
1377 struct slave *slave;
1378 struct net_device *bond_dev = bond->dev;
1379 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1380 unsigned short max_hard_header_len = ETH_HLEN;
1381 unsigned int gso_max_size = GSO_MAX_SIZE;
1382 u16 gso_max_segs = GSO_MAX_SEGS;
1383 int i;
1384 unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1385
1386 read_lock(&bond->lock);
1387
1388 if (!bond->first_slave)
1389 goto done;
1390
1391 bond_for_each_slave(bond, slave, i) {
1392 vlan_features = netdev_increment_features(vlan_features,
1393 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1394
1395 dst_release_flag &= slave->dev->priv_flags;
1396 if (slave->dev->hard_header_len > max_hard_header_len)
1397 max_hard_header_len = slave->dev->hard_header_len;
1398
1399 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1400 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1401 }
1402
1403 done:
1404 bond_dev->vlan_features = vlan_features;
1405 bond_dev->hard_header_len = max_hard_header_len;
1406 bond_dev->gso_max_segs = gso_max_segs;
1407 netif_set_gso_max_size(bond_dev, gso_max_size);
1408
1409 flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1410 bond_dev->priv_flags = flags | dst_release_flag;
1411
1412 read_unlock(&bond->lock);
1413
1414 netdev_change_features(bond_dev);
1415 }
1416
1417 static void bond_setup_by_slave(struct net_device *bond_dev,
1418 struct net_device *slave_dev)
1419 {
1420 struct bonding *bond = netdev_priv(bond_dev);
1421
1422 bond_dev->header_ops = slave_dev->header_ops;
1423
1424 bond_dev->type = slave_dev->type;
1425 bond_dev->hard_header_len = slave_dev->hard_header_len;
1426 bond_dev->addr_len = slave_dev->addr_len;
1427
1428 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1429 slave_dev->addr_len);
1430 bond->setup_by_slave = 1;
1431 }
1432
1433 /* On bonding slaves other than the currently active slave, suppress
1434 * duplicates except for alb non-mcast/bcast.
1435 */
1436 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1437 struct slave *slave,
1438 struct bonding *bond)
1439 {
1440 if (bond_is_slave_inactive(slave)) {
1441 if (bond->params.mode == BOND_MODE_ALB &&
1442 skb->pkt_type != PACKET_BROADCAST &&
1443 skb->pkt_type != PACKET_MULTICAST)
1444 return false;
1445 return true;
1446 }
1447 return false;
1448 }
1449
1450 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1451 {
1452 struct sk_buff *skb = *pskb;
1453 struct slave *slave;
1454 struct bonding *bond;
1455 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1456 struct slave *);
1457 int ret = RX_HANDLER_ANOTHER;
1458
1459 skb = skb_share_check(skb, GFP_ATOMIC);
1460 if (unlikely(!skb))
1461 return RX_HANDLER_CONSUMED;
1462
1463 *pskb = skb;
1464
1465 slave = bond_slave_get_rcu(skb->dev);
1466 bond = slave->bond;
1467
1468 if (bond->params.arp_interval)
1469 slave->dev->last_rx = jiffies;
1470
1471 recv_probe = ACCESS_ONCE(bond->recv_probe);
1472 if (recv_probe) {
1473 ret = recv_probe(skb, bond, slave);
1474 if (ret == RX_HANDLER_CONSUMED) {
1475 consume_skb(skb);
1476 return ret;
1477 }
1478 }
1479
1480 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1481 return RX_HANDLER_EXACT;
1482 }
1483
1484 skb->dev = bond->dev;
1485
1486 if (bond->params.mode == BOND_MODE_ALB &&
1487 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1488 skb->pkt_type == PACKET_HOST) {
1489
1490 if (unlikely(skb_cow_head(skb,
1491 skb->data - skb_mac_header(skb)))) {
1492 kfree_skb(skb);
1493 return RX_HANDLER_CONSUMED;
1494 }
1495 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1496 }
1497
1498 return ret;
1499 }
1500
1501 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1502 struct net_device *slave_dev)
1503 {
1504 int err;
1505
1506 err = netdev_master_upper_dev_link(slave_dev, bond_dev);
1507 if (err)
1508 return err;
1509 slave_dev->flags |= IFF_SLAVE;
1510 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1511 return 0;
1512 }
1513
1514 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1515 struct net_device *slave_dev)
1516 {
1517 netdev_upper_dev_unlink(slave_dev, bond_dev);
1518 slave_dev->flags &= ~IFF_SLAVE;
1519 rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE);
1520 }
1521
1522 /* enslave device <slave> to bond device <master> */
1523 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1524 {
1525 struct bonding *bond = netdev_priv(bond_dev);
1526 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1527 struct slave *new_slave = NULL;
1528 struct netdev_hw_addr *ha;
1529 struct sockaddr addr;
1530 int link_reporting;
1531 int res = 0;
1532
1533 if (!bond->params.use_carrier &&
1534 slave_dev->ethtool_ops->get_link == NULL &&
1535 slave_ops->ndo_do_ioctl == NULL) {
1536 pr_warning("%s: Warning: no link monitoring support for %s\n",
1537 bond_dev->name, slave_dev->name);
1538 }
1539
1540 /* already enslaved */
1541 if (slave_dev->flags & IFF_SLAVE) {
1542 pr_debug("Error, Device was already enslaved\n");
1543 return -EBUSY;
1544 }
1545
1546 /* vlan challenged mutual exclusion */
1547 /* no need to lock since we're protected by rtnl_lock */
1548 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1549 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1550 if (vlan_uses_dev(bond_dev)) {
1551 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1552 bond_dev->name, slave_dev->name, bond_dev->name);
1553 return -EPERM;
1554 } else {
1555 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1556 bond_dev->name, slave_dev->name,
1557 slave_dev->name, bond_dev->name);
1558 }
1559 } else {
1560 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1561 }
1562
1563 /*
1564 * Old ifenslave binaries are no longer supported. These can
1565 * be identified with moderate accuracy by the state of the slave:
1566 * the current ifenslave will set the interface down prior to
1567 * enslaving it; the old ifenslave will not.
1568 */
1569 if ((slave_dev->flags & IFF_UP)) {
1570 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1571 slave_dev->name);
1572 res = -EPERM;
1573 goto err_undo_flags;
1574 }
1575
1576 /* set bonding device ether type by slave - bonding netdevices are
1577 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1578 * there is a need to override some of the type dependent attribs/funcs.
1579 *
1580 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1581 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1582 */
1583 if (bond->slave_cnt == 0) {
1584 if (bond_dev->type != slave_dev->type) {
1585 pr_debug("%s: change device type from %d to %d\n",
1586 bond_dev->name,
1587 bond_dev->type, slave_dev->type);
1588
1589 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1590 bond_dev);
1591 res = notifier_to_errno(res);
1592 if (res) {
1593 pr_err("%s: refused to change device type\n",
1594 bond_dev->name);
1595 res = -EBUSY;
1596 goto err_undo_flags;
1597 }
1598
1599 /* Flush unicast and multicast addresses */
1600 dev_uc_flush(bond_dev);
1601 dev_mc_flush(bond_dev);
1602
1603 if (slave_dev->type != ARPHRD_ETHER)
1604 bond_setup_by_slave(bond_dev, slave_dev);
1605 else {
1606 ether_setup(bond_dev);
1607 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1608 }
1609
1610 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1611 bond_dev);
1612 }
1613 } else if (bond_dev->type != slave_dev->type) {
1614 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1615 slave_dev->name,
1616 slave_dev->type, bond_dev->type);
1617 res = -EINVAL;
1618 goto err_undo_flags;
1619 }
1620
1621 if (slave_ops->ndo_set_mac_address == NULL) {
1622 if (bond->slave_cnt == 0) {
1623 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1624 bond_dev->name);
1625 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1626 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1627 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",
1628 bond_dev->name);
1629 res = -EOPNOTSUPP;
1630 goto err_undo_flags;
1631 }
1632 }
1633
1634 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1635
1636 /* If this is the first slave, then we need to set the master's hardware
1637 * address to be the same as the slave's. */
1638 if (bond->slave_cnt == 0 && bond->dev_addr_from_first)
1639 bond_set_dev_addr(bond->dev, slave_dev);
1640
1641 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1642 if (!new_slave) {
1643 res = -ENOMEM;
1644 goto err_undo_flags;
1645 }
1646
1647 /*
1648 * Set the new_slave's queue_id to be zero. Queue ID mapping
1649 * is set via sysfs or module option if desired.
1650 */
1651 new_slave->queue_id = 0;
1652
1653 /* Save slave's original mtu and then set it to match the bond */
1654 new_slave->original_mtu = slave_dev->mtu;
1655 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1656 if (res) {
1657 pr_debug("Error %d calling dev_set_mtu\n", res);
1658 goto err_free;
1659 }
1660
1661 /*
1662 * Save slave's original ("permanent") mac address for modes
1663 * that need it, and for restoring it upon release, and then
1664 * set it to the master's address
1665 */
1666 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1667
1668 if (!bond->params.fail_over_mac) {
1669 /*
1670 * Set slave to master's mac address. The application already
1671 * set the master's mac address to that of the first slave
1672 */
1673 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1674 addr.sa_family = slave_dev->type;
1675 res = dev_set_mac_address(slave_dev, &addr);
1676 if (res) {
1677 pr_debug("Error %d calling set_mac_address\n", res);
1678 goto err_restore_mtu;
1679 }
1680 }
1681
1682 res = bond_master_upper_dev_link(bond_dev, slave_dev);
1683 if (res) {
1684 pr_debug("Error %d calling bond_master_upper_dev_link\n", res);
1685 goto err_restore_mac;
1686 }
1687
1688 /* open the slave since the application closed it */
1689 res = dev_open(slave_dev);
1690 if (res) {
1691 pr_debug("Opening slave %s failed\n", slave_dev->name);
1692 goto err_unset_master;
1693 }
1694
1695 new_slave->bond = bond;
1696 new_slave->dev = slave_dev;
1697 slave_dev->priv_flags |= IFF_BONDING;
1698
1699 if (bond_is_lb(bond)) {
1700 /* bond_alb_init_slave() must be called before all other stages since
1701 * it might fail and we do not want to have to undo everything
1702 */
1703 res = bond_alb_init_slave(bond, new_slave);
1704 if (res)
1705 goto err_close;
1706 }
1707
1708 /* If the mode USES_PRIMARY, then the new slave gets the
1709 * master's promisc (and mc) settings only if it becomes the
1710 * curr_active_slave, and that is taken care of later when calling
1711 * bond_change_active()
1712 */
1713 if (!USES_PRIMARY(bond->params.mode)) {
1714 /* set promiscuity level to new slave */
1715 if (bond_dev->flags & IFF_PROMISC) {
1716 res = dev_set_promiscuity(slave_dev, 1);
1717 if (res)
1718 goto err_close;
1719 }
1720
1721 /* set allmulti level to new slave */
1722 if (bond_dev->flags & IFF_ALLMULTI) {
1723 res = dev_set_allmulti(slave_dev, 1);
1724 if (res)
1725 goto err_close;
1726 }
1727
1728 netif_addr_lock_bh(bond_dev);
1729 /* upload master's mc_list to new slave */
1730 netdev_for_each_mc_addr(ha, bond_dev)
1731 dev_mc_add(slave_dev, ha->addr);
1732 netif_addr_unlock_bh(bond_dev);
1733 }
1734
1735 if (bond->params.mode == BOND_MODE_8023AD) {
1736 /* add lacpdu mc addr to mc list */
1737 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1738
1739 dev_mc_add(slave_dev, lacpdu_multicast);
1740 }
1741
1742 bond_add_vlans_on_slave(bond, slave_dev);
1743
1744 write_lock_bh(&bond->lock);
1745
1746 bond_attach_slave(bond, new_slave);
1747
1748 new_slave->delay = 0;
1749 new_slave->link_failure_count = 0;
1750
1751 write_unlock_bh(&bond->lock);
1752
1753 bond_compute_features(bond);
1754
1755 bond_update_speed_duplex(new_slave);
1756
1757 read_lock(&bond->lock);
1758
1759 new_slave->last_arp_rx = jiffies -
1760 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1761
1762 if (bond->params.miimon && !bond->params.use_carrier) {
1763 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1764
1765 if ((link_reporting == -1) && !bond->params.arp_interval) {
1766 /*
1767 * miimon is set but a bonded network driver
1768 * does not support ETHTOOL/MII and
1769 * arp_interval is not set. Note: if
1770 * use_carrier is enabled, we will never go
1771 * here (because netif_carrier is always
1772 * supported); thus, we don't need to change
1773 * the messages for netif_carrier.
1774 */
1775 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",
1776 bond_dev->name, slave_dev->name);
1777 } else if (link_reporting == -1) {
1778 /* unable get link status using mii/ethtool */
1779 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",
1780 bond_dev->name, slave_dev->name);
1781 }
1782 }
1783
1784 /* check for initial state */
1785 if (bond->params.miimon) {
1786 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1787 if (bond->params.updelay) {
1788 new_slave->link = BOND_LINK_BACK;
1789 new_slave->delay = bond->params.updelay;
1790 } else {
1791 new_slave->link = BOND_LINK_UP;
1792 }
1793 } else {
1794 new_slave->link = BOND_LINK_DOWN;
1795 }
1796 } else if (bond->params.arp_interval) {
1797 new_slave->link = (netif_carrier_ok(slave_dev) ?
