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linux-sg2042
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[IPV4]: Add default config support after inetdev_init 

Previously once inetdev_init has been called on a device any changes
made to ipv4_devconf_dflt would have no effect on that device's
configuration.

This creates a problem since we have moved the point where
inetdev_init is called from when an address is added to where the
device is registered.

This patch is the first half of a set that tries to mimic the old
behaviour while still calling inetdev_init.

It propagates any changes to ipv4_devconf_dflt to those devices that
have not had the corresponding attribute set.

The next patch will forcibly set all values at the point where
inetdev_init was previously called.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-06-04 23:35:37 -07:00 committed by David S. Miller
parent 42f811b8bc
commit 31be308541
2 changed files with 101 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/inetdevice.h
View File

@ -3,6 +3,7 @@
#ifdef __KERNEL__
#include <linux/bitmap.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
@ -12,6 +13,7 @@ struct ipv4_devconf
{
void *sysctl;
int data[__NET_IPV4_CONF_MAX - 1];
DECLARE_BITMAP(state, __NET_IPV4_CONF_MAX - 1);
};
extern struct ipv4_devconf ipv4_devconf;
@ -53,6 +55,7 @@ static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
int val)
{
index--;
set_bit(index, in_dev->cnf.state);
in_dev->cnf.data[index] = val;
}

133
net/ipv4/devinet.c
View File

@ -1244,6 +1244,91 @@ errout:
#ifdef CONFIG_SYSCTL
static void devinet_copy_dflt_conf(int i)
{
struct net_device *dev;
read_lock(&dev_base_lock);
for_each_netdev(dev) {
struct in_device *in_dev;
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev && !test_bit(i, in_dev->cnf.state))
in_dev->cnf.data[i] = ipv4_devconf_dflt.data[i];
rcu_read_unlock();
}
read_unlock(&dev_base_lock);
}
static int devinet_conf_proc(ctl_table *ctl, int write,
struct file* filp, void __user *buffer,
size_t *lenp, loff_t *ppos)
{
int ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
if (write) {
struct ipv4_devconf *cnf = ctl->extra1;
int i = (int *)ctl->data - cnf->data;
set_bit(i, cnf->state);
if (cnf == &ipv4_devconf_dflt)
devinet_copy_dflt_conf(i);
}
return ret;
}
static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
struct ipv4_devconf *cnf;
int *valp = table->data;
int new;
int i;
if (!newval || !newlen)
return 0;
if (newlen != sizeof(int))
return -EINVAL;
if (get_user(new, (int __user *)newval))
return -EFAULT;
if (new == *valp)
return 0;
if (oldval && oldlenp) {
size_t len;
if (get_user(len, oldlenp))
return -EFAULT;
if (len) {
if (len > table->maxlen)
len = table->maxlen;
if (copy_to_user(oldval, valp, len))
return -EFAULT;
if (put_user(len, oldlenp))
return -EFAULT;
}
}
*valp = new;
cnf = table->extra1;
i = (int *)table->data - cnf->data;
set_bit(i, cnf->state);
if (cnf == &ipv4_devconf_dflt)
devinet_copy_dflt_conf(i);
return 1;
}
void inet_forward_change(void)
{
struct net_device *dev;
@ -1302,40 +1387,13 @@ int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
int *valp = table->data;
int new;
int ret = devinet_conf_sysctl(table, name, nlen, oldval, oldlenp,
newval, newlen);
if (!newval || !newlen)
return 0;
if (newlen != sizeof(int))
return -EINVAL;
if (get_user(new, (int __user *)newval))
return -EFAULT;
if (new == *valp)
return 0;
if (oldval && oldlenp) {
size_t len;
if (get_user(len, oldlenp))
return -EFAULT;
if (len) {
if (len > table->maxlen)
len = table->maxlen;
if (copy_to_user(oldval, valp, len))
return -EFAULT;
if (put_user(len, oldlenp))
return -EFAULT;
}
}
*valp = new;
if (ret == 1)
rt_cache_flush(0);
return 1;
return ret;
}
@ -1349,13 +1407,16 @@ int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,
.mode = mval, \
.proc_handler = proc, \
.strategy = sysctl, \
.extra1 = &ipv4_devconf, \
}
#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
DEVINET_SYSCTL_ENTRY(attr, name, 0644, &proc_dointvec, NULL)
DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc, \
devinet_conf_sysctl)
#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
DEVINET_SYSCTL_ENTRY(attr, name, 0444, &proc_dointvec, NULL)
DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc, \
devinet_conf_sysctl)
#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc, sysctl) \
DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc, sysctl)
@ -1374,7 +1435,8 @@ static struct devinet_sysctl_table {
} devinet_sysctl = {
.devinet_vars = {
DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
devinet_sysctl_forward, NULL),
devinet_sysctl_forward,
devinet_conf_sysctl),
DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
@ -1448,6 +1510,7 @@ static void devinet_sysctl_register(struct in_device *in_dev,
return;
for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
t->devinet_vars[i].extra1 = p;
}
if (dev) {