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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / net / bonding / bond_main.c
blob5fe5232cc3f386025a39aaa8b024ea943316c106
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/xfrm.h>
83 #include <net/bonding.h>
84 #include <net/bond_3ad.h>
85 #include <net/bond_alb.h>
86
87 #include "bonding_priv.h"
88
89 /*---------------------------- Module parameters ----------------------------*/
90
91 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
92
93 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
94 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
95 static int num_peer_notif = 1;
96 static int miimon;
97 static int updelay;
98 static int downdelay;
99 static int use_carrier = 1;
100 static char *mode;
101 static char *primary;
102 static char *primary_reselect;
103 static char *lacp_rate;
104 static int min_links;
105 static char *ad_select;
106 static char *xmit_hash_policy;
107 static int arp_interval;
108 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
109 static char *arp_validate;
110 static char *arp_all_targets;
111 static char *fail_over_mac;
112 static int all_slaves_active;
113 static struct bond_params bonding_defaults;
114 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
115 static int packets_per_slave = 1;
116 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
117
118 module_param(max_bonds, int, 0);
119 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
120 module_param(tx_queues, int, 0);
121 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
122 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
123 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
124 "failover event (alias of num_unsol_na)");
125 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
126 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
127 "failover event (alias of num_grat_arp)");
128 module_param(miimon, int, 0);
129 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
130 module_param(updelay, int, 0);
131 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
132 module_param(downdelay, int, 0);
133 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
134 "in milliseconds");
135 module_param(use_carrier, int, 0);
136 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
137 "0 for off, 1 for on (default)");
138 module_param(mode, charp, 0);
139 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
140 "1 for active-backup, 2 for balance-xor, "
141 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
142 "6 for balance-alb");
143 module_param(primary, charp, 0);
144 MODULE_PARM_DESC(primary, "Primary network device to use");
145 module_param(primary_reselect, charp, 0);
146 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
147 "once it comes up; "
148 "0 for always (default), "
149 "1 for only if speed of primary is "
150 "better, "
151 "2 for only on active slave "
152 "failure");
153 module_param(lacp_rate, charp, 0);
154 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
155 "0 for slow, 1 for fast");
156 module_param(ad_select, charp, 0);
157 MODULE_PARM_DESC(ad_select, "802.3ad aggregation selection logic; "
158 "0 for stable (default), 1 for bandwidth, "
159 "2 for count");
160 module_param(min_links, int, 0);
161 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
162
163 module_param(xmit_hash_policy, charp, 0);
164 MODULE_PARM_DESC(xmit_hash_policy, "balance-alb, balance-tlb, balance-xor, 802.3ad hashing method; "
165 "0 for layer 2 (default), 1 for layer 3+4, "
166 "2 for layer 2+3, 3 for encap layer 2+3, "
167 "4 for encap layer 3+4");
168 module_param(arp_interval, int, 0);
169 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
170 module_param_array(arp_ip_target, charp, NULL, 0);
171 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
172 module_param(arp_validate, charp, 0);
173 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
174 "0 for none (default), 1 for active, "
175 "2 for backup, 3 for all");
176 module_param(arp_all_targets, charp, 0);
177 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
178 module_param(fail_over_mac, charp, 0);
179 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
180 "the same MAC; 0 for none (default), "
181 "1 for active, 2 for follow");
182 module_param(all_slaves_active, int, 0);
183 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface "
184 "by setting active flag for all slaves; "
185 "0 for never (default), 1 for always.");
186 module_param(resend_igmp, int, 0);
187 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
188 "link failure");
189 module_param(packets_per_slave, int, 0);
190 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
191 "mode; 0 for a random slave, 1 packet per "
192 "slave (default), >1 packets per slave.");
193 module_param(lp_interval, uint, 0);
194 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
195 "the bonding driver sends learning packets to "
196 "each slaves peer switch. The default is 1.");
197
198 /*----------------------------- Global variables ----------------------------*/
199
200 #ifdef CONFIG_NET_POLL_CONTROLLER
201 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
202 #endif
203
204 unsigned int bond_net_id __read_mostly;
205
206 static const struct flow_dissector_key flow_keys_bonding_keys[] = {
207 {
208 .key_id = FLOW_DISSECTOR_KEY_CONTROL,
209 .offset = offsetof(struct flow_keys, control),
210 },
211 {
212 .key_id = FLOW_DISSECTOR_KEY_BASIC,
213 .offset = offsetof(struct flow_keys, basic),
214 },
215 {
216 .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS,
217 .offset = offsetof(struct flow_keys, addrs.v4addrs),
218 },
219 {
220 .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS,
221 .offset = offsetof(struct flow_keys, addrs.v6addrs),
222 },
223 {
224 .key_id = FLOW_DISSECTOR_KEY_TIPC,
225 .offset = offsetof(struct flow_keys, addrs.tipckey),
226 },
227 {
228 .key_id = FLOW_DISSECTOR_KEY_PORTS,
229 .offset = offsetof(struct flow_keys, ports),
230 },
231 {
232 .key_id = FLOW_DISSECTOR_KEY_ICMP,
233 .offset = offsetof(struct flow_keys, icmp),
234 },
235 {
236 .key_id = FLOW_DISSECTOR_KEY_VLAN,
237 .offset = offsetof(struct flow_keys, vlan),
238 },
239 {
240 .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
241 .offset = offsetof(struct flow_keys, tags),
242 },
243 {
244 .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID,
245 .offset = offsetof(struct flow_keys, keyid),
246 },
247 };
248
249 static struct flow_dissector flow_keys_bonding __read_mostly;
250
251 /*-------------------------- Forward declarations ---------------------------*/
252
253 static int bond_init(struct net_device *bond_dev);
254 static void bond_uninit(struct net_device *bond_dev);
255 static void bond_get_stats(struct net_device *bond_dev,
256 struct rtnl_link_stats64 *stats);
257 static void bond_slave_arr_handler(struct work_struct *work);
258 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
259 int mod);
260 static void bond_netdev_notify_work(struct work_struct *work);
261
262 /*---------------------------- General routines -----------------------------*/
263
264 const char *bond_mode_name(int mode)
265 {
266 static const char *names[] = {
267 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
268 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
269 [BOND_MODE_XOR] = "load balancing (xor)",
270 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
271 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
272 [BOND_MODE_TLB] = "transmit load balancing",
273 [BOND_MODE_ALB] = "adaptive load balancing",
274 };
275
276 if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
277 return "unknown";
278
279 return names[mode];
280 }
281
282 /**
283 * bond_dev_queue_xmit - Prepare skb for xmit.
284 *
285 * @bond: bond device that got this skb for tx.
286 * @skb: hw accel VLAN tagged skb to transmit
287 * @slave_dev: slave that is supposed to xmit this skbuff
288 */
289 netdev_tx_t bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
290 struct net_device *slave_dev)
291 {
292 skb->dev = slave_dev;
293
294 BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
295 sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
296 skb_set_queue_mapping(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
297
298 if (unlikely(netpoll_tx_running(bond->dev)))
299 return bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
300
301 return dev_queue_xmit(skb);
302 }
303
304 /*---------------------------------- VLAN -----------------------------------*/
305
306 /* In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
307 * We don't protect the slave list iteration with a lock because:
308 * a. This operation is performed in IOCTL context,
309 * b. The operation is protected by the RTNL semaphore in the 8021q code,
310 * c. Holding a lock with BH disabled while directly calling a base driver
311 * entry point is generally a BAD idea.
312 *
313 * The design of synchronization/protection for this operation in the 8021q
314 * module is good for one or more VLAN devices over a single physical device
315 * and cannot be extended for a teaming solution like bonding, so there is a
316 * potential race condition here where a net device from the vlan group might
317 * be referenced (either by a base driver or the 8021q code) while it is being
318 * removed from the system. However, it turns out we're not making matters
319 * worse, and if it works for regular VLAN usage it will work here too.
320 */
321
322 /**
323 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
324 * @bond_dev: bonding net device that got called
325 * @proto: network protocol ID
326 * @vid: vlan id being added
327 */
328 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
329 __be16 proto, u16 vid)
330 {
331 struct bonding *bond = netdev_priv(bond_dev);
332 struct slave *slave, *rollback_slave;
333 struct list_head *iter;
334 int res;
335
336 bond_for_each_slave(bond, slave, iter) {
337 res = vlan_vid_add(slave->dev, proto, vid);
338 if (res)
339 goto unwind;
340 }
341
342 return 0;
343
344 unwind:
345 /* unwind to the slave that failed */
346 bond_for_each_slave(bond, rollback_slave, iter) {
347 if (rollback_slave == slave)
348 break;
349
350 vlan_vid_del(rollback_slave->dev, proto, vid);
351 }
352
353 return res;
354 }
355
356 /**
357 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
358 * @bond_dev: bonding net device that got called
359 * @proto: network protocol ID
360 * @vid: vlan id being removed
361 */
362 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
363 __be16 proto, u16 vid)
364 {
365 struct bonding *bond = netdev_priv(bond_dev);
366 struct list_head *iter;
367 struct slave *slave;
368
369 bond_for_each_slave(bond, slave, iter)
370 vlan_vid_del(slave->dev, proto, vid);
371
372 if (bond_is_lb(bond))
373 bond_alb_clear_vlan(bond, vid);
374
375 return 0;
376 }
377
378 /*---------------------------------- XFRM -----------------------------------*/
379
380 #ifdef CONFIG_XFRM_OFFLOAD
381 /**
382 * bond_ipsec_add_sa - program device with a security association
383 * @xs: pointer to transformer state struct
384 **/
385 static int bond_ipsec_add_sa(struct xfrm_state *xs)
386 {
387 struct net_device *bond_dev = xs->xso.dev;
388 struct bonding *bond;
389 struct slave *slave;
390
391 if (!bond_dev)
392 return -EINVAL;
393
394 bond = netdev_priv(bond_dev);
395 slave = rcu_dereference(bond->curr_active_slave);
396 xs->xso.real_dev = slave->dev;
397 bond->xs = xs;
398
399 if (!(slave->dev->xfrmdev_ops
400 && slave->dev->xfrmdev_ops->xdo_dev_state_add)) {
401 slave_warn(bond_dev, slave->dev, "Slave does not support ipsec offload\n");
402 return -EINVAL;
403 }
404
405 return slave->dev->xfrmdev_ops->xdo_dev_state_add(xs);
406 }
407
408 /**
409 * bond_ipsec_del_sa - clear out this specific SA
410 * @xs: pointer to transformer state struct
411 **/
412 static void bond_ipsec_del_sa(struct xfrm_state *xs)
413 {
414 struct net_device *bond_dev = xs->xso.dev;
415 struct bonding *bond;
416 struct slave *slave;
417
418 if (!bond_dev)
419 return;
420
421 bond = netdev_priv(bond_dev);
422 slave = rcu_dereference(bond->curr_active_slave);
423
424 if (!slave)
425 return;
426
427 xs->xso.real_dev = slave->dev;
428
429 if (!(slave->dev->xfrmdev_ops
430 && slave->dev->xfrmdev_ops->xdo_dev_state_delete)) {
431 slave_warn(bond_dev, slave->dev, "%s: no slave xdo_dev_state_delete\n", __func__);
432 return;
433 }
434
435 slave->dev->xfrmdev_ops->xdo_dev_state_delete(xs);
436 }
437
438 /**
439 * bond_ipsec_offload_ok - can this packet use the xfrm hw offload
440 * @skb: current data packet
441 * @xs: pointer to transformer state struct
442 **/
443 static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
444 {
445 struct net_device *bond_dev = xs->xso.dev;
446 struct bonding *bond = netdev_priv(bond_dev);
447 struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
448 struct net_device *slave_dev = curr_active->dev;
449
450 if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
451 return true;
452
453 if (!(slave_dev->xfrmdev_ops
454 && slave_dev->xfrmdev_ops->xdo_dev_offload_ok)) {
455 slave_warn(bond_dev, slave_dev, "%s: no slave xdo_dev_offload_ok\n", __func__);
456 return false;
457 }
458
459 xs->xso.real_dev = slave_dev;
460 return slave_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
461 }
462
463 static const struct xfrmdev_ops bond_xfrmdev_ops = {
464 .xdo_dev_state_add = bond_ipsec_add_sa,
465 .xdo_dev_state_delete = bond_ipsec_del_sa,
466 .xdo_dev_offload_ok = bond_ipsec_offload_ok,
467 };
468 #endif /* CONFIG_XFRM_OFFLOAD */
469
470 /*------------------------------- Link status -------------------------------*/
471
472 /* Set the carrier state for the master according to the state of its
473 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
474 * do special 802.3ad magic.
475 *
476 * Returns zero if carrier state does not change, nonzero if it does.
477 */
478 int bond_set_carrier(struct bonding *bond)
479 {
480 struct list_head *iter;
481 struct slave *slave;
482
483 if (!bond_has_slaves(bond))
484 goto down;
485
486 if (BOND_MODE(bond) == BOND_MODE_8023AD)
487 return bond_3ad_set_carrier(bond);
488
489 bond_for_each_slave(bond, slave, iter) {
490 if (slave->link == BOND_LINK_UP) {
491 if (!netif_carrier_ok(bond->dev)) {
492 netif_carrier_on(bond->dev);
493 return 1;
494 }
495 return 0;
496 }
497 }
498
499 down:
500 if (netif_carrier_ok(bond->dev)) {
501 netif_carrier_off(bond->dev);
502 return 1;
503 }
504 return 0;
505 }
506
507 /* Get link speed and duplex from the slave's base driver
508 * using ethtool. If for some reason the call fails or the
509 * values are invalid, set speed and duplex to -1,
510 * and return. Return 1 if speed or duplex settings are
511 * UNKNOWN; 0 otherwise.
512 */
513 static int bond_update_speed_duplex(struct slave *slave)
514 {
515 struct net_device *slave_dev = slave->dev;
516 struct ethtool_link_ksettings ecmd;
517 int res;
518
519 slave->speed = SPEED_UNKNOWN;
520 slave->duplex = DUPLEX_UNKNOWN;
521
522 res = __ethtool_get_link_ksettings(slave_dev, &ecmd);
523 if (res < 0)
524 return 1;
525 if (ecmd.base.speed == 0 || ecmd.base.speed == ((__u32)-1))
526 return 1;
527 switch (ecmd.base.duplex) {
528 case DUPLEX_FULL:
529 case DUPLEX_HALF:
530 break;
531 default:
532 return 1;
533 }
534
535 slave->speed = ecmd.base.speed;
536 slave->duplex = ecmd.base.duplex;
537
538 return 0;
539 }
540
541 const char *bond_slave_link_status(s8 link)
542 {
543 switch (link) {
544 case BOND_LINK_UP:
545 return "up";
546 case BOND_LINK_FAIL:
547 return "going down";
548 case BOND_LINK_DOWN:
549 return "down";
550 case BOND_LINK_BACK:
551 return "going back";
552 default:
553 return "unknown";
554 }
555 }
556
557 /* if <dev> supports MII link status reporting, check its link status.
558 *
559 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
560 * depending upon the setting of the use_carrier parameter.
561 *
562 * Return either BMSR_LSTATUS, meaning that the link is up (or we
563 * can't tell and just pretend it is), or 0, meaning that the link is
564 * down.
565 *
566 * If reporting is non-zero, instead of faking link up, return -1 if
567 * both ETHTOOL and MII ioctls fail (meaning the device does not
568 * support them). If use_carrier is set, return whatever it says.
569 * It'd be nice if there was a good way to tell if a driver supports
570 * netif_carrier, but there really isn't.
571 */
572 static int bond_check_dev_link(struct bonding *bond,
573 struct net_device *slave_dev, int reporting)
574 {
575 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
576 int (*ioctl)(struct net_device *, struct ifreq *, int);
577 struct ifreq ifr;
578 struct mii_ioctl_data *mii;
579
580 if (!reporting && !netif_running(slave_dev))
581 return 0;
582
583 if (bond->params.use_carrier)
584 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
585
586 /* Try to get link status using Ethtool first. */
587 if (slave_dev->ethtool_ops->get_link)
588 return slave_dev->ethtool_ops->get_link(slave_dev) ?
589 BMSR_LSTATUS : 0;
590
591 /* Ethtool can't be used, fallback to MII ioctls. */
592 ioctl = slave_ops->ndo_do_ioctl;
593 if (ioctl) {
594 /* TODO: set pointer to correct ioctl on a per team member
595 * bases to make this more efficient. that is, once
596 * we determine the correct ioctl, we will always
597 * call it and not the others for that team
598 * member.
599 */
600
601 /* We cannot assume that SIOCGMIIPHY will also read a
602 * register; not all network drivers (e.g., e100)
603 * support that.
604 */
605
606 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
607 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
608 mii = if_mii(&ifr);
609 if (ioctl(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
610 mii->reg_num = MII_BMSR;
611 if (ioctl(slave_dev, &ifr, SIOCGMIIREG) == 0)
612 return mii->val_out & BMSR_LSTATUS;
613 }
614 }
615
616 /* If reporting, report that either there's no dev->do_ioctl,
617 * or both SIOCGMIIREG and get_link failed (meaning that we
618 * cannot report link status). If not reporting, pretend
619 * we're ok.
620 */
621 return reporting ? -1 : BMSR_LSTATUS;
622 }
623
624 /*----------------------------- Multicast list ------------------------------*/
625
626 /* Push the promiscuity flag down to appropriate slaves */
627 static int bond_set_promiscuity(struct bonding *bond, int inc)
628 {
629 struct list_head *iter;
630 int err = 0;
631
632 if (bond_uses_primary(bond)) {
633 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
634
635 if (curr_active)
636 err = dev_set_promiscuity(curr_active->dev, inc);
637 } else {
638 struct slave *slave;
639
640 bond_for_each_slave(bond, slave, iter) {
641 err = dev_set_promiscuity(slave->dev, inc);
642 if (err)
643 return err;
644 }
645 }
646 return err;
647 }
648
649 /* Push the allmulti flag down to all slaves */
650 static int bond_set_allmulti(struct bonding *bond, int inc)
651 {
652 struct list_head *iter;
653 int err = 0;
654
655 if (bond_uses_primary(bond)) {
656 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
657
658 if (curr_active)
659 err = dev_set_allmulti(curr_active->dev, inc);
660 } else {
661 struct slave *slave;
662
663 bond_for_each_slave(bond, slave, iter) {
664 err = dev_set_allmulti(slave->dev, inc);
665 if (err)
666 return err;
667 }
668 }
669 return err;
670 }
671
672 /* Retrieve the list of registered multicast addresses for the bonding
673 * device and retransmit an IGMP JOIN request to the current active
674 * slave.
675 */
676 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
677 {
678 struct bonding *bond = container_of(work, struct bonding,
679 mcast_work.work);
680
681 if (!rtnl_trylock()) {
682 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
683 return;
684 }
685 call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
686
687 if (bond->igmp_retrans > 1) {
688 bond->igmp_retrans--;
689 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
690 }
691 rtnl_unlock();
692 }
693
694 /* Flush bond's hardware addresses from slave */
695 static void bond_hw_addr_flush(struct net_device *bond_dev,
696 struct net_device *slave_dev)
697 {
698 struct bonding *bond = netdev_priv(bond_dev);
699
700 dev_uc_unsync(slave_dev, bond_dev);
701 dev_mc_unsync(slave_dev, bond_dev);
702
703 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
704 /* del lacpdu mc addr from mc list */
705 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
706
707 dev_mc_del(slave_dev, lacpdu_multicast);
708 }
709 }
710
711 /*--------------------------- Active slave change ---------------------------*/
712
713 /* Update the hardware address list and promisc/allmulti for the new and
714 * old active slaves (if any). Modes that are not using primary keep all
715 * slaves up date at all times; only the modes that use primary need to call
716 * this function to swap these settings during a failover.
717 */
718 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
719 struct slave *old_active)
720 {
721 if (old_active) {
722 if (bond->dev->flags & IFF_PROMISC)
723 dev_set_promiscuity(old_active->dev, -1);
724
725 if (bond->dev->flags & IFF_ALLMULTI)
726 dev_set_allmulti(old_active->dev, -1);
727
728 bond_hw_addr_flush(bond->dev, old_active->dev);
729 }
730
731 if (new_active) {
732 /* FIXME: Signal errors upstream. */
733 if (bond->dev->flags & IFF_PROMISC)
734 dev_set_promiscuity(new_active->dev, 1);
735
736 if (bond->dev->flags & IFF_ALLMULTI)
737 dev_set_allmulti(new_active->dev, 1);
738
739 netif_addr_lock_bh(bond->dev);
740 dev_uc_sync(new_active->dev, bond->dev);
741 dev_mc_sync(new_active->dev, bond->dev);
742 netif_addr_unlock_bh(bond->dev);
743 }
744 }
745
746 /**
747 * bond_set_dev_addr - clone slave's address to bond
748 * @bond_dev: bond net device
749 * @slave_dev: slave net device
750 *
751 * Should be called with RTNL held.