1798 BOND_LINK_UP : BOND_LINK_DOWN);
1799 } else {
1800 new_slave->link = BOND_LINK_UP;
1801 }
1802
1803 if (new_slave->link != BOND_LINK_DOWN)
1804 new_slave->jiffies = jiffies;
1805 pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
1806 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1807 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1808
1809 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1810 /* if there is a primary slave, remember it */
1811 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1812 bond->primary_slave = new_slave;
1813 bond->force_primary = true;
1814 }
1815 }
1816
1817 write_lock_bh(&bond->curr_slave_lock);
1818
1819 switch (bond->params.mode) {
1820 case BOND_MODE_ACTIVEBACKUP:
1821 bond_set_slave_inactive_flags(new_slave);
1822 bond_select_active_slave(bond);
1823 break;
1824 case BOND_MODE_8023AD:
1825 /* in 802.3ad mode, the internal mechanism
1826 * will activate the slaves in the selected
1827 * aggregator
1828 */
1829 bond_set_slave_inactive_flags(new_slave);
1830 /* if this is the first slave */
1831 if (bond->slave_cnt == 1) {
1832 SLAVE_AD_INFO(new_slave).id = 1;
1833 /* Initialize AD with the number of times that the AD timer is called in 1 second
1834 * can be called only after the mac address of the bond is set
1835 */
1836 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1837 } else {
1838 SLAVE_AD_INFO(new_slave).id =
1839 SLAVE_AD_INFO(new_slave->prev).id + 1;
1840 }
1841
1842 bond_3ad_bind_slave(new_slave);
1843 break;
1844 case BOND_MODE_TLB:
1845 case BOND_MODE_ALB:
1846 bond_set_active_slave(new_slave);
1847 bond_set_slave_inactive_flags(new_slave);
1848 bond_select_active_slave(bond);
1849 break;
1850 default:
1851 pr_debug("This slave is always active in trunk mode\n");
1852
1853 /* always active in trunk mode */
1854 bond_set_active_slave(new_slave);
1855
1856 /* In trunking mode there is little meaning to curr_active_slave
1857 * anyway (it holds no special properties of the bond device),
1858 * so we can change it without calling change_active_interface()
1859 */
1860 if (!bond->curr_active_slave && new_slave->link == BOND_LINK_UP)
1861 bond->curr_active_slave = new_slave;
1862
1863 break;
1864 } /* switch(bond_mode) */
1865
1866 write_unlock_bh(&bond->curr_slave_lock);
1867
1868 bond_set_carrier(bond);
1869
1870 #ifdef CONFIG_NET_POLL_CONTROLLER
1871 slave_dev->npinfo = bond_netpoll_info(bond);
1872 if (slave_dev->npinfo) {
1873 if (slave_enable_netpoll(new_slave)) {
1874 read_unlock(&bond->lock);
1875 pr_info("Error, %s: master_dev is using netpoll, "
1876 "but new slave device does not support netpoll.\n",
1877 bond_dev->name);
1878 res = -EBUSY;
1879 goto err_detach;
1880 }
1881 }
1882 #endif
1883
1884 read_unlock(&bond->lock);
1885
1886 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1887 if (res)
1888 goto err_detach;
1889
1890 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1891 new_slave);
1892 if (res) {
1893 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1894 goto err_dest_symlinks;
1895 }
1896
1897 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1898 bond_dev->name, slave_dev->name,
1899 bond_is_active_slave(new_slave) ? "n active" : " backup",
1900 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1901
1902 /* enslave is successful */
1903 return 0;
1904
1905 /* Undo stages on error */
1906 err_dest_symlinks:
1907 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1908
1909 err_detach:
1910 if (!USES_PRIMARY(bond->params.mode)) {
1911 netif_addr_lock_bh(bond_dev);
1912 bond_mc_list_flush(bond_dev, slave_dev);
1913 netif_addr_unlock_bh(bond_dev);
1914 }
1915 bond_del_vlans_from_slave(bond, slave_dev);
1916 write_lock_bh(&bond->lock);
1917 bond_detach_slave(bond, new_slave);
1918 if (bond->primary_slave == new_slave)
1919 bond->primary_slave = NULL;
1920 if (bond->curr_active_slave == new_slave) {
1921 bond_change_active_slave(bond, NULL);
1922 write_unlock_bh(&bond->lock);
1923 read_lock(&bond->lock);
1924 write_lock_bh(&bond->curr_slave_lock);
1925 bond_select_active_slave(bond);
1926 write_unlock_bh(&bond->curr_slave_lock);
1927 read_unlock(&bond->lock);
1928 } else {
1929 write_unlock_bh(&bond->lock);
1930 }
1931 slave_disable_netpoll(new_slave);
1932
1933 err_close:
1934 slave_dev->priv_flags &= ~IFF_BONDING;
1935 dev_close(slave_dev);
1936
1937 err_unset_master:
1938 bond_upper_dev_unlink(bond_dev, slave_dev);
1939
1940 err_restore_mac:
1941 if (!bond->params.fail_over_mac) {
1942 /* XXX TODO - fom follow mode needs to change master's
1943 * MAC if this slave's MAC is in use by the bond, or at
1944 * least print a warning.
1945 */
1946 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1947 addr.sa_family = slave_dev->type;
1948 dev_set_mac_address(slave_dev, &addr);
1949 }
1950
1951 err_restore_mtu:
1952 dev_set_mtu(slave_dev, new_slave->original_mtu);
1953
1954 err_free:
1955 kfree(new_slave);
1956
1957 err_undo_flags:
1958 bond_compute_features(bond);
1959
1960 return res;
1961 }
1962
1963 /*
1964 * Try to release the slave device <slave> from the bond device <master>
1965 * It is legal to access curr_active_slave without a lock because all the function
1966 * is write-locked. If "all" is true it means that the function is being called
1967 * while destroying a bond interface and all slaves are being released.
1968 *
1969 * The rules for slave state should be:
1970 * for Active/Backup:
1971 * Active stays on all backups go down
1972 * for Bonded connections:
1973 * The first up interface should be left on and all others downed.
1974 */
1975 static int __bond_release_one(struct net_device *bond_dev,
1976 struct net_device *slave_dev,
1977 bool all)
1978 {
1979 struct bonding *bond = netdev_priv(bond_dev);
1980 struct slave *slave, *oldcurrent;
1981 struct sockaddr addr;
1982 netdev_features_t old_features = bond_dev->features;
1983
1984 /* slave is not a slave or master is not master of this slave */
1985 if (!(slave_dev->flags & IFF_SLAVE) ||
1986 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1987 pr_err("%s: Error: cannot release %s.\n",
1988 bond_dev->name, slave_dev->name);
1989 return -EINVAL;
1990 }
1991
1992 block_netpoll_tx();
1993 write_lock_bh(&bond->lock);
1994
1995 slave = bond_get_slave_by_dev(bond, slave_dev);
1996 if (!slave) {
1997 /* not a slave of this bond */
1998 pr_info("%s: %s not enslaved\n",
1999 bond_dev->name, slave_dev->name);
2000 write_unlock_bh(&bond->lock);
2001 unblock_netpoll_tx();
2002 return -EINVAL;
2003 }
2004
2005 write_unlock_bh(&bond->lock);
2006 /* unregister rx_handler early so bond_handle_frame wouldn't be called
2007 * for this slave anymore.
2008 */
2009 netdev_rx_handler_unregister(slave_dev);
2010 write_lock_bh(&bond->lock);
2011
2012 if (!all && !bond->params.fail_over_mac) {
2013 if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
2014 bond->slave_cnt > 1)
2015 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",
2016 bond_dev->name, slave_dev->name,
2017 slave->perm_hwaddr,
2018 bond_dev->name, slave_dev->name);
2019 }
2020
2021 /* Inform AD package of unbinding of slave. */
2022 if (bond->params.mode == BOND_MODE_8023AD) {
2023 /* must be called before the slave is
2024 * detached from the list
2025 */
2026 bond_3ad_unbind_slave(slave);
2027 }
2028
2029 pr_info("%s: releasing %s interface %s\n",
2030 bond_dev->name,
2031 bond_is_active_slave(slave) ? "active" : "backup",
2032 slave_dev->name);
2033
2034 oldcurrent = bond->curr_active_slave;
2035
2036 bond->current_arp_slave = NULL;
2037
2038 /* release the slave from its bond */
2039 bond_detach_slave(bond, slave);
2040
2041 if (bond->primary_slave == slave)
2042 bond->primary_slave = NULL;
2043
2044 if (oldcurrent == slave)
2045 bond_change_active_slave(bond, NULL);
2046
2047 if (bond_is_lb(bond)) {
2048 /* Must be called only after the slave has been
2049 * detached from the list and the curr_active_slave
2050 * has been cleared (if our_slave == old_current),
2051 * but before a new active slave is selected.
2052 */
2053 write_unlock_bh(&bond->lock);
2054 bond_alb_deinit_slave(bond, slave);
2055 write_lock_bh(&bond->lock);
2056 }
2057
2058 if (all) {
2059 bond->curr_active_slave = NULL;
2060 } else if (oldcurrent == slave) {
2061 /*
2062 * Note that we hold RTNL over this sequence, so there
2063 * is no concern that another slave add/remove event
2064 * will interfere.
2065 */
2066 write_unlock_bh(&bond->lock);
2067 read_lock(&bond->lock);
2068 write_lock_bh(&bond->curr_slave_lock);
2069
2070 bond_select_active_slave(bond);
2071
2072 write_unlock_bh(&bond->curr_slave_lock);
2073 read_unlock(&bond->lock);
2074 write_lock_bh(&bond->lock);
2075 }
2076
2077 if (bond->slave_cnt == 0) {
2078 bond_set_carrier(bond);
2079 eth_hw_addr_random(bond_dev);
2080 bond->dev_addr_from_first = true;
2081
2082 if (bond_vlan_used(bond)) {
2083 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2084 bond_dev->name, bond_dev->name);
2085 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2086 bond_dev->name);
2087 }
2088 }
2089
2090 write_unlock_bh(&bond->lock);
2091 unblock_netpoll_tx();
2092
2093 if (bond->slave_cnt == 0) {
2094 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2095 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2096 }
2097
2098 bond_compute_features(bond);
2099 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2100 (old_features & NETIF_F_VLAN_CHALLENGED))
2101 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2102 bond_dev->name, slave_dev->name, bond_dev->name);
2103
2104 /* must do this from outside any spinlocks */
2105 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2106
2107 bond_del_vlans_from_slave(bond, slave_dev);
2108
2109 /* If the mode USES_PRIMARY, then we should only remove its
2110 * promisc and mc settings if it was the curr_active_slave, but that was
2111 * already taken care of above when we detached the slave
2112 */
2113 if (!USES_PRIMARY(bond->params.mode)) {
2114 /* unset promiscuity level from slave */
2115 if (bond_dev->flags & IFF_PROMISC)
2116 dev_set_promiscuity(slave_dev, -1);
2117
2118 /* unset allmulti level from slave */
2119 if (bond_dev->flags & IFF_ALLMULTI)
2120 dev_set_allmulti(slave_dev, -1);
2121
2122 /* flush master's mc_list from slave */
2123 netif_addr_lock_bh(bond_dev);
2124 bond_mc_list_flush(bond_dev, slave_dev);
2125 netif_addr_unlock_bh(bond_dev);
2126 }
2127
2128 bond_upper_dev_unlink(bond_dev, slave_dev);
2129
2130 slave_disable_netpoll(slave);
2131
2132 /* close slave before restoring its mac address */
2133 dev_close(slave_dev);
2134
2135 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2136 /* restore original ("permanent") mac address */
2137 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2138 addr.sa_family = slave_dev->type;
2139 dev_set_mac_address(slave_dev, &addr);
2140 }
2141
2142 dev_set_mtu(slave_dev, slave->original_mtu);
2143
2144 slave_dev->priv_flags &= ~IFF_BONDING;
2145
2146 kfree(slave);
2147
2148 return 0; /* deletion OK */
2149 }
2150
2151 /* A wrapper used because of ndo_del_link */
2152 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2153 {
2154 return __bond_release_one(bond_dev, slave_dev, false);
2155 }
2156
2157 /*
2158 * First release a slave and then destroy the bond if no more slaves are left.
2159 * Must be under rtnl_lock when this function is called.
2160 */
2161 static int bond_release_and_destroy(struct net_device *bond_dev,
2162 struct net_device *slave_dev)
2163 {
2164 struct bonding *bond = netdev_priv(bond_dev);
2165 int ret;
2166
2167 ret = bond_release(bond_dev, slave_dev);
2168 if ((ret == 0) && (bond->slave_cnt == 0)) {
2169 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2170 pr_info("%s: destroying bond %s.\n",
2171 bond_dev->name, bond_dev->name);
2172 unregister_netdevice(bond_dev);
2173 }
2174 return ret;
2175 }
2176
2177 /*
2178 * This function changes the active slave to slave <slave_dev>.
2179 * It returns -EINVAL in the following cases.
2180 * - <slave_dev> is not found in the list.
2181 * - There is not active slave now.
2182 * - <slave_dev> is already active.
2183 * - The link state of <slave_dev> is not BOND_LINK_UP.
2184 * - <slave_dev> is not running.
2185 * In these cases, this function does nothing.
2186 * In the other cases, current_slave pointer is changed and 0 is returned.
2187 */
2188 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2189 {
2190 struct bonding *bond = netdev_priv(bond_dev);
2191 struct slave *old_active = NULL;
2192 struct slave *new_active = NULL;
2193 int res = 0;
2194
2195 if (!USES_PRIMARY(bond->params.mode))
2196 return -EINVAL;
2197
2198 /* Verify that bond_dev is indeed the master of slave_dev */
2199 if (!(slave_dev->flags & IFF_SLAVE) ||
2200 !netdev_has_upper_dev(slave_dev, bond_dev))
2201 return -EINVAL;
2202
2203 read_lock(&bond->lock);
2204
2205 read_lock(&bond->curr_slave_lock);
2206 old_active = bond->curr_active_slave;
2207 read_unlock(&bond->curr_slave_lock);
2208
2209 new_active = bond_get_slave_by_dev(bond, slave_dev);
2210
2211 /*
2212 * Changing to the current active: do nothing; return success.
