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_destruct_scm(struct sk_buff *skb);
  14void unix_gc(void);
  15void wait_for_unix_gc(void);
  16struct sock *unix_get_socket(struct file *filp);
  17struct sock *unix_peer_get(struct sock *sk);
  18
  19#define UNIX_HASH_SIZE  256
  20#define UNIX_HASH_BITS  8
  21
  22extern unsigned int unix_tot_inflight;
  23extern spinlock_t unix_table_lock;
  24extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
  25
  26struct unix_address {
  27        refcount_t      refcnt;
  28        int             len;
  29        unsigned int    hash;
  30        struct sockaddr_un name[0];
  31};
  32
  33struct 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 */
  53struct 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
  70static 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
  77long unix_inq_len(struct sock *sk);
  78long unix_outq_len(struct sock *sk);
  79
  80#ifdef CONFIG_SYSCTL
  81int unix_sysctl_register(struct net *net);
  82void unix_sysctl_unregister(struct net *net);
  83#else
  84static inline int unix_sysctl_register(struct net *net) { return 0; }
  85static inline void unix_sysctl_unregister(struct net *net) {}
  86#endif
  87#endif
  88