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-rw-r--r--include/net/net_namespace.h2
-rw-r--r--net/core/net_namespace.c38
2 files changed, 40 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index e2aee26..72fad1a 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -185,6 +185,8 @@ extern int register_pernet_subsys(struct pernet_operations *);
extern void unregister_pernet_subsys(struct pernet_operations *);
extern int register_pernet_device(struct pernet_operations *);
extern void unregister_pernet_device(struct pernet_operations *);
+extern int register_pernet_gen_device(int *id, struct pernet_operations *);
+extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
struct ctl_path;
struct ctl_table;
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 7b66083..2197d51 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -5,6 +5,7 @@
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/sched.h>
+#include <linux/idr.h>
#include <net/net_namespace.h>
/*
@@ -253,6 +254,8 @@ static void unregister_pernet_operations(struct pernet_operations *ops)
}
#endif
+static DEFINE_IDA(net_generic_ids);
+
/**
* register_pernet_subsys - register a network namespace subsystem
* @ops: pernet operations structure for the subsystem
@@ -330,6 +333,30 @@ 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
@@ -348,3 +375,14 @@ void unregister_pernet_device(struct pernet_operations *ops)
mutex_unlock(&net_mutex);
}
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);