[deliverable/linux.git] / include / net / bonding.h

/*
 * Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
 *
 * Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
 * NCM: Network and Communications Management, Inc.
 *
 * BUT, I'm the one who modified it for ethernet, so:
 * (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU Public License, incorporated herein by reference.
 *
 */

#ifndef _NET_BONDING_H
#define _NET_BONDING_H

#include <linux/timer.h>
#include <linux/proc_fs.h>
#include <linux/if_bonding.h>
#include <linux/cpumask.h>
#include <linux/in6.h>
#include <linux/netpoll.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/reciprocal_div.h>
#include <linux/if_link.h>

#include <net/bond_3ad.h>
#include <net/bond_alb.h>
#include <net/bond_options.h>

#define BOND_MAX_ARP_TARGETS	16

#define BOND_DEFAULT_MIIMON	100

#ifndef __long_aligned
#define __long_aligned __attribute__((aligned((sizeof(long)))))
#endif
/*
 * Less bad way to call ioctl from within the kernel; this needs to be
 * done some other way to get the call out of interrupt context.
 * Needs "ioctl" variable to be supplied by calling context.
 */
#define IOCTL(dev, arg, cmd) ({		\
	int res = 0;			\
	mm_segment_t fs = get_fs();	\
	set_fs(get_ds());		\
	res = ioctl(dev, arg, cmd);	\
	set_fs(fs);			\
	res; })

#define BOND_MODE(bond) ((bond)->params.mode)

/* slave list primitives */
#define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)

#define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))

/* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
#define bond_first_slave(bond) \
	(bond_has_slaves(bond) ? \
		netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
		NULL)
#define bond_last_slave(bond) \
	(bond_has_slaves(bond) ? \
		netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
		NULL)

/* Caller must have rcu_read_lock */
#define bond_first_slave_rcu(bond) \
	netdev_lower_get_first_private_rcu(bond->dev)

#define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
#define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))

/**
 * bond_for_each_slave - iterate over all slaves
 * @bond:	the bond holding this list
 * @pos:	current slave
 * @iter:	list_head * iterator
 *
 * Caller must hold RTNL
 */
#define bond_for_each_slave(bond, pos, iter) \
	netdev_for_each_lower_private((bond)->dev, pos, iter)

/* Caller must have rcu_read_lock */
#define bond_for_each_slave_rcu(bond, pos, iter) \
	netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)

#ifdef CONFIG_NET_POLL_CONTROLLER
extern atomic_t netpoll_block_tx;

static inline void block_netpoll_tx(void)
{
	atomic_inc(&netpoll_block_tx);
}

static inline void unblock_netpoll_tx(void)
{
	atomic_dec(&netpoll_block_tx);
}

static inline int is_netpoll_tx_blocked(struct net_device *dev)
{
	if (unlikely(netpoll_tx_running(dev)))
		return atomic_read(&netpoll_block_tx);
	return 0;
}
#else
#define block_netpoll_tx()
#define unblock_netpoll_tx()
#define is_netpoll_tx_blocked(dev) (0)
#endif

struct bond_params {
	int mode;
	int xmit_policy;
	int miimon;
	u8 num_peer_notif;
	int arp_interval;
	int arp_validate;
	int arp_all_targets;
	int use_carrier;
	int fail_over_mac;
	int updelay;
	int downdelay;
	int lacp_fast;
	unsigned int min_links;
	int ad_select;
	char primary[IFNAMSIZ];
	int primary_reselect;
	__be32 arp_targets[BOND_MAX_ARP_TARGETS];
	int tx_queues;
	int all_slaves_active;
	int resend_igmp;
	int lp_interval;
	int packets_per_slave;
	int tlb_dynamic_lb;
	struct reciprocal_value reciprocal_packets_per_slave;
	u16 ad_actor_sys_prio;
	u16 ad_user_port_key;

	/* 2 bytes of padding : see ether_addr_equal_64bits() */
	u8 ad_actor_system[ETH_ALEN + 2];
};

struct bond_parm_tbl {
	char *modename;
	int mode;
};

struct netdev_notify_work {
	struct delayed_work	work;
	struct net_device	*dev;
	struct netdev_bonding_info bonding_info;
};

struct slave {
	struct net_device *dev; /* first - useful for panic debug */
	struct bonding *bond; /* our master */
	int    delay;
	/* all three in jiffies */
	unsigned long last_link_up;
	unsigned long last_rx;
	unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
	s8     link;    /* one of BOND_LINK_XXXX */
	s8     new_link;
	u8     backup:1,   /* indicates backup slave. Value corresponds with
			      BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
	       inactive:1, /* indicates inactive slave */
	       should_notify:1, /* indicates whether the state changed */
	       should_notify_link:1; /* indicates whether the link changed */
	u8     duplex;
	u32    original_mtu;
	u32    link_failure_count;
	u32    speed;
	u16    queue_id;
	u8     perm_hwaddr[ETH_ALEN];
	struct ad_slave_info *ad_info;
	struct tlb_slave_info tlb_info;
#ifdef CONFIG_NET_POLL_CONTROLLER
	struct netpoll *np;
#endif
	struct kobject kobj;
	struct rtnl_link_stats64 slave_stats;
};

struct bond_up_slave {
	unsigned int	count;
	struct rcu_head rcu;
	struct slave	*arr[0];
};

/*
 * Link pseudo-state only used internally by monitors
 */
#define BOND_LINK_NOCHANGE -1

