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