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Linux/net/netlink/af_netlink.h

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  1 #ifndef _AF_NETLINK_H
  2 #define _AF_NETLINK_H
  3 
  4 #include <linux/rhashtable.h>
  5 #include <linux/atomic.h>
  6 #include <net/sock.h>
  7 
  8 #define NLGRPSZ(x)      (ALIGN(x, sizeof(unsigned long) * 8) / 8)
  9 #define NLGRPLONGS(x)   (NLGRPSZ(x)/sizeof(unsigned long))
 10 
 11 struct netlink_ring {
 12         void                    **pg_vec;
 13         unsigned int            head;
 14         unsigned int            frames_per_block;
 15         unsigned int            frame_size;
 16         unsigned int            frame_max;
 17 
 18         unsigned int            pg_vec_order;
 19         unsigned int            pg_vec_pages;
 20         unsigned int            pg_vec_len;
 21 
 22         atomic_t                pending;
 23 };
 24 
 25 struct netlink_sock {
 26         /* struct sock has to be the first member of netlink_sock */
 27         struct sock             sk;
 28         u32                     portid;
 29         u32                     dst_portid;
 30         u32                     dst_group;
 31         u32                     flags;
 32         u32                     subscriptions;
 33         u32                     ngroups;
 34         unsigned long           *groups;
 35         unsigned long           state;
 36         size_t                  max_recvmsg_len;
 37         wait_queue_head_t       wait;
 38         bool                    bound;
 39         bool                    cb_running;
 40         struct netlink_callback cb;
 41         struct mutex            *cb_mutex;
 42         struct mutex            cb_def_mutex;
 43         void                    (*netlink_rcv)(struct sk_buff *skb);
 44         int                     (*netlink_bind)(struct net *net, int group);
 45         void                    (*netlink_unbind)(struct net *net, int group);
 46         struct module           *module;
 47 #ifdef CONFIG_NETLINK_MMAP
 48         struct mutex            pg_vec_lock;
 49         struct netlink_ring     rx_ring;
 50         struct netlink_ring     tx_ring;
 51         atomic_t                mapped;
 52 #endif /* CONFIG_NETLINK_MMAP */
 53 
 54         struct rhash_head       node;
 55         struct rcu_head         rcu;
 56 };
 57 
 58 static inline struct netlink_sock *nlk_sk(struct sock *sk)
 59 {
 60         return container_of(sk, struct netlink_sock, sk);
 61 }
 62 
 63 static inline bool netlink_skb_is_mmaped(const struct sk_buff *skb)
 64 {
 65 #ifdef CONFIG_NETLINK_MMAP
 66         return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED;
 67 #else
 68         return false;
 69 #endif /* CONFIG_NETLINK_MMAP */
 70 }
 71 
 72 struct netlink_table {
 73         struct rhashtable       hash;
 74         struct hlist_head       mc_list;
 75         struct listeners __rcu  *listeners;
 76         unsigned int            flags;
 77         unsigned int            groups;
 78         struct mutex            *cb_mutex;
 79         struct module           *module;
 80         int                     (*bind)(struct net *net, int group);
 81         void                    (*unbind)(struct net *net, int group);
 82         bool                    (*compare)(struct net *net, struct sock *sock);
 83         int                     registered;
 84 };
 85 
 86 extern struct netlink_table *nl_table;
 87 extern rwlock_t nl_table_lock;
 88 
 89 #endif
 90 

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