059b47e8aa
This is necessary mainly for two bonding call sites: procfs and sysfs as it was dereferenced without any real protection. Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
632 lines
16 KiB
C
632 lines
16 KiB
C
/*
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* Bond several ethernet interfaces into a Cisco, running 'Etherchannel'.
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*
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* Portions are (c) Copyright 1995 Simon "Guru Aleph-Null" Janes
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* NCM: Network and Communications Management, Inc.
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*
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* BUT, I'm the one who modified it for ethernet, so:
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* (c) Copyright 1999, Thomas Davis, tadavis@lbl.gov
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*
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* This software may be used and distributed according to the terms
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* of the GNU Public License, incorporated herein by reference.
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*
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*/
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#ifndef _LINUX_BONDING_H
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#define _LINUX_BONDING_H
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#include <linux/timer.h>
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#include <linux/proc_fs.h>
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#include <linux/if_bonding.h>
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#include <linux/cpumask.h>
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#include <linux/in6.h>
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#include <linux/netpoll.h>
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#include <linux/inetdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/reciprocal_div.h>
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#include "bond_3ad.h"
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#include "bond_alb.h"
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#include "bond_options.h"
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#define DRV_VERSION "3.7.1"
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#define DRV_RELDATE "April 27, 2011"
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#define DRV_NAME "bonding"
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#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
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#define bond_version DRV_DESCRIPTION ": v" DRV_VERSION " (" DRV_RELDATE ")\n"
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#define BOND_MAX_ARP_TARGETS 16
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#define BOND_DEFAULT_MIIMON 100
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/*
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* Less bad way to call ioctl from within the kernel; this needs to be
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* done some other way to get the call out of interrupt context.
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* Needs "ioctl" variable to be supplied by calling context.
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*/
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#define IOCTL(dev, arg, cmd) ({ \
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int res = 0; \
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mm_segment_t fs = get_fs(); \
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set_fs(get_ds()); \
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res = ioctl(dev, arg, cmd); \
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set_fs(fs); \
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res; })
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#define BOND_MODE(bond) ((bond)->params.mode)
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/* slave list primitives */
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#define bond_slave_list(bond) (&(bond)->dev->adj_list.lower)
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#define bond_has_slaves(bond) !list_empty(bond_slave_list(bond))
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/* IMPORTANT: bond_first/last_slave can return NULL in case of an empty list */
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#define bond_first_slave(bond) \
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(bond_has_slaves(bond) ? \
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netdev_adjacent_get_private(bond_slave_list(bond)->next) : \
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NULL)
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#define bond_last_slave(bond) \
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(bond_has_slaves(bond) ? \
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netdev_adjacent_get_private(bond_slave_list(bond)->prev) : \
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NULL)
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/* Caller must have rcu_read_lock */
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#define bond_first_slave_rcu(bond) \
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netdev_lower_get_first_private_rcu(bond->dev)
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#define bond_is_first_slave(bond, pos) (pos == bond_first_slave(bond))
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#define bond_is_last_slave(bond, pos) (pos == bond_last_slave(bond))
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/**
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* bond_for_each_slave - iterate over all slaves
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* @bond: the bond holding this list
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* @pos: current slave
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* @iter: list_head * iterator
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*
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* Caller must hold bond->lock
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*/
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#define bond_for_each_slave(bond, pos, iter) \
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netdev_for_each_lower_private((bond)->dev, pos, iter)
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/* Caller must have rcu_read_lock */
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#define bond_for_each_slave_rcu(bond, pos, iter) \
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netdev_for_each_lower_private_rcu((bond)->dev, pos, iter)
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#ifdef CONFIG_NET_POLL_CONTROLLER
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extern atomic_t netpoll_block_tx;
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static inline void block_netpoll_tx(void)
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{
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atomic_inc(&netpoll_block_tx);
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}
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static inline void unblock_netpoll_tx(void)
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{
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atomic_dec(&netpoll_block_tx);
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}
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static inline int is_netpoll_tx_blocked(struct net_device *dev)
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{
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if (unlikely(netpoll_tx_running(dev)))
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return atomic_read(&netpoll_block_tx);
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return 0;
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}
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#else
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#define block_netpoll_tx()
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#define unblock_netpoll_tx()
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#define is_netpoll_tx_blocked(dev) (0)
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#endif
