Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-10-31 09:11:49 +00:00
Code Issues Packages Projects Releases Wiki Activity
ca05f29cf5
linux/drivers/net/bonding/bonding.h
Andy Gospodarek eaddcd7690 bonding: remove entries for master_ip and vlan_ip and query devices instead 
The following patch aimed to resolve an issue where secondary, tertiary,
etc. addresses added to bond interfaces could overwrite the
bond->master_ip and vlan_ip values.

        commit 917fbdb32f
        Author: Henrik Saavedra Persson <henrik.e.persson@ericsson.com>
        Date:   Wed Nov 23 23:37:15 2011 +0000

            bonding: only use primary address for ARP

That patch was good because it prevented bonds using ARP monitoring from
sending frames with an invalid source IP address.  Unfortunately, it
didn't always work as expected.

When using an ioctl (like ifconfig does) to set the IP address and
netmask, 2 separate ioctls are actually called to set the IP and netmask
if the mask chosen doesn't match the standard mask for that class of
address.  The first ioctl did not have a mask that matched the one in
the primary address and would still cause the device address to be
overwritten.  The second ioctl that was called to set the mask would
then detect as secondary and ignored, but the damage was already done.

This was not an issue when using an application that used netlink
sockets as the setting of IP and netmask came down at once.  The
inconsistent behavior between those two interfaces was something that
needed to be resolved.

While I was thinking about how I wanted to resolve this, Ralf Zeidler
came with a patch that resolved this on a RHEL kernel by keeping a full
shadow of the entries in dev->ifa_list for the bonding device and vlan
devices in the bonding driver.  I didn't like the duplication of the
list as I want to see the 'bonding' struct and code shrink rather than
grow, but liked the general idea.

As the Subject indicates this patch drops the master_ip and vlan_ip
elements from the 'bonding' and 'vlan_entry' structs, respectively.
This can be done because a device's address-list is now traversed to
determine the optimal source IP address for ARP requests and for checks
to see if the bonding device has a particular IP address.  This code
could have all be contained inside the bonding driver, but it made more
sense to me to EXPORT and call inet_confirm_addr since it did exactly
what was needed.

I tested this and a backported patch and everything works as expected.
Ralf also helped with verification of the backported patch.

Thanks to Ralf for all his help on this.

v2: Whitespace and organizational changes based on suggestions from Jay
Vosburgh and Dave Miller.

v3: Fixup incorrect usage of rcu_read_unlock based on Dave Miller's
suggestion.

Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
CC: Ralf Zeidler <ralf.zeidler@nsn.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-22 22:36:17 -04:00

