1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __LINUX_NET_AFUNIX_H 3#define __LINUX_NET_AFUNIX_H 4 5#include <linux/socket.h> 6#include <linux/un.h> 7#include <linux/mutex.h> 8#include <linux/refcount.h> 9#include <net/sock.h> 10 11void unix_inflight(struct user_struct *user, struct file *fp); 12void unix_notinflight(struct user_struct *user, struct file *fp); 13void unix_destruct_scm(struct sk_buff *skb); 14void unix_gc(void); 15void wait_for_unix_gc(void); 16struct sock *unix_get_socket(struct file *filp); 17struct sock *unix_peer_get(struct sock *sk); 18 19#define UNIX_HASH_SIZE 256 20#define UNIX_HASH_BITS 8 21 22extern unsigned int unix_tot_inflight; 23extern spinlock_t unix_table_lock; 24extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; 25 26struct unix_address { 27 refcount_t refcnt; 28 int len; 29 unsigned int hash; 30 struct sockaddr_un name[]; 31}; 32 33struct unix_skb_parms { 34 struct pid *pid; /* Skb credentials */ 35 kuid_t uid; 36 kgid_t gid; 37 struct scm_fp_list *fp; /* Passed files */ 38#ifdef CONFIG_SECURITY_NETWORK 39 u32 secid; /* Security ID */ 40#endif 41 u32 consumed; 42} __randomize_layout; 43 44struct scm_stat { 45 atomic_t nr_fds; 46}; 47 48#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 49 50/* The AF_UNIX socket */ 51struct unix_sock { 52 /* WARNING: sk has to be the first member */ 53 struct sock sk; 54 struct unix_address *addr; 55 struct path path; 56 struct mutex iolock, bindlock; 57 struct sock *peer; 58 struct list_head link; 59 atomic_long_t inflight; 60 spinlock_t lock; 61 unsigned long gc_flags; 62#define UNIX_GC_CANDIDATE 0 63#define UNIX_GC_MAYBE_CYCLE 1 64 struct socket_wq peer_wq; 65 wait_queue_entry_t peer_wake; 66 struct scm_stat scm_stat; 67}; 68 69static inline struct unix_sock *unix_sk(const struct sock *sk) 70{ 71 return (struct unix_sock *)sk; 72} 73 74#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 75#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 76enum unix_socket_lock_class { 77 U_LOCK_NORMAL, 78 U_LOCK_SECOND, /* for double locking, see unix_state_double_lock(). */ 79 U_LOCK_DIAG, /* used while dumping icons, see sk_diag_dump_icons(). */ 80}; 81 82static inline void unix_state_lock_nested(struct sock *sk, 83 enum unix_socket_lock_class subclass) 84{ 85 spin_lock_nested(&unix_sk(sk)->lock, subclass); 86} 87 88#define peer_wait peer_wq.wait 89 90long unix_inq_len(struct sock *sk); 91long unix_outq_len(struct sock *sk); 92 93#ifdef CONFIG_SYSCTL 94int unix_sysctl_register(struct net *net); 95void unix_sysctl_unregister(struct net *net); 96#else 97static inline int unix_sysctl_register(struct net *net) { return 0; } 98static inline void unix_sysctl_unregister(struct net *net) {} 99#endif 100#endif 101