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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / net / bonding / bond_main.c
blob2e70e43c5df5ca477e652d8ddcbb87dffa69dc25
1 /*
2 * originally based on the dummy device.
3 *
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
6 *
7 * bonding.c: an Ethernet Bonding driver
8 *
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
10 * Cisco 5500
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
13 * Linux Bonding
14 * and probably many L2 switches ...
15 *
16 * How it works:
17 * ifconfig bond0 ipaddress netmask up
18 * will setup a network device, with an ip address. No mac address
19 * will be assigned at this time. The hw mac address will come from
20 * the first slave bonded to the channel. All slaves will then use
21 * this hw mac address.
22 *
23 * ifconfig bond0 down
24 * will release all slaves, marking them as down.
25 *
26 * ifenslave bond0 eth0
27 * will attach eth0 to bond0 as a slave. eth0 hw mac address will either
28 * a: be used as initial mac address
29 * b: if a hw mac address already is there, eth0's hw mac address
30 * will then be set from bond0.
31 *
32 */
33
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/fcntl.h>
38 #include <linux/interrupt.h>
39 #include <linux/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/in.h>
42 #include <net/ip.h>
43 #include <linux/ip.h>
44 #include <linux/icmp.h>
45 #include <linux/icmpv6.h>
46 #include <linux/tcp.h>
47 #include <linux/udp.h>
48 #include <linux/slab.h>
49 #include <linux/string.h>
50 #include <linux/init.h>
51 #include <linux/timer.h>
52 #include <linux/socket.h>
53 #include <linux/ctype.h>
54 #include <linux/inet.h>
55 #include <linux/bitops.h>
56 #include <linux/io.h>
57 #include <asm/dma.h>
58 #include <linux/uaccess.h>
59 #include <linux/errno.h>
60 #include <linux/netdevice.h>
61 #include <linux/inetdevice.h>
62 #include <linux/igmp.h>
63 #include <linux/etherdevice.h>
64 #include <linux/skbuff.h>
65 #include <net/sock.h>
66 #include <linux/rtnetlink.h>
67 #include <linux/smp.h>
68 #include <linux/if_ether.h>
69 #include <net/arp.h>
70 #include <linux/mii.h>
71 #include <linux/ethtool.h>
72 #include <linux/if_vlan.h>
73 #include <linux/if_bonding.h>
74 #include <linux/jiffies.h>
75 #include <linux/preempt.h>
76 #include <net/route.h>
77 #include <net/net_namespace.h>
78 #include <net/netns/generic.h>
79 #include <net/pkt_sched.h>
80 #include <linux/rculist.h>
81 #include <net/flow_dissector.h>
82 #include <net/bonding.h>
83 #include <net/bond_3ad.h>
84 #include <net/bond_alb.h>
85
86 #include "bonding_priv.h"
87
88 /*---------------------------- Module parameters ----------------------------*/
89
90 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
91
92 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
93 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
94 static int num_peer_notif = 1;
95 static int miimon;
96 static int updelay;
97 static int downdelay;
98 static int use_carrier = 1;
99 static char *mode;
100 static char *primary;
101 static char *primary_reselect;
102 static char *lacp_rate;
103 static int min_links;
104 static char *ad_select;
105 static char *xmit_hash_policy;
106 static int arp_interval;
107 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
108 static char *arp_validate;
109 static char *arp_all_targets;
110 static char *fail_over_mac;
111 static int all_slaves_active;
112 static struct bond_params bonding_defaults;
113 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
114 static int packets_per_slave = 1;
115 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
116
117 module_param(max_bonds, int, 0);
118 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
119 module_param(tx_queues, int, 0);
120 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
121 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
122 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
123 "failover event (alias of num_unsol_na)");
124 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
125 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
126 "failover event (alias of num_grat_arp)");
127 module_param(miimon, int, 0);
128 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
129 module_param(updelay, int, 0);
130 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
131 module_param(downdelay, int, 0);
132 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
133 "in milliseconds");
134 module_param(use_carrier, int, 0);
135 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
136 "0 for off, 1 for on (default)");
137 module_param(mode, charp, 0);
138 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
139 "1 for active-backup, 2 for balance-xor, "
140 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
141 "6 for balance-alb");
142 module_param(primary, charp, 0);
143 MODULE_PARM_DESC(primary, "Primary network device to use");
144 module_param(primary_reselect, charp, 0);
145 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
146 "once it comes up; "
147 "0 for always (default), "
148 "1 for only if speed of primary is "
149 "better, "
150 "2 for only on active slave "
151 "failure");
152 module_param(lacp_rate, charp, 0);
153 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
154 "0 for slow, 1 for fast");
155 module_param(ad_select, charp, 0);
156 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
157 "0 for stable (default), 1 for bandwidth, "
158 "2 for count");
159 module_param(min_links, int, 0);
160 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
161
162 module_param(xmit_hash_policy, charp, 0);
163 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
164 "0 for layer 2 (default), 1 for layer 3+4, "
165 "2 for layer 2+3, 3 for encap layer 2+3, "
166 "4 for encap layer 3+4");
167 module_param(arp_interval, int, 0);
168 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
169 module_param_array(arp_ip_target, charp, NULL, 0);
170 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
171 module_param(arp_validate, charp, 0);
172 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
173 "0 for none (default), 1 for active, "
174 "2 for backup, 3 for all");
175 module_param(arp_all_targets, charp, 0);
176 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
177 module_param(fail_over_mac, charp, 0);
178 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
179 "the same MAC; 0 for none (default), "
180 "1 for active, 2 for follow");
181 module_param(all_slaves_active, int, 0);
182 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
183 "by setting active flag for all slaves; "
184 "0 for never (default), 1 for always.");
185 module_param(resend_igmp, int, 0);
186 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
187 "link failure");
188 module_param(packets_per_slave, int, 0);
189 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
190 "mode; 0 for a random slave, 1 packet per "
191 "slave (default), >1 packets per slave.");
192 module_param(lp_interval, uint, 0);
193 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
194 "the bonding driver sends learning packets to "
195 "each slaves peer switch. The default is 1.");
196
197 /*----------------------------- Global variables ----------------------------*/
198
199 #ifdef CONFIG_NET_POLL_CONTROLLER
200 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
201 #endif
202
203 unsigned int bond_net_id __read_mostly;
204
205 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
206 {
207 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
208 .offset = offsetof(struct flow_keys, control),
209 },
210 {
211 .key_id = FLOW_DISSECTOR_KEY_BASIC,
212 .offset = offsetof(struct flow_keys, basic),
213 },
214 {
215 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
216 .offset = offsetof(struct flow_keys, addrs.v4addrs),
217 },
218 {
219 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
220 .offset = offsetof(struct flow_keys, addrs.v6addrs),
221 },
222 {
223 .key_id = FLOW_DISSECTOR_KEY_TIPC,
224 .offset = offsetof(struct flow_keys, addrs.tipckey),
225 },
226 {
227 .key_id = FLOW_DISSECTOR_KEY_PORTS,
228 .offset = offsetof(struct flow_keys, ports),
229 },
230 {
231 .key_id = FLOW_DISSECTOR_KEY_ICMP,
232 .offset = offsetof(struct flow_keys, icmp),
233 },
234 {
235 .key_id = FLOW_DISSECTOR_KEY_VLAN,
236 .offset = offsetof(struct flow_keys, vlan),
237 },
238 {
239 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
240 .offset = offsetof(struct flow_keys, tags),
241 },
242 {
243 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
244 .offset = offsetof(struct flow_keys, keyid),
245 },
246 };
247
248 static struct flow_dissector flow_keys_bonding __read_mostly;
249
250 /*-------------------------- Forward declarations ---------------------------*/
251
252 static int bond_init(struct net_device *bond_dev);
253 static void bond_uninit(struct net_device *bond_dev);
254 static void bond_get_stats(struct net_device *bond_dev,
255 struct rtnl_link_stats64 *stats);
256 static void bond_slave_arr_handler(struct work_struct *work);
257 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
258 int mod);
259 static void bond_netdev_notify_work(struct work_struct *work);
260
261 /*---------------------------- General routines -----------------------------*/
262
263 const char *bond_mode_name(int mode)
264 {
265 static const char *names[] = {
266 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
267 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
268 [BOND_MODE_XOR] = "load balancing (xor)",
269 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
270 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
271 [BOND_MODE_TLB] = "transmit load balancing",
272 [BOND_MODE_ALB] = "adaptive load balancing",
273 };
274
275 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
276 return "unknown";
277
278 return names[mode];
279 }
280
281 /*---------------------------------- VLAN -----------------------------------*/
282
283 /**
284 * bond_dev_queue_xmit - Prepare skb for xmit.
285 *
286 * @bond: bond device that got this skb for tx.
287 * @skb: hw accel VLAN tagged skb to transmit
288 * @slave_dev: slave that is supposed to xmit this skbuff
289 */
290 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
291 struct net_device *slave_dev)
292 {
293 skb->dev = slave_dev;
294
295 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
296 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
297 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
298
299 if (unlikely(netpoll_tx_running(bond->dev)))
300 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
301 else
302 dev_queue_xmit(skb);
303 }
304
305 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
306 * We don't protect the slave list iteration with a lock because:
307 * a. This operation is performed in IOCTL context,
308 * b. The operation is protected by the RTNL semaphore in the 8021q code,
309 * c. Holding a lock with BH disabled while directly calling a base driver
310 * entry point is generally a BAD idea.
311 *
312 * The design of synchronization/protection for this operation in the 8021q
313 * module is good for one or more VLAN devices over a single physical device
314 * and cannot be extended for a teaming solution like bonding, so there is a
315 * potential race condition here where a net device from the vlan group might
316 * be referenced (either by a base driver or the 8021q code) while it is being
317 * removed from the system. However, it turns out we're not making matters
318 * worse, and if it works for regular VLAN usage it will work here too.
319 */
320
321 /**
322 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
323 * @bond_dev: bonding net device that got called
324 * @vid: vlan id being added
325 */
326 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
327 __be16 proto, u16 vid)
328 {
329 struct bonding *bond = netdev_priv(bond_dev);
330 struct slave *slave, *rollback_slave;
331 struct list_head *iter;
332 int res;
333
334 bond_for_each_slave(bond, slave, iter) {
335 res = vlan_vid_add(slave->dev, proto, vid);
336 if (res)
337 goto unwind;
338 }
339
340 return 0;
341
342 unwind:
343 /* unwind to the slave that failed */
344 bond_for_each_slave(bond, rollback_slave, iter) {
345 if (rollback_slave == slave)
346 break;
347
348 vlan_vid_del(rollback_slave->dev, proto, vid);
349 }
350
351 return res;
352 }
353
354 /**
355 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
356 * @bond_dev: bonding net device that got called
357 * @vid: vlan id being removed
358 */
359 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
360 __be16 proto, u16 vid)
361 {
362 struct bonding *bond = netdev_priv(bond_dev);
363 struct list_head *iter;
364 struct slave *slave;
365
366 bond_for_each_slave(bond, slave, iter)
367 vlan_vid_del(slave->dev, proto, vid);
368
369 if (bond_is_lb(bond))
370 bond_alb_clear_vlan(bond, vid);
371
372 return 0;
373 }
374
375 /*------------------------------- Link status -------------------------------*/
376
377 /* Set the carrier state for the master according to the state of its
378 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
379 * do special 802.3ad magic.
380 *
381 * Returns zero if carrier state does not change, nonzero if it does.
382 */
383 int bond_set_carrier(struct bonding *bond)
384 {
385 struct list_head *iter;
386 struct slave *slave;
387
388 if (!bond_has_slaves(bond))
389 goto down;
390
391 if (BOND_MODE(bond) == BOND_MODE_8023AD)
392 return bond_3ad_set_carrier(bond);
393
394 bond_for_each_slave(bond, slave, iter) {
395 if (slave->link == BOND_LINK_UP) {
396 if (!netif_carrier_ok(bond->dev)) {
397 netif_carrier_on(bond->dev);
398 return 1;
399 }
400 return 0;
401 }
402 }
403
404 down:
405 if (netif_carrier_ok(bond->dev)) {
406 netif_carrier_off(bond->dev);
407 return 1;
408 }
409 return 0;
410 }
411
412 /* Get link speed and duplex from the slave's base driver
413 * using ethtool. If for some reason the call fails or the
414 * values are invalid, set speed and duplex to -1,
415 * and return. Return 1 if speed or duplex settings are
416 * UNKNOWN; 0 otherwise.
417 */
418 static int bond_update_speed_duplex(struct slave *slave)
419 {
420 struct net_device *slave_dev = slave->dev;
421 struct ethtool_link_ksettings ecmd;
422 int res;
423
424 slave->speed = SPEED_UNKNOWN;
425 slave->duplex = DUPLEX_UNKNOWN;
426
427 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
428 if (res < 0)
429 return 1;
430 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
431 return 1;
432 switch (ecmd.base.duplex) {
433 case DUPLEX_FULL:
434 case DUPLEX_HALF:
435 break;
436 default:
437 return 1;
438 }
439
440 slave->speed = ecmd.base.speed;
441 slave->duplex = ecmd.base.duplex;
442
443 return 0;
444 }
445
446 const char *bond_slave_link_status(s8 link)
447 {
448 switch (link) {
449 case BOND_LINK_UP:
450 return "up";
451 case BOND_LINK_FAIL:
452 return "going down";
453 case BOND_LINK_DOWN:
454 return "down";
455 case BOND_LINK_BACK:
456 return "going back";
457 default:
458 return "unknown";
459 }
460 }
461
462 /* if <dev> supports MII link status reporting, check its link status.
463 *
464 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
465 * depending upon the setting of the use_carrier parameter.
466 *
467 * Return either BMSR_LSTATUS, meaning that the link is up (or we
468 * can't tell and just pretend it is), or 0, meaning that the link is
469 * down.
470 *
471 * If reporting is non-zero, instead of faking link up, return -1 if
472 * both ETHTOOL and MII ioctls fail (meaning the device does not
473 * support them). If use_carrier is set, return whatever it says.
474 * It'd be nice if there was a good way to tell if a driver supports
475 * netif_carrier, but there really isn't.
476 */
477 static int bond_check_dev_link(struct bonding *bond,
478 struct net_device *slave_dev, int reporting)
479 {
480 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
481 int (*ioctl)(struct net_device *, struct ifreq *, int);
482 struct ifreq ifr;
483 struct mii_ioctl_data *mii;
484
485 if (!reporting && !netif_running(slave_dev))
486 return 0;
487
488 if (bond->params.use_carrier)
489 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
490
491 /* Try to get link status using Ethtool first. */
492 if (slave_dev->ethtool_ops->get_link)
493 return slave_dev->ethtool_ops->get_link(slave_dev) ?
494 BMSR_LSTATUS : 0;
495
496 /* Ethtool can't be used, fallback to MII ioctls. */
497 ioctl = slave_ops->ndo_do_ioctl;
498 if (ioctl) {
499 /* TODO: set pointer to correct ioctl on a per team member
500 * bases to make this more efficient. that is, once
501 * we determine the correct ioctl, we will always
502 * call it and not the others for that team
503 * member.
504 */
505
506 /* We cannot assume that SIOCGMIIPHY will also read a
507 * register; not all network drivers (e.g., e100)
508 * support that.
509 */
510
511 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
512 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
513 mii = if_mii(&ifr);
514 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
515 mii->reg_num = MII_BMSR;
516 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
517 return mii->val_out & BMSR_LSTATUS;
518 }
519 }
520
521 /* If reporting, report that either there's no dev->do_ioctl,
522 * or both SIOCGMIIREG and get_link failed (meaning that we
523 * cannot report link status). If not reporting, pretend
524 * we're ok.
525 */
526 return reporting ? -1 : BMSR_LSTATUS;
527 }
528
529 /*----------------------------- Multicast list ------------------------------*/
530
531 /* Push the promiscuity flag down to appropriate slaves */
532 static int bond_set_promiscuity(struct bonding *bond, int inc)
533 {
534 struct list_head *iter;
535 int err = 0;
536
537 if (bond_uses_primary(bond)) {
538 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
539
540 if (curr_active)
541 err = dev_set_promiscuity(curr_active->dev, inc);
542 } else {
543 struct slave *slave;
544
545 bond_for_each_slave(bond, slave, iter) {
546 err = dev_set_promiscuity(slave->dev, inc);
547 if (err)
548 return err;
549 }
550 }
551 return err;
552 }
553
554 /* Push the allmulti flag down to all slaves */
555 static int bond_set_allmulti(struct bonding *bond, int inc)
556 {
557 struct list_head *iter;
558 int err = 0;
559
560 if (bond_uses_primary(bond)) {
561 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
562
563 if (curr_active)
564 err = dev_set_allmulti(curr_active->dev, inc);
565 } else {
566 struct slave *slave;
567
568 bond_for_each_slave(bond, slave, iter) {
569 err = dev_set_allmulti(slave->dev, inc);
570 if (err)
571 return err;
572 }
573 }
574 return err;
575 }
576
577 /* Retrieve the list of registered multicast addresses for the bonding
578 * device and retransmit an IGMP JOIN request to the current active
579 * slave.
580 */
581 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
582 {
583 struct bonding *bond = container_of(work, struct bonding,
584 mcast_work.work);
585
586 if (!rtnl_trylock()) {
587 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
588 return;
589 }
590 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
591
592 if (bond->igmp_retrans > 1) {
593 bond->igmp_retrans--;
594 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
595 }
596 rtnl_unlock();
597 }
598
599 /* Flush bond's hardware addresses from slave */
600 static void bond_hw_addr_flush(struct net_device *bond_dev,
601 struct net_device *slave_dev)
602 {
603 struct bonding *bond = netdev_priv(bond_dev);
604
605 dev_uc_unsync(slave_dev, bond_dev);
606 dev_mc_unsync(slave_dev, bond_dev);
607
608 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
609 /* del lacpdu mc addr from mc list */
610 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
611
612 dev_mc_del(slave_dev, lacpdu_multicast);
613 }
614 }
615
616 /*--------------------------- Active slave change ---------------------------*/
617
618 /* Update the hardware address list and promisc/allmulti for the new and
619 * old active slaves (if any). Modes that are not using primary keep all
620 * slaves up date at all times; only the modes that use primary need to call
621 * this function to swap these settings during a failover.
622 */
623 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
624 struct slave *old_active)
625 {
626 if (old_active) {
627 if (bond->dev->flags & IFF_PROMISC)
628 dev_set_promiscuity(old_active->dev, -1);
629
630 if (bond->dev->flags & IFF_ALLMULTI)
631 dev_set_allmulti(old_active->dev, -1);
632
633 bond_hw_addr_flush(bond->dev, old_active->dev);
634 }
635
636 if (new_active) {
637 /* FIXME: Signal errors upstream. */
638 if (bond->dev->flags & IFF_PROMISC)
639 dev_set_promiscuity(new_active->dev, 1);
640
641 if (bond->dev->flags & IFF_ALLMULTI)
642 dev_set_allmulti(new_active->dev, 1);
643
644 netif_addr_lock_bh(bond->dev);
645 dev_uc_sync(new_active->dev, bond->dev);
646 dev_mc_sync(new_active->dev, bond->dev);
647 netif_addr_unlock_bh(bond->dev);
648 }
649 }
650
651 /**
652 * bond_set_dev_addr - clone slave's address to bond
653 * @bond_dev: bond net device
654 * @slave_dev: slave net device
655 *
656 * Should be called with RTNL held.
