imported original firmware WRT54GL_v4.30.11_11_US

1 files changed, 1756 insertions, 0 deletions

diff --git a/release/src/linux/linux/net/socket.c b/release/src/linux/linux/net/socket.c
new file mode 100644
index 00000000..d8b479c9
--- /dev/null
+++ b/release/src/linux/linux/net/socket.c
@@ -0,0 +1,1756 @@
+/*
+ * NET		An implementation of the SOCKET network access protocol.
+ *
+ * Version:	@(#)socket.c	1.1.93	18/02/95
+ *
+ * Authors:	Orest Zborowski, <obz@Kodak.COM>
+ *		Ross Biro, <bir7@leland.Stanford.Edu>
+ *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * Fixes:
+ *		Anonymous	:	NOTSOCK/BADF cleanup. Error fix in
+ *					shutdown()
+ *		Alan Cox	:	verify_area() fixes
+ *		Alan Cox	:	Removed DDI
+ *		Jonathan Kamens	:	SOCK_DGRAM reconnect bug
+ *		Alan Cox	:	Moved a load of checks to the very
+ *					top level.
+ *		Alan Cox	:	Move address structures to/from user
+ *					mode above the protocol layers.
+ *		Rob Janssen	:	Allow 0 length sends.
+ *		Alan Cox	:	Asynchronous I/O support (cribbed from the
+ *					tty drivers).
+ *		Niibe Yutaka	:	Asynchronous I/O for writes (4.4BSD style)
+ *		Jeff Uphoff	:	Made max number of sockets command-line
+ *					configurable.
+ *		Matti Aarnio	:	Made the number of sockets dynamic,
+ *					to be allocated when needed, and mr.
+ *					Uphoff's max is used as max to be
+ *					allowed to allocate.
+ *		Linus		:	Argh. removed all the socket allocation
+ *					altogether: it's in the inode now.
+ *		Alan Cox	:	Made sock_alloc()/sock_release() public
+ *					for NetROM and future kernel nfsd type
+ *					stuff.
+ *		Alan Cox	:	sendmsg/recvmsg basics.
+ *		Tom Dyas	:	Export net symbols.
+ *		Marcin Dalecki	:	Fixed problems with CONFIG_NET="n".
+ *		Alan Cox	:	Added thread locking to sys_* calls
+ *					for sockets. May have errors at the
+ *					moment.
+ *		Kevin Buhr	:	Fixed the dumb errors in the above.
+ *		Andi Kleen	:	Some small cleanups, optimizations,
+ *					and fixed a copy_from_user() bug.
+ *		Tigran Aivazian	:	sys_send(args) calls sys_sendto(args, NULL, 0)
+ *		Tigran Aivazian	:	Made listen(2) backlog sanity checks 
+ *					protocol-independent
+ *
+ *
+ *		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 module is effectively the top level interface to the BSD socket
+ *	paradigm. 
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/smp_lock.h>
+#include <linux/socket.h>
+#include <linux/file.h>
+#include <linux/net.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/wanrouter.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+
+#if defined(CONFIG_KMOD) && defined(CONFIG_NET)
+#include <linux/kmod.h>
+#endif
+
+#include <asm/uaccess.h>
+
+#include <net/sock.h>
+#include <net/scm.h>
+#include <linux/netfilter.h>
+
+static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
+static ssize_t sock_read(struct file *file, char *buf,
+			 size_t size, loff_t *ppos);
+static ssize_t sock_write(struct file *file, const char *buf,
+			  size_t size, loff_t *ppos);
+static int sock_mmap(struct file *file, struct vm_area_struct * vma);
+
+static int sock_close(struct inode *inode, struct file *file);
+static unsigned int sock_poll(struct file *file,
+			      struct poll_table_struct *wait);
+static int sock_ioctl(struct inode *inode, struct file *file,
+		      unsigned int cmd, unsigned long arg);
+static int sock_fasync(int fd, struct file *filp, int on);
+static ssize_t sock_readv(struct file *file, const struct iovec *vector,
+			  unsigned long count, loff_t *ppos);
+static ssize_t sock_writev(struct file *file, const struct iovec *vector,
+			  unsigned long count, loff_t *ppos);
+static ssize_t sock_sendpage(struct file *file, struct page *page,
+			     int offset, size_t size, loff_t *ppos, int more);
+
+
+/*
+ *	Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
+ *	in the operation structures but are done directly via the socketcall() multiplexor.
+ */
+
+static struct file_operations socket_file_ops = {
+	llseek:		no_llseek,
+	read:		sock_read,
+	write:		sock_write,
+	poll:		sock_poll,
+	ioctl:		sock_ioctl,
+	mmap:		sock_mmap,
+	open:		sock_no_open,	/* special open code to disallow open via /proc */
+	release:	sock_close,
+	fasync:		sock_fasync,
+	readv:		sock_readv,
+	writev:		sock_writev,
+	sendpage:	sock_sendpage
+};
+
+/*
+ *	The protocol list. Each protocol is registered in here.
+ */
+
+static struct net_proto_family *net_families[NPROTO];
+
+#ifdef CONFIG_SMP
+static atomic_t net_family_lockct = ATOMIC_INIT(0);
+static spinlock_t net_family_lock = SPIN_LOCK_UNLOCKED;
+
+/* The strategy is: modifications net_family vector are short, do not
+   sleep and veeery rare, but read access should be free of any exclusive
+   locks.
+ */
+
+static void net_family_write_lock(void)
+{
+	spin_lock(&net_family_lock);
+	while (atomic_read(&net_family_lockct) != 0) {
+		spin_unlock(&net_family_lock);
+
+		yield();
+
+		spin_lock(&net_family_lock);
+	}
+}
+
+static __inline__ void net_family_write_unlock(void)
+{
+	spin_unlock(&net_family_lock);
+}
+
+static __inline__ void net_family_read_lock(void)
+{
+	atomic_inc(&net_family_lockct);
+	spin_unlock_wait(&net_family_lock);
+}
+
+static __inline__ void net_family_read_unlock(void)
+{
+	atomic_dec(&net_family_lockct);
+}
+
+#else
+#define net_family_write_lock() do { } while(0)
+#define net_family_write_unlock() do { } while(0)
+#define net_family_read_lock() do { } while(0)
+#define net_family_read_unlock() do { } while(0)
+#endif
+
+
+/*
+ *	Statistics counters of the socket lists
+ */
+
+static union {
+	int	counter;
+	char	__pad[SMP_CACHE_BYTES];
+} sockets_in_use[NR_CPUS] __cacheline_aligned = {{0}};
+
+/*
+ *	Support routines. Move socket addresses back and forth across the kernel/user
+ *	divide and look after the messy bits.
