dozentenmodul/src/main/java/org/openslx/dozmod/util

/*
 * originally based on the dummy device.
 *
 * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
 * Licensed under the GPL. Based on dummy.c, and eql.c devices.
 *
 * bonding.c: an Ethernet Bonding driver
 *
 * This is useful to talk to a Cisco EtherChannel compatible equipment:
 *	Cisco 5500
 *	Sun Trunking (Solaris)
 *	Alteon AceDirector Trunks
 *	Linux Bonding
 *	and probably many L2 switches ...
 *
 * How it works:
 *    ifconfig bond0 ipaddress netmask up
 *      will setup a network device, with an ip address.  No mac address
 *	will be assigned at this time.  The hw mac address will come from
 *	the first slave bonded to the channel.  All slaves will then use
 *	this hw mac address.
 *
 *    ifconfig bond0 down
 *         will release all slaves, marking them as down.
 *
 *    ifenslave bond0 eth0
 *	will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
 *	a: be used as initial mac address
 *	b: if a hw mac address already is there, eth0's hw mac address
 *	   will then be set from bond0.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <net/ip.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/socket.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <asm/dma.h>
#include <linux/uaccess.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/smp.h>
#include <linux/if_ether.h>
#include <net/arp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/if_bonding.h>
#include <linux/jiffies.h>
#include <linux/preempt.h>
#include <net/route.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "bonding.h"
#include "bond_3ad.h"
#include "bond_alb.h"

/*---------------------------- Module parameters ----------------------------*/

/* monitor all links that often (in milliseconds). <=0 disables monitoring */
#define BOND_LINK_MON_INTERV	0
#define BOND_LINK_ARP_INTERV	0

static int max_bonds	= BOND_DEFAULT_MAX_BONDS;
static int tx_queues	= BOND_DEFAULT_TX_QUEUES;
static int num_peer_notif = 1;
static int miimon	= BOND_LINK_MON_INTERV;
static int updelay;
static int downdelay;
static int use_carrier	= 1;
static char *mode;
static char *primary;
static char *primary_reselect;
static char *lacp_rate;
static int min_links;
static char *ad_select;
static char *xmit_hash_policy;
static int arp_interval = BOND_LINK_ARP_INTERV;
static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
static char *arp_validate;
static char *fail_over_mac;
static int all_slaves_active = 0;
static struct bond_params bonding_defaults;
static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;

module_param(max_bonds, int, 0);
MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
module_param(tx_queues, int, 0);
MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
module_param_named(num_grat_arp, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
			       "failover event (alias of num_unsol_na)");
module_param_named(num_unsol_na, num_peer_notif, int, 0644);
MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
			       "failover event (alias of num_grat_arp)");
module_param(miimon, int, 0);
MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
module_param(updelay, int, 0);
MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
module_param(downdelay, int, 0);
MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
			    "in milliseconds");
module_param(use_carrier, int, 0);
MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
			      "0 for off, 1 for on (default)");
module_param(mode, charp, 0);
MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
		       "1 for active-backup, 2 for balance-xor, "
		       "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
		       "6 for balance-alb");
module_param(primary, charp, 0);
MODULE_PARM_DESC(primary, "Primary network device to use");
module_param(primary_reselect, charp, 0);
MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
				   "once it comes up; "
				   "0 for always (default), "
				   "1 for only if speed of primary is "
				   "better, "
				   "2 for only on active slave "
				   "failure");
module_param(lacp_rate, charp, 0);
MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
			    "0 for slow, 1 for fast");
module_param(ad_select, charp, 0);
MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
			    "0 for stable (default), 1 for bandwidth, "
			    "2 for count");
module_param(min_links, int, 0);
MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");

module_param(xmit_hash_policy, charp, 0);
MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
				   "0 for layer 2 (default), 1 for layer 3+4, "
				   "2 for layer 2+3");
module_param(arp_interval, int, 0);
MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
module_param_array(arp_ip_target, charp, NULL, 0);
MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
module_param(arp_validate, charp, 0);
MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
			       "0 for none (default), 1 for active, "
			       "2 for backup, 3 for all");
module_param(fail_over_mac, charp, 0);
MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
				"the same MAC; 0 for none (default), "
				"1 for active, 2 for follow");
module_param(all_slaves_active, int, 0);
MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
				     "by setting active flag for all slaves; "
				     "0 for never (default), 1 for always.");
module_param(resend_igmp, int, 0);
MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
			      "link failure");

/*----------------------------- Global variables ----------------------------*/

#ifdef CONFIG_NET_POLL_CONTROLLER
atomic_t netpoll_block_tx = ATOMIC_INIT(0);
#endif

int bond_net_id __read_mostly;

static __be32 arp_target[BOND_MAX_ARP_TARGETS];
static int arp_ip_count;
static int bond_mode	= BOND_MODE_ROUNDROBIN;
static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
static int lacp_fast;

const struct bond_parm_tbl bond_lacp_tbl[] = {
{	"slow",		AD_LACP_SLOW},
{	"fast",		AD_LACP_FAST},
{	NULL,		-1},
};

const struct bond_parm_tbl bond_mode_tbl[] = {
{	"balance-rr",		BOND_MODE_ROUNDROBIN},
{	"active-backup",	BOND_MODE_ACTIVEBACKUP},
{	"balance-xor",		BOND_MODE_XOR},
{	"broadcast",		BOND_MODE_BROADCAST},
{	"802.3ad",		BOND_MODE_8023AD},
{	"balance-tlb",		BOND_MODE_TLB},
{	"balance-alb",		BOND_MODE_ALB},
{	NULL,			-1},
};

const struct bond_parm_tbl xmit_hashtype_tbl[] = {
{	"layer2",		BOND_XMIT_POLICY_LAYER2},
{	"layer3+4",		BOND_XMIT_POLICY_LAYER34},
{	"layer2+3",		BOND_XMIT_POLICY_LAYER23},
{	NULL,			-1},
};

const struct bond_parm_tbl arp_validate_tbl[] = {
{	"none",			BOND_ARP_VALIDATE_NONE},
{	"active",		BOND_ARP_VALIDATE_ACTIVE},
{	"backup",		BOND_ARP_VALIDATE_BACKUP},
{	"all",			BOND_ARP_VALIDATE_ALL},
{	NULL,			-1},
};

const struct bond_parm_tbl fail_over_mac_tbl[] = {
{	"none",			BOND_FOM_NONE},
{	"active",		BOND_FOM_ACTIVE},
{	"follow",		BOND_FOM_FOLLOW},
{	NULL,			-1},
};

const struct bond_parm_tbl pri_reselect_tbl[] = {
{	"always",		BOND_PRI_RESELECT_ALWAYS},
{	"better",		BOND_PRI_RESELECT_BETTER},
{	"failure",		BOND_PRI_RESELECT_FAILURE},
{	NULL,			-1},
};

struct bond_parm_tbl ad_select_tbl[] = {
{	"stable",	BOND_AD_STABLE},
{	"bandwidth",	BOND_AD_BANDWIDTH},
{	"count",	BOND_AD_COUNT},
{	NULL,		-1},
};

/*-------------------------- Forward declarations ---------------------------*/

static int bond_init(struct net_device *bond_dev);
static void bond_uninit(struct net_device *bond_dev);

/*---------------------------- General routines -----------------------------*/

const char *bond_mode_name(int mode)
{
	static const char *names[] = {
		[BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
		[BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
		[BOND_MODE_XOR] = "load balancing (xor)",
		[BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
		[BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
		[BOND_MODE_TLB] = "transmit load balancing",
		[BOND_MODE_ALB] = "adaptive load balancing",
	};

	if (mode < 0 || mode > BOND_MODE_ALB)
		return "unknown";

	return names[mode];
}

/*---------------------------------- VLAN -----------------------------------*/

/**
 * bond_add_vlan - add a new vlan id on bond
 * @bond: bond that got the notification
 * @vlan_id: the vlan id to add
 *
 * Returns -ENOMEM if allocation failed.
 */
static int bond_add_vlan(struct bonding *bond, unsigned short vlan_id)
{
	struct vlan_entry *vlan;

	pr_debug("bond: %s, vlan id %d\n",
		 (bond ? bond->dev->name : "None"), vlan_id);

	vlan = kzalloc(sizeof(struct vlan_entry), GFP_KERNEL);
	if (!vlan)
		return -ENOMEM;

	INIT_LIST_HEAD(&vlan->vlan_list);
	vlan->vlan_id = vlan_id;

	write_lock_bh(&bond->lock);

	list_add_tail(&vlan->vlan_list, &bond->vlan_list);

	write_unlock_bh(&bond->lock);

	pr_debug("added VLAN ID %d on bond %s\n", vlan_id, bond->dev->name);

	return 0;
}

/**
 * bond_del_vlan - delete a vlan id from bond
 * @bond: bond that got the notification
 * @vlan_id: the vlan id to delete
 *
 * returns -ENODEV if @vlan_id was not found in @bond.
 */
static int bond_del_vlan(struct bonding *bond, unsigned short vlan_id)
{
	struct vlan_entry *vlan;
	int res = -ENODEV;

	pr_debug("bond: %s, vlan id %d\n", bond->dev->name, vlan_id);

	block_netpoll_tx();
	write_lock_bh(&bond->lock);

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		if (vlan->vlan_id == vlan_id) {
			list_del(&vlan->vlan_list);

			if (bond_is_lb(bond))
				bond_alb_clear_vlan(bond, vlan_id);

			pr_debug("removed VLAN ID %d from bond %s\n",
				 vlan_id, bond->dev->name);

			kfree(vlan);

			res = 0;
			goto out;
		}
	}

	pr_debug("couldn't find VLAN ID %d in bond %s\n",
		 vlan_id, bond->dev->name);

out:
	write_unlock_bh(&bond->lock);
	unblock_netpoll_tx();
	return res;
}

/**
 * bond_next_vlan - safely skip to the next item in the vlans list.
 * @bond: the bond we're working on
 * @curr: item we're advancing from
 *
 * Returns %NULL if list is empty, bond->next_vlan if @curr is %NULL,
 * or @curr->next otherwise (even if it is @curr itself again).
 *
 * Caller must hold bond->lock
 */
struct vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr)
{
	struct vlan_entry *next, *last;

	if (list_empty(&bond->vlan_list))
		return NULL;

	if (!curr) {
		next = list_entry(bond->vlan_list.next,
				  struct vlan_entry, vlan_list);
	} else {
		last = list_entry(bond->vlan_list.prev,
				  struct vlan_entry, vlan_list);
		if (last == curr) {
			next = list_entry(bond->vlan_list.next,
					  struct vlan_entry, vlan_list);
		} else {
			next = list_entry(curr->vlan_list.next,
					  struct vlan_entry, vlan_list);
		}
	}

	return next;
}

#define bond_queue_mapping(skb) (*(u16 *)((skb)->cb))

/**
 * bond_dev_queue_xmit - Prepare skb for xmit.
 *
 * @bond: bond device that got this skb for tx.
 * @skb: hw accel VLAN tagged skb to transmit
 * @slave_dev: slave that is supposed to xmit this skbuff
 */
int bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
			struct net_device *slave_dev)
{
	skb->dev = slave_dev;

	skb->queue_mapping = bond_queue_mapping(skb);

	if (unlikely(netpoll_tx_running(slave_dev)))
		bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
	else
		dev_queue_xmit(skb);

	return 0;
}

/*
 * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 * We don't protect the slave list iteration with a lock because:
 * a. This operation is performed in IOCTL context,
 * b. The operation is protected by the RTNL semaphore in the 8021q code,
 * c. Holding a lock with BH disabled while directly calling a base driver
 *    entry point is generally a BAD idea.
 *
 * The design of synchronization/protection for this operation in the 8021q
 * module is good for one or more VLAN devices over a single physical device
 * and cannot be extended for a teaming solution like bonding, so there is a
 * potential race condition here where a net device from the vlan group might
 * be referenced (either by a base driver or the 8021q code) while it is being
 * removed from the system. However, it turns out we're not making matters
 * worse, and if it works for regular VLAN usage it will work here too.
*/

