Line data    Source code

       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[];
      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             : struct scm_stat {
      45             :         atomic_t nr_fds;
      46             : };
      47             : 
      48             : #define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
      49             : 
      50             : #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
      51             : #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
      52             : #define unix_state_lock_nested(s) \
      53             :                                 spin_lock_nested(&unix_sk(s)->lock, \
      54             :                                 SINGLE_DEPTH_NESTING)
      55             : 
      56             : /* The AF_UNIX socket */
      57             : struct unix_sock {
      58             :         /* WARNING: sk has to be the first member */
      59             :         struct sock             sk;
      60             :         struct unix_address     *addr;
      61             :         struct path             path;
      62             :         struct mutex            iolock, bindlock;
      63             :         struct sock             *peer;
      64             :         struct list_head        link;
      65             :         atomic_long_t           inflight;
      66             :         spinlock_t              lock;
      67             :         unsigned long           gc_flags;
      68             : #define UNIX_GC_CANDIDATE       0
      69             : #define UNIX_GC_MAYBE_CYCLE     1
      70             :         struct socket_wq        peer_wq;
      71             :         wait_queue_entry_t      peer_wake;
      72             :         struct scm_stat         scm_stat;
      73             : };
      74             : 
      75       38998 : static inline struct unix_sock *unix_sk(const struct sock *sk)
      76             : {
      77       36840 :         return (struct unix_sock *)sk;
      78             : }
      79             : 
      80             : #define peer_wait peer_wq.wait
      81             : 
      82             : long unix_inq_len(struct sock *sk);
      83             : long unix_outq_len(struct sock *sk);
      84             : 
      85             : #ifdef CONFIG_SYSCTL
      86             : int unix_sysctl_register(struct net *net);
      87             : void unix_sysctl_unregister(struct net *net);
      88             : #else
      89             : static inline int unix_sysctl_register(struct net *net) { return 0; }
      90             : static inline void unix_sysctl_unregister(struct net *net) {}
      91             : #endif
      92             : #endif