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
  14 #define UNIX_HASH_SIZE  256
  15
  16 extern unsigned int unix_tot_inflight;
  17
  18 struct unix_address {
  19         atomic_t        refcnt;
  20         int             len;
  21         unsigned        hash;
  22         struct sockaddr_un name[0];
  23 };
  24
  25 struct unix_skb_parms {
  26         struct ucred            creds;          /* Skb credentials      */
  27         struct scm_fp_list      *fp;            /* Passed files         */
  28 #ifdef CONFIG_SECURITY_NETWORK
  29         u32                     secid;          /* Security ID          */
  30 #endif
  31 };
  32
  33 #define UNIXCB(skb)     (*(struct unix_skb_parms*)&((skb)->cb))
  34 #define UNIXCREDS(skb)  (&UNIXCB((skb)).creds)
  35 #define UNIXSID(skb)    (&UNIXCB((skb)).secid)
  36
  37 #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  38 #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  39 #define unix_state_lock_nested(s) \
  40                                 spin_lock_nested(&unix_sk(s)->lock, \
  41                                 SINGLE_DEPTH_NESTING)
  42
  43 #ifdef __KERNEL__
  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         wait_queue_head_t       peer_wait;
  60 };
  61 #define unix_sk(__sk) ((struct unix_sock *)__sk)
  62
  63 #ifdef CONFIG_SYSCTL
  64 extern int unix_sysctl_register(struct net *net);
  65 extern void unix_sysctl_unregister(struct net *net);
  66 #else
  67 static inline int unix_sysctl_register(struct net *net) { return 0; }
  68 static inline void unix_sysctl_unregister(struct net *net) {}
  69 #endif
  70 #endif
  71 #endif