Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2405 insertions, 0 deletions

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
new file mode 100644
index 000000000000..29bb3cd21965
--- /dev/null
+++ b/net/decnet/af_decnet.c
@@ -0,0 +1,2405 @@
+
+/*
+ * DECnet       An implementation of the DECnet protocol suite for the LINUX
+ *              operating system.  DECnet is implemented using the  BSD Socket
+ *              interface as the means of communication with the user level.
+ *
+ *              DECnet Socket Layer Interface
+ *
+ * Authors:     Eduardo Marcelo Serrat <emserrat@geocities.com>
+ *              Patrick Caulfield <patrick@pandh.demon.co.uk>
+ *
+ * Changes:
+ *        Steve Whitehouse: Copied from Eduardo Serrat and Patrick Caulfield's
+ *                          version of the code. Original copyright preserved
+ *                          below.
+ *        Steve Whitehouse: Some bug fixes, cleaning up some code to make it
+ *                          compatible with my routing layer.
+ *        Steve Whitehouse: Merging changes from Eduardo Serrat and Patrick
+ *                          Caulfield.
+ *        Steve Whitehouse: Further bug fixes, checking module code still works
+ *                          with new routing layer.
+ *        Steve Whitehouse: Additional set/get_sockopt() calls.
+ *        Steve Whitehouse: Fixed TIOCINQ ioctl to be same as Eduardo's new
+ *                          code.
+ *        Steve Whitehouse: recvmsg() changed to try and behave in a POSIX like
+ *                          way. Didn't manage it entirely, but its better.
+ *        Steve Whitehouse: ditto for sendmsg().
+ *        Steve Whitehouse: A selection of bug fixes to various things.
+ *        Steve Whitehouse: Added TIOCOUTQ ioctl.
+ *        Steve Whitehouse: Fixes to username2sockaddr & sockaddr2username.
+ *        Steve Whitehouse: Fixes to connect() error returns.
+ *       Patrick Caulfield: Fixes to delayed acceptance logic.
+ *         David S. Miller: New socket locking
+ *        Steve Whitehouse: Socket list hashing/locking
+ *         Arnaldo C. Melo: use capable, not suser
+ *        Steve Whitehouse: Removed unused code. Fix to use sk->allocation
+ *                          when required.
+ *       Patrick Caulfield: /proc/net/decnet now has object name/number
+ *        Steve Whitehouse: Fixed local port allocation, hashed sk list
+ *          Matthew Wilcox: Fixes for dn_ioctl()
+ *        Steve Whitehouse: New connect/accept logic to allow timeouts and
+ *                          prepare for sendpage etc.
+ */
+
+
+/******************************************************************************
+    (c) 1995-1998 E.M. Serrat		emserrat@geocities.com
+    
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+HISTORY:
+
+Version           Kernel     Date       Author/Comments
+-------           ------     ----       ---------------
+Version 0.0.1     2.0.30    01-dic-97	Eduardo Marcelo Serrat
+					(emserrat@geocities.com)
+
+                                        First Development of DECnet Socket La-
+					yer for Linux. Only supports outgoing
+					connections.
+
+Version 0.0.2	  2.1.105   20-jun-98   Patrick J. Caulfield
+					(patrick@pandh.demon.co.uk)
+
+					Port to new kernel development version.
+
+Version 0.0.3     2.1.106   25-jun-98   Eduardo Marcelo Serrat
+					(emserrat@geocities.com)
+					_
+                                        Added support for incoming connections
+                                        so we can start developing server apps
+                                        on Linux.
+					-
+					Module Support
+Version 0.0.4     2.1.109   21-jul-98   Eduardo Marcelo Serrat
+                                       (emserrat@geocities.com)
+                                       _
+                                        Added support for X11R6.4. Now we can 
+                                        use DECnet transport for X on Linux!!!
+                                       -
+Version 0.0.5    2.1.110   01-aug-98   Eduardo Marcelo Serrat
+                                       (emserrat@geocities.com)
+                                       Removed bugs on flow control
+                                       Removed bugs on incoming accessdata
+                                       order
+                                       -
+Version 0.0.6    2.1.110   07-aug-98   Eduardo Marcelo Serrat
+                                       dn_recvmsg fixes
+
+                                        Patrick J. Caulfield
+                                       dn_bind fixes
+*******************************************************************************/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/inet.h>
+#include <linux/route.h>
+#include <linux/netfilter.h>
+#include <linux/seq_file.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <net/flow.h>
+#include <asm/system.h>
+#include <asm/ioctls.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/dn.h>
+#include <net/dn_nsp.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+
+struct dn_sock {
+	struct sock sk;
+	struct dn_scp scp;
+};
+
+static void dn_keepalive(struct sock *sk);
+
+#define DN_SK_HASH_SHIFT 8
+#define DN_SK_HASH_SIZE (1 << DN_SK_HASH_SHIFT)
+#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
+
+
+static struct proto_ops dn_proto_ops;
+static DEFINE_RWLOCK(dn_hash_lock);
+static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
+static struct hlist_head dn_wild_sk;
+
+static int __dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen, int flags);
+static int __dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen, int flags);
+
+static struct hlist_head *dn_find_list(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+
+	if (scp->addr.sdn_flags & SDF_WILD)
+		return hlist_empty(&dn_wild_sk) ? &dn_wild_sk : NULL;
+
+	return &dn_sk_hash[scp->addrloc & DN_SK_HASH_MASK];
+}
+
+/* 
+ * Valid ports are those greater than zero and not already in use.
+ */
+static int check_port(unsigned short port)
+{
+	struct sock *sk;
+	struct hlist_node *node;
+
+	if (port == 0)
+		return -1;
+
+	sk_for_each(sk, node, &dn_sk_hash[port & DN_SK_HASH_MASK]) {
+		struct dn_scp *scp = DN_SK(sk);
+		if (scp->addrloc == port)
+			return -1;
+	}
+	return 0;
+}
+
+static unsigned short port_alloc(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+static unsigned short port = 0x2000;
+	unsigned short i_port = port;
+
+	while(check_port(++port) != 0) {
+		if (port == i_port)
+			return 0;
+	}
+
+	scp->addrloc = port;
+
+	return 1;
+}
+
+/*
+ * Since this is only ever called from user
+ * level, we don't need a write_lock() version
+ * of this.
+ */
+static int dn_hash_sock(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+	struct hlist_head *list;
+	int rv = -EUSERS;
+
+	BUG_ON(sk_hashed(sk));
+
+	write_lock_bh(&dn_hash_lock);
+	
+	if (!scp->addrloc && !port_alloc(sk))
+		goto out;
+
+	rv = -EADDRINUSE;
+	if ((list = dn_find_list(sk)) == NULL)
+		goto out;
+
+	sk_add_node(sk, list);
+	rv = 0;
+out:
+	write_unlock_bh(&dn_hash_lock);
+	return rv;
+}
+
+static void dn_unhash_sock(struct sock *sk)
+{
+	write_lock(&dn_hash_lock);
+	sk_del_node_init(sk);
+	write_unlock(&dn_hash_lock);
+}
+
+static void dn_unhash_sock_bh(struct sock *sk)
+{
+	write_lock_bh(&dn_hash_lock);
+	sk_del_node_init(sk);
+	write_unlock_bh(&dn_hash_lock);
+}
+
+static struct hlist_head *listen_hash(struct sockaddr_dn *addr)
+{
+	int i;
+	unsigned hash = addr->sdn_objnum;
+
+	if (hash == 0) {
+		hash = addr->sdn_objnamel;
+		for(i = 0; i < dn_ntohs(addr->sdn_objnamel); i++) {
+			hash ^= addr->sdn_objname[i];
+			hash ^= (hash << 3);
+		}
+	}
+
+	return &dn_sk_hash[hash & DN_SK_HASH_MASK];
+}
+
+/*
+ * Called to transform a socket from bound (i.e. with a local address)
+ * into a listening socket (doesn't need a local port number) and rehashes
+ * based upon the object name/number.
+ */
+static void dn_rehash_sock(struct sock *sk)
+{
+	struct hlist_head *list;
+	struct dn_scp *scp = DN_SK(sk);
+
+	if (scp->addr.sdn_flags & SDF_WILD)
+		return;
+
+	write_lock_bh(&dn_hash_lock);
+	sk_del_node_init(sk);
+	DN_SK(sk)->addrloc = 0;
+	list = listen_hash(&DN_SK(sk)->addr);
+	sk_add_node(sk, list);
+	write_unlock_bh(&dn_hash_lock);
+}
+
+int dn_sockaddr2username(struct sockaddr_dn *sdn, unsigned char *buf, unsigned char type)
+{
+	int len = 2;
+
+	*buf++ = type;
+
+	switch(type) {
+		case 0:
+			*buf++ = sdn->sdn_objnum;
+			break;
+		case 1:
+			*buf++ = 0;
+			*buf++ = dn_ntohs(sdn->sdn_objnamel);
+			memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
+			len = 3 + dn_ntohs(sdn->sdn_objnamel);
+			break;
+		case 2:
+			memset(buf, 0, 5);
+			buf += 5;
+			*buf++ = dn_ntohs(sdn->sdn_objnamel);
+			memcpy(buf, sdn->sdn_objname, dn_ntohs(sdn->sdn_objnamel));
+			len = 7 + dn_ntohs(sdn->sdn_objnamel);
+			break;
+	}
+
+	return len;
+}
+
+/*
+ * On reception of usernames, we handle types 1 and 0 for destination
+ * addresses only. Types 2 and 4 are used for source addresses, but the
+ * UIC, GIC are ignored and they are both treated the same way. Type 3
+ * is never used as I've no idea what its purpose might be or what its
+ * format is.