/*
 * Here are the locking policies for the two bonding locks:
 * Get rcu_read_lock when reading or RTNL when writing slave list.
 */
struct bonding {
	struct   net_device *dev; /* first - useful for panic debug */
	struct   slave __rcu *curr_active_slave;
	struct   slave __rcu *current_arp_slave;
	struct   slave __rcu *primary_slave;
	struct   bond_up_slave __rcu *slave_arr; /* Array of usable slaves */
	bool     force_primary;
	s32      slave_cnt; /* never change this value outside the attach/detach wrappers */
	int     (*recv_probe)(const struct sk_buff *, struct bonding *,
			      struct slave *);
	/* mode_lock is used for mode-specific locking needs, currently used by:
	 * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
	 *                bond_3ad_state_machine_handler() concurrently and also
	 *                the access to the state machine shared variables.
	 * TLB mode (5) - to sync the use and modifications of its hash table
	 * ALB mode (6) - to sync the use and modifications of its hash table
	 */
	spinlock_t mode_lock;
	spinlock_t stats_lock;
	u8	 send_peer_notif;
	u8       igmp_retrans;
#ifdef CONFIG_PROC_FS
	struct   proc_dir_entry *proc_entry;
	char     proc_file_name[IFNAMSIZ];
#endif /* CONFIG_PROC_FS */
	struct   list_head bond_list;
	u32      rr_tx_counter;
	struct   ad_bond_info ad_info;
	struct   alb_bond_info alb_info;
	struct   bond_params params;
	struct   workqueue_struct *wq;
	struct   delayed_work mii_work;
	struct   delayed_work arp_work;
	struct   delayed_work alb_work;
	struct   delayed_work ad_work;
	struct   delayed_work mcast_work;
	struct   delayed_work slave_arr_work;
#ifdef CONFIG_DEBUG_FS
	/* debugging support via debugfs */
	struct	 dentry *debug_dir;
#endif /* CONFIG_DEBUG_FS */
	struct rtnl_link_stats64 bond_stats;
};

#define bond_slave_get_rcu(dev) \
	((struct slave *) rcu_dereference(dev->rx_handler_data))

#define bond_slave_get_rtnl(dev) \
	((struct slave *) rtnl_dereference(dev->rx_handler_data))

void bond_queue_slave_event(struct slave *slave);
void bond_lower_state_changed(struct slave *slave);

struct bond_vlan_tag {
	__be16		vlan_proto;
	unsigned short	vlan_id;
};

/**
 * Returns NULL if the net_device does not belong to any of the bond's slaves
 *
 * Caller must hold bond lock for read
 */
static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
						  struct net_device *slave_dev)
{
	return netdev_lower_dev_get_private(bond->dev, slave_dev);
}

static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
{
	return slave->bond;
}

static inline bool bond_should_override_tx_queue(struct bonding *bond)
{
	return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
	       BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
}

static inline bool bond_is_lb(const struct bonding *bond)
{
	return BOND_MODE(bond) == BOND_MODE_TLB ||
	       BOND_MODE(bond) == BOND_MODE_ALB;
}

static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
{
	return (BOND_MODE(bond) == BOND_MODE_TLB)  &&
	       (bond->params.tlb_dynamic_lb == 0);
}

static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
{
	return (BOND_MODE(bond) == BOND_MODE_8023AD ||
		BOND_MODE(bond) == BOND_MODE_XOR ||
		bond_is_nondyn_tlb(bond));
}

static inline bool bond_mode_uses_arp(int mode)
{
	return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
	       mode != BOND_MODE_ALB;
}

static inline bool bond_mode_uses_primary(int mode)
{
	return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
	       mode == BOND_MODE_ALB;
}

static inline bool bond_uses_primary(struct bonding *bond)
{
	return bond_mode_uses_primary(BOND_MODE(bond));
}

static inline struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
{
	struct slave *slave = rcu_dereference(bond->curr_active_slave);

	return bond_uses_primary(bond) && slave ? slave->dev : NULL;
}

static inline bool bond_slave_is_up(struct slave *slave)
{
	return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
}

static inline void bond_set_active_slave(struct slave *slave)
{
	if (slave->backup) {
		slave->backup = 0;
		bond_queue_slave_event(slave);
		bond_lower_state_changed(slave);
		rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
	}
}

static inline void bond_set_backup_slave(struct slave *slave)
{
	if (!slave->backup) {
		slave->backup = 1;
		bond_queue_slave_event(slave);
		bond_lower_state_changed(slave);
		rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
	}
}

static inline void bond_set_slave_state(struct slave *slave,
					int slave_state, bool notify)
{
	if (slave->backup == slave_state)
		return;

	slave->backup = slave_state;
	if (notify) {
		bond_lower_state_changed(slave);
		rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
		bond_queue_slave_event(slave);
		slave->should_notify = 0;
	} else {
		if (slave->should_notify)
			slave->should_notify = 0;
		else
			slave->should_notify = 1;
	}
}

static inline void bond_slave_state_change(struct bonding *bond)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave(bond, tmp, iter) {
		if (tmp->link == BOND_LINK_UP)
			bond_set_active_slave(tmp);
		else if (tmp->link == BOND_LINK_DOWN)
			bond_set_backup_slave(tmp);
	}
}

static inline void bond_slave_state_notify(struct bonding *bond)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave(bond, tmp, iter) {
		if (tmp->should_notify) {
			bond_lower_state_changed(tmp);
			rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
			tmp->should_notify = 0;
		}
	}
}

static inline int bond_slave_state(struct slave *slave)
{
	return slave->backup;
}

static inline bool bond_is_active_slave(struct slave *slave)
{
	return !bond_slave_state(slave);
}

static inline bool bond_slave_can_tx(struct slave *slave)
{
	return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
	       bond_is_active_slave(slave);
}