465 lines
12 KiB
C
Raw Blame History

/*
* 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 _LINUX_BONDING_H
#define _LINUX_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 "bond_3ad.h"
#include "bond_alb.h"
#define DRV_VERSION "3.7.1"
#define DRV_RELDATE "April 27, 2011"
#define DRV_NAME "bonding"
#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
#define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
#define BOND_MAX_ARP_TARGETS 16
#define IS_UP(dev) \
((((dev)->flags & IFF_UP) == IFF_UP) && \
netif_running(dev) && \
netif_carrier_ok(dev))
/*
* Checks whether slave is ready for transmit.
*/
#define SLAVE_IS_OK(slave) \
(((slave)->dev->flags & IFF_UP) && \
netif_running((slave)->dev) && \
((slave)->link == BOND_LINK_UP) && \
bond_is_active_slave(slave))
#define USES_PRIMARY(mode) \
(((mode) == BOND_MODE_ACTIVEBACKUP) || \
((mode) == BOND_MODE_TLB) || \
((mode) == BOND_MODE_ALB))
#define TX_QUEUE_OVERRIDE(mode) \
(((mode) == BOND_MODE_ACTIVEBACKUP) || \
((mode) == BOND_MODE_ROUNDROBIN))
/*
* 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; })
/**
* bond_for_each_slave_from - iterate the slaves list from a starting point
* @bond: the bond holding this list.
* @pos: current slave.
* @cnt: counter for max number of moves
* @start: starting point.
*
* Caller must hold bond->lock
*/
#define bond_for_each_slave_from(bond, pos, cnt, start) \
for (cnt = 0, pos = start; \
cnt < (bond)->slave_cnt; \
cnt++, pos = (pos)->next)
/**
* bond_for_each_slave_from_to - iterate the slaves list from start point to stop point
* @bond: the bond holding this list.
* @pos: current slave.
* @cnt: counter for number max of moves
* @start: start point.
* @stop: stop point.
*
* Caller must hold bond->lock
*/
#define bond_for_each_slave_from_to(bond, pos, cnt, start, stop) \
for (cnt = 0, pos = start; \
((cnt < (bond)->slave_cnt) && (pos != (stop)->next)); \
cnt++, pos = (pos)->next)
/**
* bond_for_each_slave - iterate the slaves list from head
* @bond: the bond holding this list.
* @pos: current slave.
* @cnt: counter for max number of moves
*
* Caller must hold bond->lock
*/
#define bond_for_each_slave(bond, pos, cnt) \
bond_for_each_slave_from(bond, pos, cnt, (bond)->first_slave)
#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 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;
};
struct bond_parm_tbl {
char *modename;
int mode;
};
#define BOND_MAX_MODENAME_LEN 20
struct vlan_entry {
struct list_head vlan_list;
unsigned short vlan_id;
};
struct slave {
struct net_device *dev; /* first - useful for panic debug */
struct slave *next;
struct slave *prev;
struct bonding *bond; /* our master */
int delay;
unsigned long jiffies;
unsigned long last_arp_rx;
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 */
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; /* HUGE - better to dynamically alloc */
struct tlb_slave_info tlb_info;
#ifdef CONFIG_NET_POLL_CONTROLLER
struct netpoll *np;
#endif
};
/*
* Link pseudo-state only used internally by monitors
*/
#define BOND_LINK_NOCHANGE -1
/*
* Here are the locking policies for the two bonding locks:
*
* 1) Get bond->lock when reading/writing slave list.
* 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
* (It is unnecessary when the write-lock is put with bond->lock.)
* 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
* beforehand.
*/
struct bonding {
struct net_device *dev; /* first - useful for panic debug */
struct slave *first_slave;
struct slave *curr_active_slave;
struct slave *current_arp_slave;
struct slave *primary_slave;
bool force_primary;
s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
void (*recv_probe)(struct sk_buff *, struct bonding *,
struct slave *);
rwlock_t lock;
rwlock_t curr_slave_lock;
u8 send_peer_notif;
s8 setup_by_slave;
s8 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;
struct netdev_hw_addr_list mc_list;
int (*xmit_hash_policy)(struct sk_buff *, int);
u16 rr_tx_counter;
struct ad_bond_info ad_info;
struct alb_bond_info alb_info;
struct bond_params params;
struct list_head vlan_list;
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;
#ifdef CONFIG_DEBUG_FS
/* debugging suport via debugfs */
struct dentry *debug_dir;
#endif /* CONFIG_DEBUG_FS */
};
static inline bool bond_vlan_used(struct bonding *bond)
{
return !list_empty(&bond->vlan_list);
}
#define bond_slave_get_rcu(dev) \
((struct slave *) rcu_dereference(dev->rx_handler_data))
/**
* 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)
{
struct slave *slave = NULL;
int i;
bond_for_each_slave(bond, slave, i) {
if (slave->dev == slave_dev) {
return slave;
}
}
return NULL;
}
static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
{
if (!slave || !slave->dev->master) {
return NULL;
}
return netdev_priv(slave->dev->master);
}
static inline bool bond_is_lb(const struct bonding *bond)
{
return (bond->params.mode == BOND_MODE_TLB ||
bond->params.mode == BOND_MODE_ALB);
}
static inline void bond_set_active_slave(struct slave *slave)
{
slave->backup = 0;
}
static inline void bond_set_backup_slave(struct slave *slave)
{
slave->backup = 1;
}
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);
}
#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_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)
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 unsigned long slave_last_rx(struct bonding *bond,
struct slave *slave)
{
if (slave_do_arp_validate(bond, slave))
return slave->last_arp_rx;
return slave->dev->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)
{
struct bonding *bond = netdev_priv(slave->dev->master);
if (!bond_is_lb(bond))
bond_set_backup_slave(slave);
if (!bond->params.all_slaves_active)
slave->inactive = 1;
}
static inline void bond_set_slave_active_flags(struct slave *slave)
{
bond_set_active_slave(slave);
slave->inactive = 0;
}
static inline bool bond_is_slave_inactive(struct slave *slave)
{
return slave->inactive;
}
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 vlan_entry *bond_next_vlan(struct bonding *bond, struct vlan_entry *curr);
int 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_create_slave_symlinks(struct net_device *master, struct net_device *slave);
void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *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);
void bond_mii_monitor(struct work_struct *);
void bond_loadbalance_arp_mon(struct work_struct *);
void bond_activebackup_arp_mon(struct work_struct *);
void bond_set_mode_ops(struct bonding *bond, int mode);
int bond_parse_parm(const char *mode_arg, const struct bond_parm_tbl *tbl);
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);
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;
};
#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
/* 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 bond_mode_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 fail_over_mac_tbl[];
extern const struct bond_parm_tbl pri_reselect_tbl[];
extern struct bond_parm_tbl ad_select_tbl[];
#endif /* _LINUX_BONDING_H */
Reference in New Issue View Git Blame Copy Permalink