+ */
+int dn_username2sockaddr(unsigned char *data, int len, struct sockaddr_dn *sdn, unsigned char *fmt)
+{
+	unsigned char type;
+	int size = len;
+	int namel = 12;
+
+	sdn->sdn_objnum = 0;
+	sdn->sdn_objnamel = dn_htons(0);
+	memset(sdn->sdn_objname, 0, DN_MAXOBJL);
+
+	if (len < 2)
+		return -1;
+
+	len -= 2;
+	*fmt = *data++;
+	type = *data++;
+
+	switch(*fmt) {
+		case 0:
+			sdn->sdn_objnum = type;
+			return 2;
+		case 1:
+			namel = 16;
+			break;
+		case 2:
+			len  -= 4;
+			data += 4;
+			break;
+		case 4:
+			len  -= 8;
+			data += 8;
+			break;
+		default:
+			return -1;
+	}
+
+	len -= 1;
+
+	if (len < 0)
+		return -1;
+
+	sdn->sdn_objnamel = dn_htons(*data++);
+	len -= dn_ntohs(sdn->sdn_objnamel);
+
+	if ((len < 0) || (dn_ntohs(sdn->sdn_objnamel) > namel))
+		return -1;
+
+	memcpy(sdn->sdn_objname, data, dn_ntohs(sdn->sdn_objnamel));
+
+	return size - len;
+}
+
+struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
+{
+	struct hlist_head *list = listen_hash(addr);
+	struct hlist_node *node;
+	struct sock *sk;
+
+	read_lock(&dn_hash_lock);
+	sk_for_each(sk, node, list) {
+		struct dn_scp *scp = DN_SK(sk);
+		if (sk->sk_state != TCP_LISTEN)
+			continue;
+		if (scp->addr.sdn_objnum) {
+			if (scp->addr.sdn_objnum != addr->sdn_objnum)
+				continue;
+		} else {
+			if (addr->sdn_objnum)
+				continue;
+			if (scp->addr.sdn_objnamel != addr->sdn_objnamel)
+				continue;
+			if (memcmp(scp->addr.sdn_objname, addr->sdn_objname, dn_ntohs(addr->sdn_objnamel)) != 0)
+				continue;
+		}
+		sock_hold(sk);
+		read_unlock(&dn_hash_lock);
+		return sk;
+	}
+
+	sk = sk_head(&dn_wild_sk);
+	if (sk) {
+	       	if (sk->sk_state == TCP_LISTEN)
+			sock_hold(sk);
+		else
+			sk = NULL;
+	}
+
+	read_unlock(&dn_hash_lock);
+	return sk;
+}
+
+struct sock *dn_find_by_skb(struct sk_buff *skb)
+{
+	struct dn_skb_cb *cb = DN_SKB_CB(skb);
+	struct sock *sk;
+	struct hlist_node *node;
+	struct dn_scp *scp;
+
+	read_lock(&dn_hash_lock);
+	sk_for_each(sk, node, &dn_sk_hash[cb->dst_port & DN_SK_HASH_MASK]) {
+		scp = DN_SK(sk);
+		if (cb->src != dn_saddr2dn(&scp->peer))
+			continue;
+		if (cb->dst_port != scp->addrloc)
+			continue;
+		if (scp->addrrem && (cb->src_port != scp->addrrem))
+			continue;
+		sock_hold(sk);
+		goto found;
+	}
+	sk = NULL;
+found:
+	read_unlock(&dn_hash_lock);
+	return sk;
+}
+
+
+
+static void dn_destruct(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+
+	skb_queue_purge(&scp->data_xmit_queue);
+	skb_queue_purge(&scp->other_xmit_queue);
+	skb_queue_purge(&scp->other_receive_queue);
+
+	dst_release(xchg(&sk->sk_dst_cache, NULL));
+}
+
+static struct proto dn_proto = {
+	.name	  = "DECNET",
+	.owner	  = THIS_MODULE,
+	.obj_size = sizeof(struct dn_sock),
+};
+
+static struct sock *dn_alloc_sock(struct socket *sock, int gfp)
+{
+	struct dn_scp *scp;
+	struct sock *sk = sk_alloc(PF_DECnet, gfp, &dn_proto, 1);
+
+	if  (!sk)
+		goto out;
+
+	if (sock)
+		sock->ops = &dn_proto_ops;
+	sock_init_data(sock, sk);
+
+	sk->sk_backlog_rcv = dn_nsp_backlog_rcv;
+	sk->sk_destruct    = dn_destruct;
+	sk->sk_no_check    = 1;
+	sk->sk_family      = PF_DECnet;
+	sk->sk_protocol    = 0;
+	sk->sk_allocation  = gfp;
+
+	/* Initialization of DECnet Session Control Port		*/
+	scp = DN_SK(sk);
+	scp->state	= DN_O;		/* Open			*/
+	scp->numdat	= 1;		/* Next data seg to tx	*/
+	scp->numoth	= 1;		/* Next oth data to tx  */
+	scp->ackxmt_dat = 0;		/* Last data seg ack'ed */
+	scp->ackxmt_oth = 0;		/* Last oth data ack'ed */
+	scp->ackrcv_dat = 0;		/* Highest data ack recv*/
+	scp->ackrcv_oth = 0;		/* Last oth data ack rec*/
+        scp->flowrem_sw = DN_SEND;
+	scp->flowloc_sw = DN_SEND;
+	scp->flowrem_dat = 0;
+	scp->flowrem_oth = 1;
+	scp->flowloc_dat = 0;
+	scp->flowloc_oth = 1;
+	scp->services_rem = 0;
+	scp->services_loc = 1 | NSP_FC_NONE;
+	scp->info_rem = 0;
+	scp->info_loc = 0x03; /* NSP version 4.1 */
+	scp->segsize_rem = 230 - DN_MAX_NSP_DATA_HEADER; /* Default: Updated by remote segsize */
+	scp->nonagle = 0;
+	scp->multi_ireq = 1;
+	scp->accept_mode = ACC_IMMED;
+	scp->addr.sdn_family    = AF_DECnet;
+	scp->peer.sdn_family    = AF_DECnet;
+	scp->accessdata.acc_accl = 5;
+	memcpy(scp->accessdata.acc_acc, "LINUX", 5);
+
+	scp->max_window   = NSP_MAX_WINDOW;
+	scp->snd_window   = NSP_MIN_WINDOW;
+	scp->nsp_srtt     = NSP_INITIAL_SRTT;
+	scp->nsp_rttvar   = NSP_INITIAL_RTTVAR;
+	scp->nsp_rxtshift = 0;
+
+	skb_queue_head_init(&scp->data_xmit_queue);
+	skb_queue_head_init(&scp->other_xmit_queue);
+	skb_queue_head_init(&scp->other_receive_queue);
+
+	scp->persist = 0;
+	scp->persist_fxn = NULL;
+	scp->keepalive = 10 * HZ;
+	scp->keepalive_fxn = dn_keepalive;
+
+	init_timer(&scp->delack_timer);
+	scp->delack_pending = 0;
+	scp->delack_fxn = dn_nsp_delayed_ack;
+
+	dn_start_slow_timer(sk);
+out:
+	return sk;
+}
+
+/*
+ * Keepalive timer.
+ * FIXME: Should respond to SO_KEEPALIVE etc.
+ */
+static void dn_keepalive(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+
+	/*
+	 * By checking the other_data transmit queue is empty
+	 * we are double checking that we are not sending too
+	 * many of these keepalive frames.
+	 */
+	if (skb_queue_len(&scp->other_xmit_queue) == 0)
+		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
+}
+
+
+/*
+ * Timer for shutdown/destroyed sockets.
+ * When socket is dead & no packets have been sent for a
+ * certain amount of time, they are removed by this
+ * routine. Also takes care of sending out DI & DC
+ * frames at correct times.
