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netns: Deduplicate and fix copy_net_ns when !CONFIG_NET_NS 

The copy of copy_net_ns used when the network stack is not
built is broken as it does not return -EINVAL when attempting
to create a new network namespace.  We don't even have
a previous network namespace.

Since we need a copy of copy_net_ns in net/net_namespace.h that is
available when the networking stack is not built at all move the
correct version of copy_net_ns from net_namespace.c into net_namespace.h
Leaving us with just 2 versions of copy_net_ns.  One version for when
we compile in network namespace suport and another stub for all other
occasions.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-06-14 02:16:42 -07:00
parent 499dcf2024
commit d727abcb23
2 changed files with 9 additions and 13 deletions
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15
include/net/net_namespace.h
View File

@ -126,16 +126,19 @@ struct net {
/* Init's network namespace */
extern struct net init_net;
#ifdef CONFIG_NET
#ifdef CONFIG_NET_NS
extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
#else /* CONFIG_NET */
static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
#else /* CONFIG_NET_NS */
#include <linux/sched.h>
#include <linux/nsproxy.h>
static inline struct net *copy_net_ns(unsigned long flags, struct net *old_net)
{
/* There is nothing to copy so this is a noop */
return net_ns;
if (flags & CLONE_NEWNET)
return ERR_PTR(-EINVAL);
return old_net;
}
#endif /* CONFIG_NET */
#endif /* CONFIG_NET_NS */
extern struct list_head net_namespace_list;

7
net/core/net_namespace.c
View File

@ -347,13 +347,6 @@ struct net *get_net_ns_by_fd(int fd)
}
#else
struct net *copy_net_ns(unsigned long flags, struct net *old_net)
{
if (flags & CLONE_NEWNET)
return ERR_PTR(-EINVAL);
return old_net;
}
struct net *get_net_ns_by_fd(int fd)
{
return ERR_PTR(-EINVAL);