2 * originally based on the dummy device.
4 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
5 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
7 * bonding.c: an Ethernet Bonding driver
9 * This is useful to talk to a Cisco EtherChannel compatible equipment:
11 * Sun Trunking (Solaris)
12 * Alteon AceDirector Trunks
14 * and probably many L2 switches ...
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.
24 * will release all slaves, marking them as down.
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.
34 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/fcntl.h>
40 #include <linux/interrupt.h>
41 #include <linux/ptrace.h>
42 #include <linux/ioport.h>
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>
57 #include <asm/system.h>
59 #include <linux/uaccess.h>
60 #include <linux/errno.h>
61 #include <linux/netdevice.h>
62 #include <linux/inetdevice.h>
63 #include <linux/igmp.h>
64 #include <linux/etherdevice.h>
65 #include <linux/skbuff.h>
67 #include <linux/rtnetlink.h>
68 #include <linux/smp.h>
69 #include <linux/if_ether.h>
71 #include <linux/mii.h>
72 #include <linux/ethtool.h>
73 #include <linux/if_vlan.h>
74 #include <linux/if_bonding.h>
75 #include <linux/jiffies.h>
76 #include <linux/preempt.h>
77 #include <net/route.h>
78 #include <net/net_namespace.h>
79 #include <net/netns/generic.h>
84 /*---------------------------- Module parameters ----------------------------*/
86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
87 #define BOND_LINK_MON_INTERV 0
88 #define BOND_LINK_ARP_INTERV 0
90 static int max_bonds = BOND_DEFAULT_MAX_BONDS;
91 static int tx_queues = BOND_DEFAULT_TX_QUEUES;
92 static int num_peer_notif = 1;
93 static int miimon = BOND_LINK_MON_INTERV;
96 static int use_carrier = 1;
99 static char *primary_reselect;
100 static char *lacp_rate;
101 static int min_links;
102 static char *ad_select;
103 static char *xmit_hash_policy;
104 static int arp_interval = BOND_LINK_ARP_INTERV;
105 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
106 static char *arp_validate;
107 static char *fail_over_mac;
108 static int all_slaves_active = 0;
109 static struct bond_params bonding_defaults;
110 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
112 module_param(max_bonds, int, 0);
113 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
114 module_param(tx_queues, int, 0);
115 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
116 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
117 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
118 "failover event (alias of num_unsol_na)");
119 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
120 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
121 "failover event (alias of num_grat_arp)");
122 module_param(miimon, int, 0);
123 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
124 module_param(updelay, int, 0);
125 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
126 module_param(downdelay, int, 0);
127 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
129 module_param(use_carrier, int, 0);
130 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
131 "0 for off, 1 for on (default)");
132 module_param(mode, charp, 0);
133 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
134 "1 for active-backup, 2 for balance-xor, "
135 "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
136 "6 for balance-alb");
137 module_param(primary, charp, 0);
138 MODULE_PARM_DESC(primary, "Primary network device to use");
139 module_param(primary_reselect, charp, 0);
140 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
142 "0 for always (default), "
143 "1 for only if speed of primary is "
145 "2 for only on active slave "
147 module_param(lacp_rate, charp, 0);
148 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
149 "0 for slow, 1 for fast");
150 module_param(ad_select, charp, 0);
151 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
152 "0 for stable (default), 1 for bandwidth, "
154 module_param(min_links, int, 0);
155 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
157 module_param(xmit_hash_policy, charp, 0);
158 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
159 "0 for layer 2 (default), 1 for layer 3+4, "
161 module_param(arp_interval, int, 0);
162 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
163 module_param_array(arp_ip_target, charp, NULL, 0);
164 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
165 module_param(arp_validate, charp, 0);
166 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
167 "0 for none (default), 1 for active, "
168 "2 for backup, 3 for all");
169 module_param(fail_over_mac, charp, 0);
170 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
171 "the same MAC; 0 for none (default), "
172 "1 for active, 2 for follow");
173 module_param(all_slaves_active, int, 0);
174 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
175 "by setting active flag for all slaves; "
176 "0 for never (default), 1 for always.");
177 module_param(resend_igmp, int, 0);
178 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
181 /*----------------------------- Global variables ----------------------------*/
183 #ifdef CONFIG_NET_POLL_CONTROLLER
184 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
187 int bond_net_id __read_mostly;
189 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
190 static int arp_ip_count;
191 static int bond_mode = BOND_MODE_ROUNDROBIN;
192 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
193 static int lacp_fast;
195 const struct bond_parm_tbl bond_lacp_tbl[] = {
196 { "slow", AD_LACP_SLOW},
197 { "fast", AD_LACP_FAST},
201 const struct bond_parm_tbl bond_mode_tbl[] = {
202 { "balance-rr", BOND_MODE_ROUNDROBIN},
203 { "active-backup", BOND_MODE_ACTIVEBACKUP},
204 { "balance-xor", BOND_MODE_XOR},
205 { "broadcast", BOND_MODE_BROADCAST},
206 { "802.3ad", BOND_MODE_8023AD},
207 { "balance-tlb", BOND_MODE_TLB},
208 { "balance-alb", BOND_MODE_ALB},
212 const struct bond_parm_tbl xmit_hashtype_tbl[] = {
213 { "layer2", BOND_XMIT_POLICY_LAYER2},
214 { "layer3+4", BOND_XMIT_POLICY_LAYER34},
215 { "layer2+3", BOND_XMIT_POLICY_LAYER23},
219 const struct bond_parm_tbl arp_validate_tbl[] = {
220 { "none", BOND_ARP_VALIDATE_NONE},
221 { "active", BOND_ARP_VALIDATE_ACTIVE},
222 { "backup", BOND_ARP_VALIDATE_BACKUP},
223 { "all", BOND_ARP_VALIDATE_ALL},
227 const struct bond_parm_tbl fail_over_mac_tbl[] = {
228 { "none", BOND_FOM_NONE},
229 { "active", BOND_FOM_ACTIVE},
230 { "follow", BOND_FOM_FOLLOW},
234 const struct bond_parm_tbl pri_reselect_tbl[] = {
235 { "always", BOND_PRI_RESELECT_ALWAYS},
236 { "better", BOND_PRI_RESELECT_BETTER},
237 { "failure", BOND_PRI_RESELECT_FAILURE},
241 struct bond_parm_tbl ad_select_tbl[] = {
242 { "stable", BOND_AD_STABLE},
243 { "bandwidth", BOND_AD_BANDWIDTH},
244 { "count", BOND_AD_COUNT},
248 /*-------------------------- Forward declarations ---------------------------*/
250 static int bond_init(struct net_device *bond_dev);
251 static void bond_uninit(struct net_device *bond_dev);
253 /*---------------------------- General routines -----------------------------*/
255 const char *bond_mode_name(int mode)
257 static const char *names[] = {
258 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
259 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
260 [BOND_MODE_XOR] = "load balancing (xor)",
261 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
262 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
263 [BOND_MODE_TLB] = "transmit load balancing",
264 [BOND_MODE_ALB] = "adaptive load balancing",
267 if (mode < 0 || mode > BOND_MODE_ALB)
273 /*---------------------------------- VLAN -----------------------------------*/
276 * bond_add_vlan - add a new vlan id on bond
277 * @bond: bond that got the notification
278 * @vlan_id: the vlan id to add
280 * Returns -ENOMEM if allocation failed.
282 static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
284 struct vlan_entry *vlan;
286 pr_debug("bond: %s, vlan id %d\n",
287 (bond ? bond->dev->name : "None"), vlan_id);
289 vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
293 INIT_LIST_HEAD(&vlan->vlan_list);
294 vlan->vlan_id = vlan_id;
296 write_lock_bh(&bond->lock);
298 list_add_tail(&vlan->vlan_list, &bond->vlan_list);
300 write_unlock_bh(&bond->lock);
302 pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);
308 * bond_del_vlan - delete a vlan id from bond
309 * @bond: bond that got the notification
310 * @vlan_id: the vlan id to delete
312 * returns -ENODEV if @vlan_id was not found in @bond.
314 static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
316 struct vlan_entry *vlan;
319 pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);
322 write_lock_bh(&bond->lock);
324 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
325 if (vlan->vlan_id == vlan_id) {
326 list_del(&vlan->vlan_list);
328 if (bond_is_lb(bond))
329 bond_alb_clear_vlan(bond, vlan_id);
331 pr_debug("removed VLAN ID %d from bond %s\n",
332 vlan_id, bond->dev->name);
341 pr_debug("couldn't find VLAN ID %d in bond %s\n",
342 vlan_id, bond->dev->name);
345 write_unlock_bh(&bond->lock);
346 unblock_netpoll_tx();
351 * bond_next_vlan - safely skip to the next item in the vlans list.
352 * @bond: the bond we're working on
353 * @curr: item we're advancing from
355 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
356 * or @curr->next otherwise (even if it is @curr itself again).
358 * Caller must hold bond->lock
360 struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
362 struct vlan_entry *next, *last;
364 if (list_empty(&bond->vlan_list))
368 next = list_entry(bond->vlan_list.next,
369 struct vlan_entry, vlan_list);
371 last = list_entry(bond->vlan_list.prev,
372 struct vlan_entry, vlan_list);
374 next = list_entry(bond->vlan_list.next,
375 struct vlan_entry, vlan_list);
377 next = list_entry(curr->vlan_list.next,
378 struct vlan_entry, vlan_list);
385 #define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))
388 * bond_dev_queue_xmit - Prepare skb for xmit.
390 * @bond: bond device that got this skb for tx.
391 * @skb: hw accel VLAN tagged skb to transmit
392 * @slave_dev: slave that is supposed to xmit this skbuff
394 int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
395 struct net_device *slave_dev)
397 skb->dev = slave_dev;
399 skb->queue_mapping = bond_queue_mapping(skb);
401 if (unlikely(netpoll_tx_running(slave_dev)))
402 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
410 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
411 * We don't protect the slave list iteration with a lock because:
412 * a. This operation is performed in IOCTL context,
413 * b. The operation is protected by the RTNL semaphore in the 8021q code,
414 * c. Holding a lock with BH disabled while directly calling a base driver
415 * entry point is generally a BAD idea.
417 * The design of synchronization/protection for this operation in the 8021q
418 * module is good for one or more VLAN devices over a single physical device
419 * and cannot be extended for a teaming solution like bonding, so there is a
420 * potential race condition here where a net device from the vlan group might
421 * be referenced (either by a base driver or the 8021q code) while it is being
422 * removed from the system. However, it turns out we're not making matters
423 * worse, and if it works for regular VLAN usage it will work here too.
427 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
428 * @bond_dev: bonding net device that got called
429 * @vid: vlan id being added
431 static void bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
433 struct bonding *bond = netdev_priv(bond_dev);
437 bond_for_each_slave(bond, slave, i) {
438 struct net_device *slave_dev = slave->dev;
439 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
441 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
442 slave_ops->ndo_vlan_rx_add_vid) {
443 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vid);
447 res = bond_add_vlan(bond, vid);
449 pr_err("%s: Error: Failed to add vlan id %d\n",
450 bond_dev->name, vid);
455 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
456 * @bond_dev: bonding net device that got called
457 * @vid: vlan id being removed
459 static void bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
461 struct bonding *bond = netdev_priv(bond_dev);
465 bond_for_each_slave(bond, slave, i) {
466 struct net_device *slave_dev = slave->dev;
467 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
469 if ((slave_dev->features & NETIF_F_HW_VLAN_FILTER) &&
470 slave_ops->ndo_vlan_rx_kill_vid) {
471 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vid);
475 res = bond_del_vlan(bond, vid);
477 pr_err("%s: Error: Failed to remove vlan id %d\n",
478 bond_dev->name, vid);
482 static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
484 struct vlan_entry *vlan;
485 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
487 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
488 !(slave_ops->ndo_vlan_rx_add_vid))
491 list_for_each_entry(vlan, &bond->vlan_list, vlan_list)
492 slave_ops->ndo_vlan_rx_add_vid(slave_dev, vlan->vlan_id);
495 static void bond_del_vlans_from_slave(struct bonding *bond,
496 struct net_device *slave_dev)
498 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
499 struct vlan_entry *vlan;
501 if (!(slave_dev->features & NETIF_F_HW_VLAN_FILTER) ||
502 !(slave_ops->ndo_vlan_rx_kill_vid))
505 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
508 slave_ops->ndo_vlan_rx_kill_vid(slave_dev, vlan->vlan_id);
512 /*------------------------------- Link status -------------------------------*/
515 * Set the carrier state for the master according to the state of its
516 * slaves. If any slaves are up, the master is up. In 802.3ad mode,
517 * do special 802.3ad magic.
519 * Returns zero if carrier state does not change, nonzero if it does.
521 static int bond_set_carrier(struct bonding *bond)
526 if (bond->slave_cnt == 0)
529 if (bond->params.mode == BOND_MODE_8023AD)
530 return bond_3ad_set_carrier(bond);
532 bond_for_each_slave(bond, slave, i) {
533 if (slave->link == BOND_LINK_UP) {
534 if (!netif_carrier_ok(bond->dev)) {
535 netif_carrier_on(bond->dev);
543 if (netif_carrier_ok(bond->dev)) {
544 netif_carrier_off(bond->dev);
551 * Get link speed and duplex from the slave's base driver
552 * using ethtool. If for some reason the call fails or the
553 * values are invalid, fake speed and duplex to 100/Full
556 static int bond_update_speed_duplex(struct slave *slave)
558 struct net_device *slave_dev = slave->dev;
559 struct ethtool_cmd ecmd;
563 /* Fake speed and duplex */
564 slave->speed = SPEED_100;
565 slave->duplex = DUPLEX_FULL;
567 res = __ethtool_get_settings(slave_dev, &ecmd);
571 slave_speed = ethtool_cmd_speed(&ecmd);
572 if (slave_speed == 0 || slave_speed == ((__u32) -1))
575 switch (ecmd.duplex) {
583 slave->speed = slave_speed;
584 slave->duplex = ecmd.duplex;
590 * if <dev> supports MII link status reporting, check its link status.
592 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
593 * depending upon the setting of the use_carrier parameter.
595 * Return either BMSR_LSTATUS, meaning that the link is up (or we
596 * can't tell and just pretend it is), or 0, meaning that the link is
599 * If reporting is non-zero, instead of faking link up, return -1 if
600 * both ETHTOOL and MII ioctls fail (meaning the device does not
601 * support them). If use_carrier is set, return whatever it says.
602 * It'd be nice if there was a good way to tell if a driver supports
603 * netif_carrier, but there really isn't.
