Release 4.14 net/netlink/af_netlink.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _AF_NETLINK_H

#define _AF_NETLINK_H

#include <linux/rhashtable.h>
#include <linux/atomic.h>
#include <linux/workqueue.h>
#include <net/sock.h>

/* flags */

#define NETLINK_F_KERNEL_SOCKET		0x1

#define NETLINK_F_RECV_PKTINFO		0x2

#define NETLINK_F_BROADCAST_SEND_ERROR	0x4

#define NETLINK_F_RECV_NO_ENOBUFS	0x8

#define NETLINK_F_LISTEN_ALL_NSID	0x10

#define NETLINK_F_CAP_ACK		0x20

#define NETLINK_F_EXT_ACK		0x40


#define NLGRPSZ(x)	(ALIGN(x, sizeof(unsigned long) * 8) / 8)

#define NLGRPLONGS(x)	(NLGRPSZ(x)/sizeof(unsigned long))


struct netlink_sock {
	/* struct sock has to be the first member of netlink_sock */
	
struct sock		sk;
	
u32			portid;
	
u32			dst_portid;
	
u32			dst_group;
	
u32			flags;
	
u32			subscriptions;
	
u32			ngroups;
	
unsigned long		*groups;
	
unsigned long		state;
	
size_t			max_recvmsg_len;
	
wait_queue_head_t	wait;
	
bool			bound;
	
bool			cb_running;
	
struct netlink_callback	cb;
	
struct mutex		*cb_mutex;
	
struct mutex		cb_def_mutex;
	
void			(*netlink_rcv)(struct sk_buff *skb);
	
int			(*netlink_bind)(struct net *net, int group);
	
void			(*netlink_unbind)(struct net *net, int group);
	
struct module		*module;

	
struct rhash_head	node;
	
struct rcu_head		rcu;
	
struct work_struct	work;
};



static inline struct netlink_sock *nlk_sk(struct sock *sk)
{
	return container_of(sk, struct netlink_sock, sk);
}

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struct netlink_table {
	
struct rhashtable	hash;
	
struct hlist_head	mc_list;
	
struct listeners __rcu	*listeners;
	
unsigned int		flags;
	
unsigned int		groups;
	
struct mutex		*cb_mutex;
	
struct module		*module;
	
int			(*bind)(struct net *net, int group);
	
void			(*unbind)(struct net *net, int group);
	
bool			(*compare)(struct net *net, struct sock *sock);
	
int			registered;
};

extern struct netlink_table *nl_table;
extern rwlock_t nl_table_lock;

#endif
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Richard Guy Briggs
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Directory: net/netlink

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