2213 */
2214 if (new_active && (new_active == old_active)) {
2215 read_unlock(&bond->lock);
2216 return 0;
2217 }
2218
2219 if ((new_active) &&
2220 (old_active) &&
2221 (new_active->link == BOND_LINK_UP) &&
2222 IS_UP(new_active->dev)) {
2223 block_netpoll_tx();
2224 write_lock_bh(&bond->curr_slave_lock);
2225 bond_change_active_slave(bond, new_active);
2226 write_unlock_bh(&bond->curr_slave_lock);
2227 unblock_netpoll_tx();
2228 } else
2229 res = -EINVAL;
2230
2231 read_unlock(&bond->lock);
2232
2233 return res;
2234 }
2235
2236 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2237 {
2238 struct bonding *bond = netdev_priv(bond_dev);
2239
2240 info->bond_mode = bond->params.mode;
2241 info->miimon = bond->params.miimon;
2242
2243 read_lock(&bond->lock);
2244 info->num_slaves = bond->slave_cnt;
2245 read_unlock(&bond->lock);
2246
2247 return 0;
2248 }
2249
2250 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2251 {
2252 struct bonding *bond = netdev_priv(bond_dev);
2253 struct slave *slave;
2254 int i, res = -ENODEV;
2255
2256 read_lock(&bond->lock);
2257
2258 bond_for_each_slave(bond, slave, i) {
2259 if (i == (int)info->slave_id) {
2260 res = 0;
2261 strcpy(info->slave_name, slave->dev->name);
2262 info->link = slave->link;
2263 info->state = bond_slave_state(slave);
2264 info->link_failure_count = slave->link_failure_count;
2265 break;
2266 }
2267 }
2268
2269 read_unlock(&bond->lock);
2270
2271 return res;
2272 }
2273
2274 /*-------------------------------- Monitoring -------------------------------*/
2275
2276
2277 static int bond_miimon_inspect(struct bonding *bond)
2278 {
2279 struct slave *slave;
2280 int i, link_state, commit = 0;
2281 bool ignore_updelay;
2282
2283 ignore_updelay = !bond->curr_active_slave ? true : false;
2284
2285 bond_for_each_slave(bond, slave, i) {
2286 slave->new_link = BOND_LINK_NOCHANGE;
2287
2288 link_state = bond_check_dev_link(bond, slave->dev, 0);
2289
2290 switch (slave->link) {
2291 case BOND_LINK_UP:
2292 if (link_state)
2293 continue;
2294
2295 slave->link = BOND_LINK_FAIL;
2296 slave->delay = bond->params.downdelay;
2297 if (slave->delay) {
2298 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2299 bond->dev->name,
2300 (bond->params.mode ==
2301 BOND_MODE_ACTIVEBACKUP) ?
2302 (bond_is_active_slave(slave) ?
2303 "active " : "backup ") : "",
2304 slave->dev->name,
2305 bond->params.downdelay * bond->params.miimon);
2306 }
2307 /*FALLTHRU*/
2308 case BOND_LINK_FAIL:
2309 if (link_state) {
2310 /*
2311 * recovered before downdelay expired
2312 */
2313 slave->link = BOND_LINK_UP;
2314 slave->jiffies = jiffies;
2315 pr_info("%s: link status up again after %d ms for interface %s.\n",
2316 bond->dev->name,
2317 (bond->params.downdelay - slave->delay) *
2318 bond->params.miimon,
2319 slave->dev->name);
2320 continue;
2321 }
2322
2323 if (slave->delay <= 0) {
2324 slave->new_link = BOND_LINK_DOWN;
2325 commit++;
2326 continue;
2327 }
2328
2329 slave->delay--;
2330 break;
2331
2332 case BOND_LINK_DOWN:
2333 if (!link_state)
2334 continue;
2335
2336 slave->link = BOND_LINK_BACK;
2337 slave->delay = bond->params.updelay;
2338
2339 if (slave->delay) {
2340 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2341 bond->dev->name, slave->dev->name,
2342 ignore_updelay ? 0 :
2343 bond->params.updelay *
2344 bond->params.miimon);
2345 }
2346 /*FALLTHRU*/
2347 case BOND_LINK_BACK:
2348 if (!link_state) {
2349 slave->link = BOND_LINK_DOWN;
2350 pr_info("%s: link status down again after %d ms for interface %s.\n",
2351 bond->dev->name,
2352 (bond->params.updelay - slave->delay) *
2353 bond->params.miimon,
2354 slave->dev->name);
2355
2356 continue;
2357 }
2358
2359 if (ignore_updelay)
2360 slave->delay = 0;
2361
2362 if (slave->delay <= 0) {
2363 slave->new_link = BOND_LINK_UP;
2364 commit++;
2365 ignore_updelay = false;
2366 continue;
2367 }
2368
2369 slave->delay--;
2370 break;
2371 }
2372 }
2373
2374 return commit;
2375 }
2376
2377 static void bond_miimon_commit(struct bonding *bond)
2378 {
2379 struct slave *slave;
2380 int i;
2381
2382 bond_for_each_slave(bond, slave, i) {
2383 switch (slave->new_link) {
2384 case BOND_LINK_NOCHANGE:
2385 continue;
2386
2387 case BOND_LINK_UP:
2388 slave->link = BOND_LINK_UP;
2389 slave->jiffies = jiffies;
2390
2391 if (bond->params.mode == BOND_MODE_8023AD) {
2392 /* prevent it from being the active one */
2393 bond_set_backup_slave(slave);
2394 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2395 /* make it immediately active */
2396 bond_set_active_slave(slave);
2397 } else if (slave != bond->primary_slave) {
2398 /* prevent it from being the active one */
2399 bond_set_backup_slave(slave);
2400 }
2401
2402 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2403 bond->dev->name, slave->dev->name,
2404 slave->speed, slave->duplex ? "full" : "half");
2405
2406 /* notify ad that the link status has changed */
2407 if (bond->params.mode == BOND_MODE_8023AD)
2408 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2409
2410 if (bond_is_lb(bond))
2411 bond_alb_handle_link_change(bond, slave,
2412 BOND_LINK_UP);
2413
2414 if (!bond->curr_active_slave ||
2415 (slave == bond->primary_slave))
2416 goto do_failover;
2417
2418 continue;
2419
2420 case BOND_LINK_DOWN:
2421 if (slave->link_failure_count < UINT_MAX)
2422 slave->link_failure_count++;
2423
2424 slave->link = BOND_LINK_DOWN;
2425
2426 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2427 bond->params.mode == BOND_MODE_8023AD)
2428 bond_set_slave_inactive_flags(slave);
2429
2430 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2431 bond->dev->name, slave->dev->name);
2432
2433 if (bond->params.mode == BOND_MODE_8023AD)
2434 bond_3ad_handle_link_change(slave,
2435 BOND_LINK_DOWN);
2436
2437 if (bond_is_lb(bond))
2438 bond_alb_handle_link_change(bond, slave,
2439 BOND_LINK_DOWN);
2440
2441 if (slave == bond->curr_active_slave)
2442 goto do_failover;
2443
2444 continue;
2445
2446 default:
2447 pr_err("%s: invalid new link %d on slave %s\n",
2448 bond->dev->name, slave->new_link,
2449 slave->dev->name);
2450 slave->new_link = BOND_LINK_NOCHANGE;
2451
2452 continue;
2453 }
2454
2455 do_failover:
2456 ASSERT_RTNL();
2457 block_netpoll_tx();
2458 write_lock_bh(&bond->curr_slave_lock);
2459 bond_select_active_slave(bond);
2460 write_unlock_bh(&bond->curr_slave_lock);
2461 unblock_netpoll_tx();
2462 }
2463
2464 bond_set_carrier(bond);
2465 }
2466
2467 /*
2468 * bond_mii_monitor
2469 *
2470 * Really a wrapper that splits the mii monitor into two phases: an
2471 * inspection, then (if inspection indicates something needs to be done)
2472 * an acquisition of appropriate locks followed by a commit phase to
2473 * implement whatever link state changes are indicated.
2474 */
2475 void bond_mii_monitor(struct work_struct *work)
2476 {
2477 struct bonding *bond = container_of(work, struct bonding,
2478 mii_work.work);
2479 bool should_notify_peers = false;
2480 unsigned long delay;
2481
2482 read_lock(&bond->lock);
2483
2484 delay = msecs_to_jiffies(bond->params.miimon);
2485
2486 if (bond->slave_cnt == 0)
2487 goto re_arm;
2488
2489 should_notify_peers = bond_should_notify_peers(bond);
2490
2491 if (bond_miimon_inspect(bond)) {
2492 read_unlock(&bond->lock);
2493
2494 /* Race avoidance with bond_close cancel of workqueue */
2495 if (!rtnl_trylock()) {
2496 read_lock(&bond->lock);
2497 delay = 1;
2498 should_notify_peers = false;
2499 goto re_arm;
2500 }
2501
2502 read_lock(&bond->lock);
2503
2504 bond_miimon_commit(bond);
2505
2506 read_unlock(&bond->lock);
2507 rtnl_unlock(); /* might sleep, hold no other locks */
2508 read_lock(&bond->lock);
2509 }
2510
2511 re_arm:
2512 if (bond->params.miimon)
2513 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2514
2515 read_unlock(&bond->lock);
2516
2517 if (should_notify_peers) {
2518 if (!rtnl_trylock()) {
2519 read_lock(&bond->lock);
2520 bond->send_peer_notif++;
2521 read_unlock(&bond->lock);
2522 return;
2523 }
2524 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2525 rtnl_unlock();
2526 }
2527 }
2528
2529 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2530 {
2531 struct vlan_entry *vlan;
2532 struct net_device *vlan_dev;
2533
2534 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2535 return 1;
2536
2537 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2538 rcu_read_lock();
2539 vlan_dev = __vlan_find_dev_deep(bond->dev, htons(ETH_P_8021Q),
2540 vlan->vlan_id);
2541 rcu_read_unlock();
2542 if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
2543 return 1;
2544 }
2545
2546 return 0;
2547 }
2548
2549 /*
2550 * We go to the (large) trouble of VLAN tagging ARP frames because
2551 * switches in VLAN mode (especially if ports are configured as
2552 * "native" to a VLAN) might not pass non-tagged frames.
2553 */
2554 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2555 {
2556 struct sk_buff *skb;
2557
2558 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2559 slave_dev->name, dest_ip, src_ip, vlan_id);
2560
2561 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2562 NULL, slave_dev->dev_addr, NULL);
2563
2564 if (!skb) {
2565 pr_err("ARP packet allocation failed\n");
2566 return;
2567 }
2568 if (vlan_id) {
2569 skb = vlan_put_tag(skb, htons(ETH_P_8021Q), vlan_id);
2570 if (!skb) {
2571 pr_err("failed to insert VLAN tag\n");
2572 return;
2573 }
2574 }
2575 arp_xmit(skb);
2576 }
2577
2578
2579 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2580 {
2581 int i, vlan_id;
2582 __be32 *targets = bond->params.arp_targets;
2583 struct vlan_entry *vlan;
2584 struct net_device *vlan_dev = NULL;
2585 struct rtable *rt;
2586
2587 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2588 __be32 addr;
2589 if (!targets[i])
2590 break;
2591 pr_debug("basa: target %x\n", targets[i]);
2592 if (!bond_vlan_used(bond)) {
2593 pr_debug("basa: empty vlan: arp_send\n");
2594 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2595 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2596 addr, 0);
2597 continue;
2598 }
2599
2600 /*
2601 * If VLANs are configured, we do a route lookup to
2602 * determine which VLAN interface would be used, so we
2603 * can tag the ARP with the proper VLAN tag.
2604 */
2605 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2606 RTO_ONLINK, 0);
2607 if (IS_ERR(rt)) {
2608 if (net_ratelimit()) {
2609 pr_warning("%s: no route to arp_ip_target %pI4\n",
2610 bond->dev->name, &targets[i]);
2611 }
2612 continue;
2613 }
2614
2615 /*
2616 * This target is not on a VLAN
2617 */
2618 if (rt->dst.dev == bond->dev) {
2619 ip_rt_put(rt);
2620 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2621 addr = bond_confirm_addr(bond->dev, targets[i], 0);
2622 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2623 addr, 0);
2624 continue;
2625 }
2626
2627 vlan_id = 0;
2628 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2629 rcu_read_lock();
2630 vlan_dev = __vlan_find_dev_deep(bond->dev,
2631 htons(ETH_P_8021Q),
2632 vlan->vlan_id);
2633 rcu_read_unlock();
2634 if (vlan_dev == rt->dst.dev) {
2635 vlan_id = vlan->vlan_id;
2636 pr_debug("basa: vlan match on %s %d\n",
2637 vlan_dev->name, vlan_id);
2638 break;
2639 }
2640 }
2641
2642 if (vlan_id && vlan_dev) {
2643 ip_rt_put(rt);
2644 addr = bond_confirm_addr(vlan_dev, targets[i], 0);
2645 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2646 addr, vlan_id);
2647 continue;
2648 }
2649
2650 if (net_ratelimit()) {
2651 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2652 bond->dev->name, &targets[i],
2653 rt->dst.dev ? rt->dst.dev->name : "NULL");
2654 }
2655 ip_rt_put(rt);
2656 }
2657 }
2658
2659 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2660 {
2661 int i;
2662 __be32 *targets = bond->params.arp_targets;
2663
2664 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2665 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2666 &sip, &tip, i, &targets[i],
2667 bond_has_this_ip(bond, tip));
2668 if (sip == targets[i]) {
2669 if (bond_has_this_ip(bond, tip))
2670 slave->last_arp_rx = jiffies;
2671 return;
2672 }
2673 }
2674 }
2675
2676 static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2677 struct slave *slave)
2678 {
2679 struct arphdr *arp = (struct arphdr *)skb->data;
2680 unsigned char *arp_ptr;
2681 __be32 sip, tip;
2682 int alen;
2683
2684 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2685 return RX_HANDLER_ANOTHER;
2686
2687 read_lock(&bond->lock);
2688 alen = arp_hdr_len(bond->dev);
2689
2690 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2691 bond->dev->name, skb->dev->name);
2692
2693 if (alen > skb_headlen(skb)) {
2694 arp = kmalloc(alen, GFP_ATOMIC);
2695 if (!arp)
2696 goto out_unlock;
2697 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2698 goto out_unlock;
2699 }
2700
2701 if (arp->ar_hln != bond->dev->addr_len ||
2702 skb->pkt_type == PACKET_OTHERHOST ||
2703 skb->pkt_type == PACKET_LOOPBACK ||
2704 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2705 arp->ar_pro != htons(ETH_P_IP) ||
2706 arp->ar_pln != 4)
2707 goto out_unlock;
2708
2709 arp_ptr = (unsigned char *)(arp + 1);
2710 arp_ptr += bond->dev->addr_len;
2711 memcpy(&sip, arp_ptr, 4);
2712 arp_ptr += 4 + bond->dev->addr_len;
2713 memcpy(&tip, arp_ptr, 4);
2714
2715 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2716 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2717 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2718 &sip, &tip);
2719
2720 /*
2721 * Backup slaves won't see the ARP reply, but do come through
2722 * here for each ARP probe (so we swap the sip/tip to validate
2723 * the probe). In a "redundant switch, common router" type of
2724 * configuration, the ARP probe will (hopefully) travel from
2725 * the active, through one switch, the router, then the other
2726 * switch before reaching the backup.
