Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

Documentation/connector/cn_test.c

···
+/*
+ * 	cn_test.c
+ * 
+ * 2004-2005 Copyright (c) Evgeniy Polyakov <[e-mail]>
+ * All rights reserved.
+ * 
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/skbuff.h>
+#include <linux/timer.h>
+
+#include "connector.h"
+
+static struct cb_id cn_test_id = { 0x123, 0x456 };
+static char cn_test_name[] = "cn_test";
+static struct sock *nls;
+static struct timer_list cn_test_timer;
+
+void cn_test_callback(void *data)
+{
+	struct cn_msg *msg = (struct cn_msg *)data;
+
+	printk("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
+	       __func__, jiffies, msg->id.idx, msg->id.val,
+	       msg->seq, msg->ack, msg->len, (char *)msg->data);
+}
+
+static int cn_test_want_notify(void)
+{
+	struct cn_ctl_msg *ctl;
+	struct cn_notify_req *req;
+	struct cn_msg *msg = NULL;
+	int size, size0;
+	struct sk_buff *skb;
+	struct nlmsghdr *nlh;
+	u32 group = 1;
+
+	size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
+
+	size = NLMSG_SPACE(size0);
+
+	skb = alloc_skb(size, GFP_ATOMIC);
+	if (!skb) {
+		printk(KERN_ERR "Failed to allocate new skb with size=%u.\n",
+		       size);
+
+		return -ENOMEM;
+	}
+
+	nlh = NLMSG_PUT(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh));
+
+	msg = (struct cn_msg *)NLMSG_DATA(nlh);
+
+	memset(msg, 0, size0);
+
+	msg->id.idx = -1;
+	msg->id.val = -1;
+	msg->seq = 0x123;
+	msg->ack = 0x345;
+	msg->len = size0 - sizeof(*msg);
+
+	ctl = (struct cn_ctl_msg *)(msg + 1);
+
+	ctl->idx_notify_num = 1;
+	ctl->val_notify_num = 2;
+	ctl->group = group;
+	ctl->len = msg->len - sizeof(*ctl);
+
+	req = (struct cn_notify_req *)(ctl + 1);
+
+	/*
+	 * Idx.
+	 */
+	req->first = cn_test_id.idx;
+	req->range = 10;
+
+	/*
+	 * Val 0.
+	 */
+	req++;
+	req->first = cn_test_id.val;
+	req->range = 10;
+
+	/*
+	 * Val 1.
+	 */
+	req++;
+	req->first = cn_test_id.val + 20;
+	req->range = 10;
+
+	NETLINK_CB(skb).dst_groups = ctl->group;
+	//netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
+	netlink_unicast(nls, skb, 0, 0);
+
+	printk(KERN_INFO "Request was sent. Group=0x%x.\n", ctl->group);
+
+	return 0;
+
+nlmsg_failure:
+	printk(KERN_ERR "Failed to send %u.%u\n", msg->seq, msg->ack);
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+static u32 cn_test_timer_counter;
+static void cn_test_timer_func(unsigned long __data)
+{
+	struct cn_msg *m;
+	char data[32];
+
+	m = kmalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
+	if (m) {
+		memset(m, 0, sizeof(*m) + sizeof(data));
+
+		memcpy(&m->id, &cn_test_id, sizeof(m->id));
+		m->seq = cn_test_timer_counter;
+		m->len = sizeof(data);
+
+		m->len =
+		    scnprintf(data, sizeof(data), "counter = %u",
+			      cn_test_timer_counter) + 1;
+
+		memcpy(m + 1, data, m->len);
+
+		cn_netlink_send(m, 0, gfp_any());
+		kfree(m);
+	}
+
+	cn_test_timer_counter++;
+
+	mod_timer(&cn_test_timer, jiffies + HZ);
+}
+
+static int cn_test_init(void)
+{
+	int err;
+
+	err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
+	if (err)
+		goto err_out;
+	cn_test_id.val++;
+	err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
+	if (err) {
+		cn_del_callback(&cn_test_id);
+		goto err_out;
+	}
+
+	init_timer(&cn_test_timer);
+	cn_test_timer.function = cn_test_timer_func;
+	cn_test_timer.expires = jiffies + HZ;
+	cn_test_timer.data = 0;
+	add_timer(&cn_test_timer);
+
+	return 0;
+
+      err_out:
+	if (nls && nls->sk_socket)
+		sock_release(nls->sk_socket);
+
+	return err;
+}
+
+static void cn_test_fini(void)
+{
+	del_timer_sync(&cn_test_timer);
+	cn_del_callback(&cn_test_id);
+	cn_test_id.val--;
+	cn_del_callback(&cn_test_id);
+	if (nls && nls->sk_socket)
+		sock_release(nls->sk_socket);
+}
+
+module_init(cn_test_init);
+module_exit(cn_test_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Evgeniy Polyakov <[e-mail]>");
+MODULE_DESCRIPTION("Connector's test module");

Documentation/connector/connector.txt

···
+/*****************************************/
+Kernel Connector.
+/*****************************************/
+
+Kernel connector - new netlink based userspace <-> kernel space easy
+to use communication module.
+
+Connector driver adds possibility to connect various agents using
+netlink based network.  One must register callback and
+identifier. When driver receives special netlink message with
+appropriate identifier, appropriate callback will be called.
+
+From the userspace point of view it's quite straightforward:
+
+	socket();
+	bind();
+	send();
+	recv();
+
+But if kernelspace want to use full power of such connections, driver
+writer must create special sockets, must know about struct sk_buff
+handling...  Connector allows any kernelspace agents to use netlink
+based networking for inter-process communication in a significantly
+easier way:
+
+int cn_add_callback(struct cb_id *id, char *name, void (*callback) (void *));
+void cn_netlink_send(struct cn_msg *msg, u32 __group, int gfp_mask);
+
+struct cb_id
+{
+	__u32			idx;
+	__u32			val;
+};
+
+idx and val are unique identifiers which must be registered in
+connector.h for in-kernel usage.  void (*callback) (void *) - is a
+callback function which will be called when message with above idx.val
+will be received by connector core.  Argument for that function must
+be dereferenced to struct cn_msg *.
+
+struct cn_msg
+{
+	struct cb_id 		id;
+
+	__u32			seq;
+	__u32			ack;
+
+	__u32			len;		/* Length of the following data */
+	__u8			data[0];
+};
+
+/*****************************************/
+Connector interfaces.
+/*****************************************/
+
+int cn_add_callback(struct cb_id *id, char *name, void (*callback) (void *));
+
+Registers new callback with connector core.
+
+struct cb_id *id 		- unique connector's user identifier.
+			  	  It must be registered in connector.h for legal in-kernel users.
+char *name 			- connector's callback symbolic name.
+void (*callback) (void *)	- connector's callback.
+				  Argument must be dereferenced to struct cn_msg *.
+
+void cn_del_callback(struct cb_id *id);
+
+Unregisters new callback with connector core.
+
+struct cb_id *id 		- unique connector's user identifier.
+
+void cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask);
+
+Sends message to the specified groups.  It can be safely called from
+any context, but may silently fail under strong memory pressure.
+
+struct cn_msg *			- message header(with attached data).
+u32 __group			- destination group.
+				  If __group is zero, then appropriate group will
+				  be searched through all registered connector users,
+				  and message will be delivered to the group which was
+				  created for user with the same ID as in msg.
+				  If __group is not zero, then message will be delivered
+				  to the specified group.
+int gfp_mask			- GFP mask.
+
+Note: When registering new callback user, connector core assigns
+netlink group to the user which is equal to it's id.idx.
+
+/*****************************************/
+Protocol description.
+/*****************************************/
+
+Current offers transport layer with fixed header.  Recommended
+protocol which uses such header is following:
+
+msg->seq and msg->ack are used to determine message genealogy.  When
+someone sends message it puts there locally unique sequence and random
+acknowledge numbers.  Sequence number may be copied into
+nlmsghdr->nlmsg_seq too.
+
+Sequence number is incremented with each message to be sent.
+
+If we expect reply to our message, then sequence number in received
+message MUST be the same as in original message, and acknowledge
+number MUST be the same + 1.
+
+If we receive message and it's sequence number is not equal to one we
+are expecting, then it is new message.  If we receive message and it's
+sequence number is the same as one we are expecting, but it's
+acknowledge is not equal acknowledge number in original message + 1,
+then it is new message.
+
+Obviously, protocol header contains above id.
+
+connector allows event notification in the following form: kernel
+driver or userspace process can ask connector to notify it when
+selected id's will be turned on or off(registered or unregistered it's
+callback). It is done by sending special command to connector
+driver(it also registers itself with id={-1, -1}).
+
+As example of usage Documentation/connector now contains cn_test.c -
+testing module which uses connector to request notification and to
+send messages.
+
+/*****************************************/
+Reliability.
+/*****************************************/
+
+Netlink itself is not reliable protocol, that means that messages can
+be lost due to memory pressure or process' receiving queue overflowed,
+so caller is warned must be prepared. That is why struct cn_msg [main
+connector's message header] contains u32 seq and u32 ack fields.

