include/net/af_unix.h

   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 <linux/mutex.h>
   8 #include <net/sock.h>
   9
  10 extern void unix_inflight(struct file *fp);
  11 extern void unix_notinflight(struct file *fp);
  12 extern void unix_gc(void);
  13
  14 #define UNIX_HASH_SIZE  256
  15
  16 extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
  17 extern spinlock_t unix_table_lock;
  18
  19 extern atomic_t unix_tot_inflight;
  20
  21 static inline struct sock *first_unix_socket(int *i)
  22 {
  23         for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
  24                 if (!hlist_empty(&unix_socket_table[*i]))
  25                         return __sk_head(&unix_socket_table[*i]);
  26         }
  27         return NULL;
  28 }
  29
  30 static inline struct sock *next_unix_socket(int *i, struct sock *s)
  31 {
  32         struct sock *next = sk_next(s);
  33         /* More in this chain? */
  34         if (next)
  35                 return next;
  36         /* Look for next non-empty chain. */
  37         for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
  38                 if (!hlist_empty(&unix_socket_table[*i]))
  39                         return __sk_head(&unix_socket_table[*i]);
  40         }
  41         return NULL;
  42 }
  43
  44 #define forall_unix_sockets(i, s) \
  45         for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s)))
  46
  47 struct unix_address {
  48         atomic_t        refcnt;
  49         int             len;
  50         unsigned        hash;
  51         struct sockaddr_un name[0];
  52 };
  53
  54 struct unix_skb_parms {
  55         struct ucred            creds;          /* Skb credentials      */
  56         struct scm_fp_list      *fp;            /* Passed files         */
  57 };
  58
  59 #define UNIXCB(skb)     (*(struct unix_skb_parms*)&((skb)->cb))
  60 #define UNIXCREDS(skb)  (&UNIXCB((skb)).creds)
  61
  62 #define unix_state_rlock(s)     spin_lock(&unix_sk(s)->lock)
  63 #define unix_state_runlock(s)   spin_unlock(&unix_sk(s)->lock)
  64 #define unix_state_wlock(s)     spin_lock(&unix_sk(s)->lock)
  65 #define unix_state_wunlock(s)   spin_unlock(&unix_sk(s)->lock)
  66
  67 #ifdef __KERNEL__
  68 /* The AF_UNIX socket */
  69 struct unix_sock {
  70         /* WARNING: sk has to be the first member */
  71         struct sock             sk;
  72         struct unix_address     *addr;
  73         struct dentry           *dentry;
  74         struct vfsmount         *mnt;
  75         struct mutex            readlock;
  76         struct sock             *peer;
  77         struct sock             *other;
  78         struct sock             *gc_tree;
  79         atomic_t                inflight;
  80         spinlock_t              lock;
  81         wait_queue_head_t       peer_wait;
  82 };
  83 #define unix_sk(__sk) ((struct unix_sock *)__sk)
  84
  85 #ifdef CONFIG_SYSCTL
  86 extern int sysctl_unix_max_dgram_qlen;
  87 extern void unix_sysctl_register(void);
  88 extern void unix_sysctl_unregister(void);
  89 #else
  90 static inline void unix_sysctl_register(void) {}
  91 static inline void unix_sysctl_unregister(void) {}
  92 #endif
  93 #endif
  94 #endif