2727 */
2728 if (bond_is_active_slave(slave))
2729 bond_validate_arp(bond, slave, sip, tip);
2730 else
2731 bond_validate_arp(bond, slave, tip, sip);
2732
2733 out_unlock:
2734 read_unlock(&bond->lock);
2735 if (arp != (struct arphdr *)skb->data)
2736 kfree(arp);
2737 return RX_HANDLER_ANOTHER;
2738 }
2739
2740 /*
2741 * this function is called regularly to monitor each slave's link
2742 * ensuring that traffic is being sent and received when arp monitoring
2743 * is used in load-balancing mode. if the adapter has been dormant, then an
2744 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2745 * arp monitoring in active backup mode.
2746 */
2747 void bond_loadbalance_arp_mon(struct work_struct *work)
2748 {
2749 struct bonding *bond = container_of(work, struct bonding,
2750 arp_work.work);
2751 struct slave *slave, *oldcurrent;
2752 int do_failover = 0;
2753 int delta_in_ticks, extra_ticks;
2754 int i;
2755
2756 read_lock(&bond->lock);
2757
2758 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2759 extra_ticks = delta_in_ticks / 2;
2760
2761 if (bond->slave_cnt == 0)
2762 goto re_arm;
2763
2764 read_lock(&bond->curr_slave_lock);
2765 oldcurrent = bond->curr_active_slave;
2766 read_unlock(&bond->curr_slave_lock);
2767
2768 /* see if any of the previous devices are up now (i.e. they have
2769 * xmt and rcv traffic). the curr_active_slave does not come into
2770 * the picture unless it is null. also, slave->jiffies is not needed
2771 * here because we send an arp on each slave and give a slave as
2772 * long as it needs to get the tx/rx within the delta.
2773 * TODO: what about up/down delay in arp mode? it wasn't here before
2774 * so it can wait
2775 */
2776 bond_for_each_slave(bond, slave, i) {
2777 unsigned long trans_start = dev_trans_start(slave->dev);
2778
2779 if (slave->link != BOND_LINK_UP) {
2780 if (time_in_range(jiffies,
2781 trans_start - delta_in_ticks,
2782 trans_start + delta_in_ticks + extra_ticks) &&
2783 time_in_range(jiffies,
2784 slave->dev->last_rx - delta_in_ticks,
2785 slave->dev->last_rx + delta_in_ticks + extra_ticks)) {
2786
2787 slave->link = BOND_LINK_UP;
2788 bond_set_active_slave(slave);
2789
2790 /* primary_slave has no meaning in round-robin
2791 * mode. the window of a slave being up and
2792 * curr_active_slave being null after enslaving
2793 * is closed.
2794 */
2795 if (!oldcurrent) {
2796 pr_info("%s: link status definitely up for interface %s, ",
2797 bond->dev->name,
2798 slave->dev->name);
2799 do_failover = 1;
2800 } else {
2801 pr_info("%s: interface %s is now up\n",
2802 bond->dev->name,
2803 slave->dev->name);
2804 }
2805 }
2806 } else {
2807 /* slave->link == BOND_LINK_UP */
2808
2809 /* not all switches will respond to an arp request
2810 * when the source ip is 0, so don't take the link down
2811 * if we don't know our ip yet
2812 */
2813 if (!time_in_range(jiffies,
2814 trans_start - delta_in_ticks,
2815 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2816 !time_in_range(jiffies,
2817 slave->dev->last_rx - delta_in_ticks,
2818 slave->dev->last_rx + 2 * delta_in_ticks + extra_ticks)) {
2819
2820 slave->link = BOND_LINK_DOWN;
2821 bond_set_backup_slave(slave);
2822
2823 if (slave->link_failure_count < UINT_MAX)
2824 slave->link_failure_count++;
2825
2826 pr_info("%s: interface %s is now down.\n",
2827 bond->dev->name,
2828 slave->dev->name);
2829
2830 if (slave == oldcurrent)
2831 do_failover = 1;
2832 }
2833 }
2834
2835 /* note: if switch is in round-robin mode, all links
2836 * must tx arp to ensure all links rx an arp - otherwise
2837 * links may oscillate or not come up at all; if switch is
2838 * in something like xor mode, there is nothing we can
2839 * do - all replies will be rx'ed on same link causing slaves
2840 * to be unstable during low/no traffic periods
2841 */
2842 if (IS_UP(slave->dev))
2843 bond_arp_send_all(bond, slave);
2844 }
2845
2846 if (do_failover) {
2847 block_netpoll_tx();
2848 write_lock_bh(&bond->curr_slave_lock);
2849
2850 bond_select_active_slave(bond);
2851
2852 write_unlock_bh(&bond->curr_slave_lock);
2853 unblock_netpoll_tx();
2854 }
2855
2856 re_arm:
2857 if (bond->params.arp_interval)
2858 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2859
2860 read_unlock(&bond->lock);
2861 }
2862
2863 /*
2864 * Called to inspect slaves for active-backup mode ARP monitor link state
2865 * changes. Sets new_link in slaves to specify what action should take
2866 * place for the slave. Returns 0 if no changes are found, >0 if changes
2867 * to link states must be committed.
2868 *
2869 * Called with bond->lock held for read.
2870 */
2871 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2872 {
2873 struct slave *slave;
2874 int i, commit = 0;
2875 unsigned long trans_start;
2876 int extra_ticks;
2877
2878 /* All the time comparisons below need some extra time. Otherwise, on
2879 * fast networks the ARP probe/reply may arrive within the same jiffy
2880 * as it was sent. Then, the next time the ARP monitor is run, one
2881 * arp_interval will already have passed in the comparisons.
2882 */
2883 extra_ticks = delta_in_ticks / 2;
2884
2885 bond_for_each_slave(bond, slave, i) {
2886 slave->new_link = BOND_LINK_NOCHANGE;
2887
2888 if (slave->link != BOND_LINK_UP) {
2889 if (time_in_range(jiffies,
2890 slave_last_rx(bond, slave) - delta_in_ticks,
2891 slave_last_rx(bond, slave) + delta_in_ticks + extra_ticks)) {
2892
2893 slave->new_link = BOND_LINK_UP;
2894 commit++;
2895 }
2896
2897 continue;
2898 }
2899
2900 /*
2901 * Give slaves 2*delta after being enslaved or made
2902 * active. This avoids bouncing, as the last receive
2903 * times need a full ARP monitor cycle to be updated.
2904 */
2905 if (time_in_range(jiffies,
2906 slave->jiffies - delta_in_ticks,
2907 slave->jiffies + 2 * delta_in_ticks + extra_ticks))
2908 continue;
2909
2910 /*
2911 * Backup slave is down if:
2912 * - No current_arp_slave AND
2913 * - more than 3*delta since last receive AND
2914 * - the bond has an IP address
2915 *
2916 * Note: a non-null current_arp_slave indicates
2917 * the curr_active_slave went down and we are
2918 * searching for a new one; under this condition
2919 * we only take the curr_active_slave down - this
2920 * gives each slave a chance to tx/rx traffic
2921 * before being taken out
2922 */
2923 if (!bond_is_active_slave(slave) &&
2924 !bond->current_arp_slave &&
2925 !time_in_range(jiffies,
2926 slave_last_rx(bond, slave) - delta_in_ticks,
2927 slave_last_rx(bond, slave) + 3 * delta_in_ticks + extra_ticks)) {
2928
2929 slave->new_link = BOND_LINK_DOWN;
2930 commit++;
2931 }
2932
2933 /*
2934 * Active slave is down if:
2935 * - more than 2*delta since transmitting OR
2936 * - (more than 2*delta since receive AND
2937 * the bond has an IP address)
2938 */
2939 trans_start = dev_trans_start(slave->dev);
2940 if (bond_is_active_slave(slave) &&
2941 (!time_in_range(jiffies,
2942 trans_start - delta_in_ticks,
2943 trans_start + 2 * delta_in_ticks + extra_ticks) ||
2944 !time_in_range(jiffies,
2945 slave_last_rx(bond, slave) - delta_in_ticks,
2946 slave_last_rx(bond, slave) + 2 * delta_in_ticks + extra_ticks))) {
2947
2948 slave->new_link = BOND_LINK_DOWN;
2949 commit++;
2950 }
2951 }
2952
2953 return commit;
2954 }
2955
2956 /*
2957 * Called to commit link state changes noted by inspection step of
2958 * active-backup mode ARP monitor.
2959 *
2960 * Called with RTNL and bond->lock for read.
2961 */
2962 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2963 {
2964 struct slave *slave;
2965 int i;
2966 unsigned long trans_start;
2967
2968 bond_for_each_slave(bond, slave, i) {
2969 switch (slave->new_link) {
2970 case BOND_LINK_NOCHANGE:
2971 continue;
2972
2973 case BOND_LINK_UP:
2974 trans_start = dev_trans_start(slave->dev);
2975 if ((!bond->curr_active_slave &&
2976 time_in_range(jiffies,
2977 trans_start - delta_in_ticks,
2978 trans_start + delta_in_ticks + delta_in_ticks / 2)) ||
2979 bond->curr_active_slave != slave) {
2980 slave->link = BOND_LINK_UP;
2981 if (bond->current_arp_slave) {
2982 bond_set_slave_inactive_flags(
2983 bond->current_arp_slave);
2984 bond->current_arp_slave = NULL;
2985 }
2986
2987 pr_info("%s: link status definitely up for interface %s.\n",
2988 bond->dev->name, slave->dev->name);
2989
2990 if (!bond->curr_active_slave ||
2991 (slave == bond->primary_slave))
2992 goto do_failover;
2993
2994 }
2995
2996 continue;
2997
2998 case BOND_LINK_DOWN:
2999 if (slave->link_failure_count < UINT_MAX)
3000 slave->link_failure_count++;
3001
3002 slave->link = BOND_LINK_DOWN;
3003 bond_set_slave_inactive_flags(slave);
3004
3005 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3006 bond->dev->name, slave->dev->name);
3007
3008 if (slave == bond->curr_active_slave) {
3009 bond->current_arp_slave = NULL;
3010 goto do_failover;
3011 }
3012
3013 continue;
3014
3015 default:
3016 pr_err("%s: impossible: new_link %d on slave %s\n",
3017 bond->dev->name, slave->new_link,
3018 slave->dev->name);
3019 continue;
3020 }
3021
3022 do_failover:
3023 ASSERT_RTNL();
3024 block_netpoll_tx();
3025 write_lock_bh(&bond->curr_slave_lock);
3026 bond_select_active_slave(bond);
3027 write_unlock_bh(&bond->curr_slave_lock);
3028 unblock_netpoll_tx();
3029 }
3030
3031 bond_set_carrier(bond);
3032 }
3033
3034 /*
3035 * Send ARP probes for active-backup mode ARP monitor.
3036 *
3037 * Called with bond->lock held for read.
3038 */
3039 static void bond_ab_arp_probe(struct bonding *bond)
3040 {
3041 struct slave *slave;
3042 int i;
3043
3044 read_lock(&bond->curr_slave_lock);
3045
3046 if (bond->current_arp_slave && bond->curr_active_slave)
3047 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3048 bond->current_arp_slave->dev->name,
3049 bond->curr_active_slave->dev->name);
3050
3051 if (bond->curr_active_slave) {
3052 bond_arp_send_all(bond, bond->curr_active_slave);
3053 read_unlock(&bond->curr_slave_lock);
3054 return;
3055 }
3056
3057 read_unlock(&bond->curr_slave_lock);
3058
3059 /* if we don't have a curr_active_slave, search for the next available
3060 * backup slave from the current_arp_slave and make it the candidate
3061 * for becoming the curr_active_slave
3062 */
3063
3064 if (!bond->current_arp_slave) {
3065 bond->current_arp_slave = bond->first_slave;
3066 if (!bond->current_arp_slave)
3067 return;
3068 }
3069
3070 bond_set_slave_inactive_flags(bond->current_arp_slave);
3071
3072 /* search for next candidate */
3073 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3074 if (IS_UP(slave->dev)) {
3075 slave->link = BOND_LINK_BACK;
3076 bond_set_slave_active_flags(slave);
3077 bond_arp_send_all(bond, slave);
3078 slave->jiffies = jiffies;
3079 bond->current_arp_slave = slave;
3080 break;
3081 }
3082
3083 /* if the link state is up at this point, we
3084 * mark it down - this can happen if we have
3085 * simultaneous link failures and
3086 * reselect_active_interface doesn't make this
3087 * one the current slave so it is still marked
3088 * up when it is actually down
3089 */
3090 if (slave->link == BOND_LINK_UP) {
3091 slave->link = BOND_LINK_DOWN;
3092 if (slave->link_failure_count < UINT_MAX)
3093 slave->link_failure_count++;
3094
3095 bond_set_slave_inactive_flags(slave);
3096
3097 pr_info("%s: backup interface %s is now down.\n",
3098 bond->dev->name, slave->dev->name);
3099 }
3100 }
3101 }
3102
3103 void bond_activebackup_arp_mon(struct work_struct *work)
3104 {
3105 struct bonding *bond = container_of(work, struct bonding,
3106 arp_work.work);
3107 bool should_notify_peers = false;
3108 int delta_in_ticks;
3109
3110 read_lock(&bond->lock);
3111
3112 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3113
3114 if (bond->slave_cnt == 0)
3115 goto re_arm;
3116
3117 should_notify_peers = bond_should_notify_peers(bond);
3118
3119 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3120 read_unlock(&bond->lock);
3121
3122 /* Race avoidance with bond_close flush of workqueue */
3123 if (!rtnl_trylock()) {
3124 read_lock(&bond->lock);
3125 delta_in_ticks = 1;
3126 should_notify_peers = false;
3127 goto re_arm;
3128 }
3129
3130 read_lock(&bond->lock);
3131
3132 bond_ab_arp_commit(bond, delta_in_ticks);
3133
3134 read_unlock(&bond->lock);
3135 rtnl_unlock();
3136 read_lock(&bond->lock);
3137 }
3138
3139 bond_ab_arp_probe(bond);
3140
3141 re_arm:
3142 if (bond->params.arp_interval)
3143 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3144
3145 read_unlock(&bond->lock);
3146
3147 if (should_notify_peers) {
3148 if (!rtnl_trylock()) {
3149 read_lock(&bond->lock);
3150 bond->send_peer_notif++;
3151 read_unlock(&bond->lock);
3152 return;
3153 }
3154 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
3155 rtnl_unlock();
3156 }
3157 }
3158
3159 /*-------------------------- netdev event handling --------------------------*/
3160
3161 /*
3162 * Change device name
3163 */
3164 static int bond_event_changename(struct bonding *bond)
3165 {
3166 bond_remove_proc_entry(bond);
3167 bond_create_proc_entry(bond);
3168
3169 bond_debug_reregister(bond);
3170
3171 return NOTIFY_DONE;
3172 }
3173
3174 static int bond_master_netdev_event(unsigned long event,
3175 struct net_device *bond_dev)
3176 {
3177 struct bonding *event_bond = netdev_priv(bond_dev);
3178
3179 switch (event) {
3180 case NETDEV_CHANGENAME:
3181 return bond_event_changename(event_bond);
3182 case NETDEV_UNREGISTER:
3183 bond_remove_proc_entry(event_bond);
3184 break;
3185 case NETDEV_REGISTER:
3186 bond_create_proc_entry(event_bond);
3187 break;
3188 default:
3189 break;
3190 }
3191
3192 return NOTIFY_DONE;
3193 }
3194
3195 static int bond_slave_netdev_event(unsigned long event,
3196 struct net_device *slave_dev)
3197 {
3198 struct slave *slave = bond_slave_get_rtnl(slave_dev);
3199 struct bonding *bond;
3200 struct net_device *bond_dev;
3201 u32 old_speed;
3202 u8 old_duplex;
3203
3204 /* A netdev event can be generated while enslaving a device
3205 * before netdev_rx_handler_register is called in which case
3206 * slave will be NULL
3207 */
3208 if (!slave)
3209 return NOTIFY_DONE;
3210 bond_dev = slave->bond->dev;
3211 bond = slave->bond;
3212
3213 switch (event) {
3214 case NETDEV_UNREGISTER:
3215 if (bond->setup_by_slave)
3216 bond_release_and_destroy(bond_dev, slave_dev);
3217 else
3218 bond_release(bond_dev, slave_dev);
3219 break;
3220 case NETDEV_UP:
3221 case NETDEV_CHANGE:
3222 old_speed = slave->speed;
3223 old_duplex = slave->duplex;
3224
3225 bond_update_speed_duplex(slave);
3226
3227 if (bond->params.mode == BOND_MODE_8023AD) {
3228 if (old_speed != slave->speed)
3229 bond_3ad_adapter_speed_changed(slave);
3230 if (old_duplex != slave->duplex)
3231 bond_3ad_adapter_duplex_changed(slave);
3232 }
3233 break;
3234 case NETDEV_DOWN:
3235 /*
3236 * ... Or is it this?
