Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2088 insertions, 0 deletions

diff --git a/net/socket.c b/net/socket.c
new file mode 100644
index 000000000000..2cd44990d8d3
--- /dev/null
+++ b/net/socket.c
@@ -0,0 +1,2088 @@
+/*
+ * 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. 
+ *
+ *	Based upon Swansea University Computer Society NET3.039
+ */
+
+#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/seq_file.h>
+#include <linux/wanrouter.h>
+#include <linux/if_bridge.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/divert.h>
+#include <linux/mount.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <linux/compat.h>
+#include <linux/kmod.h>
+
+#ifdef CONFIG_NET_RADIO
+#include <linux/wireless.h>		/* Note : will define WIRELESS_EXT */
+#endif	/* CONFIG_NET_RADIO */
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+#include <net/compat.h>
+
+#include <net/sock.h>
+#include <linux/netfilter.h>
+
+static int sock_no_open(struct inode *irrelevant, struct file *dontcare);
+static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf,
+			 size_t size, loff_t pos);
+static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf,
+			  size_t size, loff_t pos);
+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 long sock_ioctl(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 = {
+	.owner =	THIS_MODULE,
+	.llseek =	no_llseek,
+	.aio_read =	sock_aio_read,
+	.aio_write =	sock_aio_write,
+	.poll =		sock_poll,
+	.unlocked_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];
+
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
+static atomic_t net_family_lockct = ATOMIC_INIT(0);
+static DEFINE_SPINLOCK(net_family_lock);
+
+/* 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 DEFINE_PER_CPU(int, sockets_in_use) = 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 __user *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 __user *uaddr, int __user *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 kmem_cache_t * sock_inode_cachep;
+
+static struct inode *sock_alloc_inode(struct super_block *sb)
+{
+	struct socket_alloc *ei;
+	ei = (struct socket_alloc *)kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL);
+	if (!ei)
+		return NULL;
+	init_waitqueue_head(&ei->socket.wait);
+	
+	ei->socket.fasync_list = NULL;
+	ei->socket.state = SS_UNCONNECTED;
+	ei->socket.flags = 0;
+	ei->socket.ops = NULL;
+	ei->socket.sk = NULL;
+	ei->socket.file = NULL;
+	ei->socket.flags = 0;
+
+	return &ei->vfs_inode;
+}
+
+static void sock_destroy_inode(struct inode *inode)
+{
+	kmem_cache_free(sock_inode_cachep,
+			container_of(inode, struct socket_alloc, vfs_inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+	struct socket_alloc *ei = (struct socket_alloc *) foo;
+
+	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+	    SLAB_CTOR_CONSTRUCTOR)
+		inode_init_once(&ei->vfs_inode);
+}
+ 
+static int init_inodecache(void)
+{
+	sock_inode_cachep = kmem_cache_create("sock_inode_cache",
+				sizeof(struct socket_alloc),
+				0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
+				init_once, NULL);
+	if (sock_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static struct super_operations sockfs_ops = {
+	.alloc_inode =	sock_alloc_inode,
+	.destroy_inode =sock_destroy_inode,
+	.statfs =	simple_statfs,
+};
+
+static struct super_block *sockfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
+}
+
+static struct vfsmount *sock_mnt;
+
+static struct file_system_type sock_fs_type = {
+	.name =		"sockfs",
+	.get_sb =	sockfs_get_sb,
+	.kill_sb =	kill_anon_super,
+};
+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 function 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 increment ref. count on file by 1.
+ *
+ *	In any case returned fd MAY BE not valid!
+ *	This race condition is unavoidable
+ *	with shared fd spaces, we cannot solve it inside kernel,
+ *	but we take care of internal coherence yet.
