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/*
* 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
#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))
/* Since bond_first/last_slave can return NULL, these can return NULL too */
#define bond_next_slave(bond, pos) __bond_next_slave(bond, pos)
/**
* 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 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 link_new_state; /* one of BOND_LINK_XXXX */
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[MAX_ADDR_LEN];
struct ad_slave_info *ad_info;
struct tlb_slave_info tlb_info;
#ifdef CONFIG_NET_POLL_CONTROLLER
struct netpoll *np;
#endif
struct delayed_work notify_work;
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;
};
struct netdev_upper {
struct net_device *dev;
bool master;
struct list_head list;
struct rcu_head rcu;
struct list_head search_list;
};
#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;
};
/**
* __bond_next_slave - get the next slave after the one provided
* @bond - bonding struct
* @slave - the slave provided
*
* Returns the next slave after the slave provided, first slave if the
* slave provided is the last slave and NULL if slave is not found
*/
static inline struct slave *__bond_next_slave(struct bonding *bond,
struct slave *slave)
{
struct slave *slave_iter;
struct list_head *iter;
bool found = false;
netdev_for_each_lower_private(bond->dev, slave_iter, iter) {
if (found)
return slave_iter;
if (slave_iter == slave)
found = true;
}
if (found)
return bond_first_slave(bond);
return NULL;
}
/**
* 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_needs_speed_duplex(const struct bonding *bond)
{
return BOND_MODE(bond) == BOND_MODE_8023AD || bond_is_lb(bond);
}
static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
{
return (bond_is_lb(bond) && bond->params.tlb_dynamic_lb == 0);
}
static inline bool bond_mode_can_use_xmit_hash(const struct bonding *bond)
{
return (BOND_MODE(bond) == BOND_MODE_8023AD ||
BOND_MODE(bond) == BOND_MODE_XOR ||
BOND_MODE(bond) == BOND_MODE_TLB ||
BOND_MODE(bond) == BOND_MODE_ALB);
}
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);
}
}
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);
}
}
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);
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);
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);
}
static inline void bond_hw_addr_copy(u8 *dst, const u8 *src, unsigned int len)
{
if (len == ETH_ALEN) {
ether_addr_copy(dst, src);
return;
}
memcpy(dst, src, len);
}
#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_propose_link_state(struct slave *slave, int state)
{
slave->link_new_state = state;
}
static inline void bond_commit_link_state(struct slave *slave, bool notify)
{
if (slave->link_new_state == BOND_LINK_NOCHANGE)
return;
slave->link = slave->link_new_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_set_slave_link_state(struct slave *slave, int state,
bool notify)
{
bond_propose_link_state(slave, state);
bond_commit_link_state(slave, notify);
}
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(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);
int bond_update_slave_arr(struct bonding *bond, struct slave *skipslave);
void bond_slave_arr_work_rearm(struct bonding *bond, unsigned long delay);
void bond_work_init_all(struct bonding *bond);
#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;
}
/* 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)
{
dev_kfree_skb_any(skb);
}
#endif /* _NET_BONDING_H */
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