/**
 * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being added
 */
static int bond_vlan_rx_add_vid(struct net_device *bond_dev, uint16_t vid)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave, *stop_at;
	int i, res;

	bond_for_each_slave(bond, slave, i) {
		res = vlan_vid_add(slave->dev, vid);
		if (res)
			goto unwind;
	}

	res = bond_add_vlan(bond, vid);
	if (res) {
		pr_err("%s: Error: Failed to add vlan id %d\n",
		       bond_dev->name, vid);
		return res;
	}

	return 0;

unwind:
	/* unwind from head to the slave that failed */
	stop_at = slave;
	bond_for_each_slave_from_to(bond, slave, i, bond->first_slave, stop_at)
		vlan_vid_del(slave->dev, vid);

	return res;
}

/**
 * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 * @bond_dev: bonding net device that got called
 * @vid: vlan id being removed
 */
static int bond_vlan_rx_kill_vid(struct net_device *bond_dev, uint16_t vid)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave;
	int i, res;

	bond_for_each_slave(bond, slave, i)
		vlan_vid_del(slave->dev, vid);

	res = bond_del_vlan(bond, vid);
	if (res) {
		pr_err("%s: Error: Failed to remove vlan id %d\n",
		       bond_dev->name, vid);
		return res;
	}

	return 0;
}

static void bond_add_vlans_on_slave(struct bonding *bond, struct net_device *slave_dev)
{
	struct vlan_entry *vlan;
	int res;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		res = vlan_vid_add(slave_dev, vlan->vlan_id);
		if (res)
			pr_warning("%s: Failed to add vlan id %d to device %s\n",
				   bond->dev->name, vlan->vlan_id,
				   slave_dev->name);
	}
}

static void bond_del_vlans_from_slave(struct bonding *bond,
				      struct net_device *slave_dev)
{
	struct vlan_entry *vlan;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		if (!vlan->vlan_id)
			continue;
		vlan_vid_del(slave_dev, vlan->vlan_id);
	}
}

/*------------------------------- Link status -------------------------------*/

/*
 * Set the carrier state for the master according to the state of its
 * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 * do special 802.3ad magic.
 *
 * Returns zero if carrier state does not change, nonzero if it does.
 */
static int bond_set_carrier(struct bonding *bond)
{
	struct slave *slave;
	int i;

	if (bond->slave_cnt == 0)
		goto down;

	if (bond->params.mode == BOND_MODE_8023AD)
		return bond_3ad_set_carrier(bond);

	bond_for_each_slave(bond, slave, i) {
		if (slave->link == BOND_LINK_UP) {
			if (!netif_carrier_ok(bond->dev)) {
				netif_carrier_on(bond->dev);
				return 1;
			}
			return 0;
		}
	}

down:
	if (netif_carrier_ok(bond->dev)) {
		netif_carrier_off(bond->dev);
		return 1;
	}
	return 0;
}

/*
 * Get link speed and duplex from the slave's base driver
 * using ethtool. If for some reason the call fails or the
 * values are invalid, set speed and duplex to -1,
 * and return.
 */
static void bond_update_speed_duplex(struct slave *slave)
{
	struct net_device *slave_dev = slave->dev;
	struct ethtool_cmd ecmd;
	u32 slave_speed;
	int res;

	slave->speed = SPEED_UNKNOWN;
	slave->duplex = DUPLEX_UNKNOWN;

	res = __ethtool_get_settings(slave_dev, &ecmd);
	if (res < 0)
		return;

	slave_speed = ethtool_cmd_speed(&ecmd);
	if (slave_speed == 0 || slave_speed == ((__u32) -1))
		return;

	switch (ecmd.duplex) {
	case DUPLEX_FULL:
	case DUPLEX_HALF:
		break;
	default:
		return;
	}

	slave->speed = slave_speed;
	slave->duplex = ecmd.duplex;

	return;
}

/*
 * if <dev> supports MII link status reporting, check its link status.
 *
 * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 * depending upon the setting of the use_carrier parameter.
 *
 * Return either BMSR_LSTATUS, meaning that the link is up (or we
 * can't tell and just pretend it is), or 0, meaning that the link is
 * down.
 *
 * If reporting is non-zero, instead of faking link up, return -1 if
 * both ETHTOOL and MII ioctls fail (meaning the device does not
 * support them).  If use_carrier is set, return whatever it says.
 * It'd be nice if there was a good way to tell if a driver supports
 * netif_carrier, but there really isn't.
 */
static int bond_check_dev_link(struct bonding *bond,
			       struct net_device *slave_dev, int reporting)
{
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
	int (*ioctl)(struct net_device *, struct ifreq *, int);
	struct ifreq ifr;
	struct mii_ioctl_data *mii;

	if (!reporting && !netif_running(slave_dev))
		return 0;

	if (bond->params.use_carrier)
		return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;

	/* Try to get link status using Ethtool first. */
	if (slave_dev->ethtool_ops) {
		if (slave_dev->ethtool_ops->get_link) {
			u32 link;

			link = slave_dev->ethtool_ops->get_link(slave_dev);

			return link ? BMSR_LSTATUS : 0;
		}
	}

	/* Ethtool can't be used, fallback to MII ioctls. */
	ioctl = slave_ops->ndo_do_ioctl;
	if (ioctl) {
		/* TODO: set pointer to correct ioctl on a per team member */
		/*       bases to make this more efficient. that is, once  */
		/*       we determine the correct ioctl, we will always    */
		/*       call it and not the others for that team          */
		/*       member.                                           */

		/*
		 * We cannot assume that SIOCGMIIPHY will also read a
		 * register; not all network drivers (e.g., e100)
		 * support that.
		 */

		/* Yes, the mii is overlaid on the ifreq.ifr_ifru */
		strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
		mii = if_mii(&ifr);
		if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
			mii->reg_num = MII_BMSR;
			if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
				return mii->val_out & BMSR_LSTATUS;
		}
	}

	/*
	 * If reporting, report that either there's no dev->do_ioctl,
	 * or both SIOCGMIIREG and get_link failed (meaning that we
	 * cannot report link status).  If not reporting, pretend
	 * we're ok.
	 */
	return reporting ? -1 : BMSR_LSTATUS;
}

/*----------------------------- Multicast list ------------------------------*/

/*
 * Push the promiscuity flag down to appropriate slaves
 */
static int bond_set_promiscuity(struct bonding *bond, int inc)
{
	int err = 0;
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
			err = dev_set_promiscuity(bond->curr_active_slave->dev,
						  inc);
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			err = dev_set_promiscuity(slave->dev, inc);
			if (err)
				return err;
		}
	}
	return err;
}

/*
 * Push the allmulti flag down to all slaves
 */
static int bond_set_allmulti(struct bonding *bond, int inc)
{
	int err = 0;
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave) {
			err = dev_set_allmulti(bond->curr_active_slave->dev,
					       inc);
		}
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			err = dev_set_allmulti(slave->dev, inc);
			if (err)
				return err;
		}
	}
	return err;
}

/*
 * Add a Multicast address to slaves
 * according to mode
 */
static void bond_mc_add(struct bonding *bond, void *addr)
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave)
			dev_mc_add(bond->curr_active_slave->dev, addr);
	} else {
		struct slave *slave;
		int i;

		bond_for_each_slave(bond, slave, i)
			dev_mc_add(slave->dev, addr);
	}
}

/*
 * Remove a multicast address from slave
 * according to mode
 */
static void bond_mc_del(struct bonding *bond, void *addr)
{
	if (USES_PRIMARY(bond->params.mode)) {
		/* write lock already acquired */
		if (bond->curr_active_slave)
			dev_mc_del(bond->curr_active_slave->dev, addr);
	} else {
		struct slave *slave;
		int i;
		bond_for_each_slave(bond, slave, i) {
			dev_mc_del(slave->dev, addr);
		}
	}
}


static void __bond_resend_igmp_join_requests(struct net_device *dev)
{
	struct in_device *in_dev;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(dev);
	if (in_dev)
		ip_mc_rejoin_groups(in_dev);
	rcu_read_unlock();
}

/*
 * Retrieve the list of registered multicast addresses for the bonding
 * device and retransmit an IGMP JOIN request to the current active
 * slave.
 */
static void bond_resend_igmp_join_requests(struct bonding *bond)
{
	struct net_device *bond_dev, *vlan_dev, *master_dev;
	struct vlan_entry *vlan;

	read_lock(&bond->lock);

	bond_dev = bond->dev;

	/* rejoin all groups on bond device */
	__bond_resend_igmp_join_requests(bond_dev);

	/*
	 * if bond is enslaved to a bridge,
	 * then rejoin all groups on its master
	 */
	master_dev = bond_dev->master;
	if (master_dev)
		if ((master_dev->priv_flags & IFF_EBRIDGE)
			&& (bond_dev->priv_flags & IFF_BRIDGE_PORT))
			__bond_resend_igmp_join_requests(master_dev);

	/* rejoin all groups on vlan devices */
	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		rcu_read_lock();
		vlan_dev = __vlan_find_dev_deep(bond_dev,
						vlan->vlan_id);
		rcu_read_unlock();
		if (vlan_dev)
			__bond_resend_igmp_join_requests(vlan_dev);
	}

	if (--bond->igmp_retrans > 0)
		queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);

	read_unlock(&bond->lock);
}

static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
{
	struct bonding *bond = container_of(work, struct bonding,
					    mcast_work.work);
	bond_resend_igmp_join_requests(bond);
}

/*
 * flush all members of flush->mc_list from device dev->mc_list
 */
static void bond_mc_list_flush(struct net_device *bond_dev,
			       struct net_device *slave_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct netdev_hw_addr *ha;

	netdev_for_each_mc_addr(ha, bond_dev)
		dev_mc_del(slave_dev, ha->addr);

	if (bond->params.mode == BOND_MODE_8023AD) {
		/* del lacpdu mc addr from mc list */
		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;

		dev_mc_del(slave_dev, lacpdu_multicast);
	}
}

/*--------------------------- Active slave change ---------------------------*/

/*
 * Update the mc list and multicast-related flags for the new and
 * old active slaves (if any) according to the multicast mode, and
 * promiscuous flags unconditionally.
 */
static void bond_mc_swap(struct bonding *bond, struct slave *new_active,
			 struct slave *old_active)
{
	struct netdev_hw_addr *ha;

	if (!USES_PRIMARY(bond->params.mode))
		/* nothing to do -  mc list is already up-to-date on
		 * all slaves
		 */
		return;

	if (old_active) {
		if (bond->dev->flags & IFF_PROMISC)
			dev_set_promiscuity(old_active->dev, -1);

		if (bond->dev->flags & IFF_ALLMULTI)
			dev_set_allmulti(old_active->dev, -1);

		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_del(old_active->dev, ha->addr);
	}

	if (new_active) {
		/* FIXME: Signal errors upstream. */
		if (bond->dev->flags & IFF_PROMISC)
			dev_set_promiscuity(new_active->dev, 1);

		if (bond->dev->flags & IFF_ALLMULTI)
			dev_set_allmulti(new_active->dev, 1);

		netdev_for_each_mc_addr(ha, bond->dev)
			dev_mc_add(new_active->dev, ha->addr);
	}
}