+ */
+
+#define MAX_SOCK_ADDR	128		/* 108 for Unix domain - 
+					   16 for IP, 16 for IPX,
+					   24 for IPv6,
+					   about 80 for AX.25 
+					   must be at least one bigger than
+					   the AF_UNIX size (see net/unix/af_unix.c
+					   :unix_mkname()).  
+					 */
+					 
+/**
+ *	move_addr_to_kernel	-	copy a socket address into kernel space
+ *	@uaddr: Address in user space
+ *	@kaddr: Address in kernel space
+ *	@ulen: Length in user space
+ *
+ *	The address is copied into kernel space. If the provided address is
+ *	too long an error code of -EINVAL is returned. If the copy gives
+ *	invalid addresses -EFAULT is returned. On a success 0 is returned.
+ */
+
+int move_addr_to_kernel(void *uaddr, int ulen, void *kaddr)
+{
+	if(ulen<0||ulen>MAX_SOCK_ADDR)
+		return -EINVAL;
+	if(ulen==0)
+		return 0;
+	if(copy_from_user(kaddr,uaddr,ulen))
+		return -EFAULT;
+	return 0;
+}
+
+/**
+ *	move_addr_to_user	-	copy an address to user space
+ *	@kaddr: kernel space address
+ *	@klen: length of address in kernel
+ *	@uaddr: user space address
+ *	@ulen: pointer to user length field
+ *
+ *	The value pointed to by ulen on entry is the buffer length available.
+ *	This is overwritten with the buffer space used. -EINVAL is returned
+ *	if an overlong buffer is specified or a negative buffer size. -EFAULT
+ *	is returned if either the buffer or the length field are not
+ *	accessible.
+ *	After copying the data up to the limit the user specifies, the true
+ *	length of the data is written over the length limit the user
+ *	specified. Zero is returned for a success.
+ */
+ 
+int move_addr_to_user(void *kaddr, int klen, void *uaddr, int *ulen)
+{
+	int err;
+	int len;
+
+	if((err=get_user(len, ulen)))
+		return err;
+	if(len>klen)
+		len=klen;
+	if(len<0 || len> MAX_SOCK_ADDR)
+		return -EINVAL;
+	if(len)
+	{
+		if(copy_to_user(uaddr,kaddr,len))
+			return -EFAULT;
+	}
+	/*
+	 *	"fromlen shall refer to the value before truncation.."
+	 *			1003.1g
+	 */
+	return __put_user(klen, ulen);
+}
+
+#define SOCKFS_MAGIC 0x534F434B
+static int sockfs_statfs(struct super_block *sb, struct statfs *buf)
+{
+	buf->f_type = SOCKFS_MAGIC;
+	buf->f_bsize = 1024;
+	buf->f_namelen = 255;
+	return 0;
+}
+
+static struct super_operations sockfs_ops = {
+	statfs:		sockfs_statfs,
+};
+
+static struct super_block * sockfs_read_super(struct super_block *sb, void *data, int silent)
+{
+	struct inode *root = new_inode(sb);
+	if (!root)
+		return NULL;
+	root->i_mode = S_IFDIR | S_IRUSR | S_IWUSR;
+	root->i_uid = root->i_gid = 0;
+	root->i_atime = root->i_mtime = root->i_ctime = CURRENT_TIME;
+	sb->s_blocksize = 1024;
+	sb->s_blocksize_bits = 10;
+	sb->s_magic = SOCKFS_MAGIC;
+	sb->s_op	= &sockfs_ops;
+	sb->s_root = d_alloc(NULL, &(const struct qstr) { "socket:", 7, 0 });
+	if (!sb->s_root) {
+		iput(root);
+		return NULL;
+	}
+	sb->s_root->d_sb = sb;
+	sb->s_root->d_parent = sb->s_root;
+	d_instantiate(sb->s_root, root);
+	return sb;
+}
+
+static struct vfsmount *sock_mnt;
+static DECLARE_FSTYPE(sock_fs_type, "sockfs", sockfs_read_super, FS_NOMOUNT);
+static int sockfs_delete_dentry(struct dentry *dentry)
+{
+	return 1;
+}
+static struct dentry_operations sockfs_dentry_operations = {
+	d_delete:	sockfs_delete_dentry,
+};
+
+/*
+ *	Obtains the first available file descriptor and sets it up for use.
+ *
+ *	This functions creates file structure and maps it to fd space
+ *	of current process. On success it returns file descriptor
+ *	and file struct implicitly stored in sock->file.
+ *	Note that another thread may close file descriptor before we return
+ *	from this function. We use the fact that now we do not refer
+ *	to socket after mapping. If one day we will need it, this
+ *	function will inincrement ref. count on file by 1.
+ *
+ *	In any case returned fd MAY BE not valid!
+ *	This race condition is inavoidable
+ *	with shared fd spaces, we cannot solve is inside kernel,
+ *	but we take care of internal coherence yet.
+ */
+
+static int sock_map_fd(struct socket *sock)
+{
+	int fd;
+	struct qstr this;
+	char name[32];
+
+	/*
+	 *	Find a file descriptor suitable for return to the user. 