752 */
753 static int bond_set_dev_addr(struct net_device *bond_dev,
754 struct net_device *slave_dev)
755 {
756 int err;
757
758 slave_dbg(bond_dev, slave_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
759 bond_dev, slave_dev, slave_dev->addr_len);
760 err = dev_pre_changeaddr_notify(bond_dev, slave_dev->dev_addr, NULL);
761 if (err)
762 return err;
763
764 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
765 bond_dev->addr_assign_type = NET_ADDR_STOLEN;
766 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
767 return 0;
768 }
769
770 static struct slave *bond_get_old_active(struct bonding *bond,
771 struct slave *new_active)
772 {
773 struct slave *slave;
774 struct list_head *iter;
775
776 bond_for_each_slave(bond, slave, iter) {
777 if (slave == new_active)
778 continue;
779
780 if (ether_addr_equal(bond->dev->dev_addr, slave->dev->dev_addr))
781 return slave;
782 }
783
784 return NULL;
785 }
786
787 /* bond_do_fail_over_mac
788 *
789 * Perform special MAC address swapping for fail_over_mac settings
790 *
791 * Called with RTNL
792 */
793 static void bond_do_fail_over_mac(struct bonding *bond,
794 struct slave *new_active,
795 struct slave *old_active)
796 {
797 u8 tmp_mac[MAX_ADDR_LEN];
798 struct sockaddr_storage ss;
799 int rv;
800
801 switch (bond->params.fail_over_mac) {
802 case BOND_FOM_ACTIVE:
803 if (new_active) {
804 rv = bond_set_dev_addr(bond->dev, new_active->dev);
805 if (rv)
806 slave_err(bond->dev, new_active->dev, "Error %d setting bond MAC from slave\n",
807 -rv);
808 }
809 break;
810 case BOND_FOM_FOLLOW:
811 /* if new_active && old_active, swap them
812 * if just old_active, do nothing (going to no active slave)
813 * if just new_active, set new_active to bond's MAC
814 */
815 if (!new_active)
816 return;
817
818 if (!old_active)
819 old_active = bond_get_old_active(bond, new_active);
820
821 if (old_active) {
822 bond_hw_addr_copy(tmp_mac, new_active->dev->dev_addr,
823 new_active->dev->addr_len);
824 bond_hw_addr_copy(ss.__data,
825 old_active->dev->dev_addr,
826 old_active->dev->addr_len);
827 ss.ss_family = new_active->dev->type;
828 } else {
829 bond_hw_addr_copy(ss.__data, bond->dev->dev_addr,
830 bond->dev->addr_len);
831 ss.ss_family = bond->dev->type;
832 }
833
834 rv = dev_set_mac_address(new_active->dev,
835 (struct sockaddr *)&ss, NULL);
836 if (rv) {
837 slave_err(bond->dev, new_active->dev, "Error %d setting MAC of new active slave\n",
838 -rv);
839 goto out;
840 }
841
842 if (!old_active)
843 goto out;
844
845 bond_hw_addr_copy(ss.__data, tmp_mac,
846 new_active->dev->addr_len);
847 ss.ss_family = old_active->dev->type;
848
849 rv = dev_set_mac_address(old_active->dev,
850 (struct sockaddr *)&ss, NULL);
851 if (rv)
852 slave_err(bond->dev, old_active->dev, "Error %d setting MAC of old active slave\n",
853 -rv);
854 out:
855 break;
856 default:
857 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
858 bond->params.fail_over_mac);
859 break;
860 }
861
862 }
863
864 static struct slave *bond_choose_primary_or_current(struct bonding *bond)
865 {
866 struct slave *prim = rtnl_dereference(bond->primary_slave);
867 struct slave *curr = rtnl_dereference(bond->curr_active_slave);
868
869 if (!prim || prim->link != BOND_LINK_UP) {
870 if (!curr || curr->link != BOND_LINK_UP)
871 return NULL;
872 return curr;
873 }
874
875 if (bond->force_primary) {
876 bond->force_primary = false;
877 return prim;
878 }
879
880 if (!curr || curr->link != BOND_LINK_UP)
881 return prim;
882
883 /* At this point, prim and curr are both up */
884 switch (bond->params.primary_reselect) {
885 case BOND_PRI_RESELECT_ALWAYS:
886 return prim;
887 case BOND_PRI_RESELECT_BETTER:
888 if (prim->speed < curr->speed)
889 return curr;
890 if (prim->speed == curr->speed && prim->duplex <= curr->duplex)
891 return curr;
892 return prim;
893 case BOND_PRI_RESELECT_FAILURE:
894 return curr;
895 default:
896 netdev_err(bond->dev, "impossible primary_reselect %d\n",
897 bond->params.primary_reselect);
898 return curr;
899 }
900 }
901
902 /**
903 * bond_find_best_slave - select the best available slave to be the active one
904 * @bond: our bonding struct
905 */
906 static struct slave *bond_find_best_slave(struct bonding *bond)
907 {
908 struct slave *slave, *bestslave = NULL;
909 struct list_head *iter;
910 int mintime = bond->params.updelay;
911
912 slave = bond_choose_primary_or_current(bond);
913 if (slave)
914 return slave;
915
916 bond_for_each_slave(bond, slave, iter) {
917 if (slave->link == BOND_LINK_UP)
918 return slave;
919 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
920 slave->delay < mintime) {
921 mintime = slave->delay;
922 bestslave = slave;
923 }
924 }
925
926 return bestslave;
927 }
928
929 static bool bond_should_notify_peers(struct bonding *bond)
930 {
931 struct slave *slave;
932
933 rcu_read_lock();
934 slave = rcu_dereference(bond->curr_active_slave);
935 rcu_read_unlock();
936
937 netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
938 slave ? slave->dev->name : "NULL");
939
940 if (!slave || !bond->send_peer_notif ||
941 bond->send_peer_notif %
942 max(1, bond->params.peer_notif_delay) != 0 ||
943 !netif_carrier_ok(bond->dev) ||
944 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
945 return false;
946
947 return true;
948 }
949
950 /**
951 * change_active_interface - change the active slave into the specified one
952 * @bond: our bonding struct
953 * @new_active: the new slave to make the active one
954 *
955 * Set the new slave to the bond's settings and unset them on the old
956 * curr_active_slave.
957 * Setting include flags, mc-list, promiscuity, allmulti, etc.
958 *
959 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
960 * because it is apparently the best available slave we have, even though its
961 * updelay hasn't timed out yet.
962 *
963 * Caller must hold RTNL.
964 */
965 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
966 {
967 struct slave *old_active;
968
969 ASSERT_RTNL();
970
971 old_active = rtnl_dereference(bond->curr_active_slave);
972
973 if (old_active == new_active)
974 return;
975
976 #ifdef CONFIG_XFRM_OFFLOAD
977 if (old_active && bond->xs)
978 bond_ipsec_del_sa(bond->xs);
979 #endif /* CONFIG_XFRM_OFFLOAD */
980
981 if (new_active) {
982 new_active->last_link_up = jiffies;
983
984 if (new_active->link == BOND_LINK_BACK) {
985 if (bond_uses_primary(bond)) {
986 slave_info(bond->dev, new_active->dev, "making interface the new active one %d ms earlier\n",
987 (bond->params.updelay - new_active->delay) * bond->params.miimon);
988 }
989
990 new_active->delay = 0;
991 bond_set_slave_link_state(new_active, BOND_LINK_UP,
992 BOND_SLAVE_NOTIFY_NOW);
993
994 if (BOND_MODE(bond) == BOND_MODE_8023AD)
995 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
996
997 if (bond_is_lb(bond))
998 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
999 } else {
1000 if (bond_uses_primary(bond)) {
1001 slave_info(bond->dev, new_active->dev, "making interface the new active one\n");
1002 }
1003 }
1004 }
1005
1006 if (bond_uses_primary(bond))
1007 bond_hw_addr_swap(bond, new_active, old_active);
1008
1009 if (bond_is_lb(bond)) {
1010 bond_alb_handle_active_change(bond, new_active);
1011 if (old_active)
1012 bond_set_slave_inactive_flags(old_active,
1013 BOND_SLAVE_NOTIFY_NOW);
1014 if (new_active)
1015 bond_set_slave_active_flags(new_active,
1016 BOND_SLAVE_NOTIFY_NOW);
1017 } else {
1018 rcu_assign_pointer(bond->curr_active_slave, new_active);
1019 }
1020
1021 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
1022 if (old_active)
1023 bond_set_slave_inactive_flags(old_active,
1024 BOND_SLAVE_NOTIFY_NOW);
1025
1026 if (new_active) {
1027 bool should_notify_peers = false;
1028
1029 bond_set_slave_active_flags(new_active,
1030 BOND_SLAVE_NOTIFY_NOW);
1031
1032 if (bond->params.fail_over_mac)
1033 bond_do_fail_over_mac(bond, new_active,
1034 old_active);
1035
1036 if (netif_running(bond->dev)) {
1037 bond->send_peer_notif =
1038 bond->params.num_peer_notif *
1039 max(1, bond->params.peer_notif_delay);
1040 should_notify_peers =
1041 bond_should_notify_peers(bond);
1042 }
1043
1044 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
1045 if (should_notify_peers) {
1046 bond->send_peer_notif--;
1047 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
1048 bond->dev);
1049 }
1050 }
1051 }
1052
1053 #ifdef CONFIG_XFRM_OFFLOAD
1054 if (new_active && bond->xs) {
1055 xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
1056 bond_ipsec_add_sa(bond->xs);
1057 }
1058 #endif /* CONFIG_XFRM_OFFLOAD */
1059
1060 /* resend IGMP joins since active slave has changed or
1061 * all were sent on curr_active_slave.
1062 * resend only if bond is brought up with the affected
1063 * bonding modes and the retransmission is enabled
1064 */
1065 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1066 ((bond_uses_primary(bond) && new_active) ||
1067 BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
1068 bond->igmp_retrans = bond->params.resend_igmp;
1069 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
1070 }
1071 }
1072
1073 /**
1074 * bond_select_active_slave - select a new active slave, if needed
1075 * @bond: our bonding struct
1076 *
1077 * This functions should be called when one of the following occurs:
1078 * - The old curr_active_slave has been released or lost its link.
1079 * - The primary_slave has got its link back.
1080 * - A slave has got its link back and there's no old curr_active_slave.
1081 *
1082 * Caller must hold RTNL.
1083 */
1084 void bond_select_active_slave(struct bonding *bond)
1085 {
1086 struct slave *best_slave;
1087 int rv;
1088
1089 ASSERT_RTNL();
1090
1091 best_slave = bond_find_best_slave(bond);
1092 if (best_slave != rtnl_dereference(bond->curr_active_slave)) {
1093 bond_change_active_slave(bond, best_slave);
1094 rv = bond_set_carrier(bond);
1095 if (!rv)
1096 return;
1097
1098 if (netif_carrier_ok(bond->dev))
1099 netdev_info(bond->dev, "active interface up!\n");
1100 else
1101 netdev_info(bond->dev, "now running without any active interface!\n");
1102 }
1103 }
1104
1105 #ifdef CONFIG_NET_POLL_CONTROLLER
1106 static inline int slave_enable_netpoll(struct slave *slave)
1107 {
1108 struct netpoll *np;
1109 int err = 0;
1110
1111 np = kzalloc(sizeof(*np), GFP_KERNEL);
1112 err = -ENOMEM;
1113 if (!np)
1114 goto out;
1115
1116 err = __netpoll_setup(np, slave->dev);
1117 if (err) {
1118 kfree(np);
1119 goto out;
1120 }
1121 slave->np = np;
1122 out:
1123 return err;
1124 }
1125 static inline void slave_disable_netpoll(struct slave *slave)
1126 {
1127 struct netpoll *np = slave->np;
1128
1129 if (!np)
1130 return;
1131
1132 slave->np = NULL;
1133
1134 __netpoll_free(np);
1135 }
1136
1137 static void bond_poll_controller(struct net_device *bond_dev)
1138 {
1139 struct bonding *bond = netdev_priv(bond_dev);
1140 struct slave *slave = NULL;
1141 struct list_head *iter;
1142 struct ad_info ad_info;
1143
1144 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1145 if (bond_3ad_get_active_agg_info(bond, &ad_info))
1146 return;
1147
1148 bond_for_each_slave_rcu(bond, slave, iter) {
1149 if (!bond_slave_is_up(slave))
1150 continue;
1151
1152 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1153 struct aggregator *agg =
1154 SLAVE_AD_INFO(slave)->port.aggregator;
1155
1156 if (agg &&
1157 agg->aggregator_identifier != ad_info.aggregator_id)
1158 continue;
1159 }
1160
1161 netpoll_poll_dev(slave->dev);
1162 }
1163 }
1164
1165 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1166 {
1167 struct bonding *bond = netdev_priv(bond_dev);
1168 struct list_head *iter;
1169 struct slave *slave;
1170
1171 bond_for_each_slave(bond, slave, iter)
1172 if (bond_slave_is_up(slave))
1173 slave_disable_netpoll(slave);
1174 }
1175
1176 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1177 {
1178 struct bonding *bond = netdev_priv(dev);
1179 struct list_head *iter;
1180 struct slave *slave;
1181 int err = 0;
1182
1183 bond_for_each_slave(bond, slave, iter) {
1184 err = slave_enable_netpoll(slave);
1185 if (err) {
1186 bond_netpoll_cleanup(dev);
1187 break;
1188 }
1189 }
1190 return err;
1191 }
1192 #else
1193 static inline int slave_enable_netpoll(struct slave *slave)
1194 {
1195 return 0;
1196 }
1197 static inline void slave_disable_netpoll(struct slave *slave)
1198 {
1199 }
1200 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1201 {
1202 }
1203 #endif
1204
1205 /*---------------------------------- IOCTL ----------------------------------*/
1206
1207 static netdev_features_t bond_fix_features(struct net_device *dev,
1208 netdev_features_t features)
1209 {
1210 struct bonding *bond = netdev_priv(dev);
1211 struct list_head *iter;
1212 netdev_features_t mask;
1213 struct slave *slave;
1214
1215 mask = features;
1216
1217 features &= ~NETIF_F_ONE_FOR_ALL;
1218 features |= NETIF_F_ALL_FOR_ALL;
1219
1220 bond_for_each_slave(bond, slave, iter) {
1221 features = netdev_increment_features(features,
1222 slave->dev->features,
1223 mask);
1224 }
1225 features = netdev_add_tso_features(features, mask);
1226
1227 return features;
1228 }
1229
1230 #define BOND_VLAN_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1231 NETIF_F_FRAGLIST | NETIF_F_GSO_SOFTWARE | \
1232 NETIF_F_HIGHDMA | NETIF_F_LRO)
1233
1234 #define BOND_ENC_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1235 NETIF_F_RXCSUM | NETIF_F_GSO_SOFTWARE)
1236
1237 #define BOND_MPLS_FEATURES (NETIF_F_HW_CSUM | NETIF_F_SG | \
1238 NETIF_F_GSO_SOFTWARE)
1239
1240
1241 static void bond_compute_features(struct bonding *bond)
1242 {
1243 unsigned int dst_release_flag = IFF_XMIT_DST_RELEASE |
1244 IFF_XMIT_DST_RELEASE_PERM;
1245 netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1246 netdev_features_t enc_features = BOND_ENC_FEATURES;
1247 #ifdef CONFIG_XFRM_OFFLOAD
1248 netdev_features_t xfrm_features = BOND_XFRM_FEATURES;
1249 #endif /* CONFIG_XFRM_OFFLOAD */
1250 netdev_features_t mpls_features = BOND_MPLS_FEATURES;
1251 struct net_device *bond_dev = bond->dev;
1252 struct list_head *iter;
1253 struct slave *slave;
1254 unsigned short max_hard_header_len = ETH_HLEN;
1255 unsigned int gso_max_size = GSO_MAX_SIZE;
1256 u16 gso_max_segs = GSO_MAX_SEGS;
1257
1258 if (!bond_has_slaves(bond))
1259 goto done;
1260 vlan_features &= NETIF_F_ALL_FOR_ALL;
1261 mpls_features &= NETIF_F_ALL_FOR_ALL;
1262
1263 bond_for_each_slave(bond, slave, iter) {
1264 vlan_features = netdev_increment_features(vlan_features,
1265 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1266
1267 enc_features = netdev_increment_features(enc_features,
1268 slave->dev->hw_enc_features,
1269 BOND_ENC_FEATURES);
1270
1271 #ifdef CONFIG_XFRM_OFFLOAD
1272 xfrm_features = netdev_increment_features(xfrm_features,
1273 slave->dev->hw_enc_features,
1274 BOND_XFRM_FEATURES);
1275 #endif /* CONFIG_XFRM_OFFLOAD */
1276
1277 mpls_features = netdev_increment_features(mpls_features,
1278 slave->dev->mpls_features,
1279 BOND_MPLS_FEATURES);
1280
1281 dst_release_flag &= slave->dev->priv_flags;
1282 if (slave->dev->hard_header_len > max_hard_header_len)
1283 max_hard_header_len = slave->dev->hard_header_len;
1284
1285 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1286 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1287 }
1288 bond_dev->hard_header_len = max_hard_header_len;
1289
1290 done:
1291 bond_dev->vlan_features = vlan_features;
1292 bond_dev->hw_enc_features = enc_features | NETIF_F_GSO_ENCAP_ALL |
1293 NETIF_F_HW_VLAN_CTAG_TX |
1294 NETIF_F_HW_VLAN_STAG_TX;
1295 #ifdef CONFIG_XFRM_OFFLOAD
1296 bond_dev->hw_enc_features |= xfrm_features;
1297 #endif /* CONFIG_XFRM_OFFLOAD */
1298 bond_dev->mpls_features = mpls_features;
1299 bond_dev->gso_max_segs = gso_max_segs;
1300 netif_set_gso_max_size(bond_dev, gso_max_size);
1301
1302 bond_dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1303 if ((bond_dev->priv_flags & IFF_XMIT_DST_RELEASE_PERM) &&
1304 dst_release_flag == (IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM))
1305 bond_dev->priv_flags |= IFF_XMIT_DST_RELEASE;
1306
1307 netdev_change_features(bond_dev);
1308 }
1309
1310 static void bond_setup_by_slave(struct net_device *bond_dev,
1311 struct net_device *slave_dev)
1312 {
1313 bond_dev->header_ops = slave_dev->header_ops;
1314
1315 bond_dev->type = slave_dev->type;
1316 bond_dev->hard_header_len = slave_dev->hard_header_len;
1317 bond_dev->needed_headroom = slave_dev->needed_headroom;
1318 bond_dev->addr_len = slave_dev->addr_len;
1319
1320 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1321 slave_dev->addr_len);
1322 }
1323
1324 /* On bonding slaves other than the currently active slave, suppress
1325 * duplicates except for alb non-mcast/bcast.
1326 */
1327 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1328 struct slave *slave,
1329 struct bonding *bond)
1330 {
1331 if (bond_is_slave_inactive(slave)) {
1332 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1333 skb->pkt_type != PACKET_BROADCAST &&
1334 skb->pkt_type != PACKET_MULTICAST)
1335 return false;
1336 return true;
1337 }
1338 return false;
1339 }
1340
1341 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1342 {
1343 struct sk_buff *skb = *pskb;
1344 struct slave *slave;
1345 struct bonding *bond;
1346 int (*recv_probe)(const struct sk_buff *, struct bonding *,
1347 struct slave *);
1348 int ret = RX_HANDLER_ANOTHER;
1349
1350 skb = skb_share_check(skb, GFP_ATOMIC);
1351 if (unlikely(!skb))
1352 return RX_HANDLER_CONSUMED;
1353
1354 *pskb = skb;
1355
1356 slave = bond_slave_get_rcu(skb->dev);
1357 bond = slave->bond;
1358
1359 recv_probe = READ_ONCE(bond->recv_probe);
1360 if (recv_probe) {
1361 ret = recv_probe(skb, bond, slave);
1362 if (ret == RX_HANDLER_CONSUMED) {
1363 consume_skb(skb);
1364 return ret;
1365 }
1366 }
1367
1368 /*
1369 * For packets determined by bond_should_deliver_exact_match() call to
1370 * be suppressed we want to make an exception for link-local packets.
1371 * This is necessary for e.g. LLDP daemons to be able to monitor
1372 * inactive slave links without being forced to bind to them
1373 * explicitly.
1374 *
1375 * At the same time, packets that are passed to the bonding master
1376 * (including link-local ones) can have their originating interface
1377 * determined via PACKET_ORIGDEV socket option.