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struct bond_params {
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int mode;
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int xmit_policy;
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int miimon;
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u8 num_peer_notif;
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int arp_interval;
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int arp_validate;
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int arp_all_targets;
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int use_carrier;
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int fail_over_mac;
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int updelay;
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int downdelay;
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int lacp_fast;
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unsigned int min_links;
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int ad_select;
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char primary[IFNAMSIZ];
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int primary_reselect;
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__be32 arp_targets[BOND_MAX_ARP_TARGETS];
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int tx_queues;
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int all_slaves_active;
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int resend_igmp;
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int lp_interval;
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int packets_per_slave;
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int tlb_dynamic_lb;
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struct reciprocal_value reciprocal_packets_per_slave;
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};
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struct bond_parm_tbl {
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char *modename;
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int mode;
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};
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struct slave {
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struct net_device *dev; /* first - useful for panic debug */
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struct bonding *bond; /* our master */
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int delay;
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/* all three in jiffies */
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unsigned long last_link_up;
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unsigned long last_rx;
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unsigned long target_last_arp_rx[BOND_MAX_ARP_TARGETS];
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s8 link; /* one of BOND_LINK_XXXX */
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s8 new_link;
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u8 backup:1, /* indicates backup slave. Value corresponds with
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BOND_STATE_ACTIVE and BOND_STATE_BACKUP */
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inactive:1, /* indicates inactive slave */
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should_notify:1; /* indicateds whether the state changed */
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u8 duplex;
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u32 original_mtu;
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u32 link_failure_count;
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u32 speed;
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u16 queue_id;
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u8 perm_hwaddr[ETH_ALEN];
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struct ad_slave_info *ad_info;
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struct tlb_slave_info tlb_info;
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#ifdef CONFIG_NET_POLL_CONTROLLER
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struct netpoll *np;
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#endif
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struct kobject kobj;
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};
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/*
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* Link pseudo-state only used internally by monitors
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*/
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#define BOND_LINK_NOCHANGE -1
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/*
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* Here are the locking policies for the two bonding locks:
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*
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* 1) Get bond->lock when reading/writing slave list.
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* 2) Get bond->curr_slave_lock when reading/writing bond->curr_active_slave.
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* (It is unnecessary when the write-lock is put with bond->lock.)
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* 3) When we lock with bond->curr_slave_lock, we must lock with bond->lock
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* beforehand.
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*/
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struct bonding {
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struct net_device *dev; /* first - useful for panic debug */
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struct slave __rcu *curr_active_slave;
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struct slave __rcu *current_arp_slave;
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struct slave __rcu *primary_slave;
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bool force_primary;
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s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
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int (*recv_probe)(const struct sk_buff *, struct bonding *,
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struct slave *);
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rwlock_t lock;
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rwlock_t curr_slave_lock;
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u8 send_peer_notif;
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u8 igmp_retrans;
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc_entry;
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char proc_file_name[IFNAMSIZ];
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#endif /* CONFIG_PROC_FS */
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struct list_head bond_list;
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u32 rr_tx_counter;
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struct ad_bond_info ad_info;
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struct alb_bond_info alb_info;
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struct bond_params params;
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struct workqueue_struct *wq;
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struct delayed_work mii_work;
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struct delayed_work arp_work;
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struct delayed_work alb_work;
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struct delayed_work ad_work;
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struct delayed_work mcast_work;
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#ifdef CONFIG_DEBUG_FS
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/* debugging support via debugfs */
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struct dentry *debug_dir;
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#endif /* CONFIG_DEBUG_FS */
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};
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#define bond_slave_get_rcu(dev) \
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((struct slave *) rcu_dereference(dev->rx_handler_data))
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#define bond_slave_get_rtnl(dev) \