+	 */
+
+	fd = get_unused_fd();
+	if (fd >= 0) {
+		struct file *file = get_empty_filp();
+
+		if (!file) {
+			put_unused_fd(fd);
+			fd = -ENFILE;
+			goto out;
+		}
+
+		sprintf(name, "[%lu]", sock->inode->i_ino);
+		this.name = name;
+		this.len = strlen(name);
+		this.hash = sock->inode->i_ino;
+
+		file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this);
+		if (!file->f_dentry) {
+			put_filp(file);
+			put_unused_fd(fd);
+			fd = -ENOMEM;
+			goto out;
+		}
+		file->f_dentry->d_op = &sockfs_dentry_operations;
+		d_add(file->f_dentry, sock->inode);
+		file->f_vfsmnt = mntget(sock_mnt);
+
+		sock->file = file;
+		file->f_op = sock->inode->i_fop = &socket_file_ops;
+		file->f_mode = 3;
+		file->f_flags = O_RDWR;
+		file->f_pos = 0;
+		fd_install(fd, file);
+	}
+
+out:
+	return fd;
+}
+
+extern __inline__ struct socket *socki_lookup(struct inode *inode)
+{
+	return &inode->u.socket_i;
+}
+
+/**
+ *	sockfd_lookup	- 	Go from a file number to its socket slot
+ *	@fd: file handle
+ *	@err: pointer to an error code return
+ *
+ *	The file handle passed in is locked and the socket it is bound
+ *	too is returned. If an error occurs the err pointer is overwritten
+ *	with a negative errno code and NULL is returned. The function checks
+ *	for both invalid handles and passing a handle which is not a socket.
+ *
+ *	On a success the socket object pointer is returned.
+ */
+
+struct socket *sockfd_lookup(int fd, int *err)
+{
+	struct file *file;
+	struct inode *inode;
+	struct socket *sock;
+
+	if (!(file = fget(fd)))
+	{
+		*err = -EBADF;
+		return NULL;
+	}
+
+	inode = file->f_dentry->d_inode;
+	if (!inode->i_sock || !(sock = socki_lookup(inode)))
+	{
+		*err = -ENOTSOCK;
+		fput(file);
+		return NULL;
+	}
+
+	if (sock->file != file) {
+		printk(KERN_ERR "socki_lookup: socket file changed!\n");
+		sock->file = file;
+	}
+	return sock;
+}
+
+extern __inline__ void sockfd_put(struct socket *sock)
+{
+	fput(sock->file);
+}
+
+/**
+ *	sock_alloc	-	allocate a socket
+ *	
+ *	Allocate a new inode and socket object. The two are bound together
+ *	and initialised. The socket is then returned. If we are out of inodes
+ *	NULL is returned.
+ */
+
+struct socket *sock_alloc(void)
+{
+	struct inode * inode;
+	struct socket * sock;
+
+	inode = get_empty_inode();
+	if (!inode)
+		return NULL;
+
+	inode->i_sb = sock_mnt->mnt_sb;
+	sock = socki_lookup(inode);
+
+	inode->i_mode = S_IFSOCK|S_IRWXUGO;
+	inode->i_sock = 1;
+	inode->i_uid = current->fsuid;
+	inode->i_gid = current->fsgid;
+
+	sock->inode = inode;
+	init_waitqueue_head(&sock->wait);
+	sock->fasync_list = NULL;
+	sock->state = SS_UNCONNECTED;
+	sock->flags = 0;
+	sock->ops = NULL;
+	sock->sk = NULL;
+	sock->file = NULL;
+
+	sockets_in_use[smp_processor_id()].counter++;
+	return sock;
+}
+
+/*
+ *	In theory you can't get an open on this inode, but /proc provides
+ *	a back door. Remember to keep it shut otherwise you'll let the
+ *	creepy crawlies in.
+ */
+  
+static int sock_no_open(struct inode *irrelevant, struct file *dontcare)
+{
+	return -ENXIO;
+}
+
+/**
+ *	sock_release	-	close a socket
+ *	@sock: socket to close
+ *
+ *	The socket is released from the protocol stack if it has a release
+ *	callback, and the inode is then released if the socket is bound to
+ *	an inode not a file. 
+ */
+ 
+void sock_release(struct socket *sock)
+{
+	if (sock->ops) 
+		sock->ops->release(sock);
+
+	if (sock->fasync_list)
+		printk(KERN_ERR "sock_release: fasync list not empty!\n");
+
+	sockets_in_use[smp_processor_id()].counter--;
+	if (!sock->file) {
+		iput(sock->inode);
+		return;
+	}
+	sock->file=NULL;
+}
+
+int sock_sendmsg(struct socket *sock, struct msghdr *msg, int size)
+{
+	int err;
+	struct scm_cookie scm;
+
+	err = scm_send(sock, msg, &scm);
+	if (err >= 0) {
+		err = sock->ops->sendmsg(sock, msg, size, &scm);
+		scm_destroy(&scm);
+	}
+	return err;
+}
+
+int sock_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags)
+{
+	struct scm_cookie scm;
+
+	memset(&scm, 0, sizeof(scm));
+
+	size = sock->ops->recvmsg(sock, msg, size, flags, &scm);
+	if (size >= 0)
+		scm_recv(sock, msg, &scm, flags);
+
+	return size;
+}
+
+
+/*
+ *	Read data from a socket. ubuf is a user mode pointer. We make sure the user
+ *	area ubuf...ubuf+size-1 is writable before asking the protocol.
+ */
+
+static ssize_t sock_read(struct file *file, char *ubuf,
+			 size_t size, loff_t *ppos)
+{
+	struct socket *sock;
+	struct iovec iov;
+	struct msghdr msg;
+	int flags;
+
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+	if (size==0)		/* Match SYS5 behaviour */
+		return 0;
+
+	sock = socki_lookup(file->f_dentry->d_inode); 
+
+	msg.msg_name=NULL;
+	msg.msg_namelen=0;
+	msg.msg_iov=&iov;
+	msg.msg_iovlen=1;
+	msg.msg_control=NULL;
+	msg.msg_controllen=0;
+	iov.iov_base=ubuf;
+	iov.iov_len=size;
+	flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
+
+	return sock_recvmsg(sock, &msg, size, flags);
+}
+
+
+/*
+ *	Write data to a socket. We verify that the user area ubuf..ubuf+size-1
+ *	is readable by the user process.