1378 */
1379 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1380 if (is_link_local_ether_addr(eth_hdr(skb)->h_dest))
1381 return RX_HANDLER_PASS;
1382 return RX_HANDLER_EXACT;
1383 }
1384
1385 skb->dev = bond->dev;
1386
1387 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1388 netif_is_bridge_port(bond->dev) &&
1389 skb->pkt_type == PACKET_HOST) {
1390
1391 if (unlikely(skb_cow_head(skb,
1392 skb->data - skb_mac_header(skb)))) {
1393 kfree_skb(skb);
1394 return RX_HANDLER_CONSUMED;
1395 }
1396 bond_hw_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr,
1397 bond->dev->addr_len);
1398 }
1399
1400 return ret;
1401 }
1402
1403 static enum netdev_lag_tx_type bond_lag_tx_type(struct bonding *bond)
1404 {
1405 switch (BOND_MODE(bond)) {
1406 case BOND_MODE_ROUNDROBIN:
1407 return NETDEV_LAG_TX_TYPE_ROUNDROBIN;
1408 case BOND_MODE_ACTIVEBACKUP:
1409 return NETDEV_LAG_TX_TYPE_ACTIVEBACKUP;
1410 case BOND_MODE_BROADCAST:
1411 return NETDEV_LAG_TX_TYPE_BROADCAST;
1412 case BOND_MODE_XOR:
1413 case BOND_MODE_8023AD:
1414 return NETDEV_LAG_TX_TYPE_HASH;
1415 default:
1416 return NETDEV_LAG_TX_TYPE_UNKNOWN;
1417 }
1418 }
1419
1420 static enum netdev_lag_hash bond_lag_hash_type(struct bonding *bond,
1421 enum netdev_lag_tx_type type)
1422 {
1423 if (type != NETDEV_LAG_TX_TYPE_HASH)
1424 return NETDEV_LAG_HASH_NONE;
1425
1426 switch (bond->params.xmit_policy) {
1427 case BOND_XMIT_POLICY_LAYER2:
1428 return NETDEV_LAG_HASH_L2;
1429 case BOND_XMIT_POLICY_LAYER34:
1430 return NETDEV_LAG_HASH_L34;
1431 case BOND_XMIT_POLICY_LAYER23:
1432 return NETDEV_LAG_HASH_L23;
1433 case BOND_XMIT_POLICY_ENCAP23:
1434 return NETDEV_LAG_HASH_E23;
1435 case BOND_XMIT_POLICY_ENCAP34:
1436 return NETDEV_LAG_HASH_E34;
1437 default:
1438 return NETDEV_LAG_HASH_UNKNOWN;
1439 }
1440 }
1441
1442 static int bond_master_upper_dev_link(struct bonding *bond, struct slave *slave,
1443 struct netlink_ext_ack *extack)
1444 {
1445 struct netdev_lag_upper_info lag_upper_info;
1446 enum netdev_lag_tx_type type;
1447
1448 type = bond_lag_tx_type(bond);
1449 lag_upper_info.tx_type = type;
1450 lag_upper_info.hash_type = bond_lag_hash_type(bond, type);
1451
1452 return netdev_master_upper_dev_link(slave->dev, bond->dev, slave,
1453 &lag_upper_info, extack);
1454 }
1455
1456 static void bond_upper_dev_unlink(struct bonding *bond, struct slave *slave)
1457 {
1458 netdev_upper_dev_unlink(slave->dev, bond->dev);
1459 slave->dev->flags &= ~IFF_SLAVE;
1460 }
1461
1462 static void slave_kobj_release(struct kobject *kobj)
1463 {
1464 struct slave *slave = to_slave(kobj);
1465 struct bonding *bond = bond_get_bond_by_slave(slave);
1466
1467 cancel_delayed_work_sync(&slave->notify_work);
1468 if (BOND_MODE(bond) == BOND_MODE_8023AD)
1469 kfree(SLAVE_AD_INFO(slave));
1470
1471 kfree(slave);
1472 }
1473
1474 static struct kobj_type slave_ktype = {
1475 .release = slave_kobj_release,
1476 #ifdef CONFIG_SYSFS
1477 .sysfs_ops = &slave_sysfs_ops,
1478 #endif
1479 };
1480
1481 static int bond_kobj_init(struct slave *slave)
1482 {
1483 int err;
1484
1485 err = kobject_init_and_add(&slave->kobj, &slave_ktype,
1486 &(slave->dev->dev.kobj), "bonding_slave");
1487 if (err)
1488 kobject_put(&slave->kobj);
1489
1490 return err;
1491 }
1492
1493 static struct slave *bond_alloc_slave(struct bonding *bond,
1494 struct net_device *slave_dev)
1495 {
1496 struct slave *slave = NULL;
1497
1498 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
1499 if (!slave)
1500 return NULL;
1501
1502 slave->bond = bond;
1503 slave->dev = slave_dev;
1504
1505 if (bond_kobj_init(slave))
1506 return NULL;
1507
1508 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1509 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1510 GFP_KERNEL);
1511 if (!SLAVE_AD_INFO(slave)) {
1512 kobject_put(&slave->kobj);
1513 return NULL;
1514 }
1515 }
1516 INIT_DELAYED_WORK(&slave->notify_work, bond_netdev_notify_work);
1517
1518 return slave;
1519 }
1520
1521 static void bond_fill_ifbond(struct bonding *bond, struct ifbond *info)
1522 {
1523 info->bond_mode = BOND_MODE(bond);
1524 info->miimon = bond->params.miimon;
1525 info->num_slaves = bond->slave_cnt;
1526 }
1527
1528 static void bond_fill_ifslave(struct slave *slave, struct ifslave *info)
1529 {
1530 strcpy(info->slave_name, slave->dev->name);
1531 info->link = slave->link;
1532 info->state = bond_slave_state(slave);
1533 info->link_failure_count = slave->link_failure_count;
1534 }
1535
1536 static void bond_netdev_notify_work(struct work_struct *_work)
1537 {
1538 struct slave *slave = container_of(_work, struct slave,
1539 notify_work.work);
1540
1541 if (rtnl_trylock()) {
1542 struct netdev_bonding_info binfo;
1543
1544 bond_fill_ifslave(slave, &binfo.slave);
1545 bond_fill_ifbond(slave->bond, &binfo.master);
1546 netdev_bonding_info_change(slave->dev, &binfo);
1547 rtnl_unlock();
1548 } else {
1549 queue_delayed_work(slave->bond->wq, &slave->notify_work, 1);
1550 }
1551 }
1552
1553 void bond_queue_slave_event(struct slave *slave)
1554 {
1555 queue_delayed_work(slave->bond->wq, &slave->notify_work, 0);
1556 }
1557
1558 void bond_lower_state_changed(struct slave *slave)
1559 {
1560 struct netdev_lag_lower_state_info info;
1561
1562 info.link_up = slave->link == BOND_LINK_UP ||
1563 slave->link == BOND_LINK_FAIL;
1564 info.tx_enabled = bond_is_active_slave(slave);
1565 netdev_lower_state_changed(slave->dev, &info);
1566 }
1567
1568 /* enslave device <slave> to bond device <master> */
1569 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
1570 struct netlink_ext_ack *extack)
1571 {
1572 struct bonding *bond = netdev_priv(bond_dev);
1573 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1574 struct slave *new_slave = NULL, *prev_slave;
1575 struct sockaddr_storage ss;
1576 int link_reporting;
1577 int res = 0, i;
1578
1579 if (!bond->params.use_carrier &&
1580 slave_dev->ethtool_ops->get_link == NULL &&
1581 slave_ops->ndo_do_ioctl == NULL) {
1582 slave_warn(bond_dev, slave_dev, "no link monitoring support\n");
1583 }
1584
1585 /* already in-use? */
1586 if (netdev_is_rx_handler_busy(slave_dev)) {
1587 NL_SET_ERR_MSG(extack, "Device is in use and cannot be enslaved");
1588 slave_err(bond_dev, slave_dev,
1589 "Error: Device is in use and cannot be enslaved\n");
1590 return -EBUSY;
1591 }
1592
1593 if (bond_dev == slave_dev) {
1594 NL_SET_ERR_MSG(extack, "Cannot enslave bond to itself.");
1595 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1596 return -EPERM;
1597 }
1598
1599 /* vlan challenged mutual exclusion */
1600 /* no need to lock since we're protected by rtnl_lock */
1601 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1602 slave_dbg(bond_dev, slave_dev, "is NETIF_F_VLAN_CHALLENGED\n");
1603 if (vlan_uses_dev(bond_dev)) {
1604 NL_SET_ERR_MSG(extack, "Can not enslave VLAN challenged device to VLAN enabled bond");
1605 slave_err(bond_dev, slave_dev, "Error: cannot enslave VLAN challenged slave on VLAN enabled bond\n");
1606 return -EPERM;
1607 } else {
1608 slave_warn(bond_dev, slave_dev, "enslaved VLAN challenged slave. Adding VLANs will be blocked as long as it is part of bond.\n");
1609 }
1610 } else {
1611 slave_dbg(bond_dev, slave_dev, "is !NETIF_F_VLAN_CHALLENGED\n");
1612 }
1613
1614 if (slave_dev->features & NETIF_F_HW_ESP)
1615 slave_dbg(bond_dev, slave_dev, "is esp-hw-offload capable\n");
1616
1617 /* Old ifenslave binaries are no longer supported. These can
1618 * be identified with moderate accuracy by the state of the slave:
1619 * the current ifenslave will set the interface down prior to
1620 * enslaving it; the old ifenslave will not.
1621 */
1622 if (slave_dev->flags & IFF_UP) {
1623 NL_SET_ERR_MSG(extack, "Device can not be enslaved while up");
1624 slave_err(bond_dev, slave_dev, "slave is up - this may be due to an out of date ifenslave\n");
1625 return -EPERM;
1626 }
1627
1628 /* set bonding device ether type by slave - bonding netdevices are
1629 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1630 * there is a need to override some of the type dependent attribs/funcs.
1631 *
1632 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1633 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1634 */
1635 if (!bond_has_slaves(bond)) {
1636 if (bond_dev->type != slave_dev->type) {
1637 slave_dbg(bond_dev, slave_dev, "change device type from %d to %d\n",
1638 bond_dev->type, slave_dev->type);
1639
1640 res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1641 bond_dev);
1642 res = notifier_to_errno(res);
1643 if (res) {
1644 slave_err(bond_dev, slave_dev, "refused to change device type\n");
1645 return -EBUSY;
1646 }
1647
1648 /* Flush unicast and multicast addresses */
1649 dev_uc_flush(bond_dev);
1650 dev_mc_flush(bond_dev);
1651
1652 if (slave_dev->type != ARPHRD_ETHER)
1653 bond_setup_by_slave(bond_dev, slave_dev);
1654 else {
1655 ether_setup(bond_dev);
1656 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1657 }
1658
1659 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1660 bond_dev);
1661 }
1662 } else if (bond_dev->type != slave_dev->type) {
1663 NL_SET_ERR_MSG(extack, "Device type is different from other slaves");
1664 slave_err(bond_dev, slave_dev, "ether type (%d) is different from other slaves (%d), can not enslave it\n",
1665 slave_dev->type, bond_dev->type);
1666 return -EINVAL;
1667 }
1668
1669 if (slave_dev->type == ARPHRD_INFINIBAND &&
1670 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1671 NL_SET_ERR_MSG(extack, "Only active-backup mode is supported for infiniband slaves");
1672 slave_warn(bond_dev, slave_dev, "Type (%d) supports only active-backup mode\n",
1673 slave_dev->type);
1674 res = -EOPNOTSUPP;
1675 goto err_undo_flags;
1676 }
1677
1678 if (!slave_ops->ndo_set_mac_address ||
1679 slave_dev->type == ARPHRD_INFINIBAND) {
1680 slave_warn(bond_dev, slave_dev, "The slave device specified does not support setting the MAC address\n");
1681 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1682 bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1683 if (!bond_has_slaves(bond)) {
1684 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1685 slave_warn(bond_dev, slave_dev, "Setting fail_over_mac to active for active-backup mode\n");
1686 } else {
1687 NL_SET_ERR_MSG(extack, "Slave device does not support setting the MAC address, but fail_over_mac is not set to active");
1688 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");
1689 res = -EOPNOTSUPP;
1690 goto err_undo_flags;
1691 }
1692 }
1693 }
1694
1695 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1696
1697 /* If this is the first slave, then we need to set the master's hardware
1698 * address to be the same as the slave's.
1699 */
1700 if (!bond_has_slaves(bond) &&
1701 bond->dev->addr_assign_type == NET_ADDR_RANDOM) {
1702 res = bond_set_dev_addr(bond->dev, slave_dev);
1703 if (res)
1704 goto err_undo_flags;
1705 }
1706
1707 new_slave = bond_alloc_slave(bond, slave_dev);
1708 if (!new_slave) {
1709 res = -ENOMEM;
1710 goto err_undo_flags;
1711 }
1712
1713 /* Set the new_slave's queue_id to be zero. Queue ID mapping
1714 * is set via sysfs or module option if desired.
1715 */
1716 new_slave->queue_id = 0;
1717
1718 /* Save slave's original mtu and then set it to match the bond */
1719 new_slave->original_mtu = slave_dev->mtu;
1720 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1721 if (res) {
1722 slave_err(bond_dev, slave_dev, "Error %d calling dev_set_mtu\n", res);
1723 goto err_free;
1724 }
1725
1726 /* Save slave's original ("permanent") mac address for modes
1727 * that need it, and for restoring it upon release, and then
1728 * set it to the master's address
1729 */
1730 bond_hw_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr,
1731 slave_dev->addr_len);
1732
1733 if (!bond->params.fail_over_mac ||
1734 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1735 /* Set slave to master's mac address. The application already
1736 * set the master's mac address to that of the first slave
1737 */
1738 memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
1739 ss.ss_family = slave_dev->type;
1740 res = dev_set_mac_address(slave_dev, (struct sockaddr *)&ss,
1741 extack);
1742 if (res) {
1743 slave_err(bond_dev, slave_dev, "Error %d calling set_mac_address\n", res);
1744 goto err_restore_mtu;
1745 }
1746 }
1747
1748 /* set slave flag before open to prevent IPv6 addrconf */
1749 slave_dev->flags |= IFF_SLAVE;
1750
1751 /* open the slave since the application closed it */
1752 res = dev_open(slave_dev, extack);
1753 if (res) {
1754 slave_err(bond_dev, slave_dev, "Opening slave failed\n");
1755 goto err_restore_mac;
1756 }
1757
1758 slave_dev->priv_flags |= IFF_BONDING;
1759 /* initialize slave stats */
1760 dev_get_stats(new_slave->dev, &new_slave->slave_stats);
1761
1762 if (bond_is_lb(bond)) {
1763 /* bond_alb_init_slave() must be called before all other stages since
1764 * it might fail and we do not want to have to undo everything
1765 */
1766 res = bond_alb_init_slave(bond, new_slave);
1767 if (res)
1768 goto err_close;
1769 }
1770
1771 res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1772 if (res) {
1773 slave_err(bond_dev, slave_dev, "Couldn't add bond vlan ids\n");
1774 goto err_close;
1775 }
1776
1777 prev_slave = bond_last_slave(bond);
1778
1779 new_slave->delay = 0;
1780 new_slave->link_failure_count = 0;
1781
1782 if (bond_update_speed_duplex(new_slave) &&
1783 bond_needs_speed_duplex(bond))
1784 new_slave->link = BOND_LINK_DOWN;
1785
1786 new_slave->last_rx = jiffies -
1787 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1788 for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1789 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1790
1791 if (bond->params.miimon && !bond->params.use_carrier) {
1792 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1793
1794 if ((link_reporting == -1) && !bond->params.arp_interval) {
1795 /* miimon is set but a bonded network driver
1796 * does not support ETHTOOL/MII and
1797 * arp_interval is not set. Note: if
1798 * use_carrier is enabled, we will never go
1799 * here (because netif_carrier is always
1800 * supported); thus, we don't need to change
1801 * the messages for netif_carrier.
1802 */
1803 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");
1804 } else if (link_reporting == -1) {
1805 /* unable get link status using mii/ethtool */
1806 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");
1807 }
1808 }
1809
1810 /* check for initial state */
1811 new_slave->link = BOND_LINK_NOCHANGE;
1812 if (bond->params.miimon) {
1813 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1814 if (bond->params.updelay) {
1815 bond_set_slave_link_state(new_slave,
1816 BOND_LINK_BACK,
1817 BOND_SLAVE_NOTIFY_NOW);
1818 new_slave->delay = bond->params.updelay;
1819 } else {
1820 bond_set_slave_link_state(new_slave,
1821 BOND_LINK_UP,
1822 BOND_SLAVE_NOTIFY_NOW);
1823 }
1824 } else {
1825 bond_set_slave_link_state(new_slave, BOND_LINK_DOWN,
1826 BOND_SLAVE_NOTIFY_NOW);
1827 }
1828 } else if (bond->params.arp_interval) {
1829 bond_set_slave_link_state(new_slave,
1830 (netif_carrier_ok(slave_dev) ?
1831 BOND_LINK_UP : BOND_LINK_DOWN),
1832 BOND_SLAVE_NOTIFY_NOW);
1833 } else {
1834 bond_set_slave_link_state(new_slave, BOND_LINK_UP,
1835 BOND_SLAVE_NOTIFY_NOW);
1836 }
1837
1838 if (new_slave->link != BOND_LINK_DOWN)
1839 new_slave->last_link_up = jiffies;
1840 slave_dbg(bond_dev, slave_dev, "Initial state of slave is BOND_LINK_%s\n",
1841 new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1842 (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1843
1844 if (bond_uses_primary(bond) && bond->params.primary[0]) {
1845 /* if there is a primary slave, remember it */
1846 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1847 rcu_assign_pointer(bond->primary_slave, new_slave);
1848 bond->force_primary = true;
1849 }
1850 }
1851
1852 switch (BOND_MODE(bond)) {
1853 case BOND_MODE_ACTIVEBACKUP:
1854 bond_set_slave_inactive_flags(new_slave,
1855 BOND_SLAVE_NOTIFY_NOW);
1856 break;
1857 case BOND_MODE_8023AD:
1858 /* in 802.3ad mode, the internal mechanism
1859 * will activate the slaves in the selected
1860 * aggregator
1861 */
1862 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1863 /* if this is the first slave */
1864 if (!prev_slave) {
1865 SLAVE_AD_INFO(new_slave)->id = 1;
1866 /* Initialize AD with the number of times that the AD timer is called in 1 second
1867 * can be called only after the mac address of the bond is set
1868 */
1869 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1870 } else {
1871 SLAVE_AD_INFO(new_slave)->id =
1872 SLAVE_AD_INFO(prev_slave)->id + 1;
1873 }
1874
1875 bond_3ad_bind_slave(new_slave);
1876 break;
1877 case BOND_MODE_TLB:
1878 case BOND_MODE_ALB:
1879 bond_set_active_slave(new_slave);
1880 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1881 break;
1882 default:
1883 slave_dbg(bond_dev, slave_dev, "This slave is always active in trunk mode\n");
1884
1885 /* always active in trunk mode */
1886 bond_set_active_slave(new_slave);
1887
1888 /* In trunking mode there is little meaning to curr_active_slave
1889 * anyway (it holds no special properties of the bond device),
1890 * so we can change it without calling change_active_interface()
1891 */
1892 if (!rcu_access_pointer(bond->curr_active_slave) &&
1893 new_slave->link == BOND_LINK_UP)
1894 rcu_assign_pointer(bond->curr_active_slave, new_slave);
1895
1896 break;
1897 } /* switch(bond_mode) */
1898
1899 #ifdef CONFIG_NET_POLL_CONTROLLER
1900 if (bond->dev->npinfo) {
1901 if (slave_enable_netpoll(new_slave)) {
1902 slave_info(bond_dev, slave_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1903 res = -EBUSY;
1904 goto err_detach;
1905 }
1906 }
1907 #endif
1908
1909 if (!(bond_dev->features & NETIF_F_LRO))
1910 dev_disable_lro(slave_dev);
1911
1912 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1913 new_slave);
1914 if (res) {
1915 slave_dbg(bond_dev, slave_dev, "Error %d calling netdev_rx_handler_register\n", res);
1916 goto err_detach;
1917 }
1918
1919 res = bond_master_upper_dev_link(bond, new_slave, extack);
1920 if (res) {
1921 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1922 goto err_unregister;
1923 }
1924
1925 res = bond_sysfs_slave_add(new_slave);
1926 if (res) {
1927 slave_dbg(bond_dev, slave_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1928 goto err_upper_unlink;
1929 }
1930
1931 /* If the mode uses primary, then the following is handled by
1932 * bond_change_active_slave().
1933 */
1934 if (!bond_uses_primary(bond)) {
1935 /* set promiscuity level to new slave */
1936 if (bond_dev->flags & IFF_PROMISC) {
1937 res = dev_set_promiscuity(slave_dev, 1);
1938 if (res)
1939 goto err_sysfs_del;
1940 }
1941
1942 /* set allmulti level to new slave */
1943 if (bond_dev->flags & IFF_ALLMULTI) {
1944 res = dev_set_allmulti(slave_dev, 1);
1945 if (res) {
1946 if (bond_dev->flags & IFF_PROMISC)
1947 dev_set_promiscuity(slave_dev, -1);
1948 goto err_sysfs_del;
1949 }
1950 }
1951
1952 netif_addr_lock_bh(bond_dev);
1953 dev_mc_sync_multiple(slave_dev, bond_dev);
1954 dev_uc_sync_multiple(slave_dev, bond_dev);
1955 netif_addr_unlock_bh(bond_dev);
1956
1957 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1958 /* add lacpdu mc addr to mc list */
1959 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1960
1961 dev_mc_add(slave_dev, lacpdu_multicast);
1962 }
1963 }
1964
1965 bond->slave_cnt++;
1966 bond_compute_features(bond);
1967 bond_set_carrier(bond);
1968
1969 if (bond_uses_primary(bond)) {
1970 block_netpoll_tx();
1971 bond_select_active_slave(bond);
1972 unblock_netpoll_tx();
1973 }
1974
1975 if (bond_mode_can_use_xmit_hash(bond))
1976 bond_update_slave_arr(bond, NULL);
1977
1978
1979 slave_info(bond_dev, slave_dev, "Enslaving as %s interface with %s link\n",
1980 bond_is_active_slave(new_slave) ? "an active" : "a backup",
1981 new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1982
1983 /* enslave is successful */
1984 bond_queue_slave_event(new_slave);
1985 return 0;
1986
1987 /* Undo stages on error */
1988 err_sysfs_del:
1989 bond_sysfs_slave_del(new_slave);
1990
1991 err_upper_unlink:
1992 bond_upper_dev_unlink(bond, new_slave);
1993
1994 err_unregister:
1995 netdev_rx_handler_unregister(slave_dev);
1996
1997 err_detach:
1998 vlan_vids_del_by_dev(slave_dev, bond_dev);
1999 if (rcu_access_pointer(bond->primary_slave) == new_slave)
2000 RCU_INIT_POINTER(bond->primary_slave, NULL);
2001 if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
2002 block_netpoll_tx();
2003 bond_change_active_slave(bond, NULL);
2004 bond_select_active_slave(bond);
2005 unblock_netpoll_tx();
2006 }
2007 /* either primary_slave or curr_active_slave might've changed */
2008 synchronize_rcu();
2009 slave_disable_netpoll(new_slave);
2010
2011 err_close:
2012 if (!netif_is_bond_master(slave_dev))
2013 slave_dev->priv_flags &= ~IFF_BONDING;
2014 dev_close(slave_dev);
2015
2016 err_restore_mac:
2017 slave_dev->flags &= ~IFF_SLAVE;
2018 if (!bond->params.fail_over_mac ||
2019 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2020 /* XXX TODO - fom follow mode needs to change master's
2021 * MAC if this slave's MAC is in use by the bond, or at
2022 * least print a warning.
2023 */
2024 bond_hw_addr_copy(ss.__data, new_slave->perm_hwaddr,
2025 new_slave->dev->addr_len);
2026 ss.ss_family = slave_dev->type;
2027 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2028 }
2029
2030 err_restore_mtu:
2031 dev_set_mtu(slave_dev, new_slave->original_mtu);
2032
2033 err_free:
2034 kobject_put(&new_slave->kobj);
2035
2036 err_undo_flags:
2037 /* Enslave of first slave has failed and we need to fix master's mac */
2038 if (!bond_has_slaves(bond)) {
2039 if (ether_addr_equal_64bits(bond_dev->dev_addr,
2040 slave_dev->dev_addr))
2041 eth_hw_addr_random(bond_dev);
2042 if (bond_dev->type != ARPHRD_ETHER) {
2043 dev_close(bond_dev);
2044 ether_setup(bond_dev);
2045 bond_dev->flags |= IFF_MASTER;
2046 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2047 }
2048 }
2049
2050 return res;
2051 }
2052
2053 /* Try to release the slave device <slave> from the bond device <master>
2054 * It is legal to access curr_active_slave without a lock because all the function
2055 * is RTNL-locked. If "all" is true it means that the function is being called
2056 * while destroying a bond interface and all slaves are being released.
2057 *
2058 * The rules for slave state should be:
2059 * for Active/Backup:
2060 * Active stays on all backups go down
2061 * for Bonded connections:
2062 * The first up interface should be left on and all others downed.
