include/net/af_unix.h

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