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         u32                     secid;          /* Security ID          */
  58 #endif
  59 };
  60
  61 #define UNIXCB(skb)     (*(struct unix_skb_parms*)&((skb)->cb))
  62 #define UNIXCREDS(skb)  (&UNIXCB((skb)).creds)
  63 #define UNIXSID(skb)    (&UNIXCB((skb)).secid)
  64
  65 #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  66 #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  67 #define unix_state_lock_nested(s) \
  68                                 spin_lock_nested(&unix_sk(s)->lock, \
  69                                 SINGLE_DEPTH_NESTING)
  70
  71 #ifdef __KERNEL__
  72 /* The AF_UNIX socket */
  73 struct unix_sock {
  74         /* WARNING: sk has to be the first member */
  75         struct sock             sk;
  76         struct unix_address     *addr;
  77         struct dentry           *dentry;
  78         struct vfsmount         *mnt;
  79         struct mutex            readlock;
  80         struct sock             *peer;
  81         struct sock             *other;
  82         struct list_head        link;
  83         atomic_t                inflight;
  84         spinlock_t              lock;
  85         unsigned int            gc_candidate : 1;
  86         wait_queue_head_t       peer_wait;
  87 };
  88 #define unix_sk(__sk) ((struct unix_sock *)__sk)
  89
  90 #ifdef CONFIG_SYSCTL
  91 extern int sysctl_unix_max_dgram_qlen;
  92 extern void unix_sysctl_register(void);
  93 extern void unix_sysctl_unregister(void);
  94 #else
  95 static inline void unix_sysctl_register(void) {}
  96 static inline void unix_sysctl_unregister(void) {}
  97 #endif
  98 #endif
  99 #endif