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Diffstat (limited to 'net')
-rw-r--r--net/core/net_namespace.c188
1 files changed, 102 insertions, 86 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index a42caa2b909b..9679ad292da9 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -43,13 +43,40 @@ static void unregister_netdevices(struct net *net, struct list_head *list)
}
}
+static int ops_init(const struct pernet_operations *ops, struct net *net)
+{
+ int err;
+ if (ops->id && ops->size) {
+ void *data = kzalloc(ops->size, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ err = net_assign_generic(net, *ops->id, data);
+ if (err) {
+ kfree(data);
+ return err;
+ }
+ }
+ if (ops->init)
+ return ops->init(net);
+ return 0;
+}
+
+static void ops_free(const struct pernet_operations *ops, struct net *net)
+{
+ if (ops->id && ops->size) {
+ int id = *ops->id;
+ kfree(net_generic(net, id));
+ }
+}
+
/*
* setup_net runs the initializers for the network namespace object.
*/
static __net_init int setup_net(struct net *net)
{
/* Must be called with net_mutex held */
- struct pernet_operations *ops;
+ const struct pernet_operations *ops, *saved_ops;
int error = 0;
atomic_set(&net->count, 1);
@@ -59,11 +86,9 @@ static __net_init int setup_net(struct net *net)
#endif
list_for_each_entry(ops, &pernet_list, list) {
- if (ops->init) {
- error = ops->init(net);
- if (error < 0)
- goto out_undo;
- }
+ error = ops_init(ops, net);
+ if (error < 0)
+ goto out_undo;
}
out:
return error;
@@ -72,6 +97,7 @@ out_undo:
/* Walk through the list backwards calling the exit functions
* for the pernet modules whose init functions did not fail.
*/
+ saved_ops = ops;
list_for_each_entry_continue_reverse(ops, &pernet_list, list) {
if (ops->exit)
ops->exit(net);
@@ -83,6 +109,9 @@ out_undo:
rtnl_unlock();
}
}
+ ops = saved_ops;
+ list_for_each_entry_continue_reverse(ops, &pernet_list, list)
+ ops_free(ops, net);
rcu_barrier();
goto out;
@@ -175,7 +204,7 @@ static LIST_HEAD(cleanup_list); /* Must hold cleanup_list_lock to touch */
static void cleanup_net(struct work_struct *work)
{
- struct pernet_operations *ops;
+ const struct pernet_operations *ops;
struct net *net, *tmp;
LIST_HEAD(net_kill_list);
@@ -214,6 +243,13 @@ static void cleanup_net(struct work_struct *work)
rtnl_unlock();
}
}
+ /* Free the net generic variables */
+ list_for_each_entry_reverse(ops, &pernet_list, list) {
+ if (ops->size && ops->id) {
+ list_for_each_entry(net, &net_kill_list, cleanup_list)
+ ops_free(ops, net);
+ }
+ }
mutex_unlock(&net_mutex);
@@ -309,16 +345,16 @@ static int __init net_ns_init(void)
pure_initcall(net_ns_init);
#ifdef CONFIG_NET_NS
-static int register_pernet_operations(struct list_head *list,
- struct pernet_operations *ops)
+static int __register_pernet_operations(struct list_head *list,
+ struct pernet_operations *ops)
{
struct net *net, *undo_net;
int error;
list_add_tail(&ops->list, list);
- if (ops->init) {
+ if (ops->init || (ops->id && ops->size)) {
for_each_net(net) {
- error = ops->init(net);
+ error = ops_init(ops, net);
if (error)
goto out_undo;
}
@@ -336,10 +372,18 @@ out_undo:
}
}
undone:
+ if (ops->size && ops->id) {
+ for_each_net(undo_net) {
+ if (net_eq(undo_net, net))
+ goto freed;
+ ops_free(ops, undo_net);
+ }
+ }
+freed:
return error;
}
-static void unregister_pernet_operations(struct pernet_operations *ops)
+static void __unregister_pernet_operations(struct pernet_operations *ops)
{
struct net *net;
@@ -347,27 +391,66 @@ static void unregister_pernet_operations(struct pernet_operations *ops)
if (ops->exit)
for_each_net(net)
ops->exit(net);
+ if (ops->id && ops->size)
+ for_each_net(net)
+ ops_free(ops, net);
}
#else
-static int register_pernet_operations(struct list_head *list,
- struct pernet_operations *ops)