605 static int bond_check_dev_link(struct bonding *bond,
606 struct net_device *slave_dev, int reporting)
608 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
609 int (*ioctl)(struct net_device *, struct ifreq *, int);
611 struct mii_ioctl_data *mii;
613 if (!reporting && !netif_running(slave_dev))
616 if (bond->params.use_carrier)
617 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
619 /* Try to get link status using Ethtool first. */
620 if (slave_dev->ethtool_ops) {
621 if (slave_dev->ethtool_ops->get_link) {
624 link = slave_dev->ethtool_ops->get_link(slave_dev);
626 return link ? BMSR_LSTATUS : 0;
630 /* Ethtool can't be used, fallback to MII ioctls. */
631 ioctl = slave_ops->ndo_do_ioctl;
633 /* TODO: set pointer to correct ioctl on a per team member */
634 /* bases to make this more efficient. that is, once */
635 /* we determine the correct ioctl, we will always */
636 /* call it and not the others for that team */
640 * We cannot assume that SIOCGMIIPHY will also read a
641 * register; not all network drivers (e.g., e100)
645 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
646 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
648 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
649 mii->reg_num = MII_BMSR;
650 if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
651 return mii->val_out & BMSR_LSTATUS;
656 * If reporting, report that either there's no dev->do_ioctl,
657 * or both SIOCGMIIREG and get_link failed (meaning that we
658 * cannot report link status). If not reporting, pretend
661 return reporting ? -1 : BMSR_LSTATUS;
664 /*----------------------------- Multicast list ------------------------------*/
667 * Push the promiscuity flag down to appropriate slaves
669 static int bond_set_promiscuity(struct bonding *bond, int inc)
672 if (USES_PRIMARY(bond->params.mode)) {
673 /* write lock already acquired */
674 if (bond->curr_active_slave) {
675 err = dev_set_promiscuity(bond->curr_active_slave->dev,
681 bond_for_each_slave(bond, slave, i) {
682 err = dev_set_promiscuity(slave->dev, inc);
691 * Push the allmulti flag down to all slaves
693 static int bond_set_allmulti(struct bonding *bond, int inc)
696 if (USES_PRIMARY(bond->params.mode)) {
697 /* write lock already acquired */
698 if (bond->curr_active_slave) {
699 err = dev_set_allmulti(bond->curr_active_slave->dev,
705 bond_for_each_slave(bond, slave, i) {
706 err = dev_set_allmulti(slave->dev, inc);
715 * Add a Multicast address to slaves
718 static void bond_mc_add(struct bonding *bond, void *addr)
720 if (USES_PRIMARY(bond->params.mode)) {
721 /* write lock already acquired */
722 if (bond->curr_active_slave)
723 dev_mc_add(bond->curr_active_slave->dev, addr);
728 bond_for_each_slave(bond, slave, i)
729 dev_mc_add(slave->dev, addr);
734 * Remove a multicast address from slave
737 static void bond_mc_del(struct bonding *bond, void *addr)
739 if (USES_PRIMARY(bond->params.mode)) {
740 /* write lock already acquired */
741 if (bond->curr_active_slave)
742 dev_mc_del(bond->curr_active_slave->dev, addr);
746 bond_for_each_slave(bond, slave, i) {
747 dev_mc_del(slave->dev, addr);
753 static void __bond_resend_igmp_join_requests(struct net_device *dev)
755 struct in_device *in_dev;
758 in_dev = __in_dev_get_rcu(dev);
760 ip_mc_rejoin_groups(in_dev);
765 * Retrieve the list of registered multicast addresses for the bonding
766 * device and retransmit an IGMP JOIN request to the current active
769 static void bond_resend_igmp_join_requests(struct bonding *bond)
771 struct net_device *vlan_dev;
772 struct vlan_entry *vlan;
774 read_lock(&bond->lock);
776 /* rejoin all groups on bond device */
777 __bond_resend_igmp_join_requests(bond->dev);
779 /* rejoin all groups on vlan devices */
780 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
782 vlan_dev = __vlan_find_dev_deep(bond->dev,
786 __bond_resend_igmp_join_requests(vlan_dev);
789 if (--bond->igmp_retrans > 0)
790 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
792 read_unlock(&bond->lock);
795 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
797 struct bonding *bond = container_of(work, struct bonding,
799 bond_resend_igmp_join_requests(bond);
803 * flush all members of flush->mc_list from device dev->mc_list
805 static void bond_mc_list_flush(struct net_device *bond_dev,
806 struct net_device *slave_dev)
808 struct bonding *bond = netdev_priv(bond_dev);
809 struct netdev_hw_addr *ha;
811 netdev_for_each_mc_addr(ha, bond_dev)
812 dev_mc_del(slave_dev, ha->addr);
814 if (bond->params.mode == BOND_MODE_8023AD) {
815 /* del lacpdu mc addr from mc list */
816 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
818 dev_mc_del(slave_dev, lacpdu_multicast);
822 /*--------------------------- Active slave change ---------------------------*/
825 * Update the mc list and multicast-related flags for the new and
826 * old active slaves (if any) according to the multicast mode, and
827 * promiscuous flags unconditionally.
829 static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
830 struct slave *old_active)
832 struct netdev_hw_addr *ha;
834 if (!USES_PRIMARY(bond->params.mode))
835 /* nothing to do - mc list is already up-to-date on
841 if (bond->dev->flags & IFF_PROMISC)
842 dev_set_promiscuity(old_active->dev, -1);
844 if (bond->dev->flags & IFF_ALLMULTI)
845 dev_set_allmulti(old_active->dev, -1);
847 netdev_for_each_mc_addr(ha, bond->dev)
848 dev_mc_del(old_active->dev, ha->addr);
852 /* FIXME: Signal errors upstream. */
853 if (bond->dev->flags & IFF_PROMISC)
854 dev_set_promiscuity(new_active->dev, 1);
856 if (bond->dev->flags & IFF_ALLMULTI)
857 dev_set_allmulti(new_active->dev, 1);
859 netdev_for_each_mc_addr(ha, bond->dev)
860 dev_mc_add(new_active->dev, ha->addr);
865 * bond_do_fail_over_mac
867 * Perform special MAC address swapping for fail_over_mac settings
869 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
871 static void bond_do_fail_over_mac(struct bonding *bond,
872 struct slave *new_active,
873 struct slave *old_active)
874 __releases(&bond->curr_slave_lock)
875 __releases(&bond->lock)
876 __acquires(&bond->lock)
877 __acquires(&bond->curr_slave_lock)
879 u8 tmp_mac[ETH_ALEN];
880 struct sockaddr saddr;
883 switch (bond->params.fail_over_mac) {
884 case BOND_FOM_ACTIVE:
886 memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
887 new_active->dev->addr_len);
889 case BOND_FOM_FOLLOW:
891 * if new_active && old_active, swap them
892 * if just old_active, do nothing (going to no active slave)
893 * if just new_active, set new_active to bond's MAC
898 write_unlock_bh(&bond->curr_slave_lock);
899 read_unlock(&bond->lock);
902 memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
903 memcpy(saddr.sa_data, old_active->dev->dev_addr,
905 saddr.sa_family = new_active->dev->type;
907 memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
908 saddr.sa_family = bond->dev->type;
911 rv = dev_set_mac_address(new_active->dev, &saddr);
913 pr_err("%s: Error %d setting MAC of slave %s\n",
914 bond->dev->name, -rv, new_active->dev->name);
921 memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
922 saddr.sa_family = old_active->dev->type;
924 rv = dev_set_mac_address(old_active->dev, &saddr);
926 pr_err("%s: Error %d setting MAC of slave %s\n",
927 bond->dev->name, -rv, new_active->dev->name);
929 read_lock(&bond->lock);
930 write_lock_bh(&bond->curr_slave_lock);
933 pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
934 bond->dev->name, bond->params.fail_over_mac);
940 static bool bond_should_change_active(struct bonding *bond)
942 struct slave *prim = bond->primary_slave;
943 struct slave *curr = bond->curr_active_slave;
945 if (!prim || !curr || curr->link != BOND_LINK_UP)
947 if (bond->force_primary) {
948 bond->force_primary = false;
951 if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
952 (prim->speed < curr->speed ||
953 (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
955 if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
961 * find_best_interface - select the best available slave to be the active one
962 * @bond: our bonding struct
964 * Warning: Caller must hold curr_slave_lock for writing.
966 static struct slave *bond_find_best_slave(struct bonding *bond)
968 struct slave *new_active, *old_active;
969 struct slave *bestslave = NULL;
970 int mintime = bond->params.updelay;
973 new_active = bond->curr_active_slave;
975 if (!new_active) { /* there were no active slaves left */
976 if (bond->slave_cnt > 0) /* found one slave */
977 new_active = bond->first_slave;
979 return NULL; /* still no slave, return NULL */
982 if ((bond->primary_slave) &&
983 bond->primary_slave->link == BOND_LINK_UP &&
984 bond_should_change_active(bond)) {
985 new_active = bond->primary_slave;
988 /* remember where to stop iterating over the slaves */
989 old_active = new_active;
991 bond_for_each_slave_from(bond, new_active, i, old_active) {
992 if (new_active->link == BOND_LINK_UP) {
994 } else if (new_active->link == BOND_LINK_BACK &&
995 IS_UP(new_active->dev)) {
996 /* link up, but waiting for stabilization */
997 if (new_active->delay < mintime) {
998 mintime = new_active->delay;
999 bestslave = new_active;
1007 static bool bond_should_notify_peers(struct bonding *bond)
1009 struct slave *slave = bond->curr_active_slave;
1011 pr_debug("bond_should_notify_peers: bond %s slave %s\n",
1012 bond->dev->name, slave ? slave->dev->name : "NULL");
1014 if (!slave || !bond->send_peer_notif ||
1015 test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
1018 bond->send_peer_notif--;
1023 * change_active_interface - change the active slave into the specified one
1024 * @bond: our bonding struct
1025 * @new: the new slave to make the active one
1027 * Set the new slave to the bond's settings and unset them on the old
1028 * curr_active_slave.
1029 * Setting include flags, mc-list, promiscuity, allmulti, etc.
1031 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
1032 * because it is apparently the best available slave we have, even though its
1033 * updelay hasn't timed out yet.
1035 * If new_active is not NULL, caller must hold bond->lock for read and
1036 * curr_slave_lock for write_bh.
1038 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
1040 struct slave *old_active = bond->curr_active_slave;
1042 if (old_active == new_active)
1046 new_active->jiffies = jiffies;
1048 if (new_active->link == BOND_LINK_BACK) {
1049 if (USES_PRIMARY(bond->params.mode)) {
1050 pr_info("%s: making interface %s the new active one %d ms earlier.\n",
1051 bond->dev->name, new_active->dev->name,
1052 (bond->params.updelay - new_active->delay) * bond->params.miimon);
1055 new_active->delay = 0;
1056 new_active->link = BOND_LINK_UP;
1058 if (bond->params.mode == BOND_MODE_8023AD)
1059 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
1061 if (bond_is_lb(bond))
1062 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
1064 if (USES_PRIMARY(bond->params.mode)) {
1065 pr_info("%s: making interface %s the new active one.\n",
1066 bond->dev->name, new_active->dev->name);
1071 if (USES_PRIMARY(bond->params.mode))
1072 bond_mc_swap(bond, new_active, old_active);
1074 if (bond_is_lb(bond)) {
1075 bond_alb_handle_active_change(bond, new_active);
1077 bond_set_slave_inactive_flags(old_active);
1079 bond_set_slave_active_flags(new_active);
1081 bond->curr_active_slave = new_active;
1084 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
1086 bond_set_slave_inactive_flags(old_active);
1089 bool should_notify_peers = false;
1091 bond_set_slave_active_flags(new_active);
1093 if (bond->params.fail_over_mac)
1094 bond_do_fail_over_mac(bond, new_active,
1097 if (netif_running(bond->dev)) {
1098 bond->send_peer_notif =
1099 bond->params.num_peer_notif;
1100 should_notify_peers =
1101 bond_should_notify_peers(bond);
1104 write_unlock_bh(&bond->curr_slave_lock);
1105 read_unlock(&bond->lock);
1107 netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
1108 if (should_notify_peers)
1109 netdev_bonding_change(bond->dev,
1110 NETDEV_NOTIFY_PEERS);
1112 read_lock(&bond->lock);
1113 write_lock_bh(&bond->curr_slave_lock);
1117 /* resend IGMP joins since active slave has changed or
1118 * all were sent on curr_active_slave.
1119 * resend only if bond is brought up with the affected
1120 * bonding modes and the retransmission is enabled */
1121 if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
1122 ((USES_PRIMARY(bond->params.mode) && new_active) ||
1123 bond->params.mode == BOND_MODE_ROUNDROBIN)) {
1124 bond->igmp_retrans = bond->params.resend_igmp;
1125 queue_delayed_work(bond->wq, &bond->mcast_work, 0);
1130 * bond_select_active_slave - select a new active slave, if needed
1131 * @bond: our bonding struct
1133 * This functions should be called when one of the following occurs:
1134 * - The old curr_active_slave has been released or lost its link.
1135 * - The primary_slave has got its link back.
1136 * - A slave has got its link back and there's no old curr_active_slave.
1138 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
1140 void bond_select_active_slave(struct bonding *bond)
1142 struct slave *best_slave;
1145 best_slave = bond_find_best_slave(bond);
1146 if (best_slave != bond->curr_active_slave) {
1147 bond_change_active_slave(bond, best_slave);
1148 rv = bond_set_carrier(bond);
1152 if (netif_carrier_ok(bond->dev)) {
1153 pr_info("%s: first active interface up!\n",
1156 pr_info("%s: now running without any active interface !\n",
1162 /*--------------------------- slave list handling ---------------------------*/
1165 * This function attaches the slave to the end of list.
1167 * bond->lock held for writing by caller.
1169 static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
1171 if (bond->first_slave == NULL) { /* attaching the first slave */
1172 new_slave->next = new_slave;
1173 new_slave->prev = new_slave;
1174 bond->first_slave = new_slave;
1176 new_slave->next = bond->first_slave;
1177 new_slave->prev = bond->first_slave->prev;
1178 new_slave->next->prev = new_slave;
1179 new_slave->prev->next = new_slave;
1186 * This function detaches the slave from the list.
1187 * WARNING: no check is made to verify if the slave effectively
1188 * belongs to <bond>.
1189 * Nothing is freed on return, structures are just unchained.
1190 * If any slave pointer in bond was pointing to <slave>,
1191 * it should be changed by the calling function.
1193 * bond->lock held for writing by caller.
1195 static void bond_detach_slave(struct bonding *bond, struct slave *slave)
1198 slave->next->prev = slave->prev;
1201 slave->prev->next = slave->next;
1203 if (bond->first_slave == slave) { /* slave is the first slave */
1204 if (bond->slave_cnt > 1) { /* there are more slave */
1205 bond->first_slave = slave->next;
1207 bond->first_slave = NULL; /* slave was the last one */
1216 #ifdef CONFIG_NET_POLL_CONTROLLER
1217 static inline int slave_enable_netpoll(struct slave *slave)
1222 np = kzalloc(sizeof(*np), GFP_KERNEL);
1227 np->dev = slave->dev;
1228 strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
1229 err = __netpoll_setup(np);
1238 static inline void slave_disable_netpoll(struct slave *slave)
1240 struct netpoll *np = slave->np;
1246 synchronize_rcu_bh();
1247 __netpoll_cleanup(np);
1250 static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
1252 if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
1254 if (!slave_dev->netdev_ops->ndo_poll_controller)
1259 static void bond_poll_controller(struct net_device *bond_dev)
1263 static void __bond_netpoll_cleanup(struct bonding *bond)
1265 struct slave *slave;
1268 bond_for_each_slave(bond, slave, i)
1269 if (IS_UP(slave->dev))
1270 slave_disable_netpoll(slave);
1272 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1274 struct bonding *bond = netdev_priv(bond_dev);
1276 read_lock(&bond->lock);
1277 __bond_netpoll_cleanup(bond);
1278 read_unlock(&bond->lock);
1281 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
1283 struct bonding *bond = netdev_priv(dev);
1284 struct slave *slave;
1287 read_lock(&bond->lock);
1288 bond_for_each_slave(bond, slave, i) {
1289 err = slave_enable_netpoll(slave);
1291 __bond_netpoll_cleanup(bond);
1295 read_unlock(&bond->lock);
1299 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
1301 return bond->dev->npinfo;
1305 static inline int slave_enable_netpoll(struct slave *slave)
1309 static inline void slave_disable_netpoll(struct slave *slave)
1312 static void bond_netpoll_cleanup(struct net_device *bond_dev)
1317 /*---------------------------------- IOCTL ----------------------------------*/
1319 static int bond_sethwaddr(struct net_device *bond_dev,
1320 struct net_device *slave_dev)
1322 pr_debug("bond_dev=%p\n", bond_dev);
1323 pr_debug("slave_dev=%p\n", slave_dev);
1324 pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
1325 memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
1329 static u32 bond_fix_features(struct net_device *dev, u32 features)
1331 struct slave *slave;
1332 struct bonding *bond = netdev_priv(dev);
1336 read_lock(&bond->lock);
1338 if (!bond->first_slave) {
1339 /* Disable adding VLANs to empty bond. But why? --mq */
1340 features |= NETIF_F_VLAN_CHALLENGED;
1345 features &= ~NETIF_F_ONE_FOR_ALL;
1346 features |= NETIF_F_ALL_FOR_ALL;
1348 bond_for_each_slave(bond, slave, i) {
1349 features = netdev_increment_features(features,
1350 slave->dev->features,
1355 read_unlock(&bond->lock);
1359 #define BOND_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1360 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1361 NETIF_F_HIGHDMA | NETIF_F_LRO)
1363 static void bond_compute_features(struct bonding *bond)
1365 struct slave *slave;
1366 struct net_device *bond_dev = bond->dev;
1367 u32 vlan_features = BOND_VLAN_FEATURES;
1368 unsigned short max_hard_header_len = ETH_HLEN;
1371 read_lock(&bond->lock);
1373 if (!bond->first_slave)
1376 bond_for_each_slave(bond, slave, i) {
1377 vlan_features = netdev_increment_features(vlan_features,
1378 slave->dev->vlan_features, BOND_VLAN_FEATURES);
1380 if (slave->dev->hard_header_len > max_hard_header_len)
1381 max_hard_header_len = slave->dev->hard_header_len;
1385 bond_dev->vlan_features = vlan_features;
1386 bond_dev->hard_header_len = max_hard_header_len;
1388 read_unlock(&bond->lock);
1390 netdev_change_features(bond_dev);
1393 static void bond_setup_by_slave(struct net_device *bond_dev,
1394 struct net_device *slave_dev)
1396 struct bonding *bond = netdev_priv(bond_dev);
1398 bond_dev->header_ops = slave_dev->header_ops;
1400 bond_dev->type = slave_dev->type;
1401 bond_dev->hard_header_len = slave_dev->hard_header_len;
1402 bond_dev->addr_len = slave_dev->addr_len;
1404 memcpy(bond_dev->broadcast, slave_dev->broadcast,
1405 slave_dev->addr_len);
1406 bond->setup_by_slave = 1;
1409 /* On bonding slaves other than the currently active slave, suppress
1410 * duplicates except for alb non-mcast/bcast.