#define BOND_PRI_RESELECT_ALWAYS	0
#define BOND_PRI_RESELECT_BETTER	1
#define BOND_PRI_RESELECT_FAILURE	2

#define BOND_FOM_NONE			0
#define BOND_FOM_ACTIVE			1
#define BOND_FOM_FOLLOW			2

#define BOND_ARP_TARGETS_ANY		0
#define BOND_ARP_TARGETS_ALL		1

#define BOND_ARP_VALIDATE_NONE		0
#define BOND_ARP_VALIDATE_ACTIVE	(1 << BOND_STATE_ACTIVE)
#define BOND_ARP_VALIDATE_BACKUP	(1 << BOND_STATE_BACKUP)
#define BOND_ARP_VALIDATE_ALL		(BOND_ARP_VALIDATE_ACTIVE | \
					 BOND_ARP_VALIDATE_BACKUP)
#define BOND_ARP_FILTER			(BOND_ARP_VALIDATE_ALL + 1)
#define BOND_ARP_FILTER_ACTIVE		(BOND_ARP_VALIDATE_ACTIVE | \
					 BOND_ARP_FILTER)
#define BOND_ARP_FILTER_BACKUP		(BOND_ARP_VALIDATE_BACKUP | \
					 BOND_ARP_FILTER)

#define BOND_SLAVE_NOTIFY_NOW		true
#define BOND_SLAVE_NOTIFY_LATER		false

static inline int slave_do_arp_validate(struct bonding *bond,
					struct slave *slave)
{
	return bond->params.arp_validate & (1 << bond_slave_state(slave));
}

static inline int slave_do_arp_validate_only(struct bonding *bond)
{
	return bond->params.arp_validate & BOND_ARP_FILTER;
}

static inline int bond_is_ip_target_ok(__be32 addr)
{
	return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
}

/* Get the oldest arp which we've received on this slave for bond's
 * arp_targets.
 */
static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
						       struct slave *slave)
{
	int i = 1;
	unsigned long ret = slave->target_last_arp_rx[0];

	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
		if (time_before(slave->target_last_arp_rx[i], ret))
			ret = slave->target_last_arp_rx[i];

	return ret;
}

static inline unsigned long slave_last_rx(struct bonding *bond,
					struct slave *slave)
{
	if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
		return slave_oldest_target_arp_rx(bond, slave);

	return slave->last_rx;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static inline void bond_netpoll_send_skb(const struct slave *slave,
					 struct sk_buff *skb)
{
	struct netpoll *np = slave->np;

	if (np)
		netpoll_send_skb(np, skb);
}
#else
static inline void bond_netpoll_send_skb(const struct slave *slave,
					 struct sk_buff *skb)
{
}
#endif

static inline void bond_set_slave_inactive_flags(struct slave *slave,
						 bool notify)
{
	if (!bond_is_lb(slave->bond))
		bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
	if (!slave->bond->params.all_slaves_active)
		slave->inactive = 1;
}

static inline void bond_set_slave_active_flags(struct slave *slave,
					       bool notify)
{
	bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
	slave->inactive = 0;
}

static inline bool bond_is_slave_inactive(struct slave *slave)
{
	return slave->inactive;
}

static inline void bond_set_slave_link_state(struct slave *slave, int state,
					     bool notify)
{
	if (slave->link == state)
		return;

	slave->link = state;
	if (notify) {
		bond_queue_slave_event(slave);
		bond_lower_state_changed(slave);
		slave->should_notify_link = 0;
	} else {
		if (slave->should_notify_link)
			slave->should_notify_link = 0;
		else
			slave->should_notify_link = 1;
	}
}

static inline void bond_slave_link_notify(struct bonding *bond)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave(bond, tmp, iter) {
		if (tmp->should_notify_link) {
			bond_queue_slave_event(tmp);
			bond_lower_state_changed(tmp);
			tmp->should_notify_link = 0;
		}
	}
}

static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
{
	struct in_device *in_dev;
	__be32 addr = 0;

	rcu_read_lock();
	in_dev = __in_dev_get_rcu(dev);

	if (in_dev)
		addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
					 RT_SCOPE_HOST);
	rcu_read_unlock();
	return addr;
}

struct bond_net {
	struct net		*net;	/* Associated network namespace */
	struct list_head	dev_list;
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry	*proc_dir;
#endif
	struct class_attribute	class_attr_bonding_masters;
};

int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
int bond_create(struct net *net, const char *name);
int bond_create_sysfs(struct bond_net *net);
void bond_destroy_sysfs(struct bond_net *net);
void bond_prepare_sysfs_group(struct bonding *bond);
int bond_sysfs_slave_add(struct slave *slave);
void bond_sysfs_slave_del(struct slave *slave);
int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
int bond_set_carrier(struct bonding *bond);
void bond_select_active_slave(struct bonding *bond);
void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
void bond_create_debugfs(void);
void bond_destroy_debugfs(void);
void bond_debug_register(struct bonding *bond);
void bond_debug_unregister(struct bonding *bond);
void bond_debug_reregister(struct bonding *bond);
const char *bond_mode_name(int mode);
void bond_setup(struct net_device *bond_dev);
unsigned int bond_get_num_tx_queues(void);
int bond_netlink_init(void);
void bond_netlink_fini(void);
struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
const char *bond_slave_link_status(s8 link);
struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
					      struct net_device *end_dev,
					      int level);
int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);

