LXR linux/include/net/af

   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
  11void unix_inflight(struct user_struct *user, struct file *fp);
  12void unix_notinflight(struct user_struct *user, struct file *fp);
  13void unix_gc(void);
  14void wait_for_unix_gc(void);
  15struct sock *unix_get_socket(struct file *filp);
  16struct sock *unix_peer_get(struct sock *);
  17
  18#define UNIX_HASH_SIZE  256
  19#define UNIX_HASH_BITS  8
  20
  21extern unsigned int unix_tot_inflight;
  22extern spinlock_t unix_table_lock;
  23extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
  24
  25struct unix_address {
  26        refcount_t      refcnt;
  27        int             len;
  28        unsigned int    hash;
  29        struct sockaddr_un name[0];
  30};
  31
  32struct 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 */
  52struct 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
  69static 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
  76long unix_inq_len(struct sock *sk);
  77long unix_outq_len(struct sock *sk);
  78
  79#ifdef CONFIG_SYSCTL
  80int unix_sysctl_register(struct net *net);
  81void unix_sysctl_unregister(struct net *net);
  82#else
  83static inline int unix_sysctl_register(struct net *net) { return 0; }
  84static inline void unix_sysctl_unregister(struct net *net) {}
  85#endif
  86#endif
  87