LXR linux/include/net/af

   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
   9void unix_inflight(struct user_struct *user, struct file *fp);
  10void unix_notinflight(struct user_struct *user, struct file *fp);
  11void unix_gc(void);
  12void wait_for_unix_gc(void);
  13struct sock *unix_get_socket(struct file *filp);
  14struct sock *unix_peer_get(struct sock *);
  15
  16#define UNIX_HASH_SIZE  256
  17#define UNIX_HASH_BITS  8
  18
  19extern unsigned int unix_tot_inflight;
  20extern spinlock_t unix_table_lock;
  21extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
  22
  23struct unix_address {
  24        atomic_t        refcnt;
  25        int             len;
  26        unsigned int    hash;
  27        struct sockaddr_un name[0];
  28};
  29
  30struct 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
  43#define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  44#define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  45#define unix_state_lock_nested(s) \
  46                                spin_lock_nested(&unix_sk(s)->lock, \
  47                                SINGLE_DEPTH_NESTING)
  48
  49/* The AF_UNIX socket */
  50struct unix_sock {
  51        /* WARNING: sk has to be the first member */
  52        struct sock             sk;
  53        struct unix_address     *addr;
  54        struct path             path;
  55        struct mutex            readlock;
  56        struct sock             *peer;
  57        struct list_head        link;
  58        atomic_long_t           inflight;
  59        spinlock_t              lock;
  60        unsigned char           recursion_level;
  61        unsigned long           gc_flags;
  62#define UNIX_GC_CANDIDATE       0
  63#define UNIX_GC_MAYBE_CYCLE     1
  64        struct socket_wq        peer_wq;
  65        wait_queue_t            peer_wake;
  66};
  67
  68static inline struct unix_sock *unix_sk(const struct sock *sk)
  69{
  70        return (struct unix_sock *)sk;
  71}
  72
  73#define peer_wait peer_wq.wait
  74
  75long unix_inq_len(struct sock *sk);
  76long unix_outq_len(struct sock *sk);
  77
  78#ifdef CONFIG_SYSCTL
  79int unix_sysctl_register(struct net *net);
  80void unix_sysctl_unregister(struct net *net);
  81#else
  82static inline int unix_sysctl_register(struct net *net) { return 0; }
  83static inline void unix_sysctl_unregister(struct net *net) {}
  84#endif
  85#endif
  86