#ifdef CONFIG_PROC_FS
void bond_create_proc_entry(struct bonding *bond);
void bond_remove_proc_entry(struct bonding *bond);
void bond_create_proc_dir(struct bond_net *bn);
void bond_destroy_proc_dir(struct bond_net *bn);
#else
static inline void bond_create_proc_entry(struct bonding *bond)
{
}

static inline void bond_remove_proc_entry(struct bonding *bond)
{
}

static inline void bond_create_proc_dir(struct bond_net *bn)
{
}

static inline void bond_destroy_proc_dir(struct bond_net *bn)
{
}
#endif

static inline struct slave *bond_slave_has_mac(struct bonding *bond,
					       const u8 *mac)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave(bond, tmp, iter)
		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
			return tmp;

	return NULL;
}

/* Caller must hold rcu_read_lock() for read */
static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
					       const u8 *mac)
{
	struct list_head *iter;
	struct slave *tmp;

	bond_for_each_slave_rcu(bond, tmp, iter)
		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
			return tmp;

	return NULL;
}

/* Caller must hold rcu_read_lock() for read */
static inline bool bond_slave_has_mac_rx(struct bonding *bond, const u8 *mac)
{
	struct list_head *iter;
	struct slave *tmp;
	struct netdev_hw_addr *ha;

	bond_for_each_slave_rcu(bond, tmp, iter)
		if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
			return true;

	if (netdev_uc_empty(bond->dev))
		return false;

	netdev_for_each_uc_addr(ha, bond->dev)
		if (ether_addr_equal_64bits(mac, ha->addr))
			return true;

	return false;
}

/* Check if the ip is present in arp ip list, or first free slot if ip == 0
 * Returns -1 if not found, index if found
 */
static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
{
	int i;

	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
		if (targets[i] == ip)
			return i;
		else if (targets[i] == 0)
			break;

	return -1;
}

/* exported from bond_main.c */
extern int bond_net_id;
extern const struct bond_parm_tbl bond_lacp_tbl[];
extern const struct bond_parm_tbl xmit_hashtype_tbl[];
extern const struct bond_parm_tbl arp_validate_tbl[];
extern const struct bond_parm_tbl arp_all_targets_tbl[];
extern const struct bond_parm_tbl fail_over_mac_tbl[];
extern const struct bond_parm_tbl pri_reselect_tbl[];
extern struct bond_parm_tbl ad_select_tbl[];

/* exported from bond_netlink.c */
extern struct rtnl_link_ops bond_link_ops;

static inline void bond_tx_drop(struct net_device *dev, struct sk_buff *skb)
{
	atomic_long_inc(&dev->tx_dropped);
	dev_kfree_skb_any(skb);
}