+ */
+
+static ssize_t sock_write(struct file *file, const char *ubuf,
+			  size_t size, loff_t *ppos)
+{
+	struct socket *sock;
+	struct msghdr msg;
+	struct iovec iov;
+	
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+	if(size==0)		/* Match SYS5 behaviour */
+		return 0;
+
+	sock = socki_lookup(file->f_dentry->d_inode); 
+
+	msg.msg_name=NULL;
+	msg.msg_namelen=0;
+	msg.msg_iov=&iov;
+	msg.msg_iovlen=1;
+	msg.msg_control=NULL;
+	msg.msg_controllen=0;
+	msg.msg_flags=!(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
+	if (sock->type == SOCK_SEQPACKET)
+		msg.msg_flags |= MSG_EOR;
+	iov.iov_base=(void *)ubuf;
+	iov.iov_len=size;
+	
+	return sock_sendmsg(sock, &msg, size);
+}
+
+ssize_t sock_sendpage(struct file *file, struct page *page,
+		      int offset, size_t size, loff_t *ppos, int more)
+{
+	struct socket *sock;
+	int flags;
+
+	if (ppos != &file->f_pos)
+		return -ESPIPE;
+
+	sock = socki_lookup(file->f_dentry->d_inode);
+
+	flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
+	if (more)
+		flags |= MSG_MORE;
+
+	return sock->ops->sendpage(sock, page, offset, size, flags);
+}
+
+int sock_readv_writev(int type, struct inode * inode, struct file * file,
+		      const struct iovec * iov, long count, long size)
+{
+	struct msghdr msg;
+	struct socket *sock;
+
+	sock = socki_lookup(inode);
+
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_control = NULL;
+	msg.msg_controllen = 0;
+	msg.msg_iov = (struct iovec *) iov;
+	msg.msg_iovlen = count;
+	msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
+
+	/* read() does a VERIFY_WRITE */
+	if (type == VERIFY_WRITE)
+		return sock_recvmsg(sock, &msg, size, msg.msg_flags);
+
+	if (sock->type == SOCK_SEQPACKET)
+		msg.msg_flags |= MSG_EOR;
+
+	return sock_sendmsg(sock, &msg, size);
+}
+
+static ssize_t sock_readv(struct file *file, const struct iovec *vector,
+			  unsigned long count, loff_t *ppos)
+{
+	size_t tot_len = 0;
+	int i;
+        for (i = 0 ; i < count ; i++)
+                tot_len += vector[i].iov_len;
+	return sock_readv_writev(VERIFY_WRITE, file->f_dentry->d_inode,
+				 file, vector, count, tot_len);
+}
+	
+static ssize_t sock_writev(struct file *file, const struct iovec *vector,
+			   unsigned long count, loff_t *ppos)
+{
+	size_t tot_len = 0;
+	int i;
+        for (i = 0 ; i < count ; i++)
+                tot_len += vector[i].iov_len;
+	return sock_readv_writev(VERIFY_READ, file->f_dentry->d_inode,
+				 file, vector, count, tot_len);
+}
+
+/*
+ *	With an ioctl arg may well be a user mode pointer, but we don't know what to do
+ *	with it - that's up to the protocol still.
+ */
+
+int sock_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	   unsigned long arg)
+{
+	struct socket *sock;
+	int err;
+
+	unlock_kernel();
+	sock = socki_lookup(inode);
+	err = sock->ops->ioctl(sock, cmd, arg);
+	lock_kernel();
+
+	return err;
+}
+
+
+/* No kernel lock held - perfect */
+static unsigned int sock_poll(struct file *file, poll_table * wait)
+{
+	struct socket *sock;
+
+	/*
+	 *	We can't return errors to poll, so it's either yes or no. 
+	 */
+	sock = socki_lookup(file->f_dentry->d_inode);
+	return sock->ops->poll(file, sock, wait);
+}
+
+static int sock_mmap(struct file * file, struct vm_area_struct * vma)
+{
+	struct socket *sock = socki_lookup(file->f_dentry->d_inode);
+
+	return sock->ops->mmap(file, sock, vma);
+}
+
+int sock_close(struct inode *inode, struct file *filp)
+{
+	/*
+	 *	It was possible the inode is NULL we were 
+	 *	closing an unfinished socket. 
+	 */
+
+	if (!inode)
+	{
+		printk(KERN_DEBUG "sock_close: NULL inode\n");
+		return 0;
+	}
+	sock_fasync(-1, filp, 0);
+	sock_release(socki_lookup(inode));
+	return 0;
+}
+
+/*
+ *	Update the socket async list
+ *
+ *	Fasync_list locking strategy.
+ *
+ *	1. fasync_list is modified only under process context socket lock
+ *	   i.e. under semaphore.
+ *	2. fasync_list is used under read_lock(&sk->callback_lock)
+ *	   or under socket lock.
+ *	3. fasync_list can be used from softirq context, so that
+ *	   modification under socket lock have to be enhanced with
+ *	   write_lock_bh(&sk->callback_lock).
+ *							--ANK (990710)
+ */
+
+static int sock_fasync(int fd, struct file *filp, int on)
+{
+	struct fasync_struct *fa, *fna=NULL, **prev;
+	struct socket *sock;
+	struct sock *sk;
+
+	if (on)
+	{
+		fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
+		if(fna==NULL)
+			return -ENOMEM;
+	}
+
+	sock = socki_lookup(filp->f_dentry->d_inode);
+	
+	if ((sk=sock->sk) == NULL) {
+		if (fna)
+			kfree(fna);
+		return -EINVAL;
+	}
+
+	lock_sock(sk);
+
+	prev=&(sock->fasync_list);
+
+	for (fa=*prev; fa!=NULL; prev=&fa->fa_next,fa=*prev)
+		if (fa->fa_file==filp)
+			break;
+
+	if(on)
+	{
+		if(fa!=NULL)
+		{
+			write_lock_bh(&sk->callback_lock);
+			fa->fa_fd=fd;
+			write_unlock_bh(&sk->callback_lock);
+
+			kfree(fna);
+			goto out;
+		}
+		fna->fa_file=filp;
+		fna->fa_fd=fd;
+		fna->magic=FASYNC_MAGIC;
+		fna->fa_next=sock->fasync_list;
+		write_lock_bh(&sk->callback_lock);
+		sock->fasync_list=fna;
+		write_unlock_bh(&sk->callback_lock);
+	}
+	else
+	{
+		if (fa!=NULL)
+		{
+			write_lock_bh(&sk->callback_lock);
+			*prev=fa->fa_next;
+			write_unlock_bh(&sk->callback_lock);
+			kfree(fa);
+		}
+	}
+
+out:
+	release_sock(sock->sk);
+	return 0;
+}
+
+/* This function may be called only under socket lock or callback_lock */
+
+int sock_wake_async(struct socket *sock, int how, int band)
+{
+	if (!sock || !sock->fasync_list)
+		return -1;
+	switch (how)
+	{
+	case 1:
+		
+		if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags))
+			break;
+		goto call_kill;
+	case 2:
+		if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags))
+			break;
+		/* fall through */
+	case 0:
+	call_kill:
+		__kill_fasync(sock->fasync_list, SIGIO, band);
+		break;
+	case 3:
+		__kill_fasync(sock->fasync_list, SIGURG, band);
+	}
+	return 0;
+}
+
+
+int sock_create(int family, int type, int protocol, struct socket **res)
+{
+	int i;
+	struct socket *sock;
+
+	/*
+	 *	Check protocol is in range
+	 */
+	if (family < 0 || family >= NPROTO)
+		return -EAFNOSUPPORT;
+	if (type < 0 || type >= SOCK_MAX)
+		return -EINVAL;
+
+	/* Compatibility.