1412 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1413 struct slave *slave,
1414 struct bonding *bond)
1416 if (bond_is_slave_inactive(slave)) {
1417 if (bond->params.mode == BOND_MODE_ALB &&
1418 skb->pkt_type != PACKET_BROADCAST &&
1419 skb->pkt_type != PACKET_MULTICAST)
1426 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1428 struct sk_buff *skb = *pskb;
1429 struct slave *slave;
1430 struct bonding *bond;
1431 void (*recv_probe)(struct sk_buff *, struct bonding *,
1434 skb = skb_share_check(skb, GFP_ATOMIC);
1436 return RX_HANDLER_CONSUMED;
1440 slave = bond_slave_get_rcu(skb->dev);
1443 if (bond->params.arp_interval)
1444 slave->dev->last_rx = jiffies;
1446 recv_probe = ACCESS_ONCE(bond->recv_probe);
1448 struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
1451 recv_probe(nskb, bond, slave);
1452 dev_kfree_skb(nskb);
1456 if (bond_should_deliver_exact_match(skb, slave, bond)) {
1457 return RX_HANDLER_EXACT;
1460 skb->dev = bond->dev;
1462 if (bond->params.mode == BOND_MODE_ALB &&
1463 bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1464 skb->pkt_type == PACKET_HOST) {
1466 if (unlikely(skb_cow_head(skb,
1467 skb->data - skb_mac_header(skb)))) {
1469 return RX_HANDLER_CONSUMED;
1471 memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
1474 return RX_HANDLER_ANOTHER;
1477 /* enslave device <slave> to bond device <master> */
1478 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1480 struct bonding *bond = netdev_priv(bond_dev);
1481 const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1482 struct slave *new_slave = NULL;
1483 struct netdev_hw_addr *ha;
1484 struct sockaddr addr;
1488 if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
1489 slave_ops->ndo_do_ioctl == NULL) {
1490 pr_warning("%s: Warning: no link monitoring support for %s\n",
1491 bond_dev->name, slave_dev->name);
1494 /* already enslaved */
1495 if (slave_dev->flags & IFF_SLAVE) {
1496 pr_debug("Error, Device was already enslaved\n");
1500 /* vlan challenged mutual exclusion */
1501 /* no need to lock since we're protected by rtnl_lock */
1502 if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1503 pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1504 if (bond_vlan_used(bond)) {
1505 pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1506 bond_dev->name, slave_dev->name, bond_dev->name);
1509 pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1510 bond_dev->name, slave_dev->name,
1511 slave_dev->name, bond_dev->name);
1514 pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
1518 * Old ifenslave binaries are no longer supported. These can
1519 * be identified with moderate accuracy by the state of the slave:
1520 * the current ifenslave will set the interface down prior to
1521 * enslaving it; the old ifenslave will not.
1523 if ((slave_dev->flags & IFF_UP)) {
1524 pr_err("%s is up. This may be due to an out of date ifenslave.\n",
1527 goto err_undo_flags;
1530 /* set bonding device ether type by slave - bonding netdevices are
1531 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1532 * there is a need to override some of the type dependent attribs/funcs.
1534 * bond ether type mutual exclusion - don't allow slaves of dissimilar
1535 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1537 if (bond->slave_cnt == 0) {
1538 if (bond_dev->type != slave_dev->type) {
1539 pr_debug("%s: change device type from %d to %d\n",
1541 bond_dev->type, slave_dev->type);
1543 res = netdev_bonding_change(bond_dev,
1544 NETDEV_PRE_TYPE_CHANGE);
1545 res = notifier_to_errno(res);
1547 pr_err("%s: refused to change device type\n",
1550 goto err_undo_flags;
1553 /* Flush unicast and multicast addresses */
1554 dev_uc_flush(bond_dev);
1555 dev_mc_flush(bond_dev);
1557 if (slave_dev->type != ARPHRD_ETHER)
1558 bond_setup_by_slave(bond_dev, slave_dev);
1560 ether_setup(bond_dev);
1561 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1564 netdev_bonding_change(bond_dev,
1565 NETDEV_POST_TYPE_CHANGE);
1567 } else if (bond_dev->type != slave_dev->type) {
1568 pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
1570 slave_dev->type, bond_dev->type);
1572 goto err_undo_flags;
1575 if (slave_ops->ndo_set_mac_address == NULL) {
1576 if (bond->slave_cnt == 0) {
1577 pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
1579 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1580 } else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1581 pr_err("%s: Error: The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active.\n",
1584 goto err_undo_flags;
1588 call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1590 /* If this is the first slave, then we need to set the master's hardware
1591 * address to be the same as the slave's. */
1592 if (is_zero_ether_addr(bond->dev->dev_addr))
1593 memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
1594 slave_dev->addr_len);
1597 new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1600 goto err_undo_flags;
1604 * Set the new_slave's queue_id to be zero. Queue ID mapping
1605 * is set via sysfs or module option if desired.
1607 new_slave->queue_id = 0;
1609 /* Save slave's original mtu and then set it to match the bond */
1610 new_slave->original_mtu = slave_dev->mtu;
1611 res = dev_set_mtu(slave_dev, bond->dev->mtu);
1613 pr_debug("Error %d calling dev_set_mtu\n", res);
1618 * Save slave's original ("permanent") mac address for modes
1619 * that need it, and for restoring it upon release, and then
1620 * set it to the master's address
1622 memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
1624 if (!bond->params.fail_over_mac) {
1626 * Set slave to master's mac address. The application already
1627 * set the master's mac address to that of the first slave
1629 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1630 addr.sa_family = slave_dev->type;
1631 res = dev_set_mac_address(slave_dev, &addr);
1633 pr_debug("Error %d calling set_mac_address\n", res);
1634 goto err_restore_mtu;
1638 res = netdev_set_bond_master(slave_dev, bond_dev);
1640 pr_debug("Error %d calling netdev_set_bond_master\n", res);
1641 goto err_restore_mac;
1644 /* open the slave since the application closed it */
1645 res = dev_open(slave_dev);
1647 pr_debug("Opening slave %s failed\n", slave_dev->name);
1648 goto err_unset_master;
1651 new_slave->bond = bond;
1652 new_slave->dev = slave_dev;
1653 slave_dev->priv_flags |= IFF_BONDING;
1655 if (bond_is_lb(bond)) {
1656 /* bond_alb_init_slave() must be called before all other stages since
1657 * it might fail and we do not want to have to undo everything
1659 res = bond_alb_init_slave(bond, new_slave);
1664 /* If the mode USES_PRIMARY, then the new slave gets the
1665 * master's promisc (and mc) settings only if it becomes the
1666 * curr_active_slave, and that is taken care of later when calling
1667 * bond_change_active()
1669 if (!USES_PRIMARY(bond->params.mode)) {
1670 /* set promiscuity level to new slave */
1671 if (bond_dev->flags & IFF_PROMISC) {
1672 res = dev_set_promiscuity(slave_dev, 1);
1677 /* set allmulti level to new slave */
1678 if (bond_dev->flags & IFF_ALLMULTI) {
1679 res = dev_set_allmulti(slave_dev, 1);
1684 netif_addr_lock_bh(bond_dev);
1685 /* upload master's mc_list to new slave */
1686 netdev_for_each_mc_addr(ha, bond_dev)
1687 dev_mc_add(slave_dev, ha->addr);
1688 netif_addr_unlock_bh(bond_dev);
1691 if (bond->params.mode == BOND_MODE_8023AD) {
1692 /* add lacpdu mc addr to mc list */
1693 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1695 dev_mc_add(slave_dev, lacpdu_multicast);
1698 bond_add_vlans_on_slave(bond, slave_dev);
1700 write_lock_bh(&bond->lock);
1702 bond_attach_slave(bond, new_slave);
1704 new_slave->delay = 0;
1705 new_slave->link_failure_count = 0;
1707 write_unlock_bh(&bond->lock);
1709 bond_compute_features(bond);
1711 read_lock(&bond->lock);
1713 new_slave->last_arp_rx = jiffies;
1715 if (bond->params.miimon && !bond->params.use_carrier) {
1716 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1718 if ((link_reporting == -1) && !bond->params.arp_interval) {
1720 * miimon is set but a bonded network driver
1721 * does not support ETHTOOL/MII and
1722 * arp_interval is not set. Note: if
1723 * use_carrier is enabled, we will never go
1724 * here (because netif_carrier is always
1725 * supported); thus, we don't need to change
1726 * the messages for netif_carrier.
1728 pr_warning("%s: Warning: MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details.\n",
1729 bond_dev->name, slave_dev->name);
1730 } else if (link_reporting == -1) {
1731 /* unable get link status using mii/ethtool */
1732 pr_warning("%s: Warning: can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface.\n",
1733 bond_dev->name, slave_dev->name);
1737 /* check for initial state */
1738 if (!bond->params.miimon ||
1739 (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS)) {
1740 if (bond->params.updelay) {
1741 pr_debug("Initial state of slave_dev is BOND_LINK_BACK\n");
1742 new_slave->link = BOND_LINK_BACK;
1743 new_slave->delay = bond->params.updelay;
1745 pr_debug("Initial state of slave_dev is BOND_LINK_UP\n");
1746 new_slave->link = BOND_LINK_UP;
1748 new_slave->jiffies = jiffies;
1750 pr_debug("Initial state of slave_dev is BOND_LINK_DOWN\n");
1751 new_slave->link = BOND_LINK_DOWN;
1754 if (bond_update_speed_duplex(new_slave) &&
1755 (new_slave->link != BOND_LINK_DOWN)) {
1756 pr_warning("%s: Warning: failed to get speed and duplex from %s, assumed to be 100Mb/sec and Full.\n",
1757 bond_dev->name, new_slave->dev->name);
1759 if (bond->params.mode == BOND_MODE_8023AD) {
1760 pr_warning("%s: Warning: Operation of 802.3ad mode requires ETHTOOL support in base driver for proper aggregator selection.\n",
1765 if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
1766 /* if there is a primary slave, remember it */
1767 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1768 bond->primary_slave = new_slave;
1769 bond->force_primary = true;
1773 write_lock_bh(&bond->curr_slave_lock);
1775 switch (bond->params.mode) {
1776 case BOND_MODE_ACTIVEBACKUP:
1777 bond_set_slave_inactive_flags(new_slave);
1778 bond_select_active_slave(bond);
1780 case BOND_MODE_8023AD:
1781 /* in 802.3ad mode, the internal mechanism
1782 * will activate the slaves in the selected
1785 bond_set_slave_inactive_flags(new_slave);
1786 /* if this is the first slave */
1787 if (bond->slave_cnt == 1) {
1788 SLAVE_AD_INFO(new_slave).id = 1;
1789 /* Initialize AD with the number of times that the AD timer is called in 1 second
1790 * can be called only after the mac address of the bond is set
1792 bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1794 SLAVE_AD_INFO(new_slave).id =
1795 SLAVE_AD_INFO(new_slave->prev).id + 1;
1798 bond_3ad_bind_slave(new_slave);
1802 bond_set_active_slave(new_slave);
1803 bond_set_slave_inactive_flags(new_slave);
1804 bond_select_active_slave(bond);
1807 pr_debug("This slave is always active in trunk mode\n");
1809 /* always active in trunk mode */
1810 bond_set_active_slave(new_slave);
1812 /* In trunking mode there is little meaning to curr_active_slave
1813 * anyway (it holds no special properties of the bond device),
1814 * so we can change it without calling change_active_interface()
1816 if (!bond->curr_active_slave)
1817 bond->curr_active_slave = new_slave;
1820 } /* switch(bond_mode) */
1822 write_unlock_bh(&bond->curr_slave_lock);
1824 bond_set_carrier(bond);
1826 #ifdef CONFIG_NET_POLL_CONTROLLER
1827 slave_dev->npinfo = bond_netpoll_info(bond);
1828 if (slave_dev->npinfo) {
1829 if (slave_enable_netpoll(new_slave)) {
1830 read_unlock(&bond->lock);
1831 pr_info("Error, %s: master_dev is using netpoll, "
1832 "but new slave device does not support netpoll.\n",
1840 read_unlock(&bond->lock);
1842 res = bond_create_slave_symlinks(bond_dev, slave_dev);
1846 res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1849 pr_debug("Error %d calling netdev_rx_handler_register\n", res);
1850 goto err_dest_symlinks;
1853 pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
1854 bond_dev->name, slave_dev->name,
1855 bond_is_active_slave(new_slave) ? "n active" : " backup",
1856 new_slave->link != BOND_LINK_DOWN ? "n up" : " down");
1858 /* enslave is successful */
1861 /* Undo stages on error */
1863 bond_destroy_slave_symlinks(bond_dev, slave_dev);
1866 dev_close(slave_dev);
1869 netdev_set_bond_master(slave_dev, NULL);
1872 if (!bond->params.fail_over_mac) {
1873 /* XXX TODO - fom follow mode needs to change master's
1874 * MAC if this slave's MAC is in use by the bond, or at
1875 * least print a warning.
1877 memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
1878 addr.sa_family = slave_dev->type;
1879 dev_set_mac_address(slave_dev, &addr);
1883 dev_set_mtu(slave_dev, new_slave->original_mtu);
1889 bond_compute_features(bond);
1895 * Try to release the slave device <slave> from the bond device <master>
1896 * It is legal to access curr_active_slave without a lock because all the function
1899 * The rules for slave state should be:
1900 * for Active/Backup:
1901 * Active stays on all backups go down
1902 * for Bonded connections:
1903 * The first up interface should be left on and all others downed.
