net/netlink/af_netlink.h

   1 #ifndef _AF_NETLINK_H
   2 #define _AF_NETLINK_H
   3
   4 #include <net/sock.h>
   5
   6 #define NLGRPSZ(x)      (ALIGN(x, sizeof(unsigned long) * 8) / 8)
   7 #define NLGRPLONGS(x)   (NLGRPSZ(x)/sizeof(unsigned long))
   8
   9 struct netlink_ring {
  10         void                    **pg_vec;
  11         unsigned int            head;
  12         unsigned int            frames_per_block;
  13         unsigned int            frame_size;
  14         unsigned int            frame_max;
  15
  16         unsigned int            pg_vec_order;
  17         unsigned int            pg_vec_pages;
  18         unsigned int            pg_vec_len;
  19
  20         atomic_t                pending;
  21 };
  22
  23 struct netlink_sock {
  24         /* struct sock has to be the first member of netlink_sock */
  25         struct sock             sk;
  26         u32                     portid;
  27         u32                     dst_portid;
  28         u32                     dst_group;
  29         u32                     flags;
  30         u32                     subscriptions;
  31         u32                     ngroups;
  32         unsigned long           *groups;
  33         unsigned long           state;
  34         size_t                  max_recvmsg_len;
  35         wait_queue_head_t       wait;
  36         bool                    cb_running;
  37         struct netlink_callback cb;
  38         struct mutex            *cb_mutex;
  39         struct mutex            cb_def_mutex;
  40         void                    (*netlink_rcv)(struct sk_buff *skb);
  41         int                     (*netlink_bind)(int group);
  42         void                    (*netlink_unbind)(int group);
  43         struct module           *module;
  44 #ifdef CONFIG_NETLINK_MMAP
  45         struct mutex            pg_vec_lock;
  46         struct netlink_ring     rx_ring;
  47         struct netlink_ring     tx_ring;
  48         atomic_t                mapped;
  49 #endif /* CONFIG_NETLINK_MMAP */
  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 nl_portid_hash {
  58         struct hlist_head       *table;
  59         unsigned long           rehash_time;
  60
  61         unsigned int            mask;
  62         unsigned int            shift;
  63
  64         unsigned int            entries;
  65         unsigned int            max_shift;
  66
  67         u32                     rnd;
  68 };
  69
  70 struct netlink_table {
  71         struct nl_portid_hash   hash;
  72         struct hlist_head       mc_list;
  73         struct listeners __rcu  *listeners;
  74         unsigned int            flags;
  75         unsigned int            groups;
  76         struct mutex            *cb_mutex;
  77         struct module           *module;
  78         int                     (*bind)(int group);
  79         void                    (*unbind)(int group);
  80         bool                    (*compare)(struct net *net, struct sock *sock);
  81         int                     registered;
  82 };
  83
  84 extern struct netlink_table *nl_table;
  85 extern rwlock_t nl_table_lock;
  86
  87 #endif