mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
9d2a8fa96a
When I was fixing issues with unregisgtering tables under /proc/sys/net/ipv6/neigh by adding a mount point it appears I missed a critical ordering issue, in the ipv6 initialization. I had not realized that ipv6_sysctl_register is called at the very end of the ipv6 initialization and in particular after we call neigh_sysctl_register from ndisc_init. "neigh" needs to be initialized in ipv6_static_sysctl_register which is the first ipv6 table to initialized, and definitely before ndisc_init. This removes the weirdness of duplicate tables while still providing a "neigh" mount point which prevents races in sysctl unregistering. This was initially reported at https://bugzilla.kernel.org/show_bug.cgi?id=31232 Reported-by: sunkan@zappa.cx Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
177 lines
3.5 KiB
C
177 lines
3.5 KiB
C
/*
|
|
* sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
|
|
*
|
|
* Changes:
|
|
* YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/in6.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/slab.h>
|
|
#include <net/ndisc.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/inet_frag.h>
|
|
|
|
static struct ctl_table empty[1];
|
|
|
|
static ctl_table ipv6_static_skeleton[] = {
|
|
{
|
|
.procname = "neigh",
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = empty,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static ctl_table ipv6_table_template[] = {
|
|
{
|
|
.procname = "route",
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ipv6_route_table_template
|
|
},
|
|
{
|
|
.procname = "icmp",
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ipv6_icmp_table_template
|
|
},
|
|
{
|
|
.procname = "bindv6only",
|
|
.data = &init_net.ipv6.sysctl.bindv6only,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static ctl_table ipv6_rotable[] = {
|
|
{
|
|
.procname = "mld_max_msf",
|
|
.data = &sysctl_mld_max_msf,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{ }
|
|
};
|
|
|
|
struct ctl_path net_ipv6_ctl_path[] = {
|
|
{ .procname = "net", },
|
|
{ .procname = "ipv6", },
|
|
{ },
|
|
};
|
|
EXPORT_SYMBOL_GPL(net_ipv6_ctl_path);
|
|
|
|
static int __net_init ipv6_sysctl_net_init(struct net *net)
|
|
{
|
|
struct ctl_table *ipv6_table;
|
|
struct ctl_table *ipv6_route_table;
|
|
struct ctl_table *ipv6_icmp_table;
|
|
int err;
|
|
|
|
err = -ENOMEM;
|
|
ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
|
|
GFP_KERNEL);
|
|
if (!ipv6_table)
|
|
goto out;
|
|
|
|
ipv6_route_table = ipv6_route_sysctl_init(net);
|
|
if (!ipv6_route_table)
|
|
goto out_ipv6_table;
|
|
ipv6_table[0].child = ipv6_route_table;
|
|
|
|
ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
|
|
if (!ipv6_icmp_table)
|
|
goto out_ipv6_route_table;
|
|
ipv6_table[1].child = ipv6_icmp_table;
|
|
|
|
ipv6_table[2].data = &net->ipv6.sysctl.bindv6only;
|
|
|
|
net->ipv6.sysctl.table = register_net_sysctl_table(net, net_ipv6_ctl_path,
|
|
ipv6_table);
|
|
if (!net->ipv6.sysctl.table)
|
|
goto out_ipv6_icmp_table;
|
|
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
|
|
out_ipv6_icmp_table:
|
|
kfree(ipv6_icmp_table);
|
|
out_ipv6_route_table:
|
|
kfree(ipv6_route_table);
|
|
out_ipv6_table:
|
|
kfree(ipv6_table);
|
|
goto out;
|
|
}
|
|
|
|
static void __net_exit ipv6_sysctl_net_exit(struct net *net)
|
|
{
|
|
struct ctl_table *ipv6_table;
|
|
struct ctl_table *ipv6_route_table;
|
|
struct ctl_table *ipv6_icmp_table;
|
|
|
|
ipv6_table = net->ipv6.sysctl.table->ctl_table_arg;
|
|
ipv6_route_table = ipv6_table[0].child;
|
|
ipv6_icmp_table = ipv6_table[1].child;
|
|
|
|
unregister_net_sysctl_table(net->ipv6.sysctl.table);
|
|
|
|
kfree(ipv6_table);
|
|
kfree(ipv6_route_table);
|
|
kfree(ipv6_icmp_table);
|
|
}
|
|
|
|
static struct pernet_operations ipv6_sysctl_net_ops = {
|
|
.init = ipv6_sysctl_net_init,
|
|
.exit = ipv6_sysctl_net_exit,
|
|
};
|
|
|
|
static struct ctl_table_header *ip6_header;
|
|
|
|
int ipv6_sysctl_register(void)
|
|
{
|
|
int err = -ENOMEM;
|
|
|
|
ip6_header = register_net_sysctl_rotable(net_ipv6_ctl_path, ipv6_rotable);
|
|
if (ip6_header == NULL)
|
|
goto out;
|
|
|
|
err = register_pernet_subsys(&ipv6_sysctl_net_ops);
|
|
if (err)
|
|
goto err_pernet;
|
|
out:
|
|
return err;
|
|
|
|
err_pernet:
|
|
unregister_net_sysctl_table(ip6_header);
|
|
goto out;
|
|
}
|
|
|
|
void ipv6_sysctl_unregister(void)
|
|
{
|
|
unregister_net_sysctl_table(ip6_header);
|
|
unregister_pernet_subsys(&ipv6_sysctl_net_ops);
|
|
}
|
|
|
|
static struct ctl_table_header *ip6_base;
|
|
|
|
int ipv6_static_sysctl_register(void)
|
|
{
|
|
ip6_base = register_sysctl_paths(net_ipv6_ctl_path, ipv6_static_skeleton);
|
|
if (ip6_base == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void ipv6_static_sysctl_unregister(void)
|
|
{
|
|
unregister_net_sysctl_table(ip6_base);
|
|
}
|