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((struct slave *) rtnl_dereference(dev->rx_handler_data))
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#define bond_deref_active_protected(bond) \
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rcu_dereference_protected(bond->curr_active_slave, \
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lockdep_is_held(&bond->curr_slave_lock))
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struct bond_vlan_tag {
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__be16 vlan_proto;
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unsigned short vlan_id;
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};
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/**
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* Returns NULL if the net_device does not belong to any of the bond's slaves
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*
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* Caller must hold bond lock for read
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*/
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static inline struct slave *bond_get_slave_by_dev(struct bonding *bond,
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struct net_device *slave_dev)
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{
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return netdev_lower_dev_get_private(bond->dev, slave_dev);
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}
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static inline struct bonding *bond_get_bond_by_slave(struct slave *slave)
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{
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return slave->bond;
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}
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static inline bool bond_should_override_tx_queue(struct bonding *bond)
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{
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return BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
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BOND_MODE(bond) == BOND_MODE_ROUNDROBIN;
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}
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static inline bool bond_is_lb(const struct bonding *bond)
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{
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return BOND_MODE(bond) == BOND_MODE_TLB ||
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BOND_MODE(bond) == BOND_MODE_ALB;
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}
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static inline bool bond_is_nondyn_tlb(const struct bonding *bond)
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{
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return (BOND_MODE(bond) == BOND_MODE_TLB) &&
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(bond->params.tlb_dynamic_lb == 0);
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}
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static inline bool bond_mode_uses_arp(int mode)
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{
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return mode != BOND_MODE_8023AD && mode != BOND_MODE_TLB &&
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mode != BOND_MODE_ALB;
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}
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static inline bool bond_mode_uses_primary(int mode)
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{
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return mode == BOND_MODE_ACTIVEBACKUP || mode == BOND_MODE_TLB ||
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mode == BOND_MODE_ALB;
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}
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static inline bool bond_uses_primary(struct bonding *bond)
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{
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return bond_mode_uses_primary(BOND_MODE(bond));
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}
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static inline bool bond_slave_is_up(struct slave *slave)
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{
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return netif_running(slave->dev) && netif_carrier_ok(slave->dev);
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}
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static inline void bond_set_active_slave(struct slave *slave)
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{
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if (slave->backup) {
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slave->backup = 0;
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rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
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}
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}
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static inline void bond_set_backup_slave(struct slave *slave)
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{
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if (!slave->backup) {
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slave->backup = 1;
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rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
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}
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}
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static inline void bond_set_slave_state(struct slave *slave,
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int slave_state, bool notify)
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{
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if (slave->backup == slave_state)
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return;
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slave->backup = slave_state;
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if (notify) {
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rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC);
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slave->should_notify = 0;
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} else {
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if (slave->should_notify)
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slave->should_notify = 0;
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else
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slave->should_notify = 1;
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}
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}
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static inline void bond_slave_state_change(struct bonding *bond)
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{
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struct list_head *iter;
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struct slave *tmp;
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bond_for_each_slave(bond, tmp, iter) {
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if (tmp->link == BOND_LINK_UP)
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bond_set_active_slave(tmp);
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else if (tmp->link == BOND_LINK_DOWN)
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bond_set_backup_slave(tmp);
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}
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}
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static inline void bond_slave_state_notify(struct bonding *bond)
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{
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struct list_head *iter;
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struct slave *tmp;
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bond_for_each_slave(bond, tmp, iter) {
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if (tmp->should_notify) {
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rtmsg_ifinfo(RTM_NEWLINK, tmp->dev, 0, GFP_ATOMIC);
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tmp->should_notify = 0;
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}
