1 #ifndef __LINUX_NET_AFUNIX_H 2 #define __LINUX_NET_AFUNIX_H 3 4 #include <linux/socket.h> 5 #include <linux/un.h> 6 #include <linux/mutex.h> 7 #include <linux/refcount.h> 8 #include <net/sock.h> 9 10 void unix_inflight(struct user_struct *user, struct file *fp); 11 void unix_notinflight(struct user_struct *user, struct file *fp); 12 void unix_gc(void); 13 void wait_for_unix_gc(void); 14 struct sock *unix_get_socket(struct file *filp); 15 struct sock *unix_peer_get(struct sock *); 16 17 #define UNIX_HASH_SIZE 256 18 #define UNIX_HASH_BITS 8 19 20 extern unsigned int unix_tot_inflight; 21 extern spinlock_t unix_table_lock; 22 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; 23 24 struct unix_address { 25 refcount_t refcnt; 26 int len; 27 unsigned int hash; 28 struct sockaddr_un name[0]; 29 }; 30 31 struct unix_skb_parms { 32 struct pid *pid; /* Skb credentials */ 33 kuid_t uid; 34 kgid_t gid; 35 struct scm_fp_list *fp; /* Passed files */ 36 #ifdef CONFIG_SECURITY_NETWORK 37 u32 secid; /* Security ID */ 38 #endif 39 u32 consumed; 40 } __randomize_layout; 41 42 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 43 44 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 45 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 46 #define unix_state_lock_nested(s) \ 47 spin_lock_nested(&unix_sk(s)->lock, \ 48 SINGLE_DEPTH_NESTING) 49 50 /* The AF_UNIX socket */ 51 struct 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 char recursion_level; 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