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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/net/netlink/af_netlink.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef _AF_NETLINK_H

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#define _AF_NETLINK_H

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#include <linux/rhashtable.h>

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#include <linux/atomic.h>

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#include <net/sock.h>

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/* flags */

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enum {

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	NETLINK_F_KERNEL_SOCKET,

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	NETLINK_F_RECV_PKTINFO,

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	NETLINK_F_BROADCAST_SEND_ERROR,

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	NETLINK_F_RECV_NO_ENOBUFS,

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	NETLINK_F_LISTEN_ALL_NSID,

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	NETLINK_F_CAP_ACK,

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	NETLINK_F_EXT_ACK,

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	NETLINK_F_STRICT_CHK,

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};

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

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

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struct netlink_sock {

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	/* struct sock has to be the first member of netlink_sock */

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	struct sock		sk;

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	unsigned long		flags;

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	u32			portid;

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	u32			dst_portid;

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	u32			dst_group;

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	u32			subscriptions;

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	u32			ngroups;

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	unsigned long		*groups;

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	unsigned long		state;

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	size_t			max_recvmsg_len;

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	wait_queue_head_t	wait;

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	bool			bound;

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	bool			cb_running;

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	int			dump_done_errno;

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	struct netlink_callback	cb;

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	struct mutex		nl_cb_mutex;

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	void			(*netlink_rcv)(struct sk_buff *skb);

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	int			(*netlink_bind)(struct net *net, int group);

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	void			(*netlink_unbind)(struct net *net, int group);

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	void			(*netlink_release)(struct sock *sk,

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						   unsigned long *groups);

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	struct module		*module;

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	struct rhash_head	node;

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	struct rcu_head		rcu;

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};

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static inline struct netlink_sock *nlk_sk(struct sock *sk)

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{

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	return container_of(sk, struct netlink_sock, sk);

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}

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#define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)

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struct netlink_table {

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	struct rhashtable	hash;

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	struct hlist_head	mc_list;

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	struct listeners __rcu	*listeners;

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	unsigned int		flags;

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	unsigned int		groups;

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	struct mutex		*cb_mutex;

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	struct module		*module;

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	int			(*bind)(struct net *net, int group);

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	void			(*unbind)(struct net *net, int group);

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	void                    (*release)(struct sock *sk,

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					   unsigned long *groups);

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	int			registered;

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};

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extern struct netlink_table *nl_table;

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extern rwlock_t nl_table_lock;

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#endif

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