/*
 * bond_do_fail_over_mac
 *
 * Perform special MAC address swapping for fail_over_mac settings
 *
 * Called with RTNL, bond->lock for read, curr_slave_lock for write_bh.
 */
static void bond_do_fail_over_mac(struct bonding *bond,
				  struct slave *new_active,
				  struct slave *old_active)
	__releases(&bond->curr_slave_lock)
	__releases(&bond->lock)
	__acquires(&bond->lock)
	__acquires(&bond->curr_slave_lock)
{
	u8 tmp_mac[ETH_ALEN];
	struct sockaddr saddr;
	int rv;

	switch (bond->params.fail_over_mac) {
	case BOND_FOM_ACTIVE:
		if (new_active) {
			memcpy(bond->dev->dev_addr,  new_active->dev->dev_addr,
			       new_active->dev->addr_len);
			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);
			call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
		}
		break;
	case BOND_FOM_FOLLOW:
		/*
		 * if new_active && old_active, swap them
		 * if just old_active, do nothing (going to no active slave)
		 * if just new_active, set new_active to bond's MAC
		 */
		if (!new_active)
			return;

		write_unlock_bh(&bond->curr_slave_lock);
		read_unlock(&bond->lock);

		if (old_active) {
			memcpy(tmp_mac, new_active->dev->dev_addr, ETH_ALEN);
			memcpy(saddr.sa_data, old_active->dev->dev_addr,
			       ETH_ALEN);
			saddr.sa_family = new_active->dev->type;
		} else {
			memcpy(saddr.sa_data, bond->dev->dev_addr, ETH_ALEN);
			saddr.sa_family = bond->dev->type;
		}

		rv = dev_set_mac_address(new_active->dev, &saddr);
		if (rv) {
			pr_err("%s: Error %d setting MAC of slave %s\n",
			       bond->dev->name, -rv, new_active->dev->name);
			goto out;
		}

		if (!old_active)
			goto out;

		memcpy(saddr.sa_data, tmp_mac, ETH_ALEN);
		saddr.sa_family = old_active->dev->type;

		rv = dev_set_mac_address(old_active->dev, &saddr);
		if (rv)
			pr_err("%s: Error %d setting MAC of slave %s\n",
			       bond->dev->name, -rv, new_active->dev->name);
out:
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);
		break;
	default:
		pr_err("%s: bond_do_fail_over_mac impossible: bad policy %d\n",
		       bond->dev->name, bond->params.fail_over_mac);
		break;
	}

}

static bool bond_should_change_active(struct bonding *bond)
{
	struct slave *prim = bond->primary_slave;
	struct slave *curr = bond->curr_active_slave;

	if (!prim || !curr || curr->link != BOND_LINK_UP)
		return true;
	if (bond->force_primary) {
		bond->force_primary = false;
		return true;
	}
	if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
	    (prim->speed < curr->speed ||
	     (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
		return false;
	if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
		return false;
	return true;
}

/**
 * find_best_interface - select the best available slave to be the active one
 * @bond: our bonding struct
 *
 * Warning: Caller must hold curr_slave_lock for writing.
 */
static struct slave *bond_find_best_slave(struct bonding *bond)
{
	struct slave *new_active, *old_active;
	struct slave *bestslave = NULL;
	int mintime = bond->params.updelay;
	int i;

	new_active = bond->curr_active_slave;

	if (!new_active) { /* there were no active slaves left */
		if (bond->slave_cnt > 0)   /* found one slave */
			new_active = bond->first_slave;
		else
			return NULL; /* still no slave, return NULL */
	}

	if ((bond->primary_slave) &&
	    bond->primary_slave->link == BOND_LINK_UP &&
	    bond_should_change_active(bond)) {
		new_active = bond->primary_slave;
	}

	/* remember where to stop iterating over the slaves */
	old_active = new_active;

	bond_for_each_slave_from(bond, new_active, i, old_active) {
		if (new_active->link == BOND_LINK_UP) {
			return new_active;
		} else if (new_active->link == BOND_LINK_BACK &&
			   IS_UP(new_active->dev)) {
			/* link up, but waiting for stabilization */
			if (new_active->delay < mintime) {
				mintime = new_active->delay;
				bestslave = new_active;
			}
		}
	}

	return bestslave;
}

static bool bond_should_notify_peers(struct bonding *bond)
{
	struct slave *slave = bond->curr_active_slave;

	pr_debug("bond_should_notify_peers: bond %s slave %s\n",
		 bond->dev->name, slave ? slave->dev->name : "NULL");

	if (!slave || !bond->send_peer_notif ||
	    test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
		return false;

	bond->send_peer_notif--;
	return true;
}

/**
 * change_active_interface - change the active slave into the specified one
 * @bond: our bonding struct
 * @new: the new slave to make the active one
 *
 * Set the new slave to the bond's settings and unset them on the old
 * curr_active_slave.
 * Setting include flags, mc-list, promiscuity, allmulti, etc.
 *
 * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 * because it is apparently the best available slave we have, even though its
 * updelay hasn't timed out yet.
 *
 * If new_active is not NULL, caller must hold bond->lock for read and
 * curr_slave_lock for write_bh.
 */
void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
{
	struct slave *old_active = bond->curr_active_slave;

	if (old_active == new_active)
		return;

	if (new_active) {
		new_active->jiffies = jiffies;

		if (new_active->link == BOND_LINK_BACK) {
			if (USES_PRIMARY(bond->params.mode)) {
				pr_info("%s: making interface %s the new active one %d ms earlier.\n",
					bond->dev->name, new_active->dev->name,
					(bond->params.updelay - new_active->delay) * bond->params.miimon);
			}

			new_active->delay = 0;
			new_active->link = BOND_LINK_UP;

			if (bond->params.mode == BOND_MODE_8023AD)
				bond_3ad_handle_link_change(new_active, BOND_LINK_UP);

			if (bond_is_lb(bond))
				bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
		} else {
			if (USES_PRIMARY(bond->params.mode)) {
				pr_info("%s: making interface %s the new active one.\n",
					bond->dev->name, new_active->dev->name);
			}
		}
	}

	if (USES_PRIMARY(bond->params.mode))
		bond_mc_swap(bond, new_active, old_active);

	if (bond_is_lb(bond)) {
		bond_alb_handle_active_change(bond, new_active);
		if (old_active)
			bond_set_slave_inactive_flags(old_active);
		if (new_active)
			bond_set_slave_active_flags(new_active);
	} else {
		bond->curr_active_slave = new_active;
	}

	if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
		if (old_active)
			bond_set_slave_inactive_flags(old_active);

		if (new_active) {
			bool should_notify_peers = false;

			bond_set_slave_active_flags(new_active);

			if (bond->params.fail_over_mac)
				bond_do_fail_over_mac(bond, new_active,
						      old_active);

			if (netif_running(bond->dev)) {
				bond->send_peer_notif =
					bond->params.num_peer_notif;
				should_notify_peers =
					bond_should_notify_peers(bond);
			}

			write_unlock_bh(&bond->curr_slave_lock);
			read_unlock(&bond->lock);

			netdev_bonding_change(bond->dev, NETDEV_BONDING_FAILOVER);
			if (should_notify_peers)
				netdev_bonding_change(bond->dev,
						      NETDEV_NOTIFY_PEERS);

			read_lock(&bond->lock);
			write_lock_bh(&bond->curr_slave_lock);
		}
	}

	/* resend IGMP joins since active slave has changed or
	 * all were sent on curr_active_slave.
	 * resend only if bond is brought up with the affected
	 * bonding modes and the retransmission is enabled */
	if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
	    ((USES_PRIMARY(bond->params.mode) && new_active) ||
	     bond->params.mode == BOND_MODE_ROUNDROBIN)) {
		bond->igmp_retrans = bond->params.resend_igmp;
		queue_delayed_work(bond->wq, &bond->mcast_work, 0);
	}
}

/**
 * bond_select_active_slave - select a new active slave, if needed
 * @bond: our bonding struct
 *
 * This functions should be called when one of the following occurs:
 * - The old curr_active_slave has been released or lost its link.
 * - The primary_slave has got its link back.
 * - A slave has got its link back and there's no old curr_active_slave.
 *
 * Caller must hold bond->lock for read and curr_slave_lock for write_bh.
 */
void bond_select_active_slave(struct bonding *bond)
{
	struct slave *best_slave;
	int rv;

	best_slave = bond_find_best_slave(bond);
	if (best_slave != bond->curr_active_slave) {
		bond_change_active_slave(bond, best_slave);
		rv = bond_set_carrier(bond);
		if (!rv)
			return;

		if (netif_carrier_ok(bond->dev)) {
			pr_info("%s: first active interface up!\n",
				bond->dev->name);
		} else {
			pr_info("%s: now running without any active interface !\n",
				bond->dev->name);
		}
	}
}

/*--------------------------- slave list handling ---------------------------*/

/*
 * This function attaches the slave to the end of list.
 *
 * bond->lock held for writing by caller.
 */
static void bond_attach_slave(struct bonding *bond, struct slave *new_slave)
{
	if (bond->first_slave == NULL) { /* attaching the first slave */
		new_slave->next = new_slave;
		new_slave->prev = new_slave;
		bond->first_slave = new_slave;
	} else {
		new_slave->next = bond->first_slave;
		new_slave->prev = bond->first_slave->prev;
		new_slave->next->prev = new_slave;
		new_slave->prev->next = new_slave;
	}

	bond->slave_cnt++;
}

/*
 * This function detaches the slave from the list.
 * WARNING: no check is made to verify if the slave effectively
 * belongs to <bond>.
 * Nothing is freed on return, structures are just unchained.
 * If any slave pointer in bond was pointing to <slave>,
 * it should be changed by the calling function.
 *
 * bond->lock held for writing by caller.
 */
static void bond_detach_slave(struct bonding *bond, struct slave *slave)
{
	if (slave->next)
		slave->next->prev = slave->prev;

	if (slave->prev)
		slave->prev->next = slave->next;

	if (bond->first_slave == slave) { /* slave is the first slave */
		if (bond->slave_cnt > 1) { /* there are more slave */
			bond->first_slave = slave->next;
		} else {
			bond->first_slave = NULL; /* slave was the last one */
		}
	}

	slave->next = NULL;
	slave->prev = NULL;
	bond->slave_cnt--;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static inline int slave_enable_netpoll(struct slave *slave)
{
	struct netpoll *np;
	int err = 0;

	np = kzalloc(sizeof(*np), GFP_KERNEL);
	err = -ENOMEM;
	if (!np)
		goto out;

	np->dev = slave->dev;
	strlcpy(np->dev_name, slave->dev->name, IFNAMSIZ);
	err = __netpoll_setup(np);
	if (err) {
		kfree(np);
		goto out;
	}
	slave->np = np;
out:
	return err;
}
static inline void slave_disable_netpoll(struct slave *slave)
{
	struct netpoll *np = slave->np;

	if (!np)
		return;

	slave->np = NULL;
	synchronize_rcu_bh();
	__netpoll_cleanup(np);
	kfree(np);
}
static inline bool slave_dev_support_netpoll(struct net_device *slave_dev)
{
	if (slave_dev->priv_flags & IFF_DISABLE_NETPOLL)
		return false;
	if (!slave_dev->netdev_ops->ndo_poll_controller)
		return false;
	return true;
}

static void bond_poll_controller(struct net_device *bond_dev)
{
}

static void __bond_netpoll_cleanup(struct bonding *bond)
{
	struct slave *slave;
	int i;

	bond_for_each_slave(bond, slave, i)
		if (IS_UP(slave->dev))
			slave_disable_netpoll(slave);
}
static void bond_netpoll_cleanup(struct net_device *bond_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);

	read_lock(&bond->lock);
	__bond_netpoll_cleanup(bond);
	read_unlock(&bond->lock);
}

static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
{
	struct bonding *bond = netdev_priv(dev);
	struct slave *slave;
	int i, err = 0;

	read_lock(&bond->lock);
	bond_for_each_slave(bond, slave, i) {
		err = slave_enable_netpoll(slave);
		if (err) {
			__bond_netpoll_cleanup(bond);
			break;
		}
	}
	read_unlock(&bond->lock);
	return err;
}

static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
{
	return bond->dev->npinfo;
}

#else
static inline int slave_enable_netpoll(struct slave *slave)
{
	return 0;
}
static inline void slave_disable_netpoll(struct slave *slave)
{
}
static void bond_netpoll_cleanup(struct net_device *bond_dev)
{
}
#endif

