Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2062 insertions, 0 deletions

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
new file mode 100644
index 000000000..7861f2747
--- /dev/null
+++ b/net/ax25/af_ax25.c
@@ -0,0 +1,2062 @@
+/*
+ * 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
+ * (at your option) any later version.
+ *
+ * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ * Copyright (C) Darryl Miles G7LED (dlm@g7led.demon.co.uk)
+ * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
+ * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
+ * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
+ * Copyright (C) Hans Alblas PE1AYX (hans@esrac.ele.tue.nl)
+ * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
+ */
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.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/slab.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <linux/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/termios.h>	/* For TIOCINQ/OUTQ */
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <net/net_namespace.h>
+#include <net/tcp_states.h>
+#include <net/ip.h>
+#include <net/arp.h>
+
+
+
+HLIST_HEAD(ax25_list);
+DEFINE_SPINLOCK(ax25_list_lock);
+
+static const struct proto_ops ax25_proto_ops;
+
+static void ax25_free_sock(struct sock *sk)
+{
+	ax25_cb_put(sk_to_ax25(sk));
+}
+
+/*
+ *	Socket removal during an interrupt is now safe.
+ */
+static void ax25_cb_del(ax25_cb *ax25)
+{
+	if (!hlist_unhashed(&ax25->ax25_node)) {
+		spin_lock_bh(&ax25_list_lock);
+		hlist_del_init(&ax25->ax25_node);
+		spin_unlock_bh(&ax25_list_lock);
+		ax25_cb_put(ax25);
+	}
+}
+
+/*
+ *	Kill all bound sockets on a dropped device.
+ */
+static void ax25_kill_by_device(struct net_device *dev)
+{
+	ax25_dev *ax25_dev;
+	ax25_cb *s;
+	struct sock *sk;
+
+	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+		return;
+
+	spin_lock_bh(&ax25_list_lock);
+again:
+	ax25_for_each(s, &ax25_list) {
+		if (s->ax25_dev == ax25_dev) {
+			sk = s->sk;
+			if (!sk) {
+				spin_unlock_bh(&ax25_list_lock);
+				ax25_disconnect(s, ENETUNREACH);
+				s->ax25_dev = NULL;
+				spin_lock_bh(&ax25_list_lock);
+				goto again;
+			}
+			sock_hold(sk);
+			spin_unlock_bh(&ax25_list_lock);
+			lock_sock(sk);
+			ax25_disconnect(s, ENETUNREACH);
+			s->ax25_dev = NULL;
+			if (sk->sk_socket) {
+				dev_put(ax25_dev->dev);
+				ax25_dev_put(ax25_dev);
+			}
+			release_sock(sk);
+			spin_lock_bh(&ax25_list_lock);
+			sock_put(sk);
+			/* The entry could have been deleted from the
+			 * list meanwhile and thus the next pointer is
+			 * no longer valid.  Play it safe and restart
+			 * the scan.  Forward progress is ensured
+			 * because we set s->ax25_dev to NULL and we
+			 * are never passed a NULL 'dev' argument.
+			 */
+			goto again;
+		}
+	}
+	spin_unlock_bh(&ax25_list_lock);
+}
+
+/*
+ *	Handle device status changes.
+ */
+static int ax25_device_event(struct notifier_block *this, unsigned long event,
+			     void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+
+	if (!net_eq(dev_net(dev), &init_net))
+		return NOTIFY_DONE;
+
+	/* Reject non AX.25 devices */
+	if (dev->type != ARPHRD_AX25)
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_UP:
+		ax25_dev_device_up(dev);
+		break;
+	case NETDEV_DOWN:
+		ax25_kill_by_device(dev);
+		ax25_rt_device_down(dev);
+		ax25_dev_device_down(dev);
+		break;
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Add a socket to the bound sockets list.
+ */
+void ax25_cb_add(ax25_cb *ax25)
+{
+	spin_lock_bh(&ax25_list_lock);
+	ax25_cb_hold(ax25);
+	hlist_add_head(&ax25->ax25_node, &ax25_list);
+	spin_unlock_bh(&ax25_list_lock);
+}
+
+/*
+ *	Find a socket that wants to accept the SABM we have just
+ *	received.
+ */
+struct sock *ax25_find_listener(ax25_address *addr, int digi,
+	struct net_device *dev, int type)
+{
+	ax25_cb *s;
+
+	spin_lock(&ax25_list_lock);
+	ax25_for_each(s, &ax25_list) {
+		if ((s->iamdigi && !digi) || (!s->iamdigi && digi))
+			continue;
+		if (s->sk && !ax25cmp(&s->source_addr, addr) &&
+		    s->sk->sk_type == type && s->sk->sk_state == TCP_LISTEN) {
+			/* If device is null we match any device */
+			if (s->ax25_dev == NULL || s->ax25_dev->dev == dev) {
+				sock_hold(s->sk);
+				spin_unlock(&ax25_list_lock);
+				return s->sk;
+			}
+		}
+	}
+	spin_unlock(&ax25_list_lock);
+
+	return NULL;
+}
+
+/*
+ *	Find an AX.25 socket given both ends.
+ */
+struct sock *ax25_get_socket(ax25_address *my_addr, ax25_address *dest_addr,
+	int type)
+{
+	struct sock *sk = NULL;
+	ax25_cb *s;
+
+	spin_lock(&ax25_list_lock);
+	ax25_for_each(s, &ax25_list) {
+		if (s->sk && !ax25cmp(&s->source_addr, my_addr) &&
+		    !ax25cmp(&s->dest_addr, dest_addr) &&
+		    s->sk->sk_type == type) {
+			sk = s->sk;
+			sock_hold(sk);
+			break;
+		}
+	}
+
+	spin_unlock(&ax25_list_lock);
+
+	return sk;
+}
+
+/*
+ *	Find an AX.25 control block given both ends. It will only pick up
+ *	floating AX.25 control blocks or non Raw socket bound control blocks.
+ */
+ax25_cb *ax25_find_cb(ax25_address *src_addr, ax25_address *dest_addr,
+	ax25_digi *digi, struct net_device *dev)
+{
+	ax25_cb *s;
+
+	spin_lock_bh(&ax25_list_lock);
+	ax25_for_each(s, &ax25_list) {
+		if (s->sk && s->sk->sk_type != SOCK_SEQPACKET)
+			continue;
+		if (s->ax25_dev == NULL)
+			continue;
+		if (ax25cmp(&s->source_addr, src_addr) == 0 && ax25cmp(&s->dest_addr, dest_addr) == 0 && s->ax25_dev->dev == dev) {
+			if (digi != NULL && digi->ndigi != 0) {
+				if (s->digipeat == NULL)
+					continue;
+				if (ax25digicmp(s->digipeat, digi) != 0)
+					continue;
+			} else {
+				if (s->digipeat != NULL && s->digipeat->ndigi != 0)
+					continue;
+			}
+			ax25_cb_hold(s);
+			spin_unlock_bh(&ax25_list_lock);
+
+			return s;
+		}
+	}
+	spin_unlock_bh(&ax25_list_lock);
+
+	return NULL;
+}
+
+EXPORT_SYMBOL(ax25_find_cb);
+
+void ax25_send_to_raw(ax25_address *addr, struct sk_buff *skb, int proto)
+{
+	ax25_cb *s;
+	struct sk_buff *copy;
+
+	spin_lock(&ax25_list_lock);
+	ax25_for_each(s, &ax25_list) {
+		if (s->sk != NULL && ax25cmp(&s->source_addr, addr) == 0 &&
+		    s->sk->sk_type == SOCK_RAW &&
+		    s->sk->sk_protocol == proto &&
+		    s->ax25_dev->dev == skb->dev &&
+		    atomic_read(&s->sk->sk_rmem_alloc) <= s->sk->sk_rcvbuf) {
+			if ((copy = skb_clone(skb, GFP_ATOMIC)) == NULL)
+				continue;
+			if (sock_queue_rcv_skb(s->sk, copy) != 0)
+				kfree_skb(copy);
+		}
+	}
+	spin_unlock(&ax25_list_lock);
+}
+
+/*
+ *	Deferred destroy.