+ */
+
+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(sock)->i_ino);
+		this.name = name;
+		this.len = strlen(name);
+		this.hash = SOCK_INODE(sock)->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(sock));
+		file->f_vfsmnt = mntget(sock_mnt);
+		file->f_mapping = file->f_dentry->d_inode->i_mapping;
+
+		sock->file = file;
+		file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops;
+		file->f_mode = FMODE_READ | FMODE_WRITE;
+		file->f_flags = O_RDWR;
+		file->f_pos = 0;
+		fd_install(fd, file);
+	}
+
+out:
+	return fd;
+}
+
+/**
+ *	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 (!S_ISSOCK(inode->i_mode)) {
+		*err = -ENOTSOCK;
+		fput(file);
+		return NULL;
+	}
+
+	sock = SOCKET_I(inode);
+	if (sock->file != file) {
+		printk(KERN_ERR "socki_lookup: socket file changed!\n");
+		sock->file = file;
+	}
+	return sock;
+}
+
+/**
+ *	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.
+ */
+
+static struct socket *sock_alloc(void)
+{
+	struct inode * inode;
+	struct socket * sock;
+
+	inode = new_inode(sock_mnt->mnt_sb);
+	if (!inode)
+		return NULL;
+
+	sock = SOCKET_I(inode);
+
+	inode->i_mode = S_IFSOCK|S_IRWXUGO;
+	inode->i_uid = current->fsuid;
+	inode->i_gid = current->fsgid;
+
+	get_cpu_var(sockets_in_use)++;
+	put_cpu_var(sockets_in_use);
+	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;
+}
+
+struct file_operations bad_sock_fops = {
+	.owner = THIS_MODULE,
+	.open = sock_no_open,
+};
+
+/**
+ *	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) {
+		struct module *owner = sock->ops->owner;
+
+		sock->ops->release(sock);
+		sock->ops = NULL;
+		module_put(owner);
+	}
+
+	if (sock->fasync_list)
+		printk(KERN_ERR "sock_release: fasync list not empty!\n");
+
+	get_cpu_var(sockets_in_use)--;
+	put_cpu_var(sockets_in_use);
+	if (!sock->file) {
+		iput(SOCK_INODE(sock));
+		return;
+	}
+	sock->file=NULL;
+}
+
+static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 
+				 struct msghdr *msg, size_t size)
+{
+	struct sock_iocb *si = kiocb_to_siocb(iocb);
+	int err;
+
+	si->sock = sock;
+	si->scm = NULL;
+	si->msg = msg;
+	si->size = size;
+
+	err = security_socket_sendmsg(sock, msg, size);
+	if (err)
+		return err;
+
+	return sock->ops->sendmsg(iocb, sock, msg, size);
+}
+
+int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
+{
+	struct kiocb iocb;
+	struct sock_iocb siocb;
+	int ret;
+
+	init_sync_kiocb(&iocb, NULL);
+	iocb.private = &siocb;
+	ret = __sock_sendmsg(&iocb, sock, msg, size);
+	if (-EIOCBQUEUED == ret)
+		ret = wait_on_sync_kiocb(&iocb);
+	return ret;
+}
+
+int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
+		   struct kvec *vec, size_t num, size_t size)
+{
+	mm_segment_t oldfs = get_fs();
+	int result;
+
+	set_fs(KERNEL_DS);
+	/*
+	 * the following is safe, since for compiler definitions of kvec and
+	 * iovec are identical, yielding the same in-core layout and alignment
+	 */
+	msg->msg_iov = (struct iovec *)vec,
+	msg->msg_iovlen = num;
+	result = sock_sendmsg(sock, msg, size);
+	set_fs(oldfs);
+	return result;
+}
+
+static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 
+				 struct msghdr *msg, size_t size, int flags)
+{
+	int err;
+	struct sock_iocb *si = kiocb_to_siocb(iocb);
+
+	si->sock = sock;
+	si->scm = NULL;
+	si->msg = msg;
+	si->size = size;
+	si->flags = flags;
+
+	err = security_socket_recvmsg(sock, msg, size, flags);
+	if (err)
+		return err;
+
+	return sock->ops->recvmsg(iocb, sock, msg, size, flags);