+ */
+int dn_destroy_timer(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+
+	scp->persist = dn_nsp_persist(sk);
+
+	switch(scp->state) {
+		case DN_DI:
+			dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
+			if (scp->nsp_rxtshift >= decnet_di_count)
+				scp->state = DN_CN;
+			return 0;
+
+		case DN_DR:
+			dn_nsp_send_disc(sk, NSP_DISCINIT, 0, GFP_ATOMIC);
+			if (scp->nsp_rxtshift >= decnet_dr_count)
+				scp->state = DN_DRC;
+			return 0;
+
+		case DN_DN:
+			if (scp->nsp_rxtshift < decnet_dn_count) {
+				/* printk(KERN_DEBUG "dn_destroy_timer: DN\n"); */
+				dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
+				return 0;
+			}
+	}
+
+	scp->persist = (HZ * decnet_time_wait);
+
+	if (sk->sk_socket)
+		return 0;
+
+	if ((jiffies - scp->stamp) >= (HZ * decnet_time_wait)) {
+		dn_unhash_sock(sk);
+		sock_put(sk);
+		return 1;
+	}
+
+	return 0;
+}
+
+static void dn_destroy_sock(struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+
+	scp->nsp_rxtshift = 0; /* reset back off */
+
+	if (sk->sk_socket) {
+		if (sk->sk_socket->state != SS_UNCONNECTED)
+			sk->sk_socket->state = SS_DISCONNECTING;
+	}
+
+	sk->sk_state = TCP_CLOSE;
+
+	switch(scp->state) {
+		case DN_DN:
+			dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC,
+					 sk->sk_allocation);
+			scp->persist_fxn = dn_destroy_timer;
+			scp->persist = dn_nsp_persist(sk);
+			break;
+		case DN_CR:
+			scp->state = DN_DR;
+			goto disc_reject;
+		case DN_RUN:
+			scp->state = DN_DI;
+		case DN_DI:
+		case DN_DR:
+disc_reject:
+			dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
+		case DN_NC:
+		case DN_NR:
+		case DN_RJ:
+		case DN_DIC:
+		case DN_CN:
+		case DN_DRC:
+		case DN_CI:
+		case DN_CD:
+			scp->persist_fxn = dn_destroy_timer;
+			scp->persist = dn_nsp_persist(sk);
+			break;
+		default:
+			printk(KERN_DEBUG "DECnet: dn_destroy_sock passed socket in invalid state\n");
+		case DN_O:
+			dn_stop_slow_timer(sk);
+
+			dn_unhash_sock_bh(sk);
+			sock_put(sk);
+
+			break;
+	}
+}
+
+char *dn_addr2asc(dn_address addr, char *buf)
+{
+	unsigned short node, area;
+
+	node = addr & 0x03ff;
+	area = addr >> 10;
+	sprintf(buf, "%hd.%hd", area, node);
+
+	return buf;
+}
+
+
+
+static int dn_create(struct socket *sock, int protocol)
+{
+	struct sock *sk;
+
+	switch(sock->type) {
+		case SOCK_SEQPACKET:
+			if (protocol != DNPROTO_NSP)
+				return -EPROTONOSUPPORT;
+			break;
+		case SOCK_STREAM:
+			break;
+		default:
+			return -ESOCKTNOSUPPORT;
+	}
+
+
+	if ((sk = dn_alloc_sock(sock, GFP_KERNEL)) == NULL) 
+		return -ENOBUFS;
+
+	sk->sk_protocol = protocol;
+
+	return 0;
+}
+
+
+static int
+dn_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	if (sk) {
+		sock_orphan(sk);
+		sock_hold(sk);
+		lock_sock(sk);
+		dn_destroy_sock(sk);
+		release_sock(sk);
+		sock_put(sk);
+	}
+
+        return 0;
+}
+
+static int dn_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	struct sockaddr_dn *saddr = (struct sockaddr_dn *)uaddr;
+	struct net_device *dev;
+	int rv;
+
+	if (addr_len != sizeof(struct sockaddr_dn))
+		return -EINVAL;
+
+	if (saddr->sdn_family != AF_DECnet)
+		return -EINVAL;
+
+	if (dn_ntohs(saddr->sdn_nodeaddrl) && (dn_ntohs(saddr->sdn_nodeaddrl) != 2))
+		return -EINVAL;
+
+	if (dn_ntohs(saddr->sdn_objnamel) > DN_MAXOBJL)
+		return -EINVAL;
+
+	if (saddr->sdn_flags & ~SDF_WILD)
+		return -EINVAL;
+
+#if 1
+	if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
+	    (saddr->sdn_flags & SDF_WILD)))
+		return -EACCES;
+#else
+	/*
+	 * Maybe put the default actions in the default security ops for
+	 * dn_prot_sock ? Would be nice if the capable call would go there
+	 * too.
+	 */
+	if (security_dn_prot_sock(saddr) &&
+	    !capable(CAP_NET_BIND_SERVICE) || 
+	    saddr->sdn_objnum || (saddr->sdn_flags & SDF_WILD))
+		return -EACCES;
+#endif
+
+
+	if (!(saddr->sdn_flags & SDF_WILD)) {
+		if (dn_ntohs(saddr->sdn_nodeaddrl)) {
+			read_lock(&dev_base_lock);
+			for(dev = dev_base; dev; dev = dev->next) {
+				if (!dev->dn_ptr)
+					continue;
+				if (dn_dev_islocal(dev, dn_saddr2dn(saddr)))
+					break;
+			}
+			read_unlock(&dev_base_lock);
+			if (dev == NULL)
+				return -EADDRNOTAVAIL;
+		}
+	}
+
+	rv = -EINVAL;
+	lock_sock(sk);
+	if (sock_flag(sk, SOCK_ZAPPED)) {
+		memcpy(&scp->addr, saddr, addr_len);
+		sock_reset_flag(sk, SOCK_ZAPPED);
+
+		rv = dn_hash_sock(sk);
+		if (rv)
+			sock_set_flag(sk, SOCK_ZAPPED);
+	}
+	release_sock(sk);
+
+        return rv;
+}
+
+
+static int dn_auto_bind(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	int rv;
+
+	sock_reset_flag(sk, SOCK_ZAPPED);
+
+	scp->addr.sdn_flags  = 0;
+	scp->addr.sdn_objnum = 0;
+
+	/*
+	 * This stuff is to keep compatibility with Eduardo's
+	 * patch. I hope I can dispense with it shortly...
+	 */
+	if ((scp->accessdata.acc_accl != 0) &&
+		(scp->accessdata.acc_accl <= 12)) {
+	
+		scp->addr.sdn_objnamel = dn_htons(scp->accessdata.acc_accl);
+		memcpy(scp->addr.sdn_objname, scp->accessdata.acc_acc, dn_ntohs(scp->addr.sdn_objnamel));
+
+		scp->accessdata.acc_accl = 0;
+		memset(scp->accessdata.acc_acc, 0, 40);
+	}
+	/* End of compatibility stuff */
+
+	scp->addr.sdn_add.a_len = dn_htons(2);
+	rv = dn_dev_bind_default((dn_address *)scp->addr.sdn_add.a_addr);
+	if (rv == 0) {
+		rv = dn_hash_sock(sk);
+		if (rv)
+			sock_set_flag(sk, SOCK_ZAPPED);
+	}
+
+	return rv;
+}
+
+static int dn_confirm_accept(struct sock *sk, long *timeo, int allocation)
+{
+	struct dn_scp *scp = DN_SK(sk);
+	DEFINE_WAIT(wait);
+	int err;
+
+	if (scp->state != DN_CR)
+		return -EINVAL;
+
+	scp->state = DN_CC;
+	scp->segsize_loc = dst_metric(__sk_dst_get(sk), RTAX_ADVMSS);
+	dn_send_conn_conf(sk, allocation);
+
+	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	for(;;) {
+		release_sock(sk);
+		if (scp->state == DN_CC)
+			*timeo = schedule_timeout(*timeo);
+		lock_sock(sk);
+		err = 0;
+		if (scp->state == DN_RUN)
+			break;
+		err = sock_error(sk);
+		if (err)
+			break;
+		err = sock_intr_errno(*timeo);
+		if (signal_pending(current))
+			break;
+		err = -EAGAIN;
+		if (!*timeo)
+			break;
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	}
+	finish_wait(sk->sk_sleep, &wait);
+	if (err == 0) {
+		sk->sk_socket->state = SS_CONNECTED;
+	} else if (scp->state != DN_CC) {
+		sk->sk_socket->state = SS_UNCONNECTED;
+	}
+	return err;
+}
+
+static int dn_wait_run(struct sock *sk, long *timeo)
+{
+	struct dn_scp *scp = DN_SK(sk);
+	DEFINE_WAIT(wait);
+	int err = 0;
+
+	if (scp->state == DN_RUN)
+		goto out;
+
+	if (!*timeo)
+		return -EALREADY;
+
+	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	for(;;) {
+		release_sock(sk);
+		if (scp->state == DN_CI || scp->state == DN_CC)
+			*timeo = schedule_timeout(*timeo);
+		lock_sock(sk);
+		err = 0;
+		if (scp->state == DN_RUN)
+			break;
+		err = sock_error(sk);
+		if (err)
+			break;
+		err = sock_intr_errno(*timeo);
+		if (signal_pending(current))
+			break;
+		err = -ETIMEDOUT;
+		if (!*timeo)
+			break;
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	}
