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SubjectRe: [patch -mm] net namespace: empty framework
Cedric,

Dmitry Mishin and Daniel Lezcano are working together on the full
network namespace incorporating both needs of OpenVZ and VServer/IBM.

Thanks,
Kirill

> From: Cedric Le Goater <cedric@legoater.org>
>
> This patch adds an empty net namespace framework
>
> Signed-off-by: Cedric Le Goater <cedric@legoater.org>
> ---
> include/linux/init_task.h | 2 +
> include/linux/net_namespace.h | 49 ++++++++++++++++++++++++++++++++++++++++++
> include/linux/nsproxy.h | 2 +
> kernel/nsproxy.c | 12 ++++++++++
> net/Kconfig | 8 ++++++
> net/core/Makefile | 2 -
> net/core/net_namespace.c | 41 +++++++++++++++++++++++++++++++++++
> 7 files changed, 115 insertions(+), 1 deletion(-)
>
> Index: 2.6.19-rc5-mm2/include/linux/init_task.h
> ===================================================================
> --- 2.6.19-rc5-mm2.orig/include/linux/init_task.h
> +++ 2.6.19-rc5-mm2/include/linux/init_task.h
> @@ -8,6 +8,7 @@
> #include <linux/lockdep.h>
> #include <linux/ipc.h>
> #include <linux/pid_namespace.h>
> +#include <linux/net_namespace.h>
>
> #define INIT_FDTABLE \
> { \
> @@ -78,6 +79,7 @@ extern struct nsproxy init_nsproxy;
> .id = 0, \
> .uts_ns = &init_uts_ns, \
> .mnt_ns = NULL, \
> + INIT_NET_NS(net_ns) \
> INIT_IPC_NS(ipc_ns) \
> }
>
> Index: 2.6.19-rc5-mm2/include/linux/net_namespace.h
> ===================================================================
> --- /dev/null
> +++ 2.6.19-rc5-mm2/include/linux/net_namespace.h
> @@ -0,0 +1,49 @@
> +#ifndef _LINUX_NET_NAMESPACE_H
> +#define _LINUX_NET_NAMESPACE_H
> +
> +#include <linux/kref.h>
> +#include <linux/nsproxy.h>
> +
> +struct net_namespace {
> + struct kref kref;
> +};
> +
> +extern struct net_namespace init_net_ns;
> +
> +#ifdef CONFIG_NET_NS
> +
> +#define INIT_NET_NS(net_ns) .net_ns = &init_net_ns,
> +
> +static inline void get_net_ns(struct net_namespace *ns)
> +{
> + kref_get(&ns->kref);
> +}
> +
> +extern int copy_net_ns(int flags, struct task_struct *tsk);
> +
> +extern void free_net_ns(struct kref *kref);
> +
> +static inline void put_net_ns(struct net_namespace *ns)
> +{
> + kref_put(&ns->kref, free_net_ns);
> +}
> +
> +#else
> +
> +#define INIT_NET_NS(net_ns)
> +
> +static inline void get_net_ns(struct net_namespace *ns)
> +{
> +}
> +
> +static inline int copy_net_ns(int flags, struct task_struct *tsk)
> +{
> + return 0;
> +}
> +
> +static inline void put_net_ns(struct net_namespace *ns)
> +{
> +}
> +#endif
> +
> +#endif /* _LINUX_NET_NAMESPACE_H */
> Index: 2.6.19-rc5-mm2/include/linux/nsproxy.h
> ===================================================================
> --- 2.6.19-rc5-mm2.orig/include/linux/nsproxy.h
> +++ 2.6.19-rc5-mm2/include/linux/nsproxy.h
> @@ -10,6 +10,7 @@ struct mnt_namespace;
> struct uts_namespace;
> struct ipc_namespace;
> struct pid_namespace;
> +struct net_namespace;
>
> /*
> * namespaces flags
> @@ -42,6 +43,7 @@ struct nsproxy {
> struct ipc_namespace *ipc_ns;
> struct mnt_namespace *mnt_ns;
> struct pid_namespace *pid_ns;
> + struct net_namespace *net_ns;
>
> struct hlist_node ns_hash_node;
> };
