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[IPV4]: Move the devinet pointers on the struct net

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This is the core.

Add all and default pointers on the netns_ipv4 and register
a new pernet subsys to initialize them.

Also add the ctl_table_header to register the
net.ipv4.ip_forward ctl.

I don't allocate additional memory for init_net, but use
global devinets.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-12-16 13:31:47 -08:00 committed by David S. Miller
parent c0ce9fb304
commit 752d14dc6a
2 changed files with 102 additions and 9 deletions
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6
include/net/netns/ipv4.h
View File

@ -4,6 +4,12 @@
#ifndef __NETNS_IPV4_H__
#define __NETNS_IPV4_H__
struct ctl_table_header;
struct ipv4_devconf;
struct netns_ipv4 {
struct ctl_table_header *forw_hdr;
struct ipv4_devconf *devconf_all;
struct ipv4_devconf *devconf_dflt;
};
#endif

105
net/ipv4/devinet.c
View File

@ -62,6 +62,7 @@
#include <net/route.h>
#include <net/ip_fib.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
struct ipv4_devconf ipv4_devconf = {
.data = {
@ -1497,7 +1498,7 @@ static int __devinet_sysctl_register(struct net *net, char *dev_name,
devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
devinet_ctl_path[DEVINET_CTL_PATH_DEV].ctl_name = ctl_name;
t->sysctl_header = register_sysctl_paths(devinet_ctl_path,
t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
t->devinet_vars);
if (!t->sysctl_header)
goto free_procname;
@ -1557,27 +1558,113 @@ static struct ctl_table ctl_forward_entry[] = {
{ },
};
static __initdata struct ctl_path net_ipv4_path[] = {
static __net_initdata struct ctl_path net_ipv4_path[] = {
{ .procname = "net", .ctl_name = CTL_NET, },
{ .procname = "ipv4", .ctl_name = NET_IPV4, },
{ },
};
static __net_init int devinet_init_net(struct net *net)
{
int err;
struct ctl_table *tbl;
struct ipv4_devconf *all, *dflt;
struct ctl_table_header *forw_hdr;
err = -ENOMEM;
all = &ipv4_devconf;
dflt = &ipv4_devconf_dflt;
tbl = ctl_forward_entry;
if (net != &init_net) {
all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
if (all == NULL)
goto err_alloc_all;
dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
if (dflt == NULL)
goto err_alloc_dflt;
tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
if (tbl == NULL)
goto err_alloc_ctl;
tbl[0].data = &all->data[NET_IPV4_CONF_FORWARDING - 1];
tbl[0].extra1 = all;
tbl[0].extra2 = net;
}
#ifdef CONFIG_SYSCTL
err = __devinet_sysctl_register(net, "all",
NET_PROTO_CONF_ALL, all);
if (err < 0)
goto err_reg_all;
err = __devinet_sysctl_register(net, "default",
NET_PROTO_CONF_DEFAULT, dflt);
if (err < 0)
goto err_reg_dflt;
err = -ENOMEM;
forw_hdr = register_net_sysctl_table(net, net_ipv4_path, tbl);
if (forw_hdr == NULL)
goto err_reg_ctl;
#endif
net->ipv4.forw_hdr = forw_hdr;
net->ipv4.devconf_all = all;
net->ipv4.devconf_dflt = dflt;
return 0;
#ifdef CONFIG_SYSCTL
err_reg_ctl:
__devinet_sysctl_unregister(dflt);
err_reg_dflt:
__devinet_sysctl_unregister(all);
err_reg_all:
if (tbl != ctl_forward_entry)
kfree(tbl);
#endif
err_alloc_ctl:
if (dflt != &ipv4_devconf_dflt)
kfree(dflt);
err_alloc_dflt:
if (all != &ipv4_devconf)
kfree(all);
err_alloc_all:
return err;
}
static __net_exit void devinet_exit_net(struct net *net)
{
struct ctl_table *tbl;
tbl = net->ipv4.forw_hdr->ctl_table_arg;
#ifdef CONFIG_SYSCTL
unregister_net_sysctl_table(net->ipv4.forw_hdr);
__devinet_sysctl_unregister(net->ipv4.devconf_dflt);
__devinet_sysctl_unregister(net->ipv4.devconf_all);
#endif
kfree(tbl);
kfree(net->ipv4.devconf_dflt);
kfree(net->ipv4.devconf_all);
}
static __net_initdata struct pernet_operations devinet_ops = {
.init = devinet_init_net,
.exit = devinet_exit_net,
};
void __init devinet_init(void)
{
register_pernet_subsys(&devinet_ops);
register_gifconf(PF_INET, inet_gifconf);
register_netdevice_notifier(&ip_netdev_notifier);
rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL);
rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL);
rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr);
#ifdef CONFIG_SYSCTL
__devinet_sysctl_register(&init_net, "all", NET_PROTO_CONF_ALL,
&ipv4_devconf);
__devinet_sysctl_register(&init_net, "default", NET_PROTO_CONF_DEFAULT,
&ipv4_devconf_dflt);
register_sysctl_paths(net_ipv4_path, ctl_forward_entry);
#endif
}
EXPORT_SYMBOL(in_dev_finish_destroy);