[PATCH RFC 6/8] netns: introduce netns_get_inum()

This allows other parts of the kernel to have access to userspace visible namespace identification. Signed-off-by: Aristeu Rozanski <arozansk(a)redhat.com&gt; --- include/net/net_namespace.h | 1 + net/core/net_namespace.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index de644bc..bb24cf4 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -134,6 +134,7 @@ extern struct net init_net; #ifdef CONFIG_NET_NS extern struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, struct net *old_net); +extern unsigned int netns_get_inum(struct task_struct *tsk); #else /* CONFIG_NET_NS */ #include <linux/sched.h> diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index 80e271d..76c89e5 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -664,6 +664,20 @@ static unsigned int netns_inum(void *ns) return net->proc_inum; } +unsigned int netns_get_inum(struct task_struct *tsk) +{ + struct nsproxy *nsproxy; + unsigned int rc = 0; + + rcu_read_lock(); + nsproxy = task_nsproxy(tsk); + if (nsproxy) + rc = netns_inum(nsproxy->net_ns); + rcu_read_unlock(); + + return rc; +} + const struct proc_ns_operations netns_operations = { .name = "net", .type = CLONE_NEWNET, -- 1.7.1