Remove DECnet support from kernel

DECnet is an obsolete network protocol that receives more attention
from kernel janitors than users. It belongs in computer protocol
history museum not in Linux kernel.

It has been "Orphaned" in kernel since 2010. The iproute2 support
for DECnet was dropped in 5.0 release. The documentation link on
Sourceforge says it is abandoned there as well.

Leave the UAPI alone to keep userspace programs compiling.
This means that there is still an empty neighbour table
for AF_DECNET.

The table of /proc/sys/net entries was updated to match
current directories and reformatted to be alphabetical.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: David Ahern <dsahern@kernel.org>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

23 files changed, 1 insertions, 10683 deletions

diff --git a/net/Kconfig b/net/Kconfig
index 6b78f695caa6..48c33c222199 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -204,7 +204,6 @@ config BRIDGE_NETFILTER
 source "net/netfilter/Kconfig"
 source "net/ipv4/netfilter/Kconfig"
 source "net/ipv6/netfilter/Kconfig"
-source "net/decnet/netfilter/Kconfig"
 source "net/bridge/netfilter/Kconfig"
 
 endif
@@ -221,7 +220,6 @@ source "net/802/Kconfig"
 source "net/bridge/Kconfig"
 source "net/dsa/Kconfig"
 source "net/8021q/Kconfig"
-source "net/decnet/Kconfig"
 source "net/llc/Kconfig"
 source "drivers/net/appletalk/Kconfig"
 source "net/x25/Kconfig"
diff --git a/net/Makefile b/net/Makefile
index fbfeb8a0bb37..6a62e5b27378 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -38,7 +38,6 @@ obj-$(CONFIG_AF_KCM)		+= kcm/
 obj-$(CONFIG_STREAM_PARSER)	+= strparser/
 obj-$(CONFIG_ATM)		+= atm/
 obj-$(CONFIG_L2TP)		+= l2tp/
-obj-$(CONFIG_DECNET)		+= decnet/
 obj-$(CONFIG_PHONET)		+= phonet/
 ifneq ($(CONFIG_VLAN_8021Q),)
 obj-y				+= 8021q/
diff --git a/net/core/dev.c b/net/core/dev.c
index 716df64fcfa5..6847022b9d66 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10370,9 +10370,7 @@ void netdev_run_todo(void)
 		BUG_ON(!list_empty(&dev->ptype_specific));
 		WARN_ON(rcu_access_pointer(dev->ip_ptr));
 		WARN_ON(rcu_access_pointer(dev->ip6_ptr));
-#if IS_ENABLED(CONFIG_DECNET)
-		WARN_ON(dev->dn_ptr);
-#endif
+
 		if (dev->priv_destructor)
 			dev->priv_destructor(dev);
 		if (dev->needs_free_netdev)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 5b669eb80270..833d2214f36f 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1847,9 +1847,6 @@ static struct neigh_table *neigh_find_table(int family)
 	case AF_INET6:
 		tbl = neigh_tables[NEIGH_ND_TABLE];
 		break;
-	case AF_DECnet:
-		tbl = neigh_tables[NEIGH_DN_TABLE];
-		break;
 	}
 
