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linux/drivers/net/bonding/bond_sysfs.c
Jay Vosburgh 3201e656ce bonding: Fix use after free in unregister path 
The following patch (based on a patch from Stephen Hemminger
<shemminger@linux-foundation.org>) removes use after free conditions in
the unregister path for the bonding master.  Without this patch, an
operation of the form "echo -bond0 > /sys/class/net/bonding_masters"
would trigger a NULL pointer dereference in sysfs.  I was not able to
induce the failure with the non-sysfs code path, but for consistency I
updated that code as well.

	I also did some testing of the bonding /proc file being open
while the bond is being deleted, and didn't see any problems there.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-06-20 19:12:41 -04:00

1493 lines
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/*
* Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/sysfs.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/rtnetlink.h>
/* #define BONDING_DEBUG 1 */
#include "bonding.h"
#define to_dev(obj) container_of(obj,struct device,kobj)
#define to_bond(cd) ((struct bonding *)(to_net_dev(cd)->priv))
/*---------------------------- Declarations -------------------------------*/
extern struct list_head bond_dev_list;
extern struct bond_params bonding_defaults;
extern struct bond_parm_tbl bond_mode_tbl[];
extern struct bond_parm_tbl bond_lacp_tbl[];
extern struct bond_parm_tbl xmit_hashtype_tbl[];
extern struct bond_parm_tbl arp_validate_tbl[];
static int expected_refcount = -1;
static struct class *netdev_class;
/*--------------------------- Data Structures -----------------------------*/
/* Bonding sysfs lock. Why can't we just use the subsytem lock?
* Because kobject_register tries to acquire the subsystem lock. If
* we already hold the lock (which we would if the user was creating
* a new bond through the sysfs interface), we deadlock.
* This lock is only needed when deleting a bond - we need to make sure
* that we don't collide with an ongoing ioctl.
*/
struct rw_semaphore bonding_rwsem;
/*------------------------------ Functions --------------------------------*/
/*
* "show" function for the bond_masters attribute.
* The class parameter is ignored.
*/
static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
{
int res = 0;
struct bonding *bond;
down_read(&(bonding_rwsem));
list_for_each_entry(bond, &bond_dev_list, bond_list) {
if (res > (PAGE_SIZE - IFNAMSIZ)) {
/* not enough space for another interface name */
if ((PAGE_SIZE - res) > 10)
res = PAGE_SIZE - 10;
res += sprintf(buffer + res, "++more++");
break;
}
res += sprintf(buffer + res, "%s ",
bond->dev->name);
}
res += sprintf(buffer + res, "\n");
res++;
up_read(&(bonding_rwsem));
return res;
}
/*
* "store" function for the bond_masters attribute. This is what
* creates and deletes entire bonds.
*
* The class parameter is ignored.
*
*/
static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
{
char command[IFNAMSIZ + 1] = {0, };
char *ifname;
int res = count;
struct bonding *bond;
struct bonding *nxt;
down_write(&(bonding_rwsem));
sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
ifname = command + 1;
if ((strlen(command) <= 1) ||
!dev_valid_name(ifname))
goto err_no_cmd;
if (command[0] == '+') {
/* Check to see if the bond already exists. */
list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
printk(KERN_ERR DRV_NAME
": cannot add bond %s; it already exists\n",
ifname);
res = -EPERM;
goto out;
}
printk(KERN_INFO DRV_NAME
": %s is being created...\n", ifname);
if (bond_create(ifname, &bonding_defaults, &bond)) {
printk(KERN_INFO DRV_NAME
": %s interface already exists. Bond creation failed.\n",
ifname);
res = -EPERM;
}
goto out;
}
if (command[0] == '-') {
list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
rtnl_lock();
/* check the ref count on the bond's kobject.
* If it's > expected, then there's a file open,
* and we have to fail.
