From 07e98962fa778b9782c8845dfcb06a84cc050744 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 4 May 2010 17:36:44 -0700 Subject: kobject: Send hotplug events in all network namespaces Open a copy of the uevent kernel socket in each network namespace so we can send uevents in all network namespaces. Signed-off-by: Eric W. Biederman Acked-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- lib/kobject_uevent.c | 68 +++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 60 insertions(+), 8 deletions(-) (limited to 'lib') diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c index 7b48d44ced6e..9084f2550c2a 100644 --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -24,13 +24,19 @@ #include #include #include +#include u64 uevent_seqnum; char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH; static DEFINE_SPINLOCK(sequence_lock); -#if defined(CONFIG_NET) -static struct sock *uevent_sock; +#ifdef CONFIG_NET +struct uevent_sock { + struct list_head list; + struct sock *sk; +}; +static LIST_HEAD(uevent_sock_list); +static DEFINE_MUTEX(uevent_sock_mutex); #endif /* the strings here must match the enum in include/linux/kobject.h */ @@ -100,6 +106,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, u64 seq; int i = 0; int retval = 0; +#ifdef CONFIG_NET + struct uevent_sock *ue_sk; +#endif pr_debug("kobject: '%s' (%p): %s\n", kobject_name(kobj), kobj, __func__); @@ -211,7 +220,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, #if defined(CONFIG_NET) /* send netlink message */ - if (uevent_sock) { + mutex_lock(&uevent_sock_mutex); + list_for_each_entry(ue_sk, &uevent_sock_list, list) { + struct sock *uevent_sock = ue_sk->sk; struct sk_buff *skb; size_t len; @@ -241,6 +252,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, } else retval = -ENOMEM; } + mutex_unlock(&uevent_sock_mutex); #endif /* call uevent_helper, usually only enabled during early boot */ @@ -320,18 +332,58 @@ int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...) EXPORT_SYMBOL_GPL(add_uevent_var); #if defined(CONFIG_NET) -static int __init kobject_uevent_init(void) +static int uevent_net_init(struct net *net) { - uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT, - 1, NULL, NULL, THIS_MODULE); - if (!uevent_sock) { + struct uevent_sock *ue_sk; + + ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL); + if (!ue_sk) + return -ENOMEM; + + ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT, + 1, NULL, NULL, THIS_MODULE); + if (!ue_sk->sk) { printk(KERN_ERR "kobject_uevent: unable to create netlink socket!\n"); return -ENODEV; } - netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV); + mutex_lock(&uevent_sock_mutex); + list_add_tail(&ue_sk->list, &uevent_sock_list); + mutex_unlock(&uevent_sock_mutex); return 0; } +static void uevent_net_exit(struct net *net) +{ + struct uevent_sock *ue_sk; + + mutex_lock(&uevent_sock_mutex); + list_for_each_entry(ue_sk, &uevent_sock_list, list) { + if (sock_net(ue_sk->sk) == net) + goto found; + } + mutex_unlock(&uevent_sock_mutex); + return; + +found: + list_del(&ue_sk->list); + mutex_unlock(&uevent_sock_mutex); + + netlink_kernel_release(ue_sk->sk); + kfree(ue_sk); +} + +static struct pernet_operations uevent_net_ops = { + .init = uevent_net_init, + .exit = uevent_net_exit, +}; + +static int __init kobject_uevent_init(void) +{ + netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV); + return register_pernet_subsys(&uevent_net_ops); +} + + postcore_initcall(kobject_uevent_init); #endif -- cgit v1.2.3-58-ga151