af_unix: Move internal definitions to net/unix/.

net/af_unix.h is included by core and some LSMs, but most definitions
need not be.

Let's move struct unix_{vertex,edge} to net/unix/garbage.c and other
definitions to net/unix/af_unix.h.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20250318034934.86708-3-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/af_unix.h

@@ -17,61 +17,17 @@ static inline struct unix_sock *unix_get_socket(struct file *filp)
 }
 #endif
 
-extern unsigned int unix_tot_inflight;
-void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
-void unix_del_edges(struct scm_fp_list *fpl);
-void unix_update_edges(struct unix_sock *receiver);
-int unix_prepare_fpl(struct scm_fp_list *fpl);
-void unix_destroy_fpl(struct scm_fp_list *fpl);
-void unix_gc(void);
-void wait_for_unix_gc(struct scm_fp_list *fpl);
-
-struct unix_vertex {
-	struct list_head edges;
-	struct list_head entry;
-	struct list_head scc_entry;
-	unsigned long out_degree;
-	unsigned long index;
-	unsigned long scc_index;
-};
-
-struct unix_edge {
-	struct unix_sock *predecessor;
-	struct unix_sock *successor;
-	struct list_head vertex_entry;
-	struct list_head stack_entry;
-};
-
-struct sock *unix_peer_get(struct sock *sk);
-
-#define UNIX_HASH_MOD	(256 - 1)
-#define UNIX_HASH_SIZE	(256 * 2)
-#define UNIX_HASH_BITS	8
-
 struct unix_address {
 	refcount_t	refcnt;
 	int		len;
 	struct sockaddr_un name[];
 };
 
-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;
-
 struct scm_stat {
 	atomic_t nr_fds;
 	unsigned long nr_unix_fds;
 };
 
-#define UNIXCB(skb)	(*(struct unix_skb_parms *)&((skb)->cb))
-
 /* The AF_UNIX socket */
 struct unix_sock {
 	/* WARNING: sk has to be the first member */
@@ -84,6 +40,7 @@ struct unix_sock {
 	struct unix_vertex	*vertex;
 	spinlock_t		lock;
 	struct socket_wq	peer_wq;
+#define peer_wait		peer_wq.wait
 	wait_queue_entry_t	peer_wake;
 	struct scm_stat		scm_stat;
 #if IS_ENABLED(CONFIG_AF_UNIX_OOB)
@@ -94,35 +51,4 @@ struct unix_sock {
 #define unix_sk(ptr) container_of_const(ptr, struct unix_sock, sk)
 #define unix_peer(sk) (unix_sk(sk)->peer)
 
-#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
-#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
-
-#define peer_wait peer_wq.wait
-
-long unix_inq_len(struct sock *sk);
-long unix_outq_len(struct sock *sk);
-
-int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
-			 int flags);
-int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
-			  int flags);
-#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
-
-#ifdef CONFIG_BPF_SYSCALL
-extern struct proto unix_dgram_proto;
-extern struct proto unix_stream_proto;
-
-int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
-int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
-void __init unix_bpf_build_proto(void);
-#else
-static inline void __init unix_bpf_build_proto(void)
-{}
-#endif
 #endif

net/unix/af_unix.c

@@ -118,6 +118,8 @@
 #include <net/sock.h>
 #include <net/tcp_states.h>
 
+#include "af_unix.h"
+
 static atomic_long_t unix_nr_socks;
 static struct hlist_head bsd_socket_buckets[UNIX_HASH_SIZE / 2];
 static spinlock_t bsd_socket_locks[UNIX_HASH_SIZE / 2];

net/unix/af_unix.h

@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __AF_UNIX_H
+#define __AF_UNIX_H
+
+#include <linux/uidgid.h>
+
+#define UNIX_HASH_MOD	(256 - 1)
+#define UNIX_HASH_SIZE	(256 * 2)
+#define UNIX_HASH_BITS	8
+
+#define unix_state_lock(s)	spin_lock(&unix_sk(s)->lock)
+#define unix_state_unlock(s)	spin_unlock(&unix_sk(s)->lock)
+
+struct sock *unix_peer_get(struct sock *sk);
+
+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))
+
+/* GC for SCM_RIGHTS */
+extern unsigned int unix_tot_inflight;
+void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
+void unix_del_edges(struct scm_fp_list *fpl);
+void unix_update_edges(struct unix_sock *receiver);
+int unix_prepare_fpl(struct scm_fp_list *fpl);
+void unix_destroy_fpl(struct scm_fp_list *fpl);
+void unix_gc(void);
+void wait_for_unix_gc(struct scm_fp_list *fpl);
+
+/* SOCK_DIAG */
+long unix_inq_len(struct sock *sk);
+long unix_outq_len(struct sock *sk);
+
+/* sysctl */
+#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
+
+/* BPF SOCKMAP */
+int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, int flags);
+int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, int flags);
+
+#ifdef CONFIG_BPF_SYSCALL
+extern struct proto unix_dgram_proto;
+extern struct proto unix_stream_proto;
+
+int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
+int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
+void __init unix_bpf_build_proto(void);
+#else
+static inline void __init unix_bpf_build_proto(void)
+{
+}
+#endif
+
+#endif

net/unix/diag.c

@@ -12,6 +12,8 @@
 #include <net/sock.h>
 #include <net/tcp_states.h>
 
+#include "af_unix.h"
+
 static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
 {
 	/* might or might not have a hash table lock */

net/unix/garbage.c

@@ -80,6 +80,24 @@
 #include <net/sock.h>
 #include <net/tcp_states.h>
 
+#include "af_unix.h"
+
+struct unix_vertex {
+	struct list_head edges;
+	struct list_head entry;
+	struct list_head scc_entry;
+	unsigned long out_degree;
+	unsigned long index;
+	unsigned long scc_index;
+};
+
+struct unix_edge {
+	struct unix_sock *predecessor;
+	struct unix_sock *successor;
+	struct list_head vertex_entry;
+	struct list_head stack_entry;
+};
+
 struct unix_sock *unix_get_socket(struct file *filp)
 {
 	struct inode *inode = file_inode(filp);

net/unix/sysctl_net_unix.c

@@ -10,6 +10,8 @@
 #include <linux/sysctl.h>
 #include <net/af_unix.h>
 
+#include "af_unix.h"
+
 static struct ctl_table unix_table[] = {
 	{
 		.procname	= "max_dgram_qlen",

net/unix/unix_bpf.c

@@ -6,6 +6,8 @@
 #include <net/af_unix.h>
 #include <net/sock.h>
 
+#include "af_unix.h"
+
 #define unix_sk_has_data(__sk, __psock)					\
 		({	!skb_queue_empty(&__sk->sk_receive_queue) ||	\
 			!skb_queue_empty(&__psock->ingress_skb) ||	\