1 #ifndef __LINUX_NET_AFUNIX_H 2 #define __LINUX_NET_AFUNIX_H 3 4 #include <linux/config.h> 5 #include <linux/socket.h> 6 #include <linux/un.h> 7 #include <linux/mutex.h> 8 #include <net/sock.h> 9 10 extern void unix_inflight(struct file *fp); 11 extern void unix_notinflight(struct file *fp); 12 extern void unix_gc(void); 13 14 #define UNIX_HASH_SIZE 256 15 16 extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; 17 extern spinlock_t unix_table_lock; 18 19 extern atomic_t unix_tot_inflight; 20 21 static inline struct sock *first_unix_socket(int *i) 22 { 23 for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) { 24 if (!hlist_empty(&unix_socket_table[*i])) 25 return __sk_head(&unix_socket_table[*i]); 26 } 27 return NULL; 28 } 29 30 static inline struct sock *next_unix_socket(int *i, struct sock *s) 31 { 32 struct sock *next = sk_next(s); 33 /* More in this chain? */ 34 if (next) 35 return next; 36 /* Look for next non-empty chain. */ 37 for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) { 38 if (!hlist_empty(&unix_socket_table[*i])) 39 return __sk_head(&unix_socket_table[*i]); 40 } 41 return NULL; 42 } 43 44 #define forall_unix_sockets(i, s) \ 45 for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s))) 46 47 struct unix_address { 48 atomic_t refcnt; 49 int len; 50 unsigned hash; 51 struct sockaddr_un name[0]; 52 }; 53 54 struct unix_skb_parms { 55 struct ucred creds; /* Skb credentials */ 56 struct scm_fp_list *fp; /* Passed files */ 57 }; 58 59 #define UNIXCB(skb) (*(struct unix_skb_parms*)&((skb)->cb)) 60 #define UNIXCREDS(skb) (&UNIXCB((skb)).creds) 61 62 #define unix_state_rlock(s) spin_lock(&unix_sk(s)->lock) 63 #define unix_state_runlock(s) spin_unlock(&unix_sk(s)->lock) 64 #define unix_state_wlock(s) spin_lock(&unix_sk(s)->lock) 65 #define unix_state_wunlock(s) spin_unlock(&unix_sk(s)->lock) 66 67 #ifdef __KERNEL__ 68 /* The AF_UNIX socket */ 69 struct unix_sock { 70 /* WARNING: sk has to be the first member */ 71 struct sock sk; 72 struct unix_address *addr; 73 struct dentry *dentry; 74 struct vfsmount *mnt; 75 struct mutex readlock; 76 struct sock *peer; 77 struct sock *other; 78 struct sock *gc_tree; 79 atomic_t inflight; 80 spinlock_t lock; 81 wait_queue_head_t peer_wait; 82 }; 83 #define unix_sk(__sk) ((struct unix_sock *)__sk) 84 85 #ifdef CONFIG_SYSCTL 86 extern int sysctl_unix_max_dgram_qlen; 87 extern void unix_sysctl_register(void); 88 extern void unix_sysctl_unregister(void); 89 #else 90 static inline void unix_sysctl_register(void) {} 91 static inline void unix_sysctl_unregister(void) {} 92 #endif 93 #endif 94 #endif 95