+	finish_wait(sk->sk_sleep, &wait);
+out:
+	if (err == 0) {
+		sk->sk_socket->state = SS_CONNECTED;
+	} else if (scp->state != DN_CI && scp->state != DN_CC) {
+		sk->sk_socket->state = SS_UNCONNECTED;
+	}
+	return err;
+}
+
+static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
+{
+	struct socket *sock = sk->sk_socket;
+	struct dn_scp *scp = DN_SK(sk);
+	int err = -EISCONN;
+	struct flowi fl;
+
+	if (sock->state == SS_CONNECTED)
+		goto out;
+
+	if (sock->state == SS_CONNECTING) {
+		err = 0;
+		if (scp->state == DN_RUN) {
+			sock->state = SS_CONNECTED;
+			goto out;
+		}
+		err = -ECONNREFUSED;
+		if (scp->state != DN_CI && scp->state != DN_CC) {
+			sock->state = SS_UNCONNECTED;
+			goto out;
+		}
+		return dn_wait_run(sk, timeo);
+	}
+
+	err = -EINVAL;
+	if (scp->state != DN_O)
+		goto out;
+
+	if (addr == NULL || addrlen != sizeof(struct sockaddr_dn))
+		goto out;
+	if (addr->sdn_family != AF_DECnet)
+		goto out;
+	if (addr->sdn_flags & SDF_WILD)
+		goto out;
+
+	if (sock_flag(sk, SOCK_ZAPPED)) {
+		err = dn_auto_bind(sk->sk_socket);
+		if (err)
+			goto out;
+	}
+
+	memcpy(&scp->peer, addr, sizeof(struct sockaddr_dn));
+
+	err = -EHOSTUNREACH;
+	memset(&fl, 0, sizeof(fl));
+	fl.oif = sk->sk_bound_dev_if;
+	fl.fld_dst = dn_saddr2dn(&scp->peer);
+	fl.fld_src = dn_saddr2dn(&scp->addr);
+	dn_sk_ports_copy(&fl, scp);
+	fl.proto = DNPROTO_NSP;
+	if (dn_route_output_sock(&sk->sk_dst_cache, &fl, sk, flags) < 0)
+		goto out;
+	sk->sk_route_caps = sk->sk_dst_cache->dev->features;
+	sock->state = SS_CONNECTING;
+	scp->state = DN_CI;
+	scp->segsize_loc = dst_metric(sk->sk_dst_cache, RTAX_ADVMSS);
+
+	dn_nsp_send_conninit(sk, NSP_CI);
+	err = -EINPROGRESS;
+	if (*timeo) {
+		err = dn_wait_run(sk, timeo);
+	}
+out:
+	return err;
+}
+
+static int dn_connect(struct socket *sock, struct sockaddr *uaddr, int addrlen, int flags)
+{
+	struct sockaddr_dn *addr = (struct sockaddr_dn *)uaddr;
+	struct sock *sk = sock->sk;
+	int err;
+	long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
+
+	lock_sock(sk);
+	err = __dn_connect(sk, addr, addrlen, &timeo, 0);
+	release_sock(sk);
+
+	return err;
+}
+
+static inline int dn_check_state(struct sock *sk, struct sockaddr_dn *addr, int addrlen, long *timeo, int flags)
+{
+	struct dn_scp *scp = DN_SK(sk);
+
+	switch(scp->state) {
+		case DN_RUN:
+			return 0;
+		case DN_CR:
+			return dn_confirm_accept(sk, timeo, sk->sk_allocation);
+		case DN_CI:
+		case DN_CC:
+			return dn_wait_run(sk, timeo);
+		case DN_O:
+			return __dn_connect(sk, addr, addrlen, timeo, flags);
+	}
+
+	return -EINVAL;
+}
+
+
+static void dn_access_copy(struct sk_buff *skb, struct accessdata_dn *acc)
+{
+        unsigned char *ptr = skb->data;
+
+        acc->acc_userl = *ptr++;
+        memcpy(&acc->acc_user, ptr, acc->acc_userl);
+        ptr += acc->acc_userl;
+
+        acc->acc_passl = *ptr++;
+        memcpy(&acc->acc_pass, ptr, acc->acc_passl);
+        ptr += acc->acc_passl;
+
+        acc->acc_accl = *ptr++;
+        memcpy(&acc->acc_acc, ptr, acc->acc_accl);
+
+        skb_pull(skb, acc->acc_accl + acc->acc_passl + acc->acc_userl + 3);
+
+}
+
+static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)
+{
+        unsigned char *ptr = skb->data;
+        
+        opt->opt_optl   = *ptr++;
+        opt->opt_status = 0;
+        memcpy(opt->opt_data, ptr, opt->opt_optl);
+        skb_pull(skb, opt->opt_optl + 1);
+
+}
+
+static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
+{
+	DEFINE_WAIT(wait);
+	struct sk_buff *skb = NULL;
+	int err = 0;
+
+	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	for(;;) {
+		release_sock(sk);
+		skb = skb_dequeue(&sk->sk_receive_queue);
+		if (skb == NULL) {
+			*timeo = schedule_timeout(*timeo);
+			skb = skb_dequeue(&sk->sk_receive_queue);
+		}
+		lock_sock(sk);
+		if (skb != NULL)
+			break;
+		err = -EINVAL;
+		if (sk->sk_state != TCP_LISTEN)
+			break;
+		err = sock_intr_errno(*timeo);
+		if (signal_pending(current))
+			break;
+		err = -EAGAIN;
+		if (!*timeo)
+			break;
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	}
+	finish_wait(sk->sk_sleep, &wait);
+
+	return skb == NULL ? ERR_PTR(err) : skb;
+}
+
+static int dn_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+	struct sock *sk = sock->sk, *newsk;
+	struct sk_buff *skb = NULL;
+	struct dn_skb_cb *cb;
+	unsigned char menuver;
+	int err = 0;
+	unsigned char type;
+	long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+
+	lock_sock(sk);
+
+        if (sk->sk_state != TCP_LISTEN || DN_SK(sk)->state != DN_O) {
+		release_sock(sk);
+		return -EINVAL;
+	}
+
+	skb = skb_dequeue(&sk->sk_receive_queue);
+	if (skb == NULL) {
+		skb = dn_wait_for_connect(sk, &timeo);
+		if (IS_ERR(skb)) {
+			release_sock(sk);
+			return PTR_ERR(skb);
+		}
+	}
+
+	cb = DN_SKB_CB(skb);
+	sk->sk_ack_backlog--;
+	newsk = dn_alloc_sock(newsock, sk->sk_allocation);
+	if (newsk == NULL) {
+		release_sock(sk);
+		kfree_skb(skb);
+		return -ENOBUFS;
+	}
+	release_sock(sk);
+
+	dst_release(xchg(&newsk->sk_dst_cache, skb->dst));
+	skb->dst = NULL;
+
+        DN_SK(newsk)->state        = DN_CR;
+	DN_SK(newsk)->addrrem      = cb->src_port;
+	DN_SK(newsk)->services_rem = cb->services;
+	DN_SK(newsk)->info_rem     = cb->info;
+	DN_SK(newsk)->segsize_rem  = cb->segsize;
+	DN_SK(newsk)->accept_mode  = DN_SK(sk)->accept_mode;
+	
+	if (DN_SK(newsk)->segsize_rem < 230)
+		DN_SK(newsk)->segsize_rem = 230;
+
+	if ((DN_SK(newsk)->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
+		DN_SK(newsk)->max_window = decnet_no_fc_max_cwnd;
+
+	newsk->sk_state  = TCP_LISTEN;
+	memcpy(&(DN_SK(newsk)->addr), &(DN_SK(sk)->addr), sizeof(struct sockaddr_dn));
+
+	/*
+	 * If we are listening on a wild socket, we don't want
+	 * the newly created socket on the wrong hash queue.
+	 */
+	DN_SK(newsk)->addr.sdn_flags &= ~SDF_WILD;
+
+	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->addr), &type));
+	skb_pull(skb, dn_username2sockaddr(skb->data, skb->len, &(DN_SK(newsk)->peer), &type));
+	*(dn_address *)(DN_SK(newsk)->peer.sdn_add.a_addr) = cb->src;
+	*(dn_address *)(DN_SK(newsk)->addr.sdn_add.a_addr) = cb->dst;
+
+	menuver = *skb->data;
+	skb_pull(skb, 1);
+
+	if (menuver & DN_MENUVER_ACC)
+		dn_access_copy(skb, &(DN_SK(newsk)->accessdata));
+
+	if (menuver & DN_MENUVER_USR)
+		dn_user_copy(skb, &(DN_SK(newsk)->conndata_in));
+
+	if (menuver & DN_MENUVER_PRX)
+		DN_SK(newsk)->peer.sdn_flags |= SDF_PROXY;
+
+	if (menuver & DN_MENUVER_UIC)
+		DN_SK(newsk)->peer.sdn_flags |= SDF_UICPROXY;
+
+	kfree_skb(skb);
+
+	memcpy(&(DN_SK(newsk)->conndata_out), &(DN_SK(sk)->conndata_out),
+		sizeof(struct optdata_dn));
+	memcpy(&(DN_SK(newsk)->discdata_out), &(DN_SK(sk)->discdata_out),
+		sizeof(struct optdata_dn));
+
+	lock_sock(newsk);
+	err = dn_hash_sock(newsk);
+	if (err == 0) {
+		sock_reset_flag(newsk, SOCK_ZAPPED);
+		dn_send_conn_ack(newsk);
+
+		/*
+	 	 * Here we use sk->sk_allocation since although the conn conf is
+	 	 * for the newsk, the context is the old socket.
