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netfilter: netns ebtables: part 2

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* return ebt_table from ebt_register_table(), module code will save it into
  per-netns data for unregistration
* duplicate ebt_table at the very beginning of registration -- it's added into
  list, so one ebt_table wouldn't end up in many lists (and each netns has
  different one)
* introduce underscored tables in individial modules, this is temporary to not
  break bisection.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Alexey Dobriyan 2008-11-04 14:27:15 +01:00 committed by Patrick McHardy
parent 511061e2dd
commit 6beceee5aa
5 changed files with 47 additions and 34 deletions
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3
include/linux/netfilter_bridge/ebtables.h
View File

@ -300,7 +300,8 @@ struct ebt_table
#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_replace)-1)) & \
~(__alignof__(struct ebt_replace)-1))
extern int ebt_register_table(struct net *net, struct ebt_table *table);
extern struct ebt_table *ebt_register_table(struct net *net,
struct ebt_table *table);
extern void ebt_unregister_table(struct ebt_table *table);
extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,

19
net/bridge/netfilter/ebtable_broute.c
View File

@ -41,22 +41,23 @@ static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
return 0;
}
static struct ebt_table broute_table =
static struct ebt_table __broute_table =
{
.name = "broute",
.table = &initial_table,
.valid_hooks = 1 << NF_BR_BROUTING,
.lock = __RW_LOCK_UNLOCKED(broute_table.lock),
.lock = __RW_LOCK_UNLOCKED(__broute_table.lock),
.check = check,
.me = THIS_MODULE,
};
static struct ebt_table *broute_table;
static int ebt_broute(struct sk_buff *skb)
{
int ret;
ret = ebt_do_table(NF_BR_BROUTING, skb, skb->dev, NULL,
&broute_table);
broute_table);
if (ret == NF_DROP)
return 1; /* route it */
return 0; /* bridge it */
@ -64,21 +65,19 @@ static int ebt_broute(struct sk_buff *skb)
static int __init ebtable_broute_init(void)
{
int ret;
ret = ebt_register_table(&init_net, &broute_table);
if (ret < 0)
return ret;
broute_table = ebt_register_table(&init_net, &__broute_table);
if (IS_ERR(broute_table))
return PTR_ERR(broute_table);
/* see br_input.c */
rcu_assign_pointer(br_should_route_hook, ebt_broute);
return ret;
return 0;
}
static void __exit ebtable_broute_fini(void)
{
rcu_assign_pointer(br_should_route_hook, NULL);
synchronize_net();
ebt_unregister_table(&broute_table);
ebt_unregister_table(broute_table);
}
module_init(ebtable_broute_init);

17
net/bridge/netfilter/ebtable_filter.c
View File

@ -50,21 +50,22 @@ static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
return 0;
}
static struct ebt_table frame_filter =
static struct ebt_table __frame_filter =
{
.name = "filter",
.table = &initial_table,
.valid_hooks = FILTER_VALID_HOOKS,
.lock = __RW_LOCK_UNLOCKED(frame_filter.lock),
.lock = __RW_LOCK_UNLOCKED(__frame_filter.lock),
.check = check,
.me = THIS_MODULE,
};
static struct ebt_table *frame_filter;
static unsigned int
ebt_hook(unsigned int hook, struct sk_buff *skb, const struct net_device *in,
const struct net_device *out, int (*okfn)(struct sk_buff *))
{
return ebt_do_table(hook, skb, in, out, &frame_filter);
return ebt_do_table(hook, skb, in, out, frame_filter);
}
static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
@ -95,19 +96,19 @@ static int __init ebtable_filter_init(void)
{
int ret;
ret = ebt_register_table(&init_net, &frame_filter);
if (ret < 0)
return ret;
frame_filter = ebt_register_table(&init_net, &__frame_filter);
if (IS_ERR(frame_filter))
return PTR_ERR(frame_filter);
ret = nf_register_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
if (ret < 0)
ebt_unregister_table(&frame_filter);
ebt_unregister_table(frame_filter);
return ret;
}
static void __exit ebtable_filter_fini(void)
{
nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
ebt_unregister_table(&frame_filter);
ebt_unregister_table(frame_filter);
}
module_init(ebtable_filter_init);