*/
if (atomic_read(&bond->dev->dev.kobj.kref.refcount)
> expected_refcount){
rtnl_unlock();
printk(KERN_INFO DRV_NAME
": Unable remove bond %s due to open references.\n",
ifname);
res = -EPERM;
goto out;
}
printk(KERN_INFO DRV_NAME
": %s is being deleted...\n",
bond->dev->name);
bond_deinit(bond->dev);
bond_destroy_sysfs_entry(bond);
unregister_netdevice(bond->dev);
rtnl_unlock();
goto out;
}
printk(KERN_ERR DRV_NAME
": unable to delete non-existent bond %s\n", ifname);
res = -ENODEV;
goto out;
}
err_no_cmd:
printk(KERN_ERR DRV_NAME
": no command found in bonding_masters. Use +ifname or -ifname.\n");
res = -EPERM;
/* Always return either count or an error. If you return 0, you'll
* get called forever, which is bad.
*/
out:
up_write(&(bonding_rwsem));
return res;
}
/* class attribute for bond_masters file. This ends up in /sys/class/net */
static CLASS_ATTR(bonding_masters, S_IWUSR | S_IRUGO,
bonding_show_bonds, bonding_store_bonds);
int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
{
char linkname[IFNAMSIZ+7];
int ret = 0;
/* first, create a link from the slave back to the master */
ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
"master");
if (ret)
return ret;
/* next, create a link from the master to the slave */
sprintf(linkname,"slave_%s",slave->name);
ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
linkname);
return ret;
}
void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave)
{
char linkname[IFNAMSIZ+7];
sysfs_remove_link(&(slave->dev.kobj), "master");
sprintf(linkname,"slave_%s",slave->name);
sysfs_remove_link(&(master->dev.kobj), linkname);
}
/*
* Show the slaves in the current bond.
*/
static ssize_t bonding_show_slaves(struct device *d,
struct device_attribute *attr, char *buf)
{
struct slave *slave;
int i, res = 0;
struct bonding *bond = to_bond(d);
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (res > (PAGE_SIZE - IFNAMSIZ)) {
/* not enough space for another interface name */
if ((PAGE_SIZE - res) > 10)
res = PAGE_SIZE - 10;
res += sprintf(buf + res, "++more++");
break;
}
res += sprintf(buf + res, "%s ", slave->dev->name);
}
read_unlock_bh(&bond->lock);
res += sprintf(buf + res, "\n");
res++;
return res;
}
/*
* Set the slaves in the current bond. The bond interface must be
* up for this to succeed.
* This function is largely the same flow as bonding_update_bonds().
*/
static ssize_t bonding_store_slaves(struct device *d,
struct device_attribute *attr,
const char *buffer, size_t count)
{
char command[IFNAMSIZ + 1] = { 0, };
char *ifname;
int i, res, found, ret = count;
struct slave *slave;
struct net_device *dev = NULL;
struct bonding *bond = to_bond(d);
/* Quick sanity check -- is the bond interface up? */
if (!(bond->dev->flags & IFF_UP)) {
printk(KERN_ERR DRV_NAME
": %s: Unable to update slaves because interface is down.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
/* Note: We can't hold bond->lock here, as bond_create grabs it. */
sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
ifname = command + 1;
if ((strlen(command) <= 1) ||
!dev_valid_name(ifname))
goto err_no_cmd;
if (command[0] == '+') {
/* Got a slave name in ifname. Is it already in the list? */
found = 0;
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i)
if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
printk(KERN_ERR DRV_NAME
": %s: Interface %s is already enslaved!\n",
bond->dev->name, ifname);
ret = -EPERM;
read_unlock_bh(&bond->lock);
goto out;
}
read_unlock_bh(&bond->lock);
printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
bond->dev->name, ifname);
dev = dev_get_by_name(ifname);
if (!dev) {
printk(KERN_INFO DRV_NAME
": %s: Interface %s does not exist!\n",
bond->dev->name, ifname);
ret = -EPERM;
goto out;
}
else
dev_put(dev);
if (dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
": %s: Error: Unable to enslave %s "
"because it is already up.\n",
bond->dev->name, dev->name);
ret = -EPERM;
goto out;
}
/* If this is the first slave, then we need to set
the master's hardware address to be the same as the
slave's. */