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}
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}
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static inline int bond_slave_state(struct slave *slave)
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{
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return slave->backup;
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}
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static inline bool bond_is_active_slave(struct slave *slave)
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{
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return !bond_slave_state(slave);
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}
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static inline bool bond_slave_can_tx(struct slave *slave)
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{
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return bond_slave_is_up(slave) && slave->link == BOND_LINK_UP &&
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bond_is_active_slave(slave);
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}
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#define BOND_PRI_RESELECT_ALWAYS 0
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#define BOND_PRI_RESELECT_BETTER 1
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#define BOND_PRI_RESELECT_FAILURE 2
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#define BOND_FOM_NONE 0
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#define BOND_FOM_ACTIVE 1
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#define BOND_FOM_FOLLOW 2
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#define BOND_ARP_TARGETS_ANY 0
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#define BOND_ARP_TARGETS_ALL 1
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#define BOND_ARP_VALIDATE_NONE 0
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#define BOND_ARP_VALIDATE_ACTIVE (1 << BOND_STATE_ACTIVE)
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#define BOND_ARP_VALIDATE_BACKUP (1 << BOND_STATE_BACKUP)
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#define BOND_ARP_VALIDATE_ALL (BOND_ARP_VALIDATE_ACTIVE | \
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BOND_ARP_VALIDATE_BACKUP)
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#define BOND_ARP_FILTER (BOND_ARP_VALIDATE_ALL + 1)
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#define BOND_ARP_FILTER_ACTIVE (BOND_ARP_VALIDATE_ACTIVE | \
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BOND_ARP_FILTER)
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#define BOND_ARP_FILTER_BACKUP (BOND_ARP_VALIDATE_BACKUP | \
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BOND_ARP_FILTER)
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#define BOND_SLAVE_NOTIFY_NOW true
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#define BOND_SLAVE_NOTIFY_LATER false
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static inline int slave_do_arp_validate(struct bonding *bond,
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struct slave *slave)
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{
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return bond->params.arp_validate & (1 << bond_slave_state(slave));
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}
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static inline int slave_do_arp_validate_only(struct bonding *bond)
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{
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return bond->params.arp_validate & BOND_ARP_FILTER;
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}
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static inline int bond_is_ip_target_ok(__be32 addr)
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{
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return !ipv4_is_lbcast(addr) && !ipv4_is_zeronet(addr);
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}
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/* Get the oldest arp which we've received on this slave for bond's
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* arp_targets.
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*/
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static inline unsigned long slave_oldest_target_arp_rx(struct bonding *bond,
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struct slave *slave)
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{
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int i = 1;
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unsigned long ret = slave->target_last_arp_rx[0];
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for (; (i < BOND_MAX_ARP_TARGETS) && bond->params.arp_targets[i]; i++)
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if (time_before(slave->target_last_arp_rx[i], ret))
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ret = slave->target_last_arp_rx[i];
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return ret;
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}
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static inline unsigned long slave_last_rx(struct bonding *bond,
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struct slave *slave)
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{
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if (bond->params.arp_all_targets == BOND_ARP_TARGETS_ALL)
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return slave_oldest_target_arp_rx(bond, slave);
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return slave->last_rx;
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static inline void bond_netpoll_send_skb(const struct slave *slave,
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struct sk_buff *skb)
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{
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struct netpoll *np = slave->np;
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if (np)
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netpoll_send_skb(np, skb);
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}
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#else
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static inline void bond_netpoll_send_skb(const struct slave *slave,
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struct sk_buff *skb)
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{
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}
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#endif
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static inline void bond_set_slave_inactive_flags(struct slave *slave,
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bool notify)
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{
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if (!bond_is_lb(slave->bond))
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bond_set_slave_state(slave, BOND_STATE_BACKUP, notify);
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if (!slave->bond->params.all_slaves_active)
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slave->inactive = 1;
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}
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static inline void bond_set_slave_active_flags(struct slave *slave,
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bool notify)
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{
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bond_set_slave_state(slave, BOND_STATE_ACTIVE, notify);
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slave->inactive = 0;
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}
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static inline bool bond_is_slave_inactive(struct slave *slave)
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{
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return slave->inactive;
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}
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static inline __be32 bond_confirm_addr(struct net_device *dev, __be32 dst, __be32 local)
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{
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struct in_device *in_dev;
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__be32 addr = 0;