2063 */
2064 static int __bond_release_one(struct net_device *bond_dev,
2065 struct net_device *slave_dev,
2066 bool all, bool unregister)
2067 {
2068 struct bonding *bond = netdev_priv(bond_dev);
2069 struct slave *slave, *oldcurrent;
2070 struct sockaddr_storage ss;
2071 int old_flags = bond_dev->flags;
2072 netdev_features_t old_features = bond_dev->features;
2073
2074 /* slave is not a slave or master is not master of this slave */
2075 if (!(slave_dev->flags & IFF_SLAVE) ||
2076 !netdev_has_upper_dev(slave_dev, bond_dev)) {
2077 slave_dbg(bond_dev, slave_dev, "cannot release slave\n");
2078 return -EINVAL;
2079 }
2080
2081 block_netpoll_tx();
2082
2083 slave = bond_get_slave_by_dev(bond, slave_dev);
2084 if (!slave) {
2085 /* not a slave of this bond */
2086 slave_info(bond_dev, slave_dev, "interface not enslaved\n");
2087 unblock_netpoll_tx();
2088 return -EINVAL;
2089 }
2090
2091 bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
2092
2093 bond_sysfs_slave_del(slave);
2094
2095 /* recompute stats just before removing the slave */
2096 bond_get_stats(bond->dev, &bond->bond_stats);
2097
2098 bond_upper_dev_unlink(bond, slave);
2099 /* unregister rx_handler early so bond_handle_frame wouldn't be called
2100 * for this slave anymore.
2101 */
2102 netdev_rx_handler_unregister(slave_dev);
2103
2104 if (BOND_MODE(bond) == BOND_MODE_8023AD)
2105 bond_3ad_unbind_slave(slave);
2106
2107 if (bond_mode_can_use_xmit_hash(bond))
2108 bond_update_slave_arr(bond, slave);
2109
2110 slave_info(bond_dev, slave_dev, "Releasing %s interface\n",
2111 bond_is_active_slave(slave) ? "active" : "backup");
2112
2113 oldcurrent = rcu_access_pointer(bond->curr_active_slave);
2114
2115 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2116
2117 if (!all && (!bond->params.fail_over_mac ||
2118 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
2119 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
2120 bond_has_slaves(bond))
2121 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",
2122 slave->perm_hwaddr);
2123 }
2124
2125 if (rtnl_dereference(bond->primary_slave) == slave)
2126 RCU_INIT_POINTER(bond->primary_slave, NULL);
2127
2128 if (oldcurrent == slave)
2129 bond_change_active_slave(bond, NULL);
2130
2131 if (bond_is_lb(bond)) {
2132 /* Must be called only after the slave has been
2133 * detached from the list and the curr_active_slave
2134 * has been cleared (if our_slave == old_current),
2135 * but before a new active slave is selected.
2136 */
2137 bond_alb_deinit_slave(bond, slave);
2138 }
2139
2140 if (all) {
2141 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
2142 } else if (oldcurrent == slave) {
2143 /* Note that we hold RTNL over this sequence, so there
2144 * is no concern that another slave add/remove event
2145 * will interfere.
2146 */
2147 bond_select_active_slave(bond);
2148 }
2149
2150 if (!bond_has_slaves(bond)) {
2151 bond_set_carrier(bond);
2152 eth_hw_addr_random(bond_dev);
2153 }
2154
2155 unblock_netpoll_tx();
2156 synchronize_rcu();
2157 bond->slave_cnt--;
2158
2159 if (!bond_has_slaves(bond)) {
2160 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
2161 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
2162 }
2163
2164 bond_compute_features(bond);
2165 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2166 (old_features & NETIF_F_VLAN_CHALLENGED))
2167 slave_info(bond_dev, slave_dev, "last VLAN challenged slave left bond - VLAN blocking is removed\n");
2168
2169 vlan_vids_del_by_dev(slave_dev, bond_dev);
2170
2171 /* If the mode uses primary, then this case was handled above by
2172 * bond_change_active_slave(..., NULL)
2173 */
2174 if (!bond_uses_primary(bond)) {
2175 /* unset promiscuity level from slave
2176 * NOTE: The NETDEV_CHANGEADDR call above may change the value
2177 * of the IFF_PROMISC flag in the bond_dev, but we need the
2178 * value of that flag before that change, as that was the value
2179 * when this slave was attached, so we cache at the start of the
2180 * function and use it here. Same goes for ALLMULTI below
2181 */
2182 if (old_flags & IFF_PROMISC)
2183 dev_set_promiscuity(slave_dev, -1);
2184
2185 /* unset allmulti level from slave */
2186 if (old_flags & IFF_ALLMULTI)
2187 dev_set_allmulti(slave_dev, -1);
2188
2189 bond_hw_addr_flush(bond_dev, slave_dev);
2190 }
2191
2192 slave_disable_netpoll(slave);
2193
2194 /* close slave before restoring its mac address */
2195 dev_close(slave_dev);
2196
2197 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
2198 BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2199 /* restore original ("permanent") mac address */
2200 bond_hw_addr_copy(ss.__data, slave->perm_hwaddr,
2201 slave->dev->addr_len);
2202 ss.ss_family = slave_dev->type;
2203 dev_set_mac_address(slave_dev, (struct sockaddr *)&ss, NULL);
2204 }
2205
2206 if (unregister)
2207 __dev_set_mtu(slave_dev, slave->original_mtu);
2208 else
2209 dev_set_mtu(slave_dev, slave->original_mtu);
2210
2211 if (!netif_is_bond_master(slave_dev))
2212 slave_dev->priv_flags &= ~IFF_BONDING;
2213
2214 kobject_put(&slave->kobj);
2215
2216 return 0;
2217 }
2218
2219 /* A wrapper used because of ndo_del_link */
2220 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
2221 {
2222 return __bond_release_one(bond_dev, slave_dev, false, false);
2223 }
2224
2225 /* First release a slave and then destroy the bond if no more slaves are left.
2226 * Must be under rtnl_lock when this function is called.
2227 */
2228 static int bond_release_and_destroy(struct net_device *bond_dev,
2229 struct net_device *slave_dev)
2230 {
2231 struct bonding *bond = netdev_priv(bond_dev);
2232 int ret;
2233
2234 ret = __bond_release_one(bond_dev, slave_dev, false, true);
2235 if (ret == 0 && !bond_has_slaves(bond) &&
2236 bond_dev->reg_state != NETREG_UNREGISTERING) {
2237 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2238 netdev_info(bond_dev, "Destroying bond\n");
2239 bond_remove_proc_entry(bond);
2240 unregister_netdevice(bond_dev);
2241 }
2242 return ret;
2243 }
2244
2245 static void bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2246 {
2247 struct bonding *bond = netdev_priv(bond_dev);
2248 bond_fill_ifbond(bond, info);
2249 }
2250
2251 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2252 {
2253 struct bonding *bond = netdev_priv(bond_dev);
2254 struct list_head *iter;
2255 int i = 0, res = -ENODEV;
2256 struct slave *slave;
2257
2258 bond_for_each_slave(bond, slave, iter) {
2259 if (i++ == (int)info->slave_id) {
2260 res = 0;
2261 bond_fill_ifslave(slave, info);
2262 break;
2263 }
2264 }
2265
2266 return res;
2267 }
2268
2269 /*-------------------------------- Monitoring -------------------------------*/
2270
2271 /* called with rcu_read_lock() */
2272 static int bond_miimon_inspect(struct bonding *bond)
2273 {
2274 int link_state, commit = 0;
2275 struct list_head *iter;
2276 struct slave *slave;
2277 bool ignore_updelay;
2278
2279 ignore_updelay = !rcu_dereference(bond->curr_active_slave);
2280
2281 bond_for_each_slave_rcu(bond, slave, iter) {
2282 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2283
2284 link_state = bond_check_dev_link(bond, slave->dev, 0);
2285
2286 switch (slave->link) {
2287 case BOND_LINK_UP:
2288 if (link_state)
2289 continue;
2290
2291 bond_propose_link_state(slave, BOND_LINK_FAIL);
2292 commit++;
2293 slave->delay = bond->params.downdelay;
2294 if (slave->delay) {
2295 slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
2296 (BOND_MODE(bond) ==
2297 BOND_MODE_ACTIVEBACKUP) ?
2298 (bond_is_active_slave(slave) ?
2299 "active " : "backup ") : "",
2300 bond->params.downdelay * bond->params.miimon);
2301 }
2302 fallthrough;
2303 case BOND_LINK_FAIL:
2304 if (link_state) {
2305 /* recovered before downdelay expired */
2306 bond_propose_link_state(slave, BOND_LINK_UP);
2307 slave->last_link_up = jiffies;
2308 slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
2309 (bond->params.downdelay - slave->delay) *
2310 bond->params.miimon);
2311 commit++;
2312 continue;
2313 }
2314
2315 if (slave->delay <= 0) {
2316 bond_propose_link_state(slave, BOND_LINK_DOWN);
2317 commit++;
2318 continue;
2319 }
2320
2321 slave->delay--;
2322 break;
2323
2324 case BOND_LINK_DOWN:
2325 if (!link_state)
2326 continue;
2327
2328 bond_propose_link_state(slave, BOND_LINK_BACK);
2329 commit++;
2330 slave->delay = bond->params.updelay;
2331
2332 if (slave->delay) {
2333 slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
2334 ignore_updelay ? 0 :
2335 bond->params.updelay *
2336 bond->params.miimon);
2337 }
2338 fallthrough;
2339 case BOND_LINK_BACK:
2340 if (!link_state) {
2341 bond_propose_link_state(slave, BOND_LINK_DOWN);
2342 slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
2343 (bond->params.updelay - slave->delay) *
2344 bond->params.miimon);
2345 commit++;
2346 continue;
2347 }
2348
2349 if (ignore_updelay)
2350 slave->delay = 0;
2351
2352 if (slave->delay <= 0) {
2353 bond_propose_link_state(slave, BOND_LINK_UP);
2354 commit++;
2355 ignore_updelay = false;
2356 continue;
2357 }
2358
2359 slave->delay--;
2360 break;
2361 }
2362 }
2363
2364 return commit;
2365 }
2366
2367 static void bond_miimon_link_change(struct bonding *bond,
2368 struct slave *slave,
2369 char link)
2370 {
2371 switch (BOND_MODE(bond)) {
2372 case BOND_MODE_8023AD:
2373 bond_3ad_handle_link_change(slave, link);
2374 break;
2375 case BOND_MODE_TLB:
2376 case BOND_MODE_ALB:
2377 bond_alb_handle_link_change(bond, slave, link);
2378 break;
2379 case BOND_MODE_XOR:
2380 bond_update_slave_arr(bond, NULL);
2381 break;
2382 }
2383 }
2384
2385 static void bond_miimon_commit(struct bonding *bond)
2386 {
2387 struct list_head *iter;
2388 struct slave *slave, *primary;
2389
2390 bond_for_each_slave(bond, slave, iter) {
2391 switch (slave->link_new_state) {
2392 case BOND_LINK_NOCHANGE:
2393 /* For 802.3ad mode, check current slave speed and
2394 * duplex again in case its port was disabled after
2395 * invalid speed/duplex reporting but recovered before
2396 * link monitoring could make a decision on the actual
2397 * link status
2398 */
2399 if (BOND_MODE(bond) == BOND_MODE_8023AD &&
2400 slave->link == BOND_LINK_UP)
2401 bond_3ad_adapter_speed_duplex_changed(slave);
2402 continue;
2403
2404 case BOND_LINK_UP:
2405 if (bond_update_speed_duplex(slave) &&
2406 bond_needs_speed_duplex(bond)) {
2407 slave->link = BOND_LINK_DOWN;
2408 if (net_ratelimit())
2409 slave_warn(bond->dev, slave->dev,
2410 "failed to get link speed/duplex\n");
2411 continue;
2412 }
2413 bond_set_slave_link_state(slave, BOND_LINK_UP,
2414 BOND_SLAVE_NOTIFY_NOW);
2415 slave->last_link_up = jiffies;
2416
2417 primary = rtnl_dereference(bond->primary_slave);
2418 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2419 /* prevent it from being the active one */
2420 bond_set_backup_slave(slave);
2421 } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
2422 /* make it immediately active */
2423 bond_set_active_slave(slave);
2424 }
2425
2426 slave_info(bond->dev, slave->dev, "link status definitely up, %u Mbps %s duplex\n",
2427 slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2428 slave->duplex ? "full" : "half");
2429
2430 bond_miimon_link_change(bond, slave, BOND_LINK_UP);
2431
2432 if (!bond->curr_active_slave || slave == primary)
2433 goto do_failover;
2434
2435 continue;
2436
2437 case BOND_LINK_DOWN:
2438 if (slave->link_failure_count < UINT_MAX)
2439 slave->link_failure_count++;
2440
2441 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
2442 BOND_SLAVE_NOTIFY_NOW);
2443
2444 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2445 BOND_MODE(bond) == BOND_MODE_8023AD)
2446 bond_set_slave_inactive_flags(slave,
2447 BOND_SLAVE_NOTIFY_NOW);
2448
2449 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
2450
2451 bond_miimon_link_change(bond, slave, BOND_LINK_DOWN);
2452
2453 if (slave == rcu_access_pointer(bond->curr_active_slave))
2454 goto do_failover;
2455
2456 continue;
2457
2458 default:
2459 slave_err(bond->dev, slave->dev, "invalid new link %d on slave\n",
2460 slave->link_new_state);
2461 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2462
2463 continue;
2464 }
2465
2466 do_failover:
2467 block_netpoll_tx();
2468 bond_select_active_slave(bond);
2469 unblock_netpoll_tx();
2470 }
2471
2472 bond_set_carrier(bond);
2473 }
2474
2475 /* bond_mii_monitor
2476 *
2477 * Really a wrapper that splits the mii monitor into two phases: an
2478 * inspection, then (if inspection indicates something needs to be done)
2479 * an acquisition of appropriate locks followed by a commit phase to
2480 * implement whatever link state changes are indicated.
2481 */
2482 static void bond_mii_monitor(struct work_struct *work)
2483 {
2484 struct bonding *bond = container_of(work, struct bonding,
2485 mii_work.work);
2486 bool should_notify_peers = false;
2487 bool commit;
2488 unsigned long delay;
2489 struct slave *slave;
2490 struct list_head *iter;
2491
2492 delay = msecs_to_jiffies(bond->params.miimon);
2493
2494 if (!bond_has_slaves(bond))
2495 goto re_arm;
2496
2497 rcu_read_lock();
2498 should_notify_peers = bond_should_notify_peers(bond);
2499 commit = !!bond_miimon_inspect(bond);
2500 if (bond->send_peer_notif) {
2501 rcu_read_unlock();
2502 if (rtnl_trylock()) {
2503 bond->send_peer_notif--;
2504 rtnl_unlock();
2505 }
2506 } else {
2507 rcu_read_unlock();
2508 }
2509
2510 if (commit) {
2511 /* Race avoidance with bond_close cancel of workqueue */
2512 if (!rtnl_trylock()) {
2513 delay = 1;
2514 should_notify_peers = false;
2515 goto re_arm;
2516 }
2517
2518 bond_for_each_slave(bond, slave, iter) {
2519 bond_commit_link_state(slave, BOND_SLAVE_NOTIFY_LATER);
2520 }
2521 bond_miimon_commit(bond);
2522
2523 rtnl_unlock(); /* might sleep, hold no other locks */
2524 }
2525
2526 re_arm:
2527 if (bond->params.miimon)
2528 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2529
2530 if (should_notify_peers) {
2531 if (!rtnl_trylock())
2532 return;
2533 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2534 rtnl_unlock();
2535 }
2536 }
2537
2538 static int bond_upper_dev_walk(struct net_device *upper,
2539 struct netdev_nested_priv *priv)
2540 {
2541 __be32 ip = *(__be32 *)priv->data;
2542
2543 return ip == bond_confirm_addr(upper, 0, ip);
2544 }
2545
2546 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2547 {
2548 struct netdev_nested_priv priv = {
2549 .data = (void *)&ip,
2550 };
2551 bool ret = false;
2552
2553 if (ip == bond_confirm_addr(bond->dev, 0, ip))
2554 return true;
2555
2556 rcu_read_lock();
2557 if (netdev_walk_all_upper_dev_rcu(bond->dev, bond_upper_dev_walk, &priv))
2558 ret = true;
2559 rcu_read_unlock();
2560
2561 return ret;
2562 }
2563
2564 /* We go to the (large) trouble of VLAN tagging ARP frames because
2565 * switches in VLAN mode (especially if ports are configured as
2566 * "native" to a VLAN) might not pass non-tagged frames.
2567 */
2568 static void bond_arp_send(struct slave *slave, int arp_op, __be32 dest_ip,
2569 __be32 src_ip, struct bond_vlan_tag *tags)
2570 {
2571 struct sk_buff *skb;
2572 struct bond_vlan_tag *outer_tag = tags;
2573 struct net_device *slave_dev = slave->dev;
2574 struct net_device *bond_dev = slave->bond->dev;
2575
2576 slave_dbg(bond_dev, slave_dev, "arp %d on slave: dst %pI4 src %pI4\n",
2577 arp_op, &dest_ip, &src_ip);
2578
2579 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2580 NULL, slave_dev->dev_addr, NULL);
2581
2582 if (!skb) {
2583 net_err_ratelimited("ARP packet allocation failed\n");
2584 return;
2585 }
2586
2587 if (!tags || tags->vlan_proto == VLAN_N_VID)
2588 goto xmit;
2589
2590 tags++;
2591
2592 /* Go through all the tags backwards and add them to the packet */
2593 while (tags->vlan_proto != VLAN_N_VID) {
2594 if (!tags->vlan_id) {
2595 tags++;
2596 continue;
2597 }
2598
2599 slave_dbg(bond_dev, slave_dev, "inner tag: proto %X vid %X\n",
2600 ntohs(outer_tag->vlan_proto), tags->vlan_id);
2601 skb = vlan_insert_tag_set_proto(skb, tags->vlan_proto,
2602 tags->vlan_id);
2603 if (!skb) {
2604 net_err_ratelimited("failed to insert inner VLAN tag\n");
2605 return;
2606 }
2607
2608 tags++;
2609 }
2610 /* Set the outer tag */
2611 if (outer_tag->vlan_id) {
2612 slave_dbg(bond_dev, slave_dev, "outer tag: proto %X vid %X\n",
2613 ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2614 __vlan_hwaccel_put_tag(skb, outer_tag->vlan_proto,
2615 outer_tag->vlan_id);
2616 }
2617
2618 xmit:
2619 arp_xmit(skb);
2620 }
2621
2622 /* Validate the device path between the @start_dev and the @end_dev.
2623 * The path is valid if the @end_dev is reachable through device
2624 * stacking.
2625 * When the path is validated, collect any vlan information in the
2626 * path.
2627 */
2628 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2629 struct net_device *end_dev,
2630 int level)
2631 {
2632 struct bond_vlan_tag *tags;
2633 struct net_device *upper;
2634 struct list_head *iter;
2635
2636 if (start_dev == end_dev) {
2637 tags = kcalloc(level + 1, sizeof(*tags), GFP_ATOMIC);
2638 if (!tags)
2639 return ERR_PTR(-ENOMEM);
2640 tags[level].vlan_proto = VLAN_N_VID;
2641 return tags;
2642 }
2643
2644 netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2645 tags = bond_verify_device_path(upper, end_dev, level + 1);
2646 if (IS_ERR_OR_NULL(tags)) {
2647 if (IS_ERR(tags))
2648 return tags;
2649 continue;
2650 }
2651 if (is_vlan_dev(upper)) {
2652 tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2653 tags[level].vlan_id = vlan_dev_vlan_id(upper);
2654 }
2655
2656 return tags;
2657 }
2658
2659 return NULL;
2660 }
2661
2662 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2663 {
2664 struct rtable *rt;
2665 struct bond_vlan_tag *tags;
2666 __be32 *targets = bond->params.arp_targets, addr;
2667 int i;
2668
2669 for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2670 slave_dbg(bond->dev, slave->dev, "%s: target %pI4\n",
2671 __func__, &targets[i]);
2672 tags = NULL;
2673
2674 /* Find out through which dev should the packet go */
2675 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2676 RTO_ONLINK, 0);
2677 if (IS_ERR(rt)) {
2678 /* there's no route to target - try to send arp
2679 * probe to generate any traffic (arp_validate=0)
2680 */
2681 if (bond->params.arp_validate)
2682 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2683 bond->dev->name,
2684 &targets[i]);
2685 bond_arp_send(slave, ARPOP_REQUEST, targets[i],
2686 0, tags);
2687 continue;
2688 }
2689
2690 /* bond device itself */
2691 if (rt->dst.dev == bond->dev)
2692 goto found;
2693
2694 rcu_read_lock();
2695 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2696 rcu_read_unlock();
2697
2698 if (!IS_ERR_OR_NULL(tags))
2699 goto found;
2700
2701 /* Not our device - skip */
2702 slave_dbg(bond->dev, slave->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2703 &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2704
2705 ip_rt_put(rt);
2706 continue;
2707
2708 found:
2709 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2710 ip_rt_put(rt);
2711 bond_arp_send(slave, ARPOP_REQUEST, targets[i], addr, tags);
2712 kfree(tags);
2713 }
2714 }
2715
2716 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2717 {
2718 int i;
2719
2720 if (!sip || !bond_has_this_ip(bond, tip)) {
2721 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 tip %pI4 not found\n",
2722 __func__, &sip, &tip);
2723 return;
2724 }
2725
2726 i = bond_get_targets_ip(bond->params.arp_targets, sip);
2727 if (i == -1) {
2728 slave_dbg(bond->dev, slave->dev, "%s: sip %pI4 not found in targets\n",
2729 __func__, &sip);
2730 return;
2731 }
2732 slave->last_rx = jiffies;
2733 slave->target_last_arp_rx[i] = jiffies;
2734 }
2735
2736 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2737 struct slave *slave)
2738 {
2739 struct arphdr *arp = (struct arphdr *)skb->data;
2740 struct slave *curr_active_slave, *curr_arp_slave;
2741 unsigned char *arp_ptr;
2742 __be32 sip, tip;
2743 int is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2744 unsigned int alen;
2745
2746 if (!slave_do_arp_validate(bond, slave)) {
2747 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2748 !slave_do_arp_validate_only(bond))
2749 slave->last_rx = jiffies;
2750 return RX_HANDLER_ANOTHER;
2751 } else if (!is_arp) {
2752 return RX_HANDLER_ANOTHER;
2753 }
2754
2755 alen = arp_hdr_len(bond->dev);
2756
2757 slave_dbg(bond->dev, slave->dev, "%s: skb->dev %s\n",
2758 __func__, skb->dev->name);
2759
2760 if (alen > skb_headlen(skb)) {
2761 arp = kmalloc(alen, GFP_ATOMIC);
2762 if (!arp)
2763 goto out_unlock;
2764 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2765 goto out_unlock;
2766 }
2767
2768 if (arp->ar_hln != bond->dev->addr_len ||
2769 skb->pkt_type == PACKET_OTHERHOST ||
2770 skb->pkt_type == PACKET_LOOPBACK ||
2771 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2772 arp->ar_pro != htons(ETH_P_IP) ||
2773 arp->ar_pln != 4)
2774 goto out_unlock;
2775
2776 arp_ptr = (unsigned char *)(arp + 1);
2777 arp_ptr += bond->dev->addr_len;
2778 memcpy(&sip, arp_ptr, 4);
2779 arp_ptr += 4 + bond->dev->addr_len;
2780 memcpy(&tip, arp_ptr, 4);
2781
2782 slave_dbg(bond->dev, slave->dev, "%s: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2783 __func__, slave->dev->name, bond_slave_state(slave),
2784 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2785 &sip, &tip);
2786
2787 curr_active_slave = rcu_dereference(bond->curr_active_slave);
2788 curr_arp_slave = rcu_dereference(bond->current_arp_slave);
2789
2790 /* We 'trust' the received ARP enough to validate it if:
2791 *
2792 * (a) the slave receiving the ARP is active (which includes the
2793 * current ARP slave, if any), or
2794 *
2795 * (b) the receiving slave isn't active, but there is a currently
2796 * active slave and it received valid arp reply(s) after it became
2797 * the currently active slave, or
2798 *
2799 * (c) there is an ARP slave that sent an ARP during the prior ARP
2800 * interval, and we receive an ARP reply on any slave. We accept
2801 * these because switch FDB update delays may deliver the ARP
2802 * reply to a slave other than the sender of the ARP request.