1905 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1907 struct bonding *bond = netdev_priv(bond_dev);
1908 struct slave *slave, *oldcurrent;
1909 struct sockaddr addr;
1910 u32 old_features = bond_dev->features;
1912 /* slave is not a slave or master is not master of this slave */
1913 if (!(slave_dev->flags & IFF_SLAVE) ||
1914 (slave_dev->master != bond_dev)) {
1915 pr_err("%s: Error: cannot release %s.\n",
1916 bond_dev->name, slave_dev->name);
1921 netdev_bonding_change(bond_dev, NETDEV_RELEASE);
1922 write_lock_bh(&bond->lock);
1924 slave = bond_get_slave_by_dev(bond, slave_dev);
1926 /* not a slave of this bond */
1927 pr_info("%s: %s not enslaved\n",
1928 bond_dev->name, slave_dev->name);
1929 write_unlock_bh(&bond->lock);
1930 unblock_netpoll_tx();
1934 /* unregister rx_handler early so bond_handle_frame wouldn't be called
1935 * for this slave anymore.
1937 netdev_rx_handler_unregister(slave_dev);
1938 write_unlock_bh(&bond->lock);
1940 write_lock_bh(&bond->lock);
1942 if (!bond->params.fail_over_mac) {
1943 if (!compare_ether_addr(bond_dev->dev_addr, slave->perm_hwaddr) &&
1944 bond->slave_cnt > 1)
1945 pr_warning("%s: Warning: the permanent HWaddr of %s - %pM - is still in use by %s. Set the HWaddr of %s to a different address to avoid conflicts.\n",
1946 bond_dev->name, slave_dev->name,
1948 bond_dev->name, slave_dev->name);
1951 /* Inform AD package of unbinding of slave. */
1952 if (bond->params.mode == BOND_MODE_8023AD) {
1953 /* must be called before the slave is
1954 * detached from the list
1956 bond_3ad_unbind_slave(slave);
1959 pr_info("%s: releasing %s interface %s\n",
1961 bond_is_active_slave(slave) ? "active" : "backup",
1964 oldcurrent = bond->curr_active_slave;
1966 bond->current_arp_slave = NULL;
1968 /* release the slave from its bond */
1969 bond_detach_slave(bond, slave);
1971 if (bond->primary_slave == slave)
1972 bond->primary_slave = NULL;
1974 if (oldcurrent == slave)
1975 bond_change_active_slave(bond, NULL);
1977 if (bond_is_lb(bond)) {
1978 /* Must be called only after the slave has been
1979 * detached from the list and the curr_active_slave
1980 * has been cleared (if our_slave == old_current),
1981 * but before a new active slave is selected.
1983 write_unlock_bh(&bond->lock);
1984 bond_alb_deinit_slave(bond, slave);
1985 write_lock_bh(&bond->lock);
1988 if (oldcurrent == slave) {
1990 * Note that we hold RTNL over this sequence, so there
1991 * is no concern that another slave add/remove event
1994 write_unlock_bh(&bond->lock);
1995 read_lock(&bond->lock);
1996 write_lock_bh(&bond->curr_slave_lock);
1998 bond_select_active_slave(bond);
2000 write_unlock_bh(&bond->curr_slave_lock);
2001 read_unlock(&bond->lock);
2002 write_lock_bh(&bond->lock);
2005 if (bond->slave_cnt == 0) {
2006 bond_set_carrier(bond);
2008 /* if the last slave was removed, zero the mac address
2009 * of the master so it will be set by the application
2010 * to the mac address of the first slave
2012 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2014 if (bond_vlan_used(bond)) {
2015 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2016 bond_dev->name, bond_dev->name);
2017 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2022 write_unlock_bh(&bond->lock);
2023 unblock_netpoll_tx();
2025 bond_compute_features(bond);
2026 if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
2027 (old_features & NETIF_F_VLAN_CHALLENGED))
2028 pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
2029 bond_dev->name, slave_dev->name, bond_dev->name);
2031 /* must do this from outside any spinlocks */
2032 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2034 bond_del_vlans_from_slave(bond, slave_dev);
2036 /* If the mode USES_PRIMARY, then we should only remove its
2037 * promisc and mc settings if it was the curr_active_slave, but that was
2038 * already taken care of above when we detached the slave
2040 if (!USES_PRIMARY(bond->params.mode)) {
2041 /* unset promiscuity level from slave */
2042 if (bond_dev->flags & IFF_PROMISC)
2043 dev_set_promiscuity(slave_dev, -1);
2045 /* unset allmulti level from slave */
2046 if (bond_dev->flags & IFF_ALLMULTI)
2047 dev_set_allmulti(slave_dev, -1);
2049 /* flush master's mc_list from slave */
2050 netif_addr_lock_bh(bond_dev);
2051 bond_mc_list_flush(bond_dev, slave_dev);
2052 netif_addr_unlock_bh(bond_dev);
2055 netdev_set_bond_master(slave_dev, NULL);
2057 slave_disable_netpoll(slave);
2059 /* close slave before restoring its mac address */
2060 dev_close(slave_dev);
2062 if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
2063 /* restore original ("permanent") mac address */
2064 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2065 addr.sa_family = slave_dev->type;
2066 dev_set_mac_address(slave_dev, &addr);
2069 dev_set_mtu(slave_dev, slave->original_mtu);
2071 slave_dev->priv_flags &= ~IFF_BONDING;
2075 return 0; /* deletion OK */
2079 * First release a slave and then destroy the bond if no more slaves are left.
2080 * Must be under rtnl_lock when this function is called.
2082 static int bond_release_and_destroy(struct net_device *bond_dev,
2083 struct net_device *slave_dev)
2085 struct bonding *bond = netdev_priv(bond_dev);
2088 ret = bond_release(bond_dev, slave_dev);
2089 if ((ret == 0) && (bond->slave_cnt == 0)) {
2090 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
2091 pr_info("%s: destroying bond %s.\n",
2092 bond_dev->name, bond_dev->name);
2093 unregister_netdevice(bond_dev);
2099 * This function releases all slaves.
2101 static int bond_release_all(struct net_device *bond_dev)
2103 struct bonding *bond = netdev_priv(bond_dev);
2104 struct slave *slave;
2105 struct net_device *slave_dev;
2106 struct sockaddr addr;
2108 write_lock_bh(&bond->lock);
2110 netif_carrier_off(bond_dev);
2112 if (bond->slave_cnt == 0)
2115 bond->current_arp_slave = NULL;
2116 bond->primary_slave = NULL;
2117 bond_change_active_slave(bond, NULL);
2119 while ((slave = bond->first_slave) != NULL) {
2120 /* Inform AD package of unbinding of slave
2121 * before slave is detached from the list.
2123 if (bond->params.mode == BOND_MODE_8023AD)
2124 bond_3ad_unbind_slave(slave);
2126 slave_dev = slave->dev;
2127 bond_detach_slave(bond, slave);
2129 /* now that the slave is detached, unlock and perform
2130 * all the undo steps that should not be called from
2133 write_unlock_bh(&bond->lock);
2135 /* unregister rx_handler early so bond_handle_frame wouldn't
2136 * be called for this slave anymore.
2138 netdev_rx_handler_unregister(slave_dev);
2141 if (bond_is_lb(bond)) {
2142 /* must be called only after the slave
2143 * has been detached from the list
2145 bond_alb_deinit_slave(bond, slave);
2148 bond_destroy_slave_symlinks(bond_dev, slave_dev);
2149 bond_del_vlans_from_slave(bond, slave_dev);
2151 /* If the mode USES_PRIMARY, then we should only remove its
2152 * promisc and mc settings if it was the curr_active_slave, but that was
2153 * already taken care of above when we detached the slave
2155 if (!USES_PRIMARY(bond->params.mode)) {
2156 /* unset promiscuity level from slave */
2157 if (bond_dev->flags & IFF_PROMISC)
2158 dev_set_promiscuity(slave_dev, -1);
2160 /* unset allmulti level from slave */
2161 if (bond_dev->flags & IFF_ALLMULTI)
2162 dev_set_allmulti(slave_dev, -1);
2164 /* flush master's mc_list from slave */
2165 netif_addr_lock_bh(bond_dev);
2166 bond_mc_list_flush(bond_dev, slave_dev);
2167 netif_addr_unlock_bh(bond_dev);
2170 netdev_set_bond_master(slave_dev, NULL);
2172 slave_disable_netpoll(slave);
2174 /* close slave before restoring its mac address */
2175 dev_close(slave_dev);
2177 if (!bond->params.fail_over_mac) {
2178 /* restore original ("permanent") mac address*/
2179 memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
2180 addr.sa_family = slave_dev->type;
2181 dev_set_mac_address(slave_dev, &addr);
2186 /* re-acquire the lock before getting the next slave */
2187 write_lock_bh(&bond->lock);
2190 /* zero the mac address of the master so it will be
2191 * set by the application to the mac address of the
2194 memset(bond_dev->dev_addr, 0, bond_dev->addr_len);
2196 if (bond_vlan_used(bond)) {
2197 pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
2198 bond_dev->name, bond_dev->name);
2199 pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
2203 pr_info("%s: released all slaves\n", bond_dev->name);
2206 write_unlock_bh(&bond->lock);
2208 bond_compute_features(bond);
2214 * This function changes the active slave to slave <slave_dev>.
2215 * It returns -EINVAL in the following cases.
2216 * - <slave_dev> is not found in the list.
2217 * - There is not active slave now.
2218 * - <slave_dev> is already active.
2219 * - The link state of <slave_dev> is not BOND_LINK_UP.
2220 * - <slave_dev> is not running.
2221 * In these cases, this function does nothing.
2222 * In the other cases, current_slave pointer is changed and 0 is returned.
2224 static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
2226 struct bonding *bond = netdev_priv(bond_dev);
2227 struct slave *old_active = NULL;
2228 struct slave *new_active = NULL;
2231 if (!USES_PRIMARY(bond->params.mode))
2234 /* Verify that master_dev is indeed the master of slave_dev */
2235 if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
2238 read_lock(&bond->lock);
2240 read_lock(&bond->curr_slave_lock);
2241 old_active = bond->curr_active_slave;
2242 read_unlock(&bond->curr_slave_lock);
2244 new_active = bond_get_slave_by_dev(bond, slave_dev);
2247 * Changing to the current active: do nothing; return success.
2249 if (new_active && (new_active == old_active)) {
2250 read_unlock(&bond->lock);
2256 (new_active->link == BOND_LINK_UP) &&
2257 IS_UP(new_active->dev)) {
2259 write_lock_bh(&bond->curr_slave_lock);
2260 bond_change_active_slave(bond, new_active);
2261 write_unlock_bh(&bond->curr_slave_lock);
2262 unblock_netpoll_tx();
2266 read_unlock(&bond->lock);
2271 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
2273 struct bonding *bond = netdev_priv(bond_dev);
2275 info->bond_mode = bond->params.mode;
2276 info->miimon = bond->params.miimon;
2278 read_lock(&bond->lock);
2279 info->num_slaves = bond->slave_cnt;
2280 read_unlock(&bond->lock);
2285 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
2287 struct bonding *bond = netdev_priv(bond_dev);
2288 struct slave *slave;
2289 int i, res = -ENODEV;
2291 read_lock(&bond->lock);
2293 bond_for_each_slave(bond, slave, i) {
2294 if (i == (int)info->slave_id) {
2296 strcpy(info->slave_name, slave->dev->name);
2297 info->link = slave->link;
2298 info->state = bond_slave_state(slave);
2299 info->link_failure_count = slave->link_failure_count;
2304 read_unlock(&bond->lock);
2309 /*-------------------------------- Monitoring -------------------------------*/
2312 static int bond_miimon_inspect(struct bonding *bond)
2314 struct slave *slave;
2315 int i, link_state, commit = 0;
2316 bool ignore_updelay;
2318 ignore_updelay = !bond->curr_active_slave ? true : false;
2320 bond_for_each_slave(bond, slave, i) {
2321 slave->new_link = BOND_LINK_NOCHANGE;
2323 link_state = bond_check_dev_link(bond, slave->dev, 0);
2325 switch (slave->link) {
2330 slave->link = BOND_LINK_FAIL;
2331 slave->delay = bond->params.downdelay;
2333 pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
2335 (bond->params.mode ==
2336 BOND_MODE_ACTIVEBACKUP) ?
2337 (bond_is_active_slave(slave) ?
2338 "active " : "backup ") : "",
2340 bond->params.downdelay * bond->params.miimon);
2343 case BOND_LINK_FAIL:
2346 * recovered before downdelay expired
2348 slave->link = BOND_LINK_UP;
2349 slave->jiffies = jiffies;
2350 pr_info("%s: link status up again after %d ms for interface %s.\n",
2352 (bond->params.downdelay - slave->delay) *
2353 bond->params.miimon,
2358 if (slave->delay <= 0) {
2359 slave->new_link = BOND_LINK_DOWN;
2367 case BOND_LINK_DOWN:
2371 slave->link = BOND_LINK_BACK;
2372 slave->delay = bond->params.updelay;
2375 pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
2376 bond->dev->name, slave->dev->name,
2377 ignore_updelay ? 0 :
2378 bond->params.updelay *
2379 bond->params.miimon);
2382 case BOND_LINK_BACK:
2384 slave->link = BOND_LINK_DOWN;
2385 pr_info("%s: link status down again after %d ms for interface %s.\n",
2387 (bond->params.updelay - slave->delay) *
2388 bond->params.miimon,
2397 if (slave->delay <= 0) {
2398 slave->new_link = BOND_LINK_UP;
2400 ignore_updelay = false;
2412 static void bond_miimon_commit(struct bonding *bond)
2414 struct slave *slave;
2417 bond_for_each_slave(bond, slave, i) {
2418 switch (slave->new_link) {
2419 case BOND_LINK_NOCHANGE:
2423 slave->link = BOND_LINK_UP;
2424 slave->jiffies = jiffies;
2426 if (bond->params.mode == BOND_MODE_8023AD) {
2427 /* prevent it from being the active one */
2428 bond_set_backup_slave(slave);
2429 } else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
2430 /* make it immediately active */
2431 bond_set_active_slave(slave);
2432 } else if (slave != bond->primary_slave) {
2433 /* prevent it from being the active one */
2434 bond_set_backup_slave(slave);
2437 bond_update_speed_duplex(slave);
2439 pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
2440 bond->dev->name, slave->dev->name,
2441 slave->speed, slave->duplex ? "full" : "half");
2443 /* notify ad that the link status has changed */
2444 if (bond->params.mode == BOND_MODE_8023AD)
2445 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2447 if (bond_is_lb(bond))
2448 bond_alb_handle_link_change(bond, slave,
2451 if (!bond->curr_active_slave ||
2452 (slave == bond->primary_slave))
2457 case BOND_LINK_DOWN:
2458 if (slave->link_failure_count < UINT_MAX)
2459 slave->link_failure_count++;
2461 slave->link = BOND_LINK_DOWN;
2463 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
2464 bond->params.mode == BOND_MODE_8023AD)
2465 bond_set_slave_inactive_flags(slave);
2467 pr_info("%s: link status definitely down for interface %s, disabling it\n",
2468 bond->dev->name, slave->dev->name);
2470 if (bond->params.mode == BOND_MODE_8023AD)
2471 bond_3ad_handle_link_change(slave,
2474 if (bond_is_lb(bond))
2475 bond_alb_handle_link_change(bond, slave,
2478 if (slave == bond->curr_active_slave)
2484 pr_err("%s: invalid new link %d on slave %s\n",
2485 bond->dev->name, slave->new_link,
2487 slave->new_link = BOND_LINK_NOCHANGE;
2495 write_lock_bh(&bond->curr_slave_lock);
2496 bond_select_active_slave(bond);
2497 write_unlock_bh(&bond->curr_slave_lock);
2498 unblock_netpoll_tx();
2501 bond_set_carrier(bond);
2507 * Really a wrapper that splits the mii monitor into two phases: an
2508 * inspection, then (if inspection indicates something needs to be done)
2509 * an acquisition of appropriate locks followed by a commit phase to
2510 * implement whatever link state changes are indicated.