+}
+
+int sock_recvmsg(struct socket *sock, struct msghdr *msg, 
+		 size_t size, int flags)
+{
+	struct kiocb iocb;
+	struct sock_iocb siocb;
+	int ret;
+
+        init_sync_kiocb(&iocb, NULL);
+	iocb.private = &siocb;
+	ret = __sock_recvmsg(&iocb, sock, msg, size, flags);
+	if (-EIOCBQUEUED == ret)
+		ret = wait_on_sync_kiocb(&iocb);
+	return ret;
+}
+
+int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 
+		   struct kvec *vec, size_t num,
+		   size_t size, int flags)
+{
+	mm_segment_t oldfs = get_fs();
+	int result;
+
+	set_fs(KERNEL_DS);
+	/*
+	 * the following is safe, since for compiler definitions of kvec and
+	 * iovec are identical, yielding the same in-core layout and alignment
+	 */
+	msg->msg_iov = (struct iovec *)vec,
+	msg->msg_iovlen = num;
+	result = sock_recvmsg(sock, msg, size, flags);
+	set_fs(oldfs);
+	return result;
+}
+
+static void sock_aio_dtor(struct kiocb *iocb)
+{
+	kfree(iocb->private);
+}
+
+/*
+ *	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_aio_read(struct kiocb *iocb, char __user *ubuf,
+			 size_t size, loff_t pos)
+{
+	struct sock_iocb *x, siocb;
+	struct socket *sock;
+	int flags;
+
+	if (pos != 0)
+		return -ESPIPE;
+	if (size==0)		/* Match SYS5 behaviour */
+		return 0;
+
+	if (is_sync_kiocb(iocb))
+		x = &siocb;
+	else {
+		x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL);
+		if (!x)
+			return -ENOMEM;
+		iocb->ki_dtor = sock_aio_dtor;
+	}
+	iocb->private = x;
+	x->kiocb = iocb;
+	sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); 
+
+	x->async_msg.msg_name = NULL;
+	x->async_msg.msg_namelen = 0;
+	x->async_msg.msg_iov = &x->async_iov;
+	x->async_msg.msg_iovlen = 1;
+	x->async_msg.msg_control = NULL;
+	x->async_msg.msg_controllen = 0;
+	x->async_iov.iov_base = ubuf;
+	x->async_iov.iov_len = size;
+	flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
+
+	return __sock_recvmsg(iocb, sock, &x->async_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_aio_write(struct kiocb *iocb, const char __user *ubuf,
+			  size_t size, loff_t pos)
+{
+	struct sock_iocb *x, siocb;
+	struct socket *sock;
+	
+	if (pos != 0)
+		return -ESPIPE;
+	if(size==0)		/* Match SYS5 behaviour */
+		return 0;
+
+	if (is_sync_kiocb(iocb))
+		x = &siocb;
+	else {
+		x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL);
+		if (!x)
+			return -ENOMEM;
+		iocb->ki_dtor = sock_aio_dtor;
+	}
+	iocb->private = x;
+	x->kiocb = iocb;
+	sock = SOCKET_I(iocb->ki_filp->f_dentry->d_inode); 
+
+	x->async_msg.msg_name = NULL;
+	x->async_msg.msg_namelen = 0;
+	x->async_msg.msg_iov = &x->async_iov;
+	x->async_msg.msg_iovlen = 1;
+	x->async_msg.msg_control = NULL;
+	x->async_msg.msg_controllen = 0;
+	x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
+	if (sock->type == SOCK_SEQPACKET)
+		x->async_msg.msg_flags |= MSG_EOR;
+	x->async_iov.iov_base = (void __user *)ubuf;
+	x->async_iov.iov_len = size;
+	
+	return __sock_sendmsg(iocb, sock, &x->async_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;
+
+	sock = SOCKET_I(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);
+}
+
+static int sock_readv_writev(int type, struct inode * inode,
+			     struct file * file, const struct iovec * iov,
+			     long count, size_t size)
+{
+	struct msghdr msg;
+	struct socket *sock;
+
+	sock = SOCKET_I(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);
+}
+
+
+/*
+ * Atomic setting of ioctl hooks to avoid race
+ * with module unload.