 	return tbl;
diff --git a/net/decnet/Kconfig b/net/decnet/Kconfig
deleted file mode 100644
index 24336bdb1054..000000000000
--- a/net/decnet/Kconfig
+++ /dev/null
@@ -1,43 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-#
-# DECnet configuration
-#
-config DECNET
-	tristate "DECnet Support"
-	help
-	  The DECnet networking protocol was used in many products made by
-	  Digital (now Compaq).  It provides reliable stream and sequenced
-	  packet communications over which run a variety of services similar
-	  to those which run over TCP/IP.
-
-	  To find some tools to use with the kernel layer support, please
-	  look at Patrick Caulfield's web site:
-	  <http://linux-decnet.sourceforge.net/>.
-
-	  More detailed documentation is available in
-	  <file:Documentation/networking/decnet.rst>.
-
-	  Be sure to say Y to "/proc file system support" and "Sysctl support"
-	  below when using DECnet, since you will need sysctl support to aid
-	  in configuration at run time.
-
-	  The DECnet code is also available as a module ( = code which can be
-	  inserted in and removed from the running kernel whenever you want).
-	  The module is called decnet.
-
-config DECNET_ROUTER
-	bool "DECnet: router support"
-	depends on DECNET
-	select FIB_RULES
-	help
-	  Add support for turning your DECnet Endnode into a level 1 or 2
-	  router.  This is an experimental, but functional option.  If you
-	  do say Y here, then make sure that you also say Y to "Kernel/User
-	  network link driver", "Routing messages" and "Network packet
-	  filtering".  The first two are required to allow configuration via
-	  rtnetlink (you will need Alexey Kuznetsov's iproute2 package
-	  from <ftp://ftp.tux.org/pub/net/ip-routing/>). The "Network packet
-	  filtering" option will be required for the forthcoming routing daemon
-	  to work.
-
-	  See <file:Documentation/networking/decnet.rst> for more information.
diff --git a/net/decnet/Makefile b/net/decnet/Makefile
deleted file mode 100644
index 07b38e441b2d..000000000000
--- a/net/decnet/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-
-obj-$(CONFIG_DECNET) += decnet.o
-
-decnet-y := af_decnet.o dn_nsp_in.o dn_nsp_out.o \
-	    dn_route.o dn_dev.o dn_neigh.o dn_timer.o
-decnet-$(CONFIG_DECNET_ROUTER) += dn_fib.o dn_rules.o dn_table.o
-decnet-y += sysctl_net_decnet.o
-
-obj-$(CONFIG_NETFILTER) += netfilter/
diff --git a/net/decnet/README b/net/decnet/README
deleted file mode 100644
index 60e7ec88c81f..000000000000
--- a/net/decnet/README
+++ /dev/null
@@ -1,8 +0,0 @@
-                       Linux DECnet Project
-                      ======================
-
-The documentation for this kernel subsystem is available in the
-Documentation/networking subdirectory of this distribution and also
-on line at http://www.chygwyn.com/DECnet/
-
-Steve Whitehouse <SteveW@ACM.org>
diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
deleted file mode 100644
index 6582dfdfb932..000000000000
--- a/net/decnet/af_decnet.c
+++ /dev/null
@@ -1,2404 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-/*
- * 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
-
-
-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/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/signal.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_states.h>
-#include <net/flow.h>
-#include <asm/ioctls.h>
-#include <linux/capability.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 <linux/jiffies.h>
-#include <net/net_namespace.h>
-#include <net/neighbour.h>
-#include <net/dst.h>
-#include <net/fib_rules.h>
-#include <net/tcp.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 const 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 atomic_long_t decnet_memory_allocated;
-static DEFINE_PER_CPU(int, decnet_memory_per_cpu_fw_alloc);
-
-static int __dn_setsockopt(struct socket *sock, int level, int optname,
-		sockptr_t optval, unsigned 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[le16_to_cpu(scp->addrloc) & DN_SK_HASH_MASK];
-}
-
-/*
- * Valid ports are those greater than zero and not already in use.
- */
-static int check_port(__le16 port)
-{
-	struct sock *sk;
-
-	if (port == 0)
-		return -1;
-
-	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(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(cpu_to_le16(++port)) != 0) {
-		if (port == i_port)
-			return 0;
-	}
-
