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        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
  52static inline struct netlink_sock *nlk_sk(struct sock *sk)
  53{
  54        return container_of(sk, struct netlink_sock, sk);
  55}
  56
  57struct 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
  70struct 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
  84extern struct netlink_table *nl_table;
  85extern rwlock_t nl_table_lock;
  86
  87#endif
  88