+ */
+void ax25_destroy_socket(ax25_cb *);
+
+/*
+ *	Handler for deferred kills.
+ */
+static void ax25_destroy_timer(struct timer_list *t)
+{
+	ax25_cb *ax25 = from_timer(ax25, t, dtimer);
+	struct sock *sk;
+
+	sk=ax25->sk;
+
+	bh_lock_sock(sk);
+	sock_hold(sk);
+	ax25_destroy_socket(ax25);
+	bh_unlock_sock(sk);
+	sock_put(sk);
+}
+
+/*
+ *	This is called from user mode and the timers. Thus it protects itself
+ *	against interrupt users but doesn't worry about being called during
+ *	work. Once it is removed from the queue no interrupt or bottom half
+ *	will touch it and we are (fairly 8-) ) safe.
+ */
+void ax25_destroy_socket(ax25_cb *ax25)
+{
+	struct sk_buff *skb;
+
+	ax25_cb_del(ax25);
+
+	ax25_stop_heartbeat(ax25);
+	ax25_stop_t1timer(ax25);
+	ax25_stop_t2timer(ax25);
+	ax25_stop_t3timer(ax25);
+	ax25_stop_idletimer(ax25);
+
+	ax25_clear_queues(ax25);	/* Flush the queues */
+
+	if (ax25->sk != NULL) {
+		while ((skb = skb_dequeue(&ax25->sk->sk_receive_queue)) != NULL) {
+			if (skb->sk != ax25->sk) {
+				/* A pending connection */
+				ax25_cb *sax25 = sk_to_ax25(skb->sk);
+
+				/* Queue the unaccepted socket for death */
+				sock_orphan(skb->sk);
+
+				/* 9A4GL: hack to release unaccepted sockets */
+				skb->sk->sk_state = TCP_LISTEN;
+
+				ax25_start_heartbeat(sax25);
+				sax25->state = AX25_STATE_0;
+			}
+
+			kfree_skb(skb);
+		}
+		skb_queue_purge(&ax25->sk->sk_write_queue);
+	}
+
+	if (ax25->sk != NULL) {
+		if (sk_has_allocations(ax25->sk)) {
+			/* Defer: outstanding buffers */
+			timer_setup(&ax25->dtimer, ax25_destroy_timer, 0);
+			ax25->dtimer.expires  = jiffies + 2 * HZ;
+			add_timer(&ax25->dtimer);
+		} else {
+			struct sock *sk=ax25->sk;
+			ax25->sk=NULL;
+			sock_put(sk);
+		}
+	} else {
+		ax25_cb_put(ax25);
+	}
+}
+
+/*
+ * dl1bke 960311: set parameters for existing AX.25 connections,
+ *		  includes a KILL command to abort any connection.
+ *		  VERY useful for debugging ;-)
+ */
+static int ax25_ctl_ioctl(const unsigned int cmd, void __user *arg)
+{
+	struct ax25_ctl_struct ax25_ctl;
+	ax25_digi digi;
+	ax25_dev *ax25_dev;
+	ax25_cb *ax25;
+	unsigned int k;
+	int ret = 0;
+
+	if (copy_from_user(&ax25_ctl, arg, sizeof(ax25_ctl)))
+		return -EFAULT;
+
+	if (ax25_ctl.digi_count > AX25_MAX_DIGIS)
+		return -EINVAL;
+
+	if (ax25_ctl.arg > ULONG_MAX / HZ && ax25_ctl.cmd != AX25_KILL)
+		return -EINVAL;
+
+	ax25_dev = ax25_addr_ax25dev(&ax25_ctl.port_addr);
+	if (!ax25_dev)
+		return -ENODEV;
+
+	digi.ndigi = ax25_ctl.digi_count;
+	for (k = 0; k < digi.ndigi; k++)
+		digi.calls[k] = ax25_ctl.digi_addr[k];
+
+	ax25 = ax25_find_cb(&ax25_ctl.source_addr, &ax25_ctl.dest_addr, &digi, ax25_dev->dev);
+	if (!ax25) {
+		ax25_dev_put(ax25_dev);
+		return -ENOTCONN;
+	}
+
+	switch (ax25_ctl.cmd) {
+	case AX25_KILL:
+		ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+#ifdef CONFIG_AX25_DAMA_SLAVE
+		if (ax25_dev->dama.slave && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
+			ax25_dama_off(ax25);
+#endif
+		ax25_disconnect(ax25, ENETRESET);
+		break;
+
+	case AX25_WINDOW:
+		if (ax25->modulus == AX25_MODULUS) {
+			if (ax25_ctl.arg < 1 || ax25_ctl.arg > 7)
+				goto einval_put;
+		} else {
+			if (ax25_ctl.arg < 1 || ax25_ctl.arg > 63)
+				goto einval_put;
+		}
+		ax25->window = ax25_ctl.arg;
+		break;
+
+	case AX25_T1:
+		if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
+			goto einval_put;
+		ax25->rtt = (ax25_ctl.arg * HZ) / 2;
+		ax25->t1  = ax25_ctl.arg * HZ;
+		break;
+
+	case AX25_T2:
+		if (ax25_ctl.arg < 1 || ax25_ctl.arg > ULONG_MAX / HZ)
+			goto einval_put;
+		ax25->t2 = ax25_ctl.arg * HZ;
+		break;
+
+	case AX25_N2:
+		if (ax25_ctl.arg < 1 || ax25_ctl.arg > 31)
+			goto einval_put;
+		ax25->n2count = 0;
+		ax25->n2 = ax25_ctl.arg;
+		break;
+
+	case AX25_T3:
+		if (ax25_ctl.arg > ULONG_MAX / HZ)
+			goto einval_put;
+		ax25->t3 = ax25_ctl.arg * HZ;
+		break;
+
+	case AX25_IDLE:
+		if (ax25_ctl.arg > ULONG_MAX / (60 * HZ))
+			goto einval_put;
+
+		ax25->idle = ax25_ctl.arg * 60 * HZ;
+		break;
+
+	case AX25_PACLEN:
+		if (ax25_ctl.arg < 16 || ax25_ctl.arg > 65535)
+			goto einval_put;
+		ax25->paclen = ax25_ctl.arg;
+		break;
+
+	default:
+		goto einval_put;
+	  }
+
+out_put:
+	ax25_dev_put(ax25_dev);
+	ax25_cb_put(ax25);
+	return ret;
+
+einval_put:
+	ret = -EINVAL;
+	goto out_put;
+}
+
+static void ax25_fillin_cb_from_dev(ax25_cb *ax25, ax25_dev *ax25_dev)
+{
+	ax25->rtt     = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]) / 2;
+	ax25->t1      = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T1]);
+	ax25->t2      = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T2]);
+	ax25->t3      = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_T3]);
+	ax25->n2      = ax25_dev->values[AX25_VALUES_N2];
+	ax25->paclen  = ax25_dev->values[AX25_VALUES_PACLEN];
+	ax25->idle    = msecs_to_jiffies(ax25_dev->values[AX25_VALUES_IDLE]);
+	ax25->backoff = ax25_dev->values[AX25_VALUES_BACKOFF];
+
+	if (ax25_dev->values[AX25_VALUES_AXDEFMODE]) {
+		ax25->modulus = AX25_EMODULUS;
+		ax25->window  = ax25_dev->values[AX25_VALUES_EWINDOW];
+	} else {
+		ax25->modulus = AX25_MODULUS;
+		ax25->window  = ax25_dev->values[AX25_VALUES_WINDOW];
+	}
+}
+
+/*
+ *	Fill in a created AX.25 created control block with the default
+ *	values for a particular device.
