(2006-08-06) rescue-bootcd

extra/linux-2.6.10/net/netlink/Makefile

@@ -0,0 +1,6 @@
+#
+# Makefile for the netlink driver.
+#
+
+obj-y  				:= af_netlink.o
+obj-$(CONFIG_NETLINK_DEV)	+= netlink_dev.o

extra/linux-2.6.10/net/netlink/netlink_dev.c

@@ -0,0 +1,278 @@
+/*
+ * NETLINK	An implementation of a loadable kernel mode driver providing
+ *		multiple kernel/user space bidirectional communications links.
+ *
+ * 		Author: 	Alan Cox <alan@redhat.com>
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ * 
+ *	Now netlink devices are emulated on the top of netlink sockets
+ *	by compatibility reasons. Remove this file after a period. --ANK
+ *
+ */
+
+#include <linux/module.h>
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/device.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+static long open_map;
+static struct socket *netlink_user[MAX_LINKS];
+static struct class_simple *netlink_class;
+
+/*
+ *	Device operations
+ */
+ 
+static unsigned int netlink_poll(struct file *file, poll_table * wait)
+{
+	struct socket *sock = netlink_user[iminor(file->f_dentry->d_inode)];
+
+	if (sock->ops->poll==NULL)
+		return 0;
+	return sock->ops->poll(file, sock, wait);
+}
+
+/*
+ *	Write a message to the kernel side of a communication link
+ */
+ 
+static ssize_t netlink_write(struct file * file, const char __user * buf,
+			     size_t count, loff_t *pos)
+{
+	struct inode *inode = file->f_dentry->d_inode;
+	struct socket *sock = netlink_user[iminor(inode)];
+	struct msghdr msg;
+	struct iovec iov;
+
+	iov.iov_base = (void __user*)buf;
+	iov.iov_len = count;
+	msg.msg_name=NULL;
+	msg.msg_namelen=0;
+	msg.msg_controllen=0;
+	msg.msg_flags=0;
+	msg.msg_iov=&iov;
+	msg.msg_iovlen=1;
+
+	return sock_sendmsg(sock, &msg, count);
+}
+
+/*
+ *	Read a message from the kernel side of the communication link
+ */
+
+static ssize_t netlink_read(struct file * file, char __user * buf,
+			    size_t count, loff_t *pos)
+{
+	struct inode *inode = file->f_dentry->d_inode;
+	struct socket *sock = netlink_user[iminor(inode)];
+	struct msghdr msg;
+	struct iovec iov;
+
+	iov.iov_base = buf;
+	iov.iov_len = count;
+	msg.msg_name=NULL;
+	msg.msg_namelen=0;
+	msg.msg_controllen=0;
+	msg.msg_flags=0;
+	msg.msg_iov=&iov;
+	msg.msg_iovlen=1;
+	if (file->f_flags&O_NONBLOCK)
+		msg.msg_flags=MSG_DONTWAIT;
+
+	return sock_recvmsg(sock, &msg, count, msg.msg_flags);
+}
+
+static int netlink_open(struct inode * inode, struct file * file)
+{
+	unsigned int minor = iminor(inode);
+	struct socket *sock;
+	struct sockaddr_nl nladdr;
+	int err;
+
+	if (minor>=MAX_LINKS)
+		return -ENODEV;
+	if (test_and_set_bit(minor, &open_map))
+		return -EBUSY;
+
+	err = sock_create_kern(PF_NETLINK, SOCK_RAW, minor, &sock);
+	if (err < 0)
+		goto out;
+
+	memset(&nladdr, 0, sizeof(nladdr));
+	nladdr.nl_family = AF_NETLINK;
+	nladdr.nl_groups = ~0;
+	if ((err = sock->ops->bind(sock, (struct sockaddr*)&nladdr, sizeof(nladdr))) < 0) {
+		sock_release(sock);
+		goto out;
+	}
+
+	netlink_user[minor] = sock;
+	return 0;
+
+out:
+	clear_bit(minor, &open_map);
+	return err;
+}
+
+static int netlink_release(struct inode * inode, struct file * file)