+ */
+
+static DECLARE_MUTEX(br_ioctl_mutex);
+static int (*br_ioctl_hook)(unsigned int cmd, void __user *arg) = NULL;
+
+void brioctl_set(int (*hook)(unsigned int, void __user *))
+{
+	down(&br_ioctl_mutex);
+	br_ioctl_hook = hook;
+	up(&br_ioctl_mutex);
+}
+EXPORT_SYMBOL(brioctl_set);
+
+static DECLARE_MUTEX(vlan_ioctl_mutex);
+static int (*vlan_ioctl_hook)(void __user *arg);
+
+void vlan_ioctl_set(int (*hook)(void __user *))
+{
+	down(&vlan_ioctl_mutex);
+	vlan_ioctl_hook = hook;
+	up(&vlan_ioctl_mutex);
+}
+EXPORT_SYMBOL(vlan_ioctl_set);
+
+static DECLARE_MUTEX(dlci_ioctl_mutex);
+static int (*dlci_ioctl_hook)(unsigned int, void __user *);
+
+void dlci_ioctl_set(int (*hook)(unsigned int, void __user *))
+{
+	down(&dlci_ioctl_mutex);
+	dlci_ioctl_hook = hook;
+	up(&dlci_ioctl_mutex);
+}
+EXPORT_SYMBOL(dlci_ioctl_set);
+
+/*
+ *	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.
+ */
+
+static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+	struct socket *sock;
+	void __user *argp = (void __user *)arg;
+	int pid, err;
+
+	sock = SOCKET_I(file->f_dentry->d_inode);
+	if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
+		err = dev_ioctl(cmd, argp);
+	} else
+#ifdef WIRELESS_EXT
+	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
+		err = dev_ioctl(cmd, argp);
+	} else
+#endif	/* WIRELESS_EXT */
+	switch (cmd) {
+		case FIOSETOWN:
+		case SIOCSPGRP:
+			err = -EFAULT;
+			if (get_user(pid, (int __user *)argp))
+				break;
+			err = f_setown(sock->file, pid, 1);
+			break;
+		case FIOGETOWN:
+		case SIOCGPGRP:
+			err = put_user(sock->file->f_owner.pid, (int __user *)argp);
+			break;
+		case SIOCGIFBR:
+		case SIOCSIFBR:
+		case SIOCBRADDBR:
+		case SIOCBRDELBR:
+			err = -ENOPKG;
+			if (!br_ioctl_hook)
+				request_module("bridge");
+
+			down(&br_ioctl_mutex);
+			if (br_ioctl_hook) 
+				err = br_ioctl_hook(cmd, argp);
+			up(&br_ioctl_mutex);
+			break;
+		case SIOCGIFVLAN:
+		case SIOCSIFVLAN:
+			err = -ENOPKG;
+			if (!vlan_ioctl_hook)
+				request_module("8021q");
+
+			down(&vlan_ioctl_mutex);
+			if (vlan_ioctl_hook)
+				err = vlan_ioctl_hook(argp);
+			up(&vlan_ioctl_mutex);
+			break;
+		case SIOCGIFDIVERT:
+		case SIOCSIFDIVERT:
+		/* Convert this to call through a hook */
+			err = divert_ioctl(cmd, argp);
+			break;
+		case SIOCADDDLCI:
+		case SIOCDELDLCI:
+			err = -ENOPKG;
+			if (!dlci_ioctl_hook)
+				request_module("dlci");
+
+			if (dlci_ioctl_hook) {
+				down(&dlci_ioctl_mutex);
+				err = dlci_ioctl_hook(cmd, argp);
+				up(&dlci_ioctl_mutex);
+			}
+			break;
+		default:
+			err = sock->ops->ioctl(sock, cmd, arg);
+			break;
+	}
+	return err;
+}
+
+int sock_create_lite(int family, int type, int protocol, struct socket **res)
+{
+	int err;
+	struct socket *sock = NULL;
+	
+	err = security_socket_create(family, type, protocol, 1);
+	if (err)
+		goto out;
+
+	sock = sock_alloc();
+	if (!sock) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	security_socket_post_create(sock, family, type, protocol, 1);
+	sock->type = type;
+out:
+	*res = sock;
+	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 = SOCKET_I(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 = SOCKET_I(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(SOCKET_I(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->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->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 = SOCKET_I(filp->f_dentry->d_inode);
+
+	if ((sk=sock->sk) == NULL) {
+		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->sk_callback_lock);
+			fa->fa_fd=fd;
+			write_unlock_bh(&sk->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->sk_callback_lock);
+		sock->fasync_list=fna;
+		write_unlock_bh(&sk->sk_callback_lock);
+	}
+	else
+	{
+		if (fa!=NULL)
+		{
+			write_lock_bh(&sk->sk_callback_lock);
+			*prev=fa->fa_next;
+			write_unlock_bh(&sk->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;
+}
+
+static int __sock_create(int family, int type, int protocol, struct socket **res, int kern)
+{
+	int err;
+	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;
+	}
+
+	err = security_socket_create(family, type, protocol, kern);
+	if (err)
+		return err;
+		
+#if defined(CONFIG_KMOD)
+	/* 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)
+	{
+		request_module("net-pf-%d",family);
+	}
+#endif
+
+	net_family_read_lock();
+	if (net_families[family] == NULL) {
+		err = -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");
+		err = -ENFILE;		/* Not exactly a match, but its the
+					   closest posix thing */
+		goto out;
+	}
+
+	sock->type  = type;
+
+	/*
+	 * We will call the ->create function, that possibly is in a loadable
+	 * module, so we have to bump that loadable module refcnt first.
