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[];
  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
  44struct 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 */
  57struct 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#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
  74        struct sk_buff          *oob_skb;
  75#endif
  76};
  77
  78static inline struct unix_sock *unix_sk(const struct sock *sk)
  79{
  80        return (struct unix_sock *)sk;
  81}
  82
  83#define peer_wait peer_wq.wait
  84
  85long unix_inq_len(struct sock *sk);
  86long unix_outq_len(struct sock *sk);
  87
  88int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
  89                         int flags);
  90int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
  91                          int flags);
  92#ifdef CONFIG_SYSCTL
  93int unix_sysctl_register(struct net *net);
  94void unix_sysctl_unregister(struct net *net);
  95#else
  96static inline int unix_sysctl_register(struct net *net) { return 0; }
  97static inline void unix_sysctl_unregister(struct net *net) {}
  98#endif
  99
 100#ifdef CONFIG_BPF_SYSCALL
 101extern struct proto unix_dgram_proto;
 102extern struct proto unix_stream_proto;
 103
 104int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
 105int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
 106void __init unix_bpf_build_proto(void);
 107#else
 108static inline void __init unix_bpf_build_proto(void)
 109{}
 110#endif
 111#endif
 112