657 */
658 static int bond_set_dev_addr(struct net_device *bond_dev,
659 struct net_device *slave_dev)
660 {
661 int err;
662
663 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
664 bond_dev, slave_dev, slave_dev->addr_len);
665 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
666 if (err)
667 return err;
668
669 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
670 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
671 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
672 return 0;
673 }
674
675 static struct slave *bond_get_old_active(struct bonding *bond,
676 struct slave *new_active)
677 {
678 struct slave *slave;
679 struct list_head *iter;
680
681 bond_for_each_slave(bond, slave, iter) {
682 if (slave == new_active)
683 continue;
684
685 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
686 return slave;
687 }
688
689 return NULL;
690 }
691
692 /* bond_do_fail_over_mac
693 *
694 * Perform special MAC address swapping for fail_over_mac settings
695 *
696 * Called with RTNL
697 */
698 static void bond_do_fail_over_mac(struct bonding *bond,
699 struct slave *new_active,
700 struct slave *old_active)
701 {
702 u8 tmp_mac[MAX_ADDR_LEN];
703 struct sockaddr_storage ss;
704 int rv;
705
706 switch (bond->params.fail_over_mac) {
707 case BOND_FOM_ACTIVE:
708 if (new_active) {
709 rv = bond_set_dev_addr(bond->dev, new_active->dev);
710 if (rv)
711 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
712 -rv);
713 }
714 break;
715 case BOND_FOM_FOLLOW:
716 /* if new_active && old_active, swap them
717 * if just old_active, do nothing (going to no active slave)
718 * if just new_active, set new_active to bond's MAC
719 */
720 if (!new_active)
721 return;
722
723 if (!old_active)
724 old_active = bond_get_old_active(bond, new_active);
725
726 if (old_active) {
727 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
728 new_active->dev->addr_len);
729 bond_hw_addr_copy(ss.__data,
730 old_active->dev->dev_addr,
731 old_active->dev->addr_len);
732 ss.ss_family = new_active->dev->type;
733 } else {
734 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
735 bond->dev->addr_len);
736 ss.ss_family = bond->dev->type;
737 }
738
739 rv = dev_set_mac_address(new_active->dev,
740 (struct sockaddr *)&ss, NULL);
741 if (rv) {
742 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
743 -rv);
744 goto out;
745 }
746
747 if (!old_active)
748 goto out;
749
750 bond_hw_addr_copy(ss.__data, tmp_mac,
751 new_active->dev->addr_len);
752 ss.ss_family = old_active->dev->type;
753
754 rv = dev_set_mac_address(old_active->dev,
755 (struct sockaddr *)&ss, NULL);
756 if (rv)
757 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
758 -rv);
759 out:
760 break;
761 default:
762 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
763 bond->params.fail_over_mac);
764 break;
765 }
766
767 }
768
769 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
770 {
771 struct slave *prim = rtnl_dereference(bond->primary_slave);
772 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
773
774 if (!prim || prim->link != BOND_LINK_UP) {
775 if (!curr || curr->link != BOND_LINK_UP)
776 return NULL;
777 return curr;
778 }
779
780 if (bond->force_primary) {
781 bond->force_primary = false;
782 return prim;
783 }
784
785 if (!curr || curr->link != BOND_LINK_UP)
786 return prim;
787
788 /* At this point, prim and curr are both up */
789 switch (bond->params.primary_reselect) {
790 case BOND_PRI_RESELECT_ALWAYS:
791 return prim;
792 case BOND_PRI_RESELECT_BETTER:
793 if (prim->speed < curr->speed)
794 return curr;
795 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
796 return curr;
797 return prim;
798 case BOND_PRI_RESELECT_FAILURE:
799 return curr;
800 default:
801 netdev_err(bond->dev, "impossible primary_reselect %d\n",
802 bond->params.primary_reselect);
803 return curr;
804 }
805 }
806
807 /**
808 * bond_find_best_slave - select the best available slave to be the active one
809 * @bond: our bonding struct
810 */
811 static struct slave *bond_find_best_slave(struct bonding *bond)
812 {
813 struct slave *slave, *bestslave = NULL;
814 struct list_head *iter;
815 int mintime = bond->params.updelay;
816
817 slave = bond_choose_primary_or_current(bond);
818 if (slave)
819 return slave;
820
821 bond_for_each_slave(bond, slave, iter) {
822 if (slave->link == BOND_LINK_UP)
823 return slave;
824 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
825 slave->delay < mintime) {
826 mintime = slave->delay;
827 bestslave = slave;
828 }
829 }
830
831 return bestslave;
832 }
833
834 static bool bond_should_notify_peers(struct bonding *bond)
835 {
836 struct slave *slave;
837
838 rcu_read_lock();
839 slave = rcu_dereference(bond->curr_active_slave);
840 rcu_read_unlock();
841
842 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
843 slave ? slave->dev->name : "NULL");
844
845 if (!slave || !bond->send_peer_notif ||
846 bond->send_peer_notif %
847 max(1, bond->params.peer_notif_delay) != 0 ||
848 !netif_carrier_ok(bond->dev) ||
849 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
850 return false;
851
852 return true;
853 }
854
855 /**
856 * change_active_interface - change the active slave into the specified one
857 * @bond: our bonding struct
858 * @new: the new slave to make the active one
859 *
860 * Set the new slave to the bond's settings and unset them on the old
861 * curr_active_slave.
862 * Setting include flags, mc-list, promiscuity, allmulti, etc.
863 *
864 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
865 * because it is apparently the best available slave we have, even though its
866 * updelay hasn't timed out yet.
867 *
868 * Caller must hold RTNL.
869 */
870 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
871 {
872 struct slave *old_active;
873
874 ASSERT_RTNL();
875
876 old_active = rtnl_dereference(bond->curr_active_slave);
877
878 if (old_active == new_active)
879 return;
880
881 if (new_active) {
882 new_active->last_link_up = jiffies;
883
884 if (new_active->link == BOND_LINK_BACK) {
885 if (bond_uses_primary(bond)) {
886 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
887 (bond->params.updelay - new_active->delay) * bond->params.miimon);
888 }
889
890 new_active->delay = 0;
891 bond_set_slave_link_state(new_active, BOND_LINK_UP,
892 BOND_SLAVE_NOTIFY_NOW);
893
894 if (BOND_MODE(bond) == BOND_MODE_8023AD)
895 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
896
897 if (bond_is_lb(bond))
898 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
899 } else {
900 if (bond_uses_primary(bond)) {
901 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
902 }
903 }
904 }
905
906 if (bond_uses_primary(bond))
907 bond_hw_addr_swap(bond, new_active, old_active);
908
909 if (bond_is_lb(bond)) {
910 bond_alb_handle_active_change(bond, new_active);
911 if (old_active)
912 bond_set_slave_inactive_flags(old_active,
913 BOND_SLAVE_NOTIFY_NOW);
914 if (new_active)
915 bond_set_slave_active_flags(new_active,
916 BOND_SLAVE_NOTIFY_NOW);
917 } else {
918 rcu_assign_pointer(bond->curr_active_slave, new_active);
919 }
920
921 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
922 if (old_active)
923 bond_set_slave_inactive_flags(old_active,
924 BOND_SLAVE_NOTIFY_NOW);
925
926 if (new_active) {
927 bool should_notify_peers = false;
928
929 bond_set_slave_active_flags(new_active,
930 BOND_SLAVE_NOTIFY_NOW);
931
932 if (bond->params.fail_over_mac)
933 bond_do_fail_over_mac(bond, new_active,
934 old_active);
935
936 if (netif_running(bond->dev)) {
937 bond->send_peer_notif =
938 bond->params.num_peer_notif *
939 max(1, bond->params.peer_notif_delay);
940 should_notify_peers =
941 bond_should_notify_peers(bond);
942 }
943
944 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
945 if (should_notify_peers) {
946 bond->send_peer_notif--;
947 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
948 bond->dev);
949 }
950 }
951 }
952
953 /* resend IGMP joins since active slave has changed or
954 * all were sent on curr_active_slave.
955 * resend only if bond is brought up with the affected
956 * bonding modes and the retransmission is enabled
957 */
958 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
959 ((bond_uses_primary(bond) && new_active) ||
960 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
961 bond->igmp_retrans = bond->params.resend_igmp;
962 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
963 }
964 }
965
966 /**
967 * bond_select_active_slave - select a new active slave, if needed
968 * @bond: our bonding struct
969 *
970 * This functions should be called when one of the following occurs:
971 * - The old curr_active_slave has been released or lost its link.
972 * - The primary_slave has got its link back.
973 * - A slave has got its link back and there's no old curr_active_slave.
974 *
975 * Caller must hold RTNL.
976 */
977 void bond_select_active_slave(struct bonding *bond)
978 {
979 struct slave *best_slave;
980 int rv;
981
982 ASSERT_RTNL();
983
984 best_slave = bond_find_best_slave(bond);
985 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
986 bond_change_active_slave(bond, best_slave);
987 rv = bond_set_carrier(bond);
988 if (!rv)
989 return;
990
991 if (netif_carrier_ok(bond->dev))
992 netdev_info(bond->dev, "active interface up!\n");
993 else
994 netdev_info(bond->dev, "now running without any active interface!\n");
995 }
996 }
997
998 #ifdef CONFIG_NET_POLL_CONTROLLER
999 static inline int slave_enable_netpoll(struct slave *slave)
1000 {
1001 struct netpoll *np;
1002 int err = 0;
1003
1004 np = kzalloc(sizeof(*np), GFP_KERNEL);
1005 err = -ENOMEM;
1006 if (!np)
1007 goto out;
1008
1009 err = __netpoll_setup(np, slave->dev);
1010 if (err) {
1011 kfree(np);
1012 goto out;
1013 }
1014 slave->np = np;
1015 out:
1016 return err;
1017 }
1018 static inline void slave_disable_netpoll(struct slave *slave)
1019 {
1020 struct netpoll *np = slave->np;
1021
1022 if (!np)
1023 return;
1024
1025 slave->np = NULL;
1026
1027 __netpoll_free(np);
1028 }
1029
1030 static void bond_poll_controller(struct net_device *bond_dev)
1031 {
1032 struct bonding *bond = netdev_priv(bond_dev);
1033 struct slave *slave = NULL;
1034 struct list_head *iter;
1035 struct ad_info ad_info;
1036
1037 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1038 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1039 return;
1040
1041 bond_for_each_slave_rcu(bond, slave, iter) {
1042 if (!bond_slave_is_up(slave))
1043 continue;
1044
1045 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1046 struct aggregator *agg =
1047 SLAVE_AD_INFO(slave)->port.aggregator;
1048
1049 if (agg &&
1050 agg->aggregator_identifier != ad_info.aggregator_id)
1051 continue;
1052 }
1053
1054 netpoll_poll_dev(slave->dev);
1055 }
1056 }
1057
1058 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1059 {
1060 struct bonding *bond = netdev_priv(bond_dev);
1061 struct list_head *iter;
1062 struct slave *slave;
1063
1064 bond_for_each_slave(bond, slave, iter)
1065 if (bond_slave_is_up(slave))
1066 slave_disable_netpoll(slave);
1067 }
1068
1069 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1070 {
1071 struct bonding *bond = netdev_priv(dev);
1072 struct list_head *iter;
1073 struct slave *slave;
1074 int err = 0;
1075
1076 bond_for_each_slave(bond, slave, iter) {
1077 err = slave_enable_netpoll(slave);
1078 if (err) {
1079 bond_netpoll_cleanup(dev);
1080 break;
1081 }
1082 }
1083 return err;
1084 }
1085 #else
1086 static inline int slave_enable_netpoll(struct slave *slave)
1087 {
1088 return 0;
1089 }
1090 static inline void slave_disable_netpoll(struct slave *slave)
1091 {
1092 }
1093 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1094 {
1095 }
1096 #endif
1097
1098 /*---------------------------------- IOCTL ----------------------------------*/
1099
1100 static netdev_features_t bond_fix_features(struct net_device *dev,
1101 netdev_features_t features)
1102 {
1103 struct bonding *bond = netdev_priv(dev);
1104 struct list_head *iter;
1105 netdev_features_t mask;
1106 struct slave *slave;
1107
1108 mask = features;
1109
1110 features &= ~NETIF_F_ONE_FOR_ALL;
1111 features |= NETIF_F_ALL_FOR_ALL;
1112
1113 bond_for_each_slave(bond, slave, iter) {
1114 features = netdev_increment_features(features,
1115 slave->dev->features,
1116 mask);
1117 }
1118 features = netdev_add_tso_features(features, mask);
1119
1120 return features;
1121 }
1122
1123 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1124 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1125 NETIF_F_HIGHDMA | NETIF_F_LRO)
1126
1127 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1128 NETIF_F_RXCSUM | NETIF_F_ALL_TSO)
1129
1130 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1131 NETIF_F_ALL_TSO)
1132
1133 static void bond_compute_features(struct bonding *bond)
1134 {
1135 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1136 IFF_XMIT_DST_RELEASE_PERM;
1137 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1138 netdev_features_t enc_features = BOND_ENC_FEATURES;
1139 netdev_features_t mpls_features = BOND_MPLS_FEATURES;
1140 struct net_device *bond_dev = bond->dev;
1141 struct list_head *iter;
1142 struct slave *slave;
1143 unsigned short max_hard_header_len = ETH_HLEN;
1144 unsigned int gso_max_size = GSO_MAX_SIZE;
1145 u16 gso_max_segs = GSO_MAX_SEGS;
1146
1147 if (!bond_has_slaves(bond))
1148 goto done;
1149 vlan_features &= NETIF_F_ALL_FOR_ALL;
1150 mpls_features &= NETIF_F_ALL_FOR_ALL;
1151
1152 bond_for_each_slave(bond, slave, iter) {
1153 vlan_features = netdev_increment_features(vlan_features,
1154 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1155
1156 enc_features = netdev_increment_features(enc_features,
1157 slave->dev->hw_enc_features,
1158 BOND_ENC_FEATURES);
1159
1160 mpls_features = netdev_increment_features(mpls_features,
1161 slave->dev->mpls_features,
1162 BOND_MPLS_FEATURES);
1163
1164 dst_release_flag &= slave->dev->priv_flags;
1165 if (slave->dev->hard_header_len > max_hard_header_len)
1166 max_hard_header_len = slave->dev->hard_header_len;
1167
1168 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1169 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1170 }
1171 bond_dev->hard_header_len = max_hard_header_len;
1172
1173 done:
1174 bond_dev->vlan_features = vlan_features;
1175 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1176 NETIF_F_HW_VLAN_CTAG_TX |
1177 NETIF_F_HW_VLAN_STAG_TX |
1178 NETIF_F_GSO_UDP_L4;
1179 bond_dev->mpls_features = mpls_features;
1180 bond_dev->gso_max_segs = gso_max_segs;
1181 netif_set_gso_max_size(bond_dev, gso_max_size);
1182
1183 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1184 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1185 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1186 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1187
1188 netdev_change_features(bond_dev);
1189 }
1190
1191 static void bond_setup_by_slave(struct net_device *bond_dev,
1192 struct net_device *slave_dev)
1193 {
1194 bond_dev->header_ops = slave_dev->header_ops;
1195
1196 bond_dev->type = slave_dev->type;
1197 bond_dev->hard_header_len = slave_dev->hard_header_len;
1198 bond_dev->addr_len = slave_dev->addr_len;
1199
1200 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1201 slave_dev->addr_len);
1202 }
1203
1204 /* On bonding slaves other than the currently active slave, suppress
1205 * duplicates except for alb non-mcast/bcast.
1206 */
1207 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1208 struct slave *slave,
1209 struct bonding *bond)
1210 {
1211 if (bond_is_slave_inactive(slave)) {
1212 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1213 skb->pkt_type != PACKET_BROADCAST &&
1214 skb->pkt_type != PACKET_MULTICAST)
1215 return false;
1216 return true;
1217 }
1218 return false;
1219 }
1220
1221 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1222 {
1223 struct sk_buff *skb = *pskb;
1224 struct slave *slave;
1225 struct bonding *bond;
1226 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1227 struct slave *);
1228 int ret = RX_HANDLER_ANOTHER;
1229
1230 skb = skb_share_check(skb, GFP_ATOMIC);
1231 if (unlikely(!skb))
1232 return RX_HANDLER_CONSUMED;
1233
1234 *pskb = skb;
1235
1236 slave = bond_slave_get_rcu(skb->dev);
1237 bond = slave->bond;
1238
1239 recv_probe = READ_ONCE(bond->recv_probe);
1240 if (recv_probe) {
1241 ret = recv_probe(skb, bond, slave);
1242 if (ret == RX_HANDLER_CONSUMED) {
1243 consume_skb(skb);
1244 return ret;
1245 }
1246 }
1247
1248 /*
1249 * For packets determined by bond_should_deliver_exact_match() call to
1250 * be suppressed we want to make an exception for link-local packets.
1251 * This is necessary for e.g. LLDP daemons to be able to monitor
1252 * inactive slave links without being forced to bind to them
1253 * explicitly.
1254 *
1255 * At the same time, packets that are passed to the bonding master
1256 * (including link-local ones) can have their originating interface
1257 * determined via PACKET_ORIGDEV socket option.
