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[NETFILTER]: x_tables: per-netns xt_tables 

In fact all we want is per-netns set of rules, however doing that will
unnecessary complicate routines such as ipt_hook()/ipt_do_table, so
make full xt_table array per-netns.

Every user stubbed with init_net for a while.

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 04:02:13 -08:00 committed by David S. Miller
parent a98da11d88
commit 8d87005207
7 changed files with 60 additions and 30 deletions
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6
include/linux/netfilter/x_tables.h
View File

@ -335,7 +335,8 @@ extern int xt_check_target(const struct xt_target *target, unsigned short family
unsigned int size, const char *table, unsigned int hook,
unsigned short proto, int inv_proto);
extern struct xt_table *xt_register_table(struct xt_table *table,
extern struct xt_table *xt_register_table(struct net *net,
struct xt_table *table,
struct xt_table_info *bootstrap,
struct xt_table_info *newinfo);
extern void *xt_unregister_table(struct xt_table *table);
@ -352,7 +353,8 @@ extern struct xt_target *xt_request_find_target(int af, const char *name,
extern int xt_find_revision(int af, const char *name, u8 revision, int target,
int *err);
extern struct xt_table *xt_find_table_lock(int af, const char *name);
extern struct xt_table *xt_find_table_lock(struct net *net, int af,
const char *name);
extern void xt_table_unlock(struct xt_table *t);
extern int xt_proto_init(int af);

4
include/net/net_namespace.h
View File

@ -12,6 +12,7 @@
#include <net/netns/packet.h>
#include <net/netns/ipv4.h>
#include <net/netns/ipv6.h>
#include <net/netns/x_tables.h>
struct proc_dir_entry;
struct net_device;
@ -56,6 +57,9 @@ struct net {
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
struct netns_ipv6 ipv6;
#endif
#ifdef CONFIG_NETFILTER
struct netns_xt xt;
#endif
};
#ifdef CONFIG_NET

10
include/net/netns/x_tables.h Normal file
View File

@ -0,0 +1,10 @@
#ifndef __NETNS_X_TABLES_H
#define __NETNS_X_TABLES_H
#include <linux/list.h>
#include <linux/net.h>
struct netns_xt {
struct list_head tables[NPROTO];
};
#endif

12
net/ipv4/netfilter/arp_tables.c
View File

@ -870,7 +870,7 @@ 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(NF_ARP, name),
t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name),
"arptable_%s", name);
if (t && !IS_ERR(t)) {
struct arpt_getinfo info;
@ -926,7 +926,7 @@ static int get_entries(struct arpt_get_entries __user *uptr, int *len)
return -EINVAL;
}
t = xt_find_table_lock(NF_ARP, get.name);
t = xt_find_table_lock(&init_net, NF_ARP, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
duprintf("t->private->number = %u\n",
@ -966,7 +966,7 @@ static int __do_replace(const char *name, unsigned int valid_hooks,
goto out;
}
t = try_then_request_module(xt_find_table_lock(NF_ARP, name),
t = try_then_request_module(xt_find_table_lock(&init_net, NF_ARP, name),
"arptable_%s", name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
@ -1132,7 +1132,7 @@ static int do_add_counters(void __user *user, unsigned int len, int compat)
goto free;
}
t = xt_find_table_lock(NF_ARP, name);
t = xt_find_table_lock(&init_net, NF_ARP, name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free;
@ -1604,7 +1604,7 @@ static int compat_get_entries(struct compat_arpt_get_entries __user *uptr,
}
xt_compat_lock(NF_ARP);
t = xt_find_table_lock(NF_ARP, get.name);
t = xt_find_table_lock(&init_net, NF_ARP, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
struct xt_table_info info;
@ -1751,7 +1751,7 @@ int arpt_register_table(struct arpt_table *table,
return ret;
}
new_table = xt_register_table(table, &bootstrap, newinfo);
new_table = xt_register_table(&init_net, table, &bootstrap, newinfo);
if (IS_ERR(new_table)) {
xt_free_table_info(newinfo);
return PTR_ERR(new_table);