3237 */
3238 break;
3239 case NETDEV_CHANGEMTU:
3240 /*
3241 * TODO: Should slaves be allowed to
3242 * independently alter their MTU? For
3243 * an active-backup bond, slaves need
3244 * not be the same type of device, so
3245 * MTUs may vary. For other modes,
3246 * slaves arguably should have the
3247 * same MTUs. To do this, we'd need to
3248 * take over the slave's change_mtu
3249 * function for the duration of their
3250 * servitude.
3251 */
3252 break;
3253 case NETDEV_CHANGENAME:
3254 /*
3255 * TODO: handle changing the primary's name
3256 */
3257 break;
3258 case NETDEV_FEAT_CHANGE:
3259 bond_compute_features(bond);
3260 break;
3261 default:
3262 break;
3263 }
3264
3265 return NOTIFY_DONE;
3266 }
3267
3268 /*
3269 * bond_netdev_event: handle netdev notifier chain events.
3270 *
3271 * This function receives events for the netdev chain. The caller (an
3272 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3273 * locks for us to safely manipulate the slave devices (RTNL lock,
3274 * dev_probe_lock).
3275 */
3276 static int bond_netdev_event(struct notifier_block *this,
3277 unsigned long event, void *ptr)
3278 {
3279 struct net_device *event_dev = (struct net_device *)ptr;
3280
3281 pr_debug("event_dev: %s, event: %lx\n",
3282 event_dev ? event_dev->name : "None",
3283 event);
3284
3285 if (!(event_dev->priv_flags & IFF_BONDING))
3286 return NOTIFY_DONE;
3287
3288 if (event_dev->flags & IFF_MASTER) {
3289 pr_debug("IFF_MASTER\n");
3290 return bond_master_netdev_event(event, event_dev);
3291 }
3292
3293 if (event_dev->flags & IFF_SLAVE) {
3294 pr_debug("IFF_SLAVE\n");
3295 return bond_slave_netdev_event(event, event_dev);
3296 }
3297
3298 return NOTIFY_DONE;
3299 }
3300
3301 static struct notifier_block bond_netdev_notifier = {
3302 .notifier_call = bond_netdev_event,
3303 };
3304
3305 /*---------------------------- Hashing Policies -----------------------------*/
3306
3307 /*
3308 * Hash for the output device based upon layer 2 data
3309 */
3310 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3311 {
3312 struct ethhdr *data = (struct ethhdr *)skb->data;
3313
3314 if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
3315 return (data->h_dest[5] ^ data->h_source[5]) % count;
3316
3317 return 0;
3318 }
3319
3320 /*
3321 * Hash for the output device based upon layer 2 and layer 3 data. If
3322 * the packet is not IP, fall back on bond_xmit_hash_policy_l2()
3323 */
3324 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3325 {
3326 const struct ethhdr *data;
3327 const struct iphdr *iph;
3328 const struct ipv6hdr *ipv6h;
3329 u32 v6hash;
3330 const __be32 *s, *d;
3331
3332 if (skb->protocol == htons(ETH_P_IP) &&
3333 pskb_network_may_pull(skb, sizeof(*iph))) {
3334 iph = ip_hdr(skb);
3335 data = (struct ethhdr *)skb->data;
3336 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3337 (data->h_dest[5] ^ data->h_source[5])) % count;
3338 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3339 pskb_network_may_pull(skb, sizeof(*ipv6h))) {
3340 ipv6h = ipv6_hdr(skb);
3341 data = (struct ethhdr *)skb->data;
3342 s = &ipv6h->saddr.s6_addr32[0];
3343 d = &ipv6h->daddr.s6_addr32[0];
3344 v6hash = (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3345 v6hash ^= (v6hash >> 24) ^ (v6hash >> 16) ^ (v6hash >> 8);
3346 return (v6hash ^ data->h_dest[5] ^ data->h_source[5]) % count;
3347 }
3348
3349 return bond_xmit_hash_policy_l2(skb, count);
3350 }
3351
3352 /*
3353 * Hash for the output device based upon layer 3 and layer 4 data. If
3354 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3355 * altogether not IP, fall back on bond_xmit_hash_policy_l2()
3356 */
3357 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3358 {
3359 u32 layer4_xor = 0;
3360 const struct iphdr *iph;
3361 const struct ipv6hdr *ipv6h;
3362 const __be32 *s, *d;
3363 const __be16 *l4 = NULL;
3364 __be16 _l4[2];
3365 int noff = skb_network_offset(skb);
3366 int poff;
3367
3368 if (skb->protocol == htons(ETH_P_IP) &&
3369 pskb_may_pull(skb, noff + sizeof(*iph))) {
3370 iph = ip_hdr(skb);
3371 poff = proto_ports_offset(iph->protocol);
3372
3373 if (!ip_is_fragment(iph) && poff >= 0) {
3374 l4 = skb_header_pointer(skb, noff + (iph->ihl << 2) + poff,
3375 sizeof(_l4), &_l4);
3376 if (l4)
3377 layer4_xor = ntohs(l4[0] ^ l4[1]);
3378 }
3379 return (layer4_xor ^
3380 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3381 } else if (skb->protocol == htons(ETH_P_IPV6) &&
3382 pskb_may_pull(skb, noff + sizeof(*ipv6h))) {
3383 ipv6h = ipv6_hdr(skb);
3384 poff = proto_ports_offset(ipv6h->nexthdr);
3385 if (poff >= 0) {
3386 l4 = skb_header_pointer(skb, noff + sizeof(*ipv6h) + poff,
3387 sizeof(_l4), &_l4);
3388 if (l4)
3389 layer4_xor = ntohs(l4[0] ^ l4[1]);
3390 }
3391 s = &ipv6h->saddr.s6_addr32[0];
3392 d = &ipv6h->daddr.s6_addr32[0];
3393 layer4_xor ^= (s[1] ^ d[1]) ^ (s[2] ^ d[2]) ^ (s[3] ^ d[3]);
3394 layer4_xor ^= (layer4_xor >> 24) ^ (layer4_xor >> 16) ^
3395 (layer4_xor >> 8);
3396 return layer4_xor % count;
3397 }
3398
3399 return bond_xmit_hash_policy_l2(skb, count);
3400 }
3401
3402 /*-------------------------- Device entry points ----------------------------*/
3403
3404 static void bond_work_init_all(struct bonding *bond)
3405 {
3406 INIT_DELAYED_WORK(&bond->mcast_work,
3407 bond_resend_igmp_join_requests_delayed);
3408 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3409 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3410 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3411 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3412 else
3413 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3414 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3415 }
3416
3417 static void bond_work_cancel_all(struct bonding *bond)
3418 {
3419 cancel_delayed_work_sync(&bond->mii_work);
3420 cancel_delayed_work_sync(&bond->arp_work);
3421 cancel_delayed_work_sync(&bond->alb_work);
3422 cancel_delayed_work_sync(&bond->ad_work);
3423 cancel_delayed_work_sync(&bond->mcast_work);
3424 }
3425
3426 static int bond_open(struct net_device *bond_dev)
3427 {
3428 struct bonding *bond = netdev_priv(bond_dev);
3429 struct slave *slave;
3430 int i;
3431
3432 /* reset slave->backup and slave->inactive */
3433 read_lock(&bond->lock);
3434 if (bond->slave_cnt > 0) {
3435 read_lock(&bond->curr_slave_lock);
3436 bond_for_each_slave(bond, slave, i) {
3437 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3438 && (slave != bond->curr_active_slave)) {
3439 bond_set_slave_inactive_flags(slave);
3440 } else {
3441 bond_set_slave_active_flags(slave);
3442 }
3443 }
3444 read_unlock(&bond->curr_slave_lock);
3445 }
3446 read_unlock(&bond->lock);
3447
3448 bond_work_init_all(bond);
3449
3450 if (bond_is_lb(bond)) {
3451 /* bond_alb_initialize must be called before the timer
3452 * is started.
3453 */
3454 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB)))
3455 return -ENOMEM;
3456 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3457 }
3458
3459 if (bond->params.miimon) /* link check interval, in milliseconds. */
3460 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3461
3462 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3463 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3464 if (bond->params.arp_validate)
3465 bond->recv_probe = bond_arp_rcv;
3466 }
3467
3468 if (bond->params.mode == BOND_MODE_8023AD) {
3469 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3470 /* register to receive LACPDUs */
3471 bond->recv_probe = bond_3ad_lacpdu_recv;
3472 bond_3ad_initiate_agg_selection(bond, 1);
3473 }
3474
3475 return 0;
3476 }
3477
3478 static int bond_close(struct net_device *bond_dev)
3479 {
3480 struct bonding *bond = netdev_priv(bond_dev);
3481
3482 write_lock_bh(&bond->lock);
3483 bond->send_peer_notif = 0;
3484 write_unlock_bh(&bond->lock);
3485
3486 bond_work_cancel_all(bond);
3487 if (bond_is_lb(bond)) {
3488 /* Must be called only after all
3489 * slaves have been released
3490 */
3491 bond_alb_deinitialize(bond);
3492 }
3493 bond->recv_probe = NULL;
3494
3495 return 0;
3496 }
3497
3498 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3499 struct rtnl_link_stats64 *stats)
3500 {
3501 struct bonding *bond = netdev_priv(bond_dev);
3502 struct rtnl_link_stats64 temp;
3503 struct slave *slave;
3504 int i;
3505
3506 memset(stats, 0, sizeof(*stats));
3507
3508 read_lock_bh(&bond->lock);
3509
3510 bond_for_each_slave(bond, slave, i) {
3511 const struct rtnl_link_stats64 *sstats =
3512 dev_get_stats(slave->dev, &temp);
3513
3514 stats->rx_packets += sstats->rx_packets;
3515 stats->rx_bytes += sstats->rx_bytes;
3516 stats->rx_errors += sstats->rx_errors;
3517 stats->rx_dropped += sstats->rx_dropped;
3518
3519 stats->tx_packets += sstats->tx_packets;
3520 stats->tx_bytes += sstats->tx_bytes;
3521 stats->tx_errors += sstats->tx_errors;
3522 stats->tx_dropped += sstats->tx_dropped;
3523
3524 stats->multicast += sstats->multicast;
3525 stats->collisions += sstats->collisions;
3526
3527 stats->rx_length_errors += sstats->rx_length_errors;
3528 stats->rx_over_errors += sstats->rx_over_errors;
3529 stats->rx_crc_errors += sstats->rx_crc_errors;
3530 stats->rx_frame_errors += sstats->rx_frame_errors;
3531 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3532 stats->rx_missed_errors += sstats->rx_missed_errors;
3533
3534 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3535 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3536 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3537 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3538 stats->tx_window_errors += sstats->tx_window_errors;
3539 }
3540
3541 read_unlock_bh(&bond->lock);
3542
3543 return stats;
3544 }
3545
3546 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3547 {
3548 struct net_device *slave_dev = NULL;
3549 struct ifbond k_binfo;
3550 struct ifbond __user *u_binfo = NULL;
3551 struct ifslave k_sinfo;
3552 struct ifslave __user *u_sinfo = NULL;
3553 struct mii_ioctl_data *mii = NULL;
3554 struct net *net;
3555 int res = 0;
3556
3557 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3558
3559 switch (cmd) {
3560 case SIOCGMIIPHY:
3561 mii = if_mii(ifr);
3562 if (!mii)
3563 return -EINVAL;
3564
3565 mii->phy_id = 0;
3566 /* Fall Through */
3567 case SIOCGMIIREG:
3568 /*
3569 * We do this again just in case we were called by SIOCGMIIREG
3570 * instead of SIOCGMIIPHY.