1258 */
1259 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1260 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1261 return RX_HANDLER_PASS;
1262 return RX_HANDLER_EXACT;
1263 }
1264
1265 skb->dev = bond->dev;
1266
1267 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1268 netif_is_bridge_port(bond->dev) &&
1269 skb->pkt_type == PACKET_HOST) {
1270
1271 if (unlikely(skb_cow_head(skb,
1272 skb->data - skb_mac_header(skb)))) {
1273 kfree_skb(skb);
1274 return RX_HANDLER_CONSUMED;
1275 }
1276 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1277 bond->dev->addr_len);
1278 }
1279
1280 return ret;
1281 }
1282
1283 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1284 {
1285 switch (BOND_MODE(bond)) {
1286 case BOND_MODE_ROUNDROBIN:
1287 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1288 case BOND_MODE_ACTIVEBACKUP:
1289 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1290 case BOND_MODE_BROADCAST:
1291 return NETDEV_LAG_TX_TYPE_BROADCAST;
1292 case BOND_MODE_XOR:
1293 case BOND_MODE_8023AD:
1294 return NETDEV_LAG_TX_TYPE_HASH;
1295 default:
1296 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1297 }
1298 }
1299
1300 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1301 enum netdev_lag_tx_type type)
1302 {
1303 if (type != NETDEV_LAG_TX_TYPE_HASH)
1304 return NETDEV_LAG_HASH_NONE;
1305
1306 switch (bond->params.xmit_policy) {
1307 case BOND_XMIT_POLICY_LAYER2:
1308 return NETDEV_LAG_HASH_L2;
1309 case BOND_XMIT_POLICY_LAYER34:
1310 return NETDEV_LAG_HASH_L34;
1311 case BOND_XMIT_POLICY_LAYER23:
1312 return NETDEV_LAG_HASH_L23;
1313 case BOND_XMIT_POLICY_ENCAP23:
1314 return NETDEV_LAG_HASH_E23;
1315 case BOND_XMIT_POLICY_ENCAP34:
1316 return NETDEV_LAG_HASH_E34;
1317 default:
1318 return NETDEV_LAG_HASH_UNKNOWN;
1319 }
1320 }
1321
1322 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1323 struct netlink_ext_ack *extack)
1324 {
1325 struct netdev_lag_upper_info lag_upper_info;
1326 enum netdev_lag_tx_type type;
1327
1328 type = bond_lag_tx_type(bond);
1329 lag_upper_info.tx_type = type;
1330 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1331
1332 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1333 &lag_upper_info, extack);
1334 }
1335
1336 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1337 {
1338 netdev_upper_dev_unlink(slave->dev, bond->dev);
1339 slave->dev->flags &= ~IFF_SLAVE;
1340 }
1341
1342 static struct slave *bond_alloc_slave(struct bonding *bond)
1343 {
1344 struct slave *slave = NULL;
1345
1346 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1347 if (!slave)
1348 return NULL;
1349
1350 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1351 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1352 GFP_KERNEL);
1353 if (!SLAVE_AD_INFO(slave)) {
1354 kfree(slave);
1355 return NULL;
1356 }
1357 }
1358 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1359
1360 return slave;
1361 }
1362
1363 static void bond_free_slave(struct slave *slave)
1364 {
1365 struct bonding *bond = bond_get_bond_by_slave(slave);
1366
1367 cancel_delayed_work_sync(&slave->notify_work);
1368 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1369 kfree(SLAVE_AD_INFO(slave));
1370
1371 kfree(slave);
1372 }
1373
1374 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1375 {
1376 info->bond_mode = BOND_MODE(bond);
1377 info->miimon = bond->params.miimon;
1378 info->num_slaves = bond->slave_cnt;
1379 }
1380
1381 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1382 {
1383 strcpy(info->slave_name, slave->dev->name);
1384 info->link = slave->link;
1385 info->state = bond_slave_state(slave);
1386 info->link_failure_count = slave->link_failure_count;
1387 }
1388
1389 static void bond_netdev_notify_work(struct work_struct *_work)
1390 {
1391 struct slave *slave = container_of(_work, struct slave,
1392 notify_work.work);
1393
1394 if (rtnl_trylock()) {
1395 struct netdev_bonding_info binfo;
1396
1397 bond_fill_ifslave(slave, &binfo.slave);
1398 bond_fill_ifbond(slave->bond, &binfo.master);
1399 netdev_bonding_info_change(slave->dev, &binfo);
1400 rtnl_unlock();
1401 } else {
1402 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1403 }
1404 }
1405
1406 void bond_queue_slave_event(struct slave *slave)
1407 {
1408 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1409 }
1410
1411 void bond_lower_state_changed(struct slave *slave)
1412 {
1413 struct netdev_lag_lower_state_info info;
1414
1415 info.link_up = slave->link == BOND_LINK_UP ||
1416 slave->link == BOND_LINK_FAIL;
1417 info.tx_enabled = bond_is_active_slave(slave);
1418 netdev_lower_state_changed(slave->dev, &info);
1419 }
1420
1421 /* enslave device <slave> to bond device <master> */
1422 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1423 struct netlink_ext_ack *extack)
1424 {
1425 struct bonding *bond = netdev_priv(bond_dev);
1426 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1427 struct slave *new_slave = NULL, *prev_slave;
1428 struct sockaddr_storage ss;
1429 int link_reporting;
1430 int res = 0, i;
1431
1432 if (!bond->params.use_carrier &&
1433 slave_dev->ethtool_ops->get_link == NULL &&
1434 slave_ops->ndo_do_ioctl == NULL) {
1435 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1436 }
1437
1438 /* already in-use? */
1439 if (netdev_is_rx_handler_busy(slave_dev)) {
1440 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1441 slave_err(bond_dev, slave_dev,
1442 "Error: Device is in use and cannot be enslaved\n");
1443 return -EBUSY;
1444 }
1445
1446 if (bond_dev == slave_dev) {
1447 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1448 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1449 return -EPERM;
1450 }
1451
1452 /* vlan challenged mutual exclusion */
1453 /* no need to lock since we're protected by rtnl_lock */
1454 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1455 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1456 if (vlan_uses_dev(bond_dev)) {
1457 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1458 slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1459 return -EPERM;
1460 } else {
1461 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1462 }
1463 } else {
1464 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1465 }
1466
1467 /* Old ifenslave binaries are no longer supported. These can
1468 * be identified with moderate accuracy by the state of the slave:
1469 * the current ifenslave will set the interface down prior to
1470 * enslaving it; the old ifenslave will not.
1471 */
1472 if (slave_dev->flags & IFF_UP) {
1473 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1474 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1475 return -EPERM;
1476 }
1477
1478 /* set bonding device ether type by slave - bonding netdevices are
1479 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1480 * there is a need to override some of the type dependent attribs/funcs.
1481 *
1482 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1483 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1484 */
1485 if (!bond_has_slaves(bond)) {
1486 if (bond_dev->type != slave_dev->type) {
1487 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1488 bond_dev->type, slave_dev->type);
1489
1490 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1491 bond_dev);
1492 res = notifier_to_errno(res);
1493 if (res) {
1494 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1495 return -EBUSY;
1496 }
1497
1498 /* Flush unicast and multicast addresses */
1499 dev_uc_flush(bond_dev);
1500 dev_mc_flush(bond_dev);
1501
1502 if (slave_dev->type != ARPHRD_ETHER)
1503 bond_setup_by_slave(bond_dev, slave_dev);
1504 else {
1505 ether_setup(bond_dev);
1506 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1507 }
1508
1509 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1510 bond_dev);
1511 }
1512 } else if (bond_dev->type != slave_dev->type) {
1513 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1514 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1515 slave_dev->type, bond_dev->type);
1516 return -EINVAL;
1517 }
1518
1519 if (slave_dev->type == ARPHRD_INFINIBAND &&
1520 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1521 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1522 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1523 slave_dev->type);
1524 res = -EOPNOTSUPP;
1525 goto err_undo_flags;
1526 }
1527
1528 if (!slave_ops->ndo_set_mac_address ||
1529 slave_dev->type == ARPHRD_INFINIBAND) {
1530 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1531 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1532 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1533 if (!bond_has_slaves(bond)) {
1534 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1535 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1536 } else {
1537 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1538 slave_err(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1539 res = -EOPNOTSUPP;
1540 goto err_undo_flags;
1541 }
1542 }
1543 }
1544
1545 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1546
1547 /* If this is the first slave, then we need to set the master's hardware
1548 * address to be the same as the slave's.
1549 */
1550 if (!bond_has_slaves(bond) &&
1551 bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1552 res = bond_set_dev_addr(bond->dev, slave_dev);
1553 if (res)
1554 goto err_undo_flags;
1555 }
1556
1557 new_slave = bond_alloc_slave(bond);
1558 if (!new_slave) {
1559 res = -ENOMEM;
1560 goto err_undo_flags;
1561 }
1562
1563 new_slave->bond = bond;
1564 new_slave->dev = slave_dev;
1565 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1566 * is set via sysfs or module option if desired.
1567 */
1568 new_slave->queue_id = 0;
1569
1570 /* Save slave's original mtu and then set it to match the bond */
1571 new_slave->original_mtu = slave_dev->mtu;
1572 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1573 if (res) {
1574 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1575 goto err_free;
1576 }
1577
1578 /* Save slave's original ("permanent") mac address for modes
1579 * that need it, and for restoring it upon release, and then
1580 * set it to the master's address
1581 */
1582 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1583 slave_dev->addr_len);
1584
1585 if (!bond->params.fail_over_mac ||
1586 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1587 /* Set slave to master's mac address. The application already
1588 * set the master's mac address to that of the first slave
1589 */
1590 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1591 ss.ss_family = slave_dev->type;
1592 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1593 extack);
1594 if (res) {
1595 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1596 goto err_restore_mtu;
1597 }
1598 }
1599
1600 /* set slave flag before open to prevent IPv6 addrconf */
1601 slave_dev->flags |= IFF_SLAVE;
1602
1603 /* open the slave since the application closed it */
1604 res = dev_open(slave_dev, extack);
1605 if (res) {
1606 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1607 goto err_restore_mac;
1608 }
1609
1610 slave_dev->priv_flags |= IFF_BONDING;
1611 /* initialize slave stats */
1612 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1613
1614 if (bond_is_lb(bond)) {
1615 /* bond_alb_init_slave() must be called before all other stages since
1616 * it might fail and we do not want to have to undo everything
1617 */
1618 res = bond_alb_init_slave(bond, new_slave);
1619 if (res)
1620 goto err_close;
1621 }
1622
1623 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1624 if (res) {
1625 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1626 goto err_close;
1627 }
1628
1629 prev_slave = bond_last_slave(bond);
1630
1631 new_slave->delay = 0;
1632 new_slave->link_failure_count = 0;
1633
1634 if (bond_update_speed_duplex(new_slave) &&
1635 bond_needs_speed_duplex(bond))
1636 new_slave->link = BOND_LINK_DOWN;
1637
1638 new_slave->last_rx = jiffies -
1639 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1640 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1641 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1642
1643 if (bond->params.miimon && !bond->params.use_carrier) {
1644 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1645
1646 if ((link_reporting == -1) && !bond->params.arp_interval) {
1647 /* miimon is set but a bonded network driver
1648 * does not support ETHTOOL/MII and
1649 * arp_interval is not set. Note: if
1650 * use_carrier is enabled, we will never go
1651 * here (because netif_carrier is always
1652 * supported); thus, we don't need to change
1653 * the messages for netif_carrier.
1654 */
1655 slave_warn(bond_dev, slave_dev, "MII and ETHTOOL support not available for slave, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n");
1656 } else if (link_reporting == -1) {
1657 /* unable get link status using mii/ethtool */
1658 slave_warn(bond_dev, slave_dev, "can't get link status from slave; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n");
1659 }
1660 }
1661
1662 /* check for initial state */
1663 new_slave->link = BOND_LINK_NOCHANGE;
1664 if (bond->params.miimon) {
1665 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1666 if (bond->params.updelay) {
1667 bond_set_slave_link_state(new_slave,
1668 BOND_LINK_BACK,
1669 BOND_SLAVE_NOTIFY_NOW);
1670 new_slave->delay = bond->params.updelay;
1671 } else {
1672 bond_set_slave_link_state(new_slave,
1673 BOND_LINK_UP,
1674 BOND_SLAVE_NOTIFY_NOW);
1675 }
1676 } else {
1677 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1678 BOND_SLAVE_NOTIFY_NOW);
1679 }
1680 } else if (bond->params.arp_interval) {
1681 bond_set_slave_link_state(new_slave,
1682 (netif_carrier_ok(slave_dev) ?
1683 BOND_LINK_UP : BOND_LINK_DOWN),
1684 BOND_SLAVE_NOTIFY_NOW);
1685 } else {
1686 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1687 BOND_SLAVE_NOTIFY_NOW);
1688 }
1689
1690 if (new_slave->link != BOND_LINK_DOWN)
1691 new_slave->last_link_up = jiffies;
1692 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1693 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1694 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1695
1696 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1697 /* if there is a primary slave, remember it */
1698 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1699 rcu_assign_pointer(bond->primary_slave, new_slave);
1700 bond->force_primary = true;
1701 }
1702 }
1703
1704 switch (BOND_MODE(bond)) {
1705 case BOND_MODE_ACTIVEBACKUP:
1706 bond_set_slave_inactive_flags(new_slave,
1707 BOND_SLAVE_NOTIFY_NOW);
1708 break;
1709 case BOND_MODE_8023AD:
1710 /* in 802.3ad mode, the internal mechanism
1711 * will activate the slaves in the selected
1712 * aggregator
1713 */
1714 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1715 /* if this is the first slave */
1716 if (!prev_slave) {
1717 SLAVE_AD_INFO(new_slave)->id = 1;
1718 /* Initialize AD with the number of times that the AD timer is called in 1 second
1719 * can be called only after the mac address of the bond is set
1720 */
1721 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1722 } else {
1723 SLAVE_AD_INFO(new_slave)->id =
1724 SLAVE_AD_INFO(prev_slave)->id + 1;
1725 }
1726
1727 bond_3ad_bind_slave(new_slave);
1728 break;
1729 case BOND_MODE_TLB:
1730 case BOND_MODE_ALB:
1731 bond_set_active_slave(new_slave);
1732 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1733 break;
1734 default:
1735 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1736
1737 /* always active in trunk mode */
1738 bond_set_active_slave(new_slave);
1739
1740 /* In trunking mode there is little meaning to curr_active_slave
1741 * anyway (it holds no special properties of the bond device),
1742 * so we can change it without calling change_active_interface()
1743 */
1744 if (!rcu_access_pointer(bond->curr_active_slave) &&
1745 new_slave->link == BOND_LINK_UP)
1746 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1747
1748 break;
1749 } /* switch(bond_mode) */
1750
1751 #ifdef CONFIG_NET_POLL_CONTROLLER
1752 if (bond->dev->npinfo) {
1753 if (slave_enable_netpoll(new_slave)) {
1754 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1755 res = -EBUSY;
1756 goto err_detach;
1757 }
1758 }
1759 #endif
1760
1761 if (!(bond_dev->features & NETIF_F_LRO))
1762 dev_disable_lro(slave_dev);
1763
1764 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1765 new_slave);
1766 if (res) {
1767 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1768 goto err_detach;
1769 }
1770
1771 res = bond_master_upper_dev_link(bond, new_slave, extack);
1772 if (res) {
1773 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1774 goto err_unregister;
1775 }
1776
1777 res = bond_sysfs_slave_add(new_slave);
1778 if (res) {
1779 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1780 goto err_upper_unlink;
1781 }
1782
1783 /* If the mode uses primary, then the following is handled by
1784 * bond_change_active_slave().
1785 */
1786 if (!bond_uses_primary(bond)) {
1787 /* set promiscuity level to new slave */
1788 if (bond_dev->flags & IFF_PROMISC) {
1789 res = dev_set_promiscuity(slave_dev, 1);
1790 if (res)
1791 goto err_sysfs_del;
1792 }
1793
1794 /* set allmulti level to new slave */
1795 if (bond_dev->flags & IFF_ALLMULTI) {
1796 res = dev_set_allmulti(slave_dev, 1);
1797 if (res) {
1798 if (bond_dev->flags & IFF_PROMISC)
1799 dev_set_promiscuity(slave_dev, -1);
1800 goto err_sysfs_del;
1801 }
1802 }
1803
1804 netif_addr_lock_bh(bond_dev);
1805 dev_mc_sync_multiple(slave_dev, bond_dev);
1806 dev_uc_sync_multiple(slave_dev, bond_dev);
1807 netif_addr_unlock_bh(bond_dev);
1808
1809 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1810 /* add lacpdu mc addr to mc list */
1811 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1812
1813 dev_mc_add(slave_dev, lacpdu_multicast);
1814 }
1815 }
1816
1817 bond->slave_cnt++;
1818 bond_compute_features(bond);
1819 bond_set_carrier(bond);
1820
1821 if (bond_uses_primary(bond)) {
1822 block_netpoll_tx();
1823 bond_select_active_slave(bond);
1824 unblock_netpoll_tx();
1825 }
1826
1827 if (bond_mode_can_use_xmit_hash(bond))
1828 bond_update_slave_arr(bond, NULL);
1829
1830
1831 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1832 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1833 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1834
1835 /* enslave is successful */
1836 bond_queue_slave_event(new_slave);
1837 return 0;
1838
1839 /* Undo stages on error */
1840 err_sysfs_del:
1841 bond_sysfs_slave_del(new_slave);
1842
1843 err_upper_unlink:
1844 bond_upper_dev_unlink(bond, new_slave);
1845
1846 err_unregister:
1847 netdev_rx_handler_unregister(slave_dev);
1848
1849 err_detach:
1850 vlan_vids_del_by_dev(slave_dev, bond_dev);
1851 if (rcu_access_pointer(bond->primary_slave) == new_slave)
1852 RCU_INIT_POINTER(bond->primary_slave, NULL);
1853 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1854 block_netpoll_tx();
1855 bond_change_active_slave(bond, NULL);
1856 bond_select_active_slave(bond);
1857 unblock_netpoll_tx();
1858 }
1859 /* either primary_slave or curr_active_slave might've changed */
1860 synchronize_rcu();
1861 slave_disable_netpoll(new_slave);
1862
1863 err_close:
1864 if (!netif_is_bond_master(slave_dev))
1865 slave_dev->priv_flags &= ~IFF_BONDING;
1866 dev_close(slave_dev);
1867
1868 err_restore_mac:
1869 slave_dev->flags &= ~IFF_SLAVE;
1870 if (!bond->params.fail_over_mac ||
1871 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1872 /* XXX TODO - fom follow mode needs to change master's
1873 * MAC if this slave's MAC is in use by the bond, or at
1874 * least print a warning.
1875 */
1876 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
1877 new_slave->dev->addr_len);
1878 ss.ss_family = slave_dev->type;
1879 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
1880 }
1881
1882 err_restore_mtu:
1883 dev_set_mtu(slave_dev, new_slave->original_mtu);
1884
1885 err_free:
1886 bond_free_slave(new_slave);
1887
1888 err_undo_flags:
1889 /* Enslave of first slave has failed and we need to fix master's mac */
1890 if (!bond_has_slaves(bond)) {
1891 if (ether_addr_equal_64bits(bond_dev->dev_addr,
1892 slave_dev->dev_addr))
1893 eth_hw_addr_random(bond_dev);
1894 if (bond_dev->type != ARPHRD_ETHER) {
1895 dev_close(bond_dev);
1896 ether_setup(bond_dev);
1897 bond_dev->flags |= IFF_MASTER;
1898 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1899 }
1900 }
1901
1902 return res;
1903 }
1904
1905 /* Try to release the slave device <slave> from the bond device <master>
1906 * It is legal to access curr_active_slave without a lock because all the function
1907 * is RTNL-locked. If "all" is true it means that the function is being called
1908 * while destroying a bond interface and all slaves are being released.
1909 *
1910 * The rules for slave state should be:
1911 * for Active/Backup:
1912 * Active stays on all backups go down
1913 * for Bonded connections:
1914 * The first up interface should be left on and all others downed.
1915 */
1916 static int __bond_release_one(struct net_device *bond_dev,
1917 struct net_device *slave_dev,
1918 bool all, bool unregister)
1919 {
1920 struct bonding *bond = netdev_priv(bond_dev);
1921 struct slave *slave, *oldcurrent;
1922 struct sockaddr_storage ss;
1923 int old_flags = bond_dev->flags;
1924 netdev_features_t old_features = bond_dev->features;
1925
1926 /* slave is not a slave or master is not master of this slave */
1927 if (!(slave_dev->flags & IFF_SLAVE) ||
1928 !netdev_has_upper_dev(slave_dev, bond_dev)) {
1929 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
1930 return -EINVAL;
1931 }
1932
1933 block_netpoll_tx();
1934
1935 slave = bond_get_slave_by_dev(bond, slave_dev);
1936 if (!slave) {
1937 /* not a slave of this bond */
1938 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
1939 unblock_netpoll_tx();
1940 return -EINVAL;
1941 }
1942
1943 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
1944
1945 bond_sysfs_slave_del(slave);
1946
1947 /* recompute stats just before removing the slave */
1948 bond_get_stats(bond->dev, &bond->bond_stats);
1949
1950 bond_upper_dev_unlink(bond, slave);
1951 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1952 * for this slave anymore.
