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