if (!(*((u32 *) & (bond->dev->dev_addr[0])))) {
memcpy(bond->dev->dev_addr, dev->dev_addr,
dev->addr_len);
}
/* Set the slave's MTU to match the bond */
if (dev->mtu != bond->dev->mtu) {
if (dev->change_mtu) {
res = dev->change_mtu(dev,
bond->dev->mtu);
if (res) {
ret = res;
goto out;
}
} else {
dev->mtu = bond->dev->mtu;
}
}
rtnl_lock();
res = bond_enslave(bond->dev, dev);
rtnl_unlock();
if (res) {
ret = res;
}
goto out;
}
if (command[0] == '-') {
dev = NULL;
bond_for_each_slave(bond, slave, i)
if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
dev = slave->dev;
break;
}
if (dev) {
printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
bond->dev->name, dev->name);
rtnl_lock();
res = bond_release(bond->dev, dev);
rtnl_unlock();
if (res) {
ret = res;
goto out;
}
/* set the slave MTU to the default */
if (dev->change_mtu) {
dev->change_mtu(dev, 1500);
} else {
dev->mtu = 1500;
}
}
else {
printk(KERN_ERR DRV_NAME ": unable to remove non-existent slave %s for bond %s.\n",
ifname, bond->dev->name);
ret = -ENODEV;
}
goto out;
}
err_no_cmd:
printk(KERN_ERR DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
ret = -EPERM;
out:
return ret;
}
static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves, bonding_store_slaves);
/*
* Show and set the bonding mode. The bond interface must be down to
* change the mode.
*/
static ssize_t bonding_show_mode(struct device *d,
struct device_attribute *attr, char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
bond_mode_tbl[bond->params.mode].modename,
bond->params.mode) + 1;
}
static ssize_t bonding_store_mode(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (bond->dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
": unable to update mode of %s because interface is up.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
new_value = bond_parse_parm((char *)buf, bond_mode_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid mode value %.*s.\n",
bond->dev->name,
(int)strlen(buf) - 1, buf);
ret = -EINVAL;
goto out;
} else {
if (bond->params.mode == BOND_MODE_8023AD)
bond_unset_master_3ad_flags(bond);
if (bond->params.mode == BOND_MODE_ALB)
bond_unset_master_alb_flags(bond);
bond->params.mode = new_value;
bond_set_mode_ops(bond, bond->params.mode);
printk(KERN_INFO DRV_NAME ": %s: setting mode to %s (%d).\n",
bond->dev->name, bond_mode_tbl[new_value].modename, new_value);
}
out:
return ret;
}
static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, bonding_show_mode, bonding_store_mode);
/*
* Show and set the bonding transmit hash method. The bond interface must be down to
* change the xmit hash policy.
*/
static ssize_t bonding_show_xmit_hash(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count;
struct bonding *bond = to_bond(d);
if ((bond->params.mode != BOND_MODE_XOR) &&
(bond->params.mode != BOND_MODE_8023AD)) {
// Not Applicable
count = sprintf(buf, "NA\n") + 1;
} else {
count = sprintf(buf, "%s %d\n",
xmit_hashtype_tbl[bond->params.xmit_policy].modename,
bond->params.xmit_policy) + 1;
}
return count;
}
static ssize_t bonding_store_xmit_hash(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (bond->dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
"%s: Interface is up. Unable to update xmit policy.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if ((bond->params.mode != BOND_MODE_XOR) &&
(bond->params.mode != BOND_MODE_8023AD)) {
printk(KERN_ERR DRV_NAME
"%s: Transmit hash policy is irrelevant in this mode.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
new_value = bond_parse_parm((char *)buf, xmit_hashtype_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid xmit hash policy value %.*s.\n",
bond->dev->name,
(int)strlen(buf) - 1, buf);
ret = -EINVAL;
goto out;
} else {
bond->params.xmit_policy = new_value;
bond_set_mode_ops(bond, bond->params.mode);
printk(KERN_INFO DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
bond->dev->name, xmit_hashtype_tbl[new_value].modename, new_value);
}
out:
return ret;
}
static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
/*
* Show and set arp_validate.
