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 void unix_inflight(struct file *fp); 10 void unix_notinflight(struct file *fp); 11 void unix_gc(void); 12 void wait_for_unix_gc(void); 13 struct sock *unix_get_socket(struct file *filp); 14 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 kuid_t uid; 33 kgid_t gid; 34 struct scm_fp_list *fp; /* Passed files */ 35 #ifdef CONFIG_SECURITY_NETWORK 36 u32 secid; /* Security ID */ 37 #endif 38 u32 consumed; 39 }; 40 41 #define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb)) 42 43 #define unix_state_lock(s) spin_lock(&unix_sk(s)->lock) 44 #define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock) 45 #define unix_state_lock_nested(s) \ 46 spin_lock_nested(&unix_sk(s)->lock, \ 47 SINGLE_DEPTH_NESTING) 48 49 /* The AF_UNIX socket */ 50 struct unix_sock { 51 /* WARNING: sk has to be the first member */ 52 struct sock sk; 53 struct unix_address *addr; 54 struct path path; 55 struct mutex readlock; 56 struct sock *peer; 57 struct list_head link; 58 atomic_long_t inflight; 59 spinlock_t lock; 60 unsigned char recursion_level; 61 unsigned long gc_flags; 62 #define UNIX_GC_CANDIDATE 0 63 #define UNIX_GC_MAYBE_CYCLE 1 64 struct socket_wq peer_wq; 65 wait_queue_t peer_wake; 66 }; 67 68 static inline struct unix_sock *unix_sk(const struct sock *sk) 69 { 70 return (struct unix_sock *)sk; 71 } 72 73 #define peer_wait peer_wq.wait 74 75 long unix_inq_len(struct sock *sk); 76 long unix_outq_len(struct sock *sk); 77 78 #ifdef CONFIG_SYSCTL 79 int unix_sysctl_register(struct net *net); 80 void unix_sysctl_unregister(struct net *net); 81 #else 82 static inline int unix_sysctl_register(struct net *net) { return 0; } 83 static inline void unix_sysctl_unregister(struct net *net) {} 84 #endif 85 #endif 86