include/net/af_unix.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_NET_AFUNIX_H
   3 #define __LINUX_NET_AFUNIX_H
   4
   5 #include <linux/socket.h>
   6 #include <linux/un.h>
   7 #include <linux/mutex.h>
   8 #include <linux/refcount.h>
   9 #include <net/sock.h>
  10
  11 void unix_inflight(struct user_struct *user, struct file *fp);
  12 void unix_notinflight(struct user_struct *user, struct file *fp);
  13 void unix_gc(void);
  14 void wait_for_unix_gc(void);
  15 struct sock *unix_get_socket(struct file *filp);
  16 struct sock *unix_peer_get(struct sock *);
  17
  18 #define UNIX_HASH_SIZE  256
  19 #define UNIX_HASH_BITS  8
  20
  21 extern unsigned int unix_tot_inflight;
  22 extern spinlock_t unix_table_lock;
  23 extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
  24
  25 struct unix_address {
  26         refcount_t      refcnt;
  27         int             len;
  28         unsigned int    hash;
  29         struct sockaddr_un name[0];
  30 };
  31
  32 struct unix_skb_parms {
  33         struct pid              *pid;           /* Skb credentials      */
  34         kuid_t                  uid;
  35         kgid_t                  gid;
  36         struct scm_fp_list      *fp;            /* Passed files         */
  37 #ifdef CONFIG_SECURITY_NETWORK
  38         u32                     secid;          /* Security ID          */
  39 #endif
  40         u32                     consumed;
  41 } __randomize_layout;
  42
  43 #define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
  44
  45 #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  46 #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  47 #define unix_state_lock_nested(s) \
  48                                 spin_lock_nested(&unix_sk(s)->lock, \
  49                                 SINGLE_DEPTH_NESTING)
  50
  51 /* The AF_UNIX socket */
  52 struct unix_sock {
  53         /* WARNING: sk has to be the first member */
  54         struct sock             sk;
  55         struct unix_address     *addr;
  56         struct path             path;
  57         struct mutex            iolock, bindlock;
  58         struct sock             *peer;
  59         struct list_head        link;
  60         atomic_long_t           inflight;
  61         spinlock_t              lock;
  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_entry_t              peer_wake;
  67 };
  68
  69 static inline struct unix_sock *unix_sk(const 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