drivers/Kconfig

···
 
 source "drivers/base/Kconfig"
 
+source "drivers/connector/Kconfig"
+
 source "drivers/mtd/Kconfig"
 
 source "drivers/parport/Kconfig"

drivers/Makefile

···
 # default.
 obj-y				+= char/
 
+obj-$(CONFIG_CONNECTOR)		+= connector/
+
 # i810fb and intelfb depend on char/agp/
 obj-$(CONFIG_FB_I810)           += video/i810/
 obj-$(CONFIG_FB_INTEL)          += video/intelfb/

drivers/connector/Kconfig

···
+menu "Connector - unified userspace <-> kernelspace linker"
+
+config CONNECTOR
+	tristate "Connector - unified userspace <-> kernelspace linker"
+	depends on NET
+	---help---
+	  This is unified userspace <-> kernelspace connector working on top
+	  of the netlink socket protocol.
+
+	  Connector support can also be built as a module.  If so, the module
+	  will be called cn.ko.
+
+endmenu

drivers/connector/Makefile

···
+obj-$(CONFIG_CONNECTOR)		+= cn.o
+
+cn-y				+= cn_queue.o connector.o

drivers/connector/cn_queue.c

···
+/*
+ * 	cn_queue.c
+ * 
+ * 2004-2005 Copyright (c) Evgeniy Polyakov <[e-mail]>
+ * All rights reserved.
+ * 
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/suspend.h>
+#include <linux/connector.h>
+#include <linux/delay.h>
+
+static void cn_queue_wrapper(void *data)
+{
+	struct cn_callback_entry *cbq = data;
+
+	cbq->cb->callback(cbq->cb->priv);
+	cbq->destruct_data(cbq->ddata);
+	cbq->ddata = NULL;
+}
+
+static struct cn_callback_entry *cn_queue_alloc_callback_entry(struct cn_callback *cb)
+{
+	struct cn_callback_entry *cbq;
+
+	cbq = kzalloc(sizeof(*cbq), GFP_KERNEL);
+	if (!cbq) {
+		printk(KERN_ERR "Failed to create new callback queue.\n");
+		return NULL;
+	}
+
+	cbq->cb = cb;
+	INIT_WORK(&cbq->work, &cn_queue_wrapper, cbq);
+	return cbq;
+}
+
+static void cn_queue_free_callback(struct cn_callback_entry *cbq)
+{
+	cancel_delayed_work(&cbq->work);
+	flush_workqueue(cbq->pdev->cn_queue);
+
+	kfree(cbq);
+}
+
+int cn_cb_equal(struct cb_id *i1, struct cb_id *i2)
+{
+	return ((i1->idx == i2->idx) && (i1->val == i2->val));
+}
+
+int cn_queue_add_callback(struct cn_queue_dev *dev, struct cn_callback *cb)
+{
+	struct cn_callback_entry *cbq, *__cbq;
+	int found = 0;
+
+	cbq = cn_queue_alloc_callback_entry(cb);
+	if (!cbq)
+		return -ENOMEM;
+
+	atomic_inc(&dev->refcnt);
+	cbq->pdev = dev;
+
+	spin_lock_bh(&dev->queue_lock);
+	list_for_each_entry(__cbq, &dev->queue_list, callback_entry) {
+		if (cn_cb_equal(&__cbq->cb->id, &cb->id)) {
+			found = 1;
+			break;
+		}
+	}
+	if (!found)
+		list_add_tail(&cbq->callback_entry, &dev->queue_list);
+	spin_unlock_bh(&dev->queue_lock);
+
+	if (found) {
+		atomic_dec(&dev->refcnt);
+		cn_queue_free_callback(cbq);
+		return -EINVAL;
+	}
+
+	cbq->nls = dev->nls;
+	cbq->seq = 0;
+	cbq->group = cbq->cb->id.idx;
+
+	return 0;
+}
+
+void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id)
+{
+	struct cn_callback_entry *cbq, *n;
+	int found = 0;
+
+	spin_lock_bh(&dev->queue_lock);
+	list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) {
+		if (cn_cb_equal(&cbq->cb->id, id)) {
+			list_del(&cbq->callback_entry);
+			found = 1;
+			break;
+		}
+	}
+	spin_unlock_bh(&dev->queue_lock);
+
+	if (found) {
+		cn_queue_free_callback(cbq);
+		atomic_dec_and_test(&dev->refcnt);
+	}
+}
+
+struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *nls)
+{
+	struct cn_queue_dev *dev;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	snprintf(dev->name, sizeof(dev->name), "%s", name);
+	atomic_set(&dev->refcnt, 0);
+	INIT_LIST_HEAD(&dev->queue_list);
+	spin_lock_init(&dev->queue_lock);
+
+	dev->nls = nls;
+	dev->netlink_groups = 0;
+
+	dev->cn_queue = create_workqueue(dev->name);
+	if (!dev->cn_queue) {
+		kfree(dev);
+		return NULL;
+	}
+
+	return dev;
+}
+
+void cn_queue_free_dev(struct cn_queue_dev *dev)
+{
+	struct cn_callback_entry *cbq, *n;
+
+	flush_workqueue(dev->cn_queue);
+	destroy_workqueue(dev->cn_queue);
+
+	spin_lock_bh(&dev->queue_lock);
+	list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry)
+		list_del(&cbq->callback_entry);
+	spin_unlock_bh(&dev->queue_lock);
+
+	while (atomic_read(&dev->refcnt)) {
+		printk(KERN_INFO "Waiting for %s to become free: refcnt=%d.\n",
+		       dev->name, atomic_read(&dev->refcnt));
+		msleep(1000);
+	}
+
+	kfree(dev);
+	dev = NULL;
+}