+	 */
+	err = -EAFNOSUPPORT;
+	if (!try_module_get(net_families[family]->owner))
+		goto out_release;
+
+	if ((err = net_families[family]->create(sock, protocol)) < 0)
+		goto out_module_put;
+	/*
+	 * Now to bump the refcnt of the [loadable] module that owns this
+	 * socket at sock_release time we decrement its refcnt.
+	 */
+	if (!try_module_get(sock->ops->owner)) {
+		sock->ops = NULL;
+		goto out_module_put;
+	}
+	/*
+	 * Now that we're done with the ->create function, the [loadable]
+	 * module can have its refcnt decremented
+	 */
+	module_put(net_families[family]->owner);
+	*res = sock;
+	security_socket_post_create(sock, family, type, protocol, kern);
+
+out:
+	net_family_read_unlock();
+	return err;
+out_module_put:
+	module_put(net_families[family]->owner);
+out_release:
+	sock_release(sock);
+	goto out;
+}
+
+int sock_create(int family, int type, int protocol, struct socket **res)
+{
+	return __sock_create(family, type, protocol, res, 0);
+}
+
+int sock_create_kern(int family, int type, int protocol, struct socket **res)
+{
+	return __sock_create(family, type, protocol, res, 1);
+}
+
+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 __user *usockvec)
+{
+	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 __user *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 = security_socket_bind(sock, (struct sockaddr *)address, addrlen);
+			if (err) {
+				sockfd_put(sock);
+				return err;
+			}
+			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.
+ */
+
+int sysctl_somaxconn = SOMAXCONN;
+
+asmlinkage long sys_listen(int fd, int backlog)
+{
+	struct socket *sock;
+	int err;
+	
+	if ((sock = sockfd_lookup(fd, &err)) != NULL) {
+		if ((unsigned) backlog > sysctl_somaxconn)
+			backlog = sysctl_somaxconn;
+
+		err = security_socket_listen(sock, backlog);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+
+		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 __user *upeer_sockaddr, int __user *upeer_addrlen)
+{
+	struct socket *sock, *newsock;
+	int err, len;
+	char address[MAX_SOCK_ADDR];
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+
+	err = -ENFILE;
+	if (!(newsock = sock_alloc())) 
+		goto out_put;
+
+	newsock->type = sock->type;
+	newsock->ops = sock->ops;
+
+	err = security_socket_accept(sock, newsock);
+	if (err)
+		goto out_release;
+
+	/*
+	 * We don't need try_module_get here, as the listening socket (sock)
+	 * has the protocol module (sock->ops->owner) held.
