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