drivers/connector/connector.c

···
+/*
+ * 	connector.c
+ * 
+ * 2004-2005 Copyright (c) Evgeniy Polyakov <[e-mail]>
+ * All rights reserved.
+ * 
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/moduleparam.h>
+#include <linux/connector.h>
+
+#include <net/sock.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Evgeniy Polyakov <[e-mail]>");
+MODULE_DESCRIPTION("Generic userspace <-> kernelspace connector.");
+
+static u32 cn_idx = CN_IDX_CONNECTOR;
+static u32 cn_val = CN_VAL_CONNECTOR;
+
+module_param(cn_idx, uint, 0);
+module_param(cn_val, uint, 0);
+MODULE_PARM_DESC(cn_idx, "Connector's main device idx.");
+MODULE_PARM_DESC(cn_val, "Connector's main device val.");
+
+static DECLARE_MUTEX(notify_lock);
+static LIST_HEAD(notify_list);
+
+static struct cn_dev cdev;
+
+int cn_already_initialized = 0;
+
+/*
+ * msg->seq and msg->ack are used to determine message genealogy.
+ * When someone sends message it puts there locally unique sequence
+ * and random acknowledge numbers.  Sequence number may be copied into
+ * nlmsghdr->nlmsg_seq too.
+ *
+ * Sequence number is incremented with each message to be sent.
+ *
+ * If we expect reply to our message then the sequence number in
+ * received message MUST be the same as in original message, and
+ * acknowledge number MUST be the same + 1.
+ *
+ * If we receive a message and its sequence number is not equal to the
+ * one we are expecting then it is a new message.
+ *
+ * If we receive a message and its sequence number is the same as one
+ * we are expecting but it's acknowledgement number is not equal to
+ * the acknowledgement number in the original message + 1, then it is
+ * a new message.
+ *
+ */
+int cn_netlink_send(struct cn_msg *msg, u32 __group, int gfp_mask)
+{
+	struct cn_callback_entry *__cbq;
+	unsigned int size;
+	struct sk_buff *skb;
+	struct nlmsghdr *nlh;
+	struct cn_msg *data;
+	struct cn_dev *dev = &cdev;
+	u32 group = 0;
+	int found = 0;
+
+	if (!__group) {
+		spin_lock_bh(&dev->cbdev->queue_lock);
+		list_for_each_entry(__cbq, &dev->cbdev->queue_list,
+				    callback_entry) {
+			if (cn_cb_equal(&__cbq->cb->id, &msg->id)) {
+				found = 1;
+				group = __cbq->group;
+			}
+		}
+		spin_unlock_bh(&dev->cbdev->queue_lock);
+
+		if (!found)
+			return -ENODEV;
+	} else {
+		group = __group;
+	}
+
+	size = NLMSG_SPACE(sizeof(*msg) + msg->len);
+
+	skb = alloc_skb(size, gfp_mask);
+	if (!skb)
+		return -ENOMEM;
+
+	nlh = NLMSG_PUT(skb, 0, msg->seq, NLMSG_DONE, size - sizeof(*nlh));
+
+	data = NLMSG_DATA(nlh);
+
+	memcpy(data, msg, sizeof(*data) + msg->len);
+
+	NETLINK_CB(skb).dst_group = group;
+
+	netlink_broadcast(dev->nls, skb, 0, group, gfp_mask);
+
+	return 0;
+
+nlmsg_failure:
+	kfree_skb(skb);
+	return -EINVAL;
+}
+
+/*
+ * Callback helper - queues work and setup destructor for given data.
+ */
+static int cn_call_callback(struct cn_msg *msg, void (*destruct_data)(void *), void *data)
+{
+	struct cn_callback_entry *__cbq;
+	struct cn_dev *dev = &cdev;
+	int found = 0;
+
+	spin_lock_bh(&dev->cbdev->queue_lock);
+	list_for_each_entry(__cbq, &dev->cbdev->queue_list, callback_entry) {
+		if (cn_cb_equal(&__cbq->cb->id, &msg->id)) {
+			/*
+			 * Let's scream if there is some magic and the
+			 * data will arrive asynchronously here.
+			 * [i.e. netlink messages will be queued].
+			 * After the first warning I will fix it
+			 * quickly, but now I think it is
+			 * impossible. --zbr (2004_04_27).
+			 */
+			if (likely(!test_bit(0, &__cbq->work.pending) &&
+					__cbq->ddata == NULL)) {
+				__cbq->cb->priv = msg;
+
+				__cbq->ddata = data;
+				__cbq->destruct_data = destruct_data;
+
+				if (queue_work(dev->cbdev->cn_queue,
+						&__cbq->work))
+					found = 1;
+			} else {
+				printk("%s: cbq->data=%p, "
+				       "work->pending=%08lx.\n",
+				       __func__, __cbq->ddata,
+				       __cbq->work.pending);
+				WARN_ON(1);
+			}
+			break;
+		}
+	}
+	spin_unlock_bh(&dev->cbdev->queue_lock);
+
+	return found ? 0 : -ENODEV;
+}
+
+/*
+ * Skb receive helper - checks skb and msg size and calls callback
+ * helper.
+ */
+static int __cn_rx_skb(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+	u32 pid, uid, seq, group;
+	struct cn_msg *msg;
+
+	pid = NETLINK_CREDS(skb)->pid;
+	uid = NETLINK_CREDS(skb)->uid;
+	seq = nlh->nlmsg_seq;
+	group = NETLINK_CB((skb)).dst_group;
+	msg = NLMSG_DATA(nlh);
+
+	return cn_call_callback(msg, (void (*)(void *))kfree_skb, skb);
+}
+
+/*
+ * Main netlink receiving function.
+ *
+ * It checks skb and netlink header sizes and calls the skb receive
+ * helper with a shared skb.
+ */
+static void cn_rx_skb(struct sk_buff *__skb)
+{
+	struct nlmsghdr *nlh;
+	u32 len;
+	int err;
+	struct sk_buff *skb;
+
+	skb = skb_get(__skb);
+
+	if (skb->len >= NLMSG_SPACE(0)) {
+		nlh = (struct nlmsghdr *)skb->data;
+
+		if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
+		    skb->len < nlh->nlmsg_len ||
+		    nlh->nlmsg_len > CONNECTOR_MAX_MSG_SIZE) {
+			kfree_skb(skb);
+			goto out;
+		}
+
+		len = NLMSG_ALIGN(nlh->nlmsg_len);
+		if (len > skb->len)
+			len = skb->len;
+
+		err = __cn_rx_skb(skb, nlh);
+		if (err < 0)
+			kfree_skb(skb);
+	}
+
+out:
+	kfree_skb(__skb);
+}
+
+/*
+ * Netlink socket input callback - dequeues the skbs and calls the
+ * main netlink receiving function.
+ */
+static void cn_input(struct sock *sk, int len)
+{
+	struct sk_buff *skb;
+
+	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL)
+		cn_rx_skb(skb);
+}
+
+/*
+ * Notification routing.
+ *
+ * Gets id and checks if there are notification request for it's idx
+ * and val.  If there are such requests notify the listeners with the
+ * given notify event.
+ *
+ */
+static void cn_notify(struct cb_id *id, u32 notify_event)
+{
+	struct cn_ctl_entry *ent;
+
+	down(&notify_lock);
+	list_for_each_entry(ent, &notify_list, notify_entry) {
+		int i;
+		struct cn_notify_req *req;
+		struct cn_ctl_msg *ctl = ent->msg;
+		int idx_found, val_found;
+
+		idx_found = val_found = 0;
+
+		req = (struct cn_notify_req *)ctl->data;
+		for (i = 0; i < ctl->idx_notify_num; ++i, ++req) {
+			if (id->idx >= req->first && 
+					id->idx < req->first + req->range) {
+				idx_found = 1;
+				break;
+			}
+		}
+
+		for (i = 0; i < ctl->val_notify_num; ++i, ++req) {
+			if (id->val >= req->first && 
+					id->val < req->first + req->range) {
+				val_found = 1;
+				break;
+			}
+		}
+
+		if (idx_found && val_found) {
+			struct cn_msg m = { .ack = notify_event, };
+
+			memcpy(&m.id, id, sizeof(m.id));
+			cn_netlink_send(&m, ctl->group, GFP_KERNEL);
+		}
+	}
+	up(&notify_lock);
+}
+
+/*
+ * Callback add routing - adds callback with given ID and name.
+ * If there is registered callback with the same ID it will not be added.
+ *
+ * May sleep.
+ */
+int cn_add_callback(struct cb_id *id, char *name, void (*callback)(void *))
+{
+	int err;
+	struct cn_dev *dev = &cdev;
+	struct cn_callback *cb;
+
+	cb = kzalloc(sizeof(*cb), GFP_KERNEL);
+	if (!cb)
+		return -ENOMEM;
+
+	scnprintf(cb->name, sizeof(cb->name), "%s", name);
+
+	memcpy(&cb->id, id, sizeof(cb->id));
+	cb->callback = callback;
+
+	err = cn_queue_add_callback(dev->cbdev, cb);
+	if (err) {
+		kfree(cb);
+		return err;
+	}
+
+	cn_notify(id, 0);
+
+	return 0;
+}
+
+/*
+ * Callback remove routing - removes callback
+ * with given ID.
+ * If there is no registered callback with given
+ * ID nothing happens.
+ *
+ * May sleep while waiting for reference counter to become zero.
+ */
+void cn_del_callback(struct cb_id *id)
+{
+	struct cn_dev *dev = &cdev;
+
+	cn_queue_del_callback(dev->cbdev, id);
+	cn_notify(id, 1);
+}
+
+/*
+ * Checks two connector's control messages to be the same.
+ * Returns 1 if they are the same or if the first one is corrupted.
+ */
+static int cn_ctl_msg_equals(struct cn_ctl_msg *m1, struct cn_ctl_msg *m2)
+{
+	int i;
+	struct cn_notify_req *req1, *req2;
+
+	if (m1->idx_notify_num != m2->idx_notify_num)
+		return 0;
+
+	if (m1->val_notify_num != m2->val_notify_num)
+		return 0;
+
+	if (m1->len != m2->len)
+		return 0;
+
+	if ((m1->idx_notify_num + m1->val_notify_num) * sizeof(*req1) !=
+	    m1->len)
+		return 1;
+
+	req1 = (struct cn_notify_req *)m1->data;
+	req2 = (struct cn_notify_req *)m2->data;
+
+	for (i = 0; i < m1->idx_notify_num; ++i) {
+		if (req1->first != req2->first || req1->range != req2->range)
+			return 0;
+		req1++;
+		req2++;
+	}
+
+	for (i = 0; i < m1->val_notify_num; ++i) {
+		if (req1->first != req2->first || req1->range != req2->range)
+			return 0;
+		req1++;
+		req2++;
+	}
+
+	return 1;
+}
+
+/*
+ * Main connector device's callback.
+ *
+ * Used for notification of a request's processing.
+ */
+static void cn_callback(void *data)
+{
+	struct cn_msg *msg = data;
+	struct cn_ctl_msg *ctl;
+	struct cn_ctl_entry *ent;
+	u32 size;
+
+	if (msg->len < sizeof(*ctl))
+		return;
+
+	ctl = (struct cn_ctl_msg *)msg->data;
+
+	size = (sizeof(*ctl) + ((ctl->idx_notify_num +
+				 ctl->val_notify_num) *
+				sizeof(struct cn_notify_req)));
+
+	if (msg->len != size)
+		return;
+
+	if (ctl->len + sizeof(*ctl) != msg->len)
+		return;
+
+	/*
+	 * Remove notification.
+	 */
+	if (ctl->group == 0) {
+		struct cn_ctl_entry *n;
+
+		down(&notify_lock);
+		list_for_each_entry_safe(ent, n, &notify_list, notify_entry) {
+			if (cn_ctl_msg_equals(ent->msg, ctl)) {
+				list_del(&ent->notify_entry);
+				kfree(ent);
+			}
+		}
+		up(&notify_lock);
+
+		return;
+	}
+
+	size += sizeof(*ent);
+
+	ent = kzalloc(size, GFP_KERNEL);
+	if (!ent)
+		return;
+
+	ent->msg = (struct cn_ctl_msg *)(ent + 1);
+
+	memcpy(ent->msg, ctl, size - sizeof(*ent));
+
+	down(&notify_lock);
+	list_add(&ent->notify_entry, &notify_list);
+	up(&notify_lock);
+}
+
+static int __init cn_init(void)
+{
+	struct cn_dev *dev = &cdev;
+	int err;
+
+	dev->input = cn_input;
+	dev->id.idx = cn_idx;
+	dev->id.val = cn_val;
+
+	dev->nls = netlink_kernel_create(NETLINK_CONNECTOR,
+					 CN_NETLINK_USERS + 0xf,
+					 dev->input, THIS_MODULE);
+	if (!dev->nls)
+		return -EIO;
+
+	dev->cbdev = cn_queue_alloc_dev("cqueue", dev->nls);
+	if (!dev->cbdev) {
+		if (dev->nls->sk_socket)
+			sock_release(dev->nls->sk_socket);
+		return -EINVAL;
+	}
+
+	err = cn_add_callback(&dev->id, "connector", &cn_callback);
+	if (err) {
+		cn_queue_free_dev(dev->cbdev);
+		if (dev->nls->sk_socket)
+			sock_release(dev->nls->sk_socket);
+		return -EINVAL;
+	}
+
+	cn_already_initialized = 1;
+
+	return 0;
+}
+
+static void __exit cn_fini(void)
+{
+	struct cn_dev *dev = &cdev;
+
+	cn_already_initialized = 0;
+
+	cn_del_callback(&dev->id);
+	cn_queue_free_dev(dev->cbdev);
+	if (dev->nls->sk_socket)
+		sock_release(dev->nls->sk_socket);
+}
+
+module_init(cn_init);
+module_exit(cn_fini);
+
+EXPORT_SYMBOL_GPL(cn_add_callback);
+EXPORT_SYMBOL_GPL(cn_del_callback);
+EXPORT_SYMBOL_GPL(cn_netlink_send);

