diff options
| -rw-r--r-- | include/net/net_namespace.h | 2 | ||||
| -rw-r--r-- | net/core/net_namespace.c | 38 |
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); |