net/netlink/af_netlink.h

   1 #ifndef _AF_NETLINK_H
   2 #define _AF_NETLINK_H
   3
   4 #include <linux/rhashtable.h>
   5 #include <net/sock.h>
   6
   7 #define NLGRPSZ(x)      (ALIGN(x, sizeof(unsigned long) * 8) / 8)
   8 #define NLGRPLONGS(x)   (NLGRPSZ(x)/sizeof(unsigned long))
   9
  10 struct netlink_ring {
  11         void                    **pg_vec;
  12         unsigned int            head;
  13         unsigned int            frames_per_block;
  14         unsigned int            frame_size;
  15         unsigned int            frame_max;
  16
  17         unsigned int            pg_vec_order;
  18         unsigned int            pg_vec_pages;
  19         unsigned int            pg_vec_len;
  20
  21         atomic_t                pending;
  22 };
  23
  24 struct netlink_sock {
  25         /* struct sock has to be the first member of netlink_sock */
  26         struct sock             sk;
  27         u32                     portid;
  28         u32                     dst_portid;
  29         u32                     dst_group;
  30         u32                     flags;
  31         u32                     subscriptions;
  32         u32                     ngroups;
  33         unsigned long           *groups;
  34         unsigned long           state;
  35         size_t                  max_recvmsg_len;
  36         wait_queue_head_t       wait;
  37         bool                    cb_running;
  38         struct netlink_callback cb;
  39         struct mutex            *cb_mutex;
  40         struct mutex            cb_def_mutex;
  41         void                    (*netlink_rcv)(struct sk_buff *skb);
  42         int                     (*netlink_bind)(struct net *net, int group);
  43         void                    (*netlink_unbind)(struct net *net, int group);
  44         struct module           *module;
  45 #ifdef CONFIG_NETLINK_MMAP
  46         struct mutex            pg_vec_lock;
  47         struct netlink_ring     rx_ring;
  48         struct netlink_ring     tx_ring;
  49         atomic_t                mapped;
  50 #endif /* CONFIG_NETLINK_MMAP */
  51
  52         struct rhash_head       node;
  53 };
  54
  55 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  56 {
  57         return container_of(sk, struct netlink_sock, sk);
  58 }
  59
  60 struct netlink_table {
  61         struct rhashtable       hash;
  62         struct hlist_head       mc_list;
  63         struct listeners __rcu  *listeners;
  64         unsigned int            flags;
  65         unsigned int            groups;
  66         struct mutex            *cb_mutex;
  67         struct module           *module;
  68         int                     (*bind)(struct net *net, int group);
  69         void                    (*unbind)(struct net *net, int group);
  70         bool                    (*compare)(struct net *net, struct sock *sock);
  71         int                     registered;
  72 };
  73
  74 extern struct netlink_table *nl_table;
  75 extern rwlock_t nl_table_lock;
  76 extern struct mutex nl_sk_hash_lock;
  77
  78 #endif