drivers/net/bnx2.c

···
 	.phys_id		= bnx2_phys_id,
 	.get_stats_count	= bnx2_get_stats_count,
 	.get_ethtool_stats	= bnx2_get_ethtool_stats,
+	.get_perm_addr		= ethtool_op_get_perm_addr,
 };
 
 /* Called with rtnl_lock */
···
 	pci_set_drvdata(pdev, dev);
 
 	memcpy(dev->dev_addr, bp->mac_addr, 6);
+	memcpy(dev->perm_addr, bp->mac_addr, 6);
 	bp->name = board_info[ent->driver_data].name,
 	printk(KERN_INFO "%s: %s (%c%d) PCI%s %s %dMHz found at mem %lx, "
 		"IRQ %d, ",

drivers/net/hamradio/6pack.c

···
 {
 #ifdef CONFIG_INET
 	if (type != htons(ETH_P_AX25))
-		return ax25_encapsulate(skb, dev, type, daddr, saddr, len);
+		return ax25_hard_header(skb, dev, type, daddr, saddr, len);
 #endif
 	return 0;
 }

drivers/net/hamradio/baycom_epp.c

···
 
 /*****************************************************************************/
 
-#include <linux/config.h>
+#include <linux/crc-ccitt.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
···
 #include <linux/workqueue.h>
 #include <linux/fs.h>
 #include <linux/parport.h>
-#include <linux/smp_lock.h>
-#include <asm/uaccess.h>
 #include <linux/if_arp.h>
-#include <linux/kmod.h>
 #include <linux/hdlcdrv.h>
 #include <linux/baycom.h>
 #include <linux/jiffies.h>
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-/* prototypes for ax25_encapsulate and ax25_rebuild_header */
 #include <net/ax25.h> 
-#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
-#include <linux/crc-ccitt.h>
+#include <asm/uaccess.h>
 