1953 */
1954 netdev_rx_handler_unregister(slave_dev);
1955
1956 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1957 bond_3ad_unbind_slave(slave);
1958
1959 if (bond_mode_can_use_xmit_hash(bond))
1960 bond_update_slave_arr(bond, slave);
1961
1962 slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
1963 bond_is_active_slave(slave) ? "active" : "backup");
1964
1965 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1966
1967 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1968
1969 if (!all && (!bond->params.fail_over_mac ||
1970 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1971 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1972 bond_has_slaves(bond))
1973 slave_warn(bond_dev, slave_dev, "the permanent HWaddr of slave - %pM - is still in use by bond - set the HWaddr of slave to a different address to avoid conflicts\n",
1974 slave->perm_hwaddr);
1975 }
1976
1977 if (rtnl_dereference(bond->primary_slave) == slave)
1978 RCU_INIT_POINTER(bond->primary_slave, NULL);
1979
1980 if (oldcurrent == slave)
1981 bond_change_active_slave(bond, NULL);
1982
1983 if (bond_is_lb(bond)) {
1984 /* Must be called only after the slave has been
1985 * detached from the list and the curr_active_slave
1986 * has been cleared (if our_slave == old_current),
1987 * but before a new active slave is selected.
1988 */
1989 bond_alb_deinit_slave(bond, slave);
1990 }
1991
1992 if (all) {
1993 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1994 } else if (oldcurrent == slave) {
1995 /* Note that we hold RTNL over this sequence, so there
1996 * is no concern that another slave add/remove event
1997 * will interfere.
1998 */
1999 bond_select_active_slave(bond);
2000 }
2001
2002 if (!bond_has_slaves(bond)) {
2003 bond_set_carrier(bond);
2004 eth_hw_addr_random(bond_dev);
2005 }
2006
2007 unblock_netpoll_tx();
2008 synchronize_rcu();
2009 bond->slave_cnt--;
2010
2011 if (!bond_has_slaves(bond)) {
2012 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2013 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2014 }
2015
2016 bond_compute_features(bond);
2017 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2018 (old_features & NETIF_F_VLAN_CHALLENGED))
2019 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2020
2021 vlan_vids_del_by_dev(slave_dev, bond_dev);
2022
2023 /* If the mode uses primary, then this case was handled above by
2024 * bond_change_active_slave(..., NULL)
2025 */
2026 if (!bond_uses_primary(bond)) {
2027 /* unset promiscuity level from slave
2028 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2029 * of the IFF_PROMISC flag in the bond_dev, but we need the
2030 * value of that flag before that change, as that was the value
2031 * when this slave was attached, so we cache at the start of the
2032 * function and use it here. Same goes for ALLMULTI below
2033 */
2034 if (old_flags & IFF_PROMISC)
2035 dev_set_promiscuity(slave_dev, -1);
2036
2037 /* unset allmulti level from slave */
2038 if (old_flags & IFF_ALLMULTI)
2039 dev_set_allmulti(slave_dev, -1);
2040
2041 bond_hw_addr_flush(bond_dev, slave_dev);
2042 }
2043
2044 slave_disable_netpoll(slave);
2045
2046 /* close slave before restoring its mac address */
2047 dev_close(slave_dev);
2048
2049 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2050 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2051 /* restore original ("permanent") mac address */
2052 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2053 slave->dev->addr_len);
2054 ss.ss_family = slave_dev->type;
2055 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2056 }
2057
2058 if (unregister)
2059 __dev_set_mtu(slave_dev, slave->original_mtu);
2060 else
2061 dev_set_mtu(slave_dev, slave->original_mtu);
2062
2063 if (!netif_is_bond_master(slave_dev))
2064 slave_dev->priv_flags &= ~IFF_BONDING;
2065
2066 bond_free_slave(slave);
2067
2068 return 0;
2069 }
2070
2071 /* A wrapper used because of ndo_del_link */
2072 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2073 {
2074 return __bond_release_one(bond_dev, slave_dev, false, false);
2075 }
2076
2077 /* First release a slave and then destroy the bond if no more slaves are left.
2078 * Must be under rtnl_lock when this function is called.
2079 */
2080 static int bond_release_and_destroy(struct net_device *bond_dev,
2081 struct net_device *slave_dev)
2082 {
2083 struct bonding *bond = netdev_priv(bond_dev);
2084 int ret;
2085
2086 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2087 if (ret == 0 && !bond_has_slaves(bond)) {
2088 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2089 netdev_info(bond_dev, "Destroying bond\n");
2090 bond_remove_proc_entry(bond);
2091 unregister_netdevice(bond_dev);
2092 }
2093 return ret;
2094 }
2095
2096 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2097 {
2098 struct bonding *bond = netdev_priv(bond_dev);
2099 bond_fill_ifbond(bond, info);
2100 }
2101
2102 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2103 {
2104 struct bonding *bond = netdev_priv(bond_dev);
2105 struct list_head *iter;
2106 int i = 0, res = -ENODEV;
2107 struct slave *slave;
2108
2109 bond_for_each_slave(bond, slave, iter) {
2110 if (i++ == (int)info->slave_id) {
2111 res = 0;
2112 bond_fill_ifslave(slave, info);
2113 break;
2114 }
2115 }
2116
2117 return res;
2118 }
2119
2120 /*-------------------------------- Monitoring -------------------------------*/
2121
2122 /* called with rcu_read_lock() */
2123 static int bond_miimon_inspect(struct bonding *bond)
2124 {
2125 int link_state, commit = 0;
2126 struct list_head *iter;
2127 struct slave *slave;
2128 bool ignore_updelay;
2129
2130 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2131
2132 bond_for_each_slave_rcu(bond, slave, iter) {
2133 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2134
2135 link_state = bond_check_dev_link(bond, slave->dev, 0);
2136
2137 switch (slave->link) {
2138 case BOND_LINK_UP:
2139 if (link_state)
2140 continue;
2141
2142 bond_propose_link_state(slave, BOND_LINK_FAIL);
2143 commit++;
2144 slave->delay = bond->params.downdelay;
2145 if (slave->delay) {
2146 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2147 (BOND_MODE(bond) ==
2148 BOND_MODE_ACTIVEBACKUP) ?
2149 (bond_is_active_slave(slave) ?
2150 "active " : "backup ") : "",
2151 bond->params.downdelay * bond->params.miimon);
2152 }
2153 /*FALLTHRU*/
2154 case BOND_LINK_FAIL:
2155 if (link_state) {
2156 /* recovered before downdelay expired */
2157 bond_propose_link_state(slave, BOND_LINK_UP);
2158 slave->last_link_up = jiffies;
2159 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2160 (bond->params.downdelay - slave->delay) *
2161 bond->params.miimon);
2162 commit++;
2163 continue;
2164 }
2165
2166 if (slave->delay <= 0) {
2167 bond_propose_link_state(slave, BOND_LINK_DOWN);
2168 commit++;
2169 continue;
2170 }
2171
2172 slave->delay--;
2173 break;
2174
2175 case BOND_LINK_DOWN:
2176 if (!link_state)
2177 continue;
2178
2179 bond_propose_link_state(slave, BOND_LINK_BACK);
2180 commit++;
2181 slave->delay = bond->params.updelay;
2182
2183 if (slave->delay) {
2184 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2185 ignore_updelay ? 0 :
2186 bond->params.updelay *
2187 bond->params.miimon);
2188 }
2189 /*FALLTHRU*/
2190 case BOND_LINK_BACK:
2191 if (!link_state) {
2192 bond_propose_link_state(slave, BOND_LINK_DOWN);
2193 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2194 (bond->params.updelay - slave->delay) *
2195 bond->params.miimon);
2196 commit++;
2197 continue;
2198 }
2199
2200 if (ignore_updelay)
2201 slave->delay = 0;
2202
2203 if (slave->delay <= 0) {
2204 bond_propose_link_state(slave, BOND_LINK_UP);
2205 commit++;
2206 ignore_updelay = false;
2207 continue;
2208 }
2209
2210 slave->delay--;
2211 break;
2212 }
2213 }
2214
2215 return commit;
2216 }
2217
2218 static void bond_miimon_link_change(struct bonding *bond,
2219 struct slave *slave,
2220 char link)
2221 {
2222 switch (BOND_MODE(bond)) {
2223 case BOND_MODE_8023AD:
2224 bond_3ad_handle_link_change(slave, link);
2225 break;
2226 case BOND_MODE_TLB:
2227 case BOND_MODE_ALB:
2228 bond_alb_handle_link_change(bond, slave, link);
2229 break;
2230 case BOND_MODE_XOR:
2231 bond_update_slave_arr(bond, NULL);
2232 break;
2233 }
2234 }
2235
2236 static void bond_miimon_commit(struct bonding *bond)
2237 {
2238 struct list_head *iter;
2239 struct slave *slave, *primary;
2240
2241 bond_for_each_slave(bond, slave, iter) {
2242 switch (slave->link_new_state) {
2243 case BOND_LINK_NOCHANGE:
2244 /* For 802.3ad mode, check current slave speed and
2245 * duplex again in case its port was disabled after
2246 * invalid speed/duplex reporting but recovered before
2247 * link monitoring could make a decision on the actual
2248 * link status
2249 */
2250 if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2251 slave->link == BOND_LINK_UP)
2252 bond_3ad_adapter_speed_duplex_changed(slave);
2253 continue;
2254
2255 case BOND_LINK_UP:
2256 if (bond_update_speed_duplex(slave) &&
2257 bond_needs_speed_duplex(bond)) {
2258 slave->link = BOND_LINK_DOWN;
2259 if (net_ratelimit())
2260 slave_warn(bond->dev, slave->dev,
2261 "failed to get link speed/duplex\n");
2262 continue;
2263 }
2264 bond_set_slave_link_state(slave, BOND_LINK_UP,
2265 BOND_SLAVE_NOTIFY_NOW);
2266 slave->last_link_up = jiffies;
2267
2268 primary = rtnl_dereference(bond->primary_slave);
2269 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2270 /* prevent it from being the active one */
2271 bond_set_backup_slave(slave);
2272 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2273 /* make it immediately active */
2274 bond_set_active_slave(slave);
2275 }
2276
2277 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2278 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2279 slave->duplex ? "full" : "half");
2280
2281 bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2282
2283 if (!bond->curr_active_slave || slave == primary)
2284 goto do_failover;
2285
2286 continue;
2287
2288 case BOND_LINK_DOWN:
2289 if (slave->link_failure_count < UINT_MAX)
2290 slave->link_failure_count++;
2291
2292 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2293 BOND_SLAVE_NOTIFY_NOW);
2294
2295 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2296 BOND_MODE(bond) == BOND_MODE_8023AD)
2297 bond_set_slave_inactive_flags(slave,
2298 BOND_SLAVE_NOTIFY_NOW);
2299
2300 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2301
2302 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2303
2304 if (slave == rcu_access_pointer(bond->curr_active_slave))
2305 goto do_failover;
2306
2307 continue;
2308
2309 default:
2310 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2311 slave->link_new_state);
2312 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2313
2314 continue;
2315 }
2316
2317 do_failover:
2318 block_netpoll_tx();
2319 bond_select_active_slave(bond);
2320 unblock_netpoll_tx();
2321 }
2322
2323 bond_set_carrier(bond);
2324 }
2325
2326 /* bond_mii_monitor
2327 *
2328 * Really a wrapper that splits the mii monitor into two phases: an
2329 * inspection, then (if inspection indicates something needs to be done)
2330 * an acquisition of appropriate locks followed by a commit phase to
2331 * implement whatever link state changes are indicated.
2332 */
2333 static void bond_mii_monitor(struct work_struct *work)
2334 {
2335 struct bonding *bond = container_of(work, struct bonding,
2336 mii_work.work);
2337 bool should_notify_peers = false;
2338 bool commit;
2339 unsigned long delay;
2340 struct slave *slave;
2341 struct list_head *iter;
2342
2343 delay = msecs_to_jiffies(bond->params.miimon);
2344
2345 if (!bond_has_slaves(bond))
2346 goto re_arm;
2347
2348 rcu_read_lock();
2349 should_notify_peers = bond_should_notify_peers(bond);
2350 commit = !!bond_miimon_inspect(bond);
2351 if (bond->send_peer_notif) {
2352 rcu_read_unlock();
2353 if (rtnl_trylock()) {
2354 bond->send_peer_notif--;
2355 rtnl_unlock();
2356 }
2357 } else {
2358 rcu_read_unlock();
2359 }
2360
2361 if (commit) {
2362 /* Race avoidance with bond_close cancel of workqueue */
2363 if (!rtnl_trylock()) {
2364 delay = 1;
2365 should_notify_peers = false;
2366 goto re_arm;
2367 }
2368
2369 bond_for_each_slave(bond, slave, iter) {
2370 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2371 }
2372 bond_miimon_commit(bond);
2373
2374 rtnl_unlock(); /* might sleep, hold no other locks */
2375 }
2376
2377 re_arm:
2378 if (bond->params.miimon)
2379 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2380
2381 if (should_notify_peers) {
2382 if (!rtnl_trylock())
2383 return;
2384 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2385 rtnl_unlock();
2386 }
2387 }
2388
2389 static int bond_upper_dev_walk(struct net_device *upper, void *data)
2390 {
2391 __be32 ip = *((__be32 *)data);
2392
2393 return ip == bond_confirm_addr(upper, 0, ip);
2394 }
2395
2396 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2397 {
2398 bool ret = false;
2399
2400 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2401 return true;
2402
2403 rcu_read_lock();
2404 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &ip))
2405 ret = true;
2406 rcu_read_unlock();
2407
2408 return ret;
2409 }
2410
2411 /* We go to the (large) trouble of VLAN tagging ARP frames because
2412 * switches in VLAN mode (especially if ports are configured as
2413 * "native" to a VLAN) might not pass non-tagged frames.
2414 */
2415 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2416 __be32 src_ip, struct bond_vlan_tag *tags)
2417 {
2418 struct sk_buff *skb;
2419 struct bond_vlan_tag *outer_tag = tags;
2420 struct net_device *slave_dev = slave->dev;
2421 struct net_device *bond_dev = slave->bond->dev;
2422
2423 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2424 arp_op, &dest_ip, &src_ip);
2425
2426 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2427 NULL, slave_dev->dev_addr, NULL);
2428
2429 if (!skb) {
2430 net_err_ratelimited("ARP packet allocation failed\n");
2431 return;
2432 }
2433
2434 if (!tags || tags->vlan_proto == VLAN_N_VID)
2435 goto xmit;
2436
2437 tags++;
2438
2439 /* Go through all the tags backwards and add them to the packet */
2440 while (tags->vlan_proto != VLAN_N_VID) {
2441 if (!tags->vlan_id) {
2442 tags++;
2443 continue;
2444 }
2445
2446 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2447 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2448 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2449 tags->vlan_id);
2450 if (!skb) {
2451 net_err_ratelimited("failed to insert inner VLAN tag\n");
2452 return;
2453 }
2454
2455 tags++;
2456 }
2457 /* Set the outer tag */
2458 if (outer_tag->vlan_id) {
2459 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2460 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2461 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2462 outer_tag->vlan_id);
2463 }
2464
2465 xmit:
2466 arp_xmit(skb);
2467 }
2468
2469 /* Validate the device path between the @start_dev and the @end_dev.
2470 * The path is valid if the @end_dev is reachable through device
2471 * stacking.
2472 * When the path is validated, collect any vlan information in the
2473 * path.
2474 */
2475 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2476 struct net_device *end_dev,
2477 int level)
2478 {
2479 struct bond_vlan_tag *tags;
2480 struct net_device *upper;
2481 struct list_head *iter;
2482
2483 if (start_dev == end_dev) {
2484 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2485 if (!tags)
2486 return ERR_PTR(-ENOMEM);
2487 tags[level].vlan_proto = VLAN_N_VID;
2488 return tags;
2489 }
2490
2491 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2492 tags = bond_verify_device_path(upper, end_dev, level + 1);
2493 if (IS_ERR_OR_NULL(tags)) {
2494 if (IS_ERR(tags))
2495 return tags;
2496 continue;
2497 }
2498 if (is_vlan_dev(upper)) {
2499 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2500 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2501 }
2502
2503 return tags;
2504 }
2505
2506 return NULL;
2507 }
2508
2509 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2510 {
2511 struct rtable *rt;
2512 struct bond_vlan_tag *tags;
2513 __be32 *targets = bond->params.arp_targets, addr;
2514 int i;
2515
2516 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2517 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2518 __func__, &targets[i]);
2519 tags = NULL;
2520
2521 /* Find out through which dev should the packet go */
2522 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2523 RTO_ONLINK, 0);
2524 if (IS_ERR(rt)) {
2525 /* there's no route to target - try to send arp
2526 * probe to generate any traffic (arp_validate=0)
2527 */
2528 if (bond->params.arp_validate)
2529 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2530 bond->dev->name,
2531 &targets[i]);
2532 bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2533 0, tags);
2534 continue;
2535 }
2536
2537 /* bond device itself */
2538 if (rt->dst.dev == bond->dev)
2539 goto found;
2540
2541 rcu_read_lock();
2542 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2543 rcu_read_unlock();
2544
2545 if (!IS_ERR_OR_NULL(tags))
2546 goto found;
2547
2548 /* Not our device - skip */
2549 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2550 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2551
2552 ip_rt_put(rt);
2553 continue;
2554
2555 found:
2556 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2557 ip_rt_put(rt);
2558 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2559 kfree(tags);
2560 }
2561 }
2562
2563 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2564 {
2565 int i;
2566
2567 if (!sip || !bond_has_this_ip(bond, tip)) {
2568 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2569 __func__, &sip, &tip);
2570 return;
2571 }
2572
2573 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2574 if (i == -1) {
2575 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2576 __func__, &sip);
2577 return;
2578 }
2579 slave->last_rx = jiffies;
2580 slave->target_last_arp_rx[i] = jiffies;
2581 }
2582
2583 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2584 struct slave *slave)
2585 {
2586 struct arphdr *arp = (struct arphdr *)skb->data;
2587 struct slave *curr_active_slave, *curr_arp_slave;
2588 unsigned char *arp_ptr;
2589 __be32 sip, tip;
2590 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2591 unsigned int alen;
2592
2593 if (!slave_do_arp_validate(bond, slave)) {
2594 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2595 !slave_do_arp_validate_only(bond))
2596 slave->last_rx = jiffies;
2597 return RX_HANDLER_ANOTHER;
2598 } else if (!is_arp) {
2599 return RX_HANDLER_ANOTHER;
2600 }
2601
2602 alen = arp_hdr_len(bond->dev);
2603
2604 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2605 __func__, skb->dev->name);
2606
2607 if (alen > skb_headlen(skb)) {
2608 arp = kmalloc(alen, GFP_ATOMIC);
2609 if (!arp)
2610 goto out_unlock;
2611 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2612 goto out_unlock;
2613 }
2614
2615 if (arp->ar_hln != bond->dev->addr_len ||
2616 skb->pkt_type == PACKET_OTHERHOST ||
2617 skb->pkt_type == PACKET_LOOPBACK ||
2618 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2619 arp->ar_pro != htons(ETH_P_IP) ||
2620 arp->ar_pln != 4)
2621 goto out_unlock;
2622
2623 arp_ptr = (unsigned char *)(arp + 1);
2624 arp_ptr += bond->dev->addr_len;
2625 memcpy(&sip, arp_ptr, 4);
2626 arp_ptr += 4 + bond->dev->addr_len;
2627 memcpy(&tip, arp_ptr, 4);
2628
2629 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2630 __func__, slave->dev->name, bond_slave_state(slave),
2631 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2632 &sip, &tip);
2633
2634 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2635 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2636
2637 /* We 'trust' the received ARP enough to validate it if:
2638 *
2639 * (a) the slave receiving the ARP is active (which includes the
2640 * current ARP slave, if any), or
2641 *
2642 * (b) the receiving slave isn't active, but there is a currently
2643 * active slave and it received valid arp reply(s) after it became
2644 * the currently active slave, or
2645 *
2646 * (c) there is an ARP slave that sent an ARP during the prior ARP
2647 * interval, and we receive an ARP reply on any slave. We accept
2648 * these because switch FDB update delays may deliver the ARP
2649 * reply to a slave other than the sender of the ARP request.