+ */
+void ax25_fillin_cb(ax25_cb *ax25, ax25_dev *ax25_dev)
+{
+	ax25->ax25_dev = ax25_dev;
+
+	if (ax25->ax25_dev != NULL) {
+		ax25_fillin_cb_from_dev(ax25, ax25_dev);
+		return;
+	}
+
+	/*
+	 * No device, use kernel / AX.25 spec default values
+	 */
+	ax25->rtt     = msecs_to_jiffies(AX25_DEF_T1) / 2;
+	ax25->t1      = msecs_to_jiffies(AX25_DEF_T1);
+	ax25->t2      = msecs_to_jiffies(AX25_DEF_T2);
+	ax25->t3      = msecs_to_jiffies(AX25_DEF_T3);
+	ax25->n2      = AX25_DEF_N2;
+	ax25->paclen  = AX25_DEF_PACLEN;
+	ax25->idle    = msecs_to_jiffies(AX25_DEF_IDLE);
+	ax25->backoff = AX25_DEF_BACKOFF;
+
+	if (AX25_DEF_AXDEFMODE) {
+		ax25->modulus = AX25_EMODULUS;
+		ax25->window  = AX25_DEF_EWINDOW;
+	} else {
+		ax25->modulus = AX25_MODULUS;
+		ax25->window  = AX25_DEF_WINDOW;
+	}
+}
+
+/*
+ * Create an empty AX.25 control block.
+ */
+ax25_cb *ax25_create_cb(void)
+{
+	ax25_cb *ax25;
+
+	if ((ax25 = kzalloc(sizeof(*ax25), GFP_ATOMIC)) == NULL)
+		return NULL;
+
+	refcount_set(&ax25->refcount, 1);
+
+	skb_queue_head_init(&ax25->write_queue);
+	skb_queue_head_init(&ax25->frag_queue);
+	skb_queue_head_init(&ax25->ack_queue);
+	skb_queue_head_init(&ax25->reseq_queue);
+
+	ax25_setup_timers(ax25);
+
+	ax25_fillin_cb(ax25, NULL);
+
+	ax25->state = AX25_STATE_0;
+
+	return ax25;
+}
+
+/*
+ *	Handling for system calls applied via the various interfaces to an
+ *	AX25 socket object
+ */
+
+static int ax25_setsockopt(struct socket *sock, int level, int optname,
+	char __user *optval, unsigned int optlen)
+{
+	struct sock *sk = sock->sk;
+	ax25_cb *ax25;
+	struct net_device *dev;
+	char devname[IFNAMSIZ];
+	unsigned long opt;
+	int res = 0;
+
+	if (level != SOL_AX25)
+		return -ENOPROTOOPT;
+
+	if (optlen < sizeof(unsigned int))
+		return -EINVAL;
+
+	if (get_user(opt, (unsigned int __user *)optval))
+		return -EFAULT;
+
+	lock_sock(sk);
+	ax25 = sk_to_ax25(sk);
+
+	switch (optname) {
+	case AX25_WINDOW:
+		if (ax25->modulus == AX25_MODULUS) {
+			if (opt < 1 || opt > 7) {
+				res = -EINVAL;
+				break;
+			}
+		} else {
+			if (opt < 1 || opt > 63) {
+				res = -EINVAL;
+				break;
+			}
+		}
+		ax25->window = opt;
+		break;
+
+	case AX25_T1:
+		if (opt < 1 || opt > ULONG_MAX / HZ) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->rtt = (opt * HZ) >> 1;
+		ax25->t1  = opt * HZ;
+		break;
+
+	case AX25_T2:
+		if (opt < 1 || opt > ULONG_MAX / HZ) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->t2 = opt * HZ;
+		break;
+
+	case AX25_N2:
+		if (opt < 1 || opt > 31) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->n2 = opt;
+		break;
+
+	case AX25_T3:
+		if (opt < 1 || opt > ULONG_MAX / HZ) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->t3 = opt * HZ;
+		break;
+
+	case AX25_IDLE:
+		if (opt > ULONG_MAX / (60 * HZ)) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->idle = opt * 60 * HZ;
+		break;
+
+	case AX25_BACKOFF:
+		if (opt > 2) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->backoff = opt;
+		break;
+
+	case AX25_EXTSEQ:
+		ax25->modulus = opt ? AX25_EMODULUS : AX25_MODULUS;
+		break;
+
+	case AX25_PIDINCL:
+		ax25->pidincl = opt ? 1 : 0;
+		break;
+
+	case AX25_IAMDIGI:
+		ax25->iamdigi = opt ? 1 : 0;
+		break;
+
+	case AX25_PACLEN:
+		if (opt < 16 || opt > 65535) {
+			res = -EINVAL;
+			break;
+		}
+		ax25->paclen = opt;
+		break;
+
+	case SO_BINDTODEVICE:
+		if (optlen > IFNAMSIZ - 1)
+			optlen = IFNAMSIZ - 1;
+
+		memset(devname, 0, sizeof(devname));
+
+		if (copy_from_user(devname, optval, optlen)) {
+			res = -EFAULT;
+			break;
+		}
+
+		if (sk->sk_type == SOCK_SEQPACKET &&
+		   (sock->state != SS_UNCONNECTED ||
+		    sk->sk_state == TCP_LISTEN)) {
+			res = -EADDRNOTAVAIL;
+			break;
+		}
+
+		rtnl_lock();
+		dev = __dev_get_by_name(&init_net, devname);
+		if (!dev) {
+			rtnl_unlock();
+			res = -ENODEV;
+			break;
+		}
+
+		ax25->ax25_dev = ax25_dev_ax25dev(dev);
+		if (!ax25->ax25_dev) {
+			rtnl_unlock();
+			res = -ENODEV;
+			break;
+		}
+		ax25_fillin_cb(ax25, ax25->ax25_dev);
+		rtnl_unlock();
+		break;
+
+	default:
+		res = -ENOPROTOOPT;
+	}
+	release_sock(sk);
+
+	return res;
+}
+
+static int ax25_getsockopt(struct socket *sock, int level, int optname,
+	char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	ax25_cb *ax25;
+	struct ax25_dev *ax25_dev;
+	char devname[IFNAMSIZ];
+	void *valptr;
+	int val = 0;
+	int maxlen, length;
+
+	if (level != SOL_AX25)
+		return -ENOPROTOOPT;
+
+	if (get_user(maxlen, optlen))
+		return -EFAULT;
+
+	if (maxlen < 1)
+		return -EFAULT;
+
+	valptr = (void *) &val;
+	length = min_t(unsigned int, maxlen, sizeof(int));
+
+	lock_sock(sk);
+	ax25 = sk_to_ax25(sk);
+
+	switch (optname) {
+	case AX25_WINDOW:
+		val = ax25->window;
+		break;
+
+	case AX25_T1:
+		val = ax25->t1 / HZ;
+		break;
+
+	case AX25_T2:
+		val = ax25->t2 / HZ;
+		break;
+
+	case AX25_N2:
+		val = ax25->n2;
+		break;
+
+	case AX25_T3:
+		val = ax25->t3 / HZ;
+		break;
+
+	case AX25_IDLE:
+		val = ax25->idle / (60 * HZ);
+		break;
+
+	case AX25_BACKOFF:
+		val = ax25->backoff;
+		break;
+
+	case AX25_EXTSEQ:
+		val = (ax25->modulus == AX25_EMODULUS);
+		break;
+
+	case AX25_PIDINCL:
+		val = ax25->pidincl;
+		break;
+
+	case AX25_IAMDIGI:
+		val = ax25->iamdigi;
+		break;
+
+	case AX25_PACLEN:
+		val = ax25->paclen;
+		break;
+
+	case SO_BINDTODEVICE:
+		ax25_dev = ax25->ax25_dev;
+
+		if (ax25_dev != NULL && ax25_dev->dev != NULL) {
+			strlcpy(devname, ax25_dev->dev->name, sizeof(devname));
+			length = strlen(devname) + 1;
+		} else {
+			*devname = '\0';
+			length = 1;
+		}
+
+		valptr = (void *) devname;
+		break;
+
+	default:
+		release_sock(sk);
+		return -ENOPROTOOPT;
+	}
+	release_sock(sk);
+
+	if (put_user(length, optlen))
+		return -EFAULT;
+
+	return copy_to_user(optval, valptr, length) ? -EFAULT : 0;
+}
+
+static int ax25_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	int res = 0;
+
+	lock_sock(sk);
+	if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_LISTEN) {
+		sk->sk_max_ack_backlog = backlog;
+		sk->sk_state           = TCP_LISTEN;
+		goto out;
+	}
+	res = -EOPNOTSUPP;
+
+out:
+	release_sock(sk);
+
+	return res;
+}
+
+/*
+ * XXX: when creating ax25_sock we should update the .obj_size setting
+ * below.