+	 */
+	__module_get(newsock->ops->owner);
+
+	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;
+
+	security_socket_post_accept(sock, newsock);
+
+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 __user *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 = security_socket_connect(sock, (struct sockaddr *)address, addrlen);
+	if (err)
+		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 __user *usockaddr, int __user *usockaddr_len)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int len, err;
+	
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+
+	err = security_socket_getsockname(sock);
+	if (err)
+		goto out_put;
+
+	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 __user *usockaddr, int __user *usockaddr_len)
+{
+	struct socket *sock;
+	char address[MAX_SOCK_ADDR];
+	int len, err;
+
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		err = security_socket_getpeername(sock);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+
+		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 __user * buff, size_t len, unsigned flags,
+			   struct sockaddr __user *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 __user * 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 __user * ubuf, size_t size, unsigned flags,
+			     struct sockaddr __user *addr, int __user *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)
+	{
+		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 __user * 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 __user *optval, int optlen)
+{
+	int err;
+	struct socket *sock;
+
+	if (optlen < 0)
+		return -EINVAL;
+			
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		err = security_socket_setsockopt(sock,level,optname);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+
+		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 __user *optval, int __user *optlen)
+{
+	int err;
+	struct socket *sock;
+
+	if ((sock = sockfd_lookup(fd, &err))!=NULL)
+	{
+		err = security_socket_getsockopt(sock, level, 
+							   optname);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+
+		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 = security_socket_shutdown(sock, how);
+		if (err) {
+			sockfd_put(sock);
+			return err;
+		}
+				
+		err=sock->ops->shutdown(sock, how);
+		sockfd_put(sock);
+	}
+	return err;
+}
+
+/* A couple of helpful macros for getting the address of the 32/64 bit 
+ * fields which are the same type (int / unsigned) on our platforms.
+ */
+#define COMPAT_MSG(msg, member)	((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member)
+#define COMPAT_NAMELEN(msg)	COMPAT_MSG(msg, msg_namelen)
+#define COMPAT_FLAGS(msg)	COMPAT_MSG(msg, msg_flags)
+
+
+/*
+ *	BSD sendmsg interface
+ */
+
+asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
+{
+	struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
+	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 (MSG_CMSG_COMPAT & flags) {
+		if (get_compat_msghdr(&msg_sys, msg_compat))
+			return -EFAULT;
+	} else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr)))
+		return -EFAULT;
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock) 
+		goto out;
+
+	/* do not move before msg_sys is valid */
+	err = -EMSGSIZE;
+	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 */
+	if (MSG_CMSG_COMPAT & flags) {
+		err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
+	} else
+		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 ((MSG_CMSG_COMPAT & flags) && ctl_len) {
+		err = cmsghdr_from_user_compat_to_kern(&msg_sys, ctl, sizeof(ctl));
+		if (err)
+			goto out_freeiov;
+		ctl_buf = msg_sys.msg_control;
+	} else 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;
+		/*
+		 * Careful! Before this, msg_sys.msg_control contains a user pointer.
+		 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted
+		 * checking falls down on this.
+		 */
+		if (copy_from_user(ctl_buf, (void __user *) 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 __user *msg, unsigned int flags)
+{
+	struct compat_msghdr __user *msg_compat = (struct compat_msghdr __user *)msg;
+	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 __user *uaddr;
+	int __user *uaddr_len;
+	
+	if (MSG_CMSG_COMPAT & flags) {
+		if (get_compat_msghdr(&msg_sys, msg_compat))
+			return -EFAULT;
+	} else
+		if (copy_from_user(&msg_sys,msg,sizeof(struct msghdr)))
