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