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[INET]: Merge sys.net.ipv4.ip_forward and sys.net.ipv4.conf.all.forwarding

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AFAIS these two entries should do the same thing - change the
forwarding state on ipv4_devconf and on all the devices.

I propose to merge the handlers together using ctl paths.

The inet_forward_change() is static after this and I move
it higher to be closer to other "propagation" helpers and
to avoid diff making patches based on { and } matching :)
i.e. - make them easier to read.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-12-05 01:44:58 -08:00 committed by David S. Miller
parent 4d43b78ac2
commit 68dd299bc8
3 changed files with 44 additions and 88 deletions
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1
include/linux/inetdevice.h
View File

@ -135,7 +135,6 @@ extern struct in_device *inetdev_by_index(int);
extern __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
extern __be32 inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope);
extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
extern void inet_forward_change(void);
static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
{

66
net/ipv4/devinet.c
View File

@ -1263,6 +1263,28 @@ static void devinet_copy_dflt_conf(int i)
read_unlock(&dev_base_lock);
}
static void inet_forward_change(void)
{
struct net_device *dev;
int on = IPV4_DEVCONF_ALL(FORWARDING);
IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on;
IPV4_DEVCONF_DFLT(FORWARDING) = on;
read_lock(&dev_base_lock);
for_each_netdev(&init_net, dev) {
struct in_device *in_dev;
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev)
IN_DEV_CONF_SET(in_dev, FORWARDING, on);
rcu_read_unlock();
}
read_unlock(&dev_base_lock);
rt_cache_flush(0);
}
static int devinet_conf_proc(ctl_table *ctl, int write,
struct file* filp, void __user *buffer,
size_t *lenp, loff_t *ppos)
@ -1332,28 +1354,6 @@ static int devinet_conf_sysctl(ctl_table *table, int __user *name, int nlen,
return 1;
}
void inet_forward_change(void)
{
struct net_device *dev;
int on = IPV4_DEVCONF_ALL(FORWARDING);
IPV4_DEVCONF_ALL(ACCEPT_REDIRECTS) = !on;
IPV4_DEVCONF_DFLT(FORWARDING) = on;
read_lock(&dev_base_lock);
for_each_netdev(&init_net, dev) {
struct in_device *in_dev;
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev)
IN_DEV_CONF_SET(in_dev, FORWARDING, on);
rcu_read_unlock();
}
read_unlock(&dev_base_lock);
rt_cache_flush(0);
}
static int devinet_sysctl_forward(ctl_table *ctl, int write,
struct file* filp, void __user *buffer,
size_t *lenp, loff_t *ppos)
@ -1536,6 +1536,27 @@ static void devinet_sysctl_unregister(struct ipv4_devconf *p)
}
#endif
static struct ctl_table ctl_forward_entry[] = {
{
.ctl_name = NET_IPV4_FORWARD,
.procname = "ip_forward",
.data = &ipv4_devconf.data[
NET_IPV4_CONF_FORWARDING - 1],
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = devinet_sysctl_forward,
.strategy = devinet_conf_sysctl,
.extra1 = &ipv4_devconf,
},
{ },
};
static __initdata struct ctl_path net_ipv4_path[] = {
{ .procname = "net", .ctl_name = CTL_NET, },
{ .procname = "ipv4", .ctl_name = NET_IPV4, },
{ },
};
void __init devinet_init(void)
{
register_gifconf(PF_INET, inet_gifconf);
@ -1549,6 +1570,7 @@ void __init devinet_init(void)
&ipv4_devconf);
__devinet_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
&ipv4_devconf_dflt);
register_sysctl_paths(net_ipv4_path, ctl_forward_entry);
#endif
}

65
net/ipv4/sysctl_net_ipv4.c
View File

@ -27,62 +27,6 @@ static int tcp_retr1_max = 255;
static int ip_local_port_range_min[] = { 1, 1 };
static int ip_local_port_range_max[] = { 65535, 65535 };
static
int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int val = IPV4_DEVCONF_ALL(FORWARDING);
int ret;
ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
if (write && IPV4_DEVCONF_ALL(FORWARDING) != val)
inet_forward_change();
return ret;
}
static int ipv4_sysctl_forward_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;
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;
inet_forward_change();
return 1;
}
extern seqlock_t sysctl_port_range_lock;
extern int sysctl_local_port_range[2];
@ -281,15 +225,6 @@ static struct ctl_table ipv4_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.ctl_name = NET_IPV4_FORWARD,
.procname = "ip_forward",
.data = &IPV4_DEVCONF_ALL(FORWARDING),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &ipv4_sysctl_forward,
.strategy = &ipv4_sysctl_forward_strategy
},
{
.ctl_name = NET_IPV4_DEFAULT_TTL,
.procname = "ip_default_ttl",