/*---------------------------------- IOCTL ----------------------------------*/

static int bond_sethwaddr(struct net_device *bond_dev,
			  struct net_device *slave_dev)
{
	pr_debug("bond_dev=%p\n", bond_dev);
	pr_debug("slave_dev=%p\n", slave_dev);
	pr_debug("slave_dev->addr_len=%d\n", slave_dev->addr_len);
	memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
	return 0;
}

static netdev_features_t bond_fix_features(struct net_device *dev,
	netdev_features_t features)
{
	struct slave *slave;
	struct bonding *bond = netdev_priv(dev);
	netdev_features_t mask;
	int i;

	read_lock(&bond->lock);

	if (!bond->first_slave) {
		/* Disable adding VLANs to empty bond. But why? --mq */
		features |= NETIF_F_VLAN_CHALLENGED;
		goto out;
	}

	mask = features;
	features &= ~NETIF_F_ONE_FOR_ALL;
	features |= NETIF_F_ALL_FOR_ALL;

	bond_for_each_slave(bond, slave, i) {
		features = netdev_increment_features(features,
						     slave->dev->features,
						     mask);
	}

out:
	read_unlock(&bond->lock);
	return features;
}

#define BOND_VLAN_FEATURES	(NETIF_F_ALL_CSUM | NETIF_F_SG | \
				 NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
				 NETIF_F_HIGHDMA | NETIF_F_LRO)

static void bond_compute_features(struct bonding *bond)
{
	struct slave *slave;
	struct net_device *bond_dev = bond->dev;
	netdev_features_t vlan_features = BOND_VLAN_FEATURES;
	unsigned short max_hard_header_len = ETH_HLEN;
	int i;

	read_lock(&bond->lock);

	if (!bond->first_slave)
		goto done;

	bond_for_each_slave(bond, slave, i) {
		vlan_features = netdev_increment_features(vlan_features,
			slave->dev->vlan_features, BOND_VLAN_FEATURES);

		if (slave->dev->hard_header_len > max_hard_header_len)
			max_hard_header_len = slave->dev->hard_header_len;
	}

done:
	bond_dev->vlan_features = vlan_features;
	bond_dev->hard_header_len = max_hard_header_len;

	read_unlock(&bond->lock);

	netdev_change_features(bond_dev);
}

static void bond_setup_by_slave(struct net_device *bond_dev,
				struct net_device *slave_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);

	bond_dev->header_ops	    = slave_dev->header_ops;

	bond_dev->type		    = slave_dev->type;
	bond_dev->hard_header_len   = slave_dev->hard_header_len;
	bond_dev->addr_len	    = slave_dev->addr_len;

	memcpy(bond_dev->broadcast, slave_dev->broadcast,
		slave_dev->addr_len);
	bond->setup_by_slave = 1;
}

/* On bonding slaves other than the currently active slave, suppress
 * duplicates except for alb non-mcast/bcast.
 */
static bool bond_should_deliver_exact_match(struct sk_buff *skb,
					    struct slave *slave,
					    struct bonding *bond)
{
	if (bond_is_slave_inactive(slave)) {
		if (bond->params.mode == BOND_MODE_ALB &&
		    skb->pkt_type != PACKET_BROADCAST &&
		    skb->pkt_type != PACKET_MULTICAST)
			return false;
		return true;
	}
	return false;
}

static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
{
	struct sk_buff *skb = *pskb;
	struct slave *slave;
	struct bonding *bond;
	int (*recv_probe)(const struct sk_buff *, struct bonding *,
			  struct slave *);
	int ret = RX_HANDLER_ANOTHER;

	skb = skb_share_check(skb, GFP_ATOMIC);
	if (unlikely(!skb))
		return RX_HANDLER_CONSUMED;

	*pskb = skb;

	slave = bond_slave_get_rcu(skb->dev);
	bond = slave->bond;

	if (bond->params.arp_interval)
		slave->dev->last_rx = jiffies;

	recv_probe = ACCESS_ONCE(bond->recv_probe);
	if (recv_probe) {
		ret = recv_probe(skb, bond, slave);
		if (ret == RX_HANDLER_CONSUMED) {
			consume_skb(skb);
			return ret;
		}
	}

	if (bond_should_deliver_exact_match(skb, slave, bond)) {
		return RX_HANDLER_EXACT;
	}

	skb->dev = bond->dev;

	if (bond->params.mode == BOND_MODE_ALB &&
	    bond->dev->priv_flags & IFF_BRIDGE_PORT &&
	    skb->pkt_type == PACKET_HOST) {

		if (unlikely(skb_cow_head(skb,
					  skb->data - skb_mac_header(skb)))) {
			kfree_skb(skb);
			return RX_HANDLER_CONSUMED;
		}
		memcpy(eth_hdr(skb)->h_dest, bond->dev->dev_addr, ETH_ALEN);
	}

	return ret;
}

/* enslave device <slave> to bond device <master> */
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
	struct slave *new_slave = NULL;
	struct netdev_hw_addr *ha;
	struct sockaddr addr;
	int link_reporting;
	int res = 0;

	if (!bond->params.use_carrier && slave_dev->ethtool_ops == NULL &&
		slave_ops->ndo_do_ioctl == NULL) {
		pr_warning("%s: Warning: no link monitoring support for %s\n",
			   bond_dev->name, slave_dev->name);
	}

	/* already enslaved */
	if (slave_dev->flags & IFF_SLAVE) {
		pr_debug("Error, Device was already enslaved\n");
		return -EBUSY;
	}

	/* vlan challenged mutual exclusion */
	/* no need to lock since we're protected by rtnl_lock */
	if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
		pr_debug("%s: NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
		if (bond_vlan_used(bond)) {
			pr_err("%s: Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
			       bond_dev->name, slave_dev->name, bond_dev->name);
			return -EPERM;
		} else {
			pr_warning("%s: Warning: enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
				   bond_dev->name, slave_dev->name,
				   slave_dev->name, bond_dev->name);
		}
	} else {
		pr_debug("%s: ! NETIF_F_VLAN_CHALLENGED\n", slave_dev->name);
	}

	/*
	 * Old ifenslave binaries are no longer supported.  These can
	 * be identified with moderate accuracy by the state of the slave:
	 * the current ifenslave will set the interface down prior to
	 * enslaving it; the old ifenslave will not.
	 */
	if ((slave_dev->flags & IFF_UP)) {
		pr_err("%s is up. This may be due to an out of date ifenslave.\n",
		       slave_dev->name);
		res = -EPERM;
		goto err_undo_flags;
	}

	/* set bonding device ether type by slave - bonding netdevices are
	 * created with ether_setup, so when the slave type is not ARPHRD_ETHER
	 * there is a need to override some of the type dependent attribs/funcs.
	 *
	 * bond ether type mutual exclusion - don't allow slaves of dissimilar
	 * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
	 */
	if (bond->slave_cnt == 0) {
		if (bond_dev->type != slave_dev->type) {
			pr_debug("%s: change device type from %d to %d\n",
				 bond_dev->name,
				 bond_dev->type, slave_dev->type);

			res = netdev_bonding_change(bond_dev,
						    NETDEV_PRE_TYPE_CHANGE);
			res = notifier_to_errno(res);
			if (res) {
				pr_err("%s: refused to change device type\n",
				       bond_dev->name);
				res = -EBUSY;
				goto err_undo_flags;
			}

			/* Flush unicast and multicast addresses */
			dev_uc_flush(bond_dev);
			dev_mc_flush(bond_dev);

			if (slave_dev->type != ARPHRD_ETHER)
				bond_setup_by_slave(bond_dev, slave_dev);
			else {
				ether_setup(bond_dev);
				bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
			}

			netdev_bonding_change(bond_dev,
					      NETDEV_POST_TYPE_CHANGE);
		}
	} else if (bond_dev->type != slave_dev->type) {
		pr_err("%s ether type (%d) is different from other slaves (%d), can not enslave it.\n",
		       slave_dev->name,
		       slave_dev->type, bond_dev->type);
		res = -EINVAL;
		goto err_undo_flags;
	}

	if (slave_ops->ndo_set_mac_address == NULL) {
		if (bond->slave_cnt == 0) {
			pr_warning("%s: Warning: The first slave device specified does not support setting the MAC address. Setting fail_over_mac to active.",
				   bond_dev->name);
			bond->params.fail_over_mac = BOND_FOM_ACTIVE;
		} else if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
			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",
			       bond_dev->name);
			res = -EOPNOTSUPP;
			goto err_undo_flags;
		}
	}

	call_netdevice_notifiers(NETDEV_JOIN, slave_dev);

	/* If this is the first slave, then we need to set the master's hardware
	 * address to be the same as the slave's. */
	if (is_zero_ether_addr(bond->dev->dev_addr))
		memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
		       slave_dev->addr_len);


	new_slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
	if (!new_slave) {
		res = -ENOMEM;
		goto err_undo_flags;
	}

	/*
	 * Set the new_slave's queue_id to be zero.  Queue ID mapping
	 * is set via sysfs or module option if desired.
	 */
	new_slave->queue_id = 0;

	/* Save slave's original mtu and then set it to match the bond */
	new_slave->original_mtu = slave_dev->mtu;
	res = dev_set_mtu(slave_dev, bond->dev->mtu);
	if (res) {
		pr_debug("Error %d calling dev_set_mtu\n", res);
		goto err_free;
	}

	/*
	 * Save slave's original ("permanent") mac address for modes
	 * that need it, and for restoring it upon release, and then
	 * set it to the master's address
	 */
	memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);

	if (!bond->params.fail_over_mac) {
		/*
		 * Set slave to master's mac address.  The application already
		 * set the master's mac address to that of the first slave
		 */
		memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
		addr.sa_family = slave_dev->type;
		res = dev_set_mac_address(slave_dev, &addr);
		if (res) {
			pr_debug("Error %d calling set_mac_address\n", res);
			goto err_restore_mtu;
		}
	}

	res = netdev_set_bond_master(slave_dev, bond_dev);
	if (res) {
		pr_debug("Error %d calling netdev_set_bond_master\n", res);
		goto err_restore_mac;
	}

	/* open the slave since the application closed it */
	res = dev_open(slave_dev);
	if (res) {
		pr_debug("Opening slave %s failed\n", slave_dev->name);
		goto err_unset_master;
	}

	new_slave->bond = bond;
	new_slave->dev = slave_dev;
	slave_dev->priv_flags |= IFF_BONDING;

	if (bond_is_lb(bond)) {
		/* bond_alb_init_slave() must be called before all other stages since
		 * it might fail and we do not want to have to undo everything
		 */
		res = bond_alb_init_slave(bond, new_slave);
		if (res)
			goto err_close;
	}

	/* If the mode USES_PRIMARY, then the new slave gets the
	 * master's promisc (and mc) settings only if it becomes the
	 * curr_active_slave, and that is taken care of later when calling
	 * bond_change_active()
	 */
	if (!USES_PRIMARY(bond->params.mode)) {
		/* set promiscuity level to new slave */
		if (bond_dev->flags & IFF_PROMISC) {
			res = dev_set_promiscuity(slave_dev, 1);
			if (res)
				goto err_close;
		}

		/* set allmulti level to new slave */
		if (bond_dev->flags & IFF_ALLMULTI) {
			res = dev_set_allmulti(slave_dev, 1);
			if (res)
				goto err_close;
		}

		netif_addr_lock_bh(bond_dev);
		/* upload master's mc_list to new slave */
		netdev_for_each_mc_addr(ha, bond_dev)
			dev_mc_add(slave_dev, ha->addr);
		netif_addr_unlock_bh(bond_dev);
	}

	if (bond->params.mode == BOND_MODE_8023AD) {
		/* add lacpdu mc addr to mc list */
		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;

		dev_mc_add(slave_dev, lacpdu_multicast);
	}

	bond_add_vlans_on_slave(bond, slave_dev);

	write_lock_bh(&bond->lock);

	bond_attach_slave(bond, new_slave);

	new_slave->delay = 0;
	new_slave->link_failure_count = 0;

	write_unlock_bh(&bond->lock);

	bond_compute_features(bond);

	read_lock(&bond->lock);

	new_slave->last_arp_rx = jiffies -
		(msecs_to_jiffies(bond->params.arp_interval) + 1);

	if (bond->params.miimon && !bond->params.use_carrier) {
		link_reporting = bond_check_dev_link(bond, slave_dev, 1);

		if ((link_reporting == -1) && !bond->params.arp_interval) {
			/*
			 * miimon is set but a bonded network driver
			 * does not support ETHTOOL/MII and
			 * arp_interval is not set.  Note: if
			 * use_carrier is enabled, we will never go
			 * here (because netif_carrier is always
			 * supported); thus, we don't need to change
			 * the messages for netif_carrier.
			 */
			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",
			       bond_dev->name, slave_dev->name);
		} else if (link_reporting == -1) {
			/* unable get link status using mii/ethtool */
			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",
				   bond_dev->name, slave_dev->name);
		}
	}

