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