+	 	 */
+		if (DN_SK(newsk)->accept_mode == ACC_IMMED)
+			err = dn_confirm_accept(newsk, &timeo,
+						sk->sk_allocation);
+	}
+	release_sock(newsk);
+        return err;
+}
+
+
+static int dn_getname(struct socket *sock, struct sockaddr *uaddr,int *uaddr_len,int peer)
+{
+	struct sockaddr_dn *sa = (struct sockaddr_dn *)uaddr;
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+
+	*uaddr_len = sizeof(struct sockaddr_dn);
+
+	lock_sock(sk);
+
+	if (peer) {
+		if ((sock->state != SS_CONNECTED && 
+		     sock->state != SS_CONNECTING) && 
+		    scp->accept_mode == ACC_IMMED)
+			return -ENOTCONN;
+
+		memcpy(sa, &scp->peer, sizeof(struct sockaddr_dn));
+	} else {
+		memcpy(sa, &scp->addr, sizeof(struct sockaddr_dn));
+	}
+
+	release_sock(sk);
+
+        return 0;
+}
+
+
+static unsigned int dn_poll(struct file *file, struct socket *sock, poll_table  *wait)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	int mask = datagram_poll(file, sock, wait);
+
+	if (skb_queue_len(&scp->other_receive_queue))
+		mask |= POLLRDBAND;
+
+	return mask;
+}
+
+static int dn_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	int err = -EOPNOTSUPP;
+	long amount = 0;
+	struct sk_buff *skb;
+	int val;
+
+	switch(cmd)
+	{
+	case SIOCGIFADDR:
+	case SIOCSIFADDR:
+		return dn_dev_ioctl(cmd, (void __user *)arg);
+
+	case SIOCATMARK:
+		lock_sock(sk);
+		val = (skb_queue_len(&scp->other_receive_queue) != 0);
+		if (scp->state != DN_RUN)
+			val = -ENOTCONN;
+		release_sock(sk);
+		return val;
+
+	case TIOCOUTQ:
+		amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
+		if (amount < 0)
+			amount = 0;
+		err = put_user(amount, (int __user *)arg);
+		break;
+
+	case TIOCINQ:
+		lock_sock(sk);
+		if ((skb = skb_peek(&scp->other_receive_queue)) != NULL) {
+			amount = skb->len;
+		} else {
+			struct sk_buff *skb = sk->sk_receive_queue.next;
+			for(;;) {
+				if (skb ==
+				    (struct sk_buff *)&sk->sk_receive_queue)
+					break;
+				amount += skb->len;
+				skb = skb->next;
+			}
+		}
+		release_sock(sk);
+		err = put_user(amount, (int __user *)arg);
+		break;
+
+	default:
+		err = dev_ioctl(cmd, (void __user *)arg);
+		break;
+	}
+
+	return err;
+}
+
+static int dn_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	int err = -EINVAL;
+
+	lock_sock(sk);
+
+	if (sock_flag(sk, SOCK_ZAPPED))
+		goto out;
+
+	if ((DN_SK(sk)->state != DN_O) || (sk->sk_state == TCP_LISTEN))
+		goto out;
+
+	sk->sk_max_ack_backlog = backlog;
+	sk->sk_ack_backlog     = 0;
+	sk->sk_state           = TCP_LISTEN;
+	err                 = 0;
+	dn_rehash_sock(sk);
+
+out:
+	release_sock(sk);
+
+        return err;
+}
+
+
+static int dn_shutdown(struct socket *sock, int how)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	int err = -ENOTCONN;
+
+	lock_sock(sk);
+
+	if (sock->state == SS_UNCONNECTED)
+		goto out;
+
+	err = 0;
+	if (sock->state == SS_DISCONNECTING)
+		goto out;
+
+	err = -EINVAL;
+	if (scp->state == DN_O)
+		goto out;
+
+	if (how != SHUTDOWN_MASK)
+		goto out;
+
+	sk->sk_shutdown = how;
+	dn_destroy_sock(sk);
+	err = 0;
+
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+static int dn_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
+{
+	struct sock *sk = sock->sk;
+	int err;
+
+	lock_sock(sk);
+	err = __dn_setsockopt(sock, level, optname, optval, optlen, 0);
+	release_sock(sk);
+
+	return err;
+}
+
+static int __dn_setsockopt(struct socket *sock, int level,int optname, char __user *optval, int optlen, int flags) 
+{
+	struct	sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	long timeo;
+	union {
+		struct optdata_dn opt;
+		struct accessdata_dn acc;
+		int mode;
+		unsigned long win;
+		int val;
+		unsigned char services;
+		unsigned char info;
+	} u;
+	int err;
+
+	if (optlen && !optval)
+		return -EINVAL;
+
+	if (optlen > sizeof(u))
+		return -EINVAL;
+
+	if (copy_from_user(&u, optval, optlen))
+		return -EFAULT;
+
+	switch(optname) {
+		case DSO_CONDATA:
+			if (sock->state == SS_CONNECTED) 
+				return -EISCONN;
+			if ((scp->state != DN_O) && (scp->state != DN_CR))
+				return -EINVAL;
+
+			if (optlen != sizeof(struct optdata_dn))
+				return -EINVAL;
+
+			if (u.opt.opt_optl > 16)
+				return -EINVAL;
+
+			memcpy(&scp->conndata_out, &u.opt, optlen);
+			break;
+
+		case DSO_DISDATA:
+	   	        if (sock->state != SS_CONNECTED && scp->accept_mode == ACC_IMMED)
+				return -ENOTCONN;
+
+			if (optlen != sizeof(struct optdata_dn))
+				return -EINVAL;
+
+			if (u.opt.opt_optl > 16)
+				return -EINVAL;
+
+			memcpy(&scp->discdata_out, &u.opt, optlen);
+			break;
+
+		case DSO_CONACCESS:
+			if (sock->state == SS_CONNECTED) 
+				return -EISCONN;
+			if (scp->state != DN_O)
+				return -EINVAL;
+
+			if (optlen != sizeof(struct accessdata_dn))
+				return -EINVAL;
+
+			if ((u.acc.acc_accl > DN_MAXACCL) ||
+					(u.acc.acc_passl > DN_MAXACCL) ||
+					(u.acc.acc_userl > DN_MAXACCL))
+				return -EINVAL;
+
+			memcpy(&scp->accessdata, &u.acc, optlen);
+			break;
+
+		case DSO_ACCEPTMODE:
+			if (sock->state == SS_CONNECTED)
+				return -EISCONN;
+			if (scp->state != DN_O)
+				return -EINVAL;
+
+			if (optlen != sizeof(int))
+				return -EINVAL;
+
+			if ((u.mode != ACC_IMMED) && (u.mode != ACC_DEFER))
+				return -EINVAL;
+
+			scp->accept_mode = (unsigned char)u.mode;
+			break;
+
+		case DSO_CONACCEPT:
+
+			if (scp->state != DN_CR)
+				return -EINVAL;
+			timeo = sock_rcvtimeo(sk, 0);
+			err = dn_confirm_accept(sk, &timeo, sk->sk_allocation);
+			return err;
+
+		case DSO_CONREJECT:
+
+			if (scp->state != DN_CR)
+				return -EINVAL;
+
+			scp->state = DN_DR;
+			sk->sk_shutdown = SHUTDOWN_MASK;
+			dn_nsp_send_disc(sk, 0x38, 0, sk->sk_allocation);
+			break;
+
+		default:
+#ifdef CONFIG_NETFILTER
+		return nf_setsockopt(sk, PF_DECnet, optname, optval, optlen);
+#endif
+		case DSO_LINKINFO:
+		case DSO_STREAM:
+		case DSO_SEQPACKET:
+			return -ENOPROTOOPT;
+
+		case DSO_MAXWINDOW:
+			if (optlen != sizeof(unsigned long))
+				return -EINVAL;
+			if (u.win > NSP_MAX_WINDOW)
+				u.win = NSP_MAX_WINDOW;
+			if (u.win == 0)
+				return -EINVAL;
+			scp->max_window = u.win;
+			if (scp->snd_window > u.win)
+				scp->snd_window = u.win;
+			break;
+
+		case DSO_NODELAY:
+			if (optlen != sizeof(int))
+				return -EINVAL;
+			if (scp->nonagle == 2)
+				return -EINVAL;
+			scp->nonagle = (u.val == 0) ? 0 : 1;
+			/* if (scp->nonagle == 1) { Push pending frames } */
+			break;
+
+		case DSO_CORK:
+			if (optlen != sizeof(int))
+				return -EINVAL;
+			if (scp->nonagle == 1)
+				return -EINVAL;
