[S390]: Add AF_IUCV socket support

From: Jennifer Hunt <jenhunt@us.ibm.com>

This patch adds AF_IUCV socket support.

Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/s390/defconfig

@@ -180,6 +180,7 @@ CONFIG_XFRM=y
 # CONFIG_XFRM_SUB_POLICY is not set
 CONFIG_NET_KEY=y
 CONFIG_IUCV=m
+CONFIG_AFIUCV=m
 CONFIG_INET=y
 CONFIG_IP_MULTICAST=y
 # CONFIG_IP_ADVANCED_ROUTER is not set

include/linux/net.h

@@ -24,7 +24,7 @@
 struct poll_table_struct;
 struct inode;
 
-#define NPROTO		32		/* should be enough for now..	*/
+#define NPROTO		33		/* should be enough for now..	*/
 
 #define SYS_SOCKET	1		/* sys_socket(2)		*/
 #define SYS_BIND	2		/* sys_bind(2)			*/

include/linux/socket.h

@@ -187,7 +187,8 @@ struct ucred {
 #define AF_LLC		26	/* Linux LLC			*/
 #define AF_TIPC		30	/* TIPC sockets			*/
 #define AF_BLUETOOTH	31	/* Bluetooth sockets 		*/
-#define AF_MAX		32	/* For now.. */
+#define AF_IUCV		32	/* IUCV sockets			*/
+#define AF_MAX		33	/* For now.. */
 
 /* Protocol families, same as address families. */
 #define PF_UNSPEC	AF_UNSPEC
@@ -220,6 +221,7 @@ struct ucred {
 #define PF_LLC		AF_LLC
 #define PF_TIPC		AF_TIPC
 #define PF_BLUETOOTH	AF_BLUETOOTH
+#define PF_IUCV		AF_IUCV
 #define PF_MAX		AF_MAX
 
 /* Maximum queue length specifiable by listen.  */

include/net/iucv/af_iucv.h

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2006 IBM Corporation
+ * IUCV protocol stack for Linux on zSeries
+ * Version 1.0
+ * Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
+ *
+ */
+
+#ifndef __AFIUCV_H
+#define __AFIUCV_H
+
+#include <asm/types.h>
+#include <asm/byteorder.h>
+#include <linux/list.h>
+#include <linux/poll.h>
+#include <linux/socket.h>
+
+#ifndef AF_IUCV
+#define AF_IUCV		32
+#define PF_IUCV		AF_IUCV
+#endif
+
+/* Connection and socket states */
+enum {
+	IUCV_CONNECTED = 1,
+	IUCV_OPEN,
+	IUCV_BOUND,
+	IUCV_LISTEN,
+	IUCV_SEVERED,
+	IUCV_DISCONN,
+	IUCV_CLOSED
+};
+
+#define IUCV_QUEUELEN_DEFAULT	65535
+#define IUCV_CONN_TIMEOUT	(HZ * 40)
+#define IUCV_DISCONN_TIMEOUT	(HZ * 2)
+#define IUCV_CONN_IDLE_TIMEOUT	(HZ * 60)
+#define IUCV_BUFSIZE_DEFAULT	32768
+
+/* IUCV socket address */
+struct sockaddr_iucv {
+	sa_family_t	siucv_family;
+	unsigned short	siucv_port;		/* Reserved */
+	unsigned int	siucv_addr;		/* Reserved */
+	char		siucv_nodeid[8];	/* Reserved */
+	char		siucv_user_id[8];	/* Guest User Id */
+	char		siucv_name[8];		/* Application Name */
+};
+
+
+/* Common socket structures and functions */
+
+#define iucv_sk(__sk) ((struct iucv_sock *) __sk)
+
+struct iucv_sock {
+	struct sock		sk;
+	char			src_user_id[8];
+	char			src_name[8];
+	char			dst_user_id[8];
+	char			dst_name[8];
+	struct list_head	accept_q;
+	struct sock		*parent;
+	struct iucv_path	*path;
+	struct sk_buff_head	send_skb_q;
+	unsigned int		send_tag;
+};
+
+struct iucv_sock_list {
+	struct hlist_head head;
+	rwlock_t	  lock;
+	atomic_t	  autobind_name;
+};
+
+static void iucv_sock_destruct(struct sock *sk);
+static void iucv_sock_cleanup_listen(struct sock *parent);
+static void iucv_sock_kill(struct sock *sk);
+static void iucv_sock_close(struct sock *sk);
+static int  iucv_sock_create(struct socket *sock, int proto);
+static int  iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
+			int addr_len);
+static int  iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
+			      int alen, int flags);
+static int  iucv_sock_listen(struct socket *sock, int backlog);
+static int  iucv_sock_accept(struct socket *sock, struct socket *newsock,
+			     int flags);
+static int  iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
+			      int *len, int peer);
+static int  iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
+			      struct msghdr *msg, size_t len);
+static int  iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
+			      struct msghdr *msg, size_t len, int flags);
+unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
+			    poll_table *wait);
+static int iucv_sock_release(struct socket *sock);
+static int iucv_sock_shutdown(struct socket *sock, int how);
+
+void iucv_sock_link(struct iucv_sock_list *l, struct sock *s);
+void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *s);
+int  iucv_sock_wait_state(struct sock *sk, int state, int state2,
+			  unsigned long timeo);
+int  iucv_sock_wait_cnt(struct sock *sk, unsigned long timeo);
+void iucv_accept_enqueue(struct sock *parent, struct sock *sk);
+void iucv_accept_unlink(struct sock *sk);
+struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock);
+
+#endif /* __IUCV_H */

net/iucv/Kconfig

@@ -5,3 +5,11 @@ config IUCV
 	  Select this option if you want to use inter-user communication under
 	  VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
 	  communication link between VM guests.
+
+config AFIUCV
+	tristate "AF_IUCV support (VM only)"
+	depends on IUCV
+	help
+	  Select this option if you want to use inter-user communication under
+	  VM or VIF sockets. If you run on z/VM, say "Y" to enable a fast
+	  communication link between VM guests.

net/iucv/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_IUCV)	+= iucv.o
+obj-$(CONFIG_AFIUCV)	+= af_iucv.o