12
net/ipv4/netfilter/ip_tables.c
View File

@ -1112,7 +1112,7 @@ static int get_info(void __user *user, int *len, int compat)
if (compat)
xt_compat_lock(AF_INET);
#endif
t = try_then_request_module(xt_find_table_lock(AF_INET, name),
t = try_then_request_module(xt_find_table_lock(&init_net, AF_INET, name),
"iptable_%s", name);
if (t && !IS_ERR(t)) {
struct ipt_getinfo info;
@ -1170,7 +1170,7 @@ get_entries(struct ipt_get_entries __user *uptr, int *len)
return -EINVAL;
}
t = xt_find_table_lock(AF_INET, get.name);
t = xt_find_table_lock(&init_net, AF_INET, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
duprintf("t->private->number = %u\n", private->number);
@ -1208,7 +1208,7 @@ __do_replace(const char *name, unsigned int valid_hooks,
goto out;
}
t = try_then_request_module(xt_find_table_lock(AF_INET, name),
t = try_then_request_module(xt_find_table_lock(&init_net, AF_INET, name),
"iptable_%s", name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
@ -1383,7 +1383,7 @@ do_add_counters(void __user *user, unsigned int len, int compat)
goto free;
}
t = xt_find_table_lock(AF_INET, name);
t = xt_find_table_lock(&init_net, AF_INET, name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free;
@ -1924,7 +1924,7 @@ compat_get_entries(struct compat_ipt_get_entries __user *uptr, int *len)
}
xt_compat_lock(AF_INET);
t = xt_find_table_lock(AF_INET, get.name);
t = xt_find_table_lock(&init_net, AF_INET, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
struct xt_table_info info;
@ -2075,7 +2075,7 @@ int ipt_register_table(struct xt_table *table, const struct ipt_replace *repl)
return ret;
}
new_table = xt_register_table(table, &bootstrap, newinfo);
new_table = xt_register_table(&init_net, table, &bootstrap, newinfo);
if (IS_ERR(new_table)) {
xt_free_table_info(newinfo);
return PTR_ERR(new_table);

12
net/ipv6/netfilter/ip6_tables.c
View File

@ -1138,7 +1138,7 @@ static int get_info(void __user *user, int *len, int compat)
if (compat)
xt_compat_lock(AF_INET6);
#endif
t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
t = try_then_request_module(xt_find_table_lock(&init_net, AF_INET6, name),
"ip6table_%s", name);
if (t && !IS_ERR(t)) {
struct ip6t_getinfo info;
@ -1196,7 +1196,7 @@ get_entries(struct ip6t_get_entries __user *uptr, int *len)
return -EINVAL;
}
t = xt_find_table_lock(AF_INET6, get.name);
t = xt_find_table_lock(&init_net, AF_INET6, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
duprintf("t->private->number = %u\n", private->number);
@ -1235,7 +1235,7 @@ __do_replace(const char *name, unsigned int valid_hooks,
goto out;
}
t = try_then_request_module(xt_find_table_lock(AF_INET6, name),
t = try_then_request_module(xt_find_table_lock(&init_net, AF_INET6, name),
"ip6table_%s", name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
@ -1410,7 +1410,7 @@ do_add_counters(void __user *user, unsigned int len, int compat)
goto free;
}
t = xt_find_table_lock(AF_INET6, name);
t = xt_find_table_lock(&init_net, AF_INET6, name);
if (!t || IS_ERR(t)) {
ret = t ? PTR_ERR(t) : -ENOENT;
goto free;
@ -1950,7 +1950,7 @@ compat_get_entries(struct compat_ip6t_get_entries __user *uptr, int *len)
}
xt_compat_lock(AF_INET6);
t = xt_find_table_lock(AF_INET6, get.name);
t = xt_find_table_lock(&init_net, AF_INET6, get.name);
if (t && !IS_ERR(t)) {
struct xt_table_info *private = t->private;
struct xt_table_info info;
@ -2101,7 +2101,7 @@ int ip6t_register_table(struct xt_table *table, const struct ip6t_replace *repl)
return ret;
}
new_table = xt_register_table(table, &bootstrap, newinfo);
new_table = xt_register_table(&init_net, table, &bootstrap, newinfo);
if (IS_ERR(new_table)) {
xt_free_table_info(newinfo);
return PTR_ERR(new_table);