2803 *
2804 * Note: for (b), backup slaves are receiving the broadcast ARP
2805 * request, not a reply. This request passes from the sending
2806 * slave through the L2 switch(es) to the receiving slave. Since
2807 * this is checking the request, sip/tip are swapped for
2808 * validation.
2809 *
2810 * This is done to avoid endless looping when we can't reach the
2811 * arp_ip_target and fool ourselves with our own arp requests.
2812 */
2813 if (bond_is_active_slave(slave))
2814 bond_validate_arp(bond, slave, sip, tip);
2815 else if (curr_active_slave &&
2816 time_after(slave_last_rx(bond, curr_active_slave),
2817 curr_active_slave->last_link_up))
2818 bond_validate_arp(bond, slave, tip, sip);
2819 else if (curr_arp_slave && (arp->ar_op == htons(ARPOP_REPLY)) &&
2820 bond_time_in_interval(bond,
2821 dev_trans_start(curr_arp_slave->dev), 1))
2822 bond_validate_arp(bond, slave, sip, tip);
2823
2824 out_unlock:
2825 if (arp != (struct arphdr *)skb->data)
2826 kfree(arp);
2827 return RX_HANDLER_ANOTHER;
2828 }
2829
2830 /* function to verify if we're in the arp_interval timeslice, returns true if
2831 * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2832 * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2833 */
2834 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2835 int mod)
2836 {
2837 int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2838
2839 return time_in_range(jiffies,
2840 last_act - delta_in_ticks,
2841 last_act + mod * delta_in_ticks + delta_in_ticks/2);
2842 }
2843
2844 /* This function is called regularly to monitor each slave's link
2845 * ensuring that traffic is being sent and received when arp monitoring
2846 * is used in load-balancing mode. if the adapter has been dormant, then an
2847 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2848 * arp monitoring in active backup mode.
2849 */
2850 static void bond_loadbalance_arp_mon(struct bonding *bond)
2851 {
2852 struct slave *slave, *oldcurrent;
2853 struct list_head *iter;
2854 int do_failover = 0, slave_state_changed = 0;
2855
2856 if (!bond_has_slaves(bond))
2857 goto re_arm;
2858
2859 rcu_read_lock();
2860
2861 oldcurrent = rcu_dereference(bond->curr_active_slave);
2862 /* see if any of the previous devices are up now (i.e. they have
2863 * xmt and rcv traffic). the curr_active_slave does not come into
2864 * the picture unless it is null. also, slave->last_link_up is not
2865 * needed here because we send an arp on each slave and give a slave
2866 * as long as it needs to get the tx/rx within the delta.
2867 * TODO: what about up/down delay in arp mode? it wasn't here before
2868 * so it can wait
2869 */
2870 bond_for_each_slave_rcu(bond, slave, iter) {
2871 unsigned long trans_start = dev_trans_start(slave->dev);
2872
2873 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2874
2875 if (slave->link != BOND_LINK_UP) {
2876 if (bond_time_in_interval(bond, trans_start, 1) &&
2877 bond_time_in_interval(bond, slave->last_rx, 1)) {
2878
2879 bond_propose_link_state(slave, BOND_LINK_UP);
2880 slave_state_changed = 1;
2881
2882 /* primary_slave has no meaning in round-robin
2883 * mode. the window of a slave being up and
2884 * curr_active_slave being null after enslaving
2885 * is closed.
2886 */
2887 if (!oldcurrent) {
2888 slave_info(bond->dev, slave->dev, "link status definitely up\n");
2889 do_failover = 1;
2890 } else {
2891 slave_info(bond->dev, slave->dev, "interface is now up\n");
2892 }
2893 }
2894 } else {
2895 /* slave->link == BOND_LINK_UP */
2896
2897 /* not all switches will respond to an arp request
2898 * when the source ip is 0, so don't take the link down
2899 * if we don't know our ip yet
2900 */
2901 if (!bond_time_in_interval(bond, trans_start, 2) ||
2902 !bond_time_in_interval(bond, slave->last_rx, 2)) {
2903
2904 bond_propose_link_state(slave, BOND_LINK_DOWN);
2905 slave_state_changed = 1;
2906
2907 if (slave->link_failure_count < UINT_MAX)
2908 slave->link_failure_count++;
2909
2910 slave_info(bond->dev, slave->dev, "interface is now down\n");
2911
2912 if (slave == oldcurrent)
2913 do_failover = 1;
2914 }
2915 }
2916
2917 /* note: if switch is in round-robin mode, all links
2918 * must tx arp to ensure all links rx an arp - otherwise
2919 * links may oscillate or not come up at all; if switch is
2920 * in something like xor mode, there is nothing we can
2921 * do - all replies will be rx'ed on same link causing slaves
2922 * to be unstable during low/no traffic periods
2923 */
2924 if (bond_slave_is_up(slave))
2925 bond_arp_send_all(bond, slave);
2926 }
2927
2928 rcu_read_unlock();
2929
2930 if (do_failover || slave_state_changed) {
2931 if (!rtnl_trylock())
2932 goto re_arm;
2933
2934 bond_for_each_slave(bond, slave, iter) {
2935 if (slave->link_new_state != BOND_LINK_NOCHANGE)
2936 slave->link = slave->link_new_state;
2937 }
2938
2939 if (slave_state_changed) {
2940 bond_slave_state_change(bond);
2941 if (BOND_MODE(bond) == BOND_MODE_XOR)
2942 bond_update_slave_arr(bond, NULL);
2943 }
2944 if (do_failover) {
2945 block_netpoll_tx();
2946 bond_select_active_slave(bond);
2947 unblock_netpoll_tx();
2948 }
2949 rtnl_unlock();
2950 }
2951
2952 re_arm:
2953 if (bond->params.arp_interval)
2954 queue_delayed_work(bond->wq, &bond->arp_work,
2955 msecs_to_jiffies(bond->params.arp_interval));
2956 }
2957
2958 /* Called to inspect slaves for active-backup mode ARP monitor link state
2959 * changes. Sets proposed link state in slaves to specify what action
2960 * should take place for the slave. Returns 0 if no changes are found, >0
2961 * if changes to link states must be committed.
2962 *
2963 * Called with rcu_read_lock held.
2964 */
2965 static int bond_ab_arp_inspect(struct bonding *bond)
2966 {
2967 unsigned long trans_start, last_rx;
2968 struct list_head *iter;
2969 struct slave *slave;
2970 int commit = 0;
2971
2972 bond_for_each_slave_rcu(bond, slave, iter) {
2973 bond_propose_link_state(slave, BOND_LINK_NOCHANGE);
2974 last_rx = slave_last_rx(bond, slave);
2975
2976 if (slave->link != BOND_LINK_UP) {
2977 if (bond_time_in_interval(bond, last_rx, 1)) {
2978 bond_propose_link_state(slave, BOND_LINK_UP);
2979 commit++;
2980 } else if (slave->link == BOND_LINK_BACK) {
2981 bond_propose_link_state(slave, BOND_LINK_FAIL);
2982 commit++;
2983 }
2984 continue;
2985 }
2986
2987 /* Give slaves 2*delta after being enslaved or made
2988 * active. This avoids bouncing, as the last receive
2989 * times need a full ARP monitor cycle to be updated.
2990 */
2991 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2992 continue;
2993
2994 /* Backup slave is down if:
2995 * - No current_arp_slave AND
2996 * - more than 3*delta since last receive AND
2997 * - the bond has an IP address
2998 *
2999 * Note: a non-null current_arp_slave indicates
3000 * the curr_active_slave went down and we are
3001 * searching for a new one; under this condition
3002 * we only take the curr_active_slave down - this
3003 * gives each slave a chance to tx/rx traffic
3004 * before being taken out
3005 */
3006 if (!bond_is_active_slave(slave) &&
3007 !rcu_access_pointer(bond->current_arp_slave) &&
3008 !bond_time_in_interval(bond, last_rx, 3)) {
3009 bond_propose_link_state(slave, BOND_LINK_DOWN);
3010 commit++;
3011 }
3012
3013 /* Active slave is down if:
3014 * - more than 2*delta since transmitting OR
3015 * - (more than 2*delta since receive AND
3016 * the bond has an IP address)
3017 */
3018 trans_start = dev_trans_start(slave->dev);
3019 if (bond_is_active_slave(slave) &&
3020 (!bond_time_in_interval(bond, trans_start, 2) ||
3021 !bond_time_in_interval(bond, last_rx, 2))) {
3022 bond_propose_link_state(slave, BOND_LINK_DOWN);
3023 commit++;
3024 }
3025 }
3026
3027 return commit;
3028 }
3029
3030 /* Called to commit link state changes noted by inspection step of
3031 * active-backup mode ARP monitor.
3032 *
3033 * Called with RTNL hold.
3034 */
3035 static void bond_ab_arp_commit(struct bonding *bond)
3036 {
3037 unsigned long trans_start;
3038 struct list_head *iter;
3039 struct slave *slave;
3040
3041 bond_for_each_slave(bond, slave, iter) {
3042 switch (slave->link_new_state) {
3043 case BOND_LINK_NOCHANGE:
3044 continue;
3045
3046 case BOND_LINK_UP:
3047 trans_start = dev_trans_start(slave->dev);
3048 if (rtnl_dereference(bond->curr_active_slave) != slave ||
3049 (!rtnl_dereference(bond->curr_active_slave) &&
3050 bond_time_in_interval(bond, trans_start, 1))) {
3051 struct slave *current_arp_slave;
3052
3053 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
3054 bond_set_slave_link_state(slave, BOND_LINK_UP,
3055 BOND_SLAVE_NOTIFY_NOW);
3056 if (current_arp_slave) {
3057 bond_set_slave_inactive_flags(
3058 current_arp_slave,
3059 BOND_SLAVE_NOTIFY_NOW);
3060 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3061 }
3062
3063 slave_info(bond->dev, slave->dev, "link status definitely up\n");
3064
3065 if (!rtnl_dereference(bond->curr_active_slave) ||
3066 slave == rtnl_dereference(bond->primary_slave))
3067 goto do_failover;
3068
3069 }
3070
3071 continue;
3072
3073 case BOND_LINK_DOWN:
3074 if (slave->link_failure_count < UINT_MAX)
3075 slave->link_failure_count++;
3076
3077 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3078 BOND_SLAVE_NOTIFY_NOW);
3079 bond_set_slave_inactive_flags(slave,
3080 BOND_SLAVE_NOTIFY_NOW);
3081
3082 slave_info(bond->dev, slave->dev, "link status definitely down, disabling slave\n");
3083
3084 if (slave == rtnl_dereference(bond->curr_active_slave)) {
3085 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3086 goto do_failover;
3087 }
3088
3089 continue;
3090
3091 case BOND_LINK_FAIL:
3092 bond_set_slave_link_state(slave, BOND_LINK_FAIL,
3093 BOND_SLAVE_NOTIFY_NOW);
3094 bond_set_slave_inactive_flags(slave,
3095 BOND_SLAVE_NOTIFY_NOW);
3096
3097 /* A slave has just been enslaved and has become
3098 * the current active slave.
3099 */
3100 if (rtnl_dereference(bond->curr_active_slave))
3101 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
3102 continue;
3103
3104 default:
3105 slave_err(bond->dev, slave->dev,
3106 "impossible: link_new_state %d on slave\n",
3107 slave->link_new_state);
3108 continue;
3109 }
3110
3111 do_failover:
3112 block_netpoll_tx();
3113 bond_select_active_slave(bond);
3114 unblock_netpoll_tx();
3115 }
3116
3117 bond_set_carrier(bond);
3118 }
3119
3120 /* Send ARP probes for active-backup mode ARP monitor.
3121 *
3122 * Called with rcu_read_lock held.
3123 */
3124 static bool bond_ab_arp_probe(struct bonding *bond)
3125 {
3126 struct slave *slave, *before = NULL, *new_slave = NULL,
3127 *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
3128 *curr_active_slave = rcu_dereference(bond->curr_active_slave);
3129 struct list_head *iter;
3130 bool found = false;
3131 bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
3132
3133 if (curr_arp_slave && curr_active_slave)
3134 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
3135 curr_arp_slave->dev->name,
3136 curr_active_slave->dev->name);
3137
3138 if (curr_active_slave) {
3139 bond_arp_send_all(bond, curr_active_slave);
3140 return should_notify_rtnl;
3141 }
3142
3143 /* if we don't have a curr_active_slave, search for the next available
3144 * backup slave from the current_arp_slave and make it the candidate
3145 * for becoming the curr_active_slave
3146 */
3147
3148 if (!curr_arp_slave) {
3149 curr_arp_slave = bond_first_slave_rcu(bond);
3150 if (!curr_arp_slave)
3151 return should_notify_rtnl;
3152 }
3153
3154 bond_for_each_slave_rcu(bond, slave, iter) {
3155 if (!found && !before && bond_slave_is_up(slave))
3156 before = slave;
3157
3158 if (found && !new_slave && bond_slave_is_up(slave))
3159 new_slave = slave;
3160 /* if the link state is up at this point, we
3161 * mark it down - this can happen if we have
3162 * simultaneous link failures and
3163 * reselect_active_interface doesn't make this
3164 * one the current slave so it is still marked
3165 * up when it is actually down
3166 */
3167 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3168 bond_set_slave_link_state(slave, BOND_LINK_DOWN,
3169 BOND_SLAVE_NOTIFY_LATER);
3170 if (slave->link_failure_count < UINT_MAX)
3171 slave->link_failure_count++;
3172
3173 bond_set_slave_inactive_flags(slave,
3174 BOND_SLAVE_NOTIFY_LATER);
3175
3176 slave_info(bond->dev, slave->dev, "backup interface is now down\n");
3177 }
3178 if (slave == curr_arp_slave)
3179 found = true;
3180 }
3181
3182 if (!new_slave && before)
3183 new_slave = before;
3184
3185 if (!new_slave)
3186 goto check_state;
3187
3188 bond_set_slave_link_state(new_slave, BOND_LINK_BACK,
3189 BOND_SLAVE_NOTIFY_LATER);
3190 bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
3191 bond_arp_send_all(bond, new_slave);
3192 new_slave->last_link_up = jiffies;
3193 rcu_assign_pointer(bond->current_arp_slave, new_slave);
3194
3195 check_state:
3196 bond_for_each_slave_rcu(bond, slave, iter) {
3197 if (slave->should_notify || slave->should_notify_link) {
3198 should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
3199 break;
3200 }
3201 }
3202 return should_notify_rtnl;
3203 }
3204
3205 static void bond_activebackup_arp_mon(struct bonding *bond)
3206 {
3207 bool should_notify_peers = false;
3208 bool should_notify_rtnl = false;
3209 int delta_in_ticks;
3210
3211 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3212
3213 if (!bond_has_slaves(bond))
3214 goto re_arm;
3215
3216 rcu_read_lock();
3217
3218 should_notify_peers = bond_should_notify_peers(bond);
3219
3220 if (bond_ab_arp_inspect(bond)) {
3221 rcu_read_unlock();
3222
3223 /* Race avoidance with bond_close flush of workqueue */
3224 if (!rtnl_trylock()) {
3225 delta_in_ticks = 1;
3226 should_notify_peers = false;
3227 goto re_arm;
3228 }
3229
3230 bond_ab_arp_commit(bond);
3231
3232 rtnl_unlock();
3233 rcu_read_lock();
3234 }
3235
3236 should_notify_rtnl = bond_ab_arp_probe(bond);
3237 rcu_read_unlock();
3238
3239 re_arm:
3240 if (bond->params.arp_interval)
3241 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3242
3243 if (should_notify_peers || should_notify_rtnl) {
3244 if (!rtnl_trylock())
3245 return;
3246
3247 if (should_notify_peers)
3248 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
3249 bond->dev);
3250 if (should_notify_rtnl) {
3251 bond_slave_state_notify(bond);
3252 bond_slave_link_notify(bond);
3253 }
3254
3255 rtnl_unlock();
3256 }
3257 }
3258
3259 static void bond_arp_monitor(struct work_struct *work)
3260 {
3261 struct bonding *bond = container_of(work, struct bonding,
3262 arp_work.work);
3263
3264 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3265 bond_activebackup_arp_mon(bond);
3266 else
3267 bond_loadbalance_arp_mon(bond);
3268 }
3269
3270 /*-------------------------- netdev event handling --------------------------*/
3271
3272 /* Change device name */
3273 static int bond_event_changename(struct bonding *bond)
3274 {
3275 bond_remove_proc_entry(bond);
3276 bond_create_proc_entry(bond);
3277
3278 bond_debug_reregister(bond);
3279
3280 return NOTIFY_DONE;
3281 }
3282
3283 static int bond_master_netdev_event(unsigned long event,
3284 struct net_device *bond_dev)
3285 {
3286 struct bonding *event_bond = netdev_priv(bond_dev);
3287
3288 netdev_dbg(bond_dev, "%s called\n", __func__);
3289
3290 switch (event) {
3291 case NETDEV_CHANGENAME:
3292 return bond_event_changename(event_bond);
3293 case NETDEV_UNREGISTER:
3294 bond_remove_proc_entry(event_bond);
3295 break;
3296 case NETDEV_REGISTER:
3297 bond_create_proc_entry(event_bond);
3298 break;
3299 default:
3300 break;
3301 }
3302
3303 return NOTIFY_DONE;
3304 }
3305
3306 static int bond_slave_netdev_event(unsigned long event,
3307 struct net_device *slave_dev)
3308 {
3309 struct slave *slave = bond_slave_get_rtnl(slave_dev), *primary;
3310 struct bonding *bond;
3311 struct net_device *bond_dev;
3312
3313 /* A netdev event can be generated while enslaving a device
3314 * before netdev_rx_handler_register is called in which case
3315 * slave will be NULL
3316 */
3317 if (!slave) {
3318 netdev_dbg(slave_dev, "%s called on NULL slave\n", __func__);
3319 return NOTIFY_DONE;
3320 }
3321
3322 bond_dev = slave->bond->dev;
3323 bond = slave->bond;
3324 primary = rtnl_dereference(bond->primary_slave);
3325
3326 slave_dbg(bond_dev, slave_dev, "%s called\n", __func__);
3327
3328 switch (event) {
3329 case NETDEV_UNREGISTER:
3330 if (bond_dev->type != ARPHRD_ETHER)
3331 bond_release_and_destroy(bond_dev, slave_dev);
3332 else
3333 __bond_release_one(bond_dev, slave_dev, false, true);
3334 break;
3335 case NETDEV_UP:
3336 case NETDEV_CHANGE:
3337 /* For 802.3ad mode only:
3338 * Getting invalid Speed/Duplex values here will put slave
3339 * in weird state. Mark it as link-fail if the link was
3340 * previously up or link-down if it hasn't yet come up, and
3341 * let link-monitoring (miimon) set it right when correct
3342 * speeds/duplex are available.
3343 */
3344 if (bond_update_speed_duplex(slave) &&
3345 BOND_MODE(bond) == BOND_MODE_8023AD) {
3346 if (slave->last_link_up)
3347 slave->link = BOND_LINK_FAIL;
3348 else
3349 slave->link = BOND_LINK_DOWN;
3350 }
3351
3352 if (BOND_MODE(bond) == BOND_MODE_8023AD)
3353 bond_3ad_adapter_speed_duplex_changed(slave);
3354 fallthrough;
3355 case NETDEV_DOWN:
3356 /* Refresh slave-array if applicable!
3357 * If the setup does not use miimon or arpmon (mode-specific!),
3358 * then these events will not cause the slave-array to be
3359 * refreshed. This will cause xmit to use a slave that is not
3360 * usable. Avoid such situation by refeshing the array at these
3361 * events. If these (miimon/arpmon) parameters are configured
3362 * then array gets refreshed twice and that should be fine!