#endif /* _NET_BONDING_H */
Commit	Line	Data
	1	/*
	2	* Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
	3	*
	4	* Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
	5	* NCM: Network and Communications Management, Inc.
	6	*
	7	* BUT, I'm the one who modified it for ethernet, so:
	8	* (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
	9	*
	10	* This software may be used and distributed according to the terms
	11	* of the GNU Public License, incorporated herein by reference.
	12	*
	13	*/
	14
	15	#ifndef _NET_BONDING_H
	16	#define _NET_BONDING_H
	17
	18	#include <linux/timer.h>
	19	#include <linux/proc_fs.h>
	20	#include <linux/if_bonding.h>
	21	#include <linux/cpumask.h>
	22	#include <linux/in6.h>
	23	#include <linux/netpoll.h>
	24	#include <linux/inetdevice.h>
	25	#include <linux/etherdevice.h>
	26	#include <linux/reciprocal_div.h>
	27	#include <linux/if_link.h>
	28
	29	#include <net/bond_3ad.h>
	30	#include <net/bond_alb.h>
	31	#include <net/bond_options.h>
	32
	33	#define BOND_MAX_ARP_TARGETS 16
	34
	35	#define BOND_DEFAULT_MIIMON 100
	36
	37	#ifndef __long_aligned
	38	#define __long_aligned __attribute__((aligned((sizeof(long)))))
	39	#endif
	40	/*
	41	* Less bad way to call ioctl from within the kernel; this needs to be
	42	* done some other way to get the call out of interrupt context.
	43	* Needs "ioctl" variable to be supplied by calling context.
	44	*/
	45	#define IOCTL(dev, arg, cmd) ({ \
	46	int res = 0; \
	47	mm_segment_t fs = get_fs(); \
	48	set_fs(get_ds()); \
	49	res = ioctl(dev, arg, cmd); \
	50	set_fs(fs); \
	51	res; })
	52
	53	#define BOND_MODE(bond) ((bond)->params.mode)
	54
	55	/* slave list primitives */
	56	#define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
	57
	58	#define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
	59
	60	/* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
	61	#define bond_first_slave(bond) \
	62	(bond_has_slaves(bond) ? \
	63	netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
	64	NULL)
	65	#define bond_last_slave(bond) \
	66	(bond_has_slaves(bond) ? \
	67	netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
	68	NULL)
	69
	70	/* Caller must have rcu_read_lock */
	71	#define bond_first_slave_rcu(bond) \
	72	netdev_lower_get_first_private_rcu(bond->dev)
	73
	74	#define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
	75	#define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
	76
	77	/**
	78	* bond_for_each_slave - iterate over all slaves
	79	* @bond: the bond holding this list
	80	* @pos: current slave
	81	* @iter: list_head * iterator
	82	*
	83	* Caller must hold RTNL
	84	*/
	85	#define bond_for_each_slave(bond, pos, iter) \
	86	netdev_for_each_lower_private((bond)->dev, pos, iter)
	87
	88	/* Caller must have rcu_read_lock */
	89	#define bond_for_each_slave_rcu(bond, pos, iter) \
	90	netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
	91
	92	#ifdef CONFIG_NET_POLL_CONTROLLER
	93	extern atomic_t netpoll_block_tx;
	94
	95	static inline void block_netpoll_tx(void)
	96	{
	97	atomic_inc(&netpoll_block_tx);
	98	}
	99
	100	static inline void unblock_netpoll_tx(void)
	101	{
	102	atomic_dec(&netpoll_block_tx);
	103	}
	104
	105	static inline int is_netpoll_tx_blocked(struct net_device *dev)
	106	{
	107	if (unlikely(netpoll_tx_running(dev)))
	108	return atomic_read(&netpoll_block_tx);
	109	return 0;
	110	}
	111	#else
	112	#define block_netpoll_tx()
	113	#define unblock_netpoll_tx()
	114	#define is_netpoll_tx_blocked(dev) (0)
	115	#endif
	116
	117	struct bond_params {
	118	int mode;
	119	int xmit_policy;
	120	int miimon;
	121	u8 num_peer_notif;
	122	int arp_interval;
	123	int arp_validate;
	124	int arp_all_targets;
	125	int use_carrier;
	126	int fail_over_mac;
	127	int updelay;
	128	int downdelay;
	129	int lacp_fast;
	130	unsigned int min_links;
	131	int ad_select;
	132	char primary[IFNAMSIZ];
	133	int primary_reselect;
	134	__be32 arp_targets[BOND_MAX_ARP_TARGETS];
	135	int tx_queues;
	136	int all_slaves_active;
	137	int resend_igmp;
	138	int lp_interval;
	139	int packets_per_slave;
	140	int tlb_dynamic_lb;
	141	struct reciprocal_value reciprocal_packets_per_slave;
	142	u16 ad_actor_sys_prio;
	143	u16 ad_user_port_key;
	144
	145	/* 2 bytes of padding : see ether_addr_equal_64bits() */
	146	u8 ad_actor_system[ETH_ALEN + 2];
	147	};
	148
	149	struct bond_parm_tbl {
	150	char *modename;
	151	int mode;
	152	};
	153
	154	struct netdev_notify_work {
	155	struct delayed_work work;
	156	struct net_device *dev;
	157	struct netdev_bonding_info bonding_info;
	158	};
	159
	160	struct slave {
	161	struct net_device dev; / first - useful for panic debug */
	162	struct bonding bond; / our master */
	163	int delay;
	164	/* all three in jiffies */
	165	unsigned long last_link_up;
	166	unsigned long last_rx;
	167	unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
	168	s8 link; /* one of BOND_LINK_XXXX */
	169	s8 new_link;
	170	u8 backup:1, /* indicates backup slave. Value corresponds with
	171	BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
	172	inactive:1, /* indicates inactive slave */
	173	should_notify:1, /* indicates whether the state changed */
	174	should_notify_link:1; /* indicates whether the link changed */
	175	u8 duplex;
	176	u32 original_mtu;
	177	u32 link_failure_count;
	178	u32 speed;
	179	u16 queue_id;
	180	u8 perm_hwaddr[ETH_ALEN];
	181	struct ad_slave_info *ad_info;
	182	struct tlb_slave_info tlb_info;
	183	#ifdef CONFIG_NET_POLL_CONTROLLER