+ */
+static struct proto ax25_proto = {
+	.name	  = "AX25",
+	.owner	  = THIS_MODULE,
+	.obj_size = sizeof(struct ax25_sock),
+};
+
+static int ax25_create(struct net *net, struct socket *sock, int protocol,
+		       int kern)
+{
+	struct sock *sk;
+	ax25_cb *ax25;
+
+	if (protocol < 0 || protocol > SK_PROTOCOL_MAX)
+		return -EINVAL;
+
+	if (!net_eq(net, &init_net))
+		return -EAFNOSUPPORT;
+
+	switch (sock->type) {
+	case SOCK_DGRAM:
+		if (protocol == 0 || protocol == PF_AX25)
+			protocol = AX25_P_TEXT;
+		break;
+
+	case SOCK_SEQPACKET:
+		switch (protocol) {
+		case 0:
+		case PF_AX25:	/* For CLX */
+			protocol = AX25_P_TEXT;
+			break;
+		case AX25_P_SEGMENT:
+#ifdef CONFIG_INET
+		case AX25_P_ARP:
+		case AX25_P_IP:
+#endif
+#ifdef CONFIG_NETROM
+		case AX25_P_NETROM:
+#endif
+#ifdef CONFIG_ROSE
+		case AX25_P_ROSE:
+#endif
+			return -ESOCKTNOSUPPORT;
+#ifdef CONFIG_NETROM_MODULE
+		case AX25_P_NETROM:
+			if (ax25_protocol_is_registered(AX25_P_NETROM))
+				return -ESOCKTNOSUPPORT;
+			break;
+#endif
+#ifdef CONFIG_ROSE_MODULE
+		case AX25_P_ROSE:
+			if (ax25_protocol_is_registered(AX25_P_ROSE))
+				return -ESOCKTNOSUPPORT;
+#endif
+		default:
+			break;
+		}
+		break;
+
+	case SOCK_RAW:
+		if (!capable(CAP_NET_RAW))
+			return -EPERM;
+		break;
+	default:
+		return -ESOCKTNOSUPPORT;
+	}
+
+	sk = sk_alloc(net, PF_AX25, GFP_ATOMIC, &ax25_proto, kern);
+	if (sk == NULL)
+		return -ENOMEM;
+
+	ax25 = ax25_sk(sk)->cb = ax25_create_cb();
+	if (!ax25) {
+		sk_free(sk);
+		return -ENOMEM;
+	}
+
+	sock_init_data(sock, sk);
+
+	sk->sk_destruct = ax25_free_sock;
+	sock->ops    = &ax25_proto_ops;
+	sk->sk_protocol = protocol;
+
+	ax25->sk    = sk;
+
+	return 0;
+}
+
+struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
+{
+	struct sock *sk;
+	ax25_cb *ax25, *oax25;
+
+	sk = sk_alloc(sock_net(osk), PF_AX25, GFP_ATOMIC, osk->sk_prot, 0);
+	if (sk == NULL)
+		return NULL;
+
+	if ((ax25 = ax25_create_cb()) == NULL) {
+		sk_free(sk);
+		return NULL;
+	}
+
+	switch (osk->sk_type) {
+	case SOCK_DGRAM:
+		break;
+	case SOCK_SEQPACKET:
+		break;
+	default:
+		sk_free(sk);
+		ax25_cb_put(ax25);
+		return NULL;
+	}
+
+	sock_init_data(NULL, sk);
+
+	sk->sk_type     = osk->sk_type;
+	sk->sk_priority = osk->sk_priority;
+	sk->sk_protocol = osk->sk_protocol;
+	sk->sk_rcvbuf   = osk->sk_rcvbuf;
+	sk->sk_sndbuf   = osk->sk_sndbuf;
+	sk->sk_state    = TCP_ESTABLISHED;
+	sock_copy_flags(sk, osk);
+
+	oax25 = sk_to_ax25(osk);
+
+	ax25->modulus = oax25->modulus;
+	ax25->backoff = oax25->backoff;
+	ax25->pidincl = oax25->pidincl;
+	ax25->iamdigi = oax25->iamdigi;
+	ax25->rtt     = oax25->rtt;
+	ax25->t1      = oax25->t1;
+	ax25->t2      = oax25->t2;
+	ax25->t3      = oax25->t3;
+	ax25->n2      = oax25->n2;
+	ax25->idle    = oax25->idle;
+	ax25->paclen  = oax25->paclen;
+	ax25->window  = oax25->window;
+
+	ax25->ax25_dev    = ax25_dev;
+	ax25->source_addr = oax25->source_addr;
+
+	if (oax25->digipeat != NULL) {
+		ax25->digipeat = kmemdup(oax25->digipeat, sizeof(ax25_digi),
+					 GFP_ATOMIC);
+		if (ax25->digipeat == NULL) {
+			sk_free(sk);
+			ax25_cb_put(ax25);
+			return NULL;
+		}
+	}
+
+	ax25_sk(sk)->cb = ax25;
+	sk->sk_destruct = ax25_free_sock;
+	ax25->sk    = sk;
+
+	return sk;
+}
+
+static int ax25_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+	ax25_cb *ax25;
+	ax25_dev *ax25_dev;
+
+	if (sk == NULL)
+		return 0;
+
+	sock_hold(sk);
+	lock_sock(sk);
+	sock_orphan(sk);
+	ax25 = sk_to_ax25(sk);
+	ax25_dev = ax25->ax25_dev;
+
+	if (sk->sk_type == SOCK_SEQPACKET) {
+		switch (ax25->state) {
+		case AX25_STATE_0:
+			release_sock(sk);
+			ax25_disconnect(ax25, 0);
+			lock_sock(sk);
+			ax25_destroy_socket(ax25);
+			break;
+
+		case AX25_STATE_1:
+		case AX25_STATE_2:
+			ax25_send_control(ax25, AX25_DISC, AX25_POLLON, AX25_COMMAND);
+			release_sock(sk);
+			ax25_disconnect(ax25, 0);
+			lock_sock(sk);
+			if (!sock_flag(ax25->sk, SOCK_DESTROY))
+				ax25_destroy_socket(ax25);
+			break;
+
+		case AX25_STATE_3:
+		case AX25_STATE_4:
+			ax25_clear_queues(ax25);
+			ax25->n2count = 0;
+
+			switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
+			case AX25_PROTO_STD_SIMPLEX:
+			case AX25_PROTO_STD_DUPLEX:
+				ax25_send_control(ax25,
+						  AX25_DISC,
+						  AX25_POLLON,
+						  AX25_COMMAND);
+				ax25_stop_t2timer(ax25);
+				ax25_stop_t3timer(ax25);
+				ax25_stop_idletimer(ax25);
+				break;
+#ifdef CONFIG_AX25_DAMA_SLAVE
+			case AX25_PROTO_DAMA_SLAVE:
+				ax25_stop_t3timer(ax25);
+				ax25_stop_idletimer(ax25);
+				break;
+#endif
+			}
+			ax25_calculate_t1(ax25);
+			ax25_start_t1timer(ax25);
+			ax25->state = AX25_STATE_2;
+			sk->sk_state                = TCP_CLOSE;
+			sk->sk_shutdown            |= SEND_SHUTDOWN;
+			sk->sk_state_change(sk);
+			sock_set_flag(sk, SOCK_DESTROY);
+			break;
+
+		default:
+			break;
+		}
+	} else {
+		sk->sk_state     = TCP_CLOSE;
+		sk->sk_shutdown |= SEND_SHUTDOWN;
+		sk->sk_state_change(sk);
+		ax25_destroy_socket(ax25);
+	}
+	if (ax25_dev) {
+		del_timer_sync(&ax25->timer);
+		del_timer_sync(&ax25->t1timer);
+		del_timer_sync(&ax25->t2timer);
+		del_timer_sync(&ax25->t3timer);
+		del_timer_sync(&ax25->idletimer);
+		dev_put(ax25_dev->dev);
+		ax25_dev_put(ax25_dev);
+	}
+
+	sock->sk   = NULL;
+	release_sock(sk);
+	sock_put(sk);
+
+	return 0;
+}
+
+/*
+ *	We support a funny extension here so you can (as root) give any callsign
+ *	digipeated via a local address as source. This hack is obsolete now
+ *	that we've implemented support for SO_BINDTODEVICE. It is however small
+ *	and trivially backward compatible.