2650 *
2651 * Note: for (b), backup slaves are receiving the broadcast ARP
2652 * request, not a reply. This request passes from the sending
2653 * slave through the L2 switch(es) to the receiving slave. Since
2654 * this is checking the request, sip/tip are swapped for
2655 * validation.
2656 *
2657 * This is done to avoid endless looping when we can't reach the
2658 * arp_ip_target and fool ourselves with our own arp requests.
2659 */
2660 if (bond_is_active_slave(slave))
2661 bond_validate_arp(bond, slave, sip, tip);
2662 else if (curr_active_slave &&
2663 time_after(slave_last_rx(bond, curr_active_slave),
2664 curr_active_slave->last_link_up))
2665 bond_validate_arp(bond, slave, tip, sip);
2666 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2667 bond_time_in_interval(bond,
2668 dev_trans_start(curr_arp_slave->dev), 1))
2669 bond_validate_arp(bond, slave, sip, tip);
2670
2671 out_unlock:
2672 if (arp != (struct arphdr *)skb->data)
2673 kfree(arp);
2674 return RX_HANDLER_ANOTHER;
2675 }
2676
2677 /* function to verify if we're in the arp_interval timeslice, returns true if
2678 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2679 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2680 */
2681 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2682 int mod)
2683 {
2684 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2685
2686 return time_in_range(jiffies,
2687 last_act - delta_in_ticks,
2688 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2689 }
2690
2691 /* This function is called regularly to monitor each slave's link
2692 * ensuring that traffic is being sent and received when arp monitoring
2693 * is used in load-balancing mode. if the adapter has been dormant, then an
2694 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2695 * arp monitoring in active backup mode.
2696 */
2697 static void bond_loadbalance_arp_mon(struct bonding *bond)
2698 {
2699 struct slave *slave, *oldcurrent;
2700 struct list_head *iter;
2701 int do_failover = 0, slave_state_changed = 0;
2702
2703 if (!bond_has_slaves(bond))
2704 goto re_arm;
2705
2706 rcu_read_lock();
2707
2708 oldcurrent = rcu_dereference(bond->curr_active_slave);
2709 /* see if any of the previous devices are up now (i.e. they have
2710 * xmt and rcv traffic). the curr_active_slave does not come into
2711 * the picture unless it is null. also, slave->last_link_up is not
2712 * needed here because we send an arp on each slave and give a slave
2713 * as long as it needs to get the tx/rx within the delta.
2714 * TODO: what about up/down delay in arp mode? it wasn't here before
2715 * so it can wait
2716 */
2717 bond_for_each_slave_rcu(bond, slave, iter) {
2718 unsigned long trans_start = dev_trans_start(slave->dev);
2719
2720 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2721
2722 if (slave->link != BOND_LINK_UP) {
2723 if (bond_time_in_interval(bond, trans_start, 1) &&
2724 bond_time_in_interval(bond, slave->last_rx, 1)) {
2725
2726 bond_propose_link_state(slave, BOND_LINK_UP);
2727 slave_state_changed = 1;
2728
2729 /* primary_slave has no meaning in round-robin
2730 * mode. the window of a slave being up and
2731 * curr_active_slave being null after enslaving
2732 * is closed.
2733 */
2734 if (!oldcurrent) {
2735 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2736 do_failover = 1;
2737 } else {
2738 slave_info(bond->dev, slave->dev, "interface is now up\n");
2739 }
2740 }
2741 } else {
2742 /* slave->link == BOND_LINK_UP */
2743
2744 /* not all switches will respond to an arp request
2745 * when the source ip is 0, so don't take the link down
2746 * if we don't know our ip yet
2747 */
2748 if (!bond_time_in_interval(bond, trans_start, 2) ||
2749 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2750
2751 bond_propose_link_state(slave, BOND_LINK_DOWN);
2752 slave_state_changed = 1;
2753
2754 if (slave->link_failure_count < UINT_MAX)
2755 slave->link_failure_count++;
2756
2757 slave_info(bond->dev, slave->dev, "interface is now down\n");
2758
2759 if (slave == oldcurrent)
2760 do_failover = 1;
2761 }
2762 }
2763
2764 /* note: if switch is in round-robin mode, all links
2765 * must tx arp to ensure all links rx an arp - otherwise
2766 * links may oscillate or not come up at all; if switch is
2767 * in something like xor mode, there is nothing we can
2768 * do - all replies will be rx'ed on same link causing slaves
2769 * to be unstable during low/no traffic periods
2770 */
2771 if (bond_slave_is_up(slave))
2772 bond_arp_send_all(bond, slave);
2773 }
2774
2775 rcu_read_unlock();
2776
2777 if (do_failover || slave_state_changed) {
2778 if (!rtnl_trylock())
2779 goto re_arm;
2780
2781 bond_for_each_slave(bond, slave, iter) {
2782 if (slave->link_new_state != BOND_LINK_NOCHANGE)
2783 slave->link = slave->link_new_state;
2784 }
2785
2786 if (slave_state_changed) {
2787 bond_slave_state_change(bond);
2788 if (BOND_MODE(bond) == BOND_MODE_XOR)
2789 bond_update_slave_arr(bond, NULL);
2790 }
2791 if (do_failover) {
2792 block_netpoll_tx();
2793 bond_select_active_slave(bond);
2794 unblock_netpoll_tx();
2795 }
2796 rtnl_unlock();
2797 }
2798
2799 re_arm:
2800 if (bond->params.arp_interval)
2801 queue_delayed_work(bond->wq, &bond->arp_work,
2802 msecs_to_jiffies(bond->params.arp_interval));
2803 }
2804
2805 /* Called to inspect slaves for active-backup mode ARP monitor link state
2806 * changes. Sets proposed link state in slaves to specify what action
2807 * should take place for the slave. Returns 0 if no changes are found, >0
2808 * if changes to link states must be committed.
2809 *
2810 * Called with rcu_read_lock held.
2811 */
2812 static int bond_ab_arp_inspect(struct bonding *bond)
2813 {
2814 unsigned long trans_start, last_rx;
2815 struct list_head *iter;
2816 struct slave *slave;
2817 int commit = 0;
2818
2819 bond_for_each_slave_rcu(bond, slave, iter) {
2820 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2821 last_rx = slave_last_rx(bond, slave);
2822
2823 if (slave->link != BOND_LINK_UP) {
2824 if (bond_time_in_interval(bond, last_rx, 1)) {
2825 bond_propose_link_state(slave, BOND_LINK_UP);
2826 commit++;
2827 }
2828 continue;
2829 }
2830
2831 /* Give slaves 2*delta after being enslaved or made
2832 * active. This avoids bouncing, as the last receive
2833 * times need a full ARP monitor cycle to be updated.
2834 */
2835 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2836 continue;
2837
2838 /* Backup slave is down if:
2839 * - No current_arp_slave AND
2840 * - more than 3*delta since last receive AND
2841 * - the bond has an IP address
2842 *
2843 * Note: a non-null current_arp_slave indicates
2844 * the curr_active_slave went down and we are
2845 * searching for a new one; under this condition
2846 * we only take the curr_active_slave down - this
2847 * gives each slave a chance to tx/rx traffic
2848 * before being taken out
2849 */
2850 if (!bond_is_active_slave(slave) &&
2851 !rcu_access_pointer(bond->current_arp_slave) &&
2852 !bond_time_in_interval(bond, last_rx, 3)) {
2853 bond_propose_link_state(slave, BOND_LINK_DOWN);
2854 commit++;
2855 }
2856
2857 /* Active slave is down if:
2858 * - more than 2*delta since transmitting OR
2859 * - (more than 2*delta since receive AND
2860 * the bond has an IP address)
2861 */
2862 trans_start = dev_trans_start(slave->dev);
2863 if (bond_is_active_slave(slave) &&
2864 (!bond_time_in_interval(bond, trans_start, 2) ||
2865 !bond_time_in_interval(bond, last_rx, 2))) {
2866 bond_propose_link_state(slave, BOND_LINK_DOWN);
2867 commit++;
2868 }
2869 }
2870
2871 return commit;
2872 }
2873
2874 /* Called to commit link state changes noted by inspection step of
2875 * active-backup mode ARP monitor.
2876 *
2877 * Called with RTNL hold.
2878 */
2879 static void bond_ab_arp_commit(struct bonding *bond)
2880 {
2881 unsigned long trans_start;
2882 struct list_head *iter;
2883 struct slave *slave;
2884
2885 bond_for_each_slave(bond, slave, iter) {
2886 switch (slave->link_new_state) {
2887 case BOND_LINK_NOCHANGE:
2888 continue;
2889
2890 case BOND_LINK_UP:
2891 trans_start = dev_trans_start(slave->dev);
2892 if (rtnl_dereference(bond->curr_active_slave) != slave ||
2893 (!rtnl_dereference(bond->curr_active_slave) &&
2894 bond_time_in_interval(bond, trans_start, 1))) {
2895 struct slave *current_arp_slave;
2896
2897 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2898 bond_set_slave_link_state(slave, BOND_LINK_UP,
2899 BOND_SLAVE_NOTIFY_NOW);
2900 if (current_arp_slave) {
2901 bond_set_slave_inactive_flags(
2902 current_arp_slave,
2903 BOND_SLAVE_NOTIFY_NOW);
2904 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2905 }
2906
2907 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2908
2909 if (!rtnl_dereference(bond->curr_active_slave) ||
2910 slave == rtnl_dereference(bond->primary_slave))
2911 goto do_failover;
2912
2913 }
2914
2915 continue;
2916
2917 case BOND_LINK_DOWN:
2918 if (slave->link_failure_count < UINT_MAX)
2919 slave->link_failure_count++;
2920
2921 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2922 BOND_SLAVE_NOTIFY_NOW);
2923 bond_set_slave_inactive_flags(slave,
2924 BOND_SLAVE_NOTIFY_NOW);
2925
2926 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2927
2928 if (slave == rtnl_dereference(bond->curr_active_slave)) {
2929 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2930 goto do_failover;
2931 }
2932
2933 continue;
2934
2935 default:
2936 slave_err(bond->dev, slave->dev,
2937 "impossible: link_new_state %d on slave\n",
2938 slave->link_new_state);
2939 continue;
2940 }
2941
2942 do_failover:
2943 block_netpoll_tx();
2944 bond_select_active_slave(bond);
2945 unblock_netpoll_tx();
2946 }
2947
2948 bond_set_carrier(bond);
2949 }
2950
2951 /* Send ARP probes for active-backup mode ARP monitor.
2952 *
2953 * Called with rcu_read_lock held.
2954 */
2955 static bool bond_ab_arp_probe(struct bonding *bond)
2956 {
2957 struct slave *slave, *before = NULL, *new_slave = NULL,
2958 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2959 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2960 struct list_head *iter;
2961 bool found = false;
2962 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2963
2964 if (curr_arp_slave && curr_active_slave)
2965 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2966 curr_arp_slave->dev->name,
2967 curr_active_slave->dev->name);
2968
2969 if (curr_active_slave) {
2970 bond_arp_send_all(bond, curr_active_slave);
2971 return should_notify_rtnl;
2972 }
2973
2974 /* if we don't have a curr_active_slave, search for the next available
2975 * backup slave from the current_arp_slave and make it the candidate
2976 * for becoming the curr_active_slave
2977 */
2978
2979 if (!curr_arp_slave) {
2980 curr_arp_slave = bond_first_slave_rcu(bond);
2981 if (!curr_arp_slave)
2982 return should_notify_rtnl;
2983 }
2984
2985 bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2986
2987 bond_for_each_slave_rcu(bond, slave, iter) {
2988 if (!found && !before && bond_slave_is_up(slave))
2989 before = slave;
2990
2991 if (found && !new_slave && bond_slave_is_up(slave))
2992 new_slave = slave;
2993 /* if the link state is up at this point, we
2994 * mark it down - this can happen if we have
2995 * simultaneous link failures and
2996 * reselect_active_interface doesn't make this
2997 * one the current slave so it is still marked
2998 * up when it is actually down
2999 */
3000 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3001 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3002 BOND_SLAVE_NOTIFY_LATER);
3003 if (slave->link_failure_count < UINT_MAX)
3004 slave->link_failure_count++;
3005
3006 bond_set_slave_inactive_flags(slave,
3007 BOND_SLAVE_NOTIFY_LATER);
3008
3009 slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3010 }
3011 if (slave == curr_arp_slave)
3012 found = true;
3013 }
3014
3015 if (!new_slave && before)
3016 new_slave = before;
3017
3018 if (!new_slave)
3019 goto check_state;
3020
3021 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3022 BOND_SLAVE_NOTIFY_LATER);
3023 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3024 bond_arp_send_all(bond, new_slave);
3025 new_slave->last_link_up = jiffies;
3026 rcu_assign_pointer(bond->current_arp_slave, new_slave);
3027
3028 check_state:
3029 bond_for_each_slave_rcu(bond, slave, iter) {
3030 if (slave->should_notify || slave->should_notify_link) {
3031 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3032 break;
3033 }
3034 }
3035 return should_notify_rtnl;
3036 }
3037
3038 static void bond_activebackup_arp_mon(struct bonding *bond)
3039 {
3040 bool should_notify_peers = false;
3041 bool should_notify_rtnl = false;
3042 int delta_in_ticks;
3043
3044 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3045
3046 if (!bond_has_slaves(bond))
3047 goto re_arm;
3048
3049 rcu_read_lock();
3050
3051 should_notify_peers = bond_should_notify_peers(bond);
3052
3053 if (bond_ab_arp_inspect(bond)) {
3054 rcu_read_unlock();
3055
3056 /* Race avoidance with bond_close flush of workqueue */
3057 if (!rtnl_trylock()) {
3058 delta_in_ticks = 1;
3059 should_notify_peers = false;
3060 goto re_arm;
3061 }
3062
3063 bond_ab_arp_commit(bond);
3064
3065 rtnl_unlock();
3066 rcu_read_lock();
3067 }
3068
3069 should_notify_rtnl = bond_ab_arp_probe(bond);
3070 rcu_read_unlock();
3071
3072 re_arm:
3073 if (bond->params.arp_interval)
3074 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3075
3076 if (should_notify_peers || should_notify_rtnl) {
3077 if (!rtnl_trylock())
3078 return;
3079
3080 if (should_notify_peers)
3081 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3082 bond->dev);
3083 if (should_notify_rtnl) {
3084 bond_slave_state_notify(bond);
3085 bond_slave_link_notify(bond);
3086 }
3087
3088 rtnl_unlock();
3089 }
3090 }
3091
3092 static void bond_arp_monitor(struct work_struct *work)
3093 {
3094 struct bonding *bond = container_of(work, struct bonding,
3095 arp_work.work);
3096
3097 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3098 bond_activebackup_arp_mon(bond);
3099 else
3100 bond_loadbalance_arp_mon(bond);
3101 }
3102
3103 /*-------------------------- netdev event handling --------------------------*/
3104
3105 /* Change device name */
3106 static int bond_event_changename(struct bonding *bond)
3107 {
3108 bond_remove_proc_entry(bond);
3109 bond_create_proc_entry(bond);
3110
3111 bond_debug_reregister(bond);
3112
3113 return NOTIFY_DONE;
3114 }
3115
3116 static int bond_master_netdev_event(unsigned long event,
3117 struct net_device *bond_dev)
3118 {
3119 struct bonding *event_bond = netdev_priv(bond_dev);
3120
3121 netdev_dbg(bond_dev, "%s called\n", __func__);
3122
3123 switch (event) {
3124 case NETDEV_CHANGENAME:
3125 return bond_event_changename(event_bond);
3126 case NETDEV_UNREGISTER:
3127 bond_remove_proc_entry(event_bond);
3128 break;
3129 case NETDEV_REGISTER:
3130 bond_create_proc_entry(event_bond);
3131 break;
3132 default:
3133 break;
3134 }
3135
3136 return NOTIFY_DONE;
3137 }
3138
3139 static int bond_slave_netdev_event(unsigned long event,
3140 struct net_device *slave_dev)
3141 {
3142 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3143 struct bonding *bond;
3144 struct net_device *bond_dev;
3145
3146 /* A netdev event can be generated while enslaving a device
3147 * before netdev_rx_handler_register is called in which case
3148 * slave will be NULL
3149 */
3150 if (!slave) {
3151 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3152 return NOTIFY_DONE;
3153 }
3154
3155 bond_dev = slave->bond->dev;
3156 bond = slave->bond;
3157 primary = rtnl_dereference(bond->primary_slave);
3158
3159 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3160
3161 switch (event) {
3162 case NETDEV_UNREGISTER:
3163 if (bond_dev->type != ARPHRD_ETHER)
3164 bond_release_and_destroy(bond_dev, slave_dev);
3165 else
3166 __bond_release_one(bond_dev, slave_dev, false, true);
3167 break;
3168 case NETDEV_UP:
3169 case NETDEV_CHANGE:
3170 /* For 802.3ad mode only:
3171 * Getting invalid Speed/Duplex values here will put slave
3172 * in weird state. Mark it as link-fail if the link was
3173 * previously up or link-down if it hasn't yet come up, and
3174 * let link-monitoring (miimon) set it right when correct
3175 * speeds/duplex are available.
3176 */
3177 if (bond_update_speed_duplex(slave) &&
3178 BOND_MODE(bond) == BOND_MODE_8023AD) {
3179 if (slave->last_link_up)
3180 slave->link = BOND_LINK_FAIL;
3181 else
3182 slave->link = BOND_LINK_DOWN;
3183 }
3184
3185 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3186 bond_3ad_adapter_speed_duplex_changed(slave);
3187 /* Fallthrough */
3188 case NETDEV_DOWN:
3189 /* Refresh slave-array if applicable!
3190 * If the setup does not use miimon or arpmon (mode-specific!),
3191 * then these events will not cause the slave-array to be
3192 * refreshed. This will cause xmit to use a slave that is not
3193 * usable. Avoid such situation by refeshing the array at these
3194 * events. If these (miimon/arpmon) parameters are configured
3195 * then array gets refreshed twice and that should be fine!