	184	struct netpoll *np;
	185	#endif
	186	struct kobject kobj;
	187	struct rtnl_link_stats64 slave_stats;
	188	};
	189
	190	struct bond_up_slave {
	191	unsigned int count;
	192	struct rcu_head rcu;
	193	struct slave *arr[0];
	194	};
	195
	196	/*
	197	* Link pseudo-state only used internally by monitors
	198	*/
	199	#define BOND_LINK_NOCHANGE -1
	200
	201	/*
	202	* Here are the locking policies for the two bonding locks:
	203	* Get rcu_read_lock when reading or RTNL when writing slave list.
	204	*/
	205	struct bonding {
	206	struct net_device dev; / first - useful for panic debug */
	207	struct slave __rcu *curr_active_slave;
	208	struct slave __rcu *current_arp_slave;
	209	struct slave __rcu *primary_slave;
	210	struct bond_up_slave __rcu slave_arr; / Array of usable slaves */
	211	bool force_primary;
	212	s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
	213	int (recv_probe)(const struct sk_buff , struct bonding *,
	214	struct slave *);
	215	/* mode_lock is used for mode-specific locking needs, currently used by:
	216	* 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
	217	* bond_3ad_state_machine_handler() concurrently and also
	218	* the access to the state machine shared variables.
	219	* TLB mode (5) - to sync the use and modifications of its hash table
	220	* ALB mode (6) - to sync the use and modifications of its hash table
	221	*/
	222	spinlock_t mode_lock;
	223	spinlock_t stats_lock;
	224	u8 send_peer_notif;
	225	u8 igmp_retrans;
	226	#ifdef CONFIG_PROC_FS
	227	struct proc_dir_entry *proc_entry;
	228	char proc_file_name[IFNAMSIZ];
	229	#endif /* CONFIG_PROC_FS */
	230	struct list_head bond_list;
	231	u32 rr_tx_counter;
	232	struct ad_bond_info ad_info;
	233	struct alb_bond_info alb_info;
	234	struct bond_params params;
	235	struct workqueue_struct *wq;
	236	struct delayed_work mii_work;
	237	struct delayed_work arp_work;
	238	struct delayed_work alb_work;
	239	struct delayed_work ad_work;
	240	struct delayed_work mcast_work;
	241	struct delayed_work slave_arr_work;
	242	#ifdef CONFIG_DEBUG_FS
	243	/* debugging support via debugfs */
	244	struct dentry *debug_dir;
	245	#endif /* CONFIG_DEBUG_FS */
	246	struct rtnl_link_stats64 bond_stats;
	247	};
	248
	249	#define bond_slave_get_rcu(dev) \
	250	((struct slave *) rcu_dereference(dev->rx_handler_data))
	251
	252	#define bond_slave_get_rtnl(dev) \
	253	((struct slave *) rtnl_dereference(dev->rx_handler_data))
	254
	255	void bond_queue_slave_event(struct slave *slave);
	256	void bond_lower_state_changed(struct slave *slave);
	257
	258	struct bond_vlan_tag {
	259	__be16 vlan_proto;
	260	unsigned short vlan_id;
	261	};
	262
	263	/**
	264	* Returns NULL if the net_device does not belong to any of the bond's slaves
	265	*
	266	* Caller must hold bond lock for read
	267	*/
	268	static inline struct slave bond_get_slave_by_dev(struct bonding bond,
	269	struct net_device *slave_dev)
	270	{
	271	return netdev_lower_dev_get_private(bond->dev, slave_dev);
	272	}
	273
	274	static inline struct bonding bond_get_bond_by_slave(struct slave slave)
	275	{
	276	return slave->bond;
	277	}
	278
	279	static inline bool bond_should_override_tx_queue(struct bonding *bond)
	280	{
	281	return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP \|\|
	282	BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
	283	}
	284
	285	static inline bool bond_is_lb(const struct bonding *bond)
	286	{
	287	return BOND_MODE(bond) == BOND_MODE_TLB \|\|
	288	BOND_MODE(bond) == BOND_MODE_ALB;
	289	}
	290
	291	static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
	292	{
	293	return (BOND_MODE(bond) == BOND_MODE_TLB) &&
	294	(bond->params.tlb_dynamic_lb == 0);
	295	}
	296
	297	static inline bool bond_mode_uses_xmit_hash(const struct bonding *bond)
	298	{
	299	return (BOND_MODE(bond) == BOND_MODE_8023AD \|\|
	300	BOND_MODE(bond) == BOND_MODE_XOR \|\|
	301	bond_is_nondyn_tlb(bond));
	302	}
	303
	304	static inline bool bond_mode_uses_arp(int mode)
	305	{
	306	return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
	307	mode != BOND_MODE_ALB;
	308	}
	309
	310	static inline bool bond_mode_uses_primary(int mode)
	311	{
	312	return mode == BOND_MODE_ACTIVEBACKUP \|\| mode == BOND_MODE_TLB \|\|
	313	mode == BOND_MODE_ALB;
	314	}
	315
	316	static inline bool bond_uses_primary(struct bonding *bond)
	317	{
	318	return bond_mode_uses_primary(BOND_MODE(bond));
	319	}
	320
	321	static inline struct net_device bond_option_active_slave_get_rcu(struct bonding bond)
	322	{
	323	struct slave *slave = rcu_dereference(bond->curr_active_slave);
	324
	325	return bond_uses_primary(bond) && slave ? slave->dev : NULL;
	326	}
	327
	328	static inline bool bond_slave_is_up(struct slave *slave)
	329	{
	330	return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
	331	}
	332
	333	static inline void bond_set_active_slave(struct slave *slave)
	334	{
	335	if (slave->backup) {
	336	slave->backup = 0;
	337	bond_queue_slave_event(slave);
	338	bond_lower_state_changed(slave);
	339	rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
	340	}
	341	}
	342
	343	static inline void bond_set_backup_slave(struct slave *slave)
	344	{
	345	if (!slave->backup) {
	346	slave->backup = 1;
	347	bond_queue_slave_event(slave);
	348	bond_lower_state_changed(slave);
	349	rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
	350	}
	351	}
	352
	353	static inline void bond_set_slave_state(struct slave *slave,