2512 void bond_mii_monitor(struct work_struct *work)
2514 struct bonding *bond = container_of(work, struct bonding,
2516 bool should_notify_peers = false;
2517 unsigned long delay;
2519 read_lock(&bond->lock);
2521 delay = msecs_to_jiffies(bond->params.miimon);
2523 if (bond->slave_cnt == 0)
2526 should_notify_peers = bond_should_notify_peers(bond);
2528 if (bond_miimon_inspect(bond)) {
2529 read_unlock(&bond->lock);
2531 /* Race avoidance with bond_close cancel of workqueue */
2532 if (!rtnl_trylock()) {
2533 read_lock(&bond->lock);
2535 should_notify_peers = false;
2539 read_lock(&bond->lock);
2541 bond_miimon_commit(bond);
2543 read_unlock(&bond->lock);
2544 rtnl_unlock(); /* might sleep, hold no other locks */
2545 read_lock(&bond->lock);
2549 if (bond->params.miimon)
2550 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2552 read_unlock(&bond->lock);
2554 if (should_notify_peers) {
2555 if (!rtnl_trylock()) {
2556 read_lock(&bond->lock);
2557 bond->send_peer_notif++;
2558 read_unlock(&bond->lock);
2561 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
2566 static __be32 bond_glean_dev_ip(struct net_device *dev)
2568 struct in_device *idev;
2569 struct in_ifaddr *ifa;
2576 idev = __in_dev_get_rcu(dev);
2580 ifa = idev->ifa_list;
2584 addr = ifa->ifa_local;
2590 static int bond_has_this_ip(struct bonding *bond, __be32 ip)
2592 struct vlan_entry *vlan;
2594 if (ip == bond->master_ip)
2597 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2598 if (ip == vlan->vlan_ip)
2606 * We go to the (large) trouble of VLAN tagging ARP frames because
2607 * switches in VLAN mode (especially if ports are configured as
2608 * "native" to a VLAN) might not pass non-tagged frames.
2610 static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
2612 struct sk_buff *skb;
2614 pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
2615 slave_dev->name, dest_ip, src_ip, vlan_id);
2617 skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2618 NULL, slave_dev->dev_addr, NULL);
2621 pr_err("ARP packet allocation failed\n");
2625 skb = vlan_put_tag(skb, vlan_id);
2627 pr_err("failed to insert VLAN tag\n");
2635 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2638 __be32 *targets = bond->params.arp_targets;
2639 struct vlan_entry *vlan;
2640 struct net_device *vlan_dev;
2643 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
2646 pr_debug("basa: target %x\n", targets[i]);
2647 if (!bond_vlan_used(bond)) {
2648 pr_debug("basa: empty vlan: arp_send\n");
2649 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2650 bond->master_ip, 0);
2655 * If VLANs are configured, we do a route lookup to
2656 * determine which VLAN interface would be used, so we
2657 * can tag the ARP with the proper VLAN tag.
2659 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2662 if (net_ratelimit()) {
2663 pr_warning("%s: no route to arp_ip_target %pI4\n",
2664 bond->dev->name, &targets[i]);
2670 * This target is not on a VLAN
2672 if (rt->dst.dev == bond->dev) {
2674 pr_debug("basa: rtdev == bond->dev: arp_send\n");
2675 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2676 bond->master_ip, 0);
2681 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
2683 vlan_dev = __vlan_find_dev_deep(bond->dev,
2686 if (vlan_dev == rt->dst.dev) {
2687 vlan_id = vlan->vlan_id;
2688 pr_debug("basa: vlan match on %s %d\n",
2689 vlan_dev->name, vlan_id);
2696 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2697 vlan->vlan_ip, vlan_id);
2701 if (net_ratelimit()) {
2702 pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
2703 bond->dev->name, &targets[i],
2704 rt->dst.dev ? rt->dst.dev->name : "NULL");
2710 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2713 __be32 *targets = bond->params.arp_targets;
2715 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
2716 pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
2717 &sip, &tip, i, &targets[i],
2718 bond_has_this_ip(bond, tip));
2719 if (sip == targets[i]) {
2720 if (bond_has_this_ip(bond, tip))
2721 slave->last_arp_rx = jiffies;
2727 static void bond_arp_rcv(struct sk_buff *skb, struct bonding *bond,
2728 struct slave *slave)
2731 unsigned char *arp_ptr;
2734 if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
2737 read_lock(&bond->lock);
2739 pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
2740 bond->dev->name, skb->dev->name);
2742 if (!pskb_may_pull(skb, arp_hdr_len(bond->dev)))
2746 if (arp->ar_hln != bond->dev->addr_len ||
2747 skb->pkt_type == PACKET_OTHERHOST ||
2748 skb->pkt_type == PACKET_LOOPBACK ||
2749 arp->ar_hrd != htons(ARPHRD_ETHER) ||
2750 arp->ar_pro != htons(ETH_P_IP) ||
2754 arp_ptr = (unsigned char *)(arp + 1);
2755 arp_ptr += bond->dev->addr_len;
2756 memcpy(&sip, arp_ptr, 4);
2757 arp_ptr += 4 + bond->dev->addr_len;
2758 memcpy(&tip, arp_ptr, 4);
2760 pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2761 bond->dev->name, slave->dev->name, bond_slave_state(slave),
2762 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2766 * Backup slaves won't see the ARP reply, but do come through
2767 * here for each ARP probe (so we swap the sip/tip to validate
2768 * the probe). In a "redundant switch, common router" type of
2769 * configuration, the ARP probe will (hopefully) travel from
2770 * the active, through one switch, the router, then the other
2771 * switch before reaching the backup.
2773 if (bond_is_active_slave(slave))
2774 bond_validate_arp(bond, slave, sip, tip);
2776 bond_validate_arp(bond, slave, tip, sip);
2779 read_unlock(&bond->lock);
2783 * this function is called regularly to monitor each slave's link
2784 * ensuring that traffic is being sent and received when arp monitoring
2785 * is used in load-balancing mode. if the adapter has been dormant, then an
2786 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2787 * arp monitoring in active backup mode.
2789 void bond_loadbalance_arp_mon(struct work_struct *work)
2791 struct bonding *bond = container_of(work, struct bonding,
2793 struct slave *slave, *oldcurrent;
2794 int do_failover = 0;
2798 read_lock(&bond->lock);
2800 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2802 if (bond->slave_cnt == 0)
2805 read_lock(&bond->curr_slave_lock);
2806 oldcurrent = bond->curr_active_slave;
2807 read_unlock(&bond->curr_slave_lock);
2809 /* see if any of the previous devices are up now (i.e. they have
2810 * xmt and rcv traffic). the curr_active_slave does not come into
2811 * the picture unless it is null. also, slave->jiffies is not needed
2812 * here because we send an arp on each slave and give a slave as
2813 * long as it needs to get the tx/rx within the delta.
2814 * TODO: what about up/down delay in arp mode? it wasn't here before
2817 bond_for_each_slave(bond, slave, i) {
2818 unsigned long trans_start = dev_trans_start(slave->dev);
2820 if (slave->link != BOND_LINK_UP) {
2821 if (time_in_range(jiffies,
2822 trans_start - delta_in_ticks,
2823 trans_start + delta_in_ticks) &&
2824 time_in_range(jiffies,
2825 slave->dev->last_rx - delta_in_ticks,
2826 slave->dev->last_rx + delta_in_ticks)) {
2828 slave->link = BOND_LINK_UP;
2829 bond_set_active_slave(slave);
2831 /* primary_slave has no meaning in round-robin
2832 * mode. the window of a slave being up and
2833 * curr_active_slave being null after enslaving
2837 pr_info("%s: link status definitely up for interface %s, ",
2842 pr_info("%s: interface %s is now up\n",
2848 /* slave->link == BOND_LINK_UP */
2850 /* not all switches will respond to an arp request
2851 * when the source ip is 0, so don't take the link down
2852 * if we don't know our ip yet
2854 if (!time_in_range(jiffies,
2855 trans_start - delta_in_ticks,
2856 trans_start + 2 * delta_in_ticks) ||
2857 !time_in_range(jiffies,
2858 slave->dev->last_rx - delta_in_ticks,
2859 slave->dev->last_rx + 2 * delta_in_ticks)) {
2861 slave->link = BOND_LINK_DOWN;
2862 bond_set_backup_slave(slave);
2864 if (slave->link_failure_count < UINT_MAX)
2865 slave->link_failure_count++;
2867 pr_info("%s: interface %s is now down.\n",
2871 if (slave == oldcurrent)
2876 /* note: if switch is in round-robin mode, all links
2877 * must tx arp to ensure all links rx an arp - otherwise
2878 * links may oscillate or not come up at all; if switch is
2879 * in something like xor mode, there is nothing we can
2880 * do - all replies will be rx'ed on same link causing slaves
2881 * to be unstable during low/no traffic periods
2883 if (IS_UP(slave->dev))
2884 bond_arp_send_all(bond, slave);
2889 write_lock_bh(&bond->curr_slave_lock);
2891 bond_select_active_slave(bond);
2893 write_unlock_bh(&bond->curr_slave_lock);
2894 unblock_netpoll_tx();
2898 if (bond->params.arp_interval)
2899 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2901 read_unlock(&bond->lock);
2905 * Called to inspect slaves for active-backup mode ARP monitor link state
2906 * changes. Sets new_link in slaves to specify what action should take
2907 * place for the slave. Returns 0 if no changes are found, >0 if changes
2908 * to link states must be committed.
2910 * Called with bond->lock held for read.
2912 static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
2914 struct slave *slave;
2916 unsigned long trans_start;
2918 bond_for_each_slave(bond, slave, i) {
2919 slave->new_link = BOND_LINK_NOCHANGE;
2921 if (slave->link != BOND_LINK_UP) {
2922 if (time_in_range(jiffies,
2923 slave_last_rx(bond, slave) - delta_in_ticks,
2924 slave_last_rx(bond, slave) + delta_in_ticks)) {
2926 slave->new_link = BOND_LINK_UP;
2934 * Give slaves 2*delta after being enslaved or made
2935 * active. This avoids bouncing, as the last receive
2936 * times need a full ARP monitor cycle to be updated.
2938 if (time_in_range(jiffies,
2939 slave->jiffies - delta_in_ticks,
2940 slave->jiffies + 2 * delta_in_ticks))
2944 * Backup slave is down if:
2945 * - No current_arp_slave AND
2946 * - more than 3*delta since last receive AND
2947 * - the bond has an IP address
2949 * Note: a non-null current_arp_slave indicates
2950 * the curr_active_slave went down and we are
2951 * searching for a new one; under this condition
2952 * we only take the curr_active_slave down - this
2953 * gives each slave a chance to tx/rx traffic
2954 * before being taken out
2956 if (!bond_is_active_slave(slave) &&
2957 !bond->current_arp_slave &&
2958 !time_in_range(jiffies,
2959 slave_last_rx(bond, slave) - delta_in_ticks,
2960 slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {
2962 slave->new_link = BOND_LINK_DOWN;
2967 * Active slave is down if:
2968 * - more than 2*delta since transmitting OR
2969 * - (more than 2*delta since receive AND
2970 * the bond has an IP address)
2972 trans_start = dev_trans_start(slave->dev);
2973 if (bond_is_active_slave(slave) &&
2974 (!time_in_range(jiffies,
2975 trans_start - delta_in_ticks,
2976 trans_start + 2 * delta_in_ticks) ||
2977 !time_in_range(jiffies,
2978 slave_last_rx(bond, slave) - delta_in_ticks,
2979 slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {
2981 slave->new_link = BOND_LINK_DOWN;
2990 * Called to commit link state changes noted by inspection step of
2991 * active-backup mode ARP monitor.
2993 * Called with RTNL and bond->lock for read.
2995 static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
2997 struct slave *slave;
2999 unsigned long trans_start;
3001 bond_for_each_slave(bond, slave, i) {
3002 switch (slave->new_link) {
3003 case BOND_LINK_NOCHANGE:
3007 trans_start = dev_trans_start(slave->dev);
3008 if ((!bond->curr_active_slave &&
3009 time_in_range(jiffies,
3010 trans_start - delta_in_ticks,
3011 trans_start + delta_in_ticks)) ||
3012 bond->curr_active_slave != slave) {
3013 slave->link = BOND_LINK_UP;
3014 bond->current_arp_slave = NULL;
3016 pr_info("%s: link status definitely up for interface %s.\n",
3017 bond->dev->name, slave->dev->name);
3019 if (!bond->curr_active_slave ||
3020 (slave == bond->primary_slave))
3027 case BOND_LINK_DOWN:
3028 if (slave->link_failure_count < UINT_MAX)
3029 slave->link_failure_count++;
3031 slave->link = BOND_LINK_DOWN;
3032 bond_set_slave_inactive_flags(slave);
3034 pr_info("%s: link status definitely down for interface %s, disabling it\n",
3035 bond->dev->name, slave->dev->name);
3037 if (slave == bond->curr_active_slave) {
3038 bond->current_arp_slave = NULL;
3045 pr_err("%s: impossible: new_link %d on slave %s\n",
3046 bond->dev->name, slave->new_link,
3054 write_lock_bh(&bond->curr_slave_lock);
3055 bond_select_active_slave(bond);
3056 write_unlock_bh(&bond->curr_slave_lock);
3057 unblock_netpoll_tx();
3060 bond_set_carrier(bond);
3064 * Send ARP probes for active-backup mode ARP monitor.
3066 * Called with bond->lock held for read.
3068 static void bond_ab_arp_probe(struct bonding *bond)
3070 struct slave *slave;
3073 read_lock(&bond->curr_slave_lock);
3075 if (bond->current_arp_slave && bond->curr_active_slave)
3076 pr_info("PROBE: c_arp %s && cas %s BAD\n",
3077 bond->current_arp_slave->dev->name,
3078 bond->curr_active_slave->dev->name);
3080 if (bond->curr_active_slave) {
3081 bond_arp_send_all(bond, bond->curr_active_slave);
3082 read_unlock(&bond->curr_slave_lock);
3086 read_unlock(&bond->curr_slave_lock);
3088 /* if we don't have a curr_active_slave, search for the next available
3089 * backup slave from the current_arp_slave and make it the candidate
3090 * for becoming the curr_active_slave
3093 if (!bond->current_arp_slave) {
3094 bond->current_arp_slave = bond->first_slave;
3095 if (!bond->current_arp_slave)
3099 bond_set_slave_inactive_flags(bond->current_arp_slave);
3101 /* search for next candidate */
3102 bond_for_each_slave_from(bond, slave, i, bond->current_arp_slave->next) {
3103 if (IS_UP(slave->dev)) {
3104 slave->link = BOND_LINK_BACK;
3105 bond_set_slave_active_flags(slave);
3106 bond_arp_send_all(bond, slave);
3107 slave->jiffies = jiffies;
3108 bond->current_arp_slave = slave;
3112 /* if the link state is up at this point, we
3113 * mark it down - this can happen if we have
3114 * simultaneous link failures and
3115 * reselect_active_interface doesn't make this
3116 * one the current slave so it is still marked
3117 * up when it is actually down
3119 if (slave->link == BOND_LINK_UP) {
3120 slave->link = BOND_LINK_DOWN;
3121 if (slave->link_failure_count < UINT_MAX)
3122 slave->link_failure_count++;
3124 bond_set_slave_inactive_flags(slave);
3126 pr_info("%s: backup interface %s is now down.\n",
3127 bond->dev->name, slave->dev->name);
3132 void bond_activebackup_arp_mon(struct work_struct *work)
3134 struct bonding *bond = container_of(work, struct bonding,
3136 bool should_notify_peers = false;
3139 read_lock(&bond->lock);
3141 delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
3143 if (bond->slave_cnt == 0)
3146 should_notify_peers = bond_should_notify_peers(bond);
3148 if (bond_ab_arp_inspect(bond, delta_in_ticks)) {
3149 read_unlock(&bond->lock);
3151 /* Race avoidance with bond_close flush of workqueue */
3152 if (!rtnl_trylock()) {
3153 read_lock(&bond->lock);
3155 should_notify_peers = false;
3159 read_lock(&bond->lock);
3161 bond_ab_arp_commit(bond, delta_in_ticks);
3163 read_unlock(&bond->lock);
3165 read_lock(&bond->lock);
3168 bond_ab_arp_probe(bond);
3171 if (bond->params.arp_interval)
3172 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
3174 read_unlock(&bond->lock);
3176 if (should_notify_peers) {
3177 if (!rtnl_trylock()) {
3178 read_lock(&bond->lock);
3179 bond->send_peer_notif++;
3180 read_unlock(&bond->lock);
3183 netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
3188 /*-------------------------- netdev event handling --------------------------*/
3191 * Change device name
3193 static int bond_event_changename(struct bonding *bond)
3195 bond_remove_proc_entry(bond);
3196 bond_create_proc_entry(bond);
3198 bond_debug_reregister(bond);
3203 static int bond_master_netdev_event(unsigned long event,
3204 struct net_device *bond_dev)
3206 struct bonding *event_bond = netdev_priv(bond_dev);
3209 case NETDEV_CHANGENAME:
3210 return bond_event_changename(event_bond);
3218 static int bond_slave_netdev_event(unsigned long event,
3219 struct net_device *slave_dev)
3221 struct net_device *bond_dev = slave_dev->master;
3222 struct bonding *bond = netdev_priv(bond_dev);
3225 case NETDEV_UNREGISTER:
3227 if (bond->setup_by_slave)
3228 bond_release_and_destroy(bond_dev, slave_dev);
3230 bond_release(bond_dev, slave_dev);
3234 if (bond->params.mode == BOND_MODE_8023AD || bond_is_lb(bond)) {
3235 struct slave *slave;
3237 slave = bond_get_slave_by_dev(bond, slave_dev);
3239 u32 old_speed = slave->speed;
3240 u8 old_duplex = slave->duplex;
3242 bond_update_speed_duplex(slave);
3244 if (bond_is_lb(bond))
3247 if (old_speed != slave->speed)
3248 bond_3ad_adapter_speed_changed(slave);
3249 if (old_duplex != slave->duplex)
3250 bond_3ad_adapter_duplex_changed(slave);
3257 * ... Or is it this?