 /* --------------------------------------------------------------------- */
 
···
 	/* Fill in the fields of the device structure */
 	bc->skb = NULL;
 	
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header = ax25_encapsulate;
+	dev->hard_header = ax25_hard_header;
 	dev->rebuild_header = ax25_rebuild_header;
-#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
-	dev->hard_header = NULL;
-	dev->rebuild_header = NULL;
-#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 	dev->set_mac_address = baycom_set_mac_address;
 	
 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */

drivers/net/hamradio/bpqether.c

···
 	dev->flags      = 0;
 
 #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header     = ax25_encapsulate;
+	dev->hard_header     = ax25_hard_header;
 	dev->rebuild_header  = ax25_rebuild_header;
 #endif
 

drivers/net/hamradio/dmascc.c

···
 static void dev_setup(struct net_device *dev)
 {
 	dev->type = ARPHRD_AX25;
-	dev->hard_header_len = 73;
+	dev->hard_header_len = AX25_MAX_HEADER_LEN;
 	dev->mtu = 1500;
-	dev->addr_len = 7;
+	dev->addr_len = AX25_ADDR_LEN;
 	dev->tx_queue_len = 64;
-	memcpy(dev->broadcast, ax25_broadcast, 7);
-	memcpy(dev->dev_addr, ax25_test, 7);
+	memcpy(dev->broadcast, ax25_broadcast, AX25_ADDR_LEN);
+	memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN);
 }
 
 static int __init setup_adapter(int card_base, int type, int n)
···
 		dev->do_ioctl = scc_ioctl;
 		dev->hard_start_xmit = scc_send_packet;
 		dev->get_stats = scc_get_stats;
-		dev->hard_header = ax25_encapsulate;
+		dev->hard_header = ax25_hard_header;
 		dev->rebuild_header = ax25_rebuild_header;
 		dev->set_mac_address = scc_set_mac_address;
 	}

drivers/net/hamradio/hdlcdrv.c

···
 
 /*****************************************************************************/
 
-#include <linux/config.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/net.h>
···
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/bitops.h>
-#include <asm/uaccess.h>
 
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
-#include <linux/etherdevice.h>
 #include <linux/skbuff.h>
 #include <linux/hdlcdrv.h>
-/* prototypes for ax25_encapsulate and ax25_rebuild_header */
 #include <net/ax25.h> 
+#include <asm/uaccess.h>
 
-/* make genksyms happy */
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/tcp.h>
 #include <linux/crc-ccitt.h>
 
 /* --------------------------------------------------------------------- */
···
 
 	s->skb = NULL;
 	
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header = ax25_encapsulate;
+	dev->hard_header = ax25_hard_header;
 	dev->rebuild_header = ax25_rebuild_header;
-#else /* CONFIG_AX25 || CONFIG_AX25_MODULE */
-	dev->hard_header = NULL;
-	dev->rebuild_header = NULL;
-#endif /* CONFIG_AX25 || CONFIG_AX25_MODULE */
 	dev->set_mac_address = hdlcdrv_set_mac_address;
 	
 	dev->type = ARPHRD_AX25;           /* AF_AX25 device */

drivers/net/hamradio/mkiss.c

···
 {
 #ifdef CONFIG_INET
 	if (type != htons(ETH_P_AX25))
-		return ax25_encapsulate(skb, dev, type, daddr, saddr, len);
+		return ax25_hard_header(skb, dev, type, daddr, saddr, len);
 #endif
 	return 0;
 }

drivers/net/hamradio/scc.c

···
 	dev->stop	     = scc_net_close;
 
 	dev->hard_start_xmit = scc_net_tx;
-	dev->hard_header     = ax25_encapsulate;
+	dev->hard_header     = ax25_hard_header;
 	dev->rebuild_header  = ax25_rebuild_header;
 	dev->set_mac_address = scc_net_set_mac_address;
 	dev->get_stats       = scc_net_get_stats;

drivers/net/hamradio/yam.c

···
 #include <linux/if_arp.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-/* prototypes for ax25_encapsulate and ax25_rebuild_header */
 #include <net/ax25.h>
-#endif	/* CONFIG_AX25 || CONFIG_AX25_MODULE */
-
-/* make genksyms happy */
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/tcp.h>
 
 #include <linux/kernel.h>
 #include <linux/proc_fs.h>
···
 
 	skb_queue_head_init(&yp->send_queue);
 
-#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
-	dev->hard_header = ax25_encapsulate;
+	dev->hard_header = ax25_hard_header;
 	dev->rebuild_header = ax25_rebuild_header;
-#else							/* CONFIG_AX25 || CONFIG_AX25_MODULE */
-	dev->hard_header = NULL;
-	dev->rebuild_header = NULL;
-#endif							/* CONFIG_AX25 || CONFIG_AX25_MODULE */
 
 	dev->set_mac_address = yam_set_mac_address;
 
-	dev->type = ARPHRD_AX25;	/* AF_AX25 device */
-	dev->hard_header_len = 73;	/* We do digipeaters now */
-	dev->mtu = 256;				/* AX25 is the default */
-	dev->addr_len = 7;			/* sizeof an ax.25 address */
-	memcpy(dev->broadcast, ax25_bcast, 7);
-	memcpy(dev->dev_addr, ax25_test, 7);
-
+	dev->type = ARPHRD_AX25;
+	dev->hard_header_len = AX25_MAX_HEADER_LEN;
+	dev->mtu = AX25_MTU;
+	dev->addr_len = AX25_ADDR_LEN;
+	memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN);
+	memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN);
 }
 
 static int __init yam_init_driver(void)

drivers/net/tg3.c

···
 		get_stat64(&hw_stats->tx_octets);
 
 	stats->rx_errors = old_stats->rx_errors +
-		get_stat64(&hw_stats->rx_errors) +
-		get_stat64(&hw_stats->rx_discards);
+		get_stat64(&hw_stats->rx_errors);
 	stats->tx_errors = old_stats->tx_errors +
 		get_stat64(&hw_stats->tx_errors) +
 		get_stat64(&hw_stats->tx_mac_errors) +
···
 
 	stats->rx_crc_errors = old_stats->rx_crc_errors +
 		calc_crc_errors(tp);
+
+	stats->rx_missed_errors = old_stats->rx_missed_errors +
+		get_stat64(&hw_stats->rx_discards);
 
 	return stats;
 }
···
 	.get_ethtool_stats	= tg3_get_ethtool_stats,
 	.get_coalesce		= tg3_get_coalesce,
 	.set_coalesce		= tg3_set_coalesce,
+	.get_perm_addr		= ethtool_op_get_perm_addr,
 };
 
 static void __devinit tg3_get_eeprom_size(struct tg3 *tp)
···
 		if (prom_getproplen(node, "local-mac-address") == 6) {
 			prom_getproperty(node, "local-mac-address",
 					 dev->dev_addr, 6);
+			memcpy(dev->perm_addr, dev->dev_addr, 6);
 			return 0;
 		}
 	}
···
 	struct net_device *dev = tp->dev;
 
 	memcpy(dev->dev_addr, idprom->id_ethaddr, 6);
+	memcpy(dev->perm_addr, idprom->id_ethaddr, 6);
 	return 0;
 }
 #endif
···
 #endif
 		return -EINVAL;
 	}
+	memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
 	return 0;
 }
 