	/* check for initial state */
	if (bond->params.miimon) {
		if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
			if (bond->params.updelay) {
				new_slave->link = BOND_LINK_BACK;
				new_slave->delay = bond->params.updelay;
			} else {
				new_slave->link = BOND_LINK_UP;
			}
		} else {
			new_slave->link = BOND_LINK_DOWN;
		}
	} else if (bond->params.arp_interval) {
		new_slave->link = (netif_carrier_ok(slave_dev) ?
			BOND_LINK_UP : BOND_LINK_DOWN);
	} else {
		new_slave->link = BOND_LINK_UP;
	}

	if (new_slave->link != BOND_LINK_DOWN)
		new_slave->jiffies = jiffies;
	pr_debug("Initial state of slave_dev is BOND_LINK_%s\n",
		new_slave->link == BOND_LINK_DOWN ? "DOWN" :
			(new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));

	bond_update_speed_duplex(new_slave);

	if (USES_PRIMARY(bond->params.mode) && bond->params.primary[0]) {
		/* if there is a primary slave, remember it */
		if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
			bond->primary_slave = new_slave;
			bond->force_primary = true;
		}
	}

	write_lock_bh(&bond->curr_slave_lock);

	switch (bond->params.mode) {
	case BOND_MODE_ACTIVEBACKUP:
		bond_set_slave_inactive_flags(new_slave);
		bond_select_active_slave(bond);
		break;
	case BOND_MODE_8023AD:
		/* in 802.3ad mode, the internal mechanism
		 * will activate the slaves in the selected
		 * aggregator
		 */
		bond_set_slave_inactive_flags(new_slave);
		/* if this is the first slave */
		if (bond->slave_cnt == 1) {
			SLAVE_AD_INFO(new_slave).id = 1;
			/* Initialize AD with the number of times that the AD timer is called in 1 second
			 * can be called only after the mac address of the bond is set
			 */
			bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
		} else {
			SLAVE_AD_INFO(new_slave).id =
				SLAVE_AD_INFO(new_slave->prev).id + 1;
		}

		bond_3ad_bind_slave(new_slave);
		break;
	case BOND_MODE_TLB:
	case BOND_MODE_ALB:
		bond_set_active_slave(new_slave);
		bond_set_slave_inactive_flags(new_slave);
		bond_select_active_slave(bond);
		break;
	default:
		pr_debug("This slave is always active in trunk mode\n");

		/* always active in trunk mode */
		bond_set_active_slave(new_slave);

		/* In trunking mode there is little meaning to curr_active_slave
		 * anyway (it holds no special properties of the bond device),
		 * so we can change it without calling change_active_interface()
		 */
		if (!bond->curr_active_slave)
			bond->curr_active_slave = new_slave;

		break;
	} /* switch(bond_mode) */

	write_unlock_bh(&bond->curr_slave_lock);

	bond_set_carrier(bond);

#ifdef CONFIG_NET_POLL_CONTROLLER
	slave_dev->npinfo = bond_netpoll_info(bond);
	if (slave_dev->npinfo) {
		if (slave_enable_netpoll(new_slave)) {
			read_unlock(&bond->lock);
			pr_info("Error, %s: master_dev is using netpoll, "
				 "but new slave device does not support netpoll.\n",
				 bond_dev->name);
			res = -EBUSY;
			goto err_detach;
		}
	}
#endif

	read_unlock(&bond->lock);

	res = bond_create_slave_symlinks(bond_dev, slave_dev);
	if (res)
		goto err_detach;

	res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
					 new_slave);
	if (res) {
		pr_debug("Error %d calling netdev_rx_handler_register\n", res);
		goto err_dest_symlinks;
	}

	pr_info("%s: enslaving %s as a%s interface with a%s link.\n",
		bond_dev->name, slave_dev->name,
		bond_is_active_slave(new_slave) ? "n active" : " backup",
		new_slave->link != BOND_LINK_DOWN ? "n up" : " down");

	/* enslave is successful */
	return 0;

/* Undo stages on error */
err_dest_symlinks:
	bond_destroy_slave_symlinks(bond_dev, slave_dev);

err_detach:
	write_lock_bh(&bond->lock);
	bond_detach_slave(bond, new_slave);
	write_unlock_bh(&bond->lock);

err_close:
	dev_close(slave_dev);

err_unset_master:
	netdev_set_bond_master(slave_dev, NULL);

err_restore_mac:
	if (!bond->params.fail_over_mac) {
		/* XXX TODO - fom follow mode needs to change master's
		 * MAC if this slave's MAC is in use by the bond, or at
		 * least print a warning.
		 */
		memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
		addr.sa_family = slave_dev->type;
		dev_set_mac_address(slave_dev, &addr);
	}

err_restore_mtu:
	dev_set_mtu(slave_dev, new_slave->original_mtu);

err_free:
	kfree(new_slave);

err_undo_flags:
	bond_compute_features(bond);

	return res;
}

/*
 * Try to release the slave device <slave> from the bond device <master>
 * It is legal to access curr_active_slave without a lock because all the function
 * is write-locked.
 *
 * The rules for slave state should be:
 *   for Active/Backup:
 *     Active stays on all backups go down
 *   for Bonded connections:
 *     The first up interface should be left on and all others downed.
 */
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave, *oldcurrent;
	struct sockaddr addr;
	netdev_features_t old_features = bond_dev->features;

	/* slave is not a slave or master is not master of this slave */
	if (!(slave_dev->flags & IFF_SLAVE) ||
	    (slave_dev->master != bond_dev)) {
		pr_err("%s: Error: cannot release %s.\n",
		       bond_dev->name, slave_dev->name);
		return -EINVAL;
	}

	block_netpoll_tx();
	netdev_bonding_change(bond_dev, NETDEV_RELEASE);
	write_lock_bh(&bond->lock);

	slave = bond_get_slave_by_dev(bond, slave_dev);
	if (!slave) {
		/* not a slave of this bond */
		pr_info("%s: %s not enslaved\n",
			bond_dev->name, slave_dev->name);
		write_unlock_bh(&bond->lock);
		unblock_netpoll_tx();
		return -EINVAL;
	}

	/* unregister rx_handler early so bond_handle_frame wouldn't be called
	 * for this slave anymore.
	 */
	netdev_rx_handler_unregister(slave_dev);
	write_unlock_bh(&bond->lock);
	synchronize_net();
	write_lock_bh(&bond->lock);

	if (!bond->params.fail_over_mac) {
		if (ether_addr_equal(bond_dev->dev_addr, slave->perm_hwaddr) &&
		    bond->slave_cnt > 1)
			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",
				   bond_dev->name, slave_dev->name,
				   slave->perm_hwaddr,
				   bond_dev->name, slave_dev->name);
	}

	/* Inform AD package of unbinding of slave. */
	if (bond->params.mode == BOND_MODE_8023AD) {
		/* must be called before the slave is
		 * detached from the list
		 */
		bond_3ad_unbind_slave(slave);
	}

	pr_info("%s: releasing %s interface %s\n",
		bond_dev->name,
		bond_is_active_slave(slave) ? "active" : "backup",
		slave_dev->name);

	oldcurrent = bond->curr_active_slave;

	bond->current_arp_slave = NULL;

	/* release the slave from its bond */
	bond_detach_slave(bond, slave);

	if (bond->primary_slave == slave)
		bond->primary_slave = NULL;

	if (oldcurrent == slave)
		bond_change_active_slave(bond, NULL);

	if (bond_is_lb(bond)) {
		/* Must be called only after the slave has been
		 * detached from the list and the curr_active_slave
		 * has been cleared (if our_slave == old_current),
		 * but before a new active slave is selected.
		 */
		write_unlock_bh(&bond->lock);
		bond_alb_deinit_slave(bond, slave);
		write_lock_bh(&bond->lock);
	}

	if (oldcurrent == slave) {
		/*
		 * Note that we hold RTNL over this sequence, so there
		 * is no concern that another slave add/remove event
		 * will interfere.
		 */
		write_unlock_bh(&bond->lock);
		read_lock(&bond->lock);
		write_lock_bh(&bond->curr_slave_lock);

		bond_select_active_slave(bond);

		write_unlock_bh(&bond->curr_slave_lock);
		read_unlock(&bond->lock);
		write_lock_bh(&bond->lock);
	}

	if (bond->slave_cnt == 0) {
		bond_set_carrier(bond);

		/* if the last slave was removed, zero the mac address
		 * of the master so it will be set by the application
		 * to the mac address of the first slave
		 */
		memset(bond_dev->dev_addr, 0, bond_dev->addr_len);

		if (bond_vlan_used(bond)) {
			pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
				   bond_dev->name, bond_dev->name);
			pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
				   bond_dev->name);
		}
	}

	write_unlock_bh(&bond->lock);
	unblock_netpoll_tx();

	if (bond->slave_cnt == 0)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);

	bond_compute_features(bond);
	if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
	    (old_features & NETIF_F_VLAN_CHALLENGED))
		pr_info("%s: last VLAN challenged slave %s left bond %s. VLAN blocking is removed\n",
			bond_dev->name, slave_dev->name, bond_dev->name);

	/* must do this from outside any spinlocks */
	bond_destroy_slave_symlinks(bond_dev, slave_dev);

	bond_del_vlans_from_slave(bond, slave_dev);

	/* If the mode USES_PRIMARY, then we should only remove its
	 * promisc and mc settings if it was the curr_active_slave, but that was
	 * already taken care of above when we detached the slave
	 */
	if (!USES_PRIMARY(bond->params.mode)) {
		/* unset promiscuity level from slave */
		if (bond_dev->flags & IFF_PROMISC)
			dev_set_promiscuity(slave_dev, -1);

		/* unset allmulti level from slave */
		if (bond_dev->flags & IFF_ALLMULTI)
			dev_set_allmulti(slave_dev, -1);

		/* flush master's mc_list from slave */
		netif_addr_lock_bh(bond_dev);
		bond_mc_list_flush(bond_dev, slave_dev);
		netif_addr_unlock_bh(bond_dev);
	}

	netdev_set_bond_master(slave_dev, NULL);

	slave_disable_netpoll(slave);

	/* close slave before restoring its mac address */
	dev_close(slave_dev);

	if (bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
		/* restore original ("permanent") mac address */
		memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
		addr.sa_family = slave_dev->type;
		dev_set_mac_address(slave_dev, &addr);
	}

	dev_set_mtu(slave_dev, slave->original_mtu);

	slave_dev->priv_flags &= ~IFF_BONDING;

	kfree(slave);

	return 0;  /* deletion OK */
}

/*
* First release a slave and then destroy the bond if no more slaves are left.
* Must be under rtnl_lock when this function is called.
*/
static int  bond_release_and_destroy(struct net_device *bond_dev,
				     struct net_device *slave_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	int ret;

	ret = bond_release(bond_dev, slave_dev);
	if ((ret == 0) && (bond->slave_cnt == 0)) {
		bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
		pr_info("%s: destroying bond %s.\n",
			bond_dev->name, bond_dev->name);
		unregister_netdevice(bond_dev);
	}
	return ret;
}