3260 case NETDEV_CHANGEMTU:
3262 * TODO: Should slaves be allowed to
3263 * independently alter their MTU? For
3264 * an active-backup bond, slaves need
3265 * not be the same type of device, so
3266 * MTUs may vary. For other modes,
3267 * slaves arguably should have the
3268 * same MTUs. To do this, we'd need to
3269 * take over the slave's change_mtu
3270 * function for the duration of their
3274 case NETDEV_CHANGENAME:
3276 * TODO: handle changing the primary's name
3279 case NETDEV_FEAT_CHANGE:
3280 bond_compute_features(bond);
3290 * bond_netdev_event: handle netdev notifier chain events.
3292 * This function receives events for the netdev chain. The caller (an
3293 * ioctl handler calling blocking_notifier_call_chain) holds the necessary
3294 * locks for us to safely manipulate the slave devices (RTNL lock,
3297 static int bond_netdev_event(struct notifier_block *this,
3298 unsigned long event, void *ptr)
3300 struct net_device *event_dev = (struct net_device *)ptr;
3302 pr_debug("event_dev: %s, event: %lx\n",
3303 event_dev ? event_dev->name : "None",
3306 if (!(event_dev->priv_flags & IFF_BONDING))
3309 if (event_dev->flags & IFF_MASTER) {
3310 pr_debug("IFF_MASTER\n");
3311 return bond_master_netdev_event(event, event_dev);
3314 if (event_dev->flags & IFF_SLAVE) {
3315 pr_debug("IFF_SLAVE\n");
3316 return bond_slave_netdev_event(event, event_dev);
3323 * bond_inetaddr_event: handle inetaddr notifier chain events.
3325 * We keep track of device IPs primarily to use as source addresses in
3326 * ARP monitor probes (rather than spewing out broadcasts all the time).
3328 * We track one IP for the main device (if it has one), plus one per VLAN.
3330 static int bond_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
3332 struct in_ifaddr *ifa = ptr;
3333 struct net_device *vlan_dev, *event_dev = ifa->ifa_dev->dev;
3334 struct bond_net *bn = net_generic(dev_net(event_dev), bond_net_id);
3335 struct bonding *bond;
3336 struct vlan_entry *vlan;
3338 list_for_each_entry(bond, &bn->dev_list, bond_list) {
3339 if (bond->dev == event_dev) {
3342 bond->master_ip = ifa->ifa_local;
3345 bond->master_ip = bond_glean_dev_ip(bond->dev);
3352 list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
3353 vlan_dev = __vlan_find_dev_deep(bond->dev,
3355 if (vlan_dev == event_dev) {
3358 vlan->vlan_ip = ifa->ifa_local;
3362 bond_glean_dev_ip(vlan_dev);
3373 static struct notifier_block bond_netdev_notifier = {
3374 .notifier_call = bond_netdev_event,
3377 static struct notifier_block bond_inetaddr_notifier = {
3378 .notifier_call = bond_inetaddr_event,
3381 /*---------------------------- Hashing Policies -----------------------------*/
3384 * Hash for the output device based upon layer 2 and layer 3 data. If
3385 * the packet is not IP mimic bond_xmit_hash_policy_l2()
3387 static int bond_xmit_hash_policy_l23(struct sk_buff *skb, int count)
3389 struct ethhdr *data = (struct ethhdr *)skb->data;
3390 struct iphdr *iph = ip_hdr(skb);
3392 if (skb->protocol == htons(ETH_P_IP)) {
3393 return ((ntohl(iph->saddr ^ iph->daddr) & 0xffff) ^
3394 (data->h_dest[5] ^ data->h_source[5])) % count;
3397 return (data->h_dest[5] ^ data->h_source[5]) % count;
3401 * Hash for the output device based upon layer 3 and layer 4 data. If
3402 * the packet is a frag or not TCP or UDP, just use layer 3 data. If it is
3403 * altogether not IP, mimic bond_xmit_hash_policy_l2()
3405 static int bond_xmit_hash_policy_l34(struct sk_buff *skb, int count)
3407 struct ethhdr *data = (struct ethhdr *)skb->data;
3408 struct iphdr *iph = ip_hdr(skb);
3409 __be16 *layer4hdr = (__be16 *)((u32 *)iph + iph->ihl);
3412 if (skb->protocol == htons(ETH_P_IP)) {
3413 if (!ip_is_fragment(iph) &&
3414 (iph->protocol == IPPROTO_TCP ||
3415 iph->protocol == IPPROTO_UDP)) {
3416 layer4_xor = ntohs((*layer4hdr ^ *(layer4hdr + 1)));
3418 return (layer4_xor ^
3419 ((ntohl(iph->saddr ^ iph->daddr)) & 0xffff)) % count;
3423 return (data->h_dest[5] ^ data->h_source[5]) % count;
3427 * Hash for the output device based upon layer 2 data
3429 static int bond_xmit_hash_policy_l2(struct sk_buff *skb, int count)
3431 struct ethhdr *data = (struct ethhdr *)skb->data;
3433 return (data->h_dest[5] ^ data->h_source[5]) % count;
3436 /*-------------------------- Device entry points ----------------------------*/
3438 static int bond_open(struct net_device *bond_dev)
3440 struct bonding *bond = netdev_priv(bond_dev);
3441 struct slave *slave;
3444 /* reset slave->backup and slave->inactive */
3445 read_lock(&bond->lock);
3446 if (bond->slave_cnt > 0) {
3447 read_lock(&bond->curr_slave_lock);
3448 bond_for_each_slave(bond, slave, i) {
3449 if ((bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3450 && (slave != bond->curr_active_slave)) {
3451 bond_set_slave_inactive_flags(slave);
3453 bond_set_slave_active_flags(slave);
3456 read_unlock(&bond->curr_slave_lock);
3458 read_unlock(&bond->lock);
3460 INIT_DELAYED_WORK(&bond->mcast_work, bond_resend_igmp_join_requests_delayed);
3462 if (bond_is_lb(bond)) {
3463 /* bond_alb_initialize must be called before the timer
3466 if (bond_alb_initialize(bond, (bond->params.mode == BOND_MODE_ALB))) {
3467 /* something went wrong - fail the open operation */
3471 INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3472 queue_delayed_work(bond->wq, &bond->alb_work, 0);
3475 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3476 INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3477 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3480 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3481 if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
3482 INIT_DELAYED_WORK(&bond->arp_work,
3483 bond_activebackup_arp_mon);
3485 INIT_DELAYED_WORK(&bond->arp_work,
3486 bond_loadbalance_arp_mon);
3488 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3489 if (bond->params.arp_validate)
3490 bond->recv_probe = bond_arp_rcv;
3493 if (bond->params.mode == BOND_MODE_8023AD) {
3494 INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3495 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3496 /* register to receive LACPDUs */
3497 bond->recv_probe = bond_3ad_lacpdu_recv;
3498 bond_3ad_initiate_agg_selection(bond, 1);
3504 static int bond_close(struct net_device *bond_dev)
3506 struct bonding *bond = netdev_priv(bond_dev);
3508 write_lock_bh(&bond->lock);
3510 bond->send_peer_notif = 0;
3512 write_unlock_bh(&bond->lock);
3514 if (bond->params.miimon) { /* link check interval, in milliseconds. */
3515 cancel_delayed_work_sync(&bond->mii_work);
3518 if (bond->params.arp_interval) { /* arp interval, in milliseconds. */
3519 cancel_delayed_work_sync(&bond->arp_work);
3522 switch (bond->params.mode) {
3523 case BOND_MODE_8023AD:
3524 cancel_delayed_work_sync(&bond->ad_work);
3528 cancel_delayed_work_sync(&bond->alb_work);
3534 if (delayed_work_pending(&bond->mcast_work))
3535 cancel_delayed_work_sync(&bond->mcast_work);
3537 if (bond_is_lb(bond)) {
3538 /* Must be called only after all
3539 * slaves have been released
3541 bond_alb_deinitialize(bond);
3543 bond->recv_probe = NULL;
3548 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3549 struct rtnl_link_stats64 *stats)
3551 struct bonding *bond = netdev_priv(bond_dev);
3552 struct rtnl_link_stats64 temp;
3553 struct slave *slave;
3556 memset(stats, 0, sizeof(*stats));
3558 read_lock_bh(&bond->lock);
3560 bond_for_each_slave(bond, slave, i) {
3561 const struct rtnl_link_stats64 *sstats =
3562 dev_get_stats(slave->dev, &temp);
3564 stats->rx_packets += sstats->rx_packets;
3565 stats->rx_bytes += sstats->rx_bytes;
3566 stats->rx_errors += sstats->rx_errors;
3567 stats->rx_dropped += sstats->rx_dropped;
3569 stats->tx_packets += sstats->tx_packets;
3570 stats->tx_bytes += sstats->tx_bytes;
3571 stats->tx_errors += sstats->tx_errors;
3572 stats->tx_dropped += sstats->tx_dropped;
3574 stats->multicast += sstats->multicast;
3575 stats->collisions += sstats->collisions;
3577 stats->rx_length_errors += sstats->rx_length_errors;
3578 stats->rx_over_errors += sstats->rx_over_errors;
3579 stats->rx_crc_errors += sstats->rx_crc_errors;
3580 stats->rx_frame_errors += sstats->rx_frame_errors;
3581 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3582 stats->rx_missed_errors += sstats->rx_missed_errors;
3584 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3585 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3586 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3587 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3588 stats->tx_window_errors += sstats->tx_window_errors;
3591 read_unlock_bh(&bond->lock);
3596 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3598 struct net_device *slave_dev = NULL;
3599 struct ifbond k_binfo;
3600 struct ifbond __user *u_binfo = NULL;
3601 struct ifslave k_sinfo;
3602 struct ifslave __user *u_sinfo = NULL;
3603 struct mii_ioctl_data *mii = NULL;
3606 pr_debug("bond_ioctl: master=%s, cmd=%d\n", bond_dev->name, cmd);
3618 * We do this again just in case we were called by SIOCGMIIREG
3619 * instead of SIOCGMIIPHY.
3626 if (mii->reg_num == 1) {
3627 struct bonding *bond = netdev_priv(bond_dev);
3629 read_lock(&bond->lock);
3630 read_lock(&bond->curr_slave_lock);
3631 if (netif_carrier_ok(bond->dev))
3632 mii->val_out = BMSR_LSTATUS;
3634 read_unlock(&bond->curr_slave_lock);
3635 read_unlock(&bond->lock);
3639 case BOND_INFO_QUERY_OLD:
3640 case SIOCBONDINFOQUERY:
3641 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3643 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3646 res = bond_info_query(bond_dev, &k_binfo);
3648 copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3652 case BOND_SLAVE_INFO_QUERY_OLD:
3653 case SIOCBONDSLAVEINFOQUERY:
3654 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3656 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3659 res = bond_slave_info_query(bond_dev, &k_sinfo);
3661 copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3670 if (!capable(CAP_NET_ADMIN))
3673 slave_dev = dev_get_by_name(dev_net(bond_dev), ifr->ifr_slave);
3675 pr_debug("slave_dev=%p:\n", slave_dev);
3680 pr_debug("slave_dev->name=%s:\n", slave_dev->name);
3682 case BOND_ENSLAVE_OLD:
3683 case SIOCBONDENSLAVE:
3684 res = bond_enslave(bond_dev, slave_dev);
3686 case BOND_RELEASE_OLD:
3687 case SIOCBONDRELEASE:
3688 res = bond_release(bond_dev, slave_dev);
3690 case BOND_SETHWADDR_OLD:
3691 case SIOCBONDSETHWADDR:
3692 res = bond_sethwaddr(bond_dev, slave_dev);
3694 case BOND_CHANGE_ACTIVE_OLD:
3695 case SIOCBONDCHANGEACTIVE:
3696 res = bond_ioctl_change_active(bond_dev, slave_dev);
3708 static bool bond_addr_in_mc_list(unsigned char *addr,
3709 struct netdev_hw_addr_list *list,
3712 struct netdev_hw_addr *ha;
3714 netdev_hw_addr_list_for_each(ha, list)
3715 if (!memcmp(ha->addr, addr, addrlen))
3721 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3723 struct bonding *bond = netdev_priv(bond_dev);
3725 if (change & IFF_PROMISC)
3726 bond_set_promiscuity(bond,
3727 bond_dev->flags & IFF_PROMISC ? 1 : -1);
3729 if (change & IFF_ALLMULTI)
3730 bond_set_allmulti(bond,
3731 bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3734 static void bond_set_multicast_list(struct net_device *bond_dev)
3736 struct bonding *bond = netdev_priv(bond_dev);
3737 struct netdev_hw_addr *ha;
3740 read_lock(&bond->lock);
3742 /* looking for addresses to add to slaves' mc list */
3743 netdev_for_each_mc_addr(ha, bond_dev) {
3744 found = bond_addr_in_mc_list(ha->addr, &bond->mc_list,
3745 bond_dev->addr_len);
3747 bond_mc_add(bond, ha->addr);
3750 /* looking for addresses to delete from slaves' list */
3751 netdev_hw_addr_list_for_each(ha, &bond->mc_list) {
3752 found = bond_addr_in_mc_list(ha->addr, &bond_dev->mc,
3753 bond_dev->addr_len);
3755 bond_mc_del(bond, ha->addr);
3758 /* save master's multicast list */
3759 __hw_addr_flush(&bond->mc_list);
3760 __hw_addr_add_multiple(&bond->mc_list, &bond_dev->mc,
3761 bond_dev->addr_len, NETDEV_HW_ADDR_T_MULTICAST);
3763 read_unlock(&bond->lock);
3766 static int bond_neigh_setup(struct net_device *dev, struct neigh_parms *parms)
3768 struct bonding *bond = netdev_priv(dev);
3769 struct slave *slave = bond->first_slave;
3772 const struct net_device_ops *slave_ops
3773 = slave->dev->netdev_ops;
3774 if (slave_ops->ndo_neigh_setup)
3775 return slave_ops->ndo_neigh_setup(slave->dev, parms);
3781 * Change the MTU of all of a master's slaves to match the master
3783 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3785 struct bonding *bond = netdev_priv(bond_dev);
3786 struct slave *slave, *stop_at;
3790 pr_debug("bond=%p, name=%s, new_mtu=%d\n", bond,
3791 (bond_dev ? bond_dev->name : "None"), new_mtu);
3793 /* Can't hold bond->lock with bh disabled here since
3794 * some base drivers panic. On the other hand we can't
3795 * hold bond->lock without bh disabled because we'll
3796 * deadlock. The only solution is to rely on the fact
3797 * that we're under rtnl_lock here, and the slaves
3798 * list won't change. This doesn't solve the problem
3799 * of setting the slave's MTU while it is
3800 * transmitting, but the assumption is that the base
3801 * driver can handle that.
