diff options
Diffstat (limited to 'net/core/net_namespace.c')
-rw-r--r-- | net/core/net_namespace.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index bf7707e09a8..b7403ff4d6c 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -8,6 +8,8 @@ #include <linux/idr.h> #include <linux/rculist.h> #include <linux/nsproxy.h> +#include <linux/proc_fs.h> +#include <linux/file.h> #include <net/net_namespace.h> #include <net/netns/generic.h> @@ -343,6 +345,28 @@ struct net *get_net_ns_by_pid(pid_t pid) } EXPORT_SYMBOL_GPL(get_net_ns_by_pid); +struct net *get_net_ns_by_fd(int fd) +{ + struct proc_inode *ei; + struct file *file; + struct net *net; + + net = ERR_PTR(-EINVAL); + file = proc_ns_fget(fd); + if (!file) + goto out; + + ei = PROC_I(file->f_dentry->d_inode); + if (ei->ns_ops != &netns_operations) + goto out; + + net = get_net(ei->ns); +out: + if (file) + fput(file); + return net; +} + static int __init net_ns_init(void) { struct net_generic *ng; @@ -577,10 +601,15 @@ EXPORT_SYMBOL_GPL(unregister_pernet_device); #ifdef CONFIG_NET_NS static void *netns_get(struct task_struct *task) { - struct net *net; + struct net *net = NULL; + struct nsproxy *nsproxy; + rcu_read_lock(); - net = get_net(task->nsproxy->net_ns); + nsproxy = task_nsproxy(task); + if (nsproxy) + net = get_net(nsproxy->net_ns); rcu_read_unlock(); + return net; } |