3196 */
3197 if (bond_mode_can_use_xmit_hash(bond))
3198 bond_update_slave_arr(bond, NULL);
3199 break;
3200 case NETDEV_CHANGEMTU:
3201 /* TODO: Should slaves be allowed to
3202 * independently alter their MTU? For
3203 * an active-backup bond, slaves need
3204 * not be the same type of device, so
3205 * MTUs may vary. For other modes,
3206 * slaves arguably should have the
3207 * same MTUs. To do this, we'd need to
3208 * take over the slave's change_mtu
3209 * function for the duration of their
3210 * servitude.
3211 */
3212 break;
3213 case NETDEV_CHANGENAME:
3214 /* we don't care if we don't have primary set */
3215 if (!bond_uses_primary(bond) ||
3216 !bond->params.primary[0])
3217 break;
3218
3219 if (slave == primary) {
3220 /* slave's name changed - he's no longer primary */
3221 RCU_INIT_POINTER(bond->primary_slave, NULL);
3222 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3223 /* we have a new primary slave */
3224 rcu_assign_pointer(bond->primary_slave, slave);
3225 } else { /* we didn't change primary - exit */
3226 break;
3227 }
3228
3229 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3230 primary ? slave_dev->name : "none");
3231
3232 block_netpoll_tx();
3233 bond_select_active_slave(bond);
3234 unblock_netpoll_tx();
3235 break;
3236 case NETDEV_FEAT_CHANGE:
3237 bond_compute_features(bond);
3238 break;
3239 case NETDEV_RESEND_IGMP:
3240 /* Propagate to master device */
3241 call_netdevice_notifiers(event, slave->bond->dev);
3242 break;
3243 default:
3244 break;
3245 }
3246
3247 return NOTIFY_DONE;
3248 }
3249
3250 /* bond_netdev_event: handle netdev notifier chain events.
3251 *
3252 * This function receives events for the netdev chain. The caller (an
3253 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3254 * locks for us to safely manipulate the slave devices (RTNL lock,
3255 * dev_probe_lock).
3256 */
3257 static int bond_netdev_event(struct notifier_block *this,
3258 unsigned long event, void *ptr)
3259 {
3260 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3261
3262 netdev_dbg(event_dev, "%s received %s\n",
3263 __func__, netdev_cmd_to_name(event));
3264
3265 if (!(event_dev->priv_flags & IFF_BONDING))
3266 return NOTIFY_DONE;
3267
3268 if (event_dev->flags & IFF_MASTER) {
3269 int ret;
3270
3271 ret = bond_master_netdev_event(event, event_dev);
3272 if (ret != NOTIFY_DONE)
3273 return ret;
3274 }
3275
3276 if (event_dev->flags & IFF_SLAVE)
3277 return bond_slave_netdev_event(event, event_dev);
3278
3279 return NOTIFY_DONE;
3280 }
3281
3282 static struct notifier_block bond_netdev_notifier = {
3283 .notifier_call = bond_netdev_event,
3284 };
3285
3286 /*---------------------------- Hashing Policies -----------------------------*/
3287
3288 /* L2 hash helper */
3289 static inline u32 bond_eth_hash(struct sk_buff *skb)
3290 {
3291 struct ethhdr *ep, hdr_tmp;
3292
3293 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3294 if (ep)
3295 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3296 return 0;
3297 }
3298
3299 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3300 int *noff, int *proto, bool l34)
3301 {
3302 const struct ipv6hdr *iph6;
3303 const struct iphdr *iph;
3304
3305 if (skb->protocol == htons(ETH_P_IP)) {
3306 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3307 return false;
3308 iph = (const struct iphdr *)(skb->data + *noff);
3309 iph_to_flow_copy_v4addrs(fk, iph);
3310 *noff += iph->ihl << 2;
3311 if (!ip_is_fragment(iph))
3312 *proto = iph->protocol;
3313 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3314 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3315 return false;
3316 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3317 iph_to_flow_copy_v6addrs(fk, iph6);
3318 *noff += sizeof(*iph6);
3319 *proto = iph6->nexthdr;
3320 } else {
3321 return false;
3322 }
3323
3324 if (l34 && *proto >= 0)
3325 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3326
3327 return true;
3328 }
3329
3330 /* Extract the appropriate headers based on bond's xmit policy */
3331 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3332 struct flow_keys *fk)
3333 {
3334 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3335 int noff, proto = -1;
3336
3337 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3338 memset(fk, 0, sizeof(*fk));
3339 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3340 fk, NULL, 0, 0, 0, 0);
3341 }
3342
3343 fk->ports.ports = 0;
3344 memset(&fk->icmp, 0, sizeof(fk->icmp));
3345 noff = skb_network_offset(skb);
3346 if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3347 return false;
3348
3349 /* ICMP error packets contains at least 8 bytes of the header
3350 * of the packet which generated the error. Use this information
3351 * to correlate ICMP error packets within the same flow which
3352 * generated the error.
3353 */
3354 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3355 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3356 skb_transport_offset(skb),
3357 skb_headlen(skb));
3358 if (proto == IPPROTO_ICMP) {
3359 if (!icmp_is_err(fk->icmp.type))
3360 return true;
3361
3362 noff += sizeof(struct icmphdr);
3363 } else if (proto == IPPROTO_ICMPV6) {
3364 if (!icmpv6_is_err(fk->icmp.type))
3365 return true;
3366
3367 noff += sizeof(struct icmp6hdr);
3368 }
3369 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3370 }
3371
3372 return true;
3373 }
3374
3375 /**
3376 * bond_xmit_hash - generate a hash value based on the xmit policy
3377 * @bond: bonding device
3378 * @skb: buffer to use for headers
3379 *
3380 * This function will extract the necessary headers from the skb buffer and use
3381 * them to generate a hash based on the xmit_policy set in the bonding device
3382 */
3383 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3384 {
3385 struct flow_keys flow;
3386 u32 hash;
3387
3388 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3389 skb->l4_hash)
3390 return skb->hash;
3391
3392 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3393 !bond_flow_dissect(bond, skb, &flow))
3394 return bond_eth_hash(skb);
3395
3396 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3397 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3398 hash = bond_eth_hash(skb);
3399 } else {
3400 if (flow.icmp.id)
3401 memcpy(&hash, &flow.icmp, sizeof(hash));
3402 else
3403 memcpy(&hash, &flow.ports.ports, sizeof(hash));
3404 }
3405 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3406 (__force u32)flow_get_u32_src(&flow);
3407 hash ^= (hash >> 16);
3408 hash ^= (hash >> 8);
3409
3410 return hash >> 1;
3411 }
3412
3413 /*-------------------------- Device entry points ----------------------------*/
3414
3415 void bond_work_init_all(struct bonding *bond)
3416 {
3417 INIT_DELAYED_WORK(&bond->mcast_work,
3418 bond_resend_igmp_join_requests_delayed);
3419 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3420 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3421 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3422 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3423 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3424 }
3425
3426 static void bond_work_cancel_all(struct bonding *bond)
3427 {
3428 cancel_delayed_work_sync(&bond->mii_work);
3429 cancel_delayed_work_sync(&bond->arp_work);
3430 cancel_delayed_work_sync(&bond->alb_work);
3431 cancel_delayed_work_sync(&bond->ad_work);
3432 cancel_delayed_work_sync(&bond->mcast_work);
3433 cancel_delayed_work_sync(&bond->slave_arr_work);
3434 }
3435
3436 static int bond_open(struct net_device *bond_dev)
3437 {
3438 struct bonding *bond = netdev_priv(bond_dev);
3439 struct list_head *iter;
3440 struct slave *slave;
3441
3442 /* reset slave->backup and slave->inactive */
3443 if (bond_has_slaves(bond)) {
3444 bond_for_each_slave(bond, slave, iter) {
3445 if (bond_uses_primary(bond) &&
3446 slave != rcu_access_pointer(bond->curr_active_slave)) {
3447 bond_set_slave_inactive_flags(slave,
3448 BOND_SLAVE_NOTIFY_NOW);
3449 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3450 bond_set_slave_active_flags(slave,
3451 BOND_SLAVE_NOTIFY_NOW);
3452 }
3453 }
3454 }
3455
3456 if (bond_is_lb(bond)) {
3457 /* bond_alb_initialize must be called before the timer
3458 * is started.
3459 */
3460 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3461 return -ENOMEM;
3462 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3463 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3464 }
3465
3466 if (bond->params.miimon) /* link check interval, in milliseconds. */
3467 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3468
3469 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3470 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3471 bond->recv_probe = bond_arp_rcv;
3472 }
3473
3474 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3475 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3476 /* register to receive LACPDUs */
3477 bond->recv_probe = bond_3ad_lacpdu_recv;
3478 bond_3ad_initiate_agg_selection(bond, 1);
3479 }
3480
3481 if (bond_mode_can_use_xmit_hash(bond))
3482 bond_update_slave_arr(bond, NULL);
3483
3484 return 0;
3485 }
3486
3487 static int bond_close(struct net_device *bond_dev)
3488 {
3489 struct bonding *bond = netdev_priv(bond_dev);
3490
3491 bond_work_cancel_all(bond);
3492 bond->send_peer_notif = 0;
3493 if (bond_is_lb(bond))
3494 bond_alb_deinitialize(bond);
3495 bond->recv_probe = NULL;
3496
3497 return 0;
3498 }
3499
3500 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3501 * that some drivers can provide 32bit values only.
3502 */
3503 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3504 const struct rtnl_link_stats64 *_new,
3505 const struct rtnl_link_stats64 *_old)
3506 {
3507 const u64 *new = (const u64 *)_new;
3508 const u64 *old = (const u64 *)_old;
3509 u64 *res = (u64 *)_res;
3510 int i;
3511
3512 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3513 u64 nv = new[i];
3514 u64 ov = old[i];
3515 s64 delta = nv - ov;
3516
3517 /* detects if this particular field is 32bit only */
3518 if (((nv | ov) >> 32) == 0)
3519 delta = (s64)(s32)((u32)nv - (u32)ov);
3520
3521 /* filter anomalies, some drivers reset their stats
3522 * at down/up events.
3523 */
3524 if (delta > 0)
3525 res[i] += delta;
3526 }
3527 }
3528
3529 #ifdef CONFIG_LOCKDEP
3530 static int bond_get_lowest_level_rcu(struct net_device *dev)
3531 {
3532 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3533 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3534 int cur = 0, max = 0;
3535
3536 now = dev;
3537 iter = &dev->adj_list.lower;
3538
3539 while (1) {
3540 next = NULL;
3541 while (1) {
3542 ldev = netdev_next_lower_dev_rcu(now, &iter);
3543 if (!ldev)
3544 break;
3545
3546 next = ldev;
3547 niter = &ldev->adj_list.lower;
3548 dev_stack[cur] = now;
3549 iter_stack[cur++] = iter;
3550 if (max <= cur)
3551 max = cur;
3552 break;
3553 }
3554
3555 if (!next) {
3556 if (!cur)
3557 return max;
3558 next = dev_stack[--cur];
3559 niter = iter_stack[cur];
3560 }
3561
3562 now = next;
3563 iter = niter;
3564 }
3565
3566 return max;
3567 }
3568 #endif
3569
3570 static void bond_get_stats(struct net_device *bond_dev,
3571 struct rtnl_link_stats64 *stats)
3572 {
3573 struct bonding *bond = netdev_priv(bond_dev);
3574 struct rtnl_link_stats64 temp;
3575 struct list_head *iter;
3576 struct slave *slave;
3577 int nest_level = 0;
3578
3579
3580 rcu_read_lock();
3581 #ifdef CONFIG_LOCKDEP
3582 nest_level = bond_get_lowest_level_rcu(bond_dev);
3583 #endif
3584
3585 spin_lock_nested(&bond->stats_lock, nest_level);
3586 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3587
3588 bond_for_each_slave_rcu(bond, slave, iter) {
3589 const struct rtnl_link_stats64 *new =
3590 dev_get_stats(slave->dev, &temp);
3591
3592 bond_fold_stats(stats, new, &slave->slave_stats);
3593
3594 /* save off the slave stats for the next run */
3595 memcpy(&slave->slave_stats, new, sizeof(*new));
3596 }
3597
3598 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3599 spin_unlock(&bond->stats_lock);
3600 rcu_read_unlock();
3601 }
3602
3603 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3604 {
3605 struct bonding *bond = netdev_priv(bond_dev);
3606 struct net_device *slave_dev = NULL;
3607 struct ifbond k_binfo;
3608 struct ifbond __user *u_binfo = NULL;
3609 struct ifslave k_sinfo;
3610 struct ifslave __user *u_sinfo = NULL;
3611 struct mii_ioctl_data *mii = NULL;
3612 struct bond_opt_value newval;
3613 struct net *net;
3614 int res = 0;
3615
3616 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3617
3618 switch (cmd) {
3619 case SIOCGMIIPHY:
3620 mii = if_mii(ifr);
3621 if (!mii)
3622 return -EINVAL;
3623
3624 mii->phy_id = 0;
3625 /* Fall Through */
3626 case SIOCGMIIREG:
3627 /* We do this again just in case we were called by SIOCGMIIREG
3628 * instead of SIOCGMIIPHY.
3629 */
3630 mii = if_mii(ifr);
3631 if (!mii)
3632 return -EINVAL;
3633
3634 if (mii->reg_num == 1) {
3635 mii->val_out = 0;
3636 if (netif_carrier_ok(bond->dev))
3637 mii->val_out = BMSR_LSTATUS;
3638 }
3639
3640 return 0;
3641 case BOND_INFO_QUERY_OLD:
3642 case SIOCBONDINFOQUERY:
3643 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3644
3645 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3646 return -EFAULT;
3647
3648 bond_info_query(bond_dev, &k_binfo);
3649 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3650 return -EFAULT;
3651
3652 return 0;
3653 case BOND_SLAVE_INFO_QUERY_OLD:
3654 case SIOCBONDSLAVEINFOQUERY:
3655 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3656
3657 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3658 return -EFAULT;
3659
3660 res = bond_slave_info_query(bond_dev, &k_sinfo);
3661 if (res == 0 &&
3662 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3663 return -EFAULT;
3664
3665 return res;
3666 default:
3667 break;
3668 }
3669
3670 net = dev_net(bond_dev);
3671
3672 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3673 return -EPERM;
3674
3675 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3676
3677 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3678
3679 if (!slave_dev)
3680 return -ENODEV;
3681
3682 switch (cmd) {
3683 case BOND_ENSLAVE_OLD:
3684 case SIOCBONDENSLAVE:
3685 res = bond_enslave(bond_dev, slave_dev, NULL);
3686 break;
3687 case BOND_RELEASE_OLD:
3688 case SIOCBONDRELEASE:
3689 res = bond_release(bond_dev, slave_dev);
3690 if (!res)
3691 netdev_update_lockdep_key(slave_dev);
3692 break;
3693 case BOND_SETHWADDR_OLD:
3694 case SIOCBONDSETHWADDR:
3695 res = bond_set_dev_addr(bond_dev, slave_dev);
3696 break;
3697 case BOND_CHANGE_ACTIVE_OLD:
3698 case SIOCBONDCHANGEACTIVE:
3699 bond_opt_initstr(&newval, slave_dev->name);
3700 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3701 &newval);
3702 break;
3703 default:
3704 res = -EOPNOTSUPP;
3705 }
3706
3707 return res;
3708 }
3709
3710 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3711 {
3712 struct bonding *bond = netdev_priv(bond_dev);
3713
3714 if (change & IFF_PROMISC)
3715 bond_set_promiscuity(bond,
3716 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3717
3718 if (change & IFF_ALLMULTI)
3719 bond_set_allmulti(bond,
3720 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3721 }
3722
3723 static void bond_set_rx_mode(struct net_device *bond_dev)
3724 {
3725 struct bonding *bond = netdev_priv(bond_dev);
3726 struct list_head *iter;
3727 struct slave *slave;
3728
3729 rcu_read_lock();
3730 if (bond_uses_primary(bond)) {
3731 slave = rcu_dereference(bond->curr_active_slave);
3732 if (slave) {
3733 dev_uc_sync(slave->dev, bond_dev);
3734 dev_mc_sync(slave->dev, bond_dev);
3735 }
3736 } else {
3737 bond_for_each_slave_rcu(bond, slave, iter) {
3738 dev_uc_sync_multiple(slave->dev, bond_dev);
3739 dev_mc_sync_multiple(slave->dev, bond_dev);
3740 }
3741 }
3742 rcu_read_unlock();
3743 }
3744
3745 static int bond_neigh_init(struct neighbour *n)
3746 {
3747 struct bonding *bond = netdev_priv(n->dev);
3748 const struct net_device_ops *slave_ops;
3749 struct neigh_parms parms;
3750 struct slave *slave;
3751 int ret = 0;
3752
3753 rcu_read_lock();
3754 slave = bond_first_slave_rcu(bond);
3755 if (!slave)
3756 goto out;
3757 slave_ops = slave->dev->netdev_ops;
3758 if (!slave_ops->ndo_neigh_setup)
3759 goto out;
3760
3761 /* TODO: find another way [1] to implement this.
3762 * Passing a zeroed structure is fragile,
3763 * but at least we do not pass garbage.
3764 *
3765 * [1] One way would be that ndo_neigh_setup() never touch
3766 * struct neigh_parms, but propagate the new neigh_setup()
3767 * back to ___neigh_create() / neigh_parms_alloc()
3768 */
3769 memset(&parms, 0, sizeof(parms));
3770 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3771
3772 if (ret)
3773 goto out;
3774
3775 if (parms.neigh_setup)
3776 ret = parms.neigh_setup(n);
3777 out:
3778 rcu_read_unlock();
3779 return ret;
3780 }
3781
3782 /* The bonding ndo_neigh_setup is called at init time beofre any
3783 * slave exists. So we must declare proxy setup function which will
3784 * be used at run time to resolve the actual slave neigh param setup.
3785 *
3786 * It's also called by master devices (such as vlans) to setup their
3787 * underlying devices. In that case - do nothing, we're already set up from
3788 * our init.
3789 */
3790 static int bond_neigh_setup(struct net_device *dev,
3791 struct neigh_parms *parms)
3792 {
3793 /* modify only our neigh_parms */
3794 if (parms->dev == dev)
3795 parms->neigh_setup = bond_neigh_init;
3796
3797 return 0;
3798 }
3799
3800 /* Change the MTU of all of a master's slaves to match the master */
3801 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3802 {
3803 struct bonding *bond = netdev_priv(bond_dev);
3804 struct slave *slave, *rollback_slave;
3805 struct list_head *iter;
3806 int res = 0;
3807
3808 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3809
3810 bond_for_each_slave(bond, slave, iter) {
3811 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3812 slave, slave->dev->netdev_ops->ndo_change_mtu);
3813
3814 res = dev_set_mtu(slave->dev, new_mtu);
3815
3816 if (res) {
3817 /* If we failed to set the slave's mtu to the new value
3818 * we must abort the operation even in ACTIVE_BACKUP
3819 * mode, because if we allow the backup slaves to have
3820 * different mtu values than the active slave we'll
3821 * need to change their mtu when doing a failover. That
3822 * means changing their mtu from timer context, which
3823 * is probably not a good idea.
