net/netlink/af_netlink.h

   1 #ifndef _AF_NETLINK_H
   2 #define _AF_NETLINK_H
   3
   4 #include <linux/rhashtable.h>
   5 #include <linux/atomic.h>
   6 #include <linux/workqueue.h>
   7 #include <net/sock.h>
   8
   9 /* flags */
  10 #define NETLINK_F_KERNEL_SOCKET         0x1
  11 #define NETLINK_F_RECV_PKTINFO          0x2
  12 #define NETLINK_F_BROADCAST_SEND_ERROR  0x4
  13 #define NETLINK_F_RECV_NO_ENOBUFS       0x8
  14 #define NETLINK_F_LISTEN_ALL_NSID       0x10
  15 #define NETLINK_F_CAP_ACK               0x20
  16 #define NETLINK_F_EXT_ACK               0x40
  17
  18 #define NLGRPSZ(x)      (ALIGN(x, sizeof(unsigned long) * 8) / 8)
  19 #define NLGRPLONGS(x)   (NLGRPSZ(x)/sizeof(unsigned long))
  20
  21 struct netlink_sock {
  22         /* struct sock has to be the first member of netlink_sock */
  23         struct sock             sk;
  24         u32                     portid;
  25         u32                     dst_portid;
  26         u32                     dst_group;
  27         u32                     flags;
  28         u32                     subscriptions;
  29         u32                     ngroups;
  30         unsigned long           *groups;
  31         unsigned long           state;
  32         size_t                  max_recvmsg_len;
  33         wait_queue_head_t       wait;
  34         bool                    bound;
  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         int                     (*netlink_bind)(struct net *net, int group);
  41         void                    (*netlink_unbind)(struct net *net, int group);
  42         struct module           *module;
  43
  44         struct rhash_head       node;
  45         struct rcu_head         rcu;
  46         struct work_struct      work;
  47 };
  48
  49 static inline struct netlink_sock *nlk_sk(struct sock *sk)
  50 {
  51         return container_of(sk, struct netlink_sock, sk);
  52 }
  53
  54 struct netlink_table {
  55         struct rhashtable       hash;
  56         struct hlist_head       mc_list;
  57         struct listeners __rcu  *listeners;
  58         unsigned int            flags;
  59         unsigned int            groups;
  60         struct mutex            *cb_mutex;
  61         struct module           *module;
  62         int                     (*bind)(struct net *net, int group);
  63         void                    (*unbind)(struct net *net, int group);
  64         bool                    (*compare)(struct net *net, struct sock *sock);
  65         int                     registered;
  66 };
  67
  68 extern struct netlink_table *nl_table;
  69 extern rwlock_t nl_table_lock;
  70
  71 #endif