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         void                    (*netlink_bind)(int group);
  42         struct module           *module;
  43 #ifdef CONFIG_NETLINK_MMAP
  44         struct mutex            pg_vec_lock;
  45         struct netlink_ring     rx_ring;
  46         struct netlink_ring     tx_ring;
  47         atomic_t                mapped;
  48 #endif /* CONFIG_NETLINK_MMAP */
  49 };
  50
  51 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  52 {
  53         return container_of(sk, struct netlink_sock, sk);
  54 }
  55
  56 struct nl_portid_hash {
  57         struct hlist_head       *table;
  58         unsigned long           rehash_time;
  59
  60         unsigned int            mask;
  61         unsigned int            shift;
  62
  63         unsigned int            entries;
  64         unsigned int            max_shift;
  65
  66         u32                     rnd;
  67 };
  68
  69 struct netlink_table {
  70         struct nl_portid_hash   hash;
  71         struct hlist_head       mc_list;
  72         struct listeners __rcu  *listeners;
  73         unsigned int            flags;
  74         unsigned int            groups;
  75         struct mutex            *cb_mutex;
  76         struct module           *module;
  77         void                    (*bind)(int group);
  78         bool                    (*compare)(struct net *net, struct sock *sock);
  79         int                     registered;
  80 };
  81
  82 extern struct netlink_table *nl_table;
  83 extern rwlock_t nl_table_lock;
  84
  85 #endif