3824 */
3825 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3826 res, new_mtu);
3827 goto unwind;
3828 }
3829 }
3830
3831 bond_dev->mtu = new_mtu;
3832
3833 return 0;
3834
3835 unwind:
3836 /* unwind from head to the slave that failed */
3837 bond_for_each_slave(bond, rollback_slave, iter) {
3838 int tmp_res;
3839
3840 if (rollback_slave == slave)
3841 break;
3842
3843 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3844 if (tmp_res)
3845 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
3846 tmp_res);
3847 }
3848
3849 return res;
3850 }
3851
3852 /* Change HW address
3853 *
3854 * Note that many devices must be down to change the HW address, and
3855 * downing the master releases all slaves. We can make bonds full of
3856 * bonding devices to test this, however.
3857 */
3858 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3859 {
3860 struct bonding *bond = netdev_priv(bond_dev);
3861 struct slave *slave, *rollback_slave;
3862 struct sockaddr_storage *ss = addr, tmp_ss;
3863 struct list_head *iter;
3864 int res = 0;
3865
3866 if (BOND_MODE(bond) == BOND_MODE_ALB)
3867 return bond_alb_set_mac_address(bond_dev, addr);
3868
3869
3870 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
3871
3872 /* If fail_over_mac is enabled, do nothing and return success.
3873 * Returning an error causes ifenslave to fail.
3874 */
3875 if (bond->params.fail_over_mac &&
3876 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3877 return 0;
3878
3879 if (!is_valid_ether_addr(ss->__data))
3880 return -EADDRNOTAVAIL;
3881
3882 bond_for_each_slave(bond, slave, iter) {
3883 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
3884 __func__, slave);
3885 res = dev_set_mac_address(slave->dev, addr, NULL);
3886 if (res) {
3887 /* TODO: consider downing the slave
3888 * and retry ?
3889 * User should expect communications
3890 * breakage anyway until ARP finish
3891 * updating, so...
3892 */
3893 slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
3894 __func__, res);
3895 goto unwind;
3896 }
3897 }
3898
3899 /* success */
3900 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
3901 return 0;
3902
3903 unwind:
3904 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
3905 tmp_ss.ss_family = bond_dev->type;
3906
3907 /* unwind from head to the slave that failed */
3908 bond_for_each_slave(bond, rollback_slave, iter) {
3909 int tmp_res;
3910
3911 if (rollback_slave == slave)
3912 break;
3913
3914 tmp_res = dev_set_mac_address(rollback_slave->dev,
3915 (struct sockaddr *)&tmp_ss, NULL);
3916 if (tmp_res) {
3917 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
3918 __func__, tmp_res);
3919 }
3920 }
3921
3922 return res;
3923 }
3924
3925 /**
3926 * bond_xmit_slave_id - transmit skb through slave with slave_id
3927 * @bond: bonding device that is transmitting
3928 * @skb: buffer to transmit
3929 * @slave_id: slave id up to slave_cnt-1 through which to transmit
3930 *
3931 * This function tries to transmit through slave with slave_id but in case
3932 * it fails, it tries to find the first available slave for transmission.
3933 * The skb is consumed in all cases, thus the function is void.
3934 */
3935 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3936 {
3937 struct list_head *iter;
3938 struct slave *slave;
3939 int i = slave_id;
3940
3941 /* Here we start from the slave with slave_id */
3942 bond_for_each_slave_rcu(bond, slave, iter) {
3943 if (--i < 0) {
3944 if (bond_slave_can_tx(slave)) {
3945 bond_dev_queue_xmit(bond, skb, slave->dev);
3946 return;
3947 }
3948 }
3949 }
3950
3951 /* Here we start from the first slave up to slave_id */
3952 i = slave_id;
3953 bond_for_each_slave_rcu(bond, slave, iter) {
3954 if (--i < 0)
3955 break;
3956 if (bond_slave_can_tx(slave)) {
3957 bond_dev_queue_xmit(bond, skb, slave->dev);
3958 return;
3959 }
3960 }
3961 /* no slave that can tx has been found */
3962 bond_tx_drop(bond->dev, skb);
3963 }
3964
3965 /**
3966 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3967 * @bond: bonding device to use
3968 *
3969 * Based on the value of the bonding device's packets_per_slave parameter
3970 * this function generates a slave id, which is usually used as the next
3971 * slave to transmit through.
3972 */
3973 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3974 {
3975 u32 slave_id;
3976 struct reciprocal_value reciprocal_packets_per_slave;
3977 int packets_per_slave = bond->params.packets_per_slave;
3978
3979 switch (packets_per_slave) {
3980 case 0:
3981 slave_id = prandom_u32();
3982 break;
3983 case 1:
3984 slave_id = bond->rr_tx_counter;
3985 break;
3986 default:
3987 reciprocal_packets_per_slave =
3988 bond->params.reciprocal_packets_per_slave;
3989 slave_id = reciprocal_divide(bond->rr_tx_counter,
3990 reciprocal_packets_per_slave);
3991 break;
3992 }
3993 bond->rr_tx_counter++;
3994
3995 return slave_id;
3996 }
3997
3998 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
3999 struct net_device *bond_dev)
4000 {
4001 struct bonding *bond = netdev_priv(bond_dev);
4002 struct slave *slave;
4003 int slave_cnt;
4004 u32 slave_id;
4005
4006 /* Start with the curr_active_slave that joined the bond as the
4007 * default for sending IGMP traffic. For failover purposes one
4008 * needs to maintain some consistency for the interface that will
4009 * send the join/membership reports. The curr_active_slave found
4010 * will send all of this type of traffic.
4011 */
4012 if (skb->protocol == htons(ETH_P_IP)) {
4013 int noff = skb_network_offset(skb);
4014 struct iphdr *iph;
4015
4016 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4017 goto non_igmp;
4018
4019 iph = ip_hdr(skb);
4020 if (iph->protocol == IPPROTO_IGMP) {
4021 slave = rcu_dereference(bond->curr_active_slave);
4022 if (slave)
4023 bond_dev_queue_xmit(bond, skb, slave->dev);
4024 else
4025 bond_xmit_slave_id(bond, skb, 0);
4026 return NETDEV_TX_OK;
4027 }
4028 }
4029
4030 non_igmp:
4031 slave_cnt = READ_ONCE(bond->slave_cnt);
4032 if (likely(slave_cnt)) {
4033 slave_id = bond_rr_gen_slave_id(bond);
4034 bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
4035 } else {
4036 bond_tx_drop(bond_dev, skb);
4037 }
4038 return NETDEV_TX_OK;
4039 }
4040
4041 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4042 * the bond has a usable interface.
4043 */
4044 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4045 struct net_device *bond_dev)
4046 {
4047 struct bonding *bond = netdev_priv(bond_dev);
4048 struct slave *slave;
4049
4050 slave = rcu_dereference(bond->curr_active_slave);
4051 if (slave)
4052 bond_dev_queue_xmit(bond, skb, slave->dev);
4053 else
4054 bond_tx_drop(bond_dev, skb);
4055
4056 return NETDEV_TX_OK;
4057 }
4058
4059 /* Use this to update slave_array when (a) it's not appropriate to update
4060 * slave_array right away (note that update_slave_array() may sleep)
4061 * and / or (b) RTNL is not held.
4062 */
4063 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4064 {
4065 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4066 }
4067
4068 /* Slave array work handler. Holds only RTNL */
4069 static void bond_slave_arr_handler(struct work_struct *work)
4070 {
4071 struct bonding *bond = container_of(work, struct bonding,
4072 slave_arr_work.work);
4073 int ret;
4074
4075 if (!rtnl_trylock())
4076 goto err;
4077
4078 ret = bond_update_slave_arr(bond, NULL);
4079 rtnl_unlock();
4080 if (ret) {
4081 pr_warn_ratelimited("Failed to update slave array from WT\n");
4082 goto err;
4083 }
4084 return;
4085
4086 err:
4087 bond_slave_arr_work_rearm(bond, 1);
4088 }
4089
4090 /* Build the usable slaves array in control path for modes that use xmit-hash
4091 * to determine the slave interface -
4092 * (a) BOND_MODE_8023AD
4093 * (b) BOND_MODE_XOR
4094 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4095 *
4096 * The caller is expected to hold RTNL only and NO other lock!
4097 */
4098 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4099 {
4100 struct slave *slave;
4101 struct list_head *iter;
4102 struct bond_up_slave *new_arr, *old_arr;
4103 int agg_id = 0;
4104 int ret = 0;
4105
4106 #ifdef CONFIG_LOCKDEP
4107 WARN_ON(lockdep_is_held(&bond->mode_lock));
4108 #endif
4109
4110 new_arr = kzalloc(offsetof(struct bond_up_slave, arr[bond->slave_cnt]),
4111 GFP_KERNEL);
4112 if (!new_arr) {
4113 ret = -ENOMEM;
4114 pr_err("Failed to build slave-array.\n");
4115 goto out;
4116 }
4117 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4118 struct ad_info ad_info;
4119
4120 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4121 pr_debug("bond_3ad_get_active_agg_info failed\n");
4122 kfree_rcu(new_arr, rcu);
4123 /* No active aggragator means it's not safe to use
4124 * the previous array.
4125 */
4126 old_arr = rtnl_dereference(bond->slave_arr);
4127 if (old_arr) {
4128 RCU_INIT_POINTER(bond->slave_arr, NULL);
4129 kfree_rcu(old_arr, rcu);
4130 }
4131 goto out;
4132 }
4133 agg_id = ad_info.aggregator_id;
4134 }
4135 bond_for_each_slave(bond, slave, iter) {
4136 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4137 struct aggregator *agg;
4138
4139 agg = SLAVE_AD_INFO(slave)->port.aggregator;
4140 if (!agg || agg->aggregator_identifier != agg_id)
4141 continue;
4142 }
4143 if (!bond_slave_can_tx(slave))
4144 continue;
4145 if (skipslave == slave)
4146 continue;
4147
4148 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4149 new_arr->count);
4150
4151 new_arr->arr[new_arr->count++] = slave;
4152 }
4153
4154 old_arr = rtnl_dereference(bond->slave_arr);
4155 rcu_assign_pointer(bond->slave_arr, new_arr);
4156 if (old_arr)
4157 kfree_rcu(old_arr, rcu);
4158 out:
4159 if (ret != 0 && skipslave) {
4160 int idx;
4161
4162 /* Rare situation where caller has asked to skip a specific
4163 * slave but allocation failed (most likely!). BTW this is
4164 * only possible when the call is initiated from
4165 * __bond_release_one(). In this situation; overwrite the
4166 * skipslave entry in the array with the last entry from the
4167 * array to avoid a situation where the xmit path may choose
4168 * this to-be-skipped slave to send a packet out.
4169 */
4170 old_arr = rtnl_dereference(bond->slave_arr);
4171 for (idx = 0; old_arr != NULL && idx < old_arr->count; idx++) {
4172 if (skipslave == old_arr->arr[idx]) {
4173 old_arr->arr[idx] =
4174 old_arr->arr[old_arr->count-1];
4175 old_arr->count--;
4176 break;
4177 }
4178 }
4179 }
4180 return ret;
4181 }
4182
4183 /* Use this Xmit function for 3AD as well as XOR modes. The current
4184 * usable slave array is formed in the control path. The xmit function
4185 * just calculates hash and sends the packet out.
4186 */
4187 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4188 struct net_device *dev)
4189 {
4190 struct bonding *bond = netdev_priv(dev);
4191 struct slave *slave;
4192 struct bond_up_slave *slaves;
4193 unsigned int count;
4194
4195 slaves = rcu_dereference(bond->slave_arr);
4196 count = slaves ? READ_ONCE(slaves->count) : 0;
4197 if (likely(count)) {
4198 slave = slaves->arr[bond_xmit_hash(bond, skb) % count];
4199 bond_dev_queue_xmit(bond, skb, slave->dev);
4200 } else {
4201 bond_tx_drop(dev, skb);
4202 }
4203
4204 return NETDEV_TX_OK;
4205 }
4206
4207 /* in broadcast mode, we send everything to all usable interfaces. */
4208 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4209 struct net_device *bond_dev)
4210 {
4211 struct bonding *bond = netdev_priv(bond_dev);
4212 struct slave *slave = NULL;
4213 struct list_head *iter;
4214
4215 bond_for_each_slave_rcu(bond, slave, iter) {
4216 if (bond_is_last_slave(bond, slave))
4217 break;
4218 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4219 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4220
4221 if (!skb2) {
4222 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4223 bond_dev->name, __func__);
4224 continue;
4225 }
4226 bond_dev_queue_xmit(bond, skb2, slave->dev);
4227 }
4228 }
4229 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4230 bond_dev_queue_xmit(bond, skb, slave->dev);
4231 else
4232 bond_tx_drop(bond_dev, skb);
4233
4234 return NETDEV_TX_OK;
4235 }
4236
4237 /*------------------------- Device initialization ---------------------------*/
4238
4239 /* Lookup the slave that corresponds to a qid */
4240 static inline int bond_slave_override(struct bonding *bond,
4241 struct sk_buff *skb)
4242 {
4243 struct slave *slave = NULL;
4244 struct list_head *iter;
4245
4246 if (!skb_rx_queue_recorded(skb))
4247 return 1;
4248
4249 /* Find out if any slaves have the same mapping as this skb. */
4250 bond_for_each_slave_rcu(bond, slave, iter) {
4251 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4252 if (bond_slave_is_up(slave) &&
4253 slave->link == BOND_LINK_UP) {
4254 bond_dev_queue_xmit(bond, skb, slave->dev);
4255 return 0;
4256 }
4257 /* If the slave isn't UP, use default transmit policy. */
4258 break;
4259 }
4260 }
4261
4262 return 1;
4263 }
4264
4265
4266 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4267 struct net_device *sb_dev)
4268 {
4269 /* This helper function exists to help dev_pick_tx get the correct
4270 * destination queue. Using a helper function skips a call to
4271 * skb_tx_hash and will put the skbs in the queue we expect on their
4272 * way down to the bonding driver.
4273 */
4274 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4275
4276 /* Save the original txq to restore before passing to the driver */
4277 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4278
4279 if (unlikely(txq >= dev->real_num_tx_queues)) {
4280 do {
4281 txq -= dev->real_num_tx_queues;
4282 } while (txq >= dev->real_num_tx_queues);
4283 }
4284 return txq;
4285 }
4286
4287 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4288 {
4289 struct bonding *bond = netdev_priv(dev);
4290
4291 if (bond_should_override_tx_queue(bond) &&
4292 !bond_slave_override(bond, skb))
4293 return NETDEV_TX_OK;
4294
4295 switch (BOND_MODE(bond)) {
4296 case BOND_MODE_ROUNDROBIN:
4297 return bond_xmit_roundrobin(skb, dev);
4298 case BOND_MODE_ACTIVEBACKUP:
4299 return bond_xmit_activebackup(skb, dev);
4300 case BOND_MODE_8023AD:
4301 case BOND_MODE_XOR:
4302 return bond_3ad_xor_xmit(skb, dev);
4303 case BOND_MODE_BROADCAST:
4304 return bond_xmit_broadcast(skb, dev);
4305 case BOND_MODE_ALB:
4306 return bond_alb_xmit(skb, dev);
4307 case BOND_MODE_TLB:
4308 return bond_tlb_xmit(skb, dev);
4309 default:
4310 /* Should never happen, mode already checked */
4311 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4312 WARN_ON_ONCE(1);
4313 bond_tx_drop(dev, skb);
4314 return NETDEV_TX_OK;
4315 }
4316 }
4317
4318 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4319 {
4320 struct bonding *bond = netdev_priv(dev);
4321 netdev_tx_t ret = NETDEV_TX_OK;
4322
4323 /* If we risk deadlock from transmitting this in the
4324 * netpoll path, tell netpoll to queue the frame for later tx
4325 */
4326 if (unlikely(is_netpoll_tx_blocked(dev)))
4327 return NETDEV_TX_BUSY;
4328
4329 rcu_read_lock();
4330 if (bond_has_slaves(bond))
4331 ret = __bond_start_xmit(skb, dev);
4332 else
4333 bond_tx_drop(dev, skb);
4334 rcu_read_unlock();
4335
4336 return ret;
4337 }
4338
4339 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4340 struct ethtool_link_ksettings *cmd)
4341 {
4342 struct bonding *bond = netdev_priv(bond_dev);
4343 unsigned long speed = 0;
4344 struct list_head *iter;
4345 struct slave *slave;
4346
4347 cmd->base.duplex = DUPLEX_UNKNOWN;
4348 cmd->base.port = PORT_OTHER;
4349
4350 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4351 * do not need to check mode. Though link speed might not represent
4352 * the true receive or transmit bandwidth (not all modes are symmetric)
4353 * this is an accurate maximum.
4354 */
4355 bond_for_each_slave(bond, slave, iter) {
4356 if (bond_slave_can_tx(slave)) {
4357 if (slave->speed != SPEED_UNKNOWN)
4358 speed += slave->speed;
4359 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4360 slave->duplex != DUPLEX_UNKNOWN)
4361 cmd->base.duplex = slave->duplex;
4362 }
4363 }
4364 cmd->base.speed = speed ? : SPEED_UNKNOWN;
4365
4366 return 0;
4367 }
4368
4369 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4370 struct ethtool_drvinfo *drvinfo)
4371 {
4372 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4373 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4374 BOND_ABI_VERSION);
4375 }
4376
4377 static const struct ethtool_ops bond_ethtool_ops = {
4378 .get_drvinfo = bond_ethtool_get_drvinfo,
4379 .get_link = ethtool_op_get_link,
4380 .get_link_ksettings = bond_ethtool_get_link_ksettings,
4381 };
4382
4383 static const struct net_device_ops bond_netdev_ops = {
4384 .ndo_init = bond_init,
4385 .ndo_uninit = bond_uninit,
4386 .ndo_open = bond_open,
4387 .ndo_stop = bond_close,
4388 .ndo_start_xmit = bond_start_xmit,
4389 .ndo_select_queue = bond_select_queue,
4390 .ndo_get_stats64 = bond_get_stats,
4391 .ndo_do_ioctl = bond_do_ioctl,
4392 .ndo_change_rx_flags = bond_change_rx_flags,
4393 .ndo_set_rx_mode = bond_set_rx_mode,
4394 .ndo_change_mtu = bond_change_mtu,
4395 .ndo_set_mac_address = bond_set_mac_address,
4396 .ndo_neigh_setup = bond_neigh_setup,
4397 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4398 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4399 #ifdef CONFIG_NET_POLL_CONTROLLER
4400 .ndo_netpoll_setup = bond_netpoll_setup,
4401 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4402 .ndo_poll_controller = bond_poll_controller,
4403 #endif
4404 .ndo_add_slave = bond_enslave,
4405 .ndo_del_slave = bond_release,
4406 .ndo_fix_features = bond_fix_features,
4407 .ndo_features_check = passthru_features_check,
4408 };
4409
4410 static const struct device_type bond_type = {
4411 .name = "bond",
4412 };
4413
4414 static void bond_destructor(struct net_device *bond_dev)
4415 {
4416 struct bonding *bond = netdev_priv(bond_dev);
4417 if (bond->wq)
4418 destroy_workqueue(bond->wq);
4419 }
4420
4421 void bond_setup(struct net_device *bond_dev)
4422 {
4423 struct bonding *bond = netdev_priv(bond_dev);
4424
4425 spin_lock_init(&bond->mode_lock);
4426 bond->params = bonding_defaults;
4427
4428 /* Initialize pointers */
4429 bond->dev = bond_dev;
4430
4431 /* Initialize the device entry points */
4432 ether_setup(bond_dev);
4433 bond_dev->max_mtu = ETH_MAX_MTU;
4434 bond_dev->netdev_ops = &bond_netdev_ops;
4435 bond_dev->ethtool_ops = &bond_ethtool_ops;
4436
4437 bond_dev->needs_free_netdev = true;
4438 bond_dev->priv_destructor = bond_destructor;
4439
4440 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4441
4442 /* Initialize the device options */
4443 bond_dev->flags |= IFF_MASTER;
4444 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4445 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4446
4447 /* don't acquire bond device's netif_tx_lock when transmitting */
4448 bond_dev->features |= NETIF_F_LLTX;
4449
4450 /* By default, we declare the bond to be fully
4451 * VLAN hardware accelerated capable. Special
4452 * care is taken in the various xmit functions
4453 * when there are slaves that are not hw accel
4454 * capable
4455 */
4456
4457 /* Don't allow bond devices to change network namespaces. */
4458 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4459
4460 bond_dev->hw_features = BOND_VLAN_FEATURES |
4461 NETIF_F_HW_VLAN_CTAG_RX |
4462 NETIF_F_HW_VLAN_CTAG_FILTER;
4463
4464 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL | NETIF_F_GSO_UDP_L4;
4465 bond_dev->features |= bond_dev->hw_features;
4466 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4467 }
4468
4469 /* Destroy a bonding device.
