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uevent: add alloc_uevent_skb() helper 

This patch adds alloc_uevent_skb() in preparation for follow up patches.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christian Brauner 2018-04-29 12:44:11 +02:00 committed by David S. Miller
parent e33200bc01
commit 26045a7b14
1 changed files with 34 additions and 13 deletions
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47
lib/kobject_uevent.c
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@ -22,6 +22,7 @@
#include <linux/socket.h> #include <linux/socket.h>
#include <linux/skbuff.h> #include <linux/skbuff.h>
#include <linux/netlink.h> #include <linux/netlink.h>
#include <linux/uidgid.h>
#include <linux/uuid.h> #include <linux/uuid.h>
#include <linux/ctype.h> #include <linux/ctype.h>
#include <net/sock.h> #include <net/sock.h>
@ -296,6 +297,38 @@ static void cleanup_uevent_env(struct subprocess_info *info)
} }
#endif #endif
#ifdef CONFIG_NET
static struct sk_buff *alloc_uevent_skb(struct kobj_uevent_env *env,
const char *action_string,
const char *devpath)
{
struct netlink_skb_parms *parms;
struct sk_buff *skb = NULL;
char *scratch;
size_t len;
/* allocate message with maximum possible size */
len = strlen(action_string) + strlen(devpath) + 2;
skb = alloc_skb(len + env->buflen, GFP_KERNEL);
if (!skb)
return NULL;
/* add header */
scratch = skb_put(skb, len);
sprintf(scratch, "%s@%s", action_string, devpath);
skb_put_data(skb, env->buf, env->buflen);
parms = &NETLINK_CB(skb);
parms->creds.uid = GLOBAL_ROOT_UID;
parms->creds.gid = GLOBAL_ROOT_GID;
parms->dst_group = 1;
parms->portid = 0;
return skb;
}
#endif
static int kobject_uevent_net_broadcast(struct kobject *kobj, static int kobject_uevent_net_broadcast(struct kobject *kobj,
struct kobj_uevent_env *env, struct kobj_uevent_env *env,
const char *action_string, const char *action_string,
@ -314,22 +347,10 @@ static int kobject_uevent_net_broadcast(struct kobject *kobj,
continue; continue;
if (!skb) { if (!skb) {
/* allocate message with the maximum possible size */
size_t len = strlen(action_string) + strlen(devpath) + 2;
char *scratch;
retval = -ENOMEM; retval = -ENOMEM;
skb = alloc_skb(len + env->buflen, GFP_KERNEL); skb = alloc_uevent_skb(env, action_string, devpath);
if (!skb) if (!skb)
continue; continue;
/* add header */
scratch = skb_put(skb, len);
sprintf(scratch, "%s@%s", action_string, devpath);
skb_put_data(skb, env->buf, env->buflen);
NETLINK_CB(skb).dst_group = 1;
} }
retval = netlink_broadcast_filtered(uevent_sock, skb_get(skb), retval = netlink_broadcast_filtered(uevent_sock, skb_get(skb),