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SmartisanOS_Kernel_Source/net/sysctl_net.c at master · luckmonkey/SmartisanOS_Kernel_Source · GitHub
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sysctl_net.c
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net
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sysctl_net.c
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/* -*- linux-c -*-
* sysctl_net.c: sysctl interface to net subsystem.
*
* Begun April 1, 1996, Mike Shaver.
* Added /proc/sys/net directories for each protocol family. [MS]
*
* Revision 1.2 1996/05/08 20:24:40 shaver
* Added bits for NET_BRIDGE and the NET_IPV4_ARP stuff and
* NET_IPV4_IP_FORWARD.
*
*
*/
#include
<linux/mm.h>
#include
<linux/export.h>
#include
<linux/sysctl.h>
#include
<linux/nsproxy.h>
#include
<net/sock.h>
#ifdef
CONFIG_INET
#include
<net/ip.h>
#endif
#ifdef
CONFIG_NET
#include
<linux/if_ether.h>
#endif
#ifdef
CONFIG_TR
#include
<linux/if_tr.h>
#endif
static
struct
ctl_table_set
*
net_ctl_header_lookup
(
struct
ctl_table_root
*
root
,
struct
nsproxy
*
namespaces
)
{
return
&
namespaces
->
net_ns
->
sysctls
;
}
static
int
is_seen
(
struct
ctl_table_set
*
set
)
{
return
&
current
->
nsproxy
->
net_ns
->
sysctls
==
set
;
}
/* Return standard mode bits for table entry. */
static
int
net_ctl_permissions
(
struct
ctl_table_root
*
root
,
struct
nsproxy
*
nsproxy
,
struct
ctl_table
*
table
)
{
/* Allow network administrator to have same access as root. */
if
(
capable
(
CAP_NET_ADMIN
)) {
int
mode
=
(
table
->
mode
>>
6
)
&
7
;
return
(
mode
<<
6
) | (
mode
<<
3
) |
mode
;
}
return
table
->
mode
;
}
static
struct
ctl_table_root
net_sysctl_root
=
{
.
lookup
=
net_ctl_header_lookup
,
.
permissions
=
net_ctl_permissions
,
};
static
int
net_ctl_ro_header_perms
(
struct
ctl_table_root
*
root
,
struct
nsproxy
*
namespaces
,
struct
ctl_table
*
table
)
{
if
(
net_eq
(
namespaces
->
net_ns
,
&
init_net
))
return
table
->
mode
;
else
return
table
->
mode
&
~
0222
;
}
static
struct
ctl_table_root
net_sysctl_ro_root
=
{
.
permissions
=
net_ctl_ro_header_perms
,
};
static
int
__net_init
sysctl_net_init
(
struct
net
*
net
)
{
setup_sysctl_set
(
&
net
->
sysctls
,
&
net_sysctl_root
,
is_seen
);
return
0
;
}
static
void
__net_exit
sysctl_net_exit
(
struct
net
*
net
)
{
retire_sysctl_set
(
&
net
->
sysctls
);
}
static
struct
pernet_operations
sysctl_pernet_ops
=
{
.
init
=
sysctl_net_init
,
.
exit
=
sysctl_net_exit
,
};
static
__init
int
net_sysctl_init
(
void
)
{
int
ret
;
ret
=
register_pernet_subsys
(
&
sysctl_pernet_ops
);
if
(
ret
)
goto
out
;
setup_sysctl_set
(
&
net_sysctl_ro_root
.
default_set
,
&
net_sysctl_ro_root
,
NULL
);
register_sysctl_root
(
&
net_sysctl_ro_root
);
register_sysctl_root
(
&
net_sysctl_root
);
out
:
return
ret
;
}
subsys_initcall
(
net_sysctl_init
);
struct
ctl_table_header
*
register_net_sysctl_table
(
struct
net
*
net
,
const
struct
ctl_path
*
path
,
struct
ctl_table
*
table
)
{
return
__register_sysctl_paths
(
&
net
->
sysctls
,
path
,
table
);
}
EXPORT_SYMBOL_GPL
(
register_net_sysctl_table
);
struct
ctl_table_header
*
register_net_sysctl_rotable
(
const
struct
ctl_path
*
path
,
struct
ctl_table
*
table
)
{
return
__register_sysctl_paths
(
&
net_sysctl_ro_root
.
default_set
,
path
,
table
);
}
EXPORT_SYMBOL_GPL
(
register_net_sysctl_rotable
);
void
unregister_net_sysctl_table
(
struct
ctl_table_header
*
header
)
{
unregister_sysctl_table
(
header
);
}
EXPORT_SYMBOL_GPL
(
unregister_net_sysctl_table
);
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