+
+	   This uglymoron is moved from INET layer to here to avoid
+	   deadlock in module load.
+	 */
+	if (family == PF_INET && type == SOCK_PACKET) {
+		static int warned; 
+		if (!warned) {
+			warned = 1;
+			printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", current->comm);
+		}
+		family = PF_PACKET;
+	}
+		
+#if defined(CONFIG_KMOD) && defined(CONFIG_NET)
+	/* Attempt to load a protocol module if the find failed. 
+	 * 
+	 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 
+	 * requested real, full-featured networking support upon configuration.
+	 * Otherwise module support will break!
+	 */
+	if (net_families[family]==NULL)
+	{
+		char module_name[30];
+		sprintf(module_name,"net-pf-%d",family);
+		request_module(module_name);
+	}
+#endif
+
+	net_family_read_lock();
+	if (net_families[family] == NULL) {
+		i = -EAFNOSUPPORT;
+		goto out;
+	}
+
+/*
+ *	Allocate the socket and allow the family to set things up. if
+ *	the protocol is 0, the family is instructed to select an appropriate
+ *	default.
+ */
+
+	if (!(sock = sock_alloc())) 
+	{
+		printk(KERN_WARNING "socket: no more sockets\n");
+		i = -ENFILE;		/* Not exactly a match, but its the
+					   closest posix thing */
+		goto out;
+	}
+
+	sock->type  = type;
+
+	if ((i = net_families[family]->create(sock, protocol)) < 0) 
+	{
+		sock_release(sock);
+		goto out;
+	}
+
+	*res = sock;
+
+out:
+	net_family_read_unlock();
+	return i;
+}
+
+asmlinkage long sys_socket(int family, int type, int protocol)
+{
+	int retval;
+	struct socket *sock;
+
+	retval = sock_create(family, type, protocol, &sock);
+	if (retval < 0)
+		goto out;
+
+	retval = sock_map_fd(sock);
+	if (retval < 0)
+		goto out_release;
+
+out:
+	/* It may be already another descriptor 8) Not kernel problem. */
+	return retval;
+
+out_release:
+	sock_release(sock);
+	return retval;
+}
+
+/*
+ *	Create a pair of connected sockets.
+ */
+
+asmlinkage long sys_socketpair(int family, int type, int protocol, int usockvec[2])
+{
+	struct socket *sock1, *sock2;
+	int fd1, fd2, err;
+
+	/*
+	 * Obtain the first socket and check if the underlying protocol
+	 * supports the socketpair call.
+	 */
+
+	err = sock_create(family, type, protocol, &sock1);
+	if (err < 0)
+		goto out;
+
+	err = sock_create(family, type, protocol, &sock2);
+	if (err < 0)
+		goto out_release_1;
+
+	err = sock1->ops->socketpair(sock1, sock2);
+	if (err < 0) 
+		goto out_release_both;
+
+	fd1 = fd2 = -1;
+
+	err = sock_map_fd(sock1);
+	if (err < 0)
+		goto out_release_both;
+	fd1 = err;
+
+	err = sock_map_fd(sock2);
+	if (err < 0)
+		goto out_close_1;
+	fd2 = err;
+
+	/* fd1 and fd2 may be already another descriptors.
+	 * Not kernel problem.
+	 */
+
+	err = put_user(fd1, &usockvec[0]); 
+	if (!err)
+		err = put_user(fd2, &usockvec[1]);
+	if (!err)
+		return 0;
+
+	sys_close(fd2);
+	sys_close(fd1);
+	return err;
+
+out_close_1:
+        sock_release(sock2);
+	sys_close(fd1);
+	return err;
+
+out_release_both:
+        sock_release(sock2);
+out_release_1:
+        sock_release(sock1);
+out:
+	return err;
+}
+
+
+/*
+ *	Bind a name to a socket. Nothing much to do here since it's
+ *	the protocol's responsibility to handle the local address.
+ *
+ *	We move the socket address to kernel space before we call
+ *	the protocol layer (having also checked the address is ok).
+ */
+
+asmlinkage long sys_bind(int fd, struct sockaddr *umyaddr, int addrlen)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int err;
+
+	if((sock = sockfd_lookup(fd,&err))!=NULL)
+	{
+		if((err=move_addr_to_kernel(umyaddr,addrlen,address))>=0)
+			err = sock->ops->bind(sock, (struct sockaddr *)address, addrlen);
+		sockfd_put(sock);
+	}			
+	return err;
+}
+
+
+/*
+ *	Perform a listen. Basically, we allow the protocol to do anything
+ *	necessary for a listen, and if that works, we mark the socket as
+ *	ready for listening.
+ */
+
+asmlinkage long sys_listen(int fd, int backlog)
+{
+	struct socket *sock;
+	int err;
+	
+	if ((sock = sockfd_lookup(fd, &err)) != NULL) {
+		if ((unsigned) backlog > SOMAXCONN)
+			backlog = SOMAXCONN;
+		err=sock->ops->listen(sock, backlog);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+
+/*
+ *	For accept, we attempt to create a new socket, set up the link
+ *	with the client, wake up the client, then return the new
+ *	connected fd. We collect the address of the connector in kernel
+ *	space and move it to user at the very end. This is unclean because
+ *	we open the socket then return an error.
+ *
+ *	1003.1g adds the ability to recvmsg() to query connection pending
+ *	status to recvmsg. We need to add that support in a way thats
+ *	clean when we restucture accept also.
