net/netlink/af_netlink.h

   1 #ifndef _AF_NETLINK_H
   2 #define _AF_NETLINK_H
   3
   4 #include <linux/rhashtable.h>
   5 #include <linux/atomic.h>
   6 #include <linux/workqueue.h>
   7 #include <net/sock.h>
   8
   9 #define NLGRPSZ(x)      (ALIGN(x, sizeof(unsigned long) * 8) / 8)
  10 #define NLGRPLONGS(x)   (NLGRPSZ(x)/sizeof(unsigned long))
  11
  12 struct netlink_sock {
  13         /* struct sock has to be the first member of netlink_sock */
  14         struct sock             sk;
  15         u32                     portid;
  16         u32                     dst_portid;
  17         u32                     dst_group;
  18         u32                     flags;
  19         u32                     subscriptions;
  20         u32                     ngroups;
  21         unsigned long           *groups;
  22         unsigned long           state;
  23         size_t                  max_recvmsg_len;
  24         wait_queue_head_t       wait;
  25         bool                    bound;
  26         bool                    cb_running;
  27         struct netlink_callback cb;
  28         struct mutex            *cb_mutex;
  29         struct mutex            cb_def_mutex;
  30         void                    (*netlink_rcv)(struct sk_buff *skb);
  31         int                     (*netlink_bind)(struct net *net, int group);
  32         void                    (*netlink_unbind)(struct net *net, int group);
  33         struct module           *module;
  34
  35         struct rhash_head       node;
  36         struct rcu_head         rcu;
  37         struct work_struct      work;
  38 };
  39
  40 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  41 {
  42         return container_of(sk, struct netlink_sock, sk);
  43 }
  44
  45 struct netlink_table {
  46         struct rhashtable       hash;
  47         struct hlist_head       mc_list;
  48         struct listeners __rcu  *listeners;
  49         unsigned int            flags;
  50         unsigned int            groups;
  51         struct mutex            *cb_mutex;
  52         struct module           *module;
  53         int                     (*bind)(struct net *net, int group);
  54         void                    (*unbind)(struct net *net, int group);
  55         bool                    (*compare)(struct net *net, struct sock *sock);
  56         int                     registered;
  57 };
  58
  59 extern struct netlink_table *nl_table;
  60 extern rwlock_t nl_table_lock;
  61
  62 #endif