+			scp->nonagle = (u.val == 0) ? 0 : 2;
+			/* if (scp->nonagle == 0) { Push pending frames } */
+			break;
+
+		case DSO_SERVICES:
+			if (optlen != sizeof(unsigned char))
+				return -EINVAL;
+			if ((u.services & ~NSP_FC_MASK) != 0x01)
+				return -EINVAL;
+			if ((u.services & NSP_FC_MASK) == NSP_FC_MASK)
+				return -EINVAL;
+			scp->services_loc = u.services;
+			break;
+
+		case DSO_INFO:
+			if (optlen != sizeof(unsigned char))
+				return -EINVAL;
+			if (u.info & 0xfc)
+				return -EINVAL;
+			scp->info_loc = u.info;
+			break;
+	}
+
+	return 0;
+}
+
+static int dn_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	int err;
+
+	lock_sock(sk);
+	err = __dn_getsockopt(sock, level, optname, optval, optlen, 0);
+	release_sock(sk);
+
+	return err;
+}
+
+static int __dn_getsockopt(struct socket *sock, int level,int optname, char __user *optval,int __user *optlen, int flags)
+{
+	struct	sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	struct linkinfo_dn link;
+	unsigned int r_len;
+	void *r_data = NULL;
+	unsigned int val;
+
+	if(get_user(r_len , optlen))
+		return -EFAULT;
+		
+	switch(optname) {
+		case DSO_CONDATA:
+			if (r_len > sizeof(struct optdata_dn))
+				r_len = sizeof(struct optdata_dn);
+			r_data = &scp->conndata_in;
+			break;
+
+		case DSO_DISDATA:
+			if (r_len > sizeof(struct optdata_dn))
+				r_len = sizeof(struct optdata_dn);
+			r_data = &scp->discdata_in;
+			break;
+
+		case DSO_CONACCESS:
+			if (r_len > sizeof(struct accessdata_dn))
+				r_len = sizeof(struct accessdata_dn);
+			r_data = &scp->accessdata;
+			break;
+
+		case DSO_ACCEPTMODE:
+			if (r_len > sizeof(unsigned char))
+				r_len = sizeof(unsigned char);
+			r_data = &scp->accept_mode;
+			break;
+
+		case DSO_LINKINFO:
+			if (r_len > sizeof(struct linkinfo_dn))
+				r_len = sizeof(struct linkinfo_dn);
+
+			switch(sock->state) {
+				case SS_CONNECTING:
+					link.idn_linkstate = LL_CONNECTING;
+					break;
+				case SS_DISCONNECTING:
+					link.idn_linkstate = LL_DISCONNECTING;
+					break;
+				case SS_CONNECTED:
+					link.idn_linkstate = LL_RUNNING;
+					break;
+				default:
+					link.idn_linkstate = LL_INACTIVE;
+			}
+
+			link.idn_segsize = scp->segsize_rem;
+			r_data = &link;
+			break;
+
+		default:
+#ifdef CONFIG_NETFILTER
+		{
+			int val, len;
+			
+			if(get_user(len, optlen))
+				return -EFAULT;
+			
+			val = nf_getsockopt(sk, PF_DECnet, optname, 
+							optval, &len);
+			if (val >= 0)
+				val = put_user(len, optlen);
+			return val;
+		}
+#endif
+		case DSO_STREAM:
+		case DSO_SEQPACKET:
+		case DSO_CONACCEPT:
+		case DSO_CONREJECT:
+        		return -ENOPROTOOPT;
+
+		case DSO_MAXWINDOW:
+			if (r_len > sizeof(unsigned long))
+				r_len = sizeof(unsigned long);
+			r_data = &scp->max_window;
+			break;
+
+		case DSO_NODELAY:
+			if (r_len > sizeof(int))
+				r_len = sizeof(int);
+			val = (scp->nonagle == 1);
+			r_data = &val;
+			break;
+
+		case DSO_CORK:
+			if (r_len > sizeof(int))
+				r_len = sizeof(int);
+			val = (scp->nonagle == 2);
+			r_data = &val;
+			break;
+
+		case DSO_SERVICES:
+			if (r_len > sizeof(unsigned char))
+				r_len = sizeof(unsigned char);
+			r_data = &scp->services_rem;
+			break;
+
+		case DSO_INFO:
+			if (r_len > sizeof(unsigned char))
+				r_len = sizeof(unsigned char);
+			r_data = &scp->info_rem;
+			break;
+	}
+
+	if (r_data) {
+		if (copy_to_user(optval, r_data, r_len))
+			return -EFAULT;
+		if (put_user(r_len, optlen))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+
+static int dn_data_ready(struct sock *sk, struct sk_buff_head *q, int flags, int target)
+{
+	struct sk_buff *skb = q->next;
+	int len = 0;
+
+	if (flags & MSG_OOB)
+		return skb_queue_len(q) ? 1 : 0;
+
+	while(skb != (struct sk_buff *)q) {
+		struct dn_skb_cb *cb = DN_SKB_CB(skb);
+		len += skb->len;
+
+		if (cb->nsp_flags & 0x40) {
+			/* SOCK_SEQPACKET reads to EOM */
+			if (sk->sk_type == SOCK_SEQPACKET)
+				return 1;
+			/* so does SOCK_STREAM unless WAITALL is specified */
+			if (!(flags & MSG_WAITALL))
+				return 1;
+		}
+
+		/* minimum data length for read exceeded */
+		if (len >= target)
+			return 1;
+
+		skb = skb->next;
+	}
+
+	return 0;
+}
+
+
+static int dn_recvmsg(struct kiocb *iocb, struct socket *sock,
+	struct msghdr *msg, size_t size, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	struct sk_buff_head *queue = &sk->sk_receive_queue;
+	size_t target = size > 1 ? 1 : 0;
+	size_t copied = 0;
+	int rv = 0;
+	struct sk_buff *skb, *nskb;
+	struct dn_skb_cb *cb = NULL;
+	unsigned char eor = 0;
+	long timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+
+	lock_sock(sk);
+
+	if (sock_flag(sk, SOCK_ZAPPED)) {
+		rv = -EADDRNOTAVAIL;
+		goto out;
+	}
+
+	rv = dn_check_state(sk, NULL, 0, &timeo, flags);
+	if (rv)
+		goto out;
+
+	if (sk->sk_shutdown & RCV_SHUTDOWN) {
+		if (!(flags & MSG_NOSIGNAL))
+			send_sig(SIGPIPE, current, 0);
+		rv = -EPIPE;
+		goto out;
+	}
+
+	if (flags & ~(MSG_PEEK|MSG_OOB|MSG_WAITALL|MSG_DONTWAIT|MSG_NOSIGNAL)) {
+		rv = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (flags & MSG_OOB)
+		queue = &scp->other_receive_queue;
+
+	if (flags & MSG_WAITALL)
+		target = size;
+
+
+	/*
+	 * See if there is data ready to read, sleep if there isn't
+	 */
+	for(;;) {
+		if (sk->sk_err)
+			goto out;
+
+		if (skb_queue_len(&scp->other_receive_queue)) {
+			if (!(flags & MSG_OOB)) {
+				msg->msg_flags |= MSG_OOB;
+				if (!scp->other_report) {
+					scp->other_report = 1;
+					goto out;
+				}
+			}
+		}
+		
+		if (scp->state != DN_RUN)
+			goto out;
+
+		if (signal_pending(current)) {
+			rv = sock_intr_errno(timeo);
+			goto out;
+		}
+
+		if (dn_data_ready(sk, queue, flags, target))
+			break;
+
+		if (flags & MSG_DONTWAIT) {
+			rv = -EWOULDBLOCK;
+			goto out;
+		}
+
+		set_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
+		SOCK_SLEEP_PRE(sk)
+
+		if (!dn_data_ready(sk, queue, flags, target))
+			schedule();
+
+		SOCK_SLEEP_POST(sk)
+		clear_bit(SOCK_ASYNC_WAITDATA, &sock->flags);
+	}
+
+	for(skb = queue->next; skb != (struct sk_buff *)queue; skb = nskb) {
+		unsigned int chunk = skb->len;
+		cb = DN_SKB_CB(skb);
+
+		if ((chunk + copied) > size)
+			chunk = size - copied;
+
+		if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
+			rv = -EFAULT;
+			break;
+		}
+		copied += chunk;
+
+		if (!(flags & MSG_PEEK))
+			skb_pull(skb, chunk);
+
+		eor = cb->nsp_flags & 0x40;
+		nskb = skb->next;
+
+		if (skb->len == 0) {
+			skb_unlink(skb);
+			kfree_skb(skb);
+			/* 
+			 * N.B. Don't refer to skb or cb after this point
+			 * in loop.