+ */
+static int ax25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+	struct sock *sk = sock->sk;
+	struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
+	ax25_dev *ax25_dev = NULL;
+	ax25_uid_assoc *user;
+	ax25_address call;
+	ax25_cb *ax25;
+	int err = 0;
+
+	if (addr_len != sizeof(struct sockaddr_ax25) &&
+	    addr_len != sizeof(struct full_sockaddr_ax25))
+		/* support for old structure may go away some time
+		 * ax25_bind(): uses old (6 digipeater) socket structure.
+		 */
+		if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
+		    (addr_len > sizeof(struct full_sockaddr_ax25)))
+			return -EINVAL;
+
+	if (addr->fsa_ax25.sax25_family != AF_AX25)
+		return -EINVAL;
+
+	user = ax25_findbyuid(current_euid());
+	if (user) {
+		call = user->call;
+		ax25_uid_put(user);
+	} else {
+		if (ax25_uid_policy && !capable(CAP_NET_ADMIN))
+			return -EACCES;
+
+		call = addr->fsa_ax25.sax25_call;
+	}
+
+	lock_sock(sk);
+
+	ax25 = sk_to_ax25(sk);
+	if (!sock_flag(sk, SOCK_ZAPPED)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	ax25->source_addr = call;
+
+	/*
+	 * User already set interface with SO_BINDTODEVICE
+	 */
+	if (ax25->ax25_dev != NULL)
+		goto done;
+
+	if (addr_len > sizeof(struct sockaddr_ax25) && addr->fsa_ax25.sax25_ndigis == 1) {
+		if (ax25cmp(&addr->fsa_digipeater[0], &null_ax25_address) != 0 &&
+		    (ax25_dev = ax25_addr_ax25dev(&addr->fsa_digipeater[0])) == NULL) {
+			err = -EADDRNOTAVAIL;
+			goto out;
+		}
+	} else {
+		if ((ax25_dev = ax25_addr_ax25dev(&addr->fsa_ax25.sax25_call)) == NULL) {
+			err = -EADDRNOTAVAIL;
+			goto out;
+		}
+	}
+
+	if (ax25_dev) {
+		ax25_fillin_cb(ax25, ax25_dev);
+		dev_hold(ax25_dev->dev);
+	}
+
+done:
+	ax25_cb_add(ax25);
+	sock_reset_flag(sk, SOCK_ZAPPED);
+
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+/*
+ *	FIXME: nonblock behaviour looks like it may have a bug.
+ */
+static int __must_check ax25_connect(struct socket *sock,
+	struct sockaddr *uaddr, int addr_len, int flags)
+{
+	struct sock *sk = sock->sk;
+	ax25_cb *ax25 = sk_to_ax25(sk), *ax25t;
+	struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
+	ax25_digi *digi = NULL;
+	int ct = 0, err = 0;
+
+	/*
+	 * some sanity checks. code further down depends on this
+	 */
+
+	if (addr_len == sizeof(struct sockaddr_ax25))
+		/* support for this will go away in early 2.5.x
+		 * ax25_connect(): uses obsolete socket structure
+		 */
+		;
+	else if (addr_len != sizeof(struct full_sockaddr_ax25))
+		/* support for old structure may go away some time
+		 * ax25_connect(): uses old (6 digipeater) socket structure.
+		 */
+		if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
+		    (addr_len > sizeof(struct full_sockaddr_ax25)))
+			return -EINVAL;
+
+
+	if (fsa->fsa_ax25.sax25_family != AF_AX25)
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	/* deal with restarts */
+	if (sock->state == SS_CONNECTING) {
+		switch (sk->sk_state) {
+		case TCP_SYN_SENT: /* still trying */
+			err = -EINPROGRESS;
+			goto out_release;
+
+		case TCP_ESTABLISHED: /* connection established */
+			sock->state = SS_CONNECTED;
+			goto out_release;
+
+		case TCP_CLOSE: /* connection refused */
+			sock->state = SS_UNCONNECTED;
+			err = -ECONNREFUSED;
+			goto out_release;
+		}
+	}
+
+	if (sk->sk_state == TCP_ESTABLISHED && sk->sk_type == SOCK_SEQPACKET) {
+		err = -EISCONN;	/* No reconnect on a seqpacket socket */
+		goto out_release;
+	}
+
+	sk->sk_state   = TCP_CLOSE;
+	sock->state = SS_UNCONNECTED;
+
+	kfree(ax25->digipeat);
+	ax25->digipeat = NULL;
+
+	/*
+	 *	Handle digi-peaters to be used.
+	 */
+	if (addr_len > sizeof(struct sockaddr_ax25) &&
+	    fsa->fsa_ax25.sax25_ndigis != 0) {
+		/* Valid number of digipeaters ? */
+		if (fsa->fsa_ax25.sax25_ndigis < 1 ||
+		    fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS ||
+		    addr_len < sizeof(struct sockaddr_ax25) +
+		    sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) {
+			err = -EINVAL;
+			goto out_release;
+		}
+
+		if ((digi = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
+			err = -ENOBUFS;
+			goto out_release;
+		}
+
+		digi->ndigi      = fsa->fsa_ax25.sax25_ndigis;
+		digi->lastrepeat = -1;
+
+		while (ct < fsa->fsa_ax25.sax25_ndigis) {
+			if ((fsa->fsa_digipeater[ct].ax25_call[6] &
+			     AX25_HBIT) && ax25->iamdigi) {
+				digi->repeated[ct] = 1;
+				digi->lastrepeat   = ct;
+			} else {
+				digi->repeated[ct] = 0;
+			}
+			digi->calls[ct] = fsa->fsa_digipeater[ct];
+			ct++;
+		}
+	}
+
+	/*
+	 *	Must bind first - autobinding in this may or may not work. If
+	 *	the socket is already bound, check to see if the device has
+	 *	been filled in, error if it hasn't.
