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[NETFILTER]: arp_tables: netns preparation 

* Propagate netns from userspace.
* arpt_register_table() registers table in supplied netns.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2008-01-31 04:04:32 -08:00 committed by David S. Miller
parent 8280aa6182
commit 79df341ab6
3 changed files with 34 additions and 26 deletions
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3
include/linux/netfilter_arp/arp_tables.h
View File

@ -271,7 +271,8 @@ struct arpt_error
xt_register_target(tgt); })
#define arpt_unregister_target(tgt) xt_unregister_target(tgt)
extern struct arpt_table *arpt_register_table(struct arpt_table *table,
extern struct arpt_table *arpt_register_table(struct net *net,
struct arpt_table *table,
const struct arpt_replace *repl);
extern void arpt_unregister_table(struct arpt_table *table);
extern unsigned int arpt_do_table(struct sk_buff *skb,

55
net/ipv4/netfilter/arp_tables.c
View File

@ -22,6 +22,7 @@
#include <linux/mutex.h>
#include <linux/err.h>
#include <net/compat.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <linux/netfilter/x_tables.h>
@ -850,7 +851,7 @@ static int compat_table_info(const struct xt_table_info *info,
}
#endif
static int get_info(void __user *user, int *len, int compat)
static int get_info(struct net *net, void __user *user, int *len, int compat)
{
char name[ARPT_TABLE_MAXNAMELEN];
struct arpt_table *t;
@ -870,7 +871,7 @@ static int get_info(void __user *user, int *len, int compat)
if (compat)
xt_compat_lock(NF_ARP);
#endif
t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name),
t = try_then_request_module(xt_find_table_lock(net, NF_ARP, name),
"arptable_%s", name);
if (t && !IS_ERR(t)) {
struct arpt_getinfo info;
@ -908,7 +909,8 @@ static int get_info(void __user *user, int *len, int compat)
return ret;
}
static int get_entries(struct arpt_get_entries __user *uptr, int *len)
static int get_entries(struct net *net, struct arpt_get_entries __user *uptr,
int *len)
{
int ret;
struct arpt_get_entries get;
@ -926,7 +928,7 @@ static int get_entries(struct arpt_get_entries __user *uptr, int *len)
return -EINVAL;
}
t = xt_find_table_lock(&init_net, NF_ARP, get.name);
t = xt_find_table_lock(net, NF_ARP, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
duprintf("t->private->number = %u\n",
@ -947,7 +949,8 @@ static int get_entries(struct arpt_get_entries __user *uptr, int *len)
return ret;
}
static int __do_replace(const char *name, unsigned int valid_hooks,
static int __do_replace(struct net *net, const char *name,
unsigned int valid_hooks,
struct xt_table_info *newinfo,
unsigned int num_counters,
void __user *counters_ptr)
@ -966,7 +969,7 @@ static int __do_replace(const char *name, unsigned int valid_hooks,
goto out;
}
t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name),
t = try_then_request_module(xt_find_table_lock(net, NF_ARP, name),
"arptable_%s", name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
@ -1019,7 +1022,7 @@ static int __do_replace(const char *name, unsigned int valid_hooks,
return ret;
}
static int do_replace(void __user *user, unsigned int len)
static int do_replace(struct net *net, void __user *user, unsigned int len)
{
int ret;
struct arpt_replace tmp;
@ -1053,7 +1056,7 @@ static int do_replace(void __user *user, unsigned int len)
duprintf("arp_tables: Translated table\n");
ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo,
ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
tmp.num_counters, tmp.counters);
if (ret)
goto free_newinfo_untrans;
@ -1080,7 +1083,8 @@ static inline int add_counter_to_entry(struct arpt_entry *e,
return 0;
}
static int do_add_counters(void __user *user, unsigned int len, int compat)
static int do_add_counters(struct net *net, void __user *user, unsigned int len,
int compat)
{
unsigned int i;
struct xt_counters_info tmp;