*/
static ssize_t bonding_show_arp_validate(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
arp_validate_tbl[bond->params.arp_validate].modename,
bond->params.arp_validate) + 1;
}
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);
new_value = bond_parse_parm((char *)buf, arp_validate_tbl);
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid arp_validate value %s\n",
bond->dev->name, buf);
return -EINVAL;
}
if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
printk(KERN_ERR DRV_NAME
": %s: arp_validate only supported in active-backup mode.\n",
bond->dev->name);
return -EINVAL;
}
printk(KERN_INFO DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
bond->dev->name, arp_validate_tbl[new_value].modename,
new_value);
if (!bond->params.arp_validate && new_value) {
bond_register_arp(bond);
} else if (bond->params.arp_validate && !new_value) {
bond_unregister_arp(bond);
}
bond->params.arp_validate = new_value;
return count;
}
static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
/*
* Show and set the arp timer interval. There are two tricky bits
* here. First, if ARP monitoring is activated, then we must disable
* MII monitoring. Second, if the ARP timer isn't running, we must
* start it.
*/
static ssize_t bonding_show_arp_interval(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.arp_interval) + 1;
}
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);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no arp_interval value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
bond->dev->name, new_value, INT_MAX);
ret = -EINVAL;
goto out;
}
printk(KERN_INFO DRV_NAME
": %s: Setting ARP monitoring interval to %d.\n",
bond->dev->name, new_value);
bond->params.arp_interval = new_value;
if (bond->params.miimon) {
printk(KERN_INFO DRV_NAME
": %s: ARP monitoring cannot be used with MII monitoring. "
"%s Disabling MII monitoring.\n",
bond->dev->name, bond->dev->name);
bond->params.miimon = 0;
/* Kill MII timer, else it brings bond's link down */
if (bond->arp_timer.function) {
printk(KERN_INFO DRV_NAME
": %s: Kill MII timer, else it brings bond's link down...\n",
bond->dev->name);
del_timer_sync(&bond->mii_timer);
}
}
if (!bond->params.arp_targets[0]) {
printk(KERN_INFO DRV_NAME
": %s: ARP monitoring has been set up, "
"but no ARP targets have been specified.\n",
bond->dev->name);
}
if (bond->dev->flags & IFF_UP) {
/* If the interface is up, we may need to fire off
* the ARP timer. If the interface is down, the
* timer will get fired off when the open function
* is called.
*/
if (bond->arp_timer.function) {
/* The timer's already set up, so fire it off */
mod_timer(&bond->arp_timer, jiffies + 1);
} else {
/* Set up the timer. */
init_timer(&bond->arp_timer);
bond->arp_timer.expires = jiffies + 1;
bond->arp_timer.data =
(unsigned long) bond->dev;
if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
bond->arp_timer.function =
(void *)
&bond_activebackup_arp_mon;
} else {
bond->arp_timer.function =
(void *)
&bond_loadbalance_arp_mon;
}
add_timer(&bond->arp_timer);
}
}
out:
return ret;
}
static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR , bonding_show_arp_interval, bonding_store_arp_interval);
/*
* Show and set the arp targets.
*/
static ssize_t bonding_show_arp_targets(struct device *d,
struct device_attribute *attr,
char *buf)
{
int i, res = 0;
struct bonding *bond = to_bond(d);
for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
if (bond->params.arp_targets[i])
res += sprintf(buf + res, "%u.%u.%u.%u ",
NIPQUAD(bond->params.arp_targets[i]));
}
if (res)
res--; /* eat the leftover space */
res += sprintf(buf + res, "\n");
res++;
return res;
}
static ssize_t bonding_store_arp_targets(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
u32 newtarget;
int i = 0, done = 0, ret = count;
struct bonding *bond = to_bond(d);
u32 *targets;
targets = bond->params.arp_targets;
newtarget = in_aton(buf + 1);
/* look for adds */
if (buf[0] == '+') {
if ((newtarget == 0) || (newtarget == INADDR_BROADCAST)) {
printk(KERN_ERR DRV_NAME
": %s: invalid ARP target %u.%u.%u.%u specified for addition\n",
bond->dev->name, NIPQUAD(newtarget));
ret = -EINVAL;
goto out;
}
/* look for an empty slot to put the target in, and check for dupes */
for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
if (targets[i] == newtarget) { /* duplicate */
printk(KERN_ERR DRV_NAME
": %s: ARP target %u.%u.%u.%u is already present\n",
bond->dev->name, NIPQUAD(newtarget));
if (done)
targets[i] = 0;
ret = -EINVAL;
goto out;
}
if (targets[i] == 0 && !done) {
printk(KERN_INFO DRV_NAME
": %s: adding ARP target %d.%d.%d.%d.\n",
bond->dev->name, NIPQUAD(newtarget));