3571 */
3572 mii = if_mii(ifr);
3573 if (!mii)
3574 return -EINVAL;
3575
3576
3577 if (mii->reg_num == 1) {
3578 struct bonding *bond = netdev_priv(bond_dev);
3579 mii->val_out = 0;
3580 read_lock(&bond->lock);
3581 read_lock(&bond->curr_slave_lock);
3582 if (netif_carrier_ok(bond->dev))
3583 mii->val_out = BMSR_LSTATUS;
3584
3585 read_unlock(&bond->curr_slave_lock);
3586 read_unlock(&bond->lock);
3587 }
3588
3589 return 0;
3590 case BOND_INFO_QUERY_OLD:
3591 case SIOCBONDINFOQUERY:
3592 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3593
3594 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3595 return -EFAULT;
3596
3597 res = bond_info_query(bond_dev, &k_binfo);
3598 if (res == 0 &&
3599 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3600 return -EFAULT;
3601
3602 return res;
3603 case BOND_SLAVE_INFO_QUERY_OLD:
3604 case SIOCBONDSLAVEINFOQUERY:
3605 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3606
3607 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3608 return -EFAULT;
3609
3610 res = bond_slave_info_query(bond_dev, &k_sinfo);
3611 if (res == 0 &&
3612 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3613 return -EFAULT;
3614
3615 return res;
3616 default:
3617 /* Go on */
3618 break;
3619 }
3620
3621 net = dev_net(bond_dev);
3622
3623 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3624 return -EPERM;
3625
3626 slave_dev = dev_get_by_name(net, ifr->ifr_slave);
3627
3628 pr_debug("slave_dev=%p:\n", slave_dev);
3629
3630 if (!slave_dev)
3631 res = -ENODEV;
3632 else {
3633 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3634 switch (cmd) {
3635 case BOND_ENSLAVE_OLD:
3636 case SIOCBONDENSLAVE:
3637 res = bond_enslave(bond_dev, slave_dev);
3638 break;
3639 case BOND_RELEASE_OLD:
3640 case SIOCBONDRELEASE:
3641 res = bond_release(bond_dev, slave_dev);
3642 break;
3643 case BOND_SETHWADDR_OLD:
3644 case SIOCBONDSETHWADDR:
3645 bond_set_dev_addr(bond_dev, slave_dev);
3646 res = 0;
3647 break;
3648 case BOND_CHANGE_ACTIVE_OLD:
3649 case SIOCBONDCHANGEACTIVE:
3650 res = bond_ioctl_change_active(bond_dev, slave_dev);
3651 break;
3652 default:
3653 res = -EOPNOTSUPP;
3654 }
3655
3656 dev_put(slave_dev);
3657 }
3658
3659 return res;
3660 }
3661
3662 static bool bond_addr_in_mc_list(unsigned char *addr,
3663 struct netdev_hw_addr_list *list,
3664 int addrlen)
3665 {
3666 struct netdev_hw_addr *ha;
3667
3668 netdev_hw_addr_list_for_each(ha, list)
3669 if (!memcmp(ha->addr, addr, addrlen))
3670 return true;
3671
3672 return false;
3673 }
3674
3675 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3676 {
3677 struct bonding *bond = netdev_priv(bond_dev);
3678
3679 if (change & IFF_PROMISC)
3680 bond_set_promiscuity(bond,
3681 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3682
3683 if (change & IFF_ALLMULTI)
3684 bond_set_allmulti(bond,
3685 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3686 }
3687
3688 static void bond_set_multicast_list(struct net_device *bond_dev)
3689 {
3690 struct bonding *bond = netdev_priv(bond_dev);
3691 struct netdev_hw_addr *ha;
3692 bool found;
3693
3694 read_lock(&bond->lock);
3695
3696 /* looking for addresses to add to slaves' mc list */
3697 netdev_for_each_mc_addr(ha, bond_dev) {
3698 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3699 bond_dev->addr_len);
3700 if (!found)
3701 bond_mc_add(bond, ha->addr);
3702 }
3703
3704 /* looking for addresses to delete from slaves' list */
3705 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3706 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3707 bond_dev->addr_len);
3708 if (!found)
3709 bond_mc_del(bond, ha->addr);
3710 }
3711
3712 /* save master's multicast list */
3713 __hw_addr_flush(&bond->mc_list);
3714 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3715 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3716
3717 read_unlock(&bond->lock);
3718 }
3719
3720 static int bond_neigh_init(struct neighbour *n)
3721 {
3722 struct bonding *bond = netdev_priv(n->dev);
3723 struct slave *slave = bond->first_slave;
3724 const struct net_device_ops *slave_ops;
3725 struct neigh_parms parms;
3726 int ret;
3727
3728 if (!slave)
3729 return 0;
3730
3731 slave_ops = slave->dev->netdev_ops;
3732
3733 if (!slave_ops->ndo_neigh_setup)
3734 return 0;
3735
3736 parms.neigh_setup = NULL;
3737 parms.neigh_cleanup = NULL;
3738 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3739 if (ret)
3740 return ret;
3741
3742 /*
3743 * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3744 * after the last slave has been detached. Assumes that all slaves
3745 * utilize the same neigh_cleanup (true at this writing as only user
3746 * is ipoib).
3747 */
3748 n->parms->neigh_cleanup = parms.neigh_cleanup;
3749
3750 if (!parms.neigh_setup)
3751 return 0;
3752
3753 return parms.neigh_setup(n);
3754 }
3755
3756 /*
3757 * The bonding ndo_neigh_setup is called at init time beofre any
3758 * slave exists. So we must declare proxy setup function which will
3759 * be used at run time to resolve the actual slave neigh param setup.
3760 */
3761 static int bond_neigh_setup(struct net_device *dev,
3762 struct neigh_parms *parms)
3763 {
3764 parms->neigh_setup = bond_neigh_init;
3765
3766 return 0;
3767 }
3768
3769 /*
3770 * Change the MTU of all of a master's slaves to match the master
3771 */
3772 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3773 {
3774 struct bonding *bond = netdev_priv(bond_dev);
3775 struct slave *slave, *stop_at;
3776 int res = 0;
3777 int i;
3778
3779 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3780 (bond_dev ? bond_dev->name : "None"), new_mtu);
3781
3782 /* Can't hold bond->lock with bh disabled here since
3783 * some base drivers panic. On the other hand we can't
3784 * hold bond->lock without bh disabled because we'll
3785 * deadlock. The only solution is to rely on the fact
3786 * that we're under rtnl_lock here, and the slaves
3787 * list won't change. This doesn't solve the problem
3788 * of setting the slave's MTU while it is
3789 * transmitting, but the assumption is that the base
3790 * driver can handle that.
3791 *
3792 * TODO: figure out a way to safely iterate the slaves
3793 * list, but without holding a lock around the actual
3794 * call to the base driver.
3795 */
3796
3797 bond_for_each_slave(bond, slave, i) {
3798 pr_debug("s %p s->p %p c_m %p\n",
3799 slave,
3800 slave->prev,
3801 slave->dev->netdev_ops->ndo_change_mtu);
3802
3803 res = dev_set_mtu(slave->dev, new_mtu);
3804
3805 if (res) {
3806 /* If we failed to set the slave's mtu to the new value
3807 * we must abort the operation even in ACTIVE_BACKUP
3808 * mode, because if we allow the backup slaves to have
3809 * different mtu values than the active slave we'll
3810 * need to change their mtu when doing a failover. That
3811 * means changing their mtu from timer context, which
3812 * is probably not a good idea.
3813 */
3814 pr_debug("err %d %s\n", res, slave->dev->name);
3815 goto unwind;
3816 }
3817 }
3818
3819 bond_dev->mtu = new_mtu;
3820
3821 return 0;
3822
3823 unwind:
3824 /* unwind from head to the slave that failed */
3825 stop_at = slave;
3826 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3827 int tmp_res;
3828
3829 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3830 if (tmp_res) {
3831 pr_debug("unwind err %d dev %s\n",
3832 tmp_res, slave->dev->name);
3833 }
3834 }
3835
3836 return res;
3837 }
3838
3839 /*
3840 * Change HW address
3841 *
3842 * Note that many devices must be down to change the HW address, and
3843 * downing the master releases all slaves. We can make bonds full of
3844 * bonding devices to test this, however.
3845 */
3846 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3847 {
3848 struct bonding *bond = netdev_priv(bond_dev);
3849 struct sockaddr *sa = addr, tmp_sa;
3850 struct slave *slave, *stop_at;
3851 int res = 0;
3852 int i;
3853
3854 if (bond->params.mode == BOND_MODE_ALB)
3855 return bond_alb_set_mac_address(bond_dev, addr);
3856
3857
3858 pr_debug("bond=%p, name=%s\n",
3859 bond, bond_dev ? bond_dev->name : "None");
3860
3861 /*
3862 * If fail_over_mac is set to active, do nothing and return
3863 * success. Returning an error causes ifenslave to fail.
3864 */
3865 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3866 return 0;
3867
3868 if (!is_valid_ether_addr(sa->sa_data))
3869 return -EADDRNOTAVAIL;
3870
3871 /* Can't hold bond->lock with bh disabled here since
3872 * some base drivers panic. On the other hand we can't
3873 * hold bond->lock without bh disabled because we'll
3874 * deadlock. The only solution is to rely on the fact
3875 * that we're under rtnl_lock here, and the slaves
3876 * list won't change. This doesn't solve the problem
3877 * of setting the slave's hw address while it is
3878 * transmitting, but the assumption is that the base
3879 * driver can handle that.
3880 *
3881 * TODO: figure out a way to safely iterate the slaves
3882 * list, but without holding a lock around the actual
3883 * call to the base driver.
3884 */
3885
3886 bond_for_each_slave(bond, slave, i) {
3887 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3888 pr_debug("slave %p %s\n", slave, slave->dev->name);
3889
3890 if (slave_ops->ndo_set_mac_address == NULL) {
3891 res = -EOPNOTSUPP;
3892 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3893 goto unwind;
3894 }
3895
3896 res = dev_set_mac_address(slave->dev, addr);
3897 if (res) {
3898 /* TODO: consider downing the slave
3899 * and retry ?
3900 * User should expect communications
3901 * breakage anyway until ARP finish
3902 * updating, so...
3903 */
3904 pr_debug("err %d %s\n", res, slave->dev->name);
3905 goto unwind;
3906 }
3907 }
3908
3909 /* success */
3910 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3911 return 0;
3912
3913 unwind:
3914 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3915 tmp_sa.sa_family = bond_dev->type;
3916
3917 /* unwind from head to the slave that failed */
3918 stop_at = slave;
3919 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3920 int tmp_res;
3921
3922 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3923 if (tmp_res) {
3924 pr_debug("unwind err %d dev %s\n",
3925 tmp_res, slave->dev->name);
3926 }
3927 }
3928
3929 return res;
3930 }
3931
3932 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3933 {
3934 struct bonding *bond = netdev_priv(bond_dev);
3935 struct slave *slave, *start_at;
3936 int i, slave_no, res = 1;
3937 struct iphdr *iph = ip_hdr(skb);
3938
3939 /*
3940 * Start with the curr_active_slave that joined the bond as the
3941 * default for sending IGMP traffic. For failover purposes one
3942 * needs to maintain some consistency for the interface that will
3943 * send the join/membership reports. The curr_active_slave found
3944 * will send all of this type of traffic.
3945 */
3946 if ((iph->protocol == IPPROTO_IGMP) &&
3947 (skb->protocol == htons(ETH_P_IP))) {
3948
3949 read_lock(&bond->curr_slave_lock);
3950 slave = bond->curr_active_slave;
3951 read_unlock(&bond->curr_slave_lock);
3952
3953 if (!slave)
3954 goto out;
3955 } else {
3956 /*
3957 * Concurrent TX may collide on rr_tx_counter; we accept
3958 * that as being rare enough not to justify using an
3959 * atomic op here.
3960 */
3961 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3962
3963 bond_for_each_slave(bond, slave, i) {
3964 slave_no--;
3965 if (slave_no < 0)
3966 break;
3967 }
3968 }
3969
3970 start_at = slave;
3971 bond_for_each_slave_from(bond, slave, i, start_at) {
3972 if (IS_UP(slave->dev) &&
3973 (slave->link == BOND_LINK_UP) &&
3974 bond_is_active_slave(slave)) {
3975 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3976 break;
3977 }
3978 }
3979
3980 out:
3981 if (res) {
3982 /* no suitable interface, frame not sent */
3983 kfree_skb(skb);
3984 }
3985
3986 return NETDEV_TX_OK;
3987 }
3988
3989
3990 /*
3991 * in active-backup mode, we know that bond->curr_active_slave is always valid if
3992 * the bond has a usable interface.
3993 */
3994 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3995 {
3996 struct bonding *bond = netdev_priv(bond_dev);
3997 int res = 1;
3998
3999 read_lock(&bond->curr_slave_lock);
4000
4001 if (bond->curr_active_slave)
4002 res = bond_dev_queue_xmit(bond, skb,
4003 bond->curr_active_slave->dev);
4004
4005 read_unlock(&bond->curr_slave_lock);
4006
4007 if (res)
4008 /* no suitable interface, frame not sent */
4009 kfree_skb(skb);
4010
4011 return NETDEV_TX_OK;
4012 }
4013
4014 /*
4015 * In bond_xmit_xor() , we determine the output device by using a pre-
4016 * determined xmit_hash_policy(), If the selected device is not enabled,
4017 * find the next active slave.
4018 */
4019 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4020 {
4021 struct bonding *bond = netdev_priv(bond_dev);
4022 struct slave *slave, *start_at;
4023 int slave_no;
4024 int i;
4025 int res = 1;
4026
4027 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4028
4029 bond_for_each_slave(bond, slave, i) {
4030 slave_no--;
4031 if (slave_no < 0)
4032 break;
4033 }
4034
4035 start_at = slave;
4036
4037 bond_for_each_slave_from(bond, slave, i, start_at) {
4038 if (IS_UP(slave->dev) &&
4039 (slave->link == BOND_LINK_UP) &&
4040 bond_is_active_slave(slave)) {
4041 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4042 break;
4043 }
4044 }
4045
4046 if (res) {
4047 /* no suitable interface, frame not sent */
4048 kfree_skb(skb);
4049 }
4050
4051 return NETDEV_TX_OK;
4052 }
4053
4054 /*
4055 * in broadcast mode, we send everything to all usable interfaces.