3803 * TODO: figure out a way to safely iterate the slaves
3804 * list, but without holding a lock around the actual
3805 * call to the base driver.
3808 bond_for_each_slave(bond, slave, i) {
3809 pr_debug("s %p s->p %p c_m %p\n",
3812 slave->dev->netdev_ops->ndo_change_mtu);
3814 res = dev_set_mtu(slave->dev, new_mtu);
3817 /* If we failed to set the slave's mtu to the new value
3818 * we must abort the operation even in ACTIVE_BACKUP
3819 * mode, because if we allow the backup slaves to have
3820 * different mtu values than the active slave we'll
3821 * need to change their mtu when doing a failover. That
3822 * means changing their mtu from timer context, which
3823 * is probably not a good idea.
3825 pr_debug("err %d %s\n", res, slave->dev->name);
3830 bond_dev->mtu = new_mtu;
3835 /* unwind from head to the slave that failed */
3837 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3840 tmp_res = dev_set_mtu(slave->dev, bond_dev->mtu);
3842 pr_debug("unwind err %d dev %s\n",
3843 tmp_res, slave->dev->name);
3853 * Note that many devices must be down to change the HW address, and
3854 * downing the master releases all slaves. We can make bonds full of
3855 * bonding devices to test this, however.
3857 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3859 struct bonding *bond = netdev_priv(bond_dev);
3860 struct sockaddr *sa = addr, tmp_sa;
3861 struct slave *slave, *stop_at;
3865 if (bond->params.mode == BOND_MODE_ALB)
3866 return bond_alb_set_mac_address(bond_dev, addr);
3869 pr_debug("bond=%p, name=%s\n",
3870 bond, bond_dev ? bond_dev->name : "None");
3873 * If fail_over_mac is set to active, do nothing and return
3874 * success. Returning an error causes ifenslave to fail.
3876 if (bond->params.fail_over_mac == BOND_FOM_ACTIVE)
3879 if (!is_valid_ether_addr(sa->sa_data))
3880 return -EADDRNOTAVAIL;
3882 /* Can't hold bond->lock with bh disabled here since
3883 * some base drivers panic. On the other hand we can't
3884 * hold bond->lock without bh disabled because we'll
3885 * deadlock. The only solution is to rely on the fact
3886 * that we're under rtnl_lock here, and the slaves
3887 * list won't change. This doesn't solve the problem
3888 * of setting the slave's hw address while it is
3889 * transmitting, but the assumption is that the base
3890 * driver can handle that.
3892 * TODO: figure out a way to safely iterate the slaves
3893 * list, but without holding a lock around the actual
3894 * call to the base driver.
3897 bond_for_each_slave(bond, slave, i) {
3898 const struct net_device_ops *slave_ops = slave->dev->netdev_ops;
3899 pr_debug("slave %p %s\n", slave, slave->dev->name);
3901 if (slave_ops->ndo_set_mac_address == NULL) {
3903 pr_debug("EOPNOTSUPP %s\n", slave->dev->name);
3907 res = dev_set_mac_address(slave->dev, addr);
3909 /* TODO: consider downing the slave
3911 * User should expect communications
3912 * breakage anyway until ARP finish
3915 pr_debug("err %d %s\n", res, slave->dev->name);
3921 memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3925 memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3926 tmp_sa.sa_family = bond_dev->type;
3928 /* unwind from head to the slave that failed */
3930 bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at) {
3933 tmp_res = dev_set_mac_address(slave->dev, &tmp_sa);
3935 pr_debug("unwind err %d dev %s\n",
3936 tmp_res, slave->dev->name);
3943 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3945 struct bonding *bond = netdev_priv(bond_dev);
3946 struct slave *slave, *start_at;
3947 int i, slave_no, res = 1;
3948 struct iphdr *iph = ip_hdr(skb);
3951 * Start with the curr_active_slave that joined the bond as the
3952 * default for sending IGMP traffic. For failover purposes one
3953 * needs to maintain some consistency for the interface that will
3954 * send the join/membership reports. The curr_active_slave found
3955 * will send all of this type of traffic.
3957 if ((iph->protocol == IPPROTO_IGMP) &&
3958 (skb->protocol == htons(ETH_P_IP))) {
3960 read_lock(&bond->curr_slave_lock);
3961 slave = bond->curr_active_slave;
3962 read_unlock(&bond->curr_slave_lock);
3968 * Concurrent TX may collide on rr_tx_counter; we accept
3969 * that as being rare enough not to justify using an
3972 slave_no = bond->rr_tx_counter++ % bond->slave_cnt;
3974 bond_for_each_slave(bond, slave, i) {
3982 bond_for_each_slave_from(bond, slave, i, start_at) {
3983 if (IS_UP(slave->dev) &&
3984 (slave->link == BOND_LINK_UP) &&
3985 bond_is_active_slave(slave)) {
3986 res = bond_dev_queue_xmit(bond, skb, slave->dev);
3993 /* no suitable interface, frame not sent */
3997 return NETDEV_TX_OK;
4002 * in active-backup mode, we know that bond->curr_active_slave is always valid if
4003 * the bond has a usable interface.
4005 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
4007 struct bonding *bond = netdev_priv(bond_dev);
4010 read_lock(&bond->curr_slave_lock);
4012 if (bond->curr_active_slave)
4013 res = bond_dev_queue_xmit(bond, skb,
4014 bond->curr_active_slave->dev);
4017 /* no suitable interface, frame not sent */
4020 read_unlock(&bond->curr_slave_lock);
4022 return NETDEV_TX_OK;
4026 * In bond_xmit_xor() , we determine the output device by using a pre-
4027 * determined xmit_hash_policy(), If the selected device is not enabled,
4028 * find the next active slave.
4030 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
4032 struct bonding *bond = netdev_priv(bond_dev);
4033 struct slave *slave, *start_at;
4038 slave_no = bond->xmit_hash_policy(skb, bond->slave_cnt);
4040 bond_for_each_slave(bond, slave, i) {
4048 bond_for_each_slave_from(bond, slave, i, start_at) {
4049 if (IS_UP(slave->dev) &&
4050 (slave->link == BOND_LINK_UP) &&
4051 bond_is_active_slave(slave)) {
4052 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4058 /* no suitable interface, frame not sent */
4062 return NETDEV_TX_OK;
4066 * in broadcast mode, we send everything to all usable interfaces.
4068 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
4070 struct bonding *bond = netdev_priv(bond_dev);
4071 struct slave *slave, *start_at;
4072 struct net_device *tx_dev = NULL;
4076 read_lock(&bond->curr_slave_lock);
4077 start_at = bond->curr_active_slave;
4078 read_unlock(&bond->curr_slave_lock);
4083 bond_for_each_slave_from(bond, slave, i, start_at) {
4084 if (IS_UP(slave->dev) &&
4085 (slave->link == BOND_LINK_UP) &&
4086 bond_is_active_slave(slave)) {
4088 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
4090 pr_err("%s: Error: bond_xmit_broadcast(): skb_clone() failed\n",
4095 res = bond_dev_queue_xmit(bond, skb2, tx_dev);
4097 dev_kfree_skb(skb2);
4101 tx_dev = slave->dev;
4106 res = bond_dev_queue_xmit(bond, skb, tx_dev);
4110 /* no suitable interface, frame not sent */
4113 /* frame sent to all suitable interfaces */
4114 return NETDEV_TX_OK;
4117 /*------------------------- Device initialization ---------------------------*/
4119 static void bond_set_xmit_hash_policy(struct bonding *bond)
4121 switch (bond->params.xmit_policy) {
4122 case BOND_XMIT_POLICY_LAYER23:
4123 bond->xmit_hash_policy = bond_xmit_hash_policy_l23;
4125 case BOND_XMIT_POLICY_LAYER34:
4126 bond->xmit_hash_policy = bond_xmit_hash_policy_l34;
4128 case BOND_XMIT_POLICY_LAYER2:
4130 bond->xmit_hash_policy = bond_xmit_hash_policy_l2;
4136 * Lookup the slave that corresponds to a qid
4138 static inline int bond_slave_override(struct bonding *bond,
4139 struct sk_buff *skb)
4142 struct slave *slave = NULL;
4143 struct slave *check_slave;
4145 if (!skb->queue_mapping)
4148 /* Find out if any slaves have the same mapping as this skb. */
4149 bond_for_each_slave(bond, check_slave, i) {
4150 if (check_slave->queue_id == skb->queue_mapping) {
4151 slave = check_slave;
4156 /* If the slave isn't UP, use default transmit policy. */
4157 if (slave && slave->queue_id && IS_UP(slave->dev) &&
4158 (slave->link == BOND_LINK_UP)) {
4159 res = bond_dev_queue_xmit(bond, skb, slave->dev);
4166 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb)
4169 * This helper function exists to help dev_pick_tx get the correct
4170 * destination queue. Using a helper function skips a call to
4171 * skb_tx_hash and will put the skbs in the queue we expect on their
4172 * way down to the bonding driver.
4174 u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
4177 * Save the original txq to restore before passing to the driver
4179 bond_queue_mapping(skb) = skb->queue_mapping;
4181 if (unlikely(txq >= dev->real_num_tx_queues)) {
4183 txq -= dev->real_num_tx_queues;
4184 } while (txq >= dev->real_num_tx_queues);
4189 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4191 struct bonding *bond = netdev_priv(dev);
4193 if (TX_QUEUE_OVERRIDE(bond->params.mode)) {
4194 if (!bond_slave_override(bond, skb))
4195 return NETDEV_TX_OK;
4198 switch (bond->params.mode) {
4199 case BOND_MODE_ROUNDROBIN:
4200 return bond_xmit_roundrobin(skb, dev);
4201 case BOND_MODE_ACTIVEBACKUP:
4202 return bond_xmit_activebackup(skb, dev);
4204 return bond_xmit_xor(skb, dev);
4205 case BOND_MODE_BROADCAST:
4206 return bond_xmit_broadcast(skb, dev);
4207 case BOND_MODE_8023AD:
4208 return bond_3ad_xmit_xor(skb, dev);
4211 return bond_alb_xmit(skb, dev);
4213 /* Should never happen, mode already checked */
4214 pr_err("%s: Error: Unknown bonding mode %d\n",
4215 dev->name, bond->params.mode);
4218 return NETDEV_TX_OK;
4222 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
4224 struct bonding *bond = netdev_priv(dev);
4225 netdev_tx_t ret = NETDEV_TX_OK;
4228 * If we risk deadlock from transmitting this in the
4229 * netpoll path, tell netpoll to queue the frame for later tx
4231 if (is_netpoll_tx_blocked(dev))
4232 return NETDEV_TX_BUSY;
4234 read_lock(&bond->lock);
4236 if (bond->slave_cnt)
4237 ret = __bond_start_xmit(skb, dev);
4241 read_unlock(&bond->lock);
4247 * set bond mode specific net device operations
4249 void bond_set_mode_ops(struct bonding *bond, int mode)
4251 struct net_device *bond_dev = bond->dev;
4254 case BOND_MODE_ROUNDROBIN:
4256 case BOND_MODE_ACTIVEBACKUP:
4259 bond_set_xmit_hash_policy(bond);
4261 case BOND_MODE_BROADCAST:
4263 case BOND_MODE_8023AD:
4264 bond_set_xmit_hash_policy(bond);
4271 /* Should never happen, mode already checked */
4272 pr_err("%s: Error: Unknown bonding mode %d\n",
4273 bond_dev->name, mode);
4278 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
4279 struct ethtool_drvinfo *drvinfo)
4281 strncpy(drvinfo->driver, DRV_NAME, 32);
4282 strncpy(drvinfo->version, DRV_VERSION, 32);
4283 snprintf(drvinfo->fw_version, 32, "%d", BOND_ABI_VERSION);
4286 static const struct ethtool_ops bond_ethtool_ops = {
4287 .get_drvinfo = bond_ethtool_get_drvinfo,
4288 .get_link = ethtool_op_get_link,
4291 static const struct net_device_ops bond_netdev_ops = {
4292 .ndo_init = bond_init,
4293 .ndo_uninit = bond_uninit,
4294 .ndo_open = bond_open,
4295 .ndo_stop = bond_close,
4296 .ndo_start_xmit = bond_start_xmit,
4297 .ndo_select_queue = bond_select_queue,
4298 .ndo_get_stats64 = bond_get_stats,
4299 .ndo_do_ioctl = bond_do_ioctl,
4300 .ndo_change_rx_flags = bond_change_rx_flags,
4301 .ndo_set_rx_mode = bond_set_multicast_list,
4302 .ndo_change_mtu = bond_change_mtu,
4303 .ndo_set_mac_address = bond_set_mac_address,
4304 .ndo_neigh_setup = bond_neigh_setup,
4305 .ndo_vlan_rx_add_vid = bond_vlan_rx_add_vid,
4306 .ndo_vlan_rx_kill_vid = bond_vlan_rx_kill_vid,
4307 #ifdef CONFIG_NET_POLL_CONTROLLER
4308 .ndo_netpoll_setup = bond_netpoll_setup,
4309 .ndo_netpoll_cleanup = bond_netpoll_cleanup,
4310 .ndo_poll_controller = bond_poll_controller,
4312 .ndo_add_slave = bond_enslave,
4313 .ndo_del_slave = bond_release,
4314 .ndo_fix_features = bond_fix_features,
4317 static void bond_destructor(struct net_device *bond_dev)
4319 struct bonding *bond = netdev_priv(bond_dev);
4321 destroy_workqueue(bond->wq);
4322 free_netdev(bond_dev);
4325 static void bond_setup(struct net_device *bond_dev)
4327 struct bonding *bond = netdev_priv(bond_dev);
4329 /* initialize rwlocks */
4330 rwlock_init(&bond->lock);
4331 rwlock_init(&bond->curr_slave_lock);
4333 bond->params = bonding_defaults;
4335 /* Initialize pointers */
4336 bond->dev = bond_dev;
4337 INIT_LIST_HEAD(&bond->vlan_list);
4339 /* Initialize the device entry points */
4340 ether_setup(bond_dev);
4341 bond_dev->netdev_ops = &bond_netdev_ops;
4342 bond_dev->ethtool_ops = &bond_ethtool_ops;
4343 bond_set_mode_ops(bond, bond->params.mode);
4345 bond_dev->destructor = bond_destructor;
4347 /* Initialize the device options */
4348 bond_dev->tx_queue_len = 0;
4349 bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
4350 bond_dev->priv_flags |= IFF_BONDING;
4351 bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
4353 /* At first, we block adding VLANs. That's the only way to
4354 * prevent problems that occur when adding VLANs over an
4355 * empty bond. The block will be removed once non-challenged
4356 * slaves are enslaved.
