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 void unix_inflight(struct file *fp);
  10 void unix_notinflight(struct file *fp);
  11 void unix_gc(void);
  12 void wait_for_unix_gc(void);
  13 struct sock *unix_get_socket(struct file *filp);
  14 struct sock *unix_peer_get(struct sock *);
  15
  16 #define UNIX_HASH_SIZE  256
  17 #define UNIX_HASH_BITS  8
  18
  19 extern unsigned int unix_tot_inflight;
  20 extern spinlock_t unix_table_lock;
  21 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
  22
  23 struct unix_address {
  24         atomic_t        refcnt;
  25         int             len;
  26         unsigned int    hash;
  27         struct sockaddr_un name[0];
  28 };
  29
  30 struct unix_skb_parms {
  31         struct pid              *pid;           /* Skb credentials      */
  32         kuid_t                  uid;
  33         kgid_t                  gid;
  34         struct scm_fp_list      *fp;            /* Passed files         */
  35 #ifdef CONFIG_SECURITY_NETWORK
  36         u32                     secid;          /* Security ID          */
  37 #endif
  38         u32                     consumed;
  39 };
  40
  41 #define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
  42 #define UNIXSID(skb)    (&UNIXCB((skb)).secid)
  43
  44 #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  45 #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  46 #define unix_state_lock_nested(s) \
  47                                 spin_lock_nested(&unix_sk(s)->lock, \
  48                                 SINGLE_DEPTH_NESTING)
  49
  50 /* The AF_UNIX socket */
  51 struct unix_sock {
  52         /* WARNING: sk has to be the first member */
  53         struct sock             sk;
  54         struct unix_address     *addr;
  55         struct path             path;
  56         struct mutex            readlock;
  57         struct sock             *peer;
  58         struct list_head        link;
  59         atomic_long_t           inflight;
  60         spinlock_t              lock;
  61         unsigned char           recursion_level;
  62         unsigned long           gc_flags;
  63 #define UNIX_GC_CANDIDATE       0
  64 #define UNIX_GC_MAYBE_CYCLE     1
  65         struct socket_wq        peer_wq;
  66         wait_queue_t            peer_wake;
  67 };
  68
  69 static inline struct unix_sock *unix_sk(struct sock *sk)
  70 {
  71         return (struct unix_sock *)sk;
  72 }
  73
  74 #define peer_wait peer_wq.wait
  75
  76 long unix_inq_len(struct sock *sk);
  77 long unix_outq_len(struct sock *sk);
  78
  79 #ifdef CONFIG_SYSCTL
  80 int unix_sysctl_register(struct net *net);
  81 void unix_sysctl_unregister(struct net *net);
  82 #else
  83 static inline int unix_sysctl_register(struct net *net) { return 0; }
  84 static inline void unix_sysctl_unregister(struct net *net) {}
  85 #endif
  86 #endif