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 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 #ifdef CONFIG_SECURITY_NETWORK 57 u32 secid; /* Security ID */ 58 #endif 59 }; 60 61 #define UNIXCB(skb) (*(struct unix_skb_parms*)&((skb)->cb)) 62 #define UNIXCREDS(skb) (&UNIXCB((skb)).creds) 63 #define UNIXSID(skb) (&UNIXCB((skb)).secid) 64 65 #define unix_state_rlock(s) spin_lock(&unix_sk(s)->lock) 66 #define unix_state_runlock(s) spin_unlock(&unix_sk(s)->lock) 67 #define unix_state_wlock(s) spin_lock(&unix_sk(s)->lock) 68 #define unix_state_wlock_nested(s) \ 69 spin_lock_nested(&unix_sk(s)->lock, \ 70 SINGLE_DEPTH_NESTING) 71 #define unix_state_wunlock(s) spin_unlock(&unix_sk(s)->lock) 72 73 #ifdef __KERNEL__ 74 /* The AF_UNIX socket */ 75 struct unix_sock { 76 /* WARNING: sk has to be the first member */ 77 struct sock sk; 78 struct unix_address *addr; 79 struct dentry *dentry; 80 struct vfsmount *mnt; 81 struct mutex readlock; 82 struct sock *peer; 83 struct sock *other; 84 struct sock *gc_tree; 85 atomic_t inflight; 86 spinlock_t lock; 87 wait_queue_head_t peer_wait; 88 }; 89 #define unix_sk(__sk) ((struct unix_sock *)__sk) 90 91 #ifdef CONFIG_SYSCTL 92 extern int sysctl_unix_max_dgram_qlen; 93 extern void unix_sysctl_register(void); 94 extern void unix_sysctl_unregister(void); 95 #else 96 static inline void unix_sysctl_register(void) {} 97 static inline void unix_sysctl_unregister(void) {} 98 #endif 99 #endif 100 #endif 101