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 11 void unix_inflight(struct user_struct *user, struct file *fp); 12 void unix_notinflight(struct user_struct *user, struct file *fp); 13 void unix_gc(void); 14 void wait_for_unix_gc(void); 15 struct sock *unix_get_socket(struct file *filp); 16 struct sock *unix_peer_get(struct sock *sk); 17 18 #define UNIX_HASH_SIZE 256 19 #define UNIX_HASH_BITS 8 20 21 extern unsigned int unix_tot_inflight; 22 extern spinlock_t unix_table_lock; 23 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; 24 25 struct unix_address { 26 refcount_t refcnt; 27 int len; 28 unsigned int hash; 29 struct sockaddr_un name[0]; 30 }; 31 32 struct unix_skb_parms { 33 struct pid *pid; /* Skb credentials */ 34 kuid_t uid; 35 kgid_t gid; 36 struct scm_fp_list *fp; /* Passed files */ 37 #ifdef CONFIG_SECURITY_NETWORK 38 u32 secid; /* Security ID */ 39 #endif 40 u32 consumed; 41 } __randomize_layout; 42 43 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 44 45 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 46 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 47 #define unix_state_lock_nested(s) \ 48 spin_lock_nested(&unix_sk(s)->lock, \ 49 SINGLE_DEPTH_NESTING) 50 51 /* The AF_UNIX socket */ 52 struct unix_sock { 53 /* WARNING: sk has to be the first member */ 54 struct sock sk; 55 struct unix_address *addr; 56 struct path path; 57 struct mutex iolock, bindlock; 58 struct sock *peer; 59 struct list_head link; 60 atomic_long_t inflight; 61 spinlock_t lock; 62 unsigned long gc_flags; 63 #define UNIX_GC_CANDIDATE 0 64 #define UNIX_GC_MAYBE_CYCLE 1 65 struct socket_wq peer_wq; 66 wait_queue_entry_t peer_wake; 67 }; 68 69 static inline struct unix_sock *unix_sk(const struct sock *sk) 70 { 71 return (struct unix_sock *)sk; 72 } 73 74 #define peer_wait peer_wq.wait 75 76 long unix_inq_len(struct sock *sk); 77 long unix_outq_len(struct sock *sk); 78 79 #ifdef CONFIG_SYSCTL 80 int unix_sysctl_register(struct net *net); 81 void unix_sysctl_unregister(struct net *net); 82 #else 83 static inline int unix_sysctl_register(struct net *net) { return 0; } 84 static inline void unix_sysctl_unregister(struct net *net) {} 85 #endif 86 #endif 87