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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/socket.c
downloadlinux-sh-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c2088
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);