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         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
  50 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  51 {
  52         return container_of(sk, struct netlink_sock, sk);
  53 }
  54
  55 struct 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
  68 static inline bool netlink_skb_is_mmaped(const struct sk_buff *skb)
  69 {
  70 #ifdef CONFIG_NETLINK_MMAP
  71         return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED;
  72 #else
  73         return false;
  74 #endif /* CONFIG_NETLINK_MMAP */
  75 }
  76
  77 struct netlink_table {
  78         struct nl_portid_hash   hash;
  79         struct hlist_head       mc_list;
  80         struct listeners __rcu  *listeners;
  81         unsigned int            flags;
  82         unsigned int            groups;
  83         struct mutex            *cb_mutex;
  84         struct module           *module;
  85         void                    (*bind)(int group);
  86         bool                    (*compare)(struct net *net, struct sock *sock);
  87         int                     registered;
  88 };
  89
  90 extern struct netlink_table *nl_table;
  91 extern rwlock_t nl_table_lock;
  92
  93 #endif