+ */
+
+asmlinkage long sys_accept(int fd, struct sockaddr *upeer_sockaddr, int *upeer_addrlen)
+{
+	struct socket *sock, *newsock;
+	int err, len;
+	char address[MAX_SOCK_ADDR];
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+
+	err = -EMFILE;
+	if (!(newsock = sock_alloc())) 
+		goto out_put;
+
+	newsock->type = sock->type;
+	newsock->ops = sock->ops;
+
+	err = sock->ops->accept(sock, newsock, sock->file->f_flags);
+	if (err < 0)
+		goto out_release;
+
+	if (upeer_sockaddr) {
+		if(newsock->ops->getname(newsock, (struct sockaddr *)address, &len, 2)<0) {
+			err = -ECONNABORTED;
+			goto out_release;
+		}
+		err = move_addr_to_user(address, len, upeer_sockaddr, upeer_addrlen);
+		if (err < 0)
+			goto out_release;
+	}
+
+	/* File flags are not inherited via accept() unlike another OSes. */
+
+	if ((err = sock_map_fd(newsock)) < 0)
+		goto out_release;
+
+out_put:
+	sockfd_put(sock);
+out:
+	return err;
+
+out_release:
+	sock_release(newsock);
+	goto out_put;
+}
+
+
+/*
+ *	Attempt to connect to a socket with the server address.  The address
+ *	is in user space so we verify it is OK and move it to kernel space.
+ *
+ *	For 1003.1g we need to add clean support for a bind to AF_UNSPEC to
+ *	break bindings
+ *
+ *	NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and
+ *	other SEQPACKET protocols that take time to connect() as it doesn't
+ *	include the -EINPROGRESS status for such sockets.
+ */
+
+asmlinkage long sys_connect(int fd, struct sockaddr *uservaddr, int addrlen)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int err;
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+	err = move_addr_to_kernel(uservaddr, addrlen, address);
+	if (err < 0)
+		goto out_put;
+	err = sock->ops->connect(sock, (struct sockaddr *) address, addrlen,
+				 sock->file->f_flags);
+out_put:
+	sockfd_put(sock);
+out:
+	return err;
+}
+
+/*
+ *	Get the local address ('name') of a socket object. Move the obtained
+ *	name to user space.
+ */
+
+asmlinkage long sys_getsockname(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int len, err;
+	
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+	err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
+	if (err)
+		goto out_put;
+	err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
+
+out_put:
+	sockfd_put(sock);
+out:
+	return err;
+}
+
+/*
+ *	Get the remote address ('name') of a socket object. Move the obtained
+ *	name to user space.
+ */
+
+asmlinkage long sys_getpeername(int fd, struct sockaddr *usockaddr, int *usockaddr_len)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int len, err;
+
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 1);
+		if (!err)
+			err=move_addr_to_user(address,len, usockaddr, usockaddr_len);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+/*
+ *	Send a datagram to a given address. We move the address into kernel
+ *	space and check the user space data area is readable before invoking
+ *	the protocol.
+ */
+
+asmlinkage long sys_sendto(int fd, void * buff, size_t len, unsigned flags,
+			   struct sockaddr *addr, int addr_len)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int err;
+	struct msghdr msg;
+	struct iovec iov;
+	
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+	iov.iov_base=buff;
+	iov.iov_len=len;
+	msg.msg_name=NULL;
+	msg.msg_iov=&iov;
+	msg.msg_iovlen=1;
+	msg.msg_control=NULL;
+	msg.msg_controllen=0;
+	msg.msg_namelen=0;
+	if(addr)
+	{
+		err = move_addr_to_kernel(addr, addr_len, address);
+		if (err < 0)
+			goto out_put;
+		msg.msg_name=address;
+		msg.msg_namelen=addr_len;
+	}
+	if (sock->file->f_flags & O_NONBLOCK)
+		flags |= MSG_DONTWAIT;
+	msg.msg_flags = flags;
+	err = sock_sendmsg(sock, &msg, len);
+
+out_put:		
+	sockfd_put(sock);
+out:
+	return err;
+}
+
+/*
+ *	Send a datagram down a socket. 
+ */
+
+asmlinkage long sys_send(int fd, void * buff, size_t len, unsigned flags)
+{
+	return sys_sendto(fd, buff, len, flags, NULL, 0);
+}
+
+/*
+ *	Receive a frame from the socket and optionally record the address of the 
+ *	sender. We verify the buffers are writable and if needed move the
+ *	sender address from kernel to user space.
+ */
+
+asmlinkage long sys_recvfrom(int fd, void * ubuf, size_t size, unsigned flags,
+			     struct sockaddr *addr, int *addr_len)
+{
+	struct socket *sock;
+	struct iovec iov;
+	struct msghdr msg;
+	char address[MAX_SOCK_ADDR];
+	int err,err2;
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+
+	msg.msg_control=NULL;
+	msg.msg_controllen=0;
+	msg.msg_iovlen=1;
+	msg.msg_iov=&iov;
+	iov.iov_len=size;
+	iov.iov_base=ubuf;
+	msg.msg_name=address;
+	msg.msg_namelen=MAX_SOCK_ADDR;
+	if (sock->file->f_flags & O_NONBLOCK)
+		flags |= MSG_DONTWAIT;
+	err=sock_recvmsg(sock, &msg, size, flags);
+
+	if(err >= 0 && addr != NULL && msg.msg_namelen)
+	{
+		err2=move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
+		if(err2<0)
+			err=err2;
+	}
+	sockfd_put(sock);			
+out:
+	return err;
+}
+
+/*
+ *	Receive a datagram from a socket. 
+ */
+
+asmlinkage long sys_recv(int fd, void * ubuf, size_t size, unsigned flags)
+{
+	return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL);
+}
+
+/*
+ *	Set a socket option. Because we don't know the option lengths we have
+ *	to pass the user mode parameter for the protocols to sort out.
+ */
+
+asmlinkage long sys_setsockopt(int fd, int level, int optname, char *optval, int optlen)
+{
+	int err;
+	struct socket *sock;
+
+	if (optlen < 0)
+		return -EINVAL;
+			
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		if (level == SOL_SOCKET)
+			err=sock_setsockopt(sock,level,optname,optval,optlen);
+		else
+			err=sock->ops->setsockopt(sock, level, optname, optval, optlen);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+/*
+ *	Get a socket option. Because we don't know the option lengths we have
+ *	to pass a user mode parameter for the protocols to sort out.