+			 */
+			if ((scp->flowloc_sw == DN_DONTSEND) && !dn_congested(sk)) {
+				scp->flowloc_sw = DN_SEND;
+				dn_nsp_send_link(sk, DN_SEND, 0);
+			}
+		}
+
+		if (eor) { 
+			if (sk->sk_type == SOCK_SEQPACKET)
+				break;
+			if (!(flags & MSG_WAITALL))
+				break;
+		}
+
+		if (flags & MSG_OOB)
+			break;
+
+		if (copied >= target)
+			break;
+	}
+
+	rv = copied;
+
+
+	if (eor && (sk->sk_type == SOCK_SEQPACKET))
+		msg->msg_flags |= MSG_EOR;
+
+out:
+	if (rv == 0)
+		rv = (flags & MSG_PEEK) ? -sk->sk_err : sock_error(sk);
+
+	if ((rv >= 0) && msg->msg_name) {
+		memcpy(msg->msg_name, &scp->peer, sizeof(struct sockaddr_dn));
+		msg->msg_namelen = sizeof(struct sockaddr_dn);
+	}
+
+	release_sock(sk);
+
+	return rv;
+}
+
+
+static inline int dn_queue_too_long(struct dn_scp *scp, struct sk_buff_head *queue, int flags)
+{
+	unsigned char fctype = scp->services_rem & NSP_FC_MASK;
+	if (skb_queue_len(queue) >= scp->snd_window)
+		return 1;
+	if (fctype != NSP_FC_NONE) {
+		if (flags & MSG_OOB) {
+			if (scp->flowrem_oth == 0)
+				return 1;
+		} else {
+			if (scp->flowrem_dat == 0)
+				return 1;
+		}
+	}
+	return 0;
+}
+
+/*
+ * The DECnet spec requires the the "routing layer" accepts packets which
+ * are at least 230 bytes in size. This excludes any headers which the NSP
+ * layer might add, so we always assume that we'll be using the maximal
+ * length header on data packets. The variation in length is due to the
+ * inclusion (or not) of the two 16 bit acknowledgement fields so it doesn't
+ * make much practical difference.
+ */
+unsigned dn_mss_from_pmtu(struct net_device *dev, int mtu)
+{
+	unsigned mss = 230 - DN_MAX_NSP_DATA_HEADER;
+	if (dev) {
+		struct dn_dev *dn_db = dev->dn_ptr;
+		mtu -= LL_RESERVED_SPACE(dev);
+		if (dn_db->use_long)
+			mtu -= 21;
+		else
+			mtu -= 6;
+		mtu -= DN_MAX_NSP_DATA_HEADER;
+	} else {
+		/*
+		 * 21 = long header, 16 = guess at MAC header length
+		 */
+		mtu -= (21 + DN_MAX_NSP_DATA_HEADER + 16);
+	}
+	if (mtu > mss)
+		mss = mtu;
+	return mss;
+}
+
+static inline unsigned int dn_current_mss(struct sock *sk, int flags)
+{
+	struct dst_entry *dst = __sk_dst_get(sk);
+	struct dn_scp *scp = DN_SK(sk);
+	int mss_now = min_t(int, scp->segsize_loc, scp->segsize_rem);
+
+	/* Other data messages are limited to 16 bytes per packet */
+	if (flags & MSG_OOB)
+		return 16;
+
+	/* This works out the maximum size of segment we can send out */
+	if (dst) {
+		u32 mtu = dst_mtu(dst);
+		mss_now = min_t(int, dn_mss_from_pmtu(dst->dev, mtu), mss_now);
+	}
+
+	return mss_now;
+}
+
+static int dn_error(struct sock *sk, int flags, int err)
+{
+	if (err == -EPIPE)
+		err = sock_error(sk) ? : -EPIPE;
+	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
+		send_sig(SIGPIPE, current, 0);
+	return err;
+}
+
+static int dn_sendmsg(struct kiocb *iocb, struct socket *sock,
+	   struct msghdr *msg, size_t size)
+{
+	struct sock *sk = sock->sk;
+	struct dn_scp *scp = DN_SK(sk);
+	size_t mss;
+	struct sk_buff_head *queue = &scp->data_xmit_queue;
+	int flags = msg->msg_flags;
+	int err = 0;
+	size_t sent = 0;
+	int addr_len = msg->msg_namelen;
+	struct sockaddr_dn *addr = (struct sockaddr_dn *)msg->msg_name;
+	struct sk_buff *skb = NULL;
+	struct dn_skb_cb *cb;
+	size_t len;
+	unsigned char fctype;
+	long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+
+	if (flags & ~(MSG_TRYHARD|MSG_OOB|MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|MSG_MORE|MSG_CMSG_COMPAT))
+		return -EOPNOTSUPP;
+
+	if (addr_len && (addr_len != sizeof(struct sockaddr_dn)))
+		return -EINVAL;
+
+	/*
+	 * The only difference between stream sockets and sequenced packet
+	 * sockets is that the stream sockets always behave as if MSG_EOR
+	 * has been set.
+	 */
+	if (sock->type == SOCK_STREAM) {
+		if (flags & MSG_EOR)
+			return -EINVAL;
+		flags |= MSG_EOR;
+	}
+
+	lock_sock(sk);
+
+	err = dn_check_state(sk, addr, addr_len, &timeo, flags);
+	if (err)
+		goto out_err;
+
+	if (sk->sk_shutdown & SEND_SHUTDOWN) {
+		err = -EPIPE;
+		goto out_err;
+	}
+
+	if ((flags & MSG_TRYHARD) && sk->sk_dst_cache)
+		dst_negative_advice(&sk->sk_dst_cache);
+
+	mss = scp->segsize_rem;
+	fctype = scp->services_rem & NSP_FC_MASK;
+
+	mss = dn_current_mss(sk, flags);
+
+	if (flags & MSG_OOB) {
+		queue = &scp->other_xmit_queue;
+		if (size > mss) {
+			err = -EMSGSIZE;
+			goto out;
+		}
+	}
+
+	scp->persist_fxn = dn_nsp_xmit_timeout;
+
+	while(sent < size) {
+		err = sock_error(sk);
+		if (err)
+			goto out;
+
+		if (signal_pending(current)) {
+			err = sock_intr_errno(timeo);
+			goto out;
+		}
+
+		/*
+		 * Calculate size that we wish to send.
+		 */
+		len = size - sent;
+
+		if (len > mss)
+			len = mss;
+
+		/*
+		 * Wait for queue size to go down below the window
+		 * size.
+		 */
+		if (dn_queue_too_long(scp, queue, flags)) {
+			if (flags & MSG_DONTWAIT) {
+				err = -EWOULDBLOCK;
+				goto out;
+			}
+
+			SOCK_SLEEP_PRE(sk)
+
+			if (dn_queue_too_long(scp, queue, flags))
+				schedule();
+
+			SOCK_SLEEP_POST(sk)
+
+			continue;
+		}
+
+		/*
+		 * Get a suitably sized skb.
