/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef __LINUX_NET_AFUNIX_H
  #define __LINUX_NET_AFUNIX_H

  #include <linux/socket.h>
  #include <linux/un.h>

  #include <linux/mutex.h>

  #include <linux/refcount.h>

  #include <net/sock.h>

  void unix_inflight(struct user_struct *user, struct file *fp);
  void unix_notinflight(struct user_struct *user, struct file *fp);

  void unix_gc(void);
  void wait_for_unix_gc(void);
  struct sock *unix_get_socket(struct file *filp);
  struct sock *unix_peer_get(struct sock *);

  
  #define UNIX_HASH_SIZE	256

  #define UNIX_HASH_BITS	8

  extern unsigned int unix_tot_inflight;

  extern spinlock_t unix_table_lock;

  extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];

  struct unix_address {

  	refcount_t	refcnt;

  	int		len;

  	unsigned int	hash;

  	struct sockaddr_un name[0];
  };
  
  struct unix_skb_parms {

  	struct pid		*pid;		/* Skb credentials	*/

  	kuid_t			uid;
  	kgid_t			gid;

  	struct scm_fp_list	*fp;		/* Passed files		*/

  #ifdef CONFIG_SECURITY_NETWORK

  	u32			secid;		/* Security ID		*/

  #endif

  	u32			consumed;

  } __randomize_layout;

  #define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))

  #define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
  #define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
  #define unix_state_lock_nested(s) \

  				spin_lock_nested(&unix_sk(s)->lock, \
  				SINGLE_DEPTH_NESTING)

  /* The AF_UNIX socket */
  struct unix_sock {
  	/* WARNING: sk has to be the first member */
  	struct sock		sk;

  	struct unix_address     *addr;

  	struct path		path;

  	struct mutex		iolock, bindlock;

  	struct sock		*peer;

  	struct list_head	link;

  	atomic_long_t		inflight;
  	spinlock_t		lock;

  	unsigned long		gc_flags;
  #define UNIX_GC_CANDIDATE	0
  #define UNIX_GC_MAYBE_CYCLE	1

  	struct socket_wq	peer_wq;

  	wait_queue_entry_t		peer_wake;

  };

  static inline struct unix_sock *unix_sk(const struct sock *sk)

  {
  	return (struct unix_sock *)sk;
  }

  #define peer_wait peer_wq.wait

  long unix_inq_len(struct sock *sk);
  long unix_outq_len(struct sock *sk);

  #ifdef CONFIG_SYSCTL

  int unix_sysctl_register(struct net *net);
  void unix_sysctl_unregister(struct net *net);

  #else

  static inline int unix_sysctl_register(struct net *net) { return 0; }
  static inline void unix_sysctl_unregister(struct net *net) {}

  #endif

  #endif