include/net/af_unix.h

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