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net: Allow setting the network namespace by fd 

Take advantage of the new abstraction and allow network devices
to be placed in any network namespace that we have a fd to talk
about.

Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2011-05-04 17:51:50 -07:00
parent a00eaf11a2
commit f063052947
4 changed files with 37 additions and 3 deletions
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1
include/linux/if_link.h
View File

@ -136,6 +136,7 @@ enum {
IFLA_PORT_SELF,
IFLA_AF_SPEC,
IFLA_GROUP, /* Group the device belongs to */
IFLA_NET_NS_FD,
__IFLA_MAX
};

1
include/net/net_namespace.h
View File

@ -119,6 +119,7 @@ static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
extern struct list_head net_namespace_list;
extern struct net *get_net_ns_by_pid(pid_t pid);
extern struct net *get_net_ns_by_fd(int pid);
#ifdef CONFIG_NET_NS
extern void __put_net(struct net *net);

33
net/core/net_namespace.c
View File

@ -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;
}

5
net/core/rtnetlink.c
View File

@ -1043,6 +1043,7 @@ const struct nla_policy ifla_policy[IFLA_MAX+1] = {
[IFLA_LINKMODE] = { .type = NLA_U8 },
[IFLA_LINKINFO] = { .type = NLA_NESTED },
[IFLA_NET_NS_PID] = { .type = NLA_U32 },
[IFLA_NET_NS_FD] = { .type = NLA_U32 },
[IFLA_IFALIAS] = { .type = NLA_STRING, .len = IFALIASZ-1 },
[IFLA_VFINFO_LIST] = {. type = NLA_NESTED },
[IFLA_VF_PORTS] = { .type = NLA_NESTED },
@ -1091,6 +1092,8 @@ struct net *rtnl_link_get_net(struct net *src_net, struct nlattr *tb[])
*/
if (tb[IFLA_NET_NS_PID])
net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
else if (tb[IFLA_NET_NS_FD])
net = get_net_ns_by_fd(nla_get_u32(tb[IFLA_NET_NS_FD]));
else
net = get_net(src_net);
return net;
@ -1221,7 +1224,7 @@ static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
int send_addr_notify = 0;
int err;
if (tb[IFLA_NET_NS_PID]) {
if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD]) {
struct net *net = rtnl_link_get_net(dev_net(dev), tb);
if (IS_ERR(net)) {
err = PTR_ERR(net);