19
net/bridge/netfilter/ebtable_nat.c
View File

@ -50,28 +50,29 @@ static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
return 0;
}
static struct ebt_table frame_nat =
static struct ebt_table __frame_nat =
{
.name = "nat",
.table = &initial_table,
.valid_hooks = NAT_VALID_HOOKS,
.lock = __RW_LOCK_UNLOCKED(frame_nat.lock),
.lock = __RW_LOCK_UNLOCKED(__frame_nat.lock),
.check = check,
.me = THIS_MODULE,
};
static struct ebt_table *frame_nat;
static unsigned int
ebt_nat_dst(unsigned int hook, struct sk_buff *skb, const struct net_device *in
, const struct net_device *out, int (*okfn)(struct sk_buff *))
{
return ebt_do_table(hook, skb, in, out, &frame_nat);
return ebt_do_table(hook, skb, in, out, frame_nat);
}
static unsigned int
ebt_nat_src(unsigned int hook, struct sk_buff *skb, const struct net_device *in
, const struct net_device *out, int (*okfn)(struct sk_buff *))
{
return ebt_do_table(hook, skb, in, out, &frame_nat);
return ebt_do_table(hook, skb, in, out, frame_nat);
}
static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
@ -102,19 +103,19 @@ static int __init ebtable_nat_init(void)
{
int ret;
ret = ebt_register_table(&init_net, &frame_nat);
if (ret < 0)
return ret;
frame_nat = ebt_register_table(&init_net, &__frame_nat);
if (IS_ERR(frame_nat))
return PTR_ERR(frame_nat);
ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
if (ret < 0)
ebt_unregister_table(&frame_nat);
ebt_unregister_table(frame_nat);
return ret;
}
static void __exit ebtable_nat_fini(void)
{
nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
ebt_unregister_table(&frame_nat);
ebt_unregister_table(frame_nat);
}
module_init(ebtable_nat_init);

23
net/bridge/netfilter/ebtables.c
View File

@ -1098,7 +1098,7 @@ free_newinfo:
return ret;
}
int ebt_register_table(struct net *net, struct ebt_table *table)
struct ebt_table *ebt_register_table(struct net *net, struct ebt_table *table)
{
struct ebt_table_info *newinfo;
struct ebt_table *t;
@ -1110,14 +1110,21 @@ int ebt_register_table(struct net *net, struct ebt_table *table)
repl->entries_size == 0 ||
repl->counters || table->private) {
BUGPRINT("Bad table data for ebt_register_table!!!\n");
return -EINVAL;
return ERR_PTR(-EINVAL);
}
/* Don't add one table to multiple lists. */
table = kmemdup(table, sizeof(struct ebt_table), GFP_KERNEL);
if (!table) {
ret = -ENOMEM;
goto out;
}
countersize = COUNTER_OFFSET(repl->nentries) * nr_cpu_ids;
newinfo = vmalloc(sizeof(*newinfo) + countersize);
ret = -ENOMEM;
if (!newinfo)
return -ENOMEM;
goto free_table;
p = vmalloc(repl->entries_size);
if (!p)
@ -1149,7 +1156,7 @@ int ebt_register_table(struct net *net, struct ebt_table *table)
if (table->check && table->check(newinfo, table->valid_hooks)) {
BUGPRINT("The table doesn't like its own initial data, lol\n");
return -EINVAL;
return ERR_PTR(-EINVAL);
}
table->private = newinfo;
@ -1173,7 +1180,7 @@ int ebt_register_table(struct net *net, struct ebt_table *table)
}
list_add(&table->list, &net->xt.tables[NFPROTO_BRIDGE]);
mutex_unlock(&ebt_mutex);
return 0;
return table;
free_unlock:
mutex_unlock(&ebt_mutex);
free_chainstack:
@ -1185,7 +1192,10 @@ free_chainstack:
vfree(newinfo->entries);
free_newinfo:
vfree(newinfo);
return ret;
free_table:
kfree(table);
out:
return ERR_PTR(ret);
}
void ebt_unregister_table(struct ebt_table *table)
@ -1206,6 +1216,7 @@ void ebt_unregister_table(struct ebt_table *table)
vfree(table->private->chainstack);
}
vfree(table->private);
kfree(table);
}
/* userspace just supplied us with counters */