3363 */
3364 if (bond_mode_can_use_xmit_hash(bond))
3365 bond_update_slave_arr(bond, NULL);
3366 break;
3367 case NETDEV_CHANGEMTU:
3368 /* TODO: Should slaves be allowed to
3369 * independently alter their MTU? For
3370 * an active-backup bond, slaves need
3371 * not be the same type of device, so
3372 * MTUs may vary. For other modes,
3373 * slaves arguably should have the
3374 * same MTUs. To do this, we'd need to
3375 * take over the slave's change_mtu
3376 * function for the duration of their
3377 * servitude.
3378 */
3379 break;
3380 case NETDEV_CHANGENAME:
3381 /* we don't care if we don't have primary set */
3382 if (!bond_uses_primary(bond) ||
3383 !bond->params.primary[0])
3384 break;
3385
3386 if (slave == primary) {
3387 /* slave's name changed - he's no longer primary */
3388 RCU_INIT_POINTER(bond->primary_slave, NULL);
3389 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
3390 /* we have a new primary slave */
3391 rcu_assign_pointer(bond->primary_slave, slave);
3392 } else { /* we didn't change primary - exit */
3393 break;
3394 }
3395
3396 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
3397 primary ? slave_dev->name : "none");
3398
3399 block_netpoll_tx();
3400 bond_select_active_slave(bond);
3401 unblock_netpoll_tx();
3402 break;
3403 case NETDEV_FEAT_CHANGE:
3404 bond_compute_features(bond);
3405 break;
3406 case NETDEV_RESEND_IGMP:
3407 /* Propagate to master device */
3408 call_netdevice_notifiers(event, slave->bond->dev);
3409 break;
3410 default:
3411 break;
3412 }
3413
3414 return NOTIFY_DONE;
3415 }
3416
3417 /* bond_netdev_event: handle netdev notifier chain events.
3418 *
3419 * This function receives events for the netdev chain. The caller (an
3420 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3421 * locks for us to safely manipulate the slave devices (RTNL lock,
3422 * dev_probe_lock).
3423 */
3424 static int bond_netdev_event(struct notifier_block *this,
3425 unsigned long event, void *ptr)
3426 {
3427 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
3428
3429 netdev_dbg(event_dev, "%s received %s\n",
3430 __func__, netdev_cmd_to_name(event));
3431
3432 if (!(event_dev->priv_flags & IFF_BONDING))
3433 return NOTIFY_DONE;
3434
3435 if (event_dev->flags & IFF_MASTER) {
3436 int ret;
3437
3438 ret = bond_master_netdev_event(event, event_dev);
3439 if (ret != NOTIFY_DONE)
3440 return ret;
3441 }
3442
3443 if (event_dev->flags & IFF_SLAVE)
3444 return bond_slave_netdev_event(event, event_dev);
3445
3446 return NOTIFY_DONE;
3447 }
3448
3449 static struct notifier_block bond_netdev_notifier = {
3450 .notifier_call = bond_netdev_event,
3451 };
3452
3453 /*---------------------------- Hashing Policies -----------------------------*/
3454
3455 /* L2 hash helper */
3456 static inline u32 bond_eth_hash(struct sk_buff *skb)
3457 {
3458 struct ethhdr *ep, hdr_tmp;
3459
3460 ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
3461 if (ep)
3462 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3463 return 0;
3464 }
3465
3466 static bool bond_flow_ip(struct sk_buff *skb, struct flow_keys *fk,
3467 int *noff, int *proto, bool l34)
3468 {
3469 const struct ipv6hdr *iph6;
3470 const struct iphdr *iph;
3471
3472 if (skb->protocol == htons(ETH_P_IP)) {
3473 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph))))
3474 return false;
3475 iph = (const struct iphdr *)(skb->data + *noff);
3476 iph_to_flow_copy_v4addrs(fk, iph);
3477 *noff += iph->ihl << 2;
3478 if (!ip_is_fragment(iph))
3479 *proto = iph->protocol;
3480 } else if (skb->protocol == htons(ETH_P_IPV6)) {
3481 if (unlikely(!pskb_may_pull(skb, *noff + sizeof(*iph6))))
3482 return false;
3483 iph6 = (const struct ipv6hdr *)(skb->data + *noff);
3484 iph_to_flow_copy_v6addrs(fk, iph6);
3485 *noff += sizeof(*iph6);
3486 *proto = iph6->nexthdr;
3487 } else {
3488 return false;
3489 }
3490
3491 if (l34 && *proto >= 0)
3492 fk->ports.ports = skb_flow_get_ports(skb, *noff, *proto);
3493
3494 return true;
3495 }
3496
3497 /* Extract the appropriate headers based on bond's xmit policy */
3498 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3499 struct flow_keys *fk)
3500 {
3501 bool l34 = bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34;
3502 int noff, proto = -1;
3503
3504 if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23) {
3505 memset(fk, 0, sizeof(*fk));
3506 return __skb_flow_dissect(NULL, skb, &flow_keys_bonding,
3507 fk, NULL, 0, 0, 0, 0);
3508 }
3509
3510 fk->ports.ports = 0;
3511 memset(&fk->icmp, 0, sizeof(fk->icmp));
3512 noff = skb_network_offset(skb);
3513 if (!bond_flow_ip(skb, fk, &noff, &proto, l34))
3514 return false;
3515
3516 /* ICMP error packets contains at least 8 bytes of the header
3517 * of the packet which generated the error. Use this information
3518 * to correlate ICMP error packets within the same flow which
3519 * generated the error.
3520 */
3521 if (proto == IPPROTO_ICMP || proto == IPPROTO_ICMPV6) {
3522 skb_flow_get_icmp_tci(skb, &fk->icmp, skb->data,
3523 skb_transport_offset(skb),
3524 skb_headlen(skb));
3525 if (proto == IPPROTO_ICMP) {
3526 if (!icmp_is_err(fk->icmp.type))
3527 return true;
3528
3529 noff += sizeof(struct icmphdr);
3530 } else if (proto == IPPROTO_ICMPV6) {
3531 if (!icmpv6_is_err(fk->icmp.type))
3532 return true;
3533
3534 noff += sizeof(struct icmp6hdr);
3535 }
3536 return bond_flow_ip(skb, fk, &noff, &proto, l34);
3537 }
3538
3539 return true;
3540 }
3541
3542 /**
3543 * bond_xmit_hash - generate a hash value based on the xmit policy
3544 * @bond: bonding device
3545 * @skb: buffer to use for headers
3546 *
3547 * This function will extract the necessary headers from the skb buffer and use
3548 * them to generate a hash based on the xmit_policy set in the bonding device
3549 */
3550 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3551 {
3552 struct flow_keys flow;
3553 u32 hash;
3554
3555 if (bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP34 &&
3556 skb->l4_hash)
3557 return skb->hash;
3558
3559 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3560 !bond_flow_dissect(bond, skb, &flow))
3561 return bond_eth_hash(skb);
3562
3563 if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3564 bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23) {
3565 hash = bond_eth_hash(skb);
3566 } else {
3567 if (flow.icmp.id)
3568 memcpy(&hash, &flow.icmp, sizeof(hash));
3569 else
3570 memcpy(&hash, &flow.ports.ports, sizeof(hash));
3571 }
3572 hash ^= (__force u32)flow_get_u32_dst(&flow) ^
3573 (__force u32)flow_get_u32_src(&flow);
3574 hash ^= (hash >> 16);
3575 hash ^= (hash >> 8);
3576
3577 return hash >> 1;
3578 }
3579
3580 /*-------------------------- Device entry points ----------------------------*/
3581
3582 void bond_work_init_all(struct bonding *bond)
3583 {
3584 INIT_DELAYED_WORK(&bond->mcast_work,
3585 bond_resend_igmp_join_requests_delayed);
3586 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3587 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3588 INIT_DELAYED_WORK(&bond->arp_work, bond_arp_monitor);
3589 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3590 INIT_DELAYED_WORK(&bond->slave_arr_work, bond_slave_arr_handler);
3591 }
3592
3593 static void bond_work_cancel_all(struct bonding *bond)
3594 {
3595 cancel_delayed_work_sync(&bond->mii_work);
3596 cancel_delayed_work_sync(&bond->arp_work);
3597 cancel_delayed_work_sync(&bond->alb_work);
3598 cancel_delayed_work_sync(&bond->ad_work);
3599 cancel_delayed_work_sync(&bond->mcast_work);
3600 cancel_delayed_work_sync(&bond->slave_arr_work);
3601 }
3602
3603 static int bond_open(struct net_device *bond_dev)
3604 {
3605 struct bonding *bond = netdev_priv(bond_dev);
3606 struct list_head *iter;
3607 struct slave *slave;
3608
3609 /* reset slave->backup and slave->inactive */
3610 if (bond_has_slaves(bond)) {
3611 bond_for_each_slave(bond, slave, iter) {
3612 if (bond_uses_primary(bond) &&
3613 slave != rcu_access_pointer(bond->curr_active_slave)) {
3614 bond_set_slave_inactive_flags(slave,
3615 BOND_SLAVE_NOTIFY_NOW);
3616 } else if (BOND_MODE(bond) != BOND_MODE_8023AD) {
3617 bond_set_slave_active_flags(slave,
3618 BOND_SLAVE_NOTIFY_NOW);
3619 }
3620 }
3621 }
3622
3623 if (bond_is_lb(bond)) {
3624 /* bond_alb_initialize must be called before the timer
3625 * is started.
3626 */
3627 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3628 return -ENOMEM;
3629 if (bond->params.tlb_dynamic_lb || BOND_MODE(bond) == BOND_MODE_ALB)
3630 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3631 }
3632
3633 if (bond->params.miimon) /* link check interval, in milliseconds. */
3634 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3635
3636 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3637 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3638 bond->recv_probe = bond_arp_rcv;
3639 }
3640
3641 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3642 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3643 /* register to receive LACPDUs */
3644 bond->recv_probe = bond_3ad_lacpdu_recv;
3645 bond_3ad_initiate_agg_selection(bond, 1);
3646 }
3647
3648 if (bond_mode_can_use_xmit_hash(bond))
3649 bond_update_slave_arr(bond, NULL);
3650
3651 return 0;
3652 }
3653
3654 static int bond_close(struct net_device *bond_dev)
3655 {
3656 struct bonding *bond = netdev_priv(bond_dev);
3657
3658 bond_work_cancel_all(bond);
3659 bond->send_peer_notif = 0;
3660 if (bond_is_lb(bond))
3661 bond_alb_deinitialize(bond);
3662 bond->recv_probe = NULL;
3663
3664 return 0;
3665 }
3666
3667 /* fold stats, assuming all rtnl_link_stats64 fields are u64, but
3668 * that some drivers can provide 32bit values only.
3669 */
3670 static void bond_fold_stats(struct rtnl_link_stats64 *_res,
3671 const struct rtnl_link_stats64 *_new,
3672 const struct rtnl_link_stats64 *_old)
3673 {
3674 const u64 *new = (const u64 *)_new;
3675 const u64 *old = (const u64 *)_old;
3676 u64 *res = (u64 *)_res;
3677 int i;
3678
3679 for (i = 0; i < sizeof(*_res) / sizeof(u64); i++) {
3680 u64 nv = new[i];
3681 u64 ov = old[i];
3682 s64 delta = nv - ov;
3683
3684 /* detects if this particular field is 32bit only */
3685 if (((nv | ov) >> 32) == 0)
3686 delta = (s64)(s32)((u32)nv - (u32)ov);
3687
3688 /* filter anomalies, some drivers reset their stats
3689 * at down/up events.
3690 */
3691 if (delta > 0)
3692 res[i] += delta;
3693 }
3694 }
3695
3696 #ifdef CONFIG_LOCKDEP
3697 static int bond_get_lowest_level_rcu(struct net_device *dev)
3698 {
3699 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
3700 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
3701 int cur = 0, max = 0;
3702
3703 now = dev;
3704 iter = &dev->adj_list.lower;
3705
3706 while (1) {
3707 next = NULL;
3708 while (1) {
3709 ldev = netdev_next_lower_dev_rcu(now, &iter);
3710 if (!ldev)
3711 break;
3712
3713 next = ldev;
3714 niter = &ldev->adj_list.lower;
3715 dev_stack[cur] = now;
3716 iter_stack[cur++] = iter;
3717 if (max <= cur)
3718 max = cur;
3719 break;
3720 }
3721
3722 if (!next) {
3723 if (!cur)
3724 return max;
3725 next = dev_stack[--cur];
3726 niter = iter_stack[cur];
3727 }
3728
3729 now = next;
3730 iter = niter;
3731 }
3732
3733 return max;
3734 }
3735 #endif
3736
3737 static void bond_get_stats(struct net_device *bond_dev,
3738 struct rtnl_link_stats64 *stats)
3739 {
3740 struct bonding *bond = netdev_priv(bond_dev);
3741 struct rtnl_link_stats64 temp;
3742 struct list_head *iter;
3743 struct slave *slave;
3744 int nest_level = 0;
3745
3746
3747 rcu_read_lock();
3748 #ifdef CONFIG_LOCKDEP
3749 nest_level = bond_get_lowest_level_rcu(bond_dev);
3750 #endif
3751
3752 spin_lock_nested(&bond->stats_lock, nest_level);
3753 memcpy(stats, &bond->bond_stats, sizeof(*stats));
3754
3755 bond_for_each_slave_rcu(bond, slave, iter) {
3756 const struct rtnl_link_stats64 *new =
3757 dev_get_stats(slave->dev, &temp);
3758
3759 bond_fold_stats(stats, new, &slave->slave_stats);
3760
3761 /* save off the slave stats for the next run */
3762 memcpy(&slave->slave_stats, new, sizeof(*new));
3763 }
3764
3765 memcpy(&bond->bond_stats, stats, sizeof(*stats));
3766 spin_unlock(&bond->stats_lock);
3767 rcu_read_unlock();
3768 }
3769
3770 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3771 {
3772 struct bonding *bond = netdev_priv(bond_dev);
3773 struct net_device *slave_dev = NULL;
3774 struct ifbond k_binfo;
3775 struct ifbond __user *u_binfo = NULL;
3776 struct ifslave k_sinfo;
3777 struct ifslave __user *u_sinfo = NULL;
3778 struct mii_ioctl_data *mii = NULL;
3779 struct bond_opt_value newval;
3780 struct net *net;
3781 int res = 0;
3782
3783 netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3784
3785 switch (cmd) {
3786 case SIOCGMIIPHY:
3787 mii = if_mii(ifr);
3788 if (!mii)
3789 return -EINVAL;
3790
3791 mii->phy_id = 0;
3792 fallthrough;
3793 case SIOCGMIIREG:
3794 /* We do this again just in case we were called by SIOCGMIIREG
3795 * instead of SIOCGMIIPHY.
3796 */
3797 mii = if_mii(ifr);
3798 if (!mii)
3799 return -EINVAL;
3800
3801 if (mii->reg_num == 1) {
3802 mii->val_out = 0;
3803 if (netif_carrier_ok(bond->dev))
3804 mii->val_out = BMSR_LSTATUS;
3805 }
3806
3807 return 0;
3808 case BOND_INFO_QUERY_OLD:
3809 case SIOCBONDINFOQUERY:
3810 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3811
3812 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3813 return -EFAULT;
3814
3815 bond_info_query(bond_dev, &k_binfo);
3816 if (copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3817 return -EFAULT;
3818
3819 return 0;
3820 case BOND_SLAVE_INFO_QUERY_OLD:
3821 case SIOCBONDSLAVEINFOQUERY:
3822 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3823
3824 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3825 return -EFAULT;
3826
3827 res = bond_slave_info_query(bond_dev, &k_sinfo);
3828 if (res == 0 &&
3829 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3830 return -EFAULT;
3831
3832 return res;
3833 default:
3834 break;
3835 }
3836
3837 net = dev_net(bond_dev);
3838
3839 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3840 return -EPERM;
3841
3842 slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3843
3844 slave_dbg(bond_dev, slave_dev, "slave_dev=%p:\n", slave_dev);
3845
3846 if (!slave_dev)
3847 return -ENODEV;
3848
3849 switch (cmd) {
3850 case BOND_ENSLAVE_OLD:
3851 case SIOCBONDENSLAVE:
3852 res = bond_enslave(bond_dev, slave_dev, NULL);
3853 break;
3854 case BOND_RELEASE_OLD:
3855 case SIOCBONDRELEASE:
3856 res = bond_release(bond_dev, slave_dev);
3857 break;
3858 case BOND_SETHWADDR_OLD:
3859 case SIOCBONDSETHWADDR:
3860 res = bond_set_dev_addr(bond_dev, slave_dev);
3861 break;
3862 case BOND_CHANGE_ACTIVE_OLD:
3863 case SIOCBONDCHANGEACTIVE:
3864 bond_opt_initstr(&newval, slave_dev->name);
3865 res = __bond_opt_set_notify(bond, BOND_OPT_ACTIVE_SLAVE,
3866 &newval);
3867 break;
3868 default:
3869 res = -EOPNOTSUPP;
3870 }
3871
3872 return res;
3873 }
3874
3875 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3876 {
3877 struct bonding *bond = netdev_priv(bond_dev);
3878
3879 if (change & IFF_PROMISC)
3880 bond_set_promiscuity(bond,
3881 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3882
3883 if (change & IFF_ALLMULTI)
3884 bond_set_allmulti(bond,
3885 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3886 }
3887
3888 static void bond_set_rx_mode(struct net_device *bond_dev)
3889 {
3890 struct bonding *bond = netdev_priv(bond_dev);
3891 struct list_head *iter;
3892 struct slave *slave;
3893
3894 rcu_read_lock();
3895 if (bond_uses_primary(bond)) {
3896 slave = rcu_dereference(bond->curr_active_slave);
3897 if (slave) {
3898 dev_uc_sync(slave->dev, bond_dev);
3899 dev_mc_sync(slave->dev, bond_dev);
3900 }
3901 } else {
3902 bond_for_each_slave_rcu(bond, slave, iter) {
3903 dev_uc_sync_multiple(slave->dev, bond_dev);
3904 dev_mc_sync_multiple(slave->dev, bond_dev);
3905 }
3906 }
3907 rcu_read_unlock();
3908 }
3909
3910 static int bond_neigh_init(struct neighbour *n)
3911 {
3912 struct bonding *bond = netdev_priv(n->dev);
3913 const struct net_device_ops *slave_ops;
3914 struct neigh_parms parms;
3915 struct slave *slave;
3916 int ret = 0;
3917
3918 rcu_read_lock();
3919 slave = bond_first_slave_rcu(bond);
3920 if (!slave)
3921 goto out;
3922 slave_ops = slave->dev->netdev_ops;
3923 if (!slave_ops->ndo_neigh_setup)
3924 goto out;
3925
3926 /* TODO: find another way [1] to implement this.
3927 * Passing a zeroed structure is fragile,
3928 * but at least we do not pass garbage.
3929 *
3930 * [1] One way would be that ndo_neigh_setup() never touch
3931 * struct neigh_parms, but propagate the new neigh_setup()
3932 * back to ___neigh_create() / neigh_parms_alloc()
3933 */
3934 memset(&parms, 0, sizeof(parms));
3935 ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3936
3937 if (ret)
3938 goto out;
3939
3940 if (parms.neigh_setup)
3941 ret = parms.neigh_setup(n);
3942 out:
3943 rcu_read_unlock();
3944 return ret;
3945 }
3946
3947 /* The bonding ndo_neigh_setup is called at init time beofre any
3948 * slave exists. So we must declare proxy setup function which will
3949 * be used at run time to resolve the actual slave neigh param setup.
3950 *
3951 * It's also called by master devices (such as vlans) to setup their
3952 * underlying devices. In that case - do nothing, we're already set up from
3953 * our init.
3954 */
3955 static int bond_neigh_setup(struct net_device *dev,
3956 struct neigh_parms *parms)
3957 {
3958 /* modify only our neigh_parms */
3959 if (parms->dev == dev)
3960 parms->neigh_setup = bond_neigh_init;
3961
3962 return 0;
3963 }
3964
3965 /* Change the MTU of all of a master's slaves to match the master */
3966 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3967 {
3968 struct bonding *bond = netdev_priv(bond_dev);
3969 struct slave *slave, *rollback_slave;
3970 struct list_head *iter;
3971 int res = 0;
3972
3973 netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3974
3975 bond_for_each_slave(bond, slave, iter) {
3976 slave_dbg(bond_dev, slave->dev, "s %p c_m %p\n",
3977 slave, slave->dev->netdev_ops->ndo_change_mtu);
3978
3979 res = dev_set_mtu(slave->dev, new_mtu);
3980
3981 if (res) {
3982 /* If we failed to set the slave's mtu to the new value
3983 * we must abort the operation even in ACTIVE_BACKUP
3984 * mode, because if we allow the backup slaves to have
3985 * different mtu values than the active slave we'll
3986 * need to change their mtu when doing a failover. That
3987 * means changing their mtu from timer context, which
3988 * is probably not a good idea.
3989 */
3990 slave_dbg(bond_dev, slave->dev, "err %d setting mtu to %d\n",
3991 res, new_mtu);
3992 goto unwind;
3993 }
3994 }
3995
3996 bond_dev->mtu = new_mtu;
3997
3998 return 0;
3999
4000 unwind:
4001 /* unwind from head to the slave that failed */
4002 bond_for_each_slave(bond, rollback_slave, iter) {
4003 int tmp_res;
4004
4005 if (rollback_slave == slave)
4006 break;
4007
4008 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
4009 if (tmp_res)
4010 slave_dbg(bond_dev, rollback_slave->dev, "unwind err %d\n",
4011 tmp_res);
4012 }
4013
4014 return res;
4015 }
4016
4017 /* Change HW address
4018 *
4019 * Note that many devices must be down to change the HW address, and
4020 * downing the master releases all slaves. We can make bonds full of
4021 * bonding devices to test this, however.
4022 */
4023 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
4024 {
4025 struct bonding *bond = netdev_priv(bond_dev);
4026 struct slave *slave, *rollback_slave;
4027 struct sockaddr_storage *ss = addr, tmp_ss;
4028 struct list_head *iter;
4029 int res = 0;
4030
4031 if (BOND_MODE(bond) == BOND_MODE_ALB)
4032 return bond_alb_set_mac_address(bond_dev, addr);
4033
4034
4035 netdev_dbg(bond_dev, "%s: bond=%p\n", __func__, bond);
4036
4037 /* If fail_over_mac is enabled, do nothing and return success.
