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 #if IS_ENABLED(CONFIG_UNIX)
  12 struct unix_sock *unix_get_socket(struct file *filp);
  13 #else
  14 static inline struct unix_sock *unix_get_socket(struct file *filp)
  15 {
  16         return NULL;
  17 }
  18 #endif
  19
  20 extern unsigned int unix_tot_inflight;
  21 void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
  22 void unix_del_edges(struct scm_fp_list *fpl);
  23 void unix_update_edges(struct unix_sock *receiver);
  24 int unix_prepare_fpl(struct scm_fp_list *fpl);
  25 void unix_destroy_fpl(struct scm_fp_list *fpl);
  26 void unix_gc(void);
  27 void wait_for_unix_gc(struct scm_fp_list *fpl);
  28
  29 struct unix_vertex {
  30         struct list_head edges;
  31         struct list_head entry;
  32         struct list_head scc_entry;
  33         unsigned long out_degree;
  34         unsigned long index;
  35         unsigned long scc_index;
  36 };
  37
  38 struct unix_edge {
  39         struct unix_sock *predecessor;
  40         struct unix_sock *successor;
  41         struct list_head vertex_entry;
  42         struct list_head stack_entry;
  43 };
  44
  45 struct sock *unix_peer_get(struct sock *sk);
  46
  47 #define UNIX_HASH_MOD   (256 - 1)
  48 #define UNIX_HASH_SIZE  (256 * 2)
  49 #define UNIX_HASH_BITS  8
  50
  51 struct unix_address {
  52         refcount_t      refcnt;
  53         int             len;
  54         struct sockaddr_un name[];
  55 };
  56
  57 struct unix_skb_parms {
  58         struct pid              *pid;           /* Skb credentials      */
  59         kuid_t                  uid;
  60         kgid_t                  gid;
  61         struct scm_fp_list      *fp;            /* Passed files         */
  62 #ifdef CONFIG_SECURITY_NETWORK
  63         u32                     secid;          /* Security ID          */
  64 #endif
  65         u32                     consumed;
  66 } __randomize_layout;
  67
  68 struct scm_stat {
  69         atomic_t nr_fds;
  70         unsigned long nr_unix_fds;
  71 };
  72
  73 #define UNIXCB(skb)     (*(struct unix_skb_parms *)&((skb)->cb))
  74
  75 /* The AF_UNIX socket */
  76 struct unix_sock {
  77         /* WARNING: sk has to be the first member */
  78         struct sock             sk;
  79         struct unix_address     *addr;
  80         struct path             path;
  81         struct mutex            iolock, bindlock;
  82         struct sock             *peer;
  83         struct sock             *listener;
  84         struct unix_vertex      *vertex;
  85         spinlock_t              lock;
  86         struct socket_wq        peer_wq;
  87         wait_queue_entry_t      peer_wake;
  88         struct scm_stat         scm_stat;
  89 #if IS_ENABLED(CONFIG_AF_UNIX_OOB)
  90         struct sk_buff          *oob_skb;
  91 #endif
  92 };
  93
  94 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
  95 #define unix_peer(sk) (unix_sk(sk)->peer)
  96
  97 #define unix_state_lock(s)      spin_lock(&unix_sk(s)->lock)
  98 #define unix_state_unlock(s)    spin_unlock(&unix_sk(s)->lock)
  99
 100 #define peer_wait peer_wq.wait
 101
 102 long unix_inq_len(struct sock *sk);
 103 long unix_outq_len(struct sock *sk);
 104
 105 int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
 106                          int flags);
 107 int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
 108                           int flags);
 109 #ifdef CONFIG_SYSCTL
 110 int unix_sysctl_register(struct net *net);
 111 void unix_sysctl_unregister(struct net *net);
 112 #else
 113 static inline int unix_sysctl_register(struct net *net) { return 0; }
 114 static inline void unix_sysctl_unregister(struct net *net) {}
 115 #endif
 116
 117 #ifdef CONFIG_BPF_SYSCALL
 118 extern struct proto unix_dgram_proto;
 119 extern struct proto unix_stream_proto;
 120
 121 int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
 122 int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
 123 void __init unix_bpf_build_proto(void);
 124 #else
 125 static inline void __init unix_bpf_build_proto(void)
 126 {}
 127 #endif
 128 #endif