+	 */
+	if (sock_flag(sk, SOCK_ZAPPED)) {
+		/* check if we can remove this feature. It is broken. */
+		printk(KERN_WARNING "ax25_connect(): %s uses autobind, please contact jreuter@yaina.de\n",
+			current->comm);
+		if ((err = ax25_rt_autobind(ax25, &fsa->fsa_ax25.sax25_call)) < 0) {
+			kfree(digi);
+			goto out_release;
+		}
+
+		ax25_fillin_cb(ax25, ax25->ax25_dev);
+		ax25_cb_add(ax25);
+	} else {
+		if (ax25->ax25_dev == NULL) {
+			kfree(digi);
+			err = -EHOSTUNREACH;
+			goto out_release;
+		}
+	}
+
+	if (sk->sk_type == SOCK_SEQPACKET &&
+	    (ax25t=ax25_find_cb(&ax25->source_addr, &fsa->fsa_ax25.sax25_call, digi,
+			 ax25->ax25_dev->dev))) {
+		kfree(digi);
+		err = -EADDRINUSE;		/* Already such a connection */
+		ax25_cb_put(ax25t);
+		goto out_release;
+	}
+
+	ax25->dest_addr = fsa->fsa_ax25.sax25_call;
+	ax25->digipeat  = digi;
+
+	/* First the easy one */
+	if (sk->sk_type != SOCK_SEQPACKET) {
+		sock->state = SS_CONNECTED;
+		sk->sk_state   = TCP_ESTABLISHED;
+		goto out_release;
+	}
+
+	/* Move to connecting socket, ax.25 lapb WAIT_UA.. */
+	sock->state        = SS_CONNECTING;
+	sk->sk_state          = TCP_SYN_SENT;
+
+	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
+	case AX25_PROTO_STD_SIMPLEX:
+	case AX25_PROTO_STD_DUPLEX:
+		ax25_std_establish_data_link(ax25);
+		break;
+
+#ifdef CONFIG_AX25_DAMA_SLAVE
+	case AX25_PROTO_DAMA_SLAVE:
+		ax25->modulus = AX25_MODULUS;
+		ax25->window  = ax25->ax25_dev->values[AX25_VALUES_WINDOW];
+		if (ax25->ax25_dev->dama.slave)
+			ax25_ds_establish_data_link(ax25);
+		else
+			ax25_std_establish_data_link(ax25);
+		break;
+#endif
+	}
+
+	ax25->state = AX25_STATE_1;
+
+	ax25_start_heartbeat(ax25);
+
+	/* Now the loop */
+	if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK)) {
+		err = -EINPROGRESS;
+		goto out_release;
+	}
+
+	if (sk->sk_state == TCP_SYN_SENT) {
+		DEFINE_WAIT(wait);
+
+		for (;;) {
+			prepare_to_wait(sk_sleep(sk), &wait,
+					TASK_INTERRUPTIBLE);
+			if (sk->sk_state != TCP_SYN_SENT)
+				break;
+			if (!signal_pending(current)) {
+				release_sock(sk);
+				schedule();
+				lock_sock(sk);
+				continue;
+			}
+			err = -ERESTARTSYS;
+			break;
+		}
+		finish_wait(sk_sleep(sk), &wait);
+
+		if (err)
+			goto out_release;
+	}
+
+	if (sk->sk_state != TCP_ESTABLISHED) {
+		/* Not in ABM, not in WAIT_UA -> failed */
+		sock->state = SS_UNCONNECTED;
+		err = sock_error(sk);	/* Always set at this point */
+		goto out_release;
+	}
+
+	sock->state = SS_CONNECTED;
+
+	err = 0;
+out_release:
+	release_sock(sk);
+
+	return err;
+}
+
+static int ax25_accept(struct socket *sock, struct socket *newsock, int flags,
+		       bool kern)
+{
+	struct sk_buff *skb;
+	struct sock *newsk;
+	DEFINE_WAIT(wait);
+	struct sock *sk;
+	int err = 0;
+
+	if (sock->state != SS_UNCONNECTED)
+		return -EINVAL;
+
+	if ((sk = sock->sk) == NULL)
+		return -EINVAL;
+
+	lock_sock(sk);
+	if (sk->sk_type != SOCK_SEQPACKET) {
+		err = -EOPNOTSUPP;
+		goto out;
+	}
+
+	if (sk->sk_state != TCP_LISTEN) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	/*
+	 *	The read queue this time is holding sockets ready to use
+	 *	hooked into the SABM we saved
+	 */
+	for (;;) {
+		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+		skb = skb_dequeue(&sk->sk_receive_queue);
+		if (skb)
+			break;
+
+		if (flags & O_NONBLOCK) {
+			err = -EWOULDBLOCK;
+			break;
+		}
+		if (!signal_pending(current)) {
+			release_sock(sk);
+			schedule();
+			lock_sock(sk);
+			continue;
+		}
+		err = -ERESTARTSYS;
+		break;
+	}
+	finish_wait(sk_sleep(sk), &wait);
+
+	if (err)
+		goto out;
+
+	newsk		 = skb->sk;
+	sock_graft(newsk, newsock);
+
+	/* Now attach up the new socket */
+	kfree_skb(skb);
+	sk->sk_ack_backlog--;
+	newsock->state = SS_CONNECTED;
+
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+static int ax25_getname(struct socket *sock, struct sockaddr *uaddr,
+	int peer)
+{
+	struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)uaddr;
+	struct sock *sk = sock->sk;
+	unsigned char ndigi, i;
+	ax25_cb *ax25;
+	int err = 0;
+
+	memset(fsa, 0, sizeof(*fsa));
+	lock_sock(sk);
+	ax25 = sk_to_ax25(sk);
+
+	if (peer != 0) {
+		if (sk->sk_state != TCP_ESTABLISHED) {
+			err = -ENOTCONN;
+			goto out;
+		}
+
+		fsa->fsa_ax25.sax25_family = AF_AX25;
+		fsa->fsa_ax25.sax25_call   = ax25->dest_addr;
+
+		if (ax25->digipeat != NULL) {
+			ndigi = ax25->digipeat->ndigi;
+			fsa->fsa_ax25.sax25_ndigis = ndigi;
+			for (i = 0; i < ndigi; i++)
+				fsa->fsa_digipeater[i] =
+						ax25->digipeat->calls[i];
+		}
+	} else {
+		fsa->fsa_ax25.sax25_family = AF_AX25;
+		fsa->fsa_ax25.sax25_call   = ax25->source_addr;
+		fsa->fsa_ax25.sax25_ndigis = 1;
+		if (ax25->ax25_dev != NULL) {
+			memcpy(&fsa->fsa_digipeater[0],
+			       ax25->ax25_dev->dev->dev_addr, AX25_ADDR_LEN);
+		} else {
+			fsa->fsa_digipeater[0] = null_ax25_address;
+		}
+	}
+	err = sizeof (struct full_sockaddr_ax25);
+
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
+{
+	DECLARE_SOCKADDR(struct sockaddr_ax25 *, usax, msg->msg_name);
+	struct sock *sk = sock->sk;
+	struct sockaddr_ax25 sax;
+	struct sk_buff *skb;
+	ax25_digi dtmp, *dp;
+	ax25_cb *ax25;
+	size_t size;
+	int lv, err, addr_len = msg->msg_namelen;
+
+	if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
+		return -EINVAL;
+
+	lock_sock(sk);
+	ax25 = sk_to_ax25(sk);
+
+	if (sock_flag(sk, SOCK_ZAPPED)) {
+		err = -EADDRNOTAVAIL;
+		goto out;
+	}
+
+	if (sk->sk_shutdown & SEND_SHUTDOWN) {
+		send_sig(SIGPIPE, current, 0);
+		err = -EPIPE;
+		goto out;
+	}
+
+	if (ax25->ax25_dev == NULL) {
+		err = -ENETUNREACH;
+		goto out;
+	}
+
+	if (len > ax25->ax25_dev->dev->mtu) {
+		err = -EMSGSIZE;
+		goto out;
+	}
+
+	if (usax != NULL) {
+		if (usax->sax25_family != AF_AX25) {
+			err = -EINVAL;
+			goto out;
+		}
+
+		if (addr_len == sizeof(struct sockaddr_ax25))
+			/* ax25_sendmsg(): uses obsolete socket structure */
+			;
+		else if (addr_len != sizeof(struct full_sockaddr_ax25))
+			/* support for old structure may go away some time
+			 * ax25_sendmsg(): uses old (6 digipeater)
+			 * socket structure.