-	scp->addrloc = cpu_to_le16(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 int hash = addr->sdn_objnum;
-
-	if (hash == 0) {
-		hash = addr->sdn_objnamel;
-		for(i = 0; i < le16_to_cpu(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++ = le16_to_cpu(sdn->sdn_objnamel);
-		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
-		len = 3 + le16_to_cpu(sdn->sdn_objnamel);
-		break;
-	case 2:
-		memset(buf, 0, 5);
-		buf += 5;
-		*buf++ = le16_to_cpu(sdn->sdn_objnamel);
-		memcpy(buf, sdn->sdn_objname, le16_to_cpu(sdn->sdn_objnamel));
-		len = 7 + le16_to_cpu(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 = cpu_to_le16(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 = cpu_to_le16(*data++);
-	len -= le16_to_cpu(sdn->sdn_objnamel);
-
-	if ((len < 0) || (le16_to_cpu(sdn->sdn_objnamel) > namel))
-		return -1;
-
-	memcpy(sdn->sdn_objname, data, le16_to_cpu(sdn->sdn_objnamel));
-
-	return size - len;
-}
-
-struct sock *dn_sklist_find_listener(struct sockaddr_dn *addr)
-{
-	struct hlist_head *list = listen_hash(addr);
-	struct sock *sk;
-
-	read_lock(&dn_hash_lock);
-	sk_for_each(sk, 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, le16_to_cpu(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 dn_scp *scp;
-
-	read_lock(&dn_hash_lock);
-	sk_for_each(sk, &dn_sk_hash[le16_to_cpu(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(rcu_dereference_protected(sk->sk_dst_cache, 1));
-}
-
-static unsigned long dn_memory_pressure;
-
-static void dn_enter_memory_pressure(struct sock *sk)
-{
-	if (!dn_memory_pressure) {
-		dn_memory_pressure = 1;
-	}
-}
-
-static struct proto dn_proto = {
-	.name			= "NSP",
-	.owner			= THIS_MODULE,
-	.enter_memory_pressure	= dn_enter_memory_pressure,
-	.memory_pressure	= &dn_memory_pressure,
-
-	.memory_allocated	= &decnet_memory_allocated,
-	.per_cpu_fw_alloc	= &decnet_memory_per_cpu_fw_alloc,
-
-	.sysctl_mem		= sysctl_decnet_mem,
-	.sysctl_wmem		= sysctl_decnet_wmem,
-	.sysctl_rmem		= sysctl_decnet_rmem,
-	.max_header		= DN_MAX_NSP_DATA_HEADER + 64,
-	.obj_size		= sizeof(struct dn_sock),
-};
-
-static struct sock *dn_alloc_sock(struct net *net, struct socket *sock, gfp_t gfp, int kern)
-{
-	struct dn_scp *scp;
-	struct sock *sk = sk_alloc(net, PF_DECnet, gfp, &dn_proto, kern);
-
-	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_tx = 1;
-	sk->sk_family      = PF_DECnet;
-	sk->sk_protocol    = 0;
-	sk->sk_allocation  = gfp;
-	sk->sk_sndbuf	   = READ_ONCE(sysctl_decnet_wmem[1]);
-	sk->sk_rcvbuf	   = READ_ONCE(sysctl_decnet_rmem[1]);
-
-	/* 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;
-
-	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_empty(&scp->other_xmit_queue))
-		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 (time_after_eq(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;
-		fallthrough;
-	case DN_DI:
-	case DN_DR:
-disc_reject:
-		dn_nsp_send_disc(sk, NSP_DISCINIT, 0, sk->sk_allocation);
-		fallthrough;
-	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");
-		fallthrough;
-	case DN_O:
-		dn_stop_slow_timer(sk);
-
-		dn_unhash_sock_bh(sk);
-		sock_put(sk);
-
-		break;
-	}
-}
-
-char *dn_addr2asc(__u16 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 net *net, struct socket *sock, int protocol,
-		     int kern)
-{
-	struct sock *sk;
-
-	if (protocol < 0 || protocol > U8_MAX)
-		return -EINVAL;
-
-	if (!net_eq(net, &init_net))
-		return -EAFNOSUPPORT;
-
-	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(net, sock, GFP_KERNEL, kern)) == 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, *ldev;
-	int rv;
-
-	if (addr_len != sizeof(struct sockaddr_dn))
-		return -EINVAL;
-
-	if (saddr->sdn_family != AF_DECnet)
-		return -EINVAL;
-
-	if (le16_to_cpu(saddr->sdn_nodeaddrl) && (le16_to_cpu(saddr->sdn_nodeaddrl) != 2))
-		return -EINVAL;
-
-	if (le16_to_cpu(saddr->sdn_objnamel) > DN_MAXOBJL)
-		return -EINVAL;
-
-	if (saddr->sdn_flags & ~SDF_WILD)
-		return -EINVAL;
-
-	if (!capable(CAP_NET_BIND_SERVICE) && (saddr->sdn_objnum ||
-	    (saddr->sdn_flags & SDF_WILD)))
-		return -EACCES;
-
-	if (!(saddr->sdn_flags & SDF_WILD)) {
-		if (le16_to_cpu(saddr->sdn_nodeaddrl)) {
-			rcu_read_lock();
-			ldev = NULL;
-			for_each_netdev_rcu(&init_net, dev) {
-				if (!dev->dn_ptr)
-					continue;
-				if (dn_dev_islocal(dev, dn_saddr2dn(saddr))) {
-					ldev = dev;
-					break;
-				}
-			}
-			rcu_read_unlock();
-			if (ldev == 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);