+ */
+
+asmlinkage long sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
+{
+	int err;
+	struct socket *sock;
+
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		if (level == SOL_SOCKET)
+			err=sock_getsockopt(sock,level,optname,optval,optlen);
+		else
+			err=sock->ops->getsockopt(sock, level, optname, optval, optlen);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+
+/*
+ *	Shutdown a socket.
+ */
+
+asmlinkage long sys_shutdown(int fd, int how)
+{
+	int err;
+	struct socket *sock;
+
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		err=sock->ops->shutdown(sock, how);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+/*
+ *	BSD sendmsg interface
+ */
+
+asmlinkage long sys_sendmsg(int fd, struct msghdr *msg, unsigned flags)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
+	unsigned char ctl[sizeof(struct cmsghdr) + 20];	/* 20 is size of ipv6_pktinfo */
+	unsigned char *ctl_buf = ctl;
+	struct msghdr msg_sys;
+	int err, ctl_len, iov_size, total_len;
+	
+	err = -EFAULT;
+	if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
+		goto out; 
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock) 
+		goto out;
+
+	/* do not move before msg_sys is valid */
+	err = -EINVAL;
+	if (msg_sys.msg_iovlen > UIO_MAXIOV)
+		goto out_put;
+
+	/* Check whether to allocate the iovec area*/
+	err = -ENOMEM;
+	iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
+	if (msg_sys.msg_iovlen > UIO_FASTIOV) {
+		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
+		if (!iov)
+			goto out_put;
+	}
+
+	/* This will also move the address data into kernel space */
+	err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
+	if (err < 0) 
+		goto out_freeiov;
+	total_len = err;
+
+	err = -ENOBUFS;
+
+	if (msg_sys.msg_controllen > INT_MAX)
+		goto out_freeiov;
+	ctl_len = msg_sys.msg_controllen; 
+	if (ctl_len) 
+	{
+		if (ctl_len > sizeof(ctl))
+		{
+			ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
+			if (ctl_buf == NULL) 
+				goto out_freeiov;
+		}
+		err = -EFAULT;
+		if (copy_from_user(ctl_buf, msg_sys.msg_control, ctl_len))
+			goto out_freectl;
+		msg_sys.msg_control = ctl_buf;
+	}
+	msg_sys.msg_flags = flags;
+
+	if (sock->file->f_flags & O_NONBLOCK)
+		msg_sys.msg_flags |= MSG_DONTWAIT;
+	err = sock_sendmsg(sock, &msg_sys, total_len);
+
+out_freectl:
+	if (ctl_buf != ctl)    
+		sock_kfree_s(sock->sk, ctl_buf, ctl_len);
+out_freeiov:
+	if (iov != iovstack)
+		sock_kfree_s(sock->sk, iov, iov_size);
+out_put:
+	sockfd_put(sock);
+out:       
+	return err;
+}
+
+/*
+ *	BSD recvmsg interface
+ */
+
+asmlinkage long sys_recvmsg(int fd, struct msghdr *msg, unsigned int flags)
+{
+	struct socket *sock;
+	struct iovec iovstack[UIO_FASTIOV];
+	struct iovec *iov=iovstack;
+	struct msghdr msg_sys;
+	unsigned long cmsg_ptr;
+	int err, iov_size, total_len, len;
+
+	/* kernel mode address */
+	char addr[MAX_SOCK_ADDR];
+
+	/* user mode address pointers */
+	struct sockaddr *uaddr;
+	int *uaddr_len;
+	
+	err=-EFAULT;
+	if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
+		goto out;
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+
+	err = -EINVAL;
+	if (msg_sys.msg_iovlen > UIO_MAXIOV)
+		goto out_put;
+	
+	/* Check whether to allocate the iovec area*/
+	err = -ENOMEM;
+	iov_size = msg_sys.msg_iovlen * sizeof(struct iovec);
+	if (msg_sys.msg_iovlen > UIO_FASTIOV) {
+		iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL);
+		if (!iov)
+			goto out_put;
+	}
+
+	/*
+	 *	Save the user-mode address (verify_iovec will change the
+	 *	kernel msghdr to use the kernel address space)
+	 */
+	 
+	uaddr = msg_sys.msg_name;
+	uaddr_len = &msg->msg_namelen;
+	err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
+	if (err < 0)
+		goto out_freeiov;
+	total_len=err;
+
+	cmsg_ptr = (unsigned long)msg_sys.msg_control;
+	msg_sys.msg_flags = 0;
+	
+	if (sock->file->f_flags & O_NONBLOCK)
+		flags |= MSG_DONTWAIT;
+	err = sock_recvmsg(sock, &msg_sys, total_len, flags);
+	if (err < 0)
+		goto out_freeiov;
+	len = err;
+
+	if (uaddr != NULL && msg_sys.msg_namelen) {
+		err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, uaddr_len);
+		if (err < 0)
+			goto out_freeiov;
+	}
+	err = __put_user(msg_sys.msg_flags, &msg->msg_flags);
+	if (err)
+		goto out_freeiov;
+	err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 
+							 &msg->msg_controllen);
+	if (err)
+		goto out_freeiov;
+	err = len;
+
+out_freeiov:
+	if (iov != iovstack)
+		sock_kfree_s(sock->sk, iov, iov_size);
+out_put:
+	sockfd_put(sock);
+out:
+	return err;
+}
+
+
+/*
+ *	Perform a file control on a socket file descriptor.
+ *
+ *	Doesn't acquire a fd lock, because no network fcntl
+ *	function sleeps currently.
+ */
+
+int sock_fcntl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct socket *sock;
+
+	sock = socki_lookup (filp->f_dentry->d_inode);
+	if (sock && sock->ops)
+		return sock_no_fcntl(sock, cmd, arg);
+	return(-EINVAL);
+}
+
+/* Argument list sizes for sys_socketcall */
+#define AL(x) ((x) * sizeof(unsigned long))
+static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
+				AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
+				AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)};
+#undef AL
+
+/*
+ *	System call vectors. 
+ *
+ *	Argument checking cleaned up. Saved 20% in size.
+ *  This function doesn't need to set the kernel lock because
+ *  it is set by the callees. 