34
net/netfilter/x_tables.c
View File

@ -44,7 +44,6 @@ struct xt_af {
struct mutex mutex;
struct list_head match;
struct list_head target;
struct list_head tables;
#ifdef CONFIG_COMPAT
struct mutex compat_mutex;
struct compat_delta *compat_offsets;
@ -597,14 +596,14 @@ void xt_free_table_info(struct xt_table_info *info)
EXPORT_SYMBOL(xt_free_table_info);
/* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
struct xt_table *xt_find_table_lock(int af, const char *name)
struct xt_table *xt_find_table_lock(struct net *net, int af, const char *name)
{
struct xt_table *t;
if (mutex_lock_interruptible(&xt[af].mutex) != 0)
return ERR_PTR(-EINTR);
list_for_each_entry(t, &xt[af].tables, list)
list_for_each_entry(t, &net->xt.tables[af], list)
if (strcmp(t->name, name) == 0 && try_module_get(t->me))
return t;
mutex_unlock(&xt[af].mutex);
@ -660,7 +659,7 @@ xt_replace_table(struct xt_table *table,
}
EXPORT_SYMBOL_GPL(xt_replace_table);
struct xt_table *xt_register_table(struct xt_table *table,
struct xt_table *xt_register_table(struct net *net, struct xt_table *table,
struct xt_table_info *bootstrap,
struct xt_table_info *newinfo)
{
@ -673,7 +672,7 @@ struct xt_table *xt_register_table(struct xt_table *table,
goto out;
/* Don't autoload: we'd eat our tail... */
list_for_each_entry(t, &xt[table->af].tables, list) {
list_for_each_entry(t, &net->xt.tables[table->af], list) {
if (strcmp(t->name, table->name) == 0) {
ret = -EEXIST;
goto unlock;
@ -692,7 +691,7 @@ struct xt_table *xt_register_table(struct xt_table *table,
/* save number of initial entries */
private->initial_entries = private->number;
list_add(&table->list, &xt[table->af].tables);
list_add(&table->list, &net->xt.tables[table->af]);
mutex_unlock(&xt[table->af].mutex);
return table;
@ -744,7 +743,7 @@ static struct list_head *type2list(u_int16_t af, u_int16_t type)
list = &xt[af].match;
break;
case TABLE:
list = &xt[af].tables;
list = &init_net.xt.tables[af];
break;
default:
list = NULL;
@ -919,10 +918,22 @@ void xt_proto_fini(int af)
}
EXPORT_SYMBOL_GPL(xt_proto_fini);
static int __net_init xt_net_init(struct net *net)
{
int i;
for (i = 0; i < NPROTO; i++)
INIT_LIST_HEAD(&net->xt.tables[i]);
return 0;
}
static struct pernet_operations xt_net_ops = {
.init = xt_net_init,
};
static int __init xt_init(void)
{
int i;
int i, rv;
xt = kmalloc(sizeof(struct xt_af) * NPROTO, GFP_KERNEL);
if (!xt)
@ -936,13 +947,16 @@ static int __init xt_init(void)
#endif
INIT_LIST_HEAD(&xt[i].target);
INIT_LIST_HEAD(&xt[i].match);
INIT_LIST_HEAD(&xt[i].tables);
}
return 0;
rv = register_pernet_subsys(&xt_net_ops);
if (rv < 0)
kfree(xt);
return rv;
}
static void __exit xt_fini(void)
{
unregister_pernet_subsys(&xt_net_ops);
kfree(xt);
}