/*
 * This function releases all slaves.
 */
static int bond_release_all(struct net_device *bond_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave;
	struct net_device *slave_dev;
	struct sockaddr addr;

	write_lock_bh(&bond->lock);

	netif_carrier_off(bond_dev);

	if (bond->slave_cnt == 0)
		goto out;

	bond->current_arp_slave = NULL;
	bond->primary_slave = NULL;
	bond_change_active_slave(bond, NULL);

	while ((slave = bond->first_slave) != NULL) {
		/* Inform AD package of unbinding of slave
		 * before slave is detached from the list.
		 */
		if (bond->params.mode == BOND_MODE_8023AD)
			bond_3ad_unbind_slave(slave);

		slave_dev = slave->dev;
		bond_detach_slave(bond, slave);

		/* now that the slave is detached, unlock and perform
		 * all the undo steps that should not be called from
		 * within a lock.
		 */
		write_unlock_bh(&bond->lock);

		/* unregister rx_handler early so bond_handle_frame wouldn't
		 * be called for this slave anymore.
		 */
		netdev_rx_handler_unregister(slave_dev);
		synchronize_net();

		if (bond_is_lb(bond)) {
			/* must be called only after the slave
			 * has been detached from the list
			 */
			bond_alb_deinit_slave(bond, slave);
		}

		bond_destroy_slave_symlinks(bond_dev, slave_dev);
		bond_del_vlans_from_slave(bond, slave_dev);

		/* If the mode USES_PRIMARY, then we should only remove its
		 * promisc and mc settings if it was the curr_active_slave, but that was
		 * already taken care of above when we detached the slave
		 */
		if (!USES_PRIMARY(bond->params.mode)) {
			/* unset promiscuity level from slave */
			if (bond_dev->flags & IFF_PROMISC)
				dev_set_promiscuity(slave_dev, -1);

			/* unset allmulti level from slave */
			if (bond_dev->flags & IFF_ALLMULTI)
				dev_set_allmulti(slave_dev, -1);

			/* flush master's mc_list from slave */
			netif_addr_lock_bh(bond_dev);
			bond_mc_list_flush(bond_dev, slave_dev);
			netif_addr_unlock_bh(bond_dev);
		}

		netdev_set_bond_master(slave_dev, NULL);

		slave_disable_netpoll(slave);

		/* close slave before restoring its mac address */
		dev_close(slave_dev);

		if (!bond->params.fail_over_mac) {
			/* restore original ("permanent") mac address*/
			memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
			addr.sa_family = slave_dev->type;
			dev_set_mac_address(slave_dev, &addr);
		}

		kfree(slave);

		/* re-acquire the lock before getting the next slave */
		write_lock_bh(&bond->lock);
	}

	/* zero the mac address of the master so it will be
	 * set by the application to the mac address of the
	 * first slave
	 */
	memset(bond_dev->dev_addr, 0, bond_dev->addr_len);

	if (bond_vlan_used(bond)) {
		pr_warning("%s: Warning: clearing HW address of %s while it still has VLANs.\n",
			   bond_dev->name, bond_dev->name);
		pr_warning("%s: When re-adding slaves, make sure the bond's HW address matches its VLANs'.\n",
			   bond_dev->name);
	}

	pr_info("%s: released all slaves\n", bond_dev->name);

out:
	write_unlock_bh(&bond->lock);

	bond_compute_features(bond);

	return 0;
}

/*
 * This function changes the active slave to slave <slave_dev>.
 * It returns -EINVAL in the following cases.
 *  - <slave_dev> is not found in the list.
 *  - There is not active slave now.
 *  - <slave_dev> is already active.
 *  - The link state of <slave_dev> is not BOND_LINK_UP.
 *  - <slave_dev> is not running.
 * In these cases, this function does nothing.
 * In the other cases, current_slave pointer is changed and 0 is returned.
 */
static int bond_ioctl_change_active(struct net_device *bond_dev, struct net_device *slave_dev)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *old_active = NULL;
	struct slave *new_active = NULL;
	int res = 0;

	if (!USES_PRIMARY(bond->params.mode))
		return -EINVAL;

	/* Verify that master_dev is indeed the master of slave_dev */
	if (!(slave_dev->flags & IFF_SLAVE) || (slave_dev->master != bond_dev))
		return -EINVAL;

	read_lock(&bond->lock);

	read_lock(&bond->curr_slave_lock);
	old_active = bond->curr_active_slave;
	read_unlock(&bond->curr_slave_lock);

	new_active = bond_get_slave_by_dev(bond, slave_dev);

	/*
	 * Changing to the current active: do nothing; return success.
	 */
	if (new_active && (new_active == old_active)) {
		read_unlock(&bond->lock);
		return 0;
	}

	if ((new_active) &&
	    (old_active) &&
	    (new_active->link == BOND_LINK_UP) &&
	    IS_UP(new_active->dev)) {
		block_netpoll_tx();
		write_lock_bh(&bond->curr_slave_lock);
		bond_change_active_slave(bond, new_active);
		write_unlock_bh(&bond->curr_slave_lock);
		unblock_netpoll_tx();
	} else
		res = -EINVAL;

	read_unlock(&bond->lock);

	return res;
}

static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
{
	struct bonding *bond = netdev_priv(bond_dev);

	info->bond_mode = bond->params.mode;
	info->miimon = bond->params.miimon;

	read_lock(&bond->lock);
	info->num_slaves = bond->slave_cnt;
	read_unlock(&bond->lock);

	return 0;
}

static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
{
	struct bonding *bond = netdev_priv(bond_dev);
	struct slave *slave;
	int i, res = -ENODEV;

	read_lock(&bond->lock);

	bond_for_each_slave(bond, slave, i) {
		if (i == (int)info->slave_id) {
			res = 0;
			strcpy(info->slave_name, slave->dev->name);
			info->link = slave->link;
			info->state = bond_slave_state(slave);
			info->link_failure_count = slave->link_failure_count;
			break;
		}
	}

	read_unlock(&bond->lock);

	return res;
}

/*-------------------------------- Monitoring -------------------------------*/


static int bond_miimon_inspect(struct bonding *bond)
{
	struct slave *slave;
	int i, link_state, commit = 0;
	bool ignore_updelay;

	ignore_updelay = !bond->curr_active_slave ? true : false;

	bond_for_each_slave(bond, slave, i) {
		slave->new_link = BOND_LINK_NOCHANGE;

		link_state = bond_check_dev_link(bond, slave->dev, 0);

		switch (slave->link) {
		case BOND_LINK_UP:
			if (link_state)
				continue;

			slave->link = BOND_LINK_FAIL;
			slave->delay = bond->params.downdelay;
			if (slave->delay) {
				pr_info("%s: link status down for %sinterface %s, disabling it in %d ms.\n",
					bond->dev->name,
					(bond->params.mode ==
					 BOND_MODE_ACTIVEBACKUP) ?
					(bond_is_active_slave(slave) ?
					 "active " : "backup ") : "",
					slave->dev->name,
					bond->params.downdelay * bond->params.miimon);
			}
			/*FALLTHRU*/
		case BOND_LINK_FAIL:
			if (link_state) {
				/*
				 * recovered before downdelay expired
				 */
				slave->link = BOND_LINK_UP;
				slave->jiffies = jiffies;
				pr_info("%s: link status up again after %d ms for interface %s.\n",
					bond->dev->name,
					(bond->params.downdelay - slave->delay) *
					bond->params.miimon,
					slave->dev->name);
				continue;
			}

			if (slave->delay <= 0) {
				slave->new_link = BOND_LINK_DOWN;
				commit++;
				continue;
			}

			slave->delay--;
			break;

		case BOND_LINK_DOWN:
			if (!link_state)
				continue;

			slave->link = BOND_LINK_BACK;
			slave->delay = bond->params.updelay;

			if (slave->delay) {
				pr_info("%s: link status up for interface %s, enabling it in %d ms.\n",
					bond->dev->name, slave->dev->name,
					ignore_updelay ? 0 :
					bond->params.updelay *
					bond->params.miimon);
			}
			/*FALLTHRU*/
		case BOND_LINK_BACK:
			if (!link_state) {
				slave->link = BOND_LINK_DOWN;
				pr_info("%s: link status down again after %d ms for interface %s.\n",
					bond->dev->name,
					(bond->params.updelay - slave->delay) *
					bond->params.miimon,
					slave->dev->name);

				continue;
			}

			if (ignore_updelay)
				slave->delay = 0;

			if (slave->delay <= 0) {
				slave->new_link = BOND_LINK_UP;
				commit++;
				ignore_updelay = false;
				continue;
			}

			slave->delay--;
			break;
		}
	}

	return commit;
}

static void bond_miimon_commit(struct bonding *bond)
{
	struct slave *slave;
	int i;

	bond_for_each_slave(bond, slave, i) {
		switch (slave->new_link) {
		case BOND_LINK_NOCHANGE:
			continue;

		case BOND_LINK_UP:
			slave->link = BOND_LINK_UP;
			slave->jiffies = jiffies;

			if (bond->params.mode == BOND_MODE_8023AD) {
				/* prevent it from being the active one */
				bond_set_backup_slave(slave);
			} else if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
				/* make it immediately active */
				bond_set_active_slave(slave);
			} else if (slave != bond->primary_slave) {
				/* prevent it from being the active one */
				bond_set_backup_slave(slave);
			}

			bond_update_speed_duplex(slave);

			pr_info("%s: link status definitely up for interface %s, %u Mbps %s duplex.\n",
				bond->dev->name, slave->dev->name,
				slave->speed, slave->duplex ? "full" : "half");

			/* notify ad that the link status has changed */
			if (bond->params.mode == BOND_MODE_8023AD)
				bond_3ad_handle_link_change(slave, BOND_LINK_UP);

			if (bond_is_lb(bond))
				bond_alb_handle_link_change(bond, slave,
							    BOND_LINK_UP);

			if (!bond->curr_active_slave ||
			    (slave == bond->primary_slave))
				goto do_failover;

			continue;

		case BOND_LINK_DOWN:
			if (slave->link_failure_count < UINT_MAX)
				slave->link_failure_count++;

			slave->link = BOND_LINK_DOWN;

			if (bond->params.mode == BOND_MODE_ACTIVEBACKUP ||
			    bond->params.mode == BOND_MODE_8023AD)
				bond_set_slave_inactive_flags(slave);

			pr_info("%s: link status definitely down for interface %s, disabling it\n",
				bond->dev->name, slave->dev->name);

			if (bond->params.mode == BOND_MODE_8023AD)
				bond_3ad_handle_link_change(slave,
							    BOND_LINK_DOWN);

			if (bond_is_lb(bond))
				bond_alb_handle_link_change(bond, slave,
							    BOND_LINK_DOWN);

			if (slave == bond->curr_active_slave)
				goto do_failover;

			continue;

		default:
			pr_err("%s: invalid new link %d on slave %s\n",
			       bond->dev->name, slave->new_link,
			       slave->dev->name);
			slave->new_link = BOND_LINK_NOCHANGE;

			continue;
		}

do_failover:
		ASSERT_RTNL();
		block_netpoll_tx();
		write_lock_bh(&bond->curr_slave_lock);
		bond_select_active_slave(bond);
		write_unlock_bh(&bond->curr_slave_lock);
		unblock_netpoll_tx();
	}

	bond_set_carrier(bond);
}

/*
 * bond_mii_monitor
 *
 * Really a wrapper that splits the mii monitor into two phases: an
 * inspection, then (if inspection indicates something needs to be done)
 * an acquisition of appropriate locks followed by a commit phase to
 * implement whatever link state changes are indicated.
 */
void bond_mii_monitor(struct work_struct *work)
{
	struct bonding *bond = container_of(work, struct bonding,
					    mii_work.work);
	bool should_notify_peers = false;
	unsigned long delay;

	read_lock(&bond->lock);

	delay = msecs_to_jiffies(bond->params.miimon);

	if (bond->slave_cnt == 0)
		goto re_arm;

	should_notify_peers = bond_should_notify_peers(bond);

	if (bond_miimon_inspect(bond)) {
		read_unlock(&bond->lock);