+		 */
+		skb = dn_alloc_send_skb(sk, &len, flags & MSG_DONTWAIT, timeo, &err);
+
+		if (err)
+			break;
+
+		if (!skb)
+			continue;
+
+		cb = DN_SKB_CB(skb);
+
+		skb_reserve(skb, DN_MAX_NSP_DATA_HEADER);
+
+		if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
+			err = -EFAULT;
+			goto out;
+		}
+
+		if (flags & MSG_OOB) {
+			cb->nsp_flags = 0x30;
+			if (fctype != NSP_FC_NONE)
+				scp->flowrem_oth--;
+		} else {
+			cb->nsp_flags = 0x00;
+			if (scp->seg_total == 0)
+				cb->nsp_flags |= 0x20;
+
+			scp->seg_total += len;
+		
+			if (((sent + len) == size) && (flags & MSG_EOR)) {
+				cb->nsp_flags |= 0x40;
+				scp->seg_total = 0;
+				if (fctype == NSP_FC_SCMC)
+					scp->flowrem_dat--;
+			}
+			if (fctype == NSP_FC_SRC)
+				scp->flowrem_dat--;
+		}
+
+		sent += len;
+		dn_nsp_queue_xmit(sk, skb, sk->sk_allocation, flags & MSG_OOB);
+		skb = NULL;
+
+		scp->persist = dn_nsp_persist(sk);
+
+	}
+out:
+
+	if (skb)
+		kfree_skb(skb);
+
+	release_sock(sk);
+
+	return sent ? sent : err;
+
+out_err:
+	err = dn_error(sk, flags, err);
+	release_sock(sk);
+	return err;
+}
+
+static int dn_device_event(struct notifier_block *this, unsigned long event,
+			void *ptr)
+{
+	struct net_device *dev = (struct net_device *)ptr;
+
+	switch(event) {
+		case NETDEV_UP:
+			dn_dev_up(dev);
+			break;
+		case NETDEV_DOWN:
+			dn_dev_down(dev);
+			break;
+		default:
+			break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block dn_dev_notifier = {
+	.notifier_call = dn_device_event,
+};
+
+extern int dn_route_rcv(struct sk_buff *, struct net_device *, struct packet_type *);
+
+static struct packet_type dn_dix_packet_type = {
+	.type =		__constant_htons(ETH_P_DNA_RT),
+	.dev =		NULL,		/* All devices */
+	.func =		dn_route_rcv,
+};
+
+#ifdef CONFIG_PROC_FS
+struct dn_iter_state {
+	int bucket;
+};
+
+static struct sock *dn_socket_get_first(struct seq_file *seq)
+{
+	struct dn_iter_state *state = seq->private;
+	struct sock *n = NULL;
+
+	for(state->bucket = 0;
+	    state->bucket < DN_SK_HASH_SIZE;
+	    ++state->bucket) {
+		n = sk_head(&dn_sk_hash[state->bucket]);
+		if (n)
+			break;
+	}
+
+	return n;
+}
+
+static struct sock *dn_socket_get_next(struct seq_file *seq,
+				       struct sock *n)
+{
+	struct dn_iter_state *state = seq->private;
+
+	n = sk_next(n);
+try_again:
+	if (n)
+		goto out;
+	if (++state->bucket >= DN_SK_HASH_SIZE)
+		goto out;
+	n = sk_head(&dn_sk_hash[state->bucket]);
+	goto try_again;
+out:
+	return n;
+}
+
+static struct sock *socket_get_idx(struct seq_file *seq, loff_t *pos)
+{
+	struct sock *sk = dn_socket_get_first(seq);
+
+	if (sk) {
+		while(*pos && (sk = dn_socket_get_next(seq, sk)))
+			--*pos;
+	}
+	return *pos ? NULL : sk;
+}
+
+static void *dn_socket_get_idx(struct seq_file *seq, loff_t pos)
+{
+	void *rc;
+	read_lock_bh(&dn_hash_lock);
+	rc = socket_get_idx(seq, &pos);
+	if (!rc) {
+		read_unlock_bh(&dn_hash_lock);
+	}
+	return rc;
+}
+
+static void *dn_socket_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return *pos ? dn_socket_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *dn_socket_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	void *rc;
+
+	if (v == SEQ_START_TOKEN) {
+		rc = dn_socket_get_idx(seq, 0);
+		goto out;
+	}
+
+	rc = dn_socket_get_next(seq, v);
+	if (rc)
+		goto out;
+	read_unlock_bh(&dn_hash_lock);
+out:
+	++*pos;
+	return rc;
+}
+
+static void dn_socket_seq_stop(struct seq_file *seq, void *v)
+{
+	if (v && v != SEQ_START_TOKEN)
+		read_unlock_bh(&dn_hash_lock);
+}
+
+#define IS_NOT_PRINTABLE(x) ((x) < 32 || (x) > 126)
+
+static void dn_printable_object(struct sockaddr_dn *dn, unsigned char *buf)
+{
+	int i;
+    
+	switch (dn_ntohs(dn->sdn_objnamel)) {
+		case 0:
+			sprintf(buf, "%d", dn->sdn_objnum);
+			break;
+		default:
+			for (i = 0; i < dn_ntohs(dn->sdn_objnamel); i++) {
+				buf[i] = dn->sdn_objname[i];
+				if (IS_NOT_PRINTABLE(buf[i]))
+					buf[i] = '.';
+			}
+			buf[i] = 0;
+    	}
+}
+
+static char *dn_state2asc(unsigned char state)
+{
+	switch(state) {
+		case DN_O:
+			return "OPEN";
+		case DN_CR:
+			return "  CR";
+		case DN_DR:
+			return "  DR";
+		case DN_DRC:
+			return " DRC";
+		case DN_CC:
+			return "  CC";
+		case DN_CI:
+			return "  CI";
+		case DN_NR:
+			return "  NR";
+		case DN_NC:
+			return "  NC";
+		case DN_CD:
+			return "  CD";
+		case DN_RJ:
+			return "  RJ";
+		case DN_RUN:
+			return " RUN";
+		case DN_DI:
+			return "  DI";
+		case DN_DIC:
+			return " DIC";
+		case DN_DN:
+			return "  DN";
+		case DN_CL:
+			return "  CL";
+		case DN_CN:
+			return "  CN";
+	}
+
+	return "????";
+}
+
+static inline void dn_socket_format_entry(struct seq_file *seq, struct sock *sk)
+{
+	struct dn_scp *scp = DN_SK(sk);
+	char buf1[DN_ASCBUF_LEN];
+	char buf2[DN_ASCBUF_LEN];
+	char local_object[DN_MAXOBJL+3];
+	char remote_object[DN_MAXOBJL+3];
+
+	dn_printable_object(&scp->addr, local_object);
+	dn_printable_object(&scp->peer, remote_object);
+
+	seq_printf(seq,
+		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s "
+		   "%6s/%04X %04d:%04d %04d:%04d %01d %-16s %4s %s\n",
+		   dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->addr)), buf1),
+		   scp->addrloc,
+		   scp->numdat,
+		   scp->numoth,
+		   scp->ackxmt_dat,
+		   scp->ackxmt_oth,
+		   scp->flowloc_sw,
+		   local_object,
+		   dn_addr2asc(dn_ntohs(dn_saddr2dn(&scp->peer)), buf2),
+		   scp->addrrem,
+		   scp->numdat_rcv,
+		   scp->numoth_rcv,
+		   scp->ackrcv_dat,
+		   scp->ackrcv_oth,
+		   scp->flowrem_sw,
+		   remote_object,
+		   dn_state2asc(scp->state),
+		   ((scp->accept_mode == ACC_IMMED) ? "IMMED" : "DEFER"));
+}
+
+static int dn_socket_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq, "Local                                              Remote\n");
+	} else {
+		dn_socket_format_entry(seq, v);
+	}
+	return 0;
+}
+
+static struct seq_operations dn_socket_seq_ops = {
+	.start	= dn_socket_seq_start,
+	.next	= dn_socket_seq_next,
+	.stop	= dn_socket_seq_stop,
+	.show	= dn_socket_seq_show,
+};
+
+static int dn_socket_seq_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int rc = -ENOMEM;
+	struct dn_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+	if (!s)
+		goto out;
+
+	rc = seq_open(file, &dn_socket_seq_ops);
+	if (rc)
+		goto out_kfree;
+
+	seq		= file->private_data;
+	seq->private	= s;
+	memset(s, 0, sizeof(*s));
+out:
+	return rc;
+out_kfree:
+	kfree(s);
+	goto out;
+}
+
+static struct file_operations dn_socket_seq_fops = {
+	.owner		= THIS_MODULE,
+	.open		= dn_socket_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release_private,
+};
+#endif
+
+static struct net_proto_family	dn_family_ops = {
+	.family =	AF_DECnet,
+	.create =	dn_create,
+	.owner	=	THIS_MODULE,
+};
+
+static struct proto_ops dn_proto_ops = {
+	.family =	AF_DECnet,
+	.owner =	THIS_MODULE,
+	.release =	dn_release,
+	.bind =		dn_bind,
+	.connect =	dn_connect,
+	.socketpair =	sock_no_socketpair,
+	.accept =	dn_accept,
+	.getname =	dn_getname,
+	.poll =		dn_poll,
+	.ioctl =	dn_ioctl,
+	.listen =	dn_listen,
+	.shutdown =	dn_shutdown,
+	.setsockopt =	dn_setsockopt,
+	.getsockopt =	dn_getsockopt,
+	.sendmsg =	dn_sendmsg,
+	.recvmsg =	dn_recvmsg,
+	.mmap =		sock_no_mmap,
+	.sendpage =	sock_no_sendpage,
+};
+
+void dn_register_sysctl(void);
+void dn_unregister_sysctl(void);
+
+MODULE_DESCRIPTION("The Linux DECnet Network Protocol");
+MODULE_AUTHOR("Linux DECnet Project Team");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_DECnet);
+
+static char banner[] __initdata = KERN_INFO "NET4: DECnet for Linux: V.2.5.68s (C) 1995-2003 Linux DECnet Project Team\n";
+
+static int __init decnet_init(void)
+{
+	int rc;
+
+        printk(banner);
+
+	rc = proto_register(&dn_proto, 1);
+	if (rc != 0)
+		goto out;
+
+	dn_neigh_init();
+	dn_dev_init();
+	dn_route_init();
+	dn_fib_init();
+
+	sock_register(&dn_family_ops);
+	dev_add_pack(&dn_dix_packet_type);
+	register_netdevice_notifier(&dn_dev_notifier);
+
+	proc_net_fops_create("decnet", S_IRUGO, &dn_socket_seq_fops);
+	dn_register_sysctl();
+out:
+	return rc;
+
+}
+module_init(decnet_init);
+
+/*
+ * Prevent DECnet module unloading until its fixed properly.
+ * Requires an audit of the code to check for memory leaks and
+ * initialisation problems etc.
+ */
+#if 0
+static void __exit decnet_exit(void)
+{
+	sock_unregister(AF_DECnet);
+	dev_remove_pack(&dn_dix_packet_type);
+
+	dn_unregister_sysctl();
+
+	unregister_netdevice_notifier(&dn_dev_notifier);
+
+	dn_route_cleanup();
+	dn_dev_cleanup();
+	dn_neigh_cleanup();
+	dn_fib_cleanup();
+
+	proc_net_remove("decnet");
+
+	proto_unregister(&dn_proto);
+}
+module_exit(decnet_exit);
+#endif