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path: root/net/ipv4/netfilter/ip_tables.c
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Diffstat (limited to 'net/ipv4/netfilter/ip_tables.c')
-rw-r--r--net/ipv4/netfilter/ip_tables.c86
1 files changed, 51 insertions, 35 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index f77ea0dbe656..13acb687c19a 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -868,7 +868,7 @@ copy_entries_to_user(unsigned int total_size,
return ret;
}
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
static void compat_standard_from_user(void *dst, const void *src)
{
int v = *(compat_int_t *)src;
@@ -957,7 +957,7 @@ static int get_info(struct net *net, void __user *user, const int *len)
return -EFAULT;
name[XT_TABLE_MAXNAMELEN-1] = '\0';
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
if (in_compat_syscall())
xt_compat_lock(AF_INET);
#endif
@@ -965,7 +965,7 @@ static int get_info(struct net *net, void __user *user, const int *len)
if (!IS_ERR(t)) {
struct ipt_getinfo info;
const struct xt_table_info *private = t->private;
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
struct xt_table_info tmp;
if (in_compat_syscall()) {
@@ -993,7 +993,7 @@ static int get_info(struct net *net, void __user *user, const int *len)
module_put(t->me);
} else
ret = PTR_ERR(t);
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
if (in_compat_syscall())
xt_compat_unlock(AF_INET);
#endif
@@ -1199,7 +1199,7 @@ do_add_counters(struct net *net, sockptr_t arg, unsigned int len)
return ret;
}
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
struct compat_ipt_replace {
char name[XT_TABLE_MAXNAMELEN];
u32 valid_hooks;
@@ -1621,7 +1621,7 @@ do_ipt_set_ctl(struct sock *sk, int cmd, sockptr_t arg, unsigned int len)
switch (cmd) {
case IPT_SO_SET_REPLACE:
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
if (in_compat_syscall())
ret = compat_do_replace(sock_net(sk), arg, len);
else
@@ -1654,7 +1654,7 @@ do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
break;
case IPT_SO_GET_ENTRIES:
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
if (in_compat_syscall())
ret = compat_get_entries(sock_net(sk), user, len);
else
@@ -1716,9 +1716,11 @@ static void __ipt_unregister_table(struct net *net, struct xt_table *table)
int ipt_register_table(struct net *net, const struct xt_table *table,
const struct ipt_replace *repl,
- const struct nf_hook_ops *ops, struct xt_table **res)
+ const struct nf_hook_ops *template_ops)
{
- int ret;
+ struct nf_hook_ops *ops;
+ unsigned int num_ops;
+ int ret, i;
struct xt_table_info *newinfo;
struct xt_table_info bootstrap = {0};
void *loc_cpu_entry;
@@ -1732,50 +1734,65 @@ int ipt_register_table(struct net *net, const struct xt_table *table,
memcpy(loc_cpu_entry, repl->entries, repl->size);
ret = translate_table(net, newinfo, loc_cpu_entry, repl);
- if (ret != 0)
- goto out_free;
+ if (ret != 0) {
+ xt_free_table_info(newinfo);
+ return ret;
+ }
new_table = xt_register_table(net, table, &bootstrap, newinfo);
if (IS_ERR(new_table)) {
- ret = PTR_ERR(new_table);
- goto out_free;
+ xt_free_table_info(newinfo);
+ return PTR_ERR(new_table);
}
- /* set res now, will see skbs right after nf_register_net_hooks */
- WRITE_ONCE(*res, new_table);
- if (!ops)
+ /* No template? No need to do anything. This is used by 'nat' table, it registers
+ * with the nat core instead of the netfilter core.
+ */
+ if (!template_ops)
return 0;
- ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks));
- if (ret != 0) {
- __ipt_unregister_table(net, new_table);
- *res = NULL;
+ num_ops = hweight32(table->valid_hooks);
+ if (num_ops == 0) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL);
+ if (!ops) {
+ ret = -ENOMEM;
+ goto out_free;
}
+ for (i = 0; i < num_ops; i++)
+ ops[i].priv = new_table;
+
+ new_table->ops = ops;
+
+ ret = nf_register_net_hooks(net, ops, num_ops);
+ if (ret != 0)
+ goto out_free;
+
return ret;
out_free:
- xt_free_table_info(newinfo);
+ __ipt_unregister_table(net, new_table);
return ret;
}
-void ipt_unregister_table_pre_exit(struct net *net, struct xt_table *table,
- const struct nf_hook_ops *ops)
+void ipt_unregister_table_pre_exit(struct net *net, const char *name)
{
- nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks));
-}
+ struct xt_table *table = xt_find_table(net, NFPROTO_IPV4, name);
-void ipt_unregister_table_exit(struct net *net, struct xt_table *table)
-{
- __ipt_unregister_table(net, table);
+ if (table)
+ nf_unregister_net_hooks(net, table->ops, hweight32(table->valid_hooks));
}
-void ipt_unregister_table(struct net *net, struct xt_table *table,
- const struct nf_hook_ops *ops)
+void ipt_unregister_table_exit(struct net *net, const char *name)
{
- if (ops)
- ipt_unregister_table_pre_exit(net, table, ops);
- __ipt_unregister_table(net, table);
+ struct xt_table *table = xt_find_table(net, NFPROTO_IPV4, name);
+
+ if (table)
+ __ipt_unregister_table(net, table);
}
/* Returns 1 if the type and code is matched by the range, 0 otherwise */
@@ -1829,7 +1846,7 @@ static struct xt_target ipt_builtin_tg[] __read_mostly = {
.name = XT_STANDARD_TARGET,
.targetsize = sizeof(int),
.family = NFPROTO_IPV4,
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_NETFILTER_XTABLES_COMPAT
.compatsize = sizeof(compat_int_t),
.compat_from_user = compat_standard_from_user,
.compat_to_user = compat_standard_to_user,
@@ -1924,7 +1941,6 @@ static void __exit ip_tables_fini(void)
}
EXPORT_SYMBOL(ipt_register_table);
-EXPORT_SYMBOL(ipt_unregister_table);
EXPORT_SYMBOL(ipt_unregister_table_pre_exit);
EXPORT_SYMBOL(ipt_unregister_table_exit);
EXPORT_SYMBOL(ipt_do_table);
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-16 23:11:31 +0000