diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-09-26 22:04:26 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:52:46 -0700 |
| commit | 9dd776b6d7b0b85966b6ddd03e2b2aae59012ab1 (patch) | |
| tree | ed92aee1f242bb31a0965a4156063eac916ae15e /include | |
| parent | 8b41d1887db718be9a2cd9e18c58ce25a4c7fd93 (diff) | |
[NET]: Add network namespace clone & unshare support.
This patch allows you to create a new network namespace
using sys_clone, or sys_unshare.
As the network namespace is still experimental and under development
clone and unshare support is only made available when CONFIG_NET_NS is
selected at compile time.
As this patch introduces network namespace support into code paths
that exist when the CONFIG_NET is not selected there are a few
additions made to net_namespace.h to allow a few more functions
to be used when the networking stack is not compiled in.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 1 | ||||
| -rw-r--r-- | include/net/net_namespace.h | 18 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 313c6b6e774..a4a141055c4 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -27,6 +27,7 @@ #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ #define CLONE_NEWIPC 0x08000000 /* New ipcs */ #define CLONE_NEWUSER 0x10000000 /* New user namespace */ +#define CLONE_NEWNET 0x20000000 /* New network namespace */ /* * Scheduling policies diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index ac8f8304094..3ea4194613e 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -38,11 +38,23 @@ extern struct net init_net; 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 + extern void __put_net(struct net *net); static inline struct net *get_net(struct net *net) { +#ifdef CONFIG_NET atomic_inc(&net->count); +#endif return net; } @@ -60,19 +72,25 @@ static inline struct net *maybe_get_net(struct net *net) static inline void put_net(struct net *net) { +#ifdef CONFIG_NET if (atomic_dec_and_test(&net->count)) __put_net(net); +#endif } static inline struct net *hold_net(struct net *net) { +#ifdef CONFIG_NET atomic_inc(&net->use_count); +#endif return net; } static inline void release_net(struct net *net) { +#ifdef CONFIG_NET atomic_dec(&net->use_count); +#endif } extern void net_lock(void); |