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_ring {
  12         void                    **pg_vec;
  13         unsigned int            head;
  14         unsigned int            frames_per_block;
  15         unsigned int            frame_size;
  16         unsigned int            frame_max;
  17
  18         unsigned int            pg_vec_order;
  19         unsigned int            pg_vec_pages;
  20         unsigned int            pg_vec_len;
  21
  22         atomic_t                pending;
  23 };
  24
  25 struct netlink_sock {
  26         /* struct sock has to be the first member of netlink_sock */
  27         struct sock             sk;
  28         u32                     portid;
  29         u32                     dst_portid;
  30         u32                     dst_group;
  31         u32                     flags;
  32         u32                     subscriptions;
  33         u32                     ngroups;
  34         unsigned long           *groups;
  35         unsigned long           state;
  36         size_t                  max_recvmsg_len;
  37         wait_queue_head_t       wait;
  38         bool                    bound;
  39         bool                    cb_running;
  40         struct netlink_callback cb;
  41         struct mutex            *cb_mutex;
  42         struct mutex            cb_def_mutex;
  43         void                    (*netlink_rcv)(struct sk_buff *skb);
  44         int                     (*netlink_bind)(struct net *net, int group);
  45         void                    (*netlink_unbind)(struct net *net, int group);
  46         struct module           *module;
  47
  48         struct rhash_head       node;
  49         struct rcu_head         rcu;
  50 };
  51
  52 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  53 {
  54         return container_of(sk, struct netlink_sock, sk);
  55 }
  56
  57 struct netlink_table {
  58         struct rhashtable       hash;
  59         struct hlist_head       mc_list;
  60         struct listeners __rcu  *listeners;
  61         unsigned int            flags;
  62         unsigned int            groups;
  63         struct mutex            *cb_mutex;
  64         struct module           *module;
  65         int                     (*bind)(struct net *net, int group);
  66         void                    (*unbind)(struct net *net, int group);
  67         bool                    (*compare)(struct net *net, struct sock *sock);
  68         int                     registered;
  69 };
  70
  71 extern struct netlink_table *nl_table;
  72 extern rwlock_t nl_table_lock;
  73
  74 #endif