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