+			 */
+			if ((addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * 6) ||
+			    (addr_len > sizeof(struct full_sockaddr_ax25))) {
+				err = -EINVAL;
+				goto out;
+			}
+
+
+		if (addr_len > sizeof(struct sockaddr_ax25) && usax->sax25_ndigis != 0) {
+			int ct           = 0;
+			struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax;
+
+			/* Valid number of digipeaters ? */
+			if (usax->sax25_ndigis < 1 ||
+			    usax->sax25_ndigis > AX25_MAX_DIGIS ||
+			    addr_len < sizeof(struct sockaddr_ax25) +
+			    sizeof(ax25_address) * usax->sax25_ndigis) {
+				err = -EINVAL;
+				goto out;
+			}
+
+			dtmp.ndigi      = usax->sax25_ndigis;
+
+			while (ct < usax->sax25_ndigis) {
+				dtmp.repeated[ct] = 0;
+				dtmp.calls[ct]    = fsa->fsa_digipeater[ct];
+				ct++;
+			}
+
+			dtmp.lastrepeat = 0;
+		}
+
+		sax = *usax;
+		if (sk->sk_type == SOCK_SEQPACKET &&
+		    ax25cmp(&ax25->dest_addr, &sax.sax25_call)) {
+			err = -EISCONN;
+			goto out;
+		}
+		if (usax->sax25_ndigis == 0)
+			dp = NULL;
+		else
+			dp = &dtmp;
+	} else {
+		/*
+		 *	FIXME: 1003.1g - if the socket is like this because
+		 *	it has become closed (not started closed) and is VC
+		 *	we ought to SIGPIPE, EPIPE
+		 */
+		if (sk->sk_state != TCP_ESTABLISHED) {
+			err = -ENOTCONN;
+			goto out;
+		}
+		sax.sax25_family = AF_AX25;
+		sax.sax25_call   = ax25->dest_addr;
+		dp = ax25->digipeat;
+	}
+
+	/* Build a packet */
+	/* Assume the worst case */
+	size = len + ax25->ax25_dev->dev->hard_header_len;
+
+	skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, &err);
+	if (skb == NULL)
+		goto out;
+
+	skb_reserve(skb, size - len);
+
+	/* User data follows immediately after the AX.25 data */
+	if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
+		err = -EFAULT;
+		kfree_skb(skb);
+		goto out;
+	}
+
+	skb_reset_network_header(skb);
+
+	/* Add the PID if one is not supplied by the user in the skb */
+	if (!ax25->pidincl)
+		*(u8 *)skb_push(skb, 1) = sk->sk_protocol;
+
+	if (sk->sk_type == SOCK_SEQPACKET) {
+		/* Connected mode sockets go via the LAPB machine */
+		if (sk->sk_state != TCP_ESTABLISHED) {
+			kfree_skb(skb);
+			err = -ENOTCONN;
+			goto out;
+		}
+
+		/* Shove it onto the queue and kick */
+		ax25_output(ax25, ax25->paclen, skb);
+
+		err = len;
+		goto out;
+	}
+
+	skb_push(skb, 1 + ax25_addr_size(dp));
+
+	/* Building AX.25 Header */
+
+	/* Build an AX.25 header */
+	lv = ax25_addr_build(skb->data, &ax25->source_addr, &sax.sax25_call,
+			     dp, AX25_COMMAND, AX25_MODULUS);
+
+	skb_set_transport_header(skb, lv);
+
+	*skb_transport_header(skb) = AX25_UI;
+
+	/* Datagram frames go straight out of the door as UI */
+	ax25_queue_xmit(skb, ax25->ax25_dev->dev);
+
+	err = len;
+
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+static int ax25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
+			int flags)
+{
+	struct sock *sk = sock->sk;
+	struct sk_buff *skb;
+	int copied;
+	int err = 0;
+
+	lock_sock(sk);
+	/*
+	 * 	This works for seqpacket too. The receiver has ordered the
+	 *	queue for us! We do one quick check first though
+	 */
+	if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED) {
+		err =  -ENOTCONN;
+		goto out;
+	}
+
+	/* Now we can treat all alike */
+	skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
+				flags & MSG_DONTWAIT, &err);
+	if (skb == NULL)
+		goto out;
+
+	if (!sk_to_ax25(sk)->pidincl)
+		skb_pull(skb, 1);		/* Remove PID */
+
+	skb_reset_transport_header(skb);
+	copied = skb->len;
+
+	if (copied > size) {
+		copied = size;
+		msg->msg_flags |= MSG_TRUNC;
+	}
+
+	skb_copy_datagram_msg(skb, 0, msg, copied);
+
+	if (msg->msg_name) {
+		ax25_digi digi;
+		ax25_address src;
+		const unsigned char *mac = skb_mac_header(skb);
+		DECLARE_SOCKADDR(struct sockaddr_ax25 *, sax, msg->msg_name);
+
+		memset(sax, 0, sizeof(struct full_sockaddr_ax25));
+		ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL,
+				&digi, NULL, NULL);
+		sax->sax25_family = AF_AX25;
+		/* We set this correctly, even though we may not let the
+		   application know the digi calls further down (because it
+		   did NOT ask to know them).  This could get political... **/
+		sax->sax25_ndigis = digi.ndigi;
+		sax->sax25_call   = src;
+
+		if (sax->sax25_ndigis != 0) {
+			int ct;
+			struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)sax;
+
+			for (ct = 0; ct < digi.ndigi; ct++)
+				fsa->fsa_digipeater[ct] = digi.calls[ct];
+		}
+		msg->msg_namelen = sizeof(struct full_sockaddr_ax25);
+	}
+
+	skb_free_datagram(sk, skb);
+	err = copied;
+
+out:
+	release_sock(sk);
+
+	return err;
+}
+
+static int ax25_shutdown(struct socket *sk, int how)
+{
+	/* FIXME - generate DM and RNR states */
+	return -EOPNOTSUPP;
+}
+
+static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	struct sock *sk = sock->sk;
+	void __user *argp = (void __user *)arg;
+	int res = 0;
+
+	lock_sock(sk);
+	switch (cmd) {
+	case TIOCOUTQ: {
+		long amount;
+
+		amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
+		if (amount < 0)
+			amount = 0;
+		res = put_user(amount, (int __user *)argp);
+		break;
+	}
+
+	case TIOCINQ: {
+		struct sk_buff *skb;
+		long amount = 0L;
+		/* These two are safe on a single CPU system as only user tasks fiddle here */
+		if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
+			amount = skb->len;
+		res = put_user(amount, (int __user *) argp);
+		break;
+	}
+
+	case SIOCGSTAMP:
+		res = sock_get_timestamp(sk, argp);
+		break;
+
+	case SIOCGSTAMPNS:
+		res = sock_get_timestampns(sk, argp);
+		break;
+
+	case SIOCAX25ADDUID:	/* Add a uid to the uid/call map table */
+	case SIOCAX25DELUID:	/* Delete a uid from the uid/call map table */
+	case SIOCAX25GETUID: {
+		struct sockaddr_ax25 sax25;
+		if (copy_from_user(&sax25, argp, sizeof(sax25))) {
+			res = -EFAULT;
+			break;
+		}
+		res = ax25_uid_ioctl(cmd, &sax25);
+		break;
+	}
+
+	case SIOCAX25NOUID: {	/* Set the default policy (default/bar) */
+		long amount;
+		if (!capable(CAP_NET_ADMIN)) {
+			res = -EPERM;
+			break;
+		}
+		if (get_user(amount, (long __user *)argp)) {
+			res = -EFAULT;
+			break;
+		}
+		if (amount < 0 || amount > AX25_NOUID_BLOCK) {
+			res = -EINVAL;
+			break;
+		}
+		ax25_uid_policy = amount;
+		res = 0;
+		break;
+	}
+
+	case SIOCADDRT:
+	case SIOCDELRT:
+	case SIOCAX25OPTRT:
+		if (!capable(CAP_NET_ADMIN)) {
+			res = -EPERM;
+			break;
+		}
+		res = ax25_rt_ioctl(cmd, argp);
+		break;
+
+	case SIOCAX25CTLCON:
+		if (!capable(CAP_NET_ADMIN)) {