include/linux/connector.h

···
+/*
+ * 	connector.h
+ * 
+ * 2004-2005 Copyright (c) Evgeniy Polyakov <[e-mail]>
+ * All rights reserved.
+ * 
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __CONNECTOR_H
+#define __CONNECTOR_H
+
+#include <asm/types.h>
+
+#define CN_IDX_CONNECTOR		0xffffffff
+#define CN_VAL_CONNECTOR		0xffffffff
+
+#define CN_NETLINK_USERS		1
+
+/*
+ * Maximum connector's message size.
+ */
+#define CONNECTOR_MAX_MSG_SIZE 	1024
+
+/*
+ * idx and val are unique identifiers which 
+ * are used for message routing and 
+ * must be registered in connector.h for in-kernel usage.
+ */
+
+struct cb_id {
+	__u32 idx;
+	__u32 val;
+};
+
+struct cn_msg {
+	struct cb_id id;
+
+	__u32 seq;
+	__u32 ack;
+
+	__u16 len;		/* Length of the following data */
+	__u16 flags;
+	__u8 data[0];
+};
+
+/*
+ * Notify structure - requests notification about
+ * registering/unregistering idx/val in range [first, first+range].
+ */
+struct cn_notify_req {
+	__u32 first;
+	__u32 range;
+};
+
+/*
+ * Main notification control message
+ * *_notify_num 	- number of appropriate cn_notify_req structures after 
+ *				this struct.
+ * group 		- notification receiver's idx.
+ * len 			- total length of the attached data.
+ */
+struct cn_ctl_msg {
+	__u32 idx_notify_num;
+	__u32 val_notify_num;
+	__u32 group;
+	__u32 len;
+	__u8 data[0];
+};
+
+#ifdef __KERNEL__
+
+#include <asm/atomic.h>
+
+#include <linux/list.h>
+#include <linux/workqueue.h>
+
+#include <net/sock.h>
+
+#define CN_CBQ_NAMELEN		32
+
+struct cn_queue_dev {
+	atomic_t refcnt;
+	unsigned char name[CN_CBQ_NAMELEN];
+
+	struct workqueue_struct *cn_queue;
+
+	struct list_head queue_list;
+	spinlock_t queue_lock;
+
+	int netlink_groups;
+	struct sock *nls;
+};
+
+struct cn_callback {
+	unsigned char name[CN_CBQ_NAMELEN];
+
+	struct cb_id id;
+	void (*callback) (void *);
+	void *priv;
+};
+
+struct cn_callback_entry {
+	struct list_head callback_entry;
+	struct cn_callback *cb;
+	struct work_struct work;
+	struct cn_queue_dev *pdev;
+
+	void (*destruct_data) (void *);
+	void *ddata;
+
+	int seq, group;
+	struct sock *nls;
+};
+
+struct cn_ctl_entry {
+	struct list_head notify_entry;
+	struct cn_ctl_msg *msg;
+};
+
+struct cn_dev {
+	struct cb_id id;
+
+	u32 seq, groups;
+	struct sock *nls;
+	void (*input) (struct sock * sk, int len);
+
+	struct cn_queue_dev *cbdev;
+};
+
+int cn_add_callback(struct cb_id *, char *, void (*callback) (void *));
+void cn_del_callback(struct cb_id *);
+int cn_netlink_send(struct cn_msg *, u32, int);
+
+int cn_queue_add_callback(struct cn_queue_dev *dev, struct cn_callback *cb);
+void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id);
+
+struct cn_queue_dev *cn_queue_alloc_dev(char *name, struct sock *);
+void cn_queue_free_dev(struct cn_queue_dev *dev);
+
+int cn_cb_equal(struct cb_id *, struct cb_id *);
+
+extern int cn_already_initialized;
+
+#endif				/* __KERNEL__ */
+#endif				/* __CONNECTOR_H */

include/linux/netlink.h

···
 #define NETLINK_ISCSI		8	/* Open-iSCSI */
 #define NETLINK_AUDIT		9	/* auditing */
 #define NETLINK_FIB_LOOKUP	10	
+#define NETLINK_CONNECTOR	11
 #define NETLINK_NETFILTER	12	/* netfilter subsystem */
 #define NETLINK_IP6_FW		13
 #define NETLINK_DNRTMSG		14	/* DECnet routing messages */

include/linux/sysctl.h

···
 	NET_NETROM_TRANSPORT_REQUESTED_WINDOW_SIZE=8,
 	NET_NETROM_TRANSPORT_NO_ACTIVITY_TIMEOUT=9,
 	NET_NETROM_ROUTING_CONTROL=10,
-	NET_NETROM_LINK_FAILS_COUNT=11
+	NET_NETROM_LINK_FAILS_COUNT=11,
+	NET_NETROM_RESET=12
 };
 
 /* /proc/sys/net/ax25 */

include/net/ax25.h

···
 
 /* AX.25 Protocol IDs */
 #define AX25_P_ROSE			0x01
-#define AX25_P_IP			0xCC
-#define AX25_P_ARP			0xCD
-#define AX25_P_TEXT 			0xF0
-#define AX25_P_NETROM 			0xCF
-#define	AX25_P_SEGMENT			0x08
+#define AX25_P_VJCOMP			0x06	/* Compressed TCP/IP packet   */
+						/* Van Jacobsen (RFC 1144)    */
+#define AX25_P_VJUNCOMP			0x07	/* Uncompressed TCP/IP packet */
+						/* Van Jacobsen (RFC 1144)    */
+#define	AX25_P_SEGMENT			0x08	/* Segmentation fragment      */
+#define AX25_P_TEXNET			0xc3	/* TEXTNET datagram protocol  */
+#define AX25_P_LQ			0xc4	/* Link Quality Protocol      */
+#define AX25_P_ATALK			0xca	/* Appletalk                  */
+#define AX25_P_ATALK_ARP		0xcb	/* Appletalk ARP              */
+#define AX25_P_IP			0xcc	/* ARPA Internet Protocol     */
+#define AX25_P_ARP			0xcd	/* ARPA Adress Resolution     */
+#define AX25_P_FLEXNET			0xce	/* FlexNet                    */
+#define AX25_P_NETROM 			0xcf	/* NET/ROM                    */
+#define AX25_P_TEXT 			0xF0	/* No layer 3 protocol impl.  */
 
 /* AX.25 Segment control values */
 #define	AX25_SEG_REM			0x7F
···
 /* Define Link State constants. */
 
 enum { 
-	AX25_STATE_0,
-	AX25_STATE_1,
-	AX25_STATE_2,
-	AX25_STATE_3,
-	AX25_STATE_4
+	AX25_STATE_0,			/* Listening */
+	AX25_STATE_1,			/* SABM sent */
+	AX25_STATE_2,			/* DISC sent */
+	AX25_STATE_3,			/* Established */
+	AX25_STATE_4			/* Recovery */
 };
 
 #define AX25_MODULUS 		8	/*  Standard AX.25 modulus */
···
 extern int  ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
 
 /* ax25_ip.c */
-extern int  ax25_encapsulate(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
+extern int  ax25_hard_header(struct sk_buff *, struct net_device *, unsigned short, void *, void *, unsigned int);
 extern int  ax25_rebuild_header(struct sk_buff *);
 
 /* ax25_out.c */

include/net/netrom.h

···
 
 #ifndef _NETROM_H
 #define _NETROM_H 
+
 #include <linux/netrom.h>
 #include <linux/list.h>
 #include <net/sock.h>
···
 #define	NR_DISCACK			0x04
 #define	NR_INFO				0x05
 #define	NR_INFOACK			0x06
+#define	NR_RESET			0x07
 
 #define	NR_CHOKE_FLAG			0x80
 #define	NR_NAK_FLAG			0x40
···
 #define	NR_DEFAULT_TTL			16		/* Default Time To Live - 16 */
 #define	NR_DEFAULT_ROUTING		1		/* Is routing enabled ? */
 #define	NR_DEFAULT_FAILS		2		/* Link fails until route fails */
+#define	NR_DEFAULT_RESET		0		/* Sent / accept reset cmds? */
 