4056 */
4057 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4058 {
4059 struct bonding *bond = netdev_priv(bond_dev);
4060 struct slave *slave, *start_at;
4061 struct net_device *tx_dev = NULL;
4062 int i;
4063 int res = 1;
4064
4065 read_lock(&bond->curr_slave_lock);
4066 start_at = bond->curr_active_slave;
4067 read_unlock(&bond->curr_slave_lock);
4068
4069 if (!start_at)
4070 goto out;
4071
4072 bond_for_each_slave_from(bond, slave, i, start_at) {
4073 if (IS_UP(slave->dev) &&
4074 (slave->link == BOND_LINK_UP) &&
4075 bond_is_active_slave(slave)) {
4076 if (tx_dev) {
4077 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4078 if (!skb2) {
4079 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4080 bond_dev->name);
4081 continue;
4082 }
4083
4084 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4085 if (res) {
4086 kfree_skb(skb2);
4087 continue;
4088 }
4089 }
4090 tx_dev = slave->dev;
4091 }
4092 }
4093
4094 if (tx_dev)
4095 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4096
4097 out:
4098 if (res)
4099 /* no suitable interface, frame not sent */
4100 kfree_skb(skb);
4101
4102 /* frame sent to all suitable interfaces */
4103 return NETDEV_TX_OK;
4104 }
4105
4106 /*------------------------- Device initialization ---------------------------*/
4107
4108 static void bond_set_xmit_hash_policy(struct bonding *bond)
4109 {
4110 switch (bond->params.xmit_policy) {
4111 case BOND_XMIT_POLICY_LAYER23:
4112 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4113 break;
4114 case BOND_XMIT_POLICY_LAYER34:
4115 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4116 break;
4117 case BOND_XMIT_POLICY_LAYER2:
4118 default:
4119 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4120 break;
4121 }
4122 }
4123
4124 /*
4125 * Lookup the slave that corresponds to a qid
4126 */
4127 static inline int bond_slave_override(struct bonding *bond,
4128 struct sk_buff *skb)
4129 {
4130 int i, res = 1;
4131 struct slave *slave = NULL;
4132 struct slave *check_slave;
4133
4134 if (!skb->queue_mapping)
4135 return 1;
4136
4137 /* Find out if any slaves have the same mapping as this skb. */
4138 bond_for_each_slave(bond, check_slave, i) {
4139 if (check_slave->queue_id == skb->queue_mapping) {
4140 slave = check_slave;
4141 break;
4142 }
4143 }
4144
4145 /* If the slave isn't UP, use default transmit policy. */
4146 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4147 (slave->link == BOND_LINK_UP)) {
4148 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4149 }
4150
4151 return res;
4152 }
4153
4154
4155 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4156 {
4157 /*
4158 * This helper function exists to help dev_pick_tx get the correct
4159 * destination queue. Using a helper function skips a call to
4160 * skb_tx_hash and will put the skbs in the queue we expect on their
4161 * way down to the bonding driver.
4162 */
4163 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4164
4165 /*
4166 * Save the original txq to restore before passing to the driver
4167 */
4168 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
4169
4170 if (unlikely(txq >= dev->real_num_tx_queues)) {
4171 do {
4172 txq -= dev->real_num_tx_queues;
4173 } while (txq >= dev->real_num_tx_queues);
4174 }
4175 return txq;
4176 }
4177
4178 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4179 {
4180 struct bonding *bond = netdev_priv(dev);
4181
4182 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4183 if (!bond_slave_override(bond, skb))
4184 return NETDEV_TX_OK;
4185 }
4186
4187 switch (bond->params.mode) {
4188 case BOND_MODE_ROUNDROBIN:
4189 return bond_xmit_roundrobin(skb, dev);
4190 case BOND_MODE_ACTIVEBACKUP:
4191 return bond_xmit_activebackup(skb, dev);
4192 case BOND_MODE_XOR:
4193 return bond_xmit_xor(skb, dev);
4194 case BOND_MODE_BROADCAST:
4195 return bond_xmit_broadcast(skb, dev);
4196 case BOND_MODE_8023AD:
4197 return bond_3ad_xmit_xor(skb, dev);
4198 case BOND_MODE_ALB:
4199 case BOND_MODE_TLB:
4200 return bond_alb_xmit(skb, dev);
4201 default:
4202 /* Should never happen, mode already checked */
4203 pr_err("%s: Error: Unknown bonding mode %d\n",
4204 dev->name, bond->params.mode);
4205 WARN_ON_ONCE(1);
4206 kfree_skb(skb);
4207 return NETDEV_TX_OK;
4208 }
4209 }
4210
4211 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4212 {
4213 struct bonding *bond = netdev_priv(dev);
4214 netdev_tx_t ret = NETDEV_TX_OK;
4215
4216 /*
4217 * If we risk deadlock from transmitting this in the
4218 * netpoll path, tell netpoll to queue the frame for later tx
4219 */
4220 if (is_netpoll_tx_blocked(dev))
4221 return NETDEV_TX_BUSY;
4222
4223 read_lock(&bond->lock);
4224
4225 if (bond->slave_cnt)
4226 ret = __bond_start_xmit(skb, dev);
4227 else
4228 kfree_skb(skb);
4229
4230 read_unlock(&bond->lock);
4231
4232 return ret;
4233 }
4234
4235 /*
4236 * set bond mode specific net device operations
4237 */
4238 void bond_set_mode_ops(struct bonding *bond, int mode)
4239 {
4240 struct net_device *bond_dev = bond->dev;
4241
4242 switch (mode) {
4243 case BOND_MODE_ROUNDROBIN:
4244 break;
4245 case BOND_MODE_ACTIVEBACKUP:
4246 break;
4247 case BOND_MODE_XOR:
4248 bond_set_xmit_hash_policy(bond);
4249 break;
4250 case BOND_MODE_BROADCAST:
4251 break;
4252 case BOND_MODE_8023AD:
4253 bond_set_xmit_hash_policy(bond);
4254 break;
4255 case BOND_MODE_ALB:
4256 /* FALLTHRU */
4257 case BOND_MODE_TLB:
4258 break;
4259 default:
4260 /* Should never happen, mode already checked */
4261 pr_err("%s: Error: Unknown bonding mode %d\n",
4262 bond_dev->name, mode);
4263 break;
4264 }
4265 }
4266
4267 static int bond_ethtool_get_settings(struct net_device *bond_dev,
4268 struct ethtool_cmd *ecmd)
4269 {
4270 struct bonding *bond = netdev_priv(bond_dev);
4271 struct slave *slave;
4272 int i;
4273 unsigned long speed = 0;
4274
4275 ecmd->duplex = DUPLEX_UNKNOWN;
4276 ecmd->port = PORT_OTHER;
4277
4278 /* Since SLAVE_IS_OK returns false for all inactive or down slaves, we
4279 * do not need to check mode. Though link speed might not represent
4280 * the true receive or transmit bandwidth (not all modes are symmetric)
4281 * this is an accurate maximum.
4282 */
4283 read_lock(&bond->lock);
4284 bond_for_each_slave(bond, slave, i) {
4285 if (SLAVE_IS_OK(slave)) {
4286 if (slave->speed != SPEED_UNKNOWN)
4287 speed += slave->speed;
4288 if (ecmd->duplex == DUPLEX_UNKNOWN &&
4289 slave->duplex != DUPLEX_UNKNOWN)
4290 ecmd->duplex = slave->duplex;
4291 }
4292 }
4293 ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
4294 read_unlock(&bond->lock);
4295 return 0;
4296 }
4297
4298 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4299 struct ethtool_drvinfo *drvinfo)
4300 {
4301 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4302 strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
4303 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4304 BOND_ABI_VERSION);
4305 }
4306
4307 static const struct ethtool_ops bond_ethtool_ops = {
4308 .get_drvinfo = bond_ethtool_get_drvinfo,
4309 .get_settings = bond_ethtool_get_settings,
4310 .get_link = ethtool_op_get_link,
4311 };
4312
4313 static const struct net_device_ops bond_netdev_ops = {
4314 .ndo_init = bond_init,
4315 .ndo_uninit = bond_uninit,
4316 .ndo_open = bond_open,
4317 .ndo_stop = bond_close,
4318 .ndo_start_xmit = bond_start_xmit,
4319 .ndo_select_queue = bond_select_queue,
4320 .ndo_get_stats64 = bond_get_stats,
4321 .ndo_do_ioctl = bond_do_ioctl,
4322 .ndo_change_rx_flags = bond_change_rx_flags,
4323 .ndo_set_rx_mode = bond_set_multicast_list,
4324 .ndo_change_mtu = bond_change_mtu,
4325 .ndo_set_mac_address = bond_set_mac_address,
4326 .ndo_neigh_setup = bond_neigh_setup,
4327 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4328 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4329 #ifdef CONFIG_NET_POLL_CONTROLLER
4330 .ndo_netpoll_setup = bond_netpoll_setup,
4331 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4332 .ndo_poll_controller = bond_poll_controller,
4333 #endif
4334 .ndo_add_slave = bond_enslave,
4335 .ndo_del_slave = bond_release,
4336 .ndo_fix_features = bond_fix_features,
4337 };
4338
4339 static const struct device_type bond_type = {
4340 .name = "bond",
4341 };
4342
4343 static void bond_destructor(struct net_device *bond_dev)
4344 {
4345 struct bonding *bond = netdev_priv(bond_dev);
4346 if (bond->wq)
4347 destroy_workqueue(bond->wq);
4348 free_netdev(bond_dev);
4349 }
4350
4351 static void bond_setup(struct net_device *bond_dev)
4352 {
4353 struct bonding *bond = netdev_priv(bond_dev);
4354
4355 /* initialize rwlocks */
4356 rwlock_init(&bond->lock);
4357 rwlock_init(&bond->curr_slave_lock);
4358
4359 bond->params = bonding_defaults;
4360
4361 /* Initialize pointers */
4362 bond->dev = bond_dev;
4363 INIT_LIST_HEAD(&bond->vlan_list);
4364
4365 /* Initialize the device entry points */
4366 ether_setup(bond_dev);
4367 bond_dev->netdev_ops = &bond_netdev_ops;
4368 bond_dev->ethtool_ops = &bond_ethtool_ops;
4369 bond_set_mode_ops(bond, bond->params.mode);
4370
4371 bond_dev->destructor = bond_destructor;
4372
4373 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4374
4375 /* Initialize the device options */
4376 bond_dev->tx_queue_len = 0;
4377 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4378 bond_dev->priv_flags |= IFF_BONDING;
4379 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4380
4381 /* At first, we block adding VLANs. That's the only way to
4382 * prevent problems that occur when adding VLANs over an
4383 * empty bond. The block will be removed once non-challenged
4384 * slaves are enslaved.
4385 */
4386 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4387
4388 /* don't acquire bond device's netif_tx_lock when
4389 * transmitting */
4390 bond_dev->features |= NETIF_F_LLTX;
4391
4392 /* By default, we declare the bond to be fully
4393 * VLAN hardware accelerated capable. Special
4394 * care is taken in the various xmit functions
4395 * when there are slaves that are not hw accel
4396 * capable
4397 */
4398
4399 bond_dev->hw_features = BOND_VLAN_FEATURES |
4400 NETIF_F_HW_VLAN_CTAG_TX |
4401 NETIF_F_HW_VLAN_CTAG_RX |
4402 NETIF_F_HW_VLAN_CTAG_FILTER;
4403
4404 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
4405 bond_dev->features |= bond_dev->hw_features;
4406 }
4407
4408 /*
4409 * Destroy a bonding device.
4410 * Must be under rtnl_lock when this function is called.
4411 */
4412 static void bond_uninit(struct net_device *bond_dev)
4413 {
4414 struct bonding *bond = netdev_priv(bond_dev);
4415 struct vlan_entry *vlan, *tmp;
4416
4417 bond_netpoll_cleanup(bond_dev);
4418
4419 /* Release the bonded slaves */
4420 while (bond->first_slave != NULL)
4421 __bond_release_one(bond_dev, bond->first_slave->dev, true);
4422 pr_info("%s: released all slaves\n", bond_dev->name);
4423
4424 list_del(&bond->bond_list);
4425
4426 bond_debug_unregister(bond);
4427
4428 __hw_addr_flush(&bond->mc_list);
4429
4430 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4431 list_del(&vlan->vlan_list);
4432 kfree(vlan);
4433 }
4434 }
4435
4436 /*------------------------- Module initialization ---------------------------*/
4437
4438 /*
4439 * Convert string input module parms. Accept either the
4440 * number of the mode or its string name. A bit complicated because
4441 * some mode names are substrings of other names, and calls from sysfs
4442 * may have whitespace in the name (trailing newlines, for example).
4443 */
4444 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4445 {
4446 int modeint = -1, i, rv;
4447 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4448
4449 for (p = (char *)buf; *p; p++)
4450 if (!(isdigit(*p) || isspace(*p)))
4451 break;
4452
4453 if (*p)
4454 rv = sscanf(buf, "%20s", modestr);
4455 else
4456 rv = sscanf(buf, "%d", &modeint);
4457
4458 if (!rv)
4459 return -1;
4460
4461 for (i = 0; tbl[i].modename; i++) {
4462 if (modeint == tbl[i].mode)
4463 return tbl[i].mode;
4464 if (strcmp(modestr, tbl[i].modename) == 0)
4465 return tbl[i].mode;
4466 }
4467
4468 return -1;
4469 }
4470
4471 static int bond_check_params(struct bond_params *params)
4472 {
4473 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4474
4475 /*
4476 * Convert string parameters.
