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