 #define NR_MODULUS 			256
 #define NR_MAX_WINDOW_SIZE		127			/* Maximum Window Allowable - 127 */
 #define	NR_MAX_PACKET_SIZE		236			/* Maximum Packet Length - 236 */
+
+struct nr_private {
+	struct net_device_stats	stats;
+};
 
 struct nr_sock {
 	struct sock		sock;
···
 extern int  sysctl_netrom_transport_no_activity_timeout;
 extern int  sysctl_netrom_routing_control;
 extern int  sysctl_netrom_link_fails_count;
+extern int  sysctl_netrom_reset_circuit;
+
 extern int  nr_rx_frame(struct sk_buff *, struct net_device *);
 extern void nr_destroy_socket(struct sock *);
 
···
 extern int  nr_validate_nr(struct sock *, unsigned short);
 extern int  nr_in_rx_window(struct sock *, unsigned short);
 extern void nr_write_internal(struct sock *, int);
-extern void nr_transmit_refusal(struct sk_buff *, int);
+
+extern void __nr_transmit_reply(struct sk_buff *skb, int mine,
+	unsigned char cmdflags);
+
+/*
+ * This routine is called when a Connect Acknowledge with the Choke Flag
+ * set is needed to refuse a connection.
+ */
+#define nr_transmit_refusal(skb, mine)					\
+do {									\
+	__nr_transmit_reply((skb), (mine), NR_CONNACK | NR_CHOKE_FLAG);	\
+} while (0)
+
+/*
+ * This routine is called when we don't have a circuit matching an incoming
+ * NET/ROM packet.  This is an G8PZT Xrouter extension.
+ */
+#define nr_transmit_reset(skb, mine)					\
+do {									\
+	__nr_transmit_reply((skb), (mine), NR_RESET);			\
+} while (0)
+
 extern void nr_disconnect(struct sock *, int);
 
 /* nr_timer.c */

net/ax25/af_ax25.c

···
 		/* 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);
+		res = put_user(amount, (int __user *) argp);
 		break;
 	}
 
 	case SIOCGSTAMP:
-		if (sk != NULL) {
-			res = sock_get_timestamp(sk, argp);
-			break;
-	 	}
-		res = -EINVAL;
+		res = sock_get_timestamp(sk, argp);
 		break;
 
 	case SIOCAX25ADDUID:	/* Add a uid to the uid/call map table */
···
 };
 
 static 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,
+	.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,
 };
 
 /*
···
 	.notifier_call =ax25_device_event,
 };
 
-EXPORT_SYMBOL(ax25_encapsulate);
+EXPORT_SYMBOL(ax25_hard_header);
 EXPORT_SYMBOL(ax25_rebuild_header);
 EXPORT_SYMBOL(ax25_findbyuid);
 EXPORT_SYMBOL(ax25_find_cb);

net/ax25/ax25_ip.c

···
 
 #ifdef CONFIG_INET
 
-int ax25_encapsulate(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
+int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
 {
 	unsigned char *buff;
 
···
   		*buff++ = AX25_P_ARP;
   		break;
   	default:
-  		printk(KERN_ERR "AX.25: ax25_encapsulate - wrong protocol type 0x%2.2x\n", type);
+  		printk(KERN_ERR "AX.25: ax25_hard_header - wrong protocol type 0x%2.2x\n", type);
   		*buff++ = 0;
   		break;
  	}
···
 
 #else	/* INET */
 
-int ax25_encapsulate(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
+int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
 {
 	return -AX25_HEADER_LEN;
 }

net/core/pktgen.c

···
 		thread_lock();
 		t->control |= T_REMDEV;
 		thread_unlock();
-		current->state = TASK_INTERRUPTIBLE;
-		schedule_timeout(HZ/8);  /* Propagate thread->control  */
+		schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
 		ret = count;
                 sprintf(pg_result, "OK: rem_device_all");
 		goto out;
···
 	printk(KERN_INFO "sleeping for %d\n", (int)(spin_until_us - now));
 	while (now < spin_until_us) {
 		/* TODO: optimise sleeping behavior */
-		if (spin_until_us - now > (1000000/HZ)+1) {
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(1);
-		} else if (spin_until_us - now > 100) {
+		if (spin_until_us - now > jiffies_to_usecs(1)+1)
+			schedule_timeout_interruptible(1);
+		else if (spin_until_us - now > 100) {
 			do_softirq();
 			if (!pkt_dev->running)
 				return;
···
 	}
 	thread_unlock();
 
-	current->state = TASK_INTERRUPTIBLE;
-	schedule_timeout(HZ/8);  /* Propagate thread->control  */
+	schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
 			
 	pktgen_wait_all_threads_run();
 }

net/dccp/ccids/ccid3.c

···
 {
 	const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
 
+	/* Listen socks doesn't have a private CCID block */
+	if (sk->sk_state == DCCP_LISTEN)
+		return;
+
 	BUG_ON(hcrx == NULL);
 
 	info->tcpi_ca_state	= hcrx->ccid3hcrx_state;
···
 static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
 {
 	const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+
+	/* Listen socks doesn't have a private CCID block */
+	if (sk->sk_state == DCCP_LISTEN)
+		return;
 
 	BUG_ON(hctx == NULL);
 

net/ipv4/ipconfig.c

···
 #endif
 
 		jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
-		while (time_before(jiffies, jiff) && !ic_got_reply) {
-			set_current_state(TASK_UNINTERRUPTIBLE);
-			schedule_timeout(1);
-		}
+		while (time_before(jiffies, jiff) && !ic_got_reply)
+			schedule_timeout_uninterruptible(1);
 #ifdef IPCONFIG_DHCP
 		/* DHCP isn't done until we get a DHCPACK. */
 		if ((ic_got_reply & IC_BOOTP)

net/irda/ircomm/ircomm_tty.c

···
 	self->tty = NULL;
 
 	if (self->blocked_open) {
-		if (self->close_delay) {
-			current->state = TASK_INTERRUPTIBLE;
-			schedule_timeout(self->close_delay);
-		}
+		if (self->close_delay)
+			schedule_timeout_interruptible(self->close_delay);
 		wake_up_interruptible(&self->open_wait);
 	}
 
···
 	spin_lock_irqsave(&self->spinlock, flags);
 	while (self->tx_skb && self->tx_skb->len) {
 		spin_unlock_irqrestore(&self->spinlock, flags);
-		current->state = TASK_INTERRUPTIBLE;
-		schedule_timeout(poll_time);
+		schedule_timeout_interruptible(poll_time);
 		spin_lock_irqsave(&self->spinlock, flags);
 		if (signal_pending(current))
 			break;

net/netrom/af_netrom.c

···
 int sysctl_netrom_transport_no_activity_timeout   = NR_DEFAULT_IDLE;
 int sysctl_netrom_routing_control                 = NR_DEFAULT_ROUTING;
 int sysctl_netrom_link_fails_count                = NR_DEFAULT_FAILS;
+int sysctl_netrom_reset_circuit                   = NR_DEFAULT_RESET;
 
 static unsigned short circuit = 0x101;
 
···
 	if (frametype != NR_CONNREQ) {
 		/*
 		 * Here it would be nice to be able to send a reset but
-		 * NET/ROM doesn't have one. The following hack would
-		 * have been a way to extend the protocol but apparently
-		 * it kills BPQ boxes... :-(
+		 * NET/ROM doesn't have one.  We've tried to extend the protocol
+		 * by sending NR_CONNACK | NR_CHOKE_FLAGS replies but that
+		 * apparently kills BPQ boxes... :-(
+		 * So now we try to follow the established behaviour of
+		 * G8PZT's Xrouter which is sending packets with command type 7
+		 * as an extension of the protocol.
 		 */
-#if 0
-		/*
-		 * Never reply to a CONNACK/CHOKE.
-		 */
-		if (frametype != NR_CONNACK || flags != NR_CHOKE_FLAG)
-			nr_transmit_refusal(skb, 1);
-#endif
+		if (sysctl_netrom_reset_circuit &&
+		    (frametype != NR_RESET || flags != 0))
+			nr_transmit_reset(skb, 1);
+
 		return 0;
 	}
 
