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>
---
include/linux/netfilter/x_tables.h | 6 ++++--
include/net/net_namespace.h | 4 ++++
include/net/netns/x_tables.h | 10 ++++++++++
net/ipv4/netfilter/arp_tables.c | 12 ++++++------
net/ipv4/netfilter/ip_tables.c | 12 ++++++------
net/ipv6/netfilter/ip6_tables.c | 12 ++++++------
net/netfilter/x_tables.c | 35 ++++++++++++++++++++++++-----------
7 files changed, 60 insertions(+), 31 deletions(-)
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -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);
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -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
--- /dev/null
+++ b/include/net/netns/x_tables.h
@@ -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
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -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);
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -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);
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -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);
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -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(x
...