4358 bond_dev->features |= NETIF_F_VLAN_CHALLENGED;
4360 /* don't acquire bond device's netif_tx_lock when
4362 bond_dev->features |= NETIF_F_LLTX;
4364 /* By default, we declare the bond to be fully
4365 * VLAN hardware accelerated capable. Special
4366 * care is taken in the various xmit functions
4367 * when there are slaves that are not hw accel
4371 bond_dev->hw_features = BOND_VLAN_FEATURES |
4372 NETIF_F_HW_VLAN_TX |
4373 NETIF_F_HW_VLAN_RX |
4374 NETIF_F_HW_VLAN_FILTER;
4376 bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_NO_CSUM);
4377 bond_dev->features |= bond_dev->hw_features;
4380 static void bond_work_cancel_all(struct bonding *bond)
4382 if (bond->params.miimon && delayed_work_pending(&bond->mii_work))
4383 cancel_delayed_work_sync(&bond->mii_work);
4385 if (bond->params.arp_interval && delayed_work_pending(&bond->arp_work))
4386 cancel_delayed_work_sync(&bond->arp_work);
4388 if (bond->params.mode == BOND_MODE_ALB &&
4389 delayed_work_pending(&bond->alb_work))
4390 cancel_delayed_work_sync(&bond->alb_work);
4392 if (bond->params.mode == BOND_MODE_8023AD &&
4393 delayed_work_pending(&bond->ad_work))
4394 cancel_delayed_work_sync(&bond->ad_work);
4396 if (delayed_work_pending(&bond->mcast_work))
4397 cancel_delayed_work_sync(&bond->mcast_work);
4401 * Destroy a bonding device.
4402 * Must be under rtnl_lock when this function is called.
4404 static void bond_uninit(struct net_device *bond_dev)
4406 struct bonding *bond = netdev_priv(bond_dev);
4407 struct vlan_entry *vlan, *tmp;
4409 bond_netpoll_cleanup(bond_dev);
4411 /* Release the bonded slaves */
4412 bond_release_all(bond_dev);
4414 list_del(&bond->bond_list);
4416 bond_work_cancel_all(bond);
4418 bond_remove_proc_entry(bond);
4420 bond_debug_unregister(bond);
4422 __hw_addr_flush(&bond->mc_list);
4424 list_for_each_entry_safe(vlan, tmp, &bond->vlan_list, vlan_list) {
4425 list_del(&vlan->vlan_list);
4430 /*------------------------- Module initialization ---------------------------*/
4433 * Convert string input module parms. Accept either the
4434 * number of the mode or its string name. A bit complicated because
4435 * some mode names are substrings of other names, and calls from sysfs
4436 * may have whitespace in the name (trailing newlines, for example).
4438 int bond_parse_parm(const char *buf, const struct bond_parm_tbl *tbl)
4440 int modeint = -1, i, rv;
4441 char *p, modestr[BOND_MAX_MODENAME_LEN + 1] = { 0, };
4443 for (p = (char *)buf; *p; p++)
4444 if (!(isdigit(*p) || isspace(*p)))
4448 rv = sscanf(buf, "%20s", modestr);
4450 rv = sscanf(buf, "%d", &modeint);
4455 for (i = 0; tbl[i].modename; i++) {
4456 if (modeint == tbl[i].mode)
4458 if (strcmp(modestr, tbl[i].modename) == 0)
4465 static int bond_check_params(struct bond_params *params)
4467 int arp_validate_value, fail_over_mac_value, primary_reselect_value;
4470 * Convert string parameters.
4473 bond_mode = bond_parse_parm(mode, bond_mode_tbl);
4474 if (bond_mode == -1) {
4475 pr_err("Error: Invalid bonding mode \"%s\"\n",
4476 mode == NULL ? "NULL" : mode);
4481 if (xmit_hash_policy) {
4482 if ((bond_mode != BOND_MODE_XOR) &&
4483 (bond_mode != BOND_MODE_8023AD)) {
4484 pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4485 bond_mode_name(bond_mode));
4487 xmit_hashtype = bond_parse_parm(xmit_hash_policy,
4489 if (xmit_hashtype == -1) {
4490 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4491 xmit_hash_policy == NULL ? "NULL" :
4499 if (bond_mode != BOND_MODE_8023AD) {
4500 pr_info("lacp_rate param is irrelevant in mode %s\n",
4501 bond_mode_name(bond_mode));
4503 lacp_fast = bond_parse_parm(lacp_rate, bond_lacp_tbl);
4504 if (lacp_fast == -1) {
4505 pr_err("Error: Invalid lacp rate \"%s\"\n",
4506 lacp_rate == NULL ? "NULL" : lacp_rate);
4513 params->ad_select = bond_parse_parm(ad_select, ad_select_tbl);
4514 if (params->ad_select == -1) {
4515 pr_err("Error: Invalid ad_select \"%s\"\n",
4516 ad_select == NULL ? "NULL" : ad_select);
4520 if (bond_mode != BOND_MODE_8023AD) {
4521 pr_warning("ad_select param only affects 802.3ad mode\n");
4524 params->ad_select = BOND_AD_STABLE;
4527 if (max_bonds < 0) {
4528 pr_warning("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4529 max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4530 max_bonds = BOND_DEFAULT_MAX_BONDS;
4534 pr_warning("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to %d\n",
4535 miimon, INT_MAX, BOND_LINK_MON_INTERV);
4536 miimon = BOND_LINK_MON_INTERV;
4540 pr_warning("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4545 if (downdelay < 0) {
4546 pr_warning("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4547 downdelay, INT_MAX);
4551 if ((use_carrier != 0) && (use_carrier != 1)) {
4552 pr_warning("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4557 if (num_peer_notif < 0 || num_peer_notif > 255) {
4558 pr_warning("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4563 /* reset values for 802.3ad */
4564 if (bond_mode == BOND_MODE_8023AD) {
4566 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4567 pr_warning("Forcing miimon to 100msec\n");
4572 if (tx_queues < 1 || tx_queues > 255) {
4573 pr_warning("Warning: tx_queues (%d) should be between "
4574 "1 and 255, resetting to %d\n",
4575 tx_queues, BOND_DEFAULT_TX_QUEUES);
4576 tx_queues = BOND_DEFAULT_TX_QUEUES;
4579 if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4580 pr_warning("Warning: all_slaves_active module parameter (%d), "
4581 "not of valid value (0/1), so it was set to "
4582 "0\n", all_slaves_active);
4583 all_slaves_active = 0;
4586 if (resend_igmp < 0 || resend_igmp > 255) {
4587 pr_warning("Warning: resend_igmp (%d) should be between "
4588 "0 and 255, resetting to %d\n",
4589 resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4590 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4593 /* reset values for TLB/ALB */
4594 if ((bond_mode == BOND_MODE_TLB) ||
4595 (bond_mode == BOND_MODE_ALB)) {
4597 pr_warning("Warning: miimon must be specified, otherwise bonding will not detect link failure and link speed which are essential for TLB/ALB load balancing\n");
4598 pr_warning("Forcing miimon to 100msec\n");
4603 if (bond_mode == BOND_MODE_ALB) {
4604 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",
4609 if (updelay || downdelay) {
4610 /* just warn the user the up/down delay will have
4611 * no effect since miimon is zero...
4613 pr_warning("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4614 updelay, downdelay);
4617 /* don't allow arp monitoring */
4619 pr_warning("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4620 miimon, arp_interval);
4624 if ((updelay % miimon) != 0) {
4625 pr_warning("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4627 (updelay / miimon) * miimon);
4632 if ((downdelay % miimon) != 0) {
4633 pr_warning("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4635 (downdelay / miimon) * miimon);
4638 downdelay /= miimon;
4641 if (arp_interval < 0) {
4642 pr_warning("Warning: arp_interval module parameter (%d) , not in range 0-%d, so it was reset to %d\n",
4643 arp_interval, INT_MAX, BOND_LINK_ARP_INTERV);
4644 arp_interval = BOND_LINK_ARP_INTERV;
4647 for (arp_ip_count = 0;
4648 (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[arp_ip_count];
4650 /* not complete check, but should be good enough to
4652 if (!isdigit(arp_ip_target[arp_ip_count][0])) {
4653 pr_warning("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4654 arp_ip_target[arp_ip_count]);
4657 __be32 ip = in_aton(arp_ip_target[arp_ip_count]);
4658 arp_target[arp_ip_count] = ip;
4662 if (arp_interval && !arp_ip_count) {
4663 /* don't allow arping if no arp_ip_target given... */
4664 pr_warning("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4670 if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
4671 pr_err("arp_validate only supported in active-backup mode\n");
4674 if (!arp_interval) {
4675 pr_err("arp_validate requires arp_interval\n");
4679 arp_validate_value = bond_parse_parm(arp_validate,
4681 if (arp_validate_value == -1) {
4682 pr_err("Error: invalid arp_validate \"%s\"\n",
4683 arp_validate == NULL ? "NULL" : arp_validate);
4687 arp_validate_value = 0;
4690 pr_info("MII link monitoring set to %d ms\n", miimon);
4691 } else if (arp_interval) {
4694 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4696 arp_validate_tbl[arp_validate_value].modename,
4699 for (i = 0; i < arp_ip_count; i++)
4700 pr_info(" %s", arp_ip_target[i]);
4704 } else if (max_bonds) {
4705 /* miimon and arp_interval not set, we need one so things
4706 * work as expected, see bonding.txt for details
4708 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");
4711 if (primary && !USES_PRIMARY(bond_mode)) {
4712 /* currently, using a primary only makes sense
4713 * in active backup, TLB or ALB modes
4715 pr_warning("Warning: %s primary device specified but has no effect in %s mode\n",
4716 primary, bond_mode_name(bond_mode));
4720 if (primary && primary_reselect) {
4721 primary_reselect_value = bond_parse_parm(primary_reselect,
4723 if (primary_reselect_value == -1) {
4724 pr_err("Error: Invalid primary_reselect \"%s\"\n",
4726 NULL ? "NULL" : primary_reselect);
4730 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4733 if (fail_over_mac) {
4734 fail_over_mac_value = bond_parse_parm(fail_over_mac,
4736 if (fail_over_mac_value == -1) {
4737 pr_err("Error: invalid fail_over_mac \"%s\"\n",
4738 arp_validate == NULL ? "NULL" : arp_validate);
4742 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4743 pr_warning("Warning: fail_over_mac only affects active-backup mode.\n");
4745 fail_over_mac_value = BOND_FOM_NONE;
4748 /* fill params struct with the proper values */
4749 params->mode = bond_mode;
4750 params->xmit_policy = xmit_hashtype;
4751 params->miimon = miimon;
4752 params->num_peer_notif = num_peer_notif;
4753 params->arp_interval = arp_interval;
4754 params->arp_validate = arp_validate_value;
4755 params->updelay = updelay;
4756 params->downdelay = downdelay;
4757 params->use_carrier = use_carrier;
4758 params->lacp_fast = lacp_fast;
4759 params->primary[0] = 0;
4760 params->primary_reselect = primary_reselect_value;
4761 params->fail_over_mac = fail_over_mac_value;
4762 params->tx_queues = tx_queues;
4763 params->all_slaves_active = all_slaves_active;
4764 params->resend_igmp = resend_igmp;
4765 params->min_links = min_links;
4768 strncpy(params->primary, primary, IFNAMSIZ);
4769 params->primary[IFNAMSIZ - 1] = 0;
4772 memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4777 static struct lock_class_key bonding_netdev_xmit_lock_key;
4778 static struct lock_class_key bonding_netdev_addr_lock_key;
4780 static void bond_set_lockdep_class_one(struct net_device *dev,
4781 struct netdev_queue *txq,
4784 lockdep_set_class(&txq->_xmit_lock,
4785 &bonding_netdev_xmit_lock_key);
4788 static void bond_set_lockdep_class(struct net_device *dev)
4790 lockdep_set_class(&dev->addr_list_lock,
4791 &bonding_netdev_addr_lock_key);
4792 netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4796 * Called from registration process
4798 static int bond_init(struct net_device *bond_dev)
4800 struct bonding *bond = netdev_priv(bond_dev);
4801 struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4802 struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4804 pr_debug("Begin bond_init for %s\n", bond_dev->name);
4807 * Initialize locks that may be required during
4808 * en/deslave operations. All of the bond_open work
4809 * (of which this is part) should really be moved to
4810 * a phase prior to dev_open
4812 spin_lock_init(&(bond_info->tx_hashtbl_lock));
4813 spin_lock_init(&(bond_info->rx_hashtbl_lock));
4815 bond->wq = create_singlethread_workqueue(bond_dev->name);
4819 bond_set_lockdep_class(bond_dev);
4821 bond_create_proc_entry(bond);
4822 list_add_tail(&bond->bond_list, &bn->dev_list);
4824 bond_prepare_sysfs_group(bond);
4826 bond_debug_register(bond);
4828 __hw_addr_init(&bond->mc_list);
4832 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
4834 if (tb[IFLA_ADDRESS]) {
4835 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
4837 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
4838 return -EADDRNOTAVAIL;
4843 static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
4844 unsigned int *num_queues,
4845 unsigned int *real_num_queues)
4847 *num_queues = tx_queues;
4851 static struct rtnl_link_ops bond_link_ops __read_mostly = {
4853 .priv_size = sizeof(struct bonding),
4854 .setup = bond_setup,
4855 .validate = bond_validate,
4856 .get_tx_queues = bond_get_tx_queues,
4859 /* Create a new bond based on the specified name and bonding parameters.
4860 * If name is NULL, obtain a suitable "bond%d" name for us.
4861 * Caller must NOT hold rtnl_lock; we need to release it here before we
4862 * set up our sysfs entries.
4864 int bond_create(struct net *net, const char *name)
4866 struct net_device *bond_dev;
4871 bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4872 name ? name : "bond%d",
4873 bond_setup, tx_queues);
4875 pr_err("%s: eek! can't alloc netdev!\n", name);
4880 dev_net_set(bond_dev, net);
4881 bond_dev->rtnl_link_ops = &bond_link_ops;
4883 res = register_netdevice(bond_dev);
4885 netif_carrier_off(bond_dev);
4889 bond_destructor(bond_dev);
4893 static int __net_init bond_net_init(struct net *net)
4895 struct bond_net *bn = net_generic(net, bond_net_id);
4898 INIT_LIST_HEAD(&bn->dev_list);
4900 bond_create_proc_dir(bn);
4901 bond_create_sysfs(bn);
4906 static void __net_exit bond_net_exit(struct net *net)
4908 struct bond_net *bn = net_generic(net, bond_net_id);
4910 bond_destroy_sysfs(bn);
4911 bond_destroy_proc_dir(bn);
4914 static struct pernet_operations bond_net_ops = {
4915 .init = bond_net_init,
4916 .exit = bond_net_exit,
4918 .size = sizeof(struct bond_net),
4921 static int __init bonding_init(void)
4926 pr_info("%s", bond_version);
4928 res = bond_check_params(&bonding_defaults);
4932 res = register_pernet_subsys(&bond_net_ops);
4936 res = rtnl_link_register(&bond_link_ops);
4940 bond_create_debugfs();
4942 for (i = 0; i < max_bonds; i++) {
4943 res = bond_create(&init_net, NULL);
4948 register_netdevice_notifier(&bond_netdev_notifier);
4949 register_inetaddr_notifier(&bond_inetaddr_notifier);
4953 rtnl_link_unregister(&bond_link_ops);
4955 unregister_pernet_subsys(&bond_net_ops);
4960 static void __exit bonding_exit(void)
4962 unregister_netdevice_notifier(&bond_netdev_notifier);
4963 unregister_inetaddr_notifier(&bond_inetaddr_notifier);
4965 bond_destroy_debugfs();
4967 rtnl_link_unregister(&bond_link_ops);
4968 unregister_pernet_subsys(&bond_net_ops);
4970 #ifdef CONFIG_NET_POLL_CONTROLLER
4972 * Make sure we don't have an imbalance on our netpoll blocking
4974 WARN_ON(atomic_read(&netpoll_block_tx));
4978 module_init(bonding_init);
4979 module_exit(bonding_exit);
4980 MODULE_LICENSE("GPL");
4981 MODULE_VERSION(DRV_VERSION);
4982 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4983 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");
4984 MODULE_ALIAS_RTNL_LINK("bond");