+ */
+
+asmlinkage long sys_socketcall(int call, unsigned long *args)
+{
+	unsigned long a[6];
+	unsigned long a0,a1;
+	int err;
+
+	if(call<1||call>SYS_RECVMSG)
+		return -EINVAL;
+
+	/* copy_from_user should be SMP safe. */
+	if (copy_from_user(a, args, nargs[call]))
+		return -EFAULT;
+		
+	a0=a[0];
+	a1=a[1];
+	
+	switch(call) 
+	{
+		case SYS_SOCKET:
+			err = sys_socket(a0,a1,a[2]);
+			break;
+		case SYS_BIND:
+			err = sys_bind(a0,(struct sockaddr *)a1, a[2]);
+			break;
+		case SYS_CONNECT:
+			err = sys_connect(a0, (struct sockaddr *)a1, a[2]);
+			break;
+		case SYS_LISTEN:
+			err = sys_listen(a0,a1);
+			break;
+		case SYS_ACCEPT:
+			err = sys_accept(a0,(struct sockaddr *)a1, (int *)a[2]);
+			break;
+		case SYS_GETSOCKNAME:
+			err = sys_getsockname(a0,(struct sockaddr *)a1, (int *)a[2]);
+			break;
+		case SYS_GETPEERNAME:
+			err = sys_getpeername(a0, (struct sockaddr *)a1, (int *)a[2]);
+			break;
+		case SYS_SOCKETPAIR:
+			err = sys_socketpair(a0,a1, a[2], (int *)a[3]);
+			break;
+		case SYS_SEND:
+			err = sys_send(a0, (void *)a1, a[2], a[3]);
+			break;
+		case SYS_SENDTO:
+			err = sys_sendto(a0,(void *)a1, a[2], a[3],
+					 (struct sockaddr *)a[4], a[5]);
+			break;
+		case SYS_RECV:
+			err = sys_recv(a0, (void *)a1, a[2], a[3]);
+			break;
+		case SYS_RECVFROM:
+			err = sys_recvfrom(a0, (void *)a1, a[2], a[3],
+					   (struct sockaddr *)a[4], (int *)a[5]);
+			break;
+		case SYS_SHUTDOWN:
+			err = sys_shutdown(a0,a1);
+			break;
+		case SYS_SETSOCKOPT:
+			err = sys_setsockopt(a0, a1, a[2], (char *)a[3], a[4]);
+			break;
+		case SYS_GETSOCKOPT:
+			err = sys_getsockopt(a0, a1, a[2], (char *)a[3], (int *)a[4]);
+			break;
+		case SYS_SENDMSG:
+			err = sys_sendmsg(a0, (struct msghdr *) a1, a[2]);
+			break;
+		case SYS_RECVMSG:
+			err = sys_recvmsg(a0, (struct msghdr *) a1, a[2]);
+			break;
+		default:
+			err = -EINVAL;
+			break;
+	}
+	return err;
+}
+
+/*
+ *	This function is called by a protocol handler that wants to
+ *	advertise its address family, and have it linked into the
+ *	SOCKET module.
+ */
+
+int sock_register(struct net_proto_family *ops)
+{
+	int err;
+
+	if (ops->family >= NPROTO) {
+		printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, NPROTO);
+		return -ENOBUFS;
+	}
+	net_family_write_lock();
+	err = -EEXIST;
+	if (net_families[ops->family] == NULL) {
+		net_families[ops->family]=ops;
+		err = 0;
+	}
+	net_family_write_unlock();
+	return err;
+}
+
+/*
+ *	This function is called by a protocol handler that wants to
+ *	remove its address family, and have it unlinked from the
+ *	SOCKET module.
+ */
+
+int sock_unregister(int family)
+{
+	if (family < 0 || family >= NPROTO)
+		return -1;
+
+	net_family_write_lock();
+	net_families[family]=NULL;
+	net_family_write_unlock();
+	return 0;
+}
+
+
+extern void sk_init(void);
+
+#ifdef CONFIG_WAN_ROUTER
+extern void wanrouter_init(void);
+#endif
+
+#ifdef CONFIG_BLUEZ
+extern void bluez_init(void);
+#endif
+
+void __init sock_init(void)
+{
+	int i;
+
+	printk(KERN_INFO "Linux NET4.0 for Linux 2.4\n");
+	printk(KERN_INFO "Based upon Swansea University Computer Society NET3.039\n");
+
+	/*
+	 *	Initialize all address (protocol) families. 
+	 */
+	 
+	for (i = 0; i < NPROTO; i++) 
+		net_families[i] = NULL;
+
+	/*
+	 *	Initialize sock SLAB cache.
+	 */
+	 
+	sk_init();
+
+#ifdef SLAB_SKB
+	/*
+	 *	Initialize skbuff SLAB cache 
+	 */
+	skb_init();
+#endif
+
+	/*
+	 *	Wan router layer. 
+	 */
+
+#ifdef CONFIG_WAN_ROUTER	 
+	wanrouter_init();
+#endif
+
+	/*
+	 *	Initialize the protocols module. 
+	 */
+
+	register_filesystem(&sock_fs_type);
+	sock_mnt = kern_mount(&sock_fs_type);
+	/* The real protocol initialization is performed when
+	 *  do_initcalls is run.  
+	 */
+
+
+	/*
+	 * The netlink device handler may be needed early.
+	 */
+
+#ifdef CONFIG_NET
+	rtnetlink_init();
+#endif
+#ifdef CONFIG_NETLINK_DEV
+	init_netlink();
+#endif
+#ifdef CONFIG_NETFILTER
+	netfilter_init();
+#endif
+
+#ifdef CONFIG_BLUEZ
+	bluez_init();
+#endif
+}
+
+int socket_get_info(char *buffer, char **start, off_t offset, int length)
+{
+	int len, cpu;
+	int counter = 0;
+
+	for (cpu=0; cpu<smp_num_cpus; cpu++)
+		counter += sockets_in_use[cpu_logical_map(cpu)].counter;
+
+	/* It can be negative, by the way. 8) */
+	if (counter < 0)
+		counter = 0;
+
+	len = sprintf(buffer, "sockets: used %d\n", counter);
+	if (offset >= len)
+	{
+		*start = buffer;
+		return 0;
+	}
+	*start = buffer + offset;
+	len -= offset;
+	if (len > length)
+		len = length;
+	if (len < 0)
+		len = 0;
+	return len;
+}