done = 1;
targets[i] = newtarget;
}
}
if (!done) {
printk(KERN_ERR DRV_NAME
": %s: ARP target table is full!\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
}
else if (buf[0] == '-') {
if ((newtarget == 0) || (newtarget == INADDR_BROADCAST)) {
printk(KERN_ERR DRV_NAME
": %s: invalid ARP target %d.%d.%d.%d specified for removal\n",
bond->dev->name, NIPQUAD(newtarget));
ret = -EINVAL;
goto out;
}
for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
if (targets[i] == newtarget) {
printk(KERN_INFO DRV_NAME
": %s: removing ARP target %d.%d.%d.%d.\n",
bond->dev->name, NIPQUAD(newtarget));
targets[i] = 0;
done = 1;
}
}
if (!done) {
printk(KERN_INFO DRV_NAME
": %s: unable to remove nonexistent ARP target %d.%d.%d.%d.\n",
bond->dev->name, NIPQUAD(newtarget));
ret = -EINVAL;
goto out;
}
}
else {
printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
out:
return ret;
}
static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
/*
* Show and set the up and down delays. These must be multiples of the
* MII monitoring value, and are stored internally as the multiplier.
* Thus, we must translate to MS for the real world.
*/
static ssize_t bonding_show_downdelay(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
}
static ssize_t bonding_store_downdelay(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (!(bond->params.miimon)) {
printk(KERN_ERR DRV_NAME
": %s: Unable to set down delay as MII monitoring is disabled\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no down delay value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
bond->dev->name, new_value, 1, INT_MAX);
ret = -EINVAL;
goto out;
} else {
if ((new_value % bond->params.miimon) != 0) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: down delay (%d) is not a multiple "
"of miimon (%d), delay rounded to %d ms\n",
bond->dev->name, new_value, bond->params.miimon,
(new_value / bond->params.miimon) *
bond->params.miimon);
}
bond->params.downdelay = new_value / bond->params.miimon;
printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
bond->dev->name, bond->params.downdelay * bond->params.miimon);
}
out:
return ret;
}
static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
static ssize_t bonding_show_updelay(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
}
static ssize_t bonding_store_updelay(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (!(bond->params.miimon)) {
printk(KERN_ERR DRV_NAME
": %s: Unable to set up delay as MII monitoring is disabled\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no up delay value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
bond->dev->name, new_value, 1, INT_MAX);
ret = -EINVAL;
goto out;
} else {
if ((new_value % bond->params.miimon) != 0) {
printk(KERN_WARNING DRV_NAME
": %s: Warning: up delay (%d) is not a multiple "
"of miimon (%d), updelay rounded to %d ms\n",
bond->dev->name, new_value, bond->params.miimon,
(new_value / bond->params.miimon) *
bond->params.miimon);
}
bond->params.updelay = new_value / bond->params.miimon;
printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
bond->dev->name, bond->params.updelay * bond->params.miimon);
}
out:
return ret;
}
static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
/*
* Show and set the LACP interval. Interface must be down, and the mode
* must be set to 802.3ad mode.
*/
static ssize_t bonding_show_lacp(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%s %d\n",
bond_lacp_tbl[bond->params.lacp_fast].modename,
bond->params.lacp_fast) + 1;
}
static ssize_t bonding_store_lacp(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (bond->dev->flags & IFF_UP) {
printk(KERN_ERR DRV_NAME
": %s: Unable to update LACP rate because interface is up.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
if (bond->params.mode != BOND_MODE_8023AD) {
printk(KERN_ERR DRV_NAME
": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
bond->dev->name);
ret = -EPERM;
goto out;
}
new_value = bond_parse_parm((char *)buf, bond_lacp_tbl);
if ((new_value == 1) || (new_value == 0)) {
bond->params.lacp_fast = new_value;
printk(KERN_INFO DRV_NAME
": %s: Setting LACP rate to %s (%d).\n",
bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
} else {
printk(KERN_ERR DRV_NAME
": %s: Ignoring invalid LACP rate value %.*s.\n",
bond->dev->name, (int)strlen(buf) - 1, buf);
ret = -EINVAL;
}
out:
return ret;
}
static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
/*
* Show and set the MII monitor interval. There are two tricky bits
* here. First, if MII monitoring is activated, then we must disable
* ARP monitoring. Second, if the timer isn't running, we must
* start it.