4038 * Returning an error causes ifenslave to fail.
4039 */
4040 if (bond->params.fail_over_mac &&
4041 BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4042 return 0;
4043
4044 if (!is_valid_ether_addr(ss->__data))
4045 return -EADDRNOTAVAIL;
4046
4047 bond_for_each_slave(bond, slave, iter) {
4048 slave_dbg(bond_dev, slave->dev, "%s: slave=%p\n",
4049 __func__, slave);
4050 res = dev_set_mac_address(slave->dev, addr, NULL);
4051 if (res) {
4052 /* TODO: consider downing the slave
4053 * and retry ?
4054 * User should expect communications
4055 * breakage anyway until ARP finish
4056 * updating, so...
4057 */
4058 slave_dbg(bond_dev, slave->dev, "%s: err %d\n",
4059 __func__, res);
4060 goto unwind;
4061 }
4062 }
4063
4064 /* success */
4065 memcpy(bond_dev->dev_addr, ss->__data, bond_dev->addr_len);
4066 return 0;
4067
4068 unwind:
4069 memcpy(tmp_ss.__data, bond_dev->dev_addr, bond_dev->addr_len);
4070 tmp_ss.ss_family = bond_dev->type;
4071
4072 /* unwind from head to the slave that failed */
4073 bond_for_each_slave(bond, rollback_slave, iter) {
4074 int tmp_res;
4075
4076 if (rollback_slave == slave)
4077 break;
4078
4079 tmp_res = dev_set_mac_address(rollback_slave->dev,
4080 (struct sockaddr *)&tmp_ss, NULL);
4081 if (tmp_res) {
4082 slave_dbg(bond_dev, rollback_slave->dev, "%s: unwind err %d\n",
4083 __func__, tmp_res);
4084 }
4085 }
4086
4087 return res;
4088 }
4089
4090 /**
4091 * bond_get_slave_by_id - get xmit slave with slave_id
4092 * @bond: bonding device that is transmitting
4093 * @slave_id: slave id up to slave_cnt-1 through which to transmit
4094 *
4095 * This function tries to get slave with slave_id but in case
4096 * it fails, it tries to find the first available slave for transmission.
4097 */
4098 static struct slave *bond_get_slave_by_id(struct bonding *bond,
4099 int slave_id)
4100 {
4101 struct list_head *iter;
4102 struct slave *slave;
4103 int i = slave_id;
4104
4105 /* Here we start from the slave with slave_id */
4106 bond_for_each_slave_rcu(bond, slave, iter) {
4107 if (--i < 0) {
4108 if (bond_slave_can_tx(slave))
4109 return slave;
4110 }
4111 }
4112
4113 /* Here we start from the first slave up to slave_id */
4114 i = slave_id;
4115 bond_for_each_slave_rcu(bond, slave, iter) {
4116 if (--i < 0)
4117 break;
4118 if (bond_slave_can_tx(slave))
4119 return slave;
4120 }
4121 /* no slave that can tx has been found */
4122 return NULL;
4123 }
4124
4125 /**
4126 * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
4127 * @bond: bonding device to use
4128 *
4129 * Based on the value of the bonding device's packets_per_slave parameter
4130 * this function generates a slave id, which is usually used as the next
4131 * slave to transmit through.
4132 */
4133 static u32 bond_rr_gen_slave_id(struct bonding *bond)
4134 {
4135 u32 slave_id;
4136 struct reciprocal_value reciprocal_packets_per_slave;
4137 int packets_per_slave = bond->params.packets_per_slave;
4138
4139 switch (packets_per_slave) {
4140 case 0:
4141 slave_id = prandom_u32();
4142 break;
4143 case 1:
4144 slave_id = bond->rr_tx_counter;
4145 break;
4146 default:
4147 reciprocal_packets_per_slave =
4148 bond->params.reciprocal_packets_per_slave;
4149 slave_id = reciprocal_divide(bond->rr_tx_counter,
4150 reciprocal_packets_per_slave);
4151 break;
4152 }
4153 bond->rr_tx_counter++;
4154
4155 return slave_id;
4156 }
4157
4158 static struct slave *bond_xmit_roundrobin_slave_get(struct bonding *bond,
4159 struct sk_buff *skb)
4160 {
4161 struct slave *slave;
4162 int slave_cnt;
4163 u32 slave_id;
4164
4165 /* Start with the curr_active_slave that joined the bond as the
4166 * default for sending IGMP traffic. For failover purposes one
4167 * needs to maintain some consistency for the interface that will
4168 * send the join/membership reports. The curr_active_slave found
4169 * will send all of this type of traffic.
4170 */
4171 if (skb->protocol == htons(ETH_P_IP)) {
4172 int noff = skb_network_offset(skb);
4173 struct iphdr *iph;
4174
4175 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
4176 goto non_igmp;
4177
4178 iph = ip_hdr(skb);
4179 if (iph->protocol == IPPROTO_IGMP) {
4180 slave = rcu_dereference(bond->curr_active_slave);
4181 if (slave)
4182 return slave;
4183 return bond_get_slave_by_id(bond, 0);
4184 }
4185 }
4186
4187 non_igmp:
4188 slave_cnt = READ_ONCE(bond->slave_cnt);
4189 if (likely(slave_cnt)) {
4190 slave_id = bond_rr_gen_slave_id(bond) % slave_cnt;
4191 return bond_get_slave_by_id(bond, slave_id);
4192 }
4193 return NULL;
4194 }
4195
4196 static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
4197 struct net_device *bond_dev)
4198 {
4199 struct bonding *bond = netdev_priv(bond_dev);
4200 struct slave *slave;
4201
4202 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4203 if (likely(slave))
4204 return bond_dev_queue_xmit(bond, skb, slave->dev);
4205
4206 return bond_tx_drop(bond_dev, skb);
4207 }
4208
4209 static struct slave *bond_xmit_activebackup_slave_get(struct bonding *bond,
4210 struct sk_buff *skb)
4211 {
4212 return rcu_dereference(bond->curr_active_slave);
4213 }
4214
4215 /* In active-backup mode, we know that bond->curr_active_slave is always valid if
4216 * the bond has a usable interface.
4217 */
4218 static netdev_tx_t bond_xmit_activebackup(struct sk_buff *skb,
4219 struct net_device *bond_dev)
4220 {
4221 struct bonding *bond = netdev_priv(bond_dev);
4222 struct slave *slave;
4223
4224 slave = bond_xmit_activebackup_slave_get(bond, skb);
4225 if (slave)
4226 return bond_dev_queue_xmit(bond, skb, slave->dev);
4227
4228 return bond_tx_drop(bond_dev, skb);
4229 }
4230
4231 /* Use this to update slave_array when (a) it's not appropriate to update
4232 * slave_array right away (note that update_slave_array() may sleep)
4233 * and / or (b) RTNL is not held.
4234 */
4235 void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay)
4236 {
4237 queue_delayed_work(bond->wq, &bond->slave_arr_work, delay);
4238 }
4239
4240 /* Slave array work handler. Holds only RTNL */
4241 static void bond_slave_arr_handler(struct work_struct *work)
4242 {
4243 struct bonding *bond = container_of(work, struct bonding,
4244 slave_arr_work.work);
4245 int ret;
4246
4247 if (!rtnl_trylock())
4248 goto err;
4249
4250 ret = bond_update_slave_arr(bond, NULL);
4251 rtnl_unlock();
4252 if (ret) {
4253 pr_warn_ratelimited("Failed to update slave array from WT\n");
4254 goto err;
4255 }
4256 return;
4257
4258 err:
4259 bond_slave_arr_work_rearm(bond, 1);
4260 }
4261
4262 static void bond_skip_slave(struct bond_up_slave *slaves,
4263 struct slave *skipslave)
4264 {
4265 int idx;
4266
4267 /* Rare situation where caller has asked to skip a specific
4268 * slave but allocation failed (most likely!). BTW this is
4269 * only possible when the call is initiated from
4270 * __bond_release_one(). In this situation; overwrite the
4271 * skipslave entry in the array with the last entry from the
4272 * array to avoid a situation where the xmit path may choose
4273 * this to-be-skipped slave to send a packet out.
4274 */
4275 for (idx = 0; slaves && idx < slaves->count; idx++) {
4276 if (skipslave == slaves->arr[idx]) {
4277 slaves->arr[idx] =
4278 slaves->arr[slaves->count - 1];
4279 slaves->count--;
4280 break;
4281 }
4282 }
4283 }
4284
4285 static void bond_set_slave_arr(struct bonding *bond,
4286 struct bond_up_slave *usable_slaves,
4287 struct bond_up_slave *all_slaves)
4288 {
4289 struct bond_up_slave *usable, *all;
4290
4291 usable = rtnl_dereference(bond->usable_slaves);
4292 rcu_assign_pointer(bond->usable_slaves, usable_slaves);
4293 kfree_rcu(usable, rcu);
4294
4295 all = rtnl_dereference(bond->all_slaves);
4296 rcu_assign_pointer(bond->all_slaves, all_slaves);
4297 kfree_rcu(all, rcu);
4298 }
4299
4300 static void bond_reset_slave_arr(struct bonding *bond)
4301 {
4302 struct bond_up_slave *usable, *all;
4303
4304 usable = rtnl_dereference(bond->usable_slaves);
4305 if (usable) {
4306 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4307 kfree_rcu(usable, rcu);
4308 }
4309
4310 all = rtnl_dereference(bond->all_slaves);
4311 if (all) {
4312 RCU_INIT_POINTER(bond->all_slaves, NULL);
4313 kfree_rcu(all, rcu);
4314 }
4315 }
4316
4317 /* Build the usable slaves array in control path for modes that use xmit-hash
4318 * to determine the slave interface -
4319 * (a) BOND_MODE_8023AD
4320 * (b) BOND_MODE_XOR
4321 * (c) (BOND_MODE_TLB || BOND_MODE_ALB) && tlb_dynamic_lb == 0
4322 *
4323 * The caller is expected to hold RTNL only and NO other lock!
4324 */
4325 int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave)
4326 {
4327 struct bond_up_slave *usable_slaves = NULL, *all_slaves = NULL;
4328 struct slave *slave;
4329 struct list_head *iter;
4330 int agg_id = 0;
4331 int ret = 0;
4332
4333 #ifdef CONFIG_LOCKDEP
4334 WARN_ON(lockdep_is_held(&bond->mode_lock));
4335 #endif
4336
4337 usable_slaves = kzalloc(struct_size(usable_slaves, arr,
4338 bond->slave_cnt), GFP_KERNEL);
4339 all_slaves = kzalloc(struct_size(all_slaves, arr,
4340 bond->slave_cnt), GFP_KERNEL);
4341 if (!usable_slaves || !all_slaves) {
4342 ret = -ENOMEM;
4343 goto out;
4344 }
4345 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4346 struct ad_info ad_info;
4347
4348 if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
4349 pr_debug("bond_3ad_get_active_agg_info failed\n");
4350 /* No active aggragator means it's not safe to use
4351 * the previous array.
4352 */
4353 bond_reset_slave_arr(bond);
4354 goto out;
4355 }
4356 agg_id = ad_info.aggregator_id;
4357 }
4358 bond_for_each_slave(bond, slave, iter) {
4359 if (skipslave == slave)
4360 continue;
4361
4362 all_slaves->arr[all_slaves->count++] = slave;
4363 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
4364 struct aggregator *agg;
4365
4366 agg = SLAVE_AD_INFO(slave)->port.aggregator;
4367 if (!agg || agg->aggregator_identifier != agg_id)
4368 continue;
4369 }
4370 if (!bond_slave_can_tx(slave))
4371 continue;
4372
4373 slave_dbg(bond->dev, slave->dev, "Adding slave to tx hash array[%d]\n",
4374 usable_slaves->count);
4375
4376 usable_slaves->arr[usable_slaves->count++] = slave;
4377 }
4378
4379 bond_set_slave_arr(bond, usable_slaves, all_slaves);
4380 return ret;
4381 out:
4382 if (ret != 0 && skipslave) {
4383 bond_skip_slave(rtnl_dereference(bond->all_slaves),
4384 skipslave);
4385 bond_skip_slave(rtnl_dereference(bond->usable_slaves),
4386 skipslave);
4387 }
4388 kfree_rcu(all_slaves, rcu);
4389 kfree_rcu(usable_slaves, rcu);
4390
4391 return ret;
4392 }
4393
4394 static struct slave *bond_xmit_3ad_xor_slave_get(struct bonding *bond,
4395 struct sk_buff *skb,
4396 struct bond_up_slave *slaves)
4397 {
4398 struct slave *slave;
4399 unsigned int count;
4400 u32 hash;
4401
4402 hash = bond_xmit_hash(bond, skb);
4403 count = slaves ? READ_ONCE(slaves->count) : 0;
4404 if (unlikely(!count))
4405 return NULL;
4406
4407 slave = slaves->arr[hash % count];
4408 return slave;
4409 }
4410
4411 /* Use this Xmit function for 3AD as well as XOR modes. The current
4412 * usable slave array is formed in the control path. The xmit function
4413 * just calculates hash and sends the packet out.
4414 */
4415 static netdev_tx_t bond_3ad_xor_xmit(struct sk_buff *skb,
4416 struct net_device *dev)
4417 {
4418 struct bonding *bond = netdev_priv(dev);
4419 struct bond_up_slave *slaves;
4420 struct slave *slave;
4421
4422 slaves = rcu_dereference(bond->usable_slaves);
4423 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4424 if (likely(slave))
4425 return bond_dev_queue_xmit(bond, skb, slave->dev);
4426
4427 return bond_tx_drop(dev, skb);
4428 }
4429
4430 /* in broadcast mode, we send everything to all usable interfaces. */
4431 static netdev_tx_t bond_xmit_broadcast(struct sk_buff *skb,
4432 struct net_device *bond_dev)
4433 {
4434 struct bonding *bond = netdev_priv(bond_dev);
4435 struct slave *slave = NULL;
4436 struct list_head *iter;
4437
4438 bond_for_each_slave_rcu(bond, slave, iter) {
4439 if (bond_is_last_slave(bond, slave))
4440 break;
4441 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
4442 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4443
4444 if (!skb2) {
4445 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
4446 bond_dev->name, __func__);
4447 continue;
4448 }
4449 bond_dev_queue_xmit(bond, skb2, slave->dev);
4450 }
4451 }
4452 if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
4453 return bond_dev_queue_xmit(bond, skb, slave->dev);
4454
4455 return bond_tx_drop(bond_dev, skb);
4456 }
4457
4458 /*------------------------- Device initialization ---------------------------*/
4459
4460 /* Lookup the slave that corresponds to a qid */
4461 static inline int bond_slave_override(struct bonding *bond,
4462 struct sk_buff *skb)
4463 {
4464 struct slave *slave = NULL;
4465 struct list_head *iter;
4466
4467 if (!skb_rx_queue_recorded(skb))
4468 return 1;
4469
4470 /* Find out if any slaves have the same mapping as this skb. */
4471 bond_for_each_slave_rcu(bond, slave, iter) {
4472 if (slave->queue_id == skb_get_queue_mapping(skb)) {
4473 if (bond_slave_is_up(slave) &&
4474 slave->link == BOND_LINK_UP) {
4475 bond_dev_queue_xmit(bond, skb, slave->dev);
4476 return 0;
4477 }
4478 /* If the slave isn't UP, use default transmit policy. */
4479 break;
4480 }
4481 }
4482
4483 return 1;
4484 }
4485
4486
4487 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
4488 struct net_device *sb_dev)
4489 {
4490 /* This helper function exists to help dev_pick_tx get the correct
4491 * destination queue. Using a helper function skips a call to
4492 * skb_tx_hash and will put the skbs in the queue we expect on their
4493 * way down to the bonding driver.
4494 */
4495 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4496
4497 /* Save the original txq to restore before passing to the driver */
4498 qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb_get_queue_mapping(skb);
4499
4500 if (unlikely(txq >= dev->real_num_tx_queues)) {
4501 do {
4502 txq -= dev->real_num_tx_queues;
4503 } while (txq >= dev->real_num_tx_queues);
4504 }
4505 return txq;
4506 }
4507
4508 static struct net_device *bond_xmit_get_slave(struct net_device *master_dev,
4509 struct sk_buff *skb,
4510 bool all_slaves)
4511 {
4512 struct bonding *bond = netdev_priv(master_dev);
4513 struct bond_up_slave *slaves;
4514 struct slave *slave = NULL;
4515
4516 switch (BOND_MODE(bond)) {
4517 case BOND_MODE_ROUNDROBIN:
4518 slave = bond_xmit_roundrobin_slave_get(bond, skb);
4519 break;
4520 case BOND_MODE_ACTIVEBACKUP:
4521 slave = bond_xmit_activebackup_slave_get(bond, skb);
4522 break;
4523 case BOND_MODE_8023AD:
4524 case BOND_MODE_XOR:
4525 if (all_slaves)
4526 slaves = rcu_dereference(bond->all_slaves);
4527 else
4528 slaves = rcu_dereference(bond->usable_slaves);
4529 slave = bond_xmit_3ad_xor_slave_get(bond, skb, slaves);
4530 break;
4531 case BOND_MODE_BROADCAST:
4532 break;
4533 case BOND_MODE_ALB:
4534 slave = bond_xmit_alb_slave_get(bond, skb);
4535 break;
4536 case BOND_MODE_TLB:
4537 slave = bond_xmit_tlb_slave_get(bond, skb);
4538 break;
4539 default:
4540 /* Should never happen, mode already checked */
4541 WARN_ONCE(true, "Unknown bonding mode");
4542 break;
4543 }
4544
4545 if (slave)
4546 return slave->dev;
4547 return NULL;
4548 }
4549
4550 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4551 {
4552 struct bonding *bond = netdev_priv(dev);
4553
4554 if (bond_should_override_tx_queue(bond) &&
4555 !bond_slave_override(bond, skb))
4556 return NETDEV_TX_OK;
4557
4558 switch (BOND_MODE(bond)) {
4559 case BOND_MODE_ROUNDROBIN:
4560 return bond_xmit_roundrobin(skb, dev);
4561 case BOND_MODE_ACTIVEBACKUP:
4562 return bond_xmit_activebackup(skb, dev);
4563 case BOND_MODE_8023AD:
4564 case BOND_MODE_XOR:
4565 return bond_3ad_xor_xmit(skb, dev);
4566 case BOND_MODE_BROADCAST:
4567 return bond_xmit_broadcast(skb, dev);
4568 case BOND_MODE_ALB:
4569 return bond_alb_xmit(skb, dev);
4570 case BOND_MODE_TLB:
4571 return bond_tlb_xmit(skb, dev);
4572 default:
4573 /* Should never happen, mode already checked */
4574 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
4575 WARN_ON_ONCE(1);
4576 return bond_tx_drop(dev, skb);
4577 }
4578 }
4579
4580 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4581 {
4582 struct bonding *bond = netdev_priv(dev);
4583 netdev_tx_t ret = NETDEV_TX_OK;
4584
4585 /* If we risk deadlock from transmitting this in the
4586 * netpoll path, tell netpoll to queue the frame for later tx
4587 */
4588 if (unlikely(is_netpoll_tx_blocked(dev)))
4589 return NETDEV_TX_BUSY;
4590
4591 rcu_read_lock();
4592 if (bond_has_slaves(bond))
4593 ret = __bond_start_xmit(skb, dev);
4594 else
4595 ret = bond_tx_drop(dev, skb);
4596 rcu_read_unlock();
4597
4598 return ret;
4599 }
4600
4601 static u32 bond_mode_bcast_speed(struct slave *slave, u32 speed)
4602 {
4603 if (speed == 0 || speed == SPEED_UNKNOWN)
4604 speed = slave->speed;
4605 else
4606 speed = min(speed, slave->speed);
4607
4608 return speed;
4609 }
4610
4611 static int bond_ethtool_get_link_ksettings(struct net_device *bond_dev,
4612 struct ethtool_link_ksettings *cmd)
4613 {
4614 struct bonding *bond = netdev_priv(bond_dev);
4615 struct list_head *iter;
4616 struct slave *slave;
4617 u32 speed = 0;
4618
4619 cmd->base.duplex = DUPLEX_UNKNOWN;
4620 cmd->base.port = PORT_OTHER;
4621
4622 /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
4623 * do not need to check mode. Though link speed might not represent
4624 * the true receive or transmit bandwidth (not all modes are symmetric)
4625 * this is an accurate maximum.