+{
+	unsigned int minor = iminor(inode);
+	struct socket *sock;
+
+	sock = netlink_user[minor];
+	netlink_user[minor] = NULL;
+	clear_bit(minor, &open_map);
+	sock_release(sock);
+	return 0;
+}
+
+
+static int netlink_ioctl(struct inode *inode, struct file *file,
+		    unsigned int cmd, unsigned long arg)
+{
+	unsigned int minor = iminor(inode);
+	int retval = 0;
+
+	if (minor >= MAX_LINKS)
+		return -ENODEV;
+	switch ( cmd ) {
+		default:
+			retval = -EINVAL;
+	}
+	return retval;
+}
+
+
+static struct file_operations netlink_fops = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.read =		netlink_read,
+	.write =	netlink_write,
+	.poll =		netlink_poll,
+	.ioctl =	netlink_ioctl,
+	.open =		netlink_open,
+	.release =	netlink_release,
+};
+
+static struct {
+	char *name;
+	int minor;
+} entries[] = {
+	{
+		.name	= "route",
+		.minor	= NETLINK_ROUTE,
+	},
+	{
+		.name	= "skip",
+		.minor	= NETLINK_SKIP,
+	},
+	{
+		.name	= "usersock",
+		.minor	= NETLINK_USERSOCK,
+	},
+	{
+		.name	= "fwmonitor",
+		.minor	= NETLINK_FIREWALL,
+	},
+	{
+		.name	= "tcpdiag",
+		.minor	= NETLINK_TCPDIAG,
+	},
+	{
+		.name	= "nflog",
+		.minor	= NETLINK_NFLOG,
+	},
+	{
+		.name	= "xfrm",
+		.minor	= NETLINK_XFRM,
+	},
+	{
+		.name	= "arpd",
+		.minor	= NETLINK_ARPD,
+	},
+	{
+		.name	= "route6",
+		.minor	= NETLINK_ROUTE6,
+	},
+	{
+		.name	= "ip6_fw",
+		.minor	= NETLINK_IP6_FW,
+	},
+	{
+		.name	= "dnrtmsg",
+		.minor	= NETLINK_DNRTMSG,
+	},
+};
+
+static int __init init_netlink(void)
+{
+	int i;
+
+	if (register_chrdev(NETLINK_MAJOR,"netlink", &netlink_fops)) {
+		printk(KERN_ERR "netlink: unable to get major %d\n", NETLINK_MAJOR);
+		return -EIO;
+	}
+
+	netlink_class = class_simple_create(THIS_MODULE, "netlink");
+	if (IS_ERR(netlink_class)) {
+		printk (KERN_ERR "Error creating netlink class.\n");
+		unregister_chrdev(NETLINK_MAJOR, "netlink");
+		return PTR_ERR(netlink_class);
+	}
+
+	devfs_mk_dir("netlink");
+
+	/*  Someone tell me the official names for the uppercase ones  */
+	for (i = 0; i < ARRAY_SIZE(entries); i++) {
+		devfs_mk_cdev(MKDEV(NETLINK_MAJOR, entries[i].minor),
+			S_IFCHR|S_IRUSR|S_IWUSR, "netlink/%s", entries[i].name);
+		class_simple_device_add(netlink_class, MKDEV(NETLINK_MAJOR, entries[i].minor), NULL, "%s", entries[i].name);
+	}
+
+	for (i = 0; i < 16; i++) {
+		devfs_mk_cdev(MKDEV(NETLINK_MAJOR, i + 16),
+			S_IFCHR|S_IRUSR|S_IWUSR, "netlink/tap%d", i);
+		class_simple_device_add(netlink_class, MKDEV(NETLINK_MAJOR, i + 16), NULL, "tap%d", i);
+	}
+
+	return 0;
+}
+
+static void __exit cleanup_netlink(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(entries); i++) {
+		devfs_remove("netlink/%s", entries[i].name);
+		class_simple_device_remove(MKDEV(NETLINK_MAJOR, entries[i].minor));
+	}
+	for (i = 0; i < 16; i++) {
+		devfs_remove("netlink/tap%d", i);
+		class_simple_device_remove(MKDEV(NETLINK_MAJOR, i + 16));
+	}
+	devfs_remove("netlink");
+	class_simple_destroy(netlink_class);
+	unregister_chrdev(NETLINK_MAJOR, "netlink");
+}
+
+MODULE_LICENSE("GPL");
+module_init(init_netlink);
+module_exit(cleanup_netlink);