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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 <ebiederm@xmission.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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1d9e882ba4
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@ -24,13 +24,19 @@
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <net/sock.h>
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#include <net/net_namespace.h>
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u64 uevent_seqnum;
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char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
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static DEFINE_SPINLOCK(sequence_lock);
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#if defined(CONFIG_NET)
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static struct sock *uevent_sock;
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#ifdef CONFIG_NET
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struct uevent_sock {
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struct list_head list;
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struct sock *sk;
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};
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static LIST_HEAD(uevent_sock_list);
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static DEFINE_MUTEX(uevent_sock_mutex);
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#endif
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/* the strings here must match the enum in include/linux/kobject.h */
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@ -100,6 +106,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
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u64 seq;
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int i = 0;
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int retval = 0;
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#ifdef CONFIG_NET
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struct uevent_sock *ue_sk;
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#endif
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pr_debug("kobject: '%s' (%p): %s\n",
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kobject_name(kobj), kobj, __func__);
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@ -211,7 +220,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
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#if defined(CONFIG_NET)
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/* send netlink message */
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if (uevent_sock) {
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mutex_lock(&uevent_sock_mutex);
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list_for_each_entry(ue_sk, &uevent_sock_list, list) {
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struct sock *uevent_sock = ue_sk->sk;
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struct sk_buff *skb;
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size_t len;
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@ -241,6 +252,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
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} else
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retval = -ENOMEM;
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}
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mutex_unlock(&uevent_sock_mutex);
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#endif
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/* call uevent_helper, usually only enabled during early boot */
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@ -320,18 +332,58 @@ int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
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EXPORT_SYMBOL_GPL(add_uevent_var);
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#if defined(CONFIG_NET)
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static int __init kobject_uevent_init(void)
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static int uevent_net_init(struct net *net)
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{
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uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
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1, NULL, NULL, THIS_MODULE);
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if (!uevent_sock) {
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struct uevent_sock *ue_sk;
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ue_sk = kzalloc(sizeof(*ue_sk), GFP_KERNEL);
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if (!ue_sk)
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return -ENOMEM;
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ue_sk->sk = netlink_kernel_create(net, NETLINK_KOBJECT_UEVENT,
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1, NULL, NULL, THIS_MODULE);
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if (!ue_sk->sk) {
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printk(KERN_ERR
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"kobject_uevent: unable to create netlink socket!\n");
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return -ENODEV;
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}
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netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
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mutex_lock(&uevent_sock_mutex);
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list_add_tail(&ue_sk->list, &uevent_sock_list);
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mutex_unlock(&uevent_sock_mutex);
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return 0;
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}
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static void uevent_net_exit(struct net *net)
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{
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struct uevent_sock *ue_sk;
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mutex_lock(&uevent_sock_mutex);
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list_for_each_entry(ue_sk, &uevent_sock_list, list) {
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if (sock_net(ue_sk->sk) == net)
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goto found;
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}
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mutex_unlock(&uevent_sock_mutex);
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return;
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found:
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list_del(&ue_sk->list);
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mutex_unlock(&uevent_sock_mutex);
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netlink_kernel_release(ue_sk->sk);
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kfree(ue_sk);
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}
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static struct pernet_operations uevent_net_ops = {
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.init = uevent_net_init,
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.exit = uevent_net_exit,
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};
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static int __init kobject_uevent_init(void)
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{
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netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
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return register_pernet_subsys(&uevent_net_ops);
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}
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postcore_initcall(kobject_uevent_init);
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#endif
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