*/
static ssize_t bonding_show_miimon(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.miimon) + 1;
}
static ssize_t bonding_store_miimon(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no miimon value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if (new_value < 0) {
printk(KERN_ERR DRV_NAME
": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
bond->dev->name, new_value, 1, INT_MAX);
ret = -EINVAL;
goto out;
} else {
printk(KERN_INFO DRV_NAME
": %s: Setting MII monitoring interval to %d.\n",
bond->dev->name, new_value);
bond->params.miimon = new_value;
if(bond->params.updelay)
printk(KERN_INFO DRV_NAME
": %s: Note: Updating updelay (to %d) "
"since it is a multiple of the miimon value.\n",
bond->dev->name,
bond->params.updelay * bond->params.miimon);
if(bond->params.downdelay)
printk(KERN_INFO DRV_NAME
": %s: Note: Updating downdelay (to %d) "
"since it is a multiple of the miimon value.\n",
bond->dev->name,
bond->params.downdelay * bond->params.miimon);
if (bond->params.arp_interval) {
printk(KERN_INFO DRV_NAME
": %s: MII monitoring cannot be used with "
"ARP monitoring. Disabling ARP monitoring...\n",
bond->dev->name);
bond->params.arp_interval = 0;
if (bond->params.arp_validate) {
bond_unregister_arp(bond);
bond->params.arp_validate =
BOND_ARP_VALIDATE_NONE;
}
/* Kill ARP timer, else it brings bond's link down */
if (bond->mii_timer.function) {
printk(KERN_INFO DRV_NAME
": %s: Kill ARP timer, else it brings bond's link down...\n",
bond->dev->name);
del_timer_sync(&bond->arp_timer);
}
}
if (bond->dev->flags & IFF_UP) {
/* If the interface is up, we may need to fire off
* the MII timer. If the interface is down, the
* timer will get fired off when the open function
* is called.
*/
if (bond->mii_timer.function) {
/* The timer's already set up, so fire it off */
mod_timer(&bond->mii_timer, jiffies + 1);
} else {
/* Set up the timer. */
init_timer(&bond->mii_timer);
bond->mii_timer.expires = jiffies + 1;
bond->mii_timer.data =
(unsigned long) bond->dev;
bond->mii_timer.function =
(void *) &bond_mii_monitor;
add_timer(&bond->mii_timer);
}
}
}
out:
return ret;
}
static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
/*
* Show and set the primary slave. The store function is much
* simpler than bonding_store_slaves function because it only needs to
* handle one interface name.
* The bond must be a mode that supports a primary for this be
* set.
*/
static ssize_t bonding_show_primary(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->primary_slave)
count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
else
count = sprintf(buf, "\n") + 1;
return count;
}
static ssize_t bonding_store_primary(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int i;
struct slave *slave;
struct bonding *bond = to_bond(d);
write_lock_bh(&bond->lock);
if (!USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: Unable to set primary slave; %s is in mode %d\n",
bond->dev->name, bond->dev->name, bond->params.mode);
} else {
bond_for_each_slave(bond, slave, i) {
if (strnicmp
(slave->dev->name, buf,
strlen(slave->dev->name)) == 0) {
printk(KERN_INFO DRV_NAME
": %s: Setting %s as primary slave.\n",
bond->dev->name, slave->dev->name);
bond->primary_slave = slave;
bond_select_active_slave(bond);
goto out;
}
}
/* if we got here, then we didn't match the name of any slave */
if (strlen(buf) == 0 || buf[0] == '\n') {
printk(KERN_INFO DRV_NAME
": %s: Setting primary slave to None.\n",
bond->dev->name);
bond->primary_slave = NULL;
bond_select_active_slave(bond);
} else {
printk(KERN_INFO DRV_NAME
": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
bond->dev->name, (int)strlen(buf) - 1, buf);
}
}
out:
write_unlock_bh(&bond->lock);
return count;
}
static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
/*
* Show and set the use_carrier flag.