···
 	}
 
 	case SIOCGSTAMP:
-		ret = -EINVAL;
-		if (sk != NULL)
-			ret = sock_get_timestamp(sk, argp);
+		ret = sock_get_timestamp(sk, argp);
 		release_sock(sk);
 		return ret;
 
···
 		struct net_device *dev;
 
 		sprintf(name, "nr%d", i);
-		dev = alloc_netdev(sizeof(struct net_device_stats), name,
-					  nr_setup);
+		dev = alloc_netdev(sizeof(struct nr_private), name, nr_setup);
 		if (!dev) {
 			printk(KERN_ERR "NET/ROM: nr_proto_init - unable to allocate device structure\n");
 			goto fail;

net/netrom/nr_dev.c

···
 	struct net_device_stats *stats = netdev_priv(dev);
 
 	if (!netif_running(dev)) {
-		stats->rx_errors++;
+		stats->rx_dropped++;
 		return 0;
 	}
 
···
 
 static int nr_rebuild_header(struct sk_buff *skb)
 {
-	struct net_device *dev = skb->dev;
-	struct net_device_stats *stats = netdev_priv(dev);
-	struct sk_buff *skbn;
 	unsigned char *bp = skb->data;
-	int len;
 
-	if (arp_find(bp + 7, skb)) {
+	if (arp_find(bp + 7, skb))
 		return 1;
-	}
 
 	bp[6] &= ~AX25_CBIT;
 	bp[6] &= ~AX25_EBIT;
···
 	bp[6] |= AX25_EBIT;
 	bp[6] |= AX25_SSSID_SPARE;
 
-	if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
-		kfree_skb(skb);
-		return 1;
-	}
-
-	if (skb->sk != NULL)
-		skb_set_owner_w(skbn, skb->sk);
-
-	kfree_skb(skb);
-
-	len = skbn->len;
-
-	if (!nr_route_frame(skbn, NULL)) {
-		kfree_skb(skbn);
-		stats->tx_errors++;
-	}
-
-	stats->tx_packets++;
-	stats->tx_bytes += len;
-
-	return 1;
+	return 0;
 }
 
 #else
···
 
 static int nr_xmit(struct sk_buff *skb, struct net_device *dev)
 {
-	struct net_device_stats *stats = netdev_priv(dev);
-	dev_kfree_skb(skb);
-	stats->tx_errors++;
+	struct nr_private *nr = netdev_priv(dev);
+	struct net_device_stats *stats = &nr->stats;
+	unsigned int len = skb->len;
+
+	if (!nr_route_frame(skb, NULL)) {
+		kfree_skb(skb);
+		stats->tx_errors++;
+		return 0;
+	}
+
+	stats->tx_packets++;
+	stats->tx_bytes += len;
+
 	return 0;
 }
 
 static struct net_device_stats *nr_get_stats(struct net_device *dev)
 {
-	return netdev_priv(dev);
+	struct nr_private *nr = netdev_priv(dev);
+
+	return &nr->stats;
 }
 
 void nr_setup(struct net_device *dev)
···
 	dev->hard_header_len	= NR_NETWORK_LEN + NR_TRANSPORT_LEN;
 	dev->addr_len		= AX25_ADDR_LEN;
 	dev->type		= ARPHRD_NETROM;
-	dev->tx_queue_len	= 40;
 	dev->rebuild_header	= nr_rebuild_header;
 	dev->set_mac_address    = nr_set_mac_address;
 
 	/* New-style flags. */
-	dev->flags		= 0;
+	dev->flags		= IFF_NOARP;
 
 	dev->get_stats 		= nr_get_stats;
 }

net/netrom/nr_in.c

···
 		nr_disconnect(sk, ECONNREFUSED);
 		break;
 
+	case NR_RESET:
+		if (sysctl_netrom_reset_circuit);
+			nr_disconnect(sk, ECONNRESET);
+		break;
+
 	default:
 		break;
 	}
···
 
 	case NR_DISCACK:
 		nr_disconnect(sk, 0);
+		break;
+
+	case NR_RESET:
+		if (sysctl_netrom_reset_circuit);
+			nr_disconnect(sk, ECONNRESET);
 		break;
 
 	default:
···
 				nr_start_t2timer(sk);
 			}
 		}
+		break;
+
+	case NR_RESET:
+		if (sysctl_netrom_reset_circuit);
+			nr_disconnect(sk, ECONNRESET);
 		break;
 
 	default:

net/netrom/nr_subr.c

···
 }
 
 /*
- * This routine is called when a Connect Acknowledge with the Choke Flag
- * set is needed to refuse a connection.
+ * This routine is called to send an error reply.
  */
-void nr_transmit_refusal(struct sk_buff *skb, int mine)
+void __nr_transmit_reply(struct sk_buff *skb, int mine, unsigned char cmdflags)
 {
 	struct sk_buff *skbn;
 	unsigned char *dptr;
···
 		*dptr++ = 0;
 	}
 
-	*dptr++ = NR_CONNACK | NR_CHOKE_FLAG;
+	*dptr++ = cmdflags;
 	*dptr++ = 0;
 
 	if (!nr_route_frame(skbn, NULL))

net/netrom/sysctl_net_netrom.c

···
 static int max_idle[]    = {65535 * HZ};
 static int min_route[]   = {0}, max_route[]   = {1};
 static int min_fails[]   = {1}, max_fails[]   = {10};
+static int min_reset[]   = {0}, max_reset[]   = {1};
 
 static struct ctl_table_header *nr_table_header;
 
···
 		.strategy	= &sysctl_intvec,
 		.extra1		= &min_fails,
 		.extra2		= &max_fails
+	},
+        {
+		.ctl_name	= NET_NETROM_RESET,
+		.procname	= "reset",
+		.data		= &sysctl_netrom_reset_circuit,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &min_reset,
+		.extra2		= &max_reset
 	},
 	{ .ctl_name = 0 }
 };

net/rose/af_rose.c

···
 		amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
 		if (amount < 0)
 			amount = 0;
-		return put_user(amount, (unsigned int __user *)argp);
+		return put_user(amount, (unsigned int __user *) argp);
 	}
 
 	case TIOCINQ: {
···
 		/* 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;
-		return put_user(amount, (unsigned int __user *)argp);
+		return put_user(amount, (unsigned int __user *) argp);
 	}
 
 	case SIOCGSTAMP:
-		if (sk != NULL) 
-			return sock_get_timestamp(sk, (struct timeval __user *)argp);
-		return -EINVAL;
+		return sock_get_timestamp(sk, (struct timeval __user *) argp);
 
 	case SIOCGIFADDR:
 	case SIOCSIFADDR:

net/rose/rose_dev.c

···
 	dev->set_mac_address    = rose_set_mac_address;
 
 	/* New-style flags. */
-	dev->flags		= 0;
+	dev->flags		= IFF_NOARP;
 	dev->get_stats = rose_get_stats;
 }

net/sunrpc/svcsock.c

···
 	while (rqstp->rq_arghi < pages) {
 		struct page *p = alloc_page(GFP_KERNEL);
 		if (!p) {
-			set_current_state(TASK_UNINTERRUPTIBLE);
-			schedule_timeout(HZ/2);
+			schedule_timeout_uninterruptible(msecs_to_jiffies(500));
 			continue;
 		}
 		rqstp->rq_argpages[rqstp->rq_arghi++] = p;