+			res = -EPERM;
+			break;
+		}
+		res = ax25_ctl_ioctl(cmd, argp);
+		break;
+
+	case SIOCAX25GETINFO:
+	case SIOCAX25GETINFOOLD: {
+		ax25_cb *ax25 = sk_to_ax25(sk);
+		struct ax25_info_struct ax25_info;
+
+		ax25_info.t1        = ax25->t1   / HZ;
+		ax25_info.t2        = ax25->t2   / HZ;
+		ax25_info.t3        = ax25->t3   / HZ;
+		ax25_info.idle      = ax25->idle / (60 * HZ);
+		ax25_info.n2        = ax25->n2;
+		ax25_info.t1timer   = ax25_display_timer(&ax25->t1timer)   / HZ;
+		ax25_info.t2timer   = ax25_display_timer(&ax25->t2timer)   / HZ;
+		ax25_info.t3timer   = ax25_display_timer(&ax25->t3timer)   / HZ;
+		ax25_info.idletimer = ax25_display_timer(&ax25->idletimer) / (60 * HZ);
+		ax25_info.n2count   = ax25->n2count;
+		ax25_info.state     = ax25->state;
+		ax25_info.rcv_q     = sk_rmem_alloc_get(sk);
+		ax25_info.snd_q     = sk_wmem_alloc_get(sk);
+		ax25_info.vs        = ax25->vs;
+		ax25_info.vr        = ax25->vr;
+		ax25_info.va        = ax25->va;
+		ax25_info.vs_max    = ax25->vs; /* reserved */
+		ax25_info.paclen    = ax25->paclen;
+		ax25_info.window    = ax25->window;
+
+		/* old structure? */
+		if (cmd == SIOCAX25GETINFOOLD) {
+			static int warned = 0;
+			if (!warned) {
+				printk(KERN_INFO "%s uses old SIOCAX25GETINFO\n",
+					current->comm);
+				warned=1;
+			}
+
+			if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct_deprecated))) {
+				res = -EFAULT;
+				break;
+			}
+		} else {
+			if (copy_to_user(argp, &ax25_info, sizeof(struct ax25_info_struct))) {
+				res = -EINVAL;
+				break;
+			}
+		}
+		res = 0;
+		break;
+	}
+
+	case SIOCAX25ADDFWD:
+	case SIOCAX25DELFWD: {
+		struct ax25_fwd_struct ax25_fwd;
+		if (!capable(CAP_NET_ADMIN)) {
+			res = -EPERM;
+			break;
+		}
+		if (copy_from_user(&ax25_fwd, argp, sizeof(ax25_fwd))) {
+			res = -EFAULT;
+			break;
+		}
+		res = ax25_fwd_ioctl(cmd, &ax25_fwd);
+		break;
+	}
+
+	case SIOCGIFADDR:
+	case SIOCSIFADDR:
+	case SIOCGIFDSTADDR:
+	case SIOCSIFDSTADDR:
+	case SIOCGIFBRDADDR:
+	case SIOCSIFBRDADDR:
+	case SIOCGIFNETMASK:
+	case SIOCSIFNETMASK:
+	case SIOCGIFMETRIC:
+	case SIOCSIFMETRIC:
+		res = -EINVAL;
+		break;
+
+	default:
+		res = -ENOIOCTLCMD;
+		break;
+	}
+	release_sock(sk);
+
+	return res;
+}
+
+#ifdef CONFIG_PROC_FS
+
+static void *ax25_info_start(struct seq_file *seq, loff_t *pos)
+	__acquires(ax25_list_lock)
+{
+	spin_lock_bh(&ax25_list_lock);
+	return seq_hlist_start(&ax25_list, *pos);
+}
+
+static void *ax25_info_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return seq_hlist_next(v, &ax25_list, pos);
+}
+
+static void ax25_info_stop(struct seq_file *seq, void *v)
+	__releases(ax25_list_lock)
+{
+	spin_unlock_bh(&ax25_list_lock);
+}
+
+static int ax25_info_show(struct seq_file *seq, void *v)
+{
+	ax25_cb *ax25 = hlist_entry(v, struct ax25_cb, ax25_node);
+	char buf[11];
+	int k;
+
+
+	/*
+	 * New format:
+	 * magic dev src_addr dest_addr,digi1,digi2,.. st vs vr va t1 t1 t2 t2 t3 t3 idle idle n2 n2 rtt window paclen Snd-Q Rcv-Q inode
+	 */
+
+	seq_printf(seq, "%8.8lx %s %s%s ",
+		   (long) ax25,
+		   ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
+		   ax2asc(buf, &ax25->source_addr),
+		   ax25->iamdigi? "*":"");
+	seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
+
+	for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
+		seq_printf(seq, ",%s%s",
+			   ax2asc(buf, &ax25->digipeat->calls[k]),
+			   ax25->digipeat->repeated[k]? "*":"");
+	}
+
+	seq_printf(seq, " %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %lu %d %d %lu %d %d",
+		   ax25->state,
+		   ax25->vs, ax25->vr, ax25->va,
+		   ax25_display_timer(&ax25->t1timer) / HZ, ax25->t1 / HZ,
+		   ax25_display_timer(&ax25->t2timer) / HZ, ax25->t2 / HZ,
+		   ax25_display_timer(&ax25->t3timer) / HZ, ax25->t3 / HZ,
+		   ax25_display_timer(&ax25->idletimer) / (60 * HZ),
+		   ax25->idle / (60 * HZ),
+		   ax25->n2count, ax25->n2,
+		   ax25->rtt / HZ,
+		   ax25->window,
+		   ax25->paclen);
+
+	if (ax25->sk != NULL) {
+		seq_printf(seq, " %d %d %lu\n",
+			   sk_wmem_alloc_get(ax25->sk),
+			   sk_rmem_alloc_get(ax25->sk),
+			   sock_i_ino(ax25->sk));
+	} else {
+		seq_puts(seq, " * * *\n");
+	}
+	return 0;
+}
+
+static const struct seq_operations ax25_info_seqops = {
+	.start = ax25_info_start,
+	.next = ax25_info_next,
+	.stop = ax25_info_stop,
+	.show = ax25_info_show,
+};
+#endif
+
+static const struct net_proto_family ax25_family_ops = {
+	.family =	PF_AX25,
+	.create =	ax25_create,
+	.owner	=	THIS_MODULE,
+};
+
+static const struct proto_ops ax25_proto_ops = {
+	.family		= PF_AX25,
+	.owner		= THIS_MODULE,
+	.release	= ax25_release,
+	.bind		= ax25_bind,
+	.connect	= ax25_connect,
+	.socketpair	= sock_no_socketpair,
+	.accept		= ax25_accept,
+	.getname	= ax25_getname,
+	.poll		= datagram_poll,
+	.ioctl		= ax25_ioctl,
+	.listen		= ax25_listen,
+	.shutdown	= ax25_shutdown,
+	.setsockopt	= ax25_setsockopt,
+	.getsockopt	= ax25_getsockopt,
+	.sendmsg	= ax25_sendmsg,
+	.recvmsg	= ax25_recvmsg,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage,
+};
+
+/*
+ *	Called by socket.c on kernel start up
+ */
+static struct packet_type ax25_packet_type __read_mostly = {
+	.type	=	cpu_to_be16(ETH_P_AX25),
+	.func	=	ax25_kiss_rcv,
+};
+
+static struct notifier_block ax25_dev_notifier = {
+	.notifier_call = ax25_device_event,
+};
+
+static int __init ax25_init(void)
+{
+	int rc = proto_register(&ax25_proto, 0);
+
+	if (rc != 0)
+		goto out;
+
+	sock_register(&ax25_family_ops);
+	dev_add_pack(&ax25_packet_type);
+	register_netdevice_notifier(&ax25_dev_notifier);
+
+	proc_create_seq("ax25_route", 0444, init_net.proc_net, &ax25_rt_seqops);
+	proc_create_seq("ax25", 0444, init_net.proc_net, &ax25_info_seqops);
+	proc_create_seq("ax25_calls", 0444, init_net.proc_net,
+			&ax25_uid_seqops);
+out:
+	return rc;
+}
+module_init(ax25_init);
+
+
+MODULE_AUTHOR("Jonathan Naylor G4KLX <g4klx@g4klx.demon.co.uk>");
+MODULE_DESCRIPTION("The amateur radio AX.25 link layer protocol");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NETPROTO(PF_AX25);
+
+static void __exit ax25_exit(void)
+{
+	remove_proc_entry("ax25_route", init_net.proc_net);
+	remove_proc_entry("ax25", init_net.proc_net);
+	remove_proc_entry("ax25_calls", init_net.proc_net);
+
+	unregister_netdevice_notifier(&ax25_dev_notifier);
+
+	dev_remove_pack(&ax25_packet_type);
+
+	sock_unregister(PF_AX25);
+	proto_unregister(&ax25_proto);
+
+	ax25_rt_free();
+	ax25_uid_free();
+	ax25_dev_free();
+}
+module_exit(ax25_exit);