+			return -EFAULT;
+
+	sock = sockfd_lookup(fd, &err);
+	if (!sock)
+		goto out;
+
+	err = -EMSGSIZE;
+	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 = (void __user *) msg_sys.msg_name;
+	uaddr_len = COMPAT_NAMELEN(msg);
+	if (MSG_CMSG_COMPAT & flags) {
+		err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
+	} else
+		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 (MSG_CMSG_COMPAT & flags)
+		msg_sys.msg_flags = MSG_CMSG_COMPAT;
+	
+	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) {
+		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, COMPAT_FLAGS(msg));
+	if (err)
+		goto out_freeiov;
+	if (MSG_CMSG_COMPAT & flags)
+		err = __put_user((unsigned long)msg_sys.msg_control-cmsg_ptr, 
+				 &msg_compat->msg_controllen);
+	else
+		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;
+}
+
+#ifdef __ARCH_WANT_SYS_SOCKETCALL
+
+/* 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 __user *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 __user *)a1, a[2]);
+			break;
+		case SYS_CONNECT:
+			err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
+			break;
+		case SYS_LISTEN:
+			err = sys_listen(a0,a1);
+			break;
+		case SYS_ACCEPT:
+			err = sys_accept(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
+			break;
+		case SYS_GETSOCKNAME:
+			err = sys_getsockname(a0,(struct sockaddr __user *)a1, (int __user *)a[2]);
+			break;
+		case SYS_GETPEERNAME:
+			err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]);
+			break;
+		case SYS_SOCKETPAIR:
+			err = sys_socketpair(a0,a1, a[2], (int __user *)a[3]);
+			break;
+		case SYS_SEND:
+			err = sys_send(a0, (void __user *)a1, a[2], a[3]);
+			break;
+		case SYS_SENDTO:
+			err = sys_sendto(a0,(void __user *)a1, a[2], a[3],
+					 (struct sockaddr __user *)a[4], a[5]);
+			break;
+		case SYS_RECV:
+			err = sys_recv(a0, (void __user *)a1, a[2], a[3]);
+			break;
+		case SYS_RECVFROM:
+			err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3],
+					   (struct sockaddr __user *)a[4], (int __user *)a[5]);
+			break;
+		case SYS_SHUTDOWN:
+			err = sys_shutdown(a0,a1);
+			break;
+		case SYS_SETSOCKOPT:
+			err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]);
+			break;
+		case SYS_GETSOCKOPT:
+			err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]);
+			break;
+		case SYS_SENDMSG:
+			err = sys_sendmsg(a0, (struct msghdr __user *) a1, a[2]);
+			break;
+		case SYS_RECVMSG:
+			err = sys_recvmsg(a0, (struct msghdr __user *) a1, a[2]);
+			break;
+		default:
+			err = -EINVAL;
+			break;
+	}
+	return err;
+}
+
+#endif /* __ARCH_WANT_SYS_SOCKETCALL */
+
+/*
+ *	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();
+	printk(KERN_INFO "NET: Registered protocol family %d\n",
+	       ops->family);
+	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();
+	printk(KERN_INFO "NET: Unregistered protocol family %d\n",
+	       family);
+	return 0;
+}
+
+
+extern void sk_init(void);
+
+void __init sock_init(void)
+{
+	/*
+	 *	Initialize sock SLAB cache.
+	 */
+	 
+	sk_init();
+
+#ifdef SLAB_SKB
+	/*
+	 *	Initialize skbuff SLAB cache 
+	 */
+	skb_init();
+#endif
+
+	/*
+	 *	Initialize the protocols module. 
+	 */
+
+	init_inodecache();
+	register_filesystem(&sock_fs_type);
+	sock_mnt = kern_mount(&sock_fs_type);
+	/* The real protocol initialization is performed when
+	 *  do_initcalls is run.  
+	 */
+
+#ifdef CONFIG_NETFILTER
+	netfilter_init();
+#endif
+}
+
+#ifdef CONFIG_PROC_FS
+void socket_seq_show(struct seq_file *seq)
+{
+	int cpu;
+	int counter = 0;
+
+	for (cpu = 0; cpu < NR_CPUS; cpu++)
+		counter += per_cpu(sockets_in_use, cpu);
+
+	/* It can be negative, by the way. 8) */
+	if (counter < 0)
+		counter = 0;
+
+	seq_printf(seq, "sockets: used %d\n", counter);
+}
+#endif /* CONFIG_PROC_FS */
+
+/* ABI emulation layers need these two */
+EXPORT_SYMBOL(move_addr_to_kernel);
+EXPORT_SYMBOL(move_addr_to_user);
+EXPORT_SYMBOL(sock_create);
+EXPORT_SYMBOL(sock_create_kern);
+EXPORT_SYMBOL(sock_create_lite);
+EXPORT_SYMBOL(sock_map_fd);
+EXPORT_SYMBOL(sock_recvmsg);
+EXPORT_SYMBOL(sock_register);
+EXPORT_SYMBOL(sock_release);
+EXPORT_SYMBOL(sock_sendmsg);
+EXPORT_SYMBOL(sock_unregister);
+EXPORT_SYMBOL(sock_wake_async);
+EXPORT_SYMBOL(sockfd_lookup);
+EXPORT_SYMBOL(kernel_sendmsg);
+EXPORT_SYMBOL(kernel_recvmsg);