4626 */
4627 bond_for_each_slave(bond, slave, iter) {
4628 if (bond_slave_can_tx(slave)) {
4629 if (slave->speed != SPEED_UNKNOWN) {
4630 if (BOND_MODE(bond) == BOND_MODE_BROADCAST)
4631 speed = bond_mode_bcast_speed(slave,
4632 speed);
4633 else
4634 speed += slave->speed;
4635 }
4636 if (cmd->base.duplex == DUPLEX_UNKNOWN &&
4637 slave->duplex != DUPLEX_UNKNOWN)
4638 cmd->base.duplex = slave->duplex;
4639 }
4640 }
4641 cmd->base.speed = speed ? : SPEED_UNKNOWN;
4642
4643 return 0;
4644 }
4645
4646 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4647 struct ethtool_drvinfo *drvinfo)
4648 {
4649 strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
4650 snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
4651 BOND_ABI_VERSION);
4652 }
4653
4654 static const struct ethtool_ops bond_ethtool_ops = {
4655 .get_drvinfo = bond_ethtool_get_drvinfo,
4656 .get_link = ethtool_op_get_link,
4657 .get_link_ksettings = bond_ethtool_get_link_ksettings,
4658 };
4659
4660 static const struct net_device_ops bond_netdev_ops = {
4661 .ndo_init = bond_init,
4662 .ndo_uninit = bond_uninit,
4663 .ndo_open = bond_open,
4664 .ndo_stop = bond_close,
4665 .ndo_start_xmit = bond_start_xmit,
4666 .ndo_select_queue = bond_select_queue,
4667 .ndo_get_stats64 = bond_get_stats,
4668 .ndo_do_ioctl = bond_do_ioctl,
4669 .ndo_change_rx_flags = bond_change_rx_flags,
4670 .ndo_set_rx_mode = bond_set_rx_mode,
4671 .ndo_change_mtu = bond_change_mtu,
4672 .ndo_set_mac_address = bond_set_mac_address,
4673 .ndo_neigh_setup = bond_neigh_setup,
4674 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4675 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4676 #ifdef CONFIG_NET_POLL_CONTROLLER
4677 .ndo_netpoll_setup = bond_netpoll_setup,
4678 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4679 .ndo_poll_controller = bond_poll_controller,
4680 #endif
4681 .ndo_add_slave = bond_enslave,
4682 .ndo_del_slave = bond_release,
4683 .ndo_fix_features = bond_fix_features,
4684 .ndo_features_check = passthru_features_check,
4685 .ndo_get_xmit_slave = bond_xmit_get_slave,
4686 };
4687
4688 static const struct device_type bond_type = {
4689 .name = "bond",
4690 };
4691
4692 static void bond_destructor(struct net_device *bond_dev)
4693 {
4694 struct bonding *bond = netdev_priv(bond_dev);
4695 if (bond->wq)
4696 destroy_workqueue(bond->wq);
4697 }
4698
4699 void bond_setup(struct net_device *bond_dev)
4700 {
4701 struct bonding *bond = netdev_priv(bond_dev);
4702
4703 spin_lock_init(&bond->mode_lock);
4704 bond->params = bonding_defaults;
4705
4706 /* Initialize pointers */
4707 bond->dev = bond_dev;
4708
4709 /* Initialize the device entry points */
4710 ether_setup(bond_dev);
4711 bond_dev->max_mtu = ETH_MAX_MTU;
4712 bond_dev->netdev_ops = &bond_netdev_ops;
4713 bond_dev->ethtool_ops = &bond_ethtool_ops;
4714
4715 bond_dev->needs_free_netdev = true;
4716 bond_dev->priv_destructor = bond_destructor;
4717
4718 SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
4719
4720 /* Initialize the device options */
4721 bond_dev->flags |= IFF_MASTER;
4722 bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT | IFF_NO_QUEUE;
4723 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4724
4725 #ifdef CONFIG_XFRM_OFFLOAD
4726 /* set up xfrm device ops (only supported in active-backup right now) */
4727 bond_dev->xfrmdev_ops = &bond_xfrmdev_ops;
4728 bond->xs = NULL;
4729 #endif /* CONFIG_XFRM_OFFLOAD */
4730
4731 /* don't acquire bond device's netif_tx_lock when transmitting */
4732 bond_dev->features |= NETIF_F_LLTX;
4733
4734 /* By default, we declare the bond to be fully
4735 * VLAN hardware accelerated capable. Special
4736 * care is taken in the various xmit functions
4737 * when there are slaves that are not hw accel
4738 * capable
4739 */
4740
4741 /* Don't allow bond devices to change network namespaces. */
4742 bond_dev->features |= NETIF_F_NETNS_LOCAL;
4743
4744 bond_dev->hw_features = BOND_VLAN_FEATURES |
4745 NETIF_F_HW_VLAN_CTAG_RX |
4746 NETIF_F_HW_VLAN_CTAG_FILTER;
4747
4748 bond_dev->hw_features |= NETIF_F_GSO_ENCAP_ALL;
4749 bond_dev->features |= bond_dev->hw_features;
4750 bond_dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
4751 #ifdef CONFIG_XFRM_OFFLOAD
4752 bond_dev->hw_features |= BOND_XFRM_FEATURES;
4753 /* Only enable XFRM features if this is an active-backup config */
4754 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
4755 bond_dev->features |= BOND_XFRM_FEATURES;
4756 #endif /* CONFIG_XFRM_OFFLOAD */
4757 }
4758
4759 /* Destroy a bonding device.
4760 * Must be under rtnl_lock when this function is called.
4761 */
4762 static void bond_uninit(struct net_device *bond_dev)
4763 {
4764 struct bonding *bond = netdev_priv(bond_dev);
4765 struct bond_up_slave *usable, *all;
4766 struct list_head *iter;
4767 struct slave *slave;
4768
4769 bond_netpoll_cleanup(bond_dev);
4770
4771 /* Release the bonded slaves */
4772 bond_for_each_slave(bond, slave, iter)
4773 __bond_release_one(bond_dev, slave->dev, true, true);
4774 netdev_info(bond_dev, "Released all slaves\n");
4775
4776 usable = rtnl_dereference(bond->usable_slaves);
4777 if (usable) {
4778 RCU_INIT_POINTER(bond->usable_slaves, NULL);
4779 kfree_rcu(usable, rcu);
4780 }
4781
4782 all = rtnl_dereference(bond->all_slaves);
4783 if (all) {
4784 RCU_INIT_POINTER(bond->all_slaves, NULL);
4785 kfree_rcu(all, rcu);
4786 }
4787
4788 list_del(&bond->bond_list);
4789
4790 bond_debug_unregister(bond);
4791 }
4792
4793 /*------------------------- Module initialization ---------------------------*/
4794
4795 static int bond_check_params(struct bond_params *params)
4796 {
4797 int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4798 struct bond_opt_value newval;
4799 const struct bond_opt_value *valptr;
4800 int arp_all_targets_value = 0;
4801 u16 ad_actor_sys_prio = 0;
4802 u16 ad_user_port_key = 0;
4803 __be32 arp_target[BOND_MAX_ARP_TARGETS] = { 0 };
4804 int arp_ip_count;
4805 int bond_mode = BOND_MODE_ROUNDROBIN;
4806 int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
4807 int lacp_fast = 0;
4808 int tlb_dynamic_lb;
4809
4810 /* Convert string parameters. */
4811 if (mode) {
4812 bond_opt_initstr(&newval, mode);
4813 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4814 if (!valptr) {
4815 pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4816 return -EINVAL;
4817 }
4818 bond_mode = valptr->value;
4819 }
4820
4821 if (xmit_hash_policy) {
4822 if (bond_mode == BOND_MODE_ROUNDROBIN ||
4823 bond_mode == BOND_MODE_ACTIVEBACKUP ||
4824 bond_mode == BOND_MODE_BROADCAST) {
4825 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4826 bond_mode_name(bond_mode));
4827 } else {
4828 bond_opt_initstr(&newval, xmit_hash_policy);
4829 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4830 &newval);
4831 if (!valptr) {
4832 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4833 xmit_hash_policy);
4834 return -EINVAL;
4835 }
4836 xmit_hashtype = valptr->value;
4837 }
4838 }
4839
4840 if (lacp_rate) {
4841 if (bond_mode != BOND_MODE_8023AD) {
4842 pr_info("lacp_rate param is irrelevant in mode %s\n",
4843 bond_mode_name(bond_mode));
4844 } else {
4845 bond_opt_initstr(&newval, lacp_rate);
4846 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4847 &newval);
4848 if (!valptr) {
4849 pr_err("Error: Invalid lacp rate \"%s\"\n",
4850 lacp_rate);
4851 return -EINVAL;
4852 }
4853 lacp_fast = valptr->value;
4854 }
4855 }
4856
4857 if (ad_select) {
4858 bond_opt_initstr(&newval, ad_select);
4859 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4860 &newval);
4861 if (!valptr) {
4862 pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4863 return -EINVAL;
4864 }
4865 params->ad_select = valptr->value;
4866 if (bond_mode != BOND_MODE_8023AD)
4867 pr_warn("ad_select param only affects 802.3ad mode\n");
4868 } else {
4869 params->ad_select = BOND_AD_STABLE;
4870 }
4871
4872 if (max_bonds < 0) {
4873 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4874 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4875 max_bonds = BOND_DEFAULT_MAX_BONDS;
4876 }
4877
4878 if (miimon < 0) {
4879 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4880 miimon, INT_MAX);
4881 miimon = 0;
4882 }
4883
4884 if (updelay < 0) {
4885 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4886 updelay, INT_MAX);
4887 updelay = 0;
4888 }
4889
4890 if (downdelay < 0) {
4891 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4892 downdelay, INT_MAX);
4893 downdelay = 0;
4894 }
4895
4896 if ((use_carrier != 0) && (use_carrier != 1)) {
4897 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4898 use_carrier);
4899 use_carrier = 1;
4900 }
4901
4902 if (num_peer_notif < 0 || num_peer_notif > 255) {
4903 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4904 num_peer_notif);
4905 num_peer_notif = 1;
4906 }
4907
4908 /* reset values for 802.3ad/TLB/ALB */
4909 if (!bond_mode_uses_arp(bond_mode)) {
4910 if (!miimon) {
4911 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");
4912 pr_warn("Forcing miimon to 100msec\n");
4913 miimon = BOND_DEFAULT_MIIMON;
4914 }
4915 }
4916
4917 if (tx_queues < 1 || tx_queues > 255) {
4918 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4919 tx_queues, BOND_DEFAULT_TX_QUEUES);
4920 tx_queues = BOND_DEFAULT_TX_QUEUES;
4921 }
4922
4923 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4924 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4925 all_slaves_active);
4926 all_slaves_active = 0;
4927 }
4928
4929 if (resend_igmp < 0 || resend_igmp > 255) {
4930 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4931 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4932 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4933 }
4934
4935 bond_opt_initval(&newval, packets_per_slave);
4936 if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4937 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4938 packets_per_slave, USHRT_MAX);
4939 packets_per_slave = 1;
4940 }
4941
4942 if (bond_mode == BOND_MODE_ALB) {
4943 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",
4944 updelay);
4945 }
4946
4947 if (!miimon) {
4948 if (updelay || downdelay) {
4949 /* just warn the user the up/down delay will have
4950 * no effect since miimon is zero...
4951 */
4952 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",
4953 updelay, downdelay);
4954 }
4955 } else {
4956 /* don't allow arp monitoring */
4957 if (arp_interval) {
4958 pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4959 miimon, arp_interval);
4960 arp_interval = 0;
4961 }
4962
4963 if ((updelay % miimon) != 0) {
4964 pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4965 updelay, miimon, (updelay / miimon) * miimon);
4966 }
4967
4968 updelay /= miimon;
4969
4970 if ((downdelay % miimon) != 0) {
4971 pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4972 downdelay, miimon,
4973 (downdelay / miimon) * miimon);
4974 }
4975
4976 downdelay /= miimon;
4977 }
4978
4979 if (arp_interval < 0) {
4980 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4981 arp_interval, INT_MAX);
4982 arp_interval = 0;
4983 }
4984
4985 for (arp_ip_count = 0, i = 0;
4986 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4987 __be32 ip;
4988
4989 /* not a complete check, but good enough to catch mistakes */
4990 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4991 !bond_is_ip_target_ok(ip)) {
4992 pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4993 arp_ip_target[i]);
4994 arp_interval = 0;
4995 } else {
4996 if (bond_get_targets_ip(arp_target, ip) == -1)
4997 arp_target[arp_ip_count++] = ip;
4998 else
4999 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
5000 &ip);
5001 }
5002 }
5003
5004 if (arp_interval && !arp_ip_count) {
5005 /* don't allow arping if no arp_ip_target given... */
5006 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
5007 arp_interval);
5008 arp_interval = 0;
5009 }
5010
5011 if (arp_validate) {
5012 if (!arp_interval) {
5013 pr_err("arp_validate requires arp_interval\n");
5014 return -EINVAL;
5015 }
5016
5017 bond_opt_initstr(&newval, arp_validate);
5018 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
5019 &newval);
5020 if (!valptr) {
5021 pr_err("Error: invalid arp_validate \"%s\"\n",
5022 arp_validate);
5023 return -EINVAL;
5024 }
5025 arp_validate_value = valptr->value;
5026 } else {
5027 arp_validate_value = 0;
5028 }
5029
5030 if (arp_all_targets) {
5031 bond_opt_initstr(&newval, arp_all_targets);
5032 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
5033 &newval);
5034 if (!valptr) {
5035 pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
5036 arp_all_targets);
5037 arp_all_targets_value = 0;
5038 } else {
5039 arp_all_targets_value = valptr->value;
5040 }
5041 }
5042
5043 if (miimon) {
5044 pr_info("MII link monitoring set to %d ms\n", miimon);
5045 } else if (arp_interval) {
5046 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
5047 arp_validate_value);
5048 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
5049 arp_interval, valptr->string, arp_ip_count);
5050
5051 for (i = 0; i < arp_ip_count; i++)
5052 pr_cont(" %s", arp_ip_target[i]);
5053
5054 pr_cont("\n");
5055
5056 } else if (max_bonds) {
5057 /* miimon and arp_interval not set, we need one so things
5058 * work as expected, see bonding.txt for details
5059 */
5060 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");
5061 }
5062
5063 if (primary && !bond_mode_uses_primary(bond_mode)) {
5064 /* currently, using a primary only makes sense
5065 * in active backup, TLB or ALB modes
5066 */
5067 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
5068 primary, bond_mode_name(bond_mode));
5069 primary = NULL;
5070 }
5071
5072 if (primary && primary_reselect) {
5073 bond_opt_initstr(&newval, primary_reselect);
5074 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
5075 &newval);
5076 if (!valptr) {
5077 pr_err("Error: Invalid primary_reselect \"%s\"\n",
5078 primary_reselect);
5079 return -EINVAL;
5080 }
5081 primary_reselect_value = valptr->value;
5082 } else {
5083 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
5084 }
5085
5086 if (fail_over_mac) {
5087 bond_opt_initstr(&newval, fail_over_mac);
5088 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
5089 &newval);
5090 if (!valptr) {
5091 pr_err("Error: invalid fail_over_mac \"%s\"\n",
5092 fail_over_mac);
5093 return -EINVAL;
5094 }
5095 fail_over_mac_value = valptr->value;
5096 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
5097 pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
5098 } else {
5099 fail_over_mac_value = BOND_FOM_NONE;
5100 }
5101
5102 bond_opt_initstr(&newval, "default");
5103 valptr = bond_opt_parse(
5104 bond_opt_get(BOND_OPT_AD_ACTOR_SYS_PRIO),
5105 &newval);
5106 if (!valptr) {
5107 pr_err("Error: No ad_actor_sys_prio default value");
5108 return -EINVAL;
5109 }
5110 ad_actor_sys_prio = valptr->value;
5111
5112 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_USER_PORT_KEY),
5113 &newval);
5114 if (!valptr) {
5115 pr_err("Error: No ad_user_port_key default value");
5116 return -EINVAL;
5117 }
5118 ad_user_port_key = valptr->value;
5119
5120 bond_opt_initstr(&newval, "default");
5121 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_TLB_DYNAMIC_LB), &newval);
5122 if (!valptr) {
5123 pr_err("Error: No tlb_dynamic_lb default value");
5124 return -EINVAL;
5125 }
5126 tlb_dynamic_lb = valptr->value;
5127
5128 if (lp_interval == 0) {
5129 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
5130 INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
5131 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
5132 }
5133
5134 /* fill params struct with the proper values */
5135 params->mode = bond_mode;
5136 params->xmit_policy = xmit_hashtype;
5137 params->miimon = miimon;
5138 params->num_peer_notif = num_peer_notif;
5139 params->arp_interval = arp_interval;
5140 params->arp_validate = arp_validate_value;
5141 params->arp_all_targets = arp_all_targets_value;
5142 params->updelay = updelay;
5143 params->downdelay = downdelay;
5144 params->peer_notif_delay = 0;
5145 params->use_carrier = use_carrier;
5146 params->lacp_fast = lacp_fast;
5147 params->primary[0] = 0;
5148 params->primary_reselect = primary_reselect_value;
5149 params->fail_over_mac = fail_over_mac_value;
5150 params->tx_queues = tx_queues;
5151 params->all_slaves_active = all_slaves_active;
5152 params->resend_igmp = resend_igmp;
5153 params->min_links = min_links;
5154 params->lp_interval = lp_interval;
5155 params->packets_per_slave = packets_per_slave;
5156 params->tlb_dynamic_lb = tlb_dynamic_lb;
5157 params->ad_actor_sys_prio = ad_actor_sys_prio;
5158 eth_zero_addr(params->ad_actor_system);
5159 params->ad_user_port_key = ad_user_port_key;
5160 if (packets_per_slave > 0) {
5161 params->reciprocal_packets_per_slave =
5162 reciprocal_value(packets_per_slave);
5163 } else {
5164 /* reciprocal_packets_per_slave is unused if
5165 * packets_per_slave is 0 or 1, just initialize it
5166 */
5167 params->reciprocal_packets_per_slave =
5168 (struct reciprocal_value) { 0 };
5169 }
5170
5171 if (primary) {
5172 strncpy(params->primary, primary, IFNAMSIZ);
5173 params->primary[IFNAMSIZ - 1] = 0;
5174 }
5175
5176 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
5177
5178 return 0;
5179 }
5180
5181 /* Called from registration process */
5182 static int bond_init(struct net_device *bond_dev)
5183 {
5184 struct bonding *bond = netdev_priv(bond_dev);
5185 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
5186
5187 netdev_dbg(bond_dev, "Begin bond_init\n");
5188
5189 bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
5190 if (!bond->wq)
5191 return -ENOMEM;
5192
5193 spin_lock_init(&bond->stats_lock);
5194 netdev_lockdep_set_classes(bond_dev);
5195
5196 list_add_tail(&bond->bond_list, &bn->dev_list);
5197
5198 bond_prepare_sysfs_group(bond);
5199
5200 bond_debug_register(bond);
5201
5202 /* Ensure valid dev_addr */
5203 if (is_zero_ether_addr(bond_dev->dev_addr) &&
5204 bond_dev->addr_assign_type == NET_ADDR_PERM)
5205 eth_hw_addr_random(bond_dev);
5206
5207 return 0;
5208 }
5209
5210 unsigned int bond_get_num_tx_queues(void)
5211 {
5212 return tx_queues;
5213 }
5214
5215 /* Create a new bond based on the specified name and bonding parameters.
5216 * If name is NULL, obtain a suitable "bond%d" name for us.
5217 * Caller must NOT hold rtnl_lock; we need to release it here before we
5218 * set up our sysfs entries.
5219 */
5220 int bond_create(struct net *net, const char *name)
5221 {
5222 struct net_device *bond_dev;
5223 struct bonding *bond;
5224 struct alb_bond_info *bond_info;
5225 int res;
5226
5227 rtnl_lock();
5228
5229 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
5230 name ? name : "bond%d", NET_NAME_UNKNOWN,
5231 bond_setup, tx_queues);
5232 if (!bond_dev) {
5233 pr_err("%s: eek! can't alloc netdev!\n", name);
5234 rtnl_unlock();
5235 return -ENOMEM;
5236 }
5237
5238 /*
5239 * Initialize rx_hashtbl_used_head to RLB_NULL_INDEX.
5240 * It is set to 0 by default which is wrong.
5241 */
5242 bond = netdev_priv(bond_dev);
5243 bond_info = &(BOND_ALB_INFO(bond));
5244 bond_info->rx_hashtbl_used_head = RLB_NULL_INDEX;
5245
5246 dev_net_set(bond_dev, net);
5247 bond_dev->rtnl_link_ops = &bond_link_ops;
5248
5249 res = register_netdevice(bond_dev);
5250 if (res < 0) {
5251 free_netdev(bond_dev);
5252 rtnl_unlock();
5253
5254 return res;
5255 }
5256
5257 netif_carrier_off(bond_dev);
5258
5259 bond_work_init_all(bond);
5260
5261 rtnl_unlock();
5262 return 0;
5263 }
5264
5265 static int __net_init bond_net_init(struct net *net)
5266 {
5267 struct bond_net *bn = net_generic(net, bond_net_id);
5268
5269 bn->net = net;
5270 INIT_LIST_HEAD(&bn->dev_list);
5271
5272 bond_create_proc_dir(bn);
5273 bond_create_sysfs(bn);
5274
5275 return 0;
5276 }
5277
5278 static void __net_exit bond_net_exit(struct net *net)
5279 {
5280 struct bond_net *bn = net_generic(net, bond_net_id);
5281 struct bonding *bond, *tmp_bond;
5282 LIST_HEAD(list);
5283
5284 bond_destroy_sysfs(bn);
5285
5286 /* Kill off any bonds created after unregistering bond rtnl ops */
5287 rtnl_lock();
5288 list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
5289 unregister_netdevice_queue(bond->dev, &list);
5290 unregister_netdevice_many(&list);
5291 rtnl_unlock();
5292
5293 bond_destroy_proc_dir(bn);
5294 }
5295
5296 static struct pernet_operations bond_net_ops = {
5297 .init = bond_net_init,
5298 .exit = bond_net_exit,
5299 .id = &bond_net_id,
5300 .size = sizeof(struct bond_net),
5301 };
5302
5303 static int __init bonding_init(void)
5304 {
5305 int i;
5306 int res;
5307
5308 res = bond_check_params(&bonding_defaults);
5309 if (res)
5310 goto out;
5311
5312 res = register_pernet_subsys(&bond_net_ops);
5313 if (res)
5314 goto out;
5315
5316 res = bond_netlink_init();
5317 if (res)
5318 goto err_link;
5319
5320 bond_create_debugfs();
5321
5322 for (i = 0; i < max_bonds; i++) {
5323 res = bond_create(&init_net, NULL);
5324 if (res)
5325 goto err;
5326 }
5327
5328 skb_flow_dissector_init(&flow_keys_bonding,
5329 flow_keys_bonding_keys,
5330 ARRAY_SIZE(flow_keys_bonding_keys));
5331
5332 register_netdevice_notifier(&bond_netdev_notifier);
5333 out:
5334 return res;
5335 err:
5336 bond_destroy_debugfs();
5337 bond_netlink_fini();
5338 err_link:
5339 unregister_pernet_subsys(&bond_net_ops);
5340 goto out;
5341
5342 }
5343
5344 static void __exit bonding_exit(void)
5345 {
5346 unregister_netdevice_notifier(&bond_netdev_notifier);
5347
5348 bond_destroy_debugfs();
5349
5350 bond_netlink_fini();
5351 unregister_pernet_subsys(&bond_net_ops);
5352
5353 #ifdef CONFIG_NET_POLL_CONTROLLER
5354 /* Make sure we don't have an imbalance on our netpoll blocking */
5355 WARN_ON(atomic_read(&netpoll_block_tx));
5356 #endif
5357 }
5358
5359 module_init(bonding_init);
5360 module_exit(bonding_exit);
5361 MODULE_LICENSE("GPL");
5362 MODULE_DESCRIPTION(DRV_DESCRIPTION);
5363 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
Linux with added FPC-III support