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Merge branch 'bonding_arp'

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Nikolay Aleksandrov says:

====================
bonding: fix arp_validate desync state & race

These two patches aim to fix the possible de-sync state which the bond
can enter if we have arp_validate without arp_interval or the other way
around. They also fix a race condition between arp_validate setting and
mode changing.

Patch 01 - fixes the race condition between store_arp_validate and bond
mode change by using rtnl for sync
Patch 02 - fixes the possible de-sync state by setting/unsetting recv_probe
if arp_interval is set/unset and also if arp_validate is set/unset

v2: Fix the mode check in store_arp_validate
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2013-09-11 15:55:25 -04:00
parent 8112b1fe07 5bb9e0b50d
commit f3fcc9a406
3 changed files with 28 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/bonding/bond_main.c
View File

@@ -2404,8 +2404,8 @@ static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32
slave->target_last_arp_rx[i] = jiffies;
}
static int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
struct slave *slave)
{
struct arphdr *arp = (struct arphdr *)skb->data;
unsigned char *arp_ptr;

31
drivers/net/bonding/bond_sysfs.c
View File

@@ -349,6 +349,8 @@ static ssize_t bonding_store_mode(struct device *d,
goto out;
}
/* don't cache arp_validate between modes */
bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
bond->params.mode = new_value;
bond_set_mode_ops(bond, bond->params.mode);
pr_info("%s: setting mode to %s (%d).\n",
@@ -419,27 +421,39 @@ static ssize_t bonding_store_arp_validate(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value;
struct bonding *bond = to_bond(d);
int new_value, ret = count;
if (!rtnl_trylock())
return restart_syscall();
new_value = bond_parse_parm(buf, arp_validate_tbl);
if (new_value < 0) {
pr_err("%s: Ignoring invalid arp_validate value %s\n",
bond->dev->name, buf);
return -EINVAL;
ret = -EINVAL;
goto out;
}
if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
if (bond->params.mode != BOND_MODE_ACTIVEBACKUP) {
pr_err("%s: arp_validate only supported in active-backup mode.\n",
bond->dev->name);
return -EINVAL;
ret = -EINVAL;
goto out;
}
pr_info("%s: setting arp_validate to %s (%d).\n",
bond->dev->name, arp_validate_tbl[new_value].modename,
new_value);
if (bond->dev->flags & IFF_UP) {
if (!new_value)
bond->recv_probe = NULL;
else if (bond->params.arp_interval)
bond->recv_probe = bond_arp_rcv;
}
bond->params.arp_validate = new_value;
out:
rtnl_unlock();
return count;
return ret;
}
static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
@@ -555,8 +569,8 @@ static ssize_t bonding_store_arp_interval(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
int new_value, ret = count;
if (!rtnl_trylock())
return restart_syscall();
@@ -599,8 +613,13 @@ static ssize_t bonding_store_arp_interval(struct device *d,
* is called.
*/
if (!new_value) {
if (bond->params.arp_validate)
bond->recv_probe = NULL;
cancel_delayed_work_sync(&bond->arp_work);
} else {
/* arp_validate can be set only in active-backup mode */
if (bond->params.arp_validate)
bond->recv_probe = bond_arp_rcv;
cancel_delayed_work_sync(&bond->mii_work);
queue_delayed_work(bond->wq, &bond->arp_work, 0);
}

1
drivers/net/bonding/bonding.h
View File

@@ -430,6 +430,7 @@ static inline bool slave_can_tx(struct slave *slave)
struct bond_net;
int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond, struct slave *slave);
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);
void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id);