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 <net/sock.h> 8 9 extern void unix_inflight(struct file *fp); 10 extern void unix_notinflight(struct file *fp); 11 extern void unix_gc(void); 12 extern void wait_for_unix_gc(void); 13 extern struct sock *unix_get_socket(struct file *filp); 14 extern struct sock *unix_peer_get(struct sock *); 15 16 #define UNIX_HASH_SIZE 256 17 #define UNIX_HASH_BITS 8 18 19 extern unsigned int unix_tot_inflight; 20 extern spinlock_t unix_table_lock; 21 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; 22 23 struct unix_address { 24 atomic_t refcnt; 25 int len; 26 unsigned int hash; 27 struct sockaddr_un name[0]; 28 }; 29 30 struct unix_skb_parms { 31 struct pid *pid; /* Skb credentials */ 32 const struct cred *cred; 33 struct scm_fp_list *fp; /* Passed files */ 34 #ifdef CONFIG_SECURITY_NETWORK 35 u32 secid; /* Security ID */ 36 #endif 37 }; 38 39 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 40 #define UNIXSID(skb) (&UNIXCB((skb)).secid) 41 42 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 43 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 44 #define unix_state_lock_nested(s) \ 45 spin_lock_nested(&unix_sk(s)->lock, \ 46 SINGLE_DEPTH_NESTING) 47 48 /* The AF_UNIX socket */ 49 struct unix_sock { 50 /* WARNING: sk has to be the first member */ 51 struct sock sk; 52 struct unix_address *addr; 53 struct path path; 54 struct mutex readlock; 55 struct sock *peer; 56 struct list_head link; 57 atomic_long_t inflight; 58 spinlock_t lock; 59 unsigned int gc_candidate : 1; 60 unsigned int gc_maybe_cycle : 1; 61 unsigned char recursion_level; 62 struct socket_wq peer_wq; 63 }; 64 #define unix_sk(__sk) ((struct unix_sock *)__sk) 65 66 #define peer_wait peer_wq.wait 67 68 long unix_inq_len(struct sock *sk); 69 long unix_outq_len(struct sock *sk); 70 71 #ifdef CONFIG_SYSCTL 72 extern int unix_sysctl_register(struct net *net); 73 extern void unix_sysctl_unregister(struct net *net); 74 #else 75 static inline int unix_sysctl_register(struct net *net) { return 0; } 76 static inline void unix_sysctl_unregister(struct net *net) {} 77 #endif 78 #endif 79