4477 */
4478 if (mode) {
4479 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4480 if (bond_mode == -1) {
4481 pr_err("Error: Invalid bonding mode \"%s\"\n",
4482 mode == NULL ? "NULL" : mode);
4483 return -EINVAL;
4484 }
4485 }
4486
4487 if (xmit_hash_policy) {
4488 if ((bond_mode != BOND_MODE_XOR) &&
4489 (bond_mode != BOND_MODE_8023AD)) {
4490 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4491 bond_mode_name(bond_mode));
4492 } else {
4493 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4494 xmit_hashtype_tbl);
4495 if (xmit_hashtype == -1) {
4496 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4497 xmit_hash_policy == NULL ? "NULL" :
4498 xmit_hash_policy);
4499 return -EINVAL;
4500 }
4501 }
4502 }
4503
4504 if (lacp_rate) {
4505 if (bond_mode != BOND_MODE_8023AD) {
4506 pr_info("lacp_rate param is irrelevant in mode %s\n",
4507 bond_mode_name(bond_mode));
4508 } else {
4509 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4510 if (lacp_fast == -1) {
4511 pr_err("Error: Invalid lacp rate \"%s\"\n",
4512 lacp_rate == NULL ? "NULL" : lacp_rate);
4513 return -EINVAL;
4514 }
4515 }
4516 }
4517
4518 if (ad_select) {
4519 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4520 if (params->ad_select == -1) {
4521 pr_err("Error: Invalid ad_select \"%s\"\n",
4522 ad_select == NULL ? "NULL" : ad_select);
4523 return -EINVAL;
4524 }
4525
4526 if (bond_mode != BOND_MODE_8023AD) {
4527 pr_warning("ad_select param only affects 802.3ad mode\n");
4528 }
4529 } else {
4530 params->ad_select = BOND_AD_STABLE;
4531 }
4532
4533 if (max_bonds < 0) {
4534 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4535 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4536 max_bonds = BOND_DEFAULT_MAX_BONDS;
4537 }
4538
4539 if (miimon < 0) {
4540 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4541 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4542 miimon = BOND_LINK_MON_INTERV;
4543 }
4544
4545 if (updelay < 0) {
4546 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4547 updelay, INT_MAX);
4548 updelay = 0;
4549 }
4550
4551 if (downdelay < 0) {
4552 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4553 downdelay, INT_MAX);
4554 downdelay = 0;
4555 }
4556
4557 if ((use_carrier != 0) && (use_carrier != 1)) {
4558 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4559 use_carrier);
4560 use_carrier = 1;
4561 }
4562
4563 if (num_peer_notif < 0 || num_peer_notif > 255) {
4564 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4565 num_peer_notif);
4566 num_peer_notif = 1;
4567 }
4568
4569 /* reset values for 802.3ad */
4570 if (bond_mode == BOND_MODE_8023AD) {
4571 if (!miimon) {
4572 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");
4573 pr_warning("Forcing miimon to 100msec\n");
4574 miimon = 100;
4575 }
4576 }
4577
4578 if (tx_queues < 1 || tx_queues > 255) {
4579 pr_warning("Warning: tx_queues (%d) should be between "
4580 "1 and 255, resetting to %d\n",
4581 tx_queues, BOND_DEFAULT_TX_QUEUES);
4582 tx_queues = BOND_DEFAULT_TX_QUEUES;
4583 }
4584
4585 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4586 pr_warning("Warning: all_slaves_active module parameter (%d), "
4587 "not of valid value (0/1), so it was set to "
4588 "0\n", all_slaves_active);
4589 all_slaves_active = 0;
4590 }
4591
4592 if (resend_igmp < 0 || resend_igmp > 255) {
4593 pr_warning("Warning: resend_igmp (%d) should be between "
4594 "0 and 255, resetting to %d\n",
4595 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4596 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4597 }
4598
4599 /* reset values for TLB/ALB */
4600 if ((bond_mode == BOND_MODE_TLB) ||
4601 (bond_mode == BOND_MODE_ALB)) {
4602 if (!miimon) {
4603 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");
4604 pr_warning("Forcing miimon to 100msec\n");
4605 miimon = 100;
4606 }
4607 }
4608
4609 if (bond_mode == BOND_MODE_ALB) {
4610 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",
4611 updelay);
4612 }
4613
4614 if (!miimon) {
4615 if (updelay || downdelay) {
4616 /* just warn the user the up/down delay will have
4617 * no effect since miimon is zero...
4618 */
4619 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",
4620 updelay, downdelay);
4621 }
4622 } else {
4623 /* don't allow arp monitoring */
4624 if (arp_interval) {
4625 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4626 miimon, arp_interval);
4627 arp_interval = 0;
4628 }
4629
4630 if ((updelay % miimon) != 0) {
4631 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4632 updelay, miimon,
4633 (updelay / miimon) * miimon);
4634 }
4635
4636 updelay /= miimon;
4637
4638 if ((downdelay % miimon) != 0) {
4639 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4640 downdelay, miimon,
4641 (downdelay / miimon) * miimon);
4642 }
4643
4644 downdelay /= miimon;
4645 }
4646
4647 if (arp_interval < 0) {
4648 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4649 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4650 arp_interval = BOND_LINK_ARP_INTERV;
4651 }
4652
4653 for (arp_ip_count = 0;
4654 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4655 arp_ip_count++) {
4656 /* not complete check, but should be good enough to
4657 catch mistakes */
4658 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4659 if (!isdigit(arp_ip_target[arp_ip_count][0]) ||
4660 ip == 0 || ip == htonl(INADDR_BROADCAST)) {
4661 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4662 arp_ip_target[arp_ip_count]);
4663 arp_interval = 0;
4664 } else {
4665 arp_target[arp_ip_count] = ip;
4666 }
4667 }
4668
4669 if (arp_interval && !arp_ip_count) {
4670 /* don't allow arping if no arp_ip_target given... */
4671 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4672 arp_interval);
4673 arp_interval = 0;
4674 }
4675
4676 if (arp_validate) {
4677 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4678 pr_err("arp_validate only supported in active-backup mode\n");
4679 return -EINVAL;
4680 }
4681 if (!arp_interval) {
4682 pr_err("arp_validate requires arp_interval\n");
4683 return -EINVAL;
4684 }
4685
4686 arp_validate_value = bond_parse_parm(arp_validate,
4687 arp_validate_tbl);
4688 if (arp_validate_value == -1) {
4689 pr_err("Error: invalid arp_validate \"%s\"\n",
4690 arp_validate == NULL ? "NULL" : arp_validate);
4691 return -EINVAL;
4692 }
4693 } else
4694 arp_validate_value = 0;
4695
4696 if (miimon) {
4697 pr_info("MII link monitoring set to %d ms\n", miimon);
4698 } else if (arp_interval) {
4699 int i;
4700
4701 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4702 arp_interval,
4703 arp_validate_tbl[arp_validate_value].modename,
4704 arp_ip_count);
4705
4706 for (i = 0; i < arp_ip_count; i++)
4707 pr_info(" %s", arp_ip_target[i]);
4708
4709 pr_info("\n");
4710
4711 } else if (max_bonds) {
4712 /* miimon and arp_interval not set, we need one so things
4713 * work as expected, see bonding.txt for details
4714 */
4715 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");
4716 }
4717
4718 if (primary && !USES_PRIMARY(bond_mode)) {
4719 /* currently, using a primary only makes sense
4720 * in active backup, TLB or ALB modes
4721 */
4722 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4723 primary, bond_mode_name(bond_mode));
4724 primary = NULL;
4725 }
4726
4727 if (primary && primary_reselect) {
4728 primary_reselect_value = bond_parse_parm(primary_reselect,
4729 pri_reselect_tbl);
4730 if (primary_reselect_value == -1) {
4731 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4732 primary_reselect ==
4733 NULL ? "NULL" : primary_reselect);
4734 return -EINVAL;
4735 }
4736 } else {
4737 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4738 }
4739
4740 if (fail_over_mac) {
4741 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4742 fail_over_mac_tbl);
4743 if (fail_over_mac_value == -1) {
4744 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4745 arp_validate == NULL ? "NULL" : arp_validate);
4746 return -EINVAL;
4747 }
4748
4749 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4750 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4751 } else {
4752 fail_over_mac_value = BOND_FOM_NONE;
4753 }
4754
4755 /* fill params struct with the proper values */
4756 params->mode = bond_mode;
4757 params->xmit_policy = xmit_hashtype;
4758 params->miimon = miimon;
4759 params->num_peer_notif = num_peer_notif;
4760 params->arp_interval = arp_interval;
4761 params->arp_validate = arp_validate_value;
4762 params->updelay = updelay;
4763 params->downdelay = downdelay;
4764 params->use_carrier = use_carrier;
4765 params->lacp_fast = lacp_fast;
4766 params->primary[0] = 0;
4767 params->primary_reselect = primary_reselect_value;
4768 params->fail_over_mac = fail_over_mac_value;
4769 params->tx_queues = tx_queues;
4770 params->all_slaves_active = all_slaves_active;
4771 params->resend_igmp = resend_igmp;
4772 params->min_links = min_links;
4773
4774 if (primary) {
4775 strncpy(params->primary, primary, IFNAMSIZ);
4776 params->primary[IFNAMSIZ - 1] = 0;
4777 }
4778
4779 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4780
4781 return 0;
4782 }
4783
4784 static struct lock_class_key bonding_netdev_xmit_lock_key;
4785 static struct lock_class_key bonding_netdev_addr_lock_key;
4786 static struct lock_class_key bonding_tx_busylock_key;
4787
4788 static void bond_set_lockdep_class_one(struct net_device *dev,
4789 struct netdev_queue *txq,
4790 void *_unused)
4791 {
4792 lockdep_set_class(&txq->_xmit_lock,
4793 &bonding_netdev_xmit_lock_key);
4794 }
4795
4796 static void bond_set_lockdep_class(struct net_device *dev)
4797 {
4798 lockdep_set_class(&dev->addr_list_lock,
4799 &bonding_netdev_addr_lock_key);
4800 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4801 dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4802 }
4803
4804 /*
4805 * Called from registration process
4806 */
4807 static int bond_init(struct net_device *bond_dev)
4808 {
4809 struct bonding *bond = netdev_priv(bond_dev);
4810 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4811 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4812
4813 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4814
4815 /*
4816 * Initialize locks that may be required during
4817 * en/deslave operations. All of the bond_open work
4818 * (of which this is part) should really be moved to
4819 * a phase prior to dev_open
4820 */
4821 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4822 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4823
4824 bond->wq = create_singlethread_workqueue(bond_dev->name);
4825 if (!bond->wq)
4826 return -ENOMEM;
4827
4828 bond_set_lockdep_class(bond_dev);
4829
4830 list_add_tail(&bond->bond_list, &bn->dev_list);
4831
4832 bond_prepare_sysfs_group(bond);
4833
4834 bond_debug_register(bond);
4835
4836 /* Ensure valid dev_addr */
4837 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4838 bond_dev->addr_assign_type == NET_ADDR_PERM) {
4839 eth_hw_addr_random(bond_dev);
4840 bond->dev_addr_from_first = true;
4841 }
4842
4843 __hw_addr_init(&bond->mc_list);
4844 return 0;
4845 }
4846
4847 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4848 {
4849 if (tb[IFLA_ADDRESS]) {
4850 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4851 return -EINVAL;
4852 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4853 return -EADDRNOTAVAIL;
4854 }
4855 return 0;
4856 }
4857
4858 static unsigned int bond_get_num_tx_queues(void)
4859 {
4860 return tx_queues;
4861 }
4862
4863 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4864 .kind = "bond",
4865 .priv_size = sizeof(struct bonding),
4866 .setup = bond_setup,
4867 .validate = bond_validate,
4868 .get_num_tx_queues = bond_get_num_tx_queues,
4869 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number
4870 as for TX queues */
4871 };
4872
4873 /* Create a new bond based on the specified name and bonding parameters.
4874 * If name is NULL, obtain a suitable "bond%d" name for us.
4875 * Caller must NOT hold rtnl_lock; we need to release it here before we
4876 * set up our sysfs entries.
4877 */
4878 int bond_create(struct net *net, const char *name)
4879 {
4880 struct net_device *bond_dev;
4881 int res;
4882
4883 rtnl_lock();
4884
4885 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4886 name ? name : "bond%d",
4887 bond_setup, tx_queues);
4888 if (!bond_dev) {
4889 pr_err("%s: eek! can't alloc netdev!\n", name);
4890 rtnl_unlock();
4891 return -ENOMEM;
4892 }
4893
4894 dev_net_set(bond_dev, net);
4895 bond_dev->rtnl_link_ops = &bond_link_ops;
4896
4897 res = register_netdevice(bond_dev);
4898
4899 netif_carrier_off(bond_dev);
4900
4901 rtnl_unlock();
4902 if (res < 0)
4903 bond_destructor(bond_dev);
4904 return res;
4905 }
4906
4907 static int __net_init bond_net_init(struct net *net)
4908 {
4909 struct bond_net *bn = net_generic(net, bond_net_id);
4910
4911 bn->net = net;
4912 INIT_LIST_HEAD(&bn->dev_list);
4913
4914 bond_create_proc_dir(bn);
4915 bond_create_sysfs(bn);
4916
4917 return 0;
4918 }
4919
4920 static void __net_exit bond_net_exit(struct net *net)
4921 {
4922 struct bond_net *bn = net_generic(net, bond_net_id);
4923 struct bonding *bond, *tmp_bond;
4924 LIST_HEAD(list);
4925
4926 bond_destroy_sysfs(bn);
4927 bond_destroy_proc_dir(bn);
4928
4929 /* Kill off any bonds created after unregistering bond rtnl ops */
4930 rtnl_lock();
4931 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4932 unregister_netdevice_queue(bond->dev, &list);
4933 unregister_netdevice_many(&list);
4934 rtnl_unlock();
4935 }
4936
4937 static struct pernet_operations bond_net_ops = {
4938 .init = bond_net_init,
4939 .exit = bond_net_exit,
4940 .id = &bond_net_id,
4941 .size = sizeof(struct bond_net),
4942 };
4943
4944 static int __init bonding_init(void)
4945 {
4946 int i;
4947 int res;
4948
4949 pr_info("%s", bond_version);
4950
4951 res = bond_check_params(&bonding_defaults);
4952 if (res)
4953 goto out;
4954
4955 res = register_pernet_subsys(&bond_net_ops);
4956 if (res)
4957 goto out;
4958
4959 res = rtnl_link_register(&bond_link_ops);
4960 if (res)
4961 goto err_link;
4962
4963 bond_create_debugfs();
4964
4965 for (i = 0; i < max_bonds; i++) {
4966 res = bond_create(&init_net, NULL);
4967 if (res)
4968 goto err;
4969 }
4970
4971 register_netdevice_notifier(&bond_netdev_notifier);
4972 out:
4973 return res;
4974 err:
4975 rtnl_link_unregister(&bond_link_ops);
4976 err_link:
4977 unregister_pernet_subsys(&bond_net_ops);
4978 goto out;
4979
4980 }
4981
4982 static void __exit bonding_exit(void)
4983 {
4984 unregister_netdevice_notifier(&bond_netdev_notifier);
4985
4986 bond_destroy_debugfs();
4987
4988 rtnl_link_unregister(&bond_link_ops);
4989 unregister_pernet_subsys(&bond_net_ops);
4990
4991 #ifdef CONFIG_NET_POLL_CONTROLLER
4992 /*
4993 * Make sure we don't have an imbalance on our netpoll blocking
4994 */
4995 WARN_ON(atomic_read(&netpoll_block_tx));
4996 #endif
4997 }
4998
4999 module_init(bonding_init);
5000 module_exit(bonding_exit);
5001 MODULE_LICENSE("GPL");
5002 MODULE_VERSION(DRV_VERSION);
5003 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
5004 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
5005 MODULE_ALIAS_RTNL_LINK("bond");
Linux with added FPC-III support