LXR linux/net/netlink/af

   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
   9struct 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
  23struct 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        wait_queue_head_t       wait;
  35        bool                    cb_running;
  36        struct netlink_callback cb;
  37        struct mutex            *cb_mutex;
  38        struct mutex            cb_def_mutex;
  39        void                    (*netlink_rcv)(struct sk_buff *skb);
  40        void                    (*netlink_bind)(int group);
  41        struct module           *module;
  42#ifdef CONFIG_NETLINK_MMAP
  43        struct mutex            pg_vec_lock;
  44        struct netlink_ring     rx_ring;
  45        struct netlink_ring     tx_ring;
  46        atomic_t                mapped;
  47#endif /* CONFIG_NETLINK_MMAP */
  48};
  49
  50static inline struct netlink_sock *nlk_sk(struct sock *sk)
  51{
  52        return container_of(sk, struct netlink_sock, sk);
  53}
  54
  55struct nl_portid_hash {
  56        struct hlist_head       *table;
  57        unsigned long           rehash_time;
  58
  59        unsigned int            mask;
  60        unsigned int            shift;
  61
  62        unsigned int            entries;
  63        unsigned int            max_shift;
  64
  65        u32                     rnd;
  66};
  67
  68struct netlink_table {
  69        struct nl_portid_hash   hash;
  70        struct hlist_head       mc_list;
  71        struct listeners __rcu  *listeners;
  72        unsigned int            flags;
  73        unsigned int            groups;
  74        struct mutex            *cb_mutex;
  75        struct module           *module;
  76        void                    (*bind)(int group);
  77        bool                    (*compare)(struct net *net, struct sock *sock);
  78        int                     registered;
  79};
  80
  81extern struct netlink_table *nl_table;
  82extern rwlock_t nl_table_lock;
  83
  84#endif
  85