*/
static ssize_t bonding_show_carrier(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct bonding *bond = to_bond(d);
return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
}
static ssize_t bonding_store_carrier(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int new_value, ret = count;
struct bonding *bond = to_bond(d);
if (sscanf(buf, "%d", &new_value) != 1) {
printk(KERN_ERR DRV_NAME
": %s: no use_carrier value specified.\n",
bond->dev->name);
ret = -EINVAL;
goto out;
}
if ((new_value == 0) || (new_value == 1)) {
bond->params.use_carrier = new_value;
printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
bond->dev->name, new_value);
} else {
printk(KERN_INFO DRV_NAME
": %s: Ignoring invalid use_carrier value %d.\n",
bond->dev->name, new_value);
}
out:
return count;
}
static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
/*
* Show and set currently active_slave.
*/
static ssize_t bonding_show_active_slave(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct slave *curr;
struct bonding *bond = to_bond(d);
int count;
read_lock(&bond->curr_slave_lock);
curr = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
if (USES_PRIMARY(bond->params.mode) && curr)
count = sprintf(buf, "%s\n", curr->dev->name) + 1;
else
count = sprintf(buf, "\n") + 1;
return count;
}
static ssize_t bonding_store_active_slave(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
int i;
struct slave *slave;
struct slave *old_active = NULL;
struct slave *new_active = NULL;
struct bonding *bond = to_bond(d);
write_lock_bh(&bond->lock);
if (!USES_PRIMARY(bond->params.mode)) {
printk(KERN_INFO DRV_NAME
": %s: Unable to change active slave; %s is in mode %d\n",
bond->dev->name, bond->dev->name, bond->params.mode);
} else {
bond_for_each_slave(bond, slave, i) {
if (strnicmp
(slave->dev->name, buf,
strlen(slave->dev->name)) == 0) {
old_active = bond->curr_active_slave;
new_active = slave;
if (new_active == old_active) {
/* do nothing */
printk(KERN_INFO DRV_NAME
": %s: %s is already the current active slave.\n",
bond->dev->name, slave->dev->name);
goto out;
}
else {
if ((new_active) &&
(old_active) &&
(new_active->link == BOND_LINK_UP) &&
IS_UP(new_active->dev)) {
printk(KERN_INFO DRV_NAME
": %s: Setting %s as active slave.\n",
bond->dev->name, slave->dev->name);
bond_change_active_slave(bond, new_active);
}
else {
printk(KERN_INFO DRV_NAME
": %s: Could not set %s as active slave; "
"either %s is down or the link is down.\n",
bond->dev->name, slave->dev->name,
slave->dev->name);
}
goto out;
}
}
}
/* if we got here, then we didn't match the name of any slave */
if (strlen(buf) == 0 || buf[0] == '\n') {
printk(KERN_INFO DRV_NAME
": %s: Setting active slave to None.\n",
bond->dev->name);
bond->primary_slave = NULL;
bond_select_active_slave(bond);
} else {
printk(KERN_INFO DRV_NAME
": %s: Unable to set %.*s as active slave as it is not a slave.\n",
bond->dev->name, (int)strlen(buf) - 1, buf);
}
}
out:
write_unlock_bh(&bond->lock);
return count;
}
static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
/*
* Show link status of the bond interface.
*/
static ssize_t bonding_show_mii_status(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct slave *curr;
struct bonding *bond = to_bond(d);
read_lock(&bond->curr_slave_lock);
curr = bond->curr_active_slave;
read_unlock(&bond->curr_slave_lock);
return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
}
static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
/*
* Show current 802.3ad aggregator ID.
*/
static ssize_t bonding_show_ad_aggregator(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.aggregator_id) + 1;
}
else
count = sprintf(buf, "\n") + 1;
return count;
}
static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
/*
* Show number of active 802.3ad ports.