> Index: 2.6.19-rc5-mm2/kernel/nsproxy.c
> ===================================================================
> --- 2.6.19-rc5-mm2.orig/kernel/nsproxy.c
> +++ 2.6.19-rc5-mm2/kernel/nsproxy.c
> @@ -20,6 +20,7 @@
> #include <linux/mnt_namespace.h>
> #include <linux/utsname.h>
> #include <linux/pid_namespace.h>
> +#include <linux/net_namespace.h>
>
> #define NS_HASH_BITS 3 /* this might need some configuration */
> #define NS_HASH_SIZE (1 << NS_HASH_BITS)
> @@ -89,6 +90,8 @@ struct nsproxy *dup_namespaces(struct ns
> get_ipc_ns(ns->ipc_ns);
> if (ns->pid_ns)
> get_pid_ns(ns->pid_ns);
> + if (ns->net_ns)
> + get_net_ns(ns->net_ns);
> }
>
> return ns;
> @@ -136,10 +139,17 @@ int copy_namespaces(int flags, struct ta
> if (err)
> goto out_pid;
>
> + err = copy_net_ns(flags, tsk);
> + if (err)
> + goto out_net;
> +
> out:
> put_nsproxy(old_ns);
> return err;
>
> +out_net:
> + if (new_ns->pid_ns)
> + put_pid_ns(new_ns->pid_ns);
> out_pid:
> if (new_ns->ipc_ns)
> put_ipc_ns(new_ns->ipc_ns);
> @@ -165,6 +175,8 @@ static void free_nsproxy(struct nsproxy
> put_ipc_ns(ns->ipc_ns);
> if (ns->pid_ns)
> put_pid_ns(ns->pid_ns);
> + if (ns->net_ns)
> + put_net_ns(ns->net_ns);
> kfree(ns);
> }
>
> Index: 2.6.19-rc5-mm2/net/core/Makefile
> ===================================================================
> --- 2.6.19-rc5-mm2.orig/net/core/Makefile
> +++ 2.6.19-rc5-mm2/net/core/Makefile
> @@ -3,7 +3,7 @@
> #
>
> obj-y := sock.o request_sock.o skbuff.o iovec.o datagram.o stream.o scm.o \
> - gen_stats.o gen_estimator.o
> + gen_stats.o gen_estimator.o net_namespace.o
>
> obj-$(CONFIG_SYSCTL) += sysctl_net_core.o
>
> Index: 2.6.19-rc5-mm2/net/core/net_namespace.c
> ===================================================================
> --- /dev/null
> +++ 2.6.19-rc5-mm2/net/core/net_namespace.c
> @@ -0,0 +1,41 @@
> +/*
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation, version 2 of the
> + * License.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/version.h>
> +#include <linux/nsproxy.h>
> +#include <linux/net_namespace.h>
> +
> +struct net_namespace init_net_ns = {
> + .kref = {
> + .refcount = ATOMIC_INIT(2),
> + },
> +};
> +
> +#ifdef CONFIG_NET_NS
> +
> +int copy_net_ns(int flags, struct task_struct *tsk)
> +{
> + struct net_namespace *old_ns = tsk->nsproxy->net_ns;
> + int err = 0;
> +
> + if (!old_ns)
> + return 0;
> +
> + get_net_ns(old_ns);
> + return err;
> +}
> +
> +void free_net_ns(struct kref *kref)
> +{
> + struct net_namespace *ns;
> +
> + ns = container_of(kref, struct net_namespace, kref);
> + kfree(ns);
> +}
> +
> +#endif /* CONFIG_NET_NS */
> Index: 2.6.19-rc5-mm2/net/Kconfig
> ===================================================================
> --- 2.6.19-rc5-mm2.orig/net/Kconfig
> +++ 2.6.19-rc5-mm2/net/Kconfig
> @@ -67,6 +67,14 @@ source "net/netlabel/Kconfig"
>
> endif # if INET
>
> +config NET_NS
> + bool "Network Namespaces"
> + help
> + This option enables multiple independent network namespaces,
> + each having own network devices, IP addresses, routes, and so on.
> + If unsure, answer N.
> +
> +
> config NETWORK_SECMARK
> bool "Security Marking"
> help
>

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