		/* Race avoidance with bond_close cancel of workqueue */
		if (!rtnl_trylock()) {
			read_lock(&bond->lock);
			delay = 1;
			should_notify_peers = false;
			goto re_arm;
		}

		read_lock(&bond->lock);

		bond_miimon_commit(bond);

		read_unlock(&bond->lock);
		rtnl_unlock();	/* might sleep, hold no other locks */
		read_lock(&bond->lock);
	}

re_arm:
	if (bond->params.miimon)
		queue_delayed_work(bond->wq, &bond->mii_work, delay);

	read_unlock(&bond->lock);

	if (should_notify_peers) {
		if (!rtnl_trylock()) {
			read_lock(&bond->lock);
			bond->send_peer_notif++;
			read_unlock(&bond->lock);
			return;
		}
		netdev_bonding_change(bond->dev, NETDEV_NOTIFY_PEERS);
		rtnl_unlock();
	}
}

static int bond_has_this_ip(struct bonding *bond, __be32 ip)
{
	struct vlan_entry *vlan;
	struct net_device *vlan_dev;

	if (ip == bond_confirm_addr(bond->dev, 0, ip))
		return 1;

	list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
		rcu_read_lock();
		vlan_dev = __vlan_find_dev_deep(bond->dev, vlan->vlan_id);
		rcu_read_unlock();
		if (vlan_dev && ip == bond_confirm_addr(vlan_dev, 0, ip))
			return 1;
	}

	return 0;
}

/*
 * We go to the (large) trouble of VLAN tagging ARP frames because
 * switches in VLAN mode (especially if ports are configured as
 * "native" to a VLAN) might not pass non-tagged frames.
 */
static void bond_arp_send(struct net_device *slave_dev, int arp_op, __be32 dest_ip, __be32 src_ip, unsigned short vlan_id)
{
	struct sk_buff *skb;

	pr_debug("arp %d on slave %s: dst %x src %x vid %d\n", arp_op,
		 slave_dev->name, dest_ip, src_ip, vlan_id);

	skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
			 NULL, slave_dev->dev_addr, NULL);

	if (!skb) {
		pr_err("ARP packet allocation failed\n");
		return;
	}
	if (vlan_id) {
		skb = vlan_put_tag(skb, vlan_id);
		if (!skb) {
			pr_err("failed to insert VLAN tag\n");
			return;
		}
	}
	arp_xmit(skb);
}


static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
{
	int i, vlan_id;
	__be32 *targets = bond->params.arp_targets;
	struct vlan_entry *vlan;
	struct net_device *vlan_dev = NULL;
	struct rtable *rt;

	for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
		__be32 addr;
		if (!targets[i])
			break;
		pr_debug("basa: target %x\n", targets[i]);
		if (!bond_vlan_used(bond)) {
			pr_debug("basa: empty vlan: arp_send\n");
			addr = bond_confirm_addr(bond->dev, targets[i], 0);
			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
				      addr, 0);
			continue;
		}

		/*
		 * If VLANs are configured, we do a route lookup to
		 * determine which VLAN interface would be used, so we
		 * can tag the ARP with the proper VLAN tag.
		 */
		rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
				     RTO_ONLINK, 0);
		if (IS_ERR(rt)) {
			if (net_ratelimit()) {
				pr_warning("%s: no route to arp_ip_target %pI4\n",
					   bond->dev->name, &targets[i]);
			}
			continue;
		}

		/*
		 * This target is not on a VLAN
		 */
		if (rt->dst.dev == bond->dev) {
			ip_rt_put(rt);
			pr_debug("basa: rtdev == bond->dev: arp_send\n");
			addr = bond_confirm_addr(bond->dev, targets[i], 0);
			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
				      addr, 0);
			continue;
		}

		vlan_id = 0;
		list_for_each_entry(vlan, &bond->vlan_list, vlan_list) {
			rcu_read_lock();
			vlan_dev = __vlan_find_dev_deep(bond->dev,
							vlan->vlan_id);
			rcu_read_unlock();
			if (vlan_dev == rt->dst.dev) {
				vlan_id = vlan->vlan_id;
				pr_debug("basa: vlan match on %s %d\n",
				       vlan_dev->name, vlan_id);
				break;
			}
		}

		if (vlan_id && vlan_dev) {
			ip_rt_put(rt);
			addr = bond_confirm_addr(vlan_dev, targets[i], 0);
			bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
				      addr, vlan_id);
			continue;
		}

		if (net_ratelimit()) {
			pr_warning("%s: no path to arp_ip_target %pI4 via rt.dev %s\n",
				   bond->dev->name, &targets[i],
				   rt->dst.dev ? rt->dst.dev->name : "NULL");
		}
		ip_rt_put(rt);
	}
}

static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
{
	int i;
	__be32 *targets = bond->params.arp_targets;

	for (i = 0; (i < BOND_MAX_ARP_TARGETS) && targets[i]; i++) {
		pr_debug("bva: sip %pI4 tip %pI4 t[%d] %pI4 bhti(tip) %d\n",
			 &sip, &tip, i, &targets[i],
			 bond_has_this_ip(bond, tip));
		if (sip == targets[i]) {
			if (bond_has_this_ip(bond, tip))
				slave->last_arp_rx = jiffies;
			return;
		}
	}
}

static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
			struct slave *slave)
{
	struct arphdr *arp = (struct arphdr *)skb->data;
	unsigned char *arp_ptr;
	__be32 sip, tip;
	int alen;

	if (skb->protocol != __cpu_to_be16(ETH_P_ARP))
		return RX_HANDLER_ANOTHER;

	read_lock(&bond->lock);
	alen = arp_hdr_len(bond->dev);

	pr_debug("bond_arp_rcv: bond %s skb->dev %s\n",
		 bond->dev->name, skb->dev->name);

	if (alen > skb_headlen(skb)) {
		arp = kmalloc(alen, GFP_ATOMIC);
		if (!arp)
			goto out_unlock;
		if (skb_copy_bits(skb, 0, arp, alen) < 0)
			goto out_unlock;
	}

	if (arp->ar_hln != bond->dev->addr_len ||
	    skb->pkt_type == PACKET_OTHERHOST ||
	    skb->pkt_type == PACKET_LOOPBACK ||
	    arp->ar_hrd != htons(ARPHRD_ETHER) ||
	    arp->ar_pro != htons(ETH_P_IP) ||
	    arp->ar_pln != 4)
		goto out_unlock;

	arp_ptr = (unsigned char *)(arp + 1);
	arp_ptr += bond->dev->addr_len;
	memcpy(&sip, arp_ptr, 4);
	arp_ptr += 4 + bond->dev->addr_len;
	memcpy(&tip, arp_ptr, 4);

	pr_debug("bond_arp_rcv: %s %s/%d av %d sv %d sip %pI4 tip %pI4\n",
		 bond->dev->name, slave->dev->name, bond_slave_state(slave),
		 bond->params.arp_validate, slave_do_arp_validate(bond, slave),
		 &sip, &tip);

	/*
	 * Backup slaves won't see the ARP reply, but do come through
	 * here for each ARP probe (so we swap the sip/tip to validate
	 * the probe).  In a "redundant switch, common router" type of
	 * configuration, the ARP probe will (hopefully) travel from
	 * the active, through one switch, the router, then the other
	 * switch before reaching the backup.
	 */
	if (bond_is_active_slave(slave))
		bond_validate_arp(bond, slave, sip, tip);
	else
		bond_validate_arp(bond, slave, tip, sip);

out_unlock:
	read_unlock(&bond->lock);
	if (arp != (struct arphdr *)skb->data)
		kfree(arp);
	return RX_HANDLER_ANOTHER;
}

/*
 * this function is called regularly to monitor each slave's link
 * ensuring that traffic is being sent and received when arp monitoring
 * is used in load-balancing mode. if the adapter has been dormant, then an
 * arp is transmitted to generate traffic. see activebackup_arp_monitor for
 * arp monitoring in active backup mode.
 */
void bond_loadbalance_arp_mon(struct work_struct *work)
{
	struct bonding *bond = container_of(work, struct bonding,
					    arp_work.work);
	struct slave *slave, *oldcurrent;
	int do_failover = 0;
	int delta_in_ticks;
	int i;

	read_lock(&bond->lock);

	delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);

	if (bond->slave_cnt == 0)
		goto re_arm;

	read_lock(&bond->curr_slave_lock);
	oldcurrent = bond->curr_active_slave;
	read_unlock(&bond->curr_slave_lock);

	/* see if any of the previous devices are up now (i.e. they have
	 * xmt and rcv traffic). the curr_active_slave does not come into
	 * the picture unless it is null. also, slave->jiffies is not needed
	 * here because we send an arp on each slave and give a slave as
	 * long as it needs to get the tx/rx within the delta.
	 * TODO: what about up/down delay in arp mode? it wasn't here before
	 *       so it can wait
	 */
	bond_for_each_slave(bond, slave, i) {
		unsigned long trans_start = dev_trans_start(slave->dev);

		if (slave->link != BOND_LINK_UP) {
			if (time_in_range(jiffies,
				trans_start - delta_in_ticks,
				trans_start + delta_in_ticks) &&
			    time_in_range(jiffies,
				slave->dev->last_rx - delta_in_ticks,
				slave->dev->last_rx + delta_in_ticks)) {

				slave->link  = BOND_LINK_UP;
				bond_set_active_slave(slave);

				/* primary_slave has no meaning in round-robin
				 * mode. the window of a slave being up and
				 * curr_active_slave being null after enslaving
				 * is closed.
				 */
				if (!oldcurrent) {
					pr_info("%s: link status definitely up for interface %s, ",
						bond->dev->name,
						slave->dev->name);
					do_failover = 1;
				} else {
					pr_info("%s: interface %s is now up\n",
						bond->dev->name,
						slave->dev->name);
				}
			}
		} else {
			/* slave->link == BOND_LINK_UP */

			/* not all switches will respond to an arp request
			 * when the source ip is 0, so don't take the link down
			 * if we don't know our ip yet
			 */
			if (!time_in_range(jiffies,
				trans_start - delta_in_ticks,
				trans_start + 2 * delta_in_ticks) ||
			    !time_in_range(jiffies,
				slave->dev->last_rx - delta_in_ticks,
				slave->dev->last_rx + 2 * delta_in_ticks)) {

				slave->link  = BOND_LINK_DOWN;
				bond_set_backup_slave(slave);

				if (slave->link_failure_count < UINT_MAX)
					slave->link_failure_count++;

				pr_info("%s: interface %s is now down.\n",
					bond->dev->name,
					slave->dev->name);

				if (slave == oldcurrent)
					do_failover = 1;
			}
		}

		/* note: if switch is in round-robin mode, all links
		 * must tx arp to ensure all links rx an arp - otherwise
		 * links may oscillate or not come up at all; if switch is
		 * in something like xor mode, there is nothing we can
		 * do - all replies will be rx'ed on same link causing slaves
		 * to be unstable during low/no traffic periods
		 */
		if (IS_UP(slave->dev))
			bond_arp_send_all(bond, slave);
	}

	if (do_failover) {
		block_netpoll_tx();
		write_lock_bh(&bond->curr_slave_lock);

		bond_select_active_slave(bond);

		write_unlock_bh(&bond->curr_slave_lock);
		unblock_netpoll_tx();
	}

re_arm:
	if (bond->params.arp_interval)
		queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);

	read_unlock(&bond->lock);
}

/*
 * Called to inspect slaves for active-backup mode ARP monitor link state
 * changes.  Sets new_link in slaves to specify what action should take
 * place for the slave.  Returns 0 if no changes are found, >0 if changes
 * to link states must be committed.
 *
 * Called with bond->lock held for read.
 */
static int bond_ab_arp_inspect(struct bonding *bond, int delta_in_ticks)
{
	struct slave *slave;
	int i, commit = 0;
	unsigned long trans_start;

	bond_for_each_slave(bond, slave, i) {
		slave->new_link = BOND_LINK_NOCHANGE;

		if (slave->link != BOND_LINK_UP) {
			if (time_in_range(jiffies,
				slave_last_rx(bond, slave) - delta_in_ticks,
				slave_last_rx(bond, slave) + delta_in_ticks)) {

				slave->new_link = BOND_LINK_UP;
				commit++;
			}

			continue;
		}

		/*
		 * Give slaves 2*delta after being enslaved or made
		 * active.  This avoids bouncing, as the last receive
		 * times need a full ARP monitor cycle to be updated.
		 */
		if (time_in_range(jiffies,
				  slave->jiffies - delta_in_ticks,
				  slave->jiffies + 2 * delta_in_ticks))
			continue;

