v4.19.13 snapshot.
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
new file mode 100644
index 0000000..a5ba41b
--- /dev/null
+++ b/include/net/af_unix.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_NET_AFUNIX_H
+#define __LINUX_NET_AFUNIX_H
+
+#include <linux/socket.h>
+#include <linux/un.h>
+#include <linux/mutex.h>
+#include <linux/refcount.h>
+#include <net/sock.h>
+
+void unix_inflight(struct user_struct *user, struct file *fp);
+void unix_notinflight(struct user_struct *user, struct file *fp);
+void unix_gc(void);
+void wait_for_unix_gc(void);
+struct sock *unix_get_socket(struct file *filp);
+struct sock *unix_peer_get(struct sock *);
+
+#define UNIX_HASH_SIZE 256
+#define UNIX_HASH_BITS 8
+
+extern unsigned int unix_tot_inflight;
+extern spinlock_t unix_table_lock;
+extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
+
+struct unix_address {
+ refcount_t refcnt;
+ int len;
+ unsigned int hash;
+ struct sockaddr_un name[0];
+};
+
+struct unix_skb_parms {
+ struct pid *pid; /* Skb credentials */
+ kuid_t uid;
+ kgid_t gid;
+ struct scm_fp_list *fp; /* Passed files */
+#ifdef CONFIG_SECURITY_NETWORK
+ u32 secid; /* Security ID */
+#endif
+ u32 consumed;
+} __randomize_layout;
+
+#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
+
+#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
+#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
+#define unix_state_lock_nested(s) \
+ spin_lock_nested(&unix_sk(s)->lock, \
+ SINGLE_DEPTH_NESTING)
+
+/* The AF_UNIX socket */
+struct unix_sock {
+ /* WARNING: sk has to be the first member */
+ struct sock sk;
+ struct unix_address *addr;
+ struct path path;
+ struct mutex iolock, bindlock;
+ struct sock *peer;
+ struct list_head link;
+ atomic_long_t inflight;
+ spinlock_t lock;
+ unsigned long gc_flags;
+#define UNIX_GC_CANDIDATE 0
+#define UNIX_GC_MAYBE_CYCLE 1
+ struct socket_wq peer_wq;
+ wait_queue_entry_t peer_wake;
+};
+
+static inline struct unix_sock *unix_sk(const struct sock *sk)
+{
+ return (struct unix_sock *)sk;
+}
+
+#define peer_wait peer_wq.wait
+
+long unix_inq_len(struct sock *sk);
+long unix_outq_len(struct sock *sk);
+
+#ifdef CONFIG_SYSCTL
+int unix_sysctl_register(struct net *net);
+void unix_sysctl_unregister(struct net *net);
+#else
+static inline int unix_sysctl_register(struct net *net) { return 0; }
+static inline void unix_sysctl_unregister(struct net *net) {}
+#endif
+#endif