linux/include/net/af_unix.h
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   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
   9extern void unix_inflight(struct file *fp);
  10extern void unix_notinflight(struct file *fp);
  11extern void unix_gc(void);
  12extern void wait_for_unix_gc(void);
  13extern struct sock *unix_get_socket(struct file *filp);
  14extern struct 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        const struct cred       *cred;
  33        struct scm_fp_list      *fp;            /* Passed files         */
  34#ifdef CONFIG_SECURITY_NETWORK
  35        u32                     secid;          /* Security ID          */
  36#endif
  37};
  38
  39#define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
  40#define UNIXSID(skb)    (&UNIXCB((skb)).secid)
  41
  42#define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  43#define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  44#define unix_state_lock_nested(s) \
  45                                spin_lock_nested(&unix_sk(s)->lock, \
  46                                SINGLE_DEPTH_NESTING)
  47
  48/* The AF_UNIX socket */
  49struct unix_sock {
  50        /* WARNING: sk has to be the first member */
  51        struct sock             sk;
  52        struct unix_address     *addr;
  53        struct path             path;
  54        struct mutex            readlock;
  55        struct sock             *peer;
  56        struct sock             *other;
  57        struct list_head        link;
  58        atomic_long_t           inflight;
  59        spinlock_t              lock;
  60        unsigned int            gc_candidate : 1;
  61        unsigned int            gc_maybe_cycle : 1;
  62        unsigned char           recursion_level;
  63        struct socket_wq        peer_wq;
  64};
  65#define unix_sk(__sk) ((struct unix_sock *)__sk)
  66
  67#define peer_wait peer_wq.wait
  68
  69long unix_inq_len(struct sock *sk);
  70long unix_outq_len(struct sock *sk);
  71
  72#ifdef CONFIG_SYSCTL
  73extern int unix_sysctl_register(struct net *net);
  74extern void unix_sysctl_unregister(struct net *net);
  75#else
  76static inline int unix_sysctl_register(struct net *net) { return 0; }
  77static inline void unix_sysctl_unregister(struct net *net) {}
  78#endif
  79#endif
  80
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