@ -1132,7 +1136,7 @@ static int do_add_counters(void __user *user, unsigned int len, int compat)
goto free;
}
t = xt_find_table_lock(&init_net, NF_ARP, name);
t = xt_find_table_lock(net, NF_ARP, name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free;
@ -1435,7 +1439,8 @@ struct compat_arpt_replace {
struct compat_arpt_entry entries[0];
};
static int compat_do_replace(void __user *user, unsigned int len)
static int compat_do_replace(struct net *net, void __user *user,
unsigned int len)
{
int ret;
struct compat_arpt_replace tmp;
@ -1471,7 +1476,7 @@ static int compat_do_replace(void __user *user, unsigned int len)
duprintf("compat_do_replace: Translated table\n");
ret = __do_replace(tmp.name, tmp.valid_hooks, newinfo,
ret = __do_replace(net, tmp.name, tmp.valid_hooks, newinfo,
tmp.num_counters, compat_ptr(tmp.counters));
if (ret)
goto free_newinfo_untrans;
@ -1494,11 +1499,11 @@ static int compat_do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user,
switch (cmd) {
case ARPT_SO_SET_REPLACE:
ret = compat_do_replace(user, len);
ret = compat_do_replace(sk->sk_net, user, len);
break;
case ARPT_SO_SET_ADD_COUNTERS:
ret = do_add_counters(user, len, 1);
ret = do_add_counters(sk->sk_net, user, len, 1);
break;
default:
@ -1584,7 +1589,8 @@ struct compat_arpt_get_entries {
struct compat_arpt_entry entrytable[0];
};
static int compat_get_entries(struct compat_arpt_get_entries __user *uptr,
static int compat_get_entries(struct net *net,
struct compat_arpt_get_entries __user *uptr,
int *len)
{
int ret;
@ -1604,7 +1610,7 @@ static int compat_get_entries(struct compat_arpt_get_entries __user *uptr,
}
xt_compat_lock(NF_ARP);
t = xt_find_table_lock(&init_net, NF_ARP, get.name);
t = xt_find_table_lock(net, NF_ARP, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
struct xt_table_info info;
@ -1641,10 +1647,10 @@ static int compat_do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user,
switch (cmd) {
case ARPT_SO_GET_INFO:
ret = get_info(user, len, 1);
ret = get_info(sk->sk_net, user, len, 1);
break;
case ARPT_SO_GET_ENTRIES:
ret = compat_get_entries(user, len);
ret = compat_get_entries(sk->sk_net, user, len);
break;
default:
ret = do_arpt_get_ctl(sk, cmd, user, len);
@ -1662,11 +1668,11 @@ static int do_arpt_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned
switch (cmd) {
case ARPT_SO_SET_REPLACE:
ret = do_replace(user, len);
ret = do_replace(sk->sk_net, user, len);
break;
case ARPT_SO_SET_ADD_COUNTERS:
ret = do_add_counters(user, len, 0);
ret = do_add_counters(sk->sk_net, user, len, 0);
break;
default:
@ -1686,11 +1692,11 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
switch (cmd) {
case ARPT_SO_GET_INFO:
ret = get_info(user, len, 0);
ret = get_info(sk->sk_net, user, len, 0);
break;
case ARPT_SO_GET_ENTRIES:
ret = get_entries(user, len);
ret = get_entries(sk->sk_net, user, len);
break;
case ARPT_SO_GET_REVISION_TARGET: {
@ -1719,7 +1725,8 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
return ret;
}
struct arpt_table *arpt_register_table(struct arpt_table *table,
struct arpt_table *arpt_register_table(struct net *net,
struct arpt_table *table,
const struct arpt_replace *repl)
{
int ret;
@ -1749,7 +1756,7 @@ struct arpt_table *arpt_register_table(struct arpt_table *table,
if (ret != 0)
goto out_free;
new_table = xt_register_table(&init_net, table, &bootstrap, newinfo);
new_table = xt_register_table(net, table, &bootstrap, newinfo);
if (IS_ERR(new_table)) {
ret = PTR_ERR(new_table);
goto out_free;

2
net/ipv4/netfilter/arptable_filter.c
View File

@ -91,7 +91,7 @@ static int __init arptable_filter_init(void)
int ret;
/* Register table */
packet_filter = arpt_register_table(&__packet_filter, &initial_table.repl);
packet_filter = arpt_register_table(&init_net, &__packet_filter, &initial_table.repl);
if (IS_ERR(packet_filter))
return PTR_ERR(packet_filter);