*/
static ssize_t bonding_show_ad_num_ports(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0: ad_info.ports) + 1;
}
else
count = sprintf(buf, "\n") + 1;
return count;
}
static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
/*
* Show current 802.3ad actor key.
*/
static ssize_t bonding_show_ad_actor_key(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.actor_key) + 1;
}
else
count = sprintf(buf, "\n") + 1;
return count;
}
static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
/*
* Show current 802.3ad partner key.
*/
static ssize_t bonding_show_ad_partner_key(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ? 0 : ad_info.partner_key) + 1;
}
else
count = sprintf(buf, "\n") + 1;
return count;
}
static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
/*
* Show current 802.3ad partner mac.
*/
static ssize_t bonding_show_ad_partner_mac(struct device *d,
struct device_attribute *attr,
char *buf)
{
int count = 0;
struct bonding *bond = to_bond(d);
if (bond->params.mode == BOND_MODE_8023AD) {
struct ad_info ad_info;
if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
count = sprintf(buf,"%02x:%02x:%02x:%02x:%02x:%02x\n",
ad_info.partner_system[0],
ad_info.partner_system[1],
ad_info.partner_system[2],
ad_info.partner_system[3],
ad_info.partner_system[4],
ad_info.partner_system[5]) + 1;
}
}
else
count = sprintf(buf, "\n") + 1;
return count;
}
static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
static struct attribute *per_bond_attrs[] = {
&dev_attr_slaves.attr,
&dev_attr_mode.attr,
&dev_attr_arp_validate.attr,
&dev_attr_arp_interval.attr,
&dev_attr_arp_ip_target.attr,
&dev_attr_downdelay.attr,
&dev_attr_updelay.attr,
&dev_attr_lacp_rate.attr,
&dev_attr_xmit_hash_policy.attr,
&dev_attr_miimon.attr,
&dev_attr_primary.attr,
&dev_attr_use_carrier.attr,
&dev_attr_active_slave.attr,
&dev_attr_mii_status.attr,
&dev_attr_ad_aggregator.attr,
&dev_attr_ad_num_ports.attr,
&dev_attr_ad_actor_key.attr,
&dev_attr_ad_partner_key.attr,
&dev_attr_ad_partner_mac.attr,
NULL,
};
static struct attribute_group bonding_group = {
.name = "bonding",
.attrs = per_bond_attrs,
};
/*
* Initialize sysfs. This sets up the bonding_masters file in
* /sys/class/net.
*/
int bond_create_sysfs(void)
{
int ret = 0;
struct bonding *firstbond;
init_rwsem(&bonding_rwsem);
/* get the netdev class pointer */
firstbond = container_of(bond_dev_list.next, struct bonding, bond_list);
if (!firstbond)
return -ENODEV;
netdev_class = firstbond->dev->dev.class;
if (!netdev_class)
return -ENODEV;
ret = class_create_file(netdev_class, &class_attr_bonding_masters);
/*
* Permit multiple loads of the module by ignoring failures to
* create the bonding_masters sysfs file. Bonding devices
* created by second or subsequent loads of the module will
* not be listed in, or controllable by, bonding_masters, but
* will have the usual "bonding" sysfs directory.
*
* This is done to preserve backwards compatibility for
* initscripts/sysconfig, which load bonding multiple times to
* configure multiple bonding devices.
*/
if (ret == -EEXIST) {
netdev_class = NULL;
return 0;
}
return ret;
}
/*
* Remove /sys/class/net/bonding_masters.
*/
void bond_destroy_sysfs(void)
{
if (netdev_class)
class_remove_file(netdev_class, &class_attr_bonding_masters);
}
/*
* Initialize sysfs for each bond. This sets up and registers
* the 'bondctl' directory for each individual bond under /sys/class/net.
*/
int bond_create_sysfs_entry(struct bonding *bond)
{
struct net_device *dev = bond->dev;
int err;
err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
if (err) {
printk(KERN_EMERG "eek! didn't create group!\n");
}
if (expected_refcount < 1)
expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
return err;
}
/*
* Remove sysfs entries for each bond.
*/
void bond_destroy_sysfs_entry(struct bonding *bond)
{
struct net_device *dev = bond->dev;
sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
}
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