target/linux/generic/hack-5.4/911-kobject_add_broadcast_uevent.patch

   1 From 0d37e6edc09c99e683dd91ca0e83bbc0df8477b3 Mon Sep 17 00:00:00 2001
   2 From: Felix Fietkau <nbd@nbd.name>
   3 Date: Sun, 16 Jul 2017 16:56:10 +0200
   4 Subject: lib: add uevent_next_seqnum()
   5
   6 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   7 ---
   8  include/linux/kobject.h |  5 +++++
   9  lib/kobject_uevent.c    | 37 +++++++++++++++++++++++++++++++++++++
  10  2 files changed, 42 insertions(+)
  11
  12 --- a/include/linux/kobject.h
  13 +++ b/include/linux/kobject.h
  14 @@ -32,6 +32,8 @@
  15  #define UEVENT_NUM_ENVP                        32      /* number of env pointers */
  16  #define UEVENT_BUFFER_SIZE             2048    /* buffer for the variables */
  17
  18 +struct sk_buff;
  19 +
  20  #ifdef CONFIG_UEVENT_HELPER
  21  /* path to the userspace helper executed on an event */
  22  extern char uevent_helper[];
  23 @@ -245,4 +247,7 @@ int kobject_synth_uevent(struct kobject
  24  __printf(2, 3)
  25  int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...);
  26
  27 +int broadcast_uevent(struct sk_buff *skb, __u32 pid, __u32 group,
  28 +                    gfp_t allocation);
  29 +
  30  #endif /* _KOBJECT_H_ */
  31 --- a/lib/kobject_uevent.c
  32 +++ b/lib/kobject_uevent.c
  33 @@ -690,6 +690,43 @@ int add_uevent_var(struct kobj_uevent_en
  34  EXPORT_SYMBOL_GPL(add_uevent_var);
  35
  36  #if defined(CONFIG_NET)
  37 +int broadcast_uevent(struct sk_buff *skb, __u32 pid, __u32 group,
  38 +                    gfp_t allocation)
  39 +{
  40 +       struct uevent_sock *ue_sk;
  41 +       int err = 0;
  42 +
  43 +       /* send netlink message */
  44 +       mutex_lock(&uevent_sock_mutex);
  45 +       list_for_each_entry(ue_sk, &uevent_sock_list, list) {
  46 +               struct sock *uevent_sock = ue_sk->sk;
  47 +               struct sk_buff *skb2;
  48 +
  49 +               skb2 = skb_clone(skb, allocation);
  50 +               if (!skb2)
  51 +                       break;
  52 +
  53 +               err = netlink_broadcast(uevent_sock, skb2, pid, group,
  54 +                                       allocation);
  55 +               if (err)
  56 +                       break;
  57 +       }
  58 +       mutex_unlock(&uevent_sock_mutex);
  59 +
  60 +       kfree_skb(skb);
  61 +       return err;
  62 +}
  63 +#else
  64 +int broadcast_uevent(struct sk_buff *skb, __u32 pid, __u32 group,
  65 +                    gfp_t allocation)
  66 +{
  67 +       kfree_skb(skb);
  68 +       return 0;
  69 +}
  70 +#endif
  71 +EXPORT_SYMBOL_GPL(broadcast_uevent);
  72 +
  73 +#if defined(CONFIG_NET)
  74  static int uevent_net_broadcast(struct sock *usk, struct sk_buff *skb,
  75                                 struct netlink_ext_ack *extack)
  76  {