97c53cacf0
After this patch none of the netlink callback support anything except the initial network namespace but the rtnetlink infrastructure now handles multiple network namespaces. Changes from v2: - IPv6 addrlabel processing Changes from v1: - no need for special rtnl_unlock handling - fixed IPv6 ndisc Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/*
|
|
* Operations on the network namespace
|
|
*/
|
|
#ifndef __NET_NET_NAMESPACE_H
|
|
#define __NET_NET_NAMESPACE_H
|
|
|
|
#include <asm/atomic.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/list.h>
|
|
|
|
struct proc_dir_entry;
|
|
struct net_device;
|
|
struct sock;
|
|
struct net {
|
|
atomic_t count; /* To decided when the network
|
|
* namespace should be freed.
|
|
*/
|
|
atomic_t use_count; /* To track references we
|
|
* destroy on demand
|
|
*/
|
|
struct list_head list; /* list of network namespaces */
|
|
struct work_struct work; /* work struct for freeing */
|
|
|
|
struct proc_dir_entry *proc_net;
|
|
struct proc_dir_entry *proc_net_stat;
|
|
struct proc_dir_entry *proc_net_root;
|
|
|
|
struct net_device *loopback_dev; /* The loopback */
|
|
|
|
struct list_head dev_base_head;
|
|
struct hlist_head *dev_name_head;
|
|
struct hlist_head *dev_index_head;
|
|
|
|
struct sock *rtnl; /* rtnetlink socket */
|
|
};
|
|
|
|
#ifdef CONFIG_NET
|
|
/* Init's network namespace */
|
|
extern struct net init_net;
|
|
#define INIT_NET_NS(net_ns) .net_ns = &init_net,
|
|
#else
|
|
#define INIT_NET_NS(net_ns)
|
|
#endif
|
|
|
|
extern struct list_head net_namespace_list;
|
|
|
|
#ifdef CONFIG_NET
|
|
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
|
|
#else
|
|
static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
|
|
{
|
|
/* There is nothing to copy so this is a noop */
|
|
return net_ns;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
extern void __put_net(struct net *net);
|
|
|
|
static inline struct net *get_net(struct net *net)
|
|
{
|
|
atomic_inc(&net->count);
|
|
return net;
|
|
}
|
|
|
|
static inline struct net *maybe_get_net(struct net *net)
|
|
{
|
|
/* Used when we know struct net exists but we
|
|
* aren't guaranteed a previous reference count
|
|
* exists. If the reference count is zero this
|
|
* function fails and returns NULL.
|
|
*/
|
|
if (!atomic_inc_not_zero(&net->count))
|
|
net = NULL;
|
|
return net;
|
|
}
|
|
|
|
static inline void put_net(struct net *net)
|
|
{
|
|
if (atomic_dec_and_test(&net->count))
|
|
__put_net(net);
|
|
}
|
|
|
|
static inline struct net *hold_net(struct net *net)
|
|
{
|
|
atomic_inc(&net->use_count);
|
|
return net;
|
|
}
|
|
|
|
static inline void release_net(struct net *net)
|
|
{
|
|
atomic_dec(&net->use_count);
|
|
}
|
|
#else
|
|
static inline struct net *get_net(struct net *net)
|
|
{
|
|
return net;
|
|
}
|
|
|
|
static inline void put_net(struct net *net)
|
|
{
|
|
}
|
|
|
|
static inline struct net *hold_net(struct net *net)
|
|
{
|
|
return net;
|
|
}
|
|
|
|
static inline void release_net(struct net *net)
|
|
{
|
|
}
|
|
|
|
static inline struct net *maybe_get_net(struct net *net)
|
|
{
|
|
return net;
|
|
}
|
|
#endif
|
|
|
|
#define for_each_net(VAR) \
|
|
list_for_each_entry(VAR, &net_namespace_list, list)
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
#define __net_init
|
|
#define __net_exit
|
|
#define __net_initdata
|
|
#else
|
|
#define __net_init __init
|
|
#define __net_exit __exit_refok
|
|
#define __net_initdata __initdata
|
|
#endif
|
|
|
|
struct pernet_operations {
|
|
struct list_head list;
|
|
int (*init)(struct net *net);
|
|
void (*exit)(struct net *net);
|
|
};
|
|
|
|
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 *);
|
|
|
|
#endif /* __NET_NET_NAMESPACE_H */
|