	354	int slave_state, bool notify)
	355	{
	356	if (slave->backup == slave_state)
	357	return;
	358
	359	slave->backup = slave_state;
	360	if (notify) {
	361	bond_lower_state_changed(slave);
	362	rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
	363	bond_queue_slave_event(slave);
	364	slave->should_notify = 0;
	365	} else {
	366	if (slave->should_notify)
	367	slave->should_notify = 0;
	368	else
	369	slave->should_notify = 1;
	370	}
	371	}
	372
	373	static inline void bond_slave_state_change(struct bonding *bond)
	374	{
	375	struct list_head *iter;
	376	struct slave *tmp;
	377
	378	bond_for_each_slave(bond, tmp, iter) {
	379	if (tmp->link == BOND_LINK_UP)
	380	bond_set_active_slave(tmp);
	381	else if (tmp->link == BOND_LINK_DOWN)
	382	bond_set_backup_slave(tmp);
	383	}
	384	}
	385
	386	static inline void bond_slave_state_notify(struct bonding *bond)
	387	{
	388	struct list_head *iter;
	389	struct slave *tmp;
	390
	391	bond_for_each_slave(bond, tmp, iter) {
	392	if (tmp->should_notify) {
	393	bond_lower_state_changed(tmp);
	394	rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
	395	tmp->should_notify = 0;
	396	}
	397	}
	398	}
	399
	400	static inline int bond_slave_state(struct slave *slave)
	401	{
	402	return slave->backup;
	403	}
	404
	405	static inline bool bond_is_active_slave(struct slave *slave)
	406	{
	407	return !bond_slave_state(slave);
	408	}
	409
	410	static inline bool bond_slave_can_tx(struct slave *slave)
	411	{
	412	return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
	413	bond_is_active_slave(slave);
	414	}
	415
	416	#define BOND_PRI_RESELECT_ALWAYS 0
	417	#define BOND_PRI_RESELECT_BETTER 1
	418	#define BOND_PRI_RESELECT_FAILURE 2
	419
	420	#define BOND_FOM_NONE 0
	421	#define BOND_FOM_ACTIVE 1
	422	#define BOND_FOM_FOLLOW 2
	423
	424	#define BOND_ARP_TARGETS_ANY 0
	425	#define BOND_ARP_TARGETS_ALL 1
	426
	427	#define BOND_ARP_VALIDATE_NONE 0
	428	#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
	429	#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
	430	#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE \| \
	431	BOND_ARP_VALIDATE_BACKUP)
	432	#define BOND_ARP_FILTER (BOND_ARP_VALIDATE_ALL + 1)
	433	#define BOND_ARP_FILTER_ACTIVE (BOND_ARP_VALIDATE_ACTIVE \| \
	434	BOND_ARP_FILTER)
	435	#define BOND_ARP_FILTER_BACKUP (BOND_ARP_VALIDATE_BACKUP \| \
	436	BOND_ARP_FILTER)
	437
	438	#define BOND_SLAVE_NOTIFY_NOW true
	439	#define BOND_SLAVE_NOTIFY_LATER false
	440
	441	static inline int slave_do_arp_validate(struct bonding *bond,
	442	struct slave *slave)
	443	{
	444	return bond->params.arp_validate & (1 << bond_slave_state(slave));
	445	}
	446
	447	static inline int slave_do_arp_validate_only(struct bonding *bond)
	448	{
	449	return bond->params.arp_validate & BOND_ARP_FILTER;
	450	}
	451
	452	static inline int bond_is_ip_target_ok(__be32 addr)
	453	{
	454	return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
	455	}
	456
	457	/* Get the oldest arp which we've received on this slave for bond's
	458	* arp_targets.
	459	*/
	460	static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
	461	struct slave *slave)
	462	{
	463	int i = 1;
	464	unsigned long ret = slave->target_last_arp_rx[0];
	465
	466	for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
	467	if (time_before(slave->target_last_arp_rx[i], ret))
	468	ret = slave->target_last_arp_rx[i];
	469
	470	return ret;
	471	}
	472
	473	static inline unsigned long slave_last_rx(struct bonding *bond,
	474	struct slave *slave)
	475	{
	476	if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
	477	return slave_oldest_target_arp_rx(bond, slave);
	478
	479	return slave->last_rx;
	480	}
	481
	482	#ifdef CONFIG_NET_POLL_CONTROLLER
	483	static inline void bond_netpoll_send_skb(const struct slave *slave,
	484	struct sk_buff *skb)
	485	{
	486	struct netpoll *np = slave->np;
	487
	488	if (np)
	489	netpoll_send_skb(np, skb);
	490	}
	491	#else
	492	static inline void bond_netpoll_send_skb(const struct slave *slave,
	493	struct sk_buff *skb)
	494	{
	495	}
	496	#endif
	497
	498	static inline void bond_set_slave_inactive_flags(struct slave *slave,
	499	bool notify)
	500	{
	501	if (!bond_is_lb(slave->bond))
	502	bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
	503	if (!slave->bond->params.all_slaves_active)
	504	slave->inactive = 1;
	505	}
	506
	507	static inline void bond_set_slave_active_flags(struct slave *slave,
	508	bool notify)
	509	{
	510	bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
	511	slave->inactive = 0;
	512	}
	513
	514	static inline bool bond_is_slave_inactive(struct slave *slave)
	515	{
	516	return slave->inactive;
	517	}
	518
	519	static inline void bond_set_slave_link_state(struct slave *slave, int state,
	520	bool notify)
	521	{
	522	if (slave->link == state)
	523	return;
	524
	525	slave->link = state;
	526	if (notify) {
	527	bond_queue_slave_event(slave);
	528	bond_lower_state_changed(slave);
	529	slave->should_notify_link = 0;
	530	} else {
	531	if (slave->should_notify_link)
	532	slave->should_notify_link = 0;
	533	else
	534	slave->should_notify_link = 1;
	535	}
	536	}
	537
	538	static inline void bond_slave_link_notify(struct bonding *bond)
	539	{
	540	struct list_head *iter;
	541	struct slave *tmp;
	542
	543	bond_for_each_slave(bond, tmp, iter) {
	544	if (tmp->should_notify_link) {
	545	bond_queue_slave_event(tmp);
	546	bond_lower_state_changed(tmp);
	547	tmp->should_notify_link = 0;
	548	}
	549	}
	550	}
	551
