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 11struct 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 25struct 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 cb_running; 39 struct netlink_callback cb; 40 struct mutex *cb_mutex; 41 struct mutex cb_def_mutex; 42 void (*netlink_rcv)(struct sk_buff *skb); 43 int (*netlink_bind)(struct net *net, int group); 44 void (*netlink_unbind)(struct net *net, int group); 45 struct module *module; 46#ifdef CONFIG_NETLINK_MMAP 47 struct mutex pg_vec_lock; 48 struct netlink_ring rx_ring; 49 struct netlink_ring tx_ring; 50 atomic_t mapped; 51#endif /* CONFIG_NETLINK_MMAP */ 52 53 struct rhash_head node; 54 struct rcu_head rcu; 55}; 56 57static inline struct netlink_sock *nlk_sk(struct sock *sk) 58{ 59 return container_of(sk, struct netlink_sock, sk); 60} 61 62struct netlink_table { 63 struct rhashtable hash; 64 struct hlist_head mc_list; 65 struct listeners __rcu *listeners; 66 unsigned int flags; 67 unsigned int groups; 68 struct mutex *cb_mutex; 69 struct module *module; 70 int (*bind)(struct net *net, int group); 71 void (*unbind)(struct net *net, int group); 72 bool (*compare)(struct net *net, struct sock *sock); 73 int registered; 74}; 75 76extern struct netlink_table *nl_table; 77extern rwlock_t nl_table_lock; 78 79#endif 80