Add SP socket stub

This builds, but does absolutely nothing.

Signed-off-by: Martin Lucina <mato@kotelna.sk>

include/linux/socket.h

@@ -193,7 +193,8 @@ struct ucred {
 #define AF_PHONET	35	/* Phonet sockets		*/
 #define AF_IEEE802154	36	/* IEEE802154 sockets		*/
 #define AF_CAIF		37	/* CAIF sockets			*/
-#define AF_MAX		38	/* For now.. */
+#define AF_SP		38	/* SP sockets			*/
+#define AF_MAX		39	/* For now.. */
 
 /* Protocol families, same as address families. */
 #define PF_UNSPEC	AF_UNSPEC
@@ -235,6 +236,7 @@ struct ucred {
 #define PF_IEEE802154	AF_IEEE802154
 #define PF_CAIF		AF_CAIF
 #define PF_MAX		AF_MAX
+#define PF_SP		AF_SP
 
 /* Maximum queue length specifiable by listen.  */
 #define SOMAXCONN	128

include/linux/sp.h

@@ -0,0 +1,11 @@
+#ifndef _LINUX_SP_H
+#define _LINUX_SP_H
+
+#define SP_ADDRESS_MAX	108
+
+struct sockaddr_sp {
+        sa_family_t ssp_family;                 /* AF_SP */
+        char ssp_endpoint[SP_ADDRESS_MAX];      /* Endpoint */
+};
+
+#endif /* _LINUX_SP_H */

include/net/af_sp.h

@@ -0,0 +1,16 @@
+#ifndef __LINUX_NET_AFSP_H
+#define __LINUX_NET_AFSP_H
+
+#include <linux/socket.h>
+#include <linux/sp.h>
+#include <net/sock.h>
+
+#ifdef __KERNEL__
+/* The AF_SP socket */
+struct sp_sock {
+        /* WARNING: sk has to be the first member */
+        struct sock	sk;
+};
+#endif
+
+#endif

net/Kconfig

@@ -47,6 +47,7 @@ menu "Networking options"
 
 source "net/packet/Kconfig"
 source "net/unix/Kconfig"
+source "net/sp/Kconfig"
 source "net/xfrm/Kconfig"
 source "net/iucv/Kconfig"
 

net/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_NETFILTER)		+= netfilter/
 obj-$(CONFIG_INET)		+= ipv4/
 obj-$(CONFIG_XFRM)		+= xfrm/
 obj-$(CONFIG_UNIX)		+= unix/
+obj-$(CONFIG_SP)		+= sp/
 ifneq ($(CONFIG_IPV6),)
 obj-y				+= ipv6/
 endif

net/sp/Kconfig

@@ -0,0 +1,8 @@
+#
+# SP Domain Sockets
+#
+
+config SP
+	tristate "SP domain sockets"
+	---help---
+	  Magic.

net/sp/Makefile

@@ -0,0 +1,7 @@
+#
+# Makefile for the SP socket layer.
+#
+
+obj-$(CONFIG_SP)	+= sp.o
+
+sp-y			:= af_sp.o

net/sp/af_sp.c

@@ -0,0 +1,86 @@
+/*
+ * SP: An implementation of SP sockets.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <linux/sp.h>
+#include <net/af_sp.h>
+
+static int sp_release(struct socket *);
+static int sp_create(struct net *, struct socket *, int, int);
+
+static const struct proto_ops sp_ops = {
+        .family =	PF_SP,
+	.owner =	THIS_MODULE,
+	.release =	sp_release,
+	.bind =		sock_no_bind,
+	.connect =	sock_no_connect,
+	.socketpair =	sock_no_socketpair,
+	.accept =	sock_no_accept,
+	.getname =	sock_no_getname,
+	.poll =		sock_no_poll,
+	.ioctl =	sock_no_ioctl,
+	.listen =	sock_no_listen,
+	.shutdown =	sock_no_shutdown,
+	.setsockopt =	sock_no_setsockopt,
+	.getsockopt =	sock_no_getsockopt,
+	.sendmsg =	sock_no_sendmsg,
+	.recvmsg =	sock_no_recvmsg,
+	.mmap =		sock_no_mmap,
+	.sendpage =	sock_no_sendpage,
+};
+
+static struct proto sp_proto = {
+	.name =		"SP",
+	.owner =	THIS_MODULE,
+	.obj_size =	sizeof(struct sp_sock),
+};
+
+static int sp_release(struct socket *sock)
+{
+	return 0;
+}
+
+static int sp_create(struct net *net, struct socket *sock, int protocol,
+                     int kern)
+{
+	sock->ops = &sp_ops;
+
+	return -ESOCKTNOSUPPORT;
+}
+
+static const struct net_proto_family sp_family_ops = {
+	.family =	PF_SP,
+	.create =	sp_create,
+	.owner =	THIS_MODULE,
+};
+
+static int __init af_sp_init(void)
+{
+	int rc = -1;
+
+	rc = proto_register(&sp_proto, 1);
+	if (rc != 0) {
+		printk(KERN_CRIT "%s: Cannot create sp_sock SLAB cache!\n",
+		       __func__);
+        	goto out;
+	}
+
+	sock_register(&sp_family_ops);
+out:
+	return rc;
+}
+
+static void __exit af_sp_exit(void)
+{
+	sock_unregister(PF_SP);
+	proto_unregister(&sp_proto);
+}
+
+fs_initcall(af_sp_init);
+module_exit(af_sp_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_SP);