+static int __register_pernet_operations(struct list_head *list,
+ struct pernet_operations *ops)
{
- if (ops->init == NULL)
- return 0;
- return ops->init(&init_net);
+ int err = 0;
+ err = ops_init(ops, &init_net);
+ if (err)
+ ops_free(ops, &init_net);
+ return err;
+
}
-static void unregister_pernet_operations(struct pernet_operations *ops)
+static void __unregister_pernet_operations(struct pernet_operations *ops)
{
if (ops->exit)
ops->exit(&init_net);
+ ops_free(ops, &init_net);
}
-#endif
+
+#endif /* CONFIG_NET_NS */
static DEFINE_IDA(net_generic_ids);
+static int register_pernet_operations(struct list_head *list,
+ struct pernet_operations *ops)
+{
+ int error;
+
+ if (ops->id) {
+again:
+ error = ida_get_new_above(&net_generic_ids, 1, ops->id);
+ if (error < 0) {
+ if (error == -EAGAIN) {
+ ida_pre_get(&net_generic_ids, GFP_KERNEL);
+ goto again;
+ }
+ return error;
+ }
+ }
+ error = __register_pernet_operations(list, ops);
+ if (error && ops->id)
+ ida_remove(&net_generic_ids, *ops->id);
+
+ return error;
+}
+
+static void unregister_pernet_operations(struct pernet_operations *ops)
+{
+
+ __unregister_pernet_operations(ops);
+ if (ops->id)
+ ida_remove(&net_generic_ids, *ops->id);
+}
+
/**
* register_pernet_subsys - register a network namespace subsystem
* @ops: pernet operations structure for the subsystem
@@ -414,38 +497,6 @@ void unregister_pernet_subsys(struct pernet_operations *module)
}
EXPORT_SYMBOL_GPL(unregister_pernet_subsys);
-int register_pernet_gen_subsys(int *id, struct pernet_operations *ops)
-{
- int rv;
-
- mutex_lock(&net_mutex);
-again:
- rv = ida_get_new_above(&net_generic_ids, 1, id);
- if (rv < 0) {
- if (rv == -EAGAIN) {
- ida_pre_get(&net_generic_ids, GFP_KERNEL);
- goto again;
- }
- goto out;
- }
- rv = register_pernet_operations(first_device, ops);
- if (rv < 0)
- ida_remove(&net_generic_ids, *id);
-out:
- mutex_unlock(&net_mutex);
- return rv;
-}
-EXPORT_SYMBOL_GPL(register_pernet_gen_subsys);
-
-void unregister_pernet_gen_subsys(int id, struct pernet_operations *ops)
-{
- mutex_lock(&net_mutex);
- unregister_pernet_operations(ops);
- ida_remove(&net_generic_ids, id);
- mutex_unlock(&net_mutex);
-}
-EXPORT_SYMBOL_GPL(unregister_pernet_gen_subsys);
-
/**
* register_pernet_device - register a network namespace device
* @ops: pernet operations structure for the subsystem
@@ -477,30 +528,6 @@ int register_pernet_device(struct pernet_operations *ops)
}
EXPORT_SYMBOL_GPL(register_pernet_device);
-int register_pernet_gen_device(int *id, struct pernet_operations *ops)
-{
- int error;
- mutex_lock(&net_mutex);
-again:
- error = ida_get_new_above(&net_generic_ids, 1, id);
- if (error) {
- if (error == -EAGAIN) {
- ida_pre_get(&net_generic_ids, GFP_KERNEL);
- goto again;
- }
- goto out;
- }
- error = register_pernet_operations(&pernet_list, ops);
- if (error)
- ida_remove(&net_generic_ids, *id);
- else if (first_device == &pernet_list)
- first_device = &ops->list;
-out:
- mutex_unlock(&net_mutex);
- return error;
-}
-EXPORT_SYMBOL_GPL(register_pernet_gen_device);
-
/**
* unregister_pernet_device - unregister a network namespace netdevice
* @ops: pernet operations structure to manipulate
@@ -520,17 +547,6 @@ void unregister_pernet_device(struct pernet_operations *ops)
}
EXPORT_SYMBOL_GPL(unregister_pernet_device);
-void unregister_pernet_gen_device(int id, struct pernet_operations *ops)
-{
- mutex_lock(&net_mutex);
- if (&ops->list == first_device)
- first_device = first_device->next;
- unregister_pernet_operations(ops);
- ida_remove(&net_generic_ids, id);
- mutex_unlock(&net_mutex);
-}
-EXPORT_SYMBOL_GPL(unregister_pernet_gen_device);
-
static void net_generic_release(struct rcu_head *rcu)
{
struct net_generic *ng;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.