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rcu_read_lock();
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in_dev = __in_dev_get_rcu(dev);
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if (in_dev)
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addr = inet_confirm_addr(dev_net(dev), in_dev, dst, local,
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RT_SCOPE_HOST);
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rcu_read_unlock();
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return addr;
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}
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struct bond_net {
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struct net *net; /* Associated network namespace */
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struct list_head dev_list;
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc_dir;
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#endif
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struct class_attribute class_attr_bonding_masters;
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};
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int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
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void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb, struct net_device *slave_dev);
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int bond_create(struct net *net, const char *name);
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int bond_create_sysfs(struct bond_net *net);
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void bond_destroy_sysfs(struct bond_net *net);
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void bond_prepare_sysfs_group(struct bonding *bond);
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int bond_sysfs_slave_add(struct slave *slave);
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void bond_sysfs_slave_del(struct slave *slave);
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int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);
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int bond_release(struct net_device *bond_dev, struct net_device *slave_dev);
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u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb);
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void bond_select_active_slave(struct bonding *bond);
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void bond_change_active_slave(struct bonding *bond, struct slave *new_active);
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void bond_create_debugfs(void);
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void bond_destroy_debugfs(void);
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void bond_debug_register(struct bonding *bond);
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void bond_debug_unregister(struct bonding *bond);
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void bond_debug_reregister(struct bonding *bond);
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const char *bond_mode_name(int mode);
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void bond_setup(struct net_device *bond_dev);
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unsigned int bond_get_num_tx_queues(void);
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int bond_netlink_init(void);
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void bond_netlink_fini(void);
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struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond);
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const char *bond_slave_link_status(s8 link);
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struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
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struct net_device *end_dev,
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int level);
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|
|
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#ifdef CONFIG_PROC_FS
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void bond_create_proc_entry(struct bonding *bond);
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void bond_remove_proc_entry(struct bonding *bond);
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void bond_create_proc_dir(struct bond_net *bn);
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void bond_destroy_proc_dir(struct bond_net *bn);
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#else
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static inline void bond_create_proc_entry(struct bonding *bond)
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{
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}
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|
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static inline void bond_remove_proc_entry(struct bonding *bond)
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{
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}
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|
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static inline void bond_create_proc_dir(struct bond_net *bn)
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|
{
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|
}
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|
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static inline void bond_destroy_proc_dir(struct bond_net *bn)
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|
{
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}
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#endif
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|
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static inline struct slave *bond_slave_has_mac(struct bonding *bond,
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const u8 *mac)
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|
{
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struct list_head *iter;
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|
struct slave *tmp;
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|
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bond_for_each_slave(bond, tmp, iter)
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if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
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return tmp;
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|
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|
return NULL;
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}
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|
|
|
/* Caller must hold rcu_read_lock() for read */
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|
static inline struct slave *bond_slave_has_mac_rcu(struct bonding *bond,
|
|
const u8 *mac)
|
|
{
|
|
struct list_head *iter;
|
|
struct slave *tmp;
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|
|
|
bond_for_each_slave_rcu(bond, tmp, iter)
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|
if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
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|
return tmp;
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|
|
|
return NULL;
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|
}
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|
|
|
/* Caller must hold rcu_read_lock() for read */
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|
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)
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|
if (ether_addr_equal_64bits(mac, tmp->dev->dev_addr))
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|
return true;
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|
|
|
if (netdev_uc_empty(bond->dev))
|
|
return false;
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|
|
|
netdev_for_each_uc_addr(ha, bond->dev)
|
|
if (ether_addr_equal_64bits(mac, ha->addr))
|
|
return true;
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|
|
|
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[];
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|
|
|
/* exported from bond_netlink.c */
|
|
extern struct rtnl_link_ops bond_link_ops;
|
|
|
|
#endif /* _LINUX_BONDING_H */
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