	552	static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
	553	{
	554	struct in_device *in_dev;
	555	__be32 addr = 0;
	556
	557	rcu_read_lock();
	558	in_dev = __in_dev_get_rcu(dev);
	559
	560	if (in_dev)
	561	addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
	562	RT_SCOPE_HOST);
	563	rcu_read_unlock();
	564	return addr;
	565	}
	566
	567	struct bond_net {
	568	struct net net; / Associated network namespace */
	569	struct list_head dev_list;
	570	#ifdef CONFIG_PROC_FS
	571	struct proc_dir_entry *proc_dir;
	572	#endif
	573	struct class_attribute class_attr_bonding_masters;
	574	};
	575
	576	int bond_arp_rcv(const struct sk_buff skb, struct bonding bond, struct slave *slave);
	577	void bond_dev_queue_xmit(struct bonding bond, struct sk_buff skb, struct net_device *slave_dev);
	578	int bond_create(struct net net, const char name);
	579	int bond_create_sysfs(struct bond_net *net);
	580	void bond_destroy_sysfs(struct bond_net *net);
	581	void bond_prepare_sysfs_group(struct bonding *bond);
	582	int bond_sysfs_slave_add(struct slave *slave);
	583	void bond_sysfs_slave_del(struct slave *slave);
	584	int bond_enslave(struct net_device bond_dev, struct net_device slave_dev);
	585	int bond_release(struct net_device bond_dev, struct net_device slave_dev);
	586	u32 bond_xmit_hash(struct bonding bond, struct sk_buff skb);
	587	int bond_set_carrier(struct bonding *bond);
	588	void bond_select_active_slave(struct bonding *bond);
	589	void bond_change_active_slave(struct bonding bond, struct slave new_active);
	590	void bond_create_debugfs(void);
	591	void bond_destroy_debugfs(void);
	592	void bond_debug_register(struct bonding *bond);
	593	void bond_debug_unregister(struct bonding *bond);
	594	void bond_debug_reregister(struct bonding *bond);
	595	const char *bond_mode_name(int mode);
	596	void bond_setup(struct net_device *bond_dev);
	597	unsigned int bond_get_num_tx_queues(void);
	598	int bond_netlink_init(void);
	599	void bond_netlink_fini(void);
	600	struct net_device bond_option_active_slave_get_rcu(struct bonding bond);
	601	const char *bond_slave_link_status(s8 link);
	602	struct bond_vlan_tag bond_verify_device_path(struct net_device start_dev,
	603	struct net_device *end_dev,
	604	int level);
	605	int bond_update_slave_arr(struct bonding bond, struct slave skipslave);
	606	void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
	607
	608	#ifdef CONFIG_PROC_FS
	609	void bond_create_proc_entry(struct bonding *bond);
	610	void bond_remove_proc_entry(struct bonding *bond);
	611	void bond_create_proc_dir(struct bond_net *bn);
	612	void bond_destroy_proc_dir(struct bond_net *bn);
	613	#else
	614	static inline void bond_create_proc_entry(struct bonding *bond)
	615	{
	616	}
	617
	618	static inline void bond_remove_proc_entry(struct bonding *bond)
	619	{
	620	}
	621
	622	static inline void bond_create_proc_dir(struct bond_net *bn)
	623	{
	624	}
	625
	626	static inline void bond_destroy_proc_dir(struct bond_net *bn)
	627	{
	628	}
	629	#endif
	630
	631	static inline struct slave bond_slave_has_mac(struct bonding bond,
	632	const u8 *mac)
	633	{
	634	struct list_head *iter;
	635	struct slave *tmp;
	636
	637	bond_for_each_slave(bond, tmp, iter)
	638	if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
	639	return tmp;
	640
	641	return NULL;
	642	}
	643
	644	/* Caller must hold rcu_read_lock() for read */
	645	static inline struct slave bond_slave_has_mac_rcu(struct bonding bond,
	646	const u8 *mac)
	647	{
	648	struct list_head *iter;
	649	struct slave *tmp;
	650
	651	bond_for_each_slave_rcu(bond, tmp, iter)
	652	if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
	653	return tmp;
	654
	655	return NULL;
	656	}
	657
	658	/* Caller must hold rcu_read_lock() for read */
	659	static inline bool bond_slave_has_mac_rx(struct bonding bond, const u8 mac)
	660	{
	661	struct list_head *iter;
	662	struct slave *tmp;
	663	struct netdev_hw_addr *ha;
	664
	665	bond_for_each_slave_rcu(bond, tmp, iter)
	666	if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
	667	return true;
	668
	669	if (netdev_uc_empty(bond->dev))
	670	return false;
	671
	672	netdev_for_each_uc_addr(ha, bond->dev)
	673	if (ether_addr_equal_64bits(mac, ha->addr))
	674	return true;
	675
	676	return false;
	677	}
	678
	679	/* Check if the ip is present in arp ip list, or first free slot if ip == 0
	680	* Returns -1 if not found, index if found
	681	*/
	682	static inline int bond_get_targets_ip(__be32 *targets, __be32 ip)
	683	{
	684	int i;
	685
	686	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
	687	if (targets[i] == ip)
	688	return i;
	689	else if (targets[i] == 0)
	690	break;
	691
	692	return -1;
	693	}
	694
	695	/* exported from bond_main.c */
	696	extern int bond_net_id;
	697	extern const struct bond_parm_tbl bond_lacp_tbl[];
	698	extern const struct bond_parm_tbl xmit_hashtype_tbl[];
	699	extern const struct bond_parm_tbl arp_validate_tbl[];
	700	extern const struct bond_parm_tbl arp_all_targets_tbl[];
	701	extern const struct bond_parm_tbl fail_over_mac_tbl[];
	702	extern const struct bond_parm_tbl pri_reselect_tbl[];
	703	extern struct bond_parm_tbl ad_select_tbl[];
	704
	705	/* exported from bond_netlink.c */
	706	extern struct rtnl_link_ops bond_link_ops;
	707
	708	static inline void bond_tx_drop(struct net_device dev, struct sk_buff skb)
	709	{
	710	atomic_long_inc(&dev->tx_dropped);
	711	dev_kfree_skb_any(skb);
	712	}
	713
	714	#endif /* _NET_BONDING_H */