4470 * Must be under rtnl_lock when this function is called.
4471 */
4472 static void bond_uninit(struct net_device *bond_dev)
4473 {
4474 struct bonding *bond = netdev_priv(bond_dev);
4475 struct list_head *iter;
4476 struct slave *slave;
4477 struct bond_up_slave *arr;
4478
4479 bond_netpoll_cleanup(bond_dev);
4480
4481 /* Release the bonded slaves */
4482 bond_for_each_slave(bond, slave, iter)
4483 __bond_release_one(bond_dev, slave->dev, true, true);
4484 netdev_info(bond_dev, "Released all slaves\n");
4485
4486 arr = rtnl_dereference(bond->slave_arr);
4487 if (arr) {
4488 RCU_INIT_POINTER(bond->slave_arr, NULL);
4489 kfree_rcu(arr, rcu);
4490 }
4491
4492 list_del(&bond->bond_list);
4493
4494 lockdep_unregister_key(&bond->stats_lock_key);
4495 bond_debug_unregister(bond);
4496 }
4497
4498 /*------------------------- Module initialization ---------------------------*/
4499
4500 static int bond_check_params(struct bond_params *params)
4501 {
4502 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4503 struct bond_opt_value newval;
4504 const struct bond_opt_value *valptr;
4505 int arp_all_targets_value = 0;
4506 u16 ad_actor_sys_prio = 0;
4507 u16 ad_user_port_key = 0;
4508 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4509 int arp_ip_count;
4510 int bond_mode = BOND_MODE_ROUNDROBIN;
4511 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4512 int lacp_fast = 0;
4513 int tlb_dynamic_lb;
4514
4515 /* Convert string parameters. */
4516 if (mode) {
4517 bond_opt_initstr(&newval, mode);
4518 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4519 if (!valptr) {
4520 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4521 return -EINVAL;
4522 }
4523 bond_mode = valptr->value;
4524 }
4525
4526 if (xmit_hash_policy) {
4527 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4528 bond_mode == BOND_MODE_ACTIVEBACKUP ||
4529 bond_mode == BOND_MODE_BROADCAST) {
4530 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4531 bond_mode_name(bond_mode));
4532 } else {
4533 bond_opt_initstr(&newval, xmit_hash_policy);
4534 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4535 &newval);
4536 if (!valptr) {
4537 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4538 xmit_hash_policy);
4539 return -EINVAL;
4540 }
4541 xmit_hashtype = valptr->value;
4542 }
4543 }
4544
4545 if (lacp_rate) {
4546 if (bond_mode != BOND_MODE_8023AD) {
4547 pr_info("lacp_rate param is irrelevant in mode %s\n",
4548 bond_mode_name(bond_mode));
4549 } else {
4550 bond_opt_initstr(&newval, lacp_rate);
4551 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4552 &newval);
4553 if (!valptr) {
4554 pr_err("Error: Invalid lacp rate \"%s\"\n",
4555 lacp_rate);
4556 return -EINVAL;
4557 }
4558 lacp_fast = valptr->value;
4559 }
4560 }
4561
4562 if (ad_select) {
4563 bond_opt_initstr(&newval, ad_select);
4564 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4565 &newval);
4566 if (!valptr) {
4567 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4568 return -EINVAL;
4569 }
4570 params->ad_select = valptr->value;
4571 if (bond_mode != BOND_MODE_8023AD)
4572 pr_warn("ad_select param only affects 802.3ad mode\n");
4573 } else {
4574 params->ad_select = BOND_AD_STABLE;
4575 }
4576
4577 if (max_bonds < 0) {
4578 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4579 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4580 max_bonds = BOND_DEFAULT_MAX_BONDS;
4581 }
4582
4583 if (miimon < 0) {
4584 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4585 miimon, INT_MAX);
4586 miimon = 0;
4587 }
4588
4589 if (updelay < 0) {
4590 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4591 updelay, INT_MAX);
4592 updelay = 0;
4593 }
4594
4595 if (downdelay < 0) {
4596 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4597 downdelay, INT_MAX);
4598 downdelay = 0;
4599 }
4600
4601 if ((use_carrier != 0) && (use_carrier != 1)) {
4602 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4603 use_carrier);
4604 use_carrier = 1;
4605 }
4606
4607 if (num_peer_notif < 0 || num_peer_notif > 255) {
4608 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4609 num_peer_notif);
4610 num_peer_notif = 1;
4611 }
4612
4613 /* reset values for 802.3ad/TLB/ALB */
4614 if (!bond_mode_uses_arp(bond_mode)) {
4615 if (!miimon) {
4616 pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4617 pr_warn("Forcing miimon to 100msec\n");
4618 miimon = BOND_DEFAULT_MIIMON;
4619 }
4620 }
4621
4622 if (tx_queues < 1 || tx_queues > 255) {
4623 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4624 tx_queues, BOND_DEFAULT_TX_QUEUES);
4625 tx_queues = BOND_DEFAULT_TX_QUEUES;
4626 }
4627
4628 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4629 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4630 all_slaves_active);
4631 all_slaves_active = 0;
4632 }
4633
4634 if (resend_igmp < 0 || resend_igmp > 255) {
4635 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4636 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4637 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4638 }
4639
4640 bond_opt_initval(&newval, packets_per_slave);
4641 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4642 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4643 packets_per_slave, USHRT_MAX);
4644 packets_per_slave = 1;
4645 }
4646
4647 if (bond_mode == BOND_MODE_ALB) {
4648 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",
4649 updelay);
4650 }
4651
4652 if (!miimon) {
4653 if (updelay || downdelay) {
4654 /* just warn the user the up/down delay will have
4655 * no effect since miimon is zero...
4656 */
4657 pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4658 updelay, downdelay);
4659 }
4660 } else {
4661 /* don't allow arp monitoring */
4662 if (arp_interval) {
4663 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4664 miimon, arp_interval);
4665 arp_interval = 0;
4666 }
4667
4668 if ((updelay % miimon) != 0) {
4669 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4670 updelay, miimon, (updelay / miimon) * miimon);
4671 }
4672
4673 updelay /= miimon;
4674
4675 if ((downdelay % miimon) != 0) {
4676 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4677 downdelay, miimon,
4678 (downdelay / miimon) * miimon);
4679 }
4680
4681 downdelay /= miimon;
4682 }
4683
4684 if (arp_interval < 0) {
4685 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4686 arp_interval, INT_MAX);
4687 arp_interval = 0;
4688 }
4689
4690 for (arp_ip_count = 0, i = 0;
4691 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4692 __be32 ip;
4693
4694 /* not a complete check, but good enough to catch mistakes */
4695 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4696 !bond_is_ip_target_ok(ip)) {
4697 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4698 arp_ip_target[i]);
4699 arp_interval = 0;
4700 } else {
4701 if (bond_get_targets_ip(arp_target, ip) == -1)
4702 arp_target[arp_ip_count++] = ip;
4703 else
4704 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4705 &ip);
4706 }
4707 }
4708
4709 if (arp_interval && !arp_ip_count) {
4710 /* don't allow arping if no arp_ip_target given... */
4711 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4712 arp_interval);
4713 arp_interval = 0;
4714 }
4715
4716 if (arp_validate) {
4717 if (!arp_interval) {
4718 pr_err("arp_validate requires arp_interval\n");
4719 return -EINVAL;
4720 }
4721
4722 bond_opt_initstr(&newval, arp_validate);
4723 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4724 &newval);
4725 if (!valptr) {
4726 pr_err("Error: invalid arp_validate \"%s\"\n",
4727 arp_validate);
4728 return -EINVAL;
4729 }
4730 arp_validate_value = valptr->value;
4731 } else {
4732 arp_validate_value = 0;
4733 }
4734
4735 if (arp_all_targets) {
4736 bond_opt_initstr(&newval, arp_all_targets);
4737 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4738 &newval);
4739 if (!valptr) {
4740 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4741 arp_all_targets);
4742 arp_all_targets_value = 0;
4743 } else {
4744 arp_all_targets_value = valptr->value;
4745 }
4746 }
4747
4748 if (miimon) {
4749 pr_info("MII link monitoring set to %d ms\n", miimon);
4750 } else if (arp_interval) {
4751 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4752 arp_validate_value);
4753 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4754 arp_interval, valptr->string, arp_ip_count);
4755
4756 for (i = 0; i < arp_ip_count; i++)
4757 pr_cont(" %s", arp_ip_target[i]);
4758
4759 pr_cont("\n");
4760
4761 } else if (max_bonds) {
4762 /* miimon and arp_interval not set, we need one so things
4763 * work as expected, see bonding.txt for details
4764 */
4765 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");
4766 }
4767
4768 if (primary && !bond_mode_uses_primary(bond_mode)) {
4769 /* currently, using a primary only makes sense
4770 * in active backup, TLB or ALB modes
4771 */
4772 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4773 primary, bond_mode_name(bond_mode));
4774 primary = NULL;
4775 }
4776
4777 if (primary && primary_reselect) {
4778 bond_opt_initstr(&newval, primary_reselect);
4779 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4780 &newval);
4781 if (!valptr) {
4782 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4783 primary_reselect);
4784 return -EINVAL;
4785 }
4786 primary_reselect_value = valptr->value;
4787 } else {
4788 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4789 }
4790
4791 if (fail_over_mac) {
4792 bond_opt_initstr(&newval, fail_over_mac);
4793 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4794 &newval);
4795 if (!valptr) {
4796 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4797 fail_over_mac);
4798 return -EINVAL;
4799 }
4800 fail_over_mac_value = valptr->value;
4801 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4802 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4803 } else {
4804 fail_over_mac_value = BOND_FOM_NONE;
4805 }
4806
4807 bond_opt_initstr(&newval, "default");
4808 valptr = bond_opt_parse(
4809 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
4810 &newval);
4811 if (!valptr) {
4812 pr_err("Error: No ad_actor_sys_prio default value");
4813 return -EINVAL;
4814 }
4815 ad_actor_sys_prio = valptr->value;
4816
4817 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
4818 &newval);
4819 if (!valptr) {
4820 pr_err("Error: No ad_user_port_key default value");
4821 return -EINVAL;
4822 }
4823 ad_user_port_key = valptr->value;
4824
4825 bond_opt_initstr(&newval, "default");
4826 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
4827 if (!valptr) {
4828 pr_err("Error: No tlb_dynamic_lb default value");
4829 return -EINVAL;
4830 }
4831 tlb_dynamic_lb = valptr->value;
4832
4833 if (lp_interval == 0) {
4834 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4835 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4836 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4837 }
4838
4839 /* fill params struct with the proper values */
4840 params->mode = bond_mode;
4841 params->xmit_policy = xmit_hashtype;
4842 params->miimon = miimon;
4843 params->num_peer_notif = num_peer_notif;
4844 params->arp_interval = arp_interval;
4845 params->arp_validate = arp_validate_value;
4846 params->arp_all_targets = arp_all_targets_value;
4847 params->updelay = updelay;
4848 params->downdelay = downdelay;
4849 params->peer_notif_delay = 0;
4850 params->use_carrier = use_carrier;
4851 params->lacp_fast = lacp_fast;
4852 params->primary[0] = 0;
4853 params->primary_reselect = primary_reselect_value;
4854 params->fail_over_mac = fail_over_mac_value;
4855 params->tx_queues = tx_queues;
4856 params->all_slaves_active = all_slaves_active;
4857 params->resend_igmp = resend_igmp;
4858 params->min_links = min_links;
4859 params->lp_interval = lp_interval;
4860 params->packets_per_slave = packets_per_slave;
4861 params->tlb_dynamic_lb = tlb_dynamic_lb;
4862 params->ad_actor_sys_prio = ad_actor_sys_prio;
4863 eth_zero_addr(params->ad_actor_system);
4864 params->ad_user_port_key = ad_user_port_key;
4865 if (packets_per_slave > 0) {
4866 params->reciprocal_packets_per_slave =
4867 reciprocal_value(packets_per_slave);
4868 } else {
4869 /* reciprocal_packets_per_slave is unused if
4870 * packets_per_slave is 0 or 1, just initialize it
4871 */
4872 params->reciprocal_packets_per_slave =
4873 (struct reciprocal_value) { 0 };
4874 }
4875
4876 if (primary) {
4877 strncpy(params->primary, primary, IFNAMSIZ);
4878 params->primary[IFNAMSIZ - 1] = 0;
4879 }
4880
4881 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4882
4883 return 0;
4884 }
4885
4886 /* Called from registration process */
4887 static int bond_init(struct net_device *bond_dev)
4888 {
4889 struct bonding *bond = netdev_priv(bond_dev);
4890 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4891
4892 netdev_dbg(bond_dev, "Begin bond_init\n");
4893
4894 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
4895 if (!bond->wq)
4896 return -ENOMEM;
4897
4898 spin_lock_init(&bond->stats_lock);
4899 lockdep_register_key(&bond->stats_lock_key);
4900 lockdep_set_class(&bond->stats_lock, &bond->stats_lock_key);
4901
4902 list_add_tail(&bond->bond_list, &bn->dev_list);
4903
4904 bond_prepare_sysfs_group(bond);
4905
4906 bond_debug_register(bond);
4907
4908 /* Ensure valid dev_addr */
4909 if (is_zero_ether_addr(bond_dev->dev_addr) &&
4910 bond_dev->addr_assign_type == NET_ADDR_PERM)
4911 eth_hw_addr_random(bond_dev);
4912
4913 return 0;
4914 }
4915
4916 unsigned int bond_get_num_tx_queues(void)
4917 {
4918 return tx_queues;
4919 }
4920
4921 /* Create a new bond based on the specified name and bonding parameters.
4922 * If name is NULL, obtain a suitable "bond%d" name for us.
4923 * Caller must NOT hold rtnl_lock; we need to release it here before we
4924 * set up our sysfs entries.
4925 */
4926 int bond_create(struct net *net, const char *name)
4927 {
4928 struct net_device *bond_dev;
4929 struct bonding *bond;
4930 struct alb_bond_info *bond_info;
4931 int res;
4932
4933 rtnl_lock();
4934
4935 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4936 name ? name : "bond%d", NET_NAME_UNKNOWN,
4937 bond_setup, tx_queues);
4938 if (!bond_dev) {
4939 pr_err("%s: eek! can't alloc netdev!\n", name);
4940 rtnl_unlock();
4941 return -ENOMEM;
4942 }
4943
4944 /*
4945 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
4946 * It is set to 0 by default which is wrong.
4947 */
4948 bond = netdev_priv(bond_dev);
4949 bond_info = &(BOND_ALB_INFO(bond));
4950 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
4951
4952 dev_net_set(bond_dev, net);
4953 bond_dev->rtnl_link_ops = &bond_link_ops;
4954
4955 res = register_netdevice(bond_dev);
4956
4957 netif_carrier_off(bond_dev);
4958
4959 bond_work_init_all(bond);
4960
4961 rtnl_unlock();
4962 if (res < 0)
4963 free_netdev(bond_dev);
4964 return res;
4965 }
4966
4967 static int __net_init bond_net_init(struct net *net)
4968 {
4969 struct bond_net *bn = net_generic(net, bond_net_id);
4970
4971 bn->net = net;
4972 INIT_LIST_HEAD(&bn->dev_list);
4973
4974 bond_create_proc_dir(bn);
4975 bond_create_sysfs(bn);
4976
4977 return 0;
4978 }
4979
4980 static void __net_exit bond_net_exit(struct net *net)
4981 {
4982 struct bond_net *bn = net_generic(net, bond_net_id);
4983 struct bonding *bond, *tmp_bond;
4984 LIST_HEAD(list);
4985
4986 bond_destroy_sysfs(bn);
4987
4988 /* Kill off any bonds created after unregistering bond rtnl ops */
4989 rtnl_lock();
4990 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4991 unregister_netdevice_queue(bond->dev, &list);
4992 unregister_netdevice_many(&list);
4993 rtnl_unlock();
4994
4995 bond_destroy_proc_dir(bn);
4996 }
4997
4998 static struct pernet_operations bond_net_ops = {
4999 .init = bond_net_init,
5000 .exit = bond_net_exit,
5001 .id = &bond_net_id,
5002 .size = sizeof(struct bond_net),
5003 };
5004
5005 static int __init bonding_init(void)
5006 {
5007 int i;
5008 int res;
5009
5010 res = bond_check_params(&bonding_defaults);
5011 if (res)
5012 goto out;
5013
5014 res = register_pernet_subsys(&bond_net_ops);
5015 if (res)
5016 goto out;
5017
5018 res = bond_netlink_init();
5019 if (res)
5020 goto err_link;
5021
5022 bond_create_debugfs();
5023
5024 for (i = 0; i < max_bonds; i++) {
5025 res = bond_create(&init_net, NULL);
5026 if (res)
5027 goto err;
5028 }
5029
5030 skb_flow_dissector_init(&flow_keys_bonding,
5031 flow_keys_bonding_keys,
5032 ARRAY_SIZE(flow_keys_bonding_keys));
5033
5034 register_netdevice_notifier(&bond_netdev_notifier);
5035 out:
5036 return res;
5037 err:
5038 bond_destroy_debugfs();
5039 bond_netlink_fini();
5040 err_link:
5041 unregister_pernet_subsys(&bond_net_ops);
5042 goto out;
5043
5044 }
5045
5046 static void __exit bonding_exit(void)
5047 {
5048 unregister_netdevice_notifier(&bond_netdev_notifier);
5049
5050 bond_destroy_debugfs();
5051
5052 bond_netlink_fini();
5053 unregister_pernet_subsys(&bond_net_ops);
5054
5055 #ifdef CONFIG_NET_POLL_CONTROLLER
5056 /* Make sure we don't have an imbalance on our netpoll blocking */
5057 WARN_ON(atomic_read(&netpoll_block_tx));
5058 #endif
5059 }
5060
5061 module_init(bonding_init);
5062 module_exit(bonding_exit);
5063 MODULE_LICENSE("GPL");
5064 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5065 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux with added FPC-III support