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 extern void wait_for_unix_gc(void);
  13 extern struct sock *unix_get_socket(struct file *filp);
  14
  15 #define UNIX_HASH_SIZE  256
  16
  17 extern unsigned int unix_tot_inflight;
  18
  19 struct unix_address {
  20         atomic_t        refcnt;
  21         int             len;
  22         unsigned        hash;
  23         struct sockaddr_un name[0];
  24 };
  25
  26 struct unix_skb_parms {
  27         struct pid              *pid;           /* Skb credentials      */
  28         const struct cred       *cred;
  29         struct scm_fp_list      *fp;            /* Passed files         */
  30 #ifdef CONFIG_SECURITY_NETWORK
  31         u32                     secid;          /* Security ID          */
  32 #endif
  33 };
  34
  35 #define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
  36 #define UNIXSID(skb)    (&UNIXCB((skb)).secid)
  37
  38 #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  39 #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  40 #define unix_state_lock_nested(s) \
  41                                 spin_lock_nested(&unix_sk(s)->lock, \
  42                                 SINGLE_DEPTH_NESTING)
  43
  44 /* The AF_UNIX socket */
  45 struct unix_sock {
  46         /* WARNING: sk has to be the first member */
  47         struct sock             sk;
  48         struct unix_address     *addr;
  49         struct dentry           *dentry;
  50         struct vfsmount         *mnt;
  51         struct mutex            readlock;
  52         struct sock             *peer;
  53         struct sock             *other;
  54         struct list_head        link;
  55         atomic_long_t           inflight;
  56         spinlock_t              lock;
  57         unsigned int            gc_candidate : 1;
  58         unsigned int            gc_maybe_cycle : 1;
  59         unsigned char           recursion_level;
  60         struct socket_wq        peer_wq;
  61 };
  62 #define unix_sk(__sk) ((struct unix_sock *)__sk)
  63
  64 #define peer_wait peer_wq.wait
  65
  66 #ifdef CONFIG_SYSCTL
  67 extern int unix_sysctl_register(struct net *net);
  68 extern void unix_sysctl_unregister(struct net *net);
  69 #else
  70 static inline int unix_sysctl_register(struct net *net) { return 0; }
  71 static inline void unix_sysctl_unregister(struct net *net) {}
  72 #endif
  73 #endif