		/*
		 * Backup slave is down if:
		 * - No current_arp_slave AND
		 * - more than 3*delta since last receive AND
		 * - the bond has an IP address
		 *
		 * Note: a non-null current_arp_slave indicates
		 * the curr_active_slave went down and we are
		 * searching for a new one; under this condition
		 * we only take the curr_active_slave down - this
		 * gives each slave a chance to tx/rx traffic
		 * before being taken out
		 */
		if (!bond_is_active_slave(slave) &&
		    !bond->current_arp_slave &&
		    !time_in_range(jiffies,
			slave_last_rx(bond, slave) - delta_in_ticks,
			slave_last_rx(bond, slave) + 3 * delta_in_ticks)) {

			slave->new_link = BOND_LINK_DOWN;
			commit++;
		}

		/*
		 * Active slave is down if:
		 * - more than 2*delta since transmitting OR
		 * - (more than 2*delta since receive AND
		 *    the bond has an IP address)
		 */
		trans_start = dev_trans_start(slave->dev);
		if (bond_is_active_slave(slave) &&
		    (!time_in_range(jiffies,
			trans_start - delta_in_ticks,
			trans_start + 2 * delta_in_ticks) ||
		     !time_in_range(jiffies,
			slave_last_rx(bond, slave) - delta_in_ticks,
			slave_last_rx(bond, slave) + 2 * delta_in_ticks))) {

			slave->new_link = BOND_LINK_DOWN;
			commit++;
		}
	}

	return commit;
}

/*
 * Called to commit link state changes noted by inspection step of
 * active-backup mode ARP monitor.
 *
 * Called with RTNL and bond->lock for read.
 */
static void bond_ab_arp_commit(struct bonding *bond, int delta_in_ticks)
{
	struct slave *slave;
	int i;
	unsigned long trans_start;

	bond_for_each_slave(bond, slave, i) {
		switch (slave->new_link) {
		case BOND_LINK_NOCHANGE:
			continue;

		case BOND_LINK_UP:
			trans_start = dev_trans_start(slave->dev);
			if ((!bond->curr_active_slave &&
			     time_in_range(jiffies,
					   trans_start - delta_in_ticks,
					   trans_start + delta_in_ticks)) ||
			    bond->curr_active_slave != slave) {
				slave->link = BOND_LINK_UP;
				if (bond->current_arp_slave) {
					bond_set_slave_inactive_flags(
						bond->current_arp_slave);
					bond->current_arp_slave = NULL;
				}

				pr_info("%s: link status definitely up for interface %s.\n",
					bond->dev->name, slave->dev->name);

				if (!bond->curr_active_slave ||
				    (slave == bond->primary_slave))
					goto do_failover;

			}

			continue;

		case BOND_LINK_DOWN:
			if (slave->link_failure_count < UINT_MAX)
				slave->link_failure_count++;

			slave->link = BOND_LINK_DOWN;
			bond_set_slave_inactive_flags(slave);

			pr_info("%s: link status definitely down for interface %s, disabling it\n",
				bond->dev->name, slave->dev->name);

			if (slave == bond->curr_active_slave) {
				bond->current_arp_slave = NULL;
				goto do_failover;
			}

			continue;

		default:
			pr_err("%s: impossible: new_link %d on slave %s\n",
			       bond->dev->name, slave->new_link,
			       slave->dev->name);
			continue;
		}

do_failover:
		ASSERT_RTNL();
		block_netpoll_tx();
	Commit message (Collapse)	Author	Age	Files	Lines
*	[client] introduce branding, --dump and --pack	Jonathan Bauer	2019-01-31	3	-7/+8
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Application name, service name, master server endpoints, documentation websites needed to be configurable to allow for an easy rebranding of the suite. Two new options allow this: use '--dump <folder>' to dump the jar's configurable files into that folder. Aside from text templates in 'txt', logos and icons in 'img', the 'branding.properties' file contains: * masterserver.address : self-explanatory * application.name : name to be shown on graphical elements like the main window * service.name : name to be used as a prefix for formulation like 'bwLehrpool-Team' or 'bwLehrpool-System' etc * service.faq.website : link to FAQ website * service.email : support contact address Once edited, the whole folder can be integrated into the Suite with '--pack <folder> <new_jar>'. The path to the new jar is then the rebranded version of the suite.
*	[client] Fix stuff FindBugs complained about	Simon Rettberg	2018-06-27	2	-15/+11
\|
*	[client] Move ResourceLoader back to dozmod client	Simon Rettberg	2018-06-26	2	-1/+176
\|
*	[client] Sanitize class/var names, split up control package	Simon Rettberg	2018-06-21	2	-6/+6
\| \| \| \| \| \| \|	All configurators have moved from .control to .configurator *.control should be used for simple controls that feel like they're really just one thing. The configurators are more like a group of controls.
*	[client] Refactor change monitor classes, better error message handling	Simon Rettberg	2018-06-21	1	-1/+18
\|
*	[client] Add GUI change handling classes	Simon Rettberg	2018-06-20	1	-12/+20
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Code to track if a dialog contains modified controls has been messy, error prone and all over the place. Adding a control to a dialog required adding multiple fields to the dialog class and adding new code in multiple places. This is an approach to create a centralized facility that would only require adding all controls of a dialog to the monitor in one place, and then defining a callback to get informed when the validity or content of the whole form changes. The monitor class will also remember the original state of the dialog, so you can tell if the user undoes their changes manually.
*	update imports of ResourceLoader	Jonathan Bauer	2018-04-27	2	-167/+1
\| \| \| \|	and removed the class and dep in pom.xml
*	fix broken links on some desktop	Jonathan Bauer	2018-04-26	2	-24/+56
\| \| \| \| \| \| \|	Introduce OSHelper class that should be used when trying to detect the type of OS we are on. This is now used when deciding the path to save the config to and when trying to execute the fallback command if opening the link via java's desktop API fails.
*	[client] Remove dead code	Simon Rettberg	2018-04-24	1	-13/+0
\|
*	[client] Use TConst virtualizer constants	Simon Rettberg	2018-04-24	1	-1/+2
\|
*	[client] Minor cleanups, add/remove TODOs, rename vars, ...	Simon Rettberg	2018-04-16	1	-12/+10
\|
*	[client] Reduce assigned RAM for downloaded VMs; had some OOMs on Win10	Simon Rettberg	2018-04-16	1	-1/+1
\|
*	[*] Add virtualbox support	Victor Mocanu	2018-04-16	1	-28/+52
\|
*	[client/server] remove GUEST_USER from netshares	Jonathan Bauer	2017-09-07	1	-3/+1
\| \| \| \| \| \| \|	* added some sanity checks before adding a new network share in the table * added user feedback error message for invalid input * fixed text fields growing/shrinking depending on input
*	[client/server] network share feature [WIP]	Jonathan Bauer	2017-09-06	1	-0/+22
\|
*	[client] Update apache httpclient, pass custom client to ecp-client-lean	Simon Rettberg	2017-08-09	1	-11/+118
\|
*	[client] Flip logging around, small delay to sync	Simon Rettberg	2017-08-01	1	-2/+5
\|
*	[client] Async remote version info fetching	Simon Rettberg	2017-08-01	1	-41/+45
\|
*	[client] Try thrift and https to master before deciding to skip proxy setup	Simon Rettberg	2017-07-31	1	-3/+31
\|
*	[client] Call .applySettingsForLocalEdit() after downloading a VM	Simon Rettberg	2016-10-05	1	-0/+1
\|
*	[client] Enable USB in vmx after VM download	Simon Rettberg	2016-09-20	1	-0/+1
\|
*	[client] Add/fix several weblinks ->	Simon Rettberg	2016-09-19	1	-1/+2
\| \| \| \| \| \|	Add FAQ URL to 'About' menu Add 'Register' button to LoginWindow Fix registration URL when image publishing fails
*	[client] Update URLs to FAQ etc. (bwlehrpool.de)	Simon Rettberg	2016-09-19	1	-3/+3
\|
*	[client] die bwSuite!	Jonathan Bauer	2016-09-08	1	-1/+1
\|
*	[client] reworked buggy days left calculations	Jonathan Bauer	2016-08-17	1	-24/+14
\|
*	[client] first working draft for published images stuff	Jonathan Bauer	2016-04-27	2	-1/+14
\|
*	[client] Add cd-rom drives to downloaded machine	Simon Rettberg	2016-02-24	1	-0/+2
\|
*	[client] Add icons to lecture and image list buttons	Simon Rettberg	2016-02-02	1	-0/+38
\|
*	[client] Changed location selector from lists to tree selection	Jonathan Bauer	2016-01-21	1	-0/+13
\|
*	[client] Fix: always generate multiple of 4 values for VM RAM	Simon Rettberg	2015-11-23	1	-1/+1
\|
*	[client] Update vmware link to point to version 12, clean up vmware notice ↵	Simon Rettberg	2015-11-16	1	-2/+1
\| \| \| \|	window
*	[client] Make MapHelper null safe and do lectureCache refresh with ↵	Stephan Schwaer	2015-10-29	1	-1/+8
\| \| \| \|	QuickTimer after deleting image.
*	[client] Add two floppy drives to vmx of downloaded VM	Simon Rettberg	2015-10-27	1	-1/+20
\|
*	[client] ResourceLoader: Fix leak, add getStream()	Simon Rettberg	2015-10-27	1	-5/+13
\|
*	[client] Fixed NPE when opening links.	Stephan Schwaer	2015-10-05	1	-9/+9
\|
*	[client] Don't run proxy search if master server is reachable	Simon Rettberg	2015-09-28	1	-0/+21
\|
*	[client] Added window for opening webpage in browser if user is not ↵	Stephan Schwaer	2015-09-28	1	-1/+4
\| \| \| \|	registered for BwIDM.
*	[client] Disable login button while login is running; create legacy vmx if ↵	Simon Rettberg	2015-09-23	1	-7/+14
\| \| \| \|	server doesn't supply one
*	[client] ImageUpdateWiz: if updating version metadata failed, inform user	Jonathan Bauer	2015-09-16	1	-1/+0
\|
*	Merge branch 'v1.1' of git.openslx.org:openslx-ng/tutor-module into v1.1	Jonathan Bauer	2015-09-15	1	-1/+34
\|\
\| *	[client] Put real update url in place	Simon Rettberg	2015-09-15	1	-1/+1
\| \|
\| *	[client] Changelog creation mode	Simon Rettberg	2015-09-15	1	-0/+33
\| \|
* \|	[client] reworked german text	Jonathan Bauer	2015-09-15	1	-1/+1
\|/
*	[client] ClientVersion: changelog support. The JSON must now have a ↵	Jonathan Bauer	2015-09-14	1	-1/+16
\| \| \| \|	'changelog' element
*	[client] Version: fix manifest path	Jonathan Bauer	2015-09-14	1	-1/+2
\|
*	[client] Image/Lectures: only push metadata/permissions if they were changed	Jonathan Bauer	2015-09-11	1	-0/+41
\|
*	[*] Adapt to MSS changes	Simon Rettberg	2015-09-11	1	-1/+1
\|
*	[client] added "Expiring" column to versionTable and introduced ↵	Jonathan Bauer	2015-09-10	1	-1/+37
\| \| \| \|	FormatHelper.daysTil(<long_timestamp_in_millis>)
*	Renamed method in MSS	Simon Rettberg	2015-09-09	1	-1/+1
\|
*	